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freebsd-skq/sys/contrib/x86emu/x86emu.c

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/* $OpenBSD: x86emu.c,v 1.9 2014/06/15 11:04:49 pirofti Exp $ */
/* $NetBSD: x86emu.c,v 1.7 2009/02/03 19:26:29 joerg Exp $ */
/*
*
* Realmode X86 Emulator Library
*
* Copyright (C) 1996-1999 SciTech Software, Inc.
* Copyright (C) David Mosberger-Tang
* Copyright (C) 1999 Egbert Eich
* Copyright (C) 2007 Joerg Sonnenberger
*
* ========================================================================
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of the authors not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. The authors makes no
* representations about the suitability of this software for any purpose.
* It is provided "as is" without express or implied warranty.
*
* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <contrib/x86emu/x86emu.h>
#include <contrib/x86emu/x86emu_regs.h>
static void x86emu_intr_raise (struct x86emu *, uint8_t type);
static void x86emu_exec_one_byte(struct x86emu *);
static void x86emu_exec_two_byte(struct x86emu *);
static void fetch_decode_modrm (struct x86emu *);
static uint8_t fetch_byte_imm (struct x86emu *);
static uint16_t fetch_word_imm (struct x86emu *);
static uint32_t fetch_long_imm (struct x86emu *);
static uint8_t fetch_data_byte (struct x86emu *, uint32_t offset);
static uint8_t fetch_byte (struct x86emu *, u_int segment, uint32_t offset);
static uint16_t fetch_data_word (struct x86emu *, uint32_t offset);
static uint16_t fetch_word (struct x86emu *, uint32_t segment, uint32_t offset);
static uint32_t fetch_data_long (struct x86emu *, uint32_t offset);
static uint32_t fetch_long (struct x86emu *, uint32_t segment, uint32_t offset);
static void store_data_byte (struct x86emu *, uint32_t offset, uint8_t val);
static void store_byte (struct x86emu *, uint32_t segment, uint32_t offset, uint8_t val);
static void store_data_word (struct x86emu *, uint32_t offset, uint16_t val);
static void store_word (struct x86emu *, uint32_t segment, uint32_t offset, uint16_t val);
static void store_data_long (struct x86emu *, uint32_t offset, uint32_t val);
static void store_long (struct x86emu *, uint32_t segment, uint32_t offset, uint32_t val);
static uint8_t* decode_rl_byte_register(struct x86emu *);
static uint16_t* decode_rl_word_register(struct x86emu *);
static uint32_t* decode_rl_long_register(struct x86emu *);
static uint8_t* decode_rh_byte_register(struct x86emu *);
static uint16_t* decode_rh_word_register(struct x86emu *);
static uint32_t* decode_rh_long_register(struct x86emu *);
static uint16_t* decode_rh_seg_register(struct x86emu *);
static uint32_t decode_rl_address(struct x86emu *);
static uint8_t decode_and_fetch_byte(struct x86emu *);
static uint16_t decode_and_fetch_word(struct x86emu *);
static uint32_t decode_and_fetch_long(struct x86emu *);
static uint8_t decode_and_fetch_byte_imm8(struct x86emu *, uint8_t *);
static uint16_t decode_and_fetch_word_imm8(struct x86emu *, uint8_t *);
static uint32_t decode_and_fetch_long_imm8(struct x86emu *, uint8_t *);
static uint16_t decode_and_fetch_word_disp(struct x86emu *, int16_t);
static uint32_t decode_and_fetch_long_disp(struct x86emu *, int16_t);
static void write_back_byte(struct x86emu *, uint8_t);
static void write_back_word(struct x86emu *, uint16_t);
static void write_back_long(struct x86emu *, uint32_t);
static uint16_t aaa_word (struct x86emu *, uint16_t d);
static uint16_t aas_word (struct x86emu *, uint16_t d);
static uint16_t aad_word (struct x86emu *, uint16_t d);
static uint16_t aam_word (struct x86emu *, uint8_t d);
static uint8_t adc_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t adc_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t adc_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t add_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t add_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t add_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t and_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t and_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t and_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t cmp_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t cmp_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t cmp_long (struct x86emu *, uint32_t d, uint32_t s);
static void cmp_byte_no_return (struct x86emu *, uint8_t d, uint8_t s);
static void cmp_word_no_return (struct x86emu *, uint16_t d, uint16_t s);
static void cmp_long_no_return (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t daa_byte (struct x86emu *, uint8_t d);
static uint8_t das_byte (struct x86emu *, uint8_t d);
static uint8_t dec_byte (struct x86emu *, uint8_t d);
static uint16_t dec_word (struct x86emu *, uint16_t d);
static uint32_t dec_long (struct x86emu *, uint32_t d);
static uint8_t inc_byte (struct x86emu *, uint8_t d);
static uint16_t inc_word (struct x86emu *, uint16_t d);
static uint32_t inc_long (struct x86emu *, uint32_t d);
static uint8_t or_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t or_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t or_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t neg_byte (struct x86emu *, uint8_t s);
static uint16_t neg_word (struct x86emu *, uint16_t s);
static uint32_t neg_long (struct x86emu *, uint32_t s);
static uint8_t rcl_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t rcl_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t rcl_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t rcr_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t rcr_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t rcr_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t rol_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t rol_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t rol_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t ror_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t ror_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t ror_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t shl_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t shl_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t shl_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t shr_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t shr_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t shr_long (struct x86emu *, uint32_t d, uint8_t s);
static uint8_t sar_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t sar_word (struct x86emu *, uint16_t d, uint8_t s);
static uint32_t sar_long (struct x86emu *, uint32_t d, uint8_t s);
static uint16_t shld_word (struct x86emu *, uint16_t d, uint16_t fill, uint8_t s);
static uint32_t shld_long (struct x86emu *, uint32_t d, uint32_t fill, uint8_t s);
static uint16_t shrd_word (struct x86emu *, uint16_t d, uint16_t fill, uint8_t s);
static uint32_t shrd_long (struct x86emu *, uint32_t d, uint32_t fill, uint8_t s);
static uint8_t sbb_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t sbb_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t sbb_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t sub_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t sub_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t sub_long (struct x86emu *, uint32_t d, uint32_t s);
static void test_byte (struct x86emu *, uint8_t d, uint8_t s);
static void test_word (struct x86emu *, uint16_t d, uint16_t s);
static void test_long (struct x86emu *, uint32_t d, uint32_t s);
static uint8_t xor_byte (struct x86emu *, uint8_t d, uint8_t s);
static uint16_t xor_word (struct x86emu *, uint16_t d, uint16_t s);
static uint32_t xor_long (struct x86emu *, uint32_t d, uint32_t s);
static void imul_byte (struct x86emu *, uint8_t s);
static void imul_word (struct x86emu *, uint16_t s);
static void imul_long (struct x86emu *, uint32_t s);
static void mul_byte (struct x86emu *, uint8_t s);
static void mul_word (struct x86emu *, uint16_t s);
static void mul_long (struct x86emu *, uint32_t s);
static void idiv_byte (struct x86emu *, uint8_t s);
static void idiv_word (struct x86emu *, uint16_t s);
static void idiv_long (struct x86emu *, uint32_t s);
static void div_byte (struct x86emu *, uint8_t s);
static void div_word (struct x86emu *, uint16_t s);
static void div_long (struct x86emu *, uint32_t s);
static void ins (struct x86emu *, int size);
static void outs (struct x86emu *, int size);
static void push_word (struct x86emu *, uint16_t w);
static void push_long (struct x86emu *, uint32_t w);
static uint16_t pop_word (struct x86emu *);
static uint32_t pop_long (struct x86emu *);
/*
* REMARKS:
* Handles any pending asychronous interrupts.
*/
static void
x86emu_intr_dispatch(struct x86emu *emu, uint8_t intno)
{
if (emu->_x86emu_intrTab[intno]) {
(*emu->_x86emu_intrTab[intno]) (emu, intno);
} else {
push_word(emu, (uint16_t) emu->x86.R_FLG);
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_TF);
push_word(emu, emu->x86.R_CS);
emu->x86.R_CS = fetch_word(emu, 0, intno * 4 + 2);
push_word(emu, emu->x86.R_IP);
emu->x86.R_IP = fetch_word(emu, 0, intno * 4);
}
}
static void
x86emu_intr_handle(struct x86emu *emu)
{
uint8_t intno;
if (emu->x86.intr & INTR_SYNCH) {
intno = emu->x86.intno;
emu->x86.intr = 0;
x86emu_intr_dispatch(emu, intno);
}
}
/*
* PARAMETERS:
* intrnum - Interrupt number to raise
*
* REMARKS:
* Raise the specified interrupt to be handled before the execution of the
* next instruction.
*/
void
x86emu_intr_raise(struct x86emu *emu, uint8_t intrnum)
{
emu->x86.intno = intrnum;
emu->x86.intr |= INTR_SYNCH;
}
/*
* REMARKS:
* Main execution loop for the emulator. We return from here when the system
* halts, which is normally caused by a stack fault when we return from the
* original real mode call.
*/
void
x86emu_exec(struct x86emu *emu)
{
emu->x86.intr = 0;
if (setjmp(emu->exec_state))
return;
for (;;) {
if (emu->x86.intr) {
if (((emu->x86.intr & INTR_SYNCH) &&
(emu->x86.intno == 0 || emu->x86.intno == 2)) ||
!ACCESS_FLAG(F_IF)) {
x86emu_intr_handle(emu);
}
}
if (emu->x86.R_CS == 0 && emu->x86.R_IP == 0)
return;
x86emu_exec_one_byte(emu);
++emu->cur_cycles;
}
}
void
x86emu_exec_call(struct x86emu *emu, uint16_t seg, uint16_t off)
{
push_word(emu, 0);
push_word(emu, 0);
emu->x86.R_CS = seg;
emu->x86.R_IP = off;
x86emu_exec(emu);
}
void
x86emu_exec_intr(struct x86emu *emu, uint8_t intr)
{
push_word(emu, emu->x86.R_FLG);
CLEAR_FLAG(F_IF);
CLEAR_FLAG(F_TF);
push_word(emu, 0);
push_word(emu, 0);
emu->x86.R_CS = (*emu->emu_rdw)(emu, intr * 4 + 2);
emu->x86.R_IP = (*emu->emu_rdw)(emu, intr * 4);
emu->x86.intr = 0;
x86emu_exec(emu);
}
/*
* REMARKS:
* Halts the system by setting the halted system flag.
*/
void
x86emu_halt_sys(struct x86emu *emu)
{
longjmp(emu->exec_state, 1);
}
/*
* PARAMETERS:
* mod - Mod value from decoded byte
* regh - Reg h value from decoded byte
* regl - Reg l value from decoded byte
*
* REMARKS:
* Raise the specified interrupt to be handled before the execution of the
* next instruction.
*
* NOTE: Do not inline this function, as (*emu->emu_rdb) is already inline!
*/
static void
fetch_decode_modrm(struct x86emu *emu)
{
int fetched;
fetched = fetch_byte_imm(emu);
emu->cur_mod = (fetched >> 6) & 0x03;
emu->cur_rh = (fetched >> 3) & 0x07;
emu->cur_rl = (fetched >> 0) & 0x07;
}
/*
* RETURNS:
* Immediate byte value read from instruction queue
*
* REMARKS:
* This function returns the immediate byte from the instruction queue, and
* moves the instruction pointer to the next value.
*
* NOTE: Do not inline this function, as (*emu->emu_rdb) is already inline!
*/
static uint8_t
fetch_byte_imm(struct x86emu *emu)
{
uint8_t fetched;
fetched = fetch_byte(emu, emu->x86.R_CS, emu->x86.R_IP);
emu->x86.R_IP++;
return fetched;
}
/*
* RETURNS:
* Immediate word value read from instruction queue
*
* REMARKS:
* This function returns the immediate byte from the instruction queue, and
* moves the instruction pointer to the next value.
*
* NOTE: Do not inline this function, as (*emu->emu_rdw) is already inline!
*/
static uint16_t
fetch_word_imm(struct x86emu *emu)
{
uint16_t fetched;
fetched = fetch_word(emu, emu->x86.R_CS, emu->x86.R_IP);
emu->x86.R_IP += 2;
return fetched;
}
/*
* RETURNS:
* Immediate lone value read from instruction queue
*
* REMARKS:
* This function returns the immediate byte from the instruction queue, and
* moves the instruction pointer to the next value.
*
* NOTE: Do not inline this function, as (*emu->emu_rdw) is already inline!
*/
static uint32_t
fetch_long_imm(struct x86emu *emu)
{
uint32_t fetched;
fetched = fetch_long(emu, emu->x86.R_CS, emu->x86.R_IP);
emu->x86.R_IP += 4;
return fetched;
}
/*
* RETURNS:
* Value of the default data segment
*
* REMARKS:
* Inline function that returns the default data segment for the current
* instruction.
*
* On the x86 processor, the default segment is not always DS if there is
* no segment override. Address modes such as -3[BP] or 10[BP+SI] all refer to
* addresses relative to SS (ie: on the stack). So, at the minimum, all
* decodings of addressing modes would have to set/clear a bit describing
* whether the access is relative to DS or SS. That is the function of the
* cpu-state-varible emu->x86.mode. There are several potential states:
*
* repe prefix seen (handled elsewhere)
* repne prefix seen (ditto)
*
* cs segment override
* ds segment override
* es segment override
* fs segment override
* gs segment override
* ss segment override
*
* ds/ss select (in absense of override)
*
* Each of the above 7 items are handled with a bit in the mode field.
*/
static uint32_t
get_data_segment(struct x86emu *emu)
{
switch (emu->x86.mode & SYSMODE_SEGMASK) {
case 0: /* default case: use ds register */
case SYSMODE_SEGOVR_DS:
case SYSMODE_SEGOVR_DS | SYSMODE_SEG_DS_SS:
return emu->x86.R_DS;
case SYSMODE_SEG_DS_SS:/* non-overridden, use ss register */
return emu->x86.R_SS;
case SYSMODE_SEGOVR_CS:
case SYSMODE_SEGOVR_CS | SYSMODE_SEG_DS_SS:
return emu->x86.R_CS;
case SYSMODE_SEGOVR_ES:
case SYSMODE_SEGOVR_ES | SYSMODE_SEG_DS_SS:
return emu->x86.R_ES;
case SYSMODE_SEGOVR_FS:
case SYSMODE_SEGOVR_FS | SYSMODE_SEG_DS_SS:
return emu->x86.R_FS;
case SYSMODE_SEGOVR_GS:
case SYSMODE_SEGOVR_GS | SYSMODE_SEG_DS_SS:
return emu->x86.R_GS;
case SYSMODE_SEGOVR_SS:
case SYSMODE_SEGOVR_SS | SYSMODE_SEG_DS_SS:
return emu->x86.R_SS;
}
x86emu_halt_sys(emu);
}
/*
* PARAMETERS:
* offset - Offset to load data from
*
* RETURNS:
* Byte value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint8_t
fetch_data_byte(struct x86emu *emu, uint32_t offset)
{
return fetch_byte(emu, get_data_segment(emu), offset);
}
/*
* PARAMETERS:
* offset - Offset to load data from
*
* RETURNS:
* Word value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint16_t
fetch_data_word(struct x86emu *emu, uint32_t offset)
{
return fetch_word(emu, get_data_segment(emu), offset);
}
/*
* PARAMETERS:
* offset - Offset to load data from
*
* RETURNS:
* Long value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint32_t
fetch_data_long(struct x86emu *emu, uint32_t offset)
{
return fetch_long(emu, get_data_segment(emu), offset);
}
/*
* PARAMETERS:
* segment - Segment to load data from
* offset - Offset to load data from
*
* RETURNS:
* Byte value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint8_t
fetch_byte(struct x86emu *emu, uint32_t segment, uint32_t offset)
{
return (*emu->emu_rdb) (emu, ((uint32_t) segment << 4) + offset);
}
/*
* PARAMETERS:
* segment - Segment to load data from
* offset - Offset to load data from
*
* RETURNS:
* Word value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint16_t
fetch_word(struct x86emu *emu, uint32_t segment, uint32_t offset)
{
return (*emu->emu_rdw) (emu, ((uint32_t) segment << 4) + offset);
}
/*
* PARAMETERS:
* segment - Segment to load data from
* offset - Offset to load data from
*
* RETURNS:
* Long value read from the absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_rdX) is already inline!
*/
static uint32_t
fetch_long(struct x86emu *emu, uint32_t segment, uint32_t offset)
{
return (*emu->emu_rdl) (emu, ((uint32_t) segment << 4) + offset);
}
/*
* PARAMETERS:
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a word value to an segmented memory location. The segment used is
* the current 'default' segment, which may have been overridden.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_data_byte(struct x86emu *emu, uint32_t offset, uint8_t val)
{
store_byte(emu, get_data_segment(emu), offset, val);
}
/*
* PARAMETERS:
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a word value to an segmented memory location. The segment used is
* the current 'default' segment, which may have been overridden.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_data_word(struct x86emu *emu, uint32_t offset, uint16_t val)
{
store_word(emu, get_data_segment(emu), offset, val);
}
/*
* PARAMETERS:
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a long value to an segmented memory location. The segment used is
* the current 'default' segment, which may have been overridden.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_data_long(struct x86emu *emu, uint32_t offset, uint32_t val)
{
store_long(emu, get_data_segment(emu), offset, val);
}
/*
* PARAMETERS:
* segment - Segment to store data at
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a byte value to an absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_byte(struct x86emu *emu, uint32_t segment, uint32_t offset, uint8_t val)
{
(*emu->emu_wrb) (emu, ((uint32_t) segment << 4) + offset, val);
}
/*
* PARAMETERS:
* segment - Segment to store data at
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a word value to an absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_word(struct x86emu *emu, uint32_t segment, uint32_t offset, uint16_t val)
{
(*emu->emu_wrw) (emu, ((uint32_t) segment << 4) + offset, val);
}
/*
* PARAMETERS:
* segment - Segment to store data at
* offset - Offset to store data at
* val - Value to store
*
* REMARKS:
* Writes a long value to an absolute memory location.
*
* NOTE: Do not inline this function as (*emu->emu_wrX) is already inline!
*/
static void
store_long(struct x86emu *emu, uint32_t segment, uint32_t offset, uint32_t val)
{
(*emu->emu_wrl) (emu, ((uint32_t) segment << 4) + offset, val);
}
/*
* PARAMETERS:
* reg - Register to decode
*
* RETURNS:
* Pointer to the appropriate register
*
* REMARKS:
* Return a pointer to the register given by the R/RM field of the
* modrm byte, for byte operands. Also enables the decoding of instructions.
*/
static uint8_t *
decode_rm_byte_register(struct x86emu *emu, int reg)
{
switch (reg) {
case 0:
return &emu->x86.R_AL;
case 1:
return &emu->x86.R_CL;
case 2:
return &emu->x86.R_DL;
case 3:
return &emu->x86.R_BL;
case 4:
return &emu->x86.R_AH;
case 5:
return &emu->x86.R_CH;
case 6:
return &emu->x86.R_DH;
case 7:
return &emu->x86.R_BH;
default:
x86emu_halt_sys(emu);
}
}
static uint8_t *
decode_rl_byte_register(struct x86emu *emu)
{
return decode_rm_byte_register(emu, emu->cur_rl);
}
static uint8_t *
decode_rh_byte_register(struct x86emu *emu)
{
return decode_rm_byte_register(emu, emu->cur_rh);
}
/*
* PARAMETERS:
* reg - Register to decode
*
* RETURNS:
* Pointer to the appropriate register
*
* REMARKS:
* Return a pointer to the register given by the R/RM field of the
* modrm byte, for word operands. Also enables the decoding of instructions.
*/
static uint16_t *
decode_rm_word_register(struct x86emu *emu, int reg)
{
switch (reg) {
case 0:
return &emu->x86.R_AX;
case 1:
return &emu->x86.R_CX;
case 2:
return &emu->x86.R_DX;
case 3:
return &emu->x86.R_BX;
case 4:
return &emu->x86.R_SP;
case 5:
return &emu->x86.R_BP;
case 6:
return &emu->x86.R_SI;
case 7:
return &emu->x86.R_DI;
default:
x86emu_halt_sys(emu);
}
}
static uint16_t *
decode_rl_word_register(struct x86emu *emu)
{
return decode_rm_word_register(emu, emu->cur_rl);
}
static uint16_t *
decode_rh_word_register(struct x86emu *emu)
{
return decode_rm_word_register(emu, emu->cur_rh);
}
/*
* PARAMETERS:
* reg - Register to decode
*
* RETURNS:
* Pointer to the appropriate register
*
* REMARKS:
* Return a pointer to the register given by the R/RM field of the
* modrm byte, for dword operands. Also enables the decoding of instructions.
*/
static uint32_t *
decode_rm_long_register(struct x86emu *emu, int reg)
{
switch (reg) {
case 0:
return &emu->x86.R_EAX;
case 1:
return &emu->x86.R_ECX;
case 2:
return &emu->x86.R_EDX;
case 3:
return &emu->x86.R_EBX;
case 4:
return &emu->x86.R_ESP;
case 5:
return &emu->x86.R_EBP;
case 6:
return &emu->x86.R_ESI;
case 7:
return &emu->x86.R_EDI;
default:
x86emu_halt_sys(emu);
}
}
static uint32_t *
decode_rl_long_register(struct x86emu *emu)
{
return decode_rm_long_register(emu, emu->cur_rl);
}
static uint32_t *
decode_rh_long_register(struct x86emu *emu)
{
return decode_rm_long_register(emu, emu->cur_rh);
}
/*
* PARAMETERS:
* reg - Register to decode
*
* RETURNS:
* Pointer to the appropriate register
*
* REMARKS:
* Return a pointer to the register given by the R/RM field of the
* modrm byte, for word operands, modified from above for the weirdo
* special case of segreg operands. Also enables the decoding of instructions.
*/
static uint16_t *
decode_rh_seg_register(struct x86emu *emu)
{
switch (emu->cur_rh) {
case 0:
return &emu->x86.R_ES;
case 1:
return &emu->x86.R_CS;
case 2:
return &emu->x86.R_SS;
case 3:
return &emu->x86.R_DS;
case 4:
return &emu->x86.R_FS;
case 5:
return &emu->x86.R_GS;
default:
x86emu_halt_sys(emu);
}
}
/*
* Return offset from the SIB Byte.
*/
static uint32_t
decode_sib_address(struct x86emu *emu, int sib, int mod)
{
uint32_t base = 0, i = 0, scale = 1;
switch (sib & 0x07) {
case 0:
base = emu->x86.R_EAX;
break;
case 1:
base = emu->x86.R_ECX;
break;
case 2:
base = emu->x86.R_EDX;
break;
case 3:
base = emu->x86.R_EBX;
break;
case 4:
base = emu->x86.R_ESP;
emu->x86.mode |= SYSMODE_SEG_DS_SS;
break;
case 5:
if (mod == 0) {
base = fetch_long_imm(emu);
} else {
base = emu->x86.R_EBP;
emu->x86.mode |= SYSMODE_SEG_DS_SS;
}
break;
case 6:
base = emu->x86.R_ESI;
break;
case 7:
base = emu->x86.R_EDI;
break;
}
switch ((sib >> 3) & 0x07) {
case 0:
i = emu->x86.R_EAX;
break;
case 1:
i = emu->x86.R_ECX;
break;
case 2:
i = emu->x86.R_EDX;
break;
case 3:
i = emu->x86.R_EBX;
break;
case 4:
i = 0;
break;
case 5:
i = emu->x86.R_EBP;
break;
case 6:
i = emu->x86.R_ESI;
break;
case 7:
i = emu->x86.R_EDI;
break;
}
scale = 1 << ((sib >> 6) & 0x03);
return base + (i * scale);
}
/*
* PARAMETERS:
* rm - RM value to decode
*
* RETURNS:
* Offset in memory for the address decoding
*
* REMARKS:
* Return the offset given by mod=00, mod=01 or mod=10 addressing.
* Also enables the decoding of instructions.
*/
static uint32_t
decode_rl_address(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_ADDR) {
uint32_t offset, sib;
/* 32-bit addressing */
switch (emu->cur_rl) {
case 0:
offset = emu->x86.R_EAX;
break;
case 1:
offset = emu->x86.R_ECX;
break;
case 2:
offset = emu->x86.R_EDX;
break;
case 3:
offset = emu->x86.R_EBX;
break;
case 4:
sib = fetch_byte_imm(emu);
offset = decode_sib_address(emu, sib, 0);
break;
case 5:
if (emu->cur_mod == 0) {
offset = fetch_long_imm(emu);
} else {
emu->x86.mode |= SYSMODE_SEG_DS_SS;
offset = emu->x86.R_EBP;
}
break;
case 6:
offset = emu->x86.R_ESI;
break;
case 7:
offset = emu->x86.R_EDI;
break;
default:
x86emu_halt_sys(emu);
}
if (emu->cur_mod == 1)
offset += (int8_t)fetch_byte_imm(emu);
else if (emu->cur_mod == 2)
offset += fetch_long_imm(emu);
return offset;
} else {
uint16_t offset;
/* 16-bit addressing */
switch (emu->cur_rl) {
case 0:
offset = emu->x86.R_BX + emu->x86.R_SI;
break;
case 1:
offset = emu->x86.R_BX + emu->x86.R_DI;
break;
case 2:
emu->x86.mode |= SYSMODE_SEG_DS_SS;
offset = emu->x86.R_BP + emu->x86.R_SI;
break;
case 3:
emu->x86.mode |= SYSMODE_SEG_DS_SS;
offset = emu->x86.R_BP + emu->x86.R_DI;
break;
case 4:
offset = emu->x86.R_SI;
break;
case 5:
offset = emu->x86.R_DI;
break;
case 6:
if (emu->cur_mod == 0) {
offset = fetch_word_imm(emu);
} else {
emu->x86.mode |= SYSMODE_SEG_DS_SS;
offset = emu->x86.R_BP;
}
break;
case 7:
offset = emu->x86.R_BX;
break;
default:
x86emu_halt_sys(emu);
}
if (emu->cur_mod == 1)
offset += (int8_t)fetch_byte_imm(emu);
else if (emu->cur_mod == 2)
offset += fetch_word_imm(emu);
return offset;
}
}
static uint8_t
decode_and_fetch_byte(struct x86emu *emu)
{
if (emu->cur_mod != 3) {
emu->cur_offset = decode_rl_address(emu);
return fetch_data_byte(emu, emu->cur_offset);
} else {
return *decode_rl_byte_register(emu);
}
}
static uint16_t
decode_and_fetch_word_disp(struct x86emu *emu, int16_t disp)
{
if (emu->cur_mod != 3) {
/* TODO: A20 gate emulation */
emu->cur_offset = decode_rl_address(emu) + disp;
if ((emu->x86.mode & SYSMODE_PREFIX_ADDR) == 0)
emu->cur_offset &= 0xffff;
return fetch_data_word(emu, emu->cur_offset);
} else {
return *decode_rl_word_register(emu);
}
}
static uint32_t
decode_and_fetch_long_disp(struct x86emu *emu, int16_t disp)
{
if (emu->cur_mod != 3) {
/* TODO: A20 gate emulation */
emu->cur_offset = decode_rl_address(emu) + disp;
if ((emu->x86.mode & SYSMODE_PREFIX_ADDR) == 0)
emu->cur_offset &= 0xffff;
return fetch_data_long(emu, emu->cur_offset);
} else {
return *decode_rl_long_register(emu);
}
}
uint16_t
decode_and_fetch_word(struct x86emu *emu)
{
return decode_and_fetch_word_disp(emu, 0);
}
uint32_t
decode_and_fetch_long(struct x86emu *emu)
{
return decode_and_fetch_long_disp(emu, 0);
}
uint8_t
decode_and_fetch_byte_imm8(struct x86emu *emu, uint8_t *imm)
{
if (emu->cur_mod != 3) {
emu->cur_offset = decode_rl_address(emu);
*imm = fetch_byte_imm(emu);
return fetch_data_byte(emu, emu->cur_offset);
} else {
*imm = fetch_byte_imm(emu);
return *decode_rl_byte_register(emu);
}
}
static uint16_t
decode_and_fetch_word_imm8(struct x86emu *emu, uint8_t *imm)
{
if (emu->cur_mod != 3) {
emu->cur_offset = decode_rl_address(emu);
*imm = fetch_byte_imm(emu);
return fetch_data_word(emu, emu->cur_offset);
} else {
*imm = fetch_byte_imm(emu);
return *decode_rl_word_register(emu);
}
}
static uint32_t
decode_and_fetch_long_imm8(struct x86emu *emu, uint8_t *imm)
{
if (emu->cur_mod != 3) {
emu->cur_offset = decode_rl_address(emu);
*imm = fetch_byte_imm(emu);
return fetch_data_long(emu, emu->cur_offset);
} else {
*imm = fetch_byte_imm(emu);
return *decode_rl_long_register(emu);
}
}
static void
write_back_byte(struct x86emu *emu, uint8_t val)
{
if (emu->cur_mod != 3)
store_data_byte(emu, emu->cur_offset, val);
else
*decode_rl_byte_register(emu) = val;
}
static void
write_back_word(struct x86emu *emu, uint16_t val)
{
if (emu->cur_mod != 3)
store_data_word(emu, emu->cur_offset, val);
else
*decode_rl_word_register(emu) = val;
}
static void
write_back_long(struct x86emu *emu, uint32_t val)
{
if (emu->cur_mod != 3)
store_data_long(emu, emu->cur_offset, val);
else
*decode_rl_long_register(emu) = val;
}
static void
common_inc_word_long(struct x86emu *emu, union x86emu_register *reg)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
reg->I32_reg.e_reg = inc_long(emu, reg->I32_reg.e_reg);
else
reg->I16_reg.x_reg = inc_word(emu, reg->I16_reg.x_reg);
}
static void
common_dec_word_long(struct x86emu *emu, union x86emu_register *reg)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
reg->I32_reg.e_reg = dec_long(emu, reg->I32_reg.e_reg);
else
reg->I16_reg.x_reg = dec_word(emu, reg->I16_reg.x_reg);
}
static void
common_binop_byte_rm_r(struct x86emu *emu,
uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t))
{
uint32_t destoffset;
uint8_t *destreg, srcval;
uint8_t destval;
fetch_decode_modrm(emu);
srcval = *decode_rh_byte_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_byte(emu, destoffset);
destval = (*binop)(emu, destval, srcval);
store_data_byte(emu, destoffset, destval);
} else {
destreg = decode_rl_byte_register(emu);
*destreg = (*binop)(emu, *destreg, srcval);
}
}
static void
common_binop_ns_byte_rm_r(struct x86emu *emu,
void (*binop)(struct x86emu *, uint8_t, uint8_t))
{
uint32_t destoffset;
uint8_t destval, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_byte_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_byte(emu, destoffset);
} else {
destval = *decode_rl_byte_register(emu);
}
(*binop)(emu, destval, srcval);
}
static void
common_binop_word_rm_r(struct x86emu *emu,
uint16_t (*binop)(struct x86emu *, uint16_t, uint16_t))
{
uint32_t destoffset;
uint16_t destval, *destreg, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_word_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_word(emu, destoffset);
destval = (*binop)(emu, destval, srcval);
store_data_word(emu, destoffset, destval);
} else {
destreg = decode_rl_word_register(emu);
*destreg = (*binop)(emu, *destreg, srcval);
}
}
static void
common_binop_byte_r_rm(struct x86emu *emu,
uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t))
{
uint8_t *destreg, srcval;
uint32_t srcoffset;
fetch_decode_modrm(emu);
destreg = decode_rh_byte_register(emu);
if (emu->cur_mod != 3) {
srcoffset = decode_rl_address(emu);
srcval = fetch_data_byte(emu, srcoffset);
} else {
srcval = *decode_rl_byte_register(emu);
}
*destreg = (*binop)(emu, *destreg, srcval);
}
static void
common_binop_long_rm_r(struct x86emu *emu,
uint32_t (*binop)(struct x86emu *, uint32_t, uint32_t))
{
uint32_t destoffset;
uint32_t destval, *destreg, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_long_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_long(emu, destoffset);
destval = (*binop)(emu, destval, srcval);
store_data_long(emu, destoffset, destval);
} else {
destreg = decode_rl_long_register(emu);
*destreg = (*binop)(emu, *destreg, srcval);
}
}
static void
common_binop_word_long_rm_r(struct x86emu *emu,
uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t),
uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t))
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_binop_long_rm_r(emu, binop32);
else
common_binop_word_rm_r(emu, binop16);
}
static void
common_binop_ns_word_rm_r(struct x86emu *emu,
void (*binop)(struct x86emu *, uint16_t, uint16_t))
{
uint32_t destoffset;
uint16_t destval, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_word_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_word(emu, destoffset);
} else {
destval = *decode_rl_word_register(emu);
}
(*binop)(emu, destval, srcval);
}
static void
common_binop_ns_long_rm_r(struct x86emu *emu,
void (*binop)(struct x86emu *, uint32_t, uint32_t))
{
uint32_t destoffset;
uint32_t destval, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_long_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_long(emu, destoffset);
} else {
destval = *decode_rl_long_register(emu);
}
(*binop)(emu, destval, srcval);
}
static void
common_binop_ns_word_long_rm_r(struct x86emu *emu,
void (*binop16)(struct x86emu *, uint16_t, uint16_t),
void (*binop32)(struct x86emu *, uint32_t, uint32_t))
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_binop_ns_long_rm_r(emu, binop32);
else
common_binop_ns_word_rm_r(emu, binop16);
}
static void
common_binop_long_r_rm(struct x86emu *emu,
uint32_t (*binop)(struct x86emu *, uint32_t, uint32_t))
{
uint32_t srcoffset;
uint32_t *destreg, srcval;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
if (emu->cur_mod != 3) {
srcoffset = decode_rl_address(emu);
srcval = fetch_data_long(emu, srcoffset);
} else {
srcval = *decode_rl_long_register(emu);
}
*destreg = (*binop)(emu, *destreg, srcval);
}
static void
common_binop_word_r_rm(struct x86emu *emu,
uint16_t (*binop)(struct x86emu *, uint16_t, uint16_t))
{
uint32_t srcoffset;
uint16_t *destreg, srcval;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
if (emu->cur_mod != 3) {
srcoffset = decode_rl_address(emu);
srcval = fetch_data_word(emu, srcoffset);
} else {
srcval = *decode_rl_word_register(emu);
}
*destreg = (*binop)(emu, *destreg, srcval);
}
static void
common_binop_word_long_r_rm(struct x86emu *emu,
uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t),
uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t))
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_binop_long_r_rm(emu, binop32);
else
common_binop_word_r_rm(emu, binop16);
}
static void
common_binop_byte_imm(struct x86emu *emu,
uint8_t (*binop)(struct x86emu *, uint8_t, uint8_t))
{
uint8_t srcval;
srcval = fetch_byte_imm(emu);
emu->x86.R_AL = (*binop)(emu, emu->x86.R_AL, srcval);
}
static void
common_binop_word_long_imm(struct x86emu *emu,
uint16_t (*binop16)(struct x86emu *, uint16_t, uint16_t),
uint32_t (*binop32)(struct x86emu *, uint32_t, uint32_t))
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t srcval;
srcval = fetch_long_imm(emu);
emu->x86.R_EAX = (*binop32)(emu, emu->x86.R_EAX, srcval);
} else {
uint16_t srcval;
srcval = fetch_word_imm(emu);
emu->x86.R_AX = (*binop16)(emu, emu->x86.R_AX, srcval);
}
}
static void
common_push_word_long(struct x86emu *emu, union x86emu_register *reg)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
push_long(emu, reg->I32_reg.e_reg);
else
push_word(emu, reg->I16_reg.x_reg);
}
static void
common_pop_word_long(struct x86emu *emu, union x86emu_register *reg)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
reg->I32_reg.e_reg = pop_long(emu);
else
reg->I16_reg.x_reg = pop_word(emu);
}
static void
common_imul_long_IMM(struct x86emu *emu, int byte_imm)
{
uint32_t srcoffset;
uint32_t *destreg, srcval;
int32_t imm;
uint64_t res;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
if (emu->cur_mod != 3) {
srcoffset = decode_rl_address(emu);
srcval = fetch_data_long(emu, srcoffset);
} else {
srcval = *decode_rl_long_register(emu);
}
if (byte_imm)
imm = (int8_t)fetch_byte_imm(emu);
else
imm = fetch_long_imm(emu);
res = (int32_t)srcval * imm;
if (res > 0xffffffff) {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
}
*destreg = (uint32_t)res;
}
static void
common_imul_word_IMM(struct x86emu *emu, int byte_imm)
{
uint32_t srcoffset;
uint16_t *destreg, srcval;
int16_t imm;
uint32_t res;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
if (emu->cur_mod != 3) {
srcoffset = decode_rl_address(emu);
srcval = fetch_data_word(emu, srcoffset);
} else {
srcval = *decode_rl_word_register(emu);
}
if (byte_imm)
imm = (int8_t)fetch_byte_imm(emu);
else
imm = fetch_word_imm(emu);
res = (int16_t)srcval * imm;
if (res > 0xffff) {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
}
*destreg = (uint16_t) res;
}
static void
common_imul_imm(struct x86emu *emu, int byte_imm)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_imul_long_IMM(emu, byte_imm);
else
common_imul_word_IMM(emu, byte_imm);
}
static void
common_jmp_near(struct x86emu *emu, int cond)
{
int8_t offset;
uint16_t target;
offset = (int8_t) fetch_byte_imm(emu);
target = (uint16_t) (emu->x86.R_IP + (int16_t) offset);
if (cond)
emu->x86.R_IP = target;
}
static void
common_load_far_pointer(struct x86emu *emu, uint16_t *seg)
{
uint16_t *dstreg;
uint32_t srcoffset;
fetch_decode_modrm(emu);
if (emu->cur_mod == 3)
x86emu_halt_sys(emu);
dstreg = decode_rh_word_register(emu);
srcoffset = decode_rl_address(emu);
*dstreg = fetch_data_word(emu, srcoffset);
*seg = fetch_data_word(emu, srcoffset + 2);
}
/* Implementation */
/*
* REMARKS:
* Handles opcode 0x3a
*/
static void
x86emuOp_cmp_byte_R_RM(struct x86emu *emu)
{
uint8_t *destreg, srcval;
fetch_decode_modrm(emu);
destreg = decode_rh_byte_register(emu);
srcval = decode_and_fetch_byte(emu);
cmp_byte(emu, *destreg, srcval);
}
/*
* REMARKS:
*
* Handles opcode 0x3b
*/
static void
x86emuOp32_cmp_word_R_RM(struct x86emu *emu)
{
uint32_t srcval, *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
srcval = decode_and_fetch_long(emu);
cmp_long(emu, *destreg, srcval);
}
static void
x86emuOp16_cmp_word_R_RM(struct x86emu *emu)
{
uint16_t srcval, *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
srcval = decode_and_fetch_word(emu);
cmp_word(emu, *destreg, srcval);
}
static void
x86emuOp_cmp_word_R_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_cmp_word_R_RM(emu);
else
x86emuOp16_cmp_word_R_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0x3c
*/
static void
x86emuOp_cmp_byte_AL_IMM(struct x86emu *emu)
{
uint8_t srcval;
srcval = fetch_byte_imm(emu);
cmp_byte(emu, emu->x86.R_AL, srcval);
}
/*
* REMARKS:
* Handles opcode 0x3d
*/
static void
x86emuOp32_cmp_word_AX_IMM(struct x86emu *emu)
{
uint32_t srcval;
srcval = fetch_long_imm(emu);
cmp_long(emu, emu->x86.R_EAX, srcval);
}
static void
x86emuOp16_cmp_word_AX_IMM(struct x86emu *emu)
{
uint16_t srcval;
srcval = fetch_word_imm(emu);
cmp_word(emu, emu->x86.R_AX, srcval);
}
static void
x86emuOp_cmp_word_AX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_cmp_word_AX_IMM(emu);
else
x86emuOp16_cmp_word_AX_IMM(emu);
}
/*
* REMARKS:
* Handles opcode 0x60
*/
static void
x86emuOp_push_all(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t old_sp = emu->x86.R_ESP;
push_long(emu, emu->x86.R_EAX);
push_long(emu, emu->x86.R_ECX);
push_long(emu, emu->x86.R_EDX);
push_long(emu, emu->x86.R_EBX);
push_long(emu, old_sp);
push_long(emu, emu->x86.R_EBP);
push_long(emu, emu->x86.R_ESI);
push_long(emu, emu->x86.R_EDI);
} else {
uint16_t old_sp = emu->x86.R_SP;
push_word(emu, emu->x86.R_AX);
push_word(emu, emu->x86.R_CX);
push_word(emu, emu->x86.R_DX);
push_word(emu, emu->x86.R_BX);
push_word(emu, old_sp);
push_word(emu, emu->x86.R_BP);
push_word(emu, emu->x86.R_SI);
push_word(emu, emu->x86.R_DI);
}
}
/*
* REMARKS:
* Handles opcode 0x61
*/
static void
x86emuOp_pop_all(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EDI = pop_long(emu);
emu->x86.R_ESI = pop_long(emu);
emu->x86.R_EBP = pop_long(emu);
emu->x86.R_ESP += 4; /* skip ESP */
emu->x86.R_EBX = pop_long(emu);
emu->x86.R_EDX = pop_long(emu);
emu->x86.R_ECX = pop_long(emu);
emu->x86.R_EAX = pop_long(emu);
} else {
emu->x86.R_DI = pop_word(emu);
emu->x86.R_SI = pop_word(emu);
emu->x86.R_BP = pop_word(emu);
emu->x86.R_SP += 2;/* skip SP */
emu->x86.R_BX = pop_word(emu);
emu->x86.R_DX = pop_word(emu);
emu->x86.R_CX = pop_word(emu);
emu->x86.R_AX = pop_word(emu);
}
}
/*opcode 0x62 ILLEGAL OP, calls x86emuOp_illegal_op() */
/*opcode 0x63 ILLEGAL OP, calls x86emuOp_illegal_op() */
/*
* REMARKS:
* Handles opcode 0x68
*/
static void
x86emuOp_push_word_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t imm;
imm = fetch_long_imm(emu);
push_long(emu, imm);
} else {
uint16_t imm;
imm = fetch_word_imm(emu);
push_word(emu, imm);
}
}
/*
* REMARKS:
* Handles opcode 0x6a
*/
static void
x86emuOp_push_byte_IMM(struct x86emu *emu)
{
int16_t imm;
imm = (int8_t) fetch_byte_imm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
push_long(emu, (int32_t) imm);
} else {
push_word(emu, imm);
}
}
/*
* REMARKS:
* Handles opcode 0x6c and 0x6d
*/
static void
x86emuOp_ins_word(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
ins(emu, 4);
} else {
ins(emu, 2);
}
}
/*
* REMARKS:
* Handles opcode 0x6f
*/
static void
x86emuOp_outs_word(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
outs(emu, 4);
} else {
outs(emu, 2);
}
}
/*
* REMARKS:
* Handles opcode 0x7c
*/
static void
x86emuOp_jump_near_L(struct x86emu *emu)
{
int sf, of;
sf = ACCESS_FLAG(F_SF) != 0;
of = ACCESS_FLAG(F_OF) != 0;
common_jmp_near(emu, sf != of);
}
/*
* REMARKS:
* Handles opcode 0x7d
*/
static void
x86emuOp_jump_near_NL(struct x86emu *emu)
{
int sf, of;
sf = ACCESS_FLAG(F_SF) != 0;
of = ACCESS_FLAG(F_OF) != 0;
common_jmp_near(emu, sf == of);
}
/*
* REMARKS:
* Handles opcode 0x7e
*/
static void
x86emuOp_jump_near_LE(struct x86emu *emu)
{
int sf, of;
sf = ACCESS_FLAG(F_SF) != 0;
of = ACCESS_FLAG(F_OF) != 0;
common_jmp_near(emu, sf != of || ACCESS_FLAG(F_ZF));
}
/*
* REMARKS:
* Handles opcode 0x7f
*/
static void
x86emuOp_jump_near_NLE(struct x86emu *emu)
{
int sf, of;
sf = ACCESS_FLAG(F_SF) != 0;
of = ACCESS_FLAG(F_OF) != 0;
common_jmp_near(emu, sf == of && !ACCESS_FLAG(F_ZF));
}
static
uint8_t(*const opc80_byte_operation[]) (struct x86emu *, uint8_t d, uint8_t s) =
{
add_byte, /* 00 */
or_byte, /* 01 */
adc_byte, /* 02 */
sbb_byte, /* 03 */
and_byte, /* 04 */
sub_byte, /* 05 */
xor_byte, /* 06 */
cmp_byte, /* 07 */
};
/*
* REMARKS:
* Handles opcode 0x80
*/
static void
x86emuOp_opc80_byte_RM_IMM(struct x86emu *emu)
{
uint8_t imm, destval;
/*
* Weirdo special case instruction format. Part of the opcode
* held below in "RH". Doubly nested case would result, except
* that the decoded instruction
*/
fetch_decode_modrm(emu);
destval = decode_and_fetch_byte(emu);
imm = fetch_byte_imm(emu);
destval = (*opc80_byte_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_byte(emu, destval);
}
static
uint16_t(* const opc81_word_operation[])
(struct x86emu *, uint16_t d, uint16_t s) =
{
add_word, /* 00 */
or_word, /* 01 */
adc_word, /* 02 */
sbb_word, /* 03 */
and_word, /* 04 */
sub_word, /* 05 */
xor_word, /* 06 */
cmp_word, /* 07 */
};
static
uint32_t(* const opc81_long_operation[])
(struct x86emu *, uint32_t d, uint32_t s) =
{
add_long, /* 00 */
or_long, /* 01 */
adc_long, /* 02 */
sbb_long, /* 03 */
and_long, /* 04 */
sub_long, /* 05 */
xor_long, /* 06 */
cmp_long, /* 07 */
};
/*
* REMARKS:
* Handles opcode 0x81
*/
static void
x86emuOp32_opc81_word_RM_IMM(struct x86emu *emu)
{
uint32_t destval, imm;
/*
* Weirdo special case instruction format. Part of the opcode
* held below in "RH". Doubly nested case would result, except
* that the decoded instruction
*/
fetch_decode_modrm(emu);
destval = decode_and_fetch_long(emu);
imm = fetch_long_imm(emu);
destval = (*opc81_long_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_long(emu, destval);
}
static void
x86emuOp16_opc81_word_RM_IMM(struct x86emu *emu)
{
uint16_t destval, imm;
/*
* Weirdo special case instruction format. Part of the opcode
* held below in "RH". Doubly nested case would result, except
* that the decoded instruction
*/
fetch_decode_modrm(emu);
destval = decode_and_fetch_word(emu);
imm = fetch_word_imm(emu);
destval = (*opc81_word_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_word(emu, destval);
}
static void
x86emuOp_opc81_word_RM_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_opc81_word_RM_IMM(emu);
else
x86emuOp16_opc81_word_RM_IMM(emu);
}
static
uint8_t(* const opc82_byte_operation[])
(struct x86emu *, uint8_t s, uint8_t d) =
{
add_byte, /* 00 */
or_byte, /* 01 *//* YYY UNUSED ???? */
adc_byte, /* 02 */
sbb_byte, /* 03 */
and_byte, /* 04 *//* YYY UNUSED ???? */
sub_byte, /* 05 */
xor_byte, /* 06 *//* YYY UNUSED ???? */
cmp_byte, /* 07 */
};
/*
* REMARKS:
* Handles opcode 0x82
*/
static void
x86emuOp_opc82_byte_RM_IMM(struct x86emu *emu)
{
uint8_t imm, destval;
/*
* Weirdo special case instruction format. Part of the opcode
* held below in "RH". Doubly nested case would result, except
* that the decoded instruction Similar to opcode 81, except that
* the immediate byte is sign extended to a word length.
*/
fetch_decode_modrm(emu);
destval = decode_and_fetch_byte(emu);
imm = fetch_byte_imm(emu);
destval = (*opc82_byte_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_byte(emu, destval);
}
static
uint16_t(* const opc83_word_operation[])
(struct x86emu *, uint16_t s, uint16_t d) =
{
add_word, /* 00 */
or_word, /* 01 *//* YYY UNUSED ???? */
adc_word, /* 02 */
sbb_word, /* 03 */
and_word, /* 04 *//* YYY UNUSED ???? */
sub_word, /* 05 */
xor_word, /* 06 *//* YYY UNUSED ???? */
cmp_word, /* 07 */
};
static
uint32_t(* const opc83_long_operation[])
(struct x86emu *, uint32_t s, uint32_t d) =
{
add_long, /* 00 */
or_long, /* 01 *//* YYY UNUSED ???? */
adc_long, /* 02 */
sbb_long, /* 03 */
and_long, /* 04 *//* YYY UNUSED ???? */
sub_long, /* 05 */
xor_long, /* 06 *//* YYY UNUSED ???? */
cmp_long, /* 07 */
};
/*
* REMARKS:
* Handles opcode 0x83
*/
static void
x86emuOp32_opc83_word_RM_IMM(struct x86emu *emu)
{
uint32_t destval, imm;
fetch_decode_modrm(emu);
destval = decode_and_fetch_long(emu);
imm = (int8_t) fetch_byte_imm(emu);
destval = (*opc83_long_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_long(emu, destval);
}
static void
x86emuOp16_opc83_word_RM_IMM(struct x86emu *emu)
{
uint16_t destval, imm;
fetch_decode_modrm(emu);
destval = decode_and_fetch_word(emu);
imm = (int8_t) fetch_byte_imm(emu);
destval = (*opc83_word_operation[emu->cur_rh]) (emu, destval, imm);
if (emu->cur_rh != 7)
write_back_word(emu, destval);
}
static void
x86emuOp_opc83_word_RM_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_opc83_word_RM_IMM(emu);
else
x86emuOp16_opc83_word_RM_IMM(emu);
}
/*
* REMARKS:
* Handles opcode 0x86
*/
static void
x86emuOp_xchg_byte_RM_R(struct x86emu *emu)
{
uint8_t *srcreg, destval, tmp;
fetch_decode_modrm(emu);
destval = decode_and_fetch_byte(emu);
srcreg = decode_rh_byte_register(emu);
tmp = destval;
destval = *srcreg;
*srcreg = tmp;
write_back_byte(emu, destval);
}
/*
* REMARKS:
* Handles opcode 0x87
*/
static void
x86emuOp32_xchg_word_RM_R(struct x86emu *emu)
{
uint32_t *srcreg, destval, tmp;
fetch_decode_modrm(emu);
destval = decode_and_fetch_long(emu);
srcreg = decode_rh_long_register(emu);
tmp = destval;
destval = *srcreg;
*srcreg = tmp;
write_back_long(emu, destval);
}
static void
x86emuOp16_xchg_word_RM_R(struct x86emu *emu)
{
uint16_t *srcreg, destval, tmp;
fetch_decode_modrm(emu);
destval = decode_and_fetch_word(emu);
srcreg = decode_rh_word_register(emu);
tmp = destval;
destval = *srcreg;
*srcreg = tmp;
write_back_word(emu, destval);
}
static void
x86emuOp_xchg_word_RM_R(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_xchg_word_RM_R(emu);
else
x86emuOp16_xchg_word_RM_R(emu);
}
/*
* REMARKS:
* Handles opcode 0x88
*/
static void
x86emuOp_mov_byte_RM_R(struct x86emu *emu)
{
uint8_t *destreg, *srcreg;
uint32_t destoffset;
fetch_decode_modrm(emu);
srcreg = decode_rh_byte_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
store_data_byte(emu, destoffset, *srcreg);
} else {
destreg = decode_rl_byte_register(emu);
*destreg = *srcreg;
}
}
/*
* REMARKS:
* Handles opcode 0x89
*/
static void
x86emuOp32_mov_word_RM_R(struct x86emu *emu)
{
uint32_t destoffset;
uint32_t *destreg, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_long_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
store_data_long(emu, destoffset, srcval);
} else {
destreg = decode_rl_long_register(emu);
*destreg = srcval;
}
}
static void
x86emuOp16_mov_word_RM_R(struct x86emu *emu)
{
uint32_t destoffset;
uint16_t *destreg, srcval;
fetch_decode_modrm(emu);
srcval = *decode_rh_word_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
store_data_word(emu, destoffset, srcval);
} else {
destreg = decode_rl_word_register(emu);
*destreg = srcval;
}
}
static void
x86emuOp_mov_word_RM_R(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_mov_word_RM_R(emu);
else
x86emuOp16_mov_word_RM_R(emu);
}
/*
* REMARKS:
* Handles opcode 0x8a
*/
static void
x86emuOp_mov_byte_R_RM(struct x86emu *emu)
{
uint8_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_byte_register(emu);
*destreg = decode_and_fetch_byte(emu);
}
/*
* REMARKS:
* Handles opcode 0x8b
*/
static void
x86emuOp_mov_word_R_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
*destreg = decode_and_fetch_long(emu);
} else {
uint16_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
*destreg = decode_and_fetch_word(emu);
}
}
/*
* REMARKS:
* Handles opcode 0x8c
*/
static void
x86emuOp_mov_word_RM_SR(struct x86emu *emu)
{
uint16_t *destreg, srcval;
uint32_t destoffset;
fetch_decode_modrm(emu);
srcval = *decode_rh_seg_register(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
store_data_word(emu, destoffset, srcval);
} else {
destreg = decode_rl_word_register(emu);
*destreg = srcval;
}
}
/*
* REMARKS:
* Handles opcode 0x8d
*/
static void
x86emuOp_lea_word_R_M(struct x86emu *emu)
{
uint32_t destoffset;
fetch_decode_modrm(emu);
if (emu->cur_mod == 3)
x86emu_halt_sys(emu);
destoffset = decode_rl_address(emu);
if (emu->x86.mode & SYSMODE_PREFIX_ADDR) {
uint32_t *srcreg;
srcreg = decode_rh_long_register(emu);
*srcreg = (uint32_t) destoffset;
} else {
uint16_t *srcreg;
srcreg = decode_rh_word_register(emu);
*srcreg = (uint16_t) destoffset;
}
}
/*
* REMARKS:
* Handles opcode 0x8e
*/
static void
x86emuOp_mov_word_SR_RM(struct x86emu *emu)
{
uint16_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_seg_register(emu);
*destreg = decode_and_fetch_word(emu);
/*
* Clean up, and reset all the R_xSP pointers to the correct
* locations. This is about 3x too much overhead (doing all the
* segreg ptrs when only one is needed, but this instruction
* *cannot* be that common, and this isn't too much work anyway.
*/
}
/*
* REMARKS:
* Handles opcode 0x8f
*/
static void
x86emuOp32_pop_RM(struct x86emu *emu)
{
uint32_t destoffset;
uint32_t destval, *destreg;
fetch_decode_modrm(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = pop_long(emu);
store_data_long(emu, destoffset, destval);
} else {
destreg = decode_rl_long_register(emu);
*destreg = pop_long(emu);
}
}
static void
x86emuOp16_pop_RM(struct x86emu *emu)
{
uint32_t destoffset;
uint16_t destval, *destreg;
fetch_decode_modrm(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = pop_word(emu);
store_data_word(emu, destoffset, destval);
} else {
destreg = decode_rl_word_register(emu);
*destreg = pop_word(emu);
}
}
static void
x86emuOp_pop_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_pop_RM(emu);
else
x86emuOp16_pop_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0x91
*/
static void
x86emuOp_xchg_word_AX_CX(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_ECX;
emu->x86.R_ECX = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_CX;
emu->x86.R_CX = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x92
*/
static void
x86emuOp_xchg_word_AX_DX(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_EDX;
emu->x86.R_EDX = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_DX;
emu->x86.R_DX = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x93
*/
static void
x86emuOp_xchg_word_AX_BX(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_EBX;
emu->x86.R_EBX = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_BX;
emu->x86.R_BX = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x94
*/
static void
x86emuOp_xchg_word_AX_SP(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_ESP;
emu->x86.R_ESP = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_SP;
emu->x86.R_SP = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x95
*/
static void
x86emuOp_xchg_word_AX_BP(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_EBP;
emu->x86.R_EBP = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_BP;
emu->x86.R_BP = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x96
*/
static void
x86emuOp_xchg_word_AX_SI(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_ESI;
emu->x86.R_ESI = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_SI;
emu->x86.R_SI = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x97
*/
static void
x86emuOp_xchg_word_AX_DI(struct x86emu *emu)
{
uint32_t tmp;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
tmp = emu->x86.R_EAX;
emu->x86.R_EAX = emu->x86.R_EDI;
emu->x86.R_EDI = tmp;
} else {
tmp = emu->x86.R_AX;
emu->x86.R_AX = emu->x86.R_DI;
emu->x86.R_DI = (uint16_t) tmp;
}
}
/*
* REMARKS:
* Handles opcode 0x98
*/
static void
x86emuOp_cbw(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
if (emu->x86.R_AX & 0x8000) {
emu->x86.R_EAX |= 0xffff0000;
} else {
emu->x86.R_EAX &= 0x0000ffff;
}
} else {
if (emu->x86.R_AL & 0x80) {
emu->x86.R_AH = 0xff;
} else {
emu->x86.R_AH = 0x0;
}
}
}
/*
* REMARKS:
* Handles opcode 0x99
*/
static void
x86emuOp_cwd(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
if (emu->x86.R_EAX & 0x80000000) {
emu->x86.R_EDX = 0xffffffff;
} else {
emu->x86.R_EDX = 0x0;
}
} else {
if (emu->x86.R_AX & 0x8000) {
emu->x86.R_DX = 0xffff;
} else {
emu->x86.R_DX = 0x0;
}
}
}
/*
* REMARKS:
* Handles opcode 0x9a
*/
static void
x86emuOp_call_far_IMM(struct x86emu *emu)
{
uint16_t farseg, faroff;
faroff = fetch_word_imm(emu);
farseg = fetch_word_imm(emu);
/* XXX
*
* Hooked interrupt vectors calling into our "BIOS" will cause problems
* unless all intersegment stuff is checked for BIOS access. Check
* needed here. For moment, let it alone. */
push_word(emu, emu->x86.R_CS);
emu->x86.R_CS = farseg;
push_word(emu, emu->x86.R_IP);
emu->x86.R_IP = faroff;
}
/*
* REMARKS:
* Handles opcode 0x9c
*/
static void
x86emuOp_pushf_word(struct x86emu *emu)
{
uint32_t flags;
/* clear out *all* bits not representing flags, and turn on real bits */
flags = (emu->x86.R_EFLG & F_MSK) | F_ALWAYS_ON;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
push_long(emu, flags);
} else {
push_word(emu, (uint16_t) flags);
}
}
/*
* REMARKS:
* Handles opcode 0x9d
*/
static void
x86emuOp_popf_word(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EFLG = pop_long(emu);
} else {
emu->x86.R_FLG = pop_word(emu);
}
}
/*
* REMARKS:
* Handles opcode 0x9e
*/
static void
x86emuOp_sahf(struct x86emu *emu)
{
/* clear the lower bits of the flag register */
emu->x86.R_FLG &= 0xffffff00;
/* or in the AH register into the flags register */
emu->x86.R_FLG |= emu->x86.R_AH;
}
/*
* REMARKS:
* Handles opcode 0x9f
*/
static void
x86emuOp_lahf(struct x86emu *emu)
{
emu->x86.R_AH = (uint8_t) (emu->x86.R_FLG & 0xff);
/* undocumented TC++ behavior??? Nope. It's documented, but you have
* too look real hard to notice it. */
emu->x86.R_AH |= 0x2;
}
/*
* REMARKS:
* Handles opcode 0xa0
*/
static void
x86emuOp_mov_AL_M_IMM(struct x86emu *emu)
{
uint16_t offset;
offset = fetch_word_imm(emu);
emu->x86.R_AL = fetch_data_byte(emu, offset);
}
/*
* REMARKS:
* Handles opcode 0xa1
*/
static void
x86emuOp_mov_AX_M_IMM(struct x86emu *emu)
{
uint16_t offset;
offset = fetch_word_imm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EAX = fetch_data_long(emu, offset);
} else {
emu->x86.R_AX = fetch_data_word(emu, offset);
}
}
/*
* REMARKS:
* Handles opcode 0xa2
*/
static void
x86emuOp_mov_M_AL_IMM(struct x86emu *emu)
{
uint16_t offset;
offset = fetch_word_imm(emu);
store_data_byte(emu, offset, emu->x86.R_AL);
}
/*
* REMARKS:
* Handles opcode 0xa3
*/
static void
x86emuOp_mov_M_AX_IMM(struct x86emu *emu)
{
uint16_t offset;
offset = fetch_word_imm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
store_data_long(emu, offset, emu->x86.R_EAX);
} else {
store_data_word(emu, offset, emu->x86.R_AX);
}
}
/*
* REMARKS:
* Handles opcode 0xa4
*/
static void
x86emuOp_movs_byte(struct x86emu *emu)
{
uint8_t val;
uint32_t count;
int inc;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -1;
else
inc = 1;
count = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
count = emu->x86.R_CX;
emu->x86.R_CX = 0;
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
}
while (count--) {
val = fetch_data_byte(emu, emu->x86.R_SI);
store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, val);
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xa5
*/
static void
x86emuOp_movs_word(struct x86emu *emu)
{
uint32_t val;
int inc;
uint32_t count;
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
inc = 4;
else
inc = 2;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -inc;
count = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
count = emu->x86.R_CX;
emu->x86.R_CX = 0;
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
}
while (count--) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val = fetch_data_long(emu, emu->x86.R_SI);
store_long(emu, emu->x86.R_ES, emu->x86.R_DI, val);
} else {
val = fetch_data_word(emu, emu->x86.R_SI);
store_word(emu, emu->x86.R_ES, emu->x86.R_DI,
(uint16_t) val);
}
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xa6
*/
static void
x86emuOp_cmps_byte(struct x86emu *emu)
{
int8_t val1, val2;
int inc;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -1;
else
inc = 1;
if (emu->x86.mode & SYSMODE_PREFIX_REPE) {
/* REPE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
val1 = fetch_data_byte(emu, emu->x86.R_SI);
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, val1, val2);
emu->x86.R_CX -= 1;
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF) == 0)
break;
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPE;
} else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) {
/* REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
val1 = fetch_data_byte(emu, emu->x86.R_SI);
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, val1, val2);
emu->x86.R_CX -= 1;
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF))
break; /* zero flag set means equal */
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPNE;
} else {
val1 = fetch_data_byte(emu, emu->x86.R_SI);
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, val1, val2);
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xa7
*/
static void
x86emuOp_cmps_word(struct x86emu *emu)
{
uint32_t val1, val2;
int inc;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
if (ACCESS_FLAG(F_DF)) /* down */
inc = -4;
else
inc = 4;
} else {
if (ACCESS_FLAG(F_DF)) /* down */
inc = -2;
else
inc = 2;
}
if (emu->x86.mode & SYSMODE_PREFIX_REPE) {
/* REPE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val1 = fetch_data_long(emu, emu->x86.R_SI);
val2 = fetch_long(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_long(emu, val1, val2);
} else {
val1 = fetch_data_word(emu, emu->x86.R_SI);
val2 = fetch_word(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_word(emu, (uint16_t) val1, (uint16_t) val2);
}
emu->x86.R_CX -= 1;
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF) == 0)
break;
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPE;
} else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) {
/* REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val1 = fetch_data_long(emu, emu->x86.R_SI);
val2 = fetch_long(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_long(emu, val1, val2);
} else {
val1 = fetch_data_word(emu, emu->x86.R_SI);
val2 = fetch_word(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_word(emu, (uint16_t) val1, (uint16_t) val2);
}
emu->x86.R_CX -= 1;
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF))
break; /* zero flag set means equal */
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPNE;
} else {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val1 = fetch_data_long(emu, emu->x86.R_SI);
val2 = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_long(emu, val1, val2);
} else {
val1 = fetch_data_word(emu, emu->x86.R_SI);
val2 = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_word(emu, (uint16_t) val1, (uint16_t) val2);
}
emu->x86.R_SI += inc;
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xa9
*/
static void
x86emuOp_test_AX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
test_long(emu, emu->x86.R_EAX, fetch_long_imm(emu));
} else {
test_word(emu, emu->x86.R_AX, fetch_word_imm(emu));
}
}
/*
* REMARKS:
* Handles opcode 0xaa
*/
static void
x86emuOp_stos_byte(struct x86emu *emu)
{
int inc;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -1;
else
inc = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
store_byte(emu, emu->x86.R_ES, emu->x86.R_DI,
emu->x86.R_AL);
emu->x86.R_CX -= 1;
emu->x86.R_DI += inc;
}
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
} else {
store_byte(emu, emu->x86.R_ES, emu->x86.R_DI, emu->x86.R_AL);
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xab
*/
static void
x86emuOp_stos_word(struct x86emu *emu)
{
int inc;
uint32_t count;
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
inc = 4;
else
inc = 2;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -inc;
count = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
count = emu->x86.R_CX;
emu->x86.R_CX = 0;
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
}
while (count--) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
store_long(emu, emu->x86.R_ES, emu->x86.R_DI,
emu->x86.R_EAX);
} else {
store_word(emu, emu->x86.R_ES, emu->x86.R_DI,
emu->x86.R_AX);
}
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xac
*/
static void
x86emuOp_lods_byte(struct x86emu *emu)
{
int inc;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -1;
else
inc = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
emu->x86.R_AL = fetch_data_byte(emu, emu->x86.R_SI);
emu->x86.R_CX -= 1;
emu->x86.R_SI += inc;
}
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
} else {
emu->x86.R_AL = fetch_data_byte(emu, emu->x86.R_SI);
emu->x86.R_SI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xad
*/
static void
x86emuOp_lods_word(struct x86emu *emu)
{
int inc;
uint32_t count;
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
inc = 4;
else
inc = 2;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -inc;
count = 1;
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* move them until CX is ZERO. */
count = emu->x86.R_CX;
emu->x86.R_CX = 0;
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
}
while (count--) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EAX = fetch_data_long(emu, emu->x86.R_SI);
} else {
emu->x86.R_AX = fetch_data_word(emu, emu->x86.R_SI);
}
emu->x86.R_SI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xae
*/
static void
x86emuOp_scas_byte(struct x86emu *emu)
{
int8_t val2;
int inc;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -1;
else
inc = 1;
if (emu->x86.mode & SYSMODE_PREFIX_REPE) {
/* REPE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, emu->x86.R_AL, val2);
emu->x86.R_CX -= 1;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF) == 0)
break;
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPE;
} else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) {
/* REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, emu->x86.R_AL, val2);
emu->x86.R_CX -= 1;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF))
break; /* zero flag set means equal */
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPNE;
} else {
val2 = fetch_byte(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_byte(emu, emu->x86.R_AL, val2);
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xaf
*/
static void
x86emuOp_scas_word(struct x86emu *emu)
{
int inc;
uint32_t val;
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
inc = 4;
else
inc = 2;
if (ACCESS_FLAG(F_DF)) /* down */
inc = -inc;
if (emu->x86.mode & SYSMODE_PREFIX_REPE) {
/* REPE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val = fetch_long(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_long(emu, emu->x86.R_EAX, val);
} else {
val = fetch_word(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_word(emu, emu->x86.R_AX, (uint16_t) val);
}
emu->x86.R_CX -= 1;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF) == 0)
break;
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPE;
} else if (emu->x86.mode & SYSMODE_PREFIX_REPNE) {
/* REPNE */
/* move them until CX is ZERO. */
while (emu->x86.R_CX != 0) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val = fetch_long(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_long(emu, emu->x86.R_EAX, val);
} else {
val = fetch_word(emu, emu->x86.R_ES,
emu->x86.R_DI);
cmp_word(emu, emu->x86.R_AX, (uint16_t) val);
}
emu->x86.R_CX -= 1;
emu->x86.R_DI += inc;
if (ACCESS_FLAG(F_ZF))
break; /* zero flag set means equal */
}
emu->x86.mode &= ~SYSMODE_PREFIX_REPNE;
} else {
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
val = fetch_long(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_long(emu, emu->x86.R_EAX, val);
} else {
val = fetch_word(emu, emu->x86.R_ES, emu->x86.R_DI);
cmp_word(emu, emu->x86.R_AX, (uint16_t) val);
}
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Handles opcode 0xb8
*/
static void
x86emuOp_mov_word_AX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_EAX = fetch_long_imm(emu);
else
emu->x86.R_AX = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xb9
*/
static void
x86emuOp_mov_word_CX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_ECX = fetch_long_imm(emu);
else
emu->x86.R_CX = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xba
*/
static void
x86emuOp_mov_word_DX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_EDX = fetch_long_imm(emu);
else
emu->x86.R_DX = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xbb
*/
static void
x86emuOp_mov_word_BX_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_EBX = fetch_long_imm(emu);
else
emu->x86.R_BX = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xbc
*/
static void
x86emuOp_mov_word_SP_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_ESP = fetch_long_imm(emu);
else
emu->x86.R_SP = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xbd
*/
static void
x86emuOp_mov_word_BP_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_EBP = fetch_long_imm(emu);
else
emu->x86.R_BP = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xbe
*/
static void
x86emuOp_mov_word_SI_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_ESI = fetch_long_imm(emu);
else
emu->x86.R_SI = fetch_word_imm(emu);
}
/*
* REMARKS:
* Handles opcode 0xbf
*/
static void
x86emuOp_mov_word_DI_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
emu->x86.R_EDI = fetch_long_imm(emu);
else
emu->x86.R_DI = fetch_word_imm(emu);
}
/* used by opcodes c0, d0, and d2. */
static
uint8_t(* const opcD0_byte_operation[])
(struct x86emu *, uint8_t d, uint8_t s) =
{
rol_byte,
ror_byte,
rcl_byte,
rcr_byte,
shl_byte,
shr_byte,
shl_byte, /* sal_byte === shl_byte by definition */
sar_byte,
};
/*
* REMARKS:
* Handles opcode 0xc0
*/
static void
x86emuOp_opcC0_byte_RM_MEM(struct x86emu *emu)
{
uint8_t destval, amt;
/*
* Yet another weirdo special case instruction format. Part of
* the opcode held below in "RH". Doubly nested case would
* result, except that the decoded instruction
*/
fetch_decode_modrm(emu);
/* know operation, decode the mod byte to find the addressing mode. */
destval = decode_and_fetch_byte_imm8(emu, &amt);
destval = (*opcD0_byte_operation[emu->cur_rh]) (emu, destval, amt);
write_back_byte(emu, destval);
}
/* used by opcodes c1, d1, and d3. */
static
uint16_t(* const opcD1_word_operation[])
(struct x86emu *, uint16_t s, uint8_t d) =
{
rol_word,
ror_word,
rcl_word,
rcr_word,
shl_word,
shr_word,
shl_word, /* sal_byte === shl_byte by definition */
sar_word,
};
/* used by opcodes c1, d1, and d3. */
static
uint32_t(* const opcD1_long_operation[])
(struct x86emu *, uint32_t s, uint8_t d) =
{
rol_long,
ror_long,
rcl_long,
rcr_long,
shl_long,
shr_long,
shl_long, /* sal_byte === shl_byte by definition */
sar_long,
};
/*
* REMARKS:
* Handles opcode 0xc1
*/
static void
x86emuOp_opcC1_word_RM_MEM(struct x86emu *emu)
{
uint8_t amt;
/*
* Yet another weirdo special case instruction format. Part of
* the opcode held below in "RH". Doubly nested case would
* result, except that the decoded instruction
*/
fetch_decode_modrm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t destval;
destval = decode_and_fetch_long_imm8(emu, &amt);
destval = (*opcD1_long_operation[emu->cur_rh])
(emu, destval, amt);
write_back_long(emu, destval);
} else {
uint16_t destval;
destval = decode_and_fetch_word_imm8(emu, &amt);
destval = (*opcD1_word_operation[emu->cur_rh])
(emu, destval, amt);
write_back_word(emu, destval);
}
}
/*
* REMARKS:
* Handles opcode 0xc2
*/
static void
x86emuOp_ret_near_IMM(struct x86emu *emu)
{
uint16_t imm;
imm = fetch_word_imm(emu);
emu->x86.R_IP = pop_word(emu);
emu->x86.R_SP += imm;
}
/*
* REMARKS:
* Handles opcode 0xc6
*/
static void
x86emuOp_mov_byte_RM_IMM(struct x86emu *emu)
{
uint8_t *destreg;
uint32_t destoffset;
uint8_t imm;
fetch_decode_modrm(emu);
if (emu->cur_rh != 0)
x86emu_halt_sys(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
imm = fetch_byte_imm(emu);
store_data_byte(emu, destoffset, imm);
} else {
destreg = decode_rl_byte_register(emu);
imm = fetch_byte_imm(emu);
*destreg = imm;
}
}
/*
* REMARKS:
* Handles opcode 0xc7
*/
static void
x86emuOp32_mov_word_RM_IMM(struct x86emu *emu)
{
uint32_t destoffset;
uint32_t imm, *destreg;
fetch_decode_modrm(emu);
if (emu->cur_rh != 0)
x86emu_halt_sys(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
imm = fetch_long_imm(emu);
store_data_long(emu, destoffset, imm);
} else {
destreg = decode_rl_long_register(emu);
imm = fetch_long_imm(emu);
*destreg = imm;
}
}
static void
x86emuOp16_mov_word_RM_IMM(struct x86emu *emu)
{
uint32_t destoffset;
uint16_t imm, *destreg;
fetch_decode_modrm(emu);
if (emu->cur_rh != 0)
x86emu_halt_sys(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
imm = fetch_word_imm(emu);
store_data_word(emu, destoffset, imm);
} else {
destreg = decode_rl_word_register(emu);
imm = fetch_word_imm(emu);
*destreg = imm;
}
}
static void
x86emuOp_mov_word_RM_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_mov_word_RM_IMM(emu);
else
x86emuOp16_mov_word_RM_IMM(emu);
}
/*
* REMARKS:
* Handles opcode 0xc8
*/
static void
x86emuOp_enter(struct x86emu *emu)
{
uint16_t local, frame_pointer;
uint8_t nesting;
int i;
local = fetch_word_imm(emu);
nesting = fetch_byte_imm(emu);
push_word(emu, emu->x86.R_BP);
frame_pointer = emu->x86.R_SP;
if (nesting > 0) {
for (i = 1; i < nesting; i++) {
emu->x86.R_BP -= 2;
push_word(emu, fetch_word(emu, emu->x86.R_SS,
emu->x86.R_BP));
}
push_word(emu, frame_pointer);
}
emu->x86.R_BP = frame_pointer;
emu->x86.R_SP = (uint16_t) (emu->x86.R_SP - local);
}
/*
* REMARKS:
* Handles opcode 0xc9
*/
static void
x86emuOp_leave(struct x86emu *emu)
{
emu->x86.R_SP = emu->x86.R_BP;
emu->x86.R_BP = pop_word(emu);
}
/*
* REMARKS:
* Handles opcode 0xca
*/
static void
x86emuOp_ret_far_IMM(struct x86emu *emu)
{
uint16_t imm;
imm = fetch_word_imm(emu);
emu->x86.R_IP = pop_word(emu);
emu->x86.R_CS = pop_word(emu);
emu->x86.R_SP += imm;
}
/*
* REMARKS:
* Handles opcode 0xcb
*/
static void
x86emuOp_ret_far(struct x86emu *emu)
{
emu->x86.R_IP = pop_word(emu);
emu->x86.R_CS = pop_word(emu);
}
/*
* REMARKS:
* Handles opcode 0xcc
*/
static void
x86emuOp_int3(struct x86emu *emu)
{
x86emu_intr_dispatch(emu, 3);
}
/*
* REMARKS:
* Handles opcode 0xcd
*/
static void
x86emuOp_int_IMM(struct x86emu *emu)
{
uint8_t intnum;
intnum = fetch_byte_imm(emu);
x86emu_intr_dispatch(emu, intnum);
}
/*
* REMARKS:
* Handles opcode 0xce
*/
static void
x86emuOp_into(struct x86emu *emu)
{
if (ACCESS_FLAG(F_OF))
x86emu_intr_dispatch(emu, 4);
}
/*
* REMARKS:
* Handles opcode 0xcf
*/
static void
x86emuOp_iret(struct x86emu *emu)
{
emu->x86.R_IP = pop_word(emu);
emu->x86.R_CS = pop_word(emu);
emu->x86.R_FLG = pop_word(emu);
}
/*
* REMARKS:
* Handles opcode 0xd0
*/
static void
x86emuOp_opcD0_byte_RM_1(struct x86emu *emu)
{
uint8_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_byte(emu);
destval = (*opcD0_byte_operation[emu->cur_rh]) (emu, destval, 1);
write_back_byte(emu, destval);
}
/*
* REMARKS:
* Handles opcode 0xd1
*/
static void
x86emuOp_opcD1_word_RM_1(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_long(emu);
destval = (*opcD1_long_operation[emu->cur_rh])(emu, destval, 1);
write_back_long(emu, destval);
} else {
uint16_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_word(emu);
destval = (*opcD1_word_operation[emu->cur_rh])(emu, destval, 1);
write_back_word(emu, destval);
}
}
/*
* REMARKS:
* Handles opcode 0xd2
*/
static void
x86emuOp_opcD2_byte_RM_CL(struct x86emu *emu)
{
uint8_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_byte(emu);
destval = (*opcD0_byte_operation[emu->cur_rh])
(emu, destval, emu->x86.R_CL);
write_back_byte(emu, destval);
}
/*
* REMARKS:
* Handles opcode 0xd3
*/
static void
x86emuOp_opcD3_word_RM_CL(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
uint32_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_long(emu);
destval = (*opcD1_long_operation[emu->cur_rh])
(emu, destval, emu->x86.R_CL);
write_back_long(emu, destval);
} else {
uint16_t destval;
fetch_decode_modrm(emu);
destval = decode_and_fetch_word(emu);
destval = (*opcD1_word_operation[emu->cur_rh])
(emu, destval, emu->x86.R_CL);
write_back_word(emu, destval);
}
}
/*
* REMARKS:
* Handles opcode 0xd4
*/
static void
x86emuOp_aam(struct x86emu *emu)
{
uint8_t a;
a = fetch_byte_imm(emu); /* this is a stupid encoding. */
if (a != 10) {
/* fix: add base decoding aam_word(uint8_t val, int base a) */
x86emu_halt_sys(emu);
}
/* note the type change here --- returning AL and AH in AX. */
emu->x86.R_AX = aam_word(emu, emu->x86.R_AL);
}
/*
* REMARKS:
* Handles opcode 0xd5
*/
static void
x86emuOp_aad(struct x86emu *emu)
{
uint8_t a;
a = fetch_byte_imm(emu);
if (a != 10) {
/* fix: add base decoding aad_word(uint16_t val, int base a) */
x86emu_halt_sys(emu);
}
emu->x86.R_AX = aad_word(emu, emu->x86.R_AX);
}
/* opcode 0xd6 ILLEGAL OPCODE */
/*
* REMARKS:
* Handles opcode 0xd7
*/
static void
x86emuOp_xlat(struct x86emu *emu)
{
uint16_t addr;
addr = (uint16_t) (emu->x86.R_BX + (uint8_t) emu->x86.R_AL);
emu->x86.R_AL = fetch_data_byte(emu, addr);
}
/* opcode=0xd8 */
static void
x86emuOp_esc_coprocess_d8(struct x86emu *emu)
{
}
/* opcode=0xd9 */
static void
x86emuOp_esc_coprocess_d9(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xda */
static void
x86emuOp_esc_coprocess_da(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xdb */
static void
x86emuOp_esc_coprocess_db(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xdc */
static void
x86emuOp_esc_coprocess_dc(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xdd */
static void
x86emuOp_esc_coprocess_dd(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xde */
static void
x86emuOp_esc_coprocess_de(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/* opcode=0xdf */
static void
x86emuOp_esc_coprocess_df(struct x86emu *emu)
{
fetch_decode_modrm(emu);
if (emu->cur_mod != 3)
decode_rl_address(emu);
}
/*
* REMARKS:
* Handles opcode 0xe0
*/
static void
x86emuOp_loopne(struct x86emu *emu)
{
int16_t ip;
ip = (int8_t) fetch_byte_imm(emu);
ip += (int16_t) emu->x86.R_IP;
emu->x86.R_CX -= 1;
if (emu->x86.R_CX != 0 && !ACCESS_FLAG(F_ZF)) /* CX != 0 and !ZF */
emu->x86.R_IP = ip;
}
/*
* REMARKS:
* Handles opcode 0xe1
*/
static void
x86emuOp_loope(struct x86emu *emu)
{
int16_t ip;
ip = (int8_t) fetch_byte_imm(emu);
ip += (int16_t) emu->x86.R_IP;
emu->x86.R_CX -= 1;
if (emu->x86.R_CX != 0 && ACCESS_FLAG(F_ZF)) /* CX != 0 and ZF */
emu->x86.R_IP = ip;
}
/*
* REMARKS:
* Handles opcode 0xe2
*/
static void
x86emuOp_loop(struct x86emu *emu)
{
int16_t ip;
ip = (int8_t) fetch_byte_imm(emu);
ip += (int16_t) emu->x86.R_IP;
emu->x86.R_CX -= 1;
if (emu->x86.R_CX != 0)
emu->x86.R_IP = ip;
}
/*
* REMARKS:
* Handles opcode 0xe3
*/
static void
x86emuOp_jcxz(struct x86emu *emu)
{
uint16_t target;
int8_t offset;
/* jump to byte offset if overflow flag is set */
offset = (int8_t) fetch_byte_imm(emu);
target = (uint16_t) (emu->x86.R_IP + offset);
if (emu->x86.R_CX == 0)
emu->x86.R_IP = target;
}
/*
* REMARKS:
* Handles opcode 0xe4
*/
static void
x86emuOp_in_byte_AL_IMM(struct x86emu *emu)
{
uint8_t port;
port = (uint8_t) fetch_byte_imm(emu);
emu->x86.R_AL = (*emu->emu_inb) (emu, port);
}
/*
* REMARKS:
* Handles opcode 0xe5
*/
static void
x86emuOp_in_word_AX_IMM(struct x86emu *emu)
{
uint8_t port;
port = (uint8_t) fetch_byte_imm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EAX = (*emu->emu_inl) (emu, port);
} else {
emu->x86.R_AX = (*emu->emu_inw) (emu, port);
}
}
/*
* REMARKS:
* Handles opcode 0xe6
*/
static void
x86emuOp_out_byte_IMM_AL(struct x86emu *emu)
{
uint8_t port;
port = (uint8_t) fetch_byte_imm(emu);
(*emu->emu_outb) (emu, port, emu->x86.R_AL);
}
/*
* REMARKS:
* Handles opcode 0xe7
*/
static void
x86emuOp_out_word_IMM_AX(struct x86emu *emu)
{
uint8_t port;
port = (uint8_t) fetch_byte_imm(emu);
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
(*emu->emu_outl) (emu, port, emu->x86.R_EAX);
} else {
(*emu->emu_outw) (emu, port, emu->x86.R_AX);
}
}
/*
* REMARKS:
* Handles opcode 0xe8
*/
static void
x86emuOp_call_near_IMM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
int32_t ip;
ip = (int32_t) fetch_long_imm(emu);
ip += (int32_t) emu->x86.R_EIP;
push_long(emu, emu->x86.R_EIP);
emu->x86.R_EIP = ip;
} else {
int16_t ip;
ip = (int16_t) fetch_word_imm(emu);
ip += (int16_t) emu->x86.R_IP; /* CHECK SIGN */
push_word(emu, emu->x86.R_IP);
emu->x86.R_IP = ip;
}
}
/*
* REMARKS:
* Handles opcode 0xe9
*/
static void
x86emuOp_jump_near_IMM(struct x86emu *emu)
{
int ip;
ip = (int16_t) fetch_word_imm(emu);
ip += (int16_t) emu->x86.R_IP;
emu->x86.R_IP = (uint16_t) ip;
}
/*
* REMARKS:
* Handles opcode 0xea
*/
static void
x86emuOp_jump_far_IMM(struct x86emu *emu)
{
uint16_t cs, ip;
ip = fetch_word_imm(emu);
cs = fetch_word_imm(emu);
emu->x86.R_IP = ip;
emu->x86.R_CS = cs;
}
/*
* REMARKS:
* Handles opcode 0xeb
*/
static void
x86emuOp_jump_byte_IMM(struct x86emu *emu)
{
uint16_t target;
int8_t offset;
offset = (int8_t) fetch_byte_imm(emu);
target = (uint16_t) (emu->x86.R_IP + offset);
emu->x86.R_IP = target;
}
/*
* REMARKS:
* Handles opcode 0xec
*/
static void
x86emuOp_in_byte_AL_DX(struct x86emu *emu)
{
emu->x86.R_AL = (*emu->emu_inb) (emu, emu->x86.R_DX);
}
/*
* REMARKS:
* Handles opcode 0xed
*/
static void
x86emuOp_in_word_AX_DX(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_EAX = (*emu->emu_inl) (emu, emu->x86.R_DX);
} else {
emu->x86.R_AX = (*emu->emu_inw) (emu, emu->x86.R_DX);
}
}
/*
* REMARKS:
* Handles opcode 0xee
*/
static void
x86emuOp_out_byte_DX_AL(struct x86emu *emu)
{
(*emu->emu_outb) (emu, emu->x86.R_DX, emu->x86.R_AL);
}
/*
* REMARKS:
* Handles opcode 0xef
*/
static void
x86emuOp_out_word_DX_AX(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
(*emu->emu_outl) (emu, emu->x86.R_DX, emu->x86.R_EAX);
} else {
(*emu->emu_outw) (emu, emu->x86.R_DX, emu->x86.R_AX);
}
}
/*
* REMARKS:
* Handles opcode 0xf0
*/
static void
x86emuOp_lock(struct x86emu *emu)
{
}
/*opcode 0xf1 ILLEGAL OPERATION */
/*
* REMARKS:
* Handles opcode 0xf5
*/
static void
x86emuOp_cmc(struct x86emu *emu)
{
if (ACCESS_FLAG(F_CF))
CLEAR_FLAG(F_CF);
else
SET_FLAG(F_CF);
}
/*
* REMARKS:
* Handles opcode 0xf6
*/
static void
x86emuOp_opcF6_byte_RM(struct x86emu *emu)
{
uint8_t destval, srcval;
/* long, drawn out code follows. Double switch for a total of 32
* cases. */
fetch_decode_modrm(emu);
if (emu->cur_rh == 1)
x86emu_halt_sys(emu);
if (emu->cur_rh == 0) {
destval = decode_and_fetch_byte_imm8(emu, &srcval);
test_byte(emu, destval, srcval);
return;
}
destval = decode_and_fetch_byte(emu);
switch (emu->cur_rh) {
case 2:
destval = ~destval;
write_back_byte(emu, destval);
break;
case 3:
destval = neg_byte(emu, destval);
write_back_byte(emu, destval);
break;
case 4:
mul_byte(emu, destval);
break;
case 5:
imul_byte(emu, destval);
break;
case 6:
div_byte(emu, destval);
break;
case 7:
idiv_byte(emu, destval);
break;
}
}
/*
* REMARKS:
* Handles opcode 0xf7
*/
static void
x86emuOp32_opcF7_word_RM(struct x86emu *emu)
{
uint32_t destval, srcval;
/* long, drawn out code follows. Double switch for a total of 32
* cases. */
fetch_decode_modrm(emu);
if (emu->cur_rh == 1)
x86emu_halt_sys(emu);
if (emu->cur_rh == 0) {
if (emu->cur_mod != 3) {
uint32_t destoffset;
destoffset = decode_rl_address(emu);
srcval = fetch_long_imm(emu);
destval = fetch_data_long(emu, destoffset);
} else {
srcval = fetch_long_imm(emu);
destval = *decode_rl_long_register(emu);
}
test_long(emu, destval, srcval);
return;
}
destval = decode_and_fetch_long(emu);
switch (emu->cur_rh) {
case 2:
destval = ~destval;
write_back_long(emu, destval);
break;
case 3:
destval = neg_long(emu, destval);
write_back_long(emu, destval);
break;
case 4:
mul_long(emu, destval);
break;
case 5:
imul_long(emu, destval);
break;
case 6:
div_long(emu, destval);
break;
case 7:
idiv_long(emu, destval);
break;
}
}
static void
x86emuOp16_opcF7_word_RM(struct x86emu *emu)
{
uint16_t destval, srcval;
/* long, drawn out code follows. Double switch for a total of 32
* cases. */
fetch_decode_modrm(emu);
if (emu->cur_rh == 1)
x86emu_halt_sys(emu);
if (emu->cur_rh == 0) {
if (emu->cur_mod != 3) {
uint32_t destoffset;
destoffset = decode_rl_address(emu);
srcval = fetch_word_imm(emu);
destval = fetch_data_word(emu, destoffset);
} else {
srcval = fetch_word_imm(emu);
destval = *decode_rl_word_register(emu);
}
test_word(emu, destval, srcval);
return;
}
destval = decode_and_fetch_word(emu);
switch (emu->cur_rh) {
case 2:
destval = ~destval;
write_back_word(emu, destval);
break;
case 3:
destval = neg_word(emu, destval);
write_back_word(emu, destval);
break;
case 4:
mul_word(emu, destval);
break;
case 5:
imul_word(emu, destval);
break;
case 6:
div_word(emu, destval);
break;
case 7:
idiv_word(emu, destval);
break;
}
}
static void
x86emuOp_opcF7_word_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_opcF7_word_RM(emu);
else
x86emuOp16_opcF7_word_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0xfe
*/
static void
x86emuOp_opcFE_byte_RM(struct x86emu *emu)
{
uint8_t destval;
uint32_t destoffset;
uint8_t *destreg;
/* Yet another special case instruction. */
fetch_decode_modrm(emu);
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
switch (emu->cur_rh) {
case 0: /* inc word ptr ... */
destval = fetch_data_byte(emu, destoffset);
destval = inc_byte(emu, destval);
store_data_byte(emu, destoffset, destval);
break;
case 1: /* dec word ptr ... */
destval = fetch_data_byte(emu, destoffset);
destval = dec_byte(emu, destval);
store_data_byte(emu, destoffset, destval);
break;
}
} else {
destreg = decode_rl_byte_register(emu);
switch (emu->cur_rh) {
case 0:
*destreg = inc_byte(emu, *destreg);
break;
case 1:
*destreg = dec_byte(emu, *destreg);
break;
}
}
}
/*
* REMARKS:
* Handles opcode 0xff
*/
static void
x86emuOp32_opcFF_word_RM(struct x86emu *emu)
{
uint32_t destoffset = 0;
uint32_t destval, *destreg;
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_long(emu, destoffset);
switch (emu->cur_rh) {
case 0: /* inc word ptr ... */
destval = inc_long(emu, destval);
store_data_long(emu, destoffset, destval);
break;
case 1: /* dec word ptr ... */
destval = dec_long(emu, destval);
store_data_long(emu, destoffset, destval);
break;
case 6: /* push word ptr ... */
push_long(emu, destval);
break;
}
} else {
destreg = decode_rl_long_register(emu);
switch (emu->cur_rh) {
case 0:
*destreg = inc_long(emu, *destreg);
break;
case 1:
*destreg = dec_long(emu, *destreg);
break;
case 6:
push_long(emu, *destreg);
break;
}
}
}
static void
x86emuOp16_opcFF_word_RM(struct x86emu *emu)
{
uint32_t destoffset = 0;
uint16_t *destreg;
uint16_t destval;
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_word(emu, destoffset);
switch (emu->cur_rh) {
case 0:
destval = inc_word(emu, destval);
store_data_word(emu, destoffset, destval);
break;
case 1: /* dec word ptr ... */
destval = dec_word(emu, destval);
store_data_word(emu, destoffset, destval);
break;
case 6: /* push word ptr ... */
push_word(emu, destval);
break;
}
} else {
destreg = decode_rl_word_register(emu);
switch (emu->cur_rh) {
case 0:
*destreg = inc_word(emu, *destreg);
break;
case 1:
*destreg = dec_word(emu, *destreg);
break;
case 6:
push_word(emu, *destreg);
break;
}
}
}
static void
x86emuOp_opcFF_word_RM(struct x86emu *emu)
{
uint32_t destoffset = 0;
uint16_t destval, destval2;
/* Yet another special case instruction. */
fetch_decode_modrm(emu);
if ((emu->cur_mod == 3 && (emu->cur_rh == 3 || emu->cur_rh == 5)) ||
emu->cur_rh == 7)
x86emu_halt_sys(emu);
if (emu->cur_rh == 0 || emu->cur_rh == 1 || emu->cur_rh == 6) {
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp32_opcFF_word_RM(emu);
else
x86emuOp16_opcFF_word_RM(emu);
return;
}
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
destval = fetch_data_word(emu, destoffset);
switch (emu->cur_rh) {
case 3: /* call far ptr ... */
destval2 = fetch_data_word(emu, destoffset + 2);
push_word(emu, emu->x86.R_CS);
emu->x86.R_CS = destval2;
push_word(emu, emu->x86.R_IP);
emu->x86.R_IP = destval;
break;
case 5: /* jmp far ptr ... */
destval2 = fetch_data_word(emu, destoffset + 2);
emu->x86.R_IP = destval;
emu->x86.R_CS = destval2;
break;
}
} else {
destval = *decode_rl_word_register(emu);
}
switch (emu->cur_rh) {
case 2: /* call word ptr */
push_word(emu, emu->x86.R_IP);
emu->x86.R_IP = destval;
break;
case 4: /* jmp */
emu->x86.R_IP = destval;
break;
}
}
/*
* * Single byte operation code table:
*/
static void
x86emu_exec_one_byte(struct x86emu * emu)
{
uint8_t op1;
op1 = fetch_byte_imm(emu);
switch (op1) {
case 0x00:
common_binop_byte_rm_r(emu, add_byte);
break;
case 0x01:
common_binop_word_long_rm_r(emu, add_word, add_long);
break;
case 0x02:
common_binop_byte_r_rm(emu, add_byte);
break;
case 0x03:
common_binop_word_long_r_rm(emu, add_word, add_long);
break;
case 0x04:
common_binop_byte_imm(emu, add_byte);
break;
case 0x05:
common_binop_word_long_imm(emu, add_word, add_long);
break;
case 0x06:
push_word(emu, emu->x86.R_ES);
break;
case 0x07:
emu->x86.R_ES = pop_word(emu);
break;
case 0x08:
common_binop_byte_rm_r(emu, or_byte);
break;
case 0x09:
common_binop_word_long_rm_r(emu, or_word, or_long);
break;
case 0x0a:
common_binop_byte_r_rm(emu, or_byte);
break;
case 0x0b:
common_binop_word_long_r_rm(emu, or_word, or_long);
break;
case 0x0c:
common_binop_byte_imm(emu, or_byte);
break;
case 0x0d:
common_binop_word_long_imm(emu, or_word, or_long);
break;
case 0x0e:
push_word(emu, emu->x86.R_CS);
break;
case 0x0f:
x86emu_exec_two_byte(emu);
break;
case 0x10:
common_binop_byte_rm_r(emu, adc_byte);
break;
case 0x11:
common_binop_word_long_rm_r(emu, adc_word, adc_long);
break;
case 0x12:
common_binop_byte_r_rm(emu, adc_byte);
break;
case 0x13:
common_binop_word_long_r_rm(emu, adc_word, adc_long);
break;
case 0x14:
common_binop_byte_imm(emu, adc_byte);
break;
case 0x15:
common_binop_word_long_imm(emu, adc_word, adc_long);
break;
case 0x16:
push_word(emu, emu->x86.R_SS);
break;
case 0x17:
emu->x86.R_SS = pop_word(emu);
break;
case 0x18:
common_binop_byte_rm_r(emu, sbb_byte);
break;
case 0x19:
common_binop_word_long_rm_r(emu, sbb_word, sbb_long);
break;
case 0x1a:
common_binop_byte_r_rm(emu, sbb_byte);
break;
case 0x1b:
common_binop_word_long_r_rm(emu, sbb_word, sbb_long);
break;
case 0x1c:
common_binop_byte_imm(emu, sbb_byte);
break;
case 0x1d:
common_binop_word_long_imm(emu, sbb_word, sbb_long);
break;
case 0x1e:
push_word(emu, emu->x86.R_DS);
break;
case 0x1f:
emu->x86.R_DS = pop_word(emu);
break;
case 0x20:
common_binop_byte_rm_r(emu, and_byte);
break;
case 0x21:
common_binop_word_long_rm_r(emu, and_word, and_long);
break;
case 0x22:
common_binop_byte_r_rm(emu, and_byte);
break;
case 0x23:
common_binop_word_long_r_rm(emu, and_word, and_long);
break;
case 0x24:
common_binop_byte_imm(emu, and_byte);
break;
case 0x25:
common_binop_word_long_imm(emu, and_word, and_long);
break;
case 0x26:
emu->x86.mode |= SYSMODE_SEGOVR_ES;
break;
case 0x27:
emu->x86.R_AL = daa_byte(emu, emu->x86.R_AL);
break;
case 0x28:
common_binop_byte_rm_r(emu, sub_byte);
break;
case 0x29:
common_binop_word_long_rm_r(emu, sub_word, sub_long);
break;
case 0x2a:
common_binop_byte_r_rm(emu, sub_byte);
break;
case 0x2b:
common_binop_word_long_r_rm(emu, sub_word, sub_long);
break;
case 0x2c:
common_binop_byte_imm(emu, sub_byte);
break;
case 0x2d:
common_binop_word_long_imm(emu, sub_word, sub_long);
break;
case 0x2e:
emu->x86.mode |= SYSMODE_SEGOVR_CS;
break;
case 0x2f:
emu->x86.R_AL = das_byte(emu, emu->x86.R_AL);
break;
case 0x30:
common_binop_byte_rm_r(emu, xor_byte);
break;
case 0x31:
common_binop_word_long_rm_r(emu, xor_word, xor_long);
break;
case 0x32:
common_binop_byte_r_rm(emu, xor_byte);
break;
case 0x33:
common_binop_word_long_r_rm(emu, xor_word, xor_long);
break;
case 0x34:
common_binop_byte_imm(emu, xor_byte);
break;
case 0x35:
common_binop_word_long_imm(emu, xor_word, xor_long);
break;
case 0x36:
emu->x86.mode |= SYSMODE_SEGOVR_SS;
break;
case 0x37:
emu->x86.R_AX = aaa_word(emu, emu->x86.R_AX);
break;
case 0x38:
common_binop_ns_byte_rm_r(emu, cmp_byte_no_return);
break;
case 0x39:
common_binop_ns_word_long_rm_r(emu, cmp_word_no_return,
cmp_long_no_return);
break;
case 0x3a:
x86emuOp_cmp_byte_R_RM(emu);
break;
case 0x3b:
x86emuOp_cmp_word_R_RM(emu);
break;
case 0x3c:
x86emuOp_cmp_byte_AL_IMM(emu);
break;
case 0x3d:
x86emuOp_cmp_word_AX_IMM(emu);
break;
case 0x3e:
emu->x86.mode |= SYSMODE_SEGOVR_DS;
break;
case 0x3f:
emu->x86.R_AX = aas_word(emu, emu->x86.R_AX);
break;
case 0x40:
common_inc_word_long(emu, &emu->x86.register_a);
break;
case 0x41:
common_inc_word_long(emu, &emu->x86.register_c);
break;
case 0x42:
common_inc_word_long(emu, &emu->x86.register_d);
break;
case 0x43:
common_inc_word_long(emu, &emu->x86.register_b);
break;
case 0x44:
common_inc_word_long(emu, &emu->x86.register_sp);
break;
case 0x45:
common_inc_word_long(emu, &emu->x86.register_bp);
break;
case 0x46:
common_inc_word_long(emu, &emu->x86.register_si);
break;
case 0x47:
common_inc_word_long(emu, &emu->x86.register_di);
break;
case 0x48:
common_dec_word_long(emu, &emu->x86.register_a);
break;
case 0x49:
common_dec_word_long(emu, &emu->x86.register_c);
break;
case 0x4a:
common_dec_word_long(emu, &emu->x86.register_d);
break;
case 0x4b:
common_dec_word_long(emu, &emu->x86.register_b);
break;
case 0x4c:
common_dec_word_long(emu, &emu->x86.register_sp);
break;
case 0x4d:
common_dec_word_long(emu, &emu->x86.register_bp);
break;
case 0x4e:
common_dec_word_long(emu, &emu->x86.register_si);
break;
case 0x4f:
common_dec_word_long(emu, &emu->x86.register_di);
break;
case 0x50:
common_push_word_long(emu, &emu->x86.register_a);
break;
case 0x51:
common_push_word_long(emu, &emu->x86.register_c);
break;
case 0x52:
common_push_word_long(emu, &emu->x86.register_d);
break;
case 0x53:
common_push_word_long(emu, &emu->x86.register_b);
break;
case 0x54:
common_push_word_long(emu, &emu->x86.register_sp);
break;
case 0x55:
common_push_word_long(emu, &emu->x86.register_bp);
break;
case 0x56:
common_push_word_long(emu, &emu->x86.register_si);
break;
case 0x57:
common_push_word_long(emu, &emu->x86.register_di);
break;
case 0x58:
common_pop_word_long(emu, &emu->x86.register_a);
break;
case 0x59:
common_pop_word_long(emu, &emu->x86.register_c);
break;
case 0x5a:
common_pop_word_long(emu, &emu->x86.register_d);
break;
case 0x5b:
common_pop_word_long(emu, &emu->x86.register_b);
break;
case 0x5c:
common_pop_word_long(emu, &emu->x86.register_sp);
break;
case 0x5d:
common_pop_word_long(emu, &emu->x86.register_bp);
break;
case 0x5e:
common_pop_word_long(emu, &emu->x86.register_si);
break;
case 0x5f:
common_pop_word_long(emu, &emu->x86.register_di);
break;
case 0x60:
x86emuOp_push_all(emu);
break;
case 0x61:
x86emuOp_pop_all(emu);
break;
/* 0x62 bound */
/* 0x63 arpl */
case 0x64:
emu->x86.mode |= SYSMODE_SEGOVR_FS;
break;
case 0x65:
emu->x86.mode |= SYSMODE_SEGOVR_GS;
break;
case 0x66:
emu->x86.mode |= SYSMODE_PREFIX_DATA;
break;
case 0x67:
emu->x86.mode |= SYSMODE_PREFIX_ADDR;
break;
case 0x68:
x86emuOp_push_word_IMM(emu);
break;
case 0x69:
common_imul_imm(emu, 0);
break;
case 0x6a:
x86emuOp_push_byte_IMM(emu);
break;
case 0x6b:
common_imul_imm(emu, 1);
break;
case 0x6c:
ins(emu, 1);
break;
case 0x6d:
x86emuOp_ins_word(emu);
break;
case 0x6e:
outs(emu, 1);
break;
case 0x6f:
x86emuOp_outs_word(emu);
break;
case 0x70:
common_jmp_near(emu, ACCESS_FLAG(F_OF));
break;
case 0x71:
common_jmp_near(emu, !ACCESS_FLAG(F_OF));
break;
case 0x72:
common_jmp_near(emu, ACCESS_FLAG(F_CF));
break;
case 0x73:
common_jmp_near(emu, !ACCESS_FLAG(F_CF));
break;
case 0x74:
common_jmp_near(emu, ACCESS_FLAG(F_ZF));
break;
case 0x75:
common_jmp_near(emu, !ACCESS_FLAG(F_ZF));
break;
case 0x76:
common_jmp_near(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF));
break;
case 0x77:
common_jmp_near(emu, !ACCESS_FLAG(F_CF) && !ACCESS_FLAG(F_ZF));
break;
case 0x78:
common_jmp_near(emu, ACCESS_FLAG(F_SF));
break;
case 0x79:
common_jmp_near(emu, !ACCESS_FLAG(F_SF));
break;
case 0x7a:
common_jmp_near(emu, ACCESS_FLAG(F_PF));
break;
case 0x7b:
common_jmp_near(emu, !ACCESS_FLAG(F_PF));
break;
case 0x7c:
x86emuOp_jump_near_L(emu);
break;
case 0x7d:
x86emuOp_jump_near_NL(emu);
break;
case 0x7e:
x86emuOp_jump_near_LE(emu);
break;
case 0x7f:
x86emuOp_jump_near_NLE(emu);
break;
case 0x80:
x86emuOp_opc80_byte_RM_IMM(emu);
break;
case 0x81:
x86emuOp_opc81_word_RM_IMM(emu);
break;
case 0x82:
x86emuOp_opc82_byte_RM_IMM(emu);
break;
case 0x83:
x86emuOp_opc83_word_RM_IMM(emu);
break;
case 0x84:
common_binop_ns_byte_rm_r(emu, test_byte);
break;
case 0x85:
common_binop_ns_word_long_rm_r(emu, test_word, test_long);
break;
case 0x86:
x86emuOp_xchg_byte_RM_R(emu);
break;
case 0x87:
x86emuOp_xchg_word_RM_R(emu);
break;
case 0x88:
x86emuOp_mov_byte_RM_R(emu);
break;
case 0x89:
x86emuOp_mov_word_RM_R(emu);
break;
case 0x8a:
x86emuOp_mov_byte_R_RM(emu);
break;
case 0x8b:
x86emuOp_mov_word_R_RM(emu);
break;
case 0x8c:
x86emuOp_mov_word_RM_SR(emu);
break;
case 0x8d:
x86emuOp_lea_word_R_M(emu);
break;
case 0x8e:
x86emuOp_mov_word_SR_RM(emu);
break;
case 0x8f:
x86emuOp_pop_RM(emu);
break;
case 0x90:
/* nop */
break;
case 0x91:
x86emuOp_xchg_word_AX_CX(emu);
break;
case 0x92:
x86emuOp_xchg_word_AX_DX(emu);
break;
case 0x93:
x86emuOp_xchg_word_AX_BX(emu);
break;
case 0x94:
x86emuOp_xchg_word_AX_SP(emu);
break;
case 0x95:
x86emuOp_xchg_word_AX_BP(emu);
break;
case 0x96:
x86emuOp_xchg_word_AX_SI(emu);
break;
case 0x97:
x86emuOp_xchg_word_AX_DI(emu);
break;
case 0x98:
x86emuOp_cbw(emu);
break;
case 0x99:
x86emuOp_cwd(emu);
break;
case 0x9a:
x86emuOp_call_far_IMM(emu);
break;
case 0x9b:
/* wait */
break;
case 0x9c:
x86emuOp_pushf_word(emu);
break;
case 0x9d:
x86emuOp_popf_word(emu);
break;
case 0x9e:
x86emuOp_sahf(emu);
break;
case 0x9f:
x86emuOp_lahf(emu);
break;
case 0xa0:
x86emuOp_mov_AL_M_IMM(emu);
break;
case 0xa1:
x86emuOp_mov_AX_M_IMM(emu);
break;
case 0xa2:
x86emuOp_mov_M_AL_IMM(emu);
break;
case 0xa3:
x86emuOp_mov_M_AX_IMM(emu);
break;
case 0xa4:
x86emuOp_movs_byte(emu);
break;
case 0xa5:
x86emuOp_movs_word(emu);
break;
case 0xa6:
x86emuOp_cmps_byte(emu);
break;
case 0xa7:
x86emuOp_cmps_word(emu);
break;
case 0xa8:
test_byte(emu, emu->x86.R_AL, fetch_byte_imm(emu));
break;
case 0xa9:
x86emuOp_test_AX_IMM(emu);
break;
case 0xaa:
x86emuOp_stos_byte(emu);
break;
case 0xab:
x86emuOp_stos_word(emu);
break;
case 0xac:
x86emuOp_lods_byte(emu);
break;
case 0xad:
x86emuOp_lods_word(emu);
break;
case 0xae:
x86emuOp_scas_byte(emu);
break;
case 0xaf:
x86emuOp_scas_word(emu);
break;
case 0xb0:
emu->x86.R_AL = fetch_byte_imm(emu);
break;
case 0xb1:
emu->x86.R_CL = fetch_byte_imm(emu);
break;
case 0xb2:
emu->x86.R_DL = fetch_byte_imm(emu);
break;
case 0xb3:
emu->x86.R_BL = fetch_byte_imm(emu);
break;
case 0xb4:
emu->x86.R_AH = fetch_byte_imm(emu);
break;
case 0xb5:
emu->x86.R_CH = fetch_byte_imm(emu);
break;
case 0xb6:
emu->x86.R_DH = fetch_byte_imm(emu);
break;
case 0xb7:
emu->x86.R_BH = fetch_byte_imm(emu);
break;
case 0xb8:
x86emuOp_mov_word_AX_IMM(emu);
break;
case 0xb9:
x86emuOp_mov_word_CX_IMM(emu);
break;
case 0xba:
x86emuOp_mov_word_DX_IMM(emu);
break;
case 0xbb:
x86emuOp_mov_word_BX_IMM(emu);
break;
case 0xbc:
x86emuOp_mov_word_SP_IMM(emu);
break;
case 0xbd:
x86emuOp_mov_word_BP_IMM(emu);
break;
case 0xbe:
x86emuOp_mov_word_SI_IMM(emu);
break;
case 0xbf:
x86emuOp_mov_word_DI_IMM(emu);
break;
case 0xc0:
x86emuOp_opcC0_byte_RM_MEM(emu);
break;
case 0xc1:
x86emuOp_opcC1_word_RM_MEM(emu);
break;
case 0xc2:
x86emuOp_ret_near_IMM(emu);
break;
case 0xc3:
emu->x86.R_IP = pop_word(emu);
break;
case 0xc4:
common_load_far_pointer(emu, &emu->x86.R_ES);
break;
case 0xc5:
common_load_far_pointer(emu, &emu->x86.R_DS);
break;
case 0xc6:
x86emuOp_mov_byte_RM_IMM(emu);
break;
case 0xc7:
x86emuOp_mov_word_RM_IMM(emu);
break;
case 0xc8:
x86emuOp_enter(emu);
break;
case 0xc9:
x86emuOp_leave(emu);
break;
case 0xca:
x86emuOp_ret_far_IMM(emu);
break;
case 0xcb:
x86emuOp_ret_far(emu);
break;
case 0xcc:
x86emuOp_int3(emu);
break;
case 0xcd:
x86emuOp_int_IMM(emu);
break;
case 0xce:
x86emuOp_into(emu);
break;
case 0xcf:
x86emuOp_iret(emu);
break;
case 0xd0:
x86emuOp_opcD0_byte_RM_1(emu);
break;
case 0xd1:
x86emuOp_opcD1_word_RM_1(emu);
break;
case 0xd2:
x86emuOp_opcD2_byte_RM_CL(emu);
break;
case 0xd3:
x86emuOp_opcD3_word_RM_CL(emu);
break;
case 0xd4:
x86emuOp_aam(emu);
break;
case 0xd5:
x86emuOp_aad(emu);
break;
/* 0xd6 Undocumented SETALC instruction */
case 0xd7:
x86emuOp_xlat(emu);
break;
case 0xd8:
x86emuOp_esc_coprocess_d8(emu);
break;
case 0xd9:
x86emuOp_esc_coprocess_d9(emu);
break;
case 0xda:
x86emuOp_esc_coprocess_da(emu);
break;
case 0xdb:
x86emuOp_esc_coprocess_db(emu);
break;
case 0xdc:
x86emuOp_esc_coprocess_dc(emu);
break;
case 0xdd:
x86emuOp_esc_coprocess_dd(emu);
break;
case 0xde:
x86emuOp_esc_coprocess_de(emu);
break;
case 0xdf:
x86emuOp_esc_coprocess_df(emu);
break;
case 0xe0:
x86emuOp_loopne(emu);
break;
case 0xe1:
x86emuOp_loope(emu);
break;
case 0xe2:
x86emuOp_loop(emu);
break;
case 0xe3:
x86emuOp_jcxz(emu);
break;
case 0xe4:
x86emuOp_in_byte_AL_IMM(emu);
break;
case 0xe5:
x86emuOp_in_word_AX_IMM(emu);
break;
case 0xe6:
x86emuOp_out_byte_IMM_AL(emu);
break;
case 0xe7:
x86emuOp_out_word_IMM_AX(emu);
break;
case 0xe8:
x86emuOp_call_near_IMM(emu);
break;
case 0xe9:
x86emuOp_jump_near_IMM(emu);
break;
case 0xea:
x86emuOp_jump_far_IMM(emu);
break;
case 0xeb:
x86emuOp_jump_byte_IMM(emu);
break;
case 0xec:
x86emuOp_in_byte_AL_DX(emu);
break;
case 0xed:
x86emuOp_in_word_AX_DX(emu);
break;
case 0xee:
x86emuOp_out_byte_DX_AL(emu);
break;
case 0xef:
x86emuOp_out_word_DX_AX(emu);
break;
case 0xf0:
x86emuOp_lock(emu);
break;
case 0xf2:
emu->x86.mode |= SYSMODE_PREFIX_REPNE;
break;
case 0xf3:
emu->x86.mode |= SYSMODE_PREFIX_REPE;
break;
case 0xf4:
x86emu_halt_sys(emu);
break;
case 0xf5:
x86emuOp_cmc(emu);
break;
case 0xf6:
x86emuOp_opcF6_byte_RM(emu);
break;
case 0xf7:
x86emuOp_opcF7_word_RM(emu);
break;
case 0xf8:
CLEAR_FLAG(F_CF);
break;
case 0xf9:
SET_FLAG(F_CF);
break;
case 0xfa:
CLEAR_FLAG(F_IF);
break;
case 0xfb:
SET_FLAG(F_IF);
break;
case 0xfc:
CLEAR_FLAG(F_DF);
break;
case 0xfd:
SET_FLAG(F_DF);
break;
case 0xfe:
x86emuOp_opcFE_byte_RM(emu);
break;
case 0xff:
x86emuOp_opcFF_word_RM(emu);
break;
default:
x86emu_halt_sys(emu);
break;
}
if (op1 != 0x26 && op1 != 0x2e && op1 != 0x36 && op1 != 0x3e &&
(op1 | 3) != 0x67)
emu->x86.mode &= ~SYSMODE_CLRMASK;
}
static void
common_jmp_long(struct x86emu *emu, int cond)
{
int16_t target;
target = (int16_t) fetch_word_imm(emu);
target += (int16_t) emu->x86.R_IP;
if (cond)
emu->x86.R_IP = (uint16_t) target;
}
static void
common_set_byte(struct x86emu *emu, int cond)
{
uint32_t destoffset;
uint8_t *destreg, destval;
fetch_decode_modrm(emu);
destval = cond ? 0x01 : 0x00;
if (emu->cur_mod != 3) {
destoffset = decode_rl_address(emu);
store_data_byte(emu, destoffset, destval);
} else {
destreg = decode_rl_byte_register(emu);
*destreg = destval;
}
}
static void
common_bitstring32(struct x86emu *emu, int op)
{
int bit;
uint32_t srcval, *shiftreg, mask;
fetch_decode_modrm(emu);
shiftreg = decode_rh_long_register(emu);
srcval = decode_and_fetch_long_disp(emu, (int16_t) *shiftreg >> 5);
bit = *shiftreg & 0x1F;
mask = 0x1 << bit;
CONDITIONAL_SET_FLAG(srcval & mask, F_CF);
switch (op) {
case 0:
break;
case 1:
write_back_long(emu, srcval | mask);
break;
case 2:
write_back_long(emu, srcval & ~mask);
break;
case 3:
write_back_long(emu, srcval ^ mask);
break;
}
}
static void
common_bitstring16(struct x86emu *emu, int op)
{
int bit;
uint16_t srcval, *shiftreg, mask;
fetch_decode_modrm(emu);
shiftreg = decode_rh_word_register(emu);
srcval = decode_and_fetch_word_disp(emu, (int16_t) *shiftreg >> 4);
bit = *shiftreg & 0xF;
mask = 0x1 << bit;
CONDITIONAL_SET_FLAG(srcval & mask, F_CF);
switch (op) {
case 0:
break;
case 1:
write_back_word(emu, srcval | mask);
break;
case 2:
write_back_word(emu, srcval & ~mask);
break;
case 3:
write_back_word(emu, srcval ^ mask);
break;
}
}
static void
common_bitstring(struct x86emu *emu, int op)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_bitstring32(emu, op);
else
common_bitstring16(emu, op);
}
static void
common_bitsearch32(struct x86emu *emu, int diff)
{
uint32_t srcval, *dstreg;
fetch_decode_modrm(emu);
dstreg = decode_rh_long_register(emu);
srcval = decode_and_fetch_long(emu);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for (*dstreg = 0; *dstreg < 32; *dstreg += diff) {
if ((srcval >> *dstreg) & 1)
break;
}
}
static void
common_bitsearch16(struct x86emu *emu, int diff)
{
uint16_t srcval, *dstreg;
fetch_decode_modrm(emu);
dstreg = decode_rh_word_register(emu);
srcval = decode_and_fetch_word(emu);
CONDITIONAL_SET_FLAG(srcval == 0, F_ZF);
for (*dstreg = 0; *dstreg < 16; *dstreg += diff) {
if ((srcval >> *dstreg) & 1)
break;
}
}
static void
common_bitsearch(struct x86emu *emu, int diff)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_bitsearch32(emu, diff);
else
common_bitsearch16(emu, diff);
}
static void
common_shift32(struct x86emu *emu, int shift_left, int use_cl)
{
uint8_t shift;
uint32_t destval, *shiftreg;
fetch_decode_modrm(emu);
shiftreg = decode_rh_long_register(emu);
if (use_cl) {
destval = decode_and_fetch_long(emu);
shift = emu->x86.R_CL;
} else {
destval = decode_and_fetch_long_imm8(emu, &shift);
}
if (shift_left)
destval = shld_long(emu, destval, *shiftreg, shift);
else
destval = shrd_long(emu, destval, *shiftreg, shift);
write_back_long(emu, destval);
}
static void
common_shift16(struct x86emu *emu, int shift_left, int use_cl)
{
uint8_t shift;
uint16_t destval, *shiftreg;
fetch_decode_modrm(emu);
shiftreg = decode_rh_word_register(emu);
if (use_cl) {
destval = decode_and_fetch_word(emu);
shift = emu->x86.R_CL;
} else {
destval = decode_and_fetch_word_imm8(emu, &shift);
}
if (shift_left)
destval = shld_word(emu, destval, *shiftreg, shift);
else
destval = shrd_word(emu, destval, *shiftreg, shift);
write_back_word(emu, destval);
}
static void
common_shift(struct x86emu *emu, int shift_left, int use_cl)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
common_shift32(emu, shift_left, use_cl);
else
common_shift16(emu, shift_left, use_cl);
}
/*
* Implementation
*/
#define xorl(a,b) ((a) && !(b)) || (!(a) && (b))
/*
* REMARKS:
* Handles opcode 0x0f,0x31
*/
static void
x86emuOp2_rdtsc(struct x86emu *emu)
{
emu->x86.R_EAX = emu->cur_cycles & 0xffffffff;
emu->x86.R_EDX = emu->cur_cycles >> 32;
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa0
*/
static void
x86emuOp2_push_FS(struct x86emu *emu)
{
push_word(emu, emu->x86.R_FS);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa1
*/
static void
x86emuOp2_pop_FS(struct x86emu *emu)
{
emu->x86.R_FS = pop_word(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa1
*/
#if defined(__i386__) || defined(__amd64__)
static void
hw_cpuid(uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d)
{
__asm__ volatile("cpuid"
: "=a" (*a), "=b" (*b),
"=c" (*c), "=d" (*d)
: "a" (*a), "c" (*c)
: "cc");
}
#endif
static void
x86emuOp2_cpuid(struct x86emu *emu)
{
#if defined(__i386__) || defined(__amd64__)
hw_cpuid(&emu->x86.R_EAX, &emu->x86.R_EBX, &emu->x86.R_ECX,
&emu->x86.R_EDX);
#endif
switch (emu->x86.R_EAX) {
case 0:
emu->x86.R_EAX = 1;
#if !defined(__i386__) && !defined(__amd64__)
/* "GenuineIntel" */
emu->x86.R_EBX = 0x756e6547;
emu->x86.R_EDX = 0x49656e69;
emu->x86.R_ECX = 0x6c65746e;
#endif
break;
case 1:
#if !defined(__i386__) && !defined(__amd64__)
emu->x86.R_EAX = 0x00000480;
emu->x86.R_EBX = emu->x86.R_ECX = 0;
emu->x86.R_EDX = 0x00000002;
#else
emu->x86.R_EDX &= 0x00000012;
#endif
break;
default:
emu->x86.R_EAX = emu->x86.R_EBX = emu->x86.R_ECX =
emu->x86.R_EDX = 0;
break;
}
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa3
*/
static void
x86emuOp2_bt_R(struct x86emu *emu)
{
common_bitstring(emu, 0);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa4
*/
static void
x86emuOp2_shld_IMM(struct x86emu *emu)
{
common_shift(emu, 1, 0);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa5
*/
static void
x86emuOp2_shld_CL(struct x86emu *emu)
{
common_shift(emu, 1, 1);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa8
*/
static void
x86emuOp2_push_GS(struct x86emu *emu)
{
push_word(emu, emu->x86.R_GS);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xa9
*/
static void
x86emuOp2_pop_GS(struct x86emu *emu)
{
emu->x86.R_GS = pop_word(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xab
*/
static void
x86emuOp2_bts_R(struct x86emu *emu)
{
common_bitstring(emu, 1);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xac
*/
static void
x86emuOp2_shrd_IMM(struct x86emu *emu)
{
common_shift(emu, 0, 0);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xad
*/
static void
x86emuOp2_shrd_CL(struct x86emu *emu)
{
common_shift(emu, 0, 1);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xaf
*/
static void
x86emuOp2_32_imul_R_RM(struct x86emu *emu)
{
uint32_t *destreg, srcval;
uint64_t res;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
srcval = decode_and_fetch_long(emu);
res = (int32_t) *destreg * (int32_t)srcval;
if (res > 0xffffffff) {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
}
*destreg = (uint32_t) res;
}
static void
x86emuOp2_16_imul_R_RM(struct x86emu *emu)
{
uint16_t *destreg, srcval;
uint32_t res;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
srcval = decode_and_fetch_word(emu);
res = (int16_t) * destreg * (int16_t)srcval;
if (res > 0xFFFF) {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
}
*destreg = (uint16_t) res;
}
static void
x86emuOp2_imul_R_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp2_32_imul_R_RM(emu);
else
x86emuOp2_16_imul_R_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb2
*/
static void
x86emuOp2_lss_R_IMM(struct x86emu *emu)
{
common_load_far_pointer(emu, &emu->x86.R_SS);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb3
*/
static void
x86emuOp2_btr_R(struct x86emu *emu)
{
common_bitstring(emu, 2);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb4
*/
static void
x86emuOp2_lfs_R_IMM(struct x86emu *emu)
{
common_load_far_pointer(emu, &emu->x86.R_FS);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb5
*/
static void
x86emuOp2_lgs_R_IMM(struct x86emu *emu)
{
common_load_far_pointer(emu, &emu->x86.R_GS);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb6
*/
static void
x86emuOp2_32_movzx_byte_R_RM(struct x86emu *emu)
{
uint32_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
*destreg = decode_and_fetch_byte(emu);
}
static void
x86emuOp2_16_movzx_byte_R_RM(struct x86emu *emu)
{
uint16_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
*destreg = decode_and_fetch_byte(emu);
}
static void
x86emuOp2_movzx_byte_R_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp2_32_movzx_byte_R_RM(emu);
else
x86emuOp2_16_movzx_byte_R_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xb7
*/
static void
x86emuOp2_movzx_word_R_RM(struct x86emu *emu)
{
uint32_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
*destreg = decode_and_fetch_word(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xba
*/
static void
x86emuOp2_32_btX_I(struct x86emu *emu)
{
int bit;
uint32_t srcval, mask;
uint8_t shift;
fetch_decode_modrm(emu);
if (emu->cur_rh < 4)
x86emu_halt_sys(emu);
srcval = decode_and_fetch_long_imm8(emu, &shift);
bit = shift & 0x1F;
mask = (0x1 << bit);
switch (emu->cur_rh) {
case 5:
write_back_long(emu, srcval | mask);
break;
case 6:
write_back_long(emu, srcval & ~mask);
break;
case 7:
write_back_long(emu, srcval ^ mask);
break;
}
CONDITIONAL_SET_FLAG(srcval & mask, F_CF);
}
static void
x86emuOp2_16_btX_I(struct x86emu *emu)
{
int bit;
uint16_t srcval, mask;
uint8_t shift;
fetch_decode_modrm(emu);
if (emu->cur_rh < 4)
x86emu_halt_sys(emu);
srcval = decode_and_fetch_word_imm8(emu, &shift);
bit = shift & 0xF;
mask = (0x1 << bit);
switch (emu->cur_rh) {
case 5:
write_back_word(emu, srcval | mask);
break;
case 6:
write_back_word(emu, srcval & ~mask);
break;
case 7:
write_back_word(emu, srcval ^ mask);
break;
}
CONDITIONAL_SET_FLAG(srcval & mask, F_CF);
}
static void
x86emuOp2_btX_I(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp2_32_btX_I(emu);
else
x86emuOp2_16_btX_I(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xbb
*/
static void
x86emuOp2_btc_R(struct x86emu *emu)
{
common_bitstring(emu, 3);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xbc
*/
static void
x86emuOp2_bsf(struct x86emu *emu)
{
common_bitsearch(emu, +1);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xbd
*/
static void
x86emuOp2_bsr(struct x86emu *emu)
{
common_bitsearch(emu, -1);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xbe
*/
static void
x86emuOp2_32_movsx_byte_R_RM(struct x86emu *emu)
{
uint32_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
*destreg = (int32_t)(int8_t)decode_and_fetch_byte(emu);
}
static void
x86emuOp2_16_movsx_byte_R_RM(struct x86emu *emu)
{
uint16_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_word_register(emu);
*destreg = (int16_t)(int8_t)decode_and_fetch_byte(emu);
}
static void
x86emuOp2_movsx_byte_R_RM(struct x86emu *emu)
{
if (emu->x86.mode & SYSMODE_PREFIX_DATA)
x86emuOp2_32_movsx_byte_R_RM(emu);
else
x86emuOp2_16_movsx_byte_R_RM(emu);
}
/*
* REMARKS:
* Handles opcode 0x0f,0xbf
*/
static void
x86emuOp2_movsx_word_R_RM(struct x86emu *emu)
{
uint32_t *destreg;
fetch_decode_modrm(emu);
destreg = decode_rh_long_register(emu);
*destreg = (int32_t)(int16_t)decode_and_fetch_word(emu);
}
static void
x86emu_exec_two_byte(struct x86emu * emu)
{
uint8_t op2;
op2 = fetch_byte_imm(emu);
switch (op2) {
/* 0x00 Group F (ring 0 PM) */
/* 0x01 Group G (ring 0 PM) */
/* 0x02 lar (ring 0 PM) */
/* 0x03 lsl (ring 0 PM) */
/* 0x05 loadall (undocumented) */
/* 0x06 clts (ring 0 PM) */
/* 0x07 loadall (undocumented) */
/* 0x08 invd (ring 0 PM) */
/* 0x09 wbinvd (ring 0 PM) */
/* 0x20 mov reg32(op2); break;creg (ring 0 PM) */
/* 0x21 mov reg32(op2); break;dreg (ring 0 PM) */
/* 0x22 mov creg(op2); break;reg32 (ring 0 PM) */
/* 0x23 mov dreg(op2); break;reg32 (ring 0 PM) */
/* 0x24 mov reg32(op2); break;treg (ring 0 PM) */
/* 0x26 mov treg(op2); break;reg32 (ring 0 PM) */
case 0x31:
x86emuOp2_rdtsc(emu);
break;
case 0x80:
common_jmp_long(emu, ACCESS_FLAG(F_OF));
break;
case 0x81:
common_jmp_long(emu, !ACCESS_FLAG(F_OF));
break;
case 0x82:
common_jmp_long(emu, ACCESS_FLAG(F_CF));
break;
case 0x83:
common_jmp_long(emu, !ACCESS_FLAG(F_CF));
break;
case 0x84:
common_jmp_long(emu, ACCESS_FLAG(F_ZF));
break;
case 0x85:
common_jmp_long(emu, !ACCESS_FLAG(F_ZF));
break;
case 0x86:
common_jmp_long(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF));
break;
case 0x87:
common_jmp_long(emu, !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF)));
break;
case 0x88:
common_jmp_long(emu, ACCESS_FLAG(F_SF));
break;
case 0x89:
common_jmp_long(emu, !ACCESS_FLAG(F_SF));
break;
case 0x8a:
common_jmp_long(emu, ACCESS_FLAG(F_PF));
break;
case 0x8b:
common_jmp_long(emu, !ACCESS_FLAG(F_PF));
break;
case 0x8c:
common_jmp_long(emu, xorl(ACCESS_FLAG(F_SF),
ACCESS_FLAG(F_OF)));
break;
case 0x8d:
common_jmp_long(emu, !(xorl(ACCESS_FLAG(F_SF),
ACCESS_FLAG(F_OF))));
break;
case 0x8e:
common_jmp_long(emu, (xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF))
|| ACCESS_FLAG(F_ZF)));
break;
case 0x8f:
common_jmp_long(emu,
!(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
ACCESS_FLAG(F_ZF)));
break;
case 0x90:
common_set_byte(emu, ACCESS_FLAG(F_OF));
break;
case 0x91:
common_set_byte(emu, !ACCESS_FLAG(F_OF));
break;
case 0x92:
common_set_byte(emu, ACCESS_FLAG(F_CF));
break;
case 0x93:
common_set_byte(emu, !ACCESS_FLAG(F_CF));
break;
case 0x94:
common_set_byte(emu, ACCESS_FLAG(F_ZF));
break;
case 0x95:
common_set_byte(emu, !ACCESS_FLAG(F_ZF));
break;
case 0x96:
common_set_byte(emu, ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF));
break;
case 0x97:
common_set_byte(emu, !(ACCESS_FLAG(F_CF) || ACCESS_FLAG(F_ZF)));
break;
case 0x98:
common_set_byte(emu, ACCESS_FLAG(F_SF));
break;
case 0x99:
common_set_byte(emu, !ACCESS_FLAG(F_SF));
break;
case 0x9a:
common_set_byte(emu, ACCESS_FLAG(F_PF));
break;
case 0x9b:
common_set_byte(emu, !ACCESS_FLAG(F_PF));
break;
case 0x9c:
common_set_byte(emu, xorl(ACCESS_FLAG(F_SF),
ACCESS_FLAG(F_OF)));
break;
case 0x9d:
common_set_byte(emu, xorl(ACCESS_FLAG(F_SF),
ACCESS_FLAG(F_OF)));
break;
case 0x9e:
common_set_byte(emu,
(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
ACCESS_FLAG(F_ZF)));
break;
case 0x9f:
common_set_byte(emu,
!(xorl(ACCESS_FLAG(F_SF), ACCESS_FLAG(F_OF)) ||
ACCESS_FLAG(F_ZF)));
break;
case 0xa0:
x86emuOp2_push_FS(emu);
break;
case 0xa1:
x86emuOp2_pop_FS(emu);
break;
case 0xa2:
x86emuOp2_cpuid(emu);
break;
case 0xa3:
x86emuOp2_bt_R(emu);
break;
case 0xa4:
x86emuOp2_shld_IMM(emu);
break;
case 0xa5:
x86emuOp2_shld_CL(emu);
break;
case 0xa8:
x86emuOp2_push_GS(emu);
break;
case 0xa9:
x86emuOp2_pop_GS(emu);
break;
case 0xab:
x86emuOp2_bts_R(emu);
break;
case 0xac:
x86emuOp2_shrd_IMM(emu);
break;
case 0xad:
x86emuOp2_shrd_CL(emu);
break;
case 0xaf:
x86emuOp2_imul_R_RM(emu);
break;
/* 0xb0 TODO: cmpxchg */
/* 0xb1 TODO: cmpxchg */
case 0xb2:
x86emuOp2_lss_R_IMM(emu);
break;
case 0xb3:
x86emuOp2_btr_R(emu);
break;
case 0xb4:
x86emuOp2_lfs_R_IMM(emu);
break;
case 0xb5:
x86emuOp2_lgs_R_IMM(emu);
break;
case 0xb6:
x86emuOp2_movzx_byte_R_RM(emu);
break;
case 0xb7:
x86emuOp2_movzx_word_R_RM(emu);
break;
case 0xba:
x86emuOp2_btX_I(emu);
break;
case 0xbb:
x86emuOp2_btc_R(emu);
break;
case 0xbc:
x86emuOp2_bsf(emu);
break;
case 0xbd:
x86emuOp2_bsr(emu);
break;
case 0xbe:
x86emuOp2_movsx_byte_R_RM(emu);
break;
case 0xbf:
x86emuOp2_movsx_word_R_RM(emu);
break;
/* 0xc0 TODO: xadd */
/* 0xc1 TODO: xadd */
/* 0xc8 TODO: bswap */
/* 0xc9 TODO: bswap */
/* 0xca TODO: bswap */
/* 0xcb TODO: bswap */
/* 0xcc TODO: bswap */
/* 0xcd TODO: bswap */
/* 0xce TODO: bswap */
/* 0xcf TODO: bswap */
default:
x86emu_halt_sys(emu);
break;
}
}
/*
* Carry Chain Calculation
*
* This represents a somewhat expensive calculation which is
* apparently required to emulate the setting of the OF and AF flag.
* The latter is not so important, but the former is. The overflow
* flag is the XOR of the top two bits of the carry chain for an
* addition (similar for subtraction). Since we do not want to
* simulate the addition in a bitwise manner, we try to calculate the
* carry chain given the two operands and the result.
*
* So, given the following table, which represents the addition of two
* bits, we can derive a formula for the carry chain.
*
* a b cin r cout
* 0 0 0 0 0
* 0 0 1 1 0
* 0 1 0 1 0
* 0 1 1 0 1
* 1 0 0 1 0
* 1 0 1 0 1
* 1 1 0 0 1
* 1 1 1 1 1
*
* Construction of table for cout:
*
* ab
* r \ 00 01 11 10
* |------------------
* 0 | 0 1 1 1
* 1 | 0 0 1 0
*
* By inspection, one gets: cc = ab + r'(a + b)
*
* That represents alot of operations, but NO CHOICE....
*
* Borrow Chain Calculation.
*
* The following table represents the subtraction of two bits, from
* which we can derive a formula for the borrow chain.
*
* a b bin r bout
* 0 0 0 0 0
* 0 0 1 1 1
* 0 1 0 1 1
* 0 1 1 0 1
* 1 0 0 1 0
* 1 0 1 0 0
* 1 1 0 0 0
* 1 1 1 1 1
*
* Construction of table for cout:
*
* ab
* r \ 00 01 11 10
* |------------------
* 0 | 0 1 0 0
* 1 | 1 1 1 0
*
* By inspection, one gets: bc = a'b + r(a' + b)
*
*/
/*
* Global Variables
*/
static uint32_t x86emu_parity_tab[8] =
{
0x96696996,
0x69969669,
0x69969669,
0x96696996,
0x69969669,
0x96696996,
0x96696996,
0x69969669,
};
#define PARITY(x) (((x86emu_parity_tab[(x) / 32] >> ((x) % 32)) & 1) == 0)
#define XOR2(x) (((x) ^ ((x)>>1)) & 0x1)
/*
* REMARKS:
* Implements the AAA instruction and side effects.
*/
static uint16_t
aaa_word(struct x86emu *emu, uint16_t d)
{
uint16_t res;
if ((d & 0xf) > 0x9 || ACCESS_FLAG(F_AF)) {
d += 0x6;
d += 0x100;
SET_FLAG(F_AF);
SET_FLAG(F_CF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
}
res = (uint16_t) (d & 0xFF0F);
CLEAR_FLAG(F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the AAA instruction and side effects.
*/
static uint16_t
aas_word(struct x86emu *emu, uint16_t d)
{
uint16_t res;
if ((d & 0xf) > 0x9 || ACCESS_FLAG(F_AF)) {
d -= 0x6;
d -= 0x100;
SET_FLAG(F_AF);
SET_FLAG(F_CF);
} else {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
}
res = (uint16_t) (d & 0xFF0F);
CLEAR_FLAG(F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the AAD instruction and side effects.
*/
static uint16_t
aad_word(struct x86emu *emu, uint16_t d)
{
uint16_t l;
uint8_t hb, lb;
hb = (uint8_t) ((d >> 8) & 0xff);
lb = (uint8_t) ((d & 0xff));
l = (uint16_t) ((lb + 10 * hb) & 0xFF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(l & 0x80, F_SF);
CONDITIONAL_SET_FLAG(l == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(l & 0xff), F_PF);
return l;
}
/*
* REMARKS:
* Implements the AAM instruction and side effects.
*/
static uint16_t
aam_word(struct x86emu *emu, uint8_t d)
{
uint16_t h, l;
h = (uint16_t) (d / 10);
l = (uint16_t) (d % 10);
l |= (uint16_t) (h << 8);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(l & 0x80, F_SF);
CONDITIONAL_SET_FLAG(l == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(l & 0xff), F_PF);
return l;
}
/*
* REMARKS:
* Implements the ADC instruction and side effects.
*/
static uint8_t
adc_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
if (ACCESS_FLAG(F_CF))
res = 1 + d + s;
else
res = d + s;
CONDITIONAL_SET_FLAG(res & 0x100, F_CF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the ADC instruction and side effects.
*/
static uint16_t
adc_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
if (ACCESS_FLAG(F_CF))
res = 1 + d + s;
else
res = d + s;
CONDITIONAL_SET_FLAG(res & 0x10000, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the ADC instruction and side effects.
*/
static uint32_t
adc_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t lo; /* all operands in native machine order */
uint32_t hi;
uint32_t res;
uint32_t cc;
if (ACCESS_FLAG(F_CF)) {
lo = 1 + (d & 0xFFFF) + (s & 0xFFFF);
res = 1 + d + s;
} else {
lo = (d & 0xFFFF) + (s & 0xFFFF);
res = d + s;
}
hi = (lo >> 16) + (d >> 16) + (s >> 16);
CONDITIONAL_SET_FLAG(hi & 0x10000, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the ADD instruction and side effects.
*/
static uint8_t
add_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
res = d + s;
CONDITIONAL_SET_FLAG(res & 0x100, F_CF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the ADD instruction and side effects.
*/
static uint16_t
add_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
res = d + s;
CONDITIONAL_SET_FLAG(res & 0x10000, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the ADD instruction and side effects.
*/
static uint32_t
add_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t lo; /* all operands in native machine order */
uint32_t hi;
uint32_t res;
uint32_t cc;
lo = (d & 0xFFFF) + (s & 0xFFFF);
res = d + s;
hi = (lo >> 16) + (d >> 16) + (s >> 16);
CONDITIONAL_SET_FLAG(hi & 0x10000, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (s & d) | ((~res) & (s | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the AND instruction and side effects.
*/
static uint8_t
and_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint8_t res; /* all operands in native machine order */
res = d & s;
/* set the flags */
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res), F_PF);
return res;
}
/*
* REMARKS:
* Implements the AND instruction and side effects.
*/
static uint16_t
and_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint16_t res; /* all operands in native machine order */
res = d & s;
/* set the flags */
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the AND instruction and side effects.
*/
static uint32_t
and_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
res = d & s;
/* set the flags */
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the CMP instruction and side effects.
*/
static uint8_t
cmp_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CLEAR_FLAG(F_CF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return d;
}
static void
cmp_byte_no_return(struct x86emu *emu, uint8_t d, uint8_t s)
{
cmp_byte(emu, d, s);
}
/*
* REMARKS:
* Implements the CMP instruction and side effects.
*/
static uint16_t
cmp_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return d;
}
static void
cmp_word_no_return(struct x86emu *emu, uint16_t d, uint16_t s)
{
cmp_word(emu, d, s);
}
/*
* REMARKS:
* Implements the CMP instruction and side effects.
*/
static uint32_t
cmp_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return d;
}
static void
cmp_long_no_return(struct x86emu *emu, uint32_t d, uint32_t s)
{
cmp_long(emu, d, s);
}
/*
* REMARKS:
* Implements the DAA instruction and side effects.
*/
static uint8_t
daa_byte(struct x86emu *emu, uint8_t d)
{
uint32_t res = d;
if ((d & 0xf) > 9 || ACCESS_FLAG(F_AF)) {
res += 6;
SET_FLAG(F_AF);
}
if (res > 0x9F || ACCESS_FLAG(F_CF)) {
res += 0x60;
SET_FLAG(F_CF);
}
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG((res & 0xFF) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the DAS instruction and side effects.
*/
static uint8_t
das_byte(struct x86emu *emu, uint8_t d)
{
if ((d & 0xf) > 9 || ACCESS_FLAG(F_AF)) {
d -= 6;
SET_FLAG(F_AF);
}
if (d > 0x9F || ACCESS_FLAG(F_CF)) {
d -= 0x60;
SET_FLAG(F_CF);
}
CONDITIONAL_SET_FLAG(d & 0x80, F_SF);
CONDITIONAL_SET_FLAG(d == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(d & 0xff), F_PF);
return d;
}
/*
* REMARKS:
* Implements the DEC instruction and side effects.
*/
static uint8_t
dec_byte(struct x86emu *emu, uint8_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - 1;
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
/* based on sub_byte, uses s==1. */
bc = (res & (~d | 1)) | (~d & 1);
/* carry flag unchanged */
CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the DEC instruction and side effects.
*/
static uint16_t
dec_word(struct x86emu *emu, uint16_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - 1;
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
/* based on the sub_byte routine, with s==1 */
bc = (res & (~d | 1)) | (~d & 1);
/* carry flag unchanged */
CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the DEC instruction and side effects.
*/
static uint32_t
dec_long(struct x86emu *emu, uint32_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - 1;
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | 1)) | (~d & 1);
/* carry flag unchanged */
CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the INC instruction and side effects.
*/
static uint8_t
inc_byte(struct x86emu *emu, uint8_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
res = d + 1;
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = ((1 & d) | (~res)) & (1 | d);
CONDITIONAL_SET_FLAG(XOR2(cc >> 6), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the INC instruction and side effects.
*/
static uint16_t
inc_word(struct x86emu *emu, uint16_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
res = d + 1;
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (1 & d) | ((~res) & (1 | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 14), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the INC instruction and side effects.
*/
static uint32_t
inc_long(struct x86emu *emu, uint32_t d)
{
uint32_t res; /* all operands in native machine order */
uint32_t cc;
res = d + 1;
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the carry chain SEE NOTE AT TOP. */
cc = (1 & d) | ((~res) & (1 | d));
CONDITIONAL_SET_FLAG(XOR2(cc >> 30), F_OF);
CONDITIONAL_SET_FLAG(cc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint8_t
or_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint8_t res; /* all operands in native machine order */
res = d | s;
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res), F_PF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint16_t
or_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint16_t res; /* all operands in native machine order */
res = d | s;
/* set the carry flag to be bit 8 */
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint32_t
or_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
res = d | s;
/* set the carry flag to be bit 8 */
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint8_t
neg_byte(struct x86emu *emu, uint8_t s)
{
uint8_t res;
uint8_t bc;
CONDITIONAL_SET_FLAG(s != 0, F_CF);
res = (uint8_t) - s;
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res), F_PF);
/* calculate the borrow chain --- modified such that d=0.
* substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for
* sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and
* res&0xfff... == res. Similarly ~d&s == s. So the simplified
* result is: */
bc = res | s;
CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint16_t
neg_word(struct x86emu *emu, uint16_t s)
{
uint16_t res;
uint16_t bc;
CONDITIONAL_SET_FLAG(s != 0, F_CF);
res = (uint16_t) - s;
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain --- modified such that d=0.
* substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for
* sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and
* res&0xfff... == res. Similarly ~d&s == s. So the simplified
* result is: */
bc = res | s;
CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the OR instruction and side effects.
*/
static uint32_t
neg_long(struct x86emu *emu, uint32_t s)
{
uint32_t res;
uint32_t bc;
CONDITIONAL_SET_FLAG(s != 0, F_CF);
res = (uint32_t) - s;
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain --- modified such that d=0.
* substitutiing d=0 into bc= res&(~d|s)|(~d&s); (the one used for
* sub) and simplifying, since ~d=0xff..., ~d|s == 0xffff..., and
* res&0xfff... == res. Similarly ~d&s == s. So the simplified
* result is: */
bc = res | s;
CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the RCL instruction and side effects.
*/
static uint8_t
rcl_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int res, cnt, mask, cf;
/* s is the rotate distance. It varies from 0 - 8. */
/* have
*
* CF B_7 B_6 B_5 B_4 B_3 B_2 B_1 B_0
*
* want to rotate through the carry by "s" bits. We could loop, but
* that's inefficient. So the width is 9, and we split into three
* parts:
*
* The new carry flag (was B_n) the stuff in B_n-1 .. B_0 the stuff
* in B_7 .. B_n+1
*
* The new rotate is done mod 9, and given this, for a rotation of n
* bits (mod 9) the new carry flag is then located n bits from the MSB.
* The low part is then shifted up cnt bits, and the high part is or'd
* in. Using CAPS for new values, and lowercase for the original
* values, this can be expressed as:
*
* IF n > 0 1) CF <- b_(8-n) 2) B_(7) .. B_(n) <- b_(8-(n+1)) .. b_0
* 3) B_(n-1) <- cf 4) B_(n-2) .. B_0 <- b_7 .. b_(8-(n-1))
*/
res = d;
if ((cnt = s % 9) != 0) {
/* extract the new CARRY FLAG. */
/* CF <- b_(8-n) */
cf = (d >> (8 - cnt)) & 0x1;
/*
* Get the low stuff which rotated into the range B_7 .. B_cnt
* B_(7) .. B_(n) <- b_(8-(n+1)) .. b_0
* note that the right hand side done by the mask.
*/
res = (d << cnt) & 0xff;
/*
* now the high stuff which rotated around into the positions
* B_cnt-2 .. B_0
* B_(n-2) .. B_0 <- b_7 .. b_(8-(n-1))
* shift it downward, 7-(n-2) = 9-n positions. and mask off
* the result before or'ing in.
*/
mask = (1 << (cnt - 1)) - 1;
res |= (d >> (9 - cnt)) & mask;
/* if the carry flag was set, or it in. */
if (ACCESS_FLAG(F_CF)) { /* carry flag is set */
/* B_(n-1) <- cf */
res |= 1 << (cnt - 1);
}
/* set the new carry flag, based on the variable "cf" */
CONDITIONAL_SET_FLAG(cf, F_CF);
/* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and
* the most significant bit. Blecck. */
/* parenthesized this expression since it appears to be
* causing OF to be misset */
CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 6) & 0x2)),
F_OF);
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the RCL instruction and side effects.
*/
static uint16_t
rcl_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int res, cnt, mask, cf;
res = d;
if ((cnt = s % 17) != 0) {
cf = (d >> (16 - cnt)) & 0x1;
res = (d << cnt) & 0xffff;
mask = (1 << (cnt - 1)) - 1;
res |= (d >> (17 - cnt)) & mask;
if (ACCESS_FLAG(F_CF)) {
res |= 1 << (cnt - 1);
}
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 14) & 0x2)),
F_OF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the RCL instruction and side effects.
*/
static uint32_t
rcl_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
uint32_t res, cnt, mask, cf;
res = d;
if ((cnt = s % 33) != 0) {
cf = (d >> (32 - cnt)) & 0x1;
res = (d << cnt) & 0xffffffff;
mask = (1 << (cnt - 1)) - 1;
res |= (d >> (33 - cnt)) & mask;
if (ACCESS_FLAG(F_CF)) { /* carry flag is set */
res |= 1 << (cnt - 1);
}
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG(cnt == 1 && XOR2(cf + ((res >> 30) & 0x2)),
F_OF);
}
return res;
}
/*
* REMARKS:
* Implements the RCR instruction and side effects.
*/
static uint8_t
rcr_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res, cnt;
uint32_t mask, cf, ocf = 0;
/* rotate right through carry */
/* s is the rotate distance. It varies from 0 - 8. d is the byte
* object rotated.
*
* have
*
* CF B_7 B_6 B_5 B_4 B_3 B_2 B_1 B_0
*
* The new rotate is done mod 9, and given this, for a rotation of n
* bits (mod 9) the new carry flag is then located n bits from the LSB.
* The low part is then shifted up cnt bits, and the high part is or'd
* in. Using CAPS for new values, and lowercase for the original
* values, this can be expressed as:
*
* IF n > 0
* 1) CF <- b_(n-1)
* 2) B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n)
* 3) B_(8-n) <- cf 4) B_(7) .. B_(8-(n-1)) <- b_(n-2) .. b_(0)
*/
res = d;
if ((cnt = s % 9) != 0) {
/* extract the new CARRY FLAG. */
/* CF <- b_(n-1) */
if (cnt == 1) {
cf = d & 0x1;
/* note hackery here. Access_flag(..) evaluates to
* either 0 if flag not set non-zero if flag is set.
* doing access_flag(..) != 0 casts that into either
* 0..1 in any representation of the flags register
* (i.e. packed bit array or unpacked.) */
ocf = ACCESS_FLAG(F_CF) != 0;
} else
cf = (d >> (cnt - 1)) & 0x1;
/* B_(8-(n+1)) .. B_(0) <- b_(7) .. b_n */
/* note that the right hand side done by the mask This is
* effectively done by shifting the object to the right. The
* result must be masked, in case the object came in and was
* treated as a negative number. Needed??? */
mask = (1 << (8 - cnt)) - 1;
res = (d >> cnt) & mask;
/* now the high stuff which rotated around into the positions
* B_cnt-2 .. B_0 */
/* B_(7) .. B_(8-(n-1)) <- b_(n-2) .. b_(0) */
/* shift it downward, 7-(n-2) = 9-n positions. and mask off
* the result before or'ing in. */
res |= (d << (9 - cnt));
/* if the carry flag was set, or it in. */
if (ACCESS_FLAG(F_CF)) { /* carry flag is set */
/* B_(8-n) <- cf */
res |= 1 << (8 - cnt);
}
/* set the new carry flag, based on the variable "cf" */
CONDITIONAL_SET_FLAG(cf, F_CF);
/* OVERFLOW is set *IFF* cnt==1, then it is the xor of CF and
* the most significant bit. Blecck. */
/* parenthesized... */
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 6) & 0x2)),
F_OF);
}
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the RCR instruction and side effects.
*/
static uint16_t
rcr_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
uint32_t res, cnt;
uint32_t mask, cf, ocf = 0;
/* rotate right through carry */
res = d;
if ((cnt = s % 17) != 0) {
if (cnt == 1) {
cf = d & 0x1;
ocf = ACCESS_FLAG(F_CF) != 0;
} else
cf = (d >> (cnt - 1)) & 0x1;
mask = (1 << (16 - cnt)) - 1;
res = (d >> cnt) & mask;
res |= (d << (17 - cnt));
if (ACCESS_FLAG(F_CF)) {
res |= 1 << (16 - cnt);
}
CONDITIONAL_SET_FLAG(cf, F_CF);
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 14) & 0x2)),
F_OF);
}
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the RCR instruction and side effects.
*/
static uint32_t
rcr_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
uint32_t res, cnt;
uint32_t mask, cf, ocf = 0;
/* rotate right through carry */
res = d;
if ((cnt = s % 33) != 0) {
if (cnt == 1) {
cf = d & 0x1;
ocf = ACCESS_FLAG(F_CF) != 0;
} else
cf = (d >> (cnt - 1)) & 0x1;
mask = (1 << (32 - cnt)) - 1;
res = (d >> cnt) & mask;
if (cnt != 1)
res |= (d << (33 - cnt));
if (ACCESS_FLAG(F_CF)) { /* carry flag is set */
res |= 1 << (32 - cnt);
}
CONDITIONAL_SET_FLAG(cf, F_CF);
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(ocf + ((d >> 30) & 0x2)),
F_OF);
}
}
return res;
}
/*
* REMARKS:
* Implements the ROL instruction and side effects.
*/
static uint8_t
rol_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int res, cnt, mask;
/* rotate left */
/* s is the rotate distance. It varies from 0 - 8. d is the byte
* object rotated.
*
* have
*
* CF B_7 ... B_0
*
* The new rotate is done mod 8. Much simpler than the "rcl" or "rcr"
* operations.
*
* IF n > 0 1) B_(7) .. B_(n) <- b_(8-(n+1)) .. b_(0) 2) B_(n-1) ..
* B_(0) <- b_(7) .. b_(8-n) */
res = d;
if ((cnt = s % 8) != 0) {
/* B_(7) .. B_(n) <- b_(8-(n+1)) .. b_(0) */
res = (d << cnt);
/* B_(n-1) .. B_(0) <- b_(7) .. b_(8-n) */
mask = (1 << cnt) - 1;
res |= (d >> (8 - cnt)) & mask;
/* OVERFLOW is set *IFF* s==1, then it is the xor of CF and
* the most significant bit. Blecck. */
CONDITIONAL_SET_FLAG(s == 1 &&
XOR2((res & 0x1) + ((res >> 6) & 0x2)),
F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the low order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x1, F_CF);
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the ROL instruction and side effects.
*/
static uint16_t
rol_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int res, cnt, mask;
res = d;
if ((cnt = s % 16) != 0) {
res = (d << cnt);
mask = (1 << cnt) - 1;
res |= (d >> (16 - cnt)) & mask;
CONDITIONAL_SET_FLAG(s == 1 &&
XOR2((res & 0x1) + ((res >> 14) & 0x2)),
F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the low order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x1, F_CF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the ROL instruction and side effects.
*/
static uint32_t
rol_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
uint32_t res, cnt, mask;
res = d;
if ((cnt = s % 32) != 0) {
res = (d << cnt);
mask = (1 << cnt) - 1;
res |= (d >> (32 - cnt)) & mask;
CONDITIONAL_SET_FLAG(s == 1 &&
XOR2((res & 0x1) + ((res >> 30) & 0x2)),
F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the low order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x1, F_CF);
}
return res;
}
/*
* REMARKS:
* Implements the ROR instruction and side effects.
*/
static uint8_t
ror_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int res, cnt, mask;
/* rotate right */
/* s is the rotate distance. It varies from 0 - 8. d is the byte
* object rotated.
*
* have
*
* B_7 ... B_0
*
* The rotate is done mod 8.
*
* IF n > 0 1) B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n) 2) B_(7) ..
* B_(8-n) <- b_(n-1) .. b_(0) */
res = d;
if ((cnt = s % 8) != 0) { /* not a typo, do nada if cnt==0 */
/* B_(7) .. B_(8-n) <- b_(n-1) .. b_(0) */
res = (d << (8 - cnt));
/* B_(8-(n+1)) .. B_(0) <- b_(7) .. b_(n) */
mask = (1 << (8 - cnt)) - 1;
res |= (d >> (cnt)) & mask;
/* OVERFLOW is set *IFF* s==1, then it is the xor of the two
* most significant bits. Blecck. */
CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 6), F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the high order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x80, F_CF);
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the ROR instruction and side effects.
*/
static uint16_t
ror_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int res, cnt, mask;
res = d;
if ((cnt = s % 16) != 0) {
res = (d << (16 - cnt));
mask = (1 << (16 - cnt)) - 1;
res |= (d >> (cnt)) & mask;
CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 14), F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the high order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x8000, F_CF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the ROR instruction and side effects.
*/
static uint32_t
ror_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
uint32_t res, cnt, mask;
res = d;
if ((cnt = s % 32) != 0) {
res = (d << (32 - cnt));
mask = (1 << (32 - cnt)) - 1;
res |= (d >> (cnt)) & mask;
CONDITIONAL_SET_FLAG(s == 1 && XOR2(res >> 30), F_OF);
}
if (s != 0) {
/* set the new carry flag, Note that it is the high order bit
* of the result!!! */
CONDITIONAL_SET_FLAG(res & 0x80000000, F_CF);
}
return res;
}
/*
* REMARKS:
* Implements the SHL instruction and side effects.
*/
static uint8_t
shl_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 8) {
cnt = s % 8;
/* last bit shifted out goes into carry flag */
if (cnt > 0) {
res = d << cnt;
cf = d & (1 << (8 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = (uint8_t) d;
}
if (cnt == 1) {
/* Needs simplification. */
CONDITIONAL_SET_FLAG(
(((res & 0x80) == 0x80) ^
(ACCESS_FLAG(F_CF) != 0)),
/* was (emu->x86.R_FLG&F_CF)==F_CF)), */
F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the SHL instruction and side effects.
*/
static uint16_t
shl_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 16) {
cnt = s % 16;
if (cnt > 0) {
res = d << cnt;
cf = d & (1 << (16 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = (uint16_t) d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(
(((res & 0x8000) == 0x8000) ^
(ACCESS_FLAG(F_CF) != 0)),
F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x8000, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SHL instruction and side effects.
*/
static uint32_t
shl_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 32) {
cnt = s % 32;
if (cnt > 0) {
res = d << cnt;
cf = d & (1 << (32 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG((((res & 0x80000000) == 0x80000000)
^ (ACCESS_FLAG(F_CF) != 0)), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80000000, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return res;
}
/*
* REMARKS:
* Implements the SHR instruction and side effects.
*/
static uint8_t
shr_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 8) {
cnt = s % 8;
if (cnt > 0) {
cf = d & (1 << (cnt - 1));
res = d >> cnt;
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = (uint8_t) d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(res >> 6), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d >> (s - 1)) & 0x1, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the SHR instruction and side effects.
*/
static uint16_t
shr_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 16) {
cnt = s % 16;
if (cnt > 0) {
cf = d & (1 << (cnt - 1));
res = d >> cnt;
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(res >> 14), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SHR instruction and side effects.
*/
static uint32_t
shr_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 32) {
cnt = s % 32;
if (cnt > 0) {
cf = d & (1 << (cnt - 1));
res = d >> cnt;
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(res >> 30), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
return res;
}
/*
* REMARKS:
* Implements the SAR instruction and side effects.
*/
static uint8_t
sar_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
unsigned int cnt, res, cf, mask, sf;
res = d;
sf = d & 0x80;
cnt = s % 8;
if (cnt > 0 && cnt < 8) {
mask = (1 << (8 - cnt)) - 1;
cf = d & (1 << (cnt - 1));
res = (d >> cnt) & mask;
CONDITIONAL_SET_FLAG(cf, F_CF);
if (sf) {
res |= ~mask;
}
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
} else if (cnt >= 8) {
if (sf) {
res = 0xff;
SET_FLAG(F_CF);
CLEAR_FLAG(F_ZF);
SET_FLAG(F_SF);
SET_FLAG(F_PF);
} else {
res = 0;
CLEAR_FLAG(F_CF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
}
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the SAR instruction and side effects.
*/
static uint16_t
sar_word(struct x86emu *emu, uint16_t d, uint8_t s)
{
unsigned int cnt, res, cf, mask, sf;
sf = d & 0x8000;
cnt = s % 16;
res = d;
if (cnt > 0 && cnt < 16) {
mask = (1 << (16 - cnt)) - 1;
cf = d & (1 << (cnt - 1));
res = (d >> cnt) & mask;
CONDITIONAL_SET_FLAG(cf, F_CF);
if (sf) {
res |= ~mask;
}
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else if (cnt >= 16) {
if (sf) {
res = 0xffff;
SET_FLAG(F_CF);
CLEAR_FLAG(F_ZF);
SET_FLAG(F_SF);
SET_FLAG(F_PF);
} else {
res = 0;
CLEAR_FLAG(F_CF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SAR instruction and side effects.
*/
static uint32_t
sar_long(struct x86emu *emu, uint32_t d, uint8_t s)
{
uint32_t cnt, res, cf, mask, sf;
sf = d & 0x80000000;
cnt = s % 32;
res = d;
if (cnt > 0 && cnt < 32) {
mask = (1 << (32 - cnt)) - 1;
cf = d & (1 << (cnt - 1));
res = (d >> cnt) & mask;
CONDITIONAL_SET_FLAG(cf, F_CF);
if (sf) {
res |= ~mask;
}
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else if (cnt >= 32) {
if (sf) {
res = 0xffffffff;
SET_FLAG(F_CF);
CLEAR_FLAG(F_ZF);
SET_FLAG(F_SF);
SET_FLAG(F_PF);
} else {
res = 0;
CLEAR_FLAG(F_CF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
}
return res;
}
/*
* REMARKS:
* Implements the SHLD instruction and side effects.
*/
static uint16_t
shld_word(struct x86emu *emu, uint16_t d, uint16_t fill, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 16) {
cnt = s % 16;
if (cnt > 0) {
res = (d << cnt) | (fill >> (16 - cnt));
cf = d & (1 << (16 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG((((res & 0x8000) == 0x8000) ^
(ACCESS_FLAG(F_CF) != 0)), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x8000, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SHLD instruction and side effects.
*/
static uint32_t
shld_long(struct x86emu *emu, uint32_t d, uint32_t fill, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 32) {
cnt = s % 32;
if (cnt > 0) {
res = (d << cnt) | (fill >> (32 - cnt));
cf = d & (1 << (32 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG((((res & 0x80000000) == 0x80000000)
^ (ACCESS_FLAG(F_CF) != 0)), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CONDITIONAL_SET_FLAG((d << (s - 1)) & 0x80000000, F_CF);
CLEAR_FLAG(F_OF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_PF);
SET_FLAG(F_ZF);
}
return res;
}
/*
* REMARKS:
* Implements the SHRD instruction and side effects.
*/
static uint16_t
shrd_word(struct x86emu *emu, uint16_t d, uint16_t fill, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 16) {
cnt = s % 16;
if (cnt > 0) {
cf = d & (1 << (cnt - 1));
res = (d >> cnt) | (fill << (16 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(res >> 14), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SHRD instruction and side effects.
*/
static uint32_t
shrd_long(struct x86emu *emu, uint32_t d, uint32_t fill, uint8_t s)
{
unsigned int cnt, res, cf;
if (s < 32) {
cnt = s % 32;
if (cnt > 0) {
cf = d & (1 << (cnt - 1));
res = (d >> cnt) | (fill << (32 - cnt));
CONDITIONAL_SET_FLAG(cf, F_CF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
} else {
res = d;
}
if (cnt == 1) {
CONDITIONAL_SET_FLAG(XOR2(res >> 30), F_OF);
} else {
CLEAR_FLAG(F_OF);
}
} else {
res = 0;
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
SET_FLAG(F_ZF);
CLEAR_FLAG(F_SF);
CLEAR_FLAG(F_PF);
}
return res;
}
/*
* REMARKS:
* Implements the SBB instruction and side effects.
*/
static uint8_t
sbb_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
if (ACCESS_FLAG(F_CF))
res = d - s - 1;
else
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the SBB instruction and side effects.
*/
static uint16_t
sbb_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
if (ACCESS_FLAG(F_CF))
res = d - s - 1;
else
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SBB instruction and side effects.
*/
static uint32_t
sbb_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
if (ACCESS_FLAG(F_CF))
res = d - s - 1;
else
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the SUB instruction and side effects.
*/
static uint8_t
sub_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG((res & 0xff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 6), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint8_t) res;
}
/*
* REMARKS:
* Implements the SUB instruction and side effects.
*/
static uint16_t
sub_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x8000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 14), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return (uint16_t) res;
}
/*
* REMARKS:
* Implements the SUB instruction and side effects.
*/
static uint32_t
sub_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
uint32_t bc;
res = d - s;
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG((res & 0xffffffff) == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* calculate the borrow chain. See note at top */
bc = (res & (~d | s)) | (~d & s);
CONDITIONAL_SET_FLAG(bc & 0x80000000, F_CF);
CONDITIONAL_SET_FLAG(XOR2(bc >> 30), F_OF);
CONDITIONAL_SET_FLAG(bc & 0x8, F_AF);
return res;
}
/*
* REMARKS:
* Implements the TEST instruction and side effects.
*/
static void
test_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint32_t res; /* all operands in native machine order */
res = d & s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* AF == dont care */
CLEAR_FLAG(F_CF);
}
/*
* REMARKS:
* Implements the TEST instruction and side effects.
*/
static void
test_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint32_t res; /* all operands in native machine order */
res = d & s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* AF == dont care */
CLEAR_FLAG(F_CF);
}
/*
* REMARKS:
* Implements the TEST instruction and side effects.
*/
static void
test_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
res = d & s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
/* AF == dont care */
CLEAR_FLAG(F_CF);
}
/*
* REMARKS:
* Implements the XOR instruction and side effects.
*/
static uint8_t
xor_byte(struct x86emu *emu, uint8_t d, uint8_t s)
{
uint8_t res; /* all operands in native machine order */
res = d ^ s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x80, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res), F_PF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
return res;
}
/*
* REMARKS:
* Implements the XOR instruction and side effects.
*/
static uint16_t
xor_word(struct x86emu *emu, uint16_t d, uint16_t s)
{
uint16_t res; /* all operands in native machine order */
res = d ^ s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x8000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
return res;
}
/*
* REMARKS:
* Implements the XOR instruction and side effects.
*/
static uint32_t
xor_long(struct x86emu *emu, uint32_t d, uint32_t s)
{
uint32_t res; /* all operands in native machine order */
res = d ^ s;
CLEAR_FLAG(F_OF);
CONDITIONAL_SET_FLAG(res & 0x80000000, F_SF);
CONDITIONAL_SET_FLAG(res == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(res & 0xff), F_PF);
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
return res;
}
/*
* REMARKS:
* Implements the IMUL instruction and side effects.
*/
static void
imul_byte(struct x86emu *emu, uint8_t s)
{
int16_t res = (int16_t) ((int8_t) emu->x86.R_AL * (int8_t) s);
emu->x86.R_AX = res;
if (((emu->x86.R_AL & 0x80) == 0 && emu->x86.R_AH == 0x00) ||
((emu->x86.R_AL & 0x80) != 0 && emu->x86.R_AH == 0xFF)) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the IMUL instruction and side effects.
*/
static void
imul_word(struct x86emu *emu, uint16_t s)
{
int32_t res = (int16_t) emu->x86.R_AX * (int16_t) s;
emu->x86.R_AX = (uint16_t) res;
emu->x86.R_DX = (uint16_t) (res >> 16);
if (((emu->x86.R_AX & 0x8000) == 0 && emu->x86.R_DX == 0x00) ||
((emu->x86.R_AX & 0x8000) != 0 && emu->x86.R_DX == 0xFF)) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the IMUL instruction and side effects.
*/
static void
imul_long(struct x86emu *emu, uint32_t s)
{
int64_t res;
res = (int64_t)(int32_t)emu->x86.R_EAX * (int32_t)s;
emu->x86.R_EAX = (uint32_t)res;
emu->x86.R_EDX = ((uint64_t)res) >> 32;
if (((emu->x86.R_EAX & 0x80000000) == 0 && emu->x86.R_EDX == 0x00) ||
((emu->x86.R_EAX & 0x80000000) != 0 && emu->x86.R_EDX == 0xFF)) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the MUL instruction and side effects.
*/
static void
mul_byte(struct x86emu *emu, uint8_t s)
{
uint16_t res = (uint16_t) (emu->x86.R_AL * s);
emu->x86.R_AX = res;
if (emu->x86.R_AH == 0) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the MUL instruction and side effects.
*/
static void
mul_word(struct x86emu *emu, uint16_t s)
{
uint32_t res = emu->x86.R_AX * s;
emu->x86.R_AX = (uint16_t) res;
emu->x86.R_DX = (uint16_t) (res >> 16);
if (emu->x86.R_DX == 0) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the MUL instruction and side effects.
*/
static void
mul_long(struct x86emu *emu, uint32_t s)
{
uint64_t res = (uint64_t) emu->x86.R_EAX * s;
emu->x86.R_EAX = (uint32_t) res;
emu->x86.R_EDX = (uint32_t) (res >> 32);
if (emu->x86.R_EDX == 0) {
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_OF);
} else {
SET_FLAG(F_CF);
SET_FLAG(F_OF);
}
}
/*
* REMARKS:
* Implements the IDIV instruction and side effects.
*/
static void
idiv_byte(struct x86emu *emu, uint8_t s)
{
int32_t dvd, div, mod;
dvd = (int16_t) emu->x86.R_AX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (int8_t) s;
mod = dvd % (int8_t) s;
if (div > 0x7f || div < -0x7f) {
x86emu_intr_raise(emu, 8);
return;
}
emu->x86.R_AL = (int8_t) div;
emu->x86.R_AH = (int8_t) mod;
}
/*
* REMARKS:
* Implements the IDIV instruction and side effects.
*/
static void
idiv_word(struct x86emu *emu, uint16_t s)
{
int32_t dvd, div, mod;
dvd = (((int32_t) emu->x86.R_DX) << 16) | emu->x86.R_AX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (int16_t) s;
mod = dvd % (int16_t) s;
if (div > 0x7fff || div < -0x7fff) {
x86emu_intr_raise(emu, 8);
return;
}
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_SF);
CONDITIONAL_SET_FLAG(div == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF);
emu->x86.R_AX = (uint16_t) div;
emu->x86.R_DX = (uint16_t) mod;
}
/*
* REMARKS:
* Implements the IDIV instruction and side effects.
*/
static void
idiv_long(struct x86emu *emu, uint32_t s)
{
int64_t dvd, div, mod;
dvd = (((int64_t) emu->x86.R_EDX) << 32) | emu->x86.R_EAX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (int32_t) s;
mod = dvd % (int32_t) s;
if (div > 0x7fffffff || div < -0x7fffffff) {
x86emu_intr_raise(emu, 8);
return;
}
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_ZF);
CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF);
emu->x86.R_EAX = (uint32_t) div;
emu->x86.R_EDX = (uint32_t) mod;
}
/*
* REMARKS:
* Implements the DIV instruction and side effects.
*/
static void
div_byte(struct x86emu *emu, uint8_t s)
{
uint32_t dvd, div, mod;
dvd = emu->x86.R_AX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (uint8_t) s;
mod = dvd % (uint8_t) s;
if (div > 0xff) {
x86emu_intr_raise(emu, 8);
return;
}
emu->x86.R_AL = (uint8_t) div;
emu->x86.R_AH = (uint8_t) mod;
}
/*
* REMARKS:
* Implements the DIV instruction and side effects.
*/
static void
div_word(struct x86emu *emu, uint16_t s)
{
uint32_t dvd, div, mod;
dvd = (((uint32_t) emu->x86.R_DX) << 16) | emu->x86.R_AX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (uint16_t) s;
mod = dvd % (uint16_t) s;
if (div > 0xffff) {
x86emu_intr_raise(emu, 8);
return;
}
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_SF);
CONDITIONAL_SET_FLAG(div == 0, F_ZF);
CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF);
emu->x86.R_AX = (uint16_t) div;
emu->x86.R_DX = (uint16_t) mod;
}
/*
* REMARKS:
* Implements the DIV instruction and side effects.
*/
static void
div_long(struct x86emu *emu, uint32_t s)
{
uint64_t dvd, div, mod;
dvd = (((uint64_t) emu->x86.R_EDX) << 32) | emu->x86.R_EAX;
if (s == 0) {
x86emu_intr_raise(emu, 8);
return;
}
div = dvd / (uint32_t) s;
mod = dvd % (uint32_t) s;
if (div > 0xffffffff) {
x86emu_intr_raise(emu, 8);
return;
}
CLEAR_FLAG(F_CF);
CLEAR_FLAG(F_AF);
CLEAR_FLAG(F_SF);
SET_FLAG(F_ZF);
CONDITIONAL_SET_FLAG(PARITY(mod & 0xff), F_PF);
emu->x86.R_EAX = (uint32_t) div;
emu->x86.R_EDX = (uint32_t) mod;
}
/*
* REMARKS:
* Implements the IN string instruction and side effects.
*/
static void
ins(struct x86emu *emu, int size)
{
int inc = size;
if (ACCESS_FLAG(F_DF)) {
inc = -size;
}
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* in until CX is ZERO. */
uint32_t count = ((emu->x86.mode & SYSMODE_PREFIX_DATA) ?
emu->x86.R_ECX : emu->x86.R_CX);
switch (size) {
case 1:
while (count--) {
store_byte(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inb) (emu, emu->x86.R_DX));
emu->x86.R_DI += inc;
}
break;
case 2:
while (count--) {
store_word(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inw) (emu, emu->x86.R_DX));
emu->x86.R_DI += inc;
}
break;
case 4:
while (count--) {
store_long(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inl) (emu, emu->x86.R_DX));
emu->x86.R_DI += inc;
break;
}
}
emu->x86.R_CX = 0;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_ECX = 0;
}
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
} else {
switch (size) {
case 1:
store_byte(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inb) (emu, emu->x86.R_DX));
break;
case 2:
store_word(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inw) (emu, emu->x86.R_DX));
break;
case 4:
store_long(emu, emu->x86.R_ES, emu->x86.R_DI,
(*emu->emu_inl) (emu, emu->x86.R_DX));
break;
}
emu->x86.R_DI += inc;
}
}
/*
* REMARKS:
* Implements the OUT string instruction and side effects.
*/
static void
outs(struct x86emu *emu, int size)
{
int inc = size;
if (ACCESS_FLAG(F_DF)) {
inc = -size;
}
if (emu->x86.mode & (SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE)) {
/* dont care whether REPE or REPNE */
/* out until CX is ZERO. */
uint32_t count = ((emu->x86.mode & SYSMODE_PREFIX_DATA) ?
emu->x86.R_ECX : emu->x86.R_CX);
switch (size) {
case 1:
while (count--) {
(*emu->emu_outb) (emu, emu->x86.R_DX,
fetch_byte(emu, emu->x86.R_ES,
emu->x86.R_SI));
emu->x86.R_SI += inc;
}
break;
case 2:
while (count--) {
(*emu->emu_outw) (emu, emu->x86.R_DX,
fetch_word(emu, emu->x86.R_ES,
emu->x86.R_SI));
emu->x86.R_SI += inc;
}
break;
case 4:
while (count--) {
(*emu->emu_outl) (emu, emu->x86.R_DX,
fetch_long(emu, emu->x86.R_ES,
emu->x86.R_SI));
emu->x86.R_SI += inc;
break;
}
}
emu->x86.R_CX = 0;
if (emu->x86.mode & SYSMODE_PREFIX_DATA) {
emu->x86.R_ECX = 0;
}
emu->x86.mode &= ~(SYSMODE_PREFIX_REPE | SYSMODE_PREFIX_REPNE);
} else {
switch (size) {
case 1:
(*emu->emu_outb) (emu, emu->x86.R_DX,
fetch_byte(emu, emu->x86.R_ES, emu->x86.R_SI));
break;
case 2:
(*emu->emu_outw) (emu, emu->x86.R_DX,
fetch_word(emu, emu->x86.R_ES, emu->x86.R_SI));
break;
case 4:
(*emu->emu_outl) (emu, emu->x86.R_DX,
fetch_long(emu, emu->x86.R_ES, emu->x86.R_SI));
break;
}
emu->x86.R_SI += inc;
}
}
/*
* REMARKS:
* Pushes a word onto the stack.
*
* NOTE: Do not inline this, as (*emu->emu_wrX) is already inline!
*/
static void
push_word(struct x86emu *emu, uint16_t w)
{
emu->x86.R_SP -= 2;
store_word(emu, emu->x86.R_SS, emu->x86.R_SP, w);
}
/*
* REMARKS:
* Pushes a long onto the stack.
*
* NOTE: Do not inline this, as (*emu->emu_wrX) is already inline!
*/
static void
push_long(struct x86emu *emu, uint32_t w)
{
emu->x86.R_SP -= 4;
store_long(emu, emu->x86.R_SS, emu->x86.R_SP, w);
}
/*
* REMARKS:
* Pops a word from the stack.
*
* NOTE: Do not inline this, as (*emu->emu_rdX) is already inline!
*/
static uint16_t
pop_word(struct x86emu *emu)
{
uint16_t res;
res = fetch_word(emu, emu->x86.R_SS, emu->x86.R_SP);
emu->x86.R_SP += 2;
return res;
}
/*
* REMARKS:
* Pops a long from the stack.
*
* NOTE: Do not inline this, as (*emu->emu_rdX) is already inline!
*/
static uint32_t
pop_long(struct x86emu *emu)
{
uint32_t res;
res = fetch_long(emu, emu->x86.R_SS, emu->x86.R_SP);
emu->x86.R_SP += 4;
return res;
}
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