187 lines
5.3 KiB
C
187 lines
5.3 KiB
C
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/* $NetBSD: x86emu.h,v 1.1 2007/12/01 20:14:10 joerg Exp $ */
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/* $OpenBSD: x86emu.h,v 1.3 2009/06/06 03:45:05 matthieu Exp $ */
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/****************************************************************************
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*
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* Realmode X86 Emulator Library
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*
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* Copyright (C) 1996-1999 SciTech Software, Inc.
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* Copyright (C) David Mosberger-Tang
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* Copyright (C) 1999 Egbert Eich
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* Copyright (C) 2007 Joerg Sonnenberger
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*
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* ========================================================================
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of the authors not be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The authors makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*
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* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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****************************************************************************/
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#ifndef __X86EMU_X86EMU_H
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#define __X86EMU_X86EMU_H
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#include <sys/types.h>
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#include <sys/endian.h>
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#ifdef _KERNEL
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#include <sys/systm.h>
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#else
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#include <setjmp.h>
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#endif
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/*
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* General EAX, EBX, ECX, EDX type registers. Note that for
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* portability, and speed, the issue of byte swapping is not addressed
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* in the registers. All registers are stored in the default format
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* available on the host machine. The only critical issue is that the
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* registers should line up EXACTLY in the same manner as they do in
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* the 386. That is:
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*
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* EAX & 0xff === AL
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* EAX & 0xffff == AX
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*
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* etc. The result is that alot of the calculations can then be
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* done using the native instruction set fully.
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*/
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#ifdef __BIG_ENDIAN__
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struct x86emu_register32 {
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uint32_t e_reg;
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};
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struct x86emu_register16 {
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uint16_t filler0;
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uint16_t x_reg;
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};
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struct x86emu_register8 {
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uint8_t filler0, filler1;
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uint8_t h_reg, l_reg;
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};
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#else /* !__BIG_ENDIAN__ */
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struct x86emu_register32 {
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uint32_t e_reg;
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};
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struct x86emu_register16 {
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uint16_t x_reg;
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};
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struct x86emu_register8 {
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uint8_t l_reg, h_reg;
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};
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#endif /* BIG_ENDIAN */
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union x86emu_register {
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struct x86emu_register32 I32_reg;
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struct x86emu_register16 I16_reg;
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struct x86emu_register8 I8_reg;
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};
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struct x86emu_regs {
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uint16_t register_cs;
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uint16_t register_ds;
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uint16_t register_es;
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uint16_t register_fs;
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uint16_t register_gs;
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uint16_t register_ss;
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uint32_t register_flags;
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union x86emu_register register_a;
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union x86emu_register register_b;
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union x86emu_register register_c;
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union x86emu_register register_d;
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union x86emu_register register_sp;
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union x86emu_register register_bp;
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union x86emu_register register_si;
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union x86emu_register register_di;
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union x86emu_register register_ip;
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/*
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* MODE contains information on:
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* REPE prefix 2 bits repe,repne
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* SEGMENT overrides 5 bits normal,DS,SS,CS,ES
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* Delayed flag set 3 bits (zero, signed, parity)
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* reserved 6 bits
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* interrupt # 8 bits instruction raised interrupt
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* BIOS video segregs 4 bits
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* Interrupt Pending 1 bits
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* Extern interrupt 1 bits
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* Halted 1 bits
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*/
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uint32_t mode;
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volatile int intr; /* mask of pending interrupts */
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uint8_t intno;
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uint8_t __pad[3];
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};
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struct x86emu {
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char *mem_base;
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size_t mem_size;
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void *sys_private;
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struct x86emu_regs x86;
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#ifdef _KERNEL
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label_t exec_state;
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#else
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jmp_buf exec_state;
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#endif
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uint64_t cur_cycles;
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unsigned int cur_mod:2;
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unsigned int cur_rl:3;
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unsigned int cur_rh:3;
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uint32_t cur_offset;
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uint8_t (*emu_rdb)(struct x86emu *, uint32_t addr);
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uint16_t (*emu_rdw)(struct x86emu *, uint32_t addr);
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uint32_t (*emu_rdl)(struct x86emu *, uint32_t addr);
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void (*emu_wrb)(struct x86emu *, uint32_t addr,uint8_t val);
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void (*emu_wrw)(struct x86emu *, uint32_t addr, uint16_t val);
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void (*emu_wrl)(struct x86emu *, uint32_t addr, uint32_t val);
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uint8_t (*emu_inb)(struct x86emu *, uint16_t addr);
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uint16_t (*emu_inw)(struct x86emu *, uint16_t addr);
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uint32_t (*emu_inl)(struct x86emu *, uint16_t addr);
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void (*emu_outb)(struct x86emu *, uint16_t addr, uint8_t val);
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void (*emu_outw)(struct x86emu *, uint16_t addr, uint16_t val);
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void (*emu_outl)(struct x86emu *, uint16_t addr, uint32_t val);
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void (*_x86emu_intrTab[256])(struct x86emu *, int);
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};
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__BEGIN_DECLS
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void x86emu_init_default(struct x86emu *);
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/* decode.c */
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void x86emu_exec(struct x86emu *);
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void x86emu_exec_call(struct x86emu *, uint16_t, uint16_t);
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void x86emu_exec_intr(struct x86emu *, uint8_t);
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void x86emu_halt_sys(struct x86emu *) __dead;
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__END_DECLS
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#endif /* __X86EMU_X86EMU_H */
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