520 lines
16 KiB
C
520 lines
16 KiB
C
/*
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* fpu_entry.c
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*
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* The entry function for wm-FPU-emu
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*
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*
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* Copyright (C) 1992,1993,1994
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* W. Metzenthen, 22 Parker St, Ormond, Vic 3163,
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* Australia. E-mail billm@vaxc.cc.monash.edu.au
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* All rights reserved.
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*
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* This copyright notice covers the redistribution and use of the
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* FPU emulator developed by W. Metzenthen. It covers only its use
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* in the 386BSD, FreeBSD and NetBSD operating systems. Any other
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* use is not permitted under this copyright.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must include information specifying
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* that source code for the emulator is freely available and include
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* either:
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* a) an offer to provide the source code for a nominal distribution
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* fee, or
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* b) list at least two alternative methods whereby the source
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* can be obtained, e.g. a publically accessible bulletin board
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* and an anonymous ftp site from which the software can be
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* downloaded.
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* 3. All advertising materials specifically mentioning features or use of
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* this emulator must acknowledge that it was developed by W. Metzenthen.
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* 4. The name of W. Metzenthen may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* W. METZENTHEN BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* The purpose of this copyright, based upon the Berkeley copyright, is to
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* ensure that the covered software remains freely available to everyone.
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*
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* The software (with necessary differences) is also available, but under
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* the terms of the GNU copyleft, for the Linux operating system and for
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* the djgpp ms-dos extender.
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*
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* W. Metzenthen June 1994.
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*
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* $FreeBSD$
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*
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*/
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/*---------------------------------------------------------------------------+
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| Note: |
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| The file contains code which accesses user memory. |
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| Emulator static data may change when user memory is accessed, due to |
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| other processes using the emulator while swapping is in progress. |
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+---------------------------------------------------------------------------*/
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/*---------------------------------------------------------------------------+
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| math_emulate() is the sole entry point for wm-FPU-emu |
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+---------------------------------------------------------------------------*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/kernel.h>
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#include <machine/cpu.h>
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#include <machine/pcb.h>
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#include <gnu/i386/fpemul/fpu_emu.h>
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#include <gnu/i386/fpemul/fpu_system.h>
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#include <gnu/i386/fpemul/exception.h>
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#include <gnu/i386/fpemul/status_w.h>
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#define __BAD__ Un_impl /* Not implemented */
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#define FPU_LOOKAHEAD 1 /* For performance boost */
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#if FPU_LOOKAHEAD != 0 /* I think thet we have to limit the */
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#define LOOKAHEAD_LIMIT 7 /* Max number of lookahead instructions*/
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#endif /* Or else a prog consisting of a million */
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/* fnops will spend all its time in kernel*/
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#ifndef NO_UNDOC_CODE /* Un-documented FPU op-codes supported by
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* default. */
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/* WARNING: These codes are not documented by Intel in their 80486 manual
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and may not work on FPU clones or later Intel FPUs. */
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/* Changes to support the un-doc codes provided by Linus Torvalds. */
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#define _d9_d8_ fstp_i /* unofficial code (19) */
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#define _dc_d0_ fcom_st /* unofficial code (14) */
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#define _dc_d8_ fcompst /* unofficial code (1c) */
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#define _dd_c8_ fxch_i /* unofficial code (0d) */
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#define _de_d0_ fcompst /* unofficial code (16) */
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#define _df_c0_ ffreep /* unofficial code (07) ffree + pop */
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#define _df_c8_ fxch_i /* unofficial code (0f) */
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#define _df_d0_ fstp_i /* unofficial code (17) */
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#define _df_d8_ fstp_i /* unofficial code (1f) */
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static FUNC st_instr_table[64] = {
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fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, _df_c0_,
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fmul__, fxch_i, __BAD__, __BAD__, fmul_i, _dd_c8_, fmulp_, _df_c8_,
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fcom_st, fp_nop, __BAD__, __BAD__, _dc_d0_, fst_i_, _de_d0_, _df_d0_,
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fcompst, _d9_d8_, __BAD__, __BAD__, _dc_d8_, fstp_i, fcompp, _df_d8_,
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fsub__, fp_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_,
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fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__,
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fdiv__, trig_a, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__,
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fdivr_, trig_b, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__,
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};
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#else /* Support only documented FPU op-codes */
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static FUNC st_instr_table[64] = {
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fadd__, fld_i_, __BAD__, __BAD__, fadd_i, ffree_, faddp_, __BAD__,
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fmul__, fxch_i, __BAD__, __BAD__, fmul_i, __BAD__, fmulp_, __BAD__,
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fcom_st, fp_nop, __BAD__, __BAD__, __BAD__, fst_i_, __BAD__, __BAD__,
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fcompst, __BAD__, __BAD__, __BAD__, __BAD__, fstp_i, fcompp, __BAD__,
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fsub__, fp_etc, __BAD__, finit_, fsubri, fucom_, fsubrp, fstsw_,
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fsubr_, fconst, fucompp, __BAD__, fsub_i, fucomp, fsubp_, __BAD__,
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fdiv__, trig_a, __BAD__, __BAD__, fdivri, __BAD__, fdivrp, __BAD__,
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fdivr_, trig_b, __BAD__, __BAD__, fdiv_i, __BAD__, fdivp_, __BAD__,
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};
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#endif /* NO_UNDOC_CODE */
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#define _NONE_ 0 /* Take no special action */
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#define _REG0_ 1 /* Need to check for not empty st(0) */
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#define _REGI_ 2 /* Need to check for not empty st(0) and
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* st(rm) */
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#define _REGi_ 0 /* Uses st(rm) */
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#define _PUSH_ 3 /* Need to check for space to push onto stack */
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#define _null_ 4 /* Function illegal or not implemented */
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#define _REGIi 5 /* Uses st(0) and st(rm), result to st(rm) */
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#define _REGIp 6 /* Uses st(0) and st(rm), result to st(rm)
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* then pop */
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#define _REGIc 0 /* Compare st(0) and st(rm) */
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#define _REGIn 0 /* Uses st(0) and st(rm), but handle checks
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* later */
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#ifndef NO_UNDOC_CODE
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/* Un-documented FPU op-codes supported by default. (see above) */
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static unsigned char type_table[64] = {
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_REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _REGi_,
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_REGI_, _REGIn, _null_, _null_, _REGIi, _REGI_, _REGIp, _REGI_,
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_REGIc, _NONE_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
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_REGIc, _REG0_, _null_, _null_, _REGIc, _REG0_, _REGIc, _REG0_,
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_REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
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_REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
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_REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
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_REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
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};
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#else /* Support only documented FPU op-codes */
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static unsigned char type_table[64] = {
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_REGI_, _NONE_, _null_, _null_, _REGIi, _REGi_, _REGIp, _null_,
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_REGI_, _REGIn, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
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_REGIc, _NONE_, _null_, _null_, _null_, _REG0_, _null_, _null_,
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_REGIc, _null_, _null_, _null_, _null_, _REG0_, _REGIc, _null_,
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_REGI_, _NONE_, _null_, _NONE_, _REGIi, _REGIc, _REGIp, _NONE_,
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_REGI_, _NONE_, _REGIc, _null_, _REGIi, _REGIc, _REGIp, _null_,
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_REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_,
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_REGI_, _NONE_, _null_, _null_, _REGIi, _null_, _REGIp, _null_
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};
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#endif /* NO_UNDOC_CODE */
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/* Be careful when using any of these global variables...
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they might change if swapping is triggered */
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unsigned char FPU_rm;
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char FPU_st0_tag;
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FPU_REG *FPU_st0_ptr;
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#ifdef PARANOID
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char emulating = 0;
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#endif /* PARANOID */
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#define bswapw(x) __asm__("xchgb %%al,%%ah":"=a" (x):"0" ((short)x))
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#define math_abort(signo) \
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FPU_EIP = FPU_ORIG_EIP;REENTRANT_CHECK(OFF);return(signo);
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static int
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math_emulate(struct trapframe * tframe)
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{
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unsigned char FPU_modrm;
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unsigned short code;
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#ifdef LOOKAHEAD_LIMIT
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int lookahead_limit = LOOKAHEAD_LIMIT;
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#endif
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#ifdef PARANOID
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if (emulating) {
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printf("ERROR: wm-FPU-emu is not RE-ENTRANT!\n");
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}
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REENTRANT_CHECK(ON);
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#endif /* PARANOID */
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if ((((struct pcb *) curproc->p_addr)->pcb_flags & FP_SOFTFP) == 0) {
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finit();
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control_word = __INITIAL_NPXCW__;
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((struct pcb *) curproc->p_addr)->pcb_flags |= FP_SOFTFP;
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}
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FPU_info = tframe;
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FPU_ORIG_EIP = FPU_EIP; /* --pink-- */
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if (FPU_CS != 0x001f) {
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printf("math_emulate: %x : %x\n", FPU_CS, FPU_EIP);
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panic("FPU emulation in kernel");
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}
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#ifdef notyet
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/* We cannot handle emulation in v86-mode */
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if (FPU_EFLAGS & 0x00020000) {
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FPU_ORIG_EIP = FPU_EIP;
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math_abort(FPU_info, SIGILL);
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}
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#endif
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FPU_lookahead = FPU_LOOKAHEAD;
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if (curproc->p_flag & P_TRACED)
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FPU_lookahead = 0;
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do_another_FPU_instruction:
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REENTRANT_CHECK(OFF);
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code = fuword((u_int *) FPU_EIP);
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REENTRANT_CHECK(ON);
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if ((code & 0xff) == 0x9b) { /* fwait */
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if (status_word & SW_Summary)
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goto do_the_FPU_interrupt;
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else {
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FPU_EIP++;
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goto FPU_instruction_done;
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}
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}
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if (status_word & SW_Summary) {
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/* Ignore the error for now if the current instruction is a
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* no-wait control instruction */
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/* The 80486 manual contradicts itself on this topic, so I use
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* the following list of such instructions until I can check
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* on a real 80486: fninit, fnstenv, fnsave, fnstsw, fnstenv,
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* fnclex. */
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if (!((((code & 0xf803) == 0xe003) || /* fnclex, fninit,
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* fnstsw */
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(((code & 0x3003) == 0x3001) && /* fnsave, fnstcw,
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* fnstenv, fnstsw */
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((code & 0xc000) != 0xc000))))) {
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/* This is a guess about what a real FPU might do to
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* this bit: */
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/* status_word &= ~SW_Summary; ****/
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/* We need to simulate the action of the kernel to FPU
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* interrupts here. Currently, the "real FPU" part of
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* the kernel (0.99.10) clears the exception flags,
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* sets the registers to empty, and passes information
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* back to the interrupted process via the cs selector
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* and operand selector, so we do the same. */
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do_the_FPU_interrupt:
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cs_selector &= 0xffff0000;
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cs_selector |= (status_word & ~SW_Top) | ((top & 7) << SW_Top_Shift);
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operand_selector = tag_word();
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status_word = 0;
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top = 0;
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{
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int r;
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for (r = 0; r < 8; r++) {
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regs[r].tag = TW_Empty;
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}
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}
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REENTRANT_CHECK(OFF);
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math_abort(SIGFPE);
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}
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}
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FPU_entry_eip = FPU_ORIG_EIP = FPU_EIP;
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if ((code & 0xff) == 0x66) { /* size prefix */
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FPU_EIP++;
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REENTRANT_CHECK(OFF);
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code = fuword((u_int *) FPU_EIP);
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REENTRANT_CHECK(ON);
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}
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FPU_EIP += 2;
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FPU_modrm = code >> 8;
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FPU_rm = FPU_modrm & 7;
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if (FPU_modrm < 0300) {
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/* All of these instructions use the mod/rm byte to get a data
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* address */
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get_address(FPU_modrm);
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if (!(code & 1)) {
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unsigned short status1 = status_word;
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FPU_st0_ptr = &st(0);
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FPU_st0_tag = FPU_st0_ptr->tag;
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/* Stack underflow has priority */
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if (NOT_EMPTY_0) {
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switch ((code >> 1) & 3) {
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case 0:
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reg_load_single();
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break;
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case 1:
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reg_load_int32();
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break;
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case 2:
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reg_load_double();
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break;
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case 3:
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reg_load_int16();
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break;
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}
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/* No more access to user memory, it is safe
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* to use static data now */
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FPU_st0_ptr = &st(0);
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FPU_st0_tag = FPU_st0_ptr->tag;
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/* NaN operands have the next priority. */
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/* We have to delay looking at st(0) until
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* after loading the data, because that data
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* might contain an SNaN */
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if ((FPU_st0_tag == TW_NaN) ||
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(FPU_loaded_data.tag == TW_NaN)) {
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/* Restore the status word; we might
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* have loaded a denormal. */
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status_word = status1;
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if ((FPU_modrm & 0x30) == 0x10) {
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/* fcom or fcomp */
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EXCEPTION(EX_Invalid);
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setcc(SW_C3 | SW_C2 | SW_C0);
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if (FPU_modrm & 0x08)
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pop(); /* fcomp, so we pop. */
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} else
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real_2op_NaN(FPU_st0_ptr, &FPU_loaded_data, FPU_st0_ptr);
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goto reg_mem_instr_done;
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}
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switch ((FPU_modrm >> 3) & 7) {
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case 0: /* fadd */
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reg_add(FPU_st0_ptr, &FPU_loaded_data, FPU_st0_ptr, control_word);
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break;
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case 1: /* fmul */
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reg_mul(FPU_st0_ptr, &FPU_loaded_data, FPU_st0_ptr, control_word);
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break;
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case 2: /* fcom */
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compare_st_data();
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break;
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case 3: /* fcomp */
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compare_st_data();
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pop();
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break;
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case 4: /* fsub */
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reg_sub(FPU_st0_ptr, &FPU_loaded_data, FPU_st0_ptr, control_word);
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break;
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case 5: /* fsubr */
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reg_sub(&FPU_loaded_data, FPU_st0_ptr, FPU_st0_ptr, control_word);
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break;
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case 6: /* fdiv */
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reg_div(FPU_st0_ptr, &FPU_loaded_data, FPU_st0_ptr, control_word);
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break;
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case 7: /* fdivr */
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if (FPU_st0_tag == TW_Zero)
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status_word = status1; /* Undo any denorm tag,
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* zero-divide has
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* priority. */
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reg_div(&FPU_loaded_data, FPU_st0_ptr, FPU_st0_ptr, control_word);
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break;
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}
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} else {
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if ((FPU_modrm & 0x30) == 0x10) {
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/* The instruction is fcom or fcomp */
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EXCEPTION(EX_StackUnder);
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setcc(SW_C3 | SW_C2 | SW_C0);
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if (FPU_modrm & 0x08)
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pop(); /* fcomp, Empty or not,
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* we pop. */
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} else
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stack_underflow();
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}
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} else {
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load_store_instr(((FPU_modrm & 0x38) | (code & 6)) >> 1);
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}
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reg_mem_instr_done:
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data_operand_offset = (intptr_t) (void *) FPU_data_address;
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} else {
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/* None of these instructions access user memory */
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unsigned char instr_index = (FPU_modrm & 0x38) | (code & 7);
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FPU_st0_ptr = &st(0);
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FPU_st0_tag = FPU_st0_ptr->tag;
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switch (type_table[(int) instr_index]) {
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case _NONE_: /* also _REGIc: _REGIn */
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break;
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case _REG0_:
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if (!NOT_EMPTY_0) {
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stack_underflow();
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goto FPU_instruction_done;
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}
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break;
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case _REGIi:
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if (!NOT_EMPTY_0 || !NOT_EMPTY(FPU_rm)) {
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stack_underflow_i(FPU_rm);
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goto FPU_instruction_done;
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}
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break;
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case _REGIp:
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if (!NOT_EMPTY_0 || !NOT_EMPTY(FPU_rm)) {
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stack_underflow_i(FPU_rm);
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pop();
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goto FPU_instruction_done;
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}
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break;
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case _REGI_:
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if (!NOT_EMPTY_0 || !NOT_EMPTY(FPU_rm)) {
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stack_underflow();
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goto FPU_instruction_done;
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}
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break;
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case _PUSH_: /* Only used by the fld st(i) instruction */
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break;
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case _null_:
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Un_impl();
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goto FPU_instruction_done;
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default:
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EXCEPTION(EX_INTERNAL | 0x111);
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|
goto FPU_instruction_done;
|
|
}
|
|
(*st_instr_table[(int) instr_index]) ();
|
|
}
|
|
|
|
FPU_instruction_done:
|
|
|
|
ip_offset = FPU_entry_eip;
|
|
bswapw(code);
|
|
*(1 + (unsigned short *) &cs_selector) = code & 0x7ff;
|
|
|
|
#ifdef DEBUG
|
|
REENTRANT_CHECK(OFF);
|
|
emu_printall();
|
|
REENTRANT_CHECK(ON);
|
|
#endif /* DEBUG */
|
|
#ifdef LOOKAHEAD_LIMIT
|
|
if (--lookahead_limit)
|
|
#endif
|
|
if (FPU_lookahead) {
|
|
unsigned char next;
|
|
|
|
/* (This test should generate no machine code) */
|
|
while (1) {
|
|
REENTRANT_CHECK(OFF);
|
|
next = fubyte((u_char *) FPU_EIP);
|
|
REENTRANT_CHECK(ON);
|
|
if (((next & 0xf8) == 0xd8) || (next == 0x9b)) { /* fwait */
|
|
goto do_another_FPU_instruction;
|
|
} else
|
|
if (next == 0x66) { /* size prefix */
|
|
REENTRANT_CHECK(OFF);
|
|
next = fubyte((u_char *) (FPU_EIP + 1));
|
|
REENTRANT_CHECK(ON);
|
|
if ((next & 0xf8) == 0xd8) {
|
|
FPU_EIP++;
|
|
goto do_another_FPU_instruction;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
REENTRANT_CHECK(OFF);
|
|
return (0); /* --pink-- */
|
|
}
|
|
|
|
static int
|
|
gnufpu_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
if (pmath_emulate) {
|
|
printf("Another Math emulator already present\n");
|
|
return EACCES;
|
|
}
|
|
pmath_emulate = math_emulate;
|
|
if (bootverbose)
|
|
printf("GPL Math emulator present\n");
|
|
break;
|
|
case MOD_UNLOAD:
|
|
if (pmath_emulate != math_emulate) {
|
|
printf("Cannot unload another math emulator\n");
|
|
return EACCES;
|
|
}
|
|
pmath_emulate = 0;
|
|
if (bootverbose)
|
|
printf("GPL Math emulator unloaded\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
|
|
}
|
|
static moduledata_t gnufpumod = {
|
|
"gnufpu",
|
|
gnufpu_modevent,
|
|
0
|
|
};
|
|
DECLARE_MODULE(gnufpu, gnufpumod, SI_SUB_DRIVERS, SI_ORDER_ANY);
|