📄 emumainalib.s
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/* Copyright 1991-2001 Wind River Systems, Inc. *//*modification history--------------------01f,28aug01,hdn replaced .align with .balign replaced FUNC with GTEXT/GDATA macros for global symbols. added FUNC / FUNC_LABEL assembly syntax has become more stringent for indirect call instructions. '*' prefix now needed.01e,12feb97,hdn fixed a bug in fxchs. (SPR#7920)01d,24oct96,yp stuck in a # in USSC mailing addr so cpp will work 01c,26sep95,hdn implemented USSW's latest emumain.s.01b,06sep95,hdn changed .comm to .lcomm to make them contiguous.01a,24jan95,hdn original US Software version.*/#* * * * * * * * * *# Filename: EMUMAIN.ASM## Copyright (C) 1990,1991 By# # United States Software Corporation# # 14215 N.W. Science Park Drive# # Portland, Oregon 97229## This software is furnished under a license and may be used# and copied only in accordance with the terms of such license# and with the inclusion of the above copyright notice.# This software or any other copies thereof may not be provided# or otherwise made available to any other person. No title to# and ownership of the software is hereby transferred.## The information in this software is subject to change without# notice and should not be construed as a commitment by United# States Software Corporation.## Version: See VSNLOG.TXT# Released: 1 March 1991##* * * * * * * * * *#define _ASMLANGUAGE#include "vxWorks.h"#include "asm.h" .data .globl FUNC(copyright_wind_river) .long FUNC(copyright_wind_river) .include "emuIncALib.s" .text .globl emuret,exret# extrn witoep:near,eptowi:near,sitoep:near,eptosi:near# extrn litoep:near,eptoli:near,pdtoep:near,eptopd:near# extrn fptoep:near,eptofp:near,dptoep:near,eptodp:near# extrn eptoep:near# extrn getqn:near# extrn epadd:near,epsub:near,epsubr:near,epmul:near# extrn epdiv:near,epdivr:near,eprem:near# extrn epcomp:near,epcomu:near,epexam:near,eptown:near,epsqrt:near# extrn rounde:near,roundx:near,exproc:near# extrn xtract:near,scale:near# extrn epf2xm1:near,epsin:near,epcos:near,eptan:near# extrn eplog:near,eplog1:near,epatan:near# extrn reduct:near# extrn exir_no:abs# extrn ENIRS:abs#DGROUP GROUP hwseg#CGROUP GROUP emuseg#hwseg segment RW page public 'DATA'# assume ds:DGROUP, es:DGROUP, ss:DGROUP .globl h_ctrl,h_stat,s_iptr,s_memp .lcomm s_stk,256 .lcomm s_fpsp,4 .lcomm s_iptr,4 .lcomm s_memp,4 .lcomm h_ctrl,4 .lcomm h_stat,4 .lcomm h_tag,4#hwseg ends #emuseg segment public USE32 'CODE'# assume cs:CGROUP# address tables for floating-point instructionsinstab: .long faddfp,fmulfp,fcomfp,fcompfp,fsubfp,fsubrfp,fdivfp,fdivrfp .long fldfp,NONE_,fstf,fstpf,fldenv_,fldcwc,fstenv_,fstcwc .long faddsi,fmulsi,fcomsi,fcompsi,fsubsi,fsubrsi,fdivsi,fdivrsi .long fldsi,NONE_,fisti,fistpi,NONE_,flde,NONE_,fstpe .long fadddp,fmuldp,fcomdp,fcompdp,fsubdp,fsubrdp,fdivdp,fdivrdp .long flddp,NONE_,fstd,fstpd,frstor_,NONE_,fsave_,fstsw_ .long faddwi,fmulwi,fcomwi,fcompwi,fsubwi,fsubrwi,fdivwi,fdivrwi .long fldwi,NONE_,fistw,fistpw,fbldp,fildl,fbstpp,fistplinstas: .long fadds,fmuls,fcoms,fcomps,fsubs,fsubrs,fdivs,fdivrs .long flds,fxchs,fnop_,fstps,is1,is8,is2,is3 .long NONE_,NONE_,NONE_,NONE_,NONE_,fucompps,NONE_,NONE_ .long NONE_,NONE_,NONE_,NONE_,is5,NONE_,NONE_,NONE_ .long faddx,fmulx,NONE_,NONE_,fsubx,fsubrx,fdivx,fdivrx .long ffree_,NONE_,fsts,fstps,fucoms,fucomps,NONE_,NONE_ .long faddpx,fmulpx,NONE_,fcompps,fsubpx,fsubrpx,fdivrpx,fdivpx .long NONE_,NONE_,NONE_,NONE_,fstswax_,NONE_,NONE_,NONE_ .balign 16,0x90 .globl GTEXT(emuInit)FUNC_LABEL(emuInit) fninit ret .balign 16,0x90 .globl GTEXT(emu387)FUNC_LABEL(emu387)# test byte ptr [esp+9],2 ;enable interrupts, unless they were .word ENIRS .byte 0x24,0x09,0x02 jz emu3 # disabled initially sti emu3: pusha #save all general registers subl $s_len,%esp #reserve a frame on the stack movl %esp,%ebp cld addl $12,s_sp(%ebp) movl s_ip(%ebp),%esi #address of FP instruction -> esiemu86: .byte 0x2e #from cs: but assembler seems defective lodsw #pick up the instruction cmpb $0x0d8,%al jc emu84 emu11: movl %eax,%edx #build 6-bit instruction index -> edx shlb $2,%dh rolw $3,%dx andl $0x3f,%edx movb %ah,%bl #build R/M code andl $7,%ebx # and leave in bl for the following cmpb $0x0c0,%ah #MOD 3 uses no memory addressing jnc emu50 xorl %edi,%edi #handle possible s-i-b cmpb $4,%bl jnz emu26 .byte 0x2e #from cs: lodsb movb %al,%bl andb $7,%bl shldl $31,%eax,%edi andl $7*4,%edi subl $4*4,%edi jz emu26 movb %al,%cl #scaled index shrb $6,%cl negl %edi movl s_di+28-16(%ebp,%edi),%edi shll %cl,%edi emu26: addb %ah,%ah #take displacement -> ax js emu24 # MOD 01 reg+d8 jc emu25 # MOD 10 reg+d32 cmpb $5,%bl # MOD 00 reg; reg5 = d32 jnz emu27 .byte 0x2e #from cs: lodsl jmp emu42 emu27: xorl %eax,%eax jmp emu29 emu25: .byte 0x2e #from cs: lodsl jmp emu29 emu24: .byte 0x2e #from cs: lodsb movsbl %al,%eax emu29: negl %ebx #add the base register addl s_di+28(%ebp,%ebx,4),%eax emu42: addl %edi,%eax #possible scaled index xchgl %esi,s_ip(%ebp) #update return address call *%cs:instab(,%edx,4) #call instruction handleremu51: movl s_ip(%ebp),%esi #if next instruction is ESC, repeat .byte 0x2e #from cs: but assembler seems defective lodsw xorb $0x0d8,%al cmpb $8,%al jc emu11 addl $s_len,%esp #free the stack frame popa #restore registersemuret: iret emu50: xchgl %esi,s_ip(%ebp) #update return address call *%cs:instas(,%edx,4) #call instruction handler jmp emu51 exret: addl $s_len,%esp #exception return popa .byte 0x0cd,EXIRNO #INT exception interrupt iret emu84: decl %esi #illegal prefix, skip jmp emu86 #emu387 endpintrn:flddp: #push from memory andb $0x0fd,h_stat+1 call dptoep #STPUSHP movl s_fpsp,%ebx subb $32,%bl cmpb $3,s_stk+10(%ebx) jnz stackof movl %ebx,s_fpsp addl $s_stk,%ebx movl %eax,(%ebx) movl %edx,4(%ebx) movl %ecx,8(%ebx) ret fstd: #fetch as double-precision #SAVEIX movl %eax,s_memp xchgl %esi,%eax movl %eax,s_iptr #STTOP movl s_fpsp,%edi addl $s_stk,%edi #GETEP movl (%edi),%eax movl 4(%edi),%edx movl 8(%edi),%ecx call eptodp movl %eax,(%esi) movl %edx,4(%esi) ret fstpd: #fetch as double-precision, pop #SAVEIX movl %eax,s_memp xchgl %esi,%eax movl %eax,s_iptr #STTOP movl s_fpsp,%edi addl $s_stk,%edi #GETEP movl (%edi),%eax movl 4(%edi),%edx movl 8(%edi),%ecx call eptodp movl %eax,(%esi) movl %edx,4(%esi) #STPOPq movb $3,10(%edi) addb $32,s_fpsp ret fadddp: #ST = ST + memory call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epadd jmp rounde fsubdp: #ST = ST - memory call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsubr jmp rounde fmuldp: #ST = ST * memory call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epmul jmp rounde fdivdp: #ST = ST / memory call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdivr jmp rounde fsubrdp: #ST = memory - ST call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsub jmp rounde fdivrdp: #ST = memory / ST call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdiv jmp rounde fsqrt_: #square-root of ST #STTOP movl s_fpsp,%edi addl $s_stk,%edi #GETEP movl (%edi),%eax movl 4(%edi),%edx movl 8(%edi),%ecx call epsqrt jmp rounde fcomdp: #ST - memory -> codes orb $0x45,h_stat+1 call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi jmp epcomp fcompdp: #ST - memory -> codes, pop orb $0x45,h_stat+1 call dptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epcomp #STPOPq movb $3,10(%edi) addb $32,s_fpsp ret faddfp: #ST = ST + memory call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epadd jmp rounde faddwi: #ST = ST + memory call witoep jmp .+7 faddsi: #ST = ST + memory call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epadd jmp rounde fmulfp: #ST = ST * memory call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epmul jmp rounde fmulwi: #ST = ST * memory call witoep jmp .+7 fmulsi: #ST = ST * memory call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epmul jmp rounde fcomfp: #ST - memory -> codes orb $0x45,h_stat+1 call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi jmp epcomp fcomsi: #ST - memory -> codes call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi jmp epcomp fcomwi: #ST - memory -> codes call witoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi jmp epcomp fcompfp: #ST - memory -> codes, pop orb $0x45,h_stat+1 call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epcomp #STPOPq movb $3,10(%edi) addb $32,s_fpsp ret fcompwi: #ST - memory -> codes, pop call witoep jmp .+7 fcompsi: #ST - memory -> codes, pop call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epcomp #STPOPq movb $3,10(%edi) addb $32,s_fpsp ret fsubfp: #ST = ST - memory call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsubr jmp rounde fsubwi: #ST = ST - memory call witoep jmp .+7 fsubsi: #ST = ST - memory call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsubr jmp rounde fsubrfp: #ST = memory - ST call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsub jmp rounde fsubrwi: #ST = memory - ST call witoep jmp .+7 fsubrsi: #ST = memory - ST call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epsub jmp rounde fdivfp: #ST = ST / memory call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdivr jmp rounde fdivwi: #ST = ST / memory call witoep jmp .+7 fdivsi: #ST = ST / memory call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdivr jmp rounde fdivrfp: #ST = memory / ST call fptoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdiv jmp rounde fdivrwi: #ST = memory / ST call witoep jmp .+7 fdivrsi: #ST = memory / ST call sitoep #STTOP movl s_fpsp,%edi addl $s_stk,%edi call epdiv jmp rounde fadds: #ST = ST + ST(i) #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epadd jmp rounde fmuls: #ST = ST * ST(i) #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epmul jmp rounde fcoms: #ST - ST(i) -> codes #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax jmp epcomp fcomps: #ST - ST(i) -> codes, pop #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epcomp #STPOPq movb $3,10(%edi) addb $32,s_fpsp ret fsubs: #ST = ST - ST(i) #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epsubr jmp rounde fsubrs: #ST = ST(i) - ST #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epsub jmp rounde fdivs: #ST = ST / ST(i) #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epdivr jmp rounde fdivrs: #ST = ST(i) / ST #SAVEIN movl %esi,s_iptr #GETEPS ebx movl s_fpsp,%eax movl %eax,%edi addl $s_stk,%edi shll $5,%ebx addb %bl,%al addl $s_stk,%eax movl 8(%eax),%ecx movl 4(%eax),%edx movl (%eax),%eax call epdiv jmp rounde fldfp: #push from memory andb $0x0fd,h_stat+1 call fptoep #STPUSHP movl s_fpsp,%ebx subb $32,%bl cmpb $3,s_stk+10(%ebx) jnz stackof movl %ebx,s_fpsp addl $s_stk,%ebx movl %eax,(%ebx) movl %edx,4(%ebx) movl %ecx,8(%ebx) ret ⌨️ 快捷键说明
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