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https://github.com/mupen64plus/mupen64plus-oldsvn.git
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129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Mupen64plus - rjump.c *
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* Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ *
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* Copyright (C) 2002 Hacktarux *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include <stdlib.h>
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#include "../recomp.h"
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#include "../r4300.h"
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#include "../macros.h"
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#include "../ops.h"
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#include "../recomph.h"
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extern int dynarec_stack_initialized; /* in gr4300.c */
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void dyna_jump()
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{
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if (stop == 1)
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{
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dyna_stop();
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return;
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}
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if (PC->reg_cache_infos.need_map)
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*return_address = (unsigned long) (PC->reg_cache_infos.jump_wrapper);
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else
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*return_address = (unsigned long) (actual->code + PC->local_addr);
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}
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#ifdef __GNUC__
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# define ASM_NAME(name) asm(name)
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#else
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# define ASM_NAME(name)
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#endif
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static long save_ebp ASM_NAME("save_ebp") = 0;
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static long save_ebx ASM_NAME("save_ebx") = 0;
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static long save_esi ASM_NAME("save_esi") = 0;
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static long save_edi ASM_NAME("save_edi") = 0;
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static long save_esp ASM_NAME("save_esp") = 0;
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static long save_eip ASM_NAME("save_eip") = 0;
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void dyna_start(void (*code)())
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{
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/* save the base and stack pointers */
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/* make a call and a pop to retrieve the instruction pointer and save it too */
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/* then call the code(), which should theoretically never return. */
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/* When dyna_stop() sets the *return_address to the saved EIP, the emulator thread will come back here. */
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/* It will jump to label 2, restore the base and stack pointers, and exit this function */
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#if defined(_WIN32) && !defined(__GNUC__)
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__asm
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{
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mov _save_ebp, ebp
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mov _save_esp, esp
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call point1
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jmp point2
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point1:
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pop eax
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mov _save_eip, eax
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mov eax, code
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call eax
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point2:
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mov ebp, _save_ebp
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mov esp, _save_esp
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}
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#elif defined(__GNUC__) && defined(__i386__)
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asm volatile
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(" movl %%ebp, save_ebp \n"
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" movl %%esp, save_esp \n"
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" movl %%ebx, save_ebx \n"
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" movl %%esi, save_esi \n"
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" movl %%edi, save_edi \n"
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" call 1f \n"
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" jmp 2f \n"
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"1: \n"
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" popl %%eax \n"
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" movl %%eax, save_eip \n"
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" call *%[codeptr] \n"
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"2: \n"
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" movl save_ebp, %%ebp \n"
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" movl save_esp, %%esp \n"
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" movl save_ebx, %%ebx \n"
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" movl save_esi, %%esi \n"
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" movl save_edi, %%edi \n"
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:
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: [codeptr]"r"(code)
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: "eax", "ecx", "edx", "memory"
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);
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#endif
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/* clear flag; stack is back to normal */
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dynarec_stack_initialized = 0;
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/* clear the registers so we don't return here a second time; that would be a bug */
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/* this is also necessary to prevent compiler from optimizing out the static variables */
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save_edi=0;
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save_esi=0;
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save_ebx=0;
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save_ebp=0;
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save_esp=0;
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save_eip=0;
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}
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void dyna_stop()
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{
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if (save_eip == 0)
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printf("Warning: instruction pointer is 0 at dyna_stop()\n");
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else
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{
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*return_address = (unsigned long) save_eip;
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}
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}
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