451ab91e |
1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
2 | * Mupen64plus - rjump.c * |
3 | * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ * |
4 | * Copyright (C) 2002 Hacktarux * |
5 | * * |
6 | * This program is free software; you can redistribute it and/or modify * |
7 | * it under the terms of the GNU General Public License as published by * |
8 | * the Free Software Foundation; either version 2 of the License, or * |
9 | * (at your option) any later version. * |
10 | * * |
11 | * This program is distributed in the hope that it will be useful, * |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
14 | * GNU General Public License for more details. * |
15 | * * |
16 | * You should have received a copy of the GNU General Public License * |
17 | * along with this program; if not, write to the * |
18 | * Free Software Foundation, Inc., * |
19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * |
20 | * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
21 | |
22 | #include <stdlib.h> |
23 | |
24 | #include "api/m64p_types.h" |
25 | #include "api/callbacks.h" |
26 | #include "r4300/recomp.h" |
27 | #include "r4300/r4300.h" |
28 | #include "r4300/macros.h" |
29 | #include "r4300/ops.h" |
30 | #include "r4300/recomph.h" |
31 | |
32 | #ifdef __GNUC__ |
33 | # define ASM_NAME(name) asm(name) |
34 | #else |
35 | # define ASM_NAME(name) |
36 | #endif |
37 | |
38 | static long save_ebp ASM_NAME("save_ebp") = 0; |
39 | static long save_ebx ASM_NAME("save_ebx") = 0; |
40 | static long save_esi ASM_NAME("save_esi") = 0; |
41 | static long save_edi ASM_NAME("save_edi") = 0; |
42 | static long save_esp ASM_NAME("save_esp") = 0; |
43 | static long save_eip ASM_NAME("save_eip") = 0; |
44 | |
45 | // that's where the dynarec will restart when going back from a C function |
46 | static unsigned long *return_address ASM_NAME("return_address"); |
47 | |
48 | void dyna_jump() |
49 | { |
50 | if (stop == 1) |
51 | { |
52 | dyna_stop(); |
53 | return; |
54 | } |
55 | |
56 | if (PC->reg_cache_infos.need_map) |
57 | *return_address = (unsigned long) (PC->reg_cache_infos.jump_wrapper); |
58 | else |
59 | *return_address = (unsigned long) (actual->code + PC->local_addr); |
60 | } |
61 | |
62 | #if defined(WIN32) && !defined(__GNUC__) /* this warning disable only works if placed outside of the scope of a function */ |
63 | #pragma warning(disable:4731) /* frame pointer register 'ebp' modified by inline assembly code */ |
64 | #endif |
65 | |
66 | void dyna_start(void *code) |
67 | { |
68 | /* save the base and stack pointers */ |
69 | /* make a call and a pop to retrieve the instruction pointer and save it too */ |
70 | /* then call the code(), which should theoretically never return. */ |
71 | /* When dyna_stop() sets the *return_address to the saved EIP, the emulator thread will come back here. */ |
72 | /* It will jump to label 2, restore the base and stack pointers, and exit this function */ |
73 | #if defined(WIN32) && !defined(__GNUC__) |
74 | __asm |
75 | { |
76 | mov save_ebp, ebp |
77 | mov save_esp, esp |
78 | mov save_ebx, ebx |
79 | mov save_esi, esi |
80 | mov save_edi, edi |
81 | call point1 |
82 | jmp point2 |
83 | point1: |
84 | pop eax |
85 | mov save_eip, eax |
86 | |
87 | sub esp, 0x10 |
88 | and esp, 0xfffffff0 |
89 | mov return_address, esp |
90 | sub return_address, 4 |
91 | |
92 | mov eax, code |
93 | call eax |
94 | point2: |
95 | mov ebp, save_ebp |
96 | mov esp, save_esp |
97 | mov ebx, save_ebx |
98 | mov esi, save_esi |
99 | mov edi, save_edi |
100 | } |
101 | #elif defined(__GNUC__) && defined(__i386__) |
102 | #if defined(__PIC__) |
103 | /* for -fPIC (shared libraries) */ |
104 | #if __GNUC_PREREQ (4, 7) |
105 | # define GET_PC_THUNK_STR(reg) "__x86.get_pc_thunk." #reg |
106 | #else |
107 | # define GET_PC_THUNK_STR(reg) "__i686.get_pc_thunk." #reg |
108 | #endif |
109 | #define STORE_EBX |
110 | #define LOAD_EBX "call " GET_PC_THUNK_STR(bx) " \n" \ |
111 | "addl $_GLOBAL_OFFSET_TABLE_, %%ebx \n" |
112 | #else |
113 | /* for non-PIC binaries */ |
114 | #define STORE_EBX "movl %%ebx, %[save_ebx] \n" |
115 | #define LOAD_EBX "movl %[save_ebx], %%ebx \n" |
116 | #endif |
117 | |
118 | asm volatile |
119 | (STORE_EBX |
120 | " movl %%ebp, %[save_ebp] \n" |
121 | " movl %%esp, %[save_esp] \n" |
122 | " movl %%esi, %[save_esi] \n" |
123 | " movl %%edi, %[save_edi] \n" |
124 | " call 1f \n" |
125 | " jmp 2f \n" |
126 | "1: \n" |
127 | " popl %%eax \n" |
128 | " movl %%eax, %[save_eip] \n" |
129 | |
130 | " subl $16, %%esp \n" /* save 16 bytes of padding just in case */ |
131 | " andl $-16, %%esp \n" /* align stack on 16-byte boundary for OSX */ |
132 | " movl %%esp, %[return_address] \n" |
133 | " subl $4, %[return_address] \n" |
134 | |
135 | " call *%[codeptr] \n" |
136 | "2: \n" |
137 | LOAD_EBX |
138 | " movl %[save_ebp], %%ebp \n" |
139 | " movl %[save_esp], %%esp \n" |
140 | " movl %[save_esi], %%esi \n" |
141 | " movl %[save_edi], %%edi \n" |
142 | : [save_ebp]"=m"(save_ebp), [save_esp]"=m"(save_esp), [save_ebx]"=m"(save_ebx), [save_esi]"=m"(save_esi), [save_edi]"=m"(save_edi), [save_eip]"=m"(save_eip), [return_address]"=m"(return_address) |
143 | : [codeptr]"r"(code) |
144 | : "eax", "ecx", "edx", "memory" |
145 | ); |
146 | #endif |
147 | |
148 | /* clear the registers so we don't return here a second time; that would be a bug */ |
149 | /* this is also necessary to prevent compiler from optimizing out the static variables */ |
150 | save_edi=0; |
151 | save_esi=0; |
152 | save_ebx=0; |
153 | save_ebp=0; |
154 | save_esp=0; |
155 | save_eip=0; |
156 | } |
157 | |
158 | void dyna_stop() |
159 | { |
160 | if (save_eip == 0) |
161 | DebugMessage(M64MSG_WARNING, "instruction pointer is 0 at dyna_stop()"); |
162 | else |
163 | { |
164 | *return_address = (unsigned long) save_eip; |
165 | } |
166 | } |
167 | |