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1 | 31e31b8a | bellard | /*
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2 | 6dbad63e | bellard | * gemu main
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3 | 31e31b8a | bellard | *
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4 | 31e31b8a | bellard | * Copyright (c) 2003 Fabrice Bellard
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5 | 31e31b8a | bellard | *
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6 | 31e31b8a | bellard | * This program is free software; you can redistribute it and/or modify
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7 | 31e31b8a | bellard | * it under the terms of the GNU General Public License as published by
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8 | 31e31b8a | bellard | * the Free Software Foundation; either version 2 of the License, or
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9 | 31e31b8a | bellard | * (at your option) any later version.
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10 | 31e31b8a | bellard | *
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11 | 31e31b8a | bellard | * This program is distributed in the hope that it will be useful,
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12 | 31e31b8a | bellard | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | 31e31b8a | bellard | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | 31e31b8a | bellard | * GNU General Public License for more details.
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15 | 31e31b8a | bellard | *
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16 | 31e31b8a | bellard | * You should have received a copy of the GNU General Public License
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17 | 31e31b8a | bellard | * along with this program; if not, write to the Free Software
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18 | 31e31b8a | bellard | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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19 | 31e31b8a | bellard | */
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20 | 31e31b8a | bellard | #include <stdlib.h> |
21 | 31e31b8a | bellard | #include <stdio.h> |
22 | 31e31b8a | bellard | #include <stdarg.h> |
23 | 04369ff2 | bellard | #include <string.h> |
24 | 31e31b8a | bellard | #include <errno.h> |
25 | 0ecfa993 | bellard | #include <unistd.h> |
26 | 31e31b8a | bellard | |
27 | 31e31b8a | bellard | #include "gemu.h" |
28 | 31e31b8a | bellard | |
29 | 0ecfa993 | bellard | #include "cpu-i386.h" |
30 | 31e31b8a | bellard | |
31 | 586314f2 | bellard | #define DEBUG_LOGFILE "/tmp/gemu.log" |
32 | 586314f2 | bellard | |
33 | 586314f2 | bellard | FILE *logfile = NULL;
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34 | 586314f2 | bellard | int loglevel;
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35 | 586314f2 | bellard | |
36 | 31e31b8a | bellard | unsigned long x86_stack_size; |
37 | 31e31b8a | bellard | unsigned long stktop; |
38 | 31e31b8a | bellard | |
39 | 31e31b8a | bellard | void gemu_log(const char *fmt, ...) |
40 | 31e31b8a | bellard | { |
41 | 31e31b8a | bellard | va_list ap; |
42 | 31e31b8a | bellard | |
43 | 31e31b8a | bellard | va_start(ap, fmt); |
44 | 31e31b8a | bellard | vfprintf(stderr, fmt, ap); |
45 | 31e31b8a | bellard | va_end(ap); |
46 | 31e31b8a | bellard | } |
47 | 31e31b8a | bellard | |
48 | 31e31b8a | bellard | /***********************************************************/
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49 | 0ecfa993 | bellard | /* CPUX86 core interface */
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50 | 367e86e8 | bellard | |
51 | ba1c6e37 | bellard | void cpu_x86_outb(int addr, int val) |
52 | 367e86e8 | bellard | { |
53 | 367e86e8 | bellard | fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
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54 | 367e86e8 | bellard | } |
55 | 367e86e8 | bellard | |
56 | ba1c6e37 | bellard | void cpu_x86_outw(int addr, int val) |
57 | 367e86e8 | bellard | { |
58 | 367e86e8 | bellard | fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
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59 | 367e86e8 | bellard | } |
60 | 367e86e8 | bellard | |
61 | ba1c6e37 | bellard | void cpu_x86_outl(int addr, int val) |
62 | 367e86e8 | bellard | { |
63 | 367e86e8 | bellard | fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
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64 | 367e86e8 | bellard | } |
65 | 367e86e8 | bellard | |
66 | ba1c6e37 | bellard | int cpu_x86_inb(int addr) |
67 | 367e86e8 | bellard | { |
68 | 367e86e8 | bellard | fprintf(stderr, "inb: port=0x%04x\n", addr);
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69 | 367e86e8 | bellard | return 0; |
70 | 367e86e8 | bellard | } |
71 | 367e86e8 | bellard | |
72 | ba1c6e37 | bellard | int cpu_x86_inw(int addr) |
73 | 367e86e8 | bellard | { |
74 | 367e86e8 | bellard | fprintf(stderr, "inw: port=0x%04x\n", addr);
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75 | 367e86e8 | bellard | return 0; |
76 | 367e86e8 | bellard | } |
77 | 367e86e8 | bellard | |
78 | ba1c6e37 | bellard | int cpu_x86_inl(int addr) |
79 | 367e86e8 | bellard | { |
80 | 367e86e8 | bellard | fprintf(stderr, "inl: port=0x%04x\n", addr);
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81 | 367e86e8 | bellard | return 0; |
82 | 367e86e8 | bellard | } |
83 | 367e86e8 | bellard | |
84 | 6dbad63e | bellard | /* default linux values for the selectors */
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85 | 6dbad63e | bellard | #define __USER_CS (0x23) |
86 | 6dbad63e | bellard | #define __USER_DS (0x2B) |
87 | 31e31b8a | bellard | |
88 | 6dbad63e | bellard | void write_dt(void *ptr, unsigned long addr, unsigned long limit, |
89 | 6dbad63e | bellard | int seg32_bit)
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90 | 6dbad63e | bellard | { |
91 | 6dbad63e | bellard | unsigned int e1, e2, limit_in_pages; |
92 | 6dbad63e | bellard | limit_in_pages = 0;
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93 | 6dbad63e | bellard | if (limit > 0xffff) { |
94 | 6dbad63e | bellard | limit = limit >> 12;
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95 | 6dbad63e | bellard | limit_in_pages = 1;
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96 | 6dbad63e | bellard | } |
97 | 6dbad63e | bellard | e1 = (addr << 16) | (limit & 0xffff); |
98 | 6dbad63e | bellard | e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); |
99 | 6dbad63e | bellard | e2 |= limit_in_pages << 23; /* byte granularity */ |
100 | 6dbad63e | bellard | e2 |= seg32_bit << 22; /* 32 bit segment */ |
101 | 6dbad63e | bellard | stl((uint8_t *)ptr, e1); |
102 | 6dbad63e | bellard | stl((uint8_t *)ptr + 4, e2);
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103 | 6dbad63e | bellard | } |
104 | 6dbad63e | bellard | |
105 | 6dbad63e | bellard | uint64_t gdt_table[6];
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106 | 31e31b8a | bellard | |
107 | 1b6b029e | bellard | void cpu_loop(struct CPUX86State *env) |
108 | 1b6b029e | bellard | { |
109 | 1b6b029e | bellard | for(;;) {
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110 | 1b6b029e | bellard | int err;
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111 | 1b6b029e | bellard | uint8_t *pc; |
112 | 1b6b029e | bellard | |
113 | 1b6b029e | bellard | err = cpu_x86_exec(env); |
114 | 1b6b029e | bellard | pc = env->seg_cache[R_CS].base + env->eip; |
115 | 1b6b029e | bellard | switch(err) {
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116 | 1b6b029e | bellard | case EXCP0D_GPF:
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117 | 1b6b029e | bellard | if (pc[0] == 0xcd && pc[1] == 0x80) { |
118 | 1b6b029e | bellard | /* syscall */
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119 | 1b6b029e | bellard | env->eip += 2;
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120 | 1b6b029e | bellard | env->regs[R_EAX] = do_syscall(env, |
121 | 1b6b029e | bellard | env->regs[R_EAX], |
122 | 1b6b029e | bellard | env->regs[R_EBX], |
123 | 1b6b029e | bellard | env->regs[R_ECX], |
124 | 1b6b029e | bellard | env->regs[R_EDX], |
125 | 1b6b029e | bellard | env->regs[R_ESI], |
126 | 1b6b029e | bellard | env->regs[R_EDI], |
127 | 1b6b029e | bellard | env->regs[R_EBP]); |
128 | 1b6b029e | bellard | } else {
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129 | 1b6b029e | bellard | goto trap_error;
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130 | 1b6b029e | bellard | } |
131 | 1b6b029e | bellard | break;
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132 | 1b6b029e | bellard | default:
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133 | 1b6b029e | bellard | trap_error:
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134 | 1b6b029e | bellard | fprintf(stderr, "0x%08lx: Unknown exception %d, aborting\n",
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135 | 1b6b029e | bellard | (long)pc, err);
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136 | 1b6b029e | bellard | abort(); |
137 | 1b6b029e | bellard | } |
138 | 1b6b029e | bellard | } |
139 | 1b6b029e | bellard | } |
140 | 1b6b029e | bellard | |
141 | 31e31b8a | bellard | void usage(void) |
142 | 31e31b8a | bellard | { |
143 | 27362c82 | bellard | printf("gemu version " GEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
144 | 586314f2 | bellard | "usage: gemu [-d] program [arguments...]\n"
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145 | 31e31b8a | bellard | "Linux x86 emulator\n"
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146 | 31e31b8a | bellard | ); |
147 | 31e31b8a | bellard | exit(1);
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148 | 31e31b8a | bellard | } |
149 | 31e31b8a | bellard | |
150 | 31e31b8a | bellard | int main(int argc, char **argv) |
151 | 31e31b8a | bellard | { |
152 | 31e31b8a | bellard | const char *filename; |
153 | 01ffc75b | bellard | struct target_pt_regs regs1, *regs = ®s1;
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154 | 31e31b8a | bellard | struct image_info info1, *info = &info1;
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155 | 0ecfa993 | bellard | CPUX86State *env; |
156 | 586314f2 | bellard | int optind;
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157 | 31e31b8a | bellard | |
158 | 31e31b8a | bellard | if (argc <= 1) |
159 | 31e31b8a | bellard | usage(); |
160 | 586314f2 | bellard | loglevel = 0;
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161 | 586314f2 | bellard | optind = 1;
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162 | 586314f2 | bellard | if (argv[optind] && !strcmp(argv[optind], "-d")) { |
163 | 586314f2 | bellard | loglevel = 1;
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164 | 586314f2 | bellard | optind++; |
165 | 586314f2 | bellard | } |
166 | 586314f2 | bellard | filename = argv[optind]; |
167 | 586314f2 | bellard | |
168 | 586314f2 | bellard | /* init debug */
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169 | 586314f2 | bellard | if (loglevel) {
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170 | 586314f2 | bellard | logfile = fopen(DEBUG_LOGFILE, "w");
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171 | 586314f2 | bellard | if (!logfile) {
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172 | 586314f2 | bellard | perror(DEBUG_LOGFILE); |
173 | 586314f2 | bellard | exit(1);
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174 | 586314f2 | bellard | } |
175 | 586314f2 | bellard | setvbuf(logfile, NULL, _IOLBF, 0); |
176 | 586314f2 | bellard | } |
177 | 31e31b8a | bellard | |
178 | 31e31b8a | bellard | /* Zero out regs */
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179 | 01ffc75b | bellard | memset(regs, 0, sizeof(struct target_pt_regs)); |
180 | 31e31b8a | bellard | |
181 | 31e31b8a | bellard | /* Zero out image_info */
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182 | 31e31b8a | bellard | memset(info, 0, sizeof(struct image_info)); |
183 | 31e31b8a | bellard | |
184 | 4b74fe1f | bellard | if(elf_exec(filename, argv+optind, environ, regs, info) != 0) { |
185 | 31e31b8a | bellard | printf("Error loading %s\n", filename);
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186 | 31e31b8a | bellard | exit(1);
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187 | 31e31b8a | bellard | } |
188 | 31e31b8a | bellard | |
189 | 4b74fe1f | bellard | if (loglevel) {
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190 | 4b74fe1f | bellard | fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
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191 | 4b74fe1f | bellard | fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
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192 | 4b74fe1f | bellard | fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
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193 | 4b74fe1f | bellard | fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
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194 | 4b74fe1f | bellard | fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
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195 | 4b74fe1f | bellard | fprintf(logfile, "brk 0x%08lx\n" , info->brk);
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196 | 4b74fe1f | bellard | fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
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197 | 4b74fe1f | bellard | fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
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198 | 4b74fe1f | bellard | } |
199 | 31e31b8a | bellard | |
200 | 31e31b8a | bellard | target_set_brk((char *)info->brk);
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201 | 31e31b8a | bellard | syscall_init(); |
202 | 31e31b8a | bellard | |
203 | 0ecfa993 | bellard | env = cpu_x86_init(); |
204 | 0ecfa993 | bellard | |
205 | 6dbad63e | bellard | /* linux register setup */
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206 | 0ecfa993 | bellard | env->regs[R_EAX] = regs->eax; |
207 | 0ecfa993 | bellard | env->regs[R_EBX] = regs->ebx; |
208 | 0ecfa993 | bellard | env->regs[R_ECX] = regs->ecx; |
209 | 0ecfa993 | bellard | env->regs[R_EDX] = regs->edx; |
210 | 0ecfa993 | bellard | env->regs[R_ESI] = regs->esi; |
211 | 0ecfa993 | bellard | env->regs[R_EDI] = regs->edi; |
212 | 0ecfa993 | bellard | env->regs[R_EBP] = regs->ebp; |
213 | 0ecfa993 | bellard | env->regs[R_ESP] = regs->esp; |
214 | dab2ed99 | bellard | env->eip = regs->eip; |
215 | 31e31b8a | bellard | |
216 | 6dbad63e | bellard | /* linux segment setup */
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217 | 6dbad63e | bellard | env->gdt.base = (void *)gdt_table;
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218 | 6dbad63e | bellard | env->gdt.limit = sizeof(gdt_table) - 1; |
219 | 6dbad63e | bellard | write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1); |
220 | 6dbad63e | bellard | write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1); |
221 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_CS, __USER_CS); |
222 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_DS, __USER_DS); |
223 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_ES, __USER_DS); |
224 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_SS, __USER_DS); |
225 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_FS, __USER_DS); |
226 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_GS, __USER_DS); |
227 | 31e31b8a | bellard | |
228 | 1b6b029e | bellard | cpu_loop(env); |
229 | 1b6b029e | bellard | /* never exits */
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230 | 31e31b8a | bellard | return 0; |
231 | 31e31b8a | bellard | } |