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1 | 31e31b8a | bellard | /*
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2 | 3ef693a0 | bellard | * qemu 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 | 3ef693a0 | bellard | #include "qemu.h" |
28 | 31e31b8a | bellard | |
29 | 0ecfa993 | bellard | #include "cpu-i386.h" |
30 | 31e31b8a | bellard | |
31 | 3ef693a0 | bellard | #define DEBUG_LOGFILE "/tmp/qemu.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 | 9de5e440 | bellard | /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
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37 | 9de5e440 | bellard | we allocate a bigger stack. Need a better solution, for example
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38 | 9de5e440 | bellard | by remapping the process stack directly at the right place */
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39 | 9de5e440 | bellard | unsigned long x86_stack_size = 512 * 1024; |
40 | 31e31b8a | bellard | unsigned long stktop; |
41 | 31e31b8a | bellard | |
42 | 31e31b8a | bellard | void gemu_log(const char *fmt, ...) |
43 | 31e31b8a | bellard | { |
44 | 31e31b8a | bellard | va_list ap; |
45 | 31e31b8a | bellard | |
46 | 31e31b8a | bellard | va_start(ap, fmt); |
47 | 31e31b8a | bellard | vfprintf(stderr, fmt, ap); |
48 | 31e31b8a | bellard | va_end(ap); |
49 | 31e31b8a | bellard | } |
50 | 31e31b8a | bellard | |
51 | 31e31b8a | bellard | /***********************************************************/
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52 | 0ecfa993 | bellard | /* CPUX86 core interface */
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53 | 367e86e8 | bellard | |
54 | ba1c6e37 | bellard | void cpu_x86_outb(int addr, int val) |
55 | 367e86e8 | bellard | { |
56 | 367e86e8 | bellard | fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
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57 | 367e86e8 | bellard | } |
58 | 367e86e8 | bellard | |
59 | ba1c6e37 | bellard | void cpu_x86_outw(int addr, int val) |
60 | 367e86e8 | bellard | { |
61 | 367e86e8 | bellard | fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
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62 | 367e86e8 | bellard | } |
63 | 367e86e8 | bellard | |
64 | ba1c6e37 | bellard | void cpu_x86_outl(int addr, int val) |
65 | 367e86e8 | bellard | { |
66 | 367e86e8 | bellard | fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
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67 | 367e86e8 | bellard | } |
68 | 367e86e8 | bellard | |
69 | ba1c6e37 | bellard | int cpu_x86_inb(int addr) |
70 | 367e86e8 | bellard | { |
71 | 367e86e8 | bellard | fprintf(stderr, "inb: port=0x%04x\n", addr);
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72 | 367e86e8 | bellard | return 0; |
73 | 367e86e8 | bellard | } |
74 | 367e86e8 | bellard | |
75 | ba1c6e37 | bellard | int cpu_x86_inw(int addr) |
76 | 367e86e8 | bellard | { |
77 | 367e86e8 | bellard | fprintf(stderr, "inw: port=0x%04x\n", addr);
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78 | 367e86e8 | bellard | return 0; |
79 | 367e86e8 | bellard | } |
80 | 367e86e8 | bellard | |
81 | ba1c6e37 | bellard | int cpu_x86_inl(int addr) |
82 | 367e86e8 | bellard | { |
83 | 367e86e8 | bellard | fprintf(stderr, "inl: port=0x%04x\n", addr);
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84 | 367e86e8 | bellard | return 0; |
85 | 367e86e8 | bellard | } |
86 | 367e86e8 | bellard | |
87 | 6dbad63e | bellard | void write_dt(void *ptr, unsigned long addr, unsigned long limit, |
88 | 6dbad63e | bellard | int seg32_bit)
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89 | 6dbad63e | bellard | { |
90 | 6dbad63e | bellard | unsigned int e1, e2, limit_in_pages; |
91 | 6dbad63e | bellard | limit_in_pages = 0;
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92 | 6dbad63e | bellard | if (limit > 0xffff) { |
93 | 6dbad63e | bellard | limit = limit >> 12;
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94 | 6dbad63e | bellard | limit_in_pages = 1;
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95 | 6dbad63e | bellard | } |
96 | 6dbad63e | bellard | e1 = (addr << 16) | (limit & 0xffff); |
97 | 6dbad63e | bellard | e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); |
98 | 6dbad63e | bellard | e2 |= limit_in_pages << 23; /* byte granularity */ |
99 | 6dbad63e | bellard | e2 |= seg32_bit << 22; /* 32 bit segment */ |
100 | 6dbad63e | bellard | stl((uint8_t *)ptr, e1); |
101 | 6dbad63e | bellard | stl((uint8_t *)ptr + 4, e2);
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102 | 6dbad63e | bellard | } |
103 | 6dbad63e | bellard | |
104 | 6dbad63e | bellard | uint64_t gdt_table[6];
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105 | 31e31b8a | bellard | |
106 | 1b6b029e | bellard | void cpu_loop(struct CPUX86State *env) |
107 | 1b6b029e | bellard | { |
108 | 9de5e440 | bellard | int err;
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109 | 9de5e440 | bellard | uint8_t *pc; |
110 | 9de5e440 | bellard | target_siginfo_t info; |
111 | 9de5e440 | bellard | |
112 | 1b6b029e | bellard | for(;;) {
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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 | 9de5e440 | bellard | /* XXX: more precise info */
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130 | 9de5e440 | bellard | info.si_signo = SIGSEGV; |
131 | 9de5e440 | bellard | info.si_errno = 0;
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132 | 9de5e440 | bellard | info.si_code = 0;
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133 | 9de5e440 | bellard | info._sifields._sigfault._addr = 0;
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134 | 9de5e440 | bellard | queue_signal(info.si_signo, &info); |
135 | 1b6b029e | bellard | } |
136 | 1b6b029e | bellard | break;
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137 | 9de5e440 | bellard | case EXCP00_DIVZ:
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138 | 9de5e440 | bellard | /* division by zero */
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139 | 9de5e440 | bellard | info.si_signo = SIGFPE; |
140 | 9de5e440 | bellard | info.si_errno = 0;
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141 | 9de5e440 | bellard | info.si_code = TARGET_FPE_INTDIV; |
142 | 9de5e440 | bellard | info._sifields._sigfault._addr = env->eip; |
143 | 9de5e440 | bellard | queue_signal(info.si_signo, &info); |
144 | 9de5e440 | bellard | break;
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145 | 9de5e440 | bellard | case EXCP04_INTO:
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146 | 9de5e440 | bellard | case EXCP05_BOUND:
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147 | 9de5e440 | bellard | info.si_signo = SIGSEGV; |
148 | 9de5e440 | bellard | info.si_errno = 0;
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149 | 9de5e440 | bellard | info.si_code = 0;
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150 | 9de5e440 | bellard | info._sifields._sigfault._addr = 0;
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151 | 9de5e440 | bellard | queue_signal(info.si_signo, &info); |
152 | 9de5e440 | bellard | break;
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153 | 9de5e440 | bellard | case EXCP06_ILLOP:
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154 | 9de5e440 | bellard | info.si_signo = SIGILL; |
155 | 9de5e440 | bellard | info.si_errno = 0;
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156 | 9de5e440 | bellard | info.si_code = TARGET_ILL_ILLOPN; |
157 | 9de5e440 | bellard | info._sifields._sigfault._addr = env->eip; |
158 | 9de5e440 | bellard | queue_signal(info.si_signo, &info); |
159 | 9de5e440 | bellard | break;
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160 | 9de5e440 | bellard | case EXCP_INTERRUPT:
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161 | 9de5e440 | bellard | /* just indicate that signals should be handled asap */
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162 | 9de5e440 | bellard | break;
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163 | 1b6b029e | bellard | default:
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164 | 9de5e440 | bellard | fprintf(stderr, "0x%08lx: Unknown exception CPU %d, aborting\n",
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165 | 1b6b029e | bellard | (long)pc, err);
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166 | 1b6b029e | bellard | abort(); |
167 | 1b6b029e | bellard | } |
168 | 66fb9763 | bellard | process_pending_signals(env); |
169 | 1b6b029e | bellard | } |
170 | 1b6b029e | bellard | } |
171 | 1b6b029e | bellard | |
172 | 31e31b8a | bellard | void usage(void) |
173 | 31e31b8a | bellard | { |
174 | 3ef693a0 | bellard | printf("qemu version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
175 | 3ef693a0 | bellard | "usage: qemu [-d] program [arguments...]\n"
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176 | 31e31b8a | bellard | "Linux x86 emulator\n"
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177 | 31e31b8a | bellard | ); |
178 | 31e31b8a | bellard | exit(1);
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179 | 31e31b8a | bellard | } |
180 | 31e31b8a | bellard | |
181 | 9de5e440 | bellard | /* XXX: currently only used for async signals (see signal.c) */
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182 | 9de5e440 | bellard | CPUX86State *global_env; |
183 | 9de5e440 | bellard | |
184 | 31e31b8a | bellard | int main(int argc, char **argv) |
185 | 31e31b8a | bellard | { |
186 | 31e31b8a | bellard | const char *filename; |
187 | 01ffc75b | bellard | struct target_pt_regs regs1, *regs = ®s1;
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188 | 31e31b8a | bellard | struct image_info info1, *info = &info1;
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189 | 0ecfa993 | bellard | CPUX86State *env; |
190 | 586314f2 | bellard | int optind;
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191 | 31e31b8a | bellard | |
192 | 31e31b8a | bellard | if (argc <= 1) |
193 | 31e31b8a | bellard | usage(); |
194 | 586314f2 | bellard | loglevel = 0;
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195 | 586314f2 | bellard | optind = 1;
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196 | 586314f2 | bellard | if (argv[optind] && !strcmp(argv[optind], "-d")) { |
197 | 586314f2 | bellard | loglevel = 1;
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198 | 586314f2 | bellard | optind++; |
199 | 586314f2 | bellard | } |
200 | 586314f2 | bellard | filename = argv[optind]; |
201 | 586314f2 | bellard | |
202 | 586314f2 | bellard | /* init debug */
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203 | 586314f2 | bellard | if (loglevel) {
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204 | 586314f2 | bellard | logfile = fopen(DEBUG_LOGFILE, "w");
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205 | 586314f2 | bellard | if (!logfile) {
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206 | 586314f2 | bellard | perror(DEBUG_LOGFILE); |
207 | 586314f2 | bellard | exit(1);
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208 | 586314f2 | bellard | } |
209 | 586314f2 | bellard | setvbuf(logfile, NULL, _IOLBF, 0); |
210 | 586314f2 | bellard | } |
211 | 31e31b8a | bellard | |
212 | 31e31b8a | bellard | /* Zero out regs */
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213 | 01ffc75b | bellard | memset(regs, 0, sizeof(struct target_pt_regs)); |
214 | 31e31b8a | bellard | |
215 | 31e31b8a | bellard | /* Zero out image_info */
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216 | 31e31b8a | bellard | memset(info, 0, sizeof(struct image_info)); |
217 | 31e31b8a | bellard | |
218 | 4b74fe1f | bellard | if(elf_exec(filename, argv+optind, environ, regs, info) != 0) { |
219 | 31e31b8a | bellard | printf("Error loading %s\n", filename);
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220 | 31e31b8a | bellard | exit(1);
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221 | 31e31b8a | bellard | } |
222 | 31e31b8a | bellard | |
223 | 4b74fe1f | bellard | if (loglevel) {
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224 | 4b74fe1f | bellard | fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
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225 | 4b74fe1f | bellard | fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
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226 | 4b74fe1f | bellard | fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
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227 | 4b74fe1f | bellard | fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
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228 | 4b74fe1f | bellard | fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
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229 | 4b74fe1f | bellard | fprintf(logfile, "brk 0x%08lx\n" , info->brk);
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230 | 4b74fe1f | bellard | fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
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231 | 4b74fe1f | bellard | fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
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232 | 4b74fe1f | bellard | } |
233 | 31e31b8a | bellard | |
234 | 31e31b8a | bellard | target_set_brk((char *)info->brk);
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235 | 31e31b8a | bellard | syscall_init(); |
236 | 66fb9763 | bellard | signal_init(); |
237 | 31e31b8a | bellard | |
238 | 0ecfa993 | bellard | env = cpu_x86_init(); |
239 | 9de5e440 | bellard | global_env = env; |
240 | 0ecfa993 | bellard | |
241 | 6dbad63e | bellard | /* linux register setup */
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242 | 0ecfa993 | bellard | env->regs[R_EAX] = regs->eax; |
243 | 0ecfa993 | bellard | env->regs[R_EBX] = regs->ebx; |
244 | 0ecfa993 | bellard | env->regs[R_ECX] = regs->ecx; |
245 | 0ecfa993 | bellard | env->regs[R_EDX] = regs->edx; |
246 | 0ecfa993 | bellard | env->regs[R_ESI] = regs->esi; |
247 | 0ecfa993 | bellard | env->regs[R_EDI] = regs->edi; |
248 | 0ecfa993 | bellard | env->regs[R_EBP] = regs->ebp; |
249 | 0ecfa993 | bellard | env->regs[R_ESP] = regs->esp; |
250 | dab2ed99 | bellard | env->eip = regs->eip; |
251 | 31e31b8a | bellard | |
252 | 6dbad63e | bellard | /* linux segment setup */
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253 | 6dbad63e | bellard | env->gdt.base = (void *)gdt_table;
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254 | 6dbad63e | bellard | env->gdt.limit = sizeof(gdt_table) - 1; |
255 | 6dbad63e | bellard | write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1); |
256 | 6dbad63e | bellard | write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1); |
257 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_CS, __USER_CS); |
258 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_DS, __USER_DS); |
259 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_ES, __USER_DS); |
260 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_SS, __USER_DS); |
261 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_FS, __USER_DS); |
262 | 6dbad63e | bellard | cpu_x86_load_seg(env, R_GS, __USER_DS); |
263 | 31e31b8a | bellard | |
264 | 1b6b029e | bellard | cpu_loop(env); |
265 | 1b6b029e | bellard | /* never exits */
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266 | 31e31b8a | bellard | return 0; |
267 | 31e31b8a | bellard | } |