4 * Copyright (c) 2003 Fabrice Bellard
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
31 #define DEBUG_LOGFILE "/tmp/qemu.log"
36 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
37 we allocate a bigger stack. Need a better solution, for example
38 by remapping the process stack directly at the right place */
39 unsigned long x86_stack_size = 512 * 1024;
42 void gemu_log(const char *fmt, ...)
47 vfprintf(stderr, fmt, ap);
51 /***********************************************************/
52 /* CPUX86 core interface */
54 void cpu_x86_outb(int addr, int val)
56 fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
59 void cpu_x86_outw(int addr, int val)
61 fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
64 void cpu_x86_outl(int addr, int val)
66 fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
69 int cpu_x86_inb(int addr)
71 fprintf(stderr, "inb: port=0x%04x\n", addr);
75 int cpu_x86_inw(int addr)
77 fprintf(stderr, "inw: port=0x%04x\n", addr);
81 int cpu_x86_inl(int addr)
83 fprintf(stderr, "inl: port=0x%04x\n", addr);
87 void write_dt(void *ptr, unsigned long addr, unsigned long limit,
90 unsigned int e1, e2, limit_in_pages;
96 e1 = (addr << 16) | (limit & 0xffff);
97 e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
98 e2 |= limit_in_pages << 23; /* byte granularity */
99 e2 |= seg32_bit << 22; /* 32 bit segment */
100 stl((uint8_t *)ptr, e1);
101 stl((uint8_t *)ptr + 4, e2);
104 uint64_t gdt_table[6];
106 void cpu_loop(struct CPUX86State *env)
110 target_siginfo_t info;
113 err = cpu_x86_exec(env);
114 pc = env->seg_cache[R_CS].base + env->eip;
117 if (pc[0] == 0xcd && pc[1] == 0x80) {
120 env->regs[R_EAX] = do_syscall(env,
129 /* XXX: more precise info */
130 info.si_signo = SIGSEGV;
133 info._sifields._sigfault._addr = 0;
134 queue_signal(info.si_signo, &info);
138 /* division by zero */
139 info.si_signo = SIGFPE;
141 info.si_code = TARGET_FPE_INTDIV;
142 info._sifields._sigfault._addr = env->eip;
143 queue_signal(info.si_signo, &info);
147 info.si_signo = SIGSEGV;
150 info._sifields._sigfault._addr = 0;
151 queue_signal(info.si_signo, &info);
154 info.si_signo = SIGILL;
156 info.si_code = TARGET_ILL_ILLOPN;
157 info._sifields._sigfault._addr = env->eip;
158 queue_signal(info.si_signo, &info);
161 /* just indicate that signals should be handled asap */
164 fprintf(stderr, "0x%08lx: Unknown exception CPU %d, aborting\n",
168 process_pending_signals(env);
174 printf("qemu version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
175 "usage: qemu [-d] program [arguments...]\n"
176 "Linux x86 emulator\n"
181 /* XXX: currently only used for async signals (see signal.c) */
182 CPUX86State *global_env;
184 int main(int argc, char **argv)
186 const char *filename;
187 struct target_pt_regs regs1, *regs = ®s1;
188 struct image_info info1, *info = &info1;
196 if (argv[optind] && !strcmp(argv[optind], "-d")) {
200 filename = argv[optind];
204 logfile = fopen(DEBUG_LOGFILE, "w");
206 perror(DEBUG_LOGFILE);
209 setvbuf(logfile, NULL, _IOLBF, 0);
213 memset(regs, 0, sizeof(struct target_pt_regs));
215 /* Zero out image_info */
216 memset(info, 0, sizeof(struct image_info));
218 if(elf_exec(filename, argv+optind, environ, regs, info) != 0) {
219 printf("Error loading %s\n", filename);
224 fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
225 fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
226 fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
227 fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
228 fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
229 fprintf(logfile, "brk 0x%08lx\n" , info->brk);
230 fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
231 fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
234 target_set_brk((char *)info->brk);
238 env = cpu_x86_init();
241 /* linux register setup */
242 env->regs[R_EAX] = regs->eax;
243 env->regs[R_EBX] = regs->ebx;
244 env->regs[R_ECX] = regs->ecx;
245 env->regs[R_EDX] = regs->edx;
246 env->regs[R_ESI] = regs->esi;
247 env->regs[R_EDI] = regs->edi;
248 env->regs[R_EBP] = regs->ebp;
249 env->regs[R_ESP] = regs->esp;
250 env->eip = regs->eip;
252 /* linux segment setup */
253 env->gdt.base = (void *)gdt_table;
254 env->gdt.limit = sizeof(gdt_table) - 1;
255 write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1);
256 write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1);
257 cpu_x86_load_seg(env, R_CS, __USER_CS);
258 cpu_x86_load_seg(env, R_DS, __USER_DS);
259 cpu_x86_load_seg(env, R_ES, __USER_DS);
260 cpu_x86_load_seg(env, R_SS, __USER_DS);
261 cpu_x86_load_seg(env, R_FS, __USER_DS);
262 cpu_x86_load_seg(env, R_GS, __USER_DS);