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/gemu.log"
36 unsigned long x86_stack_size;
39 void gemu_log(const char *fmt, ...)
44 vfprintf(stderr, fmt, ap);
48 /***********************************************************/
49 /* CPUX86 core interface */
51 void cpu_x86_outb(int addr, int val)
53 fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
56 void cpu_x86_outw(int addr, int val)
58 fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
61 void cpu_x86_outl(int addr, int val)
63 fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
66 int cpu_x86_inb(int addr)
68 fprintf(stderr, "inb: port=0x%04x\n", addr);
72 int cpu_x86_inw(int addr)
74 fprintf(stderr, "inw: port=0x%04x\n", addr);
78 int cpu_x86_inl(int addr)
80 fprintf(stderr, "inl: port=0x%04x\n", addr);
84 void write_dt(void *ptr, unsigned long addr, unsigned long limit,
87 unsigned int e1, e2, limit_in_pages;
93 e1 = (addr << 16) | (limit & 0xffff);
94 e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
95 e2 |= limit_in_pages << 23; /* byte granularity */
96 e2 |= seg32_bit << 22; /* 32 bit segment */
97 stl((uint8_t *)ptr, e1);
98 stl((uint8_t *)ptr + 4, e2);
101 uint64_t gdt_table[6];
103 void cpu_loop(struct CPUX86State *env)
109 err = cpu_x86_exec(env);
110 pc = env->seg_cache[R_CS].base + env->eip;
113 if (pc[0] == 0xcd && pc[1] == 0x80) {
116 env->regs[R_EAX] = do_syscall(env,
130 fprintf(stderr, "0x%08lx: Unknown exception %d, aborting\n",
134 process_pending_signals(env);
140 printf("gemu version " GEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
141 "usage: gemu [-d] program [arguments...]\n"
142 "Linux x86 emulator\n"
147 int main(int argc, char **argv)
149 const char *filename;
150 struct target_pt_regs regs1, *regs = ®s1;
151 struct image_info info1, *info = &info1;
159 if (argv[optind] && !strcmp(argv[optind], "-d")) {
163 filename = argv[optind];
167 logfile = fopen(DEBUG_LOGFILE, "w");
169 perror(DEBUG_LOGFILE);
172 setvbuf(logfile, NULL, _IOLBF, 0);
176 memset(regs, 0, sizeof(struct target_pt_regs));
178 /* Zero out image_info */
179 memset(info, 0, sizeof(struct image_info));
181 if(elf_exec(filename, argv+optind, environ, regs, info) != 0) {
182 printf("Error loading %s\n", filename);
187 fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
188 fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
189 fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
190 fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
191 fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
192 fprintf(logfile, "brk 0x%08lx\n" , info->brk);
193 fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
194 fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
197 target_set_brk((char *)info->brk);
201 env = cpu_x86_init();
203 /* linux register setup */
204 env->regs[R_EAX] = regs->eax;
205 env->regs[R_EBX] = regs->ebx;
206 env->regs[R_ECX] = regs->ecx;
207 env->regs[R_EDX] = regs->edx;
208 env->regs[R_ESI] = regs->esi;
209 env->regs[R_EDI] = regs->edi;
210 env->regs[R_EBP] = regs->ebp;
211 env->regs[R_ESP] = regs->esp;
212 env->eip = regs->eip;
214 /* linux segment setup */
215 env->gdt.base = (void *)gdt_table;
216 env->gdt.limit = sizeof(gdt_table) - 1;
217 write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1);
218 write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1);
219 cpu_x86_load_seg(env, R_CS, __USER_CS);
220 cpu_x86_load_seg(env, R_DS, __USER_DS);
221 cpu_x86_load_seg(env, R_ES, __USER_DS);
222 cpu_x86_load_seg(env, R_SS, __USER_DS);
223 cpu_x86_load_seg(env, R_FS, __USER_DS);
224 cpu_x86_load_seg(env, R_GS, __USER_DS);