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.
30 #define DEBUG_LOGFILE "/tmp/gemu.log"
35 unsigned long x86_stack_size;
38 void gemu_log(const char *fmt, ...)
43 vfprintf(stderr, fmt, ap);
47 /***********************************************************/
48 /* CPUX86 core interface */
50 void cpu_x86_outb(int addr, int val)
52 fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
55 void cpu_x86_outw(int addr, int val)
57 fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
60 void cpu_x86_outl(int addr, int val)
62 fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
65 int cpu_x86_inb(int addr)
67 fprintf(stderr, "inb: port=0x%04x\n", addr);
71 int cpu_x86_inw(int addr)
73 fprintf(stderr, "inw: port=0x%04x\n", addr);
77 int cpu_x86_inl(int addr)
79 fprintf(stderr, "inl: port=0x%04x\n", addr);
83 /* default linux values for the selectors */
84 #define __USER_CS (0x23)
85 #define __USER_DS (0x2B)
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];
108 printf("gemu version " GEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
109 "usage: gemu [-d] program [arguments...]\n"
110 "Linux x86 emulator\n"
117 int main(int argc, char **argv)
119 const char *filename;
120 struct target_pt_regs regs1, *regs = ®s1;
121 struct image_info info1, *info = &info1;
129 if (argv[optind] && !strcmp(argv[optind], "-d")) {
133 filename = argv[optind];
137 logfile = fopen(DEBUG_LOGFILE, "w");
139 perror(DEBUG_LOGFILE);
142 setvbuf(logfile, NULL, _IOLBF, 0);
146 memset(regs, 0, sizeof(struct target_pt_regs));
148 /* Zero out image_info */
149 memset(info, 0, sizeof(struct image_info));
151 if(elf_exec(filename, argv+optind, environ, regs, info) != 0) {
152 printf("Error loading %s\n", filename);
157 fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
158 fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
159 fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
160 fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
161 fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
162 fprintf(logfile, "brk 0x%08lx\n" , info->brk);
163 fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
164 fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
167 target_set_brk((char *)info->brk);
170 env = cpu_x86_init();
172 /* linux register setup */
173 env->regs[R_EAX] = regs->eax;
174 env->regs[R_EBX] = regs->ebx;
175 env->regs[R_ECX] = regs->ecx;
176 env->regs[R_EDX] = regs->edx;
177 env->regs[R_ESI] = regs->esi;
178 env->regs[R_EDI] = regs->edi;
179 env->regs[R_EBP] = regs->ebp;
180 env->regs[R_ESP] = regs->esp;
183 /* linux segment setup */
184 env->gdt.base = (void *)gdt_table;
185 env->gdt.limit = sizeof(gdt_table) - 1;
186 write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1);
187 write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1);
188 cpu_x86_load_seg(env, R_CS, __USER_CS);
189 cpu_x86_load_seg(env, R_DS, __USER_DS);
190 cpu_x86_load_seg(env, R_ES, __USER_DS);
191 cpu_x86_load_seg(env, R_SS, __USER_DS);
192 cpu_x86_load_seg(env, R_FS, __USER_DS);
193 cpu_x86_load_seg(env, R_GS, __USER_DS);
199 err = cpu_x86_exec(env);
202 pc = (uint8_t *)env->pc;
203 if (pc[0] == 0xcd && pc[1] == 0x80) {
206 env->regs[R_EAX] = do_syscall(env,
220 fprintf(stderr, "0x%08lx: Unknown exception %d, aborting\n",