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);
84 /* XXX: currently we use LDT entries */
85 #define __USER_CS (0x23|4)
86 #define __USER_DS (0x2B|4)
90 printf("gemu version " GEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
91 "usage: gemu [-d] program [arguments...]\n"
92 "Linux x86 emulator\n"
97 int main(int argc, char **argv)
100 struct target_pt_regs regs1, *regs = ®s1;
101 struct image_info info1, *info = &info1;
109 if (argv[optind] && !strcmp(argv[optind], "-d")) {
113 filename = argv[optind];
117 logfile = fopen(DEBUG_LOGFILE, "w");
119 perror(DEBUG_LOGFILE);
122 setvbuf(logfile, NULL, _IOLBF, 0);
126 memset(regs, 0, sizeof(struct target_pt_regs));
128 /* Zero out image_info */
129 memset(info, 0, sizeof(struct image_info));
131 if(elf_exec(filename, argv+optind, environ, regs, info) != 0) {
132 printf("Error loading %s\n", filename);
137 fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
138 fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
139 fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
140 fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
141 fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
142 fprintf(logfile, "brk 0x%08lx\n" , info->brk);
143 fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
144 fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
147 target_set_brk((char *)info->brk);
150 env = cpu_x86_init();
152 env->regs[R_EAX] = regs->eax;
153 env->regs[R_EBX] = regs->ebx;
154 env->regs[R_ECX] = regs->ecx;
155 env->regs[R_EDX] = regs->edx;
156 env->regs[R_ESI] = regs->esi;
157 env->regs[R_EDI] = regs->edi;
158 env->regs[R_EBP] = regs->ebp;
159 env->regs[R_ESP] = regs->esp;
160 env->segs[R_CS] = __USER_CS;
161 env->segs[R_DS] = __USER_DS;
162 env->segs[R_ES] = __USER_DS;
163 env->segs[R_SS] = __USER_DS;
164 env->segs[R_FS] = __USER_DS;
165 env->segs[R_GS] = __USER_DS;
169 LDT[__USER_CS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;
170 LDT[__USER_CS >> 3].dwSelLimit = 0xfffff;
171 LDT[__USER_CS >> 3].lpSelBase = NULL;
173 LDT[__USER_DS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;
174 LDT[__USER_DS >> 3].dwSelLimit = 0xfffff;
175 LDT[__USER_DS >> 3].lpSelBase = NULL;
182 err = cpu_x86_exec(env);
185 pc = (uint8_t *)env->pc;
186 if (pc[0] == 0xcd && pc[1] == 0x80) {
189 env->regs[R_EAX] = do_syscall(env->regs[R_EAX],
202 fprintf(stderr, "0x%08lx: Unknown exception %d, aborting\n",