131e31b8aSbellard /* 26dbad63eSbellard * gemu main 331e31b8aSbellard * 431e31b8aSbellard * Copyright (c) 2003 Fabrice Bellard 531e31b8aSbellard * 631e31b8aSbellard * This program is free software; you can redistribute it and/or modify 731e31b8aSbellard * it under the terms of the GNU General Public License as published by 831e31b8aSbellard * the Free Software Foundation; either version 2 of the License, or 931e31b8aSbellard * (at your option) any later version. 1031e31b8aSbellard * 1131e31b8aSbellard * This program is distributed in the hope that it will be useful, 1231e31b8aSbellard * but WITHOUT ANY WARRANTY; without even the implied warranty of 1331e31b8aSbellard * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1431e31b8aSbellard * GNU General Public License for more details. 1531e31b8aSbellard * 1631e31b8aSbellard * You should have received a copy of the GNU General Public License 1731e31b8aSbellard * along with this program; if not, write to the Free Software 1831e31b8aSbellard * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 1931e31b8aSbellard */ 2031e31b8aSbellard #include <stdlib.h> 2131e31b8aSbellard #include <stdio.h> 2231e31b8aSbellard #include <stdarg.h> 2304369ff2Sbellard #include <string.h> 2431e31b8aSbellard #include <errno.h> 250ecfa993Sbellard #include <unistd.h> 2631e31b8aSbellard 2731e31b8aSbellard #include "gemu.h" 2831e31b8aSbellard 290ecfa993Sbellard #include "cpu-i386.h" 3031e31b8aSbellard 31586314f2Sbellard #define DEBUG_LOGFILE "/tmp/gemu.log" 32586314f2Sbellard 33586314f2Sbellard FILE *logfile = NULL; 34586314f2Sbellard int loglevel; 35586314f2Sbellard 3631e31b8aSbellard unsigned long x86_stack_size; 3731e31b8aSbellard unsigned long stktop; 3831e31b8aSbellard 3931e31b8aSbellard void gemu_log(const char *fmt, ...) 4031e31b8aSbellard { 4131e31b8aSbellard va_list ap; 4231e31b8aSbellard 4331e31b8aSbellard va_start(ap, fmt); 4431e31b8aSbellard vfprintf(stderr, fmt, ap); 4531e31b8aSbellard va_end(ap); 4631e31b8aSbellard } 4731e31b8aSbellard 4831e31b8aSbellard /***********************************************************/ 490ecfa993Sbellard /* CPUX86 core interface */ 50367e86e8Sbellard 51ba1c6e37Sbellard void cpu_x86_outb(int addr, int val) 52367e86e8Sbellard { 53367e86e8Sbellard fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val); 54367e86e8Sbellard } 55367e86e8Sbellard 56ba1c6e37Sbellard void cpu_x86_outw(int addr, int val) 57367e86e8Sbellard { 58367e86e8Sbellard fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val); 59367e86e8Sbellard } 60367e86e8Sbellard 61ba1c6e37Sbellard void cpu_x86_outl(int addr, int val) 62367e86e8Sbellard { 63367e86e8Sbellard fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val); 64367e86e8Sbellard } 65367e86e8Sbellard 66ba1c6e37Sbellard int cpu_x86_inb(int addr) 67367e86e8Sbellard { 68367e86e8Sbellard fprintf(stderr, "inb: port=0x%04x\n", addr); 69367e86e8Sbellard return 0; 70367e86e8Sbellard } 71367e86e8Sbellard 72ba1c6e37Sbellard int cpu_x86_inw(int addr) 73367e86e8Sbellard { 74367e86e8Sbellard fprintf(stderr, "inw: port=0x%04x\n", addr); 75367e86e8Sbellard return 0; 76367e86e8Sbellard } 77367e86e8Sbellard 78ba1c6e37Sbellard int cpu_x86_inl(int addr) 79367e86e8Sbellard { 80367e86e8Sbellard fprintf(stderr, "inl: port=0x%04x\n", addr); 81367e86e8Sbellard return 0; 82367e86e8Sbellard } 83367e86e8Sbellard 846dbad63eSbellard void write_dt(void *ptr, unsigned long addr, unsigned long limit, 856dbad63eSbellard int seg32_bit) 866dbad63eSbellard { 876dbad63eSbellard unsigned int e1, e2, limit_in_pages; 886dbad63eSbellard limit_in_pages = 0; 896dbad63eSbellard if (limit > 0xffff) { 906dbad63eSbellard limit = limit >> 12; 916dbad63eSbellard limit_in_pages = 1; 926dbad63eSbellard } 936dbad63eSbellard e1 = (addr << 16) | (limit & 0xffff); 946dbad63eSbellard e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); 956dbad63eSbellard e2 |= limit_in_pages << 23; /* byte granularity */ 966dbad63eSbellard e2 |= seg32_bit << 22; /* 32 bit segment */ 976dbad63eSbellard stl((uint8_t *)ptr, e1); 986dbad63eSbellard stl((uint8_t *)ptr + 4, e2); 996dbad63eSbellard } 1006dbad63eSbellard 1016dbad63eSbellard uint64_t gdt_table[6]; 10231e31b8aSbellard 1031b6b029eSbellard void cpu_loop(struct CPUX86State *env) 1041b6b029eSbellard { 1051b6b029eSbellard for(;;) { 1061b6b029eSbellard int err; 1071b6b029eSbellard uint8_t *pc; 1081b6b029eSbellard 1091b6b029eSbellard err = cpu_x86_exec(env); 1101b6b029eSbellard pc = env->seg_cache[R_CS].base + env->eip; 1111b6b029eSbellard switch(err) { 1121b6b029eSbellard case EXCP0D_GPF: 1131b6b029eSbellard if (pc[0] == 0xcd && pc[1] == 0x80) { 1141b6b029eSbellard /* syscall */ 1151b6b029eSbellard env->eip += 2; 1161b6b029eSbellard env->regs[R_EAX] = do_syscall(env, 1171b6b029eSbellard env->regs[R_EAX], 1181b6b029eSbellard env->regs[R_EBX], 1191b6b029eSbellard env->regs[R_ECX], 1201b6b029eSbellard env->regs[R_EDX], 1211b6b029eSbellard env->regs[R_ESI], 1221b6b029eSbellard env->regs[R_EDI], 1231b6b029eSbellard env->regs[R_EBP]); 1241b6b029eSbellard } else { 1251b6b029eSbellard goto trap_error; 1261b6b029eSbellard } 1271b6b029eSbellard break; 1281b6b029eSbellard default: 1291b6b029eSbellard trap_error: 1301b6b029eSbellard fprintf(stderr, "0x%08lx: Unknown exception %d, aborting\n", 1311b6b029eSbellard (long)pc, err); 1321b6b029eSbellard abort(); 1331b6b029eSbellard } 134*66fb9763Sbellard process_pending_signals(env); 1351b6b029eSbellard } 1361b6b029eSbellard } 1371b6b029eSbellard 13831e31b8aSbellard void usage(void) 13931e31b8aSbellard { 1407d13299dSbellard printf("gemu version " GEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" 141586314f2Sbellard "usage: gemu [-d] program [arguments...]\n" 14231e31b8aSbellard "Linux x86 emulator\n" 14331e31b8aSbellard ); 14431e31b8aSbellard exit(1); 14531e31b8aSbellard } 14631e31b8aSbellard 14731e31b8aSbellard int main(int argc, char **argv) 14831e31b8aSbellard { 14931e31b8aSbellard const char *filename; 15001ffc75bSbellard struct target_pt_regs regs1, *regs = ®s1; 15131e31b8aSbellard struct image_info info1, *info = &info1; 1520ecfa993Sbellard CPUX86State *env; 153586314f2Sbellard int optind; 15431e31b8aSbellard 15531e31b8aSbellard if (argc <= 1) 15631e31b8aSbellard usage(); 157586314f2Sbellard loglevel = 0; 158586314f2Sbellard optind = 1; 159586314f2Sbellard if (argv[optind] && !strcmp(argv[optind], "-d")) { 160586314f2Sbellard loglevel = 1; 161586314f2Sbellard optind++; 162586314f2Sbellard } 163586314f2Sbellard filename = argv[optind]; 16431e31b8aSbellard 165586314f2Sbellard /* init debug */ 166586314f2Sbellard if (loglevel) { 167586314f2Sbellard logfile = fopen(DEBUG_LOGFILE, "w"); 168586314f2Sbellard if (!logfile) { 169586314f2Sbellard perror(DEBUG_LOGFILE); 170586314f2Sbellard exit(1); 171586314f2Sbellard } 172586314f2Sbellard setvbuf(logfile, NULL, _IOLBF, 0); 173586314f2Sbellard } 17431e31b8aSbellard 17531e31b8aSbellard /* Zero out regs */ 17601ffc75bSbellard memset(regs, 0, sizeof(struct target_pt_regs)); 17731e31b8aSbellard 17831e31b8aSbellard /* Zero out image_info */ 17931e31b8aSbellard memset(info, 0, sizeof(struct image_info)); 18031e31b8aSbellard 1814b74fe1fSbellard if(elf_exec(filename, argv+optind, environ, regs, info) != 0) { 18231e31b8aSbellard printf("Error loading %s\n", filename); 18331e31b8aSbellard exit(1); 18431e31b8aSbellard } 18531e31b8aSbellard 1864b74fe1fSbellard if (loglevel) { 1874b74fe1fSbellard fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk); 1884b74fe1fSbellard fprintf(logfile, "end_code 0x%08lx\n" , info->end_code); 1894b74fe1fSbellard fprintf(logfile, "start_code 0x%08lx\n" , info->start_code); 1904b74fe1fSbellard fprintf(logfile, "end_data 0x%08lx\n" , info->end_data); 1914b74fe1fSbellard fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack); 1924b74fe1fSbellard fprintf(logfile, "brk 0x%08lx\n" , info->brk); 1934b74fe1fSbellard fprintf(logfile, "esp 0x%08lx\n" , regs->esp); 1944b74fe1fSbellard fprintf(logfile, "eip 0x%08lx\n" , regs->eip); 1954b74fe1fSbellard } 19631e31b8aSbellard 19731e31b8aSbellard target_set_brk((char *)info->brk); 19831e31b8aSbellard syscall_init(); 199*66fb9763Sbellard signal_init(); 20031e31b8aSbellard 2010ecfa993Sbellard env = cpu_x86_init(); 20231e31b8aSbellard 2036dbad63eSbellard /* linux register setup */ 2040ecfa993Sbellard env->regs[R_EAX] = regs->eax; 2050ecfa993Sbellard env->regs[R_EBX] = regs->ebx; 2060ecfa993Sbellard env->regs[R_ECX] = regs->ecx; 2070ecfa993Sbellard env->regs[R_EDX] = regs->edx; 2080ecfa993Sbellard env->regs[R_ESI] = regs->esi; 2090ecfa993Sbellard env->regs[R_EDI] = regs->edi; 2100ecfa993Sbellard env->regs[R_EBP] = regs->ebp; 2110ecfa993Sbellard env->regs[R_ESP] = regs->esp; 212dab2ed99Sbellard env->eip = regs->eip; 21331e31b8aSbellard 2146dbad63eSbellard /* linux segment setup */ 2156dbad63eSbellard env->gdt.base = (void *)gdt_table; 2166dbad63eSbellard env->gdt.limit = sizeof(gdt_table) - 1; 2176dbad63eSbellard write_dt(&gdt_table[__USER_CS >> 3], 0, 0xffffffff, 1); 2186dbad63eSbellard write_dt(&gdt_table[__USER_DS >> 3], 0, 0xffffffff, 1); 2196dbad63eSbellard cpu_x86_load_seg(env, R_CS, __USER_CS); 2206dbad63eSbellard cpu_x86_load_seg(env, R_DS, __USER_DS); 2216dbad63eSbellard cpu_x86_load_seg(env, R_ES, __USER_DS); 2226dbad63eSbellard cpu_x86_load_seg(env, R_SS, __USER_DS); 2236dbad63eSbellard cpu_x86_load_seg(env, R_FS, __USER_DS); 2246dbad63eSbellard cpu_x86_load_seg(env, R_GS, __USER_DS); 22531e31b8aSbellard 2261b6b029eSbellard cpu_loop(env); 2271b6b029eSbellard /* never exits */ 22831e31b8aSbellard return 0; 22931e31b8aSbellard } 230