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qemu
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qemu/linux-user/main.c

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/*
* emu main
*
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include "gemu.h"
#include "i386/hsw_interp.h"
unsigned long x86_stack_size;
unsigned long stktop;
void gemu_log(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
/* virtual x86 CPU stuff */
extern int invoke_code16(Interp_ENV *, int, int);
extern int invoke_code32(Interp_ENV *, int);
extern char *e_print_cpuemu_regs(ENVPARAMS, int is32);
extern char *e_emu_disasm(ENVPARAMS, unsigned char *org, int is32);
extern void init_npu(void);
Interp_ENV env_global;
Interp_ENV *envp_global;
QWORD EMUtime = 0;
int CEmuStat = 0;
long instr_count;
/* who will initialize this? */
unsigned long io_bitmap[IO_BITMAP_SIZE+1];
/* debug flag, 0=disable 1..9=level */
int d_emu = 0;
unsigned long CRs[5] =
{
0x00000013, /* valid bits: 0xe005003f */
0x00000000, /* invalid */
0x00000000,
0x00000000,
0x00000000
};
/*
* DR0-3 = linear address of breakpoint 0-3
* DR4=5 = reserved
* DR6 b0-b3 = BP active
* b13 = BD
* b14 = BS
* b15 = BT
* DR7 b0-b1 = G:L bp#0
* b2-b3 = G:L bp#1
* b4-b5 = G:L bp#2
* b6-b7 = G:L bp#3
* b8-b9 = GE:LE
* b13 = GD
* b16-19= LLRW bp#0 LL=00(1),01(2),11(4)
* b20-23= LLRW bp#1 RW=00(x),01(w),11(rw)
* b24-27= LLRW bp#2
* b28-31= LLRW bp#3
*/
unsigned long DRs[8] =
{
0x00000000,
0x00000000,
0x00000000,
0x00000000,
0xffff1ff0,
0x00000400,
0xffff1ff0,
0x00000400
};
unsigned long TRs[2] =
{
0x00000000,
0x00000000
};
void FatalAppExit(UINT wAction, LPCSTR lpText)
{
fprintf(stderr, "Fatal error '%s' in CPU\n", lpText);
exit(1);
}
int e_debug_check(unsigned char *PC)
{
register unsigned long d7 = DRs[7];
if (d7&0x03) {
if (d7&0x30000) return 0; /* only execute(00) bkp */
if ((long)PC==DRs[0]) {
e_printf("DBRK: DR0 hit at %p\n",PC);
DRs[6] |= 1;
return 1;
}
}
if (d7&0x0c) {
if (d7&0x300000) return 0;
if ((long)PC==DRs[1]) {
e_printf("DBRK: DR1 hit at %p\n",PC);
DRs[6] |= 2;
return 1;
}
}
if (d7&0x30) {
if (d7&0x3000000) return 0;
if ((long)PC==DRs[2]) {
e_printf("DBRK: DR2 hit at %p\n",PC);
DRs[6] |= 4;
return 1;
}
}
if (d7&0xc0) {
if (d7&0x30000000) return 0;
if ((long)PC==DRs[3]) {
e_printf("DBRK: DR3 hit at %p\n",PC);
DRs[6] |= 8;
return 1;
}
}
return 0;
}
/* Debug stuff */
void logstr(unsigned long mask, const char *fmt,...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
/* unconditional message into debug log and stderr */
#undef error
void error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
exit(1);
}
int PortIO(DWORD port, DWORD value, UINT size, BOOL is_write)
{
fprintf(stderr, "IO: %s port=0x%lx value=0x%lx size=%d",
is_write ? "write" : "read", port, value, size);
return value;
}
void LogProcName(WORD wSel, WORD wOff, WORD wAction)
{
}
void INT_handler(int num, void *env)
{
fprintf(stderr, "EM86: int %d\n", num);
}
/***********************************************************/
/* new CPU core */
void cpu_x86_outb(int addr, int val)
{
fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
}
void cpu_x86_outw(int addr, int val)
{
fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
}
void cpu_x86_outl(int addr, int val)
{
fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}
int cpu_x86_inb(int addr)
{
fprintf(stderr, "inb: port=0x%04x\n", addr);
return 0;
}
int cpu_x86_inw(int addr)
{
fprintf(stderr, "inw: port=0x%04x\n", addr);
return 0;
}
int cpu_x86_inl(int addr)
{
fprintf(stderr, "inl: port=0x%04x\n", addr);
return 0;
}
/* XXX: currently we use LDT entries */
#define __USER_CS (0x23|4)
#define __USER_DS (0x2B|4)
void usage(void)
{
printf("gemu version 0.1, Copyright (c) 2003 Fabrice Bellard\n"
"usage: gemu program [arguments...]\n"
"Linux x86 emulator\n"
);
exit(1);
}
int main(int argc, char **argv)
{
const char *filename;
struct target_pt_regs regs1, *regs = &regs1;
struct image_info info1, *info = &info1;
Interp_ENV *env;
if (argc <= 1)
usage();
filename = argv[1];
/* Zero out regs */
memset(regs, 0, sizeof(struct target_pt_regs));
/* Zero out image_info */
memset(info, 0, sizeof(struct image_info));
if(elf_exec(filename, argv+1, environ, regs, info) != 0) {
printf("Error loading %s\n", filename);
exit(1);
}
#if 0
printf("start_brk 0x%08lx\n" , info->start_brk);
printf("end_code 0x%08lx\n" , info->end_code);
printf("start_code 0x%08lx\n" , info->start_code);
printf("end_data 0x%08lx\n" , info->end_data);
printf("start_stack 0x%08lx\n" , info->start_stack);
printf("brk 0x%08lx\n" , info->brk);
printf("esp 0x%08lx\n" , regs->esp);
printf("eip 0x%08lx\n" , regs->eip);
#endif
target_set_brk((char *)info->brk);
syscall_init();
env = &env_global;
envp_global = env;
memset(env, 0, sizeof(Interp_ENV));
env->rax.e = regs->eax;
env->rbx.e = regs->ebx;
env->rcx.e = regs->ecx;
env->rdx.e = regs->edx;
env->rsi.esi = regs->esi;
env->rdi.edi = regs->edi;
env->rbp.ebp = regs->ebp;
env->rsp.esp = regs->esp;
env->cs.cs = __USER_CS;
env->ds.ds = __USER_DS;
env->es.es = __USER_DS;
env->ss.ss = __USER_DS;
env->fs.fs = __USER_DS;
env->gs.gs = __USER_DS;
env->trans_addr = regs->eip;
LDT[__USER_CS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;
LDT[__USER_CS >> 3].dwSelLimit = 0xfffff;
LDT[__USER_CS >> 3].lpSelBase = NULL;
LDT[__USER_DS >> 3].w86Flags = DF_PRESENT | DF_PAGES | DF_32;
LDT[__USER_DS >> 3].dwSelLimit = 0xfffff;
LDT[__USER_DS >> 3].lpSelBase = NULL;
init_npu();
build_decode_tables();
for(;;) {
int err;
uint8_t *pc;
err = invoke_code32(env, -1);
env->trans_addr = env->return_addr;
pc = env->seg_regs[0] + env->trans_addr;
switch(err) {
case EXCP0D_GPF:
if (pc[0] == 0xcd && pc[1] == 0x80) {
/* syscall */
env->trans_addr += 2;
env->rax.e = do_syscall(env->rax.e,
env->rbx.e,
env->rcx.e,
env->rdx.e,
env->rsi.esi,
env->rdi.edi,
env->rbp.ebp);
} else {
goto trap_error;
}
break;
default:
trap_error:
fprintf(stderr, "GEMU: Unknown error %d, aborting\n", err);
#ifndef NO_TRACE_MSGS
d_emu = 9;
fprintf(stderr, "%s\n%s\n",
e_print_cpuemu_regs(env, 1),
e_emu_disasm(env,pc,1));
#endif
abort();
}
}
return 0;
}
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