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/*
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* qemu main
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include "qemu.h" |
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#include "cpu-i386.h" |
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#define DEBUG_LOGFILE "/tmp/qemu.log" |
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FILE *logfile = NULL;
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int loglevel;
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static const char *interp_prefix = CONFIG_QEMU_PREFIX; |
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#ifdef __i386__
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/* Force usage of an ELF interpreter even if it is an ELF shared
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object ! */
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const char interp[] __attribute__((section(".interp"))) = "/lib/ld-linux.so.2"; |
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/* for recent libc, we add these dummies symbol which are not declared
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when generating a linked object (bug in ld ?) */
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#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) |
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long __init_array_start[0]; |
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long __init_array_end[0]; |
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long __fini_array_start[0]; |
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long __fini_array_end[0]; |
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#endif
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#endif
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/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
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we allocate a bigger stack. Need a better solution, for example
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by remapping the process stack directly at the right place */
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unsigned long x86_stack_size = 512 * 1024; |
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void gemu_log(const char *fmt, ...) |
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{ |
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va_list ap; |
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va_start(ap, fmt); |
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vfprintf(stderr, fmt, ap); |
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va_end(ap); |
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} |
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/***********************************************************/
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/* CPUX86 core interface */
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void cpu_x86_outb(CPUX86State *env, int addr, int val) |
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{ |
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fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
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} |
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void cpu_x86_outw(CPUX86State *env, int addr, int val) |
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{ |
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fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
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} |
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void cpu_x86_outl(CPUX86State *env, int addr, int val) |
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{ |
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fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
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} |
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int cpu_x86_inb(CPUX86State *env, int addr) |
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{ |
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fprintf(stderr, "inb: port=0x%04x\n", addr);
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return 0; |
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} |
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int cpu_x86_inw(CPUX86State *env, int addr) |
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{ |
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fprintf(stderr, "inw: port=0x%04x\n", addr);
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return 0; |
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} |
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int cpu_x86_inl(CPUX86State *env, int addr) |
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{ |
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fprintf(stderr, "inl: port=0x%04x\n", addr);
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return 0; |
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} |
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static void write_dt(void *ptr, unsigned long addr, unsigned long limit, |
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int flags)
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{ |
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unsigned int e1, e2; |
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e1 = (addr << 16) | (limit & 0xffff); |
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e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); |
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e2 |= flags; |
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stl((uint8_t *)ptr, e1); |
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stl((uint8_t *)ptr + 4, e2);
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} |
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static void set_gate(void *ptr, unsigned int type, unsigned int dpl, |
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unsigned long addr, unsigned int sel) |
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{ |
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unsigned int e1, e2; |
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e1 = (addr & 0xffff) | (sel << 16); |
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e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8); |
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stl((uint8_t *)ptr, e1); |
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stl((uint8_t *)ptr + 4, e2);
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} |
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uint64_t gdt_table[6];
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uint64_t idt_table[256];
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/* only dpl matters as we do only user space emulation */
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static void set_idt(int n, unsigned int dpl) |
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{ |
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set_gate(idt_table + n, 0, dpl, 0, 0); |
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} |
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void cpu_loop(CPUX86State *env)
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{ |
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int trapnr;
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uint8_t *pc; |
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target_siginfo_t info; |
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for(;;) {
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trapnr = cpu_x86_exec(env); |
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switch(trapnr) {
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case 0x80: |
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/* linux syscall */
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env->regs[R_EAX] = do_syscall(env, |
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env->regs[R_EAX], |
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env->regs[R_EBX], |
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env->regs[R_ECX], |
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env->regs[R_EDX], |
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env->regs[R_ESI], |
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env->regs[R_EDI], |
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env->regs[R_EBP]); |
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break;
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case EXCP0B_NOSEG:
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case EXCP0C_STACK:
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info.si_signo = SIGBUS; |
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info.si_errno = 0;
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info.si_code = TARGET_SI_KERNEL; |
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info._sifields._sigfault._addr = 0;
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queue_signal(info.si_signo, &info); |
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break;
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case EXCP0D_GPF:
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if (env->eflags & VM_MASK) {
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handle_vm86_fault(env); |
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} else {
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info.si_signo = SIGSEGV; |
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info.si_errno = 0;
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info.si_code = TARGET_SI_KERNEL; |
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info._sifields._sigfault._addr = 0;
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queue_signal(info.si_signo, &info); |
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} |
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break;
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case EXCP0E_PAGE:
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info.si_signo = SIGSEGV; |
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info.si_errno = 0;
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if (!(env->error_code & 1)) |
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info.si_code = TARGET_SEGV_MAPERR; |
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else
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info.si_code = TARGET_SEGV_ACCERR; |
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info._sifields._sigfault._addr = env->cr2; |
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queue_signal(info.si_signo, &info); |
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break;
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case EXCP00_DIVZ:
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if (env->eflags & VM_MASK) {
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handle_vm86_trap(env, trapnr); |
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} else {
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/* division by zero */
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info.si_signo = SIGFPE; |
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info.si_errno = 0;
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info.si_code = TARGET_FPE_INTDIV; |
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info._sifields._sigfault._addr = env->eip; |
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queue_signal(info.si_signo, &info); |
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} |
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break;
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case EXCP01_SSTP:
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case EXCP03_INT3:
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if (env->eflags & VM_MASK) {
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handle_vm86_trap(env, trapnr); |
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} else {
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info.si_signo = SIGTRAP; |
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info.si_errno = 0;
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if (trapnr == EXCP01_SSTP) {
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info.si_code = TARGET_TRAP_BRKPT; |
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info._sifields._sigfault._addr = env->eip; |
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} else {
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info.si_code = TARGET_SI_KERNEL; |
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info._sifields._sigfault._addr = 0;
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} |
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queue_signal(info.si_signo, &info); |
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} |
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break;
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case EXCP04_INTO:
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case EXCP05_BOUND:
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if (env->eflags & VM_MASK) {
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handle_vm86_trap(env, trapnr); |
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} else {
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info.si_signo = SIGSEGV; |
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info.si_errno = 0;
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info.si_code = TARGET_SI_KERNEL; |
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info._sifields._sigfault._addr = 0;
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queue_signal(info.si_signo, &info); |
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} |
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break;
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case EXCP06_ILLOP:
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info.si_signo = SIGILL; |
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info.si_errno = 0;
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info.si_code = TARGET_ILL_ILLOPN; |
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info._sifields._sigfault._addr = env->eip; |
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queue_signal(info.si_signo, &info); |
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break;
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case EXCP_INTERRUPT:
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/* just indicate that signals should be handled asap */
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break;
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default:
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pc = env->seg_cache[R_CS].base + env->eip; |
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fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
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(long)pc, trapnr);
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abort(); |
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} |
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process_pending_signals(env); |
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} |
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} |
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void usage(void) |
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{ |
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printf("qemu version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
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"usage: qemu [-h] [-d] [-L path] [-s size] program [arguments...]\n"
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"Linux x86 emulator\n"
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"\n"
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"-h print this help\n"
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"-L path set the x86 elf interpreter prefix (default=%s)\n"
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"-s size set the x86 stack size in bytes (default=%ld)\n"
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"\n"
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"debug options:\n"
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"-d activate log (logfile=%s)\n"
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"-p pagesize set the host page size to 'pagesize'\n",
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interp_prefix, |
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x86_stack_size, |
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DEBUG_LOGFILE); |
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_exit(1);
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} |
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/* XXX: currently only used for async signals (see signal.c) */
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CPUX86State *global_env; |
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/* used to free thread contexts */
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TaskState *first_task_state; |
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int main(int argc, char **argv) |
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{ |
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const char *filename; |
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struct target_pt_regs regs1, *regs = ®s1;
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struct image_info info1, *info = &info1;
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TaskState ts1, *ts = &ts1; |
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CPUX86State *env; |
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int optind;
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const char *r; |
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if (argc <= 1) |
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usage(); |
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loglevel = 0;
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optind = 1;
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for(;;) {
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if (optind >= argc)
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break;
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r = argv[optind]; |
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if (r[0] != '-') |
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break;
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optind++; |
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r++; |
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if (!strcmp(r, "-")) { |
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break;
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} else if (!strcmp(r, "d")) { |
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loglevel = 1;
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} else if (!strcmp(r, "s")) { |
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r = argv[optind++]; |
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x86_stack_size = strtol(r, (char **)&r, 0); |
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if (x86_stack_size <= 0) |
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usage(); |
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if (*r == 'M') |
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x86_stack_size *= 1024 * 1024; |
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else if (*r == 'k' || *r == 'K') |
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x86_stack_size *= 1024;
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} else if (!strcmp(r, "L")) { |
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interp_prefix = argv[optind++]; |
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} else if (!strcmp(r, "p")) { |
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host_page_size = atoi(argv[optind++]); |
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if (host_page_size == 0 || |
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(host_page_size & (host_page_size - 1)) != 0) { |
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fprintf(stderr, "page size must be a power of two\n");
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exit(1);
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} |
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} else {
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usage(); |
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} |
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} |
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if (optind >= argc)
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usage(); |
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filename = argv[optind]; |
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/* init debug */
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if (loglevel) {
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logfile = fopen(DEBUG_LOGFILE, "w");
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if (!logfile) {
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perror(DEBUG_LOGFILE); |
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_exit(1);
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} |
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setvbuf(logfile, NULL, _IOLBF, 0); |
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} |
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/* Zero out regs */
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memset(regs, 0, sizeof(struct target_pt_regs)); |
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/* Zero out image_info */
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memset(info, 0, sizeof(struct image_info)); |
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/* Scan interp_prefix dir for replacement files. */
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init_paths(interp_prefix); |
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/* NOTE: we need to init the CPU at this stage to get the
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host_page_size */
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env = cpu_x86_init(); |
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if (elf_exec(filename, argv+optind, environ, regs, info) != 0) { |
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printf("Error loading %s\n", filename);
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_exit(1);
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} |
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if (loglevel) {
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page_dump(logfile); |
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fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
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fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
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fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
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fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
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fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
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fprintf(logfile, "brk 0x%08lx\n" , info->brk);
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fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
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fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
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} |
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target_set_brk((char *)info->brk);
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syscall_init(); |
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signal_init(); |
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global_env = env; |
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/* build Task State */
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memset(ts, 0, sizeof(TaskState)); |
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env->opaque = ts; |
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ts->used = 1;
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/* linux register setup */
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env->regs[R_EAX] = regs->eax; |
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env->regs[R_EBX] = regs->ebx; |
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env->regs[R_ECX] = regs->ecx; |
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env->regs[R_EDX] = regs->edx; |
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env->regs[R_ESI] = regs->esi; |
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env->regs[R_EDI] = regs->edi; |
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env->regs[R_EBP] = regs->ebp; |
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env->regs[R_ESP] = regs->esp; |
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env->eip = regs->eip; |
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/* linux interrupt setup */
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env->idt.base = (void *)idt_table;
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env->idt.limit = sizeof(idt_table) - 1; |
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set_idt(0, 0); |
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set_idt(1, 0); |
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set_idt(2, 0); |
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set_idt(3, 3); |
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set_idt(4, 3); |
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set_idt(5, 3); |
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set_idt(6, 0); |
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set_idt(7, 0); |
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set_idt(8, 0); |
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set_idt(9, 0); |
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set_idt(10, 0); |
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set_idt(11, 0); |
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set_idt(12, 0); |
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set_idt(13, 0); |
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set_idt(14, 0); |
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set_idt(15, 0); |
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set_idt(16, 0); |
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set_idt(17, 0); |
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set_idt(18, 0); |
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set_idt(19, 0); |
406 |
set_idt(0x80, 3); |
407 |
|
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/* linux segment setup */
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env->gdt.base = (void *)gdt_table;
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env->gdt.limit = sizeof(gdt_table) - 1; |
411 |
write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff, |
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DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | |
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(3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT)); |
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write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff, |
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DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | |
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(3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT)); |
417 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
418 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
419 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
420 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
421 |
cpu_x86_load_seg(env, R_FS, __USER_DS); |
422 |
cpu_x86_load_seg(env, R_GS, __USER_DS); |
423 |
|
424 |
cpu_loop(env); |
425 |
/* never exits */
|
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return 0; |
427 |
} |