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qemu/linux-user/main.c

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/*
* qemu 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 <string.h>
#include <errno.h>
#include <unistd.h>
#include "qemu.h"
#define DEBUG_LOGFILE "/tmp/qemu.log"
FILE *logfile = NULL;
int loglevel;
static const char *interp_prefix = CONFIG_QEMU_PREFIX;
#ifdef __i386__
/* Force usage of an ELF interpreter even if it is an ELF shared
object ! */
const char interp[] __attribute__((section(".interp"))) = "/lib/ld-linux.so.2";
#endif
/* for recent libc, we add these dummies symbol which are not declared
when generating a linked object (bug in ld ?) */
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
long __init_array_start[0];
long __init_array_end[0];
long __fini_array_start[0];
long __fini_array_end[0];
#endif
/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
we allocate a bigger stack. Need a better solution, for example
by remapping the process stack directly at the right place */
unsigned long x86_stack_size = 512 * 1024;
void gemu_log(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
#ifdef TARGET_I386
/***********************************************************/
/* CPUX86 core interface */
void cpu_x86_outb(CPUX86State *env, int addr, int val)
{
fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
}
void cpu_x86_outw(CPUX86State *env, int addr, int val)
{
fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
}
void cpu_x86_outl(CPUX86State *env, int addr, int val)
{
fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}
int cpu_x86_inb(CPUX86State *env, int addr)
{
fprintf(stderr, "inb: port=0x%04x\n", addr);
return 0;
}
int cpu_x86_inw(CPUX86State *env, int addr)
{
fprintf(stderr, "inw: port=0x%04x\n", addr);
return 0;
}
int cpu_x86_inl(CPUX86State *env, int addr)
{
fprintf(stderr, "inl: port=0x%04x\n", addr);
return 0;
}
int cpu_x86_get_pic_interrupt(CPUX86State *env)
{
return -1;
}
static void write_dt(void *ptr, unsigned long addr, unsigned long limit,
int flags)
{
unsigned int e1, e2;
e1 = (addr << 16) | (limit & 0xffff);
e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000);
e2 |= flags;
stl((uint8_t *)ptr, e1);
stl((uint8_t *)ptr + 4, e2);
}
static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
unsigned long addr, unsigned int sel)
{
unsigned int e1, e2;
e1 = (addr & 0xffff) | (sel << 16);
e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
stl((uint8_t *)ptr, e1);
stl((uint8_t *)ptr + 4, e2);
}
uint64_t gdt_table[6];
uint64_t idt_table[256];
/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
set_gate(idt_table + n, 0, dpl, 0, 0);
}
void cpu_loop(CPUX86State *env)
{
int trapnr;
uint8_t *pc;
target_siginfo_t info;
for(;;) {
trapnr = cpu_x86_exec(env);
switch(trapnr) {
case 0x80:
/* linux syscall */
env->regs[R_EAX] = do_syscall(env,
env->regs[R_EAX],
env->regs[R_EBX],
env->regs[R_ECX],
env->regs[R_EDX],
env->regs[R_ESI],
env->regs[R_EDI],
env->regs[R_EBP]);
break;
case EXCP0B_NOSEG:
case EXCP0C_STACK:
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = TARGET_SI_KERNEL;
info._sifields._sigfault._addr = 0;
queue_signal(info.si_signo, &info);
break;
case EXCP0D_GPF:
if (env->eflags & VM_MASK) {
handle_vm86_fault(env);
} else {
info.si_signo = SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SI_KERNEL;
info._sifields._sigfault._addr = 0;
queue_signal(info.si_signo, &info);
}
break;
case EXCP0E_PAGE:
info.si_signo = SIGSEGV;
info.si_errno = 0;
if (!(env->error_code & 1))
info.si_code = TARGET_SEGV_MAPERR;
else
info.si_code = TARGET_SEGV_ACCERR;
info._sifields._sigfault._addr = env->cr[2];
queue_signal(info.si_signo, &info);
break;
case EXCP00_DIVZ:
if (env->eflags & VM_MASK) {
handle_vm86_trap(env, trapnr);
} else {
/* division by zero */
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = TARGET_FPE_INTDIV;
info._sifields._sigfault._addr = env->eip;
queue_signal(info.si_signo, &info);
}
break;
case EXCP01_SSTP:
case EXCP03_INT3:
if (env->eflags & VM_MASK) {
handle_vm86_trap(env, trapnr);
} else {
info.si_signo = SIGTRAP;
info.si_errno = 0;
if (trapnr == EXCP01_SSTP) {
info.si_code = TARGET_TRAP_BRKPT;
info._sifields._sigfault._addr = env->eip;
} else {
info.si_code = TARGET_SI_KERNEL;
info._sifields._sigfault._addr = 0;
}
queue_signal(info.si_signo, &info);
}
break;
case EXCP04_INTO:
case EXCP05_BOUND:
if (env->eflags & VM_MASK) {
handle_vm86_trap(env, trapnr);
} else {
info.si_signo = SIGSEGV;
info.si_errno = 0;
info.si_code = TARGET_SI_KERNEL;
info._sifields._sigfault._addr = 0;
queue_signal(info.si_signo, &info);
}
break;
case EXCP06_ILLOP:
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_ILLOPN;
info._sifields._sigfault._addr = env->eip;
queue_signal(info.si_signo, &info);
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
default:
pc = env->segs[R_CS].base + env->eip;
fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
(long)pc, trapnr);
abort();
}
process_pending_signals(env);
}
}
#endif
#ifdef TARGET_ARM
void cpu_loop(CPUARMState *env)
{
int trapnr;
unsigned int n, insn;
target_siginfo_t info;
for(;;) {
trapnr = cpu_arm_exec(env);
switch(trapnr) {
case EXCP_UDEF:
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = TARGET_ILL_ILLOPN;
info._sifields._sigfault._addr = env->regs[15];
queue_signal(info.si_signo, &info);
break;
case EXCP_SWI:
{
/* system call */
insn = ldl((void *)(env->regs[15] - 4));
n = insn & 0xffffff;
if (n >= ARM_SYSCALL_BASE) {
/* linux syscall */
n -= ARM_SYSCALL_BASE;
env->regs[0] = do_syscall(env,
n,
env->regs[0],
env->regs[1],
env->regs[2],
env->regs[3],
env->regs[4],
0);
} else {
goto error;
}
}
break;
case EXCP_INTERRUPT:
/* just indicate that signals should be handled asap */
break;
default:
error:
fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
trapnr);
cpu_arm_dump_state(env, stderr, 0);
abort();
}
process_pending_signals(env);
}
}
#endif
void usage(void)
{
printf("qemu version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n"
"usage: qemu [-h] [-d] [-L path] [-s size] program [arguments...]\n"
"Linux CPU emulator (compiled for %s emulation)\n"
"\n"
"-h print this help\n"
"-L path set the elf interpreter prefix (default=%s)\n"
"-s size set the stack size in bytes (default=%ld)\n"
"\n"
"debug options:\n"
"-d activate log (logfile=%s)\n"
"-p pagesize set the host page size to 'pagesize'\n",
TARGET_ARCH,
interp_prefix,
x86_stack_size,
DEBUG_LOGFILE);
_exit(1);
}
/* XXX: currently only used for async signals (see signal.c) */
CPUState *global_env;
/* used only if single thread */
CPUState *cpu_single_env = NULL;
/* used to free thread contexts */
TaskState *first_task_state;
int main(int argc, char **argv)
{
const char *filename;
struct target_pt_regs regs1, *regs = &regs1;
struct image_info info1, *info = &info1;
TaskState ts1, *ts = &ts1;
CPUState *env;
int optind;
const char *r;
if (argc <= 1)
usage();
loglevel = 0;
optind = 1;
for(;;) {
if (optind >= argc)
break;
r = argv[optind];
if (r[0] != '-')
break;
optind++;
r++;
if (!strcmp(r, "-")) {
break;
} else if (!strcmp(r, "d")) {
loglevel = 1;
} else if (!strcmp(r, "s")) {
r = argv[optind++];
x86_stack_size = strtol(r, (char **)&r, 0);
if (x86_stack_size <= 0)
usage();
if (*r == 'M')
x86_stack_size *= 1024 * 1024;
else if (*r == 'k' || *r == 'K')
x86_stack_size *= 1024;
} else if (!strcmp(r, "L")) {
interp_prefix = argv[optind++];
} else if (!strcmp(r, "p")) {
host_page_size = atoi(argv[optind++]);
if (host_page_size == 0 ||
(host_page_size & (host_page_size - 1)) != 0) {
fprintf(stderr, "page size must be a power of two\n");
exit(1);
}
} else {
usage();
}
}
if (optind >= argc)
usage();
filename = argv[optind];
/* init debug */
if (loglevel) {
logfile = fopen(DEBUG_LOGFILE, "w");
if (!logfile) {
perror(DEBUG_LOGFILE);
_exit(1);
}
setvbuf(logfile, NULL, _IOLBF, 0);
}
/* Zero out regs */
memset(regs, 0, sizeof(struct target_pt_regs));
/* Zero out image_info */
memset(info, 0, sizeof(struct image_info));
/* Scan interp_prefix dir for replacement files. */
init_paths(interp_prefix);
/* NOTE: we need to init the CPU at this stage to get the
host_page_size */
env = cpu_init();
if (elf_exec(filename, argv+optind, environ, regs, info) != 0) {
printf("Error loading %s\n", filename);
_exit(1);
}
if (loglevel) {
page_dump(logfile);
fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
fprintf(logfile, "brk 0x%08lx\n" , info->brk);
fprintf(logfile, "entry 0x%08lx\n" , info->entry);
}
target_set_brk((char *)info->brk);
syscall_init();
signal_init();
global_env = env;
/* build Task State */
memset(ts, 0, sizeof(TaskState));
env->opaque = ts;
ts->used = 1;
env->user_mode_only = 1;
#if defined(TARGET_I386)
/* linux register setup */
env->regs[R_EAX] = regs->eax;
env->regs[R_EBX] = regs->ebx;
env->regs[R_ECX] = regs->ecx;
env->regs[R_EDX] = regs->edx;
env->regs[R_ESI] = regs->esi;
env->regs[R_EDI] = regs->edi;
env->regs[R_EBP] = regs->ebp;
env->regs[R_ESP] = regs->esp;
env->eip = regs->eip;
/* linux interrupt setup */
env->idt.base = (void *)idt_table;
env->idt.limit = sizeof(idt_table) - 1;
set_idt(0, 0);
set_idt(1, 0);
set_idt(2, 0);
set_idt(3, 3);
set_idt(4, 3);
set_idt(5, 3);
set_idt(6, 0);
set_idt(7, 0);
set_idt(8, 0);
set_idt(9, 0);
set_idt(10, 0);
set_idt(11, 0);
set_idt(12, 0);
set_idt(13, 0);
set_idt(14, 0);
set_idt(15, 0);
set_idt(16, 0);
set_idt(17, 0);
set_idt(18, 0);
set_idt(19, 0);
set_idt(0x80, 3);
/* linux segment setup */
env->gdt.base = (void *)gdt_table;
env->gdt.limit = sizeof(gdt_table) - 1;
write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
(3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT));
write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff,
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK |
(3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT));
cpu_x86_load_seg(env, R_CS, __USER_CS);
cpu_x86_load_seg(env, R_DS, __USER_DS);
cpu_x86_load_seg(env, R_ES, __USER_DS);
cpu_x86_load_seg(env, R_SS, __USER_DS);
cpu_x86_load_seg(env, R_FS, __USER_DS);
cpu_x86_load_seg(env, R_GS, __USER_DS);
#elif defined(TARGET_ARM)
{
int i;
for(i = 0; i < 16; i++) {
env->regs[i] = regs->uregs[i];
}
env->cpsr = regs->uregs[16];
}
#else
#error unsupported target CPU
#endif
cpu_loop(env);
/* never exits */
return 0;
}
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