root / linux-user / main.c @ 4304763b
History | View | Annotate | Download (12.7 kB)
1 |
/*
|
---|---|
2 |
* qemu main
|
3 |
*
|
4 |
* Copyright (c) 2003 Fabrice Bellard
|
5 |
*
|
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.
|
10 |
*
|
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.
|
15 |
*
|
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.
|
19 |
*/
|
20 |
#include <stdlib.h> |
21 |
#include <stdio.h> |
22 |
#include <stdarg.h> |
23 |
#include <string.h> |
24 |
#include <errno.h> |
25 |
#include <unistd.h> |
26 |
|
27 |
#include "qemu.h" |
28 |
|
29 |
#include "cpu-i386.h" |
30 |
|
31 |
#define DEBUG_LOGFILE "/tmp/qemu.log" |
32 |
|
33 |
FILE *logfile = NULL;
|
34 |
int loglevel;
|
35 |
static const char *interp_prefix = CONFIG_QEMU_PREFIX; |
36 |
|
37 |
#ifdef __i386__
|
38 |
/* Force usage of an ELF interpreter even if it is an ELF shared
|
39 |
object ! */
|
40 |
const char interp[] __attribute__((section(".interp"))) = "/lib/ld-linux.so.2"; |
41 |
#endif
|
42 |
|
43 |
/* for recent libc, we add these dummies symbol which are not declared
|
44 |
when generating a linked object (bug in ld ?) */
|
45 |
#if __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3) |
46 |
long __init_array_start[0]; |
47 |
long __init_array_end[0]; |
48 |
long __fini_array_start[0]; |
49 |
long __fini_array_end[0]; |
50 |
#endif
|
51 |
|
52 |
/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
|
53 |
we allocate a bigger stack. Need a better solution, for example
|
54 |
by remapping the process stack directly at the right place */
|
55 |
unsigned long x86_stack_size = 512 * 1024; |
56 |
|
57 |
void gemu_log(const char *fmt, ...) |
58 |
{ |
59 |
va_list ap; |
60 |
|
61 |
va_start(ap, fmt); |
62 |
vfprintf(stderr, fmt, ap); |
63 |
va_end(ap); |
64 |
} |
65 |
|
66 |
/***********************************************************/
|
67 |
/* CPUX86 core interface */
|
68 |
|
69 |
void cpu_x86_outb(CPUX86State *env, int addr, int val) |
70 |
{ |
71 |
fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
|
72 |
} |
73 |
|
74 |
void cpu_x86_outw(CPUX86State *env, int addr, int val) |
75 |
{ |
76 |
fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
|
77 |
} |
78 |
|
79 |
void cpu_x86_outl(CPUX86State *env, int addr, int val) |
80 |
{ |
81 |
fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
|
82 |
} |
83 |
|
84 |
int cpu_x86_inb(CPUX86State *env, int addr) |
85 |
{ |
86 |
fprintf(stderr, "inb: port=0x%04x\n", addr);
|
87 |
return 0; |
88 |
} |
89 |
|
90 |
int cpu_x86_inw(CPUX86State *env, int addr) |
91 |
{ |
92 |
fprintf(stderr, "inw: port=0x%04x\n", addr);
|
93 |
return 0; |
94 |
} |
95 |
|
96 |
int cpu_x86_inl(CPUX86State *env, int addr) |
97 |
{ |
98 |
fprintf(stderr, "inl: port=0x%04x\n", addr);
|
99 |
return 0; |
100 |
} |
101 |
|
102 |
static void write_dt(void *ptr, unsigned long addr, unsigned long limit, |
103 |
int flags)
|
104 |
{ |
105 |
unsigned int e1, e2; |
106 |
e1 = (addr << 16) | (limit & 0xffff); |
107 |
e2 = ((addr >> 16) & 0xff) | (addr & 0xff000000) | (limit & 0x000f0000); |
108 |
e2 |= flags; |
109 |
stl((uint8_t *)ptr, e1); |
110 |
stl((uint8_t *)ptr + 4, e2);
|
111 |
} |
112 |
|
113 |
static void set_gate(void *ptr, unsigned int type, unsigned int dpl, |
114 |
unsigned long addr, unsigned int sel) |
115 |
{ |
116 |
unsigned int e1, e2; |
117 |
e1 = (addr & 0xffff) | (sel << 16); |
118 |
e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8); |
119 |
stl((uint8_t *)ptr, e1); |
120 |
stl((uint8_t *)ptr + 4, e2);
|
121 |
} |
122 |
|
123 |
uint64_t gdt_table[6];
|
124 |
uint64_t idt_table[256];
|
125 |
|
126 |
/* only dpl matters as we do only user space emulation */
|
127 |
static void set_idt(int n, unsigned int dpl) |
128 |
{ |
129 |
set_gate(idt_table + n, 0, dpl, 0, 0); |
130 |
} |
131 |
|
132 |
void cpu_loop(CPUX86State *env)
|
133 |
{ |
134 |
int trapnr;
|
135 |
uint8_t *pc; |
136 |
target_siginfo_t info; |
137 |
|
138 |
for(;;) {
|
139 |
trapnr = cpu_x86_exec(env); |
140 |
switch(trapnr) {
|
141 |
case 0x80: |
142 |
/* linux syscall */
|
143 |
env->regs[R_EAX] = do_syscall(env, |
144 |
env->regs[R_EAX], |
145 |
env->regs[R_EBX], |
146 |
env->regs[R_ECX], |
147 |
env->regs[R_EDX], |
148 |
env->regs[R_ESI], |
149 |
env->regs[R_EDI], |
150 |
env->regs[R_EBP]); |
151 |
break;
|
152 |
case EXCP0B_NOSEG:
|
153 |
case EXCP0C_STACK:
|
154 |
info.si_signo = SIGBUS; |
155 |
info.si_errno = 0;
|
156 |
info.si_code = TARGET_SI_KERNEL; |
157 |
info._sifields._sigfault._addr = 0;
|
158 |
queue_signal(info.si_signo, &info); |
159 |
break;
|
160 |
case EXCP0D_GPF:
|
161 |
if (env->eflags & VM_MASK) {
|
162 |
handle_vm86_fault(env); |
163 |
} else {
|
164 |
info.si_signo = SIGSEGV; |
165 |
info.si_errno = 0;
|
166 |
info.si_code = TARGET_SI_KERNEL; |
167 |
info._sifields._sigfault._addr = 0;
|
168 |
queue_signal(info.si_signo, &info); |
169 |
} |
170 |
break;
|
171 |
case EXCP0E_PAGE:
|
172 |
info.si_signo = SIGSEGV; |
173 |
info.si_errno = 0;
|
174 |
if (!(env->error_code & 1)) |
175 |
info.si_code = TARGET_SEGV_MAPERR; |
176 |
else
|
177 |
info.si_code = TARGET_SEGV_ACCERR; |
178 |
info._sifields._sigfault._addr = env->cr2; |
179 |
queue_signal(info.si_signo, &info); |
180 |
break;
|
181 |
case EXCP00_DIVZ:
|
182 |
if (env->eflags & VM_MASK) {
|
183 |
handle_vm86_trap(env, trapnr); |
184 |
} else {
|
185 |
/* division by zero */
|
186 |
info.si_signo = SIGFPE; |
187 |
info.si_errno = 0;
|
188 |
info.si_code = TARGET_FPE_INTDIV; |
189 |
info._sifields._sigfault._addr = env->eip; |
190 |
queue_signal(info.si_signo, &info); |
191 |
} |
192 |
break;
|
193 |
case EXCP01_SSTP:
|
194 |
case EXCP03_INT3:
|
195 |
if (env->eflags & VM_MASK) {
|
196 |
handle_vm86_trap(env, trapnr); |
197 |
} else {
|
198 |
info.si_signo = SIGTRAP; |
199 |
info.si_errno = 0;
|
200 |
if (trapnr == EXCP01_SSTP) {
|
201 |
info.si_code = TARGET_TRAP_BRKPT; |
202 |
info._sifields._sigfault._addr = env->eip; |
203 |
} else {
|
204 |
info.si_code = TARGET_SI_KERNEL; |
205 |
info._sifields._sigfault._addr = 0;
|
206 |
} |
207 |
queue_signal(info.si_signo, &info); |
208 |
} |
209 |
break;
|
210 |
case EXCP04_INTO:
|
211 |
case EXCP05_BOUND:
|
212 |
if (env->eflags & VM_MASK) {
|
213 |
handle_vm86_trap(env, trapnr); |
214 |
} else {
|
215 |
info.si_signo = SIGSEGV; |
216 |
info.si_errno = 0;
|
217 |
info.si_code = TARGET_SI_KERNEL; |
218 |
info._sifields._sigfault._addr = 0;
|
219 |
queue_signal(info.si_signo, &info); |
220 |
} |
221 |
break;
|
222 |
case EXCP06_ILLOP:
|
223 |
info.si_signo = SIGILL; |
224 |
info.si_errno = 0;
|
225 |
info.si_code = TARGET_ILL_ILLOPN; |
226 |
info._sifields._sigfault._addr = env->eip; |
227 |
queue_signal(info.si_signo, &info); |
228 |
break;
|
229 |
case EXCP_INTERRUPT:
|
230 |
/* just indicate that signals should be handled asap */
|
231 |
break;
|
232 |
default:
|
233 |
pc = env->seg_cache[R_CS].base + env->eip; |
234 |
fprintf(stderr, "qemu: 0x%08lx: unhandled CPU exception 0x%x - aborting\n",
|
235 |
(long)pc, trapnr);
|
236 |
abort(); |
237 |
} |
238 |
process_pending_signals(env); |
239 |
} |
240 |
} |
241 |
|
242 |
void usage(void) |
243 |
{ |
244 |
printf("qemu version " QEMU_VERSION ", Copyright (c) 2003 Fabrice Bellard\n" |
245 |
"usage: qemu [-h] [-d] [-L path] [-s size] program [arguments...]\n"
|
246 |
"Linux x86 emulator\n"
|
247 |
"\n"
|
248 |
"-h print this help\n"
|
249 |
"-L path set the x86 elf interpreter prefix (default=%s)\n"
|
250 |
"-s size set the x86 stack size in bytes (default=%ld)\n"
|
251 |
"\n"
|
252 |
"debug options:\n"
|
253 |
"-d activate log (logfile=%s)\n"
|
254 |
"-p pagesize set the host page size to 'pagesize'\n",
|
255 |
interp_prefix, |
256 |
x86_stack_size, |
257 |
DEBUG_LOGFILE); |
258 |
_exit(1);
|
259 |
} |
260 |
|
261 |
/* XXX: currently only used for async signals (see signal.c) */
|
262 |
CPUX86State *global_env; |
263 |
/* used to free thread contexts */
|
264 |
TaskState *first_task_state; |
265 |
|
266 |
int main(int argc, char **argv) |
267 |
{ |
268 |
const char *filename; |
269 |
struct target_pt_regs regs1, *regs = ®s1;
|
270 |
struct image_info info1, *info = &info1;
|
271 |
TaskState ts1, *ts = &ts1; |
272 |
CPUX86State *env; |
273 |
int optind;
|
274 |
const char *r; |
275 |
|
276 |
if (argc <= 1) |
277 |
usage(); |
278 |
|
279 |
loglevel = 0;
|
280 |
optind = 1;
|
281 |
for(;;) {
|
282 |
if (optind >= argc)
|
283 |
break;
|
284 |
r = argv[optind]; |
285 |
if (r[0] != '-') |
286 |
break;
|
287 |
optind++; |
288 |
r++; |
289 |
if (!strcmp(r, "-")) { |
290 |
break;
|
291 |
} else if (!strcmp(r, "d")) { |
292 |
loglevel = 1;
|
293 |
} else if (!strcmp(r, "s")) { |
294 |
r = argv[optind++]; |
295 |
x86_stack_size = strtol(r, (char **)&r, 0); |
296 |
if (x86_stack_size <= 0) |
297 |
usage(); |
298 |
if (*r == 'M') |
299 |
x86_stack_size *= 1024 * 1024; |
300 |
else if (*r == 'k' || *r == 'K') |
301 |
x86_stack_size *= 1024;
|
302 |
} else if (!strcmp(r, "L")) { |
303 |
interp_prefix = argv[optind++]; |
304 |
} else if (!strcmp(r, "p")) { |
305 |
host_page_size = atoi(argv[optind++]); |
306 |
if (host_page_size == 0 || |
307 |
(host_page_size & (host_page_size - 1)) != 0) { |
308 |
fprintf(stderr, "page size must be a power of two\n");
|
309 |
exit(1);
|
310 |
} |
311 |
} else {
|
312 |
usage(); |
313 |
} |
314 |
} |
315 |
if (optind >= argc)
|
316 |
usage(); |
317 |
filename = argv[optind]; |
318 |
|
319 |
/* init debug */
|
320 |
if (loglevel) {
|
321 |
logfile = fopen(DEBUG_LOGFILE, "w");
|
322 |
if (!logfile) {
|
323 |
perror(DEBUG_LOGFILE); |
324 |
_exit(1);
|
325 |
} |
326 |
setvbuf(logfile, NULL, _IOLBF, 0); |
327 |
} |
328 |
|
329 |
/* Zero out regs */
|
330 |
memset(regs, 0, sizeof(struct target_pt_regs)); |
331 |
|
332 |
/* Zero out image_info */
|
333 |
memset(info, 0, sizeof(struct image_info)); |
334 |
|
335 |
/* Scan interp_prefix dir for replacement files. */
|
336 |
init_paths(interp_prefix); |
337 |
|
338 |
/* NOTE: we need to init the CPU at this stage to get the
|
339 |
host_page_size */
|
340 |
env = cpu_x86_init(); |
341 |
|
342 |
if (elf_exec(filename, argv+optind, environ, regs, info) != 0) { |
343 |
printf("Error loading %s\n", filename);
|
344 |
_exit(1);
|
345 |
} |
346 |
|
347 |
if (loglevel) {
|
348 |
page_dump(logfile); |
349 |
|
350 |
fprintf(logfile, "start_brk 0x%08lx\n" , info->start_brk);
|
351 |
fprintf(logfile, "end_code 0x%08lx\n" , info->end_code);
|
352 |
fprintf(logfile, "start_code 0x%08lx\n" , info->start_code);
|
353 |
fprintf(logfile, "end_data 0x%08lx\n" , info->end_data);
|
354 |
fprintf(logfile, "start_stack 0x%08lx\n" , info->start_stack);
|
355 |
fprintf(logfile, "brk 0x%08lx\n" , info->brk);
|
356 |
fprintf(logfile, "esp 0x%08lx\n" , regs->esp);
|
357 |
fprintf(logfile, "eip 0x%08lx\n" , regs->eip);
|
358 |
} |
359 |
|
360 |
target_set_brk((char *)info->brk);
|
361 |
syscall_init(); |
362 |
signal_init(); |
363 |
|
364 |
global_env = env; |
365 |
|
366 |
/* build Task State */
|
367 |
memset(ts, 0, sizeof(TaskState)); |
368 |
env->opaque = ts; |
369 |
ts->used = 1;
|
370 |
|
371 |
/* linux register setup */
|
372 |
env->regs[R_EAX] = regs->eax; |
373 |
env->regs[R_EBX] = regs->ebx; |
374 |
env->regs[R_ECX] = regs->ecx; |
375 |
env->regs[R_EDX] = regs->edx; |
376 |
env->regs[R_ESI] = regs->esi; |
377 |
env->regs[R_EDI] = regs->edi; |
378 |
env->regs[R_EBP] = regs->ebp; |
379 |
env->regs[R_ESP] = regs->esp; |
380 |
env->eip = regs->eip; |
381 |
|
382 |
/* linux interrupt setup */
|
383 |
env->idt.base = (void *)idt_table;
|
384 |
env->idt.limit = sizeof(idt_table) - 1; |
385 |
set_idt(0, 0); |
386 |
set_idt(1, 0); |
387 |
set_idt(2, 0); |
388 |
set_idt(3, 3); |
389 |
set_idt(4, 3); |
390 |
set_idt(5, 3); |
391 |
set_idt(6, 0); |
392 |
set_idt(7, 0); |
393 |
set_idt(8, 0); |
394 |
set_idt(9, 0); |
395 |
set_idt(10, 0); |
396 |
set_idt(11, 0); |
397 |
set_idt(12, 0); |
398 |
set_idt(13, 0); |
399 |
set_idt(14, 0); |
400 |
set_idt(15, 0); |
401 |
set_idt(16, 0); |
402 |
set_idt(17, 0); |
403 |
set_idt(18, 0); |
404 |
set_idt(19, 0); |
405 |
set_idt(0x80, 3); |
406 |
|
407 |
/* linux segment setup */
|
408 |
env->gdt.base = (void *)gdt_table;
|
409 |
env->gdt.limit = sizeof(gdt_table) - 1; |
410 |
write_dt(&gdt_table[__USER_CS >> 3], 0, 0xfffff, |
411 |
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | |
412 |
(3 << DESC_DPL_SHIFT) | (0xa << DESC_TYPE_SHIFT)); |
413 |
write_dt(&gdt_table[__USER_DS >> 3], 0, 0xfffff, |
414 |
DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | DESC_S_MASK | |
415 |
(3 << DESC_DPL_SHIFT) | (0x2 << DESC_TYPE_SHIFT)); |
416 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
417 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
418 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
419 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
420 |
cpu_x86_load_seg(env, R_FS, __USER_DS); |
421 |
cpu_x86_load_seg(env, R_GS, __USER_DS); |
422 |
|
423 |
cpu_loop(env); |
424 |
/* never exits */
|
425 |
return 0; |
426 |
} |