root / linux-user / signal.c @ 9de5e440
History | View | Annotate | Download (24.6 kB)
| 1 |
/*
|
|---|---|
| 2 |
* Emulation of Linux signals
|
| 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 <string.h> |
| 23 |
#include <stdarg.h> |
| 24 |
#include <signal.h> |
| 25 |
#include <errno.h> |
| 26 |
#include <sys/ucontext.h> |
| 27 |
|
| 28 |
#include "gemu.h" |
| 29 |
|
| 30 |
/* signal handling inspired from em86. */
|
| 31 |
|
| 32 |
//#define DEBUG_SIGNAL
|
| 33 |
|
| 34 |
#define MAX_SIGQUEUE_SIZE 1024 |
| 35 |
|
| 36 |
struct sigqueue {
|
| 37 |
struct sigqueue *next;
|
| 38 |
target_siginfo_t info; |
| 39 |
}; |
| 40 |
|
| 41 |
struct emulated_sigaction {
|
| 42 |
struct target_sigaction sa;
|
| 43 |
int pending; /* true if signal is pending */ |
| 44 |
struct sigqueue *first;
|
| 45 |
struct sigqueue info; /* in order to always have memory for the |
| 46 |
first signal, we put it here */
|
| 47 |
}; |
| 48 |
|
| 49 |
static struct emulated_sigaction sigact_table[TARGET_NSIG]; |
| 50 |
static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ |
| 51 |
static struct sigqueue *first_free; /* first free siginfo queue entry */ |
| 52 |
static int signal_pending; /* non zero if a signal may be pending */ |
| 53 |
|
| 54 |
static void host_signal_handler(int host_signum, siginfo_t *info, |
| 55 |
void *puc);
|
| 56 |
|
| 57 |
/* XXX: do it properly */
|
| 58 |
static inline int host_to_target_signal(int sig) |
| 59 |
{
|
| 60 |
return sig;
|
| 61 |
} |
| 62 |
|
| 63 |
static inline int target_to_host_signal(int sig) |
| 64 |
{
|
| 65 |
return sig;
|
| 66 |
} |
| 67 |
|
| 68 |
void host_to_target_sigset(target_sigset_t *d, sigset_t *s)
|
| 69 |
{
|
| 70 |
int i;
|
| 71 |
for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
| 72 |
d->sig[i] = tswapl(((unsigned long *)s)[i]); |
| 73 |
} |
| 74 |
} |
| 75 |
|
| 76 |
void target_to_host_sigset(sigset_t *d, target_sigset_t *s)
|
| 77 |
{
|
| 78 |
int i;
|
| 79 |
for(i = 0;i < TARGET_NSIG_WORDS; i++) { |
| 80 |
((unsigned long *)d)[i] = tswapl(s->sig[i]); |
| 81 |
} |
| 82 |
} |
| 83 |
|
| 84 |
void host_to_target_old_sigset(target_ulong *old_sigset,
|
| 85 |
const sigset_t *sigset)
|
| 86 |
{
|
| 87 |
*old_sigset = tswap32(*(unsigned long *)sigset & 0xffffffff); |
| 88 |
} |
| 89 |
|
| 90 |
void target_to_host_old_sigset(sigset_t *sigset,
|
| 91 |
const target_ulong *old_sigset)
|
| 92 |
{
|
| 93 |
sigemptyset(sigset); |
| 94 |
*(unsigned long *)sigset = tswapl(*old_sigset); |
| 95 |
} |
| 96 |
|
| 97 |
/* siginfo conversion */
|
| 98 |
|
| 99 |
static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, |
| 100 |
const siginfo_t *info)
|
| 101 |
{
|
| 102 |
int sig;
|
| 103 |
sig = host_to_target_signal(info->si_signo); |
| 104 |
tinfo->si_signo = sig; |
| 105 |
tinfo->si_errno = 0;
|
| 106 |
tinfo->si_code = 0;
|
| 107 |
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
|
| 108 |
/* should never come here, but who knows. The information for
|
| 109 |
the target is irrelevant */
|
| 110 |
tinfo->_sifields._sigfault._addr = 0;
|
| 111 |
} else if (sig >= TARGET_SIGRTMIN) { |
| 112 |
tinfo->_sifields._rt._pid = info->si_pid; |
| 113 |
tinfo->_sifields._rt._uid = info->si_uid; |
| 114 |
/* XXX: potential problem if 64 bit */
|
| 115 |
tinfo->_sifields._rt._sigval.sival_ptr = |
| 116 |
(target_ulong)info->si_value.sival_ptr; |
| 117 |
} |
| 118 |
} |
| 119 |
|
| 120 |
static void tswap_siginfo(target_siginfo_t *tinfo, |
| 121 |
const target_siginfo_t *info)
|
| 122 |
{
|
| 123 |
int sig;
|
| 124 |
sig = info->si_signo; |
| 125 |
tinfo->si_signo = tswap32(sig); |
| 126 |
tinfo->si_errno = tswap32(info->si_errno); |
| 127 |
tinfo->si_code = tswap32(info->si_code); |
| 128 |
if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || sig == SIGBUS) {
|
| 129 |
tinfo->_sifields._sigfault._addr = |
| 130 |
tswapl(info->_sifields._sigfault._addr); |
| 131 |
} else if (sig >= TARGET_SIGRTMIN) { |
| 132 |
tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid); |
| 133 |
tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid); |
| 134 |
tinfo->_sifields._rt._sigval.sival_ptr = |
| 135 |
tswapl(info->_sifields._rt._sigval.sival_ptr); |
| 136 |
} |
| 137 |
} |
| 138 |
|
| 139 |
|
| 140 |
void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) |
| 141 |
{
|
| 142 |
host_to_target_siginfo_noswap(tinfo, info); |
| 143 |
tswap_siginfo(tinfo, tinfo); |
| 144 |
} |
| 145 |
|
| 146 |
/* XXX: we support only POSIX RT signals are used. */
|
| 147 |
/* XXX: find a solution for 64 bit (additionnal malloced data is needed) */
|
| 148 |
void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) |
| 149 |
{
|
| 150 |
info->si_signo = tswap32(tinfo->si_signo); |
| 151 |
info->si_errno = tswap32(tinfo->si_errno); |
| 152 |
info->si_code = tswap32(tinfo->si_code); |
| 153 |
info->si_pid = tswap32(tinfo->_sifields._rt._pid); |
| 154 |
info->si_uid = tswap32(tinfo->_sifields._rt._uid); |
| 155 |
info->si_value.sival_ptr = |
| 156 |
(void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr);
|
| 157 |
} |
| 158 |
|
| 159 |
void signal_init(void) |
| 160 |
{
|
| 161 |
struct sigaction act;
|
| 162 |
int i;
|
| 163 |
|
| 164 |
/* set all host signal handlers. ALL signals are blocked during
|
| 165 |
the handlers to serialize them. */
|
| 166 |
sigfillset(&act.sa_mask); |
| 167 |
act.sa_flags = SA_SIGINFO; |
| 168 |
act.sa_sigaction = host_signal_handler; |
| 169 |
for(i = 1; i < NSIG; i++) { |
| 170 |
sigaction(i, &act, NULL);
|
| 171 |
} |
| 172 |
|
| 173 |
memset(sigact_table, 0, sizeof(sigact_table)); |
| 174 |
|
| 175 |
first_free = &sigqueue_table[0];
|
| 176 |
for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) |
| 177 |
sigqueue_table[i].next = &sigqueue_table[i + 1];
|
| 178 |
sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; |
| 179 |
} |
| 180 |
|
| 181 |
/* signal queue handling */
|
| 182 |
|
| 183 |
static inline struct sigqueue *alloc_sigqueue(void) |
| 184 |
{
|
| 185 |
struct sigqueue *q = first_free;
|
| 186 |
if (!q)
|
| 187 |
return NULL; |
| 188 |
first_free = q->next; |
| 189 |
return q;
|
| 190 |
} |
| 191 |
|
| 192 |
static inline void free_sigqueue(struct sigqueue *q) |
| 193 |
{
|
| 194 |
q->next = first_free; |
| 195 |
first_free = q; |
| 196 |
} |
| 197 |
|
| 198 |
/* abort execution with signal */
|
| 199 |
void __attribute((noreturn)) force_sig(int sig) |
| 200 |
{
|
| 201 |
int host_sig;
|
| 202 |
host_sig = target_to_host_signal(sig); |
| 203 |
fprintf(stderr, "gemu: uncaught target signal %d (%s) - exiting\n",
|
| 204 |
sig, strsignal(host_sig)); |
| 205 |
#if 1 |
| 206 |
_exit(-host_sig); |
| 207 |
#else
|
| 208 |
{
|
| 209 |
struct sigaction act;
|
| 210 |
sigemptyset(&act.sa_mask); |
| 211 |
act.sa_flags = SA_SIGINFO; |
| 212 |
act.sa_sigaction = SIG_DFL; |
| 213 |
sigaction(SIGABRT, &act, NULL);
|
| 214 |
abort(); |
| 215 |
} |
| 216 |
#endif
|
| 217 |
} |
| 218 |
|
| 219 |
/* queue a signal so that it will be send to the virtual CPU as soon
|
| 220 |
as possible */
|
| 221 |
int queue_signal(int sig, target_siginfo_t *info) |
| 222 |
{
|
| 223 |
struct emulated_sigaction *k;
|
| 224 |
struct sigqueue *q, **pq;
|
| 225 |
target_ulong handler; |
| 226 |
|
| 227 |
#if defined(DEBUG_SIGNAL)
|
| 228 |
fprintf(stderr, "queue_sigal: sig=%d\n",
|
| 229 |
sig); |
| 230 |
#endif
|
| 231 |
k = &sigact_table[sig - 1];
|
| 232 |
handler = k->sa._sa_handler; |
| 233 |
if (handler == TARGET_SIG_DFL) {
|
| 234 |
/* default handler : ignore some signal. The other are fatal */
|
| 235 |
if (sig != TARGET_SIGCHLD &&
|
| 236 |
sig != TARGET_SIGURG && |
| 237 |
sig != TARGET_SIGWINCH) {
|
| 238 |
force_sig(sig); |
| 239 |
} else {
|
| 240 |
return 0; /* indicate ignored */ |
| 241 |
} |
| 242 |
} else if (handler == TARGET_SIG_IGN) { |
| 243 |
/* ignore signal */
|
| 244 |
return 0; |
| 245 |
} else if (handler == TARGET_SIG_ERR) { |
| 246 |
force_sig(sig); |
| 247 |
} else {
|
| 248 |
pq = &k->first; |
| 249 |
if (sig < TARGET_SIGRTMIN) {
|
| 250 |
/* if non real time signal, we queue exactly one signal */
|
| 251 |
if (!k->pending)
|
| 252 |
q = &k->info; |
| 253 |
else
|
| 254 |
return 0; |
| 255 |
} else {
|
| 256 |
if (!k->pending) {
|
| 257 |
/* first signal */
|
| 258 |
q = &k->info; |
| 259 |
} else {
|
| 260 |
q = alloc_sigqueue(); |
| 261 |
if (!q)
|
| 262 |
return -EAGAIN;
|
| 263 |
while (*pq != NULL) |
| 264 |
pq = &(*pq)->next; |
| 265 |
} |
| 266 |
} |
| 267 |
*pq = q; |
| 268 |
q->info = *info; |
| 269 |
q->next = NULL;
|
| 270 |
k->pending = 1;
|
| 271 |
/* signal that a new signal is pending */
|
| 272 |
signal_pending = 1;
|
| 273 |
return 1; /* indicates that the signal was queued */ |
| 274 |
} |
| 275 |
} |
| 276 |
|
| 277 |
#if defined(DEBUG_SIGNAL)
|
| 278 |
#ifdef __i386__
|
| 279 |
static void dump_regs(struct ucontext *uc) |
| 280 |
{
|
| 281 |
fprintf(stderr, |
| 282 |
"EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
|
| 283 |
"ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
|
| 284 |
"EFL=%08x EIP=%08x\n",
|
| 285 |
uc->uc_mcontext.gregs[EAX], |
| 286 |
uc->uc_mcontext.gregs[EBX], |
| 287 |
uc->uc_mcontext.gregs[ECX], |
| 288 |
uc->uc_mcontext.gregs[EDX], |
| 289 |
uc->uc_mcontext.gregs[ESI], |
| 290 |
uc->uc_mcontext.gregs[EDI], |
| 291 |
uc->uc_mcontext.gregs[EBP], |
| 292 |
uc->uc_mcontext.gregs[ESP], |
| 293 |
uc->uc_mcontext.gregs[EFL], |
| 294 |
uc->uc_mcontext.gregs[EIP]); |
| 295 |
} |
| 296 |
#else
|
| 297 |
static void dump_regs(struct ucontext *uc) |
| 298 |
{
|
| 299 |
} |
| 300 |
#endif
|
| 301 |
|
| 302 |
#endif
|
| 303 |
|
| 304 |
static void host_signal_handler(int host_signum, siginfo_t *info, |
| 305 |
void *puc)
|
| 306 |
{
|
| 307 |
int sig;
|
| 308 |
target_siginfo_t tinfo; |
| 309 |
|
| 310 |
/* the CPU emulator uses some host signals to detect exceptions,
|
| 311 |
we we forward to it some signals */
|
| 312 |
if (host_signum == SIGSEGV || host_signum == SIGBUS) {
|
| 313 |
if (cpu_x86_signal_handler(host_signum, info, puc))
|
| 314 |
return;
|
| 315 |
} |
| 316 |
|
| 317 |
/* get target signal number */
|
| 318 |
sig = host_to_target_signal(host_signum); |
| 319 |
if (sig < 1 || sig > TARGET_NSIG) |
| 320 |
return;
|
| 321 |
#if defined(DEBUG_SIGNAL)
|
| 322 |
fprintf(stderr, "gemu: got signal %d\n", sig);
|
| 323 |
dump_regs(puc); |
| 324 |
#endif
|
| 325 |
host_to_target_siginfo_noswap(&tinfo, info); |
| 326 |
if (queue_signal(sig, &tinfo) == 1) { |
| 327 |
/* interrupt the virtual CPU as soon as possible */
|
| 328 |
cpu_x86_interrupt(global_env); |
| 329 |
} |
| 330 |
} |
| 331 |
|
| 332 |
int do_sigaction(int sig, const struct target_sigaction *act, |
| 333 |
struct target_sigaction *oact)
|
| 334 |
{
|
| 335 |
struct emulated_sigaction *k;
|
| 336 |
|
| 337 |
if (sig < 1 || sig > TARGET_NSIG) |
| 338 |
return -EINVAL;
|
| 339 |
k = &sigact_table[sig - 1];
|
| 340 |
#if defined(DEBUG_SIGNAL) && 0 |
| 341 |
fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n",
|
| 342 |
sig, (int)act, (int)oact); |
| 343 |
#endif
|
| 344 |
if (oact) {
|
| 345 |
oact->_sa_handler = tswapl(k->sa._sa_handler); |
| 346 |
oact->sa_flags = tswapl(k->sa.sa_flags); |
| 347 |
oact->sa_restorer = tswapl(k->sa.sa_restorer); |
| 348 |
oact->sa_mask = k->sa.sa_mask; |
| 349 |
} |
| 350 |
if (act) {
|
| 351 |
k->sa._sa_handler = tswapl(act->_sa_handler); |
| 352 |
k->sa.sa_flags = tswapl(act->sa_flags); |
| 353 |
k->sa.sa_restorer = tswapl(act->sa_restorer); |
| 354 |
k->sa.sa_mask = act->sa_mask; |
| 355 |
} |
| 356 |
return 0; |
| 357 |
} |
| 358 |
|
| 359 |
#ifdef TARGET_I386
|
| 360 |
|
| 361 |
/* from the Linux kernel */
|
| 362 |
|
| 363 |
struct target_fpreg {
|
| 364 |
uint16_t significand[4];
|
| 365 |
uint16_t exponent; |
| 366 |
}; |
| 367 |
|
| 368 |
struct target_fpxreg {
|
| 369 |
uint16_t significand[4];
|
| 370 |
uint16_t exponent; |
| 371 |
uint16_t padding[3];
|
| 372 |
}; |
| 373 |
|
| 374 |
struct target_xmmreg {
|
| 375 |
target_ulong element[4];
|
| 376 |
}; |
| 377 |
|
| 378 |
struct target_fpstate {
|
| 379 |
/* Regular FPU environment */
|
| 380 |
target_ulong cw; |
| 381 |
target_ulong sw; |
| 382 |
target_ulong tag; |
| 383 |
target_ulong ipoff; |
| 384 |
target_ulong cssel; |
| 385 |
target_ulong dataoff; |
| 386 |
target_ulong datasel; |
| 387 |
struct target_fpreg _st[8]; |
| 388 |
uint16_t status; |
| 389 |
uint16_t magic; /* 0xffff = regular FPU data only */
|
| 390 |
|
| 391 |
/* FXSR FPU environment */
|
| 392 |
target_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ |
| 393 |
target_ulong mxcsr; |
| 394 |
target_ulong reserved; |
| 395 |
struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ |
| 396 |
struct target_xmmreg _xmm[8]; |
| 397 |
target_ulong padding[56];
|
| 398 |
}; |
| 399 |
|
| 400 |
#define X86_FXSR_MAGIC 0x0000 |
| 401 |
|
| 402 |
struct target_sigcontext {
|
| 403 |
uint16_t gs, __gsh; |
| 404 |
uint16_t fs, __fsh; |
| 405 |
uint16_t es, __esh; |
| 406 |
uint16_t ds, __dsh; |
| 407 |
target_ulong edi; |
| 408 |
target_ulong esi; |
| 409 |
target_ulong ebp; |
| 410 |
target_ulong esp; |
| 411 |
target_ulong ebx; |
| 412 |
target_ulong edx; |
| 413 |
target_ulong ecx; |
| 414 |
target_ulong eax; |
| 415 |
target_ulong trapno; |
| 416 |
target_ulong err; |
| 417 |
target_ulong eip; |
| 418 |
uint16_t cs, __csh; |
| 419 |
target_ulong eflags; |
| 420 |
target_ulong esp_at_signal; |
| 421 |
uint16_t ss, __ssh; |
| 422 |
target_ulong fpstate; /* pointer */
|
| 423 |
target_ulong oldmask; |
| 424 |
target_ulong cr2; |
| 425 |
}; |
| 426 |
|
| 427 |
typedef struct target_sigaltstack { |
| 428 |
target_ulong ss_sp; |
| 429 |
int ss_flags;
|
| 430 |
target_ulong ss_size; |
| 431 |
} target_stack_t; |
| 432 |
|
| 433 |
struct target_ucontext {
|
| 434 |
target_ulong uc_flags; |
| 435 |
target_ulong uc_link; |
| 436 |
target_stack_t uc_stack; |
| 437 |
struct target_sigcontext uc_mcontext;
|
| 438 |
target_sigset_t uc_sigmask; /* mask last for extensibility */
|
| 439 |
}; |
| 440 |
|
| 441 |
struct sigframe
|
| 442 |
{
|
| 443 |
target_ulong pretcode; |
| 444 |
int sig;
|
| 445 |
struct target_sigcontext sc;
|
| 446 |
struct target_fpstate fpstate;
|
| 447 |
target_ulong extramask[TARGET_NSIG_WORDS-1];
|
| 448 |
char retcode[8]; |
| 449 |
}; |
| 450 |
|
| 451 |
struct rt_sigframe
|
| 452 |
{
|
| 453 |
target_ulong pretcode; |
| 454 |
int sig;
|
| 455 |
target_ulong pinfo; |
| 456 |
target_ulong puc; |
| 457 |
struct target_siginfo info;
|
| 458 |
struct target_ucontext uc;
|
| 459 |
struct target_fpstate fpstate;
|
| 460 |
char retcode[8]; |
| 461 |
}; |
| 462 |
|
| 463 |
/*
|
| 464 |
* Set up a signal frame.
|
| 465 |
*/
|
| 466 |
|
| 467 |
#define __put_user(x,ptr)\
|
| 468 |
({\
|
| 469 |
int size = sizeof(*ptr);\ |
| 470 |
switch(size) {\
|
| 471 |
case 1:\ |
| 472 |
stb(ptr, (typeof(*ptr))(x));\ |
| 473 |
break;\
|
| 474 |
case 2:\ |
| 475 |
stw(ptr, (typeof(*ptr))(x));\ |
| 476 |
break;\
|
| 477 |
case 4:\ |
| 478 |
stl(ptr, (typeof(*ptr))(x));\ |
| 479 |
break;\
|
| 480 |
case 8:\ |
| 481 |
stq(ptr, (typeof(*ptr))(x));\ |
| 482 |
break;\
|
| 483 |
default:\
|
| 484 |
abort();\ |
| 485 |
}\ |
| 486 |
0;\
|
| 487 |
}) |
| 488 |
|
| 489 |
#define get_user(val, ptr) (typeof(*ptr))(*(ptr))
|
| 490 |
|
| 491 |
|
| 492 |
#define __copy_to_user(dst, src, size)\
|
| 493 |
({\
|
| 494 |
memcpy(dst, src, size);\ |
| 495 |
0;\
|
| 496 |
}) |
| 497 |
|
| 498 |
static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, |
| 499 |
const target_siginfo_t *info)
|
| 500 |
{
|
| 501 |
tswap_siginfo(tinfo, info); |
| 502 |
return 0; |
| 503 |
} |
| 504 |
|
| 505 |
/* XXX: save x87 state */
|
| 506 |
static int |
| 507 |
setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, |
| 508 |
CPUX86State *env, unsigned long mask) |
| 509 |
{
|
| 510 |
int err = 0; |
| 511 |
|
| 512 |
err |= __put_user(env->segs[R_GS], (unsigned int *)&sc->gs); |
| 513 |
err |= __put_user(env->segs[R_FS], (unsigned int *)&sc->fs); |
| 514 |
err |= __put_user(env->segs[R_ES], (unsigned int *)&sc->es); |
| 515 |
err |= __put_user(env->segs[R_DS], (unsigned int *)&sc->ds); |
| 516 |
err |= __put_user(env->regs[R_EDI], &sc->edi); |
| 517 |
err |= __put_user(env->regs[R_ESI], &sc->esi); |
| 518 |
err |= __put_user(env->regs[R_EBP], &sc->ebp); |
| 519 |
err |= __put_user(env->regs[R_ESP], &sc->esp); |
| 520 |
err |= __put_user(env->regs[R_EBX], &sc->ebx); |
| 521 |
err |= __put_user(env->regs[R_EDX], &sc->edx); |
| 522 |
err |= __put_user(env->regs[R_ECX], &sc->ecx); |
| 523 |
err |= __put_user(env->regs[R_EAX], &sc->eax); |
| 524 |
err |= __put_user(/*current->thread.trap_no*/ 0, &sc->trapno); |
| 525 |
err |= __put_user(/*current->thread.error_code*/ 0, &sc->err); |
| 526 |
err |= __put_user(env->eip, &sc->eip); |
| 527 |
err |= __put_user(env->segs[R_CS], (unsigned int *)&sc->cs); |
| 528 |
err |= __put_user(env->eflags, &sc->eflags); |
| 529 |
err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); |
| 530 |
err |= __put_user(env->segs[R_SS], (unsigned int *)&sc->ss); |
| 531 |
#if 0
|
| 532 |
tmp = save_i387(fpstate);
|
| 533 |
if (tmp < 0)
|
| 534 |
err = 1;
|
| 535 |
else
|
| 536 |
err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
|
| 537 |
#else
|
| 538 |
err |= __put_user(0, &sc->fpstate);
|
| 539 |
#endif
|
| 540 |
/* non-iBCS2 extensions.. */
|
| 541 |
err |= __put_user(mask, &sc->oldmask); |
| 542 |
err |= __put_user(/*current->thread.cr2*/ 0, &sc->cr2); |
| 543 |
|
| 544 |
return err;
|
| 545 |
} |
| 546 |
|
| 547 |
/*
|
| 548 |
* Determine which stack to use..
|
| 549 |
*/
|
| 550 |
|
| 551 |
static inline void * |
| 552 |
get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size)
|
| 553 |
{
|
| 554 |
unsigned long esp; |
| 555 |
|
| 556 |
/* Default to using normal stack */
|
| 557 |
esp = env->regs[R_ESP]; |
| 558 |
#if 0
|
| 559 |
/* This is the X/Open sanctioned signal stack switching. */
|
| 560 |
if (ka->sa.sa_flags & SA_ONSTACK) {
|
| 561 |
if (sas_ss_flags(esp) == 0)
|
| 562 |
esp = current->sas_ss_sp + current->sas_ss_size;
|
| 563 |
}
|
| 564 |
|
| 565 |
/* This is the legacy signal stack switching. */
|
| 566 |
else if ((regs->xss & 0xffff) != __USER_DS &&
|
| 567 |
!(ka->sa.sa_flags & SA_RESTORER) &&
|
| 568 |
ka->sa.sa_restorer) {
|
| 569 |
esp = (unsigned long) ka->sa.sa_restorer;
|
| 570 |
}
|
| 571 |
#endif
|
| 572 |
return (void *)((esp - frame_size) & -8ul); |
| 573 |
} |
| 574 |
|
| 575 |
#define TF_MASK TRAP_FLAG
|
| 576 |
|
| 577 |
static void setup_frame(int sig, struct emulated_sigaction *ka, |
| 578 |
target_sigset_t *set, CPUX86State *env) |
| 579 |
{
|
| 580 |
struct sigframe *frame;
|
| 581 |
int err = 0; |
| 582 |
|
| 583 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 584 |
|
| 585 |
#if 0
|
| 586 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
| 587 |
goto give_sigsegv;
|
| 588 |
#endif
|
| 589 |
err |= __put_user((/*current->exec_domain
|
| 590 |
&& current->exec_domain->signal_invmap
|
| 591 |
&& sig < 32
|
| 592 |
? current->exec_domain->signal_invmap[sig]
|
| 593 |
: */ sig),
|
| 594 |
&frame->sig); |
| 595 |
if (err)
|
| 596 |
goto give_sigsegv;
|
| 597 |
|
| 598 |
setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]);
|
| 599 |
if (err)
|
| 600 |
goto give_sigsegv;
|
| 601 |
|
| 602 |
if (TARGET_NSIG_WORDS > 1) { |
| 603 |
err |= __copy_to_user(frame->extramask, &set->sig[1],
|
| 604 |
sizeof(frame->extramask));
|
| 605 |
} |
| 606 |
if (err)
|
| 607 |
goto give_sigsegv;
|
| 608 |
|
| 609 |
/* Set up to return from userspace. If provided, use a stub
|
| 610 |
already in userspace. */
|
| 611 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 612 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 613 |
} else {
|
| 614 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 615 |
/* This is popl %eax ; movl $,%eax ; int $0x80 */
|
| 616 |
err |= __put_user(0xb858, (short *)(frame->retcode+0)); |
| 617 |
err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); |
| 618 |
err |= __put_user(0x80cd, (short *)(frame->retcode+6)); |
| 619 |
} |
| 620 |
|
| 621 |
if (err)
|
| 622 |
goto give_sigsegv;
|
| 623 |
|
| 624 |
/* Set up registers for signal handler */
|
| 625 |
env->regs[R_ESP] = (unsigned long) frame; |
| 626 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 627 |
|
| 628 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 629 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 630 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 631 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 632 |
env->eflags &= ~TF_MASK; |
| 633 |
|
| 634 |
return;
|
| 635 |
|
| 636 |
give_sigsegv:
|
| 637 |
if (sig == TARGET_SIGSEGV)
|
| 638 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 639 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 640 |
} |
| 641 |
|
| 642 |
static void setup_rt_frame(int sig, struct emulated_sigaction *ka, |
| 643 |
target_siginfo_t *info, |
| 644 |
target_sigset_t *set, CPUX86State *env) |
| 645 |
{
|
| 646 |
struct rt_sigframe *frame;
|
| 647 |
int err = 0; |
| 648 |
|
| 649 |
frame = get_sigframe(ka, env, sizeof(*frame));
|
| 650 |
|
| 651 |
#if 0
|
| 652 |
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
| 653 |
goto give_sigsegv;
|
| 654 |
#endif
|
| 655 |
|
| 656 |
err |= __put_user((/*current->exec_domain
|
| 657 |
&& current->exec_domain->signal_invmap
|
| 658 |
&& sig < 32
|
| 659 |
? current->exec_domain->signal_invmap[sig]
|
| 660 |
: */sig),
|
| 661 |
&frame->sig); |
| 662 |
err |= __put_user((target_ulong)&frame->info, &frame->pinfo); |
| 663 |
err |= __put_user((target_ulong)&frame->uc, &frame->puc); |
| 664 |
err |= copy_siginfo_to_user(&frame->info, info); |
| 665 |
if (err)
|
| 666 |
goto give_sigsegv;
|
| 667 |
|
| 668 |
/* Create the ucontext. */
|
| 669 |
err |= __put_user(0, &frame->uc.uc_flags);
|
| 670 |
err |= __put_user(0, &frame->uc.uc_link);
|
| 671 |
err |= __put_user(/*current->sas_ss_sp*/ 0, &frame->uc.uc_stack.ss_sp); |
| 672 |
err |= __put_user(/* sas_ss_flags(regs->esp) */ 0, |
| 673 |
&frame->uc.uc_stack.ss_flags); |
| 674 |
err |= __put_user(/* current->sas_ss_size */ 0, &frame->uc.uc_stack.ss_size); |
| 675 |
err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate, |
| 676 |
env, set->sig[0]);
|
| 677 |
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
| 678 |
if (err)
|
| 679 |
goto give_sigsegv;
|
| 680 |
|
| 681 |
/* Set up to return from userspace. If provided, use a stub
|
| 682 |
already in userspace. */
|
| 683 |
if (ka->sa.sa_flags & TARGET_SA_RESTORER) {
|
| 684 |
err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); |
| 685 |
} else {
|
| 686 |
err |= __put_user(frame->retcode, &frame->pretcode); |
| 687 |
/* This is movl $,%eax ; int $0x80 */
|
| 688 |
err |= __put_user(0xb8, (char *)(frame->retcode+0)); |
| 689 |
err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); |
| 690 |
err |= __put_user(0x80cd, (short *)(frame->retcode+5)); |
| 691 |
} |
| 692 |
|
| 693 |
if (err)
|
| 694 |
goto give_sigsegv;
|
| 695 |
|
| 696 |
/* Set up registers for signal handler */
|
| 697 |
env->regs[R_ESP] = (unsigned long) frame; |
| 698 |
env->eip = (unsigned long) ka->sa._sa_handler; |
| 699 |
|
| 700 |
cpu_x86_load_seg(env, R_DS, __USER_DS); |
| 701 |
cpu_x86_load_seg(env, R_ES, __USER_DS); |
| 702 |
cpu_x86_load_seg(env, R_SS, __USER_DS); |
| 703 |
cpu_x86_load_seg(env, R_CS, __USER_CS); |
| 704 |
env->eflags &= ~TF_MASK; |
| 705 |
|
| 706 |
return;
|
| 707 |
|
| 708 |
give_sigsegv:
|
| 709 |
if (sig == TARGET_SIGSEGV)
|
| 710 |
ka->sa._sa_handler = TARGET_SIG_DFL; |
| 711 |
force_sig(TARGET_SIGSEGV /* , current */);
|
| 712 |
} |
| 713 |
|
| 714 |
static int |
| 715 |
restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) |
| 716 |
{
|
| 717 |
unsigned int err = 0; |
| 718 |
|
| 719 |
|
| 720 |
|
| 721 |
#define COPY(x) err |= __get_user(regs->x, &sc->x)
|
| 722 |
|
| 723 |
#define COPY_SEG(seg) \
|
| 724 |
{ unsigned short tmp; \
|
| 725 |
err |= __get_user(tmp, &sc->seg); \ |
| 726 |
regs->x##seg = tmp; } |
| 727 |
|
| 728 |
#define COPY_SEG_STRICT(seg) \
|
| 729 |
{ unsigned short tmp; \
|
| 730 |
err |= __get_user(tmp, &sc->seg); \ |
| 731 |
regs->x##seg = tmp|3; } |
| 732 |
|
| 733 |
#define GET_SEG(seg) \
|
| 734 |
{ unsigned short tmp; \
|
| 735 |
err |= __get_user(tmp, &sc->seg); \ |
| 736 |
loadsegment(seg,tmp); } |
| 737 |
|
| 738 |
cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); |
| 739 |
cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); |
| 740 |
cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); |
| 741 |
cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); |
| 742 |
|
| 743 |
env->regs[R_EDI] = ldl(&sc->edi); |
| 744 |
env->regs[R_ESI] = ldl(&sc->esi); |
| 745 |
env->regs[R_EBP] = ldl(&sc->ebp); |
| 746 |
env->regs[R_ESP] = ldl(&sc->esp); |
| 747 |
env->regs[R_EBX] = ldl(&sc->ebx); |
| 748 |
env->regs[R_EDX] = ldl(&sc->edx); |
| 749 |
env->regs[R_ECX] = ldl(&sc->ecx); |
| 750 |
env->eip = ldl(&sc->eip); |
| 751 |
|
| 752 |
cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3);
|
| 753 |
cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3);
|
| 754 |
|
| 755 |
{
|
| 756 |
unsigned int tmpflags; |
| 757 |
tmpflags = ldl(&sc->eflags); |
| 758 |
env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); |
| 759 |
// regs->orig_eax = -1; /* disable syscall checks */
|
| 760 |
} |
| 761 |
|
| 762 |
#if 0
|
| 763 |
{
|
| 764 |
struct _fpstate * buf;
|
| 765 |
err |= __get_user(buf, &sc->fpstate);
|
| 766 |
if (buf) {
|
| 767 |
if (verify_area(VERIFY_READ, buf, sizeof(*buf)))
|
| 768 |
goto badframe;
|
| 769 |
err |= restore_i387(buf);
|
| 770 |
}
|
| 771 |
}
|
| 772 |
#endif
|
| 773 |
*peax = ldl(&sc->eax); |
| 774 |
return err;
|
| 775 |
#if 0
|
| 776 |
badframe:
|
| 777 |
return 1;
|
| 778 |
#endif
|
| 779 |
} |
| 780 |
|
| 781 |
long do_sigreturn(CPUX86State *env)
|
| 782 |
{
|
| 783 |
struct sigframe *frame = (struct sigframe *)(env->regs[R_ESP] - 8); |
| 784 |
target_sigset_t target_set; |
| 785 |
sigset_t set; |
| 786 |
int eax, i;
|
| 787 |
|
| 788 |
/* set blocked signals */
|
| 789 |
target_set.sig[0] = frame->sc.oldmask;
|
| 790 |
for(i = 1; i < TARGET_NSIG_WORDS; i++) |
| 791 |
target_set.sig[i] = frame->extramask[i - 1];
|
| 792 |
|
| 793 |
target_to_host_sigset(&set, &target_set); |
| 794 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 795 |
|
| 796 |
/* restore registers */
|
| 797 |
if (restore_sigcontext(env, &frame->sc, &eax))
|
| 798 |
goto badframe;
|
| 799 |
return eax;
|
| 800 |
|
| 801 |
badframe:
|
| 802 |
force_sig(TARGET_SIGSEGV); |
| 803 |
return 0; |
| 804 |
} |
| 805 |
|
| 806 |
long do_rt_sigreturn(CPUX86State *env)
|
| 807 |
{
|
| 808 |
struct rt_sigframe *frame = (struct rt_sigframe *)(env->regs[R_ESP] - 4); |
| 809 |
target_sigset_t target_set; |
| 810 |
sigset_t set; |
| 811 |
// stack_t st;
|
| 812 |
int eax;
|
| 813 |
|
| 814 |
#if 0
|
| 815 |
if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
|
| 816 |
goto badframe;
|
| 817 |
#endif
|
| 818 |
memcpy(&target_set, &frame->uc.uc_sigmask, sizeof(target_sigset_t));
|
| 819 |
|
| 820 |
target_to_host_sigset(&set, &target_set); |
| 821 |
sigprocmask(SIG_SETMASK, &set, NULL);
|
| 822 |
|
| 823 |
if (restore_sigcontext(env, &frame->uc.uc_mcontext, &eax))
|
| 824 |
goto badframe;
|
| 825 |
|
| 826 |
#if 0
|
| 827 |
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
|
| 828 |
goto badframe;
|
| 829 |
/* It is more difficult to avoid calling this function than to
|
| 830 |
call it and ignore errors. */
|
| 831 |
do_sigaltstack(&st, NULL, regs->esp);
|
| 832 |
#endif
|
| 833 |
return eax;
|
| 834 |
|
| 835 |
badframe:
|
| 836 |
force_sig(TARGET_SIGSEGV); |
| 837 |
return 0; |
| 838 |
} |
| 839 |
|
| 840 |
#endif
|
| 841 |
|
| 842 |
void process_pending_signals(void *cpu_env) |
| 843 |
{
|
| 844 |
int sig;
|
| 845 |
target_ulong handler; |
| 846 |
sigset_t set, old_set; |
| 847 |
target_sigset_t target_old_set; |
| 848 |
struct emulated_sigaction *k;
|
| 849 |
struct sigqueue *q;
|
| 850 |
|
| 851 |
if (!signal_pending)
|
| 852 |
return;
|
| 853 |
|
| 854 |
k = sigact_table; |
| 855 |
for(sig = 1; sig <= TARGET_NSIG; sig++) { |
| 856 |
if (k->pending)
|
| 857 |
goto handle_signal;
|
| 858 |
k++; |
| 859 |
} |
| 860 |
/* if no signal is pending, just return */
|
| 861 |
signal_pending = 0;
|
| 862 |
return;
|
| 863 |
|
| 864 |
handle_signal:
|
| 865 |
#ifdef DEBUG_SIGNAL
|
| 866 |
fprintf(stderr, "gemu: process signal %d\n", sig);
|
| 867 |
#endif
|
| 868 |
/* dequeue signal */
|
| 869 |
q = k->first; |
| 870 |
k->first = q->next; |
| 871 |
if (!k->first)
|
| 872 |
k->pending = 0;
|
| 873 |
|
| 874 |
handler = k->sa._sa_handler; |
| 875 |
if (handler == TARGET_SIG_DFL) {
|
| 876 |
/* default handler : ignore some signal. The other are fatal */
|
| 877 |
if (sig != TARGET_SIGCHLD &&
|
| 878 |
sig != TARGET_SIGURG && |
| 879 |
sig != TARGET_SIGWINCH) {
|
| 880 |
force_sig(sig); |
| 881 |
} |
| 882 |
} else if (handler == TARGET_SIG_IGN) { |
| 883 |
/* ignore sig */
|
| 884 |
} else if (handler == TARGET_SIG_ERR) { |
| 885 |
force_sig(sig); |
| 886 |
} else {
|
| 887 |
/* compute the blocked signals during the handler execution */
|
| 888 |
target_to_host_sigset(&set, &k->sa.sa_mask); |
| 889 |
/* SA_NODEFER indicates that the current signal should not be
|
| 890 |
blocked during the handler */
|
| 891 |
if (!(k->sa.sa_flags & TARGET_SA_NODEFER))
|
| 892 |
sigaddset(&set, target_to_host_signal(sig)); |
| 893 |
|
| 894 |
/* block signals in the handler using Linux */
|
| 895 |
sigprocmask(SIG_BLOCK, &set, &old_set); |
| 896 |
/* save the previous blocked signal state to restore it at the
|
| 897 |
end of the signal execution (see do_sigreturn) */
|
| 898 |
host_to_target_sigset(&target_old_set, &old_set); |
| 899 |
|
| 900 |
/* prepare the stack frame of the virtual CPU */
|
| 901 |
if (k->sa.sa_flags & TARGET_SA_SIGINFO)
|
| 902 |
setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); |
| 903 |
else
|
| 904 |
setup_frame(sig, k, &target_old_set, cpu_env); |
| 905 |
if (k->sa.sa_flags & TARGET_SA_RESETHAND)
|
| 906 |
k->sa._sa_handler = TARGET_SIG_DFL; |
| 907 |
} |
| 908 |
if (q != &k->info)
|
| 909 |
free_sigqueue(q); |
| 910 |
} |
| 911 |
|
| 912 |
|