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 <unistd.h> 25 #include <signal.h> 26 #include <errno.h> 27 #include <sys/ucontext.h> 28 29 #include "qemu.h" 30 #include "target_signal.h" 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 struct target_sigaltstack target_sigaltstack_used = { 50 .ss_sp = 0, 51 .ss_size = 0, 52 .ss_flags = TARGET_SS_DISABLE, 53 }; 54 55 static struct emulated_sigaction sigact_table[TARGET_NSIG]; 56 static struct sigqueue sigqueue_table[MAX_SIGQUEUE_SIZE]; /* siginfo queue */ 57 static struct sigqueue *first_free; /* first free siginfo queue entry */ 58 static int signal_pending; /* non zero if a signal may be pending */ 59 60 static void host_signal_handler(int host_signum, siginfo_t *info, 61 void *puc); 62 63 static uint8_t host_to_target_signal_table[65] = { 64 [SIGHUP] = TARGET_SIGHUP, 65 [SIGINT] = TARGET_SIGINT, 66 [SIGQUIT] = TARGET_SIGQUIT, 67 [SIGILL] = TARGET_SIGILL, 68 [SIGTRAP] = TARGET_SIGTRAP, 69 [SIGABRT] = TARGET_SIGABRT, 70 /* [SIGIOT] = TARGET_SIGIOT,*/ 71 [SIGBUS] = TARGET_SIGBUS, 72 [SIGFPE] = TARGET_SIGFPE, 73 [SIGKILL] = TARGET_SIGKILL, 74 [SIGUSR1] = TARGET_SIGUSR1, 75 [SIGSEGV] = TARGET_SIGSEGV, 76 [SIGUSR2] = TARGET_SIGUSR2, 77 [SIGPIPE] = TARGET_SIGPIPE, 78 [SIGALRM] = TARGET_SIGALRM, 79 [SIGTERM] = TARGET_SIGTERM, 80 #ifdef SIGSTKFLT 81 [SIGSTKFLT] = TARGET_SIGSTKFLT, 82 #endif 83 [SIGCHLD] = TARGET_SIGCHLD, 84 [SIGCONT] = TARGET_SIGCONT, 85 [SIGSTOP] = TARGET_SIGSTOP, 86 [SIGTSTP] = TARGET_SIGTSTP, 87 [SIGTTIN] = TARGET_SIGTTIN, 88 [SIGTTOU] = TARGET_SIGTTOU, 89 [SIGURG] = TARGET_SIGURG, 90 [SIGXCPU] = TARGET_SIGXCPU, 91 [SIGXFSZ] = TARGET_SIGXFSZ, 92 [SIGVTALRM] = TARGET_SIGVTALRM, 93 [SIGPROF] = TARGET_SIGPROF, 94 [SIGWINCH] = TARGET_SIGWINCH, 95 [SIGIO] = TARGET_SIGIO, 96 [SIGPWR] = TARGET_SIGPWR, 97 [SIGSYS] = TARGET_SIGSYS, 98 /* next signals stay the same */ 99 }; 100 static uint8_t target_to_host_signal_table[65]; 101 102 static inline int on_sig_stack(unsigned long sp) 103 { 104 return (sp - target_sigaltstack_used.ss_sp 105 < target_sigaltstack_used.ss_size); 106 } 107 108 static inline int sas_ss_flags(unsigned long sp) 109 { 110 return (target_sigaltstack_used.ss_size == 0 ? SS_DISABLE 111 : on_sig_stack(sp) ? SS_ONSTACK : 0); 112 } 113 114 static inline int host_to_target_signal(int sig) 115 { 116 return host_to_target_signal_table[sig]; 117 } 118 119 static inline int target_to_host_signal(int sig) 120 { 121 return target_to_host_signal_table[sig]; 122 } 123 124 static void host_to_target_sigset_internal(target_sigset_t *d, 125 const sigset_t *s) 126 { 127 int i; 128 unsigned long sigmask; 129 uint32_t target_sigmask; 130 131 sigmask = ((unsigned long *)s)[0]; 132 target_sigmask = 0; 133 for(i = 0; i < 32; i++) { 134 if (sigmask & (1 << i)) 135 target_sigmask |= 1 << (host_to_target_signal(i + 1) - 1); 136 } 137 #if TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 32 138 d->sig[0] = target_sigmask; 139 for(i = 1;i < TARGET_NSIG_WORDS; i++) { 140 d->sig[i] = ((unsigned long *)s)[i]; 141 } 142 #elif TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 143 d->sig[0] = target_sigmask; 144 d->sig[1] = sigmask >> 32; 145 #else 146 #warning host_to_target_sigset 147 #endif 148 } 149 150 void host_to_target_sigset(target_sigset_t *d, const sigset_t *s) 151 { 152 target_sigset_t d1; 153 int i; 154 155 host_to_target_sigset_internal(&d1, s); 156 for(i = 0;i < TARGET_NSIG_WORDS; i++) 157 d->sig[i] = tswapl(d1.sig[i]); 158 } 159 160 void target_to_host_sigset_internal(sigset_t *d, const target_sigset_t *s) 161 { 162 int i; 163 unsigned long sigmask; 164 abi_ulong target_sigmask; 165 166 target_sigmask = s->sig[0]; 167 sigmask = 0; 168 for(i = 0; i < 32; i++) { 169 if (target_sigmask & (1 << i)) 170 sigmask |= 1 << (target_to_host_signal(i + 1) - 1); 171 } 172 #if TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 32 173 ((unsigned long *)d)[0] = sigmask; 174 for(i = 1;i < TARGET_NSIG_WORDS; i++) { 175 ((unsigned long *)d)[i] = s->sig[i]; 176 } 177 #elif TARGET_ABI_BITS == 32 && HOST_LONG_BITS == 64 && TARGET_NSIG_WORDS == 2 178 ((unsigned long *)d)[0] = sigmask | ((unsigned long)(s->sig[1]) << 32); 179 #else 180 #warning target_to_host_sigset 181 #endif /* TARGET_ABI_BITS */ 182 } 183 184 void target_to_host_sigset(sigset_t *d, const target_sigset_t *s) 185 { 186 target_sigset_t s1; 187 int i; 188 189 for(i = 0;i < TARGET_NSIG_WORDS; i++) 190 s1.sig[i] = tswapl(s->sig[i]); 191 target_to_host_sigset_internal(d, &s1); 192 } 193 194 void host_to_target_old_sigset(abi_ulong *old_sigset, 195 const sigset_t *sigset) 196 { 197 target_sigset_t d; 198 host_to_target_sigset(&d, sigset); 199 *old_sigset = d.sig[0]; 200 } 201 202 void target_to_host_old_sigset(sigset_t *sigset, 203 const abi_ulong *old_sigset) 204 { 205 target_sigset_t d; 206 int i; 207 208 d.sig[0] = *old_sigset; 209 for(i = 1;i < TARGET_NSIG_WORDS; i++) 210 d.sig[i] = 0; 211 target_to_host_sigset(sigset, &d); 212 } 213 214 /* siginfo conversion */ 215 216 static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, 217 const siginfo_t *info) 218 { 219 int sig; 220 sig = host_to_target_signal(info->si_signo); 221 tinfo->si_signo = sig; 222 tinfo->si_errno = 0; 223 tinfo->si_code = 0; 224 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || 225 sig == SIGBUS || sig == SIGTRAP) { 226 /* should never come here, but who knows. The information for 227 the target is irrelevant */ 228 tinfo->_sifields._sigfault._addr = 0; 229 } else if (sig == SIGIO) { 230 tinfo->_sifields._sigpoll._fd = info->si_fd; 231 } else if (sig >= TARGET_SIGRTMIN) { 232 tinfo->_sifields._rt._pid = info->si_pid; 233 tinfo->_sifields._rt._uid = info->si_uid; 234 /* XXX: potential problem if 64 bit */ 235 tinfo->_sifields._rt._sigval.sival_ptr = 236 (abi_ulong)info->si_value.sival_ptr; 237 } 238 } 239 240 static void tswap_siginfo(target_siginfo_t *tinfo, 241 const target_siginfo_t *info) 242 { 243 int sig; 244 sig = info->si_signo; 245 tinfo->si_signo = tswap32(sig); 246 tinfo->si_errno = tswap32(info->si_errno); 247 tinfo->si_code = tswap32(info->si_code); 248 if (sig == SIGILL || sig == SIGFPE || sig == SIGSEGV || 249 sig == SIGBUS || sig == SIGTRAP) { 250 tinfo->_sifields._sigfault._addr = 251 tswapl(info->_sifields._sigfault._addr); 252 } else if (sig == SIGIO) { 253 tinfo->_sifields._sigpoll._fd = tswap32(info->_sifields._sigpoll._fd); 254 } else if (sig >= TARGET_SIGRTMIN) { 255 tinfo->_sifields._rt._pid = tswap32(info->_sifields._rt._pid); 256 tinfo->_sifields._rt._uid = tswap32(info->_sifields._rt._uid); 257 tinfo->_sifields._rt._sigval.sival_ptr = 258 tswapl(info->_sifields._rt._sigval.sival_ptr); 259 } 260 } 261 262 263 void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info) 264 { 265 host_to_target_siginfo_noswap(tinfo, info); 266 tswap_siginfo(tinfo, tinfo); 267 } 268 269 /* XXX: we support only POSIX RT signals are used. */ 270 /* XXX: find a solution for 64 bit (additional malloced data is needed) */ 271 void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo) 272 { 273 info->si_signo = tswap32(tinfo->si_signo); 274 info->si_errno = tswap32(tinfo->si_errno); 275 info->si_code = tswap32(tinfo->si_code); 276 info->si_pid = tswap32(tinfo->_sifields._rt._pid); 277 info->si_uid = tswap32(tinfo->_sifields._rt._uid); 278 info->si_value.sival_ptr = 279 (void *)tswapl(tinfo->_sifields._rt._sigval.sival_ptr); 280 } 281 282 void signal_init(void) 283 { 284 struct sigaction act; 285 int i, j; 286 287 /* generate signal conversion tables */ 288 for(i = 1; i <= 64; i++) { 289 if (host_to_target_signal_table[i] == 0) 290 host_to_target_signal_table[i] = i; 291 } 292 for(i = 1; i <= 64; i++) { 293 j = host_to_target_signal_table[i]; 294 target_to_host_signal_table[j] = i; 295 } 296 297 /* set all host signal handlers. ALL signals are blocked during 298 the handlers to serialize them. */ 299 sigfillset(&act.sa_mask); 300 act.sa_flags = SA_SIGINFO; 301 act.sa_sigaction = host_signal_handler; 302 for(i = 1; i < NSIG; i++) { 303 sigaction(i, &act, NULL); 304 } 305 306 memset(sigact_table, 0, sizeof(sigact_table)); 307 308 first_free = &sigqueue_table[0]; 309 for(i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) 310 sigqueue_table[i].next = &sigqueue_table[i + 1]; 311 sigqueue_table[MAX_SIGQUEUE_SIZE - 1].next = NULL; 312 } 313 314 /* signal queue handling */ 315 316 static inline struct sigqueue *alloc_sigqueue(void) 317 { 318 struct sigqueue *q = first_free; 319 if (!q) 320 return NULL; 321 first_free = q->next; 322 return q; 323 } 324 325 static inline void free_sigqueue(struct sigqueue *q) 326 { 327 q->next = first_free; 328 first_free = q; 329 } 330 331 /* abort execution with signal */ 332 void __attribute((noreturn)) force_sig(int sig) 333 { 334 int host_sig; 335 host_sig = target_to_host_signal(sig); 336 fprintf(stderr, "qemu: uncaught target signal %d (%s) - exiting\n", 337 sig, strsignal(host_sig)); 338 #if 1 339 _exit(-host_sig); 340 #else 341 { 342 struct sigaction act; 343 sigemptyset(&act.sa_mask); 344 act.sa_flags = SA_SIGINFO; 345 act.sa_sigaction = SIG_DFL; 346 sigaction(SIGABRT, &act, NULL); 347 abort(); 348 } 349 #endif 350 } 351 352 /* queue a signal so that it will be send to the virtual CPU as soon 353 as possible */ 354 int queue_signal(int sig, target_siginfo_t *info) 355 { 356 struct emulated_sigaction *k; 357 struct sigqueue *q, **pq; 358 abi_ulong handler; 359 360 #if defined(DEBUG_SIGNAL) 361 fprintf(stderr, "queue_signal: sig=%d\n", 362 sig); 363 #endif 364 k = &sigact_table[sig - 1]; 365 handler = k->sa._sa_handler; 366 if (handler == TARGET_SIG_DFL) { 367 /* default handler : ignore some signal. The other are fatal */ 368 if (sig != TARGET_SIGCHLD && 369 sig != TARGET_SIGURG && 370 sig != TARGET_SIGWINCH) { 371 force_sig(sig); 372 } else { 373 return 0; /* indicate ignored */ 374 } 375 } else if (handler == TARGET_SIG_IGN) { 376 /* ignore signal */ 377 return 0; 378 } else if (handler == TARGET_SIG_ERR) { 379 force_sig(sig); 380 } else { 381 pq = &k->first; 382 if (sig < TARGET_SIGRTMIN) { 383 /* if non real time signal, we queue exactly one signal */ 384 if (!k->pending) 385 q = &k->info; 386 else 387 return 0; 388 } else { 389 if (!k->pending) { 390 /* first signal */ 391 q = &k->info; 392 } else { 393 q = alloc_sigqueue(); 394 if (!q) 395 return -EAGAIN; 396 while (*pq != NULL) 397 pq = &(*pq)->next; 398 } 399 } 400 *pq = q; 401 q->info = *info; 402 q->next = NULL; 403 k->pending = 1; 404 /* signal that a new signal is pending */ 405 signal_pending = 1; 406 return 1; /* indicates that the signal was queued */ 407 } 408 } 409 410 static void host_signal_handler(int host_signum, siginfo_t *info, 411 void *puc) 412 { 413 int sig; 414 target_siginfo_t tinfo; 415 416 /* the CPU emulator uses some host signals to detect exceptions, 417 we we forward to it some signals */ 418 if (host_signum == SIGSEGV || host_signum == SIGBUS) { 419 if (cpu_signal_handler(host_signum, info, puc)) 420 return; 421 } 422 423 /* get target signal number */ 424 sig = host_to_target_signal(host_signum); 425 if (sig < 1 || sig > TARGET_NSIG) 426 return; 427 #if defined(DEBUG_SIGNAL) 428 fprintf(stderr, "qemu: got signal %d\n", sig); 429 #endif 430 host_to_target_siginfo_noswap(&tinfo, info); 431 if (queue_signal(sig, &tinfo) == 1) { 432 /* interrupt the virtual CPU as soon as possible */ 433 cpu_interrupt(global_env, CPU_INTERRUPT_EXIT); 434 } 435 } 436 437 /* do_sigaltstack() returns target values and errnos. */ 438 /* compare linux/kernel/signal.c:do_sigaltstack() */ 439 abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr, abi_ulong sp) 440 { 441 int ret; 442 struct target_sigaltstack oss; 443 444 /* XXX: test errors */ 445 if(uoss_addr) 446 { 447 __put_user(target_sigaltstack_used.ss_sp, &oss.ss_sp); 448 __put_user(target_sigaltstack_used.ss_size, &oss.ss_size); 449 __put_user(sas_ss_flags(sp), &oss.ss_flags); 450 } 451 452 if(uss_addr) 453 { 454 struct target_sigaltstack *uss; 455 struct target_sigaltstack ss; 456 457 ret = -TARGET_EFAULT; 458 if (!lock_user_struct(VERIFY_READ, uss, uss_addr, 1) 459 || __get_user(ss.ss_sp, &uss->ss_sp) 460 || __get_user(ss.ss_size, &uss->ss_size) 461 || __get_user(ss.ss_flags, &uss->ss_flags)) 462 goto out; 463 unlock_user_struct(uss, uss_addr, 0); 464 465 ret = -TARGET_EPERM; 466 if (on_sig_stack(sp)) 467 goto out; 468 469 ret = -TARGET_EINVAL; 470 if (ss.ss_flags != TARGET_SS_DISABLE 471 && ss.ss_flags != TARGET_SS_ONSTACK 472 && ss.ss_flags != 0) 473 goto out; 474 475 if (ss.ss_flags == TARGET_SS_DISABLE) { 476 ss.ss_size = 0; 477 ss.ss_sp = 0; 478 } else { 479 ret = -TARGET_ENOMEM; 480 if (ss.ss_size < MINSIGSTKSZ) 481 goto out; 482 } 483 484 target_sigaltstack_used.ss_sp = ss.ss_sp; 485 target_sigaltstack_used.ss_size = ss.ss_size; 486 } 487 488 if (uoss_addr) { 489 ret = -TARGET_EFAULT; 490 if (copy_to_user(uoss_addr, &oss, sizeof(oss))) 491 goto out; 492 } 493 494 ret = 0; 495 out: 496 return ret; 497 } 498 499 /* do_sigaction() return host values and errnos */ 500 int do_sigaction(int sig, const struct target_sigaction *act, 501 struct target_sigaction *oact) 502 { 503 struct emulated_sigaction *k; 504 struct sigaction act1; 505 int host_sig; 506 int ret = 0; 507 508 if (sig < 1 || sig > TARGET_NSIG || sig == SIGKILL || sig == SIGSTOP) 509 return -EINVAL; 510 k = &sigact_table[sig - 1]; 511 #if defined(DEBUG_SIGNAL) 512 fprintf(stderr, "sigaction sig=%d act=0x%08x, oact=0x%08x\n", 513 sig, (int)act, (int)oact); 514 #endif 515 if (oact) { 516 oact->_sa_handler = tswapl(k->sa._sa_handler); 517 oact->sa_flags = tswapl(k->sa.sa_flags); 518 #if !defined(TARGET_MIPS) 519 oact->sa_restorer = tswapl(k->sa.sa_restorer); 520 #endif 521 oact->sa_mask = k->sa.sa_mask; 522 } 523 if (act) { 524 k->sa._sa_handler = tswapl(act->_sa_handler); 525 k->sa.sa_flags = tswapl(act->sa_flags); 526 #if !defined(TARGET_MIPS) 527 k->sa.sa_restorer = tswapl(act->sa_restorer); 528 #endif 529 k->sa.sa_mask = act->sa_mask; 530 531 /* we update the host linux signal state */ 532 host_sig = target_to_host_signal(sig); 533 if (host_sig != SIGSEGV && host_sig != SIGBUS) { 534 sigfillset(&act1.sa_mask); 535 act1.sa_flags = SA_SIGINFO; 536 if (k->sa.sa_flags & TARGET_SA_RESTART) 537 act1.sa_flags |= SA_RESTART; 538 /* NOTE: it is important to update the host kernel signal 539 ignore state to avoid getting unexpected interrupted 540 syscalls */ 541 if (k->sa._sa_handler == TARGET_SIG_IGN) { 542 act1.sa_sigaction = (void *)SIG_IGN; 543 } else if (k->sa._sa_handler == TARGET_SIG_DFL) { 544 act1.sa_sigaction = (void *)SIG_DFL; 545 } else { 546 act1.sa_sigaction = host_signal_handler; 547 } 548 ret = sigaction(host_sig, &act1, NULL); 549 } 550 } 551 return ret; 552 } 553 554 #ifndef offsetof 555 #define offsetof(type, field) ((size_t) &((type *)0)->field) 556 #endif 557 558 static inline int copy_siginfo_to_user(target_siginfo_t *tinfo, 559 const target_siginfo_t *info) 560 { 561 tswap_siginfo(tinfo, info); 562 return 0; 563 } 564 565 #ifdef TARGET_I386 566 567 /* from the Linux kernel */ 568 569 struct target_fpreg { 570 uint16_t significand[4]; 571 uint16_t exponent; 572 }; 573 574 struct target_fpxreg { 575 uint16_t significand[4]; 576 uint16_t exponent; 577 uint16_t padding[3]; 578 }; 579 580 struct target_xmmreg { 581 abi_ulong element[4]; 582 }; 583 584 struct target_fpstate { 585 /* Regular FPU environment */ 586 abi_ulong cw; 587 abi_ulong sw; 588 abi_ulong tag; 589 abi_ulong ipoff; 590 abi_ulong cssel; 591 abi_ulong dataoff; 592 abi_ulong datasel; 593 struct target_fpreg _st[8]; 594 uint16_t status; 595 uint16_t magic; /* 0xffff = regular FPU data only */ 596 597 /* FXSR FPU environment */ 598 abi_ulong _fxsr_env[6]; /* FXSR FPU env is ignored */ 599 abi_ulong mxcsr; 600 abi_ulong reserved; 601 struct target_fpxreg _fxsr_st[8]; /* FXSR FPU reg data is ignored */ 602 struct target_xmmreg _xmm[8]; 603 abi_ulong padding[56]; 604 }; 605 606 #define X86_FXSR_MAGIC 0x0000 607 608 struct target_sigcontext { 609 uint16_t gs, __gsh; 610 uint16_t fs, __fsh; 611 uint16_t es, __esh; 612 uint16_t ds, __dsh; 613 abi_ulong edi; 614 abi_ulong esi; 615 abi_ulong ebp; 616 abi_ulong esp; 617 abi_ulong ebx; 618 abi_ulong edx; 619 abi_ulong ecx; 620 abi_ulong eax; 621 abi_ulong trapno; 622 abi_ulong err; 623 abi_ulong eip; 624 uint16_t cs, __csh; 625 abi_ulong eflags; 626 abi_ulong esp_at_signal; 627 uint16_t ss, __ssh; 628 abi_ulong fpstate; /* pointer */ 629 abi_ulong oldmask; 630 abi_ulong cr2; 631 }; 632 633 struct target_ucontext { 634 abi_ulong tuc_flags; 635 abi_ulong tuc_link; 636 target_stack_t tuc_stack; 637 struct target_sigcontext tuc_mcontext; 638 target_sigset_t tuc_sigmask; /* mask last for extensibility */ 639 }; 640 641 struct sigframe 642 { 643 abi_ulong pretcode; 644 int sig; 645 struct target_sigcontext sc; 646 struct target_fpstate fpstate; 647 abi_ulong extramask[TARGET_NSIG_WORDS-1]; 648 char retcode[8]; 649 }; 650 651 struct rt_sigframe 652 { 653 abi_ulong pretcode; 654 int sig; 655 abi_ulong pinfo; 656 abi_ulong puc; 657 struct target_siginfo info; 658 struct target_ucontext uc; 659 struct target_fpstate fpstate; 660 char retcode[8]; 661 }; 662 663 /* 664 * Set up a signal frame. 665 */ 666 667 /* XXX: save x87 state */ 668 static int 669 setup_sigcontext(struct target_sigcontext *sc, struct target_fpstate *fpstate, 670 CPUX86State *env, unsigned long mask) 671 { 672 int err = 0; 673 uint16_t magic; 674 675 /* already locked in setup_frame() */ 676 err |= __put_user(env->segs[R_GS].selector, (unsigned int *)&sc->gs); 677 err |= __put_user(env->segs[R_FS].selector, (unsigned int *)&sc->fs); 678 err |= __put_user(env->segs[R_ES].selector, (unsigned int *)&sc->es); 679 err |= __put_user(env->segs[R_DS].selector, (unsigned int *)&sc->ds); 680 err |= __put_user(env->regs[R_EDI], &sc->edi); 681 err |= __put_user(env->regs[R_ESI], &sc->esi); 682 err |= __put_user(env->regs[R_EBP], &sc->ebp); 683 err |= __put_user(env->regs[R_ESP], &sc->esp); 684 err |= __put_user(env->regs[R_EBX], &sc->ebx); 685 err |= __put_user(env->regs[R_EDX], &sc->edx); 686 err |= __put_user(env->regs[R_ECX], &sc->ecx); 687 err |= __put_user(env->regs[R_EAX], &sc->eax); 688 err |= __put_user(env->exception_index, &sc->trapno); 689 err |= __put_user(env->error_code, &sc->err); 690 err |= __put_user(env->eip, &sc->eip); 691 err |= __put_user(env->segs[R_CS].selector, (unsigned int *)&sc->cs); 692 err |= __put_user(env->eflags, &sc->eflags); 693 err |= __put_user(env->regs[R_ESP], &sc->esp_at_signal); 694 err |= __put_user(env->segs[R_SS].selector, (unsigned int *)&sc->ss); 695 696 cpu_x86_fsave(env, (void *)fpstate, 1); 697 fpstate->status = fpstate->sw; 698 magic = 0xffff; 699 err |= __put_user(magic, &fpstate->magic); 700 err |= __put_user(fpstate, &sc->fpstate); 701 702 /* non-iBCS2 extensions.. */ 703 err |= __put_user(mask, &sc->oldmask); 704 err |= __put_user(env->cr[2], &sc->cr2); 705 return err; 706 } 707 708 /* 709 * Determine which stack to use.. 710 */ 711 712 static inline abi_ulong 713 get_sigframe(struct emulated_sigaction *ka, CPUX86State *env, size_t frame_size) 714 { 715 unsigned long esp; 716 717 /* Default to using normal stack */ 718 esp = env->regs[R_ESP]; 719 /* This is the X/Open sanctioned signal stack switching. */ 720 if (ka->sa.sa_flags & TARGET_SA_ONSTACK) { 721 if (sas_ss_flags(esp) == 0) 722 esp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; 723 } 724 725 /* This is the legacy signal stack switching. */ 726 else 727 if ((env->segs[R_SS].selector & 0xffff) != __USER_DS && 728 !(ka->sa.sa_flags & TARGET_SA_RESTORER) && 729 ka->sa.sa_restorer) { 730 esp = (unsigned long) ka->sa.sa_restorer; 731 } 732 return (esp - frame_size) & -8ul; 733 } 734 735 /* compare linux/arch/i386/kernel/signal.c:setup_frame() */ 736 static void setup_frame(int sig, struct emulated_sigaction *ka, 737 target_sigset_t *set, CPUX86State *env) 738 { 739 abi_ulong frame_addr; 740 struct sigframe *frame; 741 int i, err = 0; 742 743 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 744 745 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) 746 goto give_sigsegv; 747 748 err |= __put_user((/*current->exec_domain 749 && current->exec_domain->signal_invmap 750 && sig < 32 751 ? current->exec_domain->signal_invmap[sig] 752 : */ sig), 753 &frame->sig); 754 if (err) 755 goto give_sigsegv; 756 757 setup_sigcontext(&frame->sc, &frame->fpstate, env, set->sig[0]); 758 if (err) 759 goto give_sigsegv; 760 761 for(i = 1; i < TARGET_NSIG_WORDS; i++) { 762 if (__put_user(set->sig[i], &frame->extramask[i - 1])) 763 goto give_sigsegv; 764 } 765 766 /* Set up to return from userspace. If provided, use a stub 767 already in userspace. */ 768 if (ka->sa.sa_flags & TARGET_SA_RESTORER) { 769 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); 770 } else { 771 uint16_t val16; 772 err |= __put_user(frame->retcode, &frame->pretcode); 773 /* This is popl %eax ; movl $,%eax ; int $0x80 */ 774 val16 = 0xb858; 775 err |= __put_user(val16, (uint16_t *)(frame->retcode+0)); 776 #if defined(TARGET_X86_64) 777 #warning "Fix this !" 778 #else 779 err |= __put_user(TARGET_NR_sigreturn, (int *)(frame->retcode+2)); 780 #endif 781 val16 = 0x80cd; 782 err |= __put_user(val16, (uint16_t *)(frame->retcode+6)); 783 } 784 785 if (err) 786 goto give_sigsegv; 787 788 /* Set up registers for signal handler */ 789 env->regs[R_ESP] = h2g(frame); 790 env->eip = (unsigned long) ka->sa._sa_handler; 791 792 cpu_x86_load_seg(env, R_DS, __USER_DS); 793 cpu_x86_load_seg(env, R_ES, __USER_DS); 794 cpu_x86_load_seg(env, R_SS, __USER_DS); 795 cpu_x86_load_seg(env, R_CS, __USER_CS); 796 env->eflags &= ~TF_MASK; 797 798 unlock_user_struct(frame, frame_addr, 1); 799 800 return; 801 802 give_sigsegv: 803 unlock_user_struct(frame, frame_addr, 1); 804 if (sig == TARGET_SIGSEGV) 805 ka->sa._sa_handler = TARGET_SIG_DFL; 806 force_sig(TARGET_SIGSEGV /* , current */); 807 } 808 809 /* compare linux/arch/i386/kernel/signal.c:setup_rt_frame() */ 810 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 811 target_siginfo_t *info, 812 target_sigset_t *set, CPUX86State *env) 813 { 814 abi_ulong frame_addr; 815 struct rt_sigframe *frame; 816 int i, err = 0; 817 818 frame_addr = get_sigframe(ka, env, sizeof(*frame)); 819 820 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) 821 goto give_sigsegv; 822 823 err |= __put_user((/*current->exec_domain 824 && current->exec_domain->signal_invmap 825 && sig < 32 826 ? current->exec_domain->signal_invmap[sig] 827 : */sig), 828 &frame->sig); 829 err |= __put_user((abi_ulong)&frame->info, &frame->pinfo); 830 err |= __put_user((abi_ulong)&frame->uc, &frame->puc); 831 err |= copy_siginfo_to_user(&frame->info, info); 832 if (err) 833 goto give_sigsegv; 834 835 /* Create the ucontext. */ 836 err |= __put_user(0, &frame->uc.tuc_flags); 837 err |= __put_user(0, &frame->uc.tuc_link); 838 err |= __put_user(target_sigaltstack_used.ss_sp, 839 &frame->uc.tuc_stack.ss_sp); 840 err |= __put_user(sas_ss_flags(get_sp_from_cpustate(env)), 841 &frame->uc.tuc_stack.ss_flags); 842 err |= __put_user(target_sigaltstack_used.ss_size, 843 &frame->uc.tuc_stack.ss_size); 844 err |= setup_sigcontext(&frame->uc.tuc_mcontext, &frame->fpstate, 845 env, set->sig[0]); 846 for(i = 0; i < TARGET_NSIG_WORDS; i++) { 847 if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i])) 848 goto give_sigsegv; 849 } 850 851 /* Set up to return from userspace. If provided, use a stub 852 already in userspace. */ 853 if (ka->sa.sa_flags & TARGET_SA_RESTORER) { 854 err |= __put_user(ka->sa.sa_restorer, &frame->pretcode); 855 } else { 856 uint16_t val16; 857 858 err |= __put_user(frame->retcode, &frame->pretcode); 859 /* This is movl $,%eax ; int $0x80 */ 860 err |= __put_user(0xb8, (char *)(frame->retcode+0)); 861 err |= __put_user(TARGET_NR_rt_sigreturn, (int *)(frame->retcode+1)); 862 val16 = 0x80cd; 863 err |= __put_user(val16, (uint16_t *)(frame->retcode+5)); 864 } 865 866 if (err) 867 goto give_sigsegv; 868 869 /* Set up registers for signal handler */ 870 env->regs[R_ESP] = (unsigned long) frame; 871 env->eip = (unsigned long) ka->sa._sa_handler; 872 873 cpu_x86_load_seg(env, R_DS, __USER_DS); 874 cpu_x86_load_seg(env, R_ES, __USER_DS); 875 cpu_x86_load_seg(env, R_SS, __USER_DS); 876 cpu_x86_load_seg(env, R_CS, __USER_CS); 877 env->eflags &= ~TF_MASK; 878 879 unlock_user_struct(frame, frame_addr, 1); 880 881 return; 882 883 give_sigsegv: 884 unlock_user_struct(frame, frame_addr, 1); 885 if (sig == TARGET_SIGSEGV) 886 ka->sa._sa_handler = TARGET_SIG_DFL; 887 force_sig(TARGET_SIGSEGV /* , current */); 888 } 889 890 static int 891 restore_sigcontext(CPUX86State *env, struct target_sigcontext *sc, int *peax) 892 { 893 unsigned int err = 0; 894 895 cpu_x86_load_seg(env, R_GS, lduw(&sc->gs)); 896 cpu_x86_load_seg(env, R_FS, lduw(&sc->fs)); 897 cpu_x86_load_seg(env, R_ES, lduw(&sc->es)); 898 cpu_x86_load_seg(env, R_DS, lduw(&sc->ds)); 899 900 env->regs[R_EDI] = ldl(&sc->edi); 901 env->regs[R_ESI] = ldl(&sc->esi); 902 env->regs[R_EBP] = ldl(&sc->ebp); 903 env->regs[R_ESP] = ldl(&sc->esp); 904 env->regs[R_EBX] = ldl(&sc->ebx); 905 env->regs[R_EDX] = ldl(&sc->edx); 906 env->regs[R_ECX] = ldl(&sc->ecx); 907 env->eip = ldl(&sc->eip); 908 909 cpu_x86_load_seg(env, R_CS, lduw(&sc->cs) | 3); 910 cpu_x86_load_seg(env, R_SS, lduw(&sc->ss) | 3); 911 912 { 913 unsigned int tmpflags; 914 tmpflags = ldl(&sc->eflags); 915 env->eflags = (env->eflags & ~0x40DD5) | (tmpflags & 0x40DD5); 916 // regs->orig_eax = -1; /* disable syscall checks */ 917 } 918 919 { 920 struct _fpstate * buf; 921 buf = (void *)ldl(&sc->fpstate); 922 if (buf) { 923 #if 0 924 if (verify_area(VERIFY_READ, buf, sizeof(*buf))) 925 goto badframe; 926 #endif 927 cpu_x86_frstor(env, (void *)buf, 1); 928 } 929 } 930 931 *peax = ldl(&sc->eax); 932 return err; 933 #if 0 934 badframe: 935 return 1; 936 #endif 937 } 938 939 long do_sigreturn(CPUX86State *env) 940 { 941 struct sigframe *frame; 942 abi_ulong frame_addr = env->regs[R_ESP] - 8; 943 target_sigset_t target_set; 944 sigset_t set; 945 int eax, i; 946 947 #if defined(DEBUG_SIGNAL) 948 fprintf(stderr, "do_sigreturn\n"); 949 #endif 950 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) 951 goto badframe; 952 /* set blocked signals */ 953 if (__get_user(target_set.sig[0], &frame->sc.oldmask)) 954 goto badframe; 955 for(i = 1; i < TARGET_NSIG_WORDS; i++) { 956 if (__get_user(target_set.sig[i], &frame->extramask[i - 1])) 957 goto badframe; 958 } 959 960 target_to_host_sigset_internal(&set, &target_set); 961 sigprocmask(SIG_SETMASK, &set, NULL); 962 963 /* restore registers */ 964 if (restore_sigcontext(env, &frame->sc, &eax)) 965 goto badframe; 966 unlock_user_struct(frame, frame_addr, 0); 967 return eax; 968 969 badframe: 970 unlock_user_struct(frame, frame_addr, 0); 971 force_sig(TARGET_SIGSEGV); 972 return 0; 973 } 974 975 long do_rt_sigreturn(CPUX86State *env) 976 { 977 struct rt_sigframe *frame = (struct rt_sigframe *)g2h(env->regs[R_ESP] - 4); 978 sigset_t set; 979 int eax; 980 981 #if 0 982 if (verify_area(VERIFY_READ, frame, sizeof(*frame))) 983 goto badframe; 984 #endif 985 target_to_host_sigset(&set, &frame->uc.tuc_sigmask); 986 sigprocmask(SIG_SETMASK, &set, NULL); 987 988 if (restore_sigcontext(env, &frame->uc.tuc_mcontext, &eax)) 989 goto badframe; 990 991 if (do_sigaltstack(h2g(&frame->uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) 992 goto badframe; 993 994 return eax; 995 996 badframe: 997 force_sig(TARGET_SIGSEGV); 998 return 0; 999 } 1000 1001 #elif defined(TARGET_ARM) 1002 1003 struct target_sigcontext { 1004 abi_ulong trap_no; 1005 abi_ulong error_code; 1006 abi_ulong oldmask; 1007 abi_ulong arm_r0; 1008 abi_ulong arm_r1; 1009 abi_ulong arm_r2; 1010 abi_ulong arm_r3; 1011 abi_ulong arm_r4; 1012 abi_ulong arm_r5; 1013 abi_ulong arm_r6; 1014 abi_ulong arm_r7; 1015 abi_ulong arm_r8; 1016 abi_ulong arm_r9; 1017 abi_ulong arm_r10; 1018 abi_ulong arm_fp; 1019 abi_ulong arm_ip; 1020 abi_ulong arm_sp; 1021 abi_ulong arm_lr; 1022 abi_ulong arm_pc; 1023 abi_ulong arm_cpsr; 1024 abi_ulong fault_address; 1025 }; 1026 1027 struct target_ucontext { 1028 abi_ulong tuc_flags; 1029 abi_ulong tuc_link; 1030 target_stack_t tuc_stack; 1031 struct target_sigcontext tuc_mcontext; 1032 target_sigset_t tuc_sigmask; /* mask last for extensibility */ 1033 }; 1034 1035 struct sigframe 1036 { 1037 struct target_sigcontext sc; 1038 abi_ulong extramask[TARGET_NSIG_WORDS-1]; 1039 abi_ulong retcode; 1040 }; 1041 1042 struct rt_sigframe 1043 { 1044 struct target_siginfo *pinfo; 1045 void *puc; 1046 struct target_siginfo info; 1047 struct target_ucontext uc; 1048 abi_ulong retcode; 1049 }; 1050 1051 #define TARGET_CONFIG_CPU_32 1 1052 1053 /* 1054 * For ARM syscalls, we encode the syscall number into the instruction. 1055 */ 1056 #define SWI_SYS_SIGRETURN (0xef000000|(TARGET_NR_sigreturn + ARM_SYSCALL_BASE)) 1057 #define SWI_SYS_RT_SIGRETURN (0xef000000|(TARGET_NR_rt_sigreturn + ARM_SYSCALL_BASE)) 1058 1059 /* 1060 * For Thumb syscalls, we pass the syscall number via r7. We therefore 1061 * need two 16-bit instructions. 1062 */ 1063 #define SWI_THUMB_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_sigreturn)) 1064 #define SWI_THUMB_RT_SIGRETURN (0xdf00 << 16 | 0x2700 | (TARGET_NR_rt_sigreturn)) 1065 1066 static const abi_ulong retcodes[4] = { 1067 SWI_SYS_SIGRETURN, SWI_THUMB_SIGRETURN, 1068 SWI_SYS_RT_SIGRETURN, SWI_THUMB_RT_SIGRETURN 1069 }; 1070 1071 1072 #define __put_user_error(x,p,e) __put_user(x, p) 1073 #define __get_user_error(x,p,e) __get_user(x, p) 1074 1075 static inline int valid_user_regs(CPUState *regs) 1076 { 1077 return 1; 1078 } 1079 1080 static int 1081 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ 1082 CPUState *env, unsigned long mask) 1083 { 1084 int err = 0; 1085 1086 __put_user_error(env->regs[0], &sc->arm_r0, err); 1087 __put_user_error(env->regs[1], &sc->arm_r1, err); 1088 __put_user_error(env->regs[2], &sc->arm_r2, err); 1089 __put_user_error(env->regs[3], &sc->arm_r3, err); 1090 __put_user_error(env->regs[4], &sc->arm_r4, err); 1091 __put_user_error(env->regs[5], &sc->arm_r5, err); 1092 __put_user_error(env->regs[6], &sc->arm_r6, err); 1093 __put_user_error(env->regs[7], &sc->arm_r7, err); 1094 __put_user_error(env->regs[8], &sc->arm_r8, err); 1095 __put_user_error(env->regs[9], &sc->arm_r9, err); 1096 __put_user_error(env->regs[10], &sc->arm_r10, err); 1097 __put_user_error(env->regs[11], &sc->arm_fp, err); 1098 __put_user_error(env->regs[12], &sc->arm_ip, err); 1099 __put_user_error(env->regs[13], &sc->arm_sp, err); 1100 __put_user_error(env->regs[14], &sc->arm_lr, err); 1101 __put_user_error(env->regs[15], &sc->arm_pc, err); 1102 #ifdef TARGET_CONFIG_CPU_32 1103 __put_user_error(cpsr_read(env), &sc->arm_cpsr, err); 1104 #endif 1105 1106 __put_user_error(/* current->thread.trap_no */ 0, &sc->trap_no, err); 1107 __put_user_error(/* current->thread.error_code */ 0, &sc->error_code, err); 1108 __put_user_error(/* current->thread.address */ 0, &sc->fault_address, err); 1109 __put_user_error(mask, &sc->oldmask, err); 1110 1111 return err; 1112 } 1113 1114 static inline abi_ulong 1115 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, int framesize) 1116 { 1117 unsigned long sp = regs->regs[13]; 1118 1119 /* 1120 * This is the X/Open sanctioned signal stack switching. 1121 */ 1122 if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) 1123 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; 1124 /* 1125 * ATPCS B01 mandates 8-byte alignment 1126 */ 1127 return (sp - framesize) & ~7; 1128 } 1129 1130 static int 1131 setup_return(CPUState *env, struct emulated_sigaction *ka, 1132 abi_ulong *rc, void *frame, int usig) 1133 { 1134 abi_ulong handler = (abi_ulong)ka->sa._sa_handler; 1135 abi_ulong retcode; 1136 int thumb = 0; 1137 #if defined(TARGET_CONFIG_CPU_32) 1138 #if 0 1139 abi_ulong cpsr = env->cpsr; 1140 1141 /* 1142 * Maybe we need to deliver a 32-bit signal to a 26-bit task. 1143 */ 1144 if (ka->sa.sa_flags & SA_THIRTYTWO) 1145 cpsr = (cpsr & ~MODE_MASK) | USR_MODE; 1146 1147 #ifdef CONFIG_ARM_THUMB 1148 if (elf_hwcap & HWCAP_THUMB) { 1149 /* 1150 * The LSB of the handler determines if we're going to 1151 * be using THUMB or ARM mode for this signal handler. 1152 */ 1153 thumb = handler & 1; 1154 1155 if (thumb) 1156 cpsr |= T_BIT; 1157 else 1158 cpsr &= ~T_BIT; 1159 } 1160 #endif /* CONFIG_ARM_THUMB */ 1161 #endif /* 0 */ 1162 #endif /* TARGET_CONFIG_CPU_32 */ 1163 1164 if (ka->sa.sa_flags & TARGET_SA_RESTORER) { 1165 retcode = (abi_ulong)ka->sa.sa_restorer; 1166 } else { 1167 unsigned int idx = thumb; 1168 1169 if (ka->sa.sa_flags & TARGET_SA_SIGINFO) 1170 idx += 2; 1171 1172 if (__put_user(retcodes[idx], rc)) 1173 return 1; 1174 #if 0 1175 flush_icache_range((abi_ulong)rc, 1176 (abi_ulong)(rc + 1)); 1177 #endif 1178 retcode = ((abi_ulong)rc) + thumb; 1179 } 1180 1181 env->regs[0] = usig; 1182 env->regs[13] = h2g(frame); 1183 env->regs[14] = retcode; 1184 env->regs[15] = handler & (thumb ? ~1 : ~3); 1185 1186 #if 0 1187 #ifdef TARGET_CONFIG_CPU_32 1188 env->cpsr = cpsr; 1189 #endif 1190 #endif 1191 1192 return 0; 1193 } 1194 1195 /* compare linux/arch/arm/kernel/signal.c:setup_frame() */ 1196 static void setup_frame(int usig, struct emulated_sigaction *ka, 1197 target_sigset_t *set, CPUState *regs) 1198 { 1199 struct sigframe *frame; 1200 abi_ulong frame_addr = get_sigframe(ka, regs, sizeof(*frame)); 1201 int i, err = 0; 1202 1203 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) 1204 return; 1205 1206 err |= setup_sigcontext(&frame->sc, /*&frame->fpstate,*/ regs, set->sig[0]); 1207 1208 for(i = 1; i < TARGET_NSIG_WORDS; i++) { 1209 if (__put_user(set->sig[i], &frame->extramask[i - 1])) 1210 goto end; 1211 } 1212 1213 if (err == 0) 1214 err = setup_return(regs, ka, &frame->retcode, frame, usig); 1215 1216 end: 1217 unlock_user_struct(frame, frame_addr, 1); 1218 // return err; 1219 } 1220 1221 /* compare linux/arch/arm/kernel/signal.c:setup_rt_frame() */ 1222 static void setup_rt_frame(int usig, struct emulated_sigaction *ka, 1223 target_siginfo_t *info, 1224 target_sigset_t *set, CPUState *env) 1225 { 1226 struct rt_sigframe *frame; 1227 abi_ulong frame_addr = get_sigframe(ka, env, sizeof(*frame)); 1228 struct target_sigaltstack stack; 1229 int i, err = 0; 1230 1231 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) 1232 return /* 1 */; 1233 1234 __put_user_error(&frame->info, (abi_ulong *)&frame->pinfo, err); 1235 __put_user_error(&frame->uc, (abi_ulong *)&frame->puc, err); 1236 err |= copy_siginfo_to_user(&frame->info, info); 1237 1238 /* Clear all the bits of the ucontext we don't use. */ 1239 memset(&frame->uc, 0, offsetof(struct target_ucontext, tuc_mcontext)); 1240 1241 memset(&stack, 0, sizeof(stack)); 1242 __put_user(target_sigaltstack_used.ss_sp, &stack.ss_sp); 1243 __put_user(target_sigaltstack_used.ss_size, &stack.ss_size); 1244 __put_user(sas_ss_flags(get_sp_from_cpustate(env)), &stack.ss_flags); 1245 memcpy(&frame->uc.tuc_stack, &stack, sizeof(stack)); 1246 1247 err |= setup_sigcontext(&frame->uc.tuc_mcontext, /*&frame->fpstate,*/ 1248 env, set->sig[0]); 1249 for(i = 0; i < TARGET_NSIG_WORDS; i++) { 1250 if (__put_user(set->sig[i], &frame->uc.tuc_sigmask.sig[i])) 1251 goto end; 1252 } 1253 1254 if (err == 0) 1255 err = setup_return(env, ka, &frame->retcode, frame, usig); 1256 1257 if (err == 0) { 1258 /* 1259 * For realtime signals we must also set the second and third 1260 * arguments for the signal handler. 1261 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06 1262 */ 1263 env->regs[1] = (abi_ulong)frame->pinfo; 1264 env->regs[2] = (abi_ulong)frame->puc; 1265 } 1266 1267 end: 1268 unlock_user_struct(frame, frame_addr, 1); 1269 1270 // return err; 1271 } 1272 1273 static int 1274 restore_sigcontext(CPUState *env, struct target_sigcontext *sc) 1275 { 1276 int err = 0; 1277 uint32_t cpsr; 1278 1279 __get_user_error(env->regs[0], &sc->arm_r0, err); 1280 __get_user_error(env->regs[1], &sc->arm_r1, err); 1281 __get_user_error(env->regs[2], &sc->arm_r2, err); 1282 __get_user_error(env->regs[3], &sc->arm_r3, err); 1283 __get_user_error(env->regs[4], &sc->arm_r4, err); 1284 __get_user_error(env->regs[5], &sc->arm_r5, err); 1285 __get_user_error(env->regs[6], &sc->arm_r6, err); 1286 __get_user_error(env->regs[7], &sc->arm_r7, err); 1287 __get_user_error(env->regs[8], &sc->arm_r8, err); 1288 __get_user_error(env->regs[9], &sc->arm_r9, err); 1289 __get_user_error(env->regs[10], &sc->arm_r10, err); 1290 __get_user_error(env->regs[11], &sc->arm_fp, err); 1291 __get_user_error(env->regs[12], &sc->arm_ip, err); 1292 __get_user_error(env->regs[13], &sc->arm_sp, err); 1293 __get_user_error(env->regs[14], &sc->arm_lr, err); 1294 __get_user_error(env->regs[15], &sc->arm_pc, err); 1295 #ifdef TARGET_CONFIG_CPU_32 1296 __get_user_error(cpsr, &sc->arm_cpsr, err); 1297 cpsr_write(env, cpsr, 0xffffffff); 1298 #endif 1299 1300 err |= !valid_user_regs(env); 1301 1302 return err; 1303 } 1304 1305 long do_sigreturn(CPUState *env) 1306 { 1307 struct sigframe *frame; 1308 target_sigset_t set; 1309 sigset_t host_set; 1310 int i; 1311 1312 /* 1313 * Since we stacked the signal on a 64-bit boundary, 1314 * then 'sp' should be word aligned here. If it's 1315 * not, then the user is trying to mess with us. 1316 */ 1317 if (env->regs[13] & 7) 1318 goto badframe; 1319 1320 frame = (struct sigframe *)g2h(env->regs[13]); 1321 1322 #if 0 1323 if (verify_area(VERIFY_READ, frame, sizeof (*frame))) 1324 goto badframe; 1325 #endif 1326 if (__get_user(set.sig[0], &frame->sc.oldmask)) 1327 goto badframe; 1328 for(i = 1; i < TARGET_NSIG_WORDS; i++) { 1329 if (__get_user(set.sig[i], &frame->extramask[i - 1])) 1330 goto badframe; 1331 } 1332 1333 target_to_host_sigset_internal(&host_set, &set); 1334 sigprocmask(SIG_SETMASK, &host_set, NULL); 1335 1336 if (restore_sigcontext(env, &frame->sc)) 1337 goto badframe; 1338 1339 #if 0 1340 /* Send SIGTRAP if we're single-stepping */ 1341 if (ptrace_cancel_bpt(current)) 1342 send_sig(SIGTRAP, current, 1); 1343 #endif 1344 return env->regs[0]; 1345 1346 badframe: 1347 force_sig(SIGSEGV /* , current */); 1348 return 0; 1349 } 1350 1351 long do_rt_sigreturn(CPUState *env) 1352 { 1353 struct rt_sigframe *frame; 1354 sigset_t host_set; 1355 1356 /* 1357 * Since we stacked the signal on a 64-bit boundary, 1358 * then 'sp' should be word aligned here. If it's 1359 * not, then the user is trying to mess with us. 1360 */ 1361 if (env->regs[13] & 7) 1362 goto badframe; 1363 1364 frame = (struct rt_sigframe *)env->regs[13]; 1365 1366 #if 0 1367 if (verify_area(VERIFY_READ, frame, sizeof (*frame))) 1368 goto badframe; 1369 #endif 1370 target_to_host_sigset(&host_set, &frame->uc.tuc_sigmask); 1371 sigprocmask(SIG_SETMASK, &host_set, NULL); 1372 1373 if (restore_sigcontext(env, &frame->uc.tuc_mcontext)) 1374 goto badframe; 1375 1376 if (do_sigaltstack(h2g(&frame->uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) 1377 goto badframe; 1378 1379 #if 0 1380 /* Send SIGTRAP if we're single-stepping */ 1381 if (ptrace_cancel_bpt(current)) 1382 send_sig(SIGTRAP, current, 1); 1383 #endif 1384 return env->regs[0]; 1385 1386 badframe: 1387 force_sig(SIGSEGV /* , current */); 1388 return 0; 1389 } 1390 1391 #elif defined(TARGET_SPARC) 1392 1393 #define __SUNOS_MAXWIN 31 1394 1395 /* This is what SunOS does, so shall I. */ 1396 struct target_sigcontext { 1397 abi_ulong sigc_onstack; /* state to restore */ 1398 1399 abi_ulong sigc_mask; /* sigmask to restore */ 1400 abi_ulong sigc_sp; /* stack pointer */ 1401 abi_ulong sigc_pc; /* program counter */ 1402 abi_ulong sigc_npc; /* next program counter */ 1403 abi_ulong sigc_psr; /* for condition codes etc */ 1404 abi_ulong sigc_g1; /* User uses these two registers */ 1405 abi_ulong sigc_o0; /* within the trampoline code. */ 1406 1407 /* Now comes information regarding the users window set 1408 * at the time of the signal. 1409 */ 1410 abi_ulong sigc_oswins; /* outstanding windows */ 1411 1412 /* stack ptrs for each regwin buf */ 1413 char *sigc_spbuf[__SUNOS_MAXWIN]; 1414 1415 /* Windows to restore after signal */ 1416 struct { 1417 abi_ulong locals[8]; 1418 abi_ulong ins[8]; 1419 } sigc_wbuf[__SUNOS_MAXWIN]; 1420 }; 1421 /* A Sparc stack frame */ 1422 struct sparc_stackf { 1423 abi_ulong locals[8]; 1424 abi_ulong ins[6]; 1425 struct sparc_stackf *fp; 1426 abi_ulong callers_pc; 1427 char *structptr; 1428 abi_ulong xargs[6]; 1429 abi_ulong xxargs[1]; 1430 }; 1431 1432 typedef struct { 1433 struct { 1434 abi_ulong psr; 1435 abi_ulong pc; 1436 abi_ulong npc; 1437 abi_ulong y; 1438 abi_ulong u_regs[16]; /* globals and ins */ 1439 } si_regs; 1440 int si_mask; 1441 } __siginfo_t; 1442 1443 typedef struct { 1444 unsigned long si_float_regs [32]; 1445 unsigned long si_fsr; 1446 unsigned long si_fpqdepth; 1447 struct { 1448 unsigned long *insn_addr; 1449 unsigned long insn; 1450 } si_fpqueue [16]; 1451 } qemu_siginfo_fpu_t; 1452 1453 1454 struct target_signal_frame { 1455 struct sparc_stackf ss; 1456 __siginfo_t info; 1457 qemu_siginfo_fpu_t *fpu_save; 1458 abi_ulong insns[2] __attribute__ ((aligned (8))); 1459 abi_ulong extramask[TARGET_NSIG_WORDS - 1]; 1460 abi_ulong extra_size; /* Should be 0 */ 1461 qemu_siginfo_fpu_t fpu_state; 1462 }; 1463 struct target_rt_signal_frame { 1464 struct sparc_stackf ss; 1465 siginfo_t info; 1466 abi_ulong regs[20]; 1467 sigset_t mask; 1468 qemu_siginfo_fpu_t *fpu_save; 1469 unsigned int insns[2]; 1470 stack_t stack; 1471 unsigned int extra_size; /* Should be 0 */ 1472 qemu_siginfo_fpu_t fpu_state; 1473 }; 1474 1475 #define UREG_O0 16 1476 #define UREG_O6 22 1477 #define UREG_I0 0 1478 #define UREG_I1 1 1479 #define UREG_I2 2 1480 #define UREG_I3 3 1481 #define UREG_I4 4 1482 #define UREG_I5 5 1483 #define UREG_I6 6 1484 #define UREG_I7 7 1485 #define UREG_L0 8 1486 #define UREG_FP UREG_I6 1487 #define UREG_SP UREG_O6 1488 1489 static inline void *get_sigframe(struct emulated_sigaction *sa, CPUState *env, unsigned long framesize) 1490 { 1491 unsigned long sp; 1492 1493 sp = env->regwptr[UREG_FP]; 1494 1495 /* This is the X/Open sanctioned signal stack switching. */ 1496 if (sa->sa.sa_flags & TARGET_SA_ONSTACK) { 1497 if (!on_sig_stack(sp) 1498 && !((target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size) & 7)) 1499 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; 1500 } 1501 return g2h(sp - framesize); 1502 } 1503 1504 static int 1505 setup___siginfo(__siginfo_t *si, CPUState *env, abi_ulong mask) 1506 { 1507 int err = 0, i; 1508 1509 err |= __put_user(env->psr, &si->si_regs.psr); 1510 err |= __put_user(env->pc, &si->si_regs.pc); 1511 err |= __put_user(env->npc, &si->si_regs.npc); 1512 err |= __put_user(env->y, &si->si_regs.y); 1513 for (i=0; i < 8; i++) { 1514 err |= __put_user(env->gregs[i], &si->si_regs.u_regs[i]); 1515 } 1516 for (i=0; i < 8; i++) { 1517 err |= __put_user(env->regwptr[UREG_I0 + i], &si->si_regs.u_regs[i+8]); 1518 } 1519 err |= __put_user(mask, &si->si_mask); 1520 return err; 1521 } 1522 1523 #if 0 1524 static int 1525 setup_sigcontext(struct target_sigcontext *sc, /*struct _fpstate *fpstate,*/ 1526 CPUState *env, unsigned long mask) 1527 { 1528 int err = 0; 1529 1530 err |= __put_user(mask, &sc->sigc_mask); 1531 err |= __put_user(env->regwptr[UREG_SP], &sc->sigc_sp); 1532 err |= __put_user(env->pc, &sc->sigc_pc); 1533 err |= __put_user(env->npc, &sc->sigc_npc); 1534 err |= __put_user(env->psr, &sc->sigc_psr); 1535 err |= __put_user(env->gregs[1], &sc->sigc_g1); 1536 err |= __put_user(env->regwptr[UREG_O0], &sc->sigc_o0); 1537 1538 return err; 1539 } 1540 #endif 1541 #define NF_ALIGNEDSZ (((sizeof(struct target_signal_frame) + 7) & (~7))) 1542 1543 static void setup_frame(int sig, struct emulated_sigaction *ka, 1544 target_sigset_t *set, CPUState *env) 1545 { 1546 struct target_signal_frame *sf; 1547 int sigframe_size, err, i; 1548 1549 /* 1. Make sure everything is clean */ 1550 //synchronize_user_stack(); 1551 1552 sigframe_size = NF_ALIGNEDSZ; 1553 1554 sf = (struct target_signal_frame *) 1555 get_sigframe(ka, env, sigframe_size); 1556 1557 //fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]); 1558 #if 0 1559 if (invalid_frame_pointer(sf, sigframe_size)) 1560 goto sigill_and_return; 1561 #endif 1562 /* 2. Save the current process state */ 1563 err = setup___siginfo(&sf->info, env, set->sig[0]); 1564 err |= __put_user(0, &sf->extra_size); 1565 1566 //err |= save_fpu_state(regs, &sf->fpu_state); 1567 //err |= __put_user(&sf->fpu_state, &sf->fpu_save); 1568 1569 err |= __put_user(set->sig[0], &sf->info.si_mask); 1570 for (i = 0; i < TARGET_NSIG_WORDS - 1; i++) { 1571 err |= __put_user(set->sig[i + 1], &sf->extramask[i]); 1572 } 1573 1574 for (i = 0; i < 8; i++) { 1575 err |= __put_user(env->regwptr[i + UREG_L0], &sf->ss.locals[i]); 1576 } 1577 for (i = 0; i < 8; i++) { 1578 err |= __put_user(env->regwptr[i + UREG_I0], &sf->ss.ins[i]); 1579 } 1580 if (err) 1581 goto sigsegv; 1582 1583 /* 3. signal handler back-trampoline and parameters */ 1584 env->regwptr[UREG_FP] = h2g(sf); 1585 env->regwptr[UREG_I0] = sig; 1586 env->regwptr[UREG_I1] = h2g(&sf->info); 1587 env->regwptr[UREG_I2] = h2g(&sf->info); 1588 1589 /* 4. signal handler */ 1590 env->pc = (unsigned long) ka->sa._sa_handler; 1591 env->npc = (env->pc + 4); 1592 /* 5. return to kernel instructions */ 1593 if (ka->sa.sa_restorer) 1594 env->regwptr[UREG_I7] = (unsigned long)ka->sa.sa_restorer; 1595 else { 1596 uint32_t val32; 1597 env->regwptr[UREG_I7] = h2g(&(sf->insns[0]) - 2); 1598 1599 /* mov __NR_sigreturn, %g1 */ 1600 val32 = 0x821020d8; 1601 err |= __put_user(val32, &sf->insns[0]); 1602 1603 /* t 0x10 */ 1604 val32 = 0x91d02010; 1605 err |= __put_user(val32, &sf->insns[1]); 1606 if (err) 1607 goto sigsegv; 1608 1609 /* Flush instruction space. */ 1610 //flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0])); 1611 // tb_flush(env); 1612 } 1613 return; 1614 1615 //sigill_and_return: 1616 force_sig(TARGET_SIGILL); 1617 sigsegv: 1618 //fprintf(stderr, "force_sig\n"); 1619 force_sig(TARGET_SIGSEGV); 1620 } 1621 static inline int 1622 restore_fpu_state(CPUState *env, qemu_siginfo_fpu_t *fpu) 1623 { 1624 int err; 1625 #if 0 1626 #ifdef CONFIG_SMP 1627 if (current->flags & PF_USEDFPU) 1628 regs->psr &= ~PSR_EF; 1629 #else 1630 if (current == last_task_used_math) { 1631 last_task_used_math = 0; 1632 regs->psr &= ~PSR_EF; 1633 } 1634 #endif 1635 current->used_math = 1; 1636 current->flags &= ~PF_USEDFPU; 1637 #endif 1638 #if 0 1639 if (verify_area (VERIFY_READ, fpu, sizeof(*fpu))) 1640 return -EFAULT; 1641 #endif 1642 1643 #if 0 1644 /* XXX: incorrect */ 1645 err = __copy_from_user(&env->fpr[0], &fpu->si_float_regs[0], 1646 (sizeof(unsigned long) * 32)); 1647 #endif 1648 err |= __get_user(env->fsr, &fpu->si_fsr); 1649 #if 0 1650 err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth); 1651 if (current->thread.fpqdepth != 0) 1652 err |= __copy_from_user(¤t->thread.fpqueue[0], 1653 &fpu->si_fpqueue[0], 1654 ((sizeof(unsigned long) + 1655 (sizeof(unsigned long *)))*16)); 1656 #endif 1657 return err; 1658 } 1659 1660 1661 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 1662 target_siginfo_t *info, 1663 target_sigset_t *set, CPUState *env) 1664 { 1665 fprintf(stderr, "setup_rt_frame: not implemented\n"); 1666 } 1667 1668 long do_sigreturn(CPUState *env) 1669 { 1670 struct target_signal_frame *sf; 1671 uint32_t up_psr, pc, npc; 1672 target_sigset_t set; 1673 sigset_t host_set; 1674 abi_ulong fpu_save; 1675 int err, i; 1676 1677 sf = (struct target_signal_frame *)g2h(env->regwptr[UREG_FP]); 1678 #if 0 1679 fprintf(stderr, "sigreturn\n"); 1680 fprintf(stderr, "sf: %x pc %x fp %x sp %x\n", sf, env->pc, env->regwptr[UREG_FP], env->regwptr[UREG_SP]); 1681 #endif 1682 //cpu_dump_state(env, stderr, fprintf, 0); 1683 1684 /* 1. Make sure we are not getting garbage from the user */ 1685 #if 0 1686 if (verify_area (VERIFY_READ, sf, sizeof (*sf))) 1687 goto segv_and_exit; 1688 #endif 1689 1690 if (((uint) sf) & 3) 1691 goto segv_and_exit; 1692 1693 err = __get_user(pc, &sf->info.si_regs.pc); 1694 err |= __get_user(npc, &sf->info.si_regs.npc); 1695 1696 if ((pc | npc) & 3) 1697 goto segv_and_exit; 1698 1699 /* 2. Restore the state */ 1700 err |= __get_user(up_psr, &sf->info.si_regs.psr); 1701 1702 /* User can only change condition codes and FPU enabling in %psr. */ 1703 env->psr = (up_psr & (PSR_ICC /* | PSR_EF */)) 1704 | (env->psr & ~(PSR_ICC /* | PSR_EF */)); 1705 1706 env->pc = pc; 1707 env->npc = npc; 1708 err |= __get_user(env->y, &sf->info.si_regs.y); 1709 for (i=0; i < 8; i++) { 1710 err |= __get_user(env->gregs[i], &sf->info.si_regs.u_regs[i]); 1711 } 1712 for (i=0; i < 8; i++) { 1713 err |= __get_user(env->regwptr[i + UREG_I0], &sf->info.si_regs.u_regs[i+8]); 1714 } 1715 1716 err |= __get_user(fpu_save, (abi_ulong *)&sf->fpu_save); 1717 1718 //if (fpu_save) 1719 // err |= restore_fpu_state(env, fpu_save); 1720 1721 /* This is pretty much atomic, no amount locking would prevent 1722 * the races which exist anyways. 1723 */ 1724 err |= __get_user(set.sig[0], &sf->info.si_mask); 1725 for(i = 1; i < TARGET_NSIG_WORDS; i++) { 1726 err |= (__get_user(set.sig[i], &sf->extramask[i - 1])); 1727 } 1728 1729 target_to_host_sigset_internal(&host_set, &set); 1730 sigprocmask(SIG_SETMASK, &host_set, NULL); 1731 1732 if (err) 1733 goto segv_and_exit; 1734 1735 return env->regwptr[0]; 1736 1737 segv_and_exit: 1738 force_sig(TARGET_SIGSEGV); 1739 } 1740 1741 long do_rt_sigreturn(CPUState *env) 1742 { 1743 fprintf(stderr, "do_rt_sigreturn: not implemented\n"); 1744 return -ENOSYS; 1745 } 1746 1747 #ifdef TARGET_SPARC64 1748 #define MC_TSTATE 0 1749 #define MC_PC 1 1750 #define MC_NPC 2 1751 #define MC_Y 3 1752 #define MC_G1 4 1753 #define MC_G2 5 1754 #define MC_G3 6 1755 #define MC_G4 7 1756 #define MC_G5 8 1757 #define MC_G6 9 1758 #define MC_G7 10 1759 #define MC_O0 11 1760 #define MC_O1 12 1761 #define MC_O2 13 1762 #define MC_O3 14 1763 #define MC_O4 15 1764 #define MC_O5 16 1765 #define MC_O6 17 1766 #define MC_O7 18 1767 #define MC_NGREG 19 1768 1769 typedef abi_ulong target_mc_greg_t; 1770 typedef target_mc_greg_t target_mc_gregset_t[MC_NGREG]; 1771 1772 struct target_mc_fq { 1773 abi_ulong *mcfq_addr; 1774 uint32_t mcfq_insn; 1775 }; 1776 1777 struct target_mc_fpu { 1778 union { 1779 uint32_t sregs[32]; 1780 uint64_t dregs[32]; 1781 //uint128_t qregs[16]; 1782 } mcfpu_fregs; 1783 abi_ulong mcfpu_fsr; 1784 abi_ulong mcfpu_fprs; 1785 abi_ulong mcfpu_gsr; 1786 struct target_mc_fq *mcfpu_fq; 1787 unsigned char mcfpu_qcnt; 1788 unsigned char mcfpu_qentsz; 1789 unsigned char mcfpu_enab; 1790 }; 1791 typedef struct target_mc_fpu target_mc_fpu_t; 1792 1793 typedef struct { 1794 target_mc_gregset_t mc_gregs; 1795 target_mc_greg_t mc_fp; 1796 target_mc_greg_t mc_i7; 1797 target_mc_fpu_t mc_fpregs; 1798 } target_mcontext_t; 1799 1800 struct target_ucontext { 1801 struct target_ucontext *uc_link; 1802 abi_ulong uc_flags; 1803 target_sigset_t uc_sigmask; 1804 target_mcontext_t uc_mcontext; 1805 }; 1806 1807 /* A V9 register window */ 1808 struct target_reg_window { 1809 abi_ulong locals[8]; 1810 abi_ulong ins[8]; 1811 }; 1812 1813 #define TARGET_STACK_BIAS 2047 1814 1815 /* {set, get}context() needed for 64-bit SparcLinux userland. */ 1816 void sparc64_set_context(CPUSPARCState *env) 1817 { 1818 struct target_ucontext *ucp = (struct target_ucontext *) 1819 env->regwptr[UREG_I0]; 1820 target_mc_gregset_t *grp; 1821 abi_ulong pc, npc, tstate; 1822 abi_ulong fp, i7; 1823 unsigned char fenab; 1824 int err; 1825 unsigned int i; 1826 abi_ulong *src, *dst; 1827 1828 grp = &ucp->uc_mcontext.mc_gregs; 1829 err = __get_user(pc, &((*grp)[MC_PC])); 1830 err |= __get_user(npc, &((*grp)[MC_NPC])); 1831 if (err || ((pc | npc) & 3)) 1832 goto do_sigsegv; 1833 if (env->regwptr[UREG_I1]) { 1834 target_sigset_t target_set; 1835 sigset_t set; 1836 1837 if (TARGET_NSIG_WORDS == 1) { 1838 if (__get_user(target_set.sig[0], &ucp->uc_sigmask.sig[0])) 1839 goto do_sigsegv; 1840 } else { 1841 src = &ucp->uc_sigmask; 1842 dst = &target_set; 1843 for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong); 1844 i++, dst++, src++) 1845 err |= __get_user(dst, src); 1846 if (err) 1847 goto do_sigsegv; 1848 } 1849 target_to_host_sigset_internal(&set, &target_set); 1850 sigprocmask(SIG_SETMASK, &set, NULL); 1851 } 1852 env->pc = pc; 1853 env->npc = npc; 1854 err |= __get_user(env->y, &((*grp)[MC_Y])); 1855 err |= __get_user(tstate, &((*grp)[MC_TSTATE])); 1856 env->asi = (tstate >> 24) & 0xff; 1857 PUT_CCR(env, tstate >> 32); 1858 PUT_CWP64(env, tstate & 0x1f); 1859 err |= __get_user(env->gregs[1], (&(*grp)[MC_G1])); 1860 err |= __get_user(env->gregs[2], (&(*grp)[MC_G2])); 1861 err |= __get_user(env->gregs[3], (&(*grp)[MC_G3])); 1862 err |= __get_user(env->gregs[4], (&(*grp)[MC_G4])); 1863 err |= __get_user(env->gregs[5], (&(*grp)[MC_G5])); 1864 err |= __get_user(env->gregs[6], (&(*grp)[MC_G6])); 1865 err |= __get_user(env->gregs[7], (&(*grp)[MC_G7])); 1866 err |= __get_user(env->regwptr[UREG_I0], (&(*grp)[MC_O0])); 1867 err |= __get_user(env->regwptr[UREG_I1], (&(*grp)[MC_O1])); 1868 err |= __get_user(env->regwptr[UREG_I2], (&(*grp)[MC_O2])); 1869 err |= __get_user(env->regwptr[UREG_I3], (&(*grp)[MC_O3])); 1870 err |= __get_user(env->regwptr[UREG_I4], (&(*grp)[MC_O4])); 1871 err |= __get_user(env->regwptr[UREG_I5], (&(*grp)[MC_O5])); 1872 err |= __get_user(env->regwptr[UREG_I6], (&(*grp)[MC_O6])); 1873 err |= __get_user(env->regwptr[UREG_I7], (&(*grp)[MC_O7])); 1874 1875 err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp)); 1876 err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7)); 1877 err |= __put_user(fp, 1878 (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[6]))); 1879 err |= __put_user(i7, 1880 (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[7]))); 1881 1882 err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab)); 1883 err |= __get_user(env->fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs)); 1884 src = &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs); 1885 dst = &env->fpr; 1886 for (i = 0; i < 64; i++, dst++, src++) 1887 err |= __get_user(dst, src); 1888 err |= __get_user(env->fsr, 1889 &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr)); 1890 err |= __get_user(env->gsr, 1891 &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr)); 1892 if (err) 1893 goto do_sigsegv; 1894 1895 return; 1896 do_sigsegv: 1897 force_sig(SIGSEGV); 1898 } 1899 1900 void sparc64_get_context(CPUSPARCState *env) 1901 { 1902 struct target_ucontext *ucp = (struct target_ucontext *) 1903 env->regwptr[UREG_I0]; 1904 target_mc_gregset_t *grp; 1905 target_mcontext_t *mcp; 1906 abi_ulong fp, i7; 1907 int err; 1908 unsigned int i; 1909 abi_ulong *src, *dst; 1910 target_sigset_t target_set; 1911 sigset_t set; 1912 1913 mcp = &ucp->uc_mcontext; 1914 grp = &mcp->mc_gregs; 1915 1916 /* Skip over the trap instruction, first. */ 1917 env->pc = env->npc; 1918 env->npc += 4; 1919 1920 err = 0; 1921 1922 sigprocmask(0, NULL, &set); 1923 host_to_target_sigset_internal(&target_set, &set); 1924 if (TARGET_NSIG_WORDS == 1) 1925 err |= __put_user(target_set.sig[0], 1926 (abi_ulong *)&ucp->uc_sigmask); 1927 else { 1928 src = &target_set; 1929 dst = &ucp->uc_sigmask; 1930 for (i = 0; i < sizeof(target_sigset_t) / sizeof(abi_ulong); 1931 i++, dst++, src++) 1932 err |= __put_user(src, dst); 1933 if (err) 1934 goto do_sigsegv; 1935 } 1936 1937 err |= __put_user(env->tstate, &((*grp)[MC_TSTATE])); 1938 err |= __put_user(env->pc, &((*grp)[MC_PC])); 1939 err |= __put_user(env->npc, &((*grp)[MC_NPC])); 1940 err |= __put_user(env->y, &((*grp)[MC_Y])); 1941 err |= __put_user(env->gregs[1], &((*grp)[MC_G1])); 1942 err |= __put_user(env->gregs[2], &((*grp)[MC_G2])); 1943 err |= __put_user(env->gregs[3], &((*grp)[MC_G3])); 1944 err |= __put_user(env->gregs[4], &((*grp)[MC_G4])); 1945 err |= __put_user(env->gregs[5], &((*grp)[MC_G5])); 1946 err |= __put_user(env->gregs[6], &((*grp)[MC_G6])); 1947 err |= __put_user(env->gregs[7], &((*grp)[MC_G7])); 1948 err |= __put_user(env->regwptr[UREG_I0], &((*grp)[MC_O0])); 1949 err |= __put_user(env->regwptr[UREG_I1], &((*grp)[MC_O1])); 1950 err |= __put_user(env->regwptr[UREG_I2], &((*grp)[MC_O2])); 1951 err |= __put_user(env->regwptr[UREG_I3], &((*grp)[MC_O3])); 1952 err |= __put_user(env->regwptr[UREG_I4], &((*grp)[MC_O4])); 1953 err |= __put_user(env->regwptr[UREG_I5], &((*grp)[MC_O5])); 1954 err |= __put_user(env->regwptr[UREG_I6], &((*grp)[MC_O6])); 1955 err |= __put_user(env->regwptr[UREG_I7], &((*grp)[MC_O7])); 1956 1957 err |= __get_user(fp, 1958 (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[6]))); 1959 err |= __get_user(i7, 1960 (&(((struct target_reg_window *)(TARGET_STACK_BIAS+env->regwptr[UREG_I6]))->ins[7]))); 1961 err |= __put_user(fp, &(mcp->mc_fp)); 1962 err |= __put_user(i7, &(mcp->mc_i7)); 1963 1964 src = &env->fpr; 1965 dst = &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs); 1966 for (i = 0; i < 64; i++, dst++, src++) 1967 err |= __put_user(src, dst); 1968 err |= __put_user(env->fsr, &(mcp->mc_fpregs.mcfpu_fsr)); 1969 err |= __put_user(env->gsr, &(mcp->mc_fpregs.mcfpu_gsr)); 1970 err |= __put_user(env->fprs, &(mcp->mc_fpregs.mcfpu_fprs)); 1971 1972 if (err) 1973 goto do_sigsegv; 1974 1975 return; 1976 do_sigsegv: 1977 force_sig(SIGSEGV); 1978 } 1979 #endif 1980 #elif defined(TARGET_ABI_MIPSN64) 1981 1982 # warning signal handling not implemented 1983 1984 static void setup_frame(int sig, struct emulated_sigaction *ka, 1985 target_sigset_t *set, CPUState *env) 1986 { 1987 fprintf(stderr, "setup_frame: not implemented\n"); 1988 } 1989 1990 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 1991 target_siginfo_t *info, 1992 target_sigset_t *set, CPUState *env) 1993 { 1994 fprintf(stderr, "setup_rt_frame: not implemented\n"); 1995 } 1996 1997 long do_sigreturn(CPUState *env) 1998 { 1999 fprintf(stderr, "do_sigreturn: not implemented\n"); 2000 return -ENOSYS; 2001 } 2002 2003 long do_rt_sigreturn(CPUState *env) 2004 { 2005 fprintf(stderr, "do_rt_sigreturn: not implemented\n"); 2006 return -ENOSYS; 2007 } 2008 2009 #elif defined(TARGET_ABI_MIPSN32) 2010 2011 # warning signal handling not implemented 2012 2013 static void setup_frame(int sig, struct emulated_sigaction *ka, 2014 target_sigset_t *set, CPUState *env) 2015 { 2016 fprintf(stderr, "setup_frame: not implemented\n"); 2017 } 2018 2019 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 2020 target_siginfo_t *info, 2021 target_sigset_t *set, CPUState *env) 2022 { 2023 fprintf(stderr, "setup_rt_frame: not implemented\n"); 2024 } 2025 2026 long do_sigreturn(CPUState *env) 2027 { 2028 fprintf(stderr, "do_sigreturn: not implemented\n"); 2029 return -ENOSYS; 2030 } 2031 2032 long do_rt_sigreturn(CPUState *env) 2033 { 2034 fprintf(stderr, "do_rt_sigreturn: not implemented\n"); 2035 return -ENOSYS; 2036 } 2037 2038 #elif defined(TARGET_ABI_MIPSO32) 2039 2040 struct target_sigcontext { 2041 uint32_t sc_regmask; /* Unused */ 2042 uint32_t sc_status; 2043 uint64_t sc_pc; 2044 uint64_t sc_regs[32]; 2045 uint64_t sc_fpregs[32]; 2046 uint32_t sc_ownedfp; /* Unused */ 2047 uint32_t sc_fpc_csr; 2048 uint32_t sc_fpc_eir; /* Unused */ 2049 uint32_t sc_used_math; 2050 uint32_t sc_dsp; /* dsp status, was sc_ssflags */ 2051 uint64_t sc_mdhi; 2052 uint64_t sc_mdlo; 2053 target_ulong sc_hi1; /* Was sc_cause */ 2054 target_ulong sc_lo1; /* Was sc_badvaddr */ 2055 target_ulong sc_hi2; /* Was sc_sigset[4] */ 2056 target_ulong sc_lo2; 2057 target_ulong sc_hi3; 2058 target_ulong sc_lo3; 2059 }; 2060 2061 struct sigframe { 2062 uint32_t sf_ass[4]; /* argument save space for o32 */ 2063 uint32_t sf_code[2]; /* signal trampoline */ 2064 struct target_sigcontext sf_sc; 2065 target_sigset_t sf_mask; 2066 }; 2067 2068 /* Install trampoline to jump back from signal handler */ 2069 static inline int install_sigtramp(unsigned int *tramp, unsigned int syscall) 2070 { 2071 int err; 2072 2073 /* 2074 * Set up the return code ... 2075 * 2076 * li v0, __NR__foo_sigreturn 2077 * syscall 2078 */ 2079 2080 err = __put_user(0x24020000 + syscall, tramp + 0); 2081 err |= __put_user(0x0000000c , tramp + 1); 2082 /* flush_cache_sigtramp((unsigned long) tramp); */ 2083 return err; 2084 } 2085 2086 static inline int 2087 setup_sigcontext(CPUState *regs, struct target_sigcontext *sc) 2088 { 2089 int err = 0; 2090 2091 err |= __put_user(regs->PC[regs->current_tc], &sc->sc_pc); 2092 2093 #define save_gp_reg(i) do { \ 2094 err |= __put_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]); \ 2095 } while(0) 2096 __put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2); 2097 save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6); 2098 save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10); 2099 save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14); 2100 save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18); 2101 save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22); 2102 save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26); 2103 save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30); 2104 save_gp_reg(31); 2105 #undef save_gp_reg 2106 2107 err |= __put_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi); 2108 err |= __put_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo); 2109 2110 /* Not used yet, but might be useful if we ever have DSP suppport */ 2111 #if 0 2112 if (cpu_has_dsp) { 2113 err |= __put_user(mfhi1(), &sc->sc_hi1); 2114 err |= __put_user(mflo1(), &sc->sc_lo1); 2115 err |= __put_user(mfhi2(), &sc->sc_hi2); 2116 err |= __put_user(mflo2(), &sc->sc_lo2); 2117 err |= __put_user(mfhi3(), &sc->sc_hi3); 2118 err |= __put_user(mflo3(), &sc->sc_lo3); 2119 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); 2120 } 2121 /* same with 64 bit */ 2122 #ifdef CONFIG_64BIT 2123 err |= __put_user(regs->hi, &sc->sc_hi[0]); 2124 err |= __put_user(regs->lo, &sc->sc_lo[0]); 2125 if (cpu_has_dsp) { 2126 err |= __put_user(mfhi1(), &sc->sc_hi[1]); 2127 err |= __put_user(mflo1(), &sc->sc_lo[1]); 2128 err |= __put_user(mfhi2(), &sc->sc_hi[2]); 2129 err |= __put_user(mflo2(), &sc->sc_lo[2]); 2130 err |= __put_user(mfhi3(), &sc->sc_hi[3]); 2131 err |= __put_user(mflo3(), &sc->sc_lo[3]); 2132 err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp); 2133 } 2134 #endif 2135 #endif 2136 2137 #if 0 2138 err |= __put_user(!!used_math(), &sc->sc_used_math); 2139 2140 if (!used_math()) 2141 goto out; 2142 2143 /* 2144 * Save FPU state to signal context. Signal handler will "inherit" 2145 * current FPU state. 2146 */ 2147 preempt_disable(); 2148 2149 if (!is_fpu_owner()) { 2150 own_fpu(); 2151 restore_fp(current); 2152 } 2153 err |= save_fp_context(sc); 2154 2155 preempt_enable(); 2156 out: 2157 #endif 2158 return err; 2159 } 2160 2161 static inline int 2162 restore_sigcontext(CPUState *regs, struct target_sigcontext *sc) 2163 { 2164 int err = 0; 2165 2166 err |= __get_user(regs->CP0_EPC, &sc->sc_pc); 2167 2168 err |= __get_user(regs->HI[0][regs->current_tc], &sc->sc_mdhi); 2169 err |= __get_user(regs->LO[0][regs->current_tc], &sc->sc_mdlo); 2170 2171 #define restore_gp_reg(i) do { \ 2172 err |= __get_user(regs->gpr[i][regs->current_tc], &sc->sc_regs[i]); \ 2173 } while(0) 2174 restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3); 2175 restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6); 2176 restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9); 2177 restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12); 2178 restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15); 2179 restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18); 2180 restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21); 2181 restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24); 2182 restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27); 2183 restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30); 2184 restore_gp_reg(31); 2185 #undef restore_gp_reg 2186 2187 #if 0 2188 if (cpu_has_dsp) { 2189 err |= __get_user(treg, &sc->sc_hi1); mthi1(treg); 2190 err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg); 2191 err |= __get_user(treg, &sc->sc_hi2); mthi2(treg); 2192 err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg); 2193 err |= __get_user(treg, &sc->sc_hi3); mthi3(treg); 2194 err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg); 2195 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); 2196 } 2197 #ifdef CONFIG_64BIT 2198 err |= __get_user(regs->hi, &sc->sc_hi[0]); 2199 err |= __get_user(regs->lo, &sc->sc_lo[0]); 2200 if (cpu_has_dsp) { 2201 err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg); 2202 err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg); 2203 err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg); 2204 err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg); 2205 err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg); 2206 err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg); 2207 err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK); 2208 } 2209 #endif 2210 2211 err |= __get_user(used_math, &sc->sc_used_math); 2212 conditional_used_math(used_math); 2213 2214 preempt_disable(); 2215 2216 if (used_math()) { 2217 /* restore fpu context if we have used it before */ 2218 own_fpu(); 2219 err |= restore_fp_context(sc); 2220 } else { 2221 /* signal handler may have used FPU. Give it up. */ 2222 lose_fpu(); 2223 } 2224 2225 preempt_enable(); 2226 #endif 2227 return err; 2228 } 2229 /* 2230 * Determine which stack to use.. 2231 */ 2232 static inline abi_ulong 2233 get_sigframe(struct emulated_sigaction *ka, CPUState *regs, size_t frame_size) 2234 { 2235 unsigned long sp; 2236 2237 /* Default to using normal stack */ 2238 sp = regs->gpr[29][regs->current_tc]; 2239 2240 /* 2241 * FPU emulator may have it's own trampoline active just 2242 * above the user stack, 16-bytes before the next lowest 2243 * 16 byte boundary. Try to avoid trashing it. 2244 */ 2245 sp -= 32; 2246 2247 /* This is the X/Open sanctioned signal stack switching. */ 2248 if ((ka->sa.sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) { 2249 sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size; 2250 } 2251 2252 return (sp - frame_size) & ~7; 2253 } 2254 2255 /* compare linux/arch/mips/kernel/signal.c:setup_frame() */ 2256 static void setup_frame(int sig, struct emulated_sigaction * ka, 2257 target_sigset_t *set, CPUState *regs) 2258 { 2259 struct sigframe *frame; 2260 abi_ulong frame_addr; 2261 int i; 2262 2263 frame_addr = get_sigframe(ka, regs, sizeof(*frame)); 2264 if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) 2265 goto give_sigsegv; 2266 2267 install_sigtramp(frame->sf_code, TARGET_NR_sigreturn); 2268 2269 if(setup_sigcontext(regs, &frame->sf_sc)) 2270 goto give_sigsegv; 2271 2272 for(i = 0; i < TARGET_NSIG_WORDS; i++) { 2273 if(__put_user(set->sig[i], &frame->sf_mask.sig[i])) 2274 goto give_sigsegv; 2275 } 2276 2277 /* 2278 * Arguments to signal handler: 2279 * 2280 * a0 = signal number 2281 * a1 = 0 (should be cause) 2282 * a2 = pointer to struct sigcontext 2283 * 2284 * $25 and PC point to the signal handler, $29 points to the 2285 * struct sigframe. 2286 */ 2287 regs->gpr[ 4][regs->current_tc] = sig; 2288 regs->gpr[ 5][regs->current_tc] = 0; 2289 regs->gpr[ 6][regs->current_tc] = h2g(&frame->sf_sc); 2290 regs->gpr[29][regs->current_tc] = h2g(frame); 2291 regs->gpr[31][regs->current_tc] = h2g(frame->sf_code); 2292 /* The original kernel code sets CP0_EPC to the handler 2293 * since it returns to userland using eret 2294 * we cannot do this here, and we must set PC directly */ 2295 regs->PC[regs->current_tc] = regs->gpr[25][regs->current_tc] = ka->sa._sa_handler; 2296 unlock_user_struct(frame, frame_addr, 1); 2297 return; 2298 2299 give_sigsegv: 2300 unlock_user_struct(frame, frame_addr, 1); 2301 force_sig(TARGET_SIGSEGV/*, current*/); 2302 return; 2303 } 2304 2305 long do_sigreturn(CPUState *regs) 2306 { 2307 struct sigframe *frame; 2308 abi_ulong frame_addr; 2309 sigset_t blocked; 2310 target_sigset_t target_set; 2311 int i; 2312 2313 #if defined(DEBUG_SIGNAL) 2314 fprintf(stderr, "do_sigreturn\n"); 2315 #endif 2316 frame_addr = regs->gpr[29][regs->current_tc]; 2317 if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) 2318 goto badframe; 2319 2320 for(i = 0; i < TARGET_NSIG_WORDS; i++) { 2321 if(__get_user(target_set.sig[i], &frame->sf_mask.sig[i])) 2322 goto badframe; 2323 } 2324 2325 target_to_host_sigset_internal(&blocked, &target_set); 2326 sigprocmask(SIG_SETMASK, &blocked, NULL); 2327 2328 if (restore_sigcontext(regs, &frame->sf_sc)) 2329 goto badframe; 2330 2331 #if 0 2332 /* 2333 * Don't let your children do this ... 2334 */ 2335 __asm__ __volatile__( 2336 "move\t$29, %0\n\t" 2337 "j\tsyscall_exit" 2338 :/* no outputs */ 2339 :"r" (®s)); 2340 /* Unreached */ 2341 #endif 2342 2343 regs->PC[regs->current_tc] = regs->CP0_EPC; 2344 /* I am not sure this is right, but it seems to work 2345 * maybe a problem with nested signals ? */ 2346 regs->CP0_EPC = 0; 2347 return 0; 2348 2349 badframe: 2350 force_sig(TARGET_SIGSEGV/*, current*/); 2351 return 0; 2352 } 2353 2354 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 2355 target_siginfo_t *info, 2356 target_sigset_t *set, CPUState *env) 2357 { 2358 fprintf(stderr, "setup_rt_frame: not implemented\n"); 2359 } 2360 2361 long do_rt_sigreturn(CPUState *env) 2362 { 2363 fprintf(stderr, "do_rt_sigreturn: not implemented\n"); 2364 return -ENOSYS; 2365 } 2366 2367 #else 2368 2369 static void setup_frame(int sig, struct emulated_sigaction *ka, 2370 target_sigset_t *set, CPUState *env) 2371 { 2372 fprintf(stderr, "setup_frame: not implemented\n"); 2373 } 2374 2375 static void setup_rt_frame(int sig, struct emulated_sigaction *ka, 2376 target_siginfo_t *info, 2377 target_sigset_t *set, CPUState *env) 2378 { 2379 fprintf(stderr, "setup_rt_frame: not implemented\n"); 2380 } 2381 2382 long do_sigreturn(CPUState *env) 2383 { 2384 fprintf(stderr, "do_sigreturn: not implemented\n"); 2385 return -ENOSYS; 2386 } 2387 2388 long do_rt_sigreturn(CPUState *env) 2389 { 2390 fprintf(stderr, "do_rt_sigreturn: not implemented\n"); 2391 return -ENOSYS; 2392 } 2393 2394 #endif 2395 2396 void process_pending_signals(void *cpu_env) 2397 { 2398 int sig; 2399 abi_ulong handler; 2400 sigset_t set, old_set; 2401 target_sigset_t target_old_set; 2402 struct emulated_sigaction *k; 2403 struct sigqueue *q; 2404 2405 if (!signal_pending) 2406 return; 2407 2408 k = sigact_table; 2409 for(sig = 1; sig <= TARGET_NSIG; sig++) { 2410 if (k->pending) 2411 goto handle_signal; 2412 k++; 2413 } 2414 /* if no signal is pending, just return */ 2415 signal_pending = 0; 2416 return; 2417 2418 handle_signal: 2419 #ifdef DEBUG_SIGNAL 2420 fprintf(stderr, "qemu: process signal %d\n", sig); 2421 #endif 2422 /* dequeue signal */ 2423 q = k->first; 2424 k->first = q->next; 2425 if (!k->first) 2426 k->pending = 0; 2427 2428 sig = gdb_handlesig (cpu_env, sig); 2429 if (!sig) { 2430 fprintf (stderr, "Lost signal\n"); 2431 abort(); 2432 } 2433 2434 handler = k->sa._sa_handler; 2435 if (handler == TARGET_SIG_DFL) { 2436 /* default handler : ignore some signal. The other are fatal */ 2437 if (sig != TARGET_SIGCHLD && 2438 sig != TARGET_SIGURG && 2439 sig != TARGET_SIGWINCH) { 2440 force_sig(sig); 2441 } 2442 } else if (handler == TARGET_SIG_IGN) { 2443 /* ignore sig */ 2444 } else if (handler == TARGET_SIG_ERR) { 2445 force_sig(sig); 2446 } else { 2447 /* compute the blocked signals during the handler execution */ 2448 target_to_host_sigset(&set, &k->sa.sa_mask); 2449 /* SA_NODEFER indicates that the current signal should not be 2450 blocked during the handler */ 2451 if (!(k->sa.sa_flags & TARGET_SA_NODEFER)) 2452 sigaddset(&set, target_to_host_signal(sig)); 2453 2454 /* block signals in the handler using Linux */ 2455 sigprocmask(SIG_BLOCK, &set, &old_set); 2456 /* save the previous blocked signal state to restore it at the 2457 end of the signal execution (see do_sigreturn) */ 2458 host_to_target_sigset_internal(&target_old_set, &old_set); 2459 2460 /* if the CPU is in VM86 mode, we restore the 32 bit values */ 2461 #if defined(TARGET_I386) && !defined(TARGET_X86_64) 2462 { 2463 CPUX86State *env = cpu_env; 2464 if (env->eflags & VM_MASK) 2465 save_v86_state(env); 2466 } 2467 #endif 2468 /* prepare the stack frame of the virtual CPU */ 2469 if (k->sa.sa_flags & TARGET_SA_SIGINFO) 2470 setup_rt_frame(sig, k, &q->info, &target_old_set, cpu_env); 2471 else 2472 setup_frame(sig, k, &target_old_set, cpu_env); 2473 if (k->sa.sa_flags & TARGET_SA_RESETHAND) 2474 k->sa._sa_handler = TARGET_SIG_DFL; 2475 } 2476 if (q != &k->info) 2477 free_sigqueue(q); 2478 } 2479