arch/x86_64/ia32/ia32_signal.c

   1 /*
   2  *  linux/arch/x86_64/ia32/ia32_signal.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *
   6  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
   7  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
   8  *  2000-12-*   x86-64 compatibility mode signal handling by Andi Kleen
   9  *
  10  *  $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 ak Exp $
  11  */
  12
  13 #include <linux/sched.h>
  14 #include <linux/mm.h>
  15 #include <linux/smp.h>
  16 #include <linux/smp_lock.h>
  17 #include <linux/kernel.h>
  18 #include <linux/signal.h>
  19 #include <linux/errno.h>
  20 #include <linux/wait.h>
  21 #include <linux/ptrace.h>
  22 #include <linux/unistd.h>
  23 #include <linux/stddef.h>
  24 #include <linux/personality.h>
  25 #include <linux/compat.h>
  26 #include <asm/ucontext.h>
  27 #include <asm/uaccess.h>
  28 #include <asm/i387.h>
  29 #include <asm/ia32.h>
  30 #include <asm/ptrace.h>
  31 #include <asm/ia32_unistd.h>
  32 #include <asm/user32.h>
  33 #include <asm/sigcontext32.h>
  34 #include <asm/fpu32.h>
  35 #include <asm/proto.h>
  36 #include <asm/vsyscall32.h>
  37
  38 #define DEBUG_SIG 0
  39
  40 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  41
  42 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
  43 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
  44
  45 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
  46 {
  47         int err;
  48         if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
  49                 return -EFAULT;
  50
  51         /* If you change siginfo_t structure, please make sure that
  52            this code is fixed accordingly.
  53            It should never copy any pad contained in the structure
  54            to avoid security leaks, but must copy the generic
  55            3 ints plus the relevant union member.  */
  56         err = __put_user(from->si_signo, &to->si_signo);
  57         err |= __put_user(from->si_errno, &to->si_errno);
  58         err |= __put_user((short)from->si_code, &to->si_code);
  59
  60         if (from->si_code < 0) {
  61                 err |= __put_user(from->si_pid, &to->si_pid);
  62                 err |= __put_user(from->si_uid, &to->si_uid);
  63                 err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
  64         } else {
  65                 /* First 32bits of unions are always present:
  66                  * si_pid === si_band === si_tid === si_addr(LS half) */
  67                 err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
  68                 switch (from->si_code >> 16) {
  69                 case __SI_FAULT >> 16:
  70                         break;
  71                 case __SI_CHLD >> 16:
  72                         err |= __put_user(from->si_utime, &to->si_utime);
  73                         err |= __put_user(from->si_stime, &to->si_stime);
  74                         err |= __put_user(from->si_status, &to->si_status);
  75                         /* FALL THROUGH */
  76                 default:
  77                 case __SI_KILL >> 16:
  78                         err |= __put_user(from->si_uid, &to->si_uid);
  79                         break;
  80                 case __SI_POLL >> 16:
  81                         err |= __put_user(from->si_fd, &to->si_fd);
  82                         break;
  83                 case __SI_TIMER >> 16:
  84                         err |= __put_user(from->si_overrun, &to->si_overrun);
  85                         err |= __put_user(ptr_to_compat(from->si_ptr),
  86                                         &to->si_ptr);
  87                         break;
  88                 case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
  89                 case __SI_MESGQ >> 16:
  90                         err |= __put_user(from->si_uid, &to->si_uid);
  91                         err |= __put_user(from->si_int, &to->si_int);
  92                         break;
  93                 }
  94         }
  95         return err;
  96 }
  97
  98 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
  99 {
 100         int err;
 101         u32 ptr32;
 102         if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
 103                 return -EFAULT;
 104
 105         err = __get_user(to->si_signo, &from->si_signo);
 106         err |= __get_user(to->si_errno, &from->si_errno);
 107         err |= __get_user(to->si_code, &from->si_code);
 108
 109         err |= __get_user(to->si_pid, &from->si_pid);
 110         err |= __get_user(to->si_uid, &from->si_uid);
 111         err |= __get_user(ptr32, &from->si_ptr);
 112         to->si_ptr = compat_ptr(ptr32);
 113
 114         return err;
 115 }
 116
 117 asmlinkage long
 118 sys32_sigsuspend(int history0, int history1, old_sigset_t mask,
 119                  struct pt_regs *regs)
 120 {
 121         sigset_t saveset;
 122
 123         mask &= _BLOCKABLE;
 124         spin_lock_irq(&current->sighand->siglock);
 125         saveset = current->blocked;
 126         siginitset(&current->blocked, mask);
 127         recalc_sigpending();
 128         spin_unlock_irq(&current->sighand->siglock);
 129
 130         regs->rax = -EINTR;
 131         while (1) {
 132                 current->state = TASK_INTERRUPTIBLE;
 133                 schedule();
 134                 if (do_signal(regs, &saveset))
 135                         return -EINTR;
 136         }
 137 }
 138
 139 asmlinkage long
 140 sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
 141                   stack_ia32_t __user *uoss_ptr,
 142                   struct pt_regs *regs)
 143 {
 144         stack_t uss,uoss;
 145         int ret;
 146         mm_segment_t seg;
 147         if (uss_ptr) {
 148                 u32 ptr;
 149                 memset(&uss,0,sizeof(stack_t));
 150                 if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) ||
 151                             __get_user(ptr, &uss_ptr->ss_sp) ||
 152                             __get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
 153                             __get_user(uss.ss_size, &uss_ptr->ss_size))
 154                         return -EFAULT;
 155                 uss.ss_sp = compat_ptr(ptr);
 156         }
 157         seg = get_fs();
 158         set_fs(KERNEL_DS);
 159         ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp);
 160         set_fs(seg);
 161         if (ret >= 0 && uoss_ptr)  {
 162                 if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) ||
 163                     __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
 164                     __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
 165                     __put_user(uoss.ss_size, &uoss_ptr->ss_size))
 166                         ret = -EFAULT;
 167         }
 168         return ret;
 169 }
 170
 171 /*
 172  * Do a signal return; undo the signal stack.
 173  */
 174
 175 struct sigframe
 176 {
 177         u32 pretcode;
 178         int sig;
 179         struct sigcontext_ia32 sc;
 180         struct _fpstate_ia32 fpstate;
 181         unsigned int extramask[_COMPAT_NSIG_WORDS-1];
 182         char retcode[8];
 183 };
 184
 185 struct rt_sigframe
 186 {
 187         u32 pretcode;
 188         int sig;
 189         u32 pinfo;
 190         u32 puc;
 191         compat_siginfo_t info;
 192         struct ucontext_ia32 uc;
 193         struct _fpstate_ia32 fpstate;
 194         char retcode[8];
 195 };
 196
 197 static int
 198 ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned int *peax)
 199 {
 200         unsigned int err = 0;
 201
 202         /* Always make any pending restarted system calls return -EINTR */
 203         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 204
 205 #if DEBUG_SIG
 206         printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
 207                 sc, sc->err, sc->eip, sc->cs, sc->eflags);
 208 #endif
 209 #define COPY(x)         { \
 210         unsigned int reg;                       \
 211         err |= __get_user(reg, &sc->e ##x);     \
 212         regs->r ## x = reg;                     \
 213 }
 214
 215 #define RELOAD_SEG(seg,mask)                                            \
 216         { unsigned int cur;                                             \
 217           unsigned short pre;                                           \
 218           err |= __get_user(pre, &sc->seg);                             \
 219           asm volatile("movl %%" #seg ",%0" : "=r" (cur));              \
 220           pre |= mask;                                                  \
 221           if (pre != cur) loadsegment(seg,pre); }
 222
 223         /* Reload fs and gs if they have changed in the signal handler.
 224            This does not handle long fs/gs base changes in the handler, but
 225            does not clobber them at least in the normal case. */
 226
 227         {
 228                 unsigned gs, oldgs;
 229                 err |= __get_user(gs, &sc->gs);
 230                 gs |= 3;
 231                 asm("movl %%gs,%0" : "=r" (oldgs));
 232                 if (gs != oldgs)
 233                 load_gs_index(gs);
 234         }
 235         RELOAD_SEG(fs,3);
 236         RELOAD_SEG(ds,3);
 237         RELOAD_SEG(es,3);
 238
 239         COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
 240         COPY(dx); COPY(cx); COPY(ip);
 241         /* Don't touch extended registers */
 242
 243         err |= __get_user(regs->cs, &sc->cs);
 244         regs->cs |= 3;
 245         err |= __get_user(regs->ss, &sc->ss);
 246         regs->ss |= 3;
 247
 248         {
 249                 unsigned int tmpflags;
 250                 err |= __get_user(tmpflags, &sc->eflags);
 251                 regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
 252                 regs->orig_rax = -1;            /* disable syscall checks */
 253         }
 254
 255         {
 256                 u32 tmp;
 257                 struct _fpstate_ia32 __user * buf;
 258                 err |= __get_user(tmp, &sc->fpstate);
 259                 buf = compat_ptr(tmp);
 260                 if (buf) {
 261                         if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
 262                                 goto badframe;
 263                         err |= restore_i387_ia32(current, buf, 0);
 264                 } else {
 265                         struct task_struct *me = current;
 266                         if (used_math()) {
 267                                 clear_fpu(me);
 268                                 clear_used_math();
 269                         }
 270                 }
 271         }
 272
 273         {
 274                 u32 tmp;
 275                 err |= __get_user(tmp, &sc->eax);
 276                 *peax = tmp;
 277         }
 278         return err;
 279
 280 badframe:
 281         return 1;
 282 }
 283
 284 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
 285 {
 286         struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8);
 287         sigset_t set;
 288         unsigned int eax;
 289
 290         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 291                 goto badframe;
 292         if (__get_user(set.sig[0], &frame->sc.oldmask)
 293             || (_COMPAT_NSIG_WORDS > 1
 294                 && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask,
 295                                     sizeof(frame->extramask))))
 296                 goto badframe;
 297
 298         sigdelsetmask(&set, ~_BLOCKABLE);
 299         spin_lock_irq(&current->sighand->siglock);
 300         current->blocked = set;
 301         recalc_sigpending();
 302         spin_unlock_irq(&current->sighand->siglock);
 303
 304         if (ia32_restore_sigcontext(regs, &frame->sc, &eax))
 305                 goto badframe;
 306         return eax;
 307
 308 badframe:
 309         signal_fault(regs, frame, "32bit sigreturn");
 310         return 0;
 311 }
 312
 313 asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
 314 {
 315         struct rt_sigframe __user *frame;
 316         sigset_t set;
 317         unsigned int eax;
 318         struct pt_regs tregs;
 319
 320         frame = (struct rt_sigframe __user *)(regs->rsp - 4);
 321
 322         if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
 323                 goto badframe;
 324         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 325                 goto badframe;
 326
 327         sigdelsetmask(&set, ~_BLOCKABLE);
 328         spin_lock_irq(&current->sighand->siglock);
 329         current->blocked = set;
 330         recalc_sigpending();
 331         spin_unlock_irq(&current->sighand->siglock);
 332
 333         if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
 334                 goto badframe;
 335
 336         tregs = *regs;
 337         if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
 338                 goto badframe;
 339
 340         return eax;
 341
 342 badframe:
 343         signal_fault(regs,frame,"32bit rt sigreturn");
 344         return 0;
 345 }
 346
 347 /*
 348  * Set up a signal frame.
 349  */
 350
 351 static int
 352 ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
 353                  struct pt_regs *regs, unsigned int mask)
 354 {
 355         int tmp, err = 0;
 356
 357         tmp = 0;
 358         __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
 359         err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
 360         __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
 361         err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
 362         __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
 363         err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
 364         __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
 365         err |= __put_user(tmp, (unsigned int __user *)&sc->es);
 366
 367         err |= __put_user((u32)regs->rdi, &sc->edi);
 368         err |= __put_user((u32)regs->rsi, &sc->esi);
 369         err |= __put_user((u32)regs->rbp, &sc->ebp);
 370         err |= __put_user((u32)regs->rsp, &sc->esp);
 371         err |= __put_user((u32)regs->rbx, &sc->ebx);
 372         err |= __put_user((u32)regs->rdx, &sc->edx);
 373         err |= __put_user((u32)regs->rcx, &sc->ecx);
 374         err |= __put_user((u32)regs->rax, &sc->eax);
 375         err |= __put_user((u32)regs->cs, &sc->cs);
 376         err |= __put_user((u32)regs->ss, &sc->ss);
 377         err |= __put_user(current->thread.trap_no, &sc->trapno);
 378         err |= __put_user(current->thread.error_code, &sc->err);
 379         err |= __put_user((u32)regs->rip, &sc->eip);
 380         err |= __put_user((u32)regs->eflags, &sc->eflags);
 381         err |= __put_user((u32)regs->rsp, &sc->esp_at_signal);
 382
 383         tmp = save_i387_ia32(current, fpstate, regs, 0);
 384         if (tmp < 0)
 385                 err = -EFAULT;
 386         else {
 387                 clear_used_math();
 388                 stts();
 389                 err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
 390                                         &sc->fpstate);
 391         }
 392
 393         /* non-iBCS2 extensions.. */
 394         err |= __put_user(mask, &sc->oldmask);
 395         err |= __put_user(current->thread.cr2, &sc->cr2);
 396
 397         return err;
 398 }
 399
 400 /*
 401  * Determine which stack to use..
 402  */
 403 static void __user *
 404 get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 405 {
 406         unsigned long rsp;
 407
 408         /* Default to using normal stack */
 409         rsp = regs->rsp;
 410
 411         /* This is the X/Open sanctioned signal stack switching.  */
 412         if (ka->sa.sa_flags & SA_ONSTACK) {
 413                 if (sas_ss_flags(rsp) == 0)
 414                         rsp = current->sas_ss_sp + current->sas_ss_size;
 415         }
 416
 417         /* This is the legacy signal stack switching. */
 418         else if ((regs->ss & 0xffff) != __USER_DS &&
 419                 !(ka->sa.sa_flags & SA_RESTORER) &&
 420                  ka->sa.sa_restorer) {
 421                 rsp = (unsigned long) ka->sa.sa_restorer;
 422         }
 423
 424         rsp -= frame_size;
 425         /* Align the stack pointer according to the i386 ABI,
 426          * i.e. so that on function entry ((sp + 4) & 15) == 0. */
 427         rsp = ((rsp + 4) & -16ul) - 4;
 428         return (void __user *) rsp;
 429 }
 430
 431 int ia32_setup_frame(int sig, struct k_sigaction *ka,
 432                      compat_sigset_t *set, struct pt_regs * regs)
 433 {
 434         struct sigframe __user *frame;
 435         int err = 0;
 436
 437         frame = get_sigframe(ka, regs, sizeof(*frame));
 438
 439         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 440                 goto give_sigsegv;
 441
 442         {
 443                 struct exec_domain *ed = current_thread_info()->exec_domain;
 444                 err |= __put_user((ed
 445                            && ed->signal_invmap
 446                            && sig < 32
 447                            ? ed->signal_invmap[sig]
 448                            : sig),
 449                           &frame->sig);
 450         }
 451         if (err)
 452                 goto give_sigsegv;
 453
 454         err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs,
 455                                         set->sig[0]);
 456         if (err)
 457                 goto give_sigsegv;
 458
 459         if (_COMPAT_NSIG_WORDS > 1) {
 460                 err |= __copy_to_user(frame->extramask, &set->sig[1],
 461                                       sizeof(frame->extramask));
 462         }
 463         if (err)
 464                 goto give_sigsegv;
 465
 466         /* Return stub is in 32bit vsyscall page */
 467         {
 468                 void __user *restorer = VSYSCALL32_SIGRETURN;
 469                 if (ka->sa.sa_flags & SA_RESTORER)
 470                         restorer = ka->sa.sa_restorer;
 471                 err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
 472         }
 473         /* These are actually not used anymore, but left because some
 474            gdb versions depend on them as a marker. */
 475         {
 476                 /* copy_to_user optimizes that into a single 8 byte store */
 477                 static const struct {
 478                         u16 poplmovl;
 479                         u32 val;
 480                         u16 int80;
 481                         u16 pad;
 482                 } __attribute__((packed)) code = {
 483                         0xb858,          /* popl %eax ; movl $...,%eax */
 484                         __NR_ia32_sigreturn,
 485                         0x80cd,         /* int $0x80 */
 486                         0,
 487                 };
 488                 err |= __copy_to_user(frame->retcode, &code, 8);
 489         }
 490         if (err)
 491                 goto give_sigsegv;
 492
 493         /* Set up registers for signal handler */
 494         regs->rsp = (unsigned long) frame;
 495         regs->rip = (unsigned long) ka->sa.sa_handler;
 496
 497         asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
 498         asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
 499
 500         regs->cs = __USER32_CS;
 501         regs->ss = __USER32_DS;
 502
 503         set_fs(USER_DS);
 504     regs->eflags &= ~TF_MASK;
 505     if (test_thread_flag(TIF_SINGLESTEP))
 506         ptrace_notify(SIGTRAP);
 507
 508 #if DEBUG_SIG
 509         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
 510                 current->comm, current->pid, frame, regs->rip, frame->pretcode);
 511 #endif
 512
 513         return 1;
 514
 515 give_sigsegv:
 516         force_sigsegv(sig, current);
 517         return 0;
 518 }
 519
 520 int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 521                         compat_sigset_t *set, struct pt_regs * regs)
 522 {
 523         struct rt_sigframe __user *frame;
 524         int err = 0;
 525
 526         frame = get_sigframe(ka, regs, sizeof(*frame));
 527
 528         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 529                 goto give_sigsegv;
 530
 531         {
 532                 struct exec_domain *ed = current_thread_info()->exec_domain;
 533                 err |= __put_user((ed
 534                            && ed->signal_invmap
 535                            && sig < 32
 536                            ? ed->signal_invmap[sig]
 537                            : sig),
 538                           &frame->sig);
 539         }
 540         err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
 541         err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
 542         err |= copy_siginfo_to_user32(&frame->info, info);
 543         if (err)
 544                 goto give_sigsegv;
 545
 546         /* Create the ucontext.  */
 547         err |= __put_user(0, &frame->uc.uc_flags);
 548         err |= __put_user(0, &frame->uc.uc_link);
 549         err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
 550         err |= __put_user(sas_ss_flags(regs->rsp),
 551                           &frame->uc.uc_stack.ss_flags);
 552         err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
 553         err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
 554                                 regs, set->sig[0]);
 555         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 556         if (err)
 557                 goto give_sigsegv;
 558
 559
 560         {
 561                 void __user *restorer = VSYSCALL32_RTSIGRETURN;
 562                 if (ka->sa.sa_flags & SA_RESTORER)
 563                         restorer = ka->sa.sa_restorer;
 564                 err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
 565         }
 566
 567         /* This is movl $,%eax ; int $0x80 */
 568         /* Not actually used anymore, but left because some gdb versions
 569            need it. */
 570         {
 571                 /* __copy_to_user optimizes that into a single 8 byte store */
 572                 static const struct {
 573                         u8 movl;
 574                         u32 val;
 575                         u16 int80;
 576                         u16 pad;
 577                         u8  pad2;
 578                 } __attribute__((packed)) code = {
 579                         0xb8,
 580                         __NR_ia32_rt_sigreturn,
 581                         0x80cd,
 582                         0,
 583                 };
 584                 err |= __copy_to_user(frame->retcode, &code, 8);
 585         }
 586         if (err)
 587                 goto give_sigsegv;
 588
 589         /* Set up registers for signal handler */
 590         regs->rsp = (unsigned long) frame;
 591         regs->rip = (unsigned long) ka->sa.sa_handler;
 592
 593         asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
 594         asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
 595
 596         regs->cs = __USER32_CS;
 597         regs->ss = __USER32_DS;
 598
 599         set_fs(USER_DS);
 600     regs->eflags &= ~TF_MASK;
 601     if (test_thread_flag(TIF_SINGLESTEP))
 602         ptrace_notify(SIGTRAP);
 603
 604 #if DEBUG_SIG
 605         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
 606                 current->comm, current->pid, frame, regs->rip, frame->pretcode);
 607 #endif
 608
 609         return 1;
 610
 611 give_sigsegv:
 612         force_sigsegv(sig, current);
 613         return 0;
 614 }