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 ptr_to_u32(x) ((u32)(u64)(x))   /* avoid gcc warning */
  39
  40 #define DEBUG_SIG 0
  41
  42 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  43
  44 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
  45 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
  46
  47 int ia32_copy_siginfo_to_user(siginfo_t32 __user *to, siginfo_t *from)
  48 {
  49         int err;
  50         if (!access_ok (VERIFY_WRITE, to, sizeof(siginfo_t32)))
  51                 return -EFAULT;
  52
  53         /* If you change siginfo_t structure, please make sure that
  54                    this code is fixed accordingly.
  55                    It should never copy any pad contained in the structure
  56                    to avoid security leaks, but must copy the generic
  57                    3 ints plus the relevant union member.  */
  58                 err = __put_user(from->si_signo, &to->si_signo);
  59                 err |= __put_user(from->si_errno, &to->si_errno);
  60         err |= __put_user((short)from->si_code, &to->si_code);
  61
  62         if (from->si_code < 0) {
  63                 err |= __put_user(from->si_pid, &to->si_pid);
  64                 err |= __put_user(from->si_uid, &to->si_uid);
  65                 err |= __put_user((u32)(u64)from->si_ptr, &to->si_ptr);
  66         } else {
  67                 /* First 32bits of unions are always present:
  68                  * si_pid === si_band === si_tid === si_addr(LS half) */
  69                 err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
  70                 switch (from->si_code >> 16) {
  71                 case __SI_FAULT >> 16:
  72                         break;
  73                 case __SI_CHLD >> 16:
  74                         err |= __put_user(from->si_utime, &to->si_utime);
  75                         err |= __put_user(from->si_stime, &to->si_stime);
  76                         err |= __put_user(from->si_status, &to->si_status);
  77                 default:
  78                 case __SI_KILL >> 16:
  79                         err |= __put_user(from->si_uid, &to->si_uid);
  80                         break;
  81                 case __SI_POLL >> 16:
  82                         err |= __put_user(from->si_fd, &to->si_fd);
  83                         break;
  84                 case __SI_TIMER >> 16:
  85                         err |= __put_user(from->si_overrun, &to->si_overrun);
  86                         err |= __put_user((u32)(u64)from->si_ptr, &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 ia32_copy_siginfo_from_user(siginfo_t *to, siginfo_t32 __user *from)
  99 {
 100         int err;
 101         u32 ptr32;
 102         if (!access_ok (VERIFY_READ, from, sizeof(siginfo_t32)))
 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((u32)(u64)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         struct siginfo32 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 (verify_area(VERIFY_READ, buf, sizeof(*buf)))
 262                                 goto badframe;
 263                         err |= restore_i387_ia32(current, buf, 0);
 264                 }
 265         }
 266
 267         {
 268                 u32 tmp;
 269                 err |= __get_user(tmp, &sc->eax);
 270                 *peax = tmp;
 271         }
 272         return err;
 273
 274 badframe:
 275         return 1;
 276 }
 277
 278 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
 279 {
 280         struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8);
 281         sigset_t set;
 282         unsigned int eax;
 283
 284         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
 285                 goto badframe;
 286         if (__get_user(set.sig[0], &frame->sc.oldmask)
 287             || (_COMPAT_NSIG_WORDS > 1
 288                 && __copy_from_user((((char *) &set.sig) + 4), &frame->extramask,
 289                                     sizeof(frame->extramask))))
 290                 goto badframe;
 291
 292         sigdelsetmask(&set, ~_BLOCKABLE);
 293         spin_lock_irq(&current->sighand->siglock);
 294         current->blocked = set;
 295         recalc_sigpending();
 296         spin_unlock_irq(&current->sighand->siglock);
 297
 298         if (ia32_restore_sigcontext(regs, &frame->sc, &eax))
 299                 goto badframe;
 300         return eax;
 301
 302 badframe:
 303         signal_fault(regs, frame, "32bit sigreturn");
 304         return 0;
 305 }
 306
 307 asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
 308 {
 309         struct rt_sigframe __user *frame;
 310         sigset_t set;
 311         unsigned int eax;
 312         struct pt_regs tregs;
 313
 314         frame = (struct rt_sigframe __user *)(regs->rsp - 4);
 315
 316         if (verify_area(VERIFY_READ, frame, sizeof(*frame)))
 317                 goto badframe;
 318         if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
 319                 goto badframe;
 320
 321         sigdelsetmask(&set, ~_BLOCKABLE);
 322         spin_lock_irq(&current->sighand->siglock);
 323         current->blocked = set;
 324         recalc_sigpending();
 325         spin_unlock_irq(&current->sighand->siglock);
 326
 327         if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
 328                 goto badframe;
 329
 330         tregs = *regs;
 331         if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
 332                 goto badframe;
 333
 334         return eax;
 335
 336 badframe:
 337         signal_fault(regs,frame,"32bit rt sigreturn");
 338         return 0;
 339 }
 340
 341 /*
 342  * Set up a signal frame.
 343  */
 344
 345 static int
 346 ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
 347                  struct pt_regs *regs, unsigned int mask)
 348 {
 349         int tmp, err = 0;
 350         u32 eflags;
 351
 352         tmp = 0;
 353         __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
 354         err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
 355         __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
 356         err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
 357         __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
 358         err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
 359         __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
 360         err |= __put_user(tmp, (unsigned int __user *)&sc->es);
 361
 362         err |= __put_user((u32)regs->rdi, &sc->edi);
 363         err |= __put_user((u32)regs->rsi, &sc->esi);
 364         err |= __put_user((u32)regs->rbp, &sc->ebp);
 365         err |= __put_user((u32)regs->rsp, &sc->esp);
 366         err |= __put_user((u32)regs->rbx, &sc->ebx);
 367         err |= __put_user((u32)regs->rdx, &sc->edx);
 368         err |= __put_user((u32)regs->rcx, &sc->ecx);
 369         err |= __put_user((u32)regs->rax, &sc->eax);
 370         err |= __put_user((u32)regs->cs, &sc->cs);
 371         err |= __put_user((u32)regs->ss, &sc->ss);
 372         err |= __put_user(current->thread.trap_no, &sc->trapno);
 373         err |= __put_user(current->thread.error_code, &sc->err);
 374         err |= __put_user((u32)regs->rip, &sc->eip);
 375         eflags = regs->eflags;
 376         if (current->ptrace & PT_PTRACED) {
 377                 eflags &= ~TF_MASK;
 378         }
 379         err |= __put_user((u32)eflags, &sc->eflags);
 380         err |= __put_user((u32)regs->rsp, &sc->esp_at_signal);
 381
 382         tmp = save_i387_ia32(current, fpstate, regs, 0);
 383         if (tmp < 0)
 384           err = -EFAULT;
 385         else {
 386                 current->used_math = 0;
 387                 stts();
 388           err |= __put_user((u32)(u64)(tmp ? fpstate : NULL), &sc->fpstate);
 389         }
 390
 391         /* non-iBCS2 extensions.. */
 392         err |= __put_user(mask, &sc->oldmask);
 393         err |= __put_user(current->thread.cr2, &sc->cr2);
 394
 395         return err;
 396 }
 397
 398 /*
 399  * Determine which stack to use..
 400  */
 401 static void __user *
 402 get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 403 {
 404         unsigned long rsp;
 405
 406         /* Default to using normal stack */
 407         rsp = regs->rsp;
 408
 409         /* This is the X/Open sanctioned signal stack switching.  */
 410         if (ka->sa.sa_flags & SA_ONSTACK) {
 411                 if (sas_ss_flags(rsp) == 0)
 412                         rsp = current->sas_ss_sp + current->sas_ss_size;
 413         }
 414
 415         /* This is the legacy signal stack switching. */
 416         else if ((regs->ss & 0xffff) != __USER_DS &&
 417                 !(ka->sa.sa_flags & SA_RESTORER) &&
 418                  ka->sa.sa_restorer) {
 419                 rsp = (unsigned long) ka->sa.sa_restorer;
 420         }
 421
 422         return (void __user *)((rsp - frame_size) & -8UL);
 423 }
 424
 425 void ia32_setup_frame(int sig, struct k_sigaction *ka,
 426                         compat_sigset_t *set, struct pt_regs * regs)
 427 {
 428         struct sigframe __user *frame;
 429         int err = 0;
 430
 431         frame = get_sigframe(ka, regs, sizeof(*frame));
 432
 433         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 434                 goto give_sigsegv;
 435
 436         {
 437                 struct exec_domain *ed = current_thread_info()->exec_domain;
 438         err |= __put_user((ed
 439                            && ed->signal_invmap
 440                            && sig < 32
 441                            ? ed->signal_invmap[sig]
 442                            : sig),
 443                           &frame->sig);
 444         }
 445         if (err)
 446                 goto give_sigsegv;
 447
 448         err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
 449         if (err)
 450                 goto give_sigsegv;
 451
 452         if (_COMPAT_NSIG_WORDS > 1) {
 453                 err |= __copy_to_user(frame->extramask, &set->sig[1],
 454                                       sizeof(frame->extramask));
 455         }
 456         if (err)
 457                 goto give_sigsegv;
 458
 459         /* Return stub is in 32bit vsyscall page */
 460         {
 461                 void __user *restorer = VSYSCALL32_SIGRETURN;
 462                 if (ka->sa.sa_flags & SA_RESTORER)
 463                         restorer = ka->sa.sa_restorer;
 464                 err |= __put_user(ptr_to_u32(restorer), &frame->pretcode);
 465         }
 466         /* These are actually not used anymore, but left because some
 467            gdb versions depend on them as a marker. */
 468         {
 469                 /* copy_to_user optimizes that into a single 8 byte store */
 470                 static const struct {
 471                         u16 poplmovl;
 472                         u32 val;
 473                         u16 int80;
 474                         u16 pad;
 475                 } __attribute__((packed)) code = {
 476                         0xb858,          /* popl %eax ; movl $...,%eax */
 477                         __NR_ia32_sigreturn,
 478                         0x80cd,         /* int $0x80 */
 479                         0,
 480                 };
 481                 err |= __copy_to_user(frame->retcode, &code, 8);
 482         }
 483         if (err)
 484                 goto give_sigsegv;
 485
 486         /* Set up registers for signal handler */
 487         regs->rsp = (unsigned long) frame;
 488         regs->rip = (unsigned long) ka->sa.sa_handler;
 489
 490         asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
 491         asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
 492
 493         regs->cs = __USER32_CS;
 494         regs->ss = __USER32_DS;
 495
 496         set_fs(USER_DS);
 497         if (regs->eflags & TF_MASK) {
 498                 if (current->ptrace & PT_PTRACED) {
 499                         ptrace_notify(SIGTRAP);
 500                 } else {
 501                         regs->eflags &= ~TF_MASK;
 502                 }
 503         }
 504
 505 #if DEBUG_SIG
 506         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
 507                 current->comm, current->pid, frame, regs->rip, frame->pretcode);
 508 #endif
 509
 510         return;
 511
 512 give_sigsegv:
 513         force_sigsegv(sig, current);
 514 }
 515
 516 void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 517                            compat_sigset_t *set, struct pt_regs * regs)
 518 {
 519         struct rt_sigframe __user *frame;
 520         int err = 0;
 521
 522         frame = get_sigframe(ka, regs, sizeof(*frame));
 523
 524         if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
 525                 goto give_sigsegv;
 526
 527
 528         {
 529                 struct exec_domain *ed = current_thread_info()->exec_domain;
 530         err |= __put_user((ed
 531                            && ed->signal_invmap
 532                            && sig < 32
 533                            ? ed->signal_invmap[sig]
 534                            : sig),
 535                           &frame->sig);
 536         }
 537         err |= __put_user((u32)(u64)&frame->info, &frame->pinfo);
 538         err |= __put_user((u32)(u64)&frame->uc, &frame->puc);
 539         err |= ia32_copy_siginfo_to_user(&frame->info, info);
 540         if (err)
 541                 goto give_sigsegv;
 542
 543         /* Create the ucontext.  */
 544         err |= __put_user(0, &frame->uc.uc_flags);
 545         err |= __put_user(0, &frame->uc.uc_link);
 546         err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
 547         err |= __put_user(sas_ss_flags(regs->rsp),
 548                           &frame->uc.uc_stack.ss_flags);
 549         err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
 550         err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
 551                                 regs, set->sig[0]);
 552         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 553         if (err)
 554                 goto give_sigsegv;
 555
 556
 557         {
 558                 void __user *restorer = VSYSCALL32_RTSIGRETURN;
 559                 if (ka->sa.sa_flags & SA_RESTORER)
 560                         restorer = ka->sa.sa_restorer;
 561                 err |= __put_user(ptr_to_u32(restorer), &frame->pretcode);
 562         }
 563
 564         /* This is movl $,%eax ; int $0x80 */
 565         /* Not actually used anymore, but left because some gdb versions
 566            need it. */
 567         {
 568                 /* __copy_to_user optimizes that into a single 8 byte store */
 569                 static const struct {
 570                         u8 movl;
 571                         u32 val;
 572                         u16 int80;
 573                         u16 pad;
 574                         u8  pad2;
 575                 } __attribute__((packed)) code = {
 576                         0xb8,
 577                         __NR_ia32_rt_sigreturn,
 578                         0x80cd,
 579                         0,
 580                 };
 581                 err |= __copy_to_user(frame->retcode, &code, 8);
 582         }
 583         if (err)
 584                 goto give_sigsegv;
 585
 586         /* Set up registers for signal handler */
 587         regs->rsp = (unsigned long) frame;
 588         regs->rip = (unsigned long) ka->sa.sa_handler;
 589
 590         asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
 591         asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
 592
 593         regs->cs = __USER32_CS;
 594         regs->ss = __USER32_DS;
 595
 596         set_fs(USER_DS);
 597         if (regs->eflags & TF_MASK) {
 598                 if (current->ptrace & PT_PTRACED) {
 599                         ptrace_notify(SIGTRAP);
 600                 } else {
 601                         regs->eflags &= ~TF_MASK;
 602                 }
 603         }
 604
 605 #if DEBUG_SIG
 606         printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
 607                 current->comm, current->pid, frame, regs->rip, frame->pretcode);
 608 #endif
 609
 610         return;
 611
 612 give_sigsegv:
 613         force_sigsegv(sig, current);
 614 }
 615