arch/sparc/kernel/signal.c

   1 /*  linux/arch/sparc/kernel/signal.c
   2  *
   3  *  Copyright (C) 1991, 1992  Linus Torvalds
   4  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   5  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   6  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
   7  */
   8
   9 #include <linux/sched.h>
  10 #include <linux/kernel.h>
  11 #include <linux/signal.h>
  12 #include <linux/errno.h>
  13 #include <linux/wait.h>
  14 #include <linux/ptrace.h>
  15 #include <linux/unistd.h>
  16 #include <linux/mm.h>
  17 #include <linux/tty.h>
  18 #include <linux/smp.h>
  19 #include <linux/binfmts.h>      /* do_coredum */
  20 #include <linux/bitops.h>
  21
  22 #include <asm/uaccess.h>
  23 #include <asm/ptrace.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/cacheflush.h>     /* flush_sig_insns */
  27
  28 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  29
  30 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
  31                    void *fpqueue, unsigned long *fpqdepth);
  32 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
  33
  34 struct signal_frame {
  35         struct sparc_stackf     ss;
  36         __siginfo_t             info;
  37         __siginfo_fpu_t __user  *fpu_save;
  38         unsigned long           insns[2] __attribute__ ((aligned (8)));
  39         unsigned int            extramask[_NSIG_WORDS - 1];
  40         unsigned int            extra_size; /* Should be 0 */
  41         __siginfo_fpu_t         fpu_state;
  42 };
  43
  44 struct rt_signal_frame {
  45         struct sparc_stackf     ss;
  46         siginfo_t               info;
  47         struct pt_regs          regs;
  48         sigset_t                mask;
  49         __siginfo_fpu_t __user  *fpu_save;
  50         unsigned int            insns[2];
  51         stack_t                 stack;
  52         unsigned int            extra_size; /* Should be 0 */
  53         __siginfo_fpu_t         fpu_state;
  54 };
  55
  56 /* Align macros */
  57 #define SF_ALIGNEDSZ  (((sizeof(struct signal_frame) + 7) & (~7)))
  58 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
  59
  60 static int _sigpause_common(old_sigset_t set)
  61 {
  62         set &= _BLOCKABLE;
  63         spin_lock_irq(&current->sighand->siglock);
  64         current->saved_sigmask = current->blocked;
  65         siginitset(&current->blocked, set);
  66         recalc_sigpending();
  67         spin_unlock_irq(&current->sighand->siglock);
  68
  69         current->state = TASK_INTERRUPTIBLE;
  70         schedule();
  71         set_thread_flag(TIF_RESTORE_SIGMASK);
  72
  73         return -ERESTARTNOHAND;
  74 }
  75
  76 asmlinkage int sys_sigsuspend(old_sigset_t set)
  77 {
  78         return _sigpause_common(set);
  79 }
  80
  81 static inline int
  82 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
  83 {
  84         int err;
  85 #ifdef CONFIG_SMP
  86         if (test_tsk_thread_flag(current, TIF_USEDFPU))
  87                 regs->psr &= ~PSR_EF;
  88 #else
  89         if (current == last_task_used_math) {
  90                 last_task_used_math = NULL;
  91                 regs->psr &= ~PSR_EF;
  92         }
  93 #endif
  94         set_used_math();
  95         clear_tsk_thread_flag(current, TIF_USEDFPU);
  96
  97         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
  98                 return -EFAULT;
  99
 100         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
 101                                (sizeof(unsigned long) * 32));
 102         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
 103         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 104         if (current->thread.fpqdepth != 0)
 105                 err |= __copy_from_user(&current->thread.fpqueue[0],
 106                                         &fpu->si_fpqueue[0],
 107                                         ((sizeof(unsigned long) +
 108                                         (sizeof(unsigned long *)))*16));
 109         return err;
 110 }
 111
 112 asmlinkage void do_sigreturn(struct pt_regs *regs)
 113 {
 114         struct signal_frame __user *sf;
 115         unsigned long up_psr, pc, npc;
 116         sigset_t set;
 117         __siginfo_fpu_t __user *fpu_save;
 118         int err;
 119
 120         /* Always make any pending restarted system calls return -EINTR */
 121         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 122
 123         synchronize_user_stack();
 124
 125         sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
 126
 127         /* 1. Make sure we are not getting garbage from the user */
 128         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
 129                 goto segv_and_exit;
 130
 131         if (((unsigned long) sf) & 3)
 132                 goto segv_and_exit;
 133
 134         err = __get_user(pc,  &sf->info.si_regs.pc);
 135         err |= __get_user(npc, &sf->info.si_regs.npc);
 136
 137         if ((pc | npc) & 3)
 138                 goto segv_and_exit;
 139
 140         /* 2. Restore the state */
 141         up_psr = regs->psr;
 142         err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
 143
 144         /* User can only change condition codes and FPU enabling in %psr. */
 145         regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
 146                   | (regs->psr & (PSR_ICC | PSR_EF));
 147
 148         err |= __get_user(fpu_save, &sf->fpu_save);
 149
 150         if (fpu_save)
 151                 err |= restore_fpu_state(regs, fpu_save);
 152
 153         /* This is pretty much atomic, no amount locking would prevent
 154          * the races which exist anyways.
 155          */
 156         err |= __get_user(set.sig[0], &sf->info.si_mask);
 157         err |= __copy_from_user(&set.sig[1], &sf->extramask,
 158                                 (_NSIG_WORDS-1) * sizeof(unsigned int));
 159
 160         if (err)
 161                 goto segv_and_exit;
 162
 163         sigdelsetmask(&set, ~_BLOCKABLE);
 164         spin_lock_irq(&current->sighand->siglock);
 165         current->blocked = set;
 166         recalc_sigpending();
 167         spin_unlock_irq(&current->sighand->siglock);
 168         return;
 169
 170 segv_and_exit:
 171         force_sig(SIGSEGV, current);
 172 }
 173
 174 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 175 {
 176         struct rt_signal_frame __user *sf;
 177         unsigned int psr, pc, npc;
 178         __siginfo_fpu_t __user *fpu_save;
 179         mm_segment_t old_fs;
 180         sigset_t set;
 181         stack_t st;
 182         int err;
 183
 184         synchronize_user_stack();
 185         sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
 186         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
 187             (((unsigned long) sf) & 0x03))
 188                 goto segv;
 189
 190         err = __get_user(pc, &sf->regs.pc);
 191         err |= __get_user(npc, &sf->regs.npc);
 192         err |= ((pc | npc) & 0x03);
 193
 194         err |= __get_user(regs->y, &sf->regs.y);
 195         err |= __get_user(psr, &sf->regs.psr);
 196
 197         err |= __copy_from_user(&regs->u_regs[UREG_G1],
 198                                 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
 199
 200         regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
 201
 202         err |= __get_user(fpu_save, &sf->fpu_save);
 203
 204         if (fpu_save)
 205                 err |= restore_fpu_state(regs, fpu_save);
 206         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 207
 208         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 209
 210         if (err)
 211                 goto segv;
 212
 213         regs->pc = pc;
 214         regs->npc = npc;
 215
 216         /* It is more difficult to avoid calling this function than to
 217          * call it and ignore errors.
 218          */
 219         old_fs = get_fs();
 220         set_fs(KERNEL_DS);
 221         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
 222         set_fs(old_fs);
 223
 224         sigdelsetmask(&set, ~_BLOCKABLE);
 225         spin_lock_irq(&current->sighand->siglock);
 226         current->blocked = set;
 227         recalc_sigpending();
 228         spin_unlock_irq(&current->sighand->siglock);
 229         return;
 230 segv:
 231         force_sig(SIGSEGV, current);
 232 }
 233
 234 /* Checks if the fp is valid */
 235 static inline int invalid_frame_pointer(void __user *fp, int fplen)
 236 {
 237         if ((((unsigned long) fp) & 7) ||
 238             !__access_ok((unsigned long)fp, fplen) ||
 239             ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
 240              ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
 241                 return 1;
 242
 243         return 0;
 244 }
 245
 246 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
 247 {
 248         unsigned long sp;
 249
 250         sp = regs->u_regs[UREG_FP];
 251
 252         /* This is the X/Open sanctioned signal stack switching.  */
 253         if (sa->sa_flags & SA_ONSTACK) {
 254                 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
 255                         sp = current->sas_ss_sp + current->sas_ss_size;
 256         }
 257         return (void __user *)(sp - framesize);
 258 }
 259
 260 static inline int
 261 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 262 {
 263         int err = 0;
 264 #ifdef CONFIG_SMP
 265         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
 266                 put_psr(get_psr() | PSR_EF);
 267                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 268                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 269                 regs->psr &= ~(PSR_EF);
 270                 clear_tsk_thread_flag(current, TIF_USEDFPU);
 271         }
 272 #else
 273         if (current == last_task_used_math) {
 274                 put_psr(get_psr() | PSR_EF);
 275                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 276                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 277                 last_task_used_math = NULL;
 278                 regs->psr &= ~(PSR_EF);
 279         }
 280 #endif
 281         err |= __copy_to_user(&fpu->si_float_regs[0],
 282                               &current->thread.float_regs[0],
 283                               (sizeof(unsigned long) * 32));
 284         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
 285         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 286         if (current->thread.fpqdepth != 0)
 287                 err |= __copy_to_user(&fpu->si_fpqueue[0],
 288                                       &current->thread.fpqueue[0],
 289                                       ((sizeof(unsigned long) +
 290                                       (sizeof(unsigned long *)))*16));
 291         clear_used_math();
 292         return err;
 293 }
 294
 295 static void setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 296                         int signo, sigset_t *oldset)
 297 {
 298         struct signal_frame __user *sf;
 299         int sigframe_size, err;
 300
 301         /* 1. Make sure everything is clean */
 302         synchronize_user_stack();
 303
 304         sigframe_size = SF_ALIGNEDSZ;
 305         if (!used_math())
 306                 sigframe_size -= sizeof(__siginfo_fpu_t);
 307
 308         sf = (struct signal_frame __user *)
 309                 get_sigframe(&ka->sa, regs, sigframe_size);
 310
 311         if (invalid_frame_pointer(sf, sigframe_size))
 312                 goto sigill_and_return;
 313
 314         if (current_thread_info()->w_saved != 0)
 315                 goto sigill_and_return;
 316
 317         /* 2. Save the current process state */
 318         err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
 319
 320         err |= __put_user(0, &sf->extra_size);
 321
 322         if (used_math()) {
 323                 err |= save_fpu_state(regs, &sf->fpu_state);
 324                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 325         } else {
 326                 err |= __put_user(0, &sf->fpu_save);
 327         }
 328
 329         err |= __put_user(oldset->sig[0], &sf->info.si_mask);
 330         err |= __copy_to_user(sf->extramask, &oldset->sig[1],
 331                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 332         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 333                               sizeof(struct reg_window));
 334         if (err)
 335                 goto sigsegv;
 336
 337         /* 3. signal handler back-trampoline and parameters */
 338         regs->u_regs[UREG_FP] = (unsigned long) sf;
 339         regs->u_regs[UREG_I0] = signo;
 340         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 341         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 342
 343         /* 4. signal handler */
 344         regs->pc = (unsigned long) ka->sa.sa_handler;
 345         regs->npc = (regs->pc + 4);
 346
 347         /* 5. return to kernel instructions */
 348         if (ka->ka_restorer)
 349                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 350         else {
 351                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 352
 353                 /* mov __NR_sigreturn, %g1 */
 354                 err |= __put_user(0x821020d8, &sf->insns[0]);
 355
 356                 /* t 0x10 */
 357                 err |= __put_user(0x91d02010, &sf->insns[1]);
 358                 if (err)
 359                         goto sigsegv;
 360
 361                 /* Flush instruction space. */
 362                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 363         }
 364         return;
 365
 366 sigill_and_return:
 367         do_exit(SIGILL);
 368 sigsegv:
 369         force_sigsegv(signo, current);
 370 }
 371
 372 static void setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 373                            int signo, sigset_t *oldset, siginfo_t *info)
 374 {
 375         struct rt_signal_frame __user *sf;
 376         int sigframe_size;
 377         unsigned int psr;
 378         int err;
 379
 380         synchronize_user_stack();
 381         sigframe_size = RT_ALIGNEDSZ;
 382         if (!used_math())
 383                 sigframe_size -= sizeof(__siginfo_fpu_t);
 384         sf = (struct rt_signal_frame __user *)
 385                 get_sigframe(&ka->sa, regs, sigframe_size);
 386         if (invalid_frame_pointer(sf, sigframe_size))
 387                 goto sigill;
 388         if (current_thread_info()->w_saved != 0)
 389                 goto sigill;
 390
 391         err  = __put_user(regs->pc, &sf->regs.pc);
 392         err |= __put_user(regs->npc, &sf->regs.npc);
 393         err |= __put_user(regs->y, &sf->regs.y);
 394         psr = regs->psr;
 395         if (used_math())
 396                 psr |= PSR_EF;
 397         err |= __put_user(psr, &sf->regs.psr);
 398         err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
 399         err |= __put_user(0, &sf->extra_size);
 400
 401         if (psr & PSR_EF) {
 402                 err |= save_fpu_state(regs, &sf->fpu_state);
 403                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 404         } else {
 405                 err |= __put_user(0, &sf->fpu_save);
 406         }
 407         err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
 408
 409         /* Setup sigaltstack */
 410         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 411         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 412         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 413
 414         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 415                               sizeof(struct reg_window));
 416
 417         err |= copy_siginfo_to_user(&sf->info, info);
 418
 419         if (err)
 420                 goto sigsegv;
 421
 422         regs->u_regs[UREG_FP] = (unsigned long) sf;
 423         regs->u_regs[UREG_I0] = signo;
 424         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 425         regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
 426
 427         regs->pc = (unsigned long) ka->sa.sa_handler;
 428         regs->npc = (regs->pc + 4);
 429
 430         if (ka->ka_restorer)
 431                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 432         else {
 433                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 434
 435                 /* mov __NR_sigreturn, %g1 */
 436                 err |= __put_user(0x821020d8, &sf->insns[0]);
 437
 438                 /* t 0x10 */
 439                 err |= __put_user(0x91d02010, &sf->insns[1]);
 440                 if (err)
 441                         goto sigsegv;
 442
 443                 /* Flush instruction space. */
 444                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 445         }
 446         return;
 447
 448 sigill:
 449         do_exit(SIGILL);
 450 sigsegv:
 451         force_sigsegv(signo, current);
 452 }
 453
 454 static inline void
 455 handle_signal(unsigned long signr, struct k_sigaction *ka,
 456               siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
 457 {
 458         if (ka->sa.sa_flags & SA_SIGINFO)
 459                 setup_rt_frame(ka, regs, signr, oldset, info);
 460         else
 461                 setup_frame(ka, regs, signr, oldset);
 462
 463         spin_lock_irq(&current->sighand->siglock);
 464         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 465         if (!(ka->sa.sa_flags & SA_NOMASK))
 466                 sigaddset(&current->blocked, signr);
 467         recalc_sigpending();
 468         spin_unlock_irq(&current->sighand->siglock);
 469 }
 470
 471 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 472                                    struct sigaction *sa)
 473 {
 474         switch(regs->u_regs[UREG_I0]) {
 475         case ERESTART_RESTARTBLOCK:
 476         case ERESTARTNOHAND:
 477         no_system_call_restart:
 478                 regs->u_regs[UREG_I0] = EINTR;
 479                 regs->psr |= PSR_C;
 480                 break;
 481         case ERESTARTSYS:
 482                 if (!(sa->sa_flags & SA_RESTART))
 483                         goto no_system_call_restart;
 484                 /* fallthrough */
 485         case ERESTARTNOINTR:
 486                 regs->u_regs[UREG_I0] = orig_i0;
 487                 regs->pc -= 4;
 488                 regs->npc -= 4;
 489         }
 490 }
 491
 492 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 493  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 494  * mistake.
 495  */
 496 asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
 497 {
 498         siginfo_t info;
 499         struct sparc_deliver_cookie cookie;
 500         struct k_sigaction ka;
 501         int signr;
 502         sigset_t *oldset;
 503
 504         cookie.restart_syscall = restart_syscall;
 505         cookie.orig_i0 = orig_i0;
 506
 507         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 508                 oldset = &current->saved_sigmask;
 509         else
 510                 oldset = &current->blocked;
 511
 512         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
 513         if (signr > 0) {
 514                 if (cookie.restart_syscall)
 515                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
 516                 handle_signal(signr, &ka, &info, oldset, regs);
 517
 518                 /* a signal was successfully delivered; the saved
 519                  * sigmask will have been stored in the signal frame,
 520                  * and will be restored by sigreturn, so we can simply
 521                  * clear the TIF_RESTORE_SIGMASK flag.
 522                  */
 523                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
 524                         clear_thread_flag(TIF_RESTORE_SIGMASK);
 525                 return;
 526         }
 527         if (cookie.restart_syscall &&
 528             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 529              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 530              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 531                 /* replay the system call when we are done */
 532                 regs->u_regs[UREG_I0] = cookie.orig_i0;
 533                 regs->pc -= 4;
 534                 regs->npc -= 4;
 535         }
 536         if (cookie.restart_syscall &&
 537             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 538                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 539                 regs->pc -= 4;
 540                 regs->npc -= 4;
 541         }
 542
 543         /* if there's no signal to deliver, we just put the saved sigmask
 544          * back
 545          */
 546         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 547                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 548                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 549         }
 550 }
 551
 552 asmlinkage int
 553 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
 554                 unsigned long sp)
 555 {
 556         int ret = -EFAULT;
 557
 558         /* First see if old state is wanted. */
 559         if (ossptr) {
 560                 if (put_user(current->sas_ss_sp + current->sas_ss_size,
 561                              &ossptr->the_stack) ||
 562                     __put_user(on_sig_stack(sp), &ossptr->cur_status))
 563                         goto out;
 564         }
 565
 566         /* Now see if we want to update the new state. */
 567         if (ssptr) {
 568                 char *ss_sp;
 569
 570                 if (get_user(ss_sp, &ssptr->the_stack))
 571                         goto out;
 572                 /* If the current stack was set with sigaltstack, don't
 573                    swap stacks while we are on it.  */
 574                 ret = -EPERM;
 575                 if (current->sas_ss_sp && on_sig_stack(sp))
 576                         goto out;
 577
 578                 /* Since we don't know the extent of the stack, and we don't
 579                    track onstack-ness, but rather calculate it, we must
 580                    presume a size.  Ho hum this interface is lossy.  */
 581                 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
 582                 current->sas_ss_size = SIGSTKSZ;
 583         }
 584         ret = 0;
 585 out:
 586         return ret;
 587 }
 588
 589 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
 590 {
 591         struct sparc_deliver_cookie *cp = cookie;
 592
 593         if (cp->restart_syscall &&
 594             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 595              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 596              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 597                 /* replay the system call when we are done */
 598                 regs->u_regs[UREG_I0] = cp->orig_i0;
 599                 regs->pc -= 4;
 600                 regs->npc -= 4;
 601                 cp->restart_syscall = 0;
 602         }
 603
 604         if (cp->restart_syscall &&
 605             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 606                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 607                 regs->pc -= 4;
 608                 regs->npc -= 4;
 609                 cp->restart_syscall = 0;
 610         }
 611 }