arch/sparc/kernel/signal_64.c

   1 /*
   2  *  arch/sparc64/kernel/signal.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
   6  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
   8  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   9  */
  10
  11 #ifdef CONFIG_COMPAT
  12 #include <linux/compat.h>       /* for compat_old_sigset_t */
  13 #endif
  14 #include <linux/sched.h>
  15 #include <linux/kernel.h>
  16 #include <linux/signal.h>
  17 #include <linux/errno.h>
  18 #include <linux/wait.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/tracehook.h>
  21 #include <linux/unistd.h>
  22 #include <linux/mm.h>
  23 #include <linux/tty.h>
  24 #include <linux/binfmts.h>
  25 #include <linux/bitops.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <asm/ptrace.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/fpumacro.h>
  31 #include <asm/uctx.h>
  32 #include <asm/siginfo.h>
  33 #include <asm/visasm.h>
  34
  35 #include "entry.h"
  36 #include "systbls.h"
  37 #include "sigutil.h"
  38
  39 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  40
  41 /* {set, get}context() needed for 64-bit SparcLinux userland. */
  42 asmlinkage void sparc64_set_context(struct pt_regs *regs)
  43 {
  44         struct ucontext __user *ucp = (struct ucontext __user *)
  45                 regs->u_regs[UREG_I0];
  46         mc_gregset_t __user *grp;
  47         unsigned long pc, npc, tstate;
  48         unsigned long fp, i7;
  49         unsigned char fenab;
  50         int err;
  51
  52         flush_user_windows();
  53         if (get_thread_wsaved()                                 ||
  54             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
  55             (!__access_ok(ucp, sizeof(*ucp))))
  56                 goto do_sigsegv;
  57         grp  = &ucp->uc_mcontext.mc_gregs;
  58         err  = __get_user(pc, &((*grp)[MC_PC]));
  59         err |= __get_user(npc, &((*grp)[MC_NPC]));
  60         if (err || ((pc | npc) & 3))
  61                 goto do_sigsegv;
  62         if (regs->u_regs[UREG_I1]) {
  63                 sigset_t set;
  64
  65                 if (_NSIG_WORDS == 1) {
  66                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
  67                                 goto do_sigsegv;
  68                 } else {
  69                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
  70                                 goto do_sigsegv;
  71                 }
  72                 sigdelsetmask(&set, ~_BLOCKABLE);
  73                 set_current_blocked(&set);
  74         }
  75         if (test_thread_flag(TIF_32BIT)) {
  76                 pc &= 0xffffffff;
  77                 npc &= 0xffffffff;
  78         }
  79         regs->tpc = pc;
  80         regs->tnpc = npc;
  81         err |= __get_user(regs->y, &((*grp)[MC_Y]));
  82         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
  83         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
  84         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
  85         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
  86         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
  87         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
  88         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
  89         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
  90         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
  91
  92         /* Skip %g7 as that's the thread register in userspace.  */
  93
  94         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
  95         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
  96         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
  97         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
  98         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
  99         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
 100         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
 101         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
 102
 103         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
 104         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
 105         err |= __put_user(fp,
 106               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 107         err |= __put_user(i7,
 108               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 109
 110         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
 111         if (fenab) {
 112                 unsigned long *fpregs = current_thread_info()->fpregs;
 113                 unsigned long fprs;
 114
 115                 fprs_write(0);
 116                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
 117                 if (fprs & FPRS_DL)
 118                         err |= copy_from_user(fpregs,
 119                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
 120                                               (sizeof(unsigned int) * 32));
 121                 if (fprs & FPRS_DU)
 122                         err |= copy_from_user(fpregs+16,
 123                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
 124                          (sizeof(unsigned int) * 32));
 125                 err |= __get_user(current_thread_info()->xfsr[0],
 126                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
 127                 err |= __get_user(current_thread_info()->gsr[0],
 128                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
 129                 regs->tstate &= ~TSTATE_PEF;
 130         }
 131         if (err)
 132                 goto do_sigsegv;
 133
 134         return;
 135 do_sigsegv:
 136         force_sig(SIGSEGV, current);
 137 }
 138
 139 asmlinkage void sparc64_get_context(struct pt_regs *regs)
 140 {
 141         struct ucontext __user *ucp = (struct ucontext __user *)
 142                 regs->u_regs[UREG_I0];
 143         mc_gregset_t __user *grp;
 144         mcontext_t __user *mcp;
 145         unsigned long fp, i7;
 146         unsigned char fenab;
 147         int err;
 148
 149         synchronize_user_stack();
 150         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
 151                 goto do_sigsegv;
 152
 153 #if 1
 154         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
 155 #else
 156         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
 157 #endif
 158
 159         mcp = &ucp->uc_mcontext;
 160         grp = &mcp->mc_gregs;
 161
 162         /* Skip over the trap instruction, first. */
 163         if (test_thread_flag(TIF_32BIT)) {
 164                 regs->tpc   = (regs->tnpc & 0xffffffff);
 165                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
 166         } else {
 167                 regs->tpc   = regs->tnpc;
 168                 regs->tnpc += 4;
 169         }
 170         err = 0;
 171         if (_NSIG_WORDS == 1)
 172                 err |= __put_user(current->blocked.sig[0],
 173                                   (unsigned long __user *)&ucp->uc_sigmask);
 174         else
 175                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
 176                                       sizeof(sigset_t));
 177
 178         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
 179         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
 180         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
 181         err |= __put_user(regs->y, &((*grp)[MC_Y]));
 182         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
 183         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
 184         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
 185         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
 186         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
 187         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
 188         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
 189         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
 190         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
 191         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
 192         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
 193         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
 194         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
 195         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
 196         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
 197
 198         err |= __get_user(fp,
 199                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 200         err |= __get_user(i7,
 201                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 202         err |= __put_user(fp, &(mcp->mc_fp));
 203         err |= __put_user(i7, &(mcp->mc_i7));
 204
 205         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
 206         if (fenab) {
 207                 unsigned long *fpregs = current_thread_info()->fpregs;
 208                 unsigned long fprs;
 209
 210                 fprs = current_thread_info()->fpsaved[0];
 211                 if (fprs & FPRS_DL)
 212                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
 213                                             (sizeof(unsigned int) * 32));
 214                 if (fprs & FPRS_DU)
 215                         err |= copy_to_user(
 216                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
 217                           (sizeof(unsigned int) * 32));
 218                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
 219                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
 220                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
 221         }
 222         if (err)
 223                 goto do_sigsegv;
 224
 225         return;
 226 do_sigsegv:
 227         force_sig(SIGSEGV, current);
 228 }
 229
 230 struct rt_signal_frame {
 231         struct sparc_stackf     ss;
 232         siginfo_t               info;
 233         struct pt_regs          regs;
 234         __siginfo_fpu_t __user  *fpu_save;
 235         stack_t                 stack;
 236         sigset_t                mask;
 237         __siginfo_rwin_t        *rwin_save;
 238 };
 239
 240 static long _sigpause_common(old_sigset_t set)
 241 {
 242         sigset_t blocked;
 243
 244         current->saved_sigmask = current->blocked;
 245
 246         set &= _BLOCKABLE;
 247         siginitset(&blocked, set);
 248         set_current_blocked(&blocked);
 249
 250         current->state = TASK_INTERRUPTIBLE;
 251         schedule();
 252
 253         set_restore_sigmask();
 254
 255         return -ERESTARTNOHAND;
 256 }
 257
 258 asmlinkage long sys_sigpause(unsigned int set)
 259 {
 260         return _sigpause_common(set);
 261 }
 262
 263 asmlinkage long sys_sigsuspend(old_sigset_t set)
 264 {
 265         return _sigpause_common(set);
 266 }
 267
 268 void do_rt_sigreturn(struct pt_regs *regs)
 269 {
 270         struct rt_signal_frame __user *sf;
 271         unsigned long tpc, tnpc, tstate;
 272         __siginfo_fpu_t __user *fpu_save;
 273         __siginfo_rwin_t __user *rwin_save;
 274         sigset_t set;
 275         int err;
 276
 277         /* Always make any pending restarted system calls return -EINTR */
 278         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 279
 280         synchronize_user_stack ();
 281         sf = (struct rt_signal_frame __user *)
 282                 (regs->u_regs [UREG_FP] + STACK_BIAS);
 283
 284         /* 1. Make sure we are not getting garbage from the user */
 285         if (((unsigned long) sf) & 3)
 286                 goto segv;
 287
 288         err = get_user(tpc, &sf->regs.tpc);
 289         err |= __get_user(tnpc, &sf->regs.tnpc);
 290         if (test_thread_flag(TIF_32BIT)) {
 291                 tpc &= 0xffffffff;
 292                 tnpc &= 0xffffffff;
 293         }
 294         err |= ((tpc | tnpc) & 3);
 295
 296         /* 2. Restore the state */
 297         err |= __get_user(regs->y, &sf->regs.y);
 298         err |= __get_user(tstate, &sf->regs.tstate);
 299         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
 300
 301         /* User can only change condition codes and %asi in %tstate. */
 302         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
 303         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
 304
 305         err |= __get_user(fpu_save, &sf->fpu_save);
 306         if (!err && fpu_save)
 307                 err |= restore_fpu_state(regs, fpu_save);
 308
 309         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 310         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
 311
 312         if (err)
 313                 goto segv;
 314
 315         err |= __get_user(rwin_save, &sf->rwin_save);
 316         if (!err && rwin_save) {
 317                 if (restore_rwin_state(rwin_save))
 318                         goto segv;
 319         }
 320
 321         regs->tpc = tpc;
 322         regs->tnpc = tnpc;
 323
 324         /* Prevent syscall restart.  */
 325         pt_regs_clear_syscall(regs);
 326
 327         sigdelsetmask(&set, ~_BLOCKABLE);
 328         set_current_blocked(&set);
 329         return;
 330 segv:
 331         force_sig(SIGSEGV, current);
 332 }
 333
 334 /* Checks if the fp is valid */
 335 static int invalid_frame_pointer(void __user *fp)
 336 {
 337         if (((unsigned long) fp) & 15)
 338                 return 1;
 339         return 0;
 340 }
 341
 342 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
 343 {
 344         unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
 345
 346         /*
 347          * If we are on the alternate signal stack and would overflow it, don't.
 348          * Return an always-bogus address instead so we will die with SIGSEGV.
 349          */
 350         if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
 351                 return (void __user *) -1L;
 352
 353         /* This is the X/Open sanctioned signal stack switching.  */
 354         if (ka->sa.sa_flags & SA_ONSTACK) {
 355                 if (sas_ss_flags(sp) == 0)
 356                         sp = current->sas_ss_sp + current->sas_ss_size;
 357         }
 358
 359         sp -= framesize;
 360
 361         /* Always align the stack frame.  This handles two cases.  First,
 362          * sigaltstack need not be mindful of platform specific stack
 363          * alignment.  Second, if we took this signal because the stack
 364          * is not aligned properly, we'd like to take the signal cleanly
 365          * and report that.
 366          */
 367         sp &= ~15UL;
 368
 369         return (void __user *) sp;
 370 }
 371
 372 static inline int
 373 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 374                int signo, sigset_t *oldset, siginfo_t *info)
 375 {
 376         struct rt_signal_frame __user *sf;
 377         int wsaved, err, sf_size;
 378         void __user *tail;
 379
 380         /* 1. Make sure everything is clean */
 381         synchronize_user_stack();
 382         save_and_clear_fpu();
 383
 384         wsaved = get_thread_wsaved();
 385
 386         sf_size = sizeof(struct rt_signal_frame);
 387         if (current_thread_info()->fpsaved[0] & FPRS_FEF)
 388                 sf_size += sizeof(__siginfo_fpu_t);
 389         if (wsaved)
 390                 sf_size += sizeof(__siginfo_rwin_t);
 391         sf = (struct rt_signal_frame __user *)
 392                 get_sigframe(ka, regs, sf_size);
 393
 394         if (invalid_frame_pointer (sf))
 395                 goto sigill;
 396
 397         tail = (sf + 1);
 398
 399         /* 2. Save the current process state */
 400         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
 401
 402         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
 403                 __siginfo_fpu_t __user *fpu_save = tail;
 404                 tail += sizeof(__siginfo_fpu_t);
 405                 err |= save_fpu_state(regs, fpu_save);
 406                 err |= __put_user((u64)fpu_save, &sf->fpu_save);
 407         } else {
 408                 err |= __put_user(0, &sf->fpu_save);
 409         }
 410         if (wsaved) {
 411                 __siginfo_rwin_t __user *rwin_save = tail;
 412                 tail += sizeof(__siginfo_rwin_t);
 413                 err |= save_rwin_state(wsaved, rwin_save);
 414                 err |= __put_user((u64)rwin_save, &sf->rwin_save);
 415                 set_thread_wsaved(0);
 416         } else {
 417                 err |= __put_user(0, &sf->rwin_save);
 418         }
 419
 420         /* Setup sigaltstack */
 421         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 422         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 423         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 424
 425         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
 426
 427         if (!wsaved) {
 428                 err |= copy_in_user((u64 __user *)sf,
 429                                     (u64 __user *)(regs->u_regs[UREG_FP] +
 430                                                    STACK_BIAS),
 431                                     sizeof(struct reg_window));
 432         } else {
 433                 struct reg_window *rp;
 434
 435                 rp = &current_thread_info()->reg_window[wsaved - 1];
 436                 err |= copy_to_user(sf, rp, sizeof(struct reg_window));
 437         }
 438         if (info)
 439                 err |= copy_siginfo_to_user(&sf->info, info);
 440         else {
 441                 err |= __put_user(signo, &sf->info.si_signo);
 442                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
 443         }
 444         if (err)
 445                 goto sigsegv;
 446
 447         /* 3. signal handler back-trampoline and parameters */
 448         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
 449         regs->u_regs[UREG_I0] = signo;
 450         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 451
 452         /* The sigcontext is passed in this way because of how it
 453          * is defined in GLIBC's /usr/include/bits/sigcontext.h
 454          * for sparc64.  It includes the 128 bytes of siginfo_t.
 455          */
 456         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 457
 458         /* 5. signal handler */
 459         regs->tpc = (unsigned long) ka->sa.sa_handler;
 460         regs->tnpc = (regs->tpc + 4);
 461         if (test_thread_flag(TIF_32BIT)) {
 462                 regs->tpc &= 0xffffffff;
 463                 regs->tnpc &= 0xffffffff;
 464         }
 465         /* 4. return to kernel instructions */
 466         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 467         return 0;
 468
 469 sigill:
 470         do_exit(SIGILL);
 471         return -EINVAL;
 472
 473 sigsegv:
 474         force_sigsegv(signo, current);
 475         return -EFAULT;
 476 }
 477
 478 static inline int handle_signal(unsigned long signr, struct k_sigaction *ka,
 479                                 siginfo_t *info,
 480                                 sigset_t *oldset, struct pt_regs *regs)
 481 {
 482         sigset_t blocked;
 483         int err;
 484
 485         err = setup_rt_frame(ka, regs, signr, oldset,
 486                              (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
 487         if (err)
 488                 return err;
 489         sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
 490         if (!(ka->sa.sa_flags & SA_NOMASK))
 491                 sigaddset(&blocked, signr);
 492         set_current_blocked(&blocked);
 493
 494         tracehook_signal_handler(signr, info, ka, regs, 0);
 495
 496         return 0;
 497 }
 498
 499 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 500                                    struct sigaction *sa)
 501 {
 502         switch (regs->u_regs[UREG_I0]) {
 503         case ERESTART_RESTARTBLOCK:
 504         case ERESTARTNOHAND:
 505         no_system_call_restart:
 506                 regs->u_regs[UREG_I0] = EINTR;
 507                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 508                 break;
 509         case ERESTARTSYS:
 510                 if (!(sa->sa_flags & SA_RESTART))
 511                         goto no_system_call_restart;
 512                 /* fallthrough */
 513         case ERESTARTNOINTR:
 514                 regs->u_regs[UREG_I0] = orig_i0;
 515                 regs->tpc -= 4;
 516                 regs->tnpc -= 4;
 517         }
 518 }
 519
 520 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 521  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 522  * mistake.
 523  */
 524 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 525 {
 526         struct k_sigaction ka;
 527         int restart_syscall;
 528         sigset_t *oldset;
 529         siginfo_t info;
 530         int signr;
 531
 532         if (pt_regs_is_syscall(regs) &&
 533             (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
 534                 restart_syscall = 1;
 535         } else
 536                 restart_syscall = 0;
 537
 538         if (current_thread_info()->status & TS_RESTORE_SIGMASK)
 539                 oldset = &current->saved_sigmask;
 540         else
 541                 oldset = &current->blocked;
 542
 543 #ifdef CONFIG_COMPAT
 544         if (test_thread_flag(TIF_32BIT)) {
 545                 extern void do_signal32(sigset_t *, struct pt_regs *,
 546                                         int restart_syscall,
 547                                         unsigned long orig_i0);
 548                 do_signal32(oldset, regs, restart_syscall, orig_i0);
 549                 return;
 550         }
 551 #endif
 552
 553         signr = get_signal_to_deliver(&info, &ka, regs, NULL);
 554
 555         /* If the debugger messes with the program counter, it clears
 556          * the software "in syscall" bit, directing us to not perform
 557          * a syscall restart.
 558          */
 559         if (restart_syscall && !pt_regs_is_syscall(regs))
 560                 restart_syscall = 0;
 561
 562         if (signr > 0) {
 563                 if (restart_syscall)
 564                         syscall_restart(orig_i0, regs, &ka.sa);
 565                 if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
 566                         /* A signal was successfully delivered; the saved
 567                          * sigmask will have been stored in the signal frame,
 568                          * and will be restored by sigreturn, so we can simply
 569                          * clear the TS_RESTORE_SIGMASK flag.
 570                          */
 571                         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 572                 }
 573                 return;
 574         }
 575         if (restart_syscall &&
 576             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 577              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 578              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 579                 /* replay the system call when we are done */
 580                 regs->u_regs[UREG_I0] = orig_i0;
 581                 regs->tpc -= 4;
 582                 regs->tnpc -= 4;
 583                 pt_regs_clear_syscall(regs);
 584         }
 585         if (restart_syscall &&
 586             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 587                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 588                 regs->tpc -= 4;
 589                 regs->tnpc -= 4;
 590                 pt_regs_clear_syscall(regs);
 591         }
 592
 593         /* If there's no signal to deliver, we just put the saved sigmask
 594          * back
 595          */
 596         if (current_thread_info()->status & TS_RESTORE_SIGMASK) {
 597                 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
 598                 set_current_blocked(&current->saved_sigmask);
 599         }
 600 }
 601
 602 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
 603 {
 604         if (thread_info_flags & _TIF_SIGPENDING)
 605                 do_signal(regs, orig_i0);
 606         if (thread_info_flags & _TIF_NOTIFY_RESUME) {
 607                 clear_thread_flag(TIF_NOTIFY_RESUME);
 608                 tracehook_notify_resume(regs);
 609                 if (current->replacement_session_keyring)
 610                         key_replace_session_keyring();
 611         }
 612 }
 613