LXR linux/arch/sparc/kernel/signal

   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#include <linux/context_tracking.h>
  27
  28#include <linux/uaccess.h>
  29#include <asm/ptrace.h>
  30#include <asm/pgtable.h>
  31#include <asm/fpumacro.h>
  32#include <asm/uctx.h>
  33#include <asm/siginfo.h>
  34#include <asm/visasm.h>
  35#include <asm/switch_to.h>
  36#include <asm/cacheflush.h>
  37
  38#include "sigutil.h"
  39#include "systbls.h"
  40#include "kernel.h"
  41#include "entry.h"
  42
  43/* {set, get}context() needed for 64-bit SparcLinux userland. */
  44asmlinkage void sparc64_set_context(struct pt_regs *regs)
  45{
  46        struct ucontext __user *ucp = (struct ucontext __user *)
  47                regs->u_regs[UREG_I0];
  48        enum ctx_state prev_state = exception_enter();
  49        mc_gregset_t __user *grp;
  50        unsigned long pc, npc, tstate;
  51        unsigned long fp, i7;
  52        unsigned char fenab;
  53        int err;
  54
  55        synchronize_user_stack();
  56        if (get_thread_wsaved()                                 ||
  57            (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
  58            (!__access_ok(ucp, sizeof(*ucp))))
  59                goto do_sigsegv;
  60        grp  = &ucp->uc_mcontext.mc_gregs;
  61        err  = __get_user(pc, &((*grp)[MC_PC]));
  62        err |= __get_user(npc, &((*grp)[MC_NPC]));
  63        if (err || ((pc | npc) & 3))
  64                goto do_sigsegv;
  65        if (regs->u_regs[UREG_I1]) {
  66                sigset_t set;
  67
  68                if (_NSIG_WORDS == 1) {
  69                        if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
  70                                goto do_sigsegv;
  71                } else {
  72                        if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
  73                                goto do_sigsegv;
  74                }
  75                set_current_blocked(&set);
  76        }
  77        if (test_thread_flag(TIF_32BIT)) {
  78                pc &= 0xffffffff;
  79                npc &= 0xffffffff;
  80        }
  81        regs->tpc = pc;
  82        regs->tnpc = npc;
  83        err |= __get_user(regs->y, &((*grp)[MC_Y]));
  84        err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
  85        regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
  86        regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
  87        err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
  88        err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
  89        err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
  90        err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
  91        err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
  92        err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
  93
  94        /* Skip %g7 as that's the thread register in userspace.  */
  95
  96        err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
  97        err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
  98        err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
  99        err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
 100        err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
 101        err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
 102        err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
 103        err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
 104
 105        err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
 106        err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
 107        err |= __put_user(fp,
 108              (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 109        err |= __put_user(i7,
 110              (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 111
 112        err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
 113        if (fenab) {
 114                unsigned long *fpregs = current_thread_info()->fpregs;
 115                unsigned long fprs;
 116                
 117                fprs_write(0);
 118                err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
 119                if (fprs & FPRS_DL)
 120                        err |= copy_from_user(fpregs,
 121                                              &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
 122                                              (sizeof(unsigned int) * 32));
 123                if (fprs & FPRS_DU)
 124                        err |= copy_from_user(fpregs+16,
 125                         ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
 126                         (sizeof(unsigned int) * 32));
 127                err |= __get_user(current_thread_info()->xfsr[0],
 128                                  &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
 129                err |= __get_user(current_thread_info()->gsr[0],
 130                                  &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
 131                regs->tstate &= ~TSTATE_PEF;
 132        }
 133        if (err)
 134                goto do_sigsegv;
 135out:
 136        exception_exit(prev_state);
 137        return;
 138do_sigsegv:
 139        force_sig(SIGSEGV, current);
 140        goto out;
 141}
 142
 143asmlinkage void sparc64_get_context(struct pt_regs *regs)
 144{
 145        struct ucontext __user *ucp = (struct ucontext __user *)
 146                regs->u_regs[UREG_I0];
 147        enum ctx_state prev_state = exception_enter();
 148        mc_gregset_t __user *grp;
 149        mcontext_t __user *mcp;
 150        unsigned long fp, i7;
 151        unsigned char fenab;
 152        int err;
 153
 154        synchronize_user_stack();
 155        if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
 156                goto do_sigsegv;
 157
 158#if 1
 159        fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
 160#else
 161        fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
 162#endif
 163                
 164        mcp = &ucp->uc_mcontext;
 165        grp = &mcp->mc_gregs;
 166
 167        /* Skip over the trap instruction, first. */
 168        if (test_thread_flag(TIF_32BIT)) {
 169                regs->tpc   = (regs->tnpc & 0xffffffff);
 170                regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
 171        } else {
 172                regs->tpc   = regs->tnpc;
 173                regs->tnpc += 4;
 174        }
 175        err = 0;
 176        if (_NSIG_WORDS == 1)
 177                err |= __put_user(current->blocked.sig[0],
 178                                  (unsigned long __user *)&ucp->uc_sigmask);
 179        else
 180                err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
 181                                      sizeof(sigset_t));
 182
 183        err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
 184        err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
 185        err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
 186        err |= __put_user(regs->y, &((*grp)[MC_Y]));
 187        err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
 188        err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
 189        err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
 190        err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
 191        err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
 192        err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
 193        err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
 194        err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
 195        err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
 196        err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
 197        err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
 198        err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
 199        err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
 200        err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
 201        err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
 202
 203        err |= __get_user(fp,
 204                 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 205        err |= __get_user(i7,
 206                 (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 207        err |= __put_user(fp, &(mcp->mc_fp));
 208        err |= __put_user(i7, &(mcp->mc_i7));
 209
 210        err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
 211        if (fenab) {
 212                unsigned long *fpregs = current_thread_info()->fpregs;
 213                unsigned long fprs;
 214                
 215                fprs = current_thread_info()->fpsaved[0];
 216                if (fprs & FPRS_DL)
 217                        err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
 218                                            (sizeof(unsigned int) * 32));
 219                if (fprs & FPRS_DU)
 220                        err |= copy_to_user(
 221                          ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
 222                          (sizeof(unsigned int) * 32));
 223                err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
 224                err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
 225                err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
 226        }
 227        if (err)
 228                goto do_sigsegv;
 229out:
 230        exception_exit(prev_state);
 231        return;
 232do_sigsegv:
 233        force_sig(SIGSEGV, current);
 234        goto out;
 235}
 236
 237/* Checks if the fp is valid.  We always build rt signal frames which
 238 * are 16-byte aligned, therefore we can always enforce that the
 239 * restore frame has that property as well.
 240 */
 241static bool invalid_frame_pointer(void __user *fp)
 242{
 243        if (((unsigned long) fp) & 15)
 244                return true;
 245        return false;
 246}
 247
 248struct rt_signal_frame {
 249        struct sparc_stackf     ss;
 250        siginfo_t               info;
 251        struct pt_regs          regs;
 252        __siginfo_fpu_t __user  *fpu_save;
 253        stack_t                 stack;
 254        sigset_t                mask;
 255        __siginfo_rwin_t        *rwin_save;
 256};
 257
 258void do_rt_sigreturn(struct pt_regs *regs)
 259{
 260        unsigned long tpc, tnpc, tstate, ufp;
 261        struct rt_signal_frame __user *sf;
 262        __siginfo_fpu_t __user *fpu_save;
 263        __siginfo_rwin_t __user *rwin_save;
 264        sigset_t set;
 265        int err;
 266
 267        /* Always make any pending restarted system calls return -EINTR */
 268        current->restart_block.fn = do_no_restart_syscall;
 269
 270        synchronize_user_stack ();
 271        sf = (struct rt_signal_frame __user *)
 272                (regs->u_regs [UREG_FP] + STACK_BIAS);
 273
 274        /* 1. Make sure we are not getting garbage from the user */
 275        if (invalid_frame_pointer(sf))
 276                goto segv;
 277
 278        if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
 279                goto segv;
 280
 281        if ((ufp + STACK_BIAS) & 0x7)
 282                goto segv;
 283
 284        err = __get_user(tpc, &sf->regs.tpc);
 285        err |= __get_user(tnpc, &sf->regs.tnpc);
 286        if (test_thread_flag(TIF_32BIT)) {
 287                tpc &= 0xffffffff;
 288                tnpc &= 0xffffffff;
 289        }
 290        err |= ((tpc | tnpc) & 3);
 291
 292        /* 2. Restore the state */
 293        err |= __get_user(regs->y, &sf->regs.y);
 294        err |= __get_user(tstate, &sf->regs.tstate);
 295        err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
 296
 297        /* User can only change condition codes and %asi in %tstate. */
 298        regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
 299        regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
 300
 301        err |= __get_user(fpu_save, &sf->fpu_save);
 302        if (!err && fpu_save)
 303                err |= restore_fpu_state(regs, fpu_save);
 304
 305        err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 306        err |= restore_altstack(&sf->stack);
 307        if (err)
 308                goto segv;
 309
 310        err |= __get_user(rwin_save, &sf->rwin_save);
 311        if (!err && rwin_save) {
 312                if (restore_rwin_state(rwin_save))
 313                        goto segv;
 314        }
 315
 316        regs->tpc = tpc;
 317        regs->tnpc = tnpc;
 318
 319        /* Prevent syscall restart.  */
 320        pt_regs_clear_syscall(regs);
 321
 322        set_current_blocked(&set);
 323        return;
 324segv:
 325        force_sig(SIGSEGV, current);
 326}
 327
 328static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
 329{
 330        unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
 331
 332        /*
 333         * If we are on the alternate signal stack and would overflow it, don't.
 334         * Return an always-bogus address instead so we will die with SIGSEGV.
 335         */
 336        if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
 337                return (void __user *) -1L;
 338
 339        /* This is the X/Open sanctioned signal stack switching.  */
 340        sp = sigsp(sp, ksig) - framesize;
 341
 342        /* Always align the stack frame.  This handles two cases.  First,
 343         * sigaltstack need not be mindful of platform specific stack
 344         * alignment.  Second, if we took this signal because the stack
 345         * is not aligned properly, we'd like to take the signal cleanly
 346         * and report that.
 347         */
 348        sp &= ~15UL;
 349
 350        return (void __user *) sp;
 351}
 352
 353static inline int
 354setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs)
 355{
 356        struct rt_signal_frame __user *sf;
 357        int wsaved, err, sf_size;
 358        void __user *tail;
 359
 360        /* 1. Make sure everything is clean */
 361        synchronize_user_stack();
 362        save_and_clear_fpu();
 363        
 364        wsaved = get_thread_wsaved();
 365
 366        sf_size = sizeof(struct rt_signal_frame);
 367        if (current_thread_info()->fpsaved[0] & FPRS_FEF)
 368                sf_size += sizeof(__siginfo_fpu_t);
 369        if (wsaved)
 370                sf_size += sizeof(__siginfo_rwin_t);
 371        sf = (struct rt_signal_frame __user *)
 372                get_sigframe(ksig, regs, sf_size);
 373
 374        if (invalid_frame_pointer (sf)) {
 375                do_exit(SIGILL);        /* won't return, actually */
 376                return -EINVAL;
 377        }
 378
 379        tail = (sf + 1);
 380
 381        /* 2. Save the current process state */
 382        err = copy_to_user(&sf->regs, regs, sizeof (*regs));
 383
 384        if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
 385                __siginfo_fpu_t __user *fpu_save = tail;
 386                tail += sizeof(__siginfo_fpu_t);
 387                err |= save_fpu_state(regs, fpu_save);
 388                err |= __put_user((u64)fpu_save, &sf->fpu_save);
 389        } else {
 390                err |= __put_user(0, &sf->fpu_save);
 391        }
 392        if (wsaved) {
 393                __siginfo_rwin_t __user *rwin_save = tail;
 394                tail += sizeof(__siginfo_rwin_t);
 395                err |= save_rwin_state(wsaved, rwin_save);
 396                err |= __put_user((u64)rwin_save, &sf->rwin_save);
 397                set_thread_wsaved(0);
 398        } else {
 399                err |= __put_user(0, &sf->rwin_save);
 400        }
 401        
 402        /* Setup sigaltstack */
 403        err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
 404
 405        err |= copy_to_user(&sf->mask, sigmask_to_save(), sizeof(sigset_t));
 406
 407        if (!wsaved) {
 408                err |= copy_in_user((u64 __user *)sf,
 409                                    (u64 __user *)(regs->u_regs[UREG_FP] +
 410                                                   STACK_BIAS),
 411                                    sizeof(struct reg_window));
 412        } else {
 413                struct reg_window *rp;
 414
 415                rp = &current_thread_info()->reg_window[wsaved - 1];
 416                err |= copy_to_user(sf, rp, sizeof(struct reg_window));
 417        }
 418        if (ksig->ka.sa.sa_flags & SA_SIGINFO)
 419                err |= copy_siginfo_to_user(&sf->info, &ksig->info);
 420        else {
 421                err |= __put_user(ksig->sig, &sf->info.si_signo);
 422                err |= __put_user(SI_NOINFO, &sf->info.si_code);
 423        }
 424        if (err)
 425                return err;
 426        
 427        /* 3. signal handler back-trampoline and parameters */
 428        regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
 429        regs->u_regs[UREG_I0] = ksig->sig;
 430        regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 431
 432        /* The sigcontext is passed in this way because of how it
 433         * is defined in GLIBC's /usr/include/bits/sigcontext.h
 434         * for sparc64.  It includes the 128 bytes of siginfo_t.
 435         */
 436        regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 437
 438        /* 5. signal handler */
 439        regs->tpc = (unsigned long) ksig->ka.sa.sa_handler;
 440        regs->tnpc = (regs->tpc + 4);
 441        if (test_thread_flag(TIF_32BIT)) {
 442                regs->tpc &= 0xffffffff;
 443                regs->tnpc &= 0xffffffff;
 444        }
 445        /* 4. return to kernel instructions */
 446        regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
 447        return 0;
 448}
 449
 450static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 451                                   struct sigaction *sa)
 452{
 453        switch (regs->u_regs[UREG_I0]) {
 454        case ERESTART_RESTARTBLOCK:
 455        case ERESTARTNOHAND:
 456        no_system_call_restart:
 457                regs->u_regs[UREG_I0] = EINTR;
 458                regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 459                break;
 460        case ERESTARTSYS:
 461                if (!(sa->sa_flags & SA_RESTART))
 462                        goto no_system_call_restart;
 463                /* fallthrough */
 464        case ERESTARTNOINTR:
 465                regs->u_regs[UREG_I0] = orig_i0;
 466                regs->tpc -= 4;
 467                regs->tnpc -= 4;
 468        }
 469}
 470
 471/* Note that 'init' is a special process: it doesn't get signals it doesn't
 472 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 473 * mistake.
 474 */
 475static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 476{
 477        struct ksignal ksig;
 478        int restart_syscall;
 479        bool has_handler;
 480        
 481        /* It's a lot of work and synchronization to add a new ptrace
 482         * register for GDB to save and restore in order to get
 483         * orig_i0 correct for syscall restarts when debugging.
 484         *
 485         * Although it should be the case that most of the global
 486         * registers are volatile across a system call, glibc already
 487         * depends upon that fact that we preserve them.  So we can't
 488         * just use any global register to save away the orig_i0 value.
 489         *
 490         * In particular %g2, %g3, %g4, and %g5 are all assumed to be
 491         * preserved across a system call trap by various pieces of
 492         * code in glibc.
 493         *
 494         * %g7 is used as the "thread register".   %g6 is not used in
 495         * any fixed manner.  %g6 is used as a scratch register and
 496         * a compiler temporary, but it's value is never used across
 497         * a system call.  Therefore %g6 is usable for orig_i0 storage.
 498         */
 499        if (pt_regs_is_syscall(regs) &&
 500            (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)))
 501                regs->u_regs[UREG_G6] = orig_i0;
 502
 503#ifdef CONFIG_COMPAT
 504        if (test_thread_flag(TIF_32BIT)) {
 505                do_signal32(regs);
 506                return;
 507        }
 508#endif  
 509
 510        has_handler = get_signal(&ksig);
 511
 512        restart_syscall = 0;
 513        if (pt_regs_is_syscall(regs) &&
 514            (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY))) {
 515                restart_syscall = 1;
 516                orig_i0 = regs->u_regs[UREG_G6];
 517        }
 518
 519        if (has_handler) {
 520                if (restart_syscall)
 521                        syscall_restart(orig_i0, regs, &ksig.ka.sa);
 522                signal_setup_done(setup_rt_frame(&ksig, regs), &ksig, 0);
 523        } else {
 524                if (restart_syscall) {
 525                        switch (regs->u_regs[UREG_I0]) {
 526                        case ERESTARTNOHAND:
 527                        case ERESTARTSYS:
 528                        case ERESTARTNOINTR:
 529                                /* replay the system call when we are done */
 530                                regs->u_regs[UREG_I0] = orig_i0;
 531                                regs->tpc -= 4;
 532                                regs->tnpc -= 4;
 533                                pt_regs_clear_syscall(regs);
 534                        case ERESTART_RESTARTBLOCK:
 535                                regs->u_regs[UREG_G1] = __NR_restart_syscall;
 536                                regs->tpc -= 4;
 537                                regs->tnpc -= 4;
 538                                pt_regs_clear_syscall(regs);
 539                        }
 540                }
 541                restore_saved_sigmask();
 542        }
 543}
 544
 545void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
 546{
 547        user_exit();
 548        if (thread_info_flags & _TIF_UPROBE)
 549                uprobe_notify_resume(regs);
 550        if (thread_info_flags & _TIF_SIGPENDING)
 551                do_signal(regs, orig_i0);
 552        if (thread_info_flags & _TIF_NOTIFY_RESUME) {
 553                clear_thread_flag(TIF_NOTIFY_RESUME);
 554                tracehook_notify_resume(regs);
 555        }
 556        user_enter();
 557}
 558
 559