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   1 /*  $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
   2  *  arch/sparc64/kernel/signal.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   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_SPARC32_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/unistd.h>
  21 #include <linux/mm.h>
  22 #include <linux/tty.h>
  23 #include <linux/smp_lock.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/svr4.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
  36 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  37
  38 /* {set, get}context() needed for 64-bit SparcLinux userland. */
  39 asmlinkage void sparc64_set_context(struct pt_regs *regs)
  40 {
  41         struct ucontext __user *ucp = (struct ucontext __user *)
  42                 regs->u_regs[UREG_I0];
  43         mc_gregset_t __user *grp;
  44         unsigned long pc, npc, tstate;
  45         unsigned long fp, i7;
  46         unsigned char fenab;
  47         int err;
  48
  49         flush_user_windows();
  50         if (get_thread_wsaved()                                 ||
  51             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
  52             (!__access_ok(ucp, sizeof(*ucp))))
  53                 goto do_sigsegv;
  54         grp  = &ucp->uc_mcontext.mc_gregs;
  55         err  = __get_user(pc, &((*grp)[MC_PC]));
  56         err |= __get_user(npc, &((*grp)[MC_NPC]));
  57         if (err || ((pc | npc) & 3))
  58                 goto do_sigsegv;
  59         if (regs->u_regs[UREG_I1]) {
  60                 sigset_t set;
  61
  62                 if (_NSIG_WORDS == 1) {
  63                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
  64                                 goto do_sigsegv;
  65                 } else {
  66                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
  67                                 goto do_sigsegv;
  68                 }
  69                 sigdelsetmask(&set, ~_BLOCKABLE);
  70                 spin_lock_irq(&current->sighand->siglock);
  71                 current->blocked = set;
  72                 recalc_sigpending();
  73                 spin_unlock_irq(&current->sighand->siglock);
  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         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
  92         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
  93         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
  94         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
  95         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
  96         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
  97         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
  98         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
  99         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
 100
 101         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
 102         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
 103         err |= __put_user(fp,
 104               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 105         err |= __put_user(i7,
 106               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 107
 108         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
 109         if (fenab) {
 110                 unsigned long *fpregs = current_thread_info()->fpregs;
 111                 unsigned long fprs;
 112
 113                 fprs_write(0);
 114                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
 115                 if (fprs & FPRS_DL)
 116                         err |= copy_from_user(fpregs,
 117                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
 118                                               (sizeof(unsigned int) * 32));
 119                 if (fprs & FPRS_DU)
 120                         err |= copy_from_user(fpregs+16,
 121                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
 122                          (sizeof(unsigned int) * 32));
 123                 err |= __get_user(current_thread_info()->xfsr[0],
 124                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
 125                 err |= __get_user(current_thread_info()->gsr[0],
 126                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
 127                 regs->tstate &= ~TSTATE_PEF;
 128         }
 129         if (err)
 130                 goto do_sigsegv;
 131
 132         return;
 133 do_sigsegv:
 134         force_sig(SIGSEGV, current);
 135 }
 136
 137 asmlinkage void sparc64_get_context(struct pt_regs *regs)
 138 {
 139         struct ucontext __user *ucp = (struct ucontext __user *)
 140                 regs->u_regs[UREG_I0];
 141         mc_gregset_t __user *grp;
 142         mcontext_t __user *mcp;
 143         unsigned long fp, i7;
 144         unsigned char fenab;
 145         int err;
 146
 147         synchronize_user_stack();
 148         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
 149                 goto do_sigsegv;
 150
 151 #if 1
 152         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
 153 #else
 154         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
 155 #endif
 156
 157         mcp = &ucp->uc_mcontext;
 158         grp = &mcp->mc_gregs;
 159
 160         /* Skip over the trap instruction, first. */
 161         if (test_thread_flag(TIF_32BIT)) {
 162                 regs->tpc   = (regs->tnpc & 0xffffffff);
 163                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
 164         } else {
 165                 regs->tpc   = regs->tnpc;
 166                 regs->tnpc += 4;
 167         }
 168         err = 0;
 169         if (_NSIG_WORDS == 1)
 170                 err |= __put_user(current->blocked.sig[0],
 171                                   (unsigned long __user *)&ucp->uc_sigmask);
 172         else
 173                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
 174                                       sizeof(sigset_t));
 175
 176         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
 177         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
 178         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
 179         err |= __put_user(regs->y, &((*grp)[MC_Y]));
 180         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
 181         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
 182         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
 183         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
 184         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
 185         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
 186         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
 187         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
 188         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
 189         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
 190         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
 191         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
 192         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
 193         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
 194         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
 195
 196         err |= __get_user(fp,
 197                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 198         err |= __get_user(i7,
 199                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 200         err |= __put_user(fp, &(mcp->mc_fp));
 201         err |= __put_user(i7, &(mcp->mc_i7));
 202
 203         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
 204         if (fenab) {
 205                 unsigned long *fpregs = current_thread_info()->fpregs;
 206                 unsigned long fprs;
 207
 208                 fprs = current_thread_info()->fpsaved[0];
 209                 if (fprs & FPRS_DL)
 210                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
 211                                             (sizeof(unsigned int) * 32));
 212                 if (fprs & FPRS_DU)
 213                         err |= copy_to_user(
 214                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
 215                           (sizeof(unsigned int) * 32));
 216                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
 217                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
 218                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
 219         }
 220         if (err)
 221                 goto do_sigsegv;
 222
 223         return;
 224 do_sigsegv:
 225         force_sig(SIGSEGV, current);
 226 }
 227
 228 struct rt_signal_frame {
 229         struct sparc_stackf     ss;
 230         siginfo_t               info;
 231         struct pt_regs          regs;
 232         __siginfo_fpu_t __user  *fpu_save;
 233         stack_t                 stack;
 234         sigset_t                mask;
 235         __siginfo_fpu_t         fpu_state;
 236 };
 237
 238 /* Align macros */
 239 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 240
 241 static long _sigpause_common(old_sigset_t set)
 242 {
 243         set &= _BLOCKABLE;
 244         spin_lock_irq(&current->sighand->siglock);
 245         current->saved_sigmask = current->blocked;
 246         siginitset(&current->blocked, set);
 247         recalc_sigpending();
 248         spin_unlock_irq(&current->sighand->siglock);
 249
 250         current->state = TASK_INTERRUPTIBLE;
 251         schedule();
 252         set_thread_flag(TIF_RESTORE_SIGMASK);
 253         return -ERESTARTNOHAND;
 254 }
 255
 256 asmlinkage long sys_sigpause(unsigned int set)
 257 {
 258         return _sigpause_common(set);
 259 }
 260
 261 asmlinkage long sys_sigsuspend(old_sigset_t set)
 262 {
 263         return _sigpause_common(set);
 264 }
 265
 266 static inline int
 267 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 268 {
 269         unsigned long *fpregs = current_thread_info()->fpregs;
 270         unsigned long fprs;
 271         int err;
 272
 273         err = __get_user(fprs, &fpu->si_fprs);
 274         fprs_write(0);
 275         regs->tstate &= ~TSTATE_PEF;
 276         if (fprs & FPRS_DL)
 277                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
 278                                (sizeof(unsigned int) * 32));
 279         if (fprs & FPRS_DU)
 280                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
 281                                (sizeof(unsigned int) * 32));
 282         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 283         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 284         current_thread_info()->fpsaved[0] |= fprs;
 285         return err;
 286 }
 287
 288 void do_rt_sigreturn(struct pt_regs *regs)
 289 {
 290         struct rt_signal_frame __user *sf;
 291         unsigned long tpc, tnpc, tstate;
 292         __siginfo_fpu_t __user *fpu_save;
 293         mm_segment_t old_fs;
 294         sigset_t set;
 295         stack_t st;
 296         int err;
 297
 298         /* Always make any pending restarted system calls return -EINTR */
 299         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 300
 301         synchronize_user_stack ();
 302         sf = (struct rt_signal_frame __user *)
 303                 (regs->u_regs [UREG_FP] + STACK_BIAS);
 304
 305         /* 1. Make sure we are not getting garbage from the user */
 306         if (((unsigned long) sf) & 3)
 307                 goto segv;
 308
 309         err = get_user(tpc, &sf->regs.tpc);
 310         err |= __get_user(tnpc, &sf->regs.tnpc);
 311         if (test_thread_flag(TIF_32BIT)) {
 312                 tpc &= 0xffffffff;
 313                 tnpc &= 0xffffffff;
 314         }
 315         err |= ((tpc | tnpc) & 3);
 316
 317         /* 2. Restore the state */
 318         err |= __get_user(regs->y, &sf->regs.y);
 319         err |= __get_user(tstate, &sf->regs.tstate);
 320         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
 321
 322         /* User can only change condition codes and %asi in %tstate. */
 323         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
 324         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
 325
 326         err |= __get_user(fpu_save, &sf->fpu_save);
 327         if (fpu_save)
 328                 err |= restore_fpu_state(regs, &sf->fpu_state);
 329
 330         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 331         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 332
 333         if (err)
 334                 goto segv;
 335
 336         regs->tpc = tpc;
 337         regs->tnpc = tnpc;
 338
 339         /* It is more difficult to avoid calling this function than to
 340            call it and ignore errors.  */
 341         old_fs = get_fs();
 342         set_fs(KERNEL_DS);
 343         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
 344         set_fs(old_fs);
 345
 346         sigdelsetmask(&set, ~_BLOCKABLE);
 347         spin_lock_irq(&current->sighand->siglock);
 348         current->blocked = set;
 349         recalc_sigpending();
 350         spin_unlock_irq(&current->sighand->siglock);
 351         return;
 352 segv:
 353         force_sig(SIGSEGV, current);
 354 }
 355
 356 /* Checks if the fp is valid */
 357 static int invalid_frame_pointer(void __user *fp, int fplen)
 358 {
 359         if (((unsigned long) fp) & 7)
 360                 return 1;
 361         return 0;
 362 }
 363
 364 static inline int
 365 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 366 {
 367         unsigned long *fpregs = (unsigned long *)(regs+1);
 368         unsigned long fprs;
 369         int err = 0;
 370
 371         fprs = current_thread_info()->fpsaved[0];
 372         if (fprs & FPRS_DL)
 373                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
 374                                     (sizeof(unsigned int) * 32));
 375         if (fprs & FPRS_DU)
 376                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
 377                                     (sizeof(unsigned int) * 32));
 378         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 379         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 380         err |= __put_user(fprs, &fpu->si_fprs);
 381
 382         return err;
 383 }
 384
 385 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
 386 {
 387         unsigned long sp;
 388
 389         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
 390
 391         /* This is the X/Open sanctioned signal stack switching.  */
 392         if (ka->sa.sa_flags & SA_ONSTACK) {
 393                 if (!on_sig_stack(sp) &&
 394                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
 395                         sp = current->sas_ss_sp + current->sas_ss_size;
 396         }
 397         return (void __user *)(sp - framesize);
 398 }
 399
 400 static inline void
 401 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 402                int signo, sigset_t *oldset, siginfo_t *info)
 403 {
 404         struct rt_signal_frame __user *sf;
 405         int sigframe_size, err;
 406
 407         /* 1. Make sure everything is clean */
 408         synchronize_user_stack();
 409         save_and_clear_fpu();
 410
 411         sigframe_size = RT_ALIGNEDSZ;
 412         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
 413                 sigframe_size -= sizeof(__siginfo_fpu_t);
 414
 415         sf = (struct rt_signal_frame __user *)
 416                 get_sigframe(ka, regs, sigframe_size);
 417
 418         if (invalid_frame_pointer (sf, sigframe_size))
 419                 goto sigill;
 420
 421         if (get_thread_wsaved() != 0)
 422                 goto sigill;
 423
 424         /* 2. Save the current process state */
 425         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
 426
 427         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
 428                 err |= save_fpu_state(regs, &sf->fpu_state);
 429                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
 430         } else {
 431                 err |= __put_user(0, &sf->fpu_save);
 432         }
 433
 434         /* Setup sigaltstack */
 435         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 436         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 437         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 438
 439         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
 440
 441         err |= copy_in_user((u64 __user *)sf,
 442                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
 443                             sizeof(struct reg_window));
 444
 445         if (info)
 446                 err |= copy_siginfo_to_user(&sf->info, info);
 447         else {
 448                 err |= __put_user(signo, &sf->info.si_signo);
 449                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
 450         }
 451         if (err)
 452                 goto sigsegv;
 453
 454         /* 3. signal handler back-trampoline and parameters */
 455         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
 456         regs->u_regs[UREG_I0] = signo;
 457         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 458
 459         /* The sigcontext is passed in this way because of how it
 460          * is defined in GLIBC's /usr/include/bits/sigcontext.h
 461          * for sparc64.  It includes the 128 bytes of siginfo_t.
 462          */
 463         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 464
 465         /* 5. signal handler */
 466         regs->tpc = (unsigned long) ka->sa.sa_handler;
 467         regs->tnpc = (regs->tpc + 4);
 468         if (test_thread_flag(TIF_32BIT)) {
 469                 regs->tpc &= 0xffffffff;
 470                 regs->tnpc &= 0xffffffff;
 471         }
 472         /* 4. return to kernel instructions */
 473         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 474         return;
 475
 476 sigill:
 477         do_exit(SIGILL);
 478 sigsegv:
 479         force_sigsegv(signo, current);
 480 }
 481
 482 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
 483                                  siginfo_t *info,
 484                                  sigset_t *oldset, struct pt_regs *regs)
 485 {
 486         setup_rt_frame(ka, regs, signr, oldset,
 487                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
 488         spin_lock_irq(&current->sighand->siglock);
 489         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 490         if (!(ka->sa.sa_flags & SA_NOMASK))
 491                 sigaddset(&current->blocked,signr);
 492         recalc_sigpending();
 493         spin_unlock_irq(&current->sighand->siglock);
 494 }
 495
 496 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 497                                      struct sigaction *sa)
 498 {
 499         switch (regs->u_regs[UREG_I0]) {
 500         case ERESTART_RESTARTBLOCK:
 501         case ERESTARTNOHAND:
 502         no_system_call_restart:
 503                 regs->u_regs[UREG_I0] = EINTR;
 504                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 505                 break;
 506         case ERESTARTSYS:
 507                 if (!(sa->sa_flags & SA_RESTART))
 508                         goto no_system_call_restart;
 509                 /* fallthrough */
 510         case ERESTARTNOINTR:
 511                 regs->u_regs[UREG_I0] = orig_i0;
 512                 regs->tpc -= 4;
 513                 regs->tnpc -= 4;
 514         }
 515 }
 516
 517 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 518  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 519  * mistake.
 520  */
 521 static void do_signal(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall)
 522 {
 523         siginfo_t info;
 524         struct signal_deliver_cookie cookie;
 525         struct k_sigaction ka;
 526         int signr;
 527         sigset_t *oldset;
 528
 529         cookie.restart_syscall = restart_syscall;
 530         cookie.orig_i0 = orig_i0;
 531
 532         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 533                 oldset = &current->saved_sigmask;
 534         else
 535                 oldset = &current->blocked;
 536
 537 #ifdef CONFIG_SPARC32_COMPAT
 538         if (test_thread_flag(TIF_32BIT)) {
 539                 extern void do_signal32(sigset_t *, struct pt_regs *,
 540                                         unsigned long, int);
 541                 do_signal32(oldset, regs, orig_i0,
 542                             cookie.restart_syscall);
 543                 return;
 544         }
 545 #endif
 546
 547         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
 548         if (signr > 0) {
 549                 if (cookie.restart_syscall)
 550                         syscall_restart(orig_i0, regs, &ka.sa);
 551                 handle_signal(signr, &ka, &info, oldset, regs);
 552
 553                 /* a signal was successfully delivered; the saved
 554                  * sigmask will have been stored in the signal frame,
 555                  * and will be restored by sigreturn, so we can simply
 556                  * clear the TIF_RESTORE_SIGMASK flag.
 557                  */
 558                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
 559                         clear_thread_flag(TIF_RESTORE_SIGMASK);
 560                 return;
 561         }
 562         if (cookie.restart_syscall &&
 563             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 564              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 565              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 566                 /* replay the system call when we are done */
 567                 regs->u_regs[UREG_I0] = cookie.orig_i0;
 568                 regs->tpc -= 4;
 569                 regs->tnpc -= 4;
 570         }
 571         if (cookie.restart_syscall &&
 572             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 573                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 574                 regs->tpc -= 4;
 575                 regs->tnpc -= 4;
 576         }
 577
 578         /* if there's no signal to deliver, we just put the saved sigmask
 579          * back
 580          */
 581         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 582                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 583                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 584         }
 585 }
 586
 587 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, int restart_syscall,
 588                       unsigned long thread_info_flags)
 589 {
 590         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
 591                 do_signal(regs, orig_i0, restart_syscall);
 592 }
 593
 594 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
 595 {
 596         struct signal_deliver_cookie *cp = cookie;
 597
 598         if (cp->restart_syscall &&
 599             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 600              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 601              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 602                 /* replay the system call when we are done */
 603                 regs->u_regs[UREG_I0] = cp->orig_i0;
 604                 regs->tpc -= 4;
 605                 regs->tnpc -= 4;
 606                 cp->restart_syscall = 0;
 607         }
 608         if (cp->restart_syscall &&
 609             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 610                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 611                 regs->tpc -= 4;
 612                 regs->tnpc -= 4;
 613                 cp->restart_syscall = 0;
 614         }
 615 }