err.no Git - linux-2.6/blob - arch/sparc64/kernel/signal.c

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