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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/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 /* Align macros */
 240 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 241
 242 static long _sigpause_common(old_sigset_t set)
 243 {
 244         set &= _BLOCKABLE;
 245         spin_lock_irq(&current->sighand->siglock);
 246         current->saved_sigmask = current->blocked;
 247         siginitset(&current->blocked, set);
 248         recalc_sigpending();
 249         spin_unlock_irq(&current->sighand->siglock);
 250
 251         current->state = TASK_INTERRUPTIBLE;
 252         schedule();
 253         set_thread_flag(TIF_RESTORE_SIGMASK);
 254         return -ERESTARTNOHAND;
 255 }
 256
 257 asmlinkage long sys_sigpause(unsigned int set)
 258 {
 259         return _sigpause_common(set);
 260 }
 261
 262 asmlinkage long sys_sigsuspend(old_sigset_t set)
 263 {
 264         return _sigpause_common(set);
 265 }
 266
 267 static inline int
 268 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 269 {
 270         unsigned long *fpregs = current_thread_info()->fpregs;
 271         unsigned long fprs;
 272         int err;
 273
 274         err = __get_user(fprs, &fpu->si_fprs);
 275         fprs_write(0);
 276         regs->tstate &= ~TSTATE_PEF;
 277         if (fprs & FPRS_DL)
 278                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
 279                                (sizeof(unsigned int) * 32));
 280         if (fprs & FPRS_DU)
 281                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
 282                                (sizeof(unsigned int) * 32));
 283         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 284         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 285         current_thread_info()->fpsaved[0] |= fprs;
 286         return err;
 287 }
 288
 289 void do_rt_sigreturn(struct pt_regs *regs)
 290 {
 291         struct rt_signal_frame __user *sf;
 292         unsigned long tpc, tnpc, tstate;
 293         __siginfo_fpu_t __user *fpu_save;
 294         sigset_t set;
 295         int err;
 296
 297         /* Always make any pending restarted system calls return -EINTR */
 298         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 299
 300         synchronize_user_stack ();
 301         sf = (struct rt_signal_frame __user *)
 302                 (regs->u_regs [UREG_FP] + STACK_BIAS);
 303
 304         /* 1. Make sure we are not getting garbage from the user */
 305         if (((unsigned long) sf) & 3)
 306                 goto segv;
 307
 308         err = get_user(tpc, &sf->regs.tpc);
 309         err |= __get_user(tnpc, &sf->regs.tnpc);
 310         if (test_thread_flag(TIF_32BIT)) {
 311                 tpc &= 0xffffffff;
 312                 tnpc &= 0xffffffff;
 313         }
 314         err |= ((tpc | tnpc) & 3);
 315
 316         /* 2. Restore the state */
 317         err |= __get_user(regs->y, &sf->regs.y);
 318         err |= __get_user(tstate, &sf->regs.tstate);
 319         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
 320
 321         /* User can only change condition codes and %asi in %tstate. */
 322         regs->tstate &= ~(TSTATE_ASI | TSTATE_ICC | TSTATE_XCC);
 323         regs->tstate |= (tstate & (TSTATE_ASI | TSTATE_ICC | TSTATE_XCC));
 324
 325         err |= __get_user(fpu_save, &sf->fpu_save);
 326         if (fpu_save)
 327                 err |= restore_fpu_state(regs, &sf->fpu_state);
 328
 329         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 330         err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
 331
 332         if (err)
 333                 goto segv;
 334
 335         regs->tpc = tpc;
 336         regs->tnpc = tnpc;
 337
 338         sigdelsetmask(&set, ~_BLOCKABLE);
 339         spin_lock_irq(&current->sighand->siglock);
 340         current->blocked = set;
 341         recalc_sigpending();
 342         spin_unlock_irq(&current->sighand->siglock);
 343         return;
 344 segv:
 345         force_sig(SIGSEGV, current);
 346 }
 347
 348 /* Checks if the fp is valid */
 349 static int invalid_frame_pointer(void __user *fp, int fplen)
 350 {
 351         if (((unsigned long) fp) & 7)
 352                 return 1;
 353         return 0;
 354 }
 355
 356 static inline int
 357 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 358 {
 359         unsigned long *fpregs = current_thread_info()->fpregs;
 360         unsigned long fprs;
 361         int err = 0;
 362
 363         fprs = current_thread_info()->fpsaved[0];
 364         if (fprs & FPRS_DL)
 365                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
 366                                     (sizeof(unsigned int) * 32));
 367         if (fprs & FPRS_DU)
 368                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
 369                                     (sizeof(unsigned int) * 32));
 370         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 371         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 372         err |= __put_user(fprs, &fpu->si_fprs);
 373
 374         return err;
 375 }
 376
 377 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
 378 {
 379         unsigned long sp;
 380
 381         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
 382
 383         /* This is the X/Open sanctioned signal stack switching.  */
 384         if (ka->sa.sa_flags & SA_ONSTACK) {
 385                 if (!on_sig_stack(sp) &&
 386                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
 387                         sp = current->sas_ss_sp + current->sas_ss_size;
 388         }
 389         return (void __user *)(sp - framesize);
 390 }
 391
 392 static inline void
 393 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 394                int signo, sigset_t *oldset, siginfo_t *info)
 395 {
 396         struct rt_signal_frame __user *sf;
 397         int sigframe_size, err;
 398
 399         /* 1. Make sure everything is clean */
 400         synchronize_user_stack();
 401         save_and_clear_fpu();
 402
 403         sigframe_size = RT_ALIGNEDSZ;
 404         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
 405                 sigframe_size -= sizeof(__siginfo_fpu_t);
 406
 407         sf = (struct rt_signal_frame __user *)
 408                 get_sigframe(ka, regs, sigframe_size);
 409
 410         if (invalid_frame_pointer (sf, sigframe_size))
 411                 goto sigill;
 412
 413         if (get_thread_wsaved() != 0)
 414                 goto sigill;
 415
 416         /* 2. Save the current process state */
 417         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
 418
 419         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
 420                 err |= save_fpu_state(regs, &sf->fpu_state);
 421                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
 422         } else {
 423                 err |= __put_user(0, &sf->fpu_save);
 424         }
 425
 426         /* Setup sigaltstack */
 427         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 428         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 429         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 430
 431         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
 432
 433         err |= copy_in_user((u64 __user *)sf,
 434                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
 435                             sizeof(struct reg_window));
 436
 437         if (info)
 438                 err |= copy_siginfo_to_user(&sf->info, info);
 439         else {
 440                 err |= __put_user(signo, &sf->info.si_signo);
 441                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
 442         }
 443         if (err)
 444                 goto sigsegv;
 445
 446         /* 3. signal handler back-trampoline and parameters */
 447         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
 448         regs->u_regs[UREG_I0] = signo;
 449         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 450
 451         /* The sigcontext is passed in this way because of how it
 452          * is defined in GLIBC's /usr/include/bits/sigcontext.h
 453          * for sparc64.  It includes the 128 bytes of siginfo_t.
 454          */
 455         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 456
 457         /* 5. signal handler */
 458         regs->tpc = (unsigned long) ka->sa.sa_handler;
 459         regs->tnpc = (regs->tpc + 4);
 460         if (test_thread_flag(TIF_32BIT)) {
 461                 regs->tpc &= 0xffffffff;
 462                 regs->tnpc &= 0xffffffff;
 463         }
 464         /* 4. return to kernel instructions */
 465         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 466         return;
 467
 468 sigill:
 469         do_exit(SIGILL);
 470 sigsegv:
 471         force_sigsegv(signo, current);
 472 }
 473
 474 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
 475                                  siginfo_t *info,
 476                                  sigset_t *oldset, struct pt_regs *regs)
 477 {
 478         setup_rt_frame(ka, regs, signr, oldset,
 479                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
 480         spin_lock_irq(&current->sighand->siglock);
 481         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 482         if (!(ka->sa.sa_flags & SA_NOMASK))
 483                 sigaddset(&current->blocked,signr);
 484         recalc_sigpending();
 485         spin_unlock_irq(&current->sighand->siglock);
 486 }
 487
 488 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 489                                      struct sigaction *sa)
 490 {
 491         switch (regs->u_regs[UREG_I0]) {
 492         case ERESTART_RESTARTBLOCK:
 493         case ERESTARTNOHAND:
 494         no_system_call_restart:
 495                 regs->u_regs[UREG_I0] = EINTR;
 496                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 497                 break;
 498         case ERESTARTSYS:
 499                 if (!(sa->sa_flags & SA_RESTART))
 500                         goto no_system_call_restart;
 501                 /* fallthrough */
 502         case ERESTARTNOINTR:
 503                 regs->u_regs[UREG_I0] = orig_i0;
 504                 regs->tpc -= 4;
 505                 regs->tnpc -= 4;
 506         }
 507 }
 508
 509 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 510  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 511  * mistake.
 512  */
 513 static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
 514 {
 515         struct signal_deliver_cookie cookie;
 516         struct k_sigaction ka;
 517         sigset_t *oldset;
 518         siginfo_t info;
 519         int signr, tt;
 520
 521         tt = regs->magic & 0x1ff;
 522         if (tt == 0x110 || tt == 0x111 || tt == 0x16d) {
 523                 regs->magic &= ~0x1ff;
 524                 cookie.restart_syscall = 1;
 525         } else
 526                 cookie.restart_syscall = 0;
 527         cookie.orig_i0 = orig_i0;
 528
 529         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 530                 oldset = &current->saved_sigmask;
 531         else
 532                 oldset = &current->blocked;
 533
 534 #ifdef CONFIG_SPARC32_COMPAT
 535         if (test_thread_flag(TIF_32BIT)) {
 536                 extern void do_signal32(sigset_t *, struct pt_regs *,
 537                                         struct signal_deliver_cookie *);
 538                 do_signal32(oldset, regs, &cookie);
 539                 return;
 540         }
 541 #endif
 542
 543         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
 544         if (signr > 0) {
 545                 if (cookie.restart_syscall)
 546                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
 547                 handle_signal(signr, &ka, &info, oldset, regs);
 548
 549                 /* a signal was successfully delivered; the saved
 550                  * sigmask will have been stored in the signal frame,
 551                  * and will be restored by sigreturn, so we can simply
 552                  * clear the TIF_RESTORE_SIGMASK flag.
 553                  */
 554                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
 555                         clear_thread_flag(TIF_RESTORE_SIGMASK);
 556                 return;
 557         }
 558         if (cookie.restart_syscall &&
 559             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 560              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 561              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 562                 /* replay the system call when we are done */
 563                 regs->u_regs[UREG_I0] = cookie.orig_i0;
 564                 regs->tpc -= 4;
 565                 regs->tnpc -= 4;
 566         }
 567         if (cookie.restart_syscall &&
 568             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 569                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 570                 regs->tpc -= 4;
 571                 regs->tnpc -= 4;
 572         }
 573
 574         /* if there's no signal to deliver, we just put the saved sigmask
 575          * back
 576          */
 577         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 578                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 579                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 580         }
 581 }
 582
 583 void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0, unsigned long thread_info_flags)
 584 {
 585         if (thread_info_flags & (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK))
 586                 do_signal(regs, orig_i0);
 587 }
 588
 589 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
 590 {
 591         struct signal_deliver_cookie *cp = cookie;
 592
 593         if (cp->restart_syscall &&
 594             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 595              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 596              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 597                 /* replay the system call when we are done */
 598                 regs->u_regs[UREG_I0] = cp->orig_i0;
 599                 regs->tpc -= 4;
 600                 regs->tnpc -= 4;
 601                 cp->restart_syscall = 0;
 602         }
 603         if (cp->restart_syscall &&
 604             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 605                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 606                 regs->tpc -= 4;
 607                 regs->tnpc -= 4;
 608                 cp->restart_syscall = 0;
 609         }
 610 }