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   1 /*  $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $
   2  *  linux/arch/sparc/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  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/signal.h>
  13 #include <linux/errno.h>
  14 #include <linux/wait.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/unistd.h>
  17 #include <linux/mm.h>
  18 #include <linux/tty.h>
  19 #include <linux/smp.h>
  20 #include <linux/binfmts.h>      /* do_coredum */
  21 #include <linux/bitops.h>
  22
  23 #include <asm/uaccess.h>
  24 #include <asm/ptrace.h>
  25 #include <asm/pgalloc.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/cacheflush.h>     /* flush_sig_insns */
  28
  29 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  30
  31 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
  32                    void *fpqueue, unsigned long *fpqdepth);
  33 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
  34
  35 /* Signal frames: the original one (compatible with SunOS):
  36  *
  37  * Set up a signal frame... Make the stack look the way SunOS
  38  * expects it to look which is basically:
  39  *
  40  * ---------------------------------- <-- %sp at signal time
  41  * Struct sigcontext
  42  * Signal address
  43  * Ptr to sigcontext area above
  44  * Signal code
  45  * The signal number itself
  46  * One register window
  47  * ---------------------------------- <-- New %sp
  48  */
  49 struct signal_sframe {
  50         struct reg_window       sig_window;
  51         int                     sig_num;
  52         int                     sig_code;
  53         struct sigcontext __user *sig_scptr;
  54         int                     sig_address;
  55         struct sigcontext       sig_context;
  56         unsigned int            extramask[_NSIG_WORDS - 1];
  57 };
  58
  59 /*
  60  * And the new one, intended to be used for Linux applications only
  61  * (we have enough in there to work with clone).
  62  * All the interesting bits are in the info field.
  63  */
  64
  65 struct new_signal_frame {
  66         struct sparc_stackf     ss;
  67         __siginfo_t             info;
  68         __siginfo_fpu_t __user  *fpu_save;
  69         unsigned long           insns[2] __attribute__ ((aligned (8)));
  70         unsigned int            extramask[_NSIG_WORDS - 1];
  71         unsigned int            extra_size; /* Should be 0 */
  72         __siginfo_fpu_t         fpu_state;
  73 };
  74
  75 struct rt_signal_frame {
  76         struct sparc_stackf     ss;
  77         siginfo_t               info;
  78         struct pt_regs          regs;
  79         sigset_t                mask;
  80         __siginfo_fpu_t __user  *fpu_save;
  81         unsigned int            insns[2];
  82         stack_t                 stack;
  83         unsigned int            extra_size; /* Should be 0 */
  84         __siginfo_fpu_t         fpu_state;
  85 };
  86
  87 /* Align macros */
  88 #define SF_ALIGNEDSZ  (((sizeof(struct signal_sframe) + 7) & (~7)))
  89 #define NF_ALIGNEDSZ  (((sizeof(struct new_signal_frame) + 7) & (~7)))
  90 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
  91
  92 static int _sigpause_common(old_sigset_t set)
  93 {
  94         set &= _BLOCKABLE;
  95         spin_lock_irq(&current->sighand->siglock);
  96         current->saved_sigmask = current->blocked;
  97         siginitset(&current->blocked, set);
  98         recalc_sigpending();
  99         spin_unlock_irq(&current->sighand->siglock);
 100
 101         current->state = TASK_INTERRUPTIBLE;
 102         schedule();
 103         set_thread_flag(TIF_RESTORE_SIGMASK);
 104
 105         return -ERESTARTNOHAND;
 106 }
 107
 108 asmlinkage int sys_sigpause(unsigned int set)
 109 {
 110         return _sigpause_common(set);
 111 }
 112
 113 asmlinkage int sys_sigsuspend(old_sigset_t set)
 114 {
 115         return _sigpause_common(set);
 116 }
 117
 118 static inline int
 119 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 120 {
 121         int err;
 122 #ifdef CONFIG_SMP
 123         if (test_tsk_thread_flag(current, TIF_USEDFPU))
 124                 regs->psr &= ~PSR_EF;
 125 #else
 126         if (current == last_task_used_math) {
 127                 last_task_used_math = NULL;
 128                 regs->psr &= ~PSR_EF;
 129         }
 130 #endif
 131         set_used_math();
 132         clear_tsk_thread_flag(current, TIF_USEDFPU);
 133
 134         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
 135                 return -EFAULT;
 136
 137         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
 138                                (sizeof(unsigned long) * 32));
 139         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
 140         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 141         if (current->thread.fpqdepth != 0)
 142                 err |= __copy_from_user(&current->thread.fpqueue[0],
 143                                         &fpu->si_fpqueue[0],
 144                                         ((sizeof(unsigned long) +
 145                                         (sizeof(unsigned long *)))*16));
 146         return err;
 147 }
 148
 149 static inline void do_new_sigreturn (struct pt_regs *regs)
 150 {
 151         struct new_signal_frame __user *sf;
 152         unsigned long up_psr, pc, npc;
 153         sigset_t set;
 154         __siginfo_fpu_t __user *fpu_save;
 155         int err;
 156
 157         sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
 158
 159         /* 1. Make sure we are not getting garbage from the user */
 160         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
 161                 goto segv_and_exit;
 162
 163         if (((unsigned long) sf) & 3)
 164                 goto segv_and_exit;
 165
 166         err = __get_user(pc,  &sf->info.si_regs.pc);
 167         err |= __get_user(npc, &sf->info.si_regs.npc);
 168
 169         if ((pc | npc) & 3)
 170                 goto segv_and_exit;
 171
 172         /* 2. Restore the state */
 173         up_psr = regs->psr;
 174         err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
 175
 176         /* User can only change condition codes and FPU enabling in %psr. */
 177         regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
 178                   | (regs->psr & (PSR_ICC | PSR_EF));
 179
 180         err |= __get_user(fpu_save, &sf->fpu_save);
 181
 182         if (fpu_save)
 183                 err |= restore_fpu_state(regs, fpu_save);
 184
 185         /* This is pretty much atomic, no amount locking would prevent
 186          * the races which exist anyways.
 187          */
 188         err |= __get_user(set.sig[0], &sf->info.si_mask);
 189         err |= __copy_from_user(&set.sig[1], &sf->extramask,
 190                                 (_NSIG_WORDS-1) * sizeof(unsigned int));
 191
 192         if (err)
 193                 goto segv_and_exit;
 194
 195         sigdelsetmask(&set, ~_BLOCKABLE);
 196         spin_lock_irq(&current->sighand->siglock);
 197         current->blocked = set;
 198         recalc_sigpending();
 199         spin_unlock_irq(&current->sighand->siglock);
 200         return;
 201
 202 segv_and_exit:
 203         force_sig(SIGSEGV, current);
 204 }
 205
 206 asmlinkage void do_sigreturn(struct pt_regs *regs)
 207 {
 208         struct sigcontext __user *scptr;
 209         unsigned long pc, npc, psr;
 210         sigset_t set;
 211         int err;
 212
 213         /* Always make any pending restarted system calls return -EINTR */
 214         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 215
 216         synchronize_user_stack();
 217
 218         if (current->thread.new_signal) {
 219                 do_new_sigreturn(regs);
 220                 return;
 221         }
 222
 223         scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
 224
 225         /* Check sanity of the user arg. */
 226         if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
 227             (((unsigned long) scptr) & 3))
 228                 goto segv_and_exit;
 229
 230         err = __get_user(pc, &scptr->sigc_pc);
 231         err |= __get_user(npc, &scptr->sigc_npc);
 232
 233         if ((pc | npc) & 3)
 234                 goto segv_and_exit;
 235
 236         /* This is pretty much atomic, no amount locking would prevent
 237          * the races which exist anyways.
 238          */
 239         err |= __get_user(set.sig[0], &scptr->sigc_mask);
 240         /* Note that scptr + 1 points to extramask */
 241         err |= __copy_from_user(&set.sig[1], scptr + 1,
 242                                 (_NSIG_WORDS - 1) * sizeof(unsigned int));
 243
 244         if (err)
 245                 goto segv_and_exit;
 246
 247         sigdelsetmask(&set, ~_BLOCKABLE);
 248         spin_lock_irq(&current->sighand->siglock);
 249         current->blocked = set;
 250         recalc_sigpending();
 251         spin_unlock_irq(&current->sighand->siglock);
 252
 253         regs->pc = pc;
 254         regs->npc = npc;
 255
 256         err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
 257         err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
 258         err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
 259
 260         /* User can only change condition codes in %psr. */
 261         err |= __get_user(psr, &scptr->sigc_psr);
 262         if (err)
 263                 goto segv_and_exit;
 264
 265         regs->psr &= ~(PSR_ICC);
 266         regs->psr |= (psr & PSR_ICC);
 267         return;
 268
 269 segv_and_exit:
 270         force_sig(SIGSEGV, current);
 271 }
 272
 273 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 274 {
 275         struct rt_signal_frame __user *sf;
 276         unsigned int psr, pc, npc;
 277         __siginfo_fpu_t __user *fpu_save;
 278         mm_segment_t old_fs;
 279         sigset_t set;
 280         stack_t st;
 281         int err;
 282
 283         synchronize_user_stack();
 284         sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
 285         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
 286             (((unsigned long) sf) & 0x03))
 287                 goto segv;
 288
 289         err = __get_user(pc, &sf->regs.pc);
 290         err |= __get_user(npc, &sf->regs.npc);
 291         err |= ((pc | npc) & 0x03);
 292
 293         err |= __get_user(regs->y, &sf->regs.y);
 294         err |= __get_user(psr, &sf->regs.psr);
 295
 296         err |= __copy_from_user(&regs->u_regs[UREG_G1],
 297                                 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
 298
 299         regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
 300
 301         err |= __get_user(fpu_save, &sf->fpu_save);
 302
 303         if (fpu_save)
 304                 err |= restore_fpu_state(regs, fpu_save);
 305         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 306
 307         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 308
 309         if (err)
 310                 goto segv;
 311
 312         regs->pc = pc;
 313         regs->npc = npc;
 314
 315         /* It is more difficult to avoid calling this function than to
 316          * call it and ignore errors.
 317          */
 318         old_fs = get_fs();
 319         set_fs(KERNEL_DS);
 320         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
 321         set_fs(old_fs);
 322
 323         sigdelsetmask(&set, ~_BLOCKABLE);
 324         spin_lock_irq(&current->sighand->siglock);
 325         current->blocked = set;
 326         recalc_sigpending();
 327         spin_unlock_irq(&current->sighand->siglock);
 328         return;
 329 segv:
 330         force_sig(SIGSEGV, current);
 331 }
 332
 333 /* Checks if the fp is valid */
 334 static inline int invalid_frame_pointer(void __user *fp, int fplen)
 335 {
 336         if ((((unsigned long) fp) & 7) ||
 337             !__access_ok((unsigned long)fp, fplen) ||
 338             ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
 339              ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
 340                 return 1;
 341
 342         return 0;
 343 }
 344
 345 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
 346 {
 347         unsigned long sp;
 348
 349         sp = regs->u_regs[UREG_FP];
 350
 351         /* This is the X/Open sanctioned signal stack switching.  */
 352         if (sa->sa_flags & SA_ONSTACK) {
 353                 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
 354                         sp = current->sas_ss_sp + current->sas_ss_size;
 355         }
 356         return (void __user *)(sp - framesize);
 357 }
 358
 359 static inline void
 360 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
 361 {
 362         struct signal_sframe __user *sframep;
 363         struct sigcontext __user *sc;
 364         int window = 0, err;
 365         unsigned long pc = regs->pc;
 366         unsigned long npc = regs->npc;
 367         struct thread_info *tp = current_thread_info();
 368         void __user *sig_address;
 369         int sig_code;
 370
 371         synchronize_user_stack();
 372         sframep = (struct signal_sframe __user *)
 373                 get_sigframe(sa, regs, SF_ALIGNEDSZ);
 374         if (invalid_frame_pointer(sframep, sizeof(*sframep))){
 375                 /* Don't change signal code and address, so that
 376                  * post mortem debuggers can have a look.
 377                  */
 378                 goto sigill_and_return;
 379         }
 380
 381         sc = &sframep->sig_context;
 382
 383         /* We've already made sure frame pointer isn't in kernel space... */
 384         err  = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
 385                          &sc->sigc_onstack);
 386         err |= __put_user(oldset->sig[0], &sc->sigc_mask);
 387         err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
 388                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 389         err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
 390         err |= __put_user(pc, &sc->sigc_pc);
 391         err |= __put_user(npc, &sc->sigc_npc);
 392         err |= __put_user(regs->psr, &sc->sigc_psr);
 393         err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
 394         err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
 395         err |= __put_user(tp->w_saved, &sc->sigc_oswins);
 396         if (tp->w_saved)
 397                 for (window = 0; window < tp->w_saved; window++) {
 398                         put_user((char *)tp->rwbuf_stkptrs[window],
 399                                  &sc->sigc_spbuf[window]);
 400                         err |= __copy_to_user(&sc->sigc_wbuf[window],
 401                                               &tp->reg_window[window],
 402                                               sizeof(struct reg_window));
 403                 }
 404         else
 405                 err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
 406                                       sizeof(struct reg_window));
 407
 408         tp->w_saved = 0; /* So process is allowed to execute. */
 409
 410         err |= __put_user(signr, &sframep->sig_num);
 411         sig_address = NULL;
 412         sig_code = 0;
 413         if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
 414                 sig_address = info->si_addr;
 415                 switch (signr) {
 416                 case SIGSEGV:
 417                         switch (info->si_code) {
 418                         case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
 419                         default: sig_code = SUBSIG_PROTECTION; break;
 420                         }
 421                         break;
 422                 case SIGILL:
 423                         switch (info->si_code) {
 424                         case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
 425                         case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
 426                         case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
 427                         default: sig_code = SUBSIG_STACK; break;
 428                         }
 429                         break;
 430                 case SIGFPE:
 431                         switch (info->si_code) {
 432                         case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
 433                         case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
 434                         case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
 435                         case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
 436                         case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
 437                         case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
 438                         case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
 439                         default: sig_code = SUBSIG_FPERROR; break;
 440                         }
 441                         break;
 442                 case SIGBUS:
 443                         switch (info->si_code) {
 444                         case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
 445                         case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
 446                         default: sig_code = SUBSIG_BUSTIMEOUT; break;
 447                         }
 448                         break;
 449                 case SIGEMT:
 450                         switch (info->si_code) {
 451                         case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
 452                         }
 453                         break;
 454                 case SIGSYS:
 455                         if (info->si_code == (__SI_FAULT|0x100)) {
 456                                 sig_code = info->si_trapno;
 457                                 break;
 458                         }
 459                 default:
 460                         sig_address = NULL;
 461                 }
 462         }
 463         err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
 464         err |= __put_user(sig_code, &sframep->sig_code);
 465         err |= __put_user(sc, &sframep->sig_scptr);
 466         if (err)
 467                 goto sigsegv;
 468
 469         regs->u_regs[UREG_FP] = (unsigned long) sframep;
 470         regs->pc = (unsigned long) sa->sa_handler;
 471         regs->npc = (regs->pc + 4);
 472         return;
 473
 474 sigill_and_return:
 475         do_exit(SIGILL);
 476 sigsegv:
 477         force_sigsegv(signr, current);
 478 }
 479
 480
 481 static inline int
 482 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 483 {
 484         int err = 0;
 485 #ifdef CONFIG_SMP
 486         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
 487                 put_psr(get_psr() | PSR_EF);
 488                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 489                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 490                 regs->psr &= ~(PSR_EF);
 491                 clear_tsk_thread_flag(current, TIF_USEDFPU);
 492         }
 493 #else
 494         if (current == last_task_used_math) {
 495                 put_psr(get_psr() | PSR_EF);
 496                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 497                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 498                 last_task_used_math = NULL;
 499                 regs->psr &= ~(PSR_EF);
 500         }
 501 #endif
 502         err |= __copy_to_user(&fpu->si_float_regs[0],
 503                               &current->thread.float_regs[0],
 504                               (sizeof(unsigned long) * 32));
 505         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
 506         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 507         if (current->thread.fpqdepth != 0)
 508                 err |= __copy_to_user(&fpu->si_fpqueue[0],
 509                                       &current->thread.fpqueue[0],
 510                                       ((sizeof(unsigned long) +
 511                                       (sizeof(unsigned long *)))*16));
 512         clear_used_math();
 513         return err;
 514 }
 515
 516 static inline void
 517 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 518                 int signo, sigset_t *oldset)
 519 {
 520         struct new_signal_frame __user *sf;
 521         int sigframe_size, err;
 522
 523         /* 1. Make sure everything is clean */
 524         synchronize_user_stack();
 525
 526         sigframe_size = NF_ALIGNEDSZ;
 527         if (!used_math())
 528                 sigframe_size -= sizeof(__siginfo_fpu_t);
 529
 530         sf = (struct new_signal_frame __user *)
 531                 get_sigframe(&ka->sa, regs, sigframe_size);
 532
 533         if (invalid_frame_pointer(sf, sigframe_size))
 534                 goto sigill_and_return;
 535
 536         if (current_thread_info()->w_saved != 0)
 537                 goto sigill_and_return;
 538
 539         /* 2. Save the current process state */
 540         err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
 541
 542         err |= __put_user(0, &sf->extra_size);
 543
 544         if (used_math()) {
 545                 err |= save_fpu_state(regs, &sf->fpu_state);
 546                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 547         } else {
 548                 err |= __put_user(0, &sf->fpu_save);
 549         }
 550
 551         err |= __put_user(oldset->sig[0], &sf->info.si_mask);
 552         err |= __copy_to_user(sf->extramask, &oldset->sig[1],
 553                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 554         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 555                               sizeof(struct reg_window));
 556         if (err)
 557                 goto sigsegv;
 558
 559         /* 3. signal handler back-trampoline and parameters */
 560         regs->u_regs[UREG_FP] = (unsigned long) sf;
 561         regs->u_regs[UREG_I0] = signo;
 562         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 563         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 564
 565         /* 4. signal handler */
 566         regs->pc = (unsigned long) ka->sa.sa_handler;
 567         regs->npc = (regs->pc + 4);
 568
 569         /* 5. return to kernel instructions */
 570         if (ka->ka_restorer)
 571                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 572         else {
 573                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 574
 575                 /* mov __NR_sigreturn, %g1 */
 576                 err |= __put_user(0x821020d8, &sf->insns[0]);
 577
 578                 /* t 0x10 */
 579                 err |= __put_user(0x91d02010, &sf->insns[1]);
 580                 if (err)
 581                         goto sigsegv;
 582
 583                 /* Flush instruction space. */
 584                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 585         }
 586         return;
 587
 588 sigill_and_return:
 589         do_exit(SIGILL);
 590 sigsegv:
 591         force_sigsegv(signo, current);
 592 }
 593
 594 static inline void
 595 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 596                    int signo, sigset_t *oldset, siginfo_t *info)
 597 {
 598         struct rt_signal_frame __user *sf;
 599         int sigframe_size;
 600         unsigned int psr;
 601         int err;
 602
 603         synchronize_user_stack();
 604         sigframe_size = RT_ALIGNEDSZ;
 605         if (!used_math())
 606                 sigframe_size -= sizeof(__siginfo_fpu_t);
 607         sf = (struct rt_signal_frame __user *)
 608                 get_sigframe(&ka->sa, regs, sigframe_size);
 609         if (invalid_frame_pointer(sf, sigframe_size))
 610                 goto sigill;
 611         if (current_thread_info()->w_saved != 0)
 612                 goto sigill;
 613
 614         err  = __put_user(regs->pc, &sf->regs.pc);
 615         err |= __put_user(regs->npc, &sf->regs.npc);
 616         err |= __put_user(regs->y, &sf->regs.y);
 617         psr = regs->psr;
 618         if (used_math())
 619                 psr |= PSR_EF;
 620         err |= __put_user(psr, &sf->regs.psr);
 621         err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
 622         err |= __put_user(0, &sf->extra_size);
 623
 624         if (psr & PSR_EF) {
 625                 err |= save_fpu_state(regs, &sf->fpu_state);
 626                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 627         } else {
 628                 err |= __put_user(0, &sf->fpu_save);
 629         }
 630         err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
 631
 632         /* Setup sigaltstack */
 633         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 634         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 635         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 636
 637         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 638                               sizeof(struct reg_window));
 639
 640         err |= copy_siginfo_to_user(&sf->info, info);
 641
 642         if (err)
 643                 goto sigsegv;
 644
 645         regs->u_regs[UREG_FP] = (unsigned long) sf;
 646         regs->u_regs[UREG_I0] = signo;
 647         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 648         regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
 649
 650         regs->pc = (unsigned long) ka->sa.sa_handler;
 651         regs->npc = (regs->pc + 4);
 652
 653         if (ka->ka_restorer)
 654                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 655         else {
 656                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 657
 658                 /* mov __NR_sigreturn, %g1 */
 659                 err |= __put_user(0x821020d8, &sf->insns[0]);
 660
 661                 /* t 0x10 */
 662                 err |= __put_user(0x91d02010, &sf->insns[1]);
 663                 if (err)
 664                         goto sigsegv;
 665
 666                 /* Flush instruction space. */
 667                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 668         }
 669         return;
 670
 671 sigill:
 672         do_exit(SIGILL);
 673 sigsegv:
 674         force_sigsegv(signo, current);
 675 }
 676
 677 static inline void
 678 handle_signal(unsigned long signr, struct k_sigaction *ka,
 679               siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
 680 {
 681         if (ka->sa.sa_flags & SA_SIGINFO)
 682                 new_setup_rt_frame(ka, regs, signr, oldset, info);
 683         else if (current->thread.new_signal)
 684                 new_setup_frame(ka, regs, signr, oldset);
 685         else
 686                 setup_frame(&ka->sa, regs, signr, oldset, info);
 687
 688         spin_lock_irq(&current->sighand->siglock);
 689         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 690         if (!(ka->sa.sa_flags & SA_NOMASK))
 691                 sigaddset(&current->blocked, signr);
 692         recalc_sigpending();
 693         spin_unlock_irq(&current->sighand->siglock);
 694 }
 695
 696 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 697                                    struct sigaction *sa)
 698 {
 699         switch(regs->u_regs[UREG_I0]) {
 700         case ERESTART_RESTARTBLOCK:
 701         case ERESTARTNOHAND:
 702         no_system_call_restart:
 703                 regs->u_regs[UREG_I0] = EINTR;
 704                 regs->psr |= PSR_C;
 705                 break;
 706         case ERESTARTSYS:
 707                 if (!(sa->sa_flags & SA_RESTART))
 708                         goto no_system_call_restart;
 709                 /* fallthrough */
 710         case ERESTARTNOINTR:
 711                 regs->u_regs[UREG_I0] = orig_i0;
 712                 regs->pc -= 4;
 713                 regs->npc -= 4;
 714         }
 715 }
 716
 717 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 718  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 719  * mistake.
 720  */
 721 asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
 722 {
 723         siginfo_t info;
 724         struct sparc_deliver_cookie cookie;
 725         struct k_sigaction ka;
 726         int signr;
 727         sigset_t *oldset;
 728
 729         cookie.restart_syscall = restart_syscall;
 730         cookie.orig_i0 = orig_i0;
 731
 732         if (test_thread_flag(TIF_RESTORE_SIGMASK))
 733                 oldset = &current->saved_sigmask;
 734         else
 735                 oldset = &current->blocked;
 736
 737         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
 738         if (signr > 0) {
 739                 if (cookie.restart_syscall)
 740                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
 741                 handle_signal(signr, &ka, &info, oldset, regs);
 742
 743                 /* a signal was successfully delivered; the saved
 744                  * sigmask will have been stored in the signal frame,
 745                  * and will be restored by sigreturn, so we can simply
 746                  * clear the TIF_RESTORE_SIGMASK flag.
 747                  */
 748                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
 749                         clear_thread_flag(TIF_RESTORE_SIGMASK);
 750                 return;
 751         }
 752         if (cookie.restart_syscall &&
 753             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 754              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 755              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 756                 /* replay the system call when we are done */
 757                 regs->u_regs[UREG_I0] = cookie.orig_i0;
 758                 regs->pc -= 4;
 759                 regs->npc -= 4;
 760         }
 761         if (cookie.restart_syscall &&
 762             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 763                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 764                 regs->pc -= 4;
 765                 regs->npc -= 4;
 766         }
 767
 768         /* if there's no signal to deliver, we just put the saved sigmask
 769          * back
 770          */
 771         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
 772                 clear_thread_flag(TIF_RESTORE_SIGMASK);
 773                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
 774         }
 775 }
 776
 777 asmlinkage int
 778 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
 779                 unsigned long sp)
 780 {
 781         int ret = -EFAULT;
 782
 783         /* First see if old state is wanted. */
 784         if (ossptr) {
 785                 if (put_user(current->sas_ss_sp + current->sas_ss_size,
 786                              &ossptr->the_stack) ||
 787                     __put_user(on_sig_stack(sp), &ossptr->cur_status))
 788                         goto out;
 789         }
 790
 791         /* Now see if we want to update the new state. */
 792         if (ssptr) {
 793                 char *ss_sp;
 794
 795                 if (get_user(ss_sp, &ssptr->the_stack))
 796                         goto out;
 797                 /* If the current stack was set with sigaltstack, don't
 798                    swap stacks while we are on it.  */
 799                 ret = -EPERM;
 800                 if (current->sas_ss_sp && on_sig_stack(sp))
 801                         goto out;
 802
 803                 /* Since we don't know the extent of the stack, and we don't
 804                    track onstack-ness, but rather calculate it, we must
 805                    presume a size.  Ho hum this interface is lossy.  */
 806                 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
 807                 current->sas_ss_size = SIGSTKSZ;
 808         }
 809         ret = 0;
 810 out:
 811         return ret;
 812 }
 813
 814 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
 815 {
 816         struct sparc_deliver_cookie *cp = cookie;
 817
 818         if (cp->restart_syscall &&
 819             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 820              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 821              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 822                 /* replay the system call when we are done */
 823                 regs->u_regs[UREG_I0] = cp->orig_i0;
 824                 regs->pc -= 4;
 825                 regs->npc -= 4;
 826                 cp->restart_syscall = 0;
 827         }
 828
 829         if (cp->restart_syscall &&
 830             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 831                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 832                 regs->pc -= 4;
 833                 regs->npc -= 4;
 834                 cp->restart_syscall = 0;
 835         }
 836 }