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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/config.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel.h>
  13 #include <linux/signal.h>
  14 #include <linux/errno.h>
  15 #include <linux/wait.h>
  16 #include <linux/ptrace.h>
  17 #include <linux/unistd.h>
  18 #include <linux/mm.h>
  19 #include <linux/tty.h>
  20 #include <linux/smp.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/binfmts.h>      /* do_coredum */
  23 #include <linux/bitops.h>
  24
  25 #include <asm/uaccess.h>
  26 #include <asm/ptrace.h>
  27 #include <asm/svr4.h>
  28 #include <asm/pgalloc.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/cacheflush.h>     /* flush_sig_insns */
  31
  32 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  33
  34 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
  35                    void *fpqueue, unsigned long *fpqdepth);
  36 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
  37
  38 /* Signal frames: the original one (compatible with SunOS):
  39  *
  40  * Set up a signal frame... Make the stack look the way SunOS
  41  * expects it to look which is basically:
  42  *
  43  * ---------------------------------- <-- %sp at signal time
  44  * Struct sigcontext
  45  * Signal address
  46  * Ptr to sigcontext area above
  47  * Signal code
  48  * The signal number itself
  49  * One register window
  50  * ---------------------------------- <-- New %sp
  51  */
  52 struct signal_sframe {
  53         struct reg_window       sig_window;
  54         int                     sig_num;
  55         int                     sig_code;
  56         struct sigcontext __user *sig_scptr;
  57         int                     sig_address;
  58         struct sigcontext       sig_context;
  59         unsigned int            extramask[_NSIG_WORDS - 1];
  60 };
  61
  62 /*
  63  * And the new one, intended to be used for Linux applications only
  64  * (we have enough in there to work with clone).
  65  * All the interesting bits are in the info field.
  66  */
  67
  68 struct new_signal_frame {
  69         struct sparc_stackf     ss;
  70         __siginfo_t             info;
  71         __siginfo_fpu_t __user  *fpu_save;
  72         unsigned long           insns[2] __attribute__ ((aligned (8)));
  73         unsigned int            extramask[_NSIG_WORDS - 1];
  74         unsigned int            extra_size; /* Should be 0 */
  75         __siginfo_fpu_t         fpu_state;
  76 };
  77
  78 struct rt_signal_frame {
  79         struct sparc_stackf     ss;
  80         siginfo_t               info;
  81         struct pt_regs          regs;
  82         sigset_t                mask;
  83         __siginfo_fpu_t __user  *fpu_save;
  84         unsigned int            insns[2];
  85         stack_t                 stack;
  86         unsigned int            extra_size; /* Should be 0 */
  87         __siginfo_fpu_t         fpu_state;
  88 };
  89
  90 /* Align macros */
  91 #define SF_ALIGNEDSZ  (((sizeof(struct signal_sframe) + 7) & (~7)))
  92 #define NF_ALIGNEDSZ  (((sizeof(struct new_signal_frame) + 7) & (~7)))
  93 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
  94
  95 static int _sigpause_common(old_sigset_t set)
  96 {
  97         set &= _BLOCKABLE;
  98         spin_lock_irq(&current->sighand->siglock);
  99         current->saved_sigmask = current->blocked;
 100         siginitset(&current->blocked, set);
 101         recalc_sigpending();
 102         spin_unlock_irq(&current->sighand->siglock);
 103
 104         current->state = TASK_INTERRUPTIBLE;
 105         schedule();
 106         set_thread_flag(TIF_RESTORE_SIGMASK);
 107
 108         return -ERESTARTNOHAND;
 109 }
 110
 111 asmlinkage int sys_sigpause(unsigned int set)
 112 {
 113         return _sigpause_common(set);
 114 }
 115
 116 asmlinkage int sys_sigsuspend(old_sigset_t set)
 117 {
 118         return _sigpause_common(set);
 119 }
 120
 121 static inline int
 122 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 123 {
 124         int err;
 125 #ifdef CONFIG_SMP
 126         if (test_tsk_thread_flag(current, TIF_USEDFPU))
 127                 regs->psr &= ~PSR_EF;
 128 #else
 129         if (current == last_task_used_math) {
 130                 last_task_used_math = NULL;
 131                 regs->psr &= ~PSR_EF;
 132         }
 133 #endif
 134         set_used_math();
 135         clear_tsk_thread_flag(current, TIF_USEDFPU);
 136
 137         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
 138                 return -EFAULT;
 139
 140         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
 141                                (sizeof(unsigned long) * 32));
 142         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
 143         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 144         if (current->thread.fpqdepth != 0)
 145                 err |= __copy_from_user(&current->thread.fpqueue[0],
 146                                         &fpu->si_fpqueue[0],
 147                                         ((sizeof(unsigned long) +
 148                                         (sizeof(unsigned long *)))*16));
 149         return err;
 150 }
 151
 152 static inline void do_new_sigreturn (struct pt_regs *regs)
 153 {
 154         struct new_signal_frame __user *sf;
 155         unsigned long up_psr, pc, npc;
 156         sigset_t set;
 157         __siginfo_fpu_t __user *fpu_save;
 158         int err;
 159
 160         sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
 161
 162         /* 1. Make sure we are not getting garbage from the user */
 163         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
 164                 goto segv_and_exit;
 165
 166         if (((unsigned long) sf) & 3)
 167                 goto segv_and_exit;
 168
 169         err = __get_user(pc,  &sf->info.si_regs.pc);
 170         err |= __get_user(npc, &sf->info.si_regs.npc);
 171
 172         if ((pc | npc) & 3)
 173                 goto segv_and_exit;
 174
 175         /* 2. Restore the state */
 176         up_psr = regs->psr;
 177         err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
 178
 179         /* User can only change condition codes and FPU enabling in %psr. */
 180         regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
 181                   | (regs->psr & (PSR_ICC | PSR_EF));
 182
 183         err |= __get_user(fpu_save, &sf->fpu_save);
 184
 185         if (fpu_save)
 186                 err |= restore_fpu_state(regs, fpu_save);
 187
 188         /* This is pretty much atomic, no amount locking would prevent
 189          * the races which exist anyways.
 190          */
 191         err |= __get_user(set.sig[0], &sf->info.si_mask);
 192         err |= __copy_from_user(&set.sig[1], &sf->extramask,
 193                                 (_NSIG_WORDS-1) * sizeof(unsigned int));
 194
 195         if (err)
 196                 goto segv_and_exit;
 197
 198         sigdelsetmask(&set, ~_BLOCKABLE);
 199         spin_lock_irq(&current->sighand->siglock);
 200         current->blocked = set;
 201         recalc_sigpending();
 202         spin_unlock_irq(&current->sighand->siglock);
 203         return;
 204
 205 segv_and_exit:
 206         force_sig(SIGSEGV, current);
 207 }
 208
 209 asmlinkage void do_sigreturn(struct pt_regs *regs)
 210 {
 211         struct sigcontext __user *scptr;
 212         unsigned long pc, npc, psr;
 213         sigset_t set;
 214         int err;
 215
 216         /* Always make any pending restarted system calls return -EINTR */
 217         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 218
 219         synchronize_user_stack();
 220
 221         if (current->thread.new_signal) {
 222                 do_new_sigreturn(regs);
 223                 return;
 224         }
 225
 226         scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
 227
 228         /* Check sanity of the user arg. */
 229         if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
 230             (((unsigned long) scptr) & 3))
 231                 goto segv_and_exit;
 232
 233         err = __get_user(pc, &scptr->sigc_pc);
 234         err |= __get_user(npc, &scptr->sigc_npc);
 235
 236         if ((pc | npc) & 3)
 237                 goto segv_and_exit;
 238
 239         /* This is pretty much atomic, no amount locking would prevent
 240          * the races which exist anyways.
 241          */
 242         err |= __get_user(set.sig[0], &scptr->sigc_mask);
 243         /* Note that scptr + 1 points to extramask */
 244         err |= __copy_from_user(&set.sig[1], scptr + 1,
 245                                 (_NSIG_WORDS - 1) * sizeof(unsigned int));
 246
 247         if (err)
 248                 goto segv_and_exit;
 249
 250         sigdelsetmask(&set, ~_BLOCKABLE);
 251         spin_lock_irq(&current->sighand->siglock);
 252         current->blocked = set;
 253         recalc_sigpending();
 254         spin_unlock_irq(&current->sighand->siglock);
 255
 256         regs->pc = pc;
 257         regs->npc = npc;
 258
 259         err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
 260         err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
 261         err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
 262
 263         /* User can only change condition codes in %psr. */
 264         err |= __get_user(psr, &scptr->sigc_psr);
 265         if (err)
 266                 goto segv_and_exit;
 267
 268         regs->psr &= ~(PSR_ICC);
 269         regs->psr |= (psr & PSR_ICC);
 270         return;
 271
 272 segv_and_exit:
 273         force_sig(SIGSEGV, current);
 274 }
 275
 276 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 277 {
 278         struct rt_signal_frame __user *sf;
 279         unsigned int psr, pc, npc;
 280         __siginfo_fpu_t __user *fpu_save;
 281         mm_segment_t old_fs;
 282         sigset_t set;
 283         stack_t st;
 284         int err;
 285
 286         synchronize_user_stack();
 287         sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
 288         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
 289             (((unsigned long) sf) & 0x03))
 290                 goto segv;
 291
 292         err = __get_user(pc, &sf->regs.pc);
 293         err |= __get_user(npc, &sf->regs.npc);
 294         err |= ((pc | npc) & 0x03);
 295
 296         err |= __get_user(regs->y, &sf->regs.y);
 297         err |= __get_user(psr, &sf->regs.psr);
 298
 299         err |= __copy_from_user(&regs->u_regs[UREG_G1],
 300                                 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
 301
 302         regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
 303
 304         err |= __get_user(fpu_save, &sf->fpu_save);
 305
 306         if (fpu_save)
 307                 err |= restore_fpu_state(regs, fpu_save);
 308         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 309
 310         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 311
 312         if (err)
 313                 goto segv;
 314
 315         regs->pc = pc;
 316         regs->npc = npc;
 317
 318         /* It is more difficult to avoid calling this function than to
 319          * call it and ignore errors.
 320          */
 321         old_fs = get_fs();
 322         set_fs(KERNEL_DS);
 323         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
 324         set_fs(old_fs);
 325
 326         sigdelsetmask(&set, ~_BLOCKABLE);
 327         spin_lock_irq(&current->sighand->siglock);
 328         current->blocked = set;
 329         recalc_sigpending();
 330         spin_unlock_irq(&current->sighand->siglock);
 331         return;
 332 segv:
 333         force_sig(SIGSEGV, current);
 334 }
 335
 336 /* Checks if the fp is valid */
 337 static inline int invalid_frame_pointer(void __user *fp, int fplen)
 338 {
 339         if ((((unsigned long) fp) & 7) ||
 340             !__access_ok((unsigned long)fp, fplen) ||
 341             ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
 342              ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
 343                 return 1;
 344
 345         return 0;
 346 }
 347
 348 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
 349 {
 350         unsigned long sp;
 351
 352         sp = regs->u_regs[UREG_FP];
 353
 354         /* This is the X/Open sanctioned signal stack switching.  */
 355         if (sa->sa_flags & SA_ONSTACK) {
 356                 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
 357                         sp = current->sas_ss_sp + current->sas_ss_size;
 358         }
 359         return (void __user *)(sp - framesize);
 360 }
 361
 362 static inline void
 363 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
 364 {
 365         struct signal_sframe __user *sframep;
 366         struct sigcontext __user *sc;
 367         int window = 0, err;
 368         unsigned long pc = regs->pc;
 369         unsigned long npc = regs->npc;
 370         struct thread_info *tp = current_thread_info();
 371         void __user *sig_address;
 372         int sig_code;
 373
 374         synchronize_user_stack();
 375         sframep = (struct signal_sframe __user *)
 376                 get_sigframe(sa, regs, SF_ALIGNEDSZ);
 377         if (invalid_frame_pointer(sframep, sizeof(*sframep))){
 378                 /* Don't change signal code and address, so that
 379                  * post mortem debuggers can have a look.
 380                  */
 381                 goto sigill_and_return;
 382         }
 383
 384         sc = &sframep->sig_context;
 385
 386         /* We've already made sure frame pointer isn't in kernel space... */
 387         err  = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
 388                          &sc->sigc_onstack);
 389         err |= __put_user(oldset->sig[0], &sc->sigc_mask);
 390         err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
 391                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 392         err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
 393         err |= __put_user(pc, &sc->sigc_pc);
 394         err |= __put_user(npc, &sc->sigc_npc);
 395         err |= __put_user(regs->psr, &sc->sigc_psr);
 396         err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
 397         err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
 398         err |= __put_user(tp->w_saved, &sc->sigc_oswins);
 399         if (tp->w_saved)
 400                 for (window = 0; window < tp->w_saved; window++) {
 401                         put_user((char *)tp->rwbuf_stkptrs[window],
 402                                  &sc->sigc_spbuf[window]);
 403                         err |= __copy_to_user(&sc->sigc_wbuf[window],
 404                                               &tp->reg_window[window],
 405                                               sizeof(struct reg_window));
 406                 }
 407         else
 408                 err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
 409                                       sizeof(struct reg_window));
 410
 411         tp->w_saved = 0; /* So process is allowed to execute. */
 412
 413         err |= __put_user(signr, &sframep->sig_num);
 414         sig_address = NULL;
 415         sig_code = 0;
 416         if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
 417                 sig_address = info->si_addr;
 418                 switch (signr) {
 419                 case SIGSEGV:
 420                         switch (info->si_code) {
 421                         case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
 422                         default: sig_code = SUBSIG_PROTECTION; break;
 423                         }
 424                         break;
 425                 case SIGILL:
 426                         switch (info->si_code) {
 427                         case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
 428                         case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
 429                         case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
 430                         default: sig_code = SUBSIG_STACK; break;
 431                         }
 432                         break;
 433                 case SIGFPE:
 434                         switch (info->si_code) {
 435                         case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
 436                         case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
 437                         case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
 438                         case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
 439                         case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
 440                         case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
 441                         case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
 442                         default: sig_code = SUBSIG_FPERROR; break;
 443                         }
 444                         break;
 445                 case SIGBUS:
 446                         switch (info->si_code) {
 447                         case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
 448                         case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
 449                         default: sig_code = SUBSIG_BUSTIMEOUT; break;
 450                         }
 451                         break;
 452                 case SIGEMT:
 453                         switch (info->si_code) {
 454                         case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
 455                         }
 456                         break;
 457                 case SIGSYS:
 458                         if (info->si_code == (__SI_FAULT|0x100)) {
 459                                 /* See sys_sunos.c */
 460                                 sig_code = info->si_trapno;
 461                                 break;
 462                         }
 463                 default:
 464                         sig_address = NULL;
 465                 }
 466         }
 467         err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
 468         err |= __put_user(sig_code, &sframep->sig_code);
 469         err |= __put_user(sc, &sframep->sig_scptr);
 470         if (err)
 471                 goto sigsegv;
 472
 473         regs->u_regs[UREG_FP] = (unsigned long) sframep;
 474         regs->pc = (unsigned long) sa->sa_handler;
 475         regs->npc = (regs->pc + 4);
 476         return;
 477
 478 sigill_and_return:
 479         do_exit(SIGILL);
 480 sigsegv:
 481         force_sigsegv(signr, current);
 482 }
 483
 484
 485 static inline int
 486 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 487 {
 488         int err = 0;
 489 #ifdef CONFIG_SMP
 490         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
 491                 put_psr(get_psr() | PSR_EF);
 492                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 493                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 494                 regs->psr &= ~(PSR_EF);
 495                 clear_tsk_thread_flag(current, TIF_USEDFPU);
 496         }
 497 #else
 498         if (current == last_task_used_math) {
 499                 put_psr(get_psr() | PSR_EF);
 500                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 501                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 502                 last_task_used_math = NULL;
 503                 regs->psr &= ~(PSR_EF);
 504         }
 505 #endif
 506         err |= __copy_to_user(&fpu->si_float_regs[0],
 507                               &current->thread.float_regs[0],
 508                               (sizeof(unsigned long) * 32));
 509         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
 510         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 511         if (current->thread.fpqdepth != 0)
 512                 err |= __copy_to_user(&fpu->si_fpqueue[0],
 513                                       &current->thread.fpqueue[0],
 514                                       ((sizeof(unsigned long) +
 515                                       (sizeof(unsigned long *)))*16));
 516         clear_used_math();
 517         return err;
 518 }
 519
 520 static inline void
 521 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 522                 int signo, sigset_t *oldset)
 523 {
 524         struct new_signal_frame __user *sf;
 525         int sigframe_size, err;
 526
 527         /* 1. Make sure everything is clean */
 528         synchronize_user_stack();
 529
 530         sigframe_size = NF_ALIGNEDSZ;
 531         if (!used_math())
 532                 sigframe_size -= sizeof(__siginfo_fpu_t);
 533
 534         sf = (struct new_signal_frame __user *)
 535                 get_sigframe(&ka->sa, regs, sigframe_size);
 536
 537         if (invalid_frame_pointer(sf, sigframe_size))
 538                 goto sigill_and_return;
 539
 540         if (current_thread_info()->w_saved != 0)
 541                 goto sigill_and_return;
 542
 543         /* 2. Save the current process state */
 544         err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
 545
 546         err |= __put_user(0, &sf->extra_size);
 547
 548         if (used_math()) {
 549                 err |= save_fpu_state(regs, &sf->fpu_state);
 550                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 551         } else {
 552                 err |= __put_user(0, &sf->fpu_save);
 553         }
 554
 555         err |= __put_user(oldset->sig[0], &sf->info.si_mask);
 556         err |= __copy_to_user(sf->extramask, &oldset->sig[1],
 557                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 558         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 559                               sizeof(struct reg_window));
 560         if (err)
 561                 goto sigsegv;
 562
 563         /* 3. signal handler back-trampoline and parameters */
 564         regs->u_regs[UREG_FP] = (unsigned long) sf;
 565         regs->u_regs[UREG_I0] = signo;
 566         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 567         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 568
 569         /* 4. signal handler */
 570         regs->pc = (unsigned long) ka->sa.sa_handler;
 571         regs->npc = (regs->pc + 4);
 572
 573         /* 5. return to kernel instructions */
 574         if (ka->ka_restorer)
 575                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 576         else {
 577                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 578
 579                 /* mov __NR_sigreturn, %g1 */
 580                 err |= __put_user(0x821020d8, &sf->insns[0]);
 581
 582                 /* t 0x10 */
 583                 err |= __put_user(0x91d02010, &sf->insns[1]);
 584                 if (err)
 585                         goto sigsegv;
 586
 587                 /* Flush instruction space. */
 588                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 589         }
 590         return;
 591
 592 sigill_and_return:
 593         do_exit(SIGILL);
 594 sigsegv:
 595         force_sigsegv(signo, current);
 596 }
 597
 598 static inline void
 599 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 600                    int signo, sigset_t *oldset, siginfo_t *info)
 601 {
 602         struct rt_signal_frame __user *sf;
 603         int sigframe_size;
 604         unsigned int psr;
 605         int err;
 606
 607         synchronize_user_stack();
 608         sigframe_size = RT_ALIGNEDSZ;
 609         if (!used_math())
 610                 sigframe_size -= sizeof(__siginfo_fpu_t);
 611         sf = (struct rt_signal_frame __user *)
 612                 get_sigframe(&ka->sa, regs, sigframe_size);
 613         if (invalid_frame_pointer(sf, sigframe_size))
 614                 goto sigill;
 615         if (current_thread_info()->w_saved != 0)
 616                 goto sigill;
 617
 618         err  = __put_user(regs->pc, &sf->regs.pc);
 619         err |= __put_user(regs->npc, &sf->regs.npc);
 620         err |= __put_user(regs->y, &sf->regs.y);
 621         psr = regs->psr;
 622         if (used_math())
 623                 psr |= PSR_EF;
 624         err |= __put_user(psr, &sf->regs.psr);
 625         err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
 626         err |= __put_user(0, &sf->extra_size);
 627
 628         if (psr & PSR_EF) {
 629                 err |= save_fpu_state(regs, &sf->fpu_state);
 630                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 631         } else {
 632                 err |= __put_user(0, &sf->fpu_save);
 633         }
 634         err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
 635
 636         /* Setup sigaltstack */
 637         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 638         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 639         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 640
 641         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 642                               sizeof(struct reg_window));
 643
 644         err |= copy_siginfo_to_user(&sf->info, info);
 645
 646         if (err)
 647                 goto sigsegv;
 648
 649         regs->u_regs[UREG_FP] = (unsigned long) sf;
 650         regs->u_regs[UREG_I0] = signo;
 651         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 652         regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
 653
 654         regs->pc = (unsigned long) ka->sa.sa_handler;
 655         regs->npc = (regs->pc + 4);
 656
 657         if (ka->ka_restorer)
 658                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 659         else {
 660                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 661
 662                 /* mov __NR_sigreturn, %g1 */
 663                 err |= __put_user(0x821020d8, &sf->insns[0]);
 664
 665                 /* t 0x10 */
 666                 err |= __put_user(0x91d02010, &sf->insns[1]);
 667                 if (err)
 668                         goto sigsegv;
 669
 670                 /* Flush instruction space. */
 671                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 672         }
 673         return;
 674
 675 sigill:
 676         do_exit(SIGILL);
 677 sigsegv:
 678         force_sigsegv(signo, current);
 679 }
 680
 681 /* Setup a Solaris stack frame */
 682 static inline void
 683 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
 684                  struct pt_regs *regs, int signr, sigset_t *oldset)
 685 {
 686         svr4_signal_frame_t __user *sfp;
 687         svr4_gregset_t  __user *gr;
 688         svr4_siginfo_t  __user *si;
 689         svr4_mcontext_t __user *mc;
 690         svr4_gwindows_t __user *gw;
 691         svr4_ucontext_t __user *uc;
 692         svr4_sigset_t   setv;
 693         struct thread_info *tp = current_thread_info();
 694         int window = 0, err;
 695
 696         synchronize_user_stack();
 697         sfp = (svr4_signal_frame_t __user *)
 698                 get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
 699
 700         if (invalid_frame_pointer(sfp, sizeof(*sfp)))
 701                 goto sigill_and_return;
 702
 703         /* Start with a clean frame pointer and fill it */
 704         err = __clear_user(sfp, sizeof(*sfp));
 705
 706         /* Setup convenience variables */
 707         si = &sfp->si;
 708         uc = &sfp->uc;
 709         gw = &sfp->gw;
 710         mc = &uc->mcontext;
 711         gr = &mc->greg;
 712
 713         /* FIXME: where am I supposed to put this?
 714          * sc->sigc_onstack = old_status;
 715          * anyways, it does not look like it is used for anything at all.
 716          */
 717         setv.sigbits[0] = oldset->sig[0];
 718         setv.sigbits[1] = oldset->sig[1];
 719         if (_NSIG_WORDS >= 4) {
 720                 setv.sigbits[2] = oldset->sig[2];
 721                 setv.sigbits[3] = oldset->sig[3];
 722                 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
 723         } else
 724                 err |= __copy_to_user(&uc->sigmask, &setv,
 725                                       2 * sizeof(unsigned int));
 726
 727         /* Store registers */
 728         err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
 729         err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
 730         err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
 731         err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
 732
 733         /* Copy g[1..7] and o[0..7] registers */
 734         err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
 735                               sizeof(long) * 7);
 736         err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
 737                               sizeof(long) * 8);
 738
 739         /* Setup sigaltstack */
 740         err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
 741         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
 742         err |= __put_user(current->sas_ss_size, &uc->stack.size);
 743
 744         /* Save the currently window file: */
 745
 746         /* 1. Link sfp->uc->gwins to our windows */
 747         err |= __put_user(gw, &mc->gwin);
 748
 749         /* 2. Number of windows to restore at setcontext(): */
 750         err |= __put_user(tp->w_saved, &gw->count);
 751
 752         /* 3. Save each valid window
 753          *    Currently, it makes a copy of the windows from the kernel copy.
 754          *    David's code for SunOS, makes the copy but keeps the pointer to
 755          *    the kernel.  My version makes the pointer point to a userland
 756          *    copy of those.  Mhm, I wonder if I shouldn't just ignore those
 757          *    on setcontext and use those that are on the kernel, the signal
 758          *    handler should not be modyfing those, mhm.
 759          *
 760          *    These windows are just used in case synchronize_user_stack failed
 761          *    to flush the user windows.
 762          */
 763         for (window = 0; window < tp->w_saved; window++) {
 764                 err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
 765                 err |= __copy_to_user(&gw->win[window],
 766                                       &tp->reg_window[window],
 767                                       sizeof(svr4_rwindow_t));
 768                 err |= __put_user(0, gw->winptr[window]);
 769         }
 770
 771         /* 4. We just pay attention to the gw->count field on setcontext */
 772         tp->w_saved = 0; /* So process is allowed to execute. */
 773
 774         /* Setup the signal information.  Solaris expects a bunch of
 775          * information to be passed to the signal handler, we don't provide
 776          * that much currently, should use siginfo.
 777          */
 778         err |= __put_user(signr, &si->siginfo.signo);
 779         err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
 780         if (err)
 781                 goto sigsegv;
 782
 783         regs->u_regs[UREG_FP] = (unsigned long) sfp;
 784         regs->pc = (unsigned long) sa->sa_handler;
 785         regs->npc = (regs->pc + 4);
 786
 787         /* Arguments passed to signal handler */
 788         if (regs->u_regs[14]){
 789                 struct reg_window __user *rw = (struct reg_window __user *)
 790                         regs->u_regs[14];
 791
 792                 err |= __put_user(signr, &rw->ins[0]);
 793                 err |= __put_user(si, &rw->ins[1]);
 794                 err |= __put_user(uc, &rw->ins[2]);
 795                 err |= __put_user(sfp, &rw->ins[6]);    /* frame pointer */
 796                 if (err)
 797                         goto sigsegv;
 798
 799                 regs->u_regs[UREG_I0] = signr;
 800                 regs->u_regs[UREG_I1] = (unsigned long) si;
 801                 regs->u_regs[UREG_I2] = (unsigned long) uc;
 802         }
 803         return;
 804
 805 sigill_and_return:
 806         do_exit(SIGILL);
 807 sigsegv:
 808         force_sigsegv(signr, current);
 809 }
 810
 811 asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
 812 {
 813         svr4_gregset_t  __user *gr;
 814         svr4_mcontext_t __user *mc;
 815         svr4_sigset_t   setv;
 816         int err = 0;
 817
 818         synchronize_user_stack();
 819
 820         if (current_thread_info()->w_saved)
 821                 return -EFAULT;
 822
 823         err = clear_user(uc, sizeof(*uc));
 824         if (err)
 825                 return -EFAULT;
 826
 827         /* Setup convenience variables */
 828         mc = &uc->mcontext;
 829         gr = &mc->greg;
 830
 831         setv.sigbits[0] = current->blocked.sig[0];
 832         setv.sigbits[1] = current->blocked.sig[1];
 833         if (_NSIG_WORDS >= 4) {
 834                 setv.sigbits[2] = current->blocked.sig[2];
 835                 setv.sigbits[3] = current->blocked.sig[3];
 836                 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
 837         } else
 838                 err |= __copy_to_user(&uc->sigmask, &setv,
 839                                       2 * sizeof(unsigned int));
 840
 841         /* Store registers */
 842         err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
 843         err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
 844         err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
 845         err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
 846
 847         /* Copy g[1..7] and o[0..7] registers */
 848         err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
 849                               sizeof(uint) * 7);
 850         err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
 851                               sizeof(uint) * 8);
 852
 853         /* Setup sigaltstack */
 854         err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
 855         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
 856         err |= __put_user(current->sas_ss_size, &uc->stack.size);
 857
 858         /* The register file is not saved
 859          * we have already stuffed all of it with sync_user_stack
 860          */
 861         return (err ? -EFAULT : 0);
 862 }
 863
 864 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
 865 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
 866 {
 867         svr4_gregset_t  __user *gr;
 868         unsigned long pc, npc, psr;
 869         mm_segment_t old_fs;
 870         sigset_t set;
 871         svr4_sigset_t setv;
 872         int err;
 873         stack_t st;
 874
 875         /* Fixme: restore windows, or is this already taken care of in
 876          * svr4_setup_frame when sync_user_windows is done?
 877          */
 878         flush_user_windows();
 879
 880         if (current_thread_info()->w_saved)
 881                 goto sigsegv_and_return;
 882
 883         if (((unsigned long) c) & 3)
 884                 goto sigsegv_and_return;
 885
 886         if (!__access_ok((unsigned long)c, sizeof(*c)))
 887                 goto sigsegv_and_return;
 888
 889         /* Check for valid PC and nPC */
 890         gr = &c->mcontext.greg;
 891         err = __get_user(pc, &((*gr)[SVR4_PC]));
 892         err |= __get_user(npc, &((*gr)[SVR4_NPC]));
 893
 894         if ((pc | npc) & 3)
 895                 goto sigsegv_and_return;
 896
 897         /* Retrieve information from passed ucontext */
 898         /* note that nPC is ored a 1, this is used to inform entry.S */
 899         /* that we don't want it to mess with our PC and nPC */
 900
 901         /* This is pretty much atomic, no amount locking would prevent
 902          * the races which exist anyways.
 903          */
 904         err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
 905
 906         err |= __get_user(st.ss_sp, &c->stack.sp);
 907         err |= __get_user(st.ss_flags, &c->stack.flags);
 908         err |= __get_user(st.ss_size, &c->stack.size);
 909
 910         if (err)
 911                 goto sigsegv_and_return;
 912
 913         /* It is more difficult to avoid calling this function than to
 914            call it and ignore errors.  */
 915         old_fs = get_fs();
 916         set_fs(KERNEL_DS);
 917         do_sigaltstack((const stack_t __user *) &st, NULL,
 918                        regs->u_regs[UREG_I6]);
 919         set_fs(old_fs);
 920
 921         set.sig[0] = setv.sigbits[0];
 922         set.sig[1] = setv.sigbits[1];
 923         if (_NSIG_WORDS >= 4) {
 924                 set.sig[2] = setv.sigbits[2];
 925                 set.sig[3] = setv.sigbits[3];
 926         }
 927         sigdelsetmask(&set, ~_BLOCKABLE);
 928         spin_lock_irq(&current->sighand->siglock);
 929         current->blocked = set;
 930         recalc_sigpending();
 931         spin_unlock_irq(&current->sighand->siglock);
 932         regs->pc = pc;
 933         regs->npc = npc | 1;
 934         err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
 935         err |= __get_user(psr, &((*gr)[SVR4_PSR]));
 936         regs->psr &= ~(PSR_ICC);
 937         regs->psr |= (psr & PSR_ICC);
 938
 939         /* Restore g[1..7] and o[0..7] registers */
 940         err |= __copy_from_user(&regs->u_regs[UREG_G1], &(*gr)[SVR4_G1],
 941                               sizeof(long) * 7);
 942         err |= __copy_from_user(&regs->u_regs[UREG_I0], &(*gr)[SVR4_O0],
 943                               sizeof(long) * 8);
 944         return (err ? -EFAULT : 0);
 945
 946 sigsegv_and_return:
 947         force_sig(SIGSEGV, current);
 948         return -EFAULT;
 949 }
 950
 951 static inline void
 952 handle_signal(unsigned long signr, struct k_sigaction *ka,
 953               siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
 954               int svr4_signal)
 955 {
 956         if (svr4_signal)
 957                 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
 958         else {
 959                 if (ka->sa.sa_flags & SA_SIGINFO)
 960                         new_setup_rt_frame(ka, regs, signr, oldset, info);
 961                 else if (current->thread.new_signal)
 962                         new_setup_frame(ka, regs, signr, oldset);
 963                 else
 964                         setup_frame(&ka->sa, regs, signr, oldset, info);
 965         }
 966         spin_lock_irq(&current->sighand->siglock);
 967         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 968         if (!(ka->sa.sa_flags & SA_NOMASK))
 969                 sigaddset(&current->blocked, signr);
 970         recalc_sigpending();
 971         spin_unlock_irq(&current->sighand->siglock);
 972 }
 973
 974 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 975                                    struct sigaction *sa)
 976 {
 977         switch(regs->u_regs[UREG_I0]) {
 978         case ERESTART_RESTARTBLOCK:
 979         case ERESTARTNOHAND:
 980         no_system_call_restart:
 981                 regs->u_regs[UREG_I0] = EINTR;
 982                 regs->psr |= PSR_C;
 983                 break;
 984         case ERESTARTSYS:
 985                 if (!(sa->sa_flags & SA_RESTART))
 986                         goto no_system_call_restart;
 987                 /* fallthrough */
 988         case ERESTARTNOINTR:
 989                 regs->u_regs[UREG_I0] = orig_i0;
 990                 regs->pc -= 4;
 991                 regs->npc -= 4;
 992         }
 993 }
 994
 995 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 996  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 997  * mistake.
 998  */
 999 asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
1000 {
1001         siginfo_t info;
1002         struct sparc_deliver_cookie cookie;
1003         struct k_sigaction ka;
1004         int signr;
1005         sigset_t *oldset;
1006
1007         /*
1008          * XXX Disable svr4 signal handling until solaris emulation works.
1009          * It is buggy - Anton
1010          */
1011 #define SVR4_SIGNAL_BROKEN 1
1012 #ifdef SVR4_SIGNAL_BROKEN
1013         int svr4_signal = 0;
1014 #else
1015         int svr4_signal = current->personality == PER_SVR4;
1016 #endif
1017
1018         cookie.restart_syscall = restart_syscall;
1019         cookie.orig_i0 = orig_i0;
1020
1021         if (test_thread_flag(TIF_RESTORE_SIGMASK))
1022                 oldset = &current->saved_sigmask;
1023         else
1024                 oldset = &current->blocked;
1025
1026         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
1027         if (signr > 0) {
1028                 if (cookie.restart_syscall)
1029                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
1030                 handle_signal(signr, &ka, &info, oldset,
1031                               regs, svr4_signal);
1032                 /* a signal was successfully delivered; the saved
1033                  * sigmask will have been stored in the signal frame,
1034                  * and will be restored by sigreturn, so we can simply
1035                  * clear the TIF_RESTORE_SIGMASK flag.
1036                  */
1037                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1038                         clear_thread_flag(TIF_RESTORE_SIGMASK);
1039                 return;
1040         }
1041         if (cookie.restart_syscall &&
1042             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1043              regs->u_regs[UREG_I0] == ERESTARTSYS ||
1044              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1045                 /* replay the system call when we are done */
1046                 regs->u_regs[UREG_I0] = cookie.orig_i0;
1047                 regs->pc -= 4;
1048                 regs->npc -= 4;
1049         }
1050         if (cookie.restart_syscall &&
1051             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1052                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1053                 regs->pc -= 4;
1054                 regs->npc -= 4;
1055         }
1056
1057         /* if there's no signal to deliver, we just put the saved sigmask
1058          * back
1059          */
1060         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1061                 clear_thread_flag(TIF_RESTORE_SIGMASK);
1062                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
1063         }
1064 }
1065
1066 asmlinkage int
1067 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
1068                 unsigned long sp)
1069 {
1070         int ret = -EFAULT;
1071
1072         /* First see if old state is wanted. */
1073         if (ossptr) {
1074                 if (put_user(current->sas_ss_sp + current->sas_ss_size,
1075                              &ossptr->the_stack) ||
1076                     __put_user(on_sig_stack(sp), &ossptr->cur_status))
1077                         goto out;
1078         }
1079
1080         /* Now see if we want to update the new state. */
1081         if (ssptr) {
1082                 char *ss_sp;
1083
1084                 if (get_user(ss_sp, &ssptr->the_stack))
1085                         goto out;
1086                 /* If the current stack was set with sigaltstack, don't
1087                    swap stacks while we are on it.  */
1088                 ret = -EPERM;
1089                 if (current->sas_ss_sp && on_sig_stack(sp))
1090                         goto out;
1091
1092                 /* Since we don't know the extent of the stack, and we don't
1093                    track onstack-ness, but rather calculate it, we must
1094                    presume a size.  Ho hum this interface is lossy.  */
1095                 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1096                 current->sas_ss_size = SIGSTKSZ;
1097         }
1098         ret = 0;
1099 out:
1100         return ret;
1101 }
1102
1103 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
1104 {
1105         struct sparc_deliver_cookie *cp = cookie;
1106
1107         if (cp->restart_syscall &&
1108             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1109              regs->u_regs[UREG_I0] == ERESTARTSYS ||
1110              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1111                 /* replay the system call when we are done */
1112                 regs->u_regs[UREG_I0] = cp->orig_i0;
1113                 regs->pc -= 4;
1114                 regs->npc -= 4;
1115                 cp->restart_syscall = 0;
1116         }
1117
1118         if (cp->restart_syscall &&
1119             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1120                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1121                 regs->pc -= 4;
1122                 regs->npc -= 4;
1123                 cp->restart_syscall = 0;
1124         }
1125 }