arch/sparc/kernel/signal.c

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