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   1 /*  $Id: signal.c,v 1.110 2002/02/08 03:57:14 davem Exp $
   2  *  linux/arch/sparc/kernel/signal.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/signal.h>
  13 #include <linux/errno.h>
  14 #include <linux/wait.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/unistd.h>
  17 #include <linux/mm.h>
  18 #include <linux/tty.h>
  19 #include <linux/smp.h>
  20 #include <linux/binfmts.h>      /* do_coredum */
  21 #include <linux/bitops.h>
  22
  23 #include <asm/uaccess.h>
  24 #include <asm/ptrace.h>
  25 #include <asm/svr4.h>
  26 #include <asm/pgalloc.h>
  27 #include <asm/pgtable.h>
  28 #include <asm/cacheflush.h>     /* flush_sig_insns */
  29
  30 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  31
  32 extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
  33                    void *fpqueue, unsigned long *fpqdepth);
  34 extern void fpload(unsigned long *fpregs, unsigned long *fsr);
  35
  36 /* Signal frames: the original one (compatible with SunOS):
  37  *
  38  * Set up a signal frame... Make the stack look the way SunOS
  39  * expects it to look which is basically:
  40  *
  41  * ---------------------------------- <-- %sp at signal time
  42  * Struct sigcontext
  43  * Signal address
  44  * Ptr to sigcontext area above
  45  * Signal code
  46  * The signal number itself
  47  * One register window
  48  * ---------------------------------- <-- New %sp
  49  */
  50 struct signal_sframe {
  51         struct reg_window       sig_window;
  52         int                     sig_num;
  53         int                     sig_code;
  54         struct sigcontext __user *sig_scptr;
  55         int                     sig_address;
  56         struct sigcontext       sig_context;
  57         unsigned int            extramask[_NSIG_WORDS - 1];
  58 };
  59
  60 /*
  61  * And the new one, intended to be used for Linux applications only
  62  * (we have enough in there to work with clone).
  63  * All the interesting bits are in the info field.
  64  */
  65
  66 struct new_signal_frame {
  67         struct sparc_stackf     ss;
  68         __siginfo_t             info;
  69         __siginfo_fpu_t __user  *fpu_save;
  70         unsigned long           insns[2] __attribute__ ((aligned (8)));
  71         unsigned int            extramask[_NSIG_WORDS - 1];
  72         unsigned int            extra_size; /* Should be 0 */
  73         __siginfo_fpu_t         fpu_state;
  74 };
  75
  76 struct rt_signal_frame {
  77         struct sparc_stackf     ss;
  78         siginfo_t               info;
  79         struct pt_regs          regs;
  80         sigset_t                mask;
  81         __siginfo_fpu_t __user  *fpu_save;
  82         unsigned int            insns[2];
  83         stack_t                 stack;
  84         unsigned int            extra_size; /* Should be 0 */
  85         __siginfo_fpu_t         fpu_state;
  86 };
  87
  88 /* Align macros */
  89 #define SF_ALIGNEDSZ  (((sizeof(struct signal_sframe) + 7) & (~7)))
  90 #define NF_ALIGNEDSZ  (((sizeof(struct new_signal_frame) + 7) & (~7)))
  91 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
  92
  93 static int _sigpause_common(old_sigset_t set)
  94 {
  95         set &= _BLOCKABLE;
  96         spin_lock_irq(&current->sighand->siglock);
  97         current->saved_sigmask = current->blocked;
  98         siginitset(&current->blocked, set);
  99         recalc_sigpending();
 100         spin_unlock_irq(&current->sighand->siglock);
 101
 102         current->state = TASK_INTERRUPTIBLE;
 103         schedule();
 104         set_thread_flag(TIF_RESTORE_SIGMASK);
 105
 106         return -ERESTARTNOHAND;
 107 }
 108
 109 asmlinkage int sys_sigpause(unsigned int set)
 110 {
 111         return _sigpause_common(set);
 112 }
 113
 114 asmlinkage int sys_sigsuspend(old_sigset_t set)
 115 {
 116         return _sigpause_common(set);
 117 }
 118
 119 static inline int
 120 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 121 {
 122         int err;
 123 #ifdef CONFIG_SMP
 124         if (test_tsk_thread_flag(current, TIF_USEDFPU))
 125                 regs->psr &= ~PSR_EF;
 126 #else
 127         if (current == last_task_used_math) {
 128                 last_task_used_math = NULL;
 129                 regs->psr &= ~PSR_EF;
 130         }
 131 #endif
 132         set_used_math();
 133         clear_tsk_thread_flag(current, TIF_USEDFPU);
 134
 135         if (!access_ok(VERIFY_READ, fpu, sizeof(*fpu)))
 136                 return -EFAULT;
 137
 138         err = __copy_from_user(&current->thread.float_regs[0], &fpu->si_float_regs[0],
 139                                (sizeof(unsigned long) * 32));
 140         err |= __get_user(current->thread.fsr, &fpu->si_fsr);
 141         err |= __get_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 142         if (current->thread.fpqdepth != 0)
 143                 err |= __copy_from_user(&current->thread.fpqueue[0],
 144                                         &fpu->si_fpqueue[0],
 145                                         ((sizeof(unsigned long) +
 146                                         (sizeof(unsigned long *)))*16));
 147         return err;
 148 }
 149
 150 static inline void do_new_sigreturn (struct pt_regs *regs)
 151 {
 152         struct new_signal_frame __user *sf;
 153         unsigned long up_psr, pc, npc;
 154         sigset_t set;
 155         __siginfo_fpu_t __user *fpu_save;
 156         int err;
 157
 158         sf = (struct new_signal_frame __user *) regs->u_regs[UREG_FP];
 159
 160         /* 1. Make sure we are not getting garbage from the user */
 161         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
 162                 goto segv_and_exit;
 163
 164         if (((unsigned long) sf) & 3)
 165                 goto segv_and_exit;
 166
 167         err = __get_user(pc,  &sf->info.si_regs.pc);
 168         err |= __get_user(npc, &sf->info.si_regs.npc);
 169
 170         if ((pc | npc) & 3)
 171                 goto segv_and_exit;
 172
 173         /* 2. Restore the state */
 174         up_psr = regs->psr;
 175         err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
 176
 177         /* User can only change condition codes and FPU enabling in %psr. */
 178         regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
 179                   | (regs->psr & (PSR_ICC | PSR_EF));
 180
 181         err |= __get_user(fpu_save, &sf->fpu_save);
 182
 183         if (fpu_save)
 184                 err |= restore_fpu_state(regs, fpu_save);
 185
 186         /* This is pretty much atomic, no amount locking would prevent
 187          * the races which exist anyways.
 188          */
 189         err |= __get_user(set.sig[0], &sf->info.si_mask);
 190         err |= __copy_from_user(&set.sig[1], &sf->extramask,
 191                                 (_NSIG_WORDS-1) * sizeof(unsigned int));
 192
 193         if (err)
 194                 goto segv_and_exit;
 195
 196         sigdelsetmask(&set, ~_BLOCKABLE);
 197         spin_lock_irq(&current->sighand->siglock);
 198         current->blocked = set;
 199         recalc_sigpending();
 200         spin_unlock_irq(&current->sighand->siglock);
 201         return;
 202
 203 segv_and_exit:
 204         force_sig(SIGSEGV, current);
 205 }
 206
 207 asmlinkage void do_sigreturn(struct pt_regs *regs)
 208 {
 209         struct sigcontext __user *scptr;
 210         unsigned long pc, npc, psr;
 211         sigset_t set;
 212         int err;
 213
 214         /* Always make any pending restarted system calls return -EINTR */
 215         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 216
 217         synchronize_user_stack();
 218
 219         if (current->thread.new_signal) {
 220                 do_new_sigreturn(regs);
 221                 return;
 222         }
 223
 224         scptr = (struct sigcontext __user *) regs->u_regs[UREG_I0];
 225
 226         /* Check sanity of the user arg. */
 227         if (!access_ok(VERIFY_READ, scptr, sizeof(struct sigcontext)) ||
 228             (((unsigned long) scptr) & 3))
 229                 goto segv_and_exit;
 230
 231         err = __get_user(pc, &scptr->sigc_pc);
 232         err |= __get_user(npc, &scptr->sigc_npc);
 233
 234         if ((pc | npc) & 3)
 235                 goto segv_and_exit;
 236
 237         /* This is pretty much atomic, no amount locking would prevent
 238          * the races which exist anyways.
 239          */
 240         err |= __get_user(set.sig[0], &scptr->sigc_mask);
 241         /* Note that scptr + 1 points to extramask */
 242         err |= __copy_from_user(&set.sig[1], scptr + 1,
 243                                 (_NSIG_WORDS - 1) * sizeof(unsigned int));
 244
 245         if (err)
 246                 goto segv_and_exit;
 247
 248         sigdelsetmask(&set, ~_BLOCKABLE);
 249         spin_lock_irq(&current->sighand->siglock);
 250         current->blocked = set;
 251         recalc_sigpending();
 252         spin_unlock_irq(&current->sighand->siglock);
 253
 254         regs->pc = pc;
 255         regs->npc = npc;
 256
 257         err = __get_user(regs->u_regs[UREG_FP], &scptr->sigc_sp);
 258         err |= __get_user(regs->u_regs[UREG_I0], &scptr->sigc_o0);
 259         err |= __get_user(regs->u_regs[UREG_G1], &scptr->sigc_g1);
 260
 261         /* User can only change condition codes in %psr. */
 262         err |= __get_user(psr, &scptr->sigc_psr);
 263         if (err)
 264                 goto segv_and_exit;
 265
 266         regs->psr &= ~(PSR_ICC);
 267         regs->psr |= (psr & PSR_ICC);
 268         return;
 269
 270 segv_and_exit:
 271         force_sig(SIGSEGV, current);
 272 }
 273
 274 asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
 275 {
 276         struct rt_signal_frame __user *sf;
 277         unsigned int psr, pc, npc;
 278         __siginfo_fpu_t __user *fpu_save;
 279         mm_segment_t old_fs;
 280         sigset_t set;
 281         stack_t st;
 282         int err;
 283
 284         synchronize_user_stack();
 285         sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
 286         if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
 287             (((unsigned long) sf) & 0x03))
 288                 goto segv;
 289
 290         err = __get_user(pc, &sf->regs.pc);
 291         err |= __get_user(npc, &sf->regs.npc);
 292         err |= ((pc | npc) & 0x03);
 293
 294         err |= __get_user(regs->y, &sf->regs.y);
 295         err |= __get_user(psr, &sf->regs.psr);
 296
 297         err |= __copy_from_user(&regs->u_regs[UREG_G1],
 298                                 &sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
 299
 300         regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
 301
 302         err |= __get_user(fpu_save, &sf->fpu_save);
 303
 304         if (fpu_save)
 305                 err |= restore_fpu_state(regs, fpu_save);
 306         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 307
 308         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 309
 310         if (err)
 311                 goto segv;
 312
 313         regs->pc = pc;
 314         regs->npc = npc;
 315
 316         /* It is more difficult to avoid calling this function than to
 317          * call it and ignore errors.
 318          */
 319         old_fs = get_fs();
 320         set_fs(KERNEL_DS);
 321         do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
 322         set_fs(old_fs);
 323
 324         sigdelsetmask(&set, ~_BLOCKABLE);
 325         spin_lock_irq(&current->sighand->siglock);
 326         current->blocked = set;
 327         recalc_sigpending();
 328         spin_unlock_irq(&current->sighand->siglock);
 329         return;
 330 segv:
 331         force_sig(SIGSEGV, current);
 332 }
 333
 334 /* Checks if the fp is valid */
 335 static inline int invalid_frame_pointer(void __user *fp, int fplen)
 336 {
 337         if ((((unsigned long) fp) & 7) ||
 338             !__access_ok((unsigned long)fp, fplen) ||
 339             ((sparc_cpu_model == sun4 || sparc_cpu_model == sun4c) &&
 340              ((unsigned long) fp < 0xe0000000 && (unsigned long) fp >= 0x20000000)))
 341                 return 1;
 342
 343         return 0;
 344 }
 345
 346 static inline void __user *get_sigframe(struct sigaction *sa, struct pt_regs *regs, unsigned long framesize)
 347 {
 348         unsigned long sp;
 349
 350         sp = regs->u_regs[UREG_FP];
 351
 352         /* This is the X/Open sanctioned signal stack switching.  */
 353         if (sa->sa_flags & SA_ONSTACK) {
 354                 if (!on_sig_stack(sp) && !((current->sas_ss_sp + current->sas_ss_size) & 7))
 355                         sp = current->sas_ss_sp + current->sas_ss_size;
 356         }
 357         return (void __user *)(sp - framesize);
 358 }
 359
 360 static inline void
 361 setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *oldset, siginfo_t *info)
 362 {
 363         struct signal_sframe __user *sframep;
 364         struct sigcontext __user *sc;
 365         int window = 0, err;
 366         unsigned long pc = regs->pc;
 367         unsigned long npc = regs->npc;
 368         struct thread_info *tp = current_thread_info();
 369         void __user *sig_address;
 370         int sig_code;
 371
 372         synchronize_user_stack();
 373         sframep = (struct signal_sframe __user *)
 374                 get_sigframe(sa, regs, SF_ALIGNEDSZ);
 375         if (invalid_frame_pointer(sframep, sizeof(*sframep))){
 376                 /* Don't change signal code and address, so that
 377                  * post mortem debuggers can have a look.
 378                  */
 379                 goto sigill_and_return;
 380         }
 381
 382         sc = &sframep->sig_context;
 383
 384         /* We've already made sure frame pointer isn't in kernel space... */
 385         err  = __put_user((sas_ss_flags(regs->u_regs[UREG_FP]) == SS_ONSTACK),
 386                          &sc->sigc_onstack);
 387         err |= __put_user(oldset->sig[0], &sc->sigc_mask);
 388         err |= __copy_to_user(sframep->extramask, &oldset->sig[1],
 389                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 390         err |= __put_user(regs->u_regs[UREG_FP], &sc->sigc_sp);
 391         err |= __put_user(pc, &sc->sigc_pc);
 392         err |= __put_user(npc, &sc->sigc_npc);
 393         err |= __put_user(regs->psr, &sc->sigc_psr);
 394         err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
 395         err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
 396         err |= __put_user(tp->w_saved, &sc->sigc_oswins);
 397         if (tp->w_saved)
 398                 for (window = 0; window < tp->w_saved; window++) {
 399                         put_user((char *)tp->rwbuf_stkptrs[window],
 400                                  &sc->sigc_spbuf[window]);
 401                         err |= __copy_to_user(&sc->sigc_wbuf[window],
 402                                               &tp->reg_window[window],
 403                                               sizeof(struct reg_window));
 404                 }
 405         else
 406                 err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
 407                                       sizeof(struct reg_window));
 408
 409         tp->w_saved = 0; /* So process is allowed to execute. */
 410
 411         err |= __put_user(signr, &sframep->sig_num);
 412         sig_address = NULL;
 413         sig_code = 0;
 414         if (SI_FROMKERNEL (info) && (info->si_code & __SI_MASK) == __SI_FAULT) {
 415                 sig_address = info->si_addr;
 416                 switch (signr) {
 417                 case SIGSEGV:
 418                         switch (info->si_code) {
 419                         case SEGV_MAPERR: sig_code = SUBSIG_NOMAPPING; break;
 420                         default: sig_code = SUBSIG_PROTECTION; break;
 421                         }
 422                         break;
 423                 case SIGILL:
 424                         switch (info->si_code) {
 425                         case ILL_ILLOPC: sig_code = SUBSIG_ILLINST; break;
 426                         case ILL_PRVOPC: sig_code = SUBSIG_PRIVINST; break;
 427                         case ILL_ILLTRP: sig_code = SUBSIG_BADTRAP(info->si_trapno); break;
 428                         default: sig_code = SUBSIG_STACK; break;
 429                         }
 430                         break;
 431                 case SIGFPE:
 432                         switch (info->si_code) {
 433                         case FPE_INTDIV: sig_code = SUBSIG_IDIVZERO; break;
 434                         case FPE_INTOVF: sig_code = SUBSIG_FPINTOVFL; break;
 435                         case FPE_FLTDIV: sig_code = SUBSIG_FPDIVZERO; break;
 436                         case FPE_FLTOVF: sig_code = SUBSIG_FPOVFLOW; break;
 437                         case FPE_FLTUND: sig_code = SUBSIG_FPUNFLOW; break;
 438                         case FPE_FLTRES: sig_code = SUBSIG_FPINEXACT; break;
 439                         case FPE_FLTINV: sig_code = SUBSIG_FPOPERROR; break;
 440                         default: sig_code = SUBSIG_FPERROR; break;
 441                         }
 442                         break;
 443                 case SIGBUS:
 444                         switch (info->si_code) {
 445                         case BUS_ADRALN: sig_code = SUBSIG_ALIGNMENT; break;
 446                         case BUS_ADRERR: sig_code = SUBSIG_MISCERROR; break;
 447                         default: sig_code = SUBSIG_BUSTIMEOUT; break;
 448                         }
 449                         break;
 450                 case SIGEMT:
 451                         switch (info->si_code) {
 452                         case EMT_TAGOVF: sig_code = SUBSIG_TAG; break;
 453                         }
 454                         break;
 455                 case SIGSYS:
 456                         if (info->si_code == (__SI_FAULT|0x100)) {
 457                                 /* See sys_sunos.c */
 458                                 sig_code = info->si_trapno;
 459                                 break;
 460                         }
 461                 default:
 462                         sig_address = NULL;
 463                 }
 464         }
 465         err |= __put_user((unsigned long)sig_address, &sframep->sig_address);
 466         err |= __put_user(sig_code, &sframep->sig_code);
 467         err |= __put_user(sc, &sframep->sig_scptr);
 468         if (err)
 469                 goto sigsegv;
 470
 471         regs->u_regs[UREG_FP] = (unsigned long) sframep;
 472         regs->pc = (unsigned long) sa->sa_handler;
 473         regs->npc = (regs->pc + 4);
 474         return;
 475
 476 sigill_and_return:
 477         do_exit(SIGILL);
 478 sigsegv:
 479         force_sigsegv(signr, current);
 480 }
 481
 482
 483 static inline int
 484 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 485 {
 486         int err = 0;
 487 #ifdef CONFIG_SMP
 488         if (test_tsk_thread_flag(current, TIF_USEDFPU)) {
 489                 put_psr(get_psr() | PSR_EF);
 490                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 491                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 492                 regs->psr &= ~(PSR_EF);
 493                 clear_tsk_thread_flag(current, TIF_USEDFPU);
 494         }
 495 #else
 496         if (current == last_task_used_math) {
 497                 put_psr(get_psr() | PSR_EF);
 498                 fpsave(&current->thread.float_regs[0], &current->thread.fsr,
 499                        &current->thread.fpqueue[0], &current->thread.fpqdepth);
 500                 last_task_used_math = NULL;
 501                 regs->psr &= ~(PSR_EF);
 502         }
 503 #endif
 504         err |= __copy_to_user(&fpu->si_float_regs[0],
 505                               &current->thread.float_regs[0],
 506                               (sizeof(unsigned long) * 32));
 507         err |= __put_user(current->thread.fsr, &fpu->si_fsr);
 508         err |= __put_user(current->thread.fpqdepth, &fpu->si_fpqdepth);
 509         if (current->thread.fpqdepth != 0)
 510                 err |= __copy_to_user(&fpu->si_fpqueue[0],
 511                                       &current->thread.fpqueue[0],
 512                                       ((sizeof(unsigned long) +
 513                                       (sizeof(unsigned long *)))*16));
 514         clear_used_math();
 515         return err;
 516 }
 517
 518 static inline void
 519 new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 520                 int signo, sigset_t *oldset)
 521 {
 522         struct new_signal_frame __user *sf;
 523         int sigframe_size, err;
 524
 525         /* 1. Make sure everything is clean */
 526         synchronize_user_stack();
 527
 528         sigframe_size = NF_ALIGNEDSZ;
 529         if (!used_math())
 530                 sigframe_size -= sizeof(__siginfo_fpu_t);
 531
 532         sf = (struct new_signal_frame __user *)
 533                 get_sigframe(&ka->sa, regs, sigframe_size);
 534
 535         if (invalid_frame_pointer(sf, sigframe_size))
 536                 goto sigill_and_return;
 537
 538         if (current_thread_info()->w_saved != 0)
 539                 goto sigill_and_return;
 540
 541         /* 2. Save the current process state */
 542         err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
 543
 544         err |= __put_user(0, &sf->extra_size);
 545
 546         if (used_math()) {
 547                 err |= save_fpu_state(regs, &sf->fpu_state);
 548                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 549         } else {
 550                 err |= __put_user(0, &sf->fpu_save);
 551         }
 552
 553         err |= __put_user(oldset->sig[0], &sf->info.si_mask);
 554         err |= __copy_to_user(sf->extramask, &oldset->sig[1],
 555                               (_NSIG_WORDS - 1) * sizeof(unsigned int));
 556         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 557                               sizeof(struct reg_window));
 558         if (err)
 559                 goto sigsegv;
 560
 561         /* 3. signal handler back-trampoline and parameters */
 562         regs->u_regs[UREG_FP] = (unsigned long) sf;
 563         regs->u_regs[UREG_I0] = signo;
 564         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 565         regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
 566
 567         /* 4. signal handler */
 568         regs->pc = (unsigned long) ka->sa.sa_handler;
 569         regs->npc = (regs->pc + 4);
 570
 571         /* 5. return to kernel instructions */
 572         if (ka->ka_restorer)
 573                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 574         else {
 575                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 576
 577                 /* mov __NR_sigreturn, %g1 */
 578                 err |= __put_user(0x821020d8, &sf->insns[0]);
 579
 580                 /* t 0x10 */
 581                 err |= __put_user(0x91d02010, &sf->insns[1]);
 582                 if (err)
 583                         goto sigsegv;
 584
 585                 /* Flush instruction space. */
 586                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 587         }
 588         return;
 589
 590 sigill_and_return:
 591         do_exit(SIGILL);
 592 sigsegv:
 593         force_sigsegv(signo, current);
 594 }
 595
 596 static inline void
 597 new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 598                    int signo, sigset_t *oldset, siginfo_t *info)
 599 {
 600         struct rt_signal_frame __user *sf;
 601         int sigframe_size;
 602         unsigned int psr;
 603         int err;
 604
 605         synchronize_user_stack();
 606         sigframe_size = RT_ALIGNEDSZ;
 607         if (!used_math())
 608                 sigframe_size -= sizeof(__siginfo_fpu_t);
 609         sf = (struct rt_signal_frame __user *)
 610                 get_sigframe(&ka->sa, regs, sigframe_size);
 611         if (invalid_frame_pointer(sf, sigframe_size))
 612                 goto sigill;
 613         if (current_thread_info()->w_saved != 0)
 614                 goto sigill;
 615
 616         err  = __put_user(regs->pc, &sf->regs.pc);
 617         err |= __put_user(regs->npc, &sf->regs.npc);
 618         err |= __put_user(regs->y, &sf->regs.y);
 619         psr = regs->psr;
 620         if (used_math())
 621                 psr |= PSR_EF;
 622         err |= __put_user(psr, &sf->regs.psr);
 623         err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
 624         err |= __put_user(0, &sf->extra_size);
 625
 626         if (psr & PSR_EF) {
 627                 err |= save_fpu_state(regs, &sf->fpu_state);
 628                 err |= __put_user(&sf->fpu_state, &sf->fpu_save);
 629         } else {
 630                 err |= __put_user(0, &sf->fpu_save);
 631         }
 632         err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
 633
 634         /* Setup sigaltstack */
 635         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 636         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 637         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 638
 639         err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
 640                               sizeof(struct reg_window));
 641
 642         err |= copy_siginfo_to_user(&sf->info, info);
 643
 644         if (err)
 645                 goto sigsegv;
 646
 647         regs->u_regs[UREG_FP] = (unsigned long) sf;
 648         regs->u_regs[UREG_I0] = signo;
 649         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 650         regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
 651
 652         regs->pc = (unsigned long) ka->sa.sa_handler;
 653         regs->npc = (regs->pc + 4);
 654
 655         if (ka->ka_restorer)
 656                 regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 657         else {
 658                 regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 659
 660                 /* mov __NR_sigreturn, %g1 */
 661                 err |= __put_user(0x821020d8, &sf->insns[0]);
 662
 663                 /* t 0x10 */
 664                 err |= __put_user(0x91d02010, &sf->insns[1]);
 665                 if (err)
 666                         goto sigsegv;
 667
 668                 /* Flush instruction space. */
 669                 flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
 670         }
 671         return;
 672
 673 sigill:
 674         do_exit(SIGILL);
 675 sigsegv:
 676         force_sigsegv(signo, current);
 677 }
 678
 679 /* Setup a Solaris stack frame */
 680 static inline void
 681 setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
 682                  struct pt_regs *regs, int signr, sigset_t *oldset)
 683 {
 684         svr4_signal_frame_t __user *sfp;
 685         svr4_gregset_t  __user *gr;
 686         svr4_siginfo_t  __user *si;
 687         svr4_mcontext_t __user *mc;
 688         svr4_gwindows_t __user *gw;
 689         svr4_ucontext_t __user *uc;
 690         svr4_sigset_t   setv;
 691         struct thread_info *tp = current_thread_info();
 692         int window = 0, err;
 693
 694         synchronize_user_stack();
 695         sfp = (svr4_signal_frame_t __user *)
 696                 get_sigframe(sa, regs, SVR4_SF_ALIGNED + sizeof(struct reg_window));
 697
 698         if (invalid_frame_pointer(sfp, sizeof(*sfp)))
 699                 goto sigill_and_return;
 700
 701         /* Start with a clean frame pointer and fill it */
 702         err = __clear_user(sfp, sizeof(*sfp));
 703
 704         /* Setup convenience variables */
 705         si = &sfp->si;
 706         uc = &sfp->uc;
 707         gw = &sfp->gw;
 708         mc = &uc->mcontext;
 709         gr = &mc->greg;
 710
 711         /* FIXME: where am I supposed to put this?
 712          * sc->sigc_onstack = old_status;
 713          * anyways, it does not look like it is used for anything at all.
 714          */
 715         setv.sigbits[0] = oldset->sig[0];
 716         setv.sigbits[1] = oldset->sig[1];
 717         if (_NSIG_WORDS >= 4) {
 718                 setv.sigbits[2] = oldset->sig[2];
 719                 setv.sigbits[3] = oldset->sig[3];
 720                 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
 721         } else
 722                 err |= __copy_to_user(&uc->sigmask, &setv,
 723                                       2 * sizeof(unsigned int));
 724
 725         /* Store registers */
 726         err |= __put_user(regs->pc, &((*gr)[SVR4_PC]));
 727         err |= __put_user(regs->npc, &((*gr)[SVR4_NPC]));
 728         err |= __put_user(regs->psr, &((*gr)[SVR4_PSR]));
 729         err |= __put_user(regs->y, &((*gr)[SVR4_Y]));
 730
 731         /* Copy g[1..7] and o[0..7] registers */
 732         err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
 733                               sizeof(long) * 7);
 734         err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
 735                               sizeof(long) * 8);
 736
 737         /* Setup sigaltstack */
 738         err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
 739         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
 740         err |= __put_user(current->sas_ss_size, &uc->stack.size);
 741
 742         /* Save the currently window file: */
 743
 744         /* 1. Link sfp->uc->gwins to our windows */
 745         err |= __put_user(gw, &mc->gwin);
 746
 747         /* 2. Number of windows to restore at setcontext(): */
 748         err |= __put_user(tp->w_saved, &gw->count);
 749
 750         /* 3. Save each valid window
 751          *    Currently, it makes a copy of the windows from the kernel copy.
 752          *    David's code for SunOS, makes the copy but keeps the pointer to
 753          *    the kernel.  My version makes the pointer point to a userland
 754          *    copy of those.  Mhm, I wonder if I shouldn't just ignore those
 755          *    on setcontext and use those that are on the kernel, the signal
 756          *    handler should not be modyfing those, mhm.
 757          *
 758          *    These windows are just used in case synchronize_user_stack failed
 759          *    to flush the user windows.
 760          */
 761         for (window = 0; window < tp->w_saved; window++) {
 762                 err |= __put_user((int __user *) &(gw->win[window]), &gw->winptr[window]);
 763                 err |= __copy_to_user(&gw->win[window],
 764                                       &tp->reg_window[window],
 765                                       sizeof(svr4_rwindow_t));
 766                 err |= __put_user(0, gw->winptr[window]);
 767         }
 768
 769         /* 4. We just pay attention to the gw->count field on setcontext */
 770         tp->w_saved = 0; /* So process is allowed to execute. */
 771
 772         /* Setup the signal information.  Solaris expects a bunch of
 773          * information to be passed to the signal handler, we don't provide
 774          * that much currently, should use siginfo.
 775          */
 776         err |= __put_user(signr, &si->siginfo.signo);
 777         err |= __put_user(SVR4_SINOINFO, &si->siginfo.code);
 778         if (err)
 779                 goto sigsegv;
 780
 781         regs->u_regs[UREG_FP] = (unsigned long) sfp;
 782         regs->pc = (unsigned long) sa->sa_handler;
 783         regs->npc = (regs->pc + 4);
 784
 785         /* Arguments passed to signal handler */
 786         if (regs->u_regs[14]){
 787                 struct reg_window __user *rw = (struct reg_window __user *)
 788                         regs->u_regs[14];
 789
 790                 err |= __put_user(signr, &rw->ins[0]);
 791                 err |= __put_user(si, &rw->ins[1]);
 792                 err |= __put_user(uc, &rw->ins[2]);
 793                 err |= __put_user(sfp, &rw->ins[6]);    /* frame pointer */
 794                 if (err)
 795                         goto sigsegv;
 796
 797                 regs->u_regs[UREG_I0] = signr;
 798                 regs->u_regs[UREG_I1] = (unsigned long) si;
 799                 regs->u_regs[UREG_I2] = (unsigned long) uc;
 800         }
 801         return;
 802
 803 sigill_and_return:
 804         do_exit(SIGILL);
 805 sigsegv:
 806         force_sigsegv(signr, current);
 807 }
 808
 809 asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
 810 {
 811         svr4_gregset_t  __user *gr;
 812         svr4_mcontext_t __user *mc;
 813         svr4_sigset_t   setv;
 814         int err = 0;
 815
 816         synchronize_user_stack();
 817
 818         if (current_thread_info()->w_saved)
 819                 return -EFAULT;
 820
 821         err = clear_user(uc, sizeof(*uc));
 822         if (err)
 823                 return -EFAULT;
 824
 825         /* Setup convenience variables */
 826         mc = &uc->mcontext;
 827         gr = &mc->greg;
 828
 829         setv.sigbits[0] = current->blocked.sig[0];
 830         setv.sigbits[1] = current->blocked.sig[1];
 831         if (_NSIG_WORDS >= 4) {
 832                 setv.sigbits[2] = current->blocked.sig[2];
 833                 setv.sigbits[3] = current->blocked.sig[3];
 834                 err |= __copy_to_user(&uc->sigmask, &setv, sizeof(svr4_sigset_t));
 835         } else
 836                 err |= __copy_to_user(&uc->sigmask, &setv,
 837                                       2 * sizeof(unsigned int));
 838
 839         /* Store registers */
 840         err |= __put_user(regs->pc, &uc->mcontext.greg[SVR4_PC]);
 841         err |= __put_user(regs->npc, &uc->mcontext.greg[SVR4_NPC]);
 842         err |= __put_user(regs->psr, &uc->mcontext.greg[SVR4_PSR]);
 843         err |= __put_user(regs->y, &uc->mcontext.greg[SVR4_Y]);
 844
 845         /* Copy g[1..7] and o[0..7] registers */
 846         err |= __copy_to_user(&(*gr)[SVR4_G1], &regs->u_regs[UREG_G1],
 847                               sizeof(uint) * 7);
 848         err |= __copy_to_user(&(*gr)[SVR4_O0], &regs->u_regs[UREG_I0],
 849                               sizeof(uint) * 8);
 850
 851         /* Setup sigaltstack */
 852         err |= __put_user(current->sas_ss_sp, &uc->stack.sp);
 853         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &uc->stack.flags);
 854         err |= __put_user(current->sas_ss_size, &uc->stack.size);
 855
 856         /* The register file is not saved
 857          * we have already stuffed all of it with sync_user_stack
 858          */
 859         return (err ? -EFAULT : 0);
 860 }
 861
 862 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
 863 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
 864 {
 865         svr4_gregset_t  __user *gr;
 866         unsigned long pc, npc, psr;
 867         mm_segment_t old_fs;
 868         sigset_t set;
 869         svr4_sigset_t setv;
 870         int err;
 871         stack_t st;
 872
 873         /* Fixme: restore windows, or is this already taken care of in
 874          * svr4_setup_frame when sync_user_windows is done?
 875          */
 876         flush_user_windows();
 877
 878         if (current_thread_info()->w_saved)
 879                 goto sigsegv_and_return;
 880
 881         if (((unsigned long) c) & 3)
 882                 goto sigsegv_and_return;
 883
 884         if (!__access_ok((unsigned long)c, sizeof(*c)))
 885                 goto sigsegv_and_return;
 886
 887         /* Check for valid PC and nPC */
 888         gr = &c->mcontext.greg;
 889         err = __get_user(pc, &((*gr)[SVR4_PC]));
 890         err |= __get_user(npc, &((*gr)[SVR4_NPC]));
 891
 892         if ((pc | npc) & 3)
 893                 goto sigsegv_and_return;
 894
 895         /* Retrieve information from passed ucontext */
 896         /* note that nPC is ored a 1, this is used to inform entry.S */
 897         /* that we don't want it to mess with our PC and nPC */
 898
 899         /* This is pretty much atomic, no amount locking would prevent
 900          * the races which exist anyways.
 901          */
 902         err |= __copy_from_user(&setv, &c->sigmask, sizeof(svr4_sigset_t));
 903
 904         err |= __get_user(st.ss_sp, &c->stack.sp);
 905         err |= __get_user(st.ss_flags, &c->stack.flags);
 906         err |= __get_user(st.ss_size, &c->stack.size);
 907
 908         if (err)
 909                 goto sigsegv_and_return;
 910
 911         /* It is more difficult to avoid calling this function than to
 912            call it and ignore errors.  */
 913         old_fs = get_fs();
 914         set_fs(KERNEL_DS);
 915         do_sigaltstack((const stack_t __user *) &st, NULL,
 916                        regs->u_regs[UREG_I6]);
 917         set_fs(old_fs);
 918
 919         set.sig[0] = setv.sigbits[0];
 920         set.sig[1] = setv.sigbits[1];
 921         if (_NSIG_WORDS >= 4) {
 922                 set.sig[2] = setv.sigbits[2];
 923                 set.sig[3] = setv.sigbits[3];
 924         }
 925         sigdelsetmask(&set, ~_BLOCKABLE);
 926         spin_lock_irq(&current->sighand->siglock);
 927         current->blocked = set;
 928         recalc_sigpending();
 929         spin_unlock_irq(&current->sighand->siglock);
 930         regs->pc = pc;
 931         regs->npc = npc | 1;
 932         err |= __get_user(regs->y, &((*gr)[SVR4_Y]));
 933         err |= __get_user(psr, &((*gr)[SVR4_PSR]));
 934         regs->psr &= ~(PSR_ICC);
 935         regs->psr |= (psr & PSR_ICC);
 936
 937         /* Restore g[1..7] and o[0..7] registers */
 938         err |= __copy_from_user(&regs->u_regs[UREG_G1], &(*gr)[SVR4_G1],
 939                               sizeof(long) * 7);
 940         err |= __copy_from_user(&regs->u_regs[UREG_I0], &(*gr)[SVR4_O0],
 941                               sizeof(long) * 8);
 942         return (err ? -EFAULT : 0);
 943
 944 sigsegv_and_return:
 945         force_sig(SIGSEGV, current);
 946         return -EFAULT;
 947 }
 948
 949 static inline void
 950 handle_signal(unsigned long signr, struct k_sigaction *ka,
 951               siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
 952               int svr4_signal)
 953 {
 954         if (svr4_signal)
 955                 setup_svr4_frame(&ka->sa, regs->pc, regs->npc, regs, signr, oldset);
 956         else {
 957                 if (ka->sa.sa_flags & SA_SIGINFO)
 958                         new_setup_rt_frame(ka, regs, signr, oldset, info);
 959                 else if (current->thread.new_signal)
 960                         new_setup_frame(ka, regs, signr, oldset);
 961                 else
 962                         setup_frame(&ka->sa, regs, signr, oldset, info);
 963         }
 964         spin_lock_irq(&current->sighand->siglock);
 965         sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 966         if (!(ka->sa.sa_flags & SA_NOMASK))
 967                 sigaddset(&current->blocked, signr);
 968         recalc_sigpending();
 969         spin_unlock_irq(&current->sighand->siglock);
 970 }
 971
 972 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 973                                    struct sigaction *sa)
 974 {
 975         switch(regs->u_regs[UREG_I0]) {
 976         case ERESTART_RESTARTBLOCK:
 977         case ERESTARTNOHAND:
 978         no_system_call_restart:
 979                 regs->u_regs[UREG_I0] = EINTR;
 980                 regs->psr |= PSR_C;
 981                 break;
 982         case ERESTARTSYS:
 983                 if (!(sa->sa_flags & SA_RESTART))
 984                         goto no_system_call_restart;
 985                 /* fallthrough */
 986         case ERESTARTNOINTR:
 987                 regs->u_regs[UREG_I0] = orig_i0;
 988                 regs->pc -= 4;
 989                 regs->npc -= 4;
 990         }
 991 }
 992
 993 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 994  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 995  * mistake.
 996  */
 997 asmlinkage void do_signal(struct pt_regs * regs, unsigned long orig_i0, int restart_syscall)
 998 {
 999         siginfo_t info;
1000         struct sparc_deliver_cookie cookie;
1001         struct k_sigaction ka;
1002         int signr;
1003         sigset_t *oldset;
1004
1005         /*
1006          * XXX Disable svr4 signal handling until solaris emulation works.
1007          * It is buggy - Anton
1008          */
1009 #define SVR4_SIGNAL_BROKEN 1
1010 #ifdef SVR4_SIGNAL_BROKEN
1011         int svr4_signal = 0;
1012 #else
1013         int svr4_signal = current->personality == PER_SVR4;
1014 #endif
1015
1016         cookie.restart_syscall = restart_syscall;
1017         cookie.orig_i0 = orig_i0;
1018
1019         if (test_thread_flag(TIF_RESTORE_SIGMASK))
1020                 oldset = &current->saved_sigmask;
1021         else
1022                 oldset = &current->blocked;
1023
1024         signr = get_signal_to_deliver(&info, &ka, regs, &cookie);
1025         if (signr > 0) {
1026                 if (cookie.restart_syscall)
1027                         syscall_restart(cookie.orig_i0, regs, &ka.sa);
1028                 handle_signal(signr, &ka, &info, oldset,
1029                               regs, svr4_signal);
1030                 /* a signal was successfully delivered; the saved
1031                  * sigmask will have been stored in the signal frame,
1032                  * and will be restored by sigreturn, so we can simply
1033                  * clear the TIF_RESTORE_SIGMASK flag.
1034                  */
1035                 if (test_thread_flag(TIF_RESTORE_SIGMASK))
1036                         clear_thread_flag(TIF_RESTORE_SIGMASK);
1037                 return;
1038         }
1039         if (cookie.restart_syscall &&
1040             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1041              regs->u_regs[UREG_I0] == ERESTARTSYS ||
1042              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1043                 /* replay the system call when we are done */
1044                 regs->u_regs[UREG_I0] = cookie.orig_i0;
1045                 regs->pc -= 4;
1046                 regs->npc -= 4;
1047         }
1048         if (cookie.restart_syscall &&
1049             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1050                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1051                 regs->pc -= 4;
1052                 regs->npc -= 4;
1053         }
1054
1055         /* if there's no signal to deliver, we just put the saved sigmask
1056          * back
1057          */
1058         if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
1059                 clear_thread_flag(TIF_RESTORE_SIGMASK);
1060                 sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
1061         }
1062 }
1063
1064 asmlinkage int
1065 do_sys_sigstack(struct sigstack __user *ssptr, struct sigstack __user *ossptr,
1066                 unsigned long sp)
1067 {
1068         int ret = -EFAULT;
1069
1070         /* First see if old state is wanted. */
1071         if (ossptr) {
1072                 if (put_user(current->sas_ss_sp + current->sas_ss_size,
1073                              &ossptr->the_stack) ||
1074                     __put_user(on_sig_stack(sp), &ossptr->cur_status))
1075                         goto out;
1076         }
1077
1078         /* Now see if we want to update the new state. */
1079         if (ssptr) {
1080                 char *ss_sp;
1081
1082                 if (get_user(ss_sp, &ssptr->the_stack))
1083                         goto out;
1084                 /* If the current stack was set with sigaltstack, don't
1085                    swap stacks while we are on it.  */
1086                 ret = -EPERM;
1087                 if (current->sas_ss_sp && on_sig_stack(sp))
1088                         goto out;
1089
1090                 /* Since we don't know the extent of the stack, and we don't
1091                    track onstack-ness, but rather calculate it, we must
1092                    presume a size.  Ho hum this interface is lossy.  */
1093                 current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
1094                 current->sas_ss_size = SIGSTKSZ;
1095         }
1096         ret = 0;
1097 out:
1098         return ret;
1099 }
1100
1101 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
1102 {
1103         struct sparc_deliver_cookie *cp = cookie;
1104
1105         if (cp->restart_syscall &&
1106             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
1107              regs->u_regs[UREG_I0] == ERESTARTSYS ||
1108              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
1109                 /* replay the system call when we are done */
1110                 regs->u_regs[UREG_I0] = cp->orig_i0;
1111                 regs->pc -= 4;
1112                 regs->npc -= 4;
1113                 cp->restart_syscall = 0;
1114         }
1115
1116         if (cp->restart_syscall &&
1117             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
1118                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
1119                 regs->pc -= 4;
1120                 regs->npc -= 4;
1121                 cp->restart_syscall = 0;
1122         }
1123 }