arch/sparc64/kernel/signal.c

   1 /*  $Id: signal.c,v 1.60 2002/02/09 19:49:31 davem Exp $
   2  *  arch/sparc64/kernel/signal.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
   7  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
   8  *  Copyright (C) 1997,1998 Jakub Jelinek   (jj@sunsite.mff.cuni.cz)
   9  */
  10
  11 #include <linux/config.h>
  12 #ifdef CONFIG_SPARC32_COMPAT
  13 #include <linux/compat.h>       /* for compat_old_sigset_t */
  14 #endif
  15 #include <linux/sched.h>
  16 #include <linux/kernel.h>
  17 #include <linux/signal.h>
  18 #include <linux/errno.h>
  19 #include <linux/wait.h>
  20 #include <linux/ptrace.h>
  21 #include <linux/unistd.h>
  22 #include <linux/mm.h>
  23 #include <linux/tty.h>
  24 #include <linux/smp_lock.h>
  25 #include <linux/binfmts.h>
  26
  27 #include <asm/uaccess.h>
  28 #include <asm/bitops.h>
  29 #include <asm/ptrace.h>
  30 #include <asm/svr4.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/fpumacro.h>
  33 #include <asm/uctx.h>
  34 #include <asm/siginfo.h>
  35 #include <asm/visasm.h>
  36
  37 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
  38
  39 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
  40                      unsigned long orig_o0, int ret_from_syscall);
  41
  42 /* {set, get}context() needed for 64-bit SparcLinux userland. */
  43 asmlinkage void sparc64_set_context(struct pt_regs *regs)
  44 {
  45         struct ucontext *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0];
  46         mc_gregset_t __user *grp;
  47         unsigned long pc, npc, tstate;
  48         unsigned long fp, i7;
  49         unsigned char fenab;
  50         int err;
  51
  52         flush_user_windows();
  53         if (get_thread_wsaved()                                 ||
  54             (((unsigned long)ucp) & (sizeof(unsigned long)-1))  ||
  55             (!__access_ok((unsigned long)ucp, sizeof(*ucp))))
  56                 goto do_sigsegv;
  57         grp  = &ucp->uc_mcontext.mc_gregs;
  58         err  = __get_user(pc, &((*grp)[MC_PC]));
  59         err |= __get_user(npc, &((*grp)[MC_NPC]));
  60         if (err || ((pc | npc) & 3))
  61                 goto do_sigsegv;
  62         if (regs->u_regs[UREG_I1]) {
  63                 sigset_t set;
  64
  65                 if (_NSIG_WORDS == 1) {
  66                         if (__get_user(set.sig[0], &ucp->uc_sigmask.sig[0]))
  67                                 goto do_sigsegv;
  68                 } else {
  69                         if (__copy_from_user(&set, &ucp->uc_sigmask, sizeof(sigset_t)))
  70                                 goto do_sigsegv;
  71                 }
  72                 sigdelsetmask(&set, ~_BLOCKABLE);
  73                 spin_lock_irq(&current->sighand->siglock);
  74                 current->blocked = set;
  75                 recalc_sigpending();
  76                 spin_unlock_irq(&current->sighand->siglock);
  77         }
  78         if (test_thread_flag(TIF_32BIT)) {
  79                 pc &= 0xffffffff;
  80                 npc &= 0xffffffff;
  81         }
  82         regs->tpc = pc;
  83         regs->tnpc = npc;
  84         err |= __get_user(regs->y, &((*grp)[MC_Y]));
  85         err |= __get_user(tstate, &((*grp)[MC_TSTATE]));
  86         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
  87         regs->tstate |= (tstate & (TSTATE_ICC | TSTATE_XCC));
  88         err |= __get_user(regs->u_regs[UREG_G1], (&(*grp)[MC_G1]));
  89         err |= __get_user(regs->u_regs[UREG_G2], (&(*grp)[MC_G2]));
  90         err |= __get_user(regs->u_regs[UREG_G3], (&(*grp)[MC_G3]));
  91         err |= __get_user(regs->u_regs[UREG_G4], (&(*grp)[MC_G4]));
  92         err |= __get_user(regs->u_regs[UREG_G5], (&(*grp)[MC_G5]));
  93         err |= __get_user(regs->u_regs[UREG_G6], (&(*grp)[MC_G6]));
  94         err |= __get_user(regs->u_regs[UREG_G7], (&(*grp)[MC_G7]));
  95         err |= __get_user(regs->u_regs[UREG_I0], (&(*grp)[MC_O0]));
  96         err |= __get_user(regs->u_regs[UREG_I1], (&(*grp)[MC_O1]));
  97         err |= __get_user(regs->u_regs[UREG_I2], (&(*grp)[MC_O2]));
  98         err |= __get_user(regs->u_regs[UREG_I3], (&(*grp)[MC_O3]));
  99         err |= __get_user(regs->u_regs[UREG_I4], (&(*grp)[MC_O4]));
 100         err |= __get_user(regs->u_regs[UREG_I5], (&(*grp)[MC_O5]));
 101         err |= __get_user(regs->u_regs[UREG_I6], (&(*grp)[MC_O6]));
 102         err |= __get_user(regs->u_regs[UREG_I7], (&(*grp)[MC_O7]));
 103
 104         err |= __get_user(fp, &(ucp->uc_mcontext.mc_fp));
 105         err |= __get_user(i7, &(ucp->uc_mcontext.mc_i7));
 106         err |= __put_user(fp,
 107               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 108         err |= __put_user(i7,
 109               (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 110
 111         err |= __get_user(fenab, &(ucp->uc_mcontext.mc_fpregs.mcfpu_enab));
 112         if (fenab) {
 113                 unsigned long *fpregs = current_thread_info()->fpregs;
 114                 unsigned long fprs;
 115
 116                 fprs_write(0);
 117                 err |= __get_user(fprs, &(ucp->uc_mcontext.mc_fpregs.mcfpu_fprs));
 118                 if (fprs & FPRS_DL)
 119                         err |= copy_from_user(fpregs,
 120                                               &(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs),
 121                                               (sizeof(unsigned int) * 32));
 122                 if (fprs & FPRS_DU)
 123                         err |= copy_from_user(fpregs+16,
 124                          ((unsigned long __user *)&(ucp->uc_mcontext.mc_fpregs.mcfpu_fregs))+16,
 125                          (sizeof(unsigned int) * 32));
 126                 err |= __get_user(current_thread_info()->xfsr[0],
 127                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_fsr));
 128                 err |= __get_user(current_thread_info()->gsr[0],
 129                                   &(ucp->uc_mcontext.mc_fpregs.mcfpu_gsr));
 130                 regs->tstate &= ~TSTATE_PEF;
 131         }
 132         if (err)
 133                 goto do_sigsegv;
 134
 135         return;
 136 do_sigsegv:
 137         do_exit(SIGSEGV);
 138 }
 139
 140 asmlinkage void sparc64_get_context(struct pt_regs *regs)
 141 {
 142         struct ucontext *ucp = (struct ucontext __user *) regs->u_regs[UREG_I0];
 143         mc_gregset_t __user *grp;
 144         mcontext_t __user *mcp;
 145         unsigned long fp, i7;
 146         unsigned char fenab;
 147         int err;
 148
 149         synchronize_user_stack();
 150         if (get_thread_wsaved() || clear_user(ucp, sizeof(*ucp)))
 151                 goto do_sigsegv;
 152
 153 #if 1
 154         fenab = 0; /* IMO get_context is like any other system call, thus modifies FPU state -jj */
 155 #else
 156         fenab = (current_thread_info()->fpsaved[0] & FPRS_FEF);
 157 #endif
 158
 159         mcp = &ucp->uc_mcontext;
 160         grp = &mcp->mc_gregs;
 161
 162         /* Skip over the trap instruction, first. */
 163         if (test_thread_flag(TIF_32BIT)) {
 164                 regs->tpc   = (regs->tnpc & 0xffffffff);
 165                 regs->tnpc  = (regs->tnpc + 4) & 0xffffffff;
 166         } else {
 167                 regs->tpc   = regs->tnpc;
 168                 regs->tnpc += 4;
 169         }
 170         err = 0;
 171         if (_NSIG_WORDS == 1)
 172                 err |= __put_user(current->blocked.sig[0],
 173                                   (unsigned long __user *)&ucp->uc_sigmask);
 174         else
 175                 err |= __copy_to_user(&ucp->uc_sigmask, &current->blocked,
 176                                       sizeof(sigset_t));
 177
 178         err |= __put_user(regs->tstate, &((*grp)[MC_TSTATE]));
 179         err |= __put_user(regs->tpc, &((*grp)[MC_PC]));
 180         err |= __put_user(regs->tnpc, &((*grp)[MC_NPC]));
 181         err |= __put_user(regs->y, &((*grp)[MC_Y]));
 182         err |= __put_user(regs->u_regs[UREG_G1], &((*grp)[MC_G1]));
 183         err |= __put_user(regs->u_regs[UREG_G2], &((*grp)[MC_G2]));
 184         err |= __put_user(regs->u_regs[UREG_G3], &((*grp)[MC_G3]));
 185         err |= __put_user(regs->u_regs[UREG_G4], &((*grp)[MC_G4]));
 186         err |= __put_user(regs->u_regs[UREG_G5], &((*grp)[MC_G5]));
 187         err |= __put_user(regs->u_regs[UREG_G6], &((*grp)[MC_G6]));
 188         err |= __put_user(regs->u_regs[UREG_G7], &((*grp)[MC_G7]));
 189         err |= __put_user(regs->u_regs[UREG_I0], &((*grp)[MC_O0]));
 190         err |= __put_user(regs->u_regs[UREG_I1], &((*grp)[MC_O1]));
 191         err |= __put_user(regs->u_regs[UREG_I2], &((*grp)[MC_O2]));
 192         err |= __put_user(regs->u_regs[UREG_I3], &((*grp)[MC_O3]));
 193         err |= __put_user(regs->u_regs[UREG_I4], &((*grp)[MC_O4]));
 194         err |= __put_user(regs->u_regs[UREG_I5], &((*grp)[MC_O5]));
 195         err |= __put_user(regs->u_regs[UREG_I6], &((*grp)[MC_O6]));
 196         err |= __put_user(regs->u_regs[UREG_I7], &((*grp)[MC_O7]));
 197
 198         err |= __get_user(fp,
 199                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[6])));
 200         err |= __get_user(i7,
 201                  (&(((struct reg_window __user *)(STACK_BIAS+regs->u_regs[UREG_I6]))->ins[7])));
 202         err |= __put_user(fp, &(mcp->mc_fp));
 203         err |= __put_user(i7, &(mcp->mc_i7));
 204
 205         err |= __put_user(fenab, &(mcp->mc_fpregs.mcfpu_enab));
 206         if (fenab) {
 207                 unsigned long *fpregs = current_thread_info()->fpregs;
 208                 unsigned long fprs;
 209
 210                 fprs = current_thread_info()->fpsaved[0];
 211                 if (fprs & FPRS_DL)
 212                         err |= copy_to_user(&(mcp->mc_fpregs.mcfpu_fregs), fpregs,
 213                                             (sizeof(unsigned int) * 32));
 214                 if (fprs & FPRS_DU)
 215                         err |= copy_to_user(
 216                           ((unsigned long __user *)&(mcp->mc_fpregs.mcfpu_fregs))+16, fpregs+16,
 217                           (sizeof(unsigned int) * 32));
 218                 err |= __put_user(current_thread_info()->xfsr[0], &(mcp->mc_fpregs.mcfpu_fsr));
 219                 err |= __put_user(current_thread_info()->gsr[0], &(mcp->mc_fpregs.mcfpu_gsr));
 220                 err |= __put_user(fprs, &(mcp->mc_fpregs.mcfpu_fprs));
 221         }
 222         if (err)
 223                 goto do_sigsegv;
 224
 225         return;
 226 do_sigsegv:
 227         do_exit(SIGSEGV);
 228 }
 229
 230 struct rt_signal_frame {
 231         struct sparc_stackf     ss;
 232         siginfo_t               info;
 233         struct pt_regs          regs;
 234         __siginfo_fpu_t __user  *fpu_save;
 235         stack_t                 stack;
 236         sigset_t                mask;
 237         __siginfo_fpu_t         fpu_state;
 238 };
 239
 240 /* Align macros */
 241 #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
 242
 243 /*
 244  * atomically swap in the new signal mask, and wait for a signal.
 245  * This is really tricky on the Sparc, watch out...
 246  */
 247 asmlinkage void _sigpause_common(old_sigset_t set, struct pt_regs *regs)
 248 {
 249         sigset_t saveset;
 250
 251 #ifdef CONFIG_SPARC32_COMPAT
 252         if (test_thread_flag(TIF_32BIT)) {
 253                 extern asmlinkage void _sigpause32_common(compat_old_sigset_t,
 254                                                           struct pt_regs *);
 255                 _sigpause32_common(set, regs);
 256                 return;
 257         }
 258 #endif
 259         set &= _BLOCKABLE;
 260         spin_lock_irq(&current->sighand->siglock);
 261         saveset = current->blocked;
 262         siginitset(&current->blocked, set);
 263         recalc_sigpending();
 264         spin_unlock_irq(&current->sighand->siglock);
 265
 266         if (test_thread_flag(TIF_32BIT)) {
 267                 regs->tpc = (regs->tnpc & 0xffffffff);
 268                 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
 269         } else {
 270                 regs->tpc = regs->tnpc;
 271                 regs->tnpc += 4;
 272         }
 273
 274         /* Condition codes and return value where set here for sigpause,
 275          * and so got used by setup_frame, which again causes sigreturn()
 276          * to return -EINTR.
 277          */
 278         while (1) {
 279                 current->state = TASK_INTERRUPTIBLE;
 280                 schedule();
 281                 /*
 282                  * Return -EINTR and set condition code here,
 283                  * so the interrupted system call actually returns
 284                  * these.
 285                  */
 286                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 287                 regs->u_regs[UREG_I0] = EINTR;
 288                 if (do_signal(&saveset, regs, 0, 0))
 289                         return;
 290         }
 291 }
 292
 293 asmlinkage void do_sigpause(unsigned int set, struct pt_regs *regs)
 294 {
 295         _sigpause_common(set, regs);
 296 }
 297
 298 asmlinkage void do_sigsuspend(struct pt_regs *regs)
 299 {
 300         _sigpause_common(regs->u_regs[UREG_I0], regs);
 301 }
 302
 303 asmlinkage void do_rt_sigsuspend(sigset_t __user *uset, size_t sigsetsize, struct pt_regs *regs)
 304 {
 305         sigset_t oldset, set;
 306
 307         /* XXX: Don't preclude handling different sized sigset_t's.  */
 308         if (sigsetsize != sizeof(sigset_t)) {
 309                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 310                 regs->u_regs[UREG_I0] = EINVAL;
 311                 return;
 312         }
 313         if (copy_from_user(&set, uset, sizeof(set))) {
 314                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 315                 regs->u_regs[UREG_I0] = EFAULT;
 316                 return;
 317         }
 318
 319         sigdelsetmask(&set, ~_BLOCKABLE);
 320         spin_lock_irq(&current->sighand->siglock);
 321         oldset = current->blocked;
 322         current->blocked = set;
 323         recalc_sigpending();
 324         spin_unlock_irq(&current->sighand->siglock);
 325
 326         if (test_thread_flag(TIF_32BIT)) {
 327                 regs->tpc = (regs->tnpc & 0xffffffff);
 328                 regs->tnpc = (regs->tnpc + 4) & 0xffffffff;
 329         } else {
 330                 regs->tpc = regs->tnpc;
 331                 regs->tnpc += 4;
 332         }
 333
 334         /* Condition codes and return value where set here for sigpause,
 335          * and so got used by setup_frame, which again causes sigreturn()
 336          * to return -EINTR.
 337          */
 338         while (1) {
 339                 current->state = TASK_INTERRUPTIBLE;
 340                 schedule();
 341                 /*
 342                  * Return -EINTR and set condition code here,
 343                  * so the interrupted system call actually returns
 344                  * these.
 345                  */
 346                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 347                 regs->u_regs[UREG_I0] = EINTR;
 348                 if (do_signal(&oldset, regs, 0, 0))
 349                         return;
 350         }
 351 }
 352
 353 static inline int
 354 restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 355 {
 356         unsigned long *fpregs = current_thread_info()->fpregs;
 357         unsigned long fprs;
 358         int err;
 359
 360         err = __get_user(fprs, &fpu->si_fprs);
 361         fprs_write(0);
 362         regs->tstate &= ~TSTATE_PEF;
 363         if (fprs & FPRS_DL)
 364                 err |= copy_from_user(fpregs, &fpu->si_float_regs[0],
 365                                (sizeof(unsigned int) * 32));
 366         if (fprs & FPRS_DU)
 367                 err |= copy_from_user(fpregs+16, &fpu->si_float_regs[32],
 368                                (sizeof(unsigned int) * 32));
 369         err |= __get_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 370         err |= __get_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 371         current_thread_info()->fpsaved[0] |= fprs;
 372         return err;
 373 }
 374
 375 void do_rt_sigreturn(struct pt_regs *regs)
 376 {
 377         struct rt_signal_frame __user *sf;
 378         unsigned long tpc, tnpc, tstate;
 379         __siginfo_fpu_t __user *fpu_save;
 380         mm_segment_t old_fs;
 381         sigset_t set;
 382         stack_t st;
 383         int err;
 384
 385         /* Always make any pending restarted system calls return -EINTR */
 386         current_thread_info()->restart_block.fn = do_no_restart_syscall;
 387
 388         synchronize_user_stack ();
 389         sf = (struct rt_signal_frame __user *)
 390                 (regs->u_regs [UREG_FP] + STACK_BIAS);
 391
 392         /* 1. Make sure we are not getting garbage from the user */
 393         if (((unsigned long) sf) & 3)
 394                 goto segv;
 395
 396         err = get_user(tpc, &sf->regs.tpc);
 397         err |= __get_user(tnpc, &sf->regs.tnpc);
 398         if (test_thread_flag(TIF_32BIT)) {
 399                 tpc &= 0xffffffff;
 400                 tnpc &= 0xffffffff;
 401         }
 402         err |= ((tpc | tnpc) & 3);
 403
 404         /* 2. Restore the state */
 405         err |= __get_user(regs->y, &sf->regs.y);
 406         err |= __get_user(tstate, &sf->regs.tstate);
 407         err |= copy_from_user(regs->u_regs, sf->regs.u_regs, sizeof(regs->u_regs));
 408
 409         /* User can only change condition codes in %tstate. */
 410         regs->tstate &= ~(TSTATE_ICC | TSTATE_XCC);
 411         regs->tstate |= (tstate & (TSTATE_ICC | TSTATE_XCC));
 412
 413         err |= __get_user(fpu_save, &sf->fpu_save);
 414         if (fpu_save)
 415                 err |= restore_fpu_state(regs, &sf->fpu_state);
 416
 417         err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
 418         err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
 419
 420         if (err)
 421                 goto segv;
 422
 423         regs->tpc = tpc;
 424         regs->tnpc = tnpc;
 425
 426         /* It is more difficult to avoid calling this function than to
 427            call it and ignore errors.  */
 428         old_fs = get_fs();
 429         set_fs(KERNEL_DS);
 430         do_sigaltstack(&st, NULL, (unsigned long)sf);
 431         set_fs(old_fs);
 432
 433         sigdelsetmask(&set, ~_BLOCKABLE);
 434         spin_lock_irq(&current->sighand->siglock);
 435         current->blocked = set;
 436         recalc_sigpending();
 437         spin_unlock_irq(&current->sighand->siglock);
 438         return;
 439 segv:
 440         send_sig(SIGSEGV, current, 1);
 441 }
 442
 443 /* Checks if the fp is valid */
 444 static int invalid_frame_pointer(void __user *fp, int fplen)
 445 {
 446         if (((unsigned long) fp) & 7)
 447                 return 1;
 448         return 0;
 449 }
 450
 451 static inline int
 452 save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
 453 {
 454         unsigned long *fpregs = (unsigned long *)(regs+1);
 455         unsigned long fprs;
 456         int err = 0;
 457
 458         fprs = current_thread_info()->fpsaved[0];
 459         if (fprs & FPRS_DL)
 460                 err |= copy_to_user(&fpu->si_float_regs[0], fpregs,
 461                                     (sizeof(unsigned int) * 32));
 462         if (fprs & FPRS_DU)
 463                 err |= copy_to_user(&fpu->si_float_regs[32], fpregs+16,
 464                                     (sizeof(unsigned int) * 32));
 465         err |= __put_user(current_thread_info()->xfsr[0], &fpu->si_fsr);
 466         err |= __put_user(current_thread_info()->gsr[0], &fpu->si_gsr);
 467         err |= __put_user(fprs, &fpu->si_fprs);
 468
 469         return err;
 470 }
 471
 472 static inline void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, unsigned long framesize)
 473 {
 474         unsigned long sp;
 475
 476         sp = regs->u_regs[UREG_FP] + STACK_BIAS;
 477
 478         /* This is the X/Open sanctioned signal stack switching.  */
 479         if (ka->sa.sa_flags & SA_ONSTACK) {
 480                 if (!on_sig_stack(sp) &&
 481                     !((current->sas_ss_sp + current->sas_ss_size) & 7))
 482                         sp = current->sas_ss_sp + current->sas_ss_size;
 483         }
 484         return (void __user *)(sp - framesize);
 485 }
 486
 487 static inline void
 488 setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 489                int signo, sigset_t *oldset, siginfo_t *info)
 490 {
 491         struct rt_signal_frame __user *sf;
 492         int sigframe_size, err;
 493
 494         /* 1. Make sure everything is clean */
 495         synchronize_user_stack();
 496         save_and_clear_fpu();
 497
 498         sigframe_size = RT_ALIGNEDSZ;
 499         if (!(current_thread_info()->fpsaved[0] & FPRS_FEF))
 500                 sigframe_size -= sizeof(__siginfo_fpu_t);
 501
 502         sf = (struct rt_signal_frame __user *)
 503                 get_sigframe(ka, regs, sigframe_size);
 504
 505         if (invalid_frame_pointer (sf, sigframe_size))
 506                 goto sigill;
 507
 508         if (get_thread_wsaved() != 0)
 509                 goto sigill;
 510
 511         /* 2. Save the current process state */
 512         err = copy_to_user(&sf->regs, regs, sizeof (*regs));
 513
 514         if (current_thread_info()->fpsaved[0] & FPRS_FEF) {
 515                 err |= save_fpu_state(regs, &sf->fpu_state);
 516                 err |= __put_user((u64)&sf->fpu_state, &sf->fpu_save);
 517         } else {
 518                 err |= __put_user(0, &sf->fpu_save);
 519         }
 520
 521         /* Setup sigaltstack */
 522         err |= __put_user(current->sas_ss_sp, &sf->stack.ss_sp);
 523         err |= __put_user(sas_ss_flags(regs->u_regs[UREG_FP]), &sf->stack.ss_flags);
 524         err |= __put_user(current->sas_ss_size, &sf->stack.ss_size);
 525
 526         err |= copy_to_user(&sf->mask, oldset, sizeof(sigset_t));
 527
 528         err |= copy_in_user((u64 __user *)sf,
 529                             (u64 __user *)(regs->u_regs[UREG_FP]+STACK_BIAS),
 530                             sizeof(struct reg_window));
 531
 532         if (info)
 533                 err |= copy_siginfo_to_user(&sf->info, info);
 534         else {
 535                 err |= __put_user(signo, &sf->info.si_signo);
 536                 err |= __put_user(SI_NOINFO, &sf->info.si_code);
 537         }
 538         if (err)
 539                 goto sigsegv;
 540
 541         /* 3. signal handler back-trampoline and parameters */
 542         regs->u_regs[UREG_FP] = ((unsigned long) sf) - STACK_BIAS;
 543         regs->u_regs[UREG_I0] = signo;
 544         regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
 545
 546         /* 5. signal handler */
 547         regs->tpc = (unsigned long) ka->sa.sa_handler;
 548         regs->tnpc = (regs->tpc + 4);
 549         if (test_thread_flag(TIF_32BIT)) {
 550                 regs->tpc &= 0xffffffff;
 551                 regs->tnpc &= 0xffffffff;
 552         }
 553         /* 4. return to kernel instructions */
 554         regs->u_regs[UREG_I7] = (unsigned long)ka->ka_restorer;
 555         return;
 556
 557 sigill:
 558         do_exit(SIGILL);
 559 sigsegv:
 560         do_exit(SIGSEGV);
 561 }
 562
 563 static inline void handle_signal(unsigned long signr, struct k_sigaction *ka,
 564                                  siginfo_t *info,
 565                                  sigset_t *oldset, struct pt_regs *regs)
 566 {
 567         setup_rt_frame(ka, regs, signr, oldset,
 568                        (ka->sa.sa_flags & SA_SIGINFO) ? info : NULL);
 569         if (ka->sa.sa_flags & SA_ONESHOT)
 570                 ka->sa.sa_handler = SIG_DFL;
 571         if (!(ka->sa.sa_flags & SA_NOMASK)) {
 572                 spin_lock_irq(&current->sighand->siglock);
 573                 sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
 574                 sigaddset(&current->blocked,signr);
 575                 recalc_sigpending();
 576                 spin_unlock_irq(&current->sighand->siglock);
 577         }
 578 }
 579
 580 static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
 581                                      struct sigaction *sa)
 582 {
 583         switch (regs->u_regs[UREG_I0]) {
 584         case ERESTART_RESTARTBLOCK:
 585         case ERESTARTNOHAND:
 586         no_system_call_restart:
 587                 regs->u_regs[UREG_I0] = EINTR;
 588                 regs->tstate |= (TSTATE_ICARRY|TSTATE_XCARRY);
 589                 break;
 590         case ERESTARTSYS:
 591                 if (!(sa->sa_flags & SA_RESTART))
 592                         goto no_system_call_restart;
 593                 /* fallthrough */
 594         case ERESTARTNOINTR:
 595                 regs->u_regs[UREG_I0] = orig_i0;
 596                 regs->tpc -= 4;
 597                 regs->tnpc -= 4;
 598         }
 599 }
 600
 601 /* Note that 'init' is a special process: it doesn't get signals it doesn't
 602  * want to handle. Thus you cannot kill init even with a SIGKILL even by
 603  * mistake.
 604  */
 605 static int do_signal(sigset_t *oldset, struct pt_regs * regs,
 606                      unsigned long orig_i0, int restart_syscall)
 607 {
 608         siginfo_t info;
 609         struct signal_deliver_cookie cookie;
 610         int signr;
 611
 612         cookie.restart_syscall = restart_syscall;
 613         cookie.orig_i0 = orig_i0;
 614
 615         if (!oldset)
 616                 oldset = &current->blocked;
 617
 618 #ifdef CONFIG_SPARC32_COMPAT
 619         if (test_thread_flag(TIF_32BIT)) {
 620                 extern int do_signal32(sigset_t *, struct pt_regs *,
 621                                        unsigned long, int);
 622                 return do_signal32(oldset, regs, orig_i0,
 623                                    cookie.restart_syscall);
 624         }
 625 #endif
 626
 627         signr = get_signal_to_deliver(&info, regs, &cookie);
 628         if (signr > 0) {
 629                 struct k_sigaction *ka;
 630
 631                 ka = &current->sighand->action[signr-1];
 632
 633                 if (cookie.restart_syscall)
 634                         syscall_restart(orig_i0, regs, &ka->sa);
 635                 handle_signal(signr, ka, &info, oldset, regs);
 636                 return 1;
 637         }
 638         if (cookie.restart_syscall &&
 639             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 640              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 641              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 642                 /* replay the system call when we are done */
 643                 regs->u_regs[UREG_I0] = cookie.orig_i0;
 644                 regs->tpc -= 4;
 645                 regs->tnpc -= 4;
 646         }
 647         if (cookie.restart_syscall &&
 648             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 649                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 650                 regs->tpc -= 4;
 651                 regs->tnpc -= 4;
 652         }
 653         return 0;
 654 }
 655
 656 void do_notify_resume(sigset_t *oldset, struct pt_regs *regs,
 657                       unsigned long orig_i0, int restart_syscall,
 658                       unsigned long thread_info_flags)
 659 {
 660         if (thread_info_flags & _TIF_SIGPENDING)
 661                 do_signal(oldset, regs, orig_i0, restart_syscall);
 662 }
 663
 664 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
 665 {
 666         struct signal_deliver_cookie *cp = cookie;
 667
 668         if (cp->restart_syscall &&
 669             (regs->u_regs[UREG_I0] == ERESTARTNOHAND ||
 670              regs->u_regs[UREG_I0] == ERESTARTSYS ||
 671              regs->u_regs[UREG_I0] == ERESTARTNOINTR)) {
 672                 /* replay the system call when we are done */
 673                 regs->u_regs[UREG_I0] = cp->orig_i0;
 674                 regs->tpc -= 4;
 675                 regs->tnpc -= 4;
 676                 cp->restart_syscall = 0;
 677         }
 678         if (cp->restart_syscall &&
 679             regs->u_regs[UREG_I0] == ERESTART_RESTARTBLOCK) {
 680                 regs->u_regs[UREG_G1] = __NR_restart_syscall;
 681                 regs->tpc -= 4;
 682                 regs->tnpc -= 4;
 683                 cp->restart_syscall = 0;
 684         }
 685 }