Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m68knommu/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file COPYING in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * Linux/m68k support by Hamish Macdonald |
| 13 | * |
| 14 | * 68060 fixes by Jesper Skov |
| 15 | * |
| 16 | * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab |
| 17 | * |
| 18 | * mathemu support by Roman Zippel |
| 19 | * (Note: fpstate in the signal context is completely ignored for the emulator |
| 20 | * and the internal floating point format is put on stack) |
| 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * ++roman (07/09/96): implemented signal stacks (specially for tosemu on |
| 25 | * Atari :-) Current limitation: Only one sigstack can be active at one time. |
| 26 | * If a second signal with SA_ONSTACK set arrives while working on a sigstack, |
| 27 | * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested |
| 28 | * signal handlers! |
| 29 | */ |
| 30 | |
| 31 | #include <linux/sched.h> |
| 32 | #include <linux/mm.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/signal.h> |
| 35 | #include <linux/syscalls.h> |
| 36 | #include <linux/errno.h> |
| 37 | #include <linux/wait.h> |
| 38 | #include <linux/ptrace.h> |
| 39 | #include <linux/unistd.h> |
| 40 | #include <linux/stddef.h> |
| 41 | #include <linux/highuid.h> |
| 42 | #include <linux/tty.h> |
| 43 | #include <linux/personality.h> |
| 44 | #include <linux/binfmts.h> |
| 45 | |
| 46 | #include <asm/setup.h> |
| 47 | #include <asm/uaccess.h> |
| 48 | #include <asm/pgtable.h> |
| 49 | #include <asm/traps.h> |
| 50 | #include <asm/ucontext.h> |
| 51 | |
| 52 | #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) |
| 53 | |
| 54 | asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs); |
| 55 | |
| 56 | /* |
| 57 | * Atomically swap in the new signal mask, and wait for a signal. |
| 58 | */ |
| 59 | asmlinkage int do_sigsuspend(struct pt_regs *regs) |
| 60 | { |
| 61 | old_sigset_t mask = regs->d3; |
| 62 | sigset_t saveset; |
| 63 | |
| 64 | mask &= _BLOCKABLE; |
| 65 | spin_lock_irq(¤t->sighand->siglock); |
| 66 | saveset = current->blocked; |
| 67 | siginitset(¤t->blocked, mask); |
| 68 | recalc_sigpending(); |
| 69 | spin_unlock_irq(¤t->sighand->siglock); |
| 70 | |
| 71 | regs->d0 = -EINTR; |
| 72 | while (1) { |
| 73 | current->state = TASK_INTERRUPTIBLE; |
| 74 | schedule(); |
| 75 | if (do_signal(&saveset, regs)) |
| 76 | return -EINTR; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | asmlinkage int |
| 81 | do_rt_sigsuspend(struct pt_regs *regs) |
| 82 | { |
| 83 | sigset_t *unewset = (sigset_t *)regs->d1; |
| 84 | size_t sigsetsize = (size_t)regs->d2; |
| 85 | sigset_t saveset, newset; |
| 86 | |
| 87 | /* XXX: Don't preclude handling different sized sigset_t's. */ |
| 88 | if (sigsetsize != sizeof(sigset_t)) |
| 89 | return -EINVAL; |
| 90 | |
| 91 | if (copy_from_user(&newset, unewset, sizeof(newset))) |
| 92 | return -EFAULT; |
| 93 | sigdelsetmask(&newset, ~_BLOCKABLE); |
| 94 | |
| 95 | spin_lock_irq(¤t->sighand->siglock); |
| 96 | saveset = current->blocked; |
| 97 | current->blocked = newset; |
| 98 | recalc_sigpending(); |
| 99 | spin_unlock_irq(¤t->sighand->siglock); |
| 100 | |
| 101 | regs->d0 = -EINTR; |
| 102 | while (1) { |
| 103 | current->state = TASK_INTERRUPTIBLE; |
| 104 | schedule(); |
| 105 | if (do_signal(&saveset, regs)) |
| 106 | return -EINTR; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | asmlinkage int |
| 111 | sys_sigaction(int sig, const struct old_sigaction *act, |
| 112 | struct old_sigaction *oact) |
| 113 | { |
| 114 | struct k_sigaction new_ka, old_ka; |
| 115 | int ret; |
| 116 | |
| 117 | if (act) { |
| 118 | old_sigset_t mask; |
| 119 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 120 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 121 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) |
| 122 | return -EFAULT; |
| 123 | __get_user(new_ka.sa.sa_flags, &act->sa_flags); |
| 124 | __get_user(mask, &act->sa_mask); |
| 125 | siginitset(&new_ka.sa.sa_mask, mask); |
| 126 | } |
| 127 | |
| 128 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 129 | |
| 130 | if (!ret && oact) { |
| 131 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 132 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 133 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) |
| 134 | return -EFAULT; |
| 135 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 136 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); |
| 137 | } |
| 138 | |
| 139 | return ret; |
| 140 | } |
| 141 | |
| 142 | asmlinkage int |
| 143 | sys_sigaltstack(const stack_t *uss, stack_t *uoss) |
| 144 | { |
| 145 | return do_sigaltstack(uss, uoss, rdusp()); |
| 146 | } |
| 147 | |
| 148 | |
| 149 | /* |
| 150 | * Do a signal return; undo the signal stack. |
| 151 | * |
| 152 | * Keep the return code on the stack quadword aligned! |
| 153 | * That makes the cache flush below easier. |
| 154 | */ |
| 155 | |
| 156 | struct sigframe |
| 157 | { |
| 158 | char *pretcode; |
| 159 | int sig; |
| 160 | int code; |
| 161 | struct sigcontext *psc; |
| 162 | char retcode[8]; |
| 163 | unsigned long extramask[_NSIG_WORDS-1]; |
| 164 | struct sigcontext sc; |
| 165 | }; |
| 166 | |
| 167 | struct rt_sigframe |
| 168 | { |
| 169 | char *pretcode; |
| 170 | int sig; |
| 171 | struct siginfo *pinfo; |
| 172 | void *puc; |
| 173 | char retcode[8]; |
| 174 | struct siginfo info; |
| 175 | struct ucontext uc; |
| 176 | }; |
| 177 | |
| 178 | #ifdef CONFIG_FPU |
| 179 | |
| 180 | static unsigned char fpu_version = 0; /* version number of fpu, set by setup_frame */ |
| 181 | |
| 182 | static inline int restore_fpu_state(struct sigcontext *sc) |
| 183 | { |
| 184 | int err = 1; |
| 185 | |
| 186 | if (FPU_IS_EMU) { |
| 187 | /* restore registers */ |
| 188 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); |
| 189 | memcpy(current->thread.fp, sc->sc_fpregs, 24); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | if (sc->sc_fpstate[0]) { |
| 194 | /* Verify the frame format. */ |
| 195 | if (sc->sc_fpstate[0] != fpu_version) |
| 196 | goto out; |
| 197 | |
| 198 | __asm__ volatile (".chip 68k/68881\n\t" |
| 199 | "fmovemx %0,%/fp0-%/fp1\n\t" |
| 200 | "fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t" |
| 201 | ".chip 68k" |
| 202 | : /* no outputs */ |
| 203 | : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl)); |
| 204 | } |
| 205 | __asm__ volatile (".chip 68k/68881\n\t" |
| 206 | "frestore %0\n\t" |
| 207 | ".chip 68k" : : "m" (*sc->sc_fpstate)); |
| 208 | err = 0; |
| 209 | |
| 210 | out: |
| 211 | return err; |
| 212 | } |
| 213 | |
| 214 | #define FPCONTEXT_SIZE 216 |
| 215 | #define uc_fpstate uc_filler[0] |
| 216 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] |
| 217 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] |
| 218 | |
| 219 | static inline int rt_restore_fpu_state(struct ucontext *uc) |
| 220 | { |
| 221 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 222 | int context_size = 0; |
| 223 | fpregset_t fpregs; |
| 224 | int err = 1; |
| 225 | |
| 226 | if (FPU_IS_EMU) { |
| 227 | /* restore fpu control register */ |
| 228 | if (__copy_from_user(current->thread.fpcntl, |
| 229 | &uc->uc_mcontext.fpregs.f_pcr, 12)) |
| 230 | goto out; |
| 231 | /* restore all other fpu register */ |
| 232 | if (__copy_from_user(current->thread.fp, |
| 233 | uc->uc_mcontext.fpregs.f_fpregs, 96)) |
| 234 | goto out; |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | if (__get_user(*(long *)fpstate, (long *)&uc->uc_fpstate)) |
| 239 | goto out; |
| 240 | if (fpstate[0]) { |
| 241 | context_size = fpstate[1]; |
| 242 | |
| 243 | /* Verify the frame format. */ |
| 244 | if (fpstate[0] != fpu_version) |
| 245 | goto out; |
| 246 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, |
| 247 | sizeof(fpregs))) |
| 248 | goto out; |
| 249 | __asm__ volatile (".chip 68k/68881\n\t" |
| 250 | "fmovemx %0,%/fp0-%/fp7\n\t" |
| 251 | "fmoveml %1,%/fpcr/%/fpsr/%/fpiar\n\t" |
| 252 | ".chip 68k" |
| 253 | : /* no outputs */ |
| 254 | : "m" (*fpregs.f_fpregs), |
| 255 | "m" (fpregs.f_pcr)); |
| 256 | } |
| 257 | if (context_size && |
| 258 | __copy_from_user(fpstate + 4, (long *)&uc->uc_fpstate + 1, |
| 259 | context_size)) |
| 260 | goto out; |
| 261 | __asm__ volatile (".chip 68k/68881\n\t" |
| 262 | "frestore %0\n\t" |
| 263 | ".chip 68k" : : "m" (*fpstate)); |
| 264 | err = 0; |
| 265 | |
| 266 | out: |
| 267 | return err; |
| 268 | } |
| 269 | |
| 270 | #endif |
| 271 | |
| 272 | static inline int |
| 273 | restore_sigcontext(struct pt_regs *regs, struct sigcontext *usc, void *fp, |
| 274 | int *pd0) |
| 275 | { |
| 276 | int formatvec; |
| 277 | struct sigcontext context; |
| 278 | int err = 0; |
| 279 | |
| 280 | /* get previous context */ |
| 281 | if (copy_from_user(&context, usc, sizeof(context))) |
| 282 | goto badframe; |
| 283 | |
| 284 | /* restore passed registers */ |
| 285 | regs->d1 = context.sc_d1; |
| 286 | regs->a0 = context.sc_a0; |
| 287 | regs->a1 = context.sc_a1; |
Greg Ungerer | 01829e7 | 2006-01-10 16:42:59 +1000 | [diff] [blame] | 288 | ((struct switch_stack *)regs - 1)->a5 = context.sc_a5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); |
| 290 | regs->pc = context.sc_pc; |
| 291 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 292 | wrusp(context.sc_usp); |
| 293 | formatvec = context.sc_formatvec; |
| 294 | regs->format = formatvec >> 12; |
| 295 | regs->vector = formatvec & 0xfff; |
| 296 | |
| 297 | #ifdef CONFIG_FPU |
| 298 | err = restore_fpu_state(&context); |
| 299 | #endif |
| 300 | |
| 301 | *pd0 = context.sc_d0; |
| 302 | return err; |
| 303 | |
| 304 | badframe: |
| 305 | return 1; |
| 306 | } |
| 307 | |
| 308 | static inline int |
| 309 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, |
| 310 | struct ucontext *uc, int *pd0) |
| 311 | { |
| 312 | int temp; |
| 313 | greg_t *gregs = uc->uc_mcontext.gregs; |
| 314 | unsigned long usp; |
| 315 | int err; |
| 316 | |
| 317 | err = __get_user(temp, &uc->uc_mcontext.version); |
| 318 | if (temp != MCONTEXT_VERSION) |
| 319 | goto badframe; |
| 320 | /* restore passed registers */ |
| 321 | err |= __get_user(regs->d0, &gregs[0]); |
| 322 | err |= __get_user(regs->d1, &gregs[1]); |
| 323 | err |= __get_user(regs->d2, &gregs[2]); |
| 324 | err |= __get_user(regs->d3, &gregs[3]); |
| 325 | err |= __get_user(regs->d4, &gregs[4]); |
| 326 | err |= __get_user(regs->d5, &gregs[5]); |
| 327 | err |= __get_user(sw->d6, &gregs[6]); |
| 328 | err |= __get_user(sw->d7, &gregs[7]); |
| 329 | err |= __get_user(regs->a0, &gregs[8]); |
| 330 | err |= __get_user(regs->a1, &gregs[9]); |
| 331 | err |= __get_user(regs->a2, &gregs[10]); |
| 332 | err |= __get_user(sw->a3, &gregs[11]); |
| 333 | err |= __get_user(sw->a4, &gregs[12]); |
| 334 | err |= __get_user(sw->a5, &gregs[13]); |
| 335 | err |= __get_user(sw->a6, &gregs[14]); |
| 336 | err |= __get_user(usp, &gregs[15]); |
| 337 | wrusp(usp); |
| 338 | err |= __get_user(regs->pc, &gregs[16]); |
| 339 | err |= __get_user(temp, &gregs[17]); |
| 340 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); |
| 341 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 342 | regs->format = temp >> 12; |
| 343 | regs->vector = temp & 0xfff; |
| 344 | |
| 345 | if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) |
| 346 | goto badframe; |
| 347 | |
| 348 | *pd0 = regs->d0; |
| 349 | return err; |
| 350 | |
| 351 | badframe: |
| 352 | return 1; |
| 353 | } |
| 354 | |
| 355 | asmlinkage int do_sigreturn(unsigned long __unused) |
| 356 | { |
| 357 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 358 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 359 | unsigned long usp = rdusp(); |
| 360 | struct sigframe *frame = (struct sigframe *)(usp - 4); |
| 361 | sigset_t set; |
| 362 | int d0; |
| 363 | |
| 364 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 365 | goto badframe; |
| 366 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || |
| 367 | (_NSIG_WORDS > 1 && |
| 368 | __copy_from_user(&set.sig[1], &frame->extramask, |
| 369 | sizeof(frame->extramask)))) |
| 370 | goto badframe; |
| 371 | |
| 372 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 373 | spin_lock_irq(¤t->sighand->siglock); |
| 374 | current->blocked = set; |
| 375 | recalc_sigpending(); |
| 376 | spin_unlock_irq(¤t->sighand->siglock); |
| 377 | |
| 378 | if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0)) |
| 379 | goto badframe; |
| 380 | return d0; |
| 381 | |
| 382 | badframe: |
| 383 | force_sig(SIGSEGV, current); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | asmlinkage int do_rt_sigreturn(unsigned long __unused) |
| 388 | { |
| 389 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 390 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 391 | unsigned long usp = rdusp(); |
| 392 | struct rt_sigframe *frame = (struct rt_sigframe *)(usp - 4); |
| 393 | sigset_t set; |
| 394 | int d0; |
| 395 | |
| 396 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 397 | goto badframe; |
| 398 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 399 | goto badframe; |
| 400 | |
| 401 | sigdelsetmask(&set, ~_BLOCKABLE); |
| 402 | spin_lock_irq(¤t->sighand->siglock); |
| 403 | current->blocked = set; |
| 404 | recalc_sigpending(); |
| 405 | spin_unlock_irq(¤t->sighand->siglock); |
| 406 | |
| 407 | if (rt_restore_ucontext(regs, sw, &frame->uc, &d0)) |
| 408 | goto badframe; |
| 409 | return d0; |
| 410 | |
| 411 | badframe: |
| 412 | force_sig(SIGSEGV, current); |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | #ifdef CONFIG_FPU |
| 417 | /* |
| 418 | * Set up a signal frame. |
| 419 | */ |
| 420 | |
| 421 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) |
| 422 | { |
| 423 | if (FPU_IS_EMU) { |
| 424 | /* save registers */ |
| 425 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); |
| 426 | memcpy(sc->sc_fpregs, current->thread.fp, 24); |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | __asm__ volatile (".chip 68k/68881\n\t" |
| 431 | "fsave %0\n\t" |
| 432 | ".chip 68k" |
| 433 | : : "m" (*sc->sc_fpstate) : "memory"); |
| 434 | |
| 435 | if (sc->sc_fpstate[0]) { |
| 436 | fpu_version = sc->sc_fpstate[0]; |
| 437 | __asm__ volatile (".chip 68k/68881\n\t" |
| 438 | "fmovemx %/fp0-%/fp1,%0\n\t" |
| 439 | "fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t" |
| 440 | ".chip 68k" |
| 441 | : /* no outputs */ |
| 442 | : "m" (*sc->sc_fpregs), |
| 443 | "m" (*sc->sc_fpcntl) |
| 444 | : "memory"); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | static inline int rt_save_fpu_state(struct ucontext *uc, struct pt_regs *regs) |
| 449 | { |
| 450 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 451 | int context_size = 0; |
| 452 | int err = 0; |
| 453 | |
| 454 | if (FPU_IS_EMU) { |
| 455 | /* save fpu control register */ |
| 456 | err |= copy_to_user(&uc->uc_mcontext.fpregs.f_pcr, |
| 457 | current->thread.fpcntl, 12); |
| 458 | /* save all other fpu register */ |
| 459 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, |
| 460 | current->thread.fp, 96); |
| 461 | return err; |
| 462 | } |
| 463 | |
| 464 | __asm__ volatile (".chip 68k/68881\n\t" |
| 465 | "fsave %0\n\t" |
| 466 | ".chip 68k" |
| 467 | : : "m" (*fpstate) : "memory"); |
| 468 | |
| 469 | err |= __put_user(*(long *)fpstate, (long *)&uc->uc_fpstate); |
| 470 | if (fpstate[0]) { |
| 471 | fpregset_t fpregs; |
| 472 | context_size = fpstate[1]; |
| 473 | fpu_version = fpstate[0]; |
| 474 | __asm__ volatile (".chip 68k/68881\n\t" |
| 475 | "fmovemx %/fp0-%/fp7,%0\n\t" |
| 476 | "fmoveml %/fpcr/%/fpsr/%/fpiar,%1\n\t" |
| 477 | ".chip 68k" |
| 478 | : /* no outputs */ |
| 479 | : "m" (*fpregs.f_fpregs), |
| 480 | "m" (fpregs.f_pcr) |
| 481 | : "memory"); |
| 482 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, |
| 483 | sizeof(fpregs)); |
| 484 | } |
| 485 | if (context_size) |
| 486 | err |= copy_to_user((long *)&uc->uc_fpstate + 1, fpstate + 4, |
| 487 | context_size); |
| 488 | return err; |
| 489 | } |
| 490 | |
| 491 | #endif |
| 492 | |
| 493 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
| 494 | unsigned long mask) |
| 495 | { |
| 496 | sc->sc_mask = mask; |
| 497 | sc->sc_usp = rdusp(); |
| 498 | sc->sc_d0 = regs->d0; |
| 499 | sc->sc_d1 = regs->d1; |
| 500 | sc->sc_a0 = regs->a0; |
| 501 | sc->sc_a1 = regs->a1; |
Greg Ungerer | 01829e7 | 2006-01-10 16:42:59 +1000 | [diff] [blame] | 502 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | sc->sc_sr = regs->sr; |
| 504 | sc->sc_pc = regs->pc; |
| 505 | sc->sc_formatvec = regs->format << 12 | regs->vector; |
| 506 | #ifdef CONFIG_FPU |
| 507 | save_fpu_state(sc, regs); |
| 508 | #endif |
| 509 | } |
| 510 | |
| 511 | static inline int rt_setup_ucontext(struct ucontext *uc, struct pt_regs *regs) |
| 512 | { |
| 513 | struct switch_stack *sw = (struct switch_stack *)regs - 1; |
| 514 | greg_t *gregs = uc->uc_mcontext.gregs; |
| 515 | int err = 0; |
| 516 | |
| 517 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); |
| 518 | err |= __put_user(regs->d0, &gregs[0]); |
| 519 | err |= __put_user(regs->d1, &gregs[1]); |
| 520 | err |= __put_user(regs->d2, &gregs[2]); |
| 521 | err |= __put_user(regs->d3, &gregs[3]); |
| 522 | err |= __put_user(regs->d4, &gregs[4]); |
| 523 | err |= __put_user(regs->d5, &gregs[5]); |
| 524 | err |= __put_user(sw->d6, &gregs[6]); |
| 525 | err |= __put_user(sw->d7, &gregs[7]); |
| 526 | err |= __put_user(regs->a0, &gregs[8]); |
| 527 | err |= __put_user(regs->a1, &gregs[9]); |
| 528 | err |= __put_user(regs->a2, &gregs[10]); |
| 529 | err |= __put_user(sw->a3, &gregs[11]); |
| 530 | err |= __put_user(sw->a4, &gregs[12]); |
| 531 | err |= __put_user(sw->a5, &gregs[13]); |
| 532 | err |= __put_user(sw->a6, &gregs[14]); |
| 533 | err |= __put_user(rdusp(), &gregs[15]); |
| 534 | err |= __put_user(regs->pc, &gregs[16]); |
| 535 | err |= __put_user(regs->sr, &gregs[17]); |
| 536 | #ifdef CONFIG_FPU |
| 537 | err |= rt_save_fpu_state(uc, regs); |
| 538 | #endif |
| 539 | return err; |
| 540 | } |
| 541 | |
| 542 | static inline void push_cache (unsigned long vaddr) |
| 543 | { |
| 544 | } |
| 545 | |
| 546 | static inline void * |
| 547 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) |
| 548 | { |
| 549 | unsigned long usp; |
| 550 | |
| 551 | /* Default to using normal stack. */ |
| 552 | usp = rdusp(); |
| 553 | |
| 554 | /* This is the X/Open sanctioned signal stack switching. */ |
| 555 | if (ka->sa.sa_flags & SA_ONSTACK) { |
Laurent MEYER | d09042d | 2006-06-23 02:05:36 -0700 | [diff] [blame] | 556 | if (!sas_ss_flags(usp)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | usp = current->sas_ss_sp + current->sas_ss_size; |
| 558 | } |
| 559 | return (void *)((usp - frame_size) & -8UL); |
| 560 | } |
| 561 | |
| 562 | static void setup_frame (int sig, struct k_sigaction *ka, |
| 563 | sigset_t *set, struct pt_regs *regs) |
| 564 | { |
| 565 | struct sigframe *frame; |
| 566 | struct sigcontext context; |
| 567 | int err = 0; |
| 568 | |
| 569 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 570 | |
| 571 | err |= __put_user((current_thread_info()->exec_domain |
| 572 | && current_thread_info()->exec_domain->signal_invmap |
| 573 | && sig < 32 |
| 574 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 575 | : sig), |
| 576 | &frame->sig); |
| 577 | |
| 578 | err |= __put_user(regs->vector, &frame->code); |
| 579 | err |= __put_user(&frame->sc, &frame->psc); |
| 580 | |
| 581 | if (_NSIG_WORDS > 1) |
| 582 | err |= copy_to_user(frame->extramask, &set->sig[1], |
| 583 | sizeof(frame->extramask)); |
| 584 | |
| 585 | setup_sigcontext(&context, regs, set->sig[0]); |
| 586 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); |
| 587 | |
| 588 | /* Set up to return from userspace. */ |
| 589 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 590 | /* moveq #,d0; trap #0 */ |
| 591 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), |
| 592 | (long *)(frame->retcode)); |
| 593 | |
| 594 | if (err) |
| 595 | goto give_sigsegv; |
| 596 | |
| 597 | push_cache ((unsigned long) &frame->retcode); |
| 598 | |
| 599 | /* Set up registers for signal handler */ |
| 600 | wrusp ((unsigned long) frame); |
| 601 | regs->pc = (unsigned long) ka->sa.sa_handler; |
Greg Ungerer | 01829e7 | 2006-01-10 16:42:59 +1000 | [diff] [blame] | 602 | ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data; |
| 603 | regs->format = 0x4; /*set format byte to make stack appear modulo 4 |
| 604 | which it will be when doing the rte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
| 606 | adjust_stack: |
| 607 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 608 | if (regs->stkadj) { |
| 609 | struct pt_regs *tregs = |
| 610 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
Greg Ungerer | bb28632 | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 611 | #if defined(DEBUG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj); |
| 613 | #endif |
| 614 | /* This must be copied with decreasing addresses to |
| 615 | handle overlaps. */ |
| 616 | tregs->vector = 0; |
| 617 | tregs->format = 0; |
| 618 | tregs->pc = regs->pc; |
| 619 | tregs->sr = regs->sr; |
| 620 | } |
| 621 | return; |
| 622 | |
| 623 | give_sigsegv: |
| 624 | force_sigsegv(sig, current); |
| 625 | goto adjust_stack; |
| 626 | } |
| 627 | |
| 628 | static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, |
| 629 | sigset_t *set, struct pt_regs *regs) |
| 630 | { |
| 631 | struct rt_sigframe *frame; |
| 632 | int err = 0; |
| 633 | |
| 634 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 635 | |
| 636 | err |= __put_user((current_thread_info()->exec_domain |
| 637 | && current_thread_info()->exec_domain->signal_invmap |
| 638 | && sig < 32 |
| 639 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 640 | : sig), |
| 641 | &frame->sig); |
| 642 | err |= __put_user(&frame->info, &frame->pinfo); |
| 643 | err |= __put_user(&frame->uc, &frame->puc); |
| 644 | err |= copy_siginfo_to_user(&frame->info, info); |
| 645 | |
| 646 | /* Create the ucontext. */ |
| 647 | err |= __put_user(0, &frame->uc.uc_flags); |
| 648 | err |= __put_user(0, &frame->uc.uc_link); |
| 649 | err |= __put_user((void *)current->sas_ss_sp, |
| 650 | &frame->uc.uc_stack.ss_sp); |
| 651 | err |= __put_user(sas_ss_flags(rdusp()), |
| 652 | &frame->uc.uc_stack.ss_flags); |
| 653 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 654 | err |= rt_setup_ucontext(&frame->uc, regs); |
| 655 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 656 | |
| 657 | /* Set up to return from userspace. */ |
| 658 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 659 | /* moveq #,d0; notb d0; trap #0 */ |
| 660 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), |
| 661 | (long *)(frame->retcode + 0)); |
| 662 | err |= __put_user(0x4e40, (short *)(frame->retcode + 4)); |
| 663 | |
| 664 | if (err) |
| 665 | goto give_sigsegv; |
| 666 | |
| 667 | push_cache ((unsigned long) &frame->retcode); |
| 668 | |
| 669 | /* Set up registers for signal handler */ |
| 670 | wrusp ((unsigned long) frame); |
| 671 | regs->pc = (unsigned long) ka->sa.sa_handler; |
Greg Ungerer | 01829e7 | 2006-01-10 16:42:59 +1000 | [diff] [blame] | 672 | ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data; |
| 673 | regs->format = 0x4; /*set format byte to make stack appear modulo 4 |
| 674 | which it will be when doing the rte */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
| 676 | adjust_stack: |
| 677 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 678 | if (regs->stkadj) { |
| 679 | struct pt_regs *tregs = |
| 680 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
Greg Ungerer | bb28632 | 2006-06-26 10:33:10 +1000 | [diff] [blame] | 681 | #if defined(DEBUG) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | printk(KERN_DEBUG "Performing stackadjust=%04x\n", regs->stkadj); |
| 683 | #endif |
| 684 | /* This must be copied with decreasing addresses to |
| 685 | handle overlaps. */ |
| 686 | tregs->vector = 0; |
| 687 | tregs->format = 0; |
| 688 | tregs->pc = regs->pc; |
| 689 | tregs->sr = regs->sr; |
| 690 | } |
| 691 | return; |
| 692 | |
| 693 | give_sigsegv: |
| 694 | force_sigsegv(sig, current); |
| 695 | goto adjust_stack; |
| 696 | } |
| 697 | |
| 698 | static inline void |
| 699 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) |
| 700 | { |
| 701 | switch (regs->d0) { |
| 702 | case -ERESTARTNOHAND: |
| 703 | if (!has_handler) |
| 704 | goto do_restart; |
| 705 | regs->d0 = -EINTR; |
| 706 | break; |
| 707 | |
| 708 | case -ERESTARTSYS: |
| 709 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { |
| 710 | regs->d0 = -EINTR; |
| 711 | break; |
| 712 | } |
| 713 | /* fallthrough */ |
| 714 | case -ERESTARTNOINTR: |
| 715 | do_restart: |
| 716 | regs->d0 = regs->orig_d0; |
| 717 | regs->pc -= 2; |
| 718 | break; |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * OK, we're invoking a handler |
| 724 | */ |
| 725 | static void |
| 726 | handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 727 | sigset_t *oldset, struct pt_regs *regs) |
| 728 | { |
| 729 | /* are we from a system call? */ |
| 730 | if (regs->orig_d0 >= 0) |
| 731 | /* If so, check system call restarting.. */ |
| 732 | handle_restart(regs, ka, 1); |
| 733 | |
| 734 | /* set up the stack frame */ |
| 735 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 736 | setup_rt_frame(sig, ka, info, oldset, regs); |
| 737 | else |
| 738 | setup_frame(sig, ka, oldset, regs); |
| 739 | |
| 740 | if (ka->sa.sa_flags & SA_ONESHOT) |
| 741 | ka->sa.sa_handler = SIG_DFL; |
| 742 | |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 743 | spin_lock_irq(¤t->sighand->siglock); |
| 744 | sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); |
| 745 | if (!(ka->sa.sa_flags & SA_NODEFER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | sigaddset(¤t->blocked,sig); |
Steven Rostedt | 69be8f1 | 2005-08-29 11:44:09 -0400 | [diff] [blame] | 747 | recalc_sigpending(); |
| 748 | spin_unlock_irq(¤t->sighand->siglock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | /* |
| 752 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 753 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 754 | * mistake. |
| 755 | */ |
| 756 | asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs) |
| 757 | { |
| 758 | struct k_sigaction ka; |
| 759 | siginfo_t info; |
| 760 | int signr; |
| 761 | |
| 762 | /* |
| 763 | * We want the common case to go fast, which |
| 764 | * is why we may in certain cases get here from |
| 765 | * kernel mode. Just return without doing anything |
| 766 | * if so. |
| 767 | */ |
| 768 | if (!user_mode(regs)) |
| 769 | return 1; |
| 770 | |
| 771 | if (!oldset) |
| 772 | oldset = ¤t->blocked; |
| 773 | |
| 774 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 775 | if (signr > 0) { |
| 776 | /* Whee! Actually deliver the signal. */ |
| 777 | handle_signal(signr, &ka, &info, oldset, regs); |
| 778 | return 1; |
| 779 | } |
| 780 | |
| 781 | /* Did we come from a system call? */ |
| 782 | if (regs->orig_d0 >= 0) { |
| 783 | /* Restart the system call - no handlers present */ |
| 784 | if (regs->d0 == -ERESTARTNOHAND |
| 785 | || regs->d0 == -ERESTARTSYS |
| 786 | || regs->d0 == -ERESTARTNOINTR) { |
| 787 | regs->d0 = regs->orig_d0; |
| 788 | regs->pc -= 2; |
| 789 | } else if (regs->d0 == -ERESTART_RESTARTBLOCK) { |
| 790 | regs->d0 = __NR_restart_syscall; |
| 791 | regs->pc -= 2; |
| 792 | } |
| 793 | } |
| 794 | return 0; |
| 795 | } |