Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/m68k/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/personality.h> |
| 43 | #include <linux/tty.h> |
| 44 | #include <linux/binfmts.h> |
| 45 | #include <linux/module.h> |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 46 | #include <linux/tracehook.h> |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 47 | |
| 48 | #include <asm/setup.h> |
| 49 | #include <asm/uaccess.h> |
| 50 | #include <asm/pgtable.h> |
| 51 | #include <asm/traps.h> |
| 52 | #include <asm/ucontext.h> |
| 53 | |
Greg Ungerer | 66d857b | 2011-03-22 13:39:27 +1000 | [diff] [blame] | 54 | #ifdef CONFIG_MMU |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 55 | |
| 56 | /* |
| 57 | * Handle the slight differences in classic 68k and ColdFire trap frames. |
| 58 | */ |
| 59 | #ifdef CONFIG_COLDFIRE |
| 60 | #define FORMAT 4 |
| 61 | #define FMT4SIZE 0 |
Maxim Kuvyrkov | 00ebfe58 | 2009-09-23 01:22:43 +0400 | [diff] [blame] | 62 | #else |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 63 | #define FORMAT 0 |
| 64 | #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4) |
Maxim Kuvyrkov | 00ebfe58 | 2009-09-23 01:22:43 +0400 | [diff] [blame] | 65 | #endif |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 66 | |
| 67 | static const int frame_size_change[16] = { |
| 68 | [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ |
| 69 | [2] = sizeof(((struct frame *)0)->un.fmt2), |
| 70 | [3] = sizeof(((struct frame *)0)->un.fmt3), |
| 71 | [4] = FMT4SIZE, |
| 72 | [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */ |
| 73 | [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */ |
| 74 | [7] = sizeof(((struct frame *)0)->un.fmt7), |
| 75 | [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */ |
| 76 | [9] = sizeof(((struct frame *)0)->un.fmt9), |
| 77 | [10] = sizeof(((struct frame *)0)->un.fmta), |
| 78 | [11] = sizeof(((struct frame *)0)->un.fmtb), |
| 79 | [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */ |
| 80 | [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */ |
| 81 | [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */ |
| 82 | [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ |
| 83 | }; |
| 84 | |
| 85 | static inline int frame_extra_sizes(int f) |
| 86 | { |
| 87 | return frame_size_change[f]; |
| 88 | } |
| 89 | |
| 90 | int handle_kernel_fault(struct pt_regs *regs) |
| 91 | { |
| 92 | const struct exception_table_entry *fixup; |
| 93 | struct pt_regs *tregs; |
| 94 | |
| 95 | /* Are we prepared to handle this kernel fault? */ |
| 96 | fixup = search_exception_tables(regs->pc); |
| 97 | if (!fixup) |
| 98 | return 0; |
| 99 | |
| 100 | /* Create a new four word stack frame, discarding the old one. */ |
| 101 | regs->stkadj = frame_extra_sizes(regs->format); |
| 102 | tregs = (struct pt_regs *)((long)regs + regs->stkadj); |
| 103 | tregs->vector = regs->vector; |
| 104 | tregs->format = FORMAT; |
| 105 | tregs->pc = fixup->fixup; |
| 106 | tregs->sr = regs->sr; |
| 107 | |
| 108 | return 1; |
| 109 | } |
| 110 | |
| 111 | void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) |
| 112 | { |
| 113 | if (regs->orig_d0 < 0) |
| 114 | return; |
| 115 | switch (regs->d0) { |
| 116 | case -ERESTARTNOHAND: |
| 117 | case -ERESTARTSYS: |
| 118 | case -ERESTARTNOINTR: |
| 119 | regs->d0 = regs->orig_d0; |
| 120 | regs->orig_d0 = -1; |
| 121 | regs->pc -= 2; |
| 122 | break; |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | static inline void push_cache (unsigned long vaddr) |
| 127 | { |
| 128 | /* |
| 129 | * Using the old cache_push_v() was really a big waste. |
| 130 | * |
| 131 | * What we are trying to do is to flush 8 bytes to ram. |
| 132 | * Flushing 2 cache lines of 16 bytes is much cheaper than |
| 133 | * flushing 1 or 2 pages, as previously done in |
| 134 | * cache_push_v(). |
| 135 | * Jes |
| 136 | */ |
| 137 | if (CPU_IS_040) { |
| 138 | unsigned long temp; |
| 139 | |
| 140 | __asm__ __volatile__ (".chip 68040\n\t" |
| 141 | "nop\n\t" |
| 142 | "ptestr (%1)\n\t" |
| 143 | "movec %%mmusr,%0\n\t" |
| 144 | ".chip 68k" |
| 145 | : "=r" (temp) |
| 146 | : "a" (vaddr)); |
| 147 | |
| 148 | temp &= PAGE_MASK; |
| 149 | temp |= vaddr & ~PAGE_MASK; |
| 150 | |
| 151 | __asm__ __volatile__ (".chip 68040\n\t" |
| 152 | "nop\n\t" |
| 153 | "cpushl %%bc,(%0)\n\t" |
| 154 | ".chip 68k" |
| 155 | : : "a" (temp)); |
| 156 | } |
| 157 | else if (CPU_IS_060) { |
| 158 | unsigned long temp; |
| 159 | __asm__ __volatile__ (".chip 68060\n\t" |
| 160 | "plpar (%0)\n\t" |
| 161 | ".chip 68k" |
| 162 | : "=a" (temp) |
| 163 | : "0" (vaddr)); |
| 164 | __asm__ __volatile__ (".chip 68060\n\t" |
| 165 | "cpushl %%bc,(%0)\n\t" |
| 166 | ".chip 68k" |
| 167 | : : "a" (temp)); |
| 168 | } else if (!CPU_IS_COLDFIRE) { |
| 169 | /* |
| 170 | * 68030/68020 have no writeback cache; |
| 171 | * still need to clear icache. |
| 172 | * Note that vaddr is guaranteed to be long word aligned. |
| 173 | */ |
| 174 | unsigned long temp; |
| 175 | asm volatile ("movec %%cacr,%0" : "=r" (temp)); |
| 176 | temp += 4; |
| 177 | asm volatile ("movec %0,%%caar\n\t" |
| 178 | "movec %1,%%cacr" |
| 179 | : : "r" (vaddr), "r" (temp)); |
| 180 | asm volatile ("movec %0,%%caar\n\t" |
| 181 | "movec %1,%%cacr" |
| 182 | : : "r" (vaddr + 4), "r" (temp)); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | static inline void adjustformat(struct pt_regs *regs) |
| 187 | { |
| 188 | } |
| 189 | |
| 190 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) |
| 191 | { |
| 192 | } |
| 193 | |
| 194 | #else /* CONFIG_MMU */ |
| 195 | |
| 196 | void ret_from_user_signal(void); |
| 197 | void ret_from_user_rt_signal(void); |
| 198 | |
| 199 | static inline int frame_extra_sizes(int f) |
| 200 | { |
| 201 | /* No frame size adjustments required on non-MMU CPUs */ |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static inline void adjustformat(struct pt_regs *regs) |
| 206 | { |
| 207 | ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data; |
| 208 | /* |
| 209 | * set format byte to make stack appear modulo 4, which it will |
| 210 | * be when doing the rte |
| 211 | */ |
| 212 | regs->format = 0x4; |
| 213 | } |
| 214 | |
| 215 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) |
| 216 | { |
| 217 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; |
| 218 | } |
| 219 | |
| 220 | static inline void push_cache(unsigned long vaddr) |
| 221 | { |
| 222 | } |
| 223 | |
| 224 | #endif /* CONFIG_MMU */ |
| 225 | |
| 226 | /* |
| 227 | * Atomically swap in the new signal mask, and wait for a signal. |
| 228 | */ |
| 229 | asmlinkage int |
| 230 | sys_sigsuspend(int unused0, int unused1, old_sigset_t mask) |
| 231 | { |
Al Viro | 68f3f16 | 2012-05-21 21:42:32 -0400 | [diff] [blame] | 232 | sigset_t blocked; |
| 233 | siginitset(&blocked, mask); |
| 234 | return sigsuspend(&blocked); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | asmlinkage int |
| 238 | sys_sigaction(int sig, const struct old_sigaction __user *act, |
| 239 | struct old_sigaction __user *oact) |
| 240 | { |
| 241 | struct k_sigaction new_ka, old_ka; |
| 242 | int ret; |
| 243 | |
| 244 | if (act) { |
| 245 | old_sigset_t mask; |
| 246 | if (!access_ok(VERIFY_READ, act, sizeof(*act)) || |
| 247 | __get_user(new_ka.sa.sa_handler, &act->sa_handler) || |
| 248 | __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || |
| 249 | __get_user(new_ka.sa.sa_flags, &act->sa_flags) || |
| 250 | __get_user(mask, &act->sa_mask)) |
| 251 | return -EFAULT; |
| 252 | siginitset(&new_ka.sa.sa_mask, mask); |
| 253 | } |
| 254 | |
| 255 | ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); |
| 256 | |
| 257 | if (!ret && oact) { |
| 258 | if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || |
| 259 | __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || |
| 260 | __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || |
| 261 | __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || |
| 262 | __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) |
| 263 | return -EFAULT; |
| 264 | } |
| 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | asmlinkage int |
| 270 | sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) |
| 271 | { |
| 272 | return do_sigaltstack(uss, uoss, rdusp()); |
| 273 | } |
| 274 | |
| 275 | |
| 276 | /* |
| 277 | * Do a signal return; undo the signal stack. |
| 278 | * |
| 279 | * Keep the return code on the stack quadword aligned! |
| 280 | * That makes the cache flush below easier. |
| 281 | */ |
| 282 | |
| 283 | struct sigframe |
| 284 | { |
| 285 | char __user *pretcode; |
| 286 | int sig; |
| 287 | int code; |
| 288 | struct sigcontext __user *psc; |
| 289 | char retcode[8]; |
| 290 | unsigned long extramask[_NSIG_WORDS-1]; |
| 291 | struct sigcontext sc; |
| 292 | }; |
| 293 | |
| 294 | struct rt_sigframe |
| 295 | { |
| 296 | char __user *pretcode; |
| 297 | int sig; |
| 298 | struct siginfo __user *pinfo; |
| 299 | void __user *puc; |
| 300 | char retcode[8]; |
| 301 | struct siginfo info; |
| 302 | struct ucontext uc; |
| 303 | }; |
| 304 | |
| 305 | #define FPCONTEXT_SIZE 216 |
| 306 | #define uc_fpstate uc_filler[0] |
| 307 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] |
| 308 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] |
| 309 | |
| 310 | #ifdef CONFIG_FPU |
| 311 | |
| 312 | static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ |
| 313 | |
| 314 | static inline int restore_fpu_state(struct sigcontext *sc) |
| 315 | { |
| 316 | int err = 1; |
| 317 | |
| 318 | if (FPU_IS_EMU) { |
| 319 | /* restore registers */ |
| 320 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); |
| 321 | memcpy(current->thread.fp, sc->sc_fpregs, 24); |
| 322 | return 0; |
| 323 | } |
| 324 | |
| 325 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { |
| 326 | /* Verify the frame format. */ |
| 327 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && |
| 328 | (sc->sc_fpstate[0] != fpu_version)) |
| 329 | goto out; |
| 330 | if (CPU_IS_020_OR_030) { |
| 331 | if (m68k_fputype & FPU_68881 && |
| 332 | !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) |
| 333 | goto out; |
| 334 | if (m68k_fputype & FPU_68882 && |
| 335 | !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) |
| 336 | goto out; |
| 337 | } else if (CPU_IS_040) { |
| 338 | if (!(sc->sc_fpstate[1] == 0x00 || |
| 339 | sc->sc_fpstate[1] == 0x28 || |
| 340 | sc->sc_fpstate[1] == 0x60)) |
| 341 | goto out; |
| 342 | } else if (CPU_IS_060) { |
| 343 | if (!(sc->sc_fpstate[3] == 0x00 || |
| 344 | sc->sc_fpstate[3] == 0x60 || |
| 345 | sc->sc_fpstate[3] == 0xe0)) |
| 346 | goto out; |
| 347 | } else if (CPU_IS_COLDFIRE) { |
| 348 | if (!(sc->sc_fpstate[0] == 0x00 || |
| 349 | sc->sc_fpstate[0] == 0x05 || |
| 350 | sc->sc_fpstate[0] == 0xe5)) |
| 351 | goto out; |
| 352 | } else |
| 353 | goto out; |
| 354 | |
| 355 | if (CPU_IS_COLDFIRE) { |
| 356 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" |
| 357 | "fmovel %1,%%fpcr\n\t" |
| 358 | "fmovel %2,%%fpsr\n\t" |
| 359 | "fmovel %3,%%fpiar" |
| 360 | : /* no outputs */ |
| 361 | : "m" (sc->sc_fpregs[0]), |
| 362 | "m" (sc->sc_fpcntl[0]), |
| 363 | "m" (sc->sc_fpcntl[1]), |
| 364 | "m" (sc->sc_fpcntl[2])); |
| 365 | } else { |
| 366 | __asm__ volatile (".chip 68k/68881\n\t" |
| 367 | "fmovemx %0,%%fp0-%%fp1\n\t" |
| 368 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" |
| 369 | ".chip 68k" |
| 370 | : /* no outputs */ |
| 371 | : "m" (*sc->sc_fpregs), |
| 372 | "m" (*sc->sc_fpcntl)); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | if (CPU_IS_COLDFIRE) { |
| 377 | __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); |
| 378 | } else { |
| 379 | __asm__ volatile (".chip 68k/68881\n\t" |
| 380 | "frestore %0\n\t" |
| 381 | ".chip 68k" |
| 382 | : : "m" (*sc->sc_fpstate)); |
| 383 | } |
| 384 | err = 0; |
| 385 | |
| 386 | out: |
| 387 | return err; |
| 388 | } |
| 389 | |
| 390 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) |
| 391 | { |
| 392 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 393 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); |
| 394 | fpregset_t fpregs; |
| 395 | int err = 1; |
| 396 | |
| 397 | if (FPU_IS_EMU) { |
| 398 | /* restore fpu control register */ |
| 399 | if (__copy_from_user(current->thread.fpcntl, |
| 400 | uc->uc_mcontext.fpregs.f_fpcntl, 12)) |
| 401 | goto out; |
| 402 | /* restore all other fpu register */ |
| 403 | if (__copy_from_user(current->thread.fp, |
| 404 | uc->uc_mcontext.fpregs.f_fpregs, 96)) |
| 405 | goto out; |
| 406 | return 0; |
| 407 | } |
| 408 | |
| 409 | if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) |
| 410 | goto out; |
| 411 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { |
| 412 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) |
| 413 | context_size = fpstate[1]; |
| 414 | /* Verify the frame format. */ |
| 415 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && |
| 416 | (fpstate[0] != fpu_version)) |
| 417 | goto out; |
| 418 | if (CPU_IS_020_OR_030) { |
| 419 | if (m68k_fputype & FPU_68881 && |
| 420 | !(context_size == 0x18 || context_size == 0xb4)) |
| 421 | goto out; |
| 422 | if (m68k_fputype & FPU_68882 && |
| 423 | !(context_size == 0x38 || context_size == 0xd4)) |
| 424 | goto out; |
| 425 | } else if (CPU_IS_040) { |
| 426 | if (!(context_size == 0x00 || |
| 427 | context_size == 0x28 || |
| 428 | context_size == 0x60)) |
| 429 | goto out; |
| 430 | } else if (CPU_IS_060) { |
| 431 | if (!(fpstate[3] == 0x00 || |
| 432 | fpstate[3] == 0x60 || |
| 433 | fpstate[3] == 0xe0)) |
| 434 | goto out; |
| 435 | } else if (CPU_IS_COLDFIRE) { |
| 436 | if (!(fpstate[3] == 0x00 || |
| 437 | fpstate[3] == 0x05 || |
| 438 | fpstate[3] == 0xe5)) |
| 439 | goto out; |
| 440 | } else |
| 441 | goto out; |
| 442 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, |
| 443 | sizeof(fpregs))) |
| 444 | goto out; |
| 445 | |
| 446 | if (CPU_IS_COLDFIRE) { |
| 447 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" |
| 448 | "fmovel %1,%%fpcr\n\t" |
| 449 | "fmovel %2,%%fpsr\n\t" |
| 450 | "fmovel %3,%%fpiar" |
| 451 | : /* no outputs */ |
| 452 | : "m" (fpregs.f_fpregs[0]), |
| 453 | "m" (fpregs.f_fpcntl[0]), |
| 454 | "m" (fpregs.f_fpcntl[1]), |
| 455 | "m" (fpregs.f_fpcntl[2])); |
| 456 | } else { |
| 457 | __asm__ volatile (".chip 68k/68881\n\t" |
| 458 | "fmovemx %0,%%fp0-%%fp7\n\t" |
| 459 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" |
| 460 | ".chip 68k" |
| 461 | : /* no outputs */ |
| 462 | : "m" (*fpregs.f_fpregs), |
| 463 | "m" (*fpregs.f_fpcntl)); |
| 464 | } |
| 465 | } |
| 466 | if (context_size && |
| 467 | __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, |
| 468 | context_size)) |
| 469 | goto out; |
| 470 | |
| 471 | if (CPU_IS_COLDFIRE) { |
| 472 | __asm__ volatile ("frestore %0" : : "m" (*fpstate)); |
| 473 | } else { |
| 474 | __asm__ volatile (".chip 68k/68881\n\t" |
| 475 | "frestore %0\n\t" |
| 476 | ".chip 68k" |
| 477 | : : "m" (*fpstate)); |
| 478 | } |
| 479 | err = 0; |
| 480 | |
| 481 | out: |
| 482 | return err; |
| 483 | } |
| 484 | |
| 485 | /* |
| 486 | * Set up a signal frame. |
| 487 | */ |
| 488 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) |
| 489 | { |
| 490 | if (FPU_IS_EMU) { |
| 491 | /* save registers */ |
| 492 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); |
| 493 | memcpy(sc->sc_fpregs, current->thread.fp, 24); |
| 494 | return; |
| 495 | } |
| 496 | |
| 497 | if (CPU_IS_COLDFIRE) { |
| 498 | __asm__ volatile ("fsave %0" |
| 499 | : : "m" (*sc->sc_fpstate) : "memory"); |
| 500 | } else { |
| 501 | __asm__ volatile (".chip 68k/68881\n\t" |
| 502 | "fsave %0\n\t" |
| 503 | ".chip 68k" |
| 504 | : : "m" (*sc->sc_fpstate) : "memory"); |
| 505 | } |
| 506 | |
| 507 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { |
| 508 | fpu_version = sc->sc_fpstate[0]; |
| 509 | if (CPU_IS_020_OR_030 && |
| 510 | regs->vector >= (VEC_FPBRUC * 4) && |
| 511 | regs->vector <= (VEC_FPNAN * 4)) { |
| 512 | /* Clear pending exception in 68882 idle frame */ |
| 513 | if (*(unsigned short *) sc->sc_fpstate == 0x1f38) |
| 514 | sc->sc_fpstate[0x38] |= 1 << 3; |
| 515 | } |
| 516 | |
| 517 | if (CPU_IS_COLDFIRE) { |
| 518 | __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" |
| 519 | "fmovel %%fpcr,%1\n\t" |
| 520 | "fmovel %%fpsr,%2\n\t" |
| 521 | "fmovel %%fpiar,%3" |
| 522 | : "=m" (sc->sc_fpregs[0]), |
| 523 | "=m" (sc->sc_fpcntl[0]), |
| 524 | "=m" (sc->sc_fpcntl[1]), |
| 525 | "=m" (sc->sc_fpcntl[2]) |
| 526 | : /* no inputs */ |
| 527 | : "memory"); |
| 528 | } else { |
| 529 | __asm__ volatile (".chip 68k/68881\n\t" |
| 530 | "fmovemx %%fp0-%%fp1,%0\n\t" |
| 531 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" |
| 532 | ".chip 68k" |
| 533 | : "=m" (*sc->sc_fpregs), |
| 534 | "=m" (*sc->sc_fpcntl) |
| 535 | : /* no inputs */ |
| 536 | : "memory"); |
| 537 | } |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) |
| 542 | { |
| 543 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 544 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); |
| 545 | int err = 0; |
| 546 | |
| 547 | if (FPU_IS_EMU) { |
| 548 | /* save fpu control register */ |
| 549 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, |
| 550 | current->thread.fpcntl, 12); |
| 551 | /* save all other fpu register */ |
| 552 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, |
| 553 | current->thread.fp, 96); |
| 554 | return err; |
| 555 | } |
| 556 | |
| 557 | if (CPU_IS_COLDFIRE) { |
| 558 | __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); |
| 559 | } else { |
| 560 | __asm__ volatile (".chip 68k/68881\n\t" |
| 561 | "fsave %0\n\t" |
| 562 | ".chip 68k" |
| 563 | : : "m" (*fpstate) : "memory"); |
| 564 | } |
| 565 | |
| 566 | err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); |
| 567 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { |
| 568 | fpregset_t fpregs; |
| 569 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) |
| 570 | context_size = fpstate[1]; |
| 571 | fpu_version = fpstate[0]; |
| 572 | if (CPU_IS_020_OR_030 && |
| 573 | regs->vector >= (VEC_FPBRUC * 4) && |
| 574 | regs->vector <= (VEC_FPNAN * 4)) { |
| 575 | /* Clear pending exception in 68882 idle frame */ |
| 576 | if (*(unsigned short *) fpstate == 0x1f38) |
| 577 | fpstate[0x38] |= 1 << 3; |
| 578 | } |
| 579 | if (CPU_IS_COLDFIRE) { |
| 580 | __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" |
| 581 | "fmovel %%fpcr,%1\n\t" |
| 582 | "fmovel %%fpsr,%2\n\t" |
| 583 | "fmovel %%fpiar,%3" |
| 584 | : "=m" (fpregs.f_fpregs[0]), |
| 585 | "=m" (fpregs.f_fpcntl[0]), |
| 586 | "=m" (fpregs.f_fpcntl[1]), |
| 587 | "=m" (fpregs.f_fpcntl[2]) |
| 588 | : /* no inputs */ |
| 589 | : "memory"); |
| 590 | } else { |
| 591 | __asm__ volatile (".chip 68k/68881\n\t" |
| 592 | "fmovemx %%fp0-%%fp7,%0\n\t" |
| 593 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" |
| 594 | ".chip 68k" |
| 595 | : "=m" (*fpregs.f_fpregs), |
| 596 | "=m" (*fpregs.f_fpcntl) |
| 597 | : /* no inputs */ |
| 598 | : "memory"); |
| 599 | } |
| 600 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, |
| 601 | sizeof(fpregs)); |
| 602 | } |
| 603 | if (context_size) |
| 604 | err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, |
| 605 | context_size); |
| 606 | return err; |
| 607 | } |
| 608 | |
| 609 | #else /* CONFIG_FPU */ |
| 610 | |
| 611 | /* |
| 612 | * For the case with no FPU configured these all do nothing. |
| 613 | */ |
| 614 | static inline int restore_fpu_state(struct sigcontext *sc) |
| 615 | { |
| 616 | return 0; |
| 617 | } |
| 618 | |
| 619 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) |
| 620 | { |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) |
| 625 | { |
| 626 | } |
| 627 | |
| 628 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) |
| 629 | { |
| 630 | return 0; |
| 631 | } |
| 632 | |
| 633 | #endif /* CONFIG_FPU */ |
| 634 | |
| 635 | static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, |
| 636 | void __user *fp) |
| 637 | { |
| 638 | int fsize = frame_extra_sizes(formatvec >> 12); |
| 639 | if (fsize < 0) { |
| 640 | /* |
| 641 | * user process trying to return with weird frame format |
| 642 | */ |
| 643 | #ifdef DEBUG |
| 644 | printk("user process returning with weird frame format\n"); |
| 645 | #endif |
| 646 | return 1; |
| 647 | } |
| 648 | if (!fsize) { |
| 649 | regs->format = formatvec >> 12; |
| 650 | regs->vector = formatvec & 0xfff; |
| 651 | } else { |
| 652 | struct switch_stack *sw = (struct switch_stack *)regs - 1; |
| 653 | unsigned long buf[fsize / 2]; /* yes, twice as much */ |
| 654 | |
| 655 | /* that'll make sure that expansion won't crap over data */ |
| 656 | if (copy_from_user(buf + fsize / 4, fp, fsize)) |
| 657 | return 1; |
| 658 | |
| 659 | /* point of no return */ |
| 660 | regs->format = formatvec >> 12; |
| 661 | regs->vector = formatvec & 0xfff; |
| 662 | #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) |
| 663 | __asm__ __volatile__ ( |
| 664 | #ifdef CONFIG_COLDFIRE |
| 665 | " movel %0,%/sp\n\t" |
| 666 | " bra ret_from_signal\n" |
| 667 | #else |
| 668 | " movel %0,%/a0\n\t" |
| 669 | " subl %1,%/a0\n\t" /* make room on stack */ |
| 670 | " movel %/a0,%/sp\n\t" /* set stack pointer */ |
| 671 | /* move switch_stack and pt_regs */ |
| 672 | "1: movel %0@+,%/a0@+\n\t" |
| 673 | " dbra %2,1b\n\t" |
| 674 | " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ |
| 675 | " lsrl #2,%1\n\t" |
| 676 | " subql #1,%1\n\t" |
| 677 | /* copy to the gap we'd made */ |
| 678 | "2: movel %4@+,%/a0@+\n\t" |
| 679 | " dbra %1,2b\n\t" |
| 680 | " bral ret_from_signal\n" |
| 681 | #endif |
| 682 | : /* no outputs, it doesn't ever return */ |
| 683 | : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), |
| 684 | "n" (frame_offset), "a" (buf + fsize/4) |
| 685 | : "a0"); |
| 686 | #undef frame_offset |
| 687 | } |
| 688 | return 0; |
| 689 | } |
| 690 | |
| 691 | static inline int |
| 692 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) |
| 693 | { |
| 694 | int formatvec; |
| 695 | struct sigcontext context; |
| 696 | int err = 0; |
| 697 | |
| 698 | /* Always make any pending restarted system calls return -EINTR */ |
| 699 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 700 | |
| 701 | /* get previous context */ |
| 702 | if (copy_from_user(&context, usc, sizeof(context))) |
| 703 | goto badframe; |
| 704 | |
| 705 | /* restore passed registers */ |
| 706 | regs->d0 = context.sc_d0; |
| 707 | regs->d1 = context.sc_d1; |
| 708 | regs->a0 = context.sc_a0; |
| 709 | regs->a1 = context.sc_a1; |
| 710 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); |
| 711 | regs->pc = context.sc_pc; |
| 712 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 713 | wrusp(context.sc_usp); |
| 714 | formatvec = context.sc_formatvec; |
| 715 | |
| 716 | err = restore_fpu_state(&context); |
| 717 | |
| 718 | if (err || mangle_kernel_stack(regs, formatvec, fp)) |
| 719 | goto badframe; |
| 720 | |
| 721 | return 0; |
| 722 | |
| 723 | badframe: |
| 724 | return 1; |
| 725 | } |
| 726 | |
| 727 | static inline int |
| 728 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, |
| 729 | struct ucontext __user *uc) |
| 730 | { |
| 731 | int temp; |
| 732 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
| 733 | unsigned long usp; |
| 734 | int err; |
| 735 | |
| 736 | /* Always make any pending restarted system calls return -EINTR */ |
| 737 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 738 | |
| 739 | err = __get_user(temp, &uc->uc_mcontext.version); |
| 740 | if (temp != MCONTEXT_VERSION) |
| 741 | goto badframe; |
| 742 | /* restore passed registers */ |
| 743 | err |= __get_user(regs->d0, &gregs[0]); |
| 744 | err |= __get_user(regs->d1, &gregs[1]); |
| 745 | err |= __get_user(regs->d2, &gregs[2]); |
| 746 | err |= __get_user(regs->d3, &gregs[3]); |
| 747 | err |= __get_user(regs->d4, &gregs[4]); |
| 748 | err |= __get_user(regs->d5, &gregs[5]); |
| 749 | err |= __get_user(sw->d6, &gregs[6]); |
| 750 | err |= __get_user(sw->d7, &gregs[7]); |
| 751 | err |= __get_user(regs->a0, &gregs[8]); |
| 752 | err |= __get_user(regs->a1, &gregs[9]); |
| 753 | err |= __get_user(regs->a2, &gregs[10]); |
| 754 | err |= __get_user(sw->a3, &gregs[11]); |
| 755 | err |= __get_user(sw->a4, &gregs[12]); |
| 756 | err |= __get_user(sw->a5, &gregs[13]); |
| 757 | err |= __get_user(sw->a6, &gregs[14]); |
| 758 | err |= __get_user(usp, &gregs[15]); |
| 759 | wrusp(usp); |
| 760 | err |= __get_user(regs->pc, &gregs[16]); |
| 761 | err |= __get_user(temp, &gregs[17]); |
| 762 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); |
| 763 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 764 | err |= __get_user(temp, &uc->uc_formatvec); |
| 765 | |
| 766 | err |= rt_restore_fpu_state(uc); |
| 767 | |
| 768 | if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) |
| 769 | goto badframe; |
| 770 | |
| 771 | if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) |
| 772 | goto badframe; |
| 773 | |
| 774 | return 0; |
| 775 | |
| 776 | badframe: |
| 777 | return 1; |
| 778 | } |
| 779 | |
| 780 | asmlinkage int do_sigreturn(unsigned long __unused) |
| 781 | { |
| 782 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 783 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 784 | unsigned long usp = rdusp(); |
| 785 | struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); |
| 786 | sigset_t set; |
| 787 | |
| 788 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 789 | goto badframe; |
| 790 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || |
| 791 | (_NSIG_WORDS > 1 && |
| 792 | __copy_from_user(&set.sig[1], &frame->extramask, |
| 793 | sizeof(frame->extramask)))) |
| 794 | goto badframe; |
| 795 | |
Matt Fleming | 43a3599 | 2012-05-11 10:57:59 +1000 | [diff] [blame] | 796 | set_current_blocked(&set); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 797 | |
| 798 | if (restore_sigcontext(regs, &frame->sc, frame + 1)) |
| 799 | goto badframe; |
| 800 | return regs->d0; |
| 801 | |
| 802 | badframe: |
| 803 | force_sig(SIGSEGV, current); |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | asmlinkage int do_rt_sigreturn(unsigned long __unused) |
| 808 | { |
| 809 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 810 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 811 | unsigned long usp = rdusp(); |
| 812 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); |
| 813 | sigset_t set; |
| 814 | |
| 815 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 816 | goto badframe; |
| 817 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 818 | goto badframe; |
| 819 | |
Matt Fleming | 43a3599 | 2012-05-11 10:57:59 +1000 | [diff] [blame] | 820 | set_current_blocked(&set); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 821 | |
| 822 | if (rt_restore_ucontext(regs, sw, &frame->uc)) |
| 823 | goto badframe; |
| 824 | return regs->d0; |
| 825 | |
| 826 | badframe: |
| 827 | force_sig(SIGSEGV, current); |
| 828 | return 0; |
| 829 | } |
| 830 | |
| 831 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
| 832 | unsigned long mask) |
| 833 | { |
| 834 | sc->sc_mask = mask; |
| 835 | sc->sc_usp = rdusp(); |
| 836 | sc->sc_d0 = regs->d0; |
| 837 | sc->sc_d1 = regs->d1; |
| 838 | sc->sc_a0 = regs->a0; |
| 839 | sc->sc_a1 = regs->a1; |
| 840 | sc->sc_sr = regs->sr; |
| 841 | sc->sc_pc = regs->pc; |
| 842 | sc->sc_formatvec = regs->format << 12 | regs->vector; |
| 843 | save_a5_state(sc, regs); |
| 844 | save_fpu_state(sc, regs); |
| 845 | } |
| 846 | |
| 847 | static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) |
| 848 | { |
| 849 | struct switch_stack *sw = (struct switch_stack *)regs - 1; |
| 850 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
| 851 | int err = 0; |
| 852 | |
| 853 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); |
| 854 | err |= __put_user(regs->d0, &gregs[0]); |
| 855 | err |= __put_user(regs->d1, &gregs[1]); |
| 856 | err |= __put_user(regs->d2, &gregs[2]); |
| 857 | err |= __put_user(regs->d3, &gregs[3]); |
| 858 | err |= __put_user(regs->d4, &gregs[4]); |
| 859 | err |= __put_user(regs->d5, &gregs[5]); |
| 860 | err |= __put_user(sw->d6, &gregs[6]); |
| 861 | err |= __put_user(sw->d7, &gregs[7]); |
| 862 | err |= __put_user(regs->a0, &gregs[8]); |
| 863 | err |= __put_user(regs->a1, &gregs[9]); |
| 864 | err |= __put_user(regs->a2, &gregs[10]); |
| 865 | err |= __put_user(sw->a3, &gregs[11]); |
| 866 | err |= __put_user(sw->a4, &gregs[12]); |
| 867 | err |= __put_user(sw->a5, &gregs[13]); |
| 868 | err |= __put_user(sw->a6, &gregs[14]); |
| 869 | err |= __put_user(rdusp(), &gregs[15]); |
| 870 | err |= __put_user(regs->pc, &gregs[16]); |
| 871 | err |= __put_user(regs->sr, &gregs[17]); |
| 872 | err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); |
| 873 | err |= rt_save_fpu_state(uc, regs); |
| 874 | return err; |
| 875 | } |
| 876 | |
| 877 | static inline void __user * |
| 878 | get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) |
| 879 | { |
| 880 | unsigned long usp; |
| 881 | |
| 882 | /* Default to using normal stack. */ |
| 883 | usp = rdusp(); |
| 884 | |
| 885 | /* This is the X/Open sanctioned signal stack switching. */ |
| 886 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 887 | if (!sas_ss_flags(usp)) |
| 888 | usp = current->sas_ss_sp + current->sas_ss_size; |
| 889 | } |
| 890 | return (void __user *)((usp - frame_size) & -8UL); |
| 891 | } |
| 892 | |
| 893 | static int setup_frame (int sig, struct k_sigaction *ka, |
| 894 | sigset_t *set, struct pt_regs *regs) |
| 895 | { |
| 896 | struct sigframe __user *frame; |
| 897 | int fsize = frame_extra_sizes(regs->format); |
| 898 | struct sigcontext context; |
| 899 | int err = 0; |
| 900 | |
| 901 | if (fsize < 0) { |
| 902 | #ifdef DEBUG |
| 903 | printk ("setup_frame: Unknown frame format %#x\n", |
| 904 | regs->format); |
| 905 | #endif |
| 906 | goto give_sigsegv; |
| 907 | } |
| 908 | |
| 909 | frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); |
| 910 | |
| 911 | if (fsize) |
| 912 | err |= copy_to_user (frame + 1, regs + 1, fsize); |
| 913 | |
| 914 | err |= __put_user((current_thread_info()->exec_domain |
| 915 | && current_thread_info()->exec_domain->signal_invmap |
| 916 | && sig < 32 |
| 917 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 918 | : sig), |
| 919 | &frame->sig); |
| 920 | |
| 921 | err |= __put_user(regs->vector, &frame->code); |
| 922 | err |= __put_user(&frame->sc, &frame->psc); |
| 923 | |
| 924 | if (_NSIG_WORDS > 1) |
| 925 | err |= copy_to_user(frame->extramask, &set->sig[1], |
| 926 | sizeof(frame->extramask)); |
| 927 | |
| 928 | setup_sigcontext(&context, regs, set->sig[0]); |
| 929 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); |
| 930 | |
| 931 | /* Set up to return from userspace. */ |
| 932 | #ifdef CONFIG_MMU |
| 933 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 934 | /* moveq #,d0; trap #0 */ |
| 935 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), |
| 936 | (long __user *)(frame->retcode)); |
| 937 | #else |
| 938 | err |= __put_user((void *) ret_from_user_signal, &frame->pretcode); |
| 939 | #endif |
| 940 | |
| 941 | if (err) |
| 942 | goto give_sigsegv; |
| 943 | |
| 944 | push_cache ((unsigned long) &frame->retcode); |
| 945 | |
| 946 | /* |
| 947 | * Set up registers for signal handler. All the state we are about |
| 948 | * to destroy is successfully copied to sigframe. |
| 949 | */ |
| 950 | wrusp ((unsigned long) frame); |
| 951 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 952 | adjustformat(regs); |
| 953 | |
| 954 | /* |
| 955 | * This is subtle; if we build more than one sigframe, all but the |
| 956 | * first one will see frame format 0 and have fsize == 0, so we won't |
| 957 | * screw stkadj. |
| 958 | */ |
| 959 | if (fsize) |
| 960 | regs->stkadj = fsize; |
| 961 | |
| 962 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 963 | if (regs->stkadj) { |
| 964 | struct pt_regs *tregs = |
| 965 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
| 966 | #ifdef DEBUG |
| 967 | printk("Performing stackadjust=%04x\n", regs->stkadj); |
| 968 | #endif |
| 969 | /* This must be copied with decreasing addresses to |
| 970 | handle overlaps. */ |
| 971 | tregs->vector = 0; |
| 972 | tregs->format = 0; |
| 973 | tregs->pc = regs->pc; |
| 974 | tregs->sr = regs->sr; |
| 975 | } |
| 976 | return 0; |
| 977 | |
| 978 | give_sigsegv: |
| 979 | force_sigsegv(sig, current); |
| 980 | return err; |
| 981 | } |
| 982 | |
| 983 | static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, |
| 984 | sigset_t *set, struct pt_regs *regs) |
| 985 | { |
| 986 | struct rt_sigframe __user *frame; |
| 987 | int fsize = frame_extra_sizes(regs->format); |
| 988 | int err = 0; |
| 989 | |
| 990 | if (fsize < 0) { |
| 991 | #ifdef DEBUG |
| 992 | printk ("setup_frame: Unknown frame format %#x\n", |
| 993 | regs->format); |
| 994 | #endif |
| 995 | goto give_sigsegv; |
| 996 | } |
| 997 | |
| 998 | frame = get_sigframe(ka, regs, sizeof(*frame)); |
| 999 | |
| 1000 | if (fsize) |
| 1001 | err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); |
| 1002 | |
| 1003 | err |= __put_user((current_thread_info()->exec_domain |
| 1004 | && current_thread_info()->exec_domain->signal_invmap |
| 1005 | && sig < 32 |
| 1006 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 1007 | : sig), |
| 1008 | &frame->sig); |
| 1009 | err |= __put_user(&frame->info, &frame->pinfo); |
| 1010 | err |= __put_user(&frame->uc, &frame->puc); |
| 1011 | err |= copy_siginfo_to_user(&frame->info, info); |
| 1012 | |
| 1013 | /* Create the ucontext. */ |
| 1014 | err |= __put_user(0, &frame->uc.uc_flags); |
| 1015 | err |= __put_user(NULL, &frame->uc.uc_link); |
| 1016 | err |= __put_user((void __user *)current->sas_ss_sp, |
| 1017 | &frame->uc.uc_stack.ss_sp); |
| 1018 | err |= __put_user(sas_ss_flags(rdusp()), |
| 1019 | &frame->uc.uc_stack.ss_flags); |
| 1020 | err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); |
| 1021 | err |= rt_setup_ucontext(&frame->uc, regs); |
| 1022 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 1023 | |
| 1024 | /* Set up to return from userspace. */ |
| 1025 | #ifdef CONFIG_MMU |
| 1026 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 1027 | #ifdef __mcoldfire__ |
| 1028 | /* movel #__NR_rt_sigreturn,d0; trap #0 */ |
| 1029 | err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); |
| 1030 | err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), |
| 1031 | (long __user *)(frame->retcode + 4)); |
| 1032 | #else |
| 1033 | /* moveq #,d0; notb d0; trap #0 */ |
| 1034 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), |
| 1035 | (long __user *)(frame->retcode + 0)); |
| 1036 | err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); |
| 1037 | #endif |
| 1038 | #else |
| 1039 | err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode); |
| 1040 | #endif /* CONFIG_MMU */ |
| 1041 | |
| 1042 | if (err) |
| 1043 | goto give_sigsegv; |
| 1044 | |
| 1045 | push_cache ((unsigned long) &frame->retcode); |
| 1046 | |
| 1047 | /* |
| 1048 | * Set up registers for signal handler. All the state we are about |
| 1049 | * to destroy is successfully copied to sigframe. |
| 1050 | */ |
| 1051 | wrusp ((unsigned long) frame); |
| 1052 | regs->pc = (unsigned long) ka->sa.sa_handler; |
| 1053 | adjustformat(regs); |
| 1054 | |
| 1055 | /* |
| 1056 | * This is subtle; if we build more than one sigframe, all but the |
| 1057 | * first one will see frame format 0 and have fsize == 0, so we won't |
| 1058 | * screw stkadj. |
| 1059 | */ |
| 1060 | if (fsize) |
| 1061 | regs->stkadj = fsize; |
| 1062 | |
| 1063 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 1064 | if (regs->stkadj) { |
| 1065 | struct pt_regs *tregs = |
| 1066 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
| 1067 | #ifdef DEBUG |
| 1068 | printk("Performing stackadjust=%04x\n", regs->stkadj); |
| 1069 | #endif |
| 1070 | /* This must be copied with decreasing addresses to |
| 1071 | handle overlaps. */ |
| 1072 | tregs->vector = 0; |
| 1073 | tregs->format = 0; |
| 1074 | tregs->pc = regs->pc; |
| 1075 | tregs->sr = regs->sr; |
| 1076 | } |
| 1077 | return 0; |
| 1078 | |
| 1079 | give_sigsegv: |
| 1080 | force_sigsegv(sig, current); |
| 1081 | return err; |
| 1082 | } |
| 1083 | |
| 1084 | static inline void |
| 1085 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) |
| 1086 | { |
| 1087 | switch (regs->d0) { |
| 1088 | case -ERESTARTNOHAND: |
| 1089 | if (!has_handler) |
| 1090 | goto do_restart; |
| 1091 | regs->d0 = -EINTR; |
| 1092 | break; |
| 1093 | |
| 1094 | case -ERESTART_RESTARTBLOCK: |
| 1095 | if (!has_handler) { |
| 1096 | regs->d0 = __NR_restart_syscall; |
| 1097 | regs->pc -= 2; |
| 1098 | break; |
| 1099 | } |
| 1100 | regs->d0 = -EINTR; |
| 1101 | break; |
| 1102 | |
| 1103 | case -ERESTARTSYS: |
| 1104 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { |
| 1105 | regs->d0 = -EINTR; |
| 1106 | break; |
| 1107 | } |
| 1108 | /* fallthrough */ |
| 1109 | case -ERESTARTNOINTR: |
| 1110 | do_restart: |
| 1111 | regs->d0 = regs->orig_d0; |
| 1112 | regs->pc -= 2; |
| 1113 | break; |
| 1114 | } |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * OK, we're invoking a handler |
| 1119 | */ |
| 1120 | static void |
| 1121 | handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 1122 | struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1123 | { |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 1124 | sigset_t *oldset = sigmask_to_save(); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1125 | int err; |
| 1126 | /* are we from a system call? */ |
| 1127 | if (regs->orig_d0 >= 0) |
| 1128 | /* If so, check system call restarting.. */ |
| 1129 | handle_restart(regs, ka, 1); |
| 1130 | |
| 1131 | /* set up the stack frame */ |
| 1132 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 1133 | err = setup_rt_frame(sig, ka, info, oldset, regs); |
| 1134 | else |
| 1135 | err = setup_frame(sig, ka, oldset, regs); |
| 1136 | |
| 1137 | if (err) |
| 1138 | return; |
| 1139 | |
Al Viro | efee984 | 2012-04-28 02:04:15 -0400 | [diff] [blame] | 1140 | signal_delivered(sig, info, ka, regs, 0); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1141 | |
| 1142 | if (test_thread_flag(TIF_DELAYED_TRACE)) { |
| 1143 | regs->sr &= ~0x8000; |
| 1144 | send_sig(SIGTRAP, current, 1); |
| 1145 | } |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | /* |
| 1149 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 1150 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 1151 | * mistake. |
| 1152 | */ |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1153 | static void do_signal(struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1154 | { |
| 1155 | siginfo_t info; |
| 1156 | struct k_sigaction ka; |
| 1157 | int signr; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1158 | |
| 1159 | current->thread.esp0 = (unsigned long) regs; |
| 1160 | |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1161 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 1162 | if (signr > 0) { |
| 1163 | /* Whee! Actually deliver the signal. */ |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 1164 | handle_signal(signr, &ka, &info, regs); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1165 | return; |
| 1166 | } |
| 1167 | |
| 1168 | /* Did we come from a system call? */ |
| 1169 | if (regs->orig_d0 >= 0) |
| 1170 | /* Restart the system call - no handlers present */ |
| 1171 | handle_restart(regs, NULL, 0); |
| 1172 | |
| 1173 | /* If there's no signal to deliver, we just restore the saved mask. */ |
Al Viro | 51a7b44 | 2012-05-21 23:33:55 -0400 | [diff] [blame] | 1174 | restore_saved_sigmask(); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1175 | } |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1176 | |
| 1177 | void do_notify_resume(struct pt_regs *regs) |
| 1178 | { |
| 1179 | if (test_thread_flag(TIF_SIGPENDING)) |
| 1180 | do_signal(regs); |
| 1181 | |
Al Viro | a42c6de | 2012-05-23 14:44:37 -0400 | [diff] [blame] | 1182 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1183 | tracehook_notify_resume(regs); |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1184 | } |