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> |
Alexander Stein | 42cb38b | 2013-06-05 13:42:39 +0200 | [diff] [blame] | 53 | #include <asm/cacheflush.h> |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 54 | |
Greg Ungerer | 66d857b | 2011-03-22 13:39:27 +1000 | [diff] [blame] | 55 | #ifdef CONFIG_MMU |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 56 | |
| 57 | /* |
| 58 | * Handle the slight differences in classic 68k and ColdFire trap frames. |
| 59 | */ |
| 60 | #ifdef CONFIG_COLDFIRE |
| 61 | #define FORMAT 4 |
| 62 | #define FMT4SIZE 0 |
Maxim Kuvyrkov | 00ebfe58 | 2009-09-23 01:22:43 +0400 | [diff] [blame] | 63 | #else |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 64 | #define FORMAT 0 |
| 65 | #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4) |
Maxim Kuvyrkov | 00ebfe58 | 2009-09-23 01:22:43 +0400 | [diff] [blame] | 66 | #endif |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 67 | |
| 68 | static const int frame_size_change[16] = { |
| 69 | [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ |
| 70 | [2] = sizeof(((struct frame *)0)->un.fmt2), |
| 71 | [3] = sizeof(((struct frame *)0)->un.fmt3), |
| 72 | [4] = FMT4SIZE, |
| 73 | [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */ |
| 74 | [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */ |
| 75 | [7] = sizeof(((struct frame *)0)->un.fmt7), |
| 76 | [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */ |
| 77 | [9] = sizeof(((struct frame *)0)->un.fmt9), |
| 78 | [10] = sizeof(((struct frame *)0)->un.fmta), |
| 79 | [11] = sizeof(((struct frame *)0)->un.fmtb), |
| 80 | [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */ |
| 81 | [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */ |
| 82 | [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */ |
| 83 | [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ |
| 84 | }; |
| 85 | |
| 86 | static inline int frame_extra_sizes(int f) |
| 87 | { |
| 88 | return frame_size_change[f]; |
| 89 | } |
| 90 | |
| 91 | int handle_kernel_fault(struct pt_regs *regs) |
| 92 | { |
| 93 | const struct exception_table_entry *fixup; |
| 94 | struct pt_regs *tregs; |
| 95 | |
| 96 | /* Are we prepared to handle this kernel fault? */ |
| 97 | fixup = search_exception_tables(regs->pc); |
| 98 | if (!fixup) |
| 99 | return 0; |
| 100 | |
| 101 | /* Create a new four word stack frame, discarding the old one. */ |
| 102 | regs->stkadj = frame_extra_sizes(regs->format); |
| 103 | tregs = (struct pt_regs *)((long)regs + regs->stkadj); |
| 104 | tregs->vector = regs->vector; |
| 105 | tregs->format = FORMAT; |
| 106 | tregs->pc = fixup->fixup; |
| 107 | tregs->sr = regs->sr; |
| 108 | |
| 109 | return 1; |
| 110 | } |
| 111 | |
Al Viro | b7f9591 | 2012-11-05 13:06:22 -0500 | [diff] [blame] | 112 | void ptrace_signal_deliver(void) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 113 | { |
Al Viro | b7f9591 | 2012-11-05 13:06:22 -0500 | [diff] [blame] | 114 | struct pt_regs *regs = signal_pt_regs(); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 115 | if (regs->orig_d0 < 0) |
| 116 | return; |
| 117 | switch (regs->d0) { |
| 118 | case -ERESTARTNOHAND: |
| 119 | case -ERESTARTSYS: |
| 120 | case -ERESTARTNOINTR: |
| 121 | regs->d0 = regs->orig_d0; |
| 122 | regs->orig_d0 = -1; |
| 123 | regs->pc -= 2; |
| 124 | break; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | static inline void push_cache (unsigned long vaddr) |
| 129 | { |
| 130 | /* |
| 131 | * Using the old cache_push_v() was really a big waste. |
| 132 | * |
| 133 | * What we are trying to do is to flush 8 bytes to ram. |
| 134 | * Flushing 2 cache lines of 16 bytes is much cheaper than |
| 135 | * flushing 1 or 2 pages, as previously done in |
| 136 | * cache_push_v(). |
| 137 | * Jes |
| 138 | */ |
| 139 | if (CPU_IS_040) { |
| 140 | unsigned long temp; |
| 141 | |
| 142 | __asm__ __volatile__ (".chip 68040\n\t" |
| 143 | "nop\n\t" |
| 144 | "ptestr (%1)\n\t" |
| 145 | "movec %%mmusr,%0\n\t" |
| 146 | ".chip 68k" |
| 147 | : "=r" (temp) |
| 148 | : "a" (vaddr)); |
| 149 | |
| 150 | temp &= PAGE_MASK; |
| 151 | temp |= vaddr & ~PAGE_MASK; |
| 152 | |
| 153 | __asm__ __volatile__ (".chip 68040\n\t" |
| 154 | "nop\n\t" |
| 155 | "cpushl %%bc,(%0)\n\t" |
| 156 | ".chip 68k" |
| 157 | : : "a" (temp)); |
| 158 | } |
| 159 | else if (CPU_IS_060) { |
| 160 | unsigned long temp; |
| 161 | __asm__ __volatile__ (".chip 68060\n\t" |
| 162 | "plpar (%0)\n\t" |
| 163 | ".chip 68k" |
| 164 | : "=a" (temp) |
| 165 | : "0" (vaddr)); |
| 166 | __asm__ __volatile__ (".chip 68060\n\t" |
| 167 | "cpushl %%bc,(%0)\n\t" |
| 168 | ".chip 68k" |
| 169 | : : "a" (temp)); |
| 170 | } else if (!CPU_IS_COLDFIRE) { |
| 171 | /* |
| 172 | * 68030/68020 have no writeback cache; |
| 173 | * still need to clear icache. |
| 174 | * Note that vaddr is guaranteed to be long word aligned. |
| 175 | */ |
| 176 | unsigned long temp; |
| 177 | asm volatile ("movec %%cacr,%0" : "=r" (temp)); |
| 178 | temp += 4; |
| 179 | asm volatile ("movec %0,%%caar\n\t" |
| 180 | "movec %1,%%cacr" |
| 181 | : : "r" (vaddr), "r" (temp)); |
| 182 | asm volatile ("movec %0,%%caar\n\t" |
| 183 | "movec %1,%%cacr" |
| 184 | : : "r" (vaddr + 4), "r" (temp)); |
Alexander Stein | 42cb38b | 2013-06-05 13:42:39 +0200 | [diff] [blame] | 185 | } else { |
| 186 | /* CPU_IS_COLDFIRE */ |
| 187 | #if defined(CONFIG_CACHE_COPYBACK) |
| 188 | flush_cf_dcache(0, DCACHE_MAX_ADDR); |
| 189 | #endif |
| 190 | /* Invalidate instruction cache for the pushed bytes */ |
| 191 | clear_cf_icache(vaddr, vaddr + 8); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 192 | } |
| 193 | } |
| 194 | |
| 195 | static inline void adjustformat(struct pt_regs *regs) |
| 196 | { |
| 197 | } |
| 198 | |
| 199 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) |
| 200 | { |
| 201 | } |
| 202 | |
| 203 | #else /* CONFIG_MMU */ |
| 204 | |
| 205 | void ret_from_user_signal(void); |
| 206 | void ret_from_user_rt_signal(void); |
| 207 | |
| 208 | static inline int frame_extra_sizes(int f) |
| 209 | { |
| 210 | /* No frame size adjustments required on non-MMU CPUs */ |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static inline void adjustformat(struct pt_regs *regs) |
| 215 | { |
| 216 | ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data; |
| 217 | /* |
| 218 | * set format byte to make stack appear modulo 4, which it will |
| 219 | * be when doing the rte |
| 220 | */ |
| 221 | regs->format = 0x4; |
| 222 | } |
| 223 | |
| 224 | static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) |
| 225 | { |
| 226 | sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; |
| 227 | } |
| 228 | |
| 229 | static inline void push_cache(unsigned long vaddr) |
| 230 | { |
| 231 | } |
| 232 | |
| 233 | #endif /* CONFIG_MMU */ |
| 234 | |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 235 | /* |
| 236 | * Do a signal return; undo the signal stack. |
| 237 | * |
| 238 | * Keep the return code on the stack quadword aligned! |
| 239 | * That makes the cache flush below easier. |
| 240 | */ |
| 241 | |
| 242 | struct sigframe |
| 243 | { |
| 244 | char __user *pretcode; |
| 245 | int sig; |
| 246 | int code; |
| 247 | struct sigcontext __user *psc; |
| 248 | char retcode[8]; |
| 249 | unsigned long extramask[_NSIG_WORDS-1]; |
| 250 | struct sigcontext sc; |
| 251 | }; |
| 252 | |
| 253 | struct rt_sigframe |
| 254 | { |
| 255 | char __user *pretcode; |
| 256 | int sig; |
| 257 | struct siginfo __user *pinfo; |
| 258 | void __user *puc; |
| 259 | char retcode[8]; |
| 260 | struct siginfo info; |
| 261 | struct ucontext uc; |
| 262 | }; |
| 263 | |
| 264 | #define FPCONTEXT_SIZE 216 |
| 265 | #define uc_fpstate uc_filler[0] |
| 266 | #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] |
| 267 | #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] |
| 268 | |
| 269 | #ifdef CONFIG_FPU |
| 270 | |
| 271 | static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ |
| 272 | |
| 273 | static inline int restore_fpu_state(struct sigcontext *sc) |
| 274 | { |
| 275 | int err = 1; |
| 276 | |
| 277 | if (FPU_IS_EMU) { |
| 278 | /* restore registers */ |
| 279 | memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); |
| 280 | memcpy(current->thread.fp, sc->sc_fpregs, 24); |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { |
| 285 | /* Verify the frame format. */ |
| 286 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && |
| 287 | (sc->sc_fpstate[0] != fpu_version)) |
| 288 | goto out; |
| 289 | if (CPU_IS_020_OR_030) { |
| 290 | if (m68k_fputype & FPU_68881 && |
| 291 | !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) |
| 292 | goto out; |
| 293 | if (m68k_fputype & FPU_68882 && |
| 294 | !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) |
| 295 | goto out; |
| 296 | } else if (CPU_IS_040) { |
| 297 | if (!(sc->sc_fpstate[1] == 0x00 || |
| 298 | sc->sc_fpstate[1] == 0x28 || |
| 299 | sc->sc_fpstate[1] == 0x60)) |
| 300 | goto out; |
| 301 | } else if (CPU_IS_060) { |
| 302 | if (!(sc->sc_fpstate[3] == 0x00 || |
| 303 | sc->sc_fpstate[3] == 0x60 || |
| 304 | sc->sc_fpstate[3] == 0xe0)) |
| 305 | goto out; |
| 306 | } else if (CPU_IS_COLDFIRE) { |
| 307 | if (!(sc->sc_fpstate[0] == 0x00 || |
| 308 | sc->sc_fpstate[0] == 0x05 || |
| 309 | sc->sc_fpstate[0] == 0xe5)) |
| 310 | goto out; |
| 311 | } else |
| 312 | goto out; |
| 313 | |
| 314 | if (CPU_IS_COLDFIRE) { |
| 315 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" |
| 316 | "fmovel %1,%%fpcr\n\t" |
| 317 | "fmovel %2,%%fpsr\n\t" |
| 318 | "fmovel %3,%%fpiar" |
| 319 | : /* no outputs */ |
| 320 | : "m" (sc->sc_fpregs[0]), |
| 321 | "m" (sc->sc_fpcntl[0]), |
| 322 | "m" (sc->sc_fpcntl[1]), |
| 323 | "m" (sc->sc_fpcntl[2])); |
| 324 | } else { |
| 325 | __asm__ volatile (".chip 68k/68881\n\t" |
| 326 | "fmovemx %0,%%fp0-%%fp1\n\t" |
| 327 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" |
| 328 | ".chip 68k" |
| 329 | : /* no outputs */ |
| 330 | : "m" (*sc->sc_fpregs), |
| 331 | "m" (*sc->sc_fpcntl)); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | if (CPU_IS_COLDFIRE) { |
| 336 | __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); |
| 337 | } else { |
| 338 | __asm__ volatile (".chip 68k/68881\n\t" |
| 339 | "frestore %0\n\t" |
| 340 | ".chip 68k" |
| 341 | : : "m" (*sc->sc_fpstate)); |
| 342 | } |
| 343 | err = 0; |
| 344 | |
| 345 | out: |
| 346 | return err; |
| 347 | } |
| 348 | |
| 349 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) |
| 350 | { |
| 351 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 352 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); |
| 353 | fpregset_t fpregs; |
| 354 | int err = 1; |
| 355 | |
| 356 | if (FPU_IS_EMU) { |
| 357 | /* restore fpu control register */ |
| 358 | if (__copy_from_user(current->thread.fpcntl, |
| 359 | uc->uc_mcontext.fpregs.f_fpcntl, 12)) |
| 360 | goto out; |
| 361 | /* restore all other fpu register */ |
| 362 | if (__copy_from_user(current->thread.fp, |
| 363 | uc->uc_mcontext.fpregs.f_fpregs, 96)) |
| 364 | goto out; |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) |
| 369 | goto out; |
| 370 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { |
| 371 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) |
| 372 | context_size = fpstate[1]; |
| 373 | /* Verify the frame format. */ |
| 374 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && |
| 375 | (fpstate[0] != fpu_version)) |
| 376 | goto out; |
| 377 | if (CPU_IS_020_OR_030) { |
| 378 | if (m68k_fputype & FPU_68881 && |
| 379 | !(context_size == 0x18 || context_size == 0xb4)) |
| 380 | goto out; |
| 381 | if (m68k_fputype & FPU_68882 && |
| 382 | !(context_size == 0x38 || context_size == 0xd4)) |
| 383 | goto out; |
| 384 | } else if (CPU_IS_040) { |
| 385 | if (!(context_size == 0x00 || |
| 386 | context_size == 0x28 || |
| 387 | context_size == 0x60)) |
| 388 | goto out; |
| 389 | } else if (CPU_IS_060) { |
| 390 | if (!(fpstate[3] == 0x00 || |
| 391 | fpstate[3] == 0x60 || |
| 392 | fpstate[3] == 0xe0)) |
| 393 | goto out; |
| 394 | } else if (CPU_IS_COLDFIRE) { |
| 395 | if (!(fpstate[3] == 0x00 || |
| 396 | fpstate[3] == 0x05 || |
| 397 | fpstate[3] == 0xe5)) |
| 398 | goto out; |
| 399 | } else |
| 400 | goto out; |
| 401 | if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, |
| 402 | sizeof(fpregs))) |
| 403 | goto out; |
| 404 | |
| 405 | if (CPU_IS_COLDFIRE) { |
| 406 | __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" |
| 407 | "fmovel %1,%%fpcr\n\t" |
| 408 | "fmovel %2,%%fpsr\n\t" |
| 409 | "fmovel %3,%%fpiar" |
| 410 | : /* no outputs */ |
| 411 | : "m" (fpregs.f_fpregs[0]), |
| 412 | "m" (fpregs.f_fpcntl[0]), |
| 413 | "m" (fpregs.f_fpcntl[1]), |
| 414 | "m" (fpregs.f_fpcntl[2])); |
| 415 | } else { |
| 416 | __asm__ volatile (".chip 68k/68881\n\t" |
| 417 | "fmovemx %0,%%fp0-%%fp7\n\t" |
| 418 | "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" |
| 419 | ".chip 68k" |
| 420 | : /* no outputs */ |
| 421 | : "m" (*fpregs.f_fpregs), |
| 422 | "m" (*fpregs.f_fpcntl)); |
| 423 | } |
| 424 | } |
| 425 | if (context_size && |
| 426 | __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, |
| 427 | context_size)) |
| 428 | goto out; |
| 429 | |
| 430 | if (CPU_IS_COLDFIRE) { |
| 431 | __asm__ volatile ("frestore %0" : : "m" (*fpstate)); |
| 432 | } else { |
| 433 | __asm__ volatile (".chip 68k/68881\n\t" |
| 434 | "frestore %0\n\t" |
| 435 | ".chip 68k" |
| 436 | : : "m" (*fpstate)); |
| 437 | } |
| 438 | err = 0; |
| 439 | |
| 440 | out: |
| 441 | return err; |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Set up a signal frame. |
| 446 | */ |
| 447 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) |
| 448 | { |
| 449 | if (FPU_IS_EMU) { |
| 450 | /* save registers */ |
| 451 | memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); |
| 452 | memcpy(sc->sc_fpregs, current->thread.fp, 24); |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | if (CPU_IS_COLDFIRE) { |
| 457 | __asm__ volatile ("fsave %0" |
| 458 | : : "m" (*sc->sc_fpstate) : "memory"); |
| 459 | } else { |
| 460 | __asm__ volatile (".chip 68k/68881\n\t" |
| 461 | "fsave %0\n\t" |
| 462 | ".chip 68k" |
| 463 | : : "m" (*sc->sc_fpstate) : "memory"); |
| 464 | } |
| 465 | |
| 466 | if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { |
| 467 | fpu_version = sc->sc_fpstate[0]; |
| 468 | if (CPU_IS_020_OR_030 && |
| 469 | regs->vector >= (VEC_FPBRUC * 4) && |
| 470 | regs->vector <= (VEC_FPNAN * 4)) { |
| 471 | /* Clear pending exception in 68882 idle frame */ |
| 472 | if (*(unsigned short *) sc->sc_fpstate == 0x1f38) |
| 473 | sc->sc_fpstate[0x38] |= 1 << 3; |
| 474 | } |
| 475 | |
| 476 | if (CPU_IS_COLDFIRE) { |
| 477 | __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" |
| 478 | "fmovel %%fpcr,%1\n\t" |
| 479 | "fmovel %%fpsr,%2\n\t" |
| 480 | "fmovel %%fpiar,%3" |
| 481 | : "=m" (sc->sc_fpregs[0]), |
| 482 | "=m" (sc->sc_fpcntl[0]), |
| 483 | "=m" (sc->sc_fpcntl[1]), |
| 484 | "=m" (sc->sc_fpcntl[2]) |
| 485 | : /* no inputs */ |
| 486 | : "memory"); |
| 487 | } else { |
| 488 | __asm__ volatile (".chip 68k/68881\n\t" |
| 489 | "fmovemx %%fp0-%%fp1,%0\n\t" |
| 490 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" |
| 491 | ".chip 68k" |
| 492 | : "=m" (*sc->sc_fpregs), |
| 493 | "=m" (*sc->sc_fpcntl) |
| 494 | : /* no inputs */ |
| 495 | : "memory"); |
| 496 | } |
| 497 | } |
| 498 | } |
| 499 | |
| 500 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) |
| 501 | { |
| 502 | unsigned char fpstate[FPCONTEXT_SIZE]; |
| 503 | int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); |
| 504 | int err = 0; |
| 505 | |
| 506 | if (FPU_IS_EMU) { |
| 507 | /* save fpu control register */ |
| 508 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, |
| 509 | current->thread.fpcntl, 12); |
| 510 | /* save all other fpu register */ |
| 511 | err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, |
| 512 | current->thread.fp, 96); |
| 513 | return err; |
| 514 | } |
| 515 | |
| 516 | if (CPU_IS_COLDFIRE) { |
| 517 | __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); |
| 518 | } else { |
| 519 | __asm__ volatile (".chip 68k/68881\n\t" |
| 520 | "fsave %0\n\t" |
| 521 | ".chip 68k" |
| 522 | : : "m" (*fpstate) : "memory"); |
| 523 | } |
| 524 | |
| 525 | err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); |
| 526 | if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { |
| 527 | fpregset_t fpregs; |
| 528 | if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) |
| 529 | context_size = fpstate[1]; |
| 530 | fpu_version = fpstate[0]; |
| 531 | if (CPU_IS_020_OR_030 && |
| 532 | regs->vector >= (VEC_FPBRUC * 4) && |
| 533 | regs->vector <= (VEC_FPNAN * 4)) { |
| 534 | /* Clear pending exception in 68882 idle frame */ |
| 535 | if (*(unsigned short *) fpstate == 0x1f38) |
| 536 | fpstate[0x38] |= 1 << 3; |
| 537 | } |
| 538 | if (CPU_IS_COLDFIRE) { |
| 539 | __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" |
| 540 | "fmovel %%fpcr,%1\n\t" |
| 541 | "fmovel %%fpsr,%2\n\t" |
| 542 | "fmovel %%fpiar,%3" |
| 543 | : "=m" (fpregs.f_fpregs[0]), |
| 544 | "=m" (fpregs.f_fpcntl[0]), |
| 545 | "=m" (fpregs.f_fpcntl[1]), |
| 546 | "=m" (fpregs.f_fpcntl[2]) |
| 547 | : /* no inputs */ |
| 548 | : "memory"); |
| 549 | } else { |
| 550 | __asm__ volatile (".chip 68k/68881\n\t" |
| 551 | "fmovemx %%fp0-%%fp7,%0\n\t" |
| 552 | "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" |
| 553 | ".chip 68k" |
| 554 | : "=m" (*fpregs.f_fpregs), |
| 555 | "=m" (*fpregs.f_fpcntl) |
| 556 | : /* no inputs */ |
| 557 | : "memory"); |
| 558 | } |
| 559 | err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, |
| 560 | sizeof(fpregs)); |
| 561 | } |
| 562 | if (context_size) |
| 563 | err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, |
| 564 | context_size); |
| 565 | return err; |
| 566 | } |
| 567 | |
| 568 | #else /* CONFIG_FPU */ |
| 569 | |
| 570 | /* |
| 571 | * For the case with no FPU configured these all do nothing. |
| 572 | */ |
| 573 | static inline int restore_fpu_state(struct sigcontext *sc) |
| 574 | { |
| 575 | return 0; |
| 576 | } |
| 577 | |
| 578 | static inline int rt_restore_fpu_state(struct ucontext __user *uc) |
| 579 | { |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) |
| 584 | { |
| 585 | } |
| 586 | |
| 587 | static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) |
| 588 | { |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | #endif /* CONFIG_FPU */ |
| 593 | |
| 594 | static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, |
| 595 | void __user *fp) |
| 596 | { |
| 597 | int fsize = frame_extra_sizes(formatvec >> 12); |
| 598 | if (fsize < 0) { |
| 599 | /* |
| 600 | * user process trying to return with weird frame format |
| 601 | */ |
| 602 | #ifdef DEBUG |
| 603 | printk("user process returning with weird frame format\n"); |
| 604 | #endif |
| 605 | return 1; |
| 606 | } |
| 607 | if (!fsize) { |
| 608 | regs->format = formatvec >> 12; |
| 609 | regs->vector = formatvec & 0xfff; |
| 610 | } else { |
| 611 | struct switch_stack *sw = (struct switch_stack *)regs - 1; |
| 612 | unsigned long buf[fsize / 2]; /* yes, twice as much */ |
| 613 | |
| 614 | /* that'll make sure that expansion won't crap over data */ |
| 615 | if (copy_from_user(buf + fsize / 4, fp, fsize)) |
| 616 | return 1; |
| 617 | |
| 618 | /* point of no return */ |
| 619 | regs->format = formatvec >> 12; |
| 620 | regs->vector = formatvec & 0xfff; |
| 621 | #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) |
| 622 | __asm__ __volatile__ ( |
| 623 | #ifdef CONFIG_COLDFIRE |
| 624 | " movel %0,%/sp\n\t" |
| 625 | " bra ret_from_signal\n" |
| 626 | #else |
| 627 | " movel %0,%/a0\n\t" |
| 628 | " subl %1,%/a0\n\t" /* make room on stack */ |
| 629 | " movel %/a0,%/sp\n\t" /* set stack pointer */ |
| 630 | /* move switch_stack and pt_regs */ |
| 631 | "1: movel %0@+,%/a0@+\n\t" |
| 632 | " dbra %2,1b\n\t" |
| 633 | " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ |
| 634 | " lsrl #2,%1\n\t" |
| 635 | " subql #1,%1\n\t" |
| 636 | /* copy to the gap we'd made */ |
| 637 | "2: movel %4@+,%/a0@+\n\t" |
| 638 | " dbra %1,2b\n\t" |
| 639 | " bral ret_from_signal\n" |
| 640 | #endif |
| 641 | : /* no outputs, it doesn't ever return */ |
| 642 | : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), |
| 643 | "n" (frame_offset), "a" (buf + fsize/4) |
| 644 | : "a0"); |
| 645 | #undef frame_offset |
| 646 | } |
| 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | static inline int |
| 651 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) |
| 652 | { |
| 653 | int formatvec; |
| 654 | struct sigcontext context; |
| 655 | int err = 0; |
| 656 | |
| 657 | /* Always make any pending restarted system calls return -EINTR */ |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 658 | current->restart_block.fn = do_no_restart_syscall; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 659 | |
| 660 | /* get previous context */ |
| 661 | if (copy_from_user(&context, usc, sizeof(context))) |
| 662 | goto badframe; |
| 663 | |
| 664 | /* restore passed registers */ |
| 665 | regs->d0 = context.sc_d0; |
| 666 | regs->d1 = context.sc_d1; |
| 667 | regs->a0 = context.sc_a0; |
| 668 | regs->a1 = context.sc_a1; |
| 669 | regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); |
| 670 | regs->pc = context.sc_pc; |
| 671 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 672 | wrusp(context.sc_usp); |
| 673 | formatvec = context.sc_formatvec; |
| 674 | |
| 675 | err = restore_fpu_state(&context); |
| 676 | |
| 677 | if (err || mangle_kernel_stack(regs, formatvec, fp)) |
| 678 | goto badframe; |
| 679 | |
| 680 | return 0; |
| 681 | |
| 682 | badframe: |
| 683 | return 1; |
| 684 | } |
| 685 | |
| 686 | static inline int |
| 687 | rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, |
| 688 | struct ucontext __user *uc) |
| 689 | { |
| 690 | int temp; |
| 691 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
| 692 | unsigned long usp; |
| 693 | int err; |
| 694 | |
| 695 | /* Always make any pending restarted system calls return -EINTR */ |
Andy Lutomirski | f56141e | 2015-02-12 15:01:14 -0800 | [diff] [blame] | 696 | current->restart_block.fn = do_no_restart_syscall; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 697 | |
| 698 | err = __get_user(temp, &uc->uc_mcontext.version); |
| 699 | if (temp != MCONTEXT_VERSION) |
| 700 | goto badframe; |
| 701 | /* restore passed registers */ |
| 702 | err |= __get_user(regs->d0, &gregs[0]); |
| 703 | err |= __get_user(regs->d1, &gregs[1]); |
| 704 | err |= __get_user(regs->d2, &gregs[2]); |
| 705 | err |= __get_user(regs->d3, &gregs[3]); |
| 706 | err |= __get_user(regs->d4, &gregs[4]); |
| 707 | err |= __get_user(regs->d5, &gregs[5]); |
| 708 | err |= __get_user(sw->d6, &gregs[6]); |
| 709 | err |= __get_user(sw->d7, &gregs[7]); |
| 710 | err |= __get_user(regs->a0, &gregs[8]); |
| 711 | err |= __get_user(regs->a1, &gregs[9]); |
| 712 | err |= __get_user(regs->a2, &gregs[10]); |
| 713 | err |= __get_user(sw->a3, &gregs[11]); |
| 714 | err |= __get_user(sw->a4, &gregs[12]); |
| 715 | err |= __get_user(sw->a5, &gregs[13]); |
| 716 | err |= __get_user(sw->a6, &gregs[14]); |
| 717 | err |= __get_user(usp, &gregs[15]); |
| 718 | wrusp(usp); |
| 719 | err |= __get_user(regs->pc, &gregs[16]); |
| 720 | err |= __get_user(temp, &gregs[17]); |
| 721 | regs->sr = (regs->sr & 0xff00) | (temp & 0xff); |
| 722 | regs->orig_d0 = -1; /* disable syscall checks */ |
| 723 | err |= __get_user(temp, &uc->uc_formatvec); |
| 724 | |
| 725 | err |= rt_restore_fpu_state(uc); |
Al Viro | 08d4f65 | 2012-12-23 03:06:03 -0500 | [diff] [blame] | 726 | err |= restore_altstack(&uc->uc_stack); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 727 | |
Al Viro | 08d4f65 | 2012-12-23 03:06:03 -0500 | [diff] [blame] | 728 | if (err) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 729 | goto badframe; |
| 730 | |
| 731 | if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) |
| 732 | goto badframe; |
| 733 | |
| 734 | return 0; |
| 735 | |
| 736 | badframe: |
| 737 | return 1; |
| 738 | } |
| 739 | |
| 740 | asmlinkage int do_sigreturn(unsigned long __unused) |
| 741 | { |
| 742 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 743 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 744 | unsigned long usp = rdusp(); |
| 745 | struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); |
| 746 | sigset_t set; |
| 747 | |
| 748 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 749 | goto badframe; |
| 750 | if (__get_user(set.sig[0], &frame->sc.sc_mask) || |
| 751 | (_NSIG_WORDS > 1 && |
| 752 | __copy_from_user(&set.sig[1], &frame->extramask, |
| 753 | sizeof(frame->extramask)))) |
| 754 | goto badframe; |
| 755 | |
Matt Fleming | 43a3599 | 2012-05-11 10:57:59 +1000 | [diff] [blame] | 756 | set_current_blocked(&set); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 757 | |
| 758 | if (restore_sigcontext(regs, &frame->sc, frame + 1)) |
| 759 | goto badframe; |
| 760 | return regs->d0; |
| 761 | |
| 762 | badframe: |
| 763 | force_sig(SIGSEGV, current); |
| 764 | return 0; |
| 765 | } |
| 766 | |
| 767 | asmlinkage int do_rt_sigreturn(unsigned long __unused) |
| 768 | { |
| 769 | struct switch_stack *sw = (struct switch_stack *) &__unused; |
| 770 | struct pt_regs *regs = (struct pt_regs *) (sw + 1); |
| 771 | unsigned long usp = rdusp(); |
| 772 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); |
| 773 | sigset_t set; |
| 774 | |
| 775 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 776 | goto badframe; |
| 777 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 778 | goto badframe; |
| 779 | |
Matt Fleming | 43a3599 | 2012-05-11 10:57:59 +1000 | [diff] [blame] | 780 | set_current_blocked(&set); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 781 | |
| 782 | if (rt_restore_ucontext(regs, sw, &frame->uc)) |
| 783 | goto badframe; |
| 784 | return regs->d0; |
| 785 | |
| 786 | badframe: |
| 787 | force_sig(SIGSEGV, current); |
| 788 | return 0; |
| 789 | } |
| 790 | |
| 791 | static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, |
| 792 | unsigned long mask) |
| 793 | { |
| 794 | sc->sc_mask = mask; |
| 795 | sc->sc_usp = rdusp(); |
| 796 | sc->sc_d0 = regs->d0; |
| 797 | sc->sc_d1 = regs->d1; |
| 798 | sc->sc_a0 = regs->a0; |
| 799 | sc->sc_a1 = regs->a1; |
| 800 | sc->sc_sr = regs->sr; |
| 801 | sc->sc_pc = regs->pc; |
| 802 | sc->sc_formatvec = regs->format << 12 | regs->vector; |
| 803 | save_a5_state(sc, regs); |
| 804 | save_fpu_state(sc, regs); |
| 805 | } |
| 806 | |
| 807 | static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) |
| 808 | { |
| 809 | struct switch_stack *sw = (struct switch_stack *)regs - 1; |
| 810 | greg_t __user *gregs = uc->uc_mcontext.gregs; |
| 811 | int err = 0; |
| 812 | |
| 813 | err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); |
| 814 | err |= __put_user(regs->d0, &gregs[0]); |
| 815 | err |= __put_user(regs->d1, &gregs[1]); |
| 816 | err |= __put_user(regs->d2, &gregs[2]); |
| 817 | err |= __put_user(regs->d3, &gregs[3]); |
| 818 | err |= __put_user(regs->d4, &gregs[4]); |
| 819 | err |= __put_user(regs->d5, &gregs[5]); |
| 820 | err |= __put_user(sw->d6, &gregs[6]); |
| 821 | err |= __put_user(sw->d7, &gregs[7]); |
| 822 | err |= __put_user(regs->a0, &gregs[8]); |
| 823 | err |= __put_user(regs->a1, &gregs[9]); |
| 824 | err |= __put_user(regs->a2, &gregs[10]); |
| 825 | err |= __put_user(sw->a3, &gregs[11]); |
| 826 | err |= __put_user(sw->a4, &gregs[12]); |
| 827 | err |= __put_user(sw->a5, &gregs[13]); |
| 828 | err |= __put_user(sw->a6, &gregs[14]); |
| 829 | err |= __put_user(rdusp(), &gregs[15]); |
| 830 | err |= __put_user(regs->pc, &gregs[16]); |
| 831 | err |= __put_user(regs->sr, &gregs[17]); |
| 832 | err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); |
| 833 | err |= rt_save_fpu_state(uc, regs); |
| 834 | return err; |
| 835 | } |
| 836 | |
| 837 | static inline void __user * |
Richard Weinberger | 36992f2 | 2014-03-05 15:28:59 +0100 | [diff] [blame] | 838 | get_sigframe(struct ksignal *ksig, size_t frame_size) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 839 | { |
Richard Weinberger | 36992f2 | 2014-03-05 15:28:59 +0100 | [diff] [blame] | 840 | unsigned long usp = sigsp(rdusp(), ksig); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 841 | |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 842 | return (void __user *)((usp - frame_size) & -8UL); |
| 843 | } |
| 844 | |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 845 | static int setup_frame(struct ksignal *ksig, sigset_t *set, |
| 846 | struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 847 | { |
| 848 | struct sigframe __user *frame; |
| 849 | int fsize = frame_extra_sizes(regs->format); |
| 850 | struct sigcontext context; |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 851 | int err = 0, sig = ksig->sig; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 852 | |
| 853 | if (fsize < 0) { |
| 854 | #ifdef DEBUG |
| 855 | printk ("setup_frame: Unknown frame format %#x\n", |
| 856 | regs->format); |
| 857 | #endif |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 858 | return -EFAULT; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 859 | } |
| 860 | |
Richard Weinberger | 36992f2 | 2014-03-05 15:28:59 +0100 | [diff] [blame] | 861 | frame = get_sigframe(ksig, sizeof(*frame) + fsize); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 862 | |
| 863 | if (fsize) |
| 864 | err |= copy_to_user (frame + 1, regs + 1, fsize); |
| 865 | |
Richard Weinberger | a0075cd | 2014-07-13 17:19:34 +0200 | [diff] [blame] | 866 | err |= __put_user(sig, &frame->sig); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 867 | |
| 868 | err |= __put_user(regs->vector, &frame->code); |
| 869 | err |= __put_user(&frame->sc, &frame->psc); |
| 870 | |
| 871 | if (_NSIG_WORDS > 1) |
| 872 | err |= copy_to_user(frame->extramask, &set->sig[1], |
| 873 | sizeof(frame->extramask)); |
| 874 | |
| 875 | setup_sigcontext(&context, regs, set->sig[0]); |
| 876 | err |= copy_to_user (&frame->sc, &context, sizeof(context)); |
| 877 | |
| 878 | /* Set up to return from userspace. */ |
| 879 | #ifdef CONFIG_MMU |
| 880 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 881 | /* moveq #,d0; trap #0 */ |
| 882 | err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), |
| 883 | (long __user *)(frame->retcode)); |
| 884 | #else |
| 885 | err |= __put_user((void *) ret_from_user_signal, &frame->pretcode); |
| 886 | #endif |
| 887 | |
| 888 | if (err) |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 889 | return -EFAULT; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 890 | |
| 891 | push_cache ((unsigned long) &frame->retcode); |
| 892 | |
| 893 | /* |
| 894 | * Set up registers for signal handler. All the state we are about |
| 895 | * to destroy is successfully copied to sigframe. |
| 896 | */ |
| 897 | wrusp ((unsigned long) frame); |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 898 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 899 | adjustformat(regs); |
| 900 | |
| 901 | /* |
| 902 | * This is subtle; if we build more than one sigframe, all but the |
| 903 | * first one will see frame format 0 and have fsize == 0, so we won't |
| 904 | * screw stkadj. |
| 905 | */ |
| 906 | if (fsize) |
| 907 | regs->stkadj = fsize; |
| 908 | |
| 909 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 910 | if (regs->stkadj) { |
| 911 | struct pt_regs *tregs = |
| 912 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
| 913 | #ifdef DEBUG |
| 914 | printk("Performing stackadjust=%04x\n", regs->stkadj); |
| 915 | #endif |
| 916 | /* This must be copied with decreasing addresses to |
| 917 | handle overlaps. */ |
| 918 | tregs->vector = 0; |
| 919 | tregs->format = 0; |
| 920 | tregs->pc = regs->pc; |
| 921 | tregs->sr = regs->sr; |
| 922 | } |
| 923 | return 0; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 924 | } |
| 925 | |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 926 | static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, |
| 927 | struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 928 | { |
| 929 | struct rt_sigframe __user *frame; |
| 930 | int fsize = frame_extra_sizes(regs->format); |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 931 | int err = 0, sig = ksig->sig; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 932 | |
| 933 | if (fsize < 0) { |
| 934 | #ifdef DEBUG |
| 935 | printk ("setup_frame: Unknown frame format %#x\n", |
| 936 | regs->format); |
| 937 | #endif |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 938 | return -EFAULT; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 939 | } |
| 940 | |
Richard Weinberger | 36992f2 | 2014-03-05 15:28:59 +0100 | [diff] [blame] | 941 | frame = get_sigframe(ksig, sizeof(*frame)); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 942 | |
| 943 | if (fsize) |
| 944 | err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); |
| 945 | |
Richard Weinberger | a0075cd | 2014-07-13 17:19:34 +0200 | [diff] [blame] | 946 | err |= __put_user(sig, &frame->sig); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 947 | err |= __put_user(&frame->info, &frame->pinfo); |
| 948 | err |= __put_user(&frame->uc, &frame->puc); |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 949 | err |= copy_siginfo_to_user(&frame->info, &ksig->info); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 950 | |
| 951 | /* Create the ucontext. */ |
| 952 | err |= __put_user(0, &frame->uc.uc_flags); |
| 953 | err |= __put_user(NULL, &frame->uc.uc_link); |
Al Viro | 08d4f65 | 2012-12-23 03:06:03 -0500 | [diff] [blame] | 954 | err |= __save_altstack(&frame->uc.uc_stack, rdusp()); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 955 | err |= rt_setup_ucontext(&frame->uc, regs); |
| 956 | err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 957 | |
| 958 | /* Set up to return from userspace. */ |
| 959 | #ifdef CONFIG_MMU |
| 960 | err |= __put_user(frame->retcode, &frame->pretcode); |
| 961 | #ifdef __mcoldfire__ |
| 962 | /* movel #__NR_rt_sigreturn,d0; trap #0 */ |
| 963 | err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); |
| 964 | err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), |
| 965 | (long __user *)(frame->retcode + 4)); |
| 966 | #else |
| 967 | /* moveq #,d0; notb d0; trap #0 */ |
| 968 | err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), |
| 969 | (long __user *)(frame->retcode + 0)); |
| 970 | err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); |
| 971 | #endif |
| 972 | #else |
| 973 | err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode); |
| 974 | #endif /* CONFIG_MMU */ |
| 975 | |
| 976 | if (err) |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 977 | return -EFAULT; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 978 | |
| 979 | push_cache ((unsigned long) &frame->retcode); |
| 980 | |
| 981 | /* |
| 982 | * Set up registers for signal handler. All the state we are about |
| 983 | * to destroy is successfully copied to sigframe. |
| 984 | */ |
| 985 | wrusp ((unsigned long) frame); |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 986 | regs->pc = (unsigned long) ksig->ka.sa.sa_handler; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 987 | adjustformat(regs); |
| 988 | |
| 989 | /* |
| 990 | * This is subtle; if we build more than one sigframe, all but the |
| 991 | * first one will see frame format 0 and have fsize == 0, so we won't |
| 992 | * screw stkadj. |
| 993 | */ |
| 994 | if (fsize) |
| 995 | regs->stkadj = fsize; |
| 996 | |
| 997 | /* Prepare to skip over the extra stuff in the exception frame. */ |
| 998 | if (regs->stkadj) { |
| 999 | struct pt_regs *tregs = |
| 1000 | (struct pt_regs *)((ulong)regs + regs->stkadj); |
| 1001 | #ifdef DEBUG |
| 1002 | printk("Performing stackadjust=%04x\n", regs->stkadj); |
| 1003 | #endif |
| 1004 | /* This must be copied with decreasing addresses to |
| 1005 | handle overlaps. */ |
| 1006 | tregs->vector = 0; |
| 1007 | tregs->format = 0; |
| 1008 | tregs->pc = regs->pc; |
| 1009 | tregs->sr = regs->sr; |
| 1010 | } |
| 1011 | return 0; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1012 | } |
| 1013 | |
| 1014 | static inline void |
| 1015 | handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) |
| 1016 | { |
| 1017 | switch (regs->d0) { |
| 1018 | case -ERESTARTNOHAND: |
| 1019 | if (!has_handler) |
| 1020 | goto do_restart; |
| 1021 | regs->d0 = -EINTR; |
| 1022 | break; |
| 1023 | |
| 1024 | case -ERESTART_RESTARTBLOCK: |
| 1025 | if (!has_handler) { |
| 1026 | regs->d0 = __NR_restart_syscall; |
| 1027 | regs->pc -= 2; |
| 1028 | break; |
| 1029 | } |
| 1030 | regs->d0 = -EINTR; |
| 1031 | break; |
| 1032 | |
| 1033 | case -ERESTARTSYS: |
| 1034 | if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { |
| 1035 | regs->d0 = -EINTR; |
| 1036 | break; |
| 1037 | } |
| 1038 | /* fallthrough */ |
| 1039 | case -ERESTARTNOINTR: |
| 1040 | do_restart: |
| 1041 | regs->d0 = regs->orig_d0; |
| 1042 | regs->pc -= 2; |
| 1043 | break; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | /* |
| 1048 | * OK, we're invoking a handler |
| 1049 | */ |
| 1050 | static void |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1051 | handle_signal(struct ksignal *ksig, struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1052 | { |
Al Viro | b7f9a11 | 2012-05-02 09:59:21 -0400 | [diff] [blame] | 1053 | sigset_t *oldset = sigmask_to_save(); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1054 | int err; |
| 1055 | /* are we from a system call? */ |
| 1056 | if (regs->orig_d0 >= 0) |
| 1057 | /* If so, check system call restarting.. */ |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1058 | handle_restart(regs, &ksig->ka, 1); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1059 | |
| 1060 | /* set up the stack frame */ |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1061 | if (ksig->ka.sa.sa_flags & SA_SIGINFO) |
| 1062 | err = setup_rt_frame(ksig, oldset, regs); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1063 | else |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1064 | err = setup_frame(ksig, oldset, regs); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1065 | |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1066 | signal_setup_done(err, ksig, 0); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1067 | |
| 1068 | if (test_thread_flag(TIF_DELAYED_TRACE)) { |
| 1069 | regs->sr &= ~0x8000; |
| 1070 | send_sig(SIGTRAP, current, 1); |
| 1071 | } |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 1076 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 1077 | * mistake. |
| 1078 | */ |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1079 | static void do_signal(struct pt_regs *regs) |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1080 | { |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1081 | struct ksignal ksig; |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1082 | |
| 1083 | current->thread.esp0 = (unsigned long) regs; |
| 1084 | |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1085 | if (get_signal(&ksig)) { |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1086 | /* Whee! Actually deliver the signal. */ |
Richard Weinberger | 0d97500 | 2013-10-07 22:55:48 +0200 | [diff] [blame] | 1087 | handle_signal(&ksig, regs); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1088 | return; |
| 1089 | } |
| 1090 | |
| 1091 | /* Did we come from a system call? */ |
| 1092 | if (regs->orig_d0 >= 0) |
| 1093 | /* Restart the system call - no handlers present */ |
| 1094 | handle_restart(regs, NULL, 0); |
| 1095 | |
| 1096 | /* 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] | 1097 | restore_saved_sigmask(); |
Greg Ungerer | 0c22faf | 2012-03-14 13:22:25 +1000 | [diff] [blame] | 1098 | } |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1099 | |
| 1100 | void do_notify_resume(struct pt_regs *regs) |
| 1101 | { |
| 1102 | if (test_thread_flag(TIF_SIGPENDING)) |
| 1103 | do_signal(regs); |
| 1104 | |
Al Viro | a42c6de | 2012-05-23 14:44:37 -0400 | [diff] [blame] | 1105 | if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1106 | tracehook_notify_resume(regs); |
Al Viro | a54f165 | 2012-04-24 01:46:23 -0400 | [diff] [blame] | 1107 | } |