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> 46 #include <linux/tracehook.h> 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 54 #ifdef CONFIG_MMU 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 62 #else 63 #define FORMAT 0 64 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4) 65 #endif 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 { 232 sigset_t blocked; 233 siginitset(&blocked, mask); 234 return sigsuspend(&blocked); 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; 795 796 set_current_blocked(&set); 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; 819 820 set_current_blocked(&set); 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, 1122 struct pt_regs *regs) 1123 { 1124 sigset_t *oldset = sigmask_to_save(); 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 1140 signal_delivered(sig, info, ka, regs, 0); 1141 1142 if (test_thread_flag(TIF_DELAYED_TRACE)) { 1143 regs->sr &= ~0x8000; 1144 send_sig(SIGTRAP, current, 1); 1145 } 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 */ 1153 static void do_signal(struct pt_regs *regs) 1154 { 1155 siginfo_t info; 1156 struct k_sigaction ka; 1157 int signr; 1158 1159 current->thread.esp0 = (unsigned long) regs; 1160 1161 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 1162 if (signr > 0) { 1163 /* Whee! Actually deliver the signal. */ 1164 handle_signal(signr, &ka, &info, regs); 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. */ 1174 restore_saved_sigmask(); 1175 } 1176 1177 void do_notify_resume(struct pt_regs *regs) 1178 { 1179 if (test_thread_flag(TIF_SIGPENDING)) 1180 do_signal(regs); 1181 1182 if (test_and_clear_thread_flag(TIF_NOTIFY_RESUME)) 1183 tracehook_notify_resume(regs); 1184 } 1185