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 47 #include <asm/setup.h> 48 #include <asm/uaccess.h> 49 #include <asm/pgtable.h> 50 #include <asm/traps.h> 51 #include <asm/ucontext.h> 52 53 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 54 55 #ifdef CONFIG_MMU 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 63 #else 64 #define FORMAT 0 65 #define FMT4SIZE sizeof(((struct frame *)0)->un.fmt4) 66 #endif 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 } 111 112 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) 113 { 114 if (regs->orig_d0 < 0) 115 return; 116 switch (regs->d0) { 117 case -ERESTARTNOHAND: 118 case -ERESTARTSYS: 119 case -ERESTARTNOINTR: 120 regs->d0 = regs->orig_d0; 121 regs->orig_d0 = -1; 122 regs->pc -= 2; 123 break; 124 } 125 } 126 127 static inline void push_cache (unsigned long vaddr) 128 { 129 /* 130 * Using the old cache_push_v() was really a big waste. 131 * 132 * What we are trying to do is to flush 8 bytes to ram. 133 * Flushing 2 cache lines of 16 bytes is much cheaper than 134 * flushing 1 or 2 pages, as previously done in 135 * cache_push_v(). 136 * Jes 137 */ 138 if (CPU_IS_040) { 139 unsigned long temp; 140 141 __asm__ __volatile__ (".chip 68040\n\t" 142 "nop\n\t" 143 "ptestr (%1)\n\t" 144 "movec %%mmusr,%0\n\t" 145 ".chip 68k" 146 : "=r" (temp) 147 : "a" (vaddr)); 148 149 temp &= PAGE_MASK; 150 temp |= vaddr & ~PAGE_MASK; 151 152 __asm__ __volatile__ (".chip 68040\n\t" 153 "nop\n\t" 154 "cpushl %%bc,(%0)\n\t" 155 ".chip 68k" 156 : : "a" (temp)); 157 } 158 else if (CPU_IS_060) { 159 unsigned long temp; 160 __asm__ __volatile__ (".chip 68060\n\t" 161 "plpar (%0)\n\t" 162 ".chip 68k" 163 : "=a" (temp) 164 : "0" (vaddr)); 165 __asm__ __volatile__ (".chip 68060\n\t" 166 "cpushl %%bc,(%0)\n\t" 167 ".chip 68k" 168 : : "a" (temp)); 169 } else if (!CPU_IS_COLDFIRE) { 170 /* 171 * 68030/68020 have no writeback cache; 172 * still need to clear icache. 173 * Note that vaddr is guaranteed to be long word aligned. 174 */ 175 unsigned long temp; 176 asm volatile ("movec %%cacr,%0" : "=r" (temp)); 177 temp += 4; 178 asm volatile ("movec %0,%%caar\n\t" 179 "movec %1,%%cacr" 180 : : "r" (vaddr), "r" (temp)); 181 asm volatile ("movec %0,%%caar\n\t" 182 "movec %1,%%cacr" 183 : : "r" (vaddr + 4), "r" (temp)); 184 } 185 } 186 187 static inline void adjustformat(struct pt_regs *regs) 188 { 189 } 190 191 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) 192 { 193 } 194 195 #else /* CONFIG_MMU */ 196 197 void ret_from_user_signal(void); 198 void ret_from_user_rt_signal(void); 199 200 static inline int frame_extra_sizes(int f) 201 { 202 /* No frame size adjustments required on non-MMU CPUs */ 203 return 0; 204 } 205 206 static inline void adjustformat(struct pt_regs *regs) 207 { 208 ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data; 209 /* 210 * set format byte to make stack appear modulo 4, which it will 211 * be when doing the rte 212 */ 213 regs->format = 0x4; 214 } 215 216 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) 217 { 218 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; 219 } 220 221 static inline void push_cache(unsigned long vaddr) 222 { 223 } 224 225 #endif /* CONFIG_MMU */ 226 227 /* 228 * Atomically swap in the new signal mask, and wait for a signal. 229 */ 230 asmlinkage int 231 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask) 232 { 233 mask &= _BLOCKABLE; 234 spin_lock_irq(¤t->sighand->siglock); 235 current->saved_sigmask = current->blocked; 236 siginitset(¤t->blocked, mask); 237 recalc_sigpending(); 238 spin_unlock_irq(¤t->sighand->siglock); 239 240 current->state = TASK_INTERRUPTIBLE; 241 schedule(); 242 set_restore_sigmask(); 243 244 return -ERESTARTNOHAND; 245 } 246 247 asmlinkage int 248 sys_sigaction(int sig, const struct old_sigaction __user *act, 249 struct old_sigaction __user *oact) 250 { 251 struct k_sigaction new_ka, old_ka; 252 int ret; 253 254 if (act) { 255 old_sigset_t mask; 256 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 257 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 258 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || 259 __get_user(new_ka.sa.sa_flags, &act->sa_flags) || 260 __get_user(mask, &act->sa_mask)) 261 return -EFAULT; 262 siginitset(&new_ka.sa.sa_mask, mask); 263 } 264 265 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 266 267 if (!ret && oact) { 268 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 269 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 270 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || 271 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || 272 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) 273 return -EFAULT; 274 } 275 276 return ret; 277 } 278 279 asmlinkage int 280 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) 281 { 282 return do_sigaltstack(uss, uoss, rdusp()); 283 } 284 285 286 /* 287 * Do a signal return; undo the signal stack. 288 * 289 * Keep the return code on the stack quadword aligned! 290 * That makes the cache flush below easier. 291 */ 292 293 struct sigframe 294 { 295 char __user *pretcode; 296 int sig; 297 int code; 298 struct sigcontext __user *psc; 299 char retcode[8]; 300 unsigned long extramask[_NSIG_WORDS-1]; 301 struct sigcontext sc; 302 }; 303 304 struct rt_sigframe 305 { 306 char __user *pretcode; 307 int sig; 308 struct siginfo __user *pinfo; 309 void __user *puc; 310 char retcode[8]; 311 struct siginfo info; 312 struct ucontext uc; 313 }; 314 315 #define FPCONTEXT_SIZE 216 316 #define uc_fpstate uc_filler[0] 317 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] 318 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] 319 320 #ifdef CONFIG_FPU 321 322 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ 323 324 static inline int restore_fpu_state(struct sigcontext *sc) 325 { 326 int err = 1; 327 328 if (FPU_IS_EMU) { 329 /* restore registers */ 330 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); 331 memcpy(current->thread.fp, sc->sc_fpregs, 24); 332 return 0; 333 } 334 335 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 336 /* Verify the frame format. */ 337 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && 338 (sc->sc_fpstate[0] != fpu_version)) 339 goto out; 340 if (CPU_IS_020_OR_030) { 341 if (m68k_fputype & FPU_68881 && 342 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) 343 goto out; 344 if (m68k_fputype & FPU_68882 && 345 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) 346 goto out; 347 } else if (CPU_IS_040) { 348 if (!(sc->sc_fpstate[1] == 0x00 || 349 sc->sc_fpstate[1] == 0x28 || 350 sc->sc_fpstate[1] == 0x60)) 351 goto out; 352 } else if (CPU_IS_060) { 353 if (!(sc->sc_fpstate[3] == 0x00 || 354 sc->sc_fpstate[3] == 0x60 || 355 sc->sc_fpstate[3] == 0xe0)) 356 goto out; 357 } else if (CPU_IS_COLDFIRE) { 358 if (!(sc->sc_fpstate[0] == 0x00 || 359 sc->sc_fpstate[0] == 0x05 || 360 sc->sc_fpstate[0] == 0xe5)) 361 goto out; 362 } else 363 goto out; 364 365 if (CPU_IS_COLDFIRE) { 366 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" 367 "fmovel %1,%%fpcr\n\t" 368 "fmovel %2,%%fpsr\n\t" 369 "fmovel %3,%%fpiar" 370 : /* no outputs */ 371 : "m" (sc->sc_fpregs[0]), 372 "m" (sc->sc_fpcntl[0]), 373 "m" (sc->sc_fpcntl[1]), 374 "m" (sc->sc_fpcntl[2])); 375 } else { 376 __asm__ volatile (".chip 68k/68881\n\t" 377 "fmovemx %0,%%fp0-%%fp1\n\t" 378 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 379 ".chip 68k" 380 : /* no outputs */ 381 : "m" (*sc->sc_fpregs), 382 "m" (*sc->sc_fpcntl)); 383 } 384 } 385 386 if (CPU_IS_COLDFIRE) { 387 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); 388 } else { 389 __asm__ volatile (".chip 68k/68881\n\t" 390 "frestore %0\n\t" 391 ".chip 68k" 392 : : "m" (*sc->sc_fpstate)); 393 } 394 err = 0; 395 396 out: 397 return err; 398 } 399 400 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 401 { 402 unsigned char fpstate[FPCONTEXT_SIZE]; 403 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); 404 fpregset_t fpregs; 405 int err = 1; 406 407 if (FPU_IS_EMU) { 408 /* restore fpu control register */ 409 if (__copy_from_user(current->thread.fpcntl, 410 uc->uc_mcontext.fpregs.f_fpcntl, 12)) 411 goto out; 412 /* restore all other fpu register */ 413 if (__copy_from_user(current->thread.fp, 414 uc->uc_mcontext.fpregs.f_fpregs, 96)) 415 goto out; 416 return 0; 417 } 418 419 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) 420 goto out; 421 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 422 if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) 423 context_size = fpstate[1]; 424 /* Verify the frame format. */ 425 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && 426 (fpstate[0] != fpu_version)) 427 goto out; 428 if (CPU_IS_020_OR_030) { 429 if (m68k_fputype & FPU_68881 && 430 !(context_size == 0x18 || context_size == 0xb4)) 431 goto out; 432 if (m68k_fputype & FPU_68882 && 433 !(context_size == 0x38 || context_size == 0xd4)) 434 goto out; 435 } else if (CPU_IS_040) { 436 if (!(context_size == 0x00 || 437 context_size == 0x28 || 438 context_size == 0x60)) 439 goto out; 440 } else if (CPU_IS_060) { 441 if (!(fpstate[3] == 0x00 || 442 fpstate[3] == 0x60 || 443 fpstate[3] == 0xe0)) 444 goto out; 445 } else if (CPU_IS_COLDFIRE) { 446 if (!(fpstate[3] == 0x00 || 447 fpstate[3] == 0x05 || 448 fpstate[3] == 0xe5)) 449 goto out; 450 } else 451 goto out; 452 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, 453 sizeof(fpregs))) 454 goto out; 455 456 if (CPU_IS_COLDFIRE) { 457 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" 458 "fmovel %1,%%fpcr\n\t" 459 "fmovel %2,%%fpsr\n\t" 460 "fmovel %3,%%fpiar" 461 : /* no outputs */ 462 : "m" (fpregs.f_fpregs[0]), 463 "m" (fpregs.f_fpcntl[0]), 464 "m" (fpregs.f_fpcntl[1]), 465 "m" (fpregs.f_fpcntl[2])); 466 } else { 467 __asm__ volatile (".chip 68k/68881\n\t" 468 "fmovemx %0,%%fp0-%%fp7\n\t" 469 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 470 ".chip 68k" 471 : /* no outputs */ 472 : "m" (*fpregs.f_fpregs), 473 "m" (*fpregs.f_fpcntl)); 474 } 475 } 476 if (context_size && 477 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, 478 context_size)) 479 goto out; 480 481 if (CPU_IS_COLDFIRE) { 482 __asm__ volatile ("frestore %0" : : "m" (*fpstate)); 483 } else { 484 __asm__ volatile (".chip 68k/68881\n\t" 485 "frestore %0\n\t" 486 ".chip 68k" 487 : : "m" (*fpstate)); 488 } 489 err = 0; 490 491 out: 492 return err; 493 } 494 495 /* 496 * Set up a signal frame. 497 */ 498 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 499 { 500 if (FPU_IS_EMU) { 501 /* save registers */ 502 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); 503 memcpy(sc->sc_fpregs, current->thread.fp, 24); 504 return; 505 } 506 507 if (CPU_IS_COLDFIRE) { 508 __asm__ volatile ("fsave %0" 509 : : "m" (*sc->sc_fpstate) : "memory"); 510 } else { 511 __asm__ volatile (".chip 68k/68881\n\t" 512 "fsave %0\n\t" 513 ".chip 68k" 514 : : "m" (*sc->sc_fpstate) : "memory"); 515 } 516 517 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 518 fpu_version = sc->sc_fpstate[0]; 519 if (CPU_IS_020_OR_030 && 520 regs->vector >= (VEC_FPBRUC * 4) && 521 regs->vector <= (VEC_FPNAN * 4)) { 522 /* Clear pending exception in 68882 idle frame */ 523 if (*(unsigned short *) sc->sc_fpstate == 0x1f38) 524 sc->sc_fpstate[0x38] |= 1 << 3; 525 } 526 527 if (CPU_IS_COLDFIRE) { 528 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" 529 "fmovel %%fpcr,%1\n\t" 530 "fmovel %%fpsr,%2\n\t" 531 "fmovel %%fpiar,%3" 532 : "=m" (sc->sc_fpregs[0]), 533 "=m" (sc->sc_fpcntl[0]), 534 "=m" (sc->sc_fpcntl[1]), 535 "=m" (sc->sc_fpcntl[2]) 536 : /* no inputs */ 537 : "memory"); 538 } else { 539 __asm__ volatile (".chip 68k/68881\n\t" 540 "fmovemx %%fp0-%%fp1,%0\n\t" 541 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 542 ".chip 68k" 543 : "=m" (*sc->sc_fpregs), 544 "=m" (*sc->sc_fpcntl) 545 : /* no inputs */ 546 : "memory"); 547 } 548 } 549 } 550 551 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 552 { 553 unsigned char fpstate[FPCONTEXT_SIZE]; 554 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); 555 int err = 0; 556 557 if (FPU_IS_EMU) { 558 /* save fpu control register */ 559 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, 560 current->thread.fpcntl, 12); 561 /* save all other fpu register */ 562 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, 563 current->thread.fp, 96); 564 return err; 565 } 566 567 if (CPU_IS_COLDFIRE) { 568 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); 569 } else { 570 __asm__ volatile (".chip 68k/68881\n\t" 571 "fsave %0\n\t" 572 ".chip 68k" 573 : : "m" (*fpstate) : "memory"); 574 } 575 576 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); 577 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 578 fpregset_t fpregs; 579 if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) 580 context_size = fpstate[1]; 581 fpu_version = fpstate[0]; 582 if (CPU_IS_020_OR_030 && 583 regs->vector >= (VEC_FPBRUC * 4) && 584 regs->vector <= (VEC_FPNAN * 4)) { 585 /* Clear pending exception in 68882 idle frame */ 586 if (*(unsigned short *) fpstate == 0x1f38) 587 fpstate[0x38] |= 1 << 3; 588 } 589 if (CPU_IS_COLDFIRE) { 590 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" 591 "fmovel %%fpcr,%1\n\t" 592 "fmovel %%fpsr,%2\n\t" 593 "fmovel %%fpiar,%3" 594 : "=m" (fpregs.f_fpregs[0]), 595 "=m" (fpregs.f_fpcntl[0]), 596 "=m" (fpregs.f_fpcntl[1]), 597 "=m" (fpregs.f_fpcntl[2]) 598 : /* no inputs */ 599 : "memory"); 600 } else { 601 __asm__ volatile (".chip 68k/68881\n\t" 602 "fmovemx %%fp0-%%fp7,%0\n\t" 603 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 604 ".chip 68k" 605 : "=m" (*fpregs.f_fpregs), 606 "=m" (*fpregs.f_fpcntl) 607 : /* no inputs */ 608 : "memory"); 609 } 610 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, 611 sizeof(fpregs)); 612 } 613 if (context_size) 614 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, 615 context_size); 616 return err; 617 } 618 619 #else /* CONFIG_FPU */ 620 621 /* 622 * For the case with no FPU configured these all do nothing. 623 */ 624 static inline int restore_fpu_state(struct sigcontext *sc) 625 { 626 return 0; 627 } 628 629 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 630 { 631 return 0; 632 } 633 634 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 635 { 636 } 637 638 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 639 { 640 return 0; 641 } 642 643 #endif /* CONFIG_FPU */ 644 645 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, 646 void __user *fp) 647 { 648 int fsize = frame_extra_sizes(formatvec >> 12); 649 if (fsize < 0) { 650 /* 651 * user process trying to return with weird frame format 652 */ 653 #ifdef DEBUG 654 printk("user process returning with weird frame format\n"); 655 #endif 656 return 1; 657 } 658 if (!fsize) { 659 regs->format = formatvec >> 12; 660 regs->vector = formatvec & 0xfff; 661 } else { 662 struct switch_stack *sw = (struct switch_stack *)regs - 1; 663 unsigned long buf[fsize / 2]; /* yes, twice as much */ 664 665 /* that'll make sure that expansion won't crap over data */ 666 if (copy_from_user(buf + fsize / 4, fp, fsize)) 667 return 1; 668 669 /* point of no return */ 670 regs->format = formatvec >> 12; 671 regs->vector = formatvec & 0xfff; 672 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) 673 __asm__ __volatile__ ( 674 #ifdef CONFIG_COLDFIRE 675 " movel %0,%/sp\n\t" 676 " bra ret_from_signal\n" 677 #else 678 " movel %0,%/a0\n\t" 679 " subl %1,%/a0\n\t" /* make room on stack */ 680 " movel %/a0,%/sp\n\t" /* set stack pointer */ 681 /* move switch_stack and pt_regs */ 682 "1: movel %0@+,%/a0@+\n\t" 683 " dbra %2,1b\n\t" 684 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ 685 " lsrl #2,%1\n\t" 686 " subql #1,%1\n\t" 687 /* copy to the gap we'd made */ 688 "2: movel %4@+,%/a0@+\n\t" 689 " dbra %1,2b\n\t" 690 " bral ret_from_signal\n" 691 #endif 692 : /* no outputs, it doesn't ever return */ 693 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), 694 "n" (frame_offset), "a" (buf + fsize/4) 695 : "a0"); 696 #undef frame_offset 697 } 698 return 0; 699 } 700 701 static inline int 702 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) 703 { 704 int formatvec; 705 struct sigcontext context; 706 int err = 0; 707 708 /* Always make any pending restarted system calls return -EINTR */ 709 current_thread_info()->restart_block.fn = do_no_restart_syscall; 710 711 /* get previous context */ 712 if (copy_from_user(&context, usc, sizeof(context))) 713 goto badframe; 714 715 /* restore passed registers */ 716 regs->d0 = context.sc_d0; 717 regs->d1 = context.sc_d1; 718 regs->a0 = context.sc_a0; 719 regs->a1 = context.sc_a1; 720 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); 721 regs->pc = context.sc_pc; 722 regs->orig_d0 = -1; /* disable syscall checks */ 723 wrusp(context.sc_usp); 724 formatvec = context.sc_formatvec; 725 726 err = restore_fpu_state(&context); 727 728 if (err || mangle_kernel_stack(regs, formatvec, fp)) 729 goto badframe; 730 731 return 0; 732 733 badframe: 734 return 1; 735 } 736 737 static inline int 738 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, 739 struct ucontext __user *uc) 740 { 741 int temp; 742 greg_t __user *gregs = uc->uc_mcontext.gregs; 743 unsigned long usp; 744 int err; 745 746 /* Always make any pending restarted system calls return -EINTR */ 747 current_thread_info()->restart_block.fn = do_no_restart_syscall; 748 749 err = __get_user(temp, &uc->uc_mcontext.version); 750 if (temp != MCONTEXT_VERSION) 751 goto badframe; 752 /* restore passed registers */ 753 err |= __get_user(regs->d0, &gregs[0]); 754 err |= __get_user(regs->d1, &gregs[1]); 755 err |= __get_user(regs->d2, &gregs[2]); 756 err |= __get_user(regs->d3, &gregs[3]); 757 err |= __get_user(regs->d4, &gregs[4]); 758 err |= __get_user(regs->d5, &gregs[5]); 759 err |= __get_user(sw->d6, &gregs[6]); 760 err |= __get_user(sw->d7, &gregs[7]); 761 err |= __get_user(regs->a0, &gregs[8]); 762 err |= __get_user(regs->a1, &gregs[9]); 763 err |= __get_user(regs->a2, &gregs[10]); 764 err |= __get_user(sw->a3, &gregs[11]); 765 err |= __get_user(sw->a4, &gregs[12]); 766 err |= __get_user(sw->a5, &gregs[13]); 767 err |= __get_user(sw->a6, &gregs[14]); 768 err |= __get_user(usp, &gregs[15]); 769 wrusp(usp); 770 err |= __get_user(regs->pc, &gregs[16]); 771 err |= __get_user(temp, &gregs[17]); 772 regs->sr = (regs->sr & 0xff00) | (temp & 0xff); 773 regs->orig_d0 = -1; /* disable syscall checks */ 774 err |= __get_user(temp, &uc->uc_formatvec); 775 776 err |= rt_restore_fpu_state(uc); 777 778 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) 779 goto badframe; 780 781 if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) 782 goto badframe; 783 784 return 0; 785 786 badframe: 787 return 1; 788 } 789 790 asmlinkage int do_sigreturn(unsigned long __unused) 791 { 792 struct switch_stack *sw = (struct switch_stack *) &__unused; 793 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 794 unsigned long usp = rdusp(); 795 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); 796 sigset_t set; 797 798 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 799 goto badframe; 800 if (__get_user(set.sig[0], &frame->sc.sc_mask) || 801 (_NSIG_WORDS > 1 && 802 __copy_from_user(&set.sig[1], &frame->extramask, 803 sizeof(frame->extramask)))) 804 goto badframe; 805 806 sigdelsetmask(&set, ~_BLOCKABLE); 807 current->blocked = set; 808 recalc_sigpending(); 809 810 if (restore_sigcontext(regs, &frame->sc, frame + 1)) 811 goto badframe; 812 return regs->d0; 813 814 badframe: 815 force_sig(SIGSEGV, current); 816 return 0; 817 } 818 819 asmlinkage int do_rt_sigreturn(unsigned long __unused) 820 { 821 struct switch_stack *sw = (struct switch_stack *) &__unused; 822 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 823 unsigned long usp = rdusp(); 824 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); 825 sigset_t set; 826 827 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 828 goto badframe; 829 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 830 goto badframe; 831 832 sigdelsetmask(&set, ~_BLOCKABLE); 833 current->blocked = set; 834 recalc_sigpending(); 835 836 if (rt_restore_ucontext(regs, sw, &frame->uc)) 837 goto badframe; 838 return regs->d0; 839 840 badframe: 841 force_sig(SIGSEGV, current); 842 return 0; 843 } 844 845 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, 846 unsigned long mask) 847 { 848 sc->sc_mask = mask; 849 sc->sc_usp = rdusp(); 850 sc->sc_d0 = regs->d0; 851 sc->sc_d1 = regs->d1; 852 sc->sc_a0 = regs->a0; 853 sc->sc_a1 = regs->a1; 854 sc->sc_sr = regs->sr; 855 sc->sc_pc = regs->pc; 856 sc->sc_formatvec = regs->format << 12 | regs->vector; 857 save_a5_state(sc, regs); 858 save_fpu_state(sc, regs); 859 } 860 861 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) 862 { 863 struct switch_stack *sw = (struct switch_stack *)regs - 1; 864 greg_t __user *gregs = uc->uc_mcontext.gregs; 865 int err = 0; 866 867 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); 868 err |= __put_user(regs->d0, &gregs[0]); 869 err |= __put_user(regs->d1, &gregs[1]); 870 err |= __put_user(regs->d2, &gregs[2]); 871 err |= __put_user(regs->d3, &gregs[3]); 872 err |= __put_user(regs->d4, &gregs[4]); 873 err |= __put_user(regs->d5, &gregs[5]); 874 err |= __put_user(sw->d6, &gregs[6]); 875 err |= __put_user(sw->d7, &gregs[7]); 876 err |= __put_user(regs->a0, &gregs[8]); 877 err |= __put_user(regs->a1, &gregs[9]); 878 err |= __put_user(regs->a2, &gregs[10]); 879 err |= __put_user(sw->a3, &gregs[11]); 880 err |= __put_user(sw->a4, &gregs[12]); 881 err |= __put_user(sw->a5, &gregs[13]); 882 err |= __put_user(sw->a6, &gregs[14]); 883 err |= __put_user(rdusp(), &gregs[15]); 884 err |= __put_user(regs->pc, &gregs[16]); 885 err |= __put_user(regs->sr, &gregs[17]); 886 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); 887 err |= rt_save_fpu_state(uc, regs); 888 return err; 889 } 890 891 static inline void __user * 892 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 893 { 894 unsigned long usp; 895 896 /* Default to using normal stack. */ 897 usp = rdusp(); 898 899 /* This is the X/Open sanctioned signal stack switching. */ 900 if (ka->sa.sa_flags & SA_ONSTACK) { 901 if (!sas_ss_flags(usp)) 902 usp = current->sas_ss_sp + current->sas_ss_size; 903 } 904 return (void __user *)((usp - frame_size) & -8UL); 905 } 906 907 static int setup_frame (int sig, struct k_sigaction *ka, 908 sigset_t *set, struct pt_regs *regs) 909 { 910 struct sigframe __user *frame; 911 int fsize = frame_extra_sizes(regs->format); 912 struct sigcontext context; 913 int err = 0; 914 915 if (fsize < 0) { 916 #ifdef DEBUG 917 printk ("setup_frame: Unknown frame format %#x\n", 918 regs->format); 919 #endif 920 goto give_sigsegv; 921 } 922 923 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); 924 925 if (fsize) 926 err |= copy_to_user (frame + 1, regs + 1, fsize); 927 928 err |= __put_user((current_thread_info()->exec_domain 929 && current_thread_info()->exec_domain->signal_invmap 930 && sig < 32 931 ? current_thread_info()->exec_domain->signal_invmap[sig] 932 : sig), 933 &frame->sig); 934 935 err |= __put_user(regs->vector, &frame->code); 936 err |= __put_user(&frame->sc, &frame->psc); 937 938 if (_NSIG_WORDS > 1) 939 err |= copy_to_user(frame->extramask, &set->sig[1], 940 sizeof(frame->extramask)); 941 942 setup_sigcontext(&context, regs, set->sig[0]); 943 err |= copy_to_user (&frame->sc, &context, sizeof(context)); 944 945 /* Set up to return from userspace. */ 946 #ifdef CONFIG_MMU 947 err |= __put_user(frame->retcode, &frame->pretcode); 948 /* moveq #,d0; trap #0 */ 949 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), 950 (long __user *)(frame->retcode)); 951 #else 952 err |= __put_user((void *) ret_from_user_signal, &frame->pretcode); 953 #endif 954 955 if (err) 956 goto give_sigsegv; 957 958 push_cache ((unsigned long) &frame->retcode); 959 960 /* 961 * Set up registers for signal handler. All the state we are about 962 * to destroy is successfully copied to sigframe. 963 */ 964 wrusp ((unsigned long) frame); 965 regs->pc = (unsigned long) ka->sa.sa_handler; 966 adjustformat(regs); 967 968 /* 969 * This is subtle; if we build more than one sigframe, all but the 970 * first one will see frame format 0 and have fsize == 0, so we won't 971 * screw stkadj. 972 */ 973 if (fsize) 974 regs->stkadj = fsize; 975 976 /* Prepare to skip over the extra stuff in the exception frame. */ 977 if (regs->stkadj) { 978 struct pt_regs *tregs = 979 (struct pt_regs *)((ulong)regs + regs->stkadj); 980 #ifdef DEBUG 981 printk("Performing stackadjust=%04x\n", regs->stkadj); 982 #endif 983 /* This must be copied with decreasing addresses to 984 handle overlaps. */ 985 tregs->vector = 0; 986 tregs->format = 0; 987 tregs->pc = regs->pc; 988 tregs->sr = regs->sr; 989 } 990 return 0; 991 992 give_sigsegv: 993 force_sigsegv(sig, current); 994 return err; 995 } 996 997 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, 998 sigset_t *set, struct pt_regs *regs) 999 { 1000 struct rt_sigframe __user *frame; 1001 int fsize = frame_extra_sizes(regs->format); 1002 int err = 0; 1003 1004 if (fsize < 0) { 1005 #ifdef DEBUG 1006 printk ("setup_frame: Unknown frame format %#x\n", 1007 regs->format); 1008 #endif 1009 goto give_sigsegv; 1010 } 1011 1012 frame = get_sigframe(ka, regs, sizeof(*frame)); 1013 1014 if (fsize) 1015 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); 1016 1017 err |= __put_user((current_thread_info()->exec_domain 1018 && current_thread_info()->exec_domain->signal_invmap 1019 && sig < 32 1020 ? current_thread_info()->exec_domain->signal_invmap[sig] 1021 : sig), 1022 &frame->sig); 1023 err |= __put_user(&frame->info, &frame->pinfo); 1024 err |= __put_user(&frame->uc, &frame->puc); 1025 err |= copy_siginfo_to_user(&frame->info, info); 1026 1027 /* Create the ucontext. */ 1028 err |= __put_user(0, &frame->uc.uc_flags); 1029 err |= __put_user(NULL, &frame->uc.uc_link); 1030 err |= __put_user((void __user *)current->sas_ss_sp, 1031 &frame->uc.uc_stack.ss_sp); 1032 err |= __put_user(sas_ss_flags(rdusp()), 1033 &frame->uc.uc_stack.ss_flags); 1034 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); 1035 err |= rt_setup_ucontext(&frame->uc, regs); 1036 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); 1037 1038 /* Set up to return from userspace. */ 1039 #ifdef CONFIG_MMU 1040 err |= __put_user(frame->retcode, &frame->pretcode); 1041 #ifdef __mcoldfire__ 1042 /* movel #__NR_rt_sigreturn,d0; trap #0 */ 1043 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); 1044 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), 1045 (long __user *)(frame->retcode + 4)); 1046 #else 1047 /* moveq #,d0; notb d0; trap #0 */ 1048 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), 1049 (long __user *)(frame->retcode + 0)); 1050 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); 1051 #endif 1052 #else 1053 err |= __put_user((void *) ret_from_user_rt_signal, &frame->pretcode); 1054 #endif /* CONFIG_MMU */ 1055 1056 if (err) 1057 goto give_sigsegv; 1058 1059 push_cache ((unsigned long) &frame->retcode); 1060 1061 /* 1062 * Set up registers for signal handler. All the state we are about 1063 * to destroy is successfully copied to sigframe. 1064 */ 1065 wrusp ((unsigned long) frame); 1066 regs->pc = (unsigned long) ka->sa.sa_handler; 1067 adjustformat(regs); 1068 1069 /* 1070 * This is subtle; if we build more than one sigframe, all but the 1071 * first one will see frame format 0 and have fsize == 0, so we won't 1072 * screw stkadj. 1073 */ 1074 if (fsize) 1075 regs->stkadj = fsize; 1076 1077 /* Prepare to skip over the extra stuff in the exception frame. */ 1078 if (regs->stkadj) { 1079 struct pt_regs *tregs = 1080 (struct pt_regs *)((ulong)regs + regs->stkadj); 1081 #ifdef DEBUG 1082 printk("Performing stackadjust=%04x\n", regs->stkadj); 1083 #endif 1084 /* This must be copied with decreasing addresses to 1085 handle overlaps. */ 1086 tregs->vector = 0; 1087 tregs->format = 0; 1088 tregs->pc = regs->pc; 1089 tregs->sr = regs->sr; 1090 } 1091 return 0; 1092 1093 give_sigsegv: 1094 force_sigsegv(sig, current); 1095 return err; 1096 } 1097 1098 static inline void 1099 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) 1100 { 1101 switch (regs->d0) { 1102 case -ERESTARTNOHAND: 1103 if (!has_handler) 1104 goto do_restart; 1105 regs->d0 = -EINTR; 1106 break; 1107 1108 case -ERESTART_RESTARTBLOCK: 1109 if (!has_handler) { 1110 regs->d0 = __NR_restart_syscall; 1111 regs->pc -= 2; 1112 break; 1113 } 1114 regs->d0 = -EINTR; 1115 break; 1116 1117 case -ERESTARTSYS: 1118 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { 1119 regs->d0 = -EINTR; 1120 break; 1121 } 1122 /* fallthrough */ 1123 case -ERESTARTNOINTR: 1124 do_restart: 1125 regs->d0 = regs->orig_d0; 1126 regs->pc -= 2; 1127 break; 1128 } 1129 } 1130 1131 /* 1132 * OK, we're invoking a handler 1133 */ 1134 static void 1135 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, 1136 sigset_t *oldset, struct pt_regs *regs) 1137 { 1138 int err; 1139 /* are we from a system call? */ 1140 if (regs->orig_d0 >= 0) 1141 /* If so, check system call restarting.. */ 1142 handle_restart(regs, ka, 1); 1143 1144 /* set up the stack frame */ 1145 if (ka->sa.sa_flags & SA_SIGINFO) 1146 err = setup_rt_frame(sig, ka, info, oldset, regs); 1147 else 1148 err = setup_frame(sig, ka, oldset, regs); 1149 1150 if (err) 1151 return; 1152 1153 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 1154 if (!(ka->sa.sa_flags & SA_NODEFER)) 1155 sigaddset(¤t->blocked,sig); 1156 recalc_sigpending(); 1157 1158 if (test_thread_flag(TIF_DELAYED_TRACE)) { 1159 regs->sr &= ~0x8000; 1160 send_sig(SIGTRAP, current, 1); 1161 } 1162 1163 clear_thread_flag(TIF_RESTORE_SIGMASK); 1164 } 1165 1166 /* 1167 * Note that 'init' is a special process: it doesn't get signals it doesn't 1168 * want to handle. Thus you cannot kill init even with a SIGKILL even by 1169 * mistake. 1170 */ 1171 asmlinkage void do_signal(struct pt_regs *regs) 1172 { 1173 siginfo_t info; 1174 struct k_sigaction ka; 1175 int signr; 1176 sigset_t *oldset; 1177 1178 current->thread.esp0 = (unsigned long) regs; 1179 1180 if (test_thread_flag(TIF_RESTORE_SIGMASK)) 1181 oldset = ¤t->saved_sigmask; 1182 else 1183 oldset = ¤t->blocked; 1184 1185 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 1186 if (signr > 0) { 1187 /* Whee! Actually deliver the signal. */ 1188 handle_signal(signr, &ka, &info, oldset, regs); 1189 return; 1190 } 1191 1192 /* Did we come from a system call? */ 1193 if (regs->orig_d0 >= 0) 1194 /* Restart the system call - no handlers present */ 1195 handle_restart(regs, NULL, 0); 1196 1197 /* If there's no signal to deliver, we just restore the saved mask. */ 1198 if (test_thread_flag(TIF_RESTORE_SIGMASK)) { 1199 clear_thread_flag(TIF_RESTORE_SIGMASK); 1200 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 1201 } 1202 } 1203