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