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/extable.h> 46 #include <linux/resume_user_mode.h> 47 48 #include <asm/setup.h> 49 #include <linux/uaccess.h> 50 #include <asm/traps.h> 51 #include <asm/ucontext.h> 52 #include <asm/cacheflush.h> 53 54 #include "signal.h" 55 56 #ifdef CONFIG_MMU 57 58 /* 59 * Handle the slight differences in classic 68k and ColdFire trap frames. 60 */ 61 #ifdef CONFIG_COLDFIRE 62 #define FORMAT 4 63 #define FMT4SIZE 0 64 #else 65 #define FORMAT 0 66 #define FMT4SIZE sizeof_field(struct frame, un.fmt4) 67 #endif 68 69 static const int frame_size_change[16] = { 70 [1] = -1, /* sizeof_field(struct frame, un.fmt1), */ 71 [2] = sizeof_field(struct frame, un.fmt2), 72 [3] = sizeof_field(struct frame, un.fmt3), 73 [4] = FMT4SIZE, 74 [5] = -1, /* sizeof_field(struct frame, un.fmt5), */ 75 [6] = -1, /* sizeof_field(struct frame, un.fmt6), */ 76 [7] = sizeof_field(struct frame, un.fmt7), 77 [8] = -1, /* sizeof_field(struct frame, un.fmt8), */ 78 [9] = sizeof_field(struct frame, un.fmt9), 79 [10] = sizeof_field(struct frame, un.fmta), 80 [11] = sizeof_field(struct frame, un.fmtb), 81 [12] = -1, /* sizeof_field(struct frame, un.fmtc), */ 82 [13] = -1, /* sizeof_field(struct frame, un.fmtd), */ 83 [14] = -1, /* sizeof_field(struct frame, un.fmte), */ 84 [15] = -1, /* sizeof_field(struct frame, un.fmtf), */ 85 }; 86 87 static inline int frame_extra_sizes(int f) 88 { 89 return frame_size_change[f]; 90 } 91 92 int fixup_exception(struct pt_regs *regs) 93 { 94 const struct exception_table_entry *fixup; 95 struct pt_regs *tregs; 96 97 /* Are we prepared to handle this kernel fault? */ 98 fixup = search_exception_tables(regs->pc); 99 if (!fixup) 100 return 0; 101 102 /* Create a new four word stack frame, discarding the old one. */ 103 regs->stkadj = frame_extra_sizes(regs->format); 104 tregs = (struct pt_regs *)((long)regs + regs->stkadj); 105 tregs->vector = regs->vector; 106 tregs->format = FORMAT; 107 tregs->pc = fixup->fixup; 108 tregs->sr = regs->sr; 109 110 return 1; 111 } 112 113 static inline void push_cache (unsigned long vaddr) 114 { 115 /* 116 * Using the old cache_push_v() was really a big waste. 117 * 118 * What we are trying to do is to flush 8 bytes to ram. 119 * Flushing 2 cache lines of 16 bytes is much cheaper than 120 * flushing 1 or 2 pages, as previously done in 121 * cache_push_v(). 122 * Jes 123 */ 124 if (CPU_IS_040) { 125 unsigned long temp; 126 127 __asm__ __volatile__ (".chip 68040\n\t" 128 "nop\n\t" 129 "ptestr (%1)\n\t" 130 "movec %%mmusr,%0\n\t" 131 ".chip 68k" 132 : "=r" (temp) 133 : "a" (vaddr)); 134 135 temp &= PAGE_MASK; 136 temp |= vaddr & ~PAGE_MASK; 137 138 __asm__ __volatile__ (".chip 68040\n\t" 139 "nop\n\t" 140 "cpushl %%bc,(%0)\n\t" 141 ".chip 68k" 142 : : "a" (temp)); 143 } 144 else if (CPU_IS_060) { 145 unsigned long temp; 146 __asm__ __volatile__ (".chip 68060\n\t" 147 "plpar (%0)\n\t" 148 ".chip 68k" 149 : "=a" (temp) 150 : "0" (vaddr)); 151 __asm__ __volatile__ (".chip 68060\n\t" 152 "cpushl %%bc,(%0)\n\t" 153 ".chip 68k" 154 : : "a" (temp)); 155 } else if (!CPU_IS_COLDFIRE) { 156 /* 157 * 68030/68020 have no writeback cache; 158 * still need to clear icache. 159 * Note that vaddr is guaranteed to be long word aligned. 160 */ 161 unsigned long temp; 162 asm volatile ("movec %%cacr,%0" : "=r" (temp)); 163 temp += 4; 164 asm volatile ("movec %0,%%caar\n\t" 165 "movec %1,%%cacr" 166 : : "r" (vaddr), "r" (temp)); 167 asm volatile ("movec %0,%%caar\n\t" 168 "movec %1,%%cacr" 169 : : "r" (vaddr + 4), "r" (temp)); 170 } else { 171 /* CPU_IS_COLDFIRE */ 172 #if defined(CONFIG_CACHE_COPYBACK) 173 flush_cf_dcache(0, DCACHE_MAX_ADDR); 174 #endif 175 /* Invalidate instruction cache for the pushed bytes */ 176 clear_cf_icache(vaddr, vaddr + 8); 177 } 178 } 179 180 static inline void adjustformat(struct pt_regs *regs) 181 { 182 } 183 184 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) 185 { 186 } 187 188 #else /* CONFIG_MMU */ 189 190 void ret_from_user_signal(void); 191 void ret_from_user_rt_signal(void); 192 193 static inline int frame_extra_sizes(int f) 194 { 195 /* No frame size adjustments required on non-MMU CPUs */ 196 return 0; 197 } 198 199 static inline void adjustformat(struct pt_regs *regs) 200 { 201 /* 202 * set format byte to make stack appear modulo 4, which it will 203 * be when doing the rte 204 */ 205 regs->format = 0x4; 206 } 207 208 static inline void save_a5_state(struct sigcontext *sc, struct pt_regs *regs) 209 { 210 sc->sc_a5 = ((struct switch_stack *)regs - 1)->a5; 211 } 212 213 static inline void push_cache(unsigned long vaddr) 214 { 215 } 216 217 #endif /* CONFIG_MMU */ 218 219 /* 220 * Do a signal return; undo the signal stack. 221 * 222 * Keep the return code on the stack quadword aligned! 223 * That makes the cache flush below easier. 224 */ 225 226 struct sigframe 227 { 228 char __user *pretcode; 229 int sig; 230 int code; 231 struct sigcontext __user *psc; 232 char retcode[8]; 233 unsigned long extramask[_NSIG_WORDS-1]; 234 struct sigcontext sc; 235 }; 236 237 struct rt_sigframe 238 { 239 char __user *pretcode; 240 int sig; 241 struct siginfo __user *pinfo; 242 void __user *puc; 243 char retcode[8]; 244 struct siginfo info; 245 struct ucontext uc; 246 }; 247 248 #define FPCONTEXT_SIZE 216 249 #define uc_fpstate uc_filler[0] 250 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] 251 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] 252 253 #ifdef CONFIG_FPU 254 255 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ 256 257 static inline int restore_fpu_state(struct sigcontext *sc) 258 { 259 int err = 1; 260 261 if (FPU_IS_EMU) { 262 /* restore registers */ 263 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); 264 memcpy(current->thread.fp, sc->sc_fpregs, 24); 265 return 0; 266 } 267 268 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 269 /* Verify the frame format. */ 270 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && 271 (sc->sc_fpstate[0] != fpu_version)) 272 goto out; 273 if (CPU_IS_020_OR_030) { 274 if (m68k_fputype & FPU_68881 && 275 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) 276 goto out; 277 if (m68k_fputype & FPU_68882 && 278 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) 279 goto out; 280 } else if (CPU_IS_040) { 281 if (!(sc->sc_fpstate[1] == 0x00 || 282 sc->sc_fpstate[1] == 0x28 || 283 sc->sc_fpstate[1] == 0x60)) 284 goto out; 285 } else if (CPU_IS_060) { 286 if (!(sc->sc_fpstate[3] == 0x00 || 287 sc->sc_fpstate[3] == 0x60 || 288 sc->sc_fpstate[3] == 0xe0)) 289 goto out; 290 } else if (CPU_IS_COLDFIRE) { 291 if (!(sc->sc_fpstate[0] == 0x00 || 292 sc->sc_fpstate[0] == 0x05 || 293 sc->sc_fpstate[0] == 0xe5)) 294 goto out; 295 } else 296 goto out; 297 298 if (CPU_IS_COLDFIRE) { 299 __asm__ volatile ("fmovemd %0,%%fp0-%%fp1\n\t" 300 "fmovel %1,%%fpcr\n\t" 301 "fmovel %2,%%fpsr\n\t" 302 "fmovel %3,%%fpiar" 303 : /* no outputs */ 304 : "m" (sc->sc_fpregs[0]), 305 "m" (sc->sc_fpcntl[0]), 306 "m" (sc->sc_fpcntl[1]), 307 "m" (sc->sc_fpcntl[2])); 308 } else { 309 __asm__ volatile (".chip 68k/68881\n\t" 310 "fmovemx %0,%%fp0-%%fp1\n\t" 311 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 312 ".chip 68k" 313 : /* no outputs */ 314 : "m" (*sc->sc_fpregs), 315 "m" (*sc->sc_fpcntl)); 316 } 317 } 318 319 if (CPU_IS_COLDFIRE) { 320 __asm__ volatile ("frestore %0" : : "m" (*sc->sc_fpstate)); 321 } else { 322 __asm__ volatile (".chip 68k/68881\n\t" 323 "frestore %0\n\t" 324 ".chip 68k" 325 : : "m" (*sc->sc_fpstate)); 326 } 327 err = 0; 328 329 out: 330 return err; 331 } 332 333 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 334 { 335 unsigned char fpstate[FPCONTEXT_SIZE]; 336 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); 337 fpregset_t fpregs; 338 int err = 1; 339 340 if (FPU_IS_EMU) { 341 /* restore fpu control register */ 342 if (__copy_from_user(current->thread.fpcntl, 343 uc->uc_mcontext.fpregs.f_fpcntl, 12)) 344 goto out; 345 /* restore all other fpu register */ 346 if (__copy_from_user(current->thread.fp, 347 uc->uc_mcontext.fpregs.f_fpregs, 96)) 348 goto out; 349 return 0; 350 } 351 352 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) 353 goto out; 354 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 355 if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) 356 context_size = fpstate[1]; 357 /* Verify the frame format. */ 358 if (!(CPU_IS_060 || CPU_IS_COLDFIRE) && 359 (fpstate[0] != fpu_version)) 360 goto out; 361 if (CPU_IS_020_OR_030) { 362 if (m68k_fputype & FPU_68881 && 363 !(context_size == 0x18 || context_size == 0xb4)) 364 goto out; 365 if (m68k_fputype & FPU_68882 && 366 !(context_size == 0x38 || context_size == 0xd4)) 367 goto out; 368 } else if (CPU_IS_040) { 369 if (!(context_size == 0x00 || 370 context_size == 0x28 || 371 context_size == 0x60)) 372 goto out; 373 } else if (CPU_IS_060) { 374 if (!(fpstate[3] == 0x00 || 375 fpstate[3] == 0x60 || 376 fpstate[3] == 0xe0)) 377 goto out; 378 } else if (CPU_IS_COLDFIRE) { 379 if (!(fpstate[3] == 0x00 || 380 fpstate[3] == 0x05 || 381 fpstate[3] == 0xe5)) 382 goto out; 383 } else 384 goto out; 385 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, 386 sizeof(fpregs))) 387 goto out; 388 389 if (CPU_IS_COLDFIRE) { 390 __asm__ volatile ("fmovemd %0,%%fp0-%%fp7\n\t" 391 "fmovel %1,%%fpcr\n\t" 392 "fmovel %2,%%fpsr\n\t" 393 "fmovel %3,%%fpiar" 394 : /* no outputs */ 395 : "m" (fpregs.f_fpregs[0]), 396 "m" (fpregs.f_fpcntl[0]), 397 "m" (fpregs.f_fpcntl[1]), 398 "m" (fpregs.f_fpcntl[2])); 399 } else { 400 __asm__ volatile (".chip 68k/68881\n\t" 401 "fmovemx %0,%%fp0-%%fp7\n\t" 402 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 403 ".chip 68k" 404 : /* no outputs */ 405 : "m" (*fpregs.f_fpregs), 406 "m" (*fpregs.f_fpcntl)); 407 } 408 } 409 if (context_size && 410 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, 411 context_size)) 412 goto out; 413 414 if (CPU_IS_COLDFIRE) { 415 __asm__ volatile ("frestore %0" : : "m" (*fpstate)); 416 } else { 417 __asm__ volatile (".chip 68k/68881\n\t" 418 "frestore %0\n\t" 419 ".chip 68k" 420 : : "m" (*fpstate)); 421 } 422 err = 0; 423 424 out: 425 return err; 426 } 427 428 /* 429 * Set up a signal frame. 430 */ 431 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 432 { 433 if (FPU_IS_EMU) { 434 /* save registers */ 435 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); 436 memcpy(sc->sc_fpregs, current->thread.fp, 24); 437 return; 438 } 439 440 if (CPU_IS_COLDFIRE) { 441 __asm__ volatile ("fsave %0" 442 : : "m" (*sc->sc_fpstate) : "memory"); 443 } else { 444 __asm__ volatile (".chip 68k/68881\n\t" 445 "fsave %0\n\t" 446 ".chip 68k" 447 : : "m" (*sc->sc_fpstate) : "memory"); 448 } 449 450 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 451 fpu_version = sc->sc_fpstate[0]; 452 if (CPU_IS_020_OR_030 && !regs->stkadj && 453 regs->vector >= (VEC_FPBRUC * 4) && 454 regs->vector <= (VEC_FPNAN * 4)) { 455 /* Clear pending exception in 68882 idle frame */ 456 if (*(unsigned short *) sc->sc_fpstate == 0x1f38) 457 sc->sc_fpstate[0x38] |= 1 << 3; 458 } 459 460 if (CPU_IS_COLDFIRE) { 461 __asm__ volatile ("fmovemd %%fp0-%%fp1,%0\n\t" 462 "fmovel %%fpcr,%1\n\t" 463 "fmovel %%fpsr,%2\n\t" 464 "fmovel %%fpiar,%3" 465 : "=m" (sc->sc_fpregs[0]), 466 "=m" (sc->sc_fpcntl[0]), 467 "=m" (sc->sc_fpcntl[1]), 468 "=m" (sc->sc_fpcntl[2]) 469 : /* no inputs */ 470 : "memory"); 471 } else { 472 __asm__ volatile (".chip 68k/68881\n\t" 473 "fmovemx %%fp0-%%fp1,%0\n\t" 474 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 475 ".chip 68k" 476 : "=m" (*sc->sc_fpregs), 477 "=m" (*sc->sc_fpcntl) 478 : /* no inputs */ 479 : "memory"); 480 } 481 } 482 } 483 484 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 485 { 486 unsigned char fpstate[FPCONTEXT_SIZE]; 487 int context_size = CPU_IS_060 ? 8 : (CPU_IS_COLDFIRE ? 12 : 0); 488 int err = 0; 489 490 if (FPU_IS_EMU) { 491 /* save fpu control register */ 492 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, 493 current->thread.fpcntl, 12); 494 /* save all other fpu register */ 495 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, 496 current->thread.fp, 96); 497 return err; 498 } 499 500 if (CPU_IS_COLDFIRE) { 501 __asm__ volatile ("fsave %0" : : "m" (*fpstate) : "memory"); 502 } else { 503 __asm__ volatile (".chip 68k/68881\n\t" 504 "fsave %0\n\t" 505 ".chip 68k" 506 : : "m" (*fpstate) : "memory"); 507 } 508 509 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); 510 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 511 fpregset_t fpregs; 512 if (!(CPU_IS_060 || CPU_IS_COLDFIRE)) 513 context_size = fpstate[1]; 514 fpu_version = fpstate[0]; 515 if (CPU_IS_020_OR_030 && !regs->stkadj && 516 regs->vector >= (VEC_FPBRUC * 4) && 517 regs->vector <= (VEC_FPNAN * 4)) { 518 /* Clear pending exception in 68882 idle frame */ 519 if (*(unsigned short *) fpstate == 0x1f38) 520 fpstate[0x38] |= 1 << 3; 521 } 522 if (CPU_IS_COLDFIRE) { 523 __asm__ volatile ("fmovemd %%fp0-%%fp7,%0\n\t" 524 "fmovel %%fpcr,%1\n\t" 525 "fmovel %%fpsr,%2\n\t" 526 "fmovel %%fpiar,%3" 527 : "=m" (fpregs.f_fpregs[0]), 528 "=m" (fpregs.f_fpcntl[0]), 529 "=m" (fpregs.f_fpcntl[1]), 530 "=m" (fpregs.f_fpcntl[2]) 531 : /* no inputs */ 532 : "memory"); 533 } else { 534 __asm__ volatile (".chip 68k/68881\n\t" 535 "fmovemx %%fp0-%%fp7,%0\n\t" 536 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 537 ".chip 68k" 538 : "=m" (*fpregs.f_fpregs), 539 "=m" (*fpregs.f_fpcntl) 540 : /* no inputs */ 541 : "memory"); 542 } 543 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, 544 sizeof(fpregs)); 545 } 546 if (context_size) 547 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, 548 context_size); 549 return err; 550 } 551 552 #else /* CONFIG_FPU */ 553 554 /* 555 * For the case with no FPU configured these all do nothing. 556 */ 557 static inline int restore_fpu_state(struct sigcontext *sc) 558 { 559 return 0; 560 } 561 562 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 563 { 564 return 0; 565 } 566 567 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 568 { 569 } 570 571 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 572 { 573 return 0; 574 } 575 576 #endif /* CONFIG_FPU */ 577 578 static inline void siginfo_build_tests(void) 579 { 580 /* 581 * This needs to be tested on m68k as it has a lesser 582 * alignment requirement than x86 and that can cause surprises. 583 */ 584 585 /* This is part of the ABI and can never change in size: */ 586 BUILD_BUG_ON(sizeof(siginfo_t) != 128); 587 588 /* Ensure the known fields never change in location */ 589 BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0); 590 BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4); 591 BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8); 592 593 /* _kill */ 594 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); 595 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); 596 597 /* _timer */ 598 BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x0c); 599 BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x10); 600 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); 601 602 /* _rt */ 603 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); 604 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); 605 BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x14); 606 607 /* _sigchld */ 608 BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x0c); 609 BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x10); 610 BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x14); 611 BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x18); 612 BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x1c); 613 614 /* _sigfault */ 615 BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x0c); 616 617 /* _sigfault._mcerr */ 618 BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x10); 619 620 /* _sigfault._addr_bnd */ 621 BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x12); 622 BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x16); 623 624 /* _sigfault._addr_pkey */ 625 BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x12); 626 627 /* _sigfault._perf */ 628 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x10); 629 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x14); 630 BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x18); 631 632 /* _sigpoll */ 633 BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x0c); 634 BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x10); 635 636 /* _sigsys */ 637 BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x0c); 638 BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x10); 639 BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x14); 640 641 /* any new si_fields should be added here */ 642 } 643 644 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, 645 void __user *fp) 646 { 647 int extra = frame_extra_sizes(formatvec >> 12); 648 char buf[sizeof_field(struct frame, un)]; 649 650 if (extra < 0) { 651 /* 652 * user process trying to return with weird frame format 653 */ 654 pr_debug("user process returning with weird frame format\n"); 655 return -1; 656 } 657 if (extra && copy_from_user(buf, fp, extra)) 658 return -1; 659 regs->format = formatvec >> 12; 660 regs->vector = formatvec & 0xfff; 661 if (extra) { 662 void *p = (struct switch_stack *)regs - 1; 663 struct frame *new = (void *)regs - extra; 664 int size = sizeof(struct pt_regs)+sizeof(struct switch_stack); 665 666 memmove(p - extra, p, size); 667 memcpy(p - extra + size, buf, extra); 668 current->thread.esp0 = (unsigned long)&new->ptregs; 669 #ifdef CONFIG_M68040 670 /* on 68040 complete pending writebacks if any */ 671 if (new->ptregs.format == 7) // bus error frame 672 berr_040cleanup(new); 673 #endif 674 } 675 return extra; 676 } 677 678 static inline int 679 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) 680 { 681 int formatvec; 682 struct sigcontext context; 683 684 siginfo_build_tests(); 685 686 /* Always make any pending restarted system calls return -EINTR */ 687 current->restart_block.fn = do_no_restart_syscall; 688 689 /* get previous context */ 690 if (copy_from_user(&context, usc, sizeof(context))) 691 return -1; 692 693 /* restore passed registers */ 694 regs->d0 = context.sc_d0; 695 regs->d1 = context.sc_d1; 696 regs->a0 = context.sc_a0; 697 regs->a1 = context.sc_a1; 698 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); 699 regs->pc = context.sc_pc; 700 regs->orig_d0 = -1; /* disable syscall checks */ 701 wrusp(context.sc_usp); 702 formatvec = context.sc_formatvec; 703 704 if (restore_fpu_state(&context)) 705 return -1; 706 707 return mangle_kernel_stack(regs, formatvec, fp); 708 } 709 710 static inline int 711 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, 712 struct ucontext __user *uc) 713 { 714 int temp; 715 greg_t __user *gregs = uc->uc_mcontext.gregs; 716 unsigned long usp; 717 int err; 718 719 /* Always make any pending restarted system calls return -EINTR */ 720 current->restart_block.fn = do_no_restart_syscall; 721 722 err = __get_user(temp, &uc->uc_mcontext.version); 723 if (temp != MCONTEXT_VERSION) 724 return -1; 725 /* restore passed registers */ 726 err |= __get_user(regs->d0, &gregs[0]); 727 err |= __get_user(regs->d1, &gregs[1]); 728 err |= __get_user(regs->d2, &gregs[2]); 729 err |= __get_user(regs->d3, &gregs[3]); 730 err |= __get_user(regs->d4, &gregs[4]); 731 err |= __get_user(regs->d5, &gregs[5]); 732 err |= __get_user(sw->d6, &gregs[6]); 733 err |= __get_user(sw->d7, &gregs[7]); 734 err |= __get_user(regs->a0, &gregs[8]); 735 err |= __get_user(regs->a1, &gregs[9]); 736 err |= __get_user(regs->a2, &gregs[10]); 737 err |= __get_user(sw->a3, &gregs[11]); 738 err |= __get_user(sw->a4, &gregs[12]); 739 err |= __get_user(sw->a5, &gregs[13]); 740 err |= __get_user(sw->a6, &gregs[14]); 741 err |= __get_user(usp, &gregs[15]); 742 wrusp(usp); 743 err |= __get_user(regs->pc, &gregs[16]); 744 err |= __get_user(temp, &gregs[17]); 745 regs->sr = (regs->sr & 0xff00) | (temp & 0xff); 746 regs->orig_d0 = -1; /* disable syscall checks */ 747 err |= __get_user(temp, &uc->uc_formatvec); 748 749 err |= rt_restore_fpu_state(uc); 750 err |= restore_altstack(&uc->uc_stack); 751 752 if (err) 753 return -1; 754 755 return mangle_kernel_stack(regs, temp, &uc->uc_extra); 756 } 757 758 asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw) 759 { 760 unsigned long usp = rdusp(); 761 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); 762 sigset_t set; 763 int size; 764 765 if (!access_ok(frame, sizeof(*frame))) 766 goto badframe; 767 if (__get_user(set.sig[0], &frame->sc.sc_mask) || 768 (_NSIG_WORDS > 1 && 769 __copy_from_user(&set.sig[1], &frame->extramask, 770 sizeof(frame->extramask)))) 771 goto badframe; 772 773 set_current_blocked(&set); 774 775 size = restore_sigcontext(regs, &frame->sc, frame + 1); 776 if (size < 0) 777 goto badframe; 778 return (void *)sw - size; 779 780 badframe: 781 force_sig(SIGSEGV); 782 return sw; 783 } 784 785 asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw) 786 { 787 unsigned long usp = rdusp(); 788 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); 789 sigset_t set; 790 int size; 791 792 if (!access_ok(frame, sizeof(*frame))) 793 goto badframe; 794 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 795 goto badframe; 796 797 set_current_blocked(&set); 798 799 size = rt_restore_ucontext(regs, sw, &frame->uc); 800 if (size < 0) 801 goto badframe; 802 return (void *)sw - size; 803 804 badframe: 805 force_sig(SIGSEGV); 806 return sw; 807 } 808 809 static inline struct pt_regs *rte_regs(struct pt_regs *regs) 810 { 811 return (void *)regs + regs->stkadj; 812 } 813 814 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, 815 unsigned long mask) 816 { 817 struct pt_regs *tregs = rte_regs(regs); 818 sc->sc_mask = mask; 819 sc->sc_usp = rdusp(); 820 sc->sc_d0 = regs->d0; 821 sc->sc_d1 = regs->d1; 822 sc->sc_a0 = regs->a0; 823 sc->sc_a1 = regs->a1; 824 sc->sc_sr = tregs->sr; 825 sc->sc_pc = tregs->pc; 826 sc->sc_formatvec = tregs->format << 12 | tregs->vector; 827 save_a5_state(sc, regs); 828 save_fpu_state(sc, regs); 829 } 830 831 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) 832 { 833 struct switch_stack *sw = (struct switch_stack *)regs - 1; 834 struct pt_regs *tregs = rte_regs(regs); 835 greg_t __user *gregs = uc->uc_mcontext.gregs; 836 int err = 0; 837 838 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); 839 err |= __put_user(regs->d0, &gregs[0]); 840 err |= __put_user(regs->d1, &gregs[1]); 841 err |= __put_user(regs->d2, &gregs[2]); 842 err |= __put_user(regs->d3, &gregs[3]); 843 err |= __put_user(regs->d4, &gregs[4]); 844 err |= __put_user(regs->d5, &gregs[5]); 845 err |= __put_user(sw->d6, &gregs[6]); 846 err |= __put_user(sw->d7, &gregs[7]); 847 err |= __put_user(regs->a0, &gregs[8]); 848 err |= __put_user(regs->a1, &gregs[9]); 849 err |= __put_user(regs->a2, &gregs[10]); 850 err |= __put_user(sw->a3, &gregs[11]); 851 err |= __put_user(sw->a4, &gregs[12]); 852 err |= __put_user(sw->a5, &gregs[13]); 853 err |= __put_user(sw->a6, &gregs[14]); 854 err |= __put_user(rdusp(), &gregs[15]); 855 err |= __put_user(tregs->pc, &gregs[16]); 856 err |= __put_user(tregs->sr, &gregs[17]); 857 err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec); 858 err |= rt_save_fpu_state(uc, regs); 859 return err; 860 } 861 862 static inline void __user * 863 get_sigframe(struct ksignal *ksig, struct pt_regs *tregs, size_t frame_size) 864 { 865 unsigned long usp = sigsp(rdusp(), ksig); 866 unsigned long gap = 0; 867 868 if (CPU_IS_020_OR_030 && tregs->format == 0xb) { 869 /* USP is unreliable so use worst-case value */ 870 gap = 256; 871 } 872 873 return (void __user *)((usp - gap - frame_size) & -8UL); 874 } 875 876 static int setup_frame(struct ksignal *ksig, sigset_t *set, 877 struct pt_regs *regs) 878 { 879 struct sigframe __user *frame; 880 struct pt_regs *tregs = rte_regs(regs); 881 int fsize = frame_extra_sizes(tregs->format); 882 struct sigcontext context; 883 int err = 0, sig = ksig->sig; 884 885 if (fsize < 0) { 886 pr_debug("setup_frame: Unknown frame format %#x\n", 887 tregs->format); 888 return -EFAULT; 889 } 890 891 frame = get_sigframe(ksig, tregs, sizeof(*frame) + fsize); 892 893 if (fsize) 894 err |= copy_to_user (frame + 1, regs + 1, fsize); 895 896 err |= __put_user(sig, &frame->sig); 897 898 err |= __put_user(tregs->vector, &frame->code); 899 err |= __put_user(&frame->sc, &frame->psc); 900 901 if (_NSIG_WORDS > 1) 902 err |= copy_to_user(frame->extramask, &set->sig[1], 903 sizeof(frame->extramask)); 904 905 setup_sigcontext(&context, regs, set->sig[0]); 906 err |= copy_to_user (&frame->sc, &context, sizeof(context)); 907 908 /* Set up to return from userspace. */ 909 #ifdef CONFIG_MMU 910 err |= __put_user(frame->retcode, &frame->pretcode); 911 /* moveq #,d0; trap #0 */ 912 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), 913 (long __user *)(frame->retcode)); 914 #else 915 err |= __put_user((long) ret_from_user_signal, 916 (long __user *) &frame->pretcode); 917 #endif 918 919 if (err) 920 return -EFAULT; 921 922 push_cache ((unsigned long) &frame->retcode); 923 924 /* 925 * This is subtle; if we build more than one sigframe, all but the 926 * first one will see frame format 0 and have fsize == 0, so we won't 927 * screw stkadj. 928 */ 929 if (fsize) { 930 regs->stkadj = fsize; 931 tregs = rte_regs(regs); 932 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); 933 tregs->vector = 0; 934 tregs->format = 0; 935 tregs->sr = regs->sr; 936 } 937 938 /* 939 * Set up registers for signal handler. All the state we are about 940 * to destroy is successfully copied to sigframe. 941 */ 942 wrusp ((unsigned long) frame); 943 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; 944 adjustformat(regs); 945 946 return 0; 947 } 948 949 static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, 950 struct pt_regs *regs) 951 { 952 struct rt_sigframe __user *frame; 953 struct pt_regs *tregs = rte_regs(regs); 954 int fsize = frame_extra_sizes(tregs->format); 955 int err = 0, sig = ksig->sig; 956 957 if (fsize < 0) { 958 pr_debug("setup_frame: Unknown frame format %#x\n", 959 regs->format); 960 return -EFAULT; 961 } 962 963 frame = get_sigframe(ksig, tregs, sizeof(*frame)); 964 965 if (fsize) 966 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); 967 968 err |= __put_user(sig, &frame->sig); 969 err |= __put_user(&frame->info, &frame->pinfo); 970 err |= __put_user(&frame->uc, &frame->puc); 971 err |= copy_siginfo_to_user(&frame->info, &ksig->info); 972 973 /* Create the ucontext. */ 974 err |= __put_user(0, &frame->uc.uc_flags); 975 err |= __put_user(NULL, &frame->uc.uc_link); 976 err |= __save_altstack(&frame->uc.uc_stack, rdusp()); 977 err |= rt_setup_ucontext(&frame->uc, regs); 978 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); 979 980 /* Set up to return from userspace. */ 981 #ifdef CONFIG_MMU 982 err |= __put_user(frame->retcode, &frame->pretcode); 983 #ifdef __mcoldfire__ 984 /* movel #__NR_rt_sigreturn,d0; trap #0 */ 985 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); 986 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), 987 (long __user *)(frame->retcode + 4)); 988 #else 989 /* moveq #,d0; notb d0; trap #0 */ 990 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), 991 (long __user *)(frame->retcode + 0)); 992 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); 993 #endif 994 #else 995 err |= __put_user((long) ret_from_user_rt_signal, 996 (long __user *) &frame->pretcode); 997 #endif /* CONFIG_MMU */ 998 999 if (err) 1000 return -EFAULT; 1001 1002 push_cache ((unsigned long) &frame->retcode); 1003 1004 /* 1005 * This is subtle; if we build more than one sigframe, all but the 1006 * first one will see frame format 0 and have fsize == 0, so we won't 1007 * screw stkadj. 1008 */ 1009 if (fsize) { 1010 regs->stkadj = fsize; 1011 tregs = rte_regs(regs); 1012 pr_debug("Performing stackadjust=%04lx\n", regs->stkadj); 1013 tregs->vector = 0; 1014 tregs->format = 0; 1015 tregs->sr = regs->sr; 1016 } 1017 1018 /* 1019 * Set up registers for signal handler. All the state we are about 1020 * to destroy is successfully copied to sigframe. 1021 */ 1022 wrusp ((unsigned long) frame); 1023 tregs->pc = (unsigned long) ksig->ka.sa.sa_handler; 1024 adjustformat(regs); 1025 return 0; 1026 } 1027 1028 static inline void 1029 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) 1030 { 1031 switch (regs->d0) { 1032 case -ERESTARTNOHAND: 1033 if (!has_handler) 1034 goto do_restart; 1035 regs->d0 = -EINTR; 1036 break; 1037 1038 case -ERESTART_RESTARTBLOCK: 1039 if (!has_handler) { 1040 regs->d0 = __NR_restart_syscall; 1041 regs->pc -= 2; 1042 break; 1043 } 1044 regs->d0 = -EINTR; 1045 break; 1046 1047 case -ERESTARTSYS: 1048 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { 1049 regs->d0 = -EINTR; 1050 break; 1051 } 1052 fallthrough; 1053 case -ERESTARTNOINTR: 1054 do_restart: 1055 regs->d0 = regs->orig_d0; 1056 regs->pc -= 2; 1057 break; 1058 } 1059 } 1060 1061 /* 1062 * OK, we're invoking a handler 1063 */ 1064 static void 1065 handle_signal(struct ksignal *ksig, struct pt_regs *regs) 1066 { 1067 sigset_t *oldset = sigmask_to_save(); 1068 int err; 1069 /* are we from a system call? */ 1070 if (regs->orig_d0 >= 0) 1071 /* If so, check system call restarting.. */ 1072 handle_restart(regs, &ksig->ka, 1); 1073 1074 /* set up the stack frame */ 1075 if (ksig->ka.sa.sa_flags & SA_SIGINFO) 1076 err = setup_rt_frame(ksig, oldset, regs); 1077 else 1078 err = setup_frame(ksig, oldset, regs); 1079 1080 signal_setup_done(err, ksig, 0); 1081 1082 if (test_thread_flag(TIF_DELAYED_TRACE)) { 1083 regs->sr &= ~0x8000; 1084 send_sig(SIGTRAP, current, 1); 1085 } 1086 } 1087 1088 /* 1089 * Note that 'init' is a special process: it doesn't get signals it doesn't 1090 * want to handle. Thus you cannot kill init even with a SIGKILL even by 1091 * mistake. 1092 */ 1093 static void do_signal(struct pt_regs *regs) 1094 { 1095 struct ksignal ksig; 1096 1097 current->thread.esp0 = (unsigned long) regs; 1098 1099 if (get_signal(&ksig)) { 1100 /* Whee! Actually deliver the signal. */ 1101 handle_signal(&ksig, regs); 1102 return; 1103 } 1104 1105 /* Did we come from a system call? */ 1106 if (regs->orig_d0 >= 0) 1107 /* Restart the system call - no handlers present */ 1108 handle_restart(regs, NULL, 0); 1109 1110 /* If there's no signal to deliver, we just restore the saved mask. */ 1111 restore_saved_sigmask(); 1112 } 1113 1114 asmlinkage void do_notify_resume(struct pt_regs *regs) 1115 { 1116 if (test_thread_flag(TIF_NOTIFY_SIGNAL) || 1117 test_thread_flag(TIF_SIGPENDING)) 1118 do_signal(regs); 1119 1120 if (test_thread_flag(TIF_NOTIFY_RESUME)) 1121 resume_user_mode_work(regs); 1122 } 1123