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 46 #include <asm/setup.h> 47 #include <asm/uaccess.h> 48 #include <asm/pgtable.h> 49 #include <asm/traps.h> 50 #include <asm/ucontext.h> 51 52 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 53 54 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs); 55 56 const int frame_extra_sizes[16] = { 57 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ 58 [2] = sizeof(((struct frame *)0)->un.fmt2), 59 [3] = sizeof(((struct frame *)0)->un.fmt3), 60 [4] = sizeof(((struct frame *)0)->un.fmt4), 61 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */ 62 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */ 63 [7] = sizeof(((struct frame *)0)->un.fmt7), 64 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */ 65 [9] = sizeof(((struct frame *)0)->un.fmt9), 66 [10] = sizeof(((struct frame *)0)->un.fmta), 67 [11] = sizeof(((struct frame *)0)->un.fmtb), 68 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */ 69 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */ 70 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */ 71 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ 72 }; 73 74 /* 75 * Atomically swap in the new signal mask, and wait for a signal. 76 */ 77 asmlinkage int do_sigsuspend(struct pt_regs *regs) 78 { 79 old_sigset_t mask = regs->d3; 80 sigset_t saveset; 81 82 mask &= _BLOCKABLE; 83 saveset = current->blocked; 84 siginitset(¤t->blocked, mask); 85 recalc_sigpending(); 86 87 regs->d0 = -EINTR; 88 while (1) { 89 current->state = TASK_INTERRUPTIBLE; 90 schedule(); 91 if (do_signal(&saveset, regs)) 92 return -EINTR; 93 } 94 } 95 96 asmlinkage int 97 do_rt_sigsuspend(struct pt_regs *regs) 98 { 99 sigset_t __user *unewset = (sigset_t __user *)regs->d1; 100 size_t sigsetsize = (size_t)regs->d2; 101 sigset_t saveset, newset; 102 103 /* XXX: Don't preclude handling different sized sigset_t's. */ 104 if (sigsetsize != sizeof(sigset_t)) 105 return -EINVAL; 106 107 if (copy_from_user(&newset, unewset, sizeof(newset))) 108 return -EFAULT; 109 sigdelsetmask(&newset, ~_BLOCKABLE); 110 111 saveset = current->blocked; 112 current->blocked = newset; 113 recalc_sigpending(); 114 115 regs->d0 = -EINTR; 116 while (1) { 117 current->state = TASK_INTERRUPTIBLE; 118 schedule(); 119 if (do_signal(&saveset, regs)) 120 return -EINTR; 121 } 122 } 123 124 asmlinkage int 125 sys_sigaction(int sig, const struct old_sigaction __user *act, 126 struct old_sigaction __user *oact) 127 { 128 struct k_sigaction new_ka, old_ka; 129 int ret; 130 131 if (act) { 132 old_sigset_t mask; 133 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 134 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 135 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 136 return -EFAULT; 137 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 138 __get_user(mask, &act->sa_mask); 139 siginitset(&new_ka.sa.sa_mask, mask); 140 } 141 142 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 143 144 if (!ret && oact) { 145 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 146 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 147 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 148 return -EFAULT; 149 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 150 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 151 } 152 153 return ret; 154 } 155 156 asmlinkage int 157 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) 158 { 159 return do_sigaltstack(uss, uoss, rdusp()); 160 } 161 162 163 /* 164 * Do a signal return; undo the signal stack. 165 * 166 * Keep the return code on the stack quadword aligned! 167 * That makes the cache flush below easier. 168 */ 169 170 struct sigframe 171 { 172 char __user *pretcode; 173 int sig; 174 int code; 175 struct sigcontext __user *psc; 176 char retcode[8]; 177 unsigned long extramask[_NSIG_WORDS-1]; 178 struct sigcontext sc; 179 }; 180 181 struct rt_sigframe 182 { 183 char __user *pretcode; 184 int sig; 185 struct siginfo __user *pinfo; 186 void __user *puc; 187 char retcode[8]; 188 struct siginfo info; 189 struct ucontext uc; 190 }; 191 192 193 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ 194 195 static inline int restore_fpu_state(struct sigcontext *sc) 196 { 197 int err = 1; 198 199 if (FPU_IS_EMU) { 200 /* restore registers */ 201 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); 202 memcpy(current->thread.fp, sc->sc_fpregs, 24); 203 return 0; 204 } 205 206 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 207 /* Verify the frame format. */ 208 if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version)) 209 goto out; 210 if (CPU_IS_020_OR_030) { 211 if (m68k_fputype & FPU_68881 && 212 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) 213 goto out; 214 if (m68k_fputype & FPU_68882 && 215 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) 216 goto out; 217 } else if (CPU_IS_040) { 218 if (!(sc->sc_fpstate[1] == 0x00 || 219 sc->sc_fpstate[1] == 0x28 || 220 sc->sc_fpstate[1] == 0x60)) 221 goto out; 222 } else if (CPU_IS_060) { 223 if (!(sc->sc_fpstate[3] == 0x00 || 224 sc->sc_fpstate[3] == 0x60 || 225 sc->sc_fpstate[3] == 0xe0)) 226 goto out; 227 } else 228 goto out; 229 230 __asm__ volatile (".chip 68k/68881\n\t" 231 "fmovemx %0,%%fp0-%%fp1\n\t" 232 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 233 ".chip 68k" 234 : /* no outputs */ 235 : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl)); 236 } 237 __asm__ volatile (".chip 68k/68881\n\t" 238 "frestore %0\n\t" 239 ".chip 68k" : : "m" (*sc->sc_fpstate)); 240 err = 0; 241 242 out: 243 return err; 244 } 245 246 #define FPCONTEXT_SIZE 216 247 #define uc_fpstate uc_filler[0] 248 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] 249 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] 250 251 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 252 { 253 unsigned char fpstate[FPCONTEXT_SIZE]; 254 int context_size = CPU_IS_060 ? 8 : 0; 255 fpregset_t fpregs; 256 int err = 1; 257 258 if (FPU_IS_EMU) { 259 /* restore fpu control register */ 260 if (__copy_from_user(current->thread.fpcntl, 261 uc->uc_mcontext.fpregs.f_fpcntl, 12)) 262 goto out; 263 /* restore all other fpu register */ 264 if (__copy_from_user(current->thread.fp, 265 uc->uc_mcontext.fpregs.f_fpregs, 96)) 266 goto out; 267 return 0; 268 } 269 270 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) 271 goto out; 272 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 273 if (!CPU_IS_060) 274 context_size = fpstate[1]; 275 /* Verify the frame format. */ 276 if (!CPU_IS_060 && (fpstate[0] != fpu_version)) 277 goto out; 278 if (CPU_IS_020_OR_030) { 279 if (m68k_fputype & FPU_68881 && 280 !(context_size == 0x18 || context_size == 0xb4)) 281 goto out; 282 if (m68k_fputype & FPU_68882 && 283 !(context_size == 0x38 || context_size == 0xd4)) 284 goto out; 285 } else if (CPU_IS_040) { 286 if (!(context_size == 0x00 || 287 context_size == 0x28 || 288 context_size == 0x60)) 289 goto out; 290 } else if (CPU_IS_060) { 291 if (!(fpstate[3] == 0x00 || 292 fpstate[3] == 0x60 || 293 fpstate[3] == 0xe0)) 294 goto out; 295 } else 296 goto out; 297 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, 298 sizeof(fpregs))) 299 goto out; 300 __asm__ volatile (".chip 68k/68881\n\t" 301 "fmovemx %0,%%fp0-%%fp7\n\t" 302 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 303 ".chip 68k" 304 : /* no outputs */ 305 : "m" (*fpregs.f_fpregs), 306 "m" (*fpregs.f_fpcntl)); 307 } 308 if (context_size && 309 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, 310 context_size)) 311 goto out; 312 __asm__ volatile (".chip 68k/68881\n\t" 313 "frestore %0\n\t" 314 ".chip 68k" : : "m" (*fpstate)); 315 err = 0; 316 317 out: 318 return err; 319 } 320 321 static inline int 322 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp, 323 int *pd0) 324 { 325 int fsize, formatvec; 326 struct sigcontext context; 327 int err; 328 329 /* get previous context */ 330 if (copy_from_user(&context, usc, sizeof(context))) 331 goto badframe; 332 333 /* restore passed registers */ 334 regs->d1 = context.sc_d1; 335 regs->a0 = context.sc_a0; 336 regs->a1 = context.sc_a1; 337 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); 338 regs->pc = context.sc_pc; 339 regs->orig_d0 = -1; /* disable syscall checks */ 340 wrusp(context.sc_usp); 341 formatvec = context.sc_formatvec; 342 regs->format = formatvec >> 12; 343 regs->vector = formatvec & 0xfff; 344 345 err = restore_fpu_state(&context); 346 347 fsize = frame_extra_sizes[regs->format]; 348 if (fsize < 0) { 349 /* 350 * user process trying to return with weird frame format 351 */ 352 #ifdef DEBUG 353 printk("user process returning with weird frame format\n"); 354 #endif 355 goto badframe; 356 } 357 358 /* OK. Make room on the supervisor stack for the extra junk, 359 * if necessary. 360 */ 361 362 if (fsize) { 363 struct switch_stack *sw = (struct switch_stack *)regs - 1; 364 regs->d0 = context.sc_d0; 365 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) 366 __asm__ __volatile__ 367 (" movel %0,%/a0\n\t" 368 " subl %1,%/a0\n\t" /* make room on stack */ 369 " movel %/a0,%/sp\n\t" /* set stack pointer */ 370 /* move switch_stack and pt_regs */ 371 "1: movel %0@+,%/a0@+\n\t" 372 " dbra %2,1b\n\t" 373 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ 374 " lsrl #2,%1\n\t" 375 " subql #1,%1\n\t" 376 "2: movesl %4@+,%2\n\t" 377 "3: movel %2,%/a0@+\n\t" 378 " dbra %1,2b\n\t" 379 " bral ret_from_signal\n" 380 "4:\n" 381 ".section __ex_table,\"a\"\n" 382 " .align 4\n" 383 " .long 2b,4b\n" 384 " .long 3b,4b\n" 385 ".previous" 386 : /* no outputs, it doesn't ever return */ 387 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), 388 "n" (frame_offset), "a" (fp) 389 : "a0"); 390 #undef frame_offset 391 /* 392 * If we ever get here an exception occurred while 393 * building the above stack-frame. 394 */ 395 goto badframe; 396 } 397 398 *pd0 = context.sc_d0; 399 return err; 400 401 badframe: 402 return 1; 403 } 404 405 static inline int 406 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, 407 struct ucontext __user *uc, int *pd0) 408 { 409 int fsize, temp; 410 greg_t __user *gregs = uc->uc_mcontext.gregs; 411 unsigned long usp; 412 int err; 413 414 err = __get_user(temp, &uc->uc_mcontext.version); 415 if (temp != MCONTEXT_VERSION) 416 goto badframe; 417 /* restore passed registers */ 418 err |= __get_user(regs->d0, &gregs[0]); 419 err |= __get_user(regs->d1, &gregs[1]); 420 err |= __get_user(regs->d2, &gregs[2]); 421 err |= __get_user(regs->d3, &gregs[3]); 422 err |= __get_user(regs->d4, &gregs[4]); 423 err |= __get_user(regs->d5, &gregs[5]); 424 err |= __get_user(sw->d6, &gregs[6]); 425 err |= __get_user(sw->d7, &gregs[7]); 426 err |= __get_user(regs->a0, &gregs[8]); 427 err |= __get_user(regs->a1, &gregs[9]); 428 err |= __get_user(regs->a2, &gregs[10]); 429 err |= __get_user(sw->a3, &gregs[11]); 430 err |= __get_user(sw->a4, &gregs[12]); 431 err |= __get_user(sw->a5, &gregs[13]); 432 err |= __get_user(sw->a6, &gregs[14]); 433 err |= __get_user(usp, &gregs[15]); 434 wrusp(usp); 435 err |= __get_user(regs->pc, &gregs[16]); 436 err |= __get_user(temp, &gregs[17]); 437 regs->sr = (regs->sr & 0xff00) | (temp & 0xff); 438 regs->orig_d0 = -1; /* disable syscall checks */ 439 err |= __get_user(temp, &uc->uc_formatvec); 440 regs->format = temp >> 12; 441 regs->vector = temp & 0xfff; 442 443 err |= rt_restore_fpu_state(uc); 444 445 if (do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) 446 goto badframe; 447 448 fsize = frame_extra_sizes[regs->format]; 449 if (fsize < 0) { 450 /* 451 * user process trying to return with weird frame format 452 */ 453 #ifdef DEBUG 454 printk("user process returning with weird frame format\n"); 455 #endif 456 goto badframe; 457 } 458 459 /* OK. Make room on the supervisor stack for the extra junk, 460 * if necessary. 461 */ 462 463 if (fsize) { 464 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) 465 __asm__ __volatile__ 466 (" movel %0,%/a0\n\t" 467 " subl %1,%/a0\n\t" /* make room on stack */ 468 " movel %/a0,%/sp\n\t" /* set stack pointer */ 469 /* move switch_stack and pt_regs */ 470 "1: movel %0@+,%/a0@+\n\t" 471 " dbra %2,1b\n\t" 472 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ 473 " lsrl #2,%1\n\t" 474 " subql #1,%1\n\t" 475 "2: movesl %4@+,%2\n\t" 476 "3: movel %2,%/a0@+\n\t" 477 " dbra %1,2b\n\t" 478 " bral ret_from_signal\n" 479 "4:\n" 480 ".section __ex_table,\"a\"\n" 481 " .align 4\n" 482 " .long 2b,4b\n" 483 " .long 3b,4b\n" 484 ".previous" 485 : /* no outputs, it doesn't ever return */ 486 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), 487 "n" (frame_offset), "a" (&uc->uc_extra) 488 : "a0"); 489 #undef frame_offset 490 /* 491 * If we ever get here an exception occurred while 492 * building the above stack-frame. 493 */ 494 goto badframe; 495 } 496 497 *pd0 = regs->d0; 498 return err; 499 500 badframe: 501 return 1; 502 } 503 504 asmlinkage int do_sigreturn(unsigned long __unused) 505 { 506 struct switch_stack *sw = (struct switch_stack *) &__unused; 507 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 508 unsigned long usp = rdusp(); 509 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); 510 sigset_t set; 511 int d0; 512 513 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 514 goto badframe; 515 if (__get_user(set.sig[0], &frame->sc.sc_mask) || 516 (_NSIG_WORDS > 1 && 517 __copy_from_user(&set.sig[1], &frame->extramask, 518 sizeof(frame->extramask)))) 519 goto badframe; 520 521 sigdelsetmask(&set, ~_BLOCKABLE); 522 current->blocked = set; 523 recalc_sigpending(); 524 525 if (restore_sigcontext(regs, &frame->sc, frame + 1, &d0)) 526 goto badframe; 527 return d0; 528 529 badframe: 530 force_sig(SIGSEGV, current); 531 return 0; 532 } 533 534 asmlinkage int do_rt_sigreturn(unsigned long __unused) 535 { 536 struct switch_stack *sw = (struct switch_stack *) &__unused; 537 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 538 unsigned long usp = rdusp(); 539 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); 540 sigset_t set; 541 int d0; 542 543 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 544 goto badframe; 545 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 546 goto badframe; 547 548 sigdelsetmask(&set, ~_BLOCKABLE); 549 current->blocked = set; 550 recalc_sigpending(); 551 552 if (rt_restore_ucontext(regs, sw, &frame->uc, &d0)) 553 goto badframe; 554 return d0; 555 556 badframe: 557 force_sig(SIGSEGV, current); 558 return 0; 559 } 560 561 /* 562 * Set up a signal frame. 563 */ 564 565 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 566 { 567 if (FPU_IS_EMU) { 568 /* save registers */ 569 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); 570 memcpy(sc->sc_fpregs, current->thread.fp, 24); 571 return; 572 } 573 574 __asm__ volatile (".chip 68k/68881\n\t" 575 "fsave %0\n\t" 576 ".chip 68k" 577 : : "m" (*sc->sc_fpstate) : "memory"); 578 579 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 580 fpu_version = sc->sc_fpstate[0]; 581 if (CPU_IS_020_OR_030 && 582 regs->vector >= (VEC_FPBRUC * 4) && 583 regs->vector <= (VEC_FPNAN * 4)) { 584 /* Clear pending exception in 68882 idle frame */ 585 if (*(unsigned short *) sc->sc_fpstate == 0x1f38) 586 sc->sc_fpstate[0x38] |= 1 << 3; 587 } 588 __asm__ volatile (".chip 68k/68881\n\t" 589 "fmovemx %%fp0-%%fp1,%0\n\t" 590 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 591 ".chip 68k" 592 : "=m" (*sc->sc_fpregs), 593 "=m" (*sc->sc_fpcntl) 594 : /* no inputs */ 595 : "memory"); 596 } 597 } 598 599 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 600 { 601 unsigned char fpstate[FPCONTEXT_SIZE]; 602 int context_size = CPU_IS_060 ? 8 : 0; 603 int err = 0; 604 605 if (FPU_IS_EMU) { 606 /* save fpu control register */ 607 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, 608 current->thread.fpcntl, 12); 609 /* save all other fpu register */ 610 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, 611 current->thread.fp, 96); 612 return err; 613 } 614 615 __asm__ volatile (".chip 68k/68881\n\t" 616 "fsave %0\n\t" 617 ".chip 68k" 618 : : "m" (*fpstate) : "memory"); 619 620 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); 621 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 622 fpregset_t fpregs; 623 if (!CPU_IS_060) 624 context_size = fpstate[1]; 625 fpu_version = fpstate[0]; 626 if (CPU_IS_020_OR_030 && 627 regs->vector >= (VEC_FPBRUC * 4) && 628 regs->vector <= (VEC_FPNAN * 4)) { 629 /* Clear pending exception in 68882 idle frame */ 630 if (*(unsigned short *) fpstate == 0x1f38) 631 fpstate[0x38] |= 1 << 3; 632 } 633 __asm__ volatile (".chip 68k/68881\n\t" 634 "fmovemx %%fp0-%%fp7,%0\n\t" 635 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 636 ".chip 68k" 637 : "=m" (*fpregs.f_fpregs), 638 "=m" (*fpregs.f_fpcntl) 639 : /* no inputs */ 640 : "memory"); 641 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, 642 sizeof(fpregs)); 643 } 644 if (context_size) 645 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, 646 context_size); 647 return err; 648 } 649 650 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, 651 unsigned long mask) 652 { 653 sc->sc_mask = mask; 654 sc->sc_usp = rdusp(); 655 sc->sc_d0 = regs->d0; 656 sc->sc_d1 = regs->d1; 657 sc->sc_a0 = regs->a0; 658 sc->sc_a1 = regs->a1; 659 sc->sc_sr = regs->sr; 660 sc->sc_pc = regs->pc; 661 sc->sc_formatvec = regs->format << 12 | regs->vector; 662 save_fpu_state(sc, regs); 663 } 664 665 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) 666 { 667 struct switch_stack *sw = (struct switch_stack *)regs - 1; 668 greg_t __user *gregs = uc->uc_mcontext.gregs; 669 int err = 0; 670 671 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); 672 err |= __put_user(regs->d0, &gregs[0]); 673 err |= __put_user(regs->d1, &gregs[1]); 674 err |= __put_user(regs->d2, &gregs[2]); 675 err |= __put_user(regs->d3, &gregs[3]); 676 err |= __put_user(regs->d4, &gregs[4]); 677 err |= __put_user(regs->d5, &gregs[5]); 678 err |= __put_user(sw->d6, &gregs[6]); 679 err |= __put_user(sw->d7, &gregs[7]); 680 err |= __put_user(regs->a0, &gregs[8]); 681 err |= __put_user(regs->a1, &gregs[9]); 682 err |= __put_user(regs->a2, &gregs[10]); 683 err |= __put_user(sw->a3, &gregs[11]); 684 err |= __put_user(sw->a4, &gregs[12]); 685 err |= __put_user(sw->a5, &gregs[13]); 686 err |= __put_user(sw->a6, &gregs[14]); 687 err |= __put_user(rdusp(), &gregs[15]); 688 err |= __put_user(regs->pc, &gregs[16]); 689 err |= __put_user(regs->sr, &gregs[17]); 690 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); 691 err |= rt_save_fpu_state(uc, regs); 692 return err; 693 } 694 695 static inline void push_cache (unsigned long vaddr) 696 { 697 /* 698 * Using the old cache_push_v() was really a big waste. 699 * 700 * What we are trying to do is to flush 8 bytes to ram. 701 * Flushing 2 cache lines of 16 bytes is much cheaper than 702 * flushing 1 or 2 pages, as previously done in 703 * cache_push_v(). 704 * Jes 705 */ 706 if (CPU_IS_040) { 707 unsigned long temp; 708 709 __asm__ __volatile__ (".chip 68040\n\t" 710 "nop\n\t" 711 "ptestr (%1)\n\t" 712 "movec %%mmusr,%0\n\t" 713 ".chip 68k" 714 : "=r" (temp) 715 : "a" (vaddr)); 716 717 temp &= PAGE_MASK; 718 temp |= vaddr & ~PAGE_MASK; 719 720 __asm__ __volatile__ (".chip 68040\n\t" 721 "nop\n\t" 722 "cpushl %%bc,(%0)\n\t" 723 ".chip 68k" 724 : : "a" (temp)); 725 } 726 else if (CPU_IS_060) { 727 unsigned long temp; 728 __asm__ __volatile__ (".chip 68060\n\t" 729 "plpar (%0)\n\t" 730 ".chip 68k" 731 : "=a" (temp) 732 : "0" (vaddr)); 733 __asm__ __volatile__ (".chip 68060\n\t" 734 "cpushl %%bc,(%0)\n\t" 735 ".chip 68k" 736 : : "a" (temp)); 737 } 738 else { 739 /* 740 * 68030/68020 have no writeback cache; 741 * still need to clear icache. 742 * Note that vaddr is guaranteed to be long word aligned. 743 */ 744 unsigned long temp; 745 asm volatile ("movec %%cacr,%0" : "=r" (temp)); 746 temp += 4; 747 asm volatile ("movec %0,%%caar\n\t" 748 "movec %1,%%cacr" 749 : : "r" (vaddr), "r" (temp)); 750 asm volatile ("movec %0,%%caar\n\t" 751 "movec %1,%%cacr" 752 : : "r" (vaddr + 4), "r" (temp)); 753 } 754 } 755 756 static inline void __user * 757 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 758 { 759 unsigned long usp; 760 761 /* Default to using normal stack. */ 762 usp = rdusp(); 763 764 /* This is the X/Open sanctioned signal stack switching. */ 765 if (ka->sa.sa_flags & SA_ONSTACK) { 766 if (!sas_ss_flags(usp)) 767 usp = current->sas_ss_sp + current->sas_ss_size; 768 } 769 return (void __user *)((usp - frame_size) & -8UL); 770 } 771 772 static void setup_frame (int sig, struct k_sigaction *ka, 773 sigset_t *set, struct pt_regs *regs) 774 { 775 struct sigframe __user *frame; 776 int fsize = frame_extra_sizes[regs->format]; 777 struct sigcontext context; 778 int err = 0; 779 780 if (fsize < 0) { 781 #ifdef DEBUG 782 printk ("setup_frame: Unknown frame format %#x\n", 783 regs->format); 784 #endif 785 goto give_sigsegv; 786 } 787 788 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); 789 790 if (fsize) { 791 err |= copy_to_user (frame + 1, regs + 1, fsize); 792 regs->stkadj = fsize; 793 } 794 795 err |= __put_user((current_thread_info()->exec_domain 796 && current_thread_info()->exec_domain->signal_invmap 797 && sig < 32 798 ? current_thread_info()->exec_domain->signal_invmap[sig] 799 : sig), 800 &frame->sig); 801 802 err |= __put_user(regs->vector, &frame->code); 803 err |= __put_user(&frame->sc, &frame->psc); 804 805 if (_NSIG_WORDS > 1) 806 err |= copy_to_user(frame->extramask, &set->sig[1], 807 sizeof(frame->extramask)); 808 809 setup_sigcontext(&context, regs, set->sig[0]); 810 err |= copy_to_user (&frame->sc, &context, sizeof(context)); 811 812 /* Set up to return from userspace. */ 813 err |= __put_user(frame->retcode, &frame->pretcode); 814 /* moveq #,d0; trap #0 */ 815 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), 816 (long __user *)(frame->retcode)); 817 818 if (err) 819 goto give_sigsegv; 820 821 push_cache ((unsigned long) &frame->retcode); 822 823 /* Set up registers for signal handler */ 824 wrusp ((unsigned long) frame); 825 regs->pc = (unsigned long) ka->sa.sa_handler; 826 827 adjust_stack: 828 /* Prepare to skip over the extra stuff in the exception frame. */ 829 if (regs->stkadj) { 830 struct pt_regs *tregs = 831 (struct pt_regs *)((ulong)regs + regs->stkadj); 832 #ifdef DEBUG 833 printk("Performing stackadjust=%04x\n", regs->stkadj); 834 #endif 835 /* This must be copied with decreasing addresses to 836 handle overlaps. */ 837 tregs->vector = 0; 838 tregs->format = 0; 839 tregs->pc = regs->pc; 840 tregs->sr = regs->sr; 841 } 842 return; 843 844 give_sigsegv: 845 force_sigsegv(sig, current); 846 goto adjust_stack; 847 } 848 849 static void setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, 850 sigset_t *set, struct pt_regs *regs) 851 { 852 struct rt_sigframe __user *frame; 853 int fsize = frame_extra_sizes[regs->format]; 854 int err = 0; 855 856 if (fsize < 0) { 857 #ifdef DEBUG 858 printk ("setup_frame: Unknown frame format %#x\n", 859 regs->format); 860 #endif 861 goto give_sigsegv; 862 } 863 864 frame = get_sigframe(ka, regs, sizeof(*frame)); 865 866 if (fsize) { 867 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); 868 regs->stkadj = fsize; 869 } 870 871 err |= __put_user((current_thread_info()->exec_domain 872 && current_thread_info()->exec_domain->signal_invmap 873 && sig < 32 874 ? current_thread_info()->exec_domain->signal_invmap[sig] 875 : sig), 876 &frame->sig); 877 err |= __put_user(&frame->info, &frame->pinfo); 878 err |= __put_user(&frame->uc, &frame->puc); 879 err |= copy_siginfo_to_user(&frame->info, info); 880 881 /* Create the ucontext. */ 882 err |= __put_user(0, &frame->uc.uc_flags); 883 err |= __put_user(NULL, &frame->uc.uc_link); 884 err |= __put_user((void __user *)current->sas_ss_sp, 885 &frame->uc.uc_stack.ss_sp); 886 err |= __put_user(sas_ss_flags(rdusp()), 887 &frame->uc.uc_stack.ss_flags); 888 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); 889 err |= rt_setup_ucontext(&frame->uc, regs); 890 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); 891 892 /* Set up to return from userspace. */ 893 err |= __put_user(frame->retcode, &frame->pretcode); 894 /* moveq #,d0; notb d0; trap #0 */ 895 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), 896 (long __user *)(frame->retcode + 0)); 897 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); 898 899 if (err) 900 goto give_sigsegv; 901 902 push_cache ((unsigned long) &frame->retcode); 903 904 /* Set up registers for signal handler */ 905 wrusp ((unsigned long) frame); 906 regs->pc = (unsigned long) ka->sa.sa_handler; 907 908 adjust_stack: 909 /* Prepare to skip over the extra stuff in the exception frame. */ 910 if (regs->stkadj) { 911 struct pt_regs *tregs = 912 (struct pt_regs *)((ulong)regs + regs->stkadj); 913 #ifdef DEBUG 914 printk("Performing stackadjust=%04x\n", regs->stkadj); 915 #endif 916 /* This must be copied with decreasing addresses to 917 handle overlaps. */ 918 tregs->vector = 0; 919 tregs->format = 0; 920 tregs->pc = regs->pc; 921 tregs->sr = regs->sr; 922 } 923 return; 924 925 give_sigsegv: 926 force_sigsegv(sig, current); 927 goto adjust_stack; 928 } 929 930 static inline void 931 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) 932 { 933 switch (regs->d0) { 934 case -ERESTARTNOHAND: 935 if (!has_handler) 936 goto do_restart; 937 regs->d0 = -EINTR; 938 break; 939 940 case -ERESTARTSYS: 941 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { 942 regs->d0 = -EINTR; 943 break; 944 } 945 /* fallthrough */ 946 case -ERESTARTNOINTR: 947 do_restart: 948 regs->d0 = regs->orig_d0; 949 regs->pc -= 2; 950 break; 951 } 952 } 953 954 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) 955 { 956 if (regs->orig_d0 < 0) 957 return; 958 switch (regs->d0) { 959 case -ERESTARTNOHAND: 960 case -ERESTARTSYS: 961 case -ERESTARTNOINTR: 962 regs->d0 = regs->orig_d0; 963 regs->orig_d0 = -1; 964 regs->pc -= 2; 965 break; 966 } 967 } 968 969 /* 970 * OK, we're invoking a handler 971 */ 972 static void 973 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, 974 sigset_t *oldset, struct pt_regs *regs) 975 { 976 /* are we from a system call? */ 977 if (regs->orig_d0 >= 0) 978 /* If so, check system call restarting.. */ 979 handle_restart(regs, ka, 1); 980 981 /* set up the stack frame */ 982 if (ka->sa.sa_flags & SA_SIGINFO) 983 setup_rt_frame(sig, ka, info, oldset, regs); 984 else 985 setup_frame(sig, ka, oldset, regs); 986 987 if (ka->sa.sa_flags & SA_ONESHOT) 988 ka->sa.sa_handler = SIG_DFL; 989 990 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 991 if (!(ka->sa.sa_flags & SA_NODEFER)) 992 sigaddset(¤t->blocked,sig); 993 recalc_sigpending(); 994 } 995 996 /* 997 * Note that 'init' is a special process: it doesn't get signals it doesn't 998 * want to handle. Thus you cannot kill init even with a SIGKILL even by 999 * mistake. 1000 */ 1001 asmlinkage int do_signal(sigset_t *oldset, struct pt_regs *regs) 1002 { 1003 siginfo_t info; 1004 struct k_sigaction ka; 1005 int signr; 1006 1007 current->thread.esp0 = (unsigned long) regs; 1008 1009 if (!oldset) 1010 oldset = ¤t->blocked; 1011 1012 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 1013 if (signr > 0) { 1014 /* Whee! Actually deliver the signal. */ 1015 handle_signal(signr, &ka, &info, oldset, regs); 1016 return 1; 1017 } 1018 1019 /* Did we come from a system call? */ 1020 if (regs->orig_d0 >= 0) 1021 /* Restart the system call - no handlers present */ 1022 handle_restart(regs, NULL, 0); 1023 1024 return 0; 1025 } 1026