1 /* 2 * linux/arch/m68k/kernel/signal.c 3 * 4 * Copyright (C) 1991, 1992 Linus Torvalds 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 */ 10 11 /* 12 * Linux/m68k support by Hamish Macdonald 13 * 14 * 68060 fixes by Jesper Skov 15 * 16 * 1997-12-01 Modified for POSIX.1b signals by Andreas Schwab 17 * 18 * mathemu support by Roman Zippel 19 * (Note: fpstate in the signal context is completely ignored for the emulator 20 * and the internal floating point format is put on stack) 21 */ 22 23 /* 24 * ++roman (07/09/96): implemented signal stacks (specially for tosemu on 25 * Atari :-) Current limitation: Only one sigstack can be active at one time. 26 * If a second signal with SA_ONSTACK set arrives while working on a sigstack, 27 * SA_ONSTACK is ignored. This behaviour avoids lots of trouble with nested 28 * signal handlers! 29 */ 30 31 #include <linux/sched.h> 32 #include <linux/mm.h> 33 #include <linux/kernel.h> 34 #include <linux/signal.h> 35 #include <linux/syscalls.h> 36 #include <linux/errno.h> 37 #include <linux/wait.h> 38 #include <linux/ptrace.h> 39 #include <linux/unistd.h> 40 #include <linux/stddef.h> 41 #include <linux/highuid.h> 42 #include <linux/personality.h> 43 #include <linux/tty.h> 44 #include <linux/binfmts.h> 45 #include <linux/module.h> 46 47 #include <asm/setup.h> 48 #include <asm/uaccess.h> 49 #include <asm/pgtable.h> 50 #include <asm/traps.h> 51 #include <asm/ucontext.h> 52 53 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 54 55 static const int frame_extra_sizes[16] = { 56 [1] = -1, /* sizeof(((struct frame *)0)->un.fmt1), */ 57 [2] = sizeof(((struct frame *)0)->un.fmt2), 58 [3] = sizeof(((struct frame *)0)->un.fmt3), 59 [4] = sizeof(((struct frame *)0)->un.fmt4), 60 [5] = -1, /* sizeof(((struct frame *)0)->un.fmt5), */ 61 [6] = -1, /* sizeof(((struct frame *)0)->un.fmt6), */ 62 [7] = sizeof(((struct frame *)0)->un.fmt7), 63 [8] = -1, /* sizeof(((struct frame *)0)->un.fmt8), */ 64 [9] = sizeof(((struct frame *)0)->un.fmt9), 65 [10] = sizeof(((struct frame *)0)->un.fmta), 66 [11] = sizeof(((struct frame *)0)->un.fmtb), 67 [12] = -1, /* sizeof(((struct frame *)0)->un.fmtc), */ 68 [13] = -1, /* sizeof(((struct frame *)0)->un.fmtd), */ 69 [14] = -1, /* sizeof(((struct frame *)0)->un.fmte), */ 70 [15] = -1, /* sizeof(((struct frame *)0)->un.fmtf), */ 71 }; 72 73 int handle_kernel_fault(struct pt_regs *regs) 74 { 75 const struct exception_table_entry *fixup; 76 struct pt_regs *tregs; 77 78 /* Are we prepared to handle this kernel fault? */ 79 fixup = search_exception_tables(regs->pc); 80 if (!fixup) 81 return 0; 82 83 /* Create a new four word stack frame, discarding the old one. */ 84 regs->stkadj = frame_extra_sizes[regs->format]; 85 tregs = (struct pt_regs *)((long)regs + regs->stkadj); 86 tregs->vector = regs->vector; 87 tregs->format = 0; 88 tregs->pc = fixup->fixup; 89 tregs->sr = regs->sr; 90 91 return 1; 92 } 93 94 /* 95 * Atomically swap in the new signal mask, and wait for a signal. 96 */ 97 asmlinkage int 98 sys_sigsuspend(int unused0, int unused1, old_sigset_t mask) 99 { 100 mask &= _BLOCKABLE; 101 spin_lock_irq(¤t->sighand->siglock); 102 current->saved_sigmask = current->blocked; 103 siginitset(¤t->blocked, mask); 104 recalc_sigpending(); 105 spin_unlock_irq(¤t->sighand->siglock); 106 107 current->state = TASK_INTERRUPTIBLE; 108 schedule(); 109 set_restore_sigmask(); 110 111 return -ERESTARTNOHAND; 112 } 113 114 asmlinkage int 115 sys_sigaction(int sig, const struct old_sigaction __user *act, 116 struct old_sigaction __user *oact) 117 { 118 struct k_sigaction new_ka, old_ka; 119 int ret; 120 121 if (act) { 122 old_sigset_t mask; 123 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 124 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 125 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) || 126 __get_user(new_ka.sa.sa_flags, &act->sa_flags) || 127 __get_user(mask, &act->sa_mask)) 128 return -EFAULT; 129 siginitset(&new_ka.sa.sa_mask, mask); 130 } 131 132 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 133 134 if (!ret && oact) { 135 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 136 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 137 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) || 138 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) || 139 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask)) 140 return -EFAULT; 141 } 142 143 return ret; 144 } 145 146 asmlinkage int 147 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss) 148 { 149 return do_sigaltstack(uss, uoss, rdusp()); 150 } 151 152 153 /* 154 * Do a signal return; undo the signal stack. 155 * 156 * Keep the return code on the stack quadword aligned! 157 * That makes the cache flush below easier. 158 */ 159 160 struct sigframe 161 { 162 char __user *pretcode; 163 int sig; 164 int code; 165 struct sigcontext __user *psc; 166 char retcode[8]; 167 unsigned long extramask[_NSIG_WORDS-1]; 168 struct sigcontext sc; 169 }; 170 171 struct rt_sigframe 172 { 173 char __user *pretcode; 174 int sig; 175 struct siginfo __user *pinfo; 176 void __user *puc; 177 char retcode[8]; 178 struct siginfo info; 179 struct ucontext uc; 180 }; 181 182 183 static unsigned char fpu_version; /* version number of fpu, set by setup_frame */ 184 185 static inline int restore_fpu_state(struct sigcontext *sc) 186 { 187 int err = 1; 188 189 if (FPU_IS_EMU) { 190 /* restore registers */ 191 memcpy(current->thread.fpcntl, sc->sc_fpcntl, 12); 192 memcpy(current->thread.fp, sc->sc_fpregs, 24); 193 return 0; 194 } 195 196 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 197 /* Verify the frame format. */ 198 if (!CPU_IS_060 && (sc->sc_fpstate[0] != fpu_version)) 199 goto out; 200 if (CPU_IS_020_OR_030) { 201 if (m68k_fputype & FPU_68881 && 202 !(sc->sc_fpstate[1] == 0x18 || sc->sc_fpstate[1] == 0xb4)) 203 goto out; 204 if (m68k_fputype & FPU_68882 && 205 !(sc->sc_fpstate[1] == 0x38 || sc->sc_fpstate[1] == 0xd4)) 206 goto out; 207 } else if (CPU_IS_040) { 208 if (!(sc->sc_fpstate[1] == 0x00 || 209 sc->sc_fpstate[1] == 0x28 || 210 sc->sc_fpstate[1] == 0x60)) 211 goto out; 212 } else if (CPU_IS_060) { 213 if (!(sc->sc_fpstate[3] == 0x00 || 214 sc->sc_fpstate[3] == 0x60 || 215 sc->sc_fpstate[3] == 0xe0)) 216 goto out; 217 } else 218 goto out; 219 220 __asm__ volatile (".chip 68k/68881\n\t" 221 "fmovemx %0,%%fp0-%%fp1\n\t" 222 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 223 ".chip 68k" 224 : /* no outputs */ 225 : "m" (*sc->sc_fpregs), "m" (*sc->sc_fpcntl)); 226 } 227 __asm__ volatile (".chip 68k/68881\n\t" 228 "frestore %0\n\t" 229 ".chip 68k" : : "m" (*sc->sc_fpstate)); 230 err = 0; 231 232 out: 233 return err; 234 } 235 236 #define FPCONTEXT_SIZE 216 237 #define uc_fpstate uc_filler[0] 238 #define uc_formatvec uc_filler[FPCONTEXT_SIZE/4] 239 #define uc_extra uc_filler[FPCONTEXT_SIZE/4+1] 240 241 static inline int rt_restore_fpu_state(struct ucontext __user *uc) 242 { 243 unsigned char fpstate[FPCONTEXT_SIZE]; 244 int context_size = CPU_IS_060 ? 8 : 0; 245 fpregset_t fpregs; 246 int err = 1; 247 248 if (FPU_IS_EMU) { 249 /* restore fpu control register */ 250 if (__copy_from_user(current->thread.fpcntl, 251 uc->uc_mcontext.fpregs.f_fpcntl, 12)) 252 goto out; 253 /* restore all other fpu register */ 254 if (__copy_from_user(current->thread.fp, 255 uc->uc_mcontext.fpregs.f_fpregs, 96)) 256 goto out; 257 return 0; 258 } 259 260 if (__get_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate)) 261 goto out; 262 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 263 if (!CPU_IS_060) 264 context_size = fpstate[1]; 265 /* Verify the frame format. */ 266 if (!CPU_IS_060 && (fpstate[0] != fpu_version)) 267 goto out; 268 if (CPU_IS_020_OR_030) { 269 if (m68k_fputype & FPU_68881 && 270 !(context_size == 0x18 || context_size == 0xb4)) 271 goto out; 272 if (m68k_fputype & FPU_68882 && 273 !(context_size == 0x38 || context_size == 0xd4)) 274 goto out; 275 } else if (CPU_IS_040) { 276 if (!(context_size == 0x00 || 277 context_size == 0x28 || 278 context_size == 0x60)) 279 goto out; 280 } else if (CPU_IS_060) { 281 if (!(fpstate[3] == 0x00 || 282 fpstate[3] == 0x60 || 283 fpstate[3] == 0xe0)) 284 goto out; 285 } else 286 goto out; 287 if (__copy_from_user(&fpregs, &uc->uc_mcontext.fpregs, 288 sizeof(fpregs))) 289 goto out; 290 __asm__ volatile (".chip 68k/68881\n\t" 291 "fmovemx %0,%%fp0-%%fp7\n\t" 292 "fmoveml %1,%%fpcr/%%fpsr/%%fpiar\n\t" 293 ".chip 68k" 294 : /* no outputs */ 295 : "m" (*fpregs.f_fpregs), 296 "m" (*fpregs.f_fpcntl)); 297 } 298 if (context_size && 299 __copy_from_user(fpstate + 4, (long __user *)&uc->uc_fpstate + 1, 300 context_size)) 301 goto out; 302 __asm__ volatile (".chip 68k/68881\n\t" 303 "frestore %0\n\t" 304 ".chip 68k" : : "m" (*fpstate)); 305 err = 0; 306 307 out: 308 return err; 309 } 310 311 static int mangle_kernel_stack(struct pt_regs *regs, int formatvec, 312 void __user *fp) 313 { 314 int fsize = frame_extra_sizes[formatvec >> 12]; 315 if (fsize < 0) { 316 /* 317 * user process trying to return with weird frame format 318 */ 319 #ifdef DEBUG 320 printk("user process returning with weird frame format\n"); 321 #endif 322 return 1; 323 } 324 if (!fsize) { 325 regs->format = formatvec >> 12; 326 regs->vector = formatvec & 0xfff; 327 } else { 328 struct switch_stack *sw = (struct switch_stack *)regs - 1; 329 unsigned long buf[fsize / 2]; /* yes, twice as much */ 330 331 /* that'll make sure that expansion won't crap over data */ 332 if (copy_from_user(buf + fsize / 4, fp, fsize)) 333 return 1; 334 335 /* point of no return */ 336 regs->format = formatvec >> 12; 337 regs->vector = formatvec & 0xfff; 338 #define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack)) 339 __asm__ __volatile__ 340 (" movel %0,%/a0\n\t" 341 " subl %1,%/a0\n\t" /* make room on stack */ 342 " movel %/a0,%/sp\n\t" /* set stack pointer */ 343 /* move switch_stack and pt_regs */ 344 "1: movel %0@+,%/a0@+\n\t" 345 " dbra %2,1b\n\t" 346 " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */ 347 " lsrl #2,%1\n\t" 348 " subql #1,%1\n\t" 349 /* copy to the gap we'd made */ 350 "2: movel %4@+,%/a0@+\n\t" 351 " dbra %1,2b\n\t" 352 " bral ret_from_signal\n" 353 : /* no outputs, it doesn't ever return */ 354 : "a" (sw), "d" (fsize), "d" (frame_offset/4-1), 355 "n" (frame_offset), "a" (buf + fsize/4) 356 : "a0"); 357 #undef frame_offset 358 } 359 return 0; 360 } 361 362 static inline int 363 restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __user *fp) 364 { 365 int formatvec; 366 struct sigcontext context; 367 int err; 368 369 /* Always make any pending restarted system calls return -EINTR */ 370 current_thread_info()->restart_block.fn = do_no_restart_syscall; 371 372 /* get previous context */ 373 if (copy_from_user(&context, usc, sizeof(context))) 374 goto badframe; 375 376 /* restore passed registers */ 377 regs->d0 = context.sc_d0; 378 regs->d1 = context.sc_d1; 379 regs->a0 = context.sc_a0; 380 regs->a1 = context.sc_a1; 381 regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff); 382 regs->pc = context.sc_pc; 383 regs->orig_d0 = -1; /* disable syscall checks */ 384 wrusp(context.sc_usp); 385 formatvec = context.sc_formatvec; 386 387 err = restore_fpu_state(&context); 388 389 if (err || mangle_kernel_stack(regs, formatvec, fp)) 390 goto badframe; 391 392 return 0; 393 394 badframe: 395 return 1; 396 } 397 398 static inline int 399 rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw, 400 struct ucontext __user *uc) 401 { 402 int temp; 403 greg_t __user *gregs = uc->uc_mcontext.gregs; 404 unsigned long usp; 405 int err; 406 407 /* Always make any pending restarted system calls return -EINTR */ 408 current_thread_info()->restart_block.fn = do_no_restart_syscall; 409 410 err = __get_user(temp, &uc->uc_mcontext.version); 411 if (temp != MCONTEXT_VERSION) 412 goto badframe; 413 /* restore passed registers */ 414 err |= __get_user(regs->d0, &gregs[0]); 415 err |= __get_user(regs->d1, &gregs[1]); 416 err |= __get_user(regs->d2, &gregs[2]); 417 err |= __get_user(regs->d3, &gregs[3]); 418 err |= __get_user(regs->d4, &gregs[4]); 419 err |= __get_user(regs->d5, &gregs[5]); 420 err |= __get_user(sw->d6, &gregs[6]); 421 err |= __get_user(sw->d7, &gregs[7]); 422 err |= __get_user(regs->a0, &gregs[8]); 423 err |= __get_user(regs->a1, &gregs[9]); 424 err |= __get_user(regs->a2, &gregs[10]); 425 err |= __get_user(sw->a3, &gregs[11]); 426 err |= __get_user(sw->a4, &gregs[12]); 427 err |= __get_user(sw->a5, &gregs[13]); 428 err |= __get_user(sw->a6, &gregs[14]); 429 err |= __get_user(usp, &gregs[15]); 430 wrusp(usp); 431 err |= __get_user(regs->pc, &gregs[16]); 432 err |= __get_user(temp, &gregs[17]); 433 regs->sr = (regs->sr & 0xff00) | (temp & 0xff); 434 regs->orig_d0 = -1; /* disable syscall checks */ 435 err |= __get_user(temp, &uc->uc_formatvec); 436 437 err |= rt_restore_fpu_state(uc); 438 439 if (err || do_sigaltstack(&uc->uc_stack, NULL, usp) == -EFAULT) 440 goto badframe; 441 442 if (mangle_kernel_stack(regs, temp, &uc->uc_extra)) 443 goto badframe; 444 445 return 0; 446 447 badframe: 448 return 1; 449 } 450 451 asmlinkage int do_sigreturn(unsigned long __unused) 452 { 453 struct switch_stack *sw = (struct switch_stack *) &__unused; 454 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 455 unsigned long usp = rdusp(); 456 struct sigframe __user *frame = (struct sigframe __user *)(usp - 4); 457 sigset_t set; 458 459 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 460 goto badframe; 461 if (__get_user(set.sig[0], &frame->sc.sc_mask) || 462 (_NSIG_WORDS > 1 && 463 __copy_from_user(&set.sig[1], &frame->extramask, 464 sizeof(frame->extramask)))) 465 goto badframe; 466 467 sigdelsetmask(&set, ~_BLOCKABLE); 468 current->blocked = set; 469 recalc_sigpending(); 470 471 if (restore_sigcontext(regs, &frame->sc, frame + 1)) 472 goto badframe; 473 return regs->d0; 474 475 badframe: 476 force_sig(SIGSEGV, current); 477 return 0; 478 } 479 480 asmlinkage int do_rt_sigreturn(unsigned long __unused) 481 { 482 struct switch_stack *sw = (struct switch_stack *) &__unused; 483 struct pt_regs *regs = (struct pt_regs *) (sw + 1); 484 unsigned long usp = rdusp(); 485 struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4); 486 sigset_t set; 487 488 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 489 goto badframe; 490 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 491 goto badframe; 492 493 sigdelsetmask(&set, ~_BLOCKABLE); 494 current->blocked = set; 495 recalc_sigpending(); 496 497 if (rt_restore_ucontext(regs, sw, &frame->uc)) 498 goto badframe; 499 return regs->d0; 500 501 badframe: 502 force_sig(SIGSEGV, current); 503 return 0; 504 } 505 506 /* 507 * Set up a signal frame. 508 */ 509 510 static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs) 511 { 512 if (FPU_IS_EMU) { 513 /* save registers */ 514 memcpy(sc->sc_fpcntl, current->thread.fpcntl, 12); 515 memcpy(sc->sc_fpregs, current->thread.fp, 24); 516 return; 517 } 518 519 __asm__ volatile (".chip 68k/68881\n\t" 520 "fsave %0\n\t" 521 ".chip 68k" 522 : : "m" (*sc->sc_fpstate) : "memory"); 523 524 if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) { 525 fpu_version = sc->sc_fpstate[0]; 526 if (CPU_IS_020_OR_030 && 527 regs->vector >= (VEC_FPBRUC * 4) && 528 regs->vector <= (VEC_FPNAN * 4)) { 529 /* Clear pending exception in 68882 idle frame */ 530 if (*(unsigned short *) sc->sc_fpstate == 0x1f38) 531 sc->sc_fpstate[0x38] |= 1 << 3; 532 } 533 __asm__ volatile (".chip 68k/68881\n\t" 534 "fmovemx %%fp0-%%fp1,%0\n\t" 535 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 536 ".chip 68k" 537 : "=m" (*sc->sc_fpregs), 538 "=m" (*sc->sc_fpcntl) 539 : /* no inputs */ 540 : "memory"); 541 } 542 } 543 544 static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *regs) 545 { 546 unsigned char fpstate[FPCONTEXT_SIZE]; 547 int context_size = CPU_IS_060 ? 8 : 0; 548 int err = 0; 549 550 if (FPU_IS_EMU) { 551 /* save fpu control register */ 552 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpcntl, 553 current->thread.fpcntl, 12); 554 /* save all other fpu register */ 555 err |= copy_to_user(uc->uc_mcontext.fpregs.f_fpregs, 556 current->thread.fp, 96); 557 return err; 558 } 559 560 __asm__ volatile (".chip 68k/68881\n\t" 561 "fsave %0\n\t" 562 ".chip 68k" 563 : : "m" (*fpstate) : "memory"); 564 565 err |= __put_user(*(long *)fpstate, (long __user *)&uc->uc_fpstate); 566 if (CPU_IS_060 ? fpstate[2] : fpstate[0]) { 567 fpregset_t fpregs; 568 if (!CPU_IS_060) 569 context_size = fpstate[1]; 570 fpu_version = fpstate[0]; 571 if (CPU_IS_020_OR_030 && 572 regs->vector >= (VEC_FPBRUC * 4) && 573 regs->vector <= (VEC_FPNAN * 4)) { 574 /* Clear pending exception in 68882 idle frame */ 575 if (*(unsigned short *) fpstate == 0x1f38) 576 fpstate[0x38] |= 1 << 3; 577 } 578 __asm__ volatile (".chip 68k/68881\n\t" 579 "fmovemx %%fp0-%%fp7,%0\n\t" 580 "fmoveml %%fpcr/%%fpsr/%%fpiar,%1\n\t" 581 ".chip 68k" 582 : "=m" (*fpregs.f_fpregs), 583 "=m" (*fpregs.f_fpcntl) 584 : /* no inputs */ 585 : "memory"); 586 err |= copy_to_user(&uc->uc_mcontext.fpregs, &fpregs, 587 sizeof(fpregs)); 588 } 589 if (context_size) 590 err |= copy_to_user((long __user *)&uc->uc_fpstate + 1, fpstate + 4, 591 context_size); 592 return err; 593 } 594 595 static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs, 596 unsigned long mask) 597 { 598 sc->sc_mask = mask; 599 sc->sc_usp = rdusp(); 600 sc->sc_d0 = regs->d0; 601 sc->sc_d1 = regs->d1; 602 sc->sc_a0 = regs->a0; 603 sc->sc_a1 = regs->a1; 604 sc->sc_sr = regs->sr; 605 sc->sc_pc = regs->pc; 606 sc->sc_formatvec = regs->format << 12 | regs->vector; 607 save_fpu_state(sc, regs); 608 } 609 610 static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs) 611 { 612 struct switch_stack *sw = (struct switch_stack *)regs - 1; 613 greg_t __user *gregs = uc->uc_mcontext.gregs; 614 int err = 0; 615 616 err |= __put_user(MCONTEXT_VERSION, &uc->uc_mcontext.version); 617 err |= __put_user(regs->d0, &gregs[0]); 618 err |= __put_user(regs->d1, &gregs[1]); 619 err |= __put_user(regs->d2, &gregs[2]); 620 err |= __put_user(regs->d3, &gregs[3]); 621 err |= __put_user(regs->d4, &gregs[4]); 622 err |= __put_user(regs->d5, &gregs[5]); 623 err |= __put_user(sw->d6, &gregs[6]); 624 err |= __put_user(sw->d7, &gregs[7]); 625 err |= __put_user(regs->a0, &gregs[8]); 626 err |= __put_user(regs->a1, &gregs[9]); 627 err |= __put_user(regs->a2, &gregs[10]); 628 err |= __put_user(sw->a3, &gregs[11]); 629 err |= __put_user(sw->a4, &gregs[12]); 630 err |= __put_user(sw->a5, &gregs[13]); 631 err |= __put_user(sw->a6, &gregs[14]); 632 err |= __put_user(rdusp(), &gregs[15]); 633 err |= __put_user(regs->pc, &gregs[16]); 634 err |= __put_user(regs->sr, &gregs[17]); 635 err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec); 636 err |= rt_save_fpu_state(uc, regs); 637 return err; 638 } 639 640 static inline void push_cache (unsigned long vaddr) 641 { 642 /* 643 * Using the old cache_push_v() was really a big waste. 644 * 645 * What we are trying to do is to flush 8 bytes to ram. 646 * Flushing 2 cache lines of 16 bytes is much cheaper than 647 * flushing 1 or 2 pages, as previously done in 648 * cache_push_v(). 649 * Jes 650 */ 651 if (CPU_IS_040) { 652 unsigned long temp; 653 654 __asm__ __volatile__ (".chip 68040\n\t" 655 "nop\n\t" 656 "ptestr (%1)\n\t" 657 "movec %%mmusr,%0\n\t" 658 ".chip 68k" 659 : "=r" (temp) 660 : "a" (vaddr)); 661 662 temp &= PAGE_MASK; 663 temp |= vaddr & ~PAGE_MASK; 664 665 __asm__ __volatile__ (".chip 68040\n\t" 666 "nop\n\t" 667 "cpushl %%bc,(%0)\n\t" 668 ".chip 68k" 669 : : "a" (temp)); 670 } 671 else if (CPU_IS_060) { 672 unsigned long temp; 673 __asm__ __volatile__ (".chip 68060\n\t" 674 "plpar (%0)\n\t" 675 ".chip 68k" 676 : "=a" (temp) 677 : "0" (vaddr)); 678 __asm__ __volatile__ (".chip 68060\n\t" 679 "cpushl %%bc,(%0)\n\t" 680 ".chip 68k" 681 : : "a" (temp)); 682 } 683 else { 684 /* 685 * 68030/68020 have no writeback cache; 686 * still need to clear icache. 687 * Note that vaddr is guaranteed to be long word aligned. 688 */ 689 unsigned long temp; 690 asm volatile ("movec %%cacr,%0" : "=r" (temp)); 691 temp += 4; 692 asm volatile ("movec %0,%%caar\n\t" 693 "movec %1,%%cacr" 694 : : "r" (vaddr), "r" (temp)); 695 asm volatile ("movec %0,%%caar\n\t" 696 "movec %1,%%cacr" 697 : : "r" (vaddr + 4), "r" (temp)); 698 } 699 } 700 701 static inline void __user * 702 get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size) 703 { 704 unsigned long usp; 705 706 /* Default to using normal stack. */ 707 usp = rdusp(); 708 709 /* This is the X/Open sanctioned signal stack switching. */ 710 if (ka->sa.sa_flags & SA_ONSTACK) { 711 if (!sas_ss_flags(usp)) 712 usp = current->sas_ss_sp + current->sas_ss_size; 713 } 714 return (void __user *)((usp - frame_size) & -8UL); 715 } 716 717 static int setup_frame (int sig, struct k_sigaction *ka, 718 sigset_t *set, struct pt_regs *regs) 719 { 720 struct sigframe __user *frame; 721 int fsize = frame_extra_sizes[regs->format]; 722 struct sigcontext context; 723 int err = 0; 724 725 if (fsize < 0) { 726 #ifdef DEBUG 727 printk ("setup_frame: Unknown frame format %#x\n", 728 regs->format); 729 #endif 730 goto give_sigsegv; 731 } 732 733 frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); 734 735 if (fsize) 736 err |= copy_to_user (frame + 1, regs + 1, fsize); 737 738 err |= __put_user((current_thread_info()->exec_domain 739 && current_thread_info()->exec_domain->signal_invmap 740 && sig < 32 741 ? current_thread_info()->exec_domain->signal_invmap[sig] 742 : sig), 743 &frame->sig); 744 745 err |= __put_user(regs->vector, &frame->code); 746 err |= __put_user(&frame->sc, &frame->psc); 747 748 if (_NSIG_WORDS > 1) 749 err |= copy_to_user(frame->extramask, &set->sig[1], 750 sizeof(frame->extramask)); 751 752 setup_sigcontext(&context, regs, set->sig[0]); 753 err |= copy_to_user (&frame->sc, &context, sizeof(context)); 754 755 /* Set up to return from userspace. */ 756 err |= __put_user(frame->retcode, &frame->pretcode); 757 /* moveq #,d0; trap #0 */ 758 err |= __put_user(0x70004e40 + (__NR_sigreturn << 16), 759 (long __user *)(frame->retcode)); 760 761 if (err) 762 goto give_sigsegv; 763 764 push_cache ((unsigned long) &frame->retcode); 765 766 /* 767 * Set up registers for signal handler. All the state we are about 768 * to destroy is successfully copied to sigframe. 769 */ 770 wrusp ((unsigned long) frame); 771 regs->pc = (unsigned long) ka->sa.sa_handler; 772 773 /* 774 * This is subtle; if we build more than one sigframe, all but the 775 * first one will see frame format 0 and have fsize == 0, so we won't 776 * screw stkadj. 777 */ 778 if (fsize) 779 regs->stkadj = fsize; 780 781 /* Prepare to skip over the extra stuff in the exception frame. */ 782 if (regs->stkadj) { 783 struct pt_regs *tregs = 784 (struct pt_regs *)((ulong)regs + regs->stkadj); 785 #ifdef DEBUG 786 printk("Performing stackadjust=%04x\n", regs->stkadj); 787 #endif 788 /* This must be copied with decreasing addresses to 789 handle overlaps. */ 790 tregs->vector = 0; 791 tregs->format = 0; 792 tregs->pc = regs->pc; 793 tregs->sr = regs->sr; 794 } 795 return 0; 796 797 give_sigsegv: 798 force_sigsegv(sig, current); 799 return err; 800 } 801 802 static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, 803 sigset_t *set, struct pt_regs *regs) 804 { 805 struct rt_sigframe __user *frame; 806 int fsize = frame_extra_sizes[regs->format]; 807 int err = 0; 808 809 if (fsize < 0) { 810 #ifdef DEBUG 811 printk ("setup_frame: Unknown frame format %#x\n", 812 regs->format); 813 #endif 814 goto give_sigsegv; 815 } 816 817 frame = get_sigframe(ka, regs, sizeof(*frame)); 818 819 if (fsize) 820 err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); 821 822 err |= __put_user((current_thread_info()->exec_domain 823 && current_thread_info()->exec_domain->signal_invmap 824 && sig < 32 825 ? current_thread_info()->exec_domain->signal_invmap[sig] 826 : sig), 827 &frame->sig); 828 err |= __put_user(&frame->info, &frame->pinfo); 829 err |= __put_user(&frame->uc, &frame->puc); 830 err |= copy_siginfo_to_user(&frame->info, info); 831 832 /* Create the ucontext. */ 833 err |= __put_user(0, &frame->uc.uc_flags); 834 err |= __put_user(NULL, &frame->uc.uc_link); 835 err |= __put_user((void __user *)current->sas_ss_sp, 836 &frame->uc.uc_stack.ss_sp); 837 err |= __put_user(sas_ss_flags(rdusp()), 838 &frame->uc.uc_stack.ss_flags); 839 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); 840 err |= rt_setup_ucontext(&frame->uc, regs); 841 err |= copy_to_user (&frame->uc.uc_sigmask, set, sizeof(*set)); 842 843 /* Set up to return from userspace. */ 844 err |= __put_user(frame->retcode, &frame->pretcode); 845 #ifdef __mcoldfire__ 846 /* movel #__NR_rt_sigreturn,d0; trap #0 */ 847 err |= __put_user(0x203c0000, (long __user *)(frame->retcode + 0)); 848 err |= __put_user(0x00004e40 + (__NR_rt_sigreturn << 16), 849 (long __user *)(frame->retcode + 4)); 850 #else 851 /* moveq #,d0; notb d0; trap #0 */ 852 err |= __put_user(0x70004600 + ((__NR_rt_sigreturn ^ 0xff) << 16), 853 (long __user *)(frame->retcode + 0)); 854 err |= __put_user(0x4e40, (short __user *)(frame->retcode + 4)); 855 #endif 856 857 if (err) 858 goto give_sigsegv; 859 860 push_cache ((unsigned long) &frame->retcode); 861 862 /* 863 * Set up registers for signal handler. All the state we are about 864 * to destroy is successfully copied to sigframe. 865 */ 866 wrusp ((unsigned long) frame); 867 regs->pc = (unsigned long) ka->sa.sa_handler; 868 869 /* 870 * This is subtle; if we build more than one sigframe, all but the 871 * first one will see frame format 0 and have fsize == 0, so we won't 872 * screw stkadj. 873 */ 874 if (fsize) 875 regs->stkadj = fsize; 876 877 /* Prepare to skip over the extra stuff in the exception frame. */ 878 if (regs->stkadj) { 879 struct pt_regs *tregs = 880 (struct pt_regs *)((ulong)regs + regs->stkadj); 881 #ifdef DEBUG 882 printk("Performing stackadjust=%04x\n", regs->stkadj); 883 #endif 884 /* This must be copied with decreasing addresses to 885 handle overlaps. */ 886 tregs->vector = 0; 887 tregs->format = 0; 888 tregs->pc = regs->pc; 889 tregs->sr = regs->sr; 890 } 891 return 0; 892 893 give_sigsegv: 894 force_sigsegv(sig, current); 895 return err; 896 } 897 898 static inline void 899 handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler) 900 { 901 switch (regs->d0) { 902 case -ERESTARTNOHAND: 903 if (!has_handler) 904 goto do_restart; 905 regs->d0 = -EINTR; 906 break; 907 908 case -ERESTART_RESTARTBLOCK: 909 if (!has_handler) { 910 regs->d0 = __NR_restart_syscall; 911 regs->pc -= 2; 912 break; 913 } 914 regs->d0 = -EINTR; 915 break; 916 917 case -ERESTARTSYS: 918 if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) { 919 regs->d0 = -EINTR; 920 break; 921 } 922 /* fallthrough */ 923 case -ERESTARTNOINTR: 924 do_restart: 925 regs->d0 = regs->orig_d0; 926 regs->pc -= 2; 927 break; 928 } 929 } 930 931 void ptrace_signal_deliver(struct pt_regs *regs, void *cookie) 932 { 933 if (regs->orig_d0 < 0) 934 return; 935 switch (regs->d0) { 936 case -ERESTARTNOHAND: 937 case -ERESTARTSYS: 938 case -ERESTARTNOINTR: 939 regs->d0 = regs->orig_d0; 940 regs->orig_d0 = -1; 941 regs->pc -= 2; 942 break; 943 } 944 } 945 946 /* 947 * OK, we're invoking a handler 948 */ 949 static void 950 handle_signal(int sig, struct k_sigaction *ka, siginfo_t *info, 951 sigset_t *oldset, struct pt_regs *regs) 952 { 953 int err; 954 /* are we from a system call? */ 955 if (regs->orig_d0 >= 0) 956 /* If so, check system call restarting.. */ 957 handle_restart(regs, ka, 1); 958 959 /* set up the stack frame */ 960 if (ka->sa.sa_flags & SA_SIGINFO) 961 err = setup_rt_frame(sig, ka, info, oldset, regs); 962 else 963 err = setup_frame(sig, ka, oldset, regs); 964 965 if (err) 966 return; 967 968 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 969 if (!(ka->sa.sa_flags & SA_NODEFER)) 970 sigaddset(¤t->blocked,sig); 971 recalc_sigpending(); 972 973 if (test_thread_flag(TIF_DELAYED_TRACE)) { 974 regs->sr &= ~0x8000; 975 send_sig(SIGTRAP, current, 1); 976 } 977 978 clear_thread_flag(TIF_RESTORE_SIGMASK); 979 } 980 981 /* 982 * Note that 'init' is a special process: it doesn't get signals it doesn't 983 * want to handle. Thus you cannot kill init even with a SIGKILL even by 984 * mistake. 985 */ 986 asmlinkage void do_signal(struct pt_regs *regs) 987 { 988 siginfo_t info; 989 struct k_sigaction ka; 990 int signr; 991 sigset_t *oldset; 992 993 current->thread.esp0 = (unsigned long) regs; 994 995 if (test_thread_flag(TIF_RESTORE_SIGMASK)) 996 oldset = ¤t->saved_sigmask; 997 else 998 oldset = ¤t->blocked; 999 1000 signr = get_signal_to_deliver(&info, &ka, regs, NULL); 1001 if (signr > 0) { 1002 /* Whee! Actually deliver the signal. */ 1003 handle_signal(signr, &ka, &info, oldset, regs); 1004 return; 1005 } 1006 1007 /* Did we come from a system call? */ 1008 if (regs->orig_d0 >= 0) 1009 /* Restart the system call - no handlers present */ 1010 handle_restart(regs, NULL, 0); 1011 1012 /* If there's no signal to deliver, we just restore the saved mask. */ 1013 if (test_thread_flag(TIF_RESTORE_SIGMASK)) { 1014 clear_thread_flag(TIF_RESTORE_SIGMASK); 1015 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 1016 } 1017 } 1018