1/* 2 * arch/sh/kernel/signal_64.c 3 * 4 * Copyright (C) 2000, 2001 Paolo Alberelli 5 * Copyright (C) 2003 - 2008 Paul Mundt 6 * Copyright (C) 2004 Richard Curnow 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file "COPYING" in the main directory of this archive 10 * for more details. 11 */ 12#include <linux/rwsem.h> 13#include <linux/sched.h> 14#include <linux/mm.h> 15#include <linux/smp.h> 16#include <linux/kernel.h> 17#include <linux/signal.h> 18#include <linux/errno.h> 19#include <linux/wait.h> 20#include <linux/personality.h> 21#include <linux/freezer.h> 22#include <linux/ptrace.h> 23#include <linux/unistd.h> 24#include <linux/stddef.h> 25#include <linux/tracehook.h> 26#include <asm/ucontext.h> 27#include <asm/uaccess.h> 28#include <asm/pgtable.h> 29#include <asm/cacheflush.h> 30#include <asm/fpu.h> 31 32#define REG_RET 9 33#define REG_ARG1 2 34#define REG_ARG2 3 35#define REG_ARG3 4 36#define REG_SP 15 37#define REG_PR 18 38#define REF_REG_RET regs->regs[REG_RET] 39#define REF_REG_SP regs->regs[REG_SP] 40#define DEREF_REG_PR regs->regs[REG_PR] 41 42#define DEBUG_SIG 0 43 44#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) 45 46static int 47handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, 48 sigset_t *oldset, struct pt_regs * regs); 49 50static inline void 51handle_syscall_restart(struct pt_regs *regs, struct sigaction *sa) 52{ 53 /* If we're not from a syscall, bail out */ 54 if (regs->syscall_nr < 0) 55 return; 56 57 /* check for system call restart.. */ 58 switch (regs->regs[REG_RET]) { 59 case -ERESTART_RESTARTBLOCK: 60 case -ERESTARTNOHAND: 61 no_system_call_restart: 62 regs->regs[REG_RET] = -EINTR; 63 break; 64 65 case -ERESTARTSYS: 66 if (!(sa->sa_flags & SA_RESTART)) 67 goto no_system_call_restart; 68 /* fallthrough */ 69 case -ERESTARTNOINTR: 70 /* Decode syscall # */ 71 regs->regs[REG_RET] = regs->syscall_nr; 72 regs->pc -= 4; 73 break; 74 } 75} 76 77/* 78 * Note that 'init' is a special process: it doesn't get signals it doesn't 79 * want to handle. Thus you cannot kill init even with a SIGKILL even by 80 * mistake. 81 * 82 * Note that we go through the signals twice: once to check the signals that 83 * the kernel can handle, and then we build all the user-level signal handling 84 * stack-frames in one go after that. 85 */ 86static int do_signal(struct pt_regs *regs, sigset_t *oldset) 87{ 88 siginfo_t info; 89 int signr; 90 struct k_sigaction ka; 91 92 /* 93 * We want the common case to go fast, which 94 * is why we may in certain cases get here from 95 * kernel mode. Just return without doing anything 96 * if so. 97 */ 98 if (!user_mode(regs)) 99 return 1; 100 101 if (try_to_freeze()) 102 goto no_signal; 103 104 if (current_thread_info()->status & TS_RESTORE_SIGMASK) 105 oldset = ¤t->saved_sigmask; 106 else if (!oldset) 107 oldset = ¤t->blocked; 108 109 signr = get_signal_to_deliver(&info, &ka, regs, 0); 110 if (signr > 0) { 111 handle_syscall_restart(regs, &ka.sa); 112 113 /* Whee! Actually deliver the signal. */ 114 if (handle_signal(signr, &info, &ka, oldset, regs) == 0) { 115 /* 116 * If a signal was successfully delivered, the 117 * saved sigmask is in its frame, and we can 118 * clear the TS_RESTORE_SIGMASK flag. 119 */ 120 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 121 122 tracehook_signal_handler(signr, &info, &ka, regs, 123 test_thread_flag(TIF_SINGLESTEP)); 124 return 1; 125 } 126 } 127 128no_signal: 129 /* Did we come from a system call? */ 130 if (regs->syscall_nr >= 0) { 131 /* Restart the system call - no handlers present */ 132 switch (regs->regs[REG_RET]) { 133 case -ERESTARTNOHAND: 134 case -ERESTARTSYS: 135 case -ERESTARTNOINTR: 136 /* Decode Syscall # */ 137 regs->regs[REG_RET] = regs->syscall_nr; 138 regs->pc -= 4; 139 break; 140 141 case -ERESTART_RESTARTBLOCK: 142 regs->regs[REG_RET] = __NR_restart_syscall; 143 regs->pc -= 4; 144 break; 145 } 146 } 147 148 /* No signal to deliver -- put the saved sigmask back */ 149 if (current_thread_info()->status & TS_RESTORE_SIGMASK) { 150 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 151 sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); 152 } 153 154 return 0; 155} 156 157/* 158 * Atomically swap in the new signal mask, and wait for a signal. 159 */ 160asmlinkage int 161sys_sigsuspend(old_sigset_t mask, 162 unsigned long r3, unsigned long r4, unsigned long r5, 163 unsigned long r6, unsigned long r7, 164 struct pt_regs * regs) 165{ 166 sigset_t saveset; 167 168 mask &= _BLOCKABLE; 169 spin_lock_irq(¤t->sighand->siglock); 170 saveset = current->blocked; 171 siginitset(¤t->blocked, mask); 172 recalc_sigpending(); 173 spin_unlock_irq(¤t->sighand->siglock); 174 175 REF_REG_RET = -EINTR; 176 while (1) { 177 current->state = TASK_INTERRUPTIBLE; 178 schedule(); 179 set_restore_sigmask(); 180 regs->pc += 4; /* because sys_sigreturn decrements the pc */ 181 if (do_signal(regs, &saveset)) { 182 /* pc now points at signal handler. Need to decrement 183 it because entry.S will increment it. */ 184 regs->pc -= 4; 185 return -EINTR; 186 } 187 } 188} 189 190asmlinkage int 191sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize, 192 unsigned long r4, unsigned long r5, unsigned long r6, 193 unsigned long r7, 194 struct pt_regs * regs) 195{ 196 sigset_t saveset, newset; 197 198 if (sigsetsize != sizeof(sigset_t)) 199 return -EINVAL; 200 201 if (copy_from_user(&newset, unewset, sizeof(newset))) 202 return -EFAULT; 203 sigdelsetmask(&newset, ~_BLOCKABLE); 204 spin_lock_irq(¤t->sighand->siglock); 205 saveset = current->blocked; 206 current->blocked = newset; 207 recalc_sigpending(); 208 spin_unlock_irq(¤t->sighand->siglock); 209 210 REF_REG_RET = -EINTR; 211 while (1) { 212 current->state = TASK_INTERRUPTIBLE; 213 schedule(); 214 regs->pc += 4; /* because sys_sigreturn decrements the pc */ 215 if (do_signal(regs, &saveset)) { 216 /* pc now points at signal handler. Need to decrement 217 it because entry.S will increment it. */ 218 regs->pc -= 4; 219 return -EINTR; 220 } 221 } 222} 223 224asmlinkage int 225sys_sigaction(int sig, const struct old_sigaction __user *act, 226 struct old_sigaction __user *oact) 227{ 228 struct k_sigaction new_ka, old_ka; 229 int ret; 230 231 if (act) { 232 old_sigset_t mask; 233 if (!access_ok(VERIFY_READ, act, sizeof(*act)) || 234 __get_user(new_ka.sa.sa_handler, &act->sa_handler) || 235 __get_user(new_ka.sa.sa_restorer, &act->sa_restorer)) 236 return -EFAULT; 237 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 238 __get_user(mask, &act->sa_mask); 239 siginitset(&new_ka.sa.sa_mask, mask); 240 } 241 242 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); 243 244 if (!ret && oact) { 245 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) || 246 __put_user(old_ka.sa.sa_handler, &oact->sa_handler) || 247 __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer)) 248 return -EFAULT; 249 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 250 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 251 } 252 253 return ret; 254} 255 256asmlinkage int 257sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, 258 unsigned long r4, unsigned long r5, unsigned long r6, 259 unsigned long r7, 260 struct pt_regs * regs) 261{ 262 return do_sigaltstack(uss, uoss, REF_REG_SP); 263} 264 265/* 266 * Do a signal return; undo the signal stack. 267 */ 268struct sigframe { 269 struct sigcontext sc; 270 unsigned long extramask[_NSIG_WORDS-1]; 271 long long retcode[2]; 272}; 273 274struct rt_sigframe { 275 struct siginfo __user *pinfo; 276 void *puc; 277 struct siginfo info; 278 struct ucontext uc; 279 long long retcode[2]; 280}; 281 282#ifdef CONFIG_SH_FPU 283static inline int 284restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) 285{ 286 int err = 0; 287 int fpvalid; 288 289 err |= __get_user (fpvalid, &sc->sc_fpvalid); 290 conditional_used_math(fpvalid); 291 if (! fpvalid) 292 return err; 293 294 if (current == last_task_used_math) { 295 last_task_used_math = NULL; 296 regs->sr |= SR_FD; 297 } 298 299 err |= __copy_from_user(¤t->thread.xstate->hardfpu, &sc->sc_fpregs[0], 300 (sizeof(long long) * 32) + (sizeof(int) * 1)); 301 302 return err; 303} 304 305static inline int 306setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) 307{ 308 int err = 0; 309 int fpvalid; 310 311 fpvalid = !!used_math(); 312 err |= __put_user(fpvalid, &sc->sc_fpvalid); 313 if (! fpvalid) 314 return err; 315 316 if (current == last_task_used_math) { 317 enable_fpu(); 318 save_fpu(current); 319 disable_fpu(); 320 last_task_used_math = NULL; 321 regs->sr |= SR_FD; 322 } 323 324 err |= __copy_to_user(&sc->sc_fpregs[0], ¤t->thread.xstate->hardfpu, 325 (sizeof(long long) * 32) + (sizeof(int) * 1)); 326 clear_used_math(); 327 328 return err; 329} 330#else 331static inline int 332restore_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) 333{ 334 return 0; 335} 336static inline int 337setup_sigcontext_fpu(struct pt_regs *regs, struct sigcontext __user *sc) 338{ 339 return 0; 340} 341#endif 342 343static int 344restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, long long *r2_p) 345{ 346 unsigned int err = 0; 347 unsigned long long current_sr, new_sr; 348#define SR_MASK 0xffff8cfd 349 350#define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) 351 352 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); 353 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); 354 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); 355 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); 356 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); 357 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); 358 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); 359 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); 360 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); 361 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); 362 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); 363 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); 364 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); 365 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); 366 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); 367 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); 368 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); 369 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); 370 371 /* Prevent the signal handler manipulating SR in a way that can 372 crash the kernel. i.e. only allow S, Q, M, PR, SZ, FR to be 373 modified */ 374 current_sr = regs->sr; 375 err |= __get_user(new_sr, &sc->sc_sr); 376 regs->sr &= SR_MASK; 377 regs->sr |= (new_sr & ~SR_MASK); 378 379 COPY(pc); 380 381#undef COPY 382 383 /* Must do this last in case it sets regs->sr.fd (i.e. after rest of sr 384 * has been restored above.) */ 385 err |= restore_sigcontext_fpu(regs, sc); 386 387 regs->syscall_nr = -1; /* disable syscall checks */ 388 err |= __get_user(*r2_p, &sc->sc_regs[REG_RET]); 389 return err; 390} 391 392asmlinkage int sys_sigreturn(unsigned long r2, unsigned long r3, 393 unsigned long r4, unsigned long r5, 394 unsigned long r6, unsigned long r7, 395 struct pt_regs * regs) 396{ 397 struct sigframe __user *frame = (struct sigframe __user *) (long) REF_REG_SP; 398 sigset_t set; 399 long long ret; 400 401 /* Always make any pending restarted system calls return -EINTR */ 402 current_thread_info()->restart_block.fn = do_no_restart_syscall; 403 404 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 405 goto badframe; 406 407 if (__get_user(set.sig[0], &frame->sc.oldmask) 408 || (_NSIG_WORDS > 1 409 && __copy_from_user(&set.sig[1], &frame->extramask, 410 sizeof(frame->extramask)))) 411 goto badframe; 412 413 sigdelsetmask(&set, ~_BLOCKABLE); 414 415 spin_lock_irq(¤t->sighand->siglock); 416 current->blocked = set; 417 recalc_sigpending(); 418 spin_unlock_irq(¤t->sighand->siglock); 419 420 if (restore_sigcontext(regs, &frame->sc, &ret)) 421 goto badframe; 422 regs->pc -= 4; 423 424 return (int) ret; 425 426badframe: 427 force_sig(SIGSEGV, current); 428 return 0; 429} 430 431asmlinkage int sys_rt_sigreturn(unsigned long r2, unsigned long r3, 432 unsigned long r4, unsigned long r5, 433 unsigned long r6, unsigned long r7, 434 struct pt_regs * regs) 435{ 436 struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (long) REF_REG_SP; 437 sigset_t set; 438 stack_t __user st; 439 long long ret; 440 441 /* Always make any pending restarted system calls return -EINTR */ 442 current_thread_info()->restart_block.fn = do_no_restart_syscall; 443 444 if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) 445 goto badframe; 446 447 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) 448 goto badframe; 449 450 sigdelsetmask(&set, ~_BLOCKABLE); 451 spin_lock_irq(¤t->sighand->siglock); 452 current->blocked = set; 453 recalc_sigpending(); 454 spin_unlock_irq(¤t->sighand->siglock); 455 456 if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &ret)) 457 goto badframe; 458 regs->pc -= 4; 459 460 if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st))) 461 goto badframe; 462 /* It is more difficult to avoid calling this function than to 463 call it and ignore errors. */ 464 do_sigaltstack(&st, NULL, REF_REG_SP); 465 466 return (int) ret; 467 468badframe: 469 force_sig(SIGSEGV, current); 470 return 0; 471} 472 473/* 474 * Set up a signal frame. 475 */ 476static int 477setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, 478 unsigned long mask) 479{ 480 int err = 0; 481 482 /* Do this first, otherwise is this sets sr->fd, that value isn't preserved. */ 483 err |= setup_sigcontext_fpu(regs, sc); 484 485#define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) 486 487 COPY(regs[0]); COPY(regs[1]); COPY(regs[2]); COPY(regs[3]); 488 COPY(regs[4]); COPY(regs[5]); COPY(regs[6]); COPY(regs[7]); 489 COPY(regs[8]); COPY(regs[9]); COPY(regs[10]); COPY(regs[11]); 490 COPY(regs[12]); COPY(regs[13]); COPY(regs[14]); COPY(regs[15]); 491 COPY(regs[16]); COPY(regs[17]); COPY(regs[18]); COPY(regs[19]); 492 COPY(regs[20]); COPY(regs[21]); COPY(regs[22]); COPY(regs[23]); 493 COPY(regs[24]); COPY(regs[25]); COPY(regs[26]); COPY(regs[27]); 494 COPY(regs[28]); COPY(regs[29]); COPY(regs[30]); COPY(regs[31]); 495 COPY(regs[32]); COPY(regs[33]); COPY(regs[34]); COPY(regs[35]); 496 COPY(regs[36]); COPY(regs[37]); COPY(regs[38]); COPY(regs[39]); 497 COPY(regs[40]); COPY(regs[41]); COPY(regs[42]); COPY(regs[43]); 498 COPY(regs[44]); COPY(regs[45]); COPY(regs[46]); COPY(regs[47]); 499 COPY(regs[48]); COPY(regs[49]); COPY(regs[50]); COPY(regs[51]); 500 COPY(regs[52]); COPY(regs[53]); COPY(regs[54]); COPY(regs[55]); 501 COPY(regs[56]); COPY(regs[57]); COPY(regs[58]); COPY(regs[59]); 502 COPY(regs[60]); COPY(regs[61]); COPY(regs[62]); 503 COPY(tregs[0]); COPY(tregs[1]); COPY(tregs[2]); COPY(tregs[3]); 504 COPY(tregs[4]); COPY(tregs[5]); COPY(tregs[6]); COPY(tregs[7]); 505 COPY(sr); COPY(pc); 506 507#undef COPY 508 509 err |= __put_user(mask, &sc->oldmask); 510 511 return err; 512} 513 514/* 515 * Determine which stack to use.. 516 */ 517static inline void __user * 518get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) 519{ 520 if ((ka->sa.sa_flags & SA_ONSTACK) != 0 && ! sas_ss_flags(sp)) 521 sp = current->sas_ss_sp + current->sas_ss_size; 522 523 return (void __user *)((sp - frame_size) & -8ul); 524} 525 526void sa_default_restorer(void); /* See comments below */ 527void sa_default_rt_restorer(void); /* See comments below */ 528 529static int setup_frame(int sig, struct k_sigaction *ka, 530 sigset_t *set, struct pt_regs *regs) 531{ 532 struct sigframe __user *frame; 533 int err = 0; 534 int signal; 535 536 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); 537 538 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) 539 goto give_sigsegv; 540 541 signal = current_thread_info()->exec_domain 542 && current_thread_info()->exec_domain->signal_invmap 543 && sig < 32 544 ? current_thread_info()->exec_domain->signal_invmap[sig] 545 : sig; 546 547 err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); 548 549 /* Give up earlier as i386, in case */ 550 if (err) 551 goto give_sigsegv; 552 553 if (_NSIG_WORDS > 1) { 554 err |= __copy_to_user(frame->extramask, &set->sig[1], 555 sizeof(frame->extramask)); } 556 557 /* Give up earlier as i386, in case */ 558 if (err) 559 goto give_sigsegv; 560 561 /* Set up to return from userspace. If provided, use a stub 562 already in userspace. */ 563 if (ka->sa.sa_flags & SA_RESTORER) { 564 /* 565 * On SH5 all edited pointers are subject to NEFF 566 */ 567 DEREF_REG_PR = neff_sign_extend((unsigned long) 568 ka->sa.sa_restorer | 0x1); 569 } else { 570 /* 571 * Different approach on SH5. 572 * . Endianness independent asm code gets placed in entry.S . 573 * This is limited to four ASM instructions corresponding 574 * to two long longs in size. 575 * . err checking is done on the else branch only 576 * . flush_icache_range() is called upon __put_user() only 577 * . all edited pointers are subject to NEFF 578 * . being code, linker turns ShMedia bit on, always 579 * dereference index -1. 580 */ 581 DEREF_REG_PR = neff_sign_extend((unsigned long) 582 frame->retcode | 0x01); 583 584 if (__copy_to_user(frame->retcode, 585 (void *)((unsigned long)sa_default_restorer & (~1)), 16) != 0) 586 goto give_sigsegv; 587 588 /* Cohere the trampoline with the I-cache. */ 589 flush_cache_sigtramp(DEREF_REG_PR-1); 590 } 591 592 /* 593 * Set up registers for signal handler. 594 * All edited pointers are subject to NEFF. 595 */ 596 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); 597 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ 598 599 600 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->sc; 601 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->sc; 602 603 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler); 604 605 set_fs(USER_DS); 606 607 /* Broken %016Lx */ 608 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", 609 signal, current->comm, current->pid, frame, 610 regs->pc >> 32, regs->pc & 0xffffffff, 611 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); 612 613 return 0; 614 615give_sigsegv: 616 force_sigsegv(sig, current); 617 return -EFAULT; 618} 619 620static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, 621 sigset_t *set, struct pt_regs *regs) 622{ 623 struct rt_sigframe __user *frame; 624 int err = 0; 625 int signal; 626 627 frame = get_sigframe(ka, regs->regs[REG_SP], sizeof(*frame)); 628 629 if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) 630 goto give_sigsegv; 631 632 signal = current_thread_info()->exec_domain 633 && current_thread_info()->exec_domain->signal_invmap 634 && sig < 32 635 ? current_thread_info()->exec_domain->signal_invmap[sig] 636 : sig; 637 638 err |= __put_user(&frame->info, &frame->pinfo); 639 err |= __put_user(&frame->uc, &frame->puc); 640 err |= copy_siginfo_to_user(&frame->info, info); 641 642 /* Give up earlier as i386, in case */ 643 if (err) 644 goto give_sigsegv; 645 646 /* Create the ucontext. */ 647 err |= __put_user(0, &frame->uc.uc_flags); 648 err |= __put_user(0, &frame->uc.uc_link); 649 err |= __put_user((void *)current->sas_ss_sp, 650 &frame->uc.uc_stack.ss_sp); 651 err |= __put_user(sas_ss_flags(regs->regs[REG_SP]), 652 &frame->uc.uc_stack.ss_flags); 653 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size); 654 err |= setup_sigcontext(&frame->uc.uc_mcontext, 655 regs, set->sig[0]); 656 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); 657 658 /* Give up earlier as i386, in case */ 659 if (err) 660 goto give_sigsegv; 661 662 /* Set up to return from userspace. If provided, use a stub 663 already in userspace. */ 664 if (ka->sa.sa_flags & SA_RESTORER) { 665 /* 666 * On SH5 all edited pointers are subject to NEFF 667 */ 668 DEREF_REG_PR = neff_sign_extend((unsigned long) 669 ka->sa.sa_restorer | 0x1); 670 } else { 671 /* 672 * Different approach on SH5. 673 * . Endianness independent asm code gets placed in entry.S . 674 * This is limited to four ASM instructions corresponding 675 * to two long longs in size. 676 * . err checking is done on the else branch only 677 * . flush_icache_range() is called upon __put_user() only 678 * . all edited pointers are subject to NEFF 679 * . being code, linker turns ShMedia bit on, always 680 * dereference index -1. 681 */ 682 DEREF_REG_PR = neff_sign_extend((unsigned long) 683 frame->retcode | 0x01); 684 685 if (__copy_to_user(frame->retcode, 686 (void *)((unsigned long)sa_default_rt_restorer & (~1)), 16) != 0) 687 goto give_sigsegv; 688 689 /* Cohere the trampoline with the I-cache. */ 690 flush_icache_range(DEREF_REG_PR-1, DEREF_REG_PR-1+15); 691 } 692 693 /* 694 * Set up registers for signal handler. 695 * All edited pointers are subject to NEFF. 696 */ 697 regs->regs[REG_SP] = neff_sign_extend((unsigned long)frame); 698 regs->regs[REG_ARG1] = signal; /* Arg for signal handler */ 699 regs->regs[REG_ARG2] = (unsigned long long)(unsigned long)(signed long)&frame->info; 700 regs->regs[REG_ARG3] = (unsigned long long)(unsigned long)(signed long)&frame->uc.uc_mcontext; 701 regs->pc = neff_sign_extend((unsigned long)ka->sa.sa_handler); 702 703 set_fs(USER_DS); 704 705 pr_debug("SIG deliver (#%d,%s:%d): sp=%p pc=%08Lx%08Lx link=%08Lx%08Lx\n", 706 signal, current->comm, current->pid, frame, 707 regs->pc >> 32, regs->pc & 0xffffffff, 708 DEREF_REG_PR >> 32, DEREF_REG_PR & 0xffffffff); 709 710 return 0; 711 712give_sigsegv: 713 force_sigsegv(sig, current); 714 return -EFAULT; 715} 716 717/* 718 * OK, we're invoking a handler 719 */ 720static int 721handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, 722 sigset_t *oldset, struct pt_regs * regs) 723{ 724 int ret; 725 726 /* Set up the stack frame */ 727 if (ka->sa.sa_flags & SA_SIGINFO) 728 ret = setup_rt_frame(sig, ka, info, oldset, regs); 729 else 730 ret = setup_frame(sig, ka, oldset, regs); 731 732 if (ka->sa.sa_flags & SA_ONESHOT) 733 ka->sa.sa_handler = SIG_DFL; 734 735 if (ret == 0) { 736 spin_lock_irq(¤t->sighand->siglock); 737 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask); 738 if (!(ka->sa.sa_flags & SA_NODEFER)) 739 sigaddset(¤t->blocked,sig); 740 recalc_sigpending(); 741 spin_unlock_irq(¤t->sighand->siglock); 742 } 743 744 return ret; 745} 746 747asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags) 748{ 749 if (thread_info_flags & _TIF_SIGPENDING) 750 do_signal(regs, 0); 751 752 if (thread_info_flags & _TIF_NOTIFY_RESUME) { 753 clear_thread_flag(TIF_NOTIFY_RESUME); 754 tracehook_notify_resume(regs); 755 if (current->replacement_session_keyring) 756 key_replace_session_keyring(); 757 } 758} 759