| 1 | /* |
| 2 | * linux/arch/sh/kernel/signal.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * |
| 6 | * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson |
| 7 | * |
| 8 | * SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima |
| 9 | * |
| 10 | */ |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/smp.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/signal.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/wait.h> |
| 18 | #include <linux/ptrace.h> |
| 19 | #include <linux/unistd.h> |
| 20 | #include <linux/stddef.h> |
| 21 | #include <linux/tty.h> |
| 22 | #include <linux/elf.h> |
| 23 | #include <linux/personality.h> |
| 24 | #include <linux/binfmts.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/tracehook.h> |
| 27 | #include <asm/ucontext.h> |
| 28 | #include <asm/uaccess.h> |
| 29 | #include <asm/pgtable.h> |
| 30 | #include <asm/cacheflush.h> |
| 31 | #include <asm/syscalls.h> |
| 32 | #include <asm/fpu.h> |
| 33 | |
| 34 | struct fdpic_func_descriptor { |
| 35 | unsigned long text; |
| 36 | unsigned long GOT; |
| 37 | }; |
| 38 | |
| 39 | /* |
| 40 | * The following define adds a 64 byte gap between the signal |
| 41 | * stack frame and previous contents of the stack. This allows |
| 42 | * frame unwinding in a function epilogue but only if a frame |
| 43 | * pointer is used in the function. This is necessary because |
| 44 | * current gcc compilers (<4.3) do not generate unwind info on |
| 45 | * SH for function epilogues. |
| 46 | */ |
| 47 | #define UNWINDGUARD 64 |
| 48 | |
| 49 | /* |
| 50 | * Do a signal return; undo the signal stack. |
| 51 | */ |
| 52 | |
| 53 | #define MOVW(n) (0x9300|((n)-2)) /* Move mem word at PC+n to R3 */ |
| 54 | #if defined(CONFIG_CPU_SH2) |
| 55 | #define TRAP_NOARG 0xc320 /* Syscall w/no args (NR in R3) */ |
| 56 | #else |
| 57 | #define TRAP_NOARG 0xc310 /* Syscall w/no args (NR in R3) */ |
| 58 | #endif |
| 59 | #define OR_R0_R0 0x200b /* or r0,r0 (insert to avoid hardware bug) */ |
| 60 | |
| 61 | struct sigframe |
| 62 | { |
| 63 | struct sigcontext sc; |
| 64 | unsigned long extramask[_NSIG_WORDS-1]; |
| 65 | u16 retcode[8]; |
| 66 | }; |
| 67 | |
| 68 | struct rt_sigframe |
| 69 | { |
| 70 | struct siginfo info; |
| 71 | struct ucontext uc; |
| 72 | u16 retcode[8]; |
| 73 | }; |
| 74 | |
| 75 | #ifdef CONFIG_SH_FPU |
| 76 | static inline int restore_sigcontext_fpu(struct sigcontext __user *sc) |
| 77 | { |
| 78 | struct task_struct *tsk = current; |
| 79 | |
| 80 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
| 81 | return 0; |
| 82 | |
| 83 | set_used_math(); |
| 84 | return __copy_from_user(&tsk->thread.xstate->hardfpu, &sc->sc_fpregs[0], |
| 85 | sizeof(long)*(16*2+2)); |
| 86 | } |
| 87 | |
| 88 | static inline int save_sigcontext_fpu(struct sigcontext __user *sc, |
| 89 | struct pt_regs *regs) |
| 90 | { |
| 91 | struct task_struct *tsk = current; |
| 92 | |
| 93 | if (!(boot_cpu_data.flags & CPU_HAS_FPU)) |
| 94 | return 0; |
| 95 | |
| 96 | if (!used_math()) |
| 97 | return __put_user(0, &sc->sc_ownedfp); |
| 98 | |
| 99 | if (__put_user(1, &sc->sc_ownedfp)) |
| 100 | return -EFAULT; |
| 101 | |
| 102 | /* This will cause a "finit" to be triggered by the next |
| 103 | attempted FPU operation by the 'current' process. |
| 104 | */ |
| 105 | clear_used_math(); |
| 106 | |
| 107 | unlazy_fpu(tsk, regs); |
| 108 | return __copy_to_user(&sc->sc_fpregs[0], &tsk->thread.xstate->hardfpu, |
| 109 | sizeof(long)*(16*2+2)); |
| 110 | } |
| 111 | #endif /* CONFIG_SH_FPU */ |
| 112 | |
| 113 | static int |
| 114 | restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *r0_p) |
| 115 | { |
| 116 | unsigned int err = 0; |
| 117 | |
| 118 | #define COPY(x) err |= __get_user(regs->x, &sc->sc_##x) |
| 119 | COPY(regs[1]); |
| 120 | COPY(regs[2]); COPY(regs[3]); |
| 121 | COPY(regs[4]); COPY(regs[5]); |
| 122 | COPY(regs[6]); COPY(regs[7]); |
| 123 | COPY(regs[8]); COPY(regs[9]); |
| 124 | COPY(regs[10]); COPY(regs[11]); |
| 125 | COPY(regs[12]); COPY(regs[13]); |
| 126 | COPY(regs[14]); COPY(regs[15]); |
| 127 | COPY(gbr); COPY(mach); |
| 128 | COPY(macl); COPY(pr); |
| 129 | COPY(sr); COPY(pc); |
| 130 | #undef COPY |
| 131 | |
| 132 | #ifdef CONFIG_SH_FPU |
| 133 | if (boot_cpu_data.flags & CPU_HAS_FPU) { |
| 134 | int owned_fp; |
| 135 | struct task_struct *tsk = current; |
| 136 | |
| 137 | regs->sr |= SR_FD; /* Release FPU */ |
| 138 | clear_fpu(tsk, regs); |
| 139 | clear_used_math(); |
| 140 | err |= __get_user (owned_fp, &sc->sc_ownedfp); |
| 141 | if (owned_fp) |
| 142 | err |= restore_sigcontext_fpu(sc); |
| 143 | } |
| 144 | #endif |
| 145 | |
| 146 | regs->tra = -1; /* disable syscall checks */ |
| 147 | err |= __get_user(*r0_p, &sc->sc_regs[0]); |
| 148 | return err; |
| 149 | } |
| 150 | |
| 151 | asmlinkage int sys_sigreturn(unsigned long r4, unsigned long r5, |
| 152 | unsigned long r6, unsigned long r7, |
| 153 | struct pt_regs __regs) |
| 154 | { |
| 155 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 156 | struct sigframe __user *frame = (struct sigframe __user *)regs->regs[15]; |
| 157 | sigset_t set; |
| 158 | int r0; |
| 159 | |
| 160 | /* Always make any pending restarted system calls return -EINTR */ |
| 161 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 162 | |
| 163 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 164 | goto badframe; |
| 165 | |
| 166 | if (__get_user(set.sig[0], &frame->sc.oldmask) |
| 167 | || (_NSIG_WORDS > 1 |
| 168 | && __copy_from_user(&set.sig[1], &frame->extramask, |
| 169 | sizeof(frame->extramask)))) |
| 170 | goto badframe; |
| 171 | |
| 172 | set_current_blocked(&set); |
| 173 | |
| 174 | if (restore_sigcontext(regs, &frame->sc, &r0)) |
| 175 | goto badframe; |
| 176 | return r0; |
| 177 | |
| 178 | badframe: |
| 179 | force_sig(SIGSEGV, current); |
| 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | asmlinkage int sys_rt_sigreturn(unsigned long r4, unsigned long r5, |
| 184 | unsigned long r6, unsigned long r7, |
| 185 | struct pt_regs __regs) |
| 186 | { |
| 187 | struct pt_regs *regs = RELOC_HIDE(&__regs, 0); |
| 188 | struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->regs[15]; |
| 189 | sigset_t set; |
| 190 | int r0; |
| 191 | |
| 192 | /* Always make any pending restarted system calls return -EINTR */ |
| 193 | current_thread_info()->restart_block.fn = do_no_restart_syscall; |
| 194 | |
| 195 | if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) |
| 196 | goto badframe; |
| 197 | |
| 198 | if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set))) |
| 199 | goto badframe; |
| 200 | |
| 201 | set_current_blocked(&set); |
| 202 | |
| 203 | if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) |
| 204 | goto badframe; |
| 205 | |
| 206 | if (restore_altstack(&frame->uc.uc_stack)) |
| 207 | goto badframe; |
| 208 | |
| 209 | return r0; |
| 210 | |
| 211 | badframe: |
| 212 | force_sig(SIGSEGV, current); |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Set up a signal frame. |
| 218 | */ |
| 219 | |
| 220 | static int |
| 221 | setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, |
| 222 | unsigned long mask) |
| 223 | { |
| 224 | int err = 0; |
| 225 | |
| 226 | #define COPY(x) err |= __put_user(regs->x, &sc->sc_##x) |
| 227 | COPY(regs[0]); COPY(regs[1]); |
| 228 | COPY(regs[2]); COPY(regs[3]); |
| 229 | COPY(regs[4]); COPY(regs[5]); |
| 230 | COPY(regs[6]); COPY(regs[7]); |
| 231 | COPY(regs[8]); COPY(regs[9]); |
| 232 | COPY(regs[10]); COPY(regs[11]); |
| 233 | COPY(regs[12]); COPY(regs[13]); |
| 234 | COPY(regs[14]); COPY(regs[15]); |
| 235 | COPY(gbr); COPY(mach); |
| 236 | COPY(macl); COPY(pr); |
| 237 | COPY(sr); COPY(pc); |
| 238 | #undef COPY |
| 239 | |
| 240 | #ifdef CONFIG_SH_FPU |
| 241 | err |= save_sigcontext_fpu(sc, regs); |
| 242 | #endif |
| 243 | |
| 244 | /* non-iBCS2 extensions.. */ |
| 245 | err |= __put_user(mask, &sc->oldmask); |
| 246 | |
| 247 | return err; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Determine which stack to use.. |
| 252 | */ |
| 253 | static inline void __user * |
| 254 | get_sigframe(struct k_sigaction *ka, unsigned long sp, size_t frame_size) |
| 255 | { |
| 256 | if (ka->sa.sa_flags & SA_ONSTACK) { |
| 257 | if (sas_ss_flags(sp) == 0) |
| 258 | sp = current->sas_ss_sp + current->sas_ss_size; |
| 259 | } |
| 260 | |
| 261 | return (void __user *)((sp - (frame_size+UNWINDGUARD)) & -8ul); |
| 262 | } |
| 263 | |
| 264 | /* These symbols are defined with the addresses in the vsyscall page. |
| 265 | See vsyscall-trapa.S. */ |
| 266 | extern void __kernel_sigreturn(void); |
| 267 | extern void __kernel_rt_sigreturn(void); |
| 268 | |
| 269 | static int setup_frame(int sig, struct k_sigaction *ka, |
| 270 | sigset_t *set, struct pt_regs *regs) |
| 271 | { |
| 272 | struct sigframe __user *frame; |
| 273 | int err = 0; |
| 274 | int signal; |
| 275 | |
| 276 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 277 | |
| 278 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 279 | goto give_sigsegv; |
| 280 | |
| 281 | signal = current_thread_info()->exec_domain |
| 282 | && current_thread_info()->exec_domain->signal_invmap |
| 283 | && sig < 32 |
| 284 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 285 | : sig; |
| 286 | |
| 287 | err |= setup_sigcontext(&frame->sc, regs, set->sig[0]); |
| 288 | |
| 289 | if (_NSIG_WORDS > 1) |
| 290 | err |= __copy_to_user(frame->extramask, &set->sig[1], |
| 291 | sizeof(frame->extramask)); |
| 292 | |
| 293 | /* Set up to return from userspace. If provided, use a stub |
| 294 | already in userspace. */ |
| 295 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 296 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
| 297 | #ifdef CONFIG_VSYSCALL |
| 298 | } else if (likely(current->mm->context.vdso)) { |
| 299 | regs->pr = VDSO_SYM(&__kernel_sigreturn); |
| 300 | #endif |
| 301 | } else { |
| 302 | /* Generate return code (system call to sigreturn) */ |
| 303 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
| 304 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
| 305 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 306 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 307 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 308 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 309 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 310 | err |= __put_user((__NR_sigreturn), &frame->retcode[7]); |
| 311 | regs->pr = (unsigned long) frame->retcode; |
| 312 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
| 313 | } |
| 314 | |
| 315 | if (err) |
| 316 | goto give_sigsegv; |
| 317 | |
| 318 | /* Set up registers for signal handler */ |
| 319 | regs->regs[15] = (unsigned long) frame; |
| 320 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 321 | regs->regs[5] = 0; |
| 322 | regs->regs[6] = (unsigned long) &frame->sc; |
| 323 | |
| 324 | if (current->personality & FDPIC_FUNCPTRS) { |
| 325 | struct fdpic_func_descriptor __user *funcptr = |
| 326 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 327 | |
| 328 | err |= __get_user(regs->pc, &funcptr->text); |
| 329 | err |= __get_user(regs->regs[12], &funcptr->GOT); |
| 330 | } else |
| 331 | regs->pc = (unsigned long)ka->sa.sa_handler; |
| 332 | |
| 333 | if (err) |
| 334 | goto give_sigsegv; |
| 335 | |
| 336 | set_fs(USER_DS); |
| 337 | |
| 338 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
| 339 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
| 340 | |
| 341 | return 0; |
| 342 | |
| 343 | give_sigsegv: |
| 344 | force_sigsegv(sig, current); |
| 345 | return -EFAULT; |
| 346 | } |
| 347 | |
| 348 | static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |
| 349 | sigset_t *set, struct pt_regs *regs) |
| 350 | { |
| 351 | struct rt_sigframe __user *frame; |
| 352 | int err = 0; |
| 353 | int signal; |
| 354 | |
| 355 | frame = get_sigframe(ka, regs->regs[15], sizeof(*frame)); |
| 356 | |
| 357 | if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) |
| 358 | goto give_sigsegv; |
| 359 | |
| 360 | signal = current_thread_info()->exec_domain |
| 361 | && current_thread_info()->exec_domain->signal_invmap |
| 362 | && sig < 32 |
| 363 | ? current_thread_info()->exec_domain->signal_invmap[sig] |
| 364 | : sig; |
| 365 | |
| 366 | err |= copy_siginfo_to_user(&frame->info, info); |
| 367 | |
| 368 | /* Create the ucontext. */ |
| 369 | err |= __put_user(0, &frame->uc.uc_flags); |
| 370 | err |= __put_user(NULL, &frame->uc.uc_link); |
| 371 | err |= __save_altstack(&frame->uc.uc_stack, regs->regs[15]); |
| 372 | err |= setup_sigcontext(&frame->uc.uc_mcontext, |
| 373 | regs, set->sig[0]); |
| 374 | err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); |
| 375 | |
| 376 | /* Set up to return from userspace. If provided, use a stub |
| 377 | already in userspace. */ |
| 378 | if (ka->sa.sa_flags & SA_RESTORER) { |
| 379 | regs->pr = (unsigned long) ka->sa.sa_restorer; |
| 380 | #ifdef CONFIG_VSYSCALL |
| 381 | } else if (likely(current->mm->context.vdso)) { |
| 382 | regs->pr = VDSO_SYM(&__kernel_rt_sigreturn); |
| 383 | #endif |
| 384 | } else { |
| 385 | /* Generate return code (system call to rt_sigreturn) */ |
| 386 | err |= __put_user(MOVW(7), &frame->retcode[0]); |
| 387 | err |= __put_user(TRAP_NOARG, &frame->retcode[1]); |
| 388 | err |= __put_user(OR_R0_R0, &frame->retcode[2]); |
| 389 | err |= __put_user(OR_R0_R0, &frame->retcode[3]); |
| 390 | err |= __put_user(OR_R0_R0, &frame->retcode[4]); |
| 391 | err |= __put_user(OR_R0_R0, &frame->retcode[5]); |
| 392 | err |= __put_user(OR_R0_R0, &frame->retcode[6]); |
| 393 | err |= __put_user((__NR_rt_sigreturn), &frame->retcode[7]); |
| 394 | regs->pr = (unsigned long) frame->retcode; |
| 395 | flush_icache_range(regs->pr, regs->pr + sizeof(frame->retcode)); |
| 396 | } |
| 397 | |
| 398 | if (err) |
| 399 | goto give_sigsegv; |
| 400 | |
| 401 | /* Set up registers for signal handler */ |
| 402 | regs->regs[15] = (unsigned long) frame; |
| 403 | regs->regs[4] = signal; /* Arg for signal handler */ |
| 404 | regs->regs[5] = (unsigned long) &frame->info; |
| 405 | regs->regs[6] = (unsigned long) &frame->uc; |
| 406 | |
| 407 | if (current->personality & FDPIC_FUNCPTRS) { |
| 408 | struct fdpic_func_descriptor __user *funcptr = |
| 409 | (struct fdpic_func_descriptor __user *)ka->sa.sa_handler; |
| 410 | |
| 411 | err |= __get_user(regs->pc, &funcptr->text); |
| 412 | err |= __get_user(regs->regs[12], &funcptr->GOT); |
| 413 | } else |
| 414 | regs->pc = (unsigned long)ka->sa.sa_handler; |
| 415 | |
| 416 | if (err) |
| 417 | goto give_sigsegv; |
| 418 | |
| 419 | set_fs(USER_DS); |
| 420 | |
| 421 | pr_debug("SIG deliver (%s:%d): sp=%p pc=%08lx pr=%08lx\n", |
| 422 | current->comm, task_pid_nr(current), frame, regs->pc, regs->pr); |
| 423 | |
| 424 | return 0; |
| 425 | |
| 426 | give_sigsegv: |
| 427 | force_sigsegv(sig, current); |
| 428 | return -EFAULT; |
| 429 | } |
| 430 | |
| 431 | static inline void |
| 432 | handle_syscall_restart(unsigned long save_r0, struct pt_regs *regs, |
| 433 | struct sigaction *sa) |
| 434 | { |
| 435 | /* If we're not from a syscall, bail out */ |
| 436 | if (regs->tra < 0) |
| 437 | return; |
| 438 | |
| 439 | /* check for system call restart.. */ |
| 440 | switch (regs->regs[0]) { |
| 441 | case -ERESTART_RESTARTBLOCK: |
| 442 | case -ERESTARTNOHAND: |
| 443 | no_system_call_restart: |
| 444 | regs->regs[0] = -EINTR; |
| 445 | break; |
| 446 | |
| 447 | case -ERESTARTSYS: |
| 448 | if (!(sa->sa_flags & SA_RESTART)) |
| 449 | goto no_system_call_restart; |
| 450 | /* fallthrough */ |
| 451 | case -ERESTARTNOINTR: |
| 452 | regs->regs[0] = save_r0; |
| 453 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
| 454 | break; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * OK, we're invoking a handler |
| 460 | */ |
| 461 | static void |
| 462 | handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info, |
| 463 | struct pt_regs *regs, unsigned int save_r0) |
| 464 | { |
| 465 | sigset_t *oldset = sigmask_to_save(); |
| 466 | int ret; |
| 467 | |
| 468 | /* Set up the stack frame */ |
| 469 | if (ka->sa.sa_flags & SA_SIGINFO) |
| 470 | ret = setup_rt_frame(sig, ka, info, oldset, regs); |
| 471 | else |
| 472 | ret = setup_frame(sig, ka, oldset, regs); |
| 473 | |
| 474 | if (ret) |
| 475 | return; |
| 476 | signal_delivered(sig, info, ka, regs, |
| 477 | test_thread_flag(TIF_SINGLESTEP)); |
| 478 | } |
| 479 | |
| 480 | /* |
| 481 | * Note that 'init' is a special process: it doesn't get signals it doesn't |
| 482 | * want to handle. Thus you cannot kill init even with a SIGKILL even by |
| 483 | * mistake. |
| 484 | * |
| 485 | * Note that we go through the signals twice: once to check the signals that |
| 486 | * the kernel can handle, and then we build all the user-level signal handling |
| 487 | * stack-frames in one go after that. |
| 488 | */ |
| 489 | static void do_signal(struct pt_regs *regs, unsigned int save_r0) |
| 490 | { |
| 491 | siginfo_t info; |
| 492 | int signr; |
| 493 | struct k_sigaction ka; |
| 494 | |
| 495 | /* |
| 496 | * We want the common case to go fast, which |
| 497 | * is why we may in certain cases get here from |
| 498 | * kernel mode. Just return without doing anything |
| 499 | * if so. |
| 500 | */ |
| 501 | if (!user_mode(regs)) |
| 502 | return; |
| 503 | |
| 504 | signr = get_signal_to_deliver(&info, &ka, regs, NULL); |
| 505 | if (signr > 0) { |
| 506 | handle_syscall_restart(save_r0, regs, &ka.sa); |
| 507 | |
| 508 | /* Whee! Actually deliver the signal. */ |
| 509 | handle_signal(signr, &ka, &info, regs, save_r0); |
| 510 | return; |
| 511 | } |
| 512 | |
| 513 | /* Did we come from a system call? */ |
| 514 | if (regs->tra >= 0) { |
| 515 | /* Restart the system call - no handlers present */ |
| 516 | if (regs->regs[0] == -ERESTARTNOHAND || |
| 517 | regs->regs[0] == -ERESTARTSYS || |
| 518 | regs->regs[0] == -ERESTARTNOINTR) { |
| 519 | regs->regs[0] = save_r0; |
| 520 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
| 521 | } else if (regs->regs[0] == -ERESTART_RESTARTBLOCK) { |
| 522 | regs->pc -= instruction_size(__raw_readw(regs->pc - 4)); |
| 523 | regs->regs[3] = __NR_restart_syscall; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * If there's no signal to deliver, we just put the saved sigmask |
| 529 | * back. |
| 530 | */ |
| 531 | restore_saved_sigmask(); |
| 532 | } |
| 533 | |
| 534 | asmlinkage void do_notify_resume(struct pt_regs *regs, unsigned int save_r0, |
| 535 | unsigned long thread_info_flags) |
| 536 | { |
| 537 | /* deal with pending signal delivery */ |
| 538 | if (thread_info_flags & _TIF_SIGPENDING) |
| 539 | do_signal(regs, save_r0); |
| 540 | |
| 541 | if (thread_info_flags & _TIF_NOTIFY_RESUME) { |
| 542 | clear_thread_flag(TIF_NOTIFY_RESUME); |
| 543 | tracehook_notify_resume(regs); |
| 544 | } |
| 545 | } |