projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 22e38f29 BH |
1 | /* |
| 2 | * Common signal handling code for both 32 and 64 bits | |
| 3 | * | |
| 4 | * Copyright (c) 2007 Benjamin Herrenschmidt, IBM Coproration | |
| 5 | * Extracted from signal_32.c and signal_64.c | |
| 6 | * | |
| 7 | * This file is subject to the terms and conditions of the GNU General | |
| 8 | * Public License. See the file README.legal in the main directory of | |
| 9 | * this archive for more details. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/ptrace.h> | |
| 13 | #include <linux/signal.h> | |
| 14 | #include <asm/unistd.h> | |
| 15 | ||
| db277e9a CH |
16 | #include "signal.h" |
| 17 | ||
| 18 | ||
| 19 | /* | |
| 20 | * Restore the user process's signal mask | |
| 21 | */ | |
| 22 | void restore_sigmask(sigset_t *set) | |
| 23 | { | |
| 24 | sigdelsetmask(set, ~_BLOCKABLE); | |
| 25 | spin_lock_irq(¤t->sighand->siglock); | |
| 26 | current->blocked = *set; | |
| 27 | recalc_sigpending(); | |
| 28 | spin_unlock_irq(¤t->sighand->siglock); | |
| 29 | } | |
| 30 | ||
| 22e38f29 BH |
31 | void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka, |
| 32 | int has_handler) | |
| 33 | { | |
| 34 | unsigned long ret = regs->gpr[3]; | |
| 35 | int restart = 1; | |
| 36 | ||
| 37 | /* syscall ? */ | |
| 38 | if (TRAP(regs) != 0x0C00) | |
| 39 | return; | |
| 40 | ||
| 41 | /* error signalled ? */ | |
| 42 | if (!(regs->ccr & 0x10000000)) | |
| 43 | return; | |
| 44 | ||
| 45 | switch (ret) { | |
| 46 | case ERESTART_RESTARTBLOCK: | |
| 47 | case ERESTARTNOHAND: | |
| 48 | /* ERESTARTNOHAND means that the syscall should only be | |
| 49 | * restarted if there was no handler for the signal, and since | |
| 50 | * we only get here if there is a handler, we dont restart. | |
| 51 | */ | |
| 52 | restart = !has_handler; | |
| 53 | break; | |
| 54 | case ERESTARTSYS: | |
| 55 | /* ERESTARTSYS means to restart the syscall if there is no | |
| 56 | * handler or the handler was registered with SA_RESTART | |
| 57 | */ | |
| 58 | restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0; | |
| 59 | break; | |
| 60 | case ERESTARTNOINTR: | |
| 61 | /* ERESTARTNOINTR means that the syscall should be | |
| 62 | * called again after the signal handler returns. | |
| 63 | */ | |
| 64 | break; | |
| 65 | default: | |
| 66 | return; | |
| 67 | } | |
| 68 | if (restart) { | |
| 69 | if (ret == ERESTART_RESTARTBLOCK) | |
| 70 | regs->gpr[0] = __NR_restart_syscall; | |
| 71 | else | |
| 72 | regs->gpr[3] = regs->orig_gpr3; | |
| 73 | regs->nip -= 4; | |
| 74 | regs->result = 0; | |
| 75 | } else { | |
| 76 | regs->result = -EINTR; | |
| 77 | regs->gpr[3] = EINTR; | |
| 78 | regs->ccr |= 0x10000000; | |
| 79 | } | |
| 80 | } | |
| 69d15f6b CH |
81 | |
| 82 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, | |
| 83 | unsigned long r5, unsigned long r6, unsigned long r7, | |
| 84 | unsigned long r8, struct pt_regs *regs) | |
| 85 | { | |
| 86 | return do_sigaltstack(uss, uoss, regs->gpr[1]); | |
| 87 | } |