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 | ||
| 16 | void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka, | |
| 17 | int has_handler) | |
| 18 | { | |
| 19 | unsigned long ret = regs->gpr[3]; | |
| 20 | int restart = 1; | |
| 21 | ||
| 22 | /* syscall ? */ | |
| 23 | if (TRAP(regs) != 0x0C00) | |
| 24 | return; | |
| 25 | ||
| 26 | /* error signalled ? */ | |
| 27 | if (!(regs->ccr & 0x10000000)) | |
| 28 | return; | |
| 29 | ||
| 30 | switch (ret) { | |
| 31 | case ERESTART_RESTARTBLOCK: | |
| 32 | case ERESTARTNOHAND: | |
| 33 | /* ERESTARTNOHAND means that the syscall should only be | |
| 34 | * restarted if there was no handler for the signal, and since | |
| 35 | * we only get here if there is a handler, we dont restart. | |
| 36 | */ | |
| 37 | restart = !has_handler; | |
| 38 | break; | |
| 39 | case ERESTARTSYS: | |
| 40 | /* ERESTARTSYS means to restart the syscall if there is no | |
| 41 | * handler or the handler was registered with SA_RESTART | |
| 42 | */ | |
| 43 | restart = !has_handler || (ka->sa.sa_flags & SA_RESTART) != 0; | |
| 44 | break; | |
| 45 | case ERESTARTNOINTR: | |
| 46 | /* ERESTARTNOINTR means that the syscall should be | |
| 47 | * called again after the signal handler returns. | |
| 48 | */ | |
| 49 | break; | |
| 50 | default: | |
| 51 | return; | |
| 52 | } | |
| 53 | if (restart) { | |
| 54 | if (ret == ERESTART_RESTARTBLOCK) | |
| 55 | regs->gpr[0] = __NR_restart_syscall; | |
| 56 | else | |
| 57 | regs->gpr[3] = regs->orig_gpr3; | |
| 58 | regs->nip -= 4; | |
| 59 | regs->result = 0; | |
| 60 | } else { | |
| 61 | regs->result = -EINTR; | |
| 62 | regs->gpr[3] = EINTR; | |
| 63 | regs->ccr |= 0x10000000; | |
| 64 | } | |
| 65 | } |