| Benjamin Herrenschmidt | 22e38f2 | 2007-06-04 15:15:49 +1000 | [diff] [blame] | 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 | } |
| Christoph Hellwig | 69d15f6 | 2007-06-04 15:15:50 +1000 | [diff] [blame^] | 66 | |
| 67 | long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, |
| 68 | unsigned long r5, unsigned long r6, unsigned long r7, |
| 69 | unsigned long r8, struct pt_regs *regs) |
| 70 | { |
| 71 | return do_sigaltstack(uss, uoss, regs->gpr[1]); |
| 72 | } |