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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 | } | |
69d15f6b CH |
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 | } |