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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 | ||
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 | } |