Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 PathScale, Inc |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
| 6 | #include <signal.h> |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 7 | #include <stdio.h> |
| 8 | #include <unistd.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <errno.h> |
| 11 | #include <stdarg.h> |
| 12 | #include <string.h> |
| 13 | #include <sys/mman.h> |
| 14 | #include "user_util.h" |
| 15 | #include "kern_util.h" |
| 16 | #include "user.h" |
| 17 | #include "signal_kern.h" |
| 18 | #include "sysdep/sigcontext.h" |
| 19 | #include "sysdep/signal.h" |
| 20 | #include "sigcontext.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "mode.h" |
Gennady Sharapov | cff65c4 | 2006-01-18 17:42:42 -0800 | [diff] [blame^] | 22 | #include "os.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
Bodo Stroesser | 51a6b0c | 2005-05-05 16:15:38 -0700 | [diff] [blame] | 24 | void sig_handler(ARCH_SIGHDLR_PARAM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
| 26 | struct sigcontext *sc; |
| 27 | |
| 28 | ARCH_GET_SIGCONTEXT(sc, sig); |
| 29 | CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas, |
| 30 | sig, sc); |
| 31 | } |
| 32 | |
| 33 | extern int timer_irq_inited; |
| 34 | |
Bodo Stroesser | 51a6b0c | 2005-05-05 16:15:38 -0700 | [diff] [blame] | 35 | void alarm_handler(ARCH_SIGHDLR_PARAM) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
| 37 | struct sigcontext *sc; |
| 38 | |
| 39 | ARCH_GET_SIGCONTEXT(sc, sig); |
| 40 | if(!timer_irq_inited) return; |
| 41 | |
| 42 | if(sig == SIGALRM) |
| 43 | switch_timers(0); |
| 44 | |
| 45 | CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas, |
| 46 | sig, sc); |
| 47 | |
| 48 | if(sig == SIGALRM) |
| 49 | switch_timers(1); |
| 50 | } |
| 51 | |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 52 | void set_sigstack(void *sig_stack, int size) |
| 53 | { |
| 54 | stack_t stack = ((stack_t) { .ss_flags = 0, |
| 55 | .ss_sp = (__ptr_t) sig_stack, |
| 56 | .ss_size = size - sizeof(void *) }); |
| 57 | |
| 58 | if(sigaltstack(&stack, NULL) != 0) |
| 59 | panic("enabling signal stack failed, errno = %d\n", errno); |
| 60 | } |
| 61 | |
| 62 | void remove_sigstack(void) |
| 63 | { |
| 64 | stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE, |
| 65 | .ss_sp = NULL, |
| 66 | .ss_size = 0 }); |
| 67 | |
| 68 | if(sigaltstack(&stack, NULL) != 0) |
| 69 | panic("disabling signal stack failed, errno = %d\n", errno); |
| 70 | } |
| 71 | |
| 72 | void set_handler(int sig, void (*handler)(int), int flags, ...) |
| 73 | { |
| 74 | struct sigaction action; |
| 75 | va_list ap; |
| 76 | int mask; |
| 77 | |
| 78 | va_start(ap, flags); |
| 79 | action.sa_handler = handler; |
| 80 | sigemptyset(&action.sa_mask); |
| 81 | while((mask = va_arg(ap, int)) != -1){ |
| 82 | sigaddset(&action.sa_mask, mask); |
| 83 | } |
| 84 | va_end(ap); |
| 85 | action.sa_flags = flags; |
| 86 | action.sa_restorer = NULL; |
| 87 | if(sigaction(sig, &action, NULL) < 0) |
| 88 | panic("sigaction failed"); |
| 89 | } |
| 90 | |
| 91 | int change_sig(int signal, int on) |
| 92 | { |
| 93 | sigset_t sigset, old; |
| 94 | |
| 95 | sigemptyset(&sigset); |
| 96 | sigaddset(&sigset, signal); |
| 97 | sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old); |
| 98 | return(!sigismember(&old, signal)); |
| 99 | } |
| 100 | |
| 101 | /* Both here and in set/get_signal we don't touch SIGPROF, because we must not |
| 102 | * disable profiling; it's safe because the profiling code does not interact |
| 103 | * with the kernel code at all.*/ |
| 104 | |
| 105 | static void change_signals(int type) |
| 106 | { |
| 107 | sigset_t mask; |
| 108 | |
| 109 | sigemptyset(&mask); |
| 110 | sigaddset(&mask, SIGVTALRM); |
| 111 | sigaddset(&mask, SIGALRM); |
| 112 | sigaddset(&mask, SIGIO); |
| 113 | if(sigprocmask(type, &mask, NULL) < 0) |
| 114 | panic("Failed to change signal mask - errno = %d", errno); |
| 115 | } |
| 116 | |
| 117 | void block_signals(void) |
| 118 | { |
| 119 | change_signals(SIG_BLOCK); |
| 120 | } |
| 121 | |
| 122 | void unblock_signals(void) |
| 123 | { |
| 124 | change_signals(SIG_UNBLOCK); |
| 125 | } |
| 126 | |
| 127 | /* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled |
| 128 | * together under SIGVTALRM_BIT. SIGPROF is excluded because we want to |
| 129 | * be able to profile all of UML, not just the non-critical sections. If |
| 130 | * profiling is not thread-safe, then that is not my problem. We can disable |
| 131 | * profiling when SMP is enabled in that case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | */ |
Gennady Sharapov | 0805d89 | 2006-01-08 01:01:29 -0800 | [diff] [blame] | 133 | #define SIGIO_BIT 0 |
| 134 | #define SIGVTALRM_BIT 1 |
| 135 | |
| 136 | static int enable_mask(sigset_t *mask) |
| 137 | { |
| 138 | int sigs; |
| 139 | |
| 140 | sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT; |
| 141 | sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT; |
| 142 | sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT; |
| 143 | return(sigs); |
| 144 | } |
| 145 | |
| 146 | int get_signals(void) |
| 147 | { |
| 148 | sigset_t mask; |
| 149 | |
| 150 | if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0) |
| 151 | panic("Failed to get signal mask"); |
| 152 | return(enable_mask(&mask)); |
| 153 | } |
| 154 | |
| 155 | int set_signals(int enable) |
| 156 | { |
| 157 | sigset_t mask; |
| 158 | int ret; |
| 159 | |
| 160 | sigemptyset(&mask); |
| 161 | if(enable & (1 << SIGIO_BIT)) |
| 162 | sigaddset(&mask, SIGIO); |
| 163 | if(enable & (1 << SIGVTALRM_BIT)){ |
| 164 | sigaddset(&mask, SIGVTALRM); |
| 165 | sigaddset(&mask, SIGALRM); |
| 166 | } |
| 167 | |
| 168 | /* This is safe - sigprocmask is guaranteed to copy locally the |
| 169 | * value of new_set, do his work and then, at the end, write to |
| 170 | * old_set. |
| 171 | */ |
| 172 | if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0) |
| 173 | panic("Failed to enable signals"); |
| 174 | ret = enable_mask(&mask); |
| 175 | sigemptyset(&mask); |
| 176 | if((enable & (1 << SIGIO_BIT)) == 0) |
| 177 | sigaddset(&mask, SIGIO); |
| 178 | if((enable & (1 << SIGVTALRM_BIT)) == 0){ |
| 179 | sigaddset(&mask, SIGVTALRM); |
| 180 | sigaddset(&mask, SIGALRM); |
| 181 | } |
| 182 | if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0) |
| 183 | panic("Failed to block signals"); |
| 184 | |
| 185 | return(ret); |
| 186 | } |