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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 PathScale, Inc | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <signal.h> | |
0805d89c GS |
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" | |
0805d89c GS |
15 | #include "user.h" |
16 | #include "signal_kern.h" | |
17 | #include "sysdep/sigcontext.h" | |
18 | #include "sysdep/signal.h" | |
19 | #include "sigcontext.h" | |
1da177e4 | 20 | #include "mode.h" |
cff65c4f | 21 | #include "os.h" |
1da177e4 | 22 | |
51a6b0c5 | 23 | void sig_handler(ARCH_SIGHDLR_PARAM) |
1da177e4 LT |
24 | { |
25 | struct sigcontext *sc; | |
26 | ||
27 | ARCH_GET_SIGCONTEXT(sc, sig); | |
28 | CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas, | |
29 | sig, sc); | |
30 | } | |
31 | ||
32 | extern int timer_irq_inited; | |
33 | ||
51a6b0c5 | 34 | void alarm_handler(ARCH_SIGHDLR_PARAM) |
1da177e4 LT |
35 | { |
36 | struct sigcontext *sc; | |
37 | ||
38 | ARCH_GET_SIGCONTEXT(sc, sig); | |
39 | if(!timer_irq_inited) return; | |
40 | ||
41 | if(sig == SIGALRM) | |
42 | switch_timers(0); | |
43 | ||
44 | CHOOSE_MODE_PROC(sig_handler_common_tt, sig_handler_common_skas, | |
45 | sig, sc); | |
46 | ||
47 | if(sig == SIGALRM) | |
48 | switch_timers(1); | |
49 | } | |
50 | ||
2c332a25 BS |
51 | extern void do_boot_timer_handler(struct sigcontext * sc); |
52 | ||
53 | void boot_timer_handler(ARCH_SIGHDLR_PARAM) | |
54 | { | |
55 | struct sigcontext *sc; | |
56 | ||
57 | ARCH_GET_SIGCONTEXT(sc, sig); | |
58 | ||
59 | do_boot_timer_handler(sc); | |
60 | } | |
61 | ||
0805d89c GS |
62 | void set_sigstack(void *sig_stack, int size) |
63 | { | |
64 | stack_t stack = ((stack_t) { .ss_flags = 0, | |
65 | .ss_sp = (__ptr_t) sig_stack, | |
66 | .ss_size = size - sizeof(void *) }); | |
67 | ||
68 | if(sigaltstack(&stack, NULL) != 0) | |
69 | panic("enabling signal stack failed, errno = %d\n", errno); | |
70 | } | |
71 | ||
72 | void remove_sigstack(void) | |
73 | { | |
74 | stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE, | |
75 | .ss_sp = NULL, | |
76 | .ss_size = 0 }); | |
77 | ||
78 | if(sigaltstack(&stack, NULL) != 0) | |
79 | panic("disabling signal stack failed, errno = %d\n", errno); | |
80 | } | |
81 | ||
82 | void set_handler(int sig, void (*handler)(int), int flags, ...) | |
83 | { | |
84 | struct sigaction action; | |
85 | va_list ap; | |
86 | int mask; | |
87 | ||
88 | va_start(ap, flags); | |
89 | action.sa_handler = handler; | |
90 | sigemptyset(&action.sa_mask); | |
91 | while((mask = va_arg(ap, int)) != -1){ | |
92 | sigaddset(&action.sa_mask, mask); | |
93 | } | |
94 | va_end(ap); | |
95 | action.sa_flags = flags; | |
96 | action.sa_restorer = NULL; | |
97 | if(sigaction(sig, &action, NULL) < 0) | |
98 | panic("sigaction failed"); | |
99 | } | |
100 | ||
101 | int change_sig(int signal, int on) | |
102 | { | |
103 | sigset_t sigset, old; | |
104 | ||
105 | sigemptyset(&sigset); | |
106 | sigaddset(&sigset, signal); | |
107 | sigprocmask(on ? SIG_UNBLOCK : SIG_BLOCK, &sigset, &old); | |
108 | return(!sigismember(&old, signal)); | |
109 | } | |
110 | ||
111 | /* Both here and in set/get_signal we don't touch SIGPROF, because we must not | |
112 | * disable profiling; it's safe because the profiling code does not interact | |
113 | * with the kernel code at all.*/ | |
114 | ||
115 | static void change_signals(int type) | |
116 | { | |
117 | sigset_t mask; | |
118 | ||
119 | sigemptyset(&mask); | |
120 | sigaddset(&mask, SIGVTALRM); | |
121 | sigaddset(&mask, SIGALRM); | |
122 | sigaddset(&mask, SIGIO); | |
123 | if(sigprocmask(type, &mask, NULL) < 0) | |
124 | panic("Failed to change signal mask - errno = %d", errno); | |
125 | } | |
126 | ||
127 | void block_signals(void) | |
128 | { | |
129 | change_signals(SIG_BLOCK); | |
130 | } | |
131 | ||
132 | void unblock_signals(void) | |
133 | { | |
134 | change_signals(SIG_UNBLOCK); | |
135 | } | |
136 | ||
137 | /* These are the asynchronous signals. SIGVTALRM and SIGARLM are handled | |
138 | * together under SIGVTALRM_BIT. SIGPROF is excluded because we want to | |
139 | * be able to profile all of UML, not just the non-critical sections. If | |
140 | * profiling is not thread-safe, then that is not my problem. We can disable | |
141 | * profiling when SMP is enabled in that case. | |
1da177e4 | 142 | */ |
0805d89c GS |
143 | #define SIGIO_BIT 0 |
144 | #define SIGVTALRM_BIT 1 | |
145 | ||
146 | static int enable_mask(sigset_t *mask) | |
147 | { | |
148 | int sigs; | |
149 | ||
150 | sigs = sigismember(mask, SIGIO) ? 0 : 1 << SIGIO_BIT; | |
151 | sigs |= sigismember(mask, SIGVTALRM) ? 0 : 1 << SIGVTALRM_BIT; | |
152 | sigs |= sigismember(mask, SIGALRM) ? 0 : 1 << SIGVTALRM_BIT; | |
153 | return(sigs); | |
154 | } | |
155 | ||
156 | int get_signals(void) | |
157 | { | |
158 | sigset_t mask; | |
159 | ||
160 | if(sigprocmask(SIG_SETMASK, NULL, &mask) < 0) | |
161 | panic("Failed to get signal mask"); | |
162 | return(enable_mask(&mask)); | |
163 | } | |
164 | ||
165 | int set_signals(int enable) | |
166 | { | |
167 | sigset_t mask; | |
168 | int ret; | |
169 | ||
170 | sigemptyset(&mask); | |
171 | if(enable & (1 << SIGIO_BIT)) | |
172 | sigaddset(&mask, SIGIO); | |
173 | if(enable & (1 << SIGVTALRM_BIT)){ | |
174 | sigaddset(&mask, SIGVTALRM); | |
175 | sigaddset(&mask, SIGALRM); | |
176 | } | |
177 | ||
178 | /* This is safe - sigprocmask is guaranteed to copy locally the | |
179 | * value of new_set, do his work and then, at the end, write to | |
180 | * old_set. | |
181 | */ | |
182 | if(sigprocmask(SIG_UNBLOCK, &mask, &mask) < 0) | |
183 | panic("Failed to enable signals"); | |
184 | ret = enable_mask(&mask); | |
185 | sigemptyset(&mask); | |
186 | if((enable & (1 << SIGIO_BIT)) == 0) | |
187 | sigaddset(&mask, SIGIO); | |
188 | if((enable & (1 << SIGVTALRM_BIT)) == 0){ | |
189 | sigaddset(&mask, SIGVTALRM); | |
190 | sigaddset(&mask, SIGALRM); | |
191 | } | |
192 | if(sigprocmask(SIG_BLOCK, &mask, NULL) < 0) | |
193 | panic("Failed to block signals"); | |
194 | ||
195 | return(ret); | |
196 | } | |
abaf6977 GS |
197 | |
198 | void os_usr1_signal(int on) | |
199 | { | |
200 | change_sig(SIGUSR1, on); | |
201 | } |