This source file includes following definitions.
- block_signals_trace
- unblock_signals_trace
- um_trace_signals_on
- um_trace_signals_off
- handle_signal
- do_signal
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6 #include <linux/module.h>
7 #include <linux/ptrace.h>
8 #include <linux/sched.h>
9 #include <linux/ftrace.h>
10 #include <asm/siginfo.h>
11 #include <asm/signal.h>
12 #include <asm/unistd.h>
13 #include <frame_kern.h>
14 #include <kern_util.h>
15 #include <os.h>
16
17 EXPORT_SYMBOL(block_signals);
18 EXPORT_SYMBOL(unblock_signals);
19
20 void block_signals_trace(void)
21 {
22 block_signals();
23 if (current_thread_info())
24 trace_hardirqs_off();
25 }
26
27 void unblock_signals_trace(void)
28 {
29 if (current_thread_info())
30 trace_hardirqs_on();
31 unblock_signals();
32 }
33
34 void um_trace_signals_on(void)
35 {
36 if (current_thread_info())
37 trace_hardirqs_on();
38 }
39
40 void um_trace_signals_off(void)
41 {
42 if (current_thread_info())
43 trace_hardirqs_off();
44 }
45
46
47
48
49 static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
50 {
51 sigset_t *oldset = sigmask_to_save();
52 int singlestep = 0;
53 unsigned long sp;
54 int err;
55
56 if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
57 singlestep = 1;
58
59
60 if (PT_REGS_SYSCALL_NR(regs) >= 0) {
61
62 switch (PT_REGS_SYSCALL_RET(regs)) {
63 case -ERESTART_RESTARTBLOCK:
64 case -ERESTARTNOHAND:
65 PT_REGS_SYSCALL_RET(regs) = -EINTR;
66 break;
67
68 case -ERESTARTSYS:
69 if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
70 PT_REGS_SYSCALL_RET(regs) = -EINTR;
71 break;
72 }
73
74 case -ERESTARTNOINTR:
75 PT_REGS_RESTART_SYSCALL(regs);
76 PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
77 break;
78 }
79 }
80
81 sp = PT_REGS_SP(regs);
82 if ((ksig->ka.sa.sa_flags & SA_ONSTACK) && (sas_ss_flags(sp) == 0))
83 sp = current->sas_ss_sp + current->sas_ss_size;
84
85 #ifdef CONFIG_ARCH_HAS_SC_SIGNALS
86 if (!(ksig->ka.sa.sa_flags & SA_SIGINFO))
87 err = setup_signal_stack_sc(sp, ksig, regs, oldset);
88 else
89 #endif
90 err = setup_signal_stack_si(sp, ksig, regs, oldset);
91
92 signal_setup_done(err, ksig, singlestep);
93 }
94
95 void do_signal(struct pt_regs *regs)
96 {
97 struct ksignal ksig;
98 int handled_sig = 0;
99
100 while (get_signal(&ksig)) {
101 handled_sig = 1;
102
103 handle_signal(&ksig, regs);
104 }
105
106
107 if (!handled_sig && (PT_REGS_SYSCALL_NR(regs) >= 0)) {
108
109 switch (PT_REGS_SYSCALL_RET(regs)) {
110 case -ERESTARTNOHAND:
111 case -ERESTARTSYS:
112 case -ERESTARTNOINTR:
113 PT_REGS_ORIG_SYSCALL(regs) = PT_REGS_SYSCALL_NR(regs);
114 PT_REGS_RESTART_SYSCALL(regs);
115 break;
116 case -ERESTART_RESTARTBLOCK:
117 PT_REGS_ORIG_SYSCALL(regs) = __NR_restart_syscall;
118 PT_REGS_RESTART_SYSCALL(regs);
119 break;
120 }
121 }
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130
131 if (current->ptrace & PT_DTRACE)
132 current->thread.singlestep_syscall =
133 is_syscall(PT_REGS_IP(¤t->thread.regs));
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135
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137
138
139 if (!handled_sig)
140 restore_saved_sigmask();
141 }