1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "runtime.h"
#include "defs.h"
#include "signals.h"
#include "os.h"
void
dumpregs(Sigcontext *r)
{
printf("rax %X\n", r->rax);
printf("rbx %X\n", r->rbx);
printf("rcx %X\n", r->rcx);
printf("rdx %X\n", r->rdx);
printf("rdi %X\n", r->rdi);
printf("rsi %X\n", r->rsi);
printf("rbp %X\n", r->rbp);
printf("rsp %X\n", r->rsp);
printf("r8 %X\n", r->r8 );
printf("r9 %X\n", r->r9 );
printf("r10 %X\n", r->r10);
printf("r11 %X\n", r->r11);
printf("r12 %X\n", r->r12);
printf("r13 %X\n", r->r13);
printf("r14 %X\n", r->r14);
printf("r15 %X\n", r->r15);
printf("rip %X\n", r->rip);
printf("rflags %X\n", r->eflags);
printf("cs %X\n", (uint64)r->cs);
printf("fs %X\n", (uint64)r->fs);
printf("gs %X\n", (uint64)r->gs);
}
/*
* This assembler routine takes the args from registers, puts them on the stack,
* and calls sighandler().
*/
extern void sigtramp(void);
extern void sigignore(void); // just returns
extern void sigreturn(void); // calls sigreturn
void
sighandler(int32 sig, Siginfo* info, void* context)
{
Ucontext *uc;
Mcontext *mc;
Sigcontext *sc;
if(panicking) // traceback already printed
exit(2);
panicking = 1;
uc = context;
mc = &uc->uc_mcontext;
sc = (Sigcontext*)mc; // same layout, more conveient names
if(sig < 0 || sig >= NSIG)
printf("Signal %d\n", sig);
else
printf("%s\n", sigtab[sig].name);
printf("Faulting address: %p\n", *(void**)info->_sifields);
printf("PC=%X\n", sc->rip);
printf("\n");
if(gotraceback()){
traceback((void*)sc->rip, (void*)sc->rsp, (void*)sc->r15);
tracebackothers((void*)sc->r15);
dumpregs(sc);
}
breakpoint();
exit(2);
}
void
signalstack(byte *p, int32 n)
{
Sigaltstack st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
sigaltstack(&st, nil);
}
void
initsig(void)
{
static Sigaction sa;
int32 i;
sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL;
sa.sa_restorer = (void*)sigreturn;
for(i = 0; i<NSIG; i++) {
if(sigtab[i].flags) {
if(sigtab[i].flags & SigCatch)
sa.sa_handler = (void*)sigtramp;
else
sa.sa_handler = (void*)sigignore;
if(sigtab[i].flags & SigRestart)
sa.sa_flags |= SA_RESTART;
else
sa.sa_flags &= ~SA_RESTART;
rt_sigaction(i, &sa, nil, 8);
}
}
}
|
