mirror of
https://github.com/golang/go
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76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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#include "signals.h"
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/*
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* This assembler routine takes the args from registers, puts them on the stack,
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* and calls sighandler().
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*/
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extern void sigtramp();
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/*
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* Rudimentary reverse-engineered definition of signal interface.
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* You'd think it would be documented.
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*/
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typedef struct siginfo {
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int32 si_signo; /* signal number */
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int32 si_errno; /* errno association */
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int32 si_code; /* signal code */
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int32 si_status; /* exit value */
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void *si_addr; /* faulting address */
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/* more stuff here */
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} siginfo;
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typedef struct sigaction {
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union {
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void (*sa_handler)(int32);
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void (*sa_sigaction)(int32, siginfo *, void *);
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} u; /* signal handler */
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int32 sa_flags; /* see signal options below */
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uint8 sa_mask[2]; /* signal mask to apply. BUG: 2 is a guess */
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} sigaction;
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void
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sighandler(int32 sig, siginfo* info, void** context) {
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int32 i;
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if(sig < 0 || sig >= NSIG){
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prints("Signal ");
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sys_printint(sig);
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}else{
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prints(sigtab[sig].name);
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}
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prints("\nFaulting address: 0x");
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sys_printpointer(info->si_addr);
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prints("\nPC: 0x");
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sys_printpointer(context[21]);
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prints("\nSP: 0x");
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sys_printpointer(context[20]);
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prints("\n");
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traceback(context[21], context[20]); /* empirically discovered locations */
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sys_breakpoint();
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sys_exit(2);
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}
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sigaction a;
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void
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initsig(void)
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{
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int32 i;
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a.u.sa_sigaction = (void*)sigtramp;
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a.sa_flags = 1|2|4|0x10000000|0x20000000|0x40000000|0x80000000;
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//a.sa_flags |= SA_SIGINFO;
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a.sa_flags = ~0; /* BUG: why is this needed? */
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for(i=0; i<sizeof(a.sa_mask); i++)
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a.sa_mask[i] = 0xFF;
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//a.sa_mask[1] = (1 << (11-1));
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for(i = 0; i <NSIG; i++)
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if(sigtab[i].catch){
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sys_rt_sigaction(i, &a, (void*)0, 8);
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}
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}
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