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// 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("eax %X\n", r->eax);
printf("ebx %X\n", r->ebx);
printf("ecx %X\n", r->ecx);
printf("edx %X\n", r->edx);
printf("edi %X\n", r->edi);
printf("esi %X\n", r->esi);
printf("ebp %X\n", r->ebp);
printf("esp %X\n", r->esp);
printf("eip %X\n", r->eip);
printf("eflags %X\n", r->eflags);
printf("cs %X\n", r->cs);
printf("fs %X\n", r->fs);
printf("gs %X\n", 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;
Sigcontext *sc;
if(panicking) // traceback already printed
exit(2);
panicking = 1;
uc = context;
sc = &uc->uc_mcontext;
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->eip);
printf("\n");
if(gotraceback()){
traceback((void*)sc->eip, (void*)sc->esp, m->curg);
tracebackothers(m->curg);
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)
*(void**)sa._u = (void*)sigtramp; // handler
else
*(void**)sa._u = (void*)sigignore; // handler
if(sigtab[i].flags & SigRestart)
sa.sa_flags |= SA_RESTART;
else
sa.sa_flags &= ~SA_RESTART;
rt_sigaction(i, &sa, nil, 8);
}
}
}
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