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// Copyright 2013 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.
// +build darwin dragonfly freebsd linux netbsd openbsd
#include "runtime.h"
#include "defs_GOOS_GOARCH.h"
#include "os_GOOS.h"
#include "signal_GOOS_GOARCH.h"
#include "signals_GOOS.h"
void
runtime·dumpregs(Siginfo *info, void *ctxt)
{
USED(info);
USED(ctxt);
runtime·printf("eax %x\n", SIG_EAX(info, ctxt));
runtime·printf("ebx %x\n", SIG_EBX(info, ctxt));
runtime·printf("ecx %x\n", SIG_ECX(info, ctxt));
runtime·printf("edx %x\n", SIG_EDX(info, ctxt));
runtime·printf("edi %x\n", SIG_EDI(info, ctxt));
runtime·printf("esi %x\n", SIG_ESI(info, ctxt));
runtime·printf("ebp %x\n", SIG_EBP(info, ctxt));
runtime·printf("esp %x\n", SIG_ESP(info, ctxt));
runtime·printf("eip %x\n", SIG_EIP(info, ctxt));
runtime·printf("eflags %x\n", SIG_EFLAGS(info, ctxt));
runtime·printf("cs %x\n", SIG_CS(info, ctxt));
runtime·printf("fs %x\n", SIG_FS(info, ctxt));
runtime·printf("gs %x\n", SIG_GS(info, ctxt));
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
{
uintptr *sp;
SigTab *t;
bool crash;
if(sig == SIGPROF) {
runtime·sigprof((byte*)SIG_EIP(info, ctxt), (byte*)SIG_ESP(info, ctxt), nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// Make it look like a call to the signal func.
// Have to pass arguments out of band since
// augmenting the stack frame would break
// the unwinding code.
gp->sig = sig;
gp->sigcode0 = SIG_CODE0(info, ctxt);
gp->sigcode1 = SIG_CODE1(info, ctxt);
gp->sigpc = SIG_EIP(info, ctxt);
#ifdef GOOS_darwin
// Work around Leopard bug that doesn't set FPE_INTDIV.
// Look at instruction to see if it is a divide.
// Not necessary in Snow Leopard (si_code will be != 0).
if(sig == SIGFPE && gp->sigcode0 == 0) {
byte *pc;
pc = (byte*)gp->sigpc;
if(pc[0] == 0x66) // 16-bit instruction prefix
pc++;
if(pc[0] == 0xF6 || pc[0] == 0xF7)
gp->sigcode0 = FPE_INTDIV;
}
#endif
// Only push runtime·sigpanic if eip != 0.
// If eip == 0, probably panicked because of a
// call to a nil func. Not pushing that onto sp will
// make the trace look like a call to runtime·sigpanic instead.
// (Otherwise the trace will end at runtime·sigpanic and we
// won't get to see who faulted.)
if(SIG_EIP(info, ctxt) != 0) {
sp = (uintptr*)SIG_ESP(info, ctxt);
*--sp = SIG_EIP(info, ctxt);
SIG_ESP(info, ctxt) = (uintptr)sp;
}
SIG_EIP(info, ctxt) = (uintptr)runtime·sigpanic;
return;
}
if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
m->throwing = 1;
m->caughtsig = gp;
runtime·startpanic();
if(sig < 0 || sig >= NSIG)
runtime·printf("Signal %d\n", sig);
else
runtime·printf("%s\n", runtime·sigtab[sig].name);
runtime·printf("PC=%x\n", SIG_EIP(info, ctxt));
if(m->lockedg != nil && m->ncgo > 0 && gp == m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·traceback(SIG_EIP(info, ctxt), SIG_ESP(info, ctxt), 0, gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(info, ctxt);
}
if(crash)
runtime·crash();
runtime·exit(2);
}
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