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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.
// +build darwin dragonfly freebsd linux nacl 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("trap %x\n", SIG_TRAP(info, ctxt));
runtime·printf("error %x\n", SIG_ERROR(info, ctxt));
runtime·printf("oldmask %x\n", SIG_OLDMASK(info, ctxt));
runtime·printf("r0 %x\n", SIG_R0(info, ctxt));
runtime·printf("r1 %x\n", SIG_R1(info, ctxt));
runtime·printf("r2 %x\n", SIG_R2(info, ctxt));
runtime·printf("r3 %x\n", SIG_R3(info, ctxt));
runtime·printf("r4 %x\n", SIG_R4(info, ctxt));
runtime·printf("r5 %x\n", SIG_R5(info, ctxt));
runtime·printf("r6 %x\n", SIG_R6(info, ctxt));
runtime·printf("r7 %x\n", SIG_R7(info, ctxt));
runtime·printf("r8 %x\n", SIG_R8(info, ctxt));
runtime·printf("r9 %x\n", SIG_R9(info, ctxt));
runtime·printf("r10 %x\n", SIG_R10(info, ctxt));
runtime·printf("fp %x\n", SIG_FP(info, ctxt));
runtime·printf("ip %x\n", SIG_IP(info, ctxt));
runtime·printf("sp %x\n", SIG_SP(info, ctxt));
runtime·printf("lr %x\n", SIG_LR(info, ctxt));
runtime·printf("pc %x\n", SIG_PC(info, ctxt));
runtime·printf("cpsr %x\n", SIG_CPSR(info, ctxt));
runtime·printf("fault %x\n", SIG_FAULT(info, ctxt));
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp)
{
SigTab *t;
bool crash;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)SIG_PC(info, ctxt), (uint8*)SIG_SP(info, ctxt), (uint8*)SIG_LR(info, ctxt), gp, g->m);
return;
}
t = &runtime·sigtab[sig];
if(SIG_CODE0(info, ctxt) != SI_USER && (t->flags & SigPanic)) {
// 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_FAULT(info, ctxt);
gp->sigpc = SIG_PC(info, ctxt);
// We arrange lr, and pc to pretend the panicking
// function calls sigpanic directly.
// Always save LR to stack so that panics in leaf
// functions are correctly handled. This smashes
// the stack frame but we're not going back there
// anyway.
SIG_SP(info, ctxt) -= 4;
*(uint32*)SIG_SP(info, ctxt) = SIG_LR(info, ctxt);
// Don't bother saving PC if it's zero, which is
// probably a call to a nil func: the old link register
// is more useful in the stack trace.
if(gp->sigpc != 0)
SIG_LR(info, ctxt) = gp->sigpc;
// In case we are panicking from external C code
SIG_R10(info, ctxt) = (uintptr)gp;
SIG_PC(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;
g->m->throwing = 1;
g->m->caughtsig = gp;
if(runtime·panicking) // traceback already printed
runtime·exit(2);
runtime·panicking = 1;
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_PC(info, ctxt));
if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) {
runtime·printf("signal arrived during cgo execution\n");
gp = g->m->lockedg;
}
runtime·printf("\n");
if(runtime·gotraceback(&crash)){
runtime·goroutineheader(gp);
runtime·tracebacktrap(SIG_PC(info, ctxt), SIG_SP(info, ctxt), SIG_LR(info, ctxt), gp);
runtime·tracebackothers(gp);
runtime·printf("\n");
runtime·dumpregs(info, ctxt);
}
if(crash)
runtime·crash();
runtime·exit(2);
}
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