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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_GOOS_GOARCH.h"
#include "os_GOOS.h"
#include "signals_GOOS.h"
void
runtime·dumpregs(Regs32 *r)
{
runtime·printf("eax %x\n", r->eax);
runtime·printf("ebx %x\n", r->ebx);
runtime·printf("ecx %x\n", r->ecx);
runtime·printf("edx %x\n", r->edx);
runtime·printf("edi %x\n", r->edi);
runtime·printf("esi %x\n", r->esi);
runtime·printf("ebp %x\n", r->ebp);
runtime·printf("esp %x\n", r->esp);
runtime·printf("eip %x\n", r->eip);
runtime·printf("eflags %x\n", r->eflags);
runtime·printf("cs %x\n", r->cs);
runtime·printf("fs %x\n", r->fs);
runtime·printf("gs %x\n", r->gs);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Mcontext32 *mc;
Regs32 *r;
uintptr *sp;
byte *pc;
SigTab *t;
uc = context;
mc = uc->uc_mcontext;
r = &mc->ss;
if(sig == SIGPROF) {
if(gp != m->g0 && gp != m->gsignal)
runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp);
return;
}
t = &runtime·sigtab[sig];
if(info->si_code != SI_USER && (t->flags & SigPanic)) {
if(gp == nil || gp == m->g0)
goto Throw;
// 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 && info->si_code == 0) {
pc = (byte*)r->eip;
if(pc[0] == 0x66) // 16-bit instruction prefix
pc++;
if(pc[0] == 0xF6 || pc[0] == 0xF7)
info->si_code = FPE_INTDIV;
}
// 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 = info->si_code;
gp->sigcode1 = (uintptr)info->si_addr;
gp->sigpc = r->eip;
// Only push runtime·sigpanic if r->eip != 0.
// If r->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(r->eip != 0) {
sp = (uintptr*)r->esp;
*--sp = r->eip;
r->esp = (uintptr)sp;
}
r->eip = (uintptr)runtime·sigpanic;
return;
}
if(info->si_code == SI_USER || (t->flags & SigNotify))
if(runtime·sigsend(sig))
return;
if(t->flags & SigKill)
runtime·exit(2);
if(!(t->flags & SigThrow))
return;
Throw:
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", r->eip);
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()){
runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·signalstack(byte *p, int32 n)
{
StackT st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
if(p == nil)
st.ss_flags = SS_DISABLE;
runtime·sigaltstack(&st, nil);
}
void
runtime·setsig(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
{
Sigaction sa;
// If SIGHUP handler is SIG_IGN, assume running
// under nohup and do not set explicit handler.
if(i == SIGHUP) {
runtime·memclr((byte*)&sa, sizeof sa);
runtime·sigaction(i, nil, &sa);
if(*(void**)sa.__sigaction_u == SIG_IGN)
return;
}
runtime·memclr((byte*)&sa, sizeof sa);
sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
if(restart)
sa.sa_flags |= SA_RESTART;
sa.sa_mask = ~0U;
sa.sa_tramp = (void*)runtime·sigtramp; // runtime·sigtramp's job is to call into real handler
*(uintptr*)sa.__sigaction_u = (uintptr)fn;
runtime·sigaction(i, &sa, nil);
}
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