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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 "signals_GOOS.h"
#include "os_GOOS.h"
extern void runtime·sigtramp(void);
typedef struct sigaction {
union {
void (*__sa_handler)(int32);
void (*__sa_sigaction)(int32, Siginfo*, void *);
} __sigaction_u; /* signal handler */
uint32 sa_mask; /* signal mask to apply */
int32 sa_flags; /* see signal options below */
} Sigaction;
void
runtime·dumpregs(Sigcontext *r)
{
runtime·printf("eax %x\n", r->sc_eax);
runtime·printf("ebx %x\n", r->sc_ebx);
runtime·printf("ecx %x\n", r->sc_ecx);
runtime·printf("edx %x\n", r->sc_edx);
runtime·printf("edi %x\n", r->sc_edi);
runtime·printf("esi %x\n", r->sc_esi);
runtime·printf("ebp %x\n", r->sc_ebp);
runtime·printf("esp %x\n", r->sc_esp);
runtime·printf("eip %x\n", r->sc_eip);
runtime·printf("eflags %x\n", r->sc_eflags);
runtime·printf("cs %x\n", r->sc_cs);
runtime·printf("fs %x\n", r->sc_fs);
runtime·printf("gs %x\n", r->sc_gs);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Sigcontext *r = context;
uintptr *sp;
SigTab *t;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->sc_eip, (uint8*)r->sc_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;
// 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*)((byte*)info + 12); /* si_addr */
gp->sigpc = r->sc_eip;
// Only push runtime·sigpanic if r->sc_eip != 0.
// If r->sc_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->sc_eip != 0) {
sp = (uintptr*)r->sc_esp;
*--sp = r->sc_eip;
r->sc_esp = (uintptr)sp;
}
r->sc_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->sc_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->sc_eip, (void*)r->sc_esp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·signalstack(byte *p, int32 n)
{
Sigaltstack 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(sa.__sigaction_u.__sa_sigaction == 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 = ~0ULL;
if (fn == runtime·sighandler)
fn = (void*)runtime·sigtramp;
sa.__sigaction_u.__sa_sigaction = (void*)fn;
runtime·sigaction(i, &sa, nil);
}
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