mirror of
https://github.com/golang/go
synced 2024-10-04 22:31:22 -06:00
86d509b463
* Handle p==nil in signalstack by setting SS_DISABLE flag. * Make minit only allocate a signal g if there's not one already. R=golang-dev, r CC=golang-dev https://golang.org/cl/7323072
155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
// 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 */
|
|
int32 sa_flags; /* see signal options below */
|
|
Sigset sa_mask; /* signal mask to apply */
|
|
} Sigaction;
|
|
|
|
void
|
|
runtime·dumpregs(Mcontext *r)
|
|
{
|
|
runtime·printf("eax %x\n", r->mc_eax);
|
|
runtime·printf("ebx %x\n", r->mc_ebx);
|
|
runtime·printf("ecx %x\n", r->mc_ecx);
|
|
runtime·printf("edx %x\n", r->mc_edx);
|
|
runtime·printf("edi %x\n", r->mc_edi);
|
|
runtime·printf("esi %x\n", r->mc_esi);
|
|
runtime·printf("ebp %x\n", r->mc_ebp);
|
|
runtime·printf("esp %x\n", r->mc_esp);
|
|
runtime·printf("eip %x\n", r->mc_eip);
|
|
runtime·printf("eflags %x\n", r->mc_eflags);
|
|
runtime·printf("cs %x\n", r->mc_cs);
|
|
runtime·printf("fs %x\n", r->mc_fs);
|
|
runtime·printf("gs %x\n", r->mc_gs);
|
|
}
|
|
|
|
void
|
|
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
|
|
{
|
|
Ucontext *uc;
|
|
Mcontext *r;
|
|
uintptr *sp;
|
|
SigTab *t;
|
|
|
|
uc = context;
|
|
r = &uc->uc_mcontext;
|
|
|
|
if(sig == SIGPROF) {
|
|
runtime·sigprof((uint8*)r->mc_eip, (uint8*)r->mc_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)info->si_addr;
|
|
gp->sigpc = r->mc_eip;
|
|
|
|
// Only push runtime·sigpanic if r->mc_eip != 0.
|
|
// If r->mc_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->mc_eip != 0) {
|
|
sp = (uintptr*)r->mc_esp;
|
|
*--sp = r->mc_eip;
|
|
r->mc_esp = (uintptr)sp;
|
|
}
|
|
r->mc_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->mc_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->mc_eip, (void*)r->mc_esp, 0, gp);
|
|
runtime·tracebackothers(gp);
|
|
runtime·dumpregs(r);
|
|
}
|
|
|
|
runtime·exit(2);
|
|
}
|
|
|
|
void
|
|
runtime·signalstack(byte *p, int32 n)
|
|
{
|
|
Sigaltstack st;
|
|
|
|
st.ss_sp = (int8*)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.__bits[0] = ~(uint32)0;
|
|
sa.sa_mask.__bits[1] = ~(uint32)0;
|
|
sa.sa_mask.__bits[2] = ~(uint32)0;
|
|
sa.sa_mask.__bits[3] = ~(uint32)0;
|
|
if (fn == runtime·sighandler)
|
|
fn = (void*)runtime·sigtramp;
|
|
sa.__sigaction_u.__sa_sigaction = (void*)fn;
|
|
runtime·sigaction(i, &sa, nil);
|
|
}
|