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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.h"
#include "signals.h"
#include "os.h"
void
runtime·dumpregs(Sigcontext *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);
}
/*
* This assembler routine takes the args from registers, puts them on the stack,
* and calls sighandler().
*/
extern void runtime·sigtramp(void);
extern void runtime·sigignore(void); // just returns
extern void runtime·sigreturn(void); // calls runtime·sigreturn
String
runtime·signame(int32 sig)
{
if(sig < 0 || sig >= NSIG)
return runtime·emptystring;
return runtime·gostringnocopy((byte*)runtime·sigtab[sig].name);
}
void
runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
{
Ucontext *uc;
Sigcontext *r;
uintptr *sp;
uc = context;
r = &uc->uc_mcontext;
if(gp != nil && (runtime·sigtab[sig].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 = info->si_code;
gp->sigcode1 = ((uintptr*)info)[3];
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(runtime·sigtab[sig].flags & SigQueue) {
if(runtime·sigsend(sig) || (runtime·sigtab[sig].flags & SigIgnore))
return;
runtime·exit(2); // SIGINT, SIGTERM, etc
}
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", r->eip);
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)
{
Sigaltstack st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
runtime·sigaltstack(&st, nil);
}
void
runtime·initsig(int32 queue)
{
static Sigaction sa;
runtime·siginit();
int32 i;
sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
sa.sa_mask = 0xFFFFFFFFFFFFFFFFULL;
sa.sa_restorer = (void*)runtime·sigreturn;
for(i = 0; i<NSIG; i++) {
if(runtime·sigtab[i].flags) {
if((runtime·sigtab[i].flags & SigQueue) != queue)
continue;
if(runtime·sigtab[i].flags & (SigCatch | SigQueue))
sa.k_sa_handler = (void*)runtime·sigtramp;
else
sa.k_sa_handler = (void*)runtime·sigignore;
if(runtime·sigtab[i].flags & SigRestart)
sa.sa_flags |= SA_RESTART;
else
sa.sa_flags &= ~SA_RESTART;
runtime·rt_sigaction(i, &sa, nil, 8);
}
}
}
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