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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 "os.h"
#include "signals.h"
void
runtime·dumpregs(Regs *r)
{
runtime·printf("rax %X\n", r->rax);
runtime·printf("rbx %X\n", r->rbx);
runtime·printf("rcx %X\n", r->rcx);
runtime·printf("rdx %X\n", r->rdx);
runtime·printf("rdi %X\n", r->rdi);
runtime·printf("rsi %X\n", r->rsi);
runtime·printf("rbp %X\n", r->rbp);
runtime·printf("rsp %X\n", r->rsp);
runtime·printf("r8 %X\n", r->r8 );
runtime·printf("r9 %X\n", r->r9 );
runtime·printf("r10 %X\n", r->r10);
runtime·printf("r11 %X\n", r->r11);
runtime·printf("r12 %X\n", r->r12);
runtime·printf("r13 %X\n", r->r13);
runtime·printf("r14 %X\n", r->r14);
runtime·printf("r15 %X\n", r->r15);
runtime·printf("rip %X\n", r->rip);
runtime·printf("rflags %X\n", r->rflags);
runtime·printf("cs %X\n", r->cs);
runtime·printf("fs %X\n", r->fs);
runtime·printf("gs %X\n", r->gs);
}
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;
Mcontext *mc;
Regs *r;
uintptr *sp;
byte *pc;
uc = context;
mc = uc->uc_mcontext;
r = &mc->ss;
if(gp != nil && (runtime·sigtab[sig].flags & SigPanic)) {
// 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->rip;
if((pc[0]&0xF0) == 0x40) // 64-bit REX prefix
pc++;
else 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->rip;
// Only push runtime·sigpanic if r->rip != 0.
// If r->rip == 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->rip != 0) {
sp = (uintptr*)r->rsp;
*--sp = r->rip;
r->rsp = (uintptr)sp;
}
r->rip = (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->rip);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->rip, (void*)r->rsp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
void
runtime·sigignore(int32, Siginfo*, void*)
{
}
void
runtime·signalstack(byte *p, int32 n)
{
StackT st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
runtime·sigaltstack(&st, nil);
}
void
runtime·initsig(int32 queue)
{
int32 i;
static Sigaction sa;
runtime·siginit();
sa.sa_flags |= SA_SIGINFO|SA_ONSTACK;
sa.sa_mask = 0xFFFFFFFFU;
sa.sa_tramp = runtime·sigtramp; // runtime·sigtramp's job is to call into real handler
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.__sigaction_u.__sa_sigaction = runtime·sighandler;
} else {
sa.__sigaction_u.__sa_sigaction = runtime·sigignore;
}
if(runtime·sigtab[i].flags & SigRestart)
sa.sa_flags |= SA_RESTART;
else
sa.sa_flags &= ~SA_RESTART;
runtime·sigaction(i, &sa, nil);
}
}
}
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