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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("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->eflags);
runtime·printf("cs %X\n", (uint64)r->cs);
runtime·printf("fs %X\n", (uint64)r->fs);
runtime·printf("gs %X\n", (uint64)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;
Mcontext *mc;
Sigcontext *r;
uintptr *sp;
uc = context;
mc = &uc->uc_mcontext;
r = (Sigcontext*)mc; // same layout, more conveient names
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->rip, (uint8*)r->rsp, nil, gp);
return;
}
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)[2];
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·signalstack(byte *p, int32 n)
{
Sigaltstack st;
st.ss_sp = p;
st.ss_size = n;
st.ss_flags = 0;
runtime·sigaltstack(&st, nil);
}
static void
sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
{
Sigaction sa;
runtime·memclr((byte*)&sa, sizeof sa);
sa.sa_flags = SA_ONSTACK | SA_SIGINFO | SA_RESTORER;
if(restart)
sa.sa_flags |= SA_RESTART;
sa.sa_mask = ~0ULL;
sa.sa_restorer = (void*)runtime·sigreturn;
if(fn == runtime·sighandler)
fn = (void*)runtime·sigtramp;
sa.sa_handler = fn;
runtime·rt_sigaction(i, &sa, nil, 8);
}
void
runtime·initsig(int32 queue)
{
int32 i;
void *fn;
runtime·siginit();
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))
fn = runtime·sighandler;
else
fn = runtime·sigignore;
sigaction(i, fn, (runtime·sigtab[i].flags & SigRestart) != 0);
}
}
}
void
runtime·resetcpuprofiler(int32 hz)
{
Itimerval it;
runtime·memclr((byte*)&it, sizeof it);
if(hz == 0) {
runtime·setitimer(ITIMER_PROF, &it, nil);
sigaction(SIGPROF, SIG_IGN, true);
} else {
sigaction(SIGPROF, runtime·sighandler, true);
it.it_interval.tv_sec = 0;
it.it_interval.tv_usec = 1000000 / hz;
it.it_value = it.it_interval;
runtime·setitimer(ITIMER_PROF, &it, nil);
}
m->profilehz = hz;
}
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