blob: 8015e366e63d5ffcf3db4deac5ad071004355f68 [file] [log] [blame]
// 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"
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 */
int64 sa_mask; /* signal mask to apply */
} Sigaction;
void
runtime·dumpregs(Mcontext *r)
{
runtime·printf("rax %X\n", r->mc_rax);
runtime·printf("rbx %X\n", r->mc_rbx);
runtime·printf("rcx %X\n", r->mc_rcx);
runtime·printf("rdx %X\n", r->mc_rdx);
runtime·printf("rdi %X\n", r->mc_rdi);
runtime·printf("rsi %X\n", r->mc_rsi);
runtime·printf("rbp %X\n", r->mc_rbp);
runtime·printf("rsp %X\n", r->mc_rsp);
runtime·printf("r8 %X\n", r->mc_r8 );
runtime·printf("r9 %X\n", r->mc_r9 );
runtime·printf("r10 %X\n", r->mc_r10);
runtime·printf("r11 %X\n", r->mc_r11);
runtime·printf("r12 %X\n", r->mc_r12);
runtime·printf("r13 %X\n", r->mc_r13);
runtime·printf("r14 %X\n", r->mc_r14);
runtime·printf("r15 %X\n", r->mc_r15);
runtime·printf("rip %X\n", r->mc_rip);
runtime·printf("rflags %X\n", r->mc_flags);
runtime·printf("cs %X\n", r->mc_cs);
runtime·printf("fs %X\n", r->mc_fs);
runtime·printf("gs %X\n", r->mc_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 *r;
uintptr *sp;
uc = context;
r = &uc->uc_mcontext;
if(sig == SIGPROF) {
runtime·sigprof((uint8*)r->mc_rip, (uint8*)r->mc_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->si_addr;
gp->sigpc = r->mc_rip;
// Only push runtime·sigpanic if r->mc_rip != 0.
// If r->mc_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->mc_rip != 0) {
sp = (uintptr*)r->mc_rsp;
*--sp = r->mc_rip;
r->mc_rsp = (uintptr)sp;
}
r->mc_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->mc_rip);
runtime·printf("\n");
if(runtime·gotraceback()){
runtime·traceback((void*)r->mc_rip, (void*)r->mc_rsp, 0, gp);
runtime·tracebackothers(gp);
runtime·dumpregs(r);
}
runtime·exit(2);
}
// Called from kernel on signal stack, so no stack split.
#pragma textflag 7
void
runtime·sigignore(void)
{
}
void
runtime·signalstack(byte *p, int32 n)
{
Sigaltstack st;
st.ss_sp = (int8*)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_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);
}
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;
}
void
os·sigpipe(void)
{
sigaction(SIGPIPE, SIG_DFL, false);
runtime·raisesigpipe();
}