2011-08-08 07:56:38 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "runtime.h"
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2011-12-16 13:33:58 -07:00
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#include "defs_GOOS_GOARCH.h"
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#include "signals_GOOS.h"
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#include "os_GOOS.h"
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2011-08-08 07:56:38 -06:00
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extern void runtime·sigtramp(void);
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typedef struct sigaction {
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union {
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void (*__sa_handler)(int32);
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void (*__sa_sigaction)(int32, Siginfo*, void *);
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} __sigaction_u; /* signal handler */
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uint32 sa_mask; /* signal mask to apply */
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int32 sa_flags; /* see signal options below */
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} Sigaction;
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void
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runtime·dumpregs(Sigcontext *r)
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{
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runtime·printf("rax %X\n", r->sc_rax);
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runtime·printf("rbx %X\n", r->sc_rbx);
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runtime·printf("rcx %X\n", r->sc_rcx);
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runtime·printf("rdx %X\n", r->sc_rdx);
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runtime·printf("rdi %X\n", r->sc_rdi);
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runtime·printf("rsi %X\n", r->sc_rsi);
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runtime·printf("rbp %X\n", r->sc_rbp);
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runtime·printf("rsp %X\n", r->sc_rsp);
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runtime·printf("r8 %X\n", r->sc_r8);
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runtime·printf("r9 %X\n", r->sc_r9);
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runtime·printf("r10 %X\n", r->sc_r10);
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runtime·printf("r11 %X\n", r->sc_r11);
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runtime·printf("r12 %X\n", r->sc_r12);
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runtime·printf("r13 %X\n", r->sc_r13);
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runtime·printf("r14 %X\n", r->sc_r14);
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runtime·printf("r15 %X\n", r->sc_r15);
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runtime·printf("rip %X\n", r->sc_rip);
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runtime·printf("rflags %X\n", r->sc_rflags);
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runtime·printf("cs %X\n", r->sc_cs);
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runtime·printf("fs %X\n", r->sc_fs);
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runtime·printf("gs %X\n", r->sc_gs);
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}
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String
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runtime·signame(int32 sig)
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{
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if(sig < 0 || sig >= NSIG)
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return runtime·emptystring;
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return runtime·gostringnocopy((byte*)runtime·sigtab[sig].name);
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}
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void
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runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp)
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{
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Sigcontext *r = context;
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uintptr *sp;
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if(sig == SIGPROF) {
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runtime·sigprof((uint8*)r->sc_rip,
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(uint8*)r->sc_rsp, nil, gp);
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return;
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}
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if(gp != nil && (runtime·sigtab[sig].flags & SigPanic)) {
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// Make it look like a call to the signal func.
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// Have to pass arguments out of band since
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// augmenting the stack frame would break
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// the unwinding code.
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gp->sig = sig;
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gp->sigcode0 = info->si_code;
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gp->sigcode1 = *(uintptr*)((byte*)info + 16); /* si_addr */
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gp->sigpc = r->sc_rip;
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// Only push runtime·sigpanic if r->mc_rip != 0.
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// If r->mc_rip == 0, probably panicked because of a
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// call to a nil func. Not pushing that onto sp will
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// make the trace look like a call to runtime·sigpanic instead.
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// (Otherwise the trace will end at runtime·sigpanic and we
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// won't get to see who faulted.)
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if(r->sc_rip != 0) {
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sp = (uintptr*)r->sc_rsp;
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*--sp = r->sc_rip;
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r->sc_rsp = (uintptr)sp;
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}
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r->sc_rip = (uintptr)runtime·sigpanic;
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return;
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}
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if(runtime·sigtab[sig].flags & SigQueue) {
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if(runtime·sigsend(sig)
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|| (runtime·sigtab[sig].flags & SigIgnore))
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return;
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runtime·exit(2); // SIGINT, SIGTERM, etc
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}
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if(runtime·panicking) // traceback already printed
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runtime·exit(2);
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runtime·panicking = 1;
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if(sig < 0 || sig >= NSIG)
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runtime·printf("Signal %d\n", sig);
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else
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runtime·printf("%s\n", runtime·sigtab[sig].name);
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runtime·printf("PC=%X\n", r->sc_rip);
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runtime·printf("\n");
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if(runtime·gotraceback()){
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runtime·traceback((void*)r->sc_rip, (void*)r->sc_rsp, 0, gp);
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runtime·tracebackothers(gp);
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runtime·dumpregs(r);
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}
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runtime·exit(2);
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}
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// Called from kernel on signal stack, so no stack split.
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#pragma textflag 7
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void
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runtime·sigignore(void)
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{
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}
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void
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runtime·signalstack(byte *p, int32 n)
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{
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Sigaltstack st;
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st.ss_sp = (int8*)p;
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st.ss_size = n;
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st.ss_flags = 0;
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runtime·sigaltstack(&st, nil);
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}
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static void
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sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart)
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{
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Sigaction sa;
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runtime·memclr((byte*)&sa, sizeof sa);
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sa.sa_flags = SA_SIGINFO|SA_ONSTACK;
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if(restart)
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sa.sa_flags |= SA_RESTART;
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sa.sa_mask = ~0ULL;
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if (fn == runtime·sighandler)
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fn = (void*)runtime·sigtramp;
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sa.__sigaction_u.__sa_sigaction = (void*)fn;
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runtime·sigaction(i, &sa, nil);
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}
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void
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runtime·initsig(int32 queue)
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{
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int32 i;
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void *fn;
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runtime·siginit();
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for(i = 0; i<NSIG; i++) {
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if(runtime·sigtab[i].flags) {
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if((runtime·sigtab[i].flags & SigQueue) != queue)
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continue;
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if(runtime·sigtab[i].flags & (SigCatch | SigQueue))
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fn = runtime·sighandler;
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else
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fn = runtime·sigignore;
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sigaction(i, fn, (runtime·sigtab[i].flags & SigRestart) != 0);
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}
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}
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}
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void
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runtime·resetcpuprofiler(int32 hz)
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{
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Itimerval it;
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runtime·memclr((byte*)&it, sizeof it);
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if(hz == 0) {
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runtime·setitimer(ITIMER_PROF, &it, nil);
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sigaction(SIGPROF, SIG_IGN, true);
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} else {
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sigaction(SIGPROF, runtime·sighandler, true);
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it.it_interval.tv_sec = 0;
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it.it_interval.tv_usec = 1000000 / hz;
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it.it_value = it.it_interval;
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runtime·setitimer(ITIMER_PROF, &it, nil);
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}
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m->profilehz = hz;
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}
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void
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os·sigpipe(void)
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{
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sigaction(SIGPIPE, SIG_DFL, false);
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runtime·raisesigpipe();
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}
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