2009-12-15 19:21:29 -07:00
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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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2009-11-18 00:58:51 -07:00
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#include "runtime.h"
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#include "defs.h"
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#include "signals.h"
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#include "os.h"
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extern void 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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int32 sa_flags; /* see signal options below */
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int64 sa_mask; /* signal mask to apply */
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} Sigaction;
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void
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2009-11-20 14:08:16 -07:00
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dumpregs(Mcontext *r)
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2009-11-18 00:58:51 -07:00
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{
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2009-11-20 14:08:16 -07:00
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printf("eax %x\n", r->mc_eax);
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printf("ebx %x\n", r->mc_ebx);
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printf("ecx %x\n", r->mc_ecx);
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printf("edx %x\n", r->mc_edx);
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printf("edi %x\n", r->mc_edi);
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printf("esi %x\n", r->mc_esi);
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printf("ebp %x\n", r->mc_ebp);
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printf("esp %x\n", r->mc_esp);
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printf("eip %x\n", r->mc_eip);
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printf("eflags %x\n", r->mc_eflags);
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printf("cs %x\n", r->mc_cs);
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printf("fs %x\n", r->mc_fs);
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printf("gs %x\n", r->mc_gs);
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2009-11-18 00:58:51 -07:00
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}
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2009-12-15 19:21:29 -07:00
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String
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signame(int32 sig)
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{
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if(sig < 0 || sig >= NSIG)
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return emptystring;
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2010-05-19 22:33:31 -06:00
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return gostringnocopy((byte*)sigtab[sig].name);
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2009-12-15 19:21:29 -07:00
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}
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2009-11-18 00:58:51 -07:00
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void
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sighandler(int32 sig, Siginfo* info, void* context)
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{
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Ucontext *uc;
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2010-04-08 19:15:30 -06:00
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Mcontext *r;
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2010-04-08 22:13:42 -06:00
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G *gp;
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uintptr *sp;
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2010-04-08 19:15:30 -06:00
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uc = context;
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r = &uc->uc_mcontext;
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if((gp = m->curg) != nil && (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)info->si_addr;
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2010-04-13 23:31:47 -06:00
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// Only push sigpanic if r->mc_eip != 0.
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// If r->mc_eip == 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 sigpanic instead.
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// (Otherwise the trace will end at sigpanic and we
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// won't get to see who faulted.)
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if(r->mc_eip != 0) {
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sp = (uintptr*)r->mc_esp;
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*--sp = r->mc_eip;
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r->mc_esp = (uintptr)sp;
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}
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2010-04-08 19:15:30 -06:00
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r->mc_eip = (uintptr)sigpanic;
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return;
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}
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2009-11-18 00:58:51 -07:00
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2009-12-15 19:21:29 -07:00
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if(sigtab[sig].flags & SigQueue) {
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2009-12-16 21:20:50 -07:00
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if(sigsend(sig) || (sigtab[sig].flags & SigIgnore))
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return;
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exit(2); // SIGINT, SIGTERM, etc
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2009-12-15 19:21:29 -07:00
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}
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2009-11-18 00:58:51 -07:00
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if(panicking) // traceback already printed
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exit(2);
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panicking = 1;
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if(sig < 0 || sig >= NSIG)
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printf("Signal %d\n", sig);
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else
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printf("%s\n", sigtab[sig].name);
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2010-04-08 19:15:30 -06:00
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printf("PC=%X\n", r->mc_eip);
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2009-11-18 00:58:51 -07:00
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printf("\n");
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if(gotraceback()){
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2010-04-08 19:15:30 -06:00
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traceback((void*)r->mc_eip, (void*)r->mc_esp, 0, m->curg);
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2009-11-18 00:58:51 -07:00
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tracebackothers(m->curg);
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2010-04-08 19:15:30 -06:00
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dumpregs(r);
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2009-11-18 00:58:51 -07:00
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}
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breakpoint();
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exit(2);
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}
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void
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sigignore(void)
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{
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}
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void
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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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sigaltstack(&st, nil);
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}
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void
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2010-06-28 18:14:17 -06:00
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initsig(int32 queue)
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2009-11-18 00:58:51 -07:00
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{
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static Sigaction sa;
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2009-12-15 19:21:29 -07:00
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siginit();
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2009-11-18 00:58:51 -07:00
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int32 i;
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sa.sa_flags |= SA_ONSTACK | SA_SIGINFO;
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sa.sa_mask = ~0x0ull;
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for(i = 0; i < NSIG; i++) {
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if(sigtab[i].flags) {
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2010-06-28 18:14:17 -06:00
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if((sigtab[i].flags & SigQueue) != queue)
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continue;
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2009-12-15 19:21:29 -07:00
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if(sigtab[i].flags & (SigCatch | SigQueue))
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2009-12-08 19:18:04 -07:00
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sa.__sigaction_u.__sa_sigaction = (void*) sigtramp;
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2009-11-18 00:58:51 -07:00
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else
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2009-12-08 19:18:04 -07:00
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sa.__sigaction_u.__sa_sigaction = (void*) sigignore;
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2009-11-18 00:58:51 -07:00
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if(sigtab[i].flags & SigRestart)
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sa.sa_flags |= SA_RESTART;
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else
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sa.sa_flags &= ~SA_RESTART;
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sigaction(i, &sa, nil);
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}
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}
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}
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