diff options
Diffstat (limited to 'src/runtime/signal_386.c')
| -rw-r--r-- | src/runtime/signal_386.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/src/runtime/signal_386.c b/src/runtime/signal_386.c new file mode 100644 index 000000000..30a7488bd --- /dev/null +++ b/src/runtime/signal_386.c @@ -0,0 +1,122 @@ +// Copyright 2013 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. + +// +build darwin dragonfly freebsd linux nacl netbsd openbsd + +#include "runtime.h" +#include "defs_GOOS_GOARCH.h" +#include "os_GOOS.h" +#include "signal_GOOS_GOARCH.h" +#include "signals_GOOS.h" + +void +runtime·dumpregs(Siginfo *info, void *ctxt) +{ + USED(info); + USED(ctxt); + + runtime·printf("eax %x\n", SIG_EAX(info, ctxt)); + runtime·printf("ebx %x\n", SIG_EBX(info, ctxt)); + runtime·printf("ecx %x\n", SIG_ECX(info, ctxt)); + runtime·printf("edx %x\n", SIG_EDX(info, ctxt)); + runtime·printf("edi %x\n", SIG_EDI(info, ctxt)); + runtime·printf("esi %x\n", SIG_ESI(info, ctxt)); + runtime·printf("ebp %x\n", SIG_EBP(info, ctxt)); + runtime·printf("esp %x\n", SIG_ESP(info, ctxt)); + runtime·printf("eip %x\n", SIG_EIP(info, ctxt)); + runtime·printf("eflags %x\n", SIG_EFLAGS(info, ctxt)); + runtime·printf("cs %x\n", SIG_CS(info, ctxt)); + runtime·printf("fs %x\n", SIG_FS(info, ctxt)); + runtime·printf("gs %x\n", SIG_GS(info, ctxt)); +} + +void +runtime·sighandler(int32 sig, Siginfo *info, void *ctxt, G *gp) +{ + uintptr *sp; + SigTab *t; + bool crash; + + if(sig == SIGPROF) { + runtime·sigprof((byte*)SIG_EIP(info, ctxt), (byte*)SIG_ESP(info, ctxt), nil, gp, g->m); + return; + } + + t = &runtime·sigtab[sig]; + if(SIG_CODE0(info, ctxt) != SI_USER && (t->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 = SIG_CODE0(info, ctxt); + gp->sigcode1 = SIG_CODE1(info, ctxt); + gp->sigpc = SIG_EIP(info, ctxt); + +#ifdef GOOS_darwin + // 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 && gp->sigcode0 == 0) { + byte *pc; + pc = (byte*)gp->sigpc; + if(pc[0] == 0x66) // 16-bit instruction prefix + pc++; + if(pc[0] == 0xF6 || pc[0] == 0xF7) + gp->sigcode0 = FPE_INTDIV; + } +#endif + + // Only push runtime·sigpanic if eip != 0. + // If eip == 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(SIG_EIP(info, ctxt) != 0) { + sp = (uintptr*)SIG_ESP(info, ctxt); + *--sp = SIG_EIP(info, ctxt); + SIG_ESP(info, ctxt) = (uintptr)sp; + } + SIG_EIP(info, ctxt) = (uintptr)runtime·sigpanic; + return; + } + + if(SIG_CODE0(info, ctxt) == SI_USER || (t->flags & SigNotify)) + if(runtime·sigsend(sig)) + return; + if(t->flags & SigKill) + runtime·exit(2); + if(!(t->flags & SigThrow)) + return; + + g->m->throwing = 1; + g->m->caughtsig = gp; + runtime·startpanic(); + + 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", SIG_EIP(info, ctxt)); + if(g->m->lockedg != nil && g->m->ncgo > 0 && gp == g->m->g0) { + runtime·printf("signal arrived during cgo execution\n"); + gp = g->m->lockedg; + } + runtime·printf("\n"); + + if(runtime·gotraceback(&crash)){ + runtime·goroutineheader(gp); + runtime·tracebacktrap(SIG_EIP(info, ctxt), SIG_ESP(info, ctxt), 0, gp); + runtime·tracebackothers(gp); + runtime·printf("\n"); + runtime·dumpregs(info, ctxt); + } + + if(crash) + runtime·crash(); + + runtime·exit(2); +} |