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https://github.com/golang/go
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59ce067da8
A terminal panic (one that prints a stack trace and exits) has been calling runtime.breakpoint before calling exit, so that if running under a debugger, the debugger can take control. When not running under a debugger, though, this causes an additional SIGTRAP on Unix and pop-up dialogs on Windows. Support for debugging Go programs has gotten good enough that we can rely on the debugger to set its own breakpoint on runtime.exit if it wants to look around. R=r, r2 CC=golang-dev https://golang.org/cl/4222043
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
// 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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#include "defs.h"
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#include "os.h"
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void
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runtime·dumpregs(Context *r)
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{
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runtime·printf("eax %x\n", r->Eax);
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runtime·printf("ebx %x\n", r->Ebx);
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runtime·printf("ecx %x\n", r->Ecx);
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runtime·printf("edx %x\n", r->Edx);
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runtime·printf("edi %x\n", r->Edi);
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runtime·printf("esi %x\n", r->Esi);
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runtime·printf("ebp %x\n", r->Ebp);
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runtime·printf("esp %x\n", r->Esp);
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runtime·printf("eip %x\n", r->Eip);
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runtime·printf("eflags %x\n", r->EFlags);
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runtime·printf("cs %x\n", r->SegCs);
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runtime·printf("fs %x\n", r->SegFs);
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runtime·printf("gs %x\n", r->SegGs);
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}
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void
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runtime·initsig(int32)
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{
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runtime·siginit();
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}
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uint32
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runtime·sighandler(ExceptionRecord *info, void *frame, Context *r)
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{
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uintptr *sp;
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G *gp;
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USED(frame);
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switch(info->ExceptionCode) {
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case EXCEPTION_BREAKPOINT:
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r->Eip--; // because 8l generates 2 bytes for INT3
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return 1;
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}
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if((gp = m->curg) != nil && runtime·issigpanic(info->ExceptionCode)) {
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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 = info->ExceptionCode;
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gp->sigcode0 = info->ExceptionInformation[0];
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gp->sigcode1 = info->ExceptionInformation[1];
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gp->sigpc = r->Eip;
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// Only push runtime·sigpanic if r->eip != 0.
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// If r->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 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->Eip != 0) {
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sp = (uintptr*)r->Esp;
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*--sp = r->Eip;
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r->Esp = (uintptr)sp;
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}
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r->Eip = (uintptr)runtime·sigpanic;
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return 0;
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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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runtime·printf("Exception %x %p %p\n", info->ExceptionCode,
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info->ExceptionInformation[0], info->ExceptionInformation[1]);
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runtime·printf("PC=%x\n", r->Eip);
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runtime·printf("\n");
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if(runtime·gotraceback()){
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runtime·traceback((void*)r->Eip, (void*)r->Esp, 0, m->curg);
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runtime·tracebackothers(m->curg);
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runtime·dumpregs(r);
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}
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runtime·exit(2);
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return 0;
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}
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