// 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 "os.h"

void
runtime·dumpregs(Context *r)
{
	runtime·printf("eax     %x\n", r->Eax);
	runtime·printf("ebx     %x\n", r->Ebx);
	runtime·printf("ecx     %x\n", r->Ecx);
	runtime·printf("edx     %x\n", r->Edx);
	runtime·printf("edi     %x\n", r->Edi);
	runtime·printf("esi     %x\n", r->Esi);
	runtime·printf("ebp     %x\n", r->Ebp);
	runtime·printf("esp     %x\n", r->Esp);
	runtime·printf("eip     %x\n", r->Eip);
	runtime·printf("eflags  %x\n", r->EFlags);
	runtime·printf("cs      %x\n", r->SegCs);
	runtime·printf("fs      %x\n", r->SegFs);
	runtime·printf("gs      %x\n", r->SegGs);
}

void
runtime·initsig(int32)
{
	runtime·siginit();
}

uint32
runtime·sighandler(ExceptionRecord *info, void *frame, Context *r)
{
	uintptr *sp;
	G *gp;

	USED(frame);

	switch(info->ExceptionCode) {
	case EXCEPTION_BREAKPOINT:
		r->Eip--;	// because 8l generates 2 bytes for INT3
		return 1;
	}

	if((gp = m->curg) != nil && runtime·issigpanic(info->ExceptionCode)) {
		// 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 = info->ExceptionCode;
		gp->sigcode0 = info->ExceptionInformation[0];
		gp->sigcode1 = info->ExceptionInformation[1];
		gp->sigpc = r->Eip;

		// Only push runtime·sigpanic if r->eip != 0.
		// If r->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(r->Eip != 0) {
			sp = (uintptr*)r->Esp;
			*--sp = r->Eip;
			r->Esp = (uintptr)sp;
		}
		r->Eip = (uintptr)runtime·sigpanic;
		return 0;
	}

	if(runtime·panicking)	// traceback already printed
		runtime·exit(2);
	runtime·panicking = 1;

	runtime·printf("Exception %x %p %p\n", info->ExceptionCode,
		info->ExceptionInformation[0], info->ExceptionInformation[1]);

	runtime·printf("PC=%x\n", r->Eip);
	runtime·printf("\n");

	if(runtime·gotraceback()){
		runtime·traceback((void*)r->Eip, (void*)r->Esp, 0, m->curg);
		runtime·tracebackothers(m->curg);
		runtime·dumpregs(r);
	}

	runtime·exit(2);
	return 0;
}

void
runtime·resetcpuprofiler(int32 hz)
{
	// TODO: Enable profiling interrupts.
	
	m->profilehz = hz;
}