gecko-dev/ef/Debugger/Win32BreakPoint.cpp
1999-11-02 06:38:29 +00:00

63 lines
2.0 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include <stdio.h>
#include "Fundamentals.h"
#include <windows.h>
unsigned char old_instruction;
extern "C" int
SetBreakPoint(void *pc)
{
old_instruction = (*((unsigned char *) pc));
*((unsigned char *) pc) = 0xcc; /* break point opcode */
fprintf(stderr, "breakpoint at: %x\n", pc);
fprintf(stderr, "value: %x\n", &old_instruction);
/* Need to flush icache here */
return 0;
}
__declspec(dllexport) EXCEPTION_DISPOSITION __cdecl
_arun_handler(struct _EXCEPTION_RECORD
*ExceptionRecord,
void * EstablisherFrame,
struct _CONTEXT *ContextRecord,
void * DispatcherContext )
{
// Indicate that we made it to our exception handler
fprintf(stderr, "Faulted with: 0x%x\n",ExceptionRecord->ExceptionCode);
// Change EIP in the context record so that it points to someplace
// where we can successfully continue
switch (ExceptionRecord->ExceptionCode) {
case STATUS_BREAKPOINT:
fprintf(stderr, "Restoring the instruction at %x\n",
ContextRecord->Eip);
(*(unsigned char *) (ContextRecord->Eip)) = old_instruction;
fprintf(stderr, "Restored: %x\n", old_instruction);
// Reexecute the same instruction
return ExceptionContinueExecution;
default:
return ExceptionContinueSearch;
}
}