//==================================================
// MYSEH - Matt Pietrek 1997
// Microsoft Systems Journal, January 1997
// FILE: MYSEH.CPP
// To compile: CL MYSEH.CPP
//==================================================
#include "stdafx.h"
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>

void PrintHello()
{
	printf("hello\n");
	//return 1;
}

DWORD  scratch;

EXCEPTION_DISPOSITION
__cdecl
_except_handler(
struct _EXCEPTION_RECORD *ExceptionRecord,
	void * EstablisherFrame,
struct _CONTEXT *ContextRecord,
	void * DispatcherContext )
{
	unsigned i;

	// Indicate that we made it to our exception handler
	printf( "Hello from an exception handler\n" );

	// Change EAX in the context record so that it points to someplace
	// where we can successfully write
	ContextRecord->Eax = (DWORD)&scratch;
	ContextRecord->Eip = (DWORD)PrintHello;
	// Tell the OS to restart the faulting instruction
	return ExceptionContinueExecution;
}
/* //return ExceptionContinueExecution 反汇编后 执行ret指令后就跳到下面这边了
76FAB499  mov         esp,dword ptr fs:[00000000h] 
76FAB4A0  pop         dword ptr fs:[00000000h] 
76FAB4A7  mov         esp,ebp 
76FAB4A9  pop         ebp  
76FAB4AA  ret         14h  
*/
int _tmain()
{
	DWORD handler = (DWORD)_except_handler;
	void (*pPrint)(void);
	pPrint = PrintHello;
	
	pPrint();
	
	__asm
	{                           // Build EXCEPTION_REGISTRATION record:
		push    handler         // Address of handler function
		push    FS:[0]          // Address of previous handler
		mov     FS:[0],ESP      // Install new EXECEPTION_REGISTRATION -- 保存esp, 在76FAB499  mov esp, dword ptr fs:[00000000h]处恢复
	}

	__asm
	{
		mov     eax,0           // Zero out EAX
		mov     [eax], 1        // Write to EAX to deliberately cause a fault
	}

	printf( "After writing!/n" );

	__asm
	{                           // Remove our EXECEPTION_REGISTRATION record
		mov     eax,[ESP]       // Get pointer to previous record
		mov     FS:[0], EAX     // Install previous record
		add     esp, 8          // Clean our EXECEPTION_REGISTRATION off stack
	}

	return 0;
}

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