C嵌入式开发代码疑惑，求解

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typedef struct
{
	U32 u32ApplicationVersion_Major;
	U32 u32ApplicationVersion_Minor;
	fpJumpHandler fpApplicationJumpHandler;
	U32 u32BootApplicationStartAddress;
	U32 u32BootApplicationAllocationSize;
	U32 u32UserApplicationStartAddress;
	U32 u32UserApplicationAllocationSize;
}TS_ApplicationData;


static Bool B_IsUserApplicationValid(void)
{
	TS_ApplicationData* pCurrentApplicationData;
	TS_ApplicationData* pUserApplicationData;
	U32 u32DigestLocation;
	Bool bUserApplicationValid = false;
	
	/** Get Application header data*/
	pCurrentApplicationData = P_GetApplicationData();
	
	pUserApplicationData = (TS_ApplicationData*)(pCurrentApplicationData->u32UserApplicationStartAddress +
		pCurrentApplicationData->u32UserApplicationAllocationSize - sizeof(TS_ApplicationFooter));
	
	/** Check if Flash information in Application and Boot loader Matches */
	if((pUserApplicationData->u32UserApplicationStartAddress == pCurrentApplicationData->u32UserApplicationStartAddress) && 
		(pUserApplicationData->u32UserApplicationAllocationSize == pCurrentApplicationData->u32UserApplicationAllocationSize) && 
		(pUserApplicationData->u32BootApplicationStartAddress == pCurrentApplicationData->u32BootApplicationStartAddress) &&
		(pUserApplicationData->u32BootApplicationAllocationSize == pCurrentApplicationData->u32BootApplicationAllocationSize))
	{
		u32DigestLocation = pUserApplicationData->u32UserApplicationStartAddress + 
			pUserApplicationData->u32UserApplicationAllocationSize - sizeof(TS_SHA_Digest);
	
		InitICM_Module();
		CalculateICM(pUserApplicationData->u32UserApplicationStartAddress, 
			(pUserApplicationData->u32UserApplicationAllocationSize - sizeof(TS_SHA_Digest)), (U32*)u32SHA_1_Digest);
		
		/** Check Integrity of User Application*/
		if(!memcmp((const _PTR)u32DigestLocation, u32SHA_1_Digest, sizeof(u32SHA_1_Digest)))
		{
			/** Indicate User Application is valid*/
			bUserApplicationValid = true;
		}
		else
		{
			/** Do Nothing */
		}
	}
	else
	{
		/** Do Nothing */
	}
	
	return(bUserApplicationValid);
}

pCurrentApplicationData 怎么获取不到值？pUserApplicationData的值为什么是这个值？

[dceacho]

引用

pCurrentApplicationData 怎么获取不到值？

可能是优化没了, 另外如果你的P_GetApplicationData()返回的指针是指向P_GetApplicationData()内部的一个局部变量的话会出问题的

引用

pUserApplicationData的值为什么是这个值？

预期pUserApplicationData值和pCurrentApplicationData一样? 逆向计算的话你的 sizeof(TS_ApplicationFooter)=0x100

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引用 1 楼 wangfan027 的回复:

引用

pCurrentApplicationData 怎么获取不到值？

可能是优化没了, 另外如果你的P_GetApplicationData()返回的指针是指向P_GetApplicationData()内部的一个局部变量的话会出问题的

引用

pUserApplicationData的值为什么是这个值？

预期pUserApplicationData值和pCurrentApplicationData一样? 逆向计算的话你的 sizeof(TS_ApplicationFooter)=0x100

你说的是对的，这是boot程序，后来我在app程序加上footer数据， if((pUserApplicationData->u32UserApplicationStartAddress == pCurrentApplicationData->u32UserApplicationStartAddress) && (pUserApplicationData->u32UserApplicationAllocationSize == pCurrentApplicationData->u32UserApplicationAllocationSize) && (pUserApplicationData->u32BootApplicationStartAddress == pCurrentApplicationData->u32BootApplicationStartAddress) && (pUserApplicationData->u32BootApplicationAllocationSize == pCurrentApplicationData->u32BootApplicationAllocationSize)) 这个值不知道判断出来是不是相等的，按照程序设计来说是要相等的。

[dceacho]

不知道, 你要自己动脑筋想了

    pUserApplicationData = (TS_ApplicationData*)(pCurrentApplicationData->u32UserApplicationStartAddress +
        pCurrentApplicationData->u32UserApplicationAllocationSize - sizeof(TS_ApplicationFooter));

UserApplicationData现在指向0x47ff00,如果预期是和pCurrentApplicationData指向同一个地方的话,那就是你上面写的有问题 如果UserApplicationData指向0x47ff00,指向的是pCurrentApplicationData的一个副本的话,Watch里的值表明你这个副本没初始化或者没有copy pCurrentApplicationData