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how to use global pointer of C in assembly program

/*******************************************/
/*compiler Keil C51 v6.23*/
/*name:main*/
unsigned char xdata temp;
unsigned char xdata *p;
void func(void);
void main(void)
{	
	unsigned char xdata i;
 	while(1)
	{
		p = &temp;	
		*p = 98;	
		func();
		i = *p;
	}
}
/******************************************/
/*--------------------------------------
compile following program to assembly program, then link with the main function.ERROR!!! Why and how to chang the assembly program.please help me,thank you.!
------------------------------------------*/
#pragma src(MYPTR.A51) small

extern unsigned char xdata *p;

void func(void)
{	
	*p = 0xdd;
}
my E-mail:inspra@xjgroup.com
name:huangjian

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