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Commit 7136d9c5 authored by Yi Li's avatar Yi Li Committed by Mike Frysinger
Browse files

Blackfin: add CALLER_ADDR ftrace macros 



Since GCC doesn't support __builtin_frame_address(n) where n!=0, add our
own function to walk the stack frame pointers.

Signed-off-by: default avatarYi Li <yi.li@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 652afdc3

arch/blackfin/include/asm/ftrace.h

+53 −0
Original line number Diff line number Diff line
@@ -10,4 +10,57 @@ 


#define MCOUNT_INSN_SIZE	6 /* sizeof "[++sp] = rets; call __mcount;" */



#ifndef __ASSEMBLY__



#ifdef CONFIG_FRAME_POINTER

#include <linux/mm.h>



extern inline void *return_address(unsigned int level)

{

	unsigned long *endstack, *fp, *ret_addr;

	unsigned int current_level = 0;



	if (level == 0)

		return __builtin_return_address(0);



	fp = (unsigned long *)__builtin_frame_address(0);

	endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);



	while (((unsigned long)fp & 0x3) == 0 && fp &&

	       (fp + 1) < endstack && current_level < level) {

		fp = (unsigned long *)*fp;

		current_level++;

	}



	if (((unsigned long)fp & 0x3) == 0 && fp &&

	    (fp + 1) < endstack)

		ret_addr = (unsigned long *)*(fp + 1);

	else

		ret_addr = NULL;



	return ret_addr;

}



#else



extern inline void *return_address(unsigned int level)

{

	return NULL;

}



#endif /* CONFIG_FRAME_POINTER */



#define HAVE_ARCH_CALLER_ADDR



/* inline function or macro may lead to unexpected result */

#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))

#define CALLER_ADDR1 ((unsigned long)return_address(1))

#define CALLER_ADDR2 ((unsigned long)return_address(2))

#define CALLER_ADDR3 ((unsigned long)return_address(3))

#define CALLER_ADDR4 ((unsigned long)return_address(4))

#define CALLER_ADDR5 ((unsigned long)return_address(5))

#define CALLER_ADDR6 ((unsigned long)return_address(6))



#endif /* __ASSEMBLY__ */



#endif