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

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
......@@ -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
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