mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
7136d9c5e8
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: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
|
|
* Blackfin ftrace code
|
|
*
|
|
* Copyright 2009 Analog Devices Inc.
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#ifndef __ASM_BFIN_FTRACE_H__
|
|
#define __ASM_BFIN_FTRACE_H__
|
|
|
|
#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
|