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: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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@ -10,4 +10,57 @@
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#define MCOUNT_INSN_SIZE 6 /* sizeof "[++sp] = rets; call __mcount;" */
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#ifndef __ASSEMBLY__
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#ifdef CONFIG_FRAME_POINTER
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#include <linux/mm.h>
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extern inline void *return_address(unsigned int level)
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{
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unsigned long *endstack, *fp, *ret_addr;
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unsigned int current_level = 0;
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if (level == 0)
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return __builtin_return_address(0);
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fp = (unsigned long *)__builtin_frame_address(0);
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endstack = (unsigned long *)PAGE_ALIGN((unsigned long)&level);
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while (((unsigned long)fp & 0x3) == 0 && fp &&
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(fp + 1) < endstack && current_level < level) {
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fp = (unsigned long *)*fp;
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current_level++;
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}
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if (((unsigned long)fp & 0x3) == 0 && fp &&
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(fp + 1) < endstack)
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ret_addr = (unsigned long *)*(fp + 1);
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else
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ret_addr = NULL;
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return ret_addr;
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}
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#else
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extern inline void *return_address(unsigned int level)
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{
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return NULL;
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}
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#endif /* CONFIG_FRAME_POINTER */
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#define HAVE_ARCH_CALLER_ADDR
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/* inline function or macro may lead to unexpected result */
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#define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
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#define CALLER_ADDR1 ((unsigned long)return_address(1))
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#define CALLER_ADDR2 ((unsigned long)return_address(2))
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#define CALLER_ADDR3 ((unsigned long)return_address(3))
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#define CALLER_ADDR4 ((unsigned long)return_address(4))
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#define CALLER_ADDR5 ((unsigned long)return_address(5))
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#define CALLER_ADDR6 ((unsigned long)return_address(6))
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#endif /* __ASSEMBLY__ */
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#endif
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