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Commit d26cddbb authored by Matt Fleming's avatar Matt Fleming
Browse files

sh: tracing: Use the DWARF unwinder for CALLER_ADDRx 



The major reason for implementing the DWARF unwinder in the first place
was so that we could stop using __builtin_return_address(n), which
doesn't work on SH for n > 0.

Signed-off-by: default avatarMatt Fleming <matt@console-pimps.org>
parent 5e3679c5

arch/sh/include/asm/ftrace.h

+47 −0
Original line number Diff line number Diff line
@@ -32,6 +32,53 @@ static inline unsigned long ftrace_call_adjust(unsigned long addr) 
	return addr;

}





#ifdef CONFIG_DWARF_UNWINDER

#include <asm/dwarf.h>



#define HAVE_ARCH_CALLER_ADDR



static inline unsigned long dwarf_return_address(int depth)

{

	struct dwarf_frame *frame;

	unsigned long ra;

	int i;



	for (i = 0, frame = NULL, ra = 0; i <= depth; i++) {

		struct dwarf_frame *tmp;



		tmp = dwarf_unwind_stack(ra, frame);



		if (frame)

			dwarf_free_frame(frame);



		frame = tmp;



		if (!frame || !frame->return_addr)

			break;



		ra = frame->return_addr;

	}



	/* Failed to unwind the stack to the specified depth. */

	WARN_ON(i != depth + 1);



	if (frame)

		dwarf_free_frame(frame);



	return ra;

}



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

#define CALLER_ADDR1 dwarf_return_address(1)

#define CALLER_ADDR2 dwarf_return_address(2)

#define CALLER_ADDR3 dwarf_return_address(3)

#define CALLER_ADDR4 dwarf_return_address(4)

#define CALLER_ADDR5 dwarf_return_address(5)

#define CALLER_ADDR6 dwarf_return_address(6)



#endif /* CONFIG_DWARF_UNWINDER */



#endif /* __ASSEMBLY__ */

#endif /* CONFIG_FUNCTION_TRACER */