arch/sh/include/asm/ftrace.h

#ifndef __ASM_SH_FTRACE_H
#define __ASM_SH_FTRACE_H

#ifdef CONFIG_FUNCTION_TRACER

#define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
#define FTRACE_SYSCALL_MAX	NR_syscalls

#ifndef __ASSEMBLY__
extern void mcount(void);

#define MCOUNT_ADDR		((long)(mcount))

#ifdef CONFIG_DYNAMIC_FTRACE
#define CALL_ADDR		((long)(ftrace_call))
#define STUB_ADDR		((long)(ftrace_stub))
#define GRAPH_ADDR		((long)(ftrace_graph_call))
#define CALLER_ADDR		((long)(ftrace_caller))

#define MCOUNT_INSN_OFFSET	((STUB_ADDR - CALL_ADDR) - 4)
#define GRAPH_INSN_OFFSET	((CALLER_ADDR - GRAPH_ADDR) - 4)

struct dyn_arch_ftrace {
	/* No extra data needed on sh */
};

#endif /* CONFIG_DYNAMIC_FTRACE */

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
	/* 'addr' is the memory table address. */
	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 */

#endif /* __ASM_SH_FTRACE_H */