ftrace.h

Go to the documentation of this file.

/*
 * 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_DYNAMIC_FTRACE

extern void _mcount(void);
#define MCOUNT_ADDR ((unsigned long)_mcount)

static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
    return addr;
}

struct dyn_arch_ftrace {
    /* No extra data needed for Blackfin */
};

#endif

#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