ftrace.h

Go to the documentation of this file.

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive for
 * more details.
 *
 * Copyright (C) 2009 DSLab, Lanzhou University, China
 * Author: Wu Zhangjin <[email protected]>
 */

#ifndef _ASM_MIPS_FTRACE_H
#define _ASM_MIPS_FTRACE_H

#ifdef CONFIG_FUNCTION_TRACER

#define MCOUNT_ADDR ((unsigned long)(_mcount))
#define MCOUNT_INSN_SIZE 4      /* sizeof mcount call */

#ifndef __ASSEMBLY__
extern void _mcount(void);
#define mcount _mcount

#define safe_load(load, src, dst, error)        \
do {                            \
    asm volatile (                  \
        "1: " load " %[" STR(dst) "], 0(%[" STR(src) "])\n"\
        "   li %[" STR(error) "], 0\n"      \
        "2:\n"                  \
                            \
        ".section .fixup, \"ax\"\n"     \
        "3: li %[" STR(error) "], 1\n"      \
        "   j 2b\n"             \
        ".previous\n"               \
                            \
        ".section\t__ex_table,\"a\"\n\t"    \
        STR(PTR) "\t1b, 3b\n\t"         \
        ".previous\n"               \
                            \
        : [dst] "=&r" (dst), [error] "=r" (error)\
        : [src] "r" (src)           \
        : "memory"              \
    );                      \
} while (0)

#define safe_store(store, src, dst, error)  \
do {                        \
    asm volatile (              \
        "1: " store " %[" STR(src) "], 0(%[" STR(dst) "])\n"\
        "   li %[" STR(error) "], 0\n"  \
        "2:\n"              \
                        \
        ".section .fixup, \"ax\"\n" \
        "3: li %[" STR(error) "], 1\n"  \
        "   j 2b\n"         \
        ".previous\n"           \
                        \
        ".section\t__ex_table,\"a\"\n\t"\
        STR(PTR) "\t1b, 3b\n\t"     \
        ".previous\n"           \
                        \
        : [error] "=r" (error)      \
        : [dst] "r" (dst), [src] "r" (src)\
        : "memory"          \
    );                  \
} while (0)

#define safe_load_code(dst, src, error) \
    safe_load(STR(lw), src, dst, error)
#define safe_store_code(src, dst, error) \
    safe_store(STR(sw), src, dst, error)

#define safe_load_stack(dst, src, error) \
    safe_load(STR(PTR_L), src, dst, error)

#define safe_store_stack(src, dst, error) \
    safe_store(STR(PTR_S), src, dst, error)


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

struct dyn_arch_ftrace {
};

#endif /*  CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */
#endif /* _ASM_MIPS_FTRACE_H */