ftrace.h

  1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive for
  4 * more details.
  5 *
  6 * Copyright (C) 2009 DSLab, Lanzhou University, China
  7 * Author: Wu Zhangjin <wuzhangjin@gmail.com>
  8 */
  9
 10#ifndef _ASM_MIPS_FTRACE_H
 11#define _ASM_MIPS_FTRACE_H
 12
 13#ifdef CONFIG_FUNCTION_TRACER
 14
 15#define MCOUNT_ADDR ((unsigned long)(_mcount))
 16#define MCOUNT_INSN_SIZE 4		/* sizeof mcount call */
 17
 18#ifndef __ASSEMBLER__
 19extern void _mcount(void);
 20#define mcount _mcount
 21
 22#define safe_load(load, src, dst, error)		\
 23do {							\
 24	asm volatile (					\
 25		"1: " load " %[tmp_dst], 0(%[tmp_src])\n"	\
 26		"   li %[tmp_err], 0\n"			\
 27		"2: .insn\n"				\
 28							\
 29		".section .fixup, \"ax\"\n"		\
 30		"3: li %[tmp_err], 1\n"			\
 31		"   j 2b\n"				\
 32		".previous\n"				\
 33							\
 34		".section\t__ex_table,\"a\"\n\t"	\
 35		STR(PTR_WD) "\t1b, 3b\n\t"		\
 36		".previous\n"				\
 37							\
 38		: [tmp_dst] "=&r" (dst), [tmp_err] "=r" (error)\
 39		: [tmp_src] "r" (src)			\
 40		: "memory"				\
 41	);						\
 42} while (0)
 43
 44#define safe_store(store, src, dst, error)	\
 45do {						\
 46	asm volatile (				\
 47		"1: " store " %[tmp_src], 0(%[tmp_dst])\n"\
 48		"   li %[tmp_err], 0\n"		\
 49		"2: .insn\n"			\
 50						\
 51		".section .fixup, \"ax\"\n"	\
 52		"3: li %[tmp_err], 1\n"		\
 53		"   j 2b\n"			\
 54		".previous\n"			\
 55						\
 56		".section\t__ex_table,\"a\"\n\t"\
 57		STR(PTR_WD) "\t1b, 3b\n\t"	\
 58		".previous\n"			\
 59						\
 60		: [tmp_err] "=r" (error)	\
 61		: [tmp_dst] "r" (dst), [tmp_src] "r" (src)\
 62		: "memory"			\
 63	);					\
 64} while (0)
 65
 66#define safe_load_code(dst, src, error) \
 67	safe_load(STR(lw), src, dst, error)
 68#define safe_store_code(src, dst, error) \
 69	safe_store(STR(sw), src, dst, error)
 70
 71#define safe_load_stack(dst, src, error) \
 72	safe_load(STR(PTR_L), src, dst, error)
 73
 74#define safe_store_stack(src, dst, error) \
 75	safe_store(STR(PTR_S), src, dst, error)
 76
 77
 78#ifdef CONFIG_DYNAMIC_FTRACE
 79static inline unsigned long ftrace_call_adjust(unsigned long addr)
 80{
 81	return addr;
 82}
 83
 84struct dyn_arch_ftrace {
 85};
 86
 87#endif /*  CONFIG_DYNAMIC_FTRACE */
 88
 89void prepare_ftrace_return(unsigned long *parent_ra_addr, unsigned long self_ra,
 90			   unsigned long fp);
 91
 92#endif /* __ASSEMBLER__ */
 93#endif /* CONFIG_FUNCTION_TRACER */
 94
 95#ifdef CONFIG_FTRACE_SYSCALLS
 96#ifndef __ASSEMBLER__
 97/*
 98 * Some syscall entry functions on mips start with "__sys_" (fork and clone,
 99 * for instance). We should also match the sys_ variant with those.
100 */
101#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
102static inline bool arch_syscall_match_sym_name(const char *sym,
103					       const char *name)
104{
105	return !strcmp(sym, name) ||
106		(!strncmp(sym, "__sys_", 6) && !strcmp(sym + 6, name + 4));
107}
108#endif /* __ASSEMBLER__ */
109#endif /* CONFIG_FTRACE_SYSCALLS */
110#endif /* _ASM_MIPS_FTRACE_H */