include/asm/ftrace.h

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive for
0004  * more details.
0005  *
0006  * Copyright (C) 2009 DSLab, Lanzhou University, China
0007  * Author: Wu Zhangjin <wuzhangjin@gmail.com>
0008  */
0009
0010 #ifndef _ASM_MIPS_FTRACE_H
0011 #define _ASM_MIPS_FTRACE_H
0012
0013 #ifdef CONFIG_FUNCTION_TRACER
0014
0015 #define MCOUNT_ADDR ((unsigned long)(_mcount))
0016 #define MCOUNT_INSN_SIZE 4      /* sizeof mcount call */
0017
0018 #ifndef __ASSEMBLY__
0019 extern void _mcount(void);
0020 #define mcount _mcount
0021
0022 #define safe_load(load, src, dst, error)        \
0023 do {                            \
0024     asm volatile (                  \
0025         "1: " load " %[tmp_dst], 0(%[tmp_src])\n"   \
0026         "   li %[tmp_err], 0\n"         \
0027         "2: .insn\n"                \
0028                             \
0029         ".section .fixup, \"ax\"\n"     \
0030         "3: li %[tmp_err], 1\n"         \
0031         "   j 2b\n"             \
0032         ".previous\n"               \
0033                             \
0034         ".section\t__ex_table,\"a\"\n\t"    \
0035         STR(PTR_WD) "\t1b, 3b\n\t"      \
0036         ".previous\n"               \
0037                             \
0038         : [tmp_dst] "=&r" (dst), [tmp_err] "=r" (error)\
0039         : [tmp_src] "r" (src)           \
0040         : "memory"              \
0041     );                      \
0042 } while (0)
0043
0044 #define safe_store(store, src, dst, error)  \
0045 do {                        \
0046     asm volatile (              \
0047         "1: " store " %[tmp_src], 0(%[tmp_dst])\n"\
0048         "   li %[tmp_err], 0\n"     \
0049         "2: .insn\n"            \
0050                         \
0051         ".section .fixup, \"ax\"\n" \
0052         "3: li %[tmp_err], 1\n"     \
0053         "   j 2b\n"         \
0054         ".previous\n"           \
0055                         \
0056         ".section\t__ex_table,\"a\"\n\t"\
0057         STR(PTR_WD) "\t1b, 3b\n\t"  \
0058         ".previous\n"           \
0059                         \
0060         : [tmp_err] "=r" (error)    \
0061         : [tmp_dst] "r" (dst), [tmp_src] "r" (src)\
0062         : "memory"          \
0063     );                  \
0064 } while (0)
0065
0066 #define safe_load_code(dst, src, error) \
0067     safe_load(STR(lw), src, dst, error)
0068 #define safe_store_code(src, dst, error) \
0069     safe_store(STR(sw), src, dst, error)
0070
0071 #define safe_load_stack(dst, src, error) \
0072     safe_load(STR(PTR_L), src, dst, error)
0073
0074 #define safe_store_stack(src, dst, error) \
0075     safe_store(STR(PTR_S), src, dst, error)
0076
0077
0078 #ifdef CONFIG_DYNAMIC_FTRACE
0079 static inline unsigned long ftrace_call_adjust(unsigned long addr)
0080 {
0081     return addr;
0082 }
0083
0084 struct dyn_arch_ftrace {
0085 };
0086
0087 #endif /*  CONFIG_DYNAMIC_FTRACE */
0088 #endif /* __ASSEMBLY__ */
0089 #endif /* CONFIG_FUNCTION_TRACER */
0090 #endif /* _ASM_MIPS_FTRACE_H */