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 __ASSEMBLY__
19 extern void _mcount(void);
20 #define mcount _mcount
21
22 #define safe_load(load, src, dst, error) \
23 do { \
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) "\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) \
45 do { \
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) "\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
79 static inline unsigned long ftrace_call_adjust(unsigned long addr)
80 {
81 return addr;
82 }
83
84 struct dyn_arch_ftrace {
85 };
86
87 #endif /* CONFIG_DYNAMIC_FTRACE */
88 #endif /* __ASSEMBLY__ */
89 #endif /* CONFIG_FUNCTION_TRACER */
90 #endif /* _ASM_MIPS_FTRACE_H */