xref: /openbmc/linux/arch/powerpc/include/asm/ftrace.h (revision 31e67366)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_FTRACE
3 #define _ASM_POWERPC_FTRACE
4 
5 #include <asm/types.h>
6 
7 #ifdef CONFIG_FUNCTION_TRACER
8 #define MCOUNT_ADDR		((unsigned long)(_mcount))
9 #define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */
10 
11 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
12 
13 #ifdef __ASSEMBLY__
14 
15 /* Based off of objdump optput from glibc */
16 
17 #define MCOUNT_SAVE_FRAME			\
18 	stwu	r1,-48(r1);			\
19 	stw	r3, 12(r1);			\
20 	stw	r4, 16(r1);			\
21 	stw	r5, 20(r1);			\
22 	stw	r6, 24(r1);			\
23 	mflr	r3;				\
24 	lwz	r4, 52(r1);			\
25 	mfcr	r5;				\
26 	stw	r7, 28(r1);			\
27 	stw	r8, 32(r1);			\
28 	stw	r9, 36(r1);			\
29 	stw	r10,40(r1);			\
30 	stw	r3, 44(r1);			\
31 	stw	r5, 8(r1)
32 
33 #define MCOUNT_RESTORE_FRAME			\
34 	lwz	r6, 8(r1);			\
35 	lwz	r0, 44(r1);			\
36 	lwz	r3, 12(r1);			\
37 	mtctr	r0;				\
38 	lwz	r4, 16(r1);			\
39 	mtcr	r6;				\
40 	lwz	r5, 20(r1);			\
41 	lwz	r6, 24(r1);			\
42 	lwz	r0, 52(r1);			\
43 	lwz	r7, 28(r1);			\
44 	lwz	r8, 32(r1);			\
45 	mtlr	r0;				\
46 	lwz	r9, 36(r1);			\
47 	lwz	r10,40(r1);			\
48 	addi	r1, r1, 48
49 
50 #else /* !__ASSEMBLY__ */
51 extern void _mcount(void);
52 
53 static inline unsigned long ftrace_call_adjust(unsigned long addr)
54 {
55        /* reloction of mcount call site is the same as the address */
56        return addr;
57 }
58 
59 struct dyn_arch_ftrace {
60 	struct module *mod;
61 };
62 #endif /* __ASSEMBLY__ */
63 
64 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
65 #define ARCH_SUPPORTS_FTRACE_OPS 1
66 #endif
67 #endif /* CONFIG_FUNCTION_TRACER */
68 
69 #ifndef __ASSEMBLY__
70 #ifdef CONFIG_FTRACE_SYSCALLS
71 /*
72  * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
73  * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
74  * those.
75  */
76 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
77 #ifdef PPC64_ELF_ABI_v1
78 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
79 {
80 	/* We need to skip past the initial dot, and the __se_sys alias */
81 	return !strcmp(sym + 1, name) ||
82 		(!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) ||
83 		(!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) ||
84 		(!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) ||
85 		(!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4));
86 }
87 #else
88 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
89 {
90 	return !strcmp(sym, name) ||
91 		(!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
92 		(!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
93 		(!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
94 		(!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
95 }
96 #endif /* PPC64_ELF_ABI_v1 */
97 #endif /* CONFIG_FTRACE_SYSCALLS */
98 
99 #ifdef CONFIG_PPC64
100 #include <asm/paca.h>
101 
102 static inline void this_cpu_disable_ftrace(void)
103 {
104 	get_paca()->ftrace_enabled = 0;
105 }
106 
107 static inline void this_cpu_enable_ftrace(void)
108 {
109 	get_paca()->ftrace_enabled = 1;
110 }
111 
112 /* Disable ftrace on this CPU if possible (may not be implemented) */
113 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
114 {
115 	get_paca()->ftrace_enabled = ftrace_enabled;
116 }
117 
118 static inline u8 this_cpu_get_ftrace_enabled(void)
119 {
120 	return get_paca()->ftrace_enabled;
121 }
122 
123 #else /* CONFIG_PPC64 */
124 static inline void this_cpu_disable_ftrace(void) { }
125 static inline void this_cpu_enable_ftrace(void) { }
126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
127 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
128 #endif /* CONFIG_PPC64 */
129 #endif /* !__ASSEMBLY__ */
130 
131 #endif /* _ASM_POWERPC_FTRACE */
132