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 /* Ignore unused weak functions which will have larger offsets */
12 #if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)
13 #define FTRACE_MCOUNT_MAX_OFFSET 16
14 #elif defined(CONFIG_PPC32)
15 #define FTRACE_MCOUNT_MAX_OFFSET 8
16 #endif
17
18 #ifndef __ASSEMBLY__
19 extern void _mcount(void);
20
21 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
22 unsigned long sp);
23
24 struct module;
25 struct dyn_ftrace;
26 struct dyn_arch_ftrace {
27 struct module *mod;
28 };
29
30 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
31 #define ftrace_need_init_nop() (true)
32 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
33 #define ftrace_init_nop ftrace_init_nop
34
35 struct ftrace_regs {
36 struct pt_regs regs;
37 };
38
39 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
40 {
41 /* We clear regs.msr in ftrace_call */
42 return fregs->regs.msr ? &fregs->regs : NULL;
43 }
44
45 static __always_inline void
46 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
47 unsigned long ip)
48 {
49 regs_set_return_ip(&fregs->regs, ip);
50 }
51
52 static __always_inline unsigned long
53 ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs)
54 {
55 return instruction_pointer(&fregs->regs);
56 }
57
58 #define ftrace_regs_get_argument(fregs, n) \
59 regs_get_kernel_argument(&(fregs)->regs, n)
60 #define ftrace_regs_get_stack_pointer(fregs) \
61 kernel_stack_pointer(&(fregs)->regs)
62 #define ftrace_regs_return_value(fregs) \
63 regs_return_value(&(fregs)->regs)
64 #define ftrace_regs_set_return_value(fregs, ret) \
65 regs_set_return_value(&(fregs)->regs, ret)
66 #define ftrace_override_function_with_return(fregs) \
67 override_function_with_return(&(fregs)->regs)
68 #define ftrace_regs_query_register_offset(name) \
69 regs_query_register_offset(name)
70
71 struct ftrace_ops;
72
73 #define ftrace_graph_func ftrace_graph_func
74 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
75 struct ftrace_ops *op, struct ftrace_regs *fregs);
76 #endif
77 #endif /* __ASSEMBLY__ */
78
79 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
80 #define ARCH_SUPPORTS_FTRACE_OPS 1
81 #endif
82 #endif /* CONFIG_FUNCTION_TRACER */
83
84 #ifndef __ASSEMBLY__
85 #ifdef CONFIG_FTRACE_SYSCALLS
86 /*
87 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
88 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
89 * those.
90 */
91 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
92 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
93 {
94 return !strcmp(sym, name) ||
95 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
96 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
97 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
98 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
99 }
100 #endif /* CONFIG_FTRACE_SYSCALLS */
101
102 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
103 #include <asm/paca.h>
104
105 static inline void this_cpu_disable_ftrace(void)
106 {
107 get_paca()->ftrace_enabled = 0;
108 }
109
110 static inline void this_cpu_enable_ftrace(void)
111 {
112 get_paca()->ftrace_enabled = 1;
113 }
114
115 /* Disable ftrace on this CPU if possible (may not be implemented) */
116 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
117 {
118 get_paca()->ftrace_enabled = ftrace_enabled;
119 }
120
121 static inline u8 this_cpu_get_ftrace_enabled(void)
122 {
123 return get_paca()->ftrace_enabled;
124 }
125 #else /* CONFIG_PPC64 */
126 static inline void this_cpu_disable_ftrace(void) { }
127 static inline void this_cpu_enable_ftrace(void) { }
128 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
129 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
130 #endif /* CONFIG_PPC64 */
131
132 #ifdef CONFIG_FUNCTION_TRACER
133 extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
134 void ftrace_free_init_tramp(void);
135 unsigned long ftrace_call_adjust(unsigned long addr);
136 #else
137 static inline void ftrace_free_init_tramp(void) { }
138 static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; }
139 #endif
140 #endif /* !__ASSEMBLY__ */
141
142 #endif /* _ASM_POWERPC_FTRACE */
143
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