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 /* Ignore unused weak functions which will have larger offsets */
14 #if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)
15 #define FTRACE_MCOUNT_MAX_OFFSET 16
16 #elif defined(CONFIG_PPC32)
17 #define FTRACE_MCOUNT_MAX_OFFSET 8
18 #endif
19
20 #ifndef __ASSEMBLY__
21 extern void _mcount(void);
22
23 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
24 unsigned long sp);
25
26 struct module;
27 struct dyn_ftrace;
28 struct dyn_arch_ftrace {
29 struct module *mod;
30 };
31
32 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
33 #define ftrace_need_init_nop() (true)
34 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
35 #define ftrace_init_nop ftrace_init_nop
36
37 struct ftrace_regs {
38 struct pt_regs regs;
39 };
40
arch_ftrace_get_regs(struct ftrace_regs * fregs)41 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
42 {
43 /* We clear regs.msr in ftrace_call */
44 return fregs->regs.msr ? &fregs->regs : NULL;
45 }
46
47 static __always_inline void
ftrace_regs_set_instruction_pointer(struct ftrace_regs * fregs,unsigned long ip)48 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
49 unsigned long ip)
50 {
51 regs_set_return_ip(&fregs->regs, ip);
52 }
53
54 static __always_inline unsigned long
ftrace_regs_get_instruction_pointer(struct ftrace_regs * fregs)55 ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs)
56 {
57 return instruction_pointer(&fregs->regs);
58 }
59
60 #define ftrace_regs_get_argument(fregs, n) \
61 regs_get_kernel_argument(&(fregs)->regs, n)
62 #define ftrace_regs_get_stack_pointer(fregs) \
63 kernel_stack_pointer(&(fregs)->regs)
64 #define ftrace_regs_return_value(fregs) \
65 regs_return_value(&(fregs)->regs)
66 #define ftrace_regs_set_return_value(fregs, ret) \
67 regs_set_return_value(&(fregs)->regs, ret)
68 #define ftrace_override_function_with_return(fregs) \
69 override_function_with_return(&(fregs)->regs)
70 #define ftrace_regs_query_register_offset(name) \
71 regs_query_register_offset(name)
72
73 struct ftrace_ops;
74
75 #define ftrace_graph_func ftrace_graph_func
76 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
77 struct ftrace_ops *op, struct ftrace_regs *fregs);
78 #endif
79 #endif /* __ASSEMBLY__ */
80
81 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
82 #define ARCH_SUPPORTS_FTRACE_OPS 1
83 #endif
84 #endif /* CONFIG_FUNCTION_TRACER */
85
86 #ifndef __ASSEMBLY__
87 #ifdef CONFIG_FTRACE_SYSCALLS
88 /*
89 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
90 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
91 * those.
92 */
93 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
arch_syscall_match_sym_name(const char * sym,const char * name)94 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
95 {
96 return !strcmp(sym, name) ||
97 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
98 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
99 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
100 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
101 }
102 #endif /* CONFIG_FTRACE_SYSCALLS */
103
104 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
105 #include <asm/paca.h>
106
this_cpu_disable_ftrace(void)107 static inline void this_cpu_disable_ftrace(void)
108 {
109 get_paca()->ftrace_enabled = 0;
110 }
111
this_cpu_enable_ftrace(void)112 static inline void this_cpu_enable_ftrace(void)
113 {
114 get_paca()->ftrace_enabled = 1;
115 }
116
117 /* Disable ftrace on this CPU if possible (may not be implemented) */
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)118 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
119 {
120 get_paca()->ftrace_enabled = ftrace_enabled;
121 }
122
this_cpu_get_ftrace_enabled(void)123 static inline u8 this_cpu_get_ftrace_enabled(void)
124 {
125 return get_paca()->ftrace_enabled;
126 }
127 #else /* CONFIG_PPC64 */
this_cpu_disable_ftrace(void)128 static inline void this_cpu_disable_ftrace(void) { }
this_cpu_enable_ftrace(void)129 static inline void this_cpu_enable_ftrace(void) { }
this_cpu_set_ftrace_enabled(u8 ftrace_enabled)130 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
this_cpu_get_ftrace_enabled(void)131 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
132 #endif /* CONFIG_PPC64 */
133
134 #ifdef CONFIG_FUNCTION_TRACER
135 extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
136 void ftrace_free_init_tramp(void);
137 unsigned long ftrace_call_adjust(unsigned long addr);
138 #else
ftrace_free_init_tramp(void)139 static inline void ftrace_free_init_tramp(void) { }
ftrace_call_adjust(unsigned long addr)140 static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; }
141 #endif
142 #endif /* !__ASSEMBLY__ */
143
144 #endif /* _ASM_POWERPC_FTRACE */
145