1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_FTRACE
3 #define _ASM_POWERPC_FTRACE
7 #ifdef CONFIG_FUNCTION_TRACER
8 #define MCOUNT_ADDR ((unsigned long)(_mcount))
9 #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */
11 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
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
21 extern void _mcount(void);
23 static inline unsigned long ftrace_call_adjust(unsigned long addr)
25 if (IS_ENABLED(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY))
26 addr += MCOUNT_INSN_SIZE;
31 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
36 struct dyn_arch_ftrace {
40 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
41 #define ftrace_need_init_nop() (true)
42 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
43 #define ftrace_init_nop ftrace_init_nop
49 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
51 /* We clear regs.msr in ftrace_call */
52 return fregs->regs.msr ? &fregs->regs : NULL;
55 static __always_inline void
56 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
59 regs_set_return_ip(&fregs->regs, ip);
62 static __always_inline unsigned long
63 ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs)
65 return instruction_pointer(&fregs->regs);
68 #define ftrace_regs_get_argument(fregs, n) \
69 regs_get_kernel_argument(&(fregs)->regs, n)
70 #define ftrace_regs_get_stack_pointer(fregs) \
71 kernel_stack_pointer(&(fregs)->regs)
72 #define ftrace_regs_return_value(fregs) \
73 regs_return_value(&(fregs)->regs)
74 #define ftrace_regs_set_return_value(fregs, ret) \
75 regs_set_return_value(&(fregs)->regs, ret)
76 #define ftrace_override_function_with_return(fregs) \
77 override_function_with_return(&(fregs)->regs)
78 #define ftrace_regs_query_register_offset(name) \
79 regs_query_register_offset(name)
83 #define ftrace_graph_func ftrace_graph_func
84 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
85 struct ftrace_ops *op, struct ftrace_regs *fregs);
87 #endif /* __ASSEMBLY__ */
89 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
90 #define ARCH_SUPPORTS_FTRACE_OPS 1
92 #endif /* CONFIG_FUNCTION_TRACER */
95 #ifdef CONFIG_FTRACE_SYSCALLS
97 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
98 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
101 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
102 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
104 return !strcmp(sym, name) ||
105 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
106 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
107 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
108 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
110 #endif /* CONFIG_FTRACE_SYSCALLS */
112 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
113 #include <asm/paca.h>
115 static inline void this_cpu_disable_ftrace(void)
117 get_paca()->ftrace_enabled = 0;
120 static inline void this_cpu_enable_ftrace(void)
122 get_paca()->ftrace_enabled = 1;
125 /* Disable ftrace on this CPU if possible (may not be implemented) */
126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
128 get_paca()->ftrace_enabled = ftrace_enabled;
131 static inline u8 this_cpu_get_ftrace_enabled(void)
133 return get_paca()->ftrace_enabled;
135 #else /* CONFIG_PPC64 */
136 static inline void this_cpu_disable_ftrace(void) { }
137 static inline void this_cpu_enable_ftrace(void) { }
138 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
139 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
140 #endif /* CONFIG_PPC64 */
142 #ifdef CONFIG_FUNCTION_TRACER
143 extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
144 void ftrace_free_init_tramp(void);
146 static inline void ftrace_free_init_tramp(void) { }
148 #endif /* !__ASSEMBLY__ */
150 #endif /* _ASM_POWERPC_FTRACE */