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 static inline unsigned long ftrace_call_adjust(unsigned long addr) 24 { 25 if (IS_ENABLED(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)) 26 addr += MCOUNT_INSN_SIZE; 27 28 return addr; 29 } 30 31 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, 32 unsigned long sp); 33 34 struct module; 35 struct dyn_ftrace; 36 struct dyn_arch_ftrace { 37 struct module *mod; 38 }; 39 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 44 45 struct ftrace_regs { 46 struct pt_regs regs; 47 }; 48 49 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) 50 { 51 /* We clear regs.msr in ftrace_call */ 52 return fregs->regs.msr ? &fregs->regs : NULL; 53 } 54 55 static __always_inline void 56 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, 57 unsigned long ip) 58 { 59 regs_set_return_ip(&fregs->regs, ip); 60 } 61 62 static __always_inline unsigned long 63 ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs) 64 { 65 return instruction_pointer(&fregs->regs); 66 } 67 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) 80 81 struct ftrace_ops; 82 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); 86 #endif 87 #endif /* __ASSEMBLY__ */ 88 89 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 90 #define ARCH_SUPPORTS_FTRACE_OPS 1 91 #endif 92 #endif /* CONFIG_FUNCTION_TRACER */ 93 94 #ifndef __ASSEMBLY__ 95 #ifdef CONFIG_FTRACE_SYSCALLS 96 /* 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 99 * those. 100 */ 101 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 102 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 103 { 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)); 109 } 110 #endif /* CONFIG_FTRACE_SYSCALLS */ 111 112 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER) 113 #include <asm/paca.h> 114 115 static inline void this_cpu_disable_ftrace(void) 116 { 117 get_paca()->ftrace_enabled = 0; 118 } 119 120 static inline void this_cpu_enable_ftrace(void) 121 { 122 get_paca()->ftrace_enabled = 1; 123 } 124 125 /* Disable ftrace on this CPU if possible (may not be implemented) */ 126 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) 127 { 128 get_paca()->ftrace_enabled = ftrace_enabled; 129 } 130 131 static inline u8 this_cpu_get_ftrace_enabled(void) 132 { 133 return get_paca()->ftrace_enabled; 134 } 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 */ 141 142 #ifdef CONFIG_FUNCTION_TRACER 143 extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[]; 144 void ftrace_free_init_tramp(void); 145 #else 146 static inline void ftrace_free_init_tramp(void) { } 147 #endif 148 #endif /* !__ASSEMBLY__ */ 149 150 #endif /* _ASM_POWERPC_FTRACE */ 151