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 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 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 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 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> 106 107 static inline void this_cpu_disable_ftrace(void) 108 { 109 get_paca()->ftrace_enabled = 0; 110 } 111 112 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) */ 118 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) 119 { 120 get_paca()->ftrace_enabled = ftrace_enabled; 121 } 122 123 static inline u8 this_cpu_get_ftrace_enabled(void) 124 { 125 return get_paca()->ftrace_enabled; 126 } 127 #else /* CONFIG_PPC64 */ 128 static inline void this_cpu_disable_ftrace(void) { } 129 static inline void this_cpu_enable_ftrace(void) { } 130 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { } 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 139 static inline void ftrace_free_init_tramp(void) { } 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