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 #ifndef __ASSEMBLY__ 14 extern void _mcount(void); 15 16 static inline unsigned long ftrace_call_adjust(unsigned long addr) 17 { 18 /* relocation of mcount call site is the same as the address */ 19 return addr; 20 } 21 22 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, 23 unsigned long sp); 24 25 struct dyn_arch_ftrace { 26 struct module *mod; 27 }; 28 29 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS 30 struct ftrace_regs { 31 struct pt_regs regs; 32 }; 33 34 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) 35 { 36 /* We clear regs.msr in ftrace_call */ 37 return fregs->regs.msr ? &fregs->regs : NULL; 38 } 39 40 static __always_inline void 41 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, 42 unsigned long ip) 43 { 44 regs_set_return_ip(&fregs->regs, ip); 45 } 46 47 static __always_inline unsigned long 48 ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs) 49 { 50 return instruction_pointer(&fregs->regs); 51 } 52 53 #define ftrace_regs_get_argument(fregs, n) \ 54 regs_get_kernel_argument(&(fregs)->regs, n) 55 #define ftrace_regs_get_stack_pointer(fregs) \ 56 kernel_stack_pointer(&(fregs)->regs) 57 #define ftrace_regs_return_value(fregs) \ 58 regs_return_value(&(fregs)->regs) 59 #define ftrace_regs_set_return_value(fregs, ret) \ 60 regs_set_return_value(&(fregs)->regs, ret) 61 #define ftrace_override_function_with_return(fregs) \ 62 override_function_with_return(&(fregs)->regs) 63 #define ftrace_regs_query_register_offset(name) \ 64 regs_query_register_offset(name) 65 66 struct ftrace_ops; 67 68 #define ftrace_graph_func ftrace_graph_func 69 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, 70 struct ftrace_ops *op, struct ftrace_regs *fregs); 71 #endif 72 #endif /* __ASSEMBLY__ */ 73 74 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 75 #define ARCH_SUPPORTS_FTRACE_OPS 1 76 #endif 77 #endif /* CONFIG_FUNCTION_TRACER */ 78 79 #ifndef __ASSEMBLY__ 80 #ifdef CONFIG_FTRACE_SYSCALLS 81 /* 82 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone, 83 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with 84 * those. 85 */ 86 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 87 #ifdef CONFIG_PPC64_ELF_ABI_V1 88 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 89 { 90 /* We need to skip past the initial dot, and the __se_sys alias */ 91 return !strcmp(sym + 1, name) || 92 (!strncmp(sym, ".__se_sys", 9) && !strcmp(sym + 6, name)) || 93 (!strncmp(sym, ".ppc_", 5) && !strcmp(sym + 5, name + 4)) || 94 (!strncmp(sym, ".ppc32_", 7) && !strcmp(sym + 7, name + 4)) || 95 (!strncmp(sym, ".ppc64_", 7) && !strcmp(sym + 7, name + 4)); 96 } 97 #else 98 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 99 { 100 return !strcmp(sym, name) || 101 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) || 102 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) || 103 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || 104 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); 105 } 106 #endif /* CONFIG_PPC64_ELF_ABI_V1 */ 107 #endif /* CONFIG_FTRACE_SYSCALLS */ 108 109 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER) 110 #include <asm/paca.h> 111 112 static inline void this_cpu_disable_ftrace(void) 113 { 114 get_paca()->ftrace_enabled = 0; 115 } 116 117 static inline void this_cpu_enable_ftrace(void) 118 { 119 get_paca()->ftrace_enabled = 1; 120 } 121 122 /* Disable ftrace on this CPU if possible (may not be implemented) */ 123 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) 124 { 125 get_paca()->ftrace_enabled = ftrace_enabled; 126 } 127 128 static inline u8 this_cpu_get_ftrace_enabled(void) 129 { 130 return get_paca()->ftrace_enabled; 131 } 132 133 void ftrace_free_init_tramp(void); 134 #else /* CONFIG_PPC64 */ 135 static inline void this_cpu_disable_ftrace(void) { } 136 static inline void this_cpu_enable_ftrace(void) { } 137 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { } 138 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; } 139 static inline void ftrace_free_init_tramp(void) { } 140 #endif /* CONFIG_PPC64 */ 141 #endif /* !__ASSEMBLY__ */ 142 143 #endif /* _ASM_POWERPC_FTRACE */ 144