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 /* Ignore unused weak functions which will have larger offsets */ 12 #if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY) 13 #define FTRACE_MCOUNT_MAX_OFFSET 16 14 #elif defined(CONFIG_PPC32) 15 #define FTRACE_MCOUNT_MAX_OFFSET 8 16 #endif 17 18 #ifndef __ASSEMBLY__ 19 extern void _mcount(void); 20 21 unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip, 22 unsigned long sp); 23 24 struct module; 25 struct dyn_ftrace; 26 struct dyn_arch_ftrace { 27 #ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE 28 /* pointer to the associated out-of-line stub */ 29 unsigned long ool_stub; 30 #endif 31 }; 32 33 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS 34 #define ftrace_need_init_nop() (true) 35 int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); 36 #define ftrace_init_nop ftrace_init_nop 37 38 #include <linux/ftrace_regs.h> 39 40 static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs) 41 { 42 /* We clear regs.msr in ftrace_call */ 43 return arch_ftrace_regs(fregs)->regs.msr ? &arch_ftrace_regs(fregs)->regs : NULL; 44 } 45 46 static __always_inline void 47 ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, 48 unsigned long ip) 49 { 50 regs_set_return_ip(&arch_ftrace_regs(fregs)->regs, ip); 51 } 52 53 struct ftrace_ops; 54 55 #define ftrace_graph_func ftrace_graph_func 56 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, 57 struct ftrace_ops *op, struct ftrace_regs *fregs); 58 #endif 59 #endif /* __ASSEMBLY__ */ 60 61 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS 62 #define ARCH_SUPPORTS_FTRACE_OPS 1 63 #endif 64 #endif /* CONFIG_FUNCTION_TRACER */ 65 66 #ifndef __ASSEMBLY__ 67 #ifdef CONFIG_FTRACE_SYSCALLS 68 /* 69 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone, 70 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with 71 * those. 72 */ 73 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 74 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 75 { 76 return !strcmp(sym, name) || 77 (!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) || 78 (!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) || 79 (!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) || 80 (!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4)); 81 } 82 #endif /* CONFIG_FTRACE_SYSCALLS */ 83 84 #if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER) 85 #include <asm/paca.h> 86 87 static inline void this_cpu_disable_ftrace(void) 88 { 89 get_paca()->ftrace_enabled = 0; 90 } 91 92 static inline void this_cpu_enable_ftrace(void) 93 { 94 get_paca()->ftrace_enabled = 1; 95 } 96 97 /* Disable ftrace on this CPU if possible (may not be implemented) */ 98 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) 99 { 100 get_paca()->ftrace_enabled = ftrace_enabled; 101 } 102 103 static inline u8 this_cpu_get_ftrace_enabled(void) 104 { 105 return get_paca()->ftrace_enabled; 106 } 107 #else /* CONFIG_PPC64 */ 108 static inline void this_cpu_disable_ftrace(void) { } 109 static inline void this_cpu_enable_ftrace(void) { } 110 static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { } 111 static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; } 112 #endif /* CONFIG_PPC64 */ 113 114 #ifdef CONFIG_FUNCTION_TRACER 115 extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[]; 116 #ifdef CONFIG_PPC_FTRACE_OUT_OF_LINE 117 struct ftrace_ool_stub { 118 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS 119 struct ftrace_ops *ftrace_op; 120 #endif 121 u32 insn[4]; 122 } __aligned(sizeof(unsigned long)); 123 extern struct ftrace_ool_stub ftrace_ool_stub_text_end[], ftrace_ool_stub_text[], 124 ftrace_ool_stub_inittext[]; 125 extern unsigned int ftrace_ool_stub_text_end_count, ftrace_ool_stub_text_count, 126 ftrace_ool_stub_inittext_count; 127 #endif 128 void ftrace_free_init_tramp(void); 129 unsigned long ftrace_call_adjust(unsigned long addr); 130 131 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 132 /* 133 * When an ftrace registered caller is tracing a function that is also set by a 134 * register_ftrace_direct() call, it needs to be differentiated in the 135 * ftrace_caller trampoline so that the direct call can be invoked after the 136 * other ftrace ops. To do this, place the direct caller in the orig_gpr3 field 137 * of pt_regs. This tells ftrace_caller that there's a direct caller. 138 */ 139 static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr) 140 { 141 struct pt_regs *regs = &arch_ftrace_regs(fregs)->regs; 142 143 regs->orig_gpr3 = addr; 144 } 145 #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ 146 #else 147 static inline void ftrace_free_init_tramp(void) { } 148 static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; } 149 #endif 150 #endif /* !__ASSEMBLY__ */ 151 152 #endif /* _ASM_POWERPC_FTRACE */ 153