1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_FTRACE_H 3 #define _ASM_X86_FTRACE_H 4 5 #ifdef CONFIG_FUNCTION_TRACER 6 #ifndef CC_USING_FENTRY 7 # error Compiler does not support fentry? 8 #endif 9 # define MCOUNT_ADDR ((unsigned long)(__fentry__)) 10 #define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */ 11 12 /* Ignore unused weak functions which will have non zero offsets */ 13 #ifdef CONFIG_HAVE_FENTRY 14 # include <asm/ibt.h> 15 /* Add offset for endbr64 if IBT enabled */ 16 # define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE 17 #endif 18 19 #ifdef CONFIG_DYNAMIC_FTRACE 20 #define ARCH_SUPPORTS_FTRACE_OPS 1 21 #endif 22 23 #define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR 24 25 #ifndef __ASSEMBLY__ 26 extern atomic_t modifying_ftrace_code; 27 extern void __fentry__(void); 28 29 static inline unsigned long ftrace_call_adjust(unsigned long addr) 30 { 31 /* 32 * addr is the address of the mcount call instruction. 33 * recordmcount does the necessary offset calculation. 34 */ 35 return addr; 36 } 37 38 /* 39 * When a ftrace registered caller is tracing a function that is 40 * also set by a register_ftrace_direct() call, it needs to be 41 * differentiated in the ftrace_caller trampoline. To do this, we 42 * place the direct caller in the ORIG_AX part of pt_regs. This 43 * tells the ftrace_caller that there's a direct caller. 44 */ 45 static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr) 46 { 47 /* Emulate a call */ 48 regs->orig_ax = addr; 49 } 50 51 #ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS 52 struct ftrace_regs { 53 struct pt_regs regs; 54 }; 55 56 static __always_inline struct pt_regs * 57 arch_ftrace_get_regs(struct ftrace_regs *fregs) 58 { 59 /* Only when FL_SAVE_REGS is set, cs will be non zero */ 60 if (!fregs->regs.cs) 61 return NULL; 62 return &fregs->regs; 63 } 64 65 #define ftrace_instruction_pointer_set(fregs, _ip) \ 66 do { (fregs)->regs.ip = (_ip); } while (0) 67 68 struct ftrace_ops; 69 #define ftrace_graph_func ftrace_graph_func 70 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, 71 struct ftrace_ops *op, struct ftrace_regs *fregs); 72 #else 73 #define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR 74 #endif 75 76 #ifdef CONFIG_DYNAMIC_FTRACE 77 78 struct dyn_arch_ftrace { 79 /* No extra data needed for x86 */ 80 }; 81 82 #endif /* CONFIG_DYNAMIC_FTRACE */ 83 #endif /* __ASSEMBLY__ */ 84 #endif /* CONFIG_FUNCTION_TRACER */ 85 86 87 #ifndef __ASSEMBLY__ 88 89 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) 90 extern void set_ftrace_ops_ro(void); 91 #else 92 static inline void set_ftrace_ops_ro(void) { } 93 #endif 94 95 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 96 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 97 { 98 /* 99 * Compare the symbol name with the system call name. Skip the 100 * "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix. 101 */ 102 return !strcmp(sym + 3, name + 3) || 103 (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) || 104 (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) || 105 (!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3)); 106 } 107 108 #ifndef COMPILE_OFFSETS 109 110 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION) 111 #include <linux/compat.h> 112 113 /* 114 * Because ia32 syscalls do not map to x86_64 syscall numbers 115 * this screws up the trace output when tracing a ia32 task. 116 * Instead of reporting bogus syscalls, just do not trace them. 117 * 118 * If the user really wants these, then they should use the 119 * raw syscall tracepoints with filtering. 120 */ 121 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1 122 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) 123 { 124 return in_32bit_syscall(); 125 } 126 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */ 127 #endif /* !COMPILE_OFFSETS */ 128 #endif /* !__ASSEMBLY__ */ 129 130 #endif /* _ASM_X86_FTRACE_H */ 131