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