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 void mcount(void); 20 extern atomic_t modifying_ftrace_code; 21 extern void __fentry__(void); 22 23 static inline unsigned long ftrace_call_adjust(unsigned long addr) 24 { 25 /* 26 * addr is the address of the mcount call instruction. 27 * recordmcount does the necessary offset calculation. 28 */ 29 return addr; 30 } 31 32 #ifdef CONFIG_DYNAMIC_FTRACE 33 34 struct dyn_arch_ftrace { 35 /* No extra data needed for x86 */ 36 }; 37 38 int ftrace_int3_handler(struct pt_regs *regs); 39 40 #define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR 41 42 #endif /* CONFIG_DYNAMIC_FTRACE */ 43 #endif /* __ASSEMBLY__ */ 44 #endif /* CONFIG_FUNCTION_TRACER */ 45 46 47 #ifndef __ASSEMBLY__ 48 49 #define ARCH_HAS_SYSCALL_MATCH_SYM_NAME 50 static inline bool arch_syscall_match_sym_name(const char *sym, const char *name) 51 { 52 /* 53 * Compare the symbol name with the system call name. Skip the 54 * "__x64_sys", "__ia32_sys" or simple "sys" prefix. 55 */ 56 return !strcmp(sym + 3, name + 3) || 57 (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) || 58 (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)); 59 } 60 61 #ifndef COMPILE_OFFSETS 62 63 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION) 64 #include <linux/compat.h> 65 66 /* 67 * Because ia32 syscalls do not map to x86_64 syscall numbers 68 * this screws up the trace output when tracing a ia32 task. 69 * Instead of reporting bogus syscalls, just do not trace them. 70 * 71 * If the user really wants these, then they should use the 72 * raw syscall tracepoints with filtering. 73 */ 74 #define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1 75 static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs) 76 { 77 return in_32bit_syscall(); 78 } 79 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */ 80 #endif /* !COMPILE_OFFSETS */ 81 #endif /* !__ASSEMBLY__ */ 82 83 #endif /* _ASM_X86_FTRACE_H */ 84