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