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__
19extern atomic_t modifying_ftrace_code;
20extern void __fentry__(void);
21
22static 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 */
38static 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_DYNAMIC_FTRACE
45
46struct dyn_arch_ftrace {
47	/* No extra data needed for x86 */
48};
49
50#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
51
52#endif /*  CONFIG_DYNAMIC_FTRACE */
53#endif /* __ASSEMBLY__ */
54#endif /* CONFIG_FUNCTION_TRACER */
55
56
57#ifndef __ASSEMBLY__
58
59#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
60extern void set_ftrace_ops_ro(void);
61#else
62static inline void set_ftrace_ops_ro(void) { }
63#endif
64
65#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
66static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
67{
68	/*
69	 * Compare the symbol name with the system call name. Skip the
70	 * "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix.
71	 */
72	return !strcmp(sym + 3, name + 3) ||
73		(!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
74		(!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) ||
75		(!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3));
76}
77
78#ifndef COMPILE_OFFSETS
79
80#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
81#include <linux/compat.h>
82
83/*
84 * Because ia32 syscalls do not map to x86_64 syscall numbers
85 * this screws up the trace output when tracing a ia32 task.
86 * Instead of reporting bogus syscalls, just do not trace them.
87 *
88 * If the user really wants these, then they should use the
89 * raw syscall tracepoints with filtering.
90 */
91#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
92static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
93{
94	return in_32bit_syscall();
95}
96#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
97#endif /* !COMPILE_OFFSETS */
98#endif /* !__ASSEMBLY__ */
99
100#endif /* _ASM_X86_FTRACE_H */
101