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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_FTRACE_H
3#define _ASM_X86_FTRACE_H
4
5#include <asm/ptrace.h>
6
7#ifdef CONFIG_FUNCTION_TRACER
8#ifndef CC_USING_FENTRY
9# error Compiler does not support fentry?
10#endif
11# define MCOUNT_ADDR ((unsigned long)(__fentry__))
12#define MCOUNT_INSN_SIZE 5 /* sizeof mcount call */
13
14/* Ignore unused weak functions which will have non zero offsets */
15#ifdef CONFIG_HAVE_FENTRY
16# include <asm/ibt.h>
17/* Add offset for endbr64 if IBT enabled */
18# define FTRACE_MCOUNT_MAX_OFFSET ENDBR_INSN_SIZE
19#endif
20
21#ifdef CONFIG_DYNAMIC_FTRACE
22#define ARCH_SUPPORTS_FTRACE_OPS 1
23#endif
24
25#ifndef __ASSEMBLER__
26extern void __fentry__(void);
27
28static inline unsigned long ftrace_call_adjust(unsigned long addr)
29{
30 /*
31 * addr is the address of the mcount call instruction.
32 * recordmcount does the necessary offset calculation.
33 */
34 return addr;
35}
36
37static inline unsigned long arch_ftrace_get_symaddr(unsigned long fentry_ip)
38{
39 if (is_endbr((void*)(fentry_ip - ENDBR_INSN_SIZE)))
40 fentry_ip -= ENDBR_INSN_SIZE;
41
42 return fentry_ip;
43}
44#define ftrace_get_symaddr(fentry_ip) arch_ftrace_get_symaddr(fentry_ip)
45
46#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
47
48#include <linux/ftrace_regs.h>
49
50static __always_inline struct pt_regs *
51arch_ftrace_get_regs(struct ftrace_regs *fregs)
52{
53 /* Only when FL_SAVE_REGS is set, cs will be non zero */
54 if (!arch_ftrace_regs(fregs)->regs.cs)
55 return NULL;
56 return &arch_ftrace_regs(fregs)->regs;
57}
58
59#define arch_ftrace_fill_perf_regs(fregs, _regs) do { \
60 (_regs)->ip = arch_ftrace_regs(fregs)->regs.ip; \
61 (_regs)->sp = arch_ftrace_regs(fregs)->regs.sp; \
62 (_regs)->cs = __KERNEL_CS; \
63 (_regs)->flags = 0; \
64 } while (0)
65
66#define ftrace_regs_set_instruction_pointer(fregs, _ip) \
67 do { arch_ftrace_regs(fregs)->regs.ip = (_ip); } while (0)
68
69
70static __always_inline unsigned long
71ftrace_regs_get_return_address(struct ftrace_regs *fregs)
72{
73 return *(unsigned long *)ftrace_regs_get_stack_pointer(fregs);
74}
75
76struct ftrace_ops;
77#define ftrace_graph_func ftrace_graph_func
78void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
79 struct ftrace_ops *op, struct ftrace_regs *fregs);
80#else
81#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
82#endif
83
84#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
85/*
86 * When a ftrace registered caller is tracing a function that is
87 * also set by a register_ftrace_direct() call, it needs to be
88 * differentiated in the ftrace_caller trampoline. To do this, we
89 * place the direct caller in the ORIG_AX part of pt_regs. This
90 * tells the ftrace_caller that there's a direct caller.
91 */
92static inline void
93__arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
94{
95 /* Emulate a call */
96 regs->orig_ax = addr;
97}
98#define arch_ftrace_set_direct_caller(fregs, addr) \
99 __arch_ftrace_set_direct_caller(&arch_ftrace_regs(fregs)->regs, addr)
100#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
101
102#ifdef CONFIG_DYNAMIC_FTRACE
103
104struct dyn_arch_ftrace {
105 /* No extra data needed for x86 */
106};
107
108#endif /* CONFIG_DYNAMIC_FTRACE */
109#endif /* __ASSEMBLER__ */
110#endif /* CONFIG_FUNCTION_TRACER */
111
112
113#ifndef __ASSEMBLER__
114
115void prepare_ftrace_return(unsigned long ip, unsigned long *parent,
116 unsigned long frame_pointer);
117
118#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)
119extern void set_ftrace_ops_ro(void);
120#else
121static inline void set_ftrace_ops_ro(void) { }
122#endif
123
124#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
125static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
126{
127 /*
128 * Compare the symbol name with the system call name. Skip the
129 * "__x64_sys", "__ia32_sys", "__do_sys" or simple "sys" prefix.
130 */
131 return !strcmp(sym + 3, name + 3) ||
132 (!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
133 (!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3)) ||
134 (!strncmp(sym, "__do_sys", 8) && !strcmp(sym + 8, name + 3));
135}
136
137#ifndef COMPILE_OFFSETS
138
139#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
140#include <linux/compat.h>
141
142/*
143 * Because ia32 syscalls do not map to x86_64 syscall numbers
144 * this screws up the trace output when tracing a ia32 task.
145 * Instead of reporting bogus syscalls, just do not trace them.
146 *
147 * If the user really wants these, then they should use the
148 * raw syscall tracepoints with filtering.
149 */
150#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS 1
151static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
152{
153 return in_32bit_syscall();
154}
155#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
156#endif /* !COMPILE_OFFSETS */
157#endif /* !__ASSEMBLER__ */
158
159#endif /* _ASM_X86_FTRACE_H */