ftrace.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2022 Loongson Technology Corporation Limited
 4 */
 5
 6#ifndef _ASM_LOONGARCH_FTRACE_H
 7#define _ASM_LOONGARCH_FTRACE_H
 8
 9#define FTRACE_PLT_IDX		0
10#define FTRACE_REGS_PLT_IDX	1
11#define NR_FTRACE_PLTS		2
12
13#ifdef CONFIG_FUNCTION_TRACER
14
15#define MCOUNT_INSN_SIZE 4		/* sizeof mcount call */
16
17#ifndef __ASSEMBLER__
18
19#ifndef CONFIG_DYNAMIC_FTRACE
20
21#define mcount _mcount
22extern void _mcount(void);
23extern void prepare_ftrace_return(unsigned long self_addr, unsigned long callsite_sp, unsigned long old);
24
25#else
26
27struct dyn_ftrace;
28struct dyn_arch_ftrace { };
29
30#define ARCH_SUPPORTS_FTRACE_OPS 1
31
32#define ftrace_init_nop ftrace_init_nop
33int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
34
35static inline unsigned long ftrace_call_adjust(unsigned long addr)
36{
37	return addr;
38}
39
40void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent);
41
42#endif /* CONFIG_DYNAMIC_FTRACE */
43
44#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
45struct ftrace_ops;
46
47#include <linux/ftrace_regs.h>
48
49static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
50{
51	return &arch_ftrace_regs(fregs)->regs;
52}
53
54static __always_inline void
55ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs, unsigned long ip)
56{
57	instruction_pointer_set(&arch_ftrace_regs(fregs)->regs, ip);
58}
59
60#undef ftrace_regs_get_frame_pointer
61#define ftrace_regs_get_frame_pointer(fregs) \
62	(arch_ftrace_regs(fregs)->regs.regs[22])
63
64static __always_inline unsigned long
65ftrace_regs_get_return_address(struct ftrace_regs *fregs)
66{
67	return *(unsigned long *)(arch_ftrace_regs(fregs)->regs.regs[1]);
68}
69
70#define ftrace_graph_func ftrace_graph_func
71void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
72		       struct ftrace_ops *op, struct ftrace_regs *fregs);
73
74#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
75static inline void
76__arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr)
77{
78	regs->regs[13] = addr;	/* t1 */
79}
80
81#define arch_ftrace_set_direct_caller(fregs, addr) \
82	__arch_ftrace_set_direct_caller(&arch_ftrace_regs(fregs)->regs, addr)
83#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
84
85#endif
86
87#endif /* __ASSEMBLER__ */
88
89#endif /* CONFIG_FUNCTION_TRACER */
90
91#endif /* _ASM_LOONGARCH_FTRACE_H */