summaryrefslogtreecommitdiff
path: root/arch/powerpc/include/asm/ftrace.h
blob: 107fc5a484569673af80bd58e2e5980ae4082fab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_FTRACE
#define _ASM_POWERPC_FTRACE

#include <asm/types.h>

#ifdef CONFIG_FUNCTION_TRACER
#define MCOUNT_ADDR		((unsigned long)(_mcount))
#define MCOUNT_INSN_SIZE	4 /* sizeof mcount call */

#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR

/* Ignore unused weak functions which will have larger offsets */
#if defined(CONFIG_MPROFILE_KERNEL) || defined(CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY)
#define FTRACE_MCOUNT_MAX_OFFSET	16
#elif defined(CONFIG_PPC32)
#define FTRACE_MCOUNT_MAX_OFFSET	8
#endif

#ifndef __ASSEMBLY__
extern void _mcount(void);

unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip,
				    unsigned long sp);

struct module;
struct dyn_ftrace;
struct dyn_arch_ftrace {
	struct module *mod;
};

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
#define ftrace_need_init_nop()	(true)
int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
#define ftrace_init_nop ftrace_init_nop

struct ftrace_regs {
	struct pt_regs regs;
};

static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
{
	/* We clear regs.msr in ftrace_call */
	return fregs->regs.msr ? &fregs->regs : NULL;
}

static __always_inline void
ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
				    unsigned long ip)
{
	regs_set_return_ip(&fregs->regs, ip);
}

static __always_inline unsigned long
ftrace_regs_get_instruction_pointer(struct ftrace_regs *fregs)
{
	return instruction_pointer(&fregs->regs);
}

#define ftrace_regs_get_argument(fregs, n) \
	regs_get_kernel_argument(&(fregs)->regs, n)
#define ftrace_regs_get_stack_pointer(fregs) \
	kernel_stack_pointer(&(fregs)->regs)
#define ftrace_regs_return_value(fregs) \
	regs_return_value(&(fregs)->regs)
#define ftrace_regs_set_return_value(fregs, ret) \
	regs_set_return_value(&(fregs)->regs, ret)
#define ftrace_override_function_with_return(fregs) \
	override_function_with_return(&(fregs)->regs)
#define ftrace_regs_query_register_offset(name) \
	regs_query_register_offset(name)

struct ftrace_ops;

#define ftrace_graph_func ftrace_graph_func
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
		       struct ftrace_ops *op, struct ftrace_regs *fregs);
#endif
#endif /* __ASSEMBLY__ */

#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
#define ARCH_SUPPORTS_FTRACE_OPS 1
#endif
#endif /* CONFIG_FUNCTION_TRACER */

#ifndef __ASSEMBLY__
#ifdef CONFIG_FTRACE_SYSCALLS
/*
 * Some syscall entry functions on powerpc start with "ppc_" (fork and clone,
 * for instance) or ppc32_/ppc64_. We should also match the sys_ variant with
 * those.
 */
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
	return !strcmp(sym, name) ||
		(!strncmp(sym, "__se_sys", 8) && !strcmp(sym + 5, name)) ||
		(!strncmp(sym, "ppc_", 4) && !strcmp(sym + 4, name + 4)) ||
		(!strncmp(sym, "ppc32_", 6) && !strcmp(sym + 6, name + 4)) ||
		(!strncmp(sym, "ppc64_", 6) && !strcmp(sym + 6, name + 4));
}
#endif /* CONFIG_FTRACE_SYSCALLS */

#if defined(CONFIG_PPC64) && defined(CONFIG_FUNCTION_TRACER)
#include <asm/paca.h>

static inline void this_cpu_disable_ftrace(void)
{
	get_paca()->ftrace_enabled = 0;
}

static inline void this_cpu_enable_ftrace(void)
{
	get_paca()->ftrace_enabled = 1;
}

/* Disable ftrace on this CPU if possible (may not be implemented) */
static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled)
{
	get_paca()->ftrace_enabled = ftrace_enabled;
}

static inline u8 this_cpu_get_ftrace_enabled(void)
{
	return get_paca()->ftrace_enabled;
}
#else /* CONFIG_PPC64 */
static inline void this_cpu_disable_ftrace(void) { }
static inline void this_cpu_enable_ftrace(void) { }
static inline void this_cpu_set_ftrace_enabled(u8 ftrace_enabled) { }
static inline u8 this_cpu_get_ftrace_enabled(void) { return 1; }
#endif /* CONFIG_PPC64 */

#ifdef CONFIG_FUNCTION_TRACER
extern unsigned int ftrace_tramp_text[], ftrace_tramp_init[];
void ftrace_free_init_tramp(void);
unsigned long ftrace_call_adjust(unsigned long addr);
#else
static inline void ftrace_free_init_tramp(void) { }
static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; }
#endif
#endif /* !__ASSEMBLY__ */

#endif /* _ASM_POWERPC_FTRACE */