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
145
146
147
148
149
150
151
152
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FTRACE_H
#define _ASM_S390_FTRACE_H
#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR
#define ARCH_SUPPORTS_FTRACE_OPS 1
#define MCOUNT_INSN_SIZE 6
#ifndef __ASSEMBLY__
#ifdef CONFIG_CC_IS_CLANG
/* https://bugs.llvm.org/show_bug.cgi?id=41424 */
#define ftrace_return_address(n) 0UL
#else
#define ftrace_return_address(n) __builtin_return_address(n)
#endif
void ftrace_caller(void);
extern void *ftrace_func;
struct dyn_arch_ftrace { };
#define MCOUNT_ADDR 0
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
#define KPROBE_ON_FTRACE_NOP 0
#define KPROBE_ON_FTRACE_CALL 1
struct module;
struct dyn_ftrace;
bool ftrace_need_init_nop(void);
#define ftrace_need_init_nop ftrace_need_init_nop
int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec);
#define ftrace_init_nop ftrace_init_nop
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
struct ftrace_regs {
struct pt_regs regs;
};
static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_regs *fregs)
{
struct pt_regs *regs = &fregs->regs;
if (test_pt_regs_flag(regs, PIF_FTRACE_FULL_REGS))
return regs;
return NULL;
}
static __always_inline unsigned long
ftrace_regs_get_instruction_pointer(const struct ftrace_regs *fregs)
{
return fregs->regs.psw.addr;
}
static __always_inline void
ftrace_regs_set_instruction_pointer(struct ftrace_regs *fregs,
unsigned long ip)
{
fregs->regs.psw.addr = ip;
}
#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)
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
/*
* When an ftrace registered caller is tracing a function that is
* also set by a register_ftrace_direct() call, it needs to be
* differentiated in the ftrace_caller trampoline. To do this,
* place the direct caller in the ORIG_GPR2 part of pt_regs. This
* tells the ftrace_caller that there's a direct caller.
*/
static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
{
struct pt_regs *regs = &fregs->regs;
regs->orig_gpr2 = addr;
}
#endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */
/*
* Even though the system call numbers are identical for s390/s390x a
* different system call table is used for compat tasks. This may lead
* to e.g. incorrect or missing trace event sysfs files.
* Therefore simply do not trace compat system calls at all.
* See kernel/trace/trace_syscalls.c.
*/
#define ARCH_TRACE_IGNORE_COMPAT_SYSCALLS
static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
{
return is_compat_task();
}
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym,
const char *name)
{
/*
* Skip __s390_ and __s390x_ prefix - due to compat wrappers
* and aliasing some symbols of 64 bit system call functions
* may get the __s390_ prefix instead of the __s390x_ prefix.
*/
return !strcmp(sym + 7, name) || !strcmp(sym + 8, name);
}
#endif /* __ASSEMBLY__ */
#ifdef CONFIG_FUNCTION_TRACER
#define FTRACE_NOP_INSN .word 0xc004, 0x0000, 0x0000 /* brcl 0,0 */
#ifndef CC_USING_HOTPATCH
#define FTRACE_GEN_MCOUNT_RECORD(name) \
.section __mcount_loc, "a", @progbits; \
.quad name; \
.previous;
#else /* !CC_USING_HOTPATCH */
#define FTRACE_GEN_MCOUNT_RECORD(name)
#endif /* !CC_USING_HOTPATCH */
#define FTRACE_GEN_NOP_ASM(name) \
FTRACE_GEN_MCOUNT_RECORD(name) \
FTRACE_NOP_INSN
#else /* CONFIG_FUNCTION_TRACER */
#define FTRACE_GEN_NOP_ASM(name)
#endif /* CONFIG_FUNCTION_TRACER */
#endif /* _ASM_S390_FTRACE_H */
|
