blob: 8ea270fdc7fb2d9ffabe5df27d362b9520056553 (
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
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_FTRACE_H
#define _ASM_S390_FTRACE_H
#define ARCH_SUPPORTS_FTRACE_OPS 1
#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
#define MCOUNT_INSN_SIZE 6
#else
#define MCOUNT_INSN_SIZE 24
#define MCOUNT_RETURN_FIXUP 18
#endif
#ifndef __ASSEMBLY__
#define ftrace_return_address(n) __builtin_return_address(n)
void _mcount(void);
void ftrace_caller(void);
extern char ftrace_graph_caller_end;
extern unsigned long ftrace_plt;
struct dyn_arch_ftrace { };
#define MCOUNT_ADDR ((unsigned long)_mcount)
#define FTRACE_ADDR ((unsigned long)ftrace_caller)
#define KPROBE_ON_FTRACE_NOP 0
#define KPROBE_ON_FTRACE_CALL 1
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
return addr;
}
struct ftrace_insn {
u16 opc;
s32 disp;
} __packed;
static inline void ftrace_generate_nop_insn(struct ftrace_insn *insn)
{
#ifdef CONFIG_FUNCTION_TRACER
#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
/* brcl 0,0 */
insn->opc = 0xc004;
insn->disp = 0;
#else
/* jg .+24 */
insn->opc = 0xc0f4;
insn->disp = MCOUNT_INSN_SIZE / 2;
#endif
#endif
}
static inline int is_ftrace_nop(struct ftrace_insn *insn)
{
#ifdef CONFIG_FUNCTION_TRACER
#if defined(CC_USING_HOTPATCH) || defined(CC_USING_NOP_MCOUNT)
if (insn->disp == 0)
return 1;
#else
if (insn->disp == MCOUNT_INSN_SIZE / 2)
return 1;
#endif
#endif
return 0;
}
static inline void ftrace_generate_call_insn(struct ftrace_insn *insn,
unsigned long ip)
{
#ifdef CONFIG_FUNCTION_TRACER
unsigned long target;
/* brasl r0,ftrace_caller */
target = is_module_addr((void *) ip) ? ftrace_plt : FTRACE_ADDR;
insn->opc = 0xc005;
insn->disp = (target - ip) / 2;
#endif
}
#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_FTRACE_H */
|
