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
153
154
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
#include "../bpf_testmod/bpf_testmod.h"
#include "../bpf_testmod/bpf_testmod_kfunc.h"
char _license[] SEC("license") = "GPL";
void __kfunc_btf_root(void)
{
bpf_kfunc_st_ops_inc10(NULL);
}
static __noinline __used int subprog(struct st_ops_args *args)
{
args->a += 1;
return args->a;
}
__success
/* prologue */
__xlated("0: r6 = *(u64 *)(r1 +0)")
__xlated("1: r7 = *(u64 *)(r6 +0)")
__xlated("2: r7 += 1000")
__xlated("3: *(u64 *)(r6 +0) = r7")
/* main prog */
__xlated("4: r1 = *(u64 *)(r1 +0)")
__xlated("5: r6 = r1")
__xlated("6: call kernel-function")
__xlated("7: r1 = r6")
__xlated("8: call pc+1")
__xlated("9: exit")
SEC("struct_ops/test_prologue")
__naked int test_prologue(void)
{
asm volatile (
"r1 = *(u64 *)(r1 +0);"
"r6 = r1;"
"call %[bpf_kfunc_st_ops_inc10];"
"r1 = r6;"
"call subprog;"
"exit;"
:
: __imm(bpf_kfunc_st_ops_inc10)
: __clobber_all);
}
__success
/* save __u64 *ctx to stack */
__xlated("0: *(u64 *)(r10 -8) = r1")
/* main prog */
__xlated("1: r1 = *(u64 *)(r1 +0)")
__xlated("2: r6 = r1")
__xlated("3: call kernel-function")
__xlated("4: r1 = r6")
__xlated("5: call pc+")
/* epilogue */
__xlated("6: r1 = *(u64 *)(r10 -8)")
__xlated("7: r1 = *(u64 *)(r1 +0)")
__xlated("8: r6 = *(u64 *)(r1 +0)")
__xlated("9: r6 += 10000")
__xlated("10: *(u64 *)(r1 +0) = r6")
__xlated("11: r0 = r6")
__xlated("12: r0 *= 2")
__xlated("13: exit")
SEC("struct_ops/test_epilogue")
__naked int test_epilogue(void)
{
asm volatile (
"r1 = *(u64 *)(r1 +0);"
"r6 = r1;"
"call %[bpf_kfunc_st_ops_inc10];"
"r1 = r6;"
"call subprog;"
"exit;"
:
: __imm(bpf_kfunc_st_ops_inc10)
: __clobber_all);
}
__success
/* prologue */
__xlated("0: r6 = *(u64 *)(r1 +0)")
__xlated("1: r7 = *(u64 *)(r6 +0)")
__xlated("2: r7 += 1000")
__xlated("3: *(u64 *)(r6 +0) = r7")
/* save __u64 *ctx to stack */
__xlated("4: *(u64 *)(r10 -8) = r1")
/* main prog */
__xlated("5: r1 = *(u64 *)(r1 +0)")
__xlated("6: r6 = r1")
__xlated("7: call kernel-function")
__xlated("8: r1 = r6")
__xlated("9: call pc+")
/* epilogue */
__xlated("10: r1 = *(u64 *)(r10 -8)")
__xlated("11: r1 = *(u64 *)(r1 +0)")
__xlated("12: r6 = *(u64 *)(r1 +0)")
__xlated("13: r6 += 10000")
__xlated("14: *(u64 *)(r1 +0) = r6")
__xlated("15: r0 = r6")
__xlated("16: r0 *= 2")
__xlated("17: exit")
SEC("struct_ops/test_pro_epilogue")
__naked int test_pro_epilogue(void)
{
asm volatile (
"r1 = *(u64 *)(r1 +0);"
"r6 = r1;"
"call %[bpf_kfunc_st_ops_inc10];"
"r1 = r6;"
"call subprog;"
"exit;"
:
: __imm(bpf_kfunc_st_ops_inc10)
: __clobber_all);
}
SEC("syscall")
__retval(1011) /* PROLOGUE_A [1000] + KFUNC_INC10 + SUBPROG_A [1] */
int syscall_prologue(void *ctx)
{
struct st_ops_args args = {};
return bpf_kfunc_st_ops_test_prologue(&args);
}
SEC("syscall")
__retval(20022) /* (KFUNC_INC10 + SUBPROG_A [1] + EPILOGUE_A [10000]) * 2 */
int syscall_epilogue(void *ctx)
{
struct st_ops_args args = {};
return bpf_kfunc_st_ops_test_epilogue(&args);
}
SEC("syscall")
__retval(22022) /* (PROLOGUE_A [1000] + KFUNC_INC10 + SUBPROG_A [1] + EPILOGUE_A [10000]) * 2 */
int syscall_pro_epilogue(void *ctx)
{
struct st_ops_args args = {};
return bpf_kfunc_st_ops_test_pro_epilogue(&args);
}
SEC(".struct_ops.link")
struct bpf_testmod_st_ops pro_epilogue = {
.test_prologue = (void *)test_prologue,
.test_epilogue = (void *)test_epilogue,
.test_pro_epilogue = (void *)test_pro_epilogue,
};
|
