summaryrefslogtreecommitdiffstats
path: root/tools/testing/selftests/bpf/progs/arena_atomics.c
blob: 55f10563208de724d026f532076fa1ac47d5bdb1 (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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <stdbool.h>
#include "bpf_arena_common.h"

struct {
	__uint(type, BPF_MAP_TYPE_ARENA);
	__uint(map_flags, BPF_F_MMAPABLE);
	__uint(max_entries, 10); /* number of pages */
#ifdef __TARGET_ARCH_arm64
	__ulong(map_extra, 0x1ull << 32); /* start of mmap() region */
#else
	__ulong(map_extra, 0x1ull << 44); /* start of mmap() region */
#endif
} arena SEC(".maps");

#if defined(ENABLE_ATOMICS_TESTS) && defined(__BPF_FEATURE_ADDR_SPACE_CAST)
bool skip_tests __attribute((__section__(".data"))) = false;
#else
bool skip_tests = true;
#endif

__u32 pid = 0;

#undef __arena
#if defined(__BPF_FEATURE_ADDR_SPACE_CAST)
#define __arena __attribute__((address_space(1)))
#else
#define __arena SEC(".addr_space.1")
#endif

__u64 __arena add64_value = 1;
__u64 __arena add64_result = 0;
__u32 __arena add32_value = 1;
__u32 __arena add32_result = 0;
__u64 __arena add_stack_value_copy = 0;
__u64 __arena add_stack_result = 0;
__u64 __arena add_noreturn_value = 1;

SEC("raw_tp/sys_enter")
int add(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	__u64 add_stack_value = 1;

	add64_result = __sync_fetch_and_add(&add64_value, 2);
	add32_result = __sync_fetch_and_add(&add32_value, 2);
	add_stack_result = __sync_fetch_and_add(&add_stack_value, 2);
	add_stack_value_copy = add_stack_value;
	__sync_fetch_and_add(&add_noreturn_value, 2);
#endif

	return 0;
}

__s64 __arena sub64_value = 1;
__s64 __arena sub64_result = 0;
__s32 __arena sub32_value = 1;
__s32 __arena sub32_result = 0;
__s64 __arena sub_stack_value_copy = 0;
__s64 __arena sub_stack_result = 0;
__s64 __arena sub_noreturn_value = 1;

SEC("raw_tp/sys_enter")
int sub(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	__u64 sub_stack_value = 1;

	sub64_result = __sync_fetch_and_sub(&sub64_value, 2);
	sub32_result = __sync_fetch_and_sub(&sub32_value, 2);
	sub_stack_result = __sync_fetch_and_sub(&sub_stack_value, 2);
	sub_stack_value_copy = sub_stack_value;
	__sync_fetch_and_sub(&sub_noreturn_value, 2);
#endif

	return 0;
}

__u64 __arena and64_value = (0x110ull << 32);
__u32 __arena and32_value = 0x110;

SEC("raw_tp/sys_enter")
int and(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS

	__sync_fetch_and_and(&and64_value, 0x011ull << 32);
	__sync_fetch_and_and(&and32_value, 0x011);
#endif

	return 0;
}

__u32 __arena or32_value = 0x110;
__u64 __arena or64_value = (0x110ull << 32);

SEC("raw_tp/sys_enter")
int or(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	__sync_fetch_and_or(&or64_value, 0x011ull << 32);
	__sync_fetch_and_or(&or32_value, 0x011);
#endif

	return 0;
}

__u64 __arena xor64_value = (0x110ull << 32);
__u32 __arena xor32_value = 0x110;

SEC("raw_tp/sys_enter")
int xor(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	__sync_fetch_and_xor(&xor64_value, 0x011ull << 32);
	__sync_fetch_and_xor(&xor32_value, 0x011);
#endif

	return 0;
}

__u32 __arena cmpxchg32_value = 1;
__u32 __arena cmpxchg32_result_fail = 0;
__u32 __arena cmpxchg32_result_succeed = 0;
__u64 __arena cmpxchg64_value = 1;
__u64 __arena cmpxchg64_result_fail = 0;
__u64 __arena cmpxchg64_result_succeed = 0;

SEC("raw_tp/sys_enter")
int cmpxchg(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	cmpxchg64_result_fail = __sync_val_compare_and_swap(&cmpxchg64_value, 0, 3);
	cmpxchg64_result_succeed = __sync_val_compare_and_swap(&cmpxchg64_value, 1, 2);

	cmpxchg32_result_fail = __sync_val_compare_and_swap(&cmpxchg32_value, 0, 3);
	cmpxchg32_result_succeed = __sync_val_compare_and_swap(&cmpxchg32_value, 1, 2);
#endif

	return 0;
}

__u64 __arena xchg64_value = 1;
__u64 __arena xchg64_result = 0;
__u32 __arena xchg32_value = 1;
__u32 __arena xchg32_result = 0;

SEC("raw_tp/sys_enter")
int xchg(const void *ctx)
{
	if (pid != (bpf_get_current_pid_tgid() >> 32))
		return 0;
#ifdef ENABLE_ATOMICS_TESTS
	__u64 val64 = 2;
	__u32 val32 = 2;

	xchg64_result = __sync_lock_test_and_set(&xchg64_value, val64);
	xchg32_result = __sync_lock_test_and_set(&xchg32_value, val32);
#endif

	return 0;
}