tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/bpf.h>
4#include <bpf/bpf_helpers.h>
5#include "bpf_misc.h"
6
7#if (defined(__TARGET_ARCH_arm64) || defined(__TARGET_ARCH_x86) || \
8 (defined(__TARGET_ARCH_riscv) && __riscv_xlen == 64) || \
9 defined(__TARGET_ARCH_arm) || defined(__TARGET_ARCH_s390) || \
10 defined(__TARGET_ARCH_loongarch)) && \
11 __clang_major__ >= 18
12
13SEC("socket")
14__description("BSWAP, 16")
15__success __success_unpriv __retval(0x23ff)
16__naked void bswap_16(void)
17{
18 asm volatile (" \
19 r0 = 0xff23; \
20 r0 = bswap16 r0; \
21 exit; \
22" ::: __clobber_all);
23}
24
25SEC("socket")
26__description("BSWAP, 32")
27__success __success_unpriv __retval(0x23ff0000)
28__naked void bswap_32(void)
29{
30 asm volatile (" \
31 r0 = 0xff23; \
32 r0 = bswap32 r0; \
33 exit; \
34" ::: __clobber_all);
35}
36
37SEC("socket")
38__description("BSWAP, 64")
39__success __success_unpriv __retval(0x34ff12ff)
40__naked void bswap_64(void)
41{
42 asm volatile (" \
43 r0 = %[u64_val] ll; \
44 r0 = bswap64 r0; \
45 exit; \
46" :
47 : [u64_val]"i"(0xff12ff34ff56ff78ull)
48 : __clobber_all);
49}
50
51#define BSWAP_RANGE_TEST(name, op, in_value, out_value) \
52 SEC("socket") \
53 __success __log_level(2) \
54 __msg("r0 &= {{.*}}; R0=scalar({{.*}},var_off=(0x0; " #in_value "))") \
55 __msg("r0 = " op " r0 {{.*}}; R0=scalar({{.*}},var_off=(0x0; " #out_value "))") \
56 __naked void name(void) \
57 { \
58 asm volatile ( \
59 "call %[bpf_get_prandom_u32];" \
60 "r0 &= " #in_value ";" \
61 "r0 = " op " r0;" \
62 "r2 = " #out_value " ll;" \
63 "if r0 > r2 goto trap_%=;" \
64 "r0 = 0;" \
65 "exit;" \
66 "trap_%=:" \
67 "r1 = 42;" \
68 "r0 = *(u64 *)(r1 + 0);" \
69 "exit;" \
70 : \
71 : __imm(bpf_get_prandom_u32) \
72 : __clobber_all); \
73 }
74
75BSWAP_RANGE_TEST(bswap16_range, "bswap16", 0x3f00, 0x3f)
76BSWAP_RANGE_TEST(bswap32_range, "bswap32", 0x3f00, 0x3f0000)
77BSWAP_RANGE_TEST(bswap64_range, "bswap64", 0x3f00, 0x3f000000000000)
78#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
79BSWAP_RANGE_TEST(be16_range, "be16", 0x3f00, 0x3f)
80BSWAP_RANGE_TEST(be32_range, "be32", 0x3f00, 0x3f0000)
81BSWAP_RANGE_TEST(be64_range, "be64", 0x3f00, 0x3f000000000000)
82BSWAP_RANGE_TEST(le16_range, "le16", 0x3f00, 0x3f00)
83BSWAP_RANGE_TEST(le32_range, "le32", 0x3f00, 0x3f00)
84BSWAP_RANGE_TEST(le64_range, "le64", 0x3f00, 0x3f00)
85#else
86BSWAP_RANGE_TEST(be16_range, "be16", 0x3f00, 0x3f00)
87BSWAP_RANGE_TEST(be32_range, "be32", 0x3f00, 0x3f00)
88BSWAP_RANGE_TEST(be64_range, "be64", 0x3f00, 0x3f00)
89BSWAP_RANGE_TEST(le16_range, "le16", 0x3f00, 0x3f)
90BSWAP_RANGE_TEST(le32_range, "le32", 0x3f00, 0x3f0000)
91BSWAP_RANGE_TEST(le64_range, "le64", 0x3f00, 0x3f000000000000)
92#endif
93
94SEC("socket")
95__description("BSWAP, reset reg id")
96__failure __msg("math between fp pointer and register with unbounded min value is not allowed")
97__naked void bswap_reset_reg_id(void)
98{
99 asm volatile (" \
100 call %[bpf_ktime_get_ns]; \
101 r1 = r0; \
102 r0 = be16 r0; \
103 if r0 != 1 goto l0_%=; \
104 r2 = r10; \
105 r2 += -512; \
106 r2 += r1; \
107 *(u8 *)(r2 + 0) = 0; \
108l0_%=: \
109 r0 = 0; \
110 exit; \
111" :
112 : __imm(bpf_ktime_get_ns)
113 : __clobber_all);
114}
115
116#else
117
118SEC("socket")
119__description("cpuv4 is not supported by compiler or jit, use a dummy test")
120__success
121int dummy_test(void)
122{
123 return 0;
124}
125
126#endif
127
128char _license[] SEC("license") = "GPL";