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98d666d05a
The prog_test that's added depends on Clang/LLVM features added by Yonghong in commit 286daafd6512 (was https://reviews.llvm.org/D72184). Note the use of a define called ENABLE_ATOMICS_TESTS: this is used to: - Avoid breaking the build for people on old versions of Clang - Avoid needing separate lists of test objects for no_alu32, where atomics are not supported even if Clang has the feature. The atomics_test.o BPF object is built unconditionally both for test_progs and test_progs-no_alu32. For test_progs, if Clang supports atomics, ENABLE_ATOMICS_TESTS is defined, so it includes the proper test code. Otherwise, progs and global vars are defined anyway, as stubs; this means that the skeleton user code still builds. The atomics_test.o userspace object is built once and used for both test_progs and test_progs-no_alu32. A variable called skip_tests is defined in the BPF object's data section, which tells the userspace object whether to skip the atomics test. Signed-off-by: Brendan Jackman <jackmanb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Link: https://lore.kernel.org/bpf/20210114181751.768687-11-jackmanb@google.com
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <stdbool.h>
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#ifdef ENABLE_ATOMICS_TESTS
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bool skip_tests __attribute((__section__(".data"))) = false;
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#else
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bool skip_tests = true;
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#endif
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__u64 add64_value = 1;
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__u64 add64_result = 0;
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__u32 add32_value = 1;
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__u32 add32_result = 0;
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__u64 add_stack_value_copy = 0;
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__u64 add_stack_result = 0;
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__u64 add_noreturn_value = 1;
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(add, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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__u64 add_stack_value = 1;
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add64_result = __sync_fetch_and_add(&add64_value, 2);
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add32_result = __sync_fetch_and_add(&add32_value, 2);
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add_stack_result = __sync_fetch_and_add(&add_stack_value, 2);
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add_stack_value_copy = add_stack_value;
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__sync_fetch_and_add(&add_noreturn_value, 2);
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#endif
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return 0;
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}
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__s64 sub64_value = 1;
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__s64 sub64_result = 0;
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__s32 sub32_value = 1;
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__s32 sub32_result = 0;
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__s64 sub_stack_value_copy = 0;
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__s64 sub_stack_result = 0;
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__s64 sub_noreturn_value = 1;
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(sub, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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__u64 sub_stack_value = 1;
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sub64_result = __sync_fetch_and_sub(&sub64_value, 2);
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sub32_result = __sync_fetch_and_sub(&sub32_value, 2);
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sub_stack_result = __sync_fetch_and_sub(&sub_stack_value, 2);
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sub_stack_value_copy = sub_stack_value;
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__sync_fetch_and_sub(&sub_noreturn_value, 2);
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#endif
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return 0;
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}
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__u64 and64_value = (0x110ull << 32);
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__u64 and64_result = 0;
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__u32 and32_value = 0x110;
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__u32 and32_result = 0;
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__u64 and_noreturn_value = (0x110ull << 32);
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(and, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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and64_result = __sync_fetch_and_and(&and64_value, 0x011ull << 32);
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and32_result = __sync_fetch_and_and(&and32_value, 0x011);
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__sync_fetch_and_and(&and_noreturn_value, 0x011ull << 32);
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#endif
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return 0;
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}
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__u64 or64_value = (0x110ull << 32);
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__u64 or64_result = 0;
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__u32 or32_value = 0x110;
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__u32 or32_result = 0;
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__u64 or_noreturn_value = (0x110ull << 32);
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(or, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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or64_result = __sync_fetch_and_or(&or64_value, 0x011ull << 32);
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or32_result = __sync_fetch_and_or(&or32_value, 0x011);
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__sync_fetch_and_or(&or_noreturn_value, 0x011ull << 32);
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#endif
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return 0;
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}
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__u64 xor64_value = (0x110ull << 32);
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__u64 xor64_result = 0;
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__u32 xor32_value = 0x110;
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__u32 xor32_result = 0;
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__u64 xor_noreturn_value = (0x110ull << 32);
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(xor, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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xor64_result = __sync_fetch_and_xor(&xor64_value, 0x011ull << 32);
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xor32_result = __sync_fetch_and_xor(&xor32_value, 0x011);
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__sync_fetch_and_xor(&xor_noreturn_value, 0x011ull << 32);
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#endif
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return 0;
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}
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__u64 cmpxchg64_value = 1;
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__u64 cmpxchg64_result_fail = 0;
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__u64 cmpxchg64_result_succeed = 0;
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__u32 cmpxchg32_value = 1;
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__u32 cmpxchg32_result_fail = 0;
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__u32 cmpxchg32_result_succeed = 0;
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(cmpxchg, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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cmpxchg64_result_fail = __sync_val_compare_and_swap(&cmpxchg64_value, 0, 3);
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cmpxchg64_result_succeed = __sync_val_compare_and_swap(&cmpxchg64_value, 1, 2);
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cmpxchg32_result_fail = __sync_val_compare_and_swap(&cmpxchg32_value, 0, 3);
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cmpxchg32_result_succeed = __sync_val_compare_and_swap(&cmpxchg32_value, 1, 2);
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#endif
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return 0;
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}
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__u64 xchg64_value = 1;
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__u64 xchg64_result = 0;
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__u32 xchg32_value = 1;
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__u32 xchg32_result = 0;
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SEC("fentry/bpf_fentry_test1")
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int BPF_PROG(xchg, int a)
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{
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#ifdef ENABLE_ATOMICS_TESTS
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__u64 val64 = 2;
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__u32 val32 = 2;
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xchg64_result = __sync_lock_test_and_set(&xchg64_value, val64);
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xchg32_result = __sync_lock_test_and_set(&xchg32_value, val32);
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#endif
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return 0;
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}
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