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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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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
46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
{
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"atomic exchange smoketest - 64bit",
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.insns = {
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/* val = 3; */
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BPF_ST_MEM(BPF_DW, BPF_REG_10, -8, 3),
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/* old = atomic_xchg(&val, 4); */
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BPF_MOV64_IMM(BPF_REG_1, 4),
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BPF_ATOMIC_OP(BPF_DW, BPF_XCHG, BPF_REG_10, BPF_REG_1, -8),
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/* if (old != 3) exit(1); */
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
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BPF_MOV64_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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/* if (val != 4) exit(2); */
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BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_10, -8),
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BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
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BPF_MOV64_IMM(BPF_REG_0, 2),
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BPF_EXIT_INSN(),
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/* exit(0); */
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BPF_MOV64_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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},
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{
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"atomic exchange smoketest - 32bit",
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.insns = {
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/* val = 3; */
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BPF_ST_MEM(BPF_W, BPF_REG_10, -4, 3),
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/* old = atomic_xchg(&val, 4); */
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BPF_MOV32_IMM(BPF_REG_1, 4),
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BPF_ATOMIC_OP(BPF_W, BPF_XCHG, BPF_REG_10, BPF_REG_1, -4),
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/* if (old != 3) exit(1); */
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BPF_JMP32_IMM(BPF_JEQ, BPF_REG_1, 3, 2),
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BPF_MOV32_IMM(BPF_REG_0, 1),
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BPF_EXIT_INSN(),
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/* if (val != 4) exit(2); */
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BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_10, -4),
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BPF_JMP32_IMM(BPF_JEQ, BPF_REG_0, 4, 2),
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BPF_MOV32_IMM(BPF_REG_0, 2),
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BPF_EXIT_INSN(),
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/* exit(0); */
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BPF_MOV32_IMM(BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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},
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.result = ACCEPT,
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},
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