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| author | Puranjay Mohan <puranjay@kernel.org> | 2026-08-13 12:03:52 -0700 |
|---|---|---|
| committer | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-08-14 05:55:02 +0200 |
| commit | 1c5bc60f957d853ec7183d79419360979dddd421 (patch) | |
| tree | 24f3c464a8bdd9f874fa191fd3e10c3907724c81 /tools/testing/selftests/bpf | |
| parent | bb5bad6a78b6334ab9f8ab99cdb92bae11d9acea (diff) | |
| download | linux-next-1c5bc60f957d853ec7183d79419360979dddd421.tar.gz linux-next-1c5bc60f957d853ec7183d79419360979dddd421.zip | |
selftests/bpf: Add arm64 JIT-sequence tests for __arena kfunc arguments
Pin the arm64 counterparts of the x86-64 rebase sequences: the single
extended-register add for an unconditional argument, the nullable
truncate-test-and-skip variant, and all five argument registers in one
call. The nullable cases use a local label so the branch is pinned to
the instruction right after the add, and the label line does not spell
out the call because arm64 emits either a direct bl or a materialize-
and-blr pair depending on the distance to the kfunc.
Note that on arm64 an unconditional argument is one instruction with
nothing to anchor it against, so arena_arg_jit_rebase alone cannot tell
the two forms apart; it only requires that nothing is emitted between
the rebase and the call. The args5 test is what pins the distinction,
since its four consecutive adds leave no room for a nullable
truncate-and-branch pair between them.
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Acked-by: Xu Kuohai <xukuohai@huawei.com>
Link: https://lore.kernel.org/bpf/20260813190356.335181-6-puranjay@kernel.org
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Diffstat (limited to 'tools/testing/selftests/bpf')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/arena_kfunc_jit.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/arena_kfunc_jit.c b/tools/testing/selftests/bpf/progs/arena_kfunc_jit.c index c9b918662616..b5a01cbc33a7 100644 --- a/tools/testing/selftests/bpf/progs/arena_kfunc_jit.c +++ b/tools/testing/selftests/bpf/progs/arena_kfunc_jit.c @@ -32,6 +32,10 @@ __jited(" movl %edi, %edi") __jited(" addq %r12, %rdi") __jited("...") __jited(" callq {{.*}}") +__arch_arm64 +__jited("...") +__jited(" add x0, x28, w0, uxtw") +__jited(" {{(bl|mov) .*}}") __success int arena_arg_jit_rebase(void *ctx) { @@ -48,6 +52,12 @@ __jited(" testl %edi, %edi") __jited(" je L0") __jited(" addq %r12, %rdi") __jited("L0: callq {{.*}}") +__arch_arm64 +__jited("...") +__jited(" mov w0, w0") +__jited(" cbz w0, L0") +__jited(" add x0, x28, w0, uxtw") +__jited("L0: {{.*}}") __success int arena_arg_jit_nullable(void *ctx) { @@ -72,6 +82,16 @@ __jited(" testl %r8d, %r8d") __jited(" je L0") __jited(" addq %r12, %r8") __jited("L0: callq {{.*}}") +__arch_arm64 +__jited("...") +__jited(" add x0, x28, w0, uxtw") +__jited(" add x1, x28, w1, uxtw") +__jited(" add x2, x28, w2, uxtw") +__jited(" add x3, x28, w3, uxtw") +__jited(" mov w4, w4") +__jited(" cbz w4, L0") +__jited(" add x4, x28, w4, uxtw") +__jited("L0: {{.*}}") __success int arena_arg_jit_args5(void *ctx) { |