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[213.115.136.2]) by smtp.gmail.com with ESMTPSA id bd24sm139349edb.56.2021.07.28.10.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jul 2021 10:05:40 -0700 (PDT) From: Johan Almbladh To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org Cc: kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, Tony.Ambardar@gmail.com, netdev@vger.kernel.org, bpf@vger.kernel.org, Johan Almbladh Subject: [PATCH 10/14] bpf/tests: Add branch conversion JIT test Date: Wed, 28 Jul 2021 19:04:58 +0200 Message-Id: <20210728170502.351010-11-johan.almbladh@anyfinetworks.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210728170502.351010-1-johan.almbladh@anyfinetworks.com> References: <20210728170502.351010-1-johan.almbladh@anyfinetworks.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Some JITs may need to convert a conditional jump instruction to to short PC-relative branch and a long unconditional jump, if the PC-relative offset exceeds offset field width in the CPU instruction. This test triggers such branch conversion on the 32-bit MIPS JIT. Signed-off-by: Johan Almbladh --- lib/test_bpf.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/lib/test_bpf.c b/lib/test_bpf.c index 8b94902702ed..55914b6236aa 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -461,6 +461,36 @@ static int bpf_fill_stxdw(struct bpf_test *self) return __bpf_fill_stxdw(self, BPF_DW); } +static int bpf_fill_long_jmp(struct bpf_test *self) +{ + unsigned int len = BPF_MAXINSNS; + struct bpf_insn *insn; + int i; + + insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL); + if (!insn) + return -ENOMEM; + + insn[0] = BPF_ALU64_IMM(BPF_MOV, R0, 1); + insn[1] = BPF_JMP_IMM(BPF_JEQ, R0, 1, len - 2 - 1); + + /* + * Fill with a complex 64-bit operation that expands to a lot of + * instructions on 32-bit JITs. The large jump offset can then + * overflow the conditional branch field size, triggering a branch + * conversion mechanism in some JITs. + */ + for (i = 2; i < len - 1; i++) + insn[i] = BPF_ALU64_IMM(BPF_MUL, R0, (i << 16) + i); + + insn[len - 1] = BPF_EXIT_INSN(); + + self->u.ptr.insns = insn; + self->u.ptr.len = len; + + return 0; +} + static struct bpf_test tests[] = { { "TAX", @@ -6892,6 +6922,14 @@ static struct bpf_test tests[] = { { }, { { 0, 1 } }, }, + { /* Mainly checking JIT here. */ + "BPF_MAXINSNS: Very long conditional jump", + { }, + INTERNAL | FLAG_NO_DATA, + { }, + { { 0, 1 } }, + .fill_helper = bpf_fill_long_jmp, + }, { "JMP_JA: Jump, gap, jump, ...", { }, -- 2.25.1