From 791caeb084c57e3a4d648cf1ee799d1f70c0ef4e Mon Sep 17 00:00:00 2001 From: David Daney Date: Wed, 24 May 2017 16:35:49 -0700 Subject: [PATCH] test_bpf: Add a couple of tests for BPF_JSGE. Some JITs can optimize comparisons with zero. Add a couple of BPF_JSGE tests against immediate zero. Signed-off-by: David Daney Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- lib/test_bpf.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/lib/test_bpf.c b/lib/test_bpf.c index 889bc31785be..be88cbaadde3 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -4504,6 +4504,44 @@ static struct bpf_test tests[] = { { }, { { 0, 1 } }, }, + { + "JMP_JSGE_K: Signed jump: value walk 1", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, 0), + BPF_LD_IMM64(R1, -3), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 6), + BPF_ALU64_IMM(BPF_ADD, R1, 1), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 4), + BPF_ALU64_IMM(BPF_ADD, R1, 1), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 2), + BPF_ALU64_IMM(BPF_ADD, R1, 1), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 1), + BPF_EXIT_INSN(), /* bad exit */ + BPF_ALU32_IMM(BPF_MOV, R0, 1), /* good exit */ + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 1 } }, + }, + { + "JMP_JSGE_K: Signed jump: value walk 2", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, 0), + BPF_LD_IMM64(R1, -3), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 4), + BPF_ALU64_IMM(BPF_ADD, R1, 2), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 2), + BPF_ALU64_IMM(BPF_ADD, R1, 2), + BPF_JMP_IMM(BPF_JSGE, R1, 0, 1), + BPF_EXIT_INSN(), /* bad exit */ + BPF_ALU32_IMM(BPF_MOV, R0, 1), /* good exit */ + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 1 } }, + }, /* BPF_JMP | BPF_JGT | BPF_K */ { "JMP_JGT_K: if (3 > 2) return 1", -- 2.20.1