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Date: Mon, 26 Jul 2021 10:17:26 +0200 From: Johan Almbladh <johan.almbladh@...finetworks.com> To: ast@...nel.org, daniel@...earbox.net, andrii@...nel.org Cc: kafai@...com, songliubraving@...com, yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org, Tony.Ambardar@...il.com, netdev@...r.kernel.org, bpf@...r.kernel.org, Johan Almbladh <johan.almbladh@...finetworks.com> Subject: [RFC PATCH 02/14] bpf/tests: add BPF_MOV tests for zero and sign extension Tests for ALU32 and ALU64 MOV with different sizes of the immediate value. Depending on the immediate field width of the native CPU instructions, a JIT may generate code differently depending on the immediate value. Test that zero or sign extension is performed as expected. Mainly for JIT testing. Signed-off-by: Johan Almbladh <johan.almbladh@...finetworks.com> --- lib/test_bpf.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) diff --git a/lib/test_bpf.c b/lib/test_bpf.c index bfac033db590..9e232acddce8 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -2360,6 +2360,48 @@ static struct bpf_test tests[] = { { }, { { 0, 0x1 } }, }, + { + "ALU_MOV_K: small negative", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, -123), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, -123 } } + }, + { + "ALU_MOV_K: small negative zero extension", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, -123), + BPF_ALU64_IMM(BPF_RSH, R0, 32), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 0 } } + }, + { + "ALU_MOV_K: large negative", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, -123456789), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, -123456789 } } + }, + { + "ALU_MOV_K: large negative zero extension", + .u.insns_int = { + BPF_ALU32_IMM(BPF_MOV, R0, -123456789), + BPF_ALU64_IMM(BPF_RSH, R0, 32), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 0 } } + }, { "ALU64_MOV_K: dst = 2", .u.insns_int = { @@ -2412,6 +2454,48 @@ static struct bpf_test tests[] = { { }, { { 0, 0x1 } }, }, + { + "ALU64_MOV_K: small negative", + .u.insns_int = { + BPF_ALU64_IMM(BPF_MOV, R0, -123), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, -123 } } + }, + { + "ALU64_MOV_K: small negative sign extension", + .u.insns_int = { + BPF_ALU64_IMM(BPF_MOV, R0, -123), + BPF_ALU64_IMM(BPF_RSH, R0, 32), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 0xffffffff } } + }, + { + "ALU64_MOV_K: large negative", + .u.insns_int = { + BPF_ALU64_IMM(BPF_MOV, R0, -123456789), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, -123456789 } } + }, + { + "ALU64_MOV_K: large negative sign extension", + .u.insns_int = { + BPF_ALU64_IMM(BPF_MOV, R0, -123456789), + BPF_ALU64_IMM(BPF_RSH, R0, 32), + BPF_EXIT_INSN(), + }, + INTERNAL, + { }, + { { 0, 0xffffffff } } + }, /* BPF_ALU | BPF_ADD | BPF_X */ { "ALU_ADD_X: 1 + 2 = 3", -- 2.25.1
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