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bpf, tests: Add BPF_MOV tests for zero and sign extension

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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@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210809091829.810076-3-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-08-09 11:18:17 +02:00 committed by Daniel Borkmann
parent b55dfa8500
commit 565731acfc
1 changed files with 84 additions and 0 deletions
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84
lib/test_bpf.c
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@ -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",