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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@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",