From: Johan Almbladh <johan.almbladh@anyfinetworks.com>
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, iii@linux.ibm.com,
paul@cilium.io, yangtiezhu@loongson.cn, netdev@vger.kernel.org,
bpf@vger.kernel.org,
Johan Almbladh <johan.almbladh@anyfinetworks.com>
Subject: [PATCH bpf-next 04/10] bpf/tests: Add tests to check source register zero-extension
Date: Fri, 1 Oct 2021 15:03:42 +0200 [thread overview]
Message-ID: <20211001130348.3670534-5-johan.almbladh@anyfinetworks.com> (raw)
In-Reply-To: <20211001130348.3670534-1-johan.almbladh@anyfinetworks.com>
This patch adds tests to check that the source register is preserved when
zero-extending a 32-bit value. In particular, it checks that the source
operand is not zero-extended in-place.
Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
---
lib/test_bpf.c | 143 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 143 insertions(+)
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 84efb23e09d0..c7db90112ef0 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -10586,6 +10586,149 @@ static struct bpf_test tests[] = {
{},
{ { 0, 2 } },
},
+ /* Checking that ALU32 src is not zero extended in place */
+#define BPF_ALU32_SRC_ZEXT(op) \
+ { \
+ "ALU32_" #op "_X: src preserved in zext", \
+ .u.insns_int = { \
+ BPF_LD_IMM64(R1, 0x0123456789acbdefULL),\
+ BPF_LD_IMM64(R2, 0xfedcba9876543210ULL),\
+ BPF_ALU64_REG(BPF_MOV, R0, R1), \
+ BPF_ALU32_REG(BPF_##op, R2, R1), \
+ BPF_ALU64_REG(BPF_SUB, R0, R1), \
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_ALU64_IMM(BPF_RSH, R1, 32), \
+ BPF_ALU64_REG(BPF_OR, R0, R1), \
+ BPF_EXIT_INSN(), \
+ }, \
+ INTERNAL, \
+ { }, \
+ { { 0, 0 } }, \
+ }
+ BPF_ALU32_SRC_ZEXT(MOV),
+ BPF_ALU32_SRC_ZEXT(AND),
+ BPF_ALU32_SRC_ZEXT(OR),
+ BPF_ALU32_SRC_ZEXT(XOR),
+ BPF_ALU32_SRC_ZEXT(ADD),
+ BPF_ALU32_SRC_ZEXT(SUB),
+ BPF_ALU32_SRC_ZEXT(MUL),
+ BPF_ALU32_SRC_ZEXT(DIV),
+ BPF_ALU32_SRC_ZEXT(MOD),
+#undef BPF_ALU32_SRC_ZEXT
+ /* Checking that ATOMIC32 src is not zero extended in place */
+#define BPF_ATOMIC32_SRC_ZEXT(op) \
+ { \
+ "ATOMIC_W_" #op ": src preserved in zext", \
+ .u.insns_int = { \
+ BPF_LD_IMM64(R0, 0x0123456789acbdefULL), \
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_ST_MEM(BPF_W, R10, -4, 0), \
+ BPF_ATOMIC_OP(BPF_W, BPF_##op, R10, R1, -4), \
+ BPF_ALU64_REG(BPF_SUB, R0, R1), \
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_ALU64_IMM(BPF_RSH, R1, 32), \
+ BPF_ALU64_REG(BPF_OR, R0, R1), \
+ BPF_EXIT_INSN(), \
+ }, \
+ INTERNAL, \
+ { }, \
+ { { 0, 0 } }, \
+ .stack_depth = 8, \
+ }
+ BPF_ATOMIC32_SRC_ZEXT(ADD),
+ BPF_ATOMIC32_SRC_ZEXT(AND),
+ BPF_ATOMIC32_SRC_ZEXT(OR),
+ BPF_ATOMIC32_SRC_ZEXT(XOR),
+#undef BPF_ATOMIC32_SRC_ZEXT
+ /* Checking that CMPXCHG32 src is not zero extended in place */
+ {
+ "ATOMIC_W_CMPXCHG: src preserved in zext",
+ .u.insns_int = {
+ BPF_LD_IMM64(R1, 0x0123456789acbdefULL),
+ BPF_ALU64_REG(BPF_MOV, R2, R1),
+ BPF_ALU64_REG(BPF_MOV, R0, 0),
+ BPF_ST_MEM(BPF_W, R10, -4, 0),
+ BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R1, -4),
+ BPF_ALU64_REG(BPF_SUB, R1, R2),
+ BPF_ALU64_REG(BPF_MOV, R2, R1),
+ BPF_ALU64_IMM(BPF_RSH, R2, 32),
+ BPF_ALU64_REG(BPF_OR, R1, R2),
+ BPF_ALU64_REG(BPF_MOV, R0, R1),
+ BPF_EXIT_INSN(),
+ },
+ INTERNAL,
+ { },
+ { { 0, 0 } },
+ .stack_depth = 8,
+ },
+ /* Checking that JMP32 immediate src is not zero extended in place */
+#define BPF_JMP32_IMM_ZEXT(op) \
+ { \
+ "JMP32_" #op "_K: operand preserved in zext", \
+ .u.insns_int = { \
+ BPF_LD_IMM64(R0, 0x0123456789acbdefULL),\
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_JMP32_IMM(BPF_##op, R0, 1234, 1), \
+ BPF_JMP_A(0), /* Nop */ \
+ BPF_ALU64_REG(BPF_SUB, R0, R1), \
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_ALU64_IMM(BPF_RSH, R1, 32), \
+ BPF_ALU64_REG(BPF_OR, R0, R1), \
+ BPF_EXIT_INSN(), \
+ }, \
+ INTERNAL, \
+ { }, \
+ { { 0, 0 } }, \
+ }
+ BPF_JMP32_IMM_ZEXT(JEQ),
+ BPF_JMP32_IMM_ZEXT(JNE),
+ BPF_JMP32_IMM_ZEXT(JSET),
+ BPF_JMP32_IMM_ZEXT(JGT),
+ BPF_JMP32_IMM_ZEXT(JGE),
+ BPF_JMP32_IMM_ZEXT(JLT),
+ BPF_JMP32_IMM_ZEXT(JLE),
+ BPF_JMP32_IMM_ZEXT(JSGT),
+ BPF_JMP32_IMM_ZEXT(JSGE),
+ BPF_JMP32_IMM_ZEXT(JSGT),
+ BPF_JMP32_IMM_ZEXT(JSLT),
+ BPF_JMP32_IMM_ZEXT(JSLE),
+#undef BPF_JMP2_IMM_ZEXT
+ /* Checking that JMP32 dst & src are not zero extended in place */
+#define BPF_JMP32_REG_ZEXT(op) \
+ { \
+ "JMP32_" #op "_X: operands preserved in zext", \
+ .u.insns_int = { \
+ BPF_LD_IMM64(R0, 0x0123456789acbdefULL),\
+ BPF_LD_IMM64(R1, 0xfedcba9876543210ULL),\
+ BPF_ALU64_REG(BPF_MOV, R2, R0), \
+ BPF_ALU64_REG(BPF_MOV, R3, R1), \
+ BPF_JMP32_IMM(BPF_##op, R0, R1, 1), \
+ BPF_JMP_A(0), /* Nop */ \
+ BPF_ALU64_REG(BPF_SUB, R0, R2), \
+ BPF_ALU64_REG(BPF_SUB, R1, R3), \
+ BPF_ALU64_REG(BPF_OR, R0, R1), \
+ BPF_ALU64_REG(BPF_MOV, R1, R0), \
+ BPF_ALU64_IMM(BPF_RSH, R1, 32), \
+ BPF_ALU64_REG(BPF_OR, R0, R1), \
+ BPF_EXIT_INSN(), \
+ }, \
+ INTERNAL, \
+ { }, \
+ { { 0, 0 } }, \
+ }
+ BPF_JMP32_REG_ZEXT(JEQ),
+ BPF_JMP32_REG_ZEXT(JNE),
+ BPF_JMP32_REG_ZEXT(JSET),
+ BPF_JMP32_REG_ZEXT(JGT),
+ BPF_JMP32_REG_ZEXT(JGE),
+ BPF_JMP32_REG_ZEXT(JLT),
+ BPF_JMP32_REG_ZEXT(JLE),
+ BPF_JMP32_REG_ZEXT(JSGT),
+ BPF_JMP32_REG_ZEXT(JSGE),
+ BPF_JMP32_REG_ZEXT(JSGT),
+ BPF_JMP32_REG_ZEXT(JSLT),
+ BPF_JMP32_REG_ZEXT(JSLE),
+#undef BPF_JMP2_REG_ZEXT
/* Exhaustive test of ALU64 shift operations */
{
"ALU64_LSH_K: all shift values",
--
2.30.2
next prev parent reply other threads:[~2021-10-01 13:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 13:03 [PATCH bpf-next 00/10] bpf/tests: Extend eBPF JIT test suite Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 01/10] bpf/tests: Add tests of BPF_LDX and BPF_STX with small sizes Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 02/10] bpf/tests: Add zero-extension checks in BPF_ATOMIC tests Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 03/10] bpf/tests: Add exhaustive tests of BPF_ATOMIC magnitudes Johan Almbladh
2021-10-01 13:03 ` Johan Almbladh [this message]
2021-10-01 13:03 ` [PATCH bpf-next 05/10] bpf/tests: Add more tests for ALU and ATOMIC register clobbering Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 06/10] bpf/tests: Minor restructuring of ALU tests Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 07/10] bpf/tests: Add exhaustive tests of ALU register combinations Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 08/10] bpf/tests: Add exhaustive tests of BPF_ATOMIC " Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 09/10] bpf/tests: Add test of ALU shifts with operand register aliasing Johan Almbladh
2021-10-01 13:03 ` [PATCH bpf-next 10/10] bpf/tests: Add test of LDX_MEM with operand aliasing Johan Almbladh
2021-10-01 15:10 ` [PATCH bpf-next 00/10] bpf/tests: Extend eBPF JIT test suite patchwork-bot+netdevbpf
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