diff mbox series

[bpf-next,v3,8/9] bpf/tests: add tests for cpuv4 instructions

Message ID 20230907230550.1417590-9-puranjay12@gmail.com (mailing list archive)
State Accepted
Commit daabb2b098e04753fa3d1b1feed13e5a61bef61c
Delegated to: BPF
Headers show
Series arm32, bpf: add support for cpuv4 insns | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2691 this patch: 2691
netdev/cc_maintainers success CCed 12 of 12 maintainers
netdev/build_clang success Errors and warnings before: 1496 this patch: 1496
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2737 this patch: 2737
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 486 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Puranjay Mohan Sept. 7, 2023, 11:05 p.m. UTC 
The BPF JITs now support cpuv4 instructions. Add tests for these new
instructions to the test suite:

1. Sign extended Load
2. Sign extended Mov
3. Unconditional byte swap
4. Unconditional jump with 32-bit offset
5. Signed division and modulo

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
---
 include/linux/filter.h |  50 +++++-
 lib/test_bpf.c         | 371 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 417 insertions(+), 4 deletions(-)

Comments

kernel test robot Sept. 26, 2023, 6:45 a.m. UTC | #1 
Hello,

kernel test robot noticed "kernel-selftests.net.test_bpf.sh.fail" on:

commit: 361ceaa10db461a35068f21db451a02c07e2a6bd ("[PATCH bpf-next v3 8/9] bpf/tests: add tests for cpuv4 instructions")
url: https://github.com/intel-lab-lkp/linux/commits/Puranjay-Mohan/arm32-bpf-add-support-for-32-bit-offset-jmp-instruction/20230908-070721
base: https://git.kernel.org/cgit/linux/kernel/git/bpf/bpf-next.git master
patch link: https://lore.kernel.org/all/20230907230550.1417590-9-puranjay12@gmail.com/
patch subject: [PATCH bpf-next v3 8/9] bpf/tests: add tests for cpuv4 instructions

in testcase: kernel-selftests
version: kernel-selftests-x86_64-60acb023-1_20230329
with following parameters:

	group: net



compiler: gcc-12
test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 32G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)




If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202309261451.8934f9ad-oliver.sang@intel.com



# timeout set to 1500
# selftests: net: test_bpf.sh
# test_bpf: [FAIL]
not ok 13 selftests: net: test_bpf.sh # exit=1



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20230926/202309261451.8934f9ad-oliver.sang@intel.com
diff mbox series

Patch

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 761af6b3cf2b..0138832ad571 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -117,21 +117,25 @@  struct ctl_table_header;
 
 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 
-#define BPF_ALU64_IMM(OP, DST, IMM)				\
+#define BPF_ALU64_IMM_OFF(OP, DST, IMM, OFF)			\
 	((struct bpf_insn) {					\
 		.code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,	\
 		.dst_reg = DST,					\
 		.src_reg = 0,					\
-		.off   = 0,					\
+		.off   = OFF,					\
 		.imm   = IMM })
+#define BPF_ALU64_IMM(OP, DST, IMM)				\
+	BPF_ALU64_IMM_OFF(OP, DST, IMM, 0)
 
-#define BPF_ALU32_IMM(OP, DST, IMM)				\
+#define BPF_ALU32_IMM_OFF(OP, DST, IMM, OFF)			\
 	((struct bpf_insn) {					\
 		.code  = BPF_ALU | BPF_OP(OP) | BPF_K,		\
 		.dst_reg = DST,					\
 		.src_reg = 0,					\
-		.off   = 0,					\
+		.off   = OFF,					\
 		.imm   = IMM })
+#define BPF_ALU32_IMM(OP, DST, IMM)				\
+	BPF_ALU32_IMM_OFF(OP, DST, IMM, 0)
 
 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 
@@ -143,6 +147,16 @@  struct ctl_table_header;
 		.off   = 0,					\
 		.imm   = LEN })
 
+/* Byte Swap, bswap16/32/64 */
+
+#define BPF_BSWAP(DST, LEN)					\
+	((struct bpf_insn) {					\
+		.code  = BPF_ALU64 | BPF_END | BPF_SRC(BPF_TO_LE),	\
+		.dst_reg = DST,					\
+		.src_reg = 0,					\
+		.off   = 0,					\
+		.imm   = LEN })
+
 /* Short form of mov, dst_reg = src_reg */
 
 #define BPF_MOV64_REG(DST, SRC)					\
@@ -179,6 +193,24 @@  struct ctl_table_header;
 		.off   = 0,					\
 		.imm   = IMM })
 
+/* Short form of movsx, dst_reg = (s8,s16,s32)src_reg */
+
+#define BPF_MOVSX64_REG(DST, SRC, OFF)				\
+	((struct bpf_insn) {					\
+		.code  = BPF_ALU64 | BPF_MOV | BPF_X,		\
+		.dst_reg = DST,					\
+		.src_reg = SRC,					\
+		.off   = OFF,					\
+		.imm   = 0 })
+
+#define BPF_MOVSX32_REG(DST, SRC, OFF)				\
+	((struct bpf_insn) {					\
+		.code  = BPF_ALU | BPF_MOV | BPF_X,		\
+		.dst_reg = DST,					\
+		.src_reg = SRC,					\
+		.off   = OFF,					\
+		.imm   = 0 })
+
 /* Special form of mov32, used for doing explicit zero extension on dst. */
 #define BPF_ZEXT_REG(DST)					\
 	((struct bpf_insn) {					\
@@ -263,6 +295,16 @@  static inline bool insn_is_zext(const struct bpf_insn *insn)
 		.off   = OFF,					\
 		.imm   = 0 })
 
+/* Memory load, dst_reg = *(signed size *) (src_reg + off16) */
+
+#define BPF_LDX_MEMSX(SIZE, DST, SRC, OFF)			\
+	((struct bpf_insn) {					\
+		.code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEMSX,	\
+		.dst_reg = DST,					\
+		.src_reg = SRC,					\
+		.off   = OFF,					\
+		.imm   = 0 })
+
 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 
 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)			\
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index ecde4216201e..7916503e6a6a 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -5111,6 +5111,104 @@  static struct bpf_test tests[] = {
 		{ },
 		{ { 0, 0xffffffff } }
 	},
+	/* MOVSX32 */
+	{
+		"ALU_MOVSX | BPF_B",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x00000000ffffffefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX32_REG(R1, R3, 8),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_MOVSX | BPF_H",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x00000000ffffbeefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX32_REG(R1, R3, 16),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU_MOVSX | BPF_W",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0x00000000deadbeefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX32_REG(R1, R3, 32),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	/* MOVSX64 REG */
+	{
+		"ALU64_MOVSX | BPF_B",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0xffffffffffffffefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX64_REG(R1, R3, 8),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU64_MOVSX | BPF_H",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0xffffffffffffbeefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX64_REG(R1, R3, 16),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
+	{
+		"ALU64_MOVSX | BPF_W",
+		.u.insns_int = {
+			BPF_LD_IMM64(R2, 0xffffffffdeadbeefLL),
+			BPF_LD_IMM64(R3, 0xdeadbeefdeadbeefLL),
+			BPF_MOVSX64_REG(R1, R3, 32),
+			BPF_JMP_REG(BPF_JEQ, R2, R1, 2),
+			BPF_MOV32_IMM(R0, 2),
+			BPF_EXIT_INSN(),
+			BPF_MOV32_IMM(R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1 } },
+	},
 	/* BPF_ALU | BPF_ADD | BPF_X */
 	{
 		"ALU_ADD_X: 1 + 2 = 3",
@@ -6105,6 +6203,106 @@  static struct bpf_test tests[] = {
 		{ },
 		{ { 0, 2 } },
 	},
+	/* BPF_ALU | BPF_DIV | BPF_X off=1 (SDIV) */
+	{
+		"ALU_SDIV_X: -6 / 2 = -3",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -6),
+			BPF_ALU32_IMM(BPF_MOV, R1, 2),
+			BPF_ALU32_REG_OFF(BPF_DIV, R0, R1, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -3 } },
+	},
+	/* BPF_ALU | BPF_DIV | BPF_K off=1 (SDIV) */
+	{
+		"ALU_SDIV_K: -6 / 2 = -3",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -6),
+			BPF_ALU32_IMM_OFF(BPF_DIV, R0, 2, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -3 } },
+	},
+	/* BPF_ALU64 | BPF_DIV | BPF_X off=1 (SDIV64) */
+	{
+		"ALU64_SDIV_X: -6 / 2 = -3",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -6),
+			BPF_ALU32_IMM(BPF_MOV, R1, 2),
+			BPF_ALU64_REG_OFF(BPF_DIV, R0, R1, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -3 } },
+	},
+	/* BPF_ALU64 | BPF_DIV | BPF_K off=1 (SDIV64) */
+	{
+		"ALU64_SDIV_K: -6 / 2 = -3",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -6),
+			BPF_ALU64_IMM_OFF(BPF_DIV, R0, 2, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -3 } },
+	},
+	/* BPF_ALU | BPF_MOD | BPF_X off=1 (SMOD) */
+	{
+		"ALU_SMOD_X: -7 % 2 = -1",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -7),
+			BPF_ALU32_IMM(BPF_MOV, R1, 2),
+			BPF_ALU32_REG_OFF(BPF_MOD, R0, R1, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -1 } },
+	},
+	/* BPF_ALU | BPF_MOD | BPF_K off=1 (SMOD) */
+	{
+		"ALU_SMOD_K: -7 % 2 = -1",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -7),
+			BPF_ALU32_IMM_OFF(BPF_MOD, R0, 2, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -1 } },
+	},
+	/* BPF_ALU64 | BPF_MOD | BPF_X off=1 (SMOD64) */
+	{
+		"ALU64_SMOD_X: -7 % 2 = -1",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -7),
+			BPF_ALU32_IMM(BPF_MOV, R1, 2),
+			BPF_ALU64_REG_OFF(BPF_MOD, R0, R1, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -1 } },
+	},
+	/* BPF_ALU64 | BPF_MOD | BPF_K off=1 (SMOD64) */
+	{
+		"ALU64_SMOD_X: -7 % 2 = -1",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, -7),
+			BPF_ALU64_IMM_OFF(BPF_MOD, R0, 2, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, -1 } },
+	},
 	/* BPF_ALU | BPF_AND | BPF_X */
 	{
 		"ALU_AND_X: 3 & 2 = 2",
@@ -7837,6 +8035,104 @@  static struct bpf_test tests[] = {
 		{ },
 		{ { 0, (u32) (cpu_to_le64(0xfedcba9876543210ULL) >> 32) } },
 	},
+	/* BSWAP */
+	{
+		"BSWAP 16: 0x0123456789abcdef -> 0xefcd",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0x0123456789abcdefLL),
+			BPF_BSWAP(R0, 16),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0xefcd } },
+	},
+	{
+		"BSWAP 32: 0x0123456789abcdef -> 0xefcdab89",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0x0123456789abcdefLL),
+			BPF_BSWAP(R0, 32),
+			BPF_ALU64_REG(BPF_MOV, R1, R0),
+			BPF_ALU64_IMM(BPF_RSH, R1, 32),
+			BPF_ALU32_REG(BPF_ADD, R0, R1), /* R1 = 0 */
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0xefcdab89 } },
+	},
+	{
+		"BSWAP 64: 0x0123456789abcdef -> 0x67452301",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0x0123456789abcdefLL),
+			BPF_BSWAP(R0, 64),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x67452301 } },
+	},
+	{
+		"BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0x0123456789abcdefLL),
+			BPF_BSWAP(R0, 64),
+			BPF_ALU64_IMM(BPF_RSH, R0, 32),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0xefcdab89 } },
+	},
+	/* BSWAP, reversed */
+	{
+		"BSWAP 16: 0xfedcba9876543210 -> 0x1032",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0xfedcba9876543210ULL),
+			BPF_BSWAP(R0, 16),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x1032 } },
+	},
+	{
+		"BSWAP 32: 0xfedcba9876543210 -> 0x10325476",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0xfedcba9876543210ULL),
+			BPF_BSWAP(R0, 32),
+			BPF_ALU64_REG(BPF_MOV, R1, R0),
+			BPF_ALU64_IMM(BPF_RSH, R1, 32),
+			BPF_ALU32_REG(BPF_ADD, R0, R1), /* R1 = 0 */
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x10325476 } },
+	},
+	{
+		"BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0xfedcba9876543210ULL),
+			BPF_BSWAP(R0, 64),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x98badcfe } },
+	},
+	{
+		"BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476",
+		.u.insns_int = {
+			BPF_LD_IMM64(R0, 0xfedcba9876543210ULL),
+			BPF_BSWAP(R0, 64),
+			BPF_ALU64_IMM(BPF_RSH, R0, 32),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0x10325476 } },
+	},
 	/* BPF_LDX_MEM B/H/W/DW */
 	{
 		"BPF_LDX_MEM | BPF_B, base",
@@ -8228,6 +8524,67 @@  static struct bpf_test tests[] = {
 		{ { 32, 0 } },
 		.stack_depth = 0,
 	},
+	/* BPF_LDX_MEMSX B/H/W */
+	{
+		"BPF_LDX_MEMSX | BPF_B",
+		.u.insns_int = {
+			BPF_LD_IMM64(R1, 0xdead0000000000f0ULL),
+			BPF_LD_IMM64(R2, 0xfffffffffffffff0ULL),
+			BPF_STX_MEM(BPF_DW, R10, R1, -8),
+#ifdef __BIG_ENDIAN
+			BPF_LDX_MEMSX(BPF_B, R0, R10, -1),
+#else
+			BPF_LDX_MEMSX(BPF_B, R0, R10, -8),
+#endif
+			BPF_JMP_REG(BPF_JNE, R0, R2, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0 } },
+		.stack_depth = 8,
+	},
+	{
+		"BPF_LDX_MEMSX | BPF_H",
+		.u.insns_int = {
+			BPF_LD_IMM64(R1, 0xdead00000000f123ULL),
+			BPF_LD_IMM64(R2, 0xfffffffffffff123ULL),
+			BPF_STX_MEM(BPF_DW, R10, R1, -8),
+#ifdef __BIG_ENDIAN
+			BPF_LDX_MEMSX(BPF_H, R0, R10, -2),
+#else
+			BPF_LDX_MEMSX(BPF_H, R0, R10, -8),
+#endif
+			BPF_JMP_REG(BPF_JNE, R0, R2, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0 } },
+		.stack_depth = 8,
+	},
+	{
+		"BPF_LDX_MEMSX | BPF_W",
+		.u.insns_int = {
+			BPF_LD_IMM64(R1, 0x00000000deadbeefULL),
+			BPF_LD_IMM64(R2, 0xffffffffdeadbeefULL),
+			BPF_STX_MEM(BPF_DW, R10, R1, -8),
+#ifdef __BIG_ENDIAN
+			BPF_LDX_MEMSX(BPF_W, R0, R10, -4),
+#else
+			BPF_LDX_MEMSX(BPF_W, R0, R10, -8),
+#endif
+			BPF_JMP_REG(BPF_JNE, R0, R2, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 0 } },
+		.stack_depth = 8,
+	},
 	/* BPF_STX_MEM B/H/W/DW */
 	{
 		"BPF_STX_MEM | BPF_B",
@@ -9474,6 +9831,20 @@  static struct bpf_test tests[] = {
 		{ },
 		{ { 0, 1 } },
 	},
+	/* BPF_JMP32 | BPF_JA */
+	{
+		"JMP32_JA: Unconditional jump: if (true) return 1",
+		.u.insns_int = {
+			BPF_ALU32_IMM(BPF_MOV, R0, 0),
+			BPF_JMP32_IMM(BPF_JA, 0, 1, 0),
+			BPF_EXIT_INSN(),
+			BPF_ALU32_IMM(BPF_MOV, R0, 1),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL,
+		{ },
+		{ { 0, 1 } },
+	},
 	/* BPF_JMP | BPF_JSLT | BPF_K */
 	{
 		"JMP_JSLT_K: Signed jump: if (-2 < -1) return 1",