[PATCH 6.9 211/374] powerpc/bpf/32: Fix failing test_bpf tests

Greg Kroah-Hartman
2024-06-06T14:10:05Z

From: Christophe Leroy <christophe.leroy@csgroup.eu>

[ Upstream commit 8ecf3c1dab1c675721d3d0255556abe2306fa340 ]

Recent additions in BPF like cpu v4 instructions, test_bpf module
exhibits the following failures:

test_bpf: #82 ALU_MOVSX | BPF_B jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
test_bpf: #83 ALU_MOVSX | BPF_H jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
test_bpf: #84 ALU64_MOVSX | BPF_B jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
test_bpf: #85 ALU64_MOVSX | BPF_H jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)
test_bpf: #86 ALU64_MOVSX | BPF_W jited:1 ret 2 != 1 (0x2 != 0x1)FAIL (1 times)

test_bpf: #165 ALU_SDIV_X: -6 / 2 = -3 jited:1 ret 2147483645 != -3 (0x7ffffffd != 0xfffffffd)FAIL (1 times)
test_bpf: #166 ALU_SDIV_K: -6 / 2 = -3 jited:1 ret 2147483645 != -3 (0x7ffffffd != 0xfffffffd)FAIL (1 times)

test_bpf: #169 ALU_SMOD_X: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)
test_bpf: #170 ALU_SMOD_K: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)

test_bpf: #172 ALU64_SMOD_K: -7 % 2 = -1 jited:1 ret 1 != -1 (0x1 != 0xffffffff)FAIL (1 times)

test_bpf: #313 BSWAP 16: 0x0123456789abcdef -> 0xefcd
eBPF filter opcode 00d7 (@2) unsupported
jited:0 301 PASS
test_bpf: #314 BSWAP 32: 0x0123456789abcdef -> 0xefcdab89
eBPF filter opcode 00d7 (@2) unsupported
jited:0 555 PASS
test_bpf: #315 BSWAP 64: 0x0123456789abcdef -> 0x67452301
eBPF filter opcode 00d7 (@2) unsupported
jited:0 268 PASS
test_bpf: #316 BSWAP 64: 0x0123456789abcdef >> 32 -> 0xefcdab89
eBPF filter opcode 00d7 (@2) unsupported
jited:0 269 PASS
test_bpf: #317 BSWAP 16: 0xfedcba9876543210 -> 0x1032
eBPF filter opcode 00d7 (@2) unsupported
jited:0 460 PASS
test_bpf: #318 BSWAP 32: 0xfedcba9876543210 -> 0x10325476
eBPF filter opcode 00d7 (@2) unsupported
jited:0 320 PASS
test_bpf: #319 BSWAP 64: 0xfedcba9876543210 -> 0x98badcfe
eBPF filter opcode 00d7 (@2) unsupported
jited:0 222 PASS
test_bpf: #320 BSWAP 64: 0xfedcba9876543210 >> 32 -> 0x10325476
eBPF filter opcode 00d7 (@2) unsupported
jited:0 273 PASS

test_bpf: #344 BPF_LDX_MEMSX | BPF_B
eBPF filter opcode 0091 (@5) unsupported
jited:0 432 PASS
test_bpf: #345 BPF_LDX_MEMSX | BPF_H
eBPF filter opcode 0089 (@5) unsupported
jited:0 381 PASS
test_bpf: #346 BPF_LDX_MEMSX | BPF_W
eBPF filter opcode 0081 (@5) unsupported
jited:0 505 PASS

test_bpf: #490 JMP32_JA: Unconditional jump: if (true) return 1
eBPF filter opcode 0006 (@1) unsupported
jited:0 261 PASS

test_bpf: Summary: 1040 PASSED, 10 FAILED, [924/1038 JIT'ed]

Fix them by adding missing processing.

Fixes: daabb2b098e0 ("bpf/tests: add tests for cpuv4 instructions")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/91de862dda99d170697eb79ffb478678af7e0b27.1709652689.git.christophe.leroy@csgroup.eu
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/include/asm/ppc-opcode.h | 4 +
arch/powerpc/net/bpf_jit_comp32.c | 137 ++++++++++++++++++++------
2 files changed, 110 insertions(+), 31 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 005601243dda4..076ae60b4a55d 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -510,6 +510,7 @@
#define PPC_RAW_STB(r, base, i) (0x98000000 | ___PPC_RS(r) | ___PPC_RA(base) | IMM_L(i))
#define PPC_RAW_LBZ(r, base, i) (0x88000000 | ___PPC_RT(r) | ___PPC_RA(base) | IMM_L(i))
#define PPC_RAW_LDX(r, base, b) (0x7c00002a | ___PPC_RT(r) | ___PPC_RA(base) | ___PPC_RB(b))
+#define PPC_RAW_LHA(r, base, i) (0xa8000000 | ___PPC_RT(r) | ___PPC_RA(base) | IMM_L(i))
#define PPC_RAW_LHZ(r, base, i) (0xa0000000 | ___PPC_RT(r) | ___PPC_RA(base) | IMM_L(i))
#define PPC_RAW_LHBRX(r, base, b) (0x7c00062c | ___PPC_RT(r) | ___PPC_RA(base) | ___PPC_RB(b))
#define PPC_RAW_LWBRX(r, base, b) (0x7c00042c | ___PPC_RT(r) | ___PPC_RA(base) | ___PPC_RB(b))
@@ -532,6 +533,7 @@
#define PPC_RAW_MULW(d, a, b) (0x7c0001d6 | ___PPC_RT(d) | ___PPC_RA(a) | ___PPC_RB(b))
#define PPC_RAW_MULHWU(d, a, b) (0x7c000016 | ___PPC_RT(d) | ___PPC_RA(a) | ___PPC_RB(b))
#define PPC_RAW_MULI(d, a, i) (0x1c000000 | ___PPC_RT(d) | ___PPC_RA(a) | IMM_L(i))
+#define PPC_RAW_DIVW(d, a, b) (0x7c0003d6 | ___PPC_RT(d) | ___PPC_RA(a) | ___PPC_RB(b))
#define PPC_RAW_DIVWU(d, a, b) (0x7c000396 | ___PPC_RT(d) | ___PPC_RA(a) | ___PPC_RB(b))
#define PPC_RAW_DIVDU(d, a, b) (0x7c000392 | ___PPC_RT(d) | ___PPC_RA(a) | ___PPC_RB(b))
#define PPC_RAW_DIVDE(t, a, b) (0x7c000352 | ___PPC_RT(t) | ___PPC_RA(a) | ___PPC_RB(b))
@@ -550,6 +552,8 @@
#define PPC_RAW_XOR(d, a, b) (0x7c000278 | ___PPC_RA(d) | ___PPC_RS(a) | ___PPC_RB(b))
#define PPC_RAW_XORI(d, a, i) (0x68000000 | ___PPC_RA(d) | ___PPC_RS(a) | IMM_L(i))
#define PPC_RAW_XORIS(d, a, i) (0x6c000000 | ___PPC_RA(d) | ___PPC_RS(a) | IMM_L(i))
+#define PPC_RAW_EXTSB(d, a) (0x7c000774 | ___PPC_RA(d) | ___PPC_RS(a))
+#define PPC_RAW_EXTSH(d, a) (0x7c000734 | ___PPC_RA(d) | ___PPC_RS(a))
#define PPC_RAW_EXTSW(d, a) (0x7c0007b4 | ___PPC_RA(d) | ___PPC_RS(a))
#define PPC_RAW_SLW(d, a, s) (0x7c000030 | ___PPC_RA(d) | ___PPC_RS(a) | ___PPC_RB(s))
#define PPC_RAW_SLD(d, a, s) (0x7c000036 | ___PPC_RA(d) | ___PPC_RS(a) | ___PPC_RB(s))
diff --git a/arch/powerpc/net/bpf_jit_comp32.c b/arch/powerpc/net/bpf_jit_comp32.c
index 2f39c50ca729e..43b97032a91c0 100644
--- a/arch/powerpc/net/bpf_jit_comp32.c
+++ b/arch/powerpc/net/bpf_jit_comp32.c
@@ -450,10 +450,16 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
}
break;
case BPF_ALU | BPF_DIV | BPF_X: /* (u32) dst /= (u32) src */
- EMIT(PPC_RAW_DIVWU(dst_reg, src2_reg, src_reg));
+ if (off)
+ EMIT(PPC_RAW_DIVW(dst_reg, src2_reg, src_reg));
+ else
+ EMIT(PPC_RAW_DIVWU(dst_reg, src2_reg, src_reg));
break;
case BPF_ALU | BPF_MOD | BPF_X: /* (u32) dst %= (u32) src */
- EMIT(PPC_RAW_DIVWU(_R0, src2_reg, src_reg));
+ if (off)
+ EMIT(PPC_RAW_DIVW(_R0, src2_reg, src_reg));
+ else
+ EMIT(PPC_RAW_DIVWU(_R0, src2_reg, src_reg));
EMIT(PPC_RAW_MULW(_R0, src_reg, _R0));
EMIT(PPC_RAW_SUB(dst_reg, src2_reg, _R0));
break;
@@ -467,10 +473,16 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
if (imm == 1) {
EMIT(PPC_RAW_MR(dst_reg, src2_reg));
} else if (is_power_of_2((u32)imm)) {
- EMIT(PPC_RAW_SRWI(dst_reg, src2_reg, ilog2(imm)));
+ if (off)
+ EMIT(PPC_RAW_SRAWI(dst_reg, src2_reg, ilog2(imm)));
+ else
+ EMIT(PPC_RAW_SRWI(dst_reg, src2_reg, ilog2(imm)));
} else {
PPC_LI32(_R0, imm);
- EMIT(PPC_RAW_DIVWU(dst_reg, src2_reg, _R0));
+ if (off)
+ EMIT(PPC_RAW_DIVW(dst_reg, src2_reg, _R0));
+ else
+ EMIT(PPC_RAW_DIVWU(dst_reg, src2_reg, _R0));
}
break;
case BPF_ALU | BPF_MOD | BPF_K: /* (u32) dst %= (u32) imm */
@@ -480,11 +492,19 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
if (!is_power_of_2((u32)imm)) {
bpf_set_seen_register(ctx, tmp_reg);
PPC_LI32(tmp_reg, imm);
- EMIT(PPC_RAW_DIVWU(_R0, src2_reg, tmp_reg));
+ if (off)
+ EMIT(PPC_RAW_DIVW(_R0, src2_reg, tmp_reg));
+ else
+ EMIT(PPC_RAW_DIVWU(_R0, src2_reg, tmp_reg));
EMIT(PPC_RAW_MULW(_R0, tmp_reg, _R0));
EMIT(PPC_RAW_SUB(dst_reg, src2_reg, _R0));
} else if (imm == 1) {
EMIT(PPC_RAW_LI(dst_reg, 0));
+ } else if (off) {
+ EMIT(PPC_RAW_SRAWI(_R0, src2_reg, ilog2(imm)));
+ EMIT(PPC_RAW_ADDZE(_R0, _R0));
+ EMIT(PPC_RAW_SLWI(_R0, _R0, ilog2(imm)));
+ EMIT(PPC_RAW_SUB(dst_reg, src2_reg, _R0));
} else {
imm = ilog2((u32)imm);
EMIT(PPC_RAW_RLWINM(dst_reg, src2_reg, 0, 32 - imm, 31));
@@ -497,11 +517,21 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
imm = -imm;
if (!is_power_of_2(imm))
return -EOPNOTSUPP;
- if (imm == 1)
+ if (imm == 1) {
EMIT(PPC_RAW_LI(dst_reg, 0));
- else
+ EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ } else if (off) {
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, src2_reg_h, 31));
+ EMIT(PPC_RAW_XOR(dst_reg, src2_reg, dst_reg_h));
+ EMIT(PPC_RAW_SUBFC(dst_reg, dst_reg_h, dst_reg));
+ EMIT(PPC_RAW_RLWINM(dst_reg, dst_reg, 0, 32 - ilog2(imm), 31));
+ EMIT(PPC_RAW_XOR(dst_reg, dst_reg, dst_reg_h));
+ EMIT(PPC_RAW_SUBFC(dst_reg, dst_reg_h, dst_reg));
+ EMIT(PPC_RAW_SUBFE(dst_reg_h, dst_reg_h, dst_reg_h));
+ } else {
EMIT(PPC_RAW_RLWINM(dst_reg, src2_reg, 0, 32 - ilog2(imm), 31));
- EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ }
break;
case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */
if (!imm)
@@ -727,15 +757,30 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
* MOV
*/
case BPF_ALU64 | BPF_MOV | BPF_X: /* dst = src */
- if (dst_reg == src_reg)
- break;
- EMIT(PPC_RAW_MR(dst_reg, src_reg));
- EMIT(PPC_RAW_MR(dst_reg_h, src_reg_h));
+ if (off == 8) {
+ EMIT(PPC_RAW_EXTSB(dst_reg, src_reg));
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, dst_reg, 31));
+ } else if (off == 16) {
+ EMIT(PPC_RAW_EXTSH(dst_reg, src_reg));
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, dst_reg, 31));
+ } else if (off == 32 && dst_reg == src_reg) {
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, src_reg, 31));
+ } else if (off == 32) {
+ EMIT(PPC_RAW_MR(dst_reg, src_reg));
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, src_reg, 31));
+ } else if (dst_reg != src_reg) {
+ EMIT(PPC_RAW_MR(dst_reg, src_reg));
+ EMIT(PPC_RAW_MR(dst_reg_h, src_reg_h));
+ }
break;
case BPF_ALU | BPF_MOV | BPF_X: /* (u32) dst = src */
/* special mov32 for zext */
if (imm == 1)
EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ else if (off == 8)
+ EMIT(PPC_RAW_EXTSB(dst_reg, src_reg));
+ else if (off == 16)
+ EMIT(PPC_RAW_EXTSH(dst_reg, src_reg));
else if (dst_reg != src_reg)
EMIT(PPC_RAW_MR(dst_reg, src_reg));
break;
@@ -751,6 +796,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
* BPF_FROM_BE/LE
*/
case BPF_ALU | BPF_END | BPF_FROM_LE:
+ case BPF_ALU64 | BPF_END | BPF_FROM_LE:
switch (imm) {
case 16:
/* Copy 16 bits to upper part */
@@ -785,6 +831,8 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
EMIT(PPC_RAW_MR(dst_reg_h, tmp_reg));
break;
}
+ if (BPF_CLASS(code) == BPF_ALU64 && imm != 64)
+ EMIT(PPC_RAW_LI(dst_reg_h, 0));
break;
case BPF_ALU | BPF_END | BPF_FROM_BE:
switch (imm) {
@@ -918,11 +966,17 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
* BPF_LDX
*/
case BPF_LDX | BPF_MEM | BPF_B: /* dst = *(u8 *)(ul) (src + off) */
+ case BPF_LDX | BPF_MEMSX | BPF_B:
case BPF_LDX | BPF_PROBE_MEM | BPF_B:
+ case BPF_LDX | BPF_PROBE_MEMSX | BPF_B:
case BPF_LDX | BPF_MEM | BPF_H: /* dst = *(u16 *)(ul) (src + off) */
+ case BPF_LDX | BPF_MEMSX | BPF_H:
case BPF_LDX | BPF_PROBE_MEM | BPF_H:
+ case BPF_LDX | BPF_PROBE_MEMSX | BPF_H:
case BPF_LDX | BPF_MEM | BPF_W: /* dst = *(u32 *)(ul) (src + off) */
+ case BPF_LDX | BPF_MEMSX | BPF_W:
case BPF_LDX | BPF_PROBE_MEM | BPF_W:
+ case BPF_LDX | BPF_PROBE_MEMSX | BPF_W:
case BPF_LDX | BPF_MEM | BPF_DW: /* dst = *(u64 *)(ul) (src + off) */
case BPF_LDX | BPF_PROBE_MEM | BPF_DW:
/*
@@ -931,7 +985,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
* load only if addr is kernel address (see is_kernel_addr()), otherwise
* set dst_reg=0 and move on.
*/
- if (BPF_MODE(code) == BPF_PROBE_MEM) {
+ if (BPF_MODE(code) == BPF_PROBE_MEM || BPF_MODE(code) == BPF_PROBE_MEMSX) {
PPC_LI32(_R0, TASK_SIZE - off);
EMIT(PPC_RAW_CMPLW(src_reg, _R0));
PPC_BCC_SHORT(COND_GT, (ctx->idx + 4) * 4);
@@ -953,30 +1007,48 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
* as there are two load instructions for dst_reg_h & dst_reg
* respectively.
*/
- if (size == BPF_DW)
+ if (size == BPF_DW ||
+ (size == BPF_B && BPF_MODE(code) == BPF_PROBE_MEMSX))
PPC_JMP((ctx->idx + 3) * 4);
else
PPC_JMP((ctx->idx + 2) * 4);
}

- switch (size) {
- case BPF_B:
- EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
- break;
- case BPF_H:
- EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
- break;
- case BPF_W:
- EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
- break;
- case BPF_DW:
- EMIT(PPC_RAW_LWZ(dst_reg_h, src_reg, off));
- EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off + 4));
- break;
- }
+ if (BPF_MODE(code) == BPF_MEMSX || BPF_MODE(code) == BPF_PROBE_MEMSX) {
+ switch (size) {
+ case BPF_B:
+ EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
+ EMIT(PPC_RAW_EXTSB(dst_reg, dst_reg));
+ break;
+ case BPF_H:
+ EMIT(PPC_RAW_LHA(dst_reg, src_reg, off));
+ break;
+ case BPF_W:
+ EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
+ break;
+ }
+ if (!fp->aux->verifier_zext)
+ EMIT(PPC_RAW_SRAWI(dst_reg_h, dst_reg, 31));

- if (size != BPF_DW && !fp->aux->verifier_zext)
- EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ } else {
+ switch (size) {
+ case BPF_B:
+ EMIT(PPC_RAW_LBZ(dst_reg, src_reg, off));
+ break;
+ case BPF_H:
+ EMIT(PPC_RAW_LHZ(dst_reg, src_reg, off));
+ break;
+ case BPF_W:
+ EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off));
+ break;
+ case BPF_DW:
+ EMIT(PPC_RAW_LWZ(dst_reg_h, src_reg, off));
+ EMIT(PPC_RAW_LWZ(dst_reg, src_reg, off + 4));
+ break;
+ }
+ if (size != BPF_DW && !fp->aux->verifier_zext)
+ EMIT(PPC_RAW_LI(dst_reg_h, 0));
+ }

if (BPF_MODE(code) == BPF_PROBE_MEM) {
int insn_idx = ctx->idx - 1;
@@ -1068,6 +1140,9 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct code
case BPF_JMP | BPF_JA:
PPC_JMP(addrs[i + 1 + off]);
break;
+ case BPF_JMP32 | BPF_JA:
+ PPC_JMP(addrs[i + 1 + imm]);
+ break;

case BPF_JMP | BPF_JGT | BPF_K:
case BPF_JMP | BPF_JGT | BPF_X:
--
2.43.0