PPC: net: bpf_jit_comp: add XOR instruction for BPF JIT

This patch is a follow-up for patch "filter: add XOR instruction for use
with X/K" that implements BPF PowerPC JIT parts for the BPF XOR operation.

Signed-off-by: Daniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Cc: Matt Evans <matt@ozlabs.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 20 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 5f73ce63fcae..42b1f43b943b 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -168,9 +168,12 @@
 #define PPC_INST_AND                    0x7c000038
 #define PPC_INST_ANDDOT                 0x7c000039
 #define PPC_INST_OR                     0x7c000378
+#define PPC_INST_XOR                    0x7c000278
 #define PPC_INST_ANDI                   0x70000000
 #define PPC_INST_ORI                    0x60000000
 #define PPC_INST_ORIS                   0x64000000
+#define PPC_INST_XORI                   0x68000000
+#define PPC_INST_XORIS                  0x6c000000
 #define PPC_INST_NEG                    0x7c0000d0
 #define PPC_INST_BRANCH                 0x48000000
 #define PPC_INST_BRANCH_COND            0x40800000
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index 1fc8109bf2f9..8a5dfaf5c6b7 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -134,6 +134,12 @@ DECLARE_LOAD_FUNC(sk_load_byte_msh);
                                      ___PPC_RS(a) | IMM_L(i))
 #define PPC_ORIS(d, a, i)       EMIT(PPC_INST_ORIS | ___PPC_RA(d) |           \
                                      ___PPC_RS(a) | IMM_L(i))
+#define PPC_XOR(d, a, b)        EMIT(PPC_INST_XOR | ___PPC_RA(d) |            \
+                                     ___PPC_RS(a) | ___PPC_RB(b))
+#define PPC_XORI(d, a, i)       EMIT(PPC_INST_XORI | ___PPC_RA(d) |           \
+                                     ___PPC_RS(a) | IMM_L(i))
+#define PPC_XORIS(d, a, i)      EMIT(PPC_INST_XORIS | ___PPC_RA(d) |          \
+                                     ___PPC_RS(a) | IMM_L(i))
 #define PPC_SLW(d, a, s)        EMIT(PPC_INST_SLW | ___PPC_RA(d) |            \
                                      ___PPC_RS(a) | ___PPC_RB(s))
 #define PPC_SRW(d, a, s)        EMIT(PPC_INST_SRW | ___PPC_RA(d) |            \
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index dd1130642d07..b9434de8222b 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -232,6 +232,17 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
                         if (K >= 65536)
                                 PPC_ORIS(r_A, r_A, IMM_H(K));
                         break;
+                case BPF_S_ANC_ALU_XOR_X:
+                case BPF_S_ALU_XOR_X: /* A ^= X */
+                        ctx->seen |= SEEN_XREG;
+                        PPC_XOR(r_A, r_A, r_X);
+                        break;
+                case BPF_S_ALU_XOR_K: /* A ^= K */
+                        if (IMM_L(K))
+                                PPC_XORI(r_A, r_A, IMM_L(K));
+                        if (K >= 65536)
+                                PPC_XORIS(r_A, r_A, IMM_H(K));
+                        break;
                 case BPF_S_ALU_LSH_X: /* A <<= X; */
                         ctx->seen |= SEEN_XREG;
                         PPC_SLW(r_A, r_A, r_X);