ARM: 7421/1: bpf_jit: BPF_S_ANC_ALU_XOR_X support

JIT support for the XOR operation introduced by the commit
ffe06c17af.

Signed-off-by: Mircea Gherzan <mgherzan@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/net/bpf_jit_32.c

@@ -762,6 +762,11 @@ b_epilogue:
 			update_on_xread(ctx);
 			emit(ARM_MOV_R(r_A, r_X), ctx);
 			break;
+		case BPF_S_ANC_ALU_XOR_X:
+			/* A ^= X */
+			update_on_xread(ctx);
+			emit(ARM_EOR_R(r_A, r_A, r_X), ctx);
+			break;
 		case BPF_S_ANC_PROTOCOL:
 			/* A = ntohs(skb->protocol) */
 			ctx->seen |= SEEN_SKB;

arch/arm/net/bpf_jit_32.h

@@ -68,6 +68,8 @@
 #define ARM_INST_CMP_R		0x01500000
 #define ARM_INST_CMP_I		0x03500000
 
+#define ARM_INST_EOR_R		0x00200000
+
 #define ARM_INST_LDRB_I		0x05d00000
 #define ARM_INST_LDRB_R		0x07d00000
 #define ARM_INST_LDRH_I		0x01d000b0
@@ -132,6 +134,8 @@
 #define ARM_CMP_R(rn, rm)	_AL3_R(ARM_INST_CMP, 0, rn, rm)
 #define ARM_CMP_I(rn, imm)	_AL3_I(ARM_INST_CMP, 0, rn, imm)
 
+#define ARM_EOR_R(rd, rn, rm)	_AL3_R(ARM_INST_EOR, rd, rn, rm)
+
 #define ARM_LDR_I(rt, rn, off)	(ARM_INST_LDR_I | (rt) << 12 | (rn) << 16 \
 				 | (off))
 #define ARM_LDRB_I(rt, rn, off)	(ARM_INST_LDRB_I | (rt) << 12 | (rn) << 16 \