ARM: net: bpf: 64-bit accessor functions for BPF registers

Provide a couple of 64-bit register accessors, and use them where
appropriate

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 08fb4eb..45a3599 100644 (file)
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -478,6 +478,17 @@ static s8 arm_bpf_get_reg32(s8 reg, s8 tmp, struct jit_ctx *ctx)
        return reg;
 }
 
+static const s8 *arm_bpf_get_reg64(const s8 *reg, const s8 *tmp,
+                                  struct jit_ctx *ctx)
+{
+       if (is_stacked(reg[1])) {
+               emit(ARM_LDR_I(tmp[1], ARM_SP, STACK_VAR(reg[1])), ctx);
+               emit(ARM_LDR_I(tmp[0], ARM_SP, STACK_VAR(reg[0])), ctx);
+               reg = tmp;
+       }
+       return reg;
+}
+
 /* If a BPF register is on the stack (stk is true), save the register
  * back to the stack.  If the source register is not the same, then
  * move it into the correct register.
@@ -490,6 +501,20 @@ static void arm_bpf_put_reg32(s8 reg, s8 src, struct jit_ctx *ctx)
                emit(ARM_MOV_R(reg, src), ctx);
 }
 
+static void arm_bpf_put_reg64(const s8 *reg, const s8 *src,
+                             struct jit_ctx *ctx)
+{
+       if (is_stacked(reg[1])) {
+               emit(ARM_STR_I(src[1], ARM_SP, STACK_VAR(reg[1])), ctx);
+               emit(ARM_STR_I(src[0], ARM_SP, STACK_VAR(reg[0])), ctx);
+       } else {
+               if (reg[1] != src[1])
+                       emit(ARM_MOV_R(reg[1], src[1]), ctx);
+               if (reg[0] != src[0])
+                       emit(ARM_MOV_R(reg[0], src[0]), ctx);
+       }
+}
+
 static inline void emit_a32_mov_i(const s8 dst, const u32 val,
                                  struct jit_ctx *ctx)
 {
@@ -669,18 +694,16 @@ static inline void emit_a32_alu_i(const s8 dst, const u32 val,
 static inline void emit_a32_neg64(const s8 dst[],
                                struct jit_ctx *ctx){
        const s8 *tmp = bpf2a32[TMP_REG_1];
-       s8 rd, rm;
+       const s8 *rd;
 
        /* Setup Operand */
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do Negate Operation */
-       emit(ARM_RSBS_I(rd, rd, 0), ctx);
-       emit(ARM_RSC_I(rm, rm, 0), ctx);
+       emit(ARM_RSBS_I(rd[1], rd[1], 0), ctx);
+       emit(ARM_RSC_I(rd[0], rd[0], 0), ctx);
 
-       arm_bpf_put_reg32(dst_lo, rd, ctx);
-       arm_bpf_put_reg32(dst_hi, rm, ctx);
+       arm_bpf_put_reg64(dst, rd, ctx);
 }
 
 /* dst = dst << src */
@@ -688,20 +711,20 @@ static inline void emit_a32_lsh_r64(const s8 dst[], const s8 src[],
                                    struct jit_ctx *ctx) {
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rt, rd, rm;
+       const s8 *rd;
+       s8 rt;
 
        /* Setup Operands */
        rt = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do LSH operation */
        emit(ARM_SUB_I(ARM_IP, rt, 32), ctx);
        emit(ARM_RSB_I(tmp2[0], rt, 32), ctx);
-       emit(ARM_MOV_SR(ARM_LR, rm, SRTYPE_ASL, rt), ctx);
-       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd, SRTYPE_ASL, ARM_IP), ctx);
-       emit(ARM_ORR_SR(ARM_IP, ARM_LR, rd, SRTYPE_LSR, tmp2[0]), ctx);
-       emit(ARM_MOV_SR(ARM_LR, rd, SRTYPE_ASL, rt), ctx);
+       emit(ARM_MOV_SR(ARM_LR, rd[0], SRTYPE_ASL, rt), ctx);
+       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd[1], SRTYPE_ASL, ARM_IP), ctx);
+       emit(ARM_ORR_SR(ARM_IP, ARM_LR, rd[1], SRTYPE_LSR, tmp2[0]), ctx);
+       emit(ARM_MOV_SR(ARM_LR, rd[1], SRTYPE_ASL, rt), ctx);
 
        arm_bpf_put_reg32(dst_lo, ARM_LR, ctx);
        arm_bpf_put_reg32(dst_hi, ARM_IP, ctx);
@@ -712,21 +735,21 @@ static inline void emit_a32_arsh_r64(const s8 dst[], const s8 src[],
                                     struct jit_ctx *ctx) {
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rt, rd, rm;
+       const s8 *rd;
+       s8 rt;
 
        /* Setup Operands */
        rt = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do the ARSH operation */
        emit(ARM_RSB_I(ARM_IP, rt, 32), ctx);
        emit(ARM_SUBS_I(tmp2[0], rt, 32), ctx);
-       emit(ARM_MOV_SR(ARM_LR, rd, SRTYPE_LSR, rt), ctx);
-       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rm, SRTYPE_ASL, ARM_IP), ctx);
+       emit(ARM_MOV_SR(ARM_LR, rd[1], SRTYPE_LSR, rt), ctx);
+       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd[0], SRTYPE_ASL, ARM_IP), ctx);
        _emit(ARM_COND_MI, ARM_B(0), ctx);
-       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rm, SRTYPE_ASR, tmp2[0]), ctx);
-       emit(ARM_MOV_SR(ARM_IP, rm, SRTYPE_ASR, rt), ctx);
+       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd[0], SRTYPE_ASR, tmp2[0]), ctx);
+       emit(ARM_MOV_SR(ARM_IP, rd[0], SRTYPE_ASR, rt), ctx);
 
        arm_bpf_put_reg32(dst_lo, ARM_LR, ctx);
        arm_bpf_put_reg32(dst_hi, ARM_IP, ctx);
@@ -737,20 +760,20 @@ static inline void emit_a32_rsh_r64(const s8 dst[], const s8 src[],
                                    struct jit_ctx *ctx) {
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rt, rd, rm;
+       const s8 *rd;
+       s8 rt;
 
        /* Setup Operands */
        rt = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do RSH operation */
        emit(ARM_RSB_I(ARM_IP, rt, 32), ctx);
        emit(ARM_SUBS_I(tmp2[0], rt, 32), ctx);
-       emit(ARM_MOV_SR(ARM_LR, rd, SRTYPE_LSR, rt), ctx);
-       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rm, SRTYPE_ASL, ARM_IP), ctx);
-       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rm, SRTYPE_LSR, tmp2[0]), ctx);
-       emit(ARM_MOV_SR(ARM_IP, rm, SRTYPE_LSR, rt), ctx);
+       emit(ARM_MOV_SR(ARM_LR, rd[1], SRTYPE_LSR, rt), ctx);
+       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd[0], SRTYPE_ASL, ARM_IP), ctx);
+       emit(ARM_ORR_SR(ARM_LR, ARM_LR, rd[0], SRTYPE_LSR, tmp2[0]), ctx);
+       emit(ARM_MOV_SR(ARM_IP, rd[0], SRTYPE_LSR, rt), ctx);
 
        arm_bpf_put_reg32(dst_lo, ARM_LR, ctx);
        arm_bpf_put_reg32(dst_hi, ARM_IP, ctx);
@@ -761,27 +784,25 @@ static inline void emit_a32_lsh_i64(const s8 dst[],
                                    const u32 val, struct jit_ctx *ctx){
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rd, rm;
+       const s8 *rd;
 
        /* Setup operands */
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do LSH operation */
        if (val < 32) {
-               emit(ARM_MOV_SI(tmp2[0], rm, SRTYPE_ASL, val), ctx);
-               emit(ARM_ORR_SI(rm, tmp2[0], rd, SRTYPE_LSR, 32 - val), ctx);
-               emit(ARM_MOV_SI(rd, rd, SRTYPE_ASL, val), ctx);
+               emit(ARM_MOV_SI(tmp2[0], rd[0], SRTYPE_ASL, val), ctx);
+               emit(ARM_ORR_SI(rd[0], tmp2[0], rd[1], SRTYPE_LSR, 32 - val), ctx);
+               emit(ARM_MOV_SI(rd[1], rd[1], SRTYPE_ASL, val), ctx);
        } else {
                if (val == 32)
-                       emit(ARM_MOV_R(rm, rd), ctx);
+                       emit(ARM_MOV_R(rd[0], rd[1]), ctx);
                else
-                       emit(ARM_MOV_SI(rm, rd, SRTYPE_ASL, val - 32), ctx);
-               emit(ARM_EOR_R(rd, rd, rd), ctx);
+                       emit(ARM_MOV_SI(rd[0], rd[1], SRTYPE_ASL, val - 32), ctx);
+               emit(ARM_EOR_R(rd[1], rd[1], rd[1]), ctx);
        }
 
-       arm_bpf_put_reg32(dst_lo, rd, ctx);
-       arm_bpf_put_reg32(dst_hi, rm, ctx);
+       arm_bpf_put_reg64(dst, rd, ctx);
 }
 
 /* dst = dst >> val */
@@ -789,27 +810,25 @@ static inline void emit_a32_rsh_i64(const s8 dst[],
                                    const u32 val, struct jit_ctx *ctx) {
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rd, rm;
+       const s8 *rd;
 
        /* Setup operands */
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do LSR operation */
        if (val < 32) {
-               emit(ARM_MOV_SI(tmp2[1], rd, SRTYPE_LSR, val), ctx);
-               emit(ARM_ORR_SI(rd, tmp2[1], rm, SRTYPE_ASL, 32 - val), ctx);
-               emit(ARM_MOV_SI(rm, rm, SRTYPE_LSR, val), ctx);
+               emit(ARM_MOV_SI(tmp2[1], rd[1], SRTYPE_LSR, val), ctx);
+               emit(ARM_ORR_SI(rd[1], tmp2[1], rd[0], SRTYPE_ASL, 32 - val), ctx);
+               emit(ARM_MOV_SI(rd[0], rd[0], SRTYPE_LSR, val), ctx);
        } else if (val == 32) {
-               emit(ARM_MOV_R(rd, rm), ctx);
-               emit(ARM_MOV_I(rm, 0), ctx);
+               emit(ARM_MOV_R(rd[1], rd[0]), ctx);
+               emit(ARM_MOV_I(rd[0], 0), ctx);
        } else {
-               emit(ARM_MOV_SI(rd, rm, SRTYPE_LSR, val - 32), ctx);
-               emit(ARM_MOV_I(rm, 0), ctx);
+               emit(ARM_MOV_SI(rd[1], rd[0], SRTYPE_LSR, val - 32), ctx);
+               emit(ARM_MOV_I(rd[0], 0), ctx);
        }
 
-       arm_bpf_put_reg32(dst_lo, rd, ctx);
-       arm_bpf_put_reg32(dst_hi, rm, ctx);
+       arm_bpf_put_reg64(dst, rd, ctx);
 }
 
 /* dst = dst >> val (signed) */
@@ -817,51 +836,47 @@ static inline void emit_a32_arsh_i64(const s8 dst[],
                                     const u32 val, struct jit_ctx *ctx){
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rd, rm;
+       const s8 *rd;
 
        /* Setup operands */
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
        /* Do ARSH operation */
        if (val < 32) {
-               emit(ARM_MOV_SI(tmp2[1], rd, SRTYPE_LSR, val), ctx);
-               emit(ARM_ORR_SI(rd, tmp2[1], rm, SRTYPE_ASL, 32 - val), ctx);
-               emit(ARM_MOV_SI(rm, rm, SRTYPE_ASR, val), ctx);
+               emit(ARM_MOV_SI(tmp2[1], rd[1], SRTYPE_LSR, val), ctx);
+               emit(ARM_ORR_SI(rd[1], tmp2[1], rd[0], SRTYPE_ASL, 32 - val), ctx);
+               emit(ARM_MOV_SI(rd[0], rd[0], SRTYPE_ASR, val), ctx);
        } else if (val == 32) {
-               emit(ARM_MOV_R(rd, rm), ctx);
-               emit(ARM_MOV_SI(rm, rm, SRTYPE_ASR, 31), ctx);
+               emit(ARM_MOV_R(rd[1], rd[0]), ctx);
+               emit(ARM_MOV_SI(rd[0], rd[0], SRTYPE_ASR, 31), ctx);
        } else {
-               emit(ARM_MOV_SI(rd, rm, SRTYPE_ASR, val - 32), ctx);
-               emit(ARM_MOV_SI(rm, rm, SRTYPE_ASR, 31), ctx);
+               emit(ARM_MOV_SI(rd[1], rd[0], SRTYPE_ASR, val - 32), ctx);
+               emit(ARM_MOV_SI(rd[0], rd[0], SRTYPE_ASR, 31), ctx);
        }
 
-       arm_bpf_put_reg32(dst_lo, rd, ctx);
-       arm_bpf_put_reg32(dst_hi, rm, ctx);
+       arm_bpf_put_reg64(dst, rd, ctx);
 }
 
 static inline void emit_a32_mul_r64(const s8 dst[], const s8 src[],
                                    struct jit_ctx *ctx) {
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
-       s8 rd, rm, rt, rn;
+       const s8 *rd, *rt;
 
        /* Setup operands for multiplication */
-       rd = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-       rm = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
-       rt = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
-       rn = arm_bpf_get_reg32(src_hi, tmp2[0], ctx);
+       rd = arm_bpf_get_reg64(dst, tmp, ctx);
+       rt = arm_bpf_get_reg64(src, tmp2, ctx);
 
        /* Do Multiplication */
-       emit(ARM_MUL(ARM_IP, rd, rn), ctx);
-       emit(ARM_MUL(ARM_LR, rm, rt), ctx);
+       emit(ARM_MUL(ARM_IP, rd[1], rt[0]), ctx);
+       emit(ARM_MUL(ARM_LR, rd[0], rt[1]), ctx);
        emit(ARM_ADD_R(ARM_LR, ARM_IP, ARM_LR), ctx);
 
-       emit(ARM_UMULL(ARM_IP, rm, rd, rt), ctx);
-       emit(ARM_ADD_R(rm, ARM_LR, rm), ctx);
+       emit(ARM_UMULL(ARM_IP, rd[0], rd[1], rt[1]), ctx);
+       emit(ARM_ADD_R(rd[0], ARM_LR, rd[0]), ctx);
 
        arm_bpf_put_reg32(dst_lo, ARM_IP, ctx);
-       arm_bpf_put_reg32(dst_hi, rm, ctx);
+       arm_bpf_put_reg32(dst_hi, rd[0], ctx);
 }
 
 /* *(size *)(dst + off) = src */
@@ -918,17 +933,17 @@ static inline void emit_ldx_r(const s8 dst[], const s8 src,
        case BPF_B:
                /* Load a Byte */
                emit(ARM_LDRB_I(rd[1], rm, off), ctx);
-               emit_a32_mov_i(dst[0], 0, ctx);
+               emit_a32_mov_i(rd[0], 0, ctx);
                break;
        case BPF_H:
                /* Load a HalfWord */
                emit(ARM_LDRH_I(rd[1], rm, off), ctx);
-               emit_a32_mov_i(dst[0], 0, ctx);
+               emit_a32_mov_i(rd[0], 0, ctx);
                break;
        case BPF_W:
                /* Load a Word */
                emit(ARM_LDR_I(rd[1], rm, off), ctx);
-               emit_a32_mov_i(dst[0], 0, ctx);
+               emit_a32_mov_i(rd[0], 0, ctx);
                break;
        case BPF_DW:
                /* Load a Double Word */
@@ -936,9 +951,7 @@ static inline void emit_ldx_r(const s8 dst[], const s8 src,
                emit(ARM_LDR_I(rd[0], rm, off + 4), ctx);
                break;
        }
-       arm_bpf_put_reg32(dst[1], rd[1], ctx);
-       if (sz == BPF_DW)
-               arm_bpf_put_reg32(dst[0], rd[0], ctx);
+       arm_bpf_put_reg64(dst, rd, ctx);
 }
 
 /* Arithmatic Operation */
@@ -982,11 +995,12 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
        const s8 *tmp = bpf2a32[TMP_REG_1];
        const s8 *tmp2 = bpf2a32[TMP_REG_2];
        const s8 *tcc = bpf2a32[TCALL_CNT];
+       const s8 *tc;
        const int idx0 = ctx->idx;
 #define cur_offset (ctx->idx - idx0)
 #define jmp_offset (out_offset - (cur_offset) - 2)
        u32 off, lo, hi;
-       s8 r_array, r_index, r_tc_lo, r_tc_hi;
+       s8 r_array, r_index;
 
        /* if (index >= array->map.max_entries)
         *      goto out;
@@ -1008,15 +1022,13 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
         */
        lo = (u32)MAX_TAIL_CALL_CNT;
        hi = (u32)((u64)MAX_TAIL_CALL_CNT >> 32);
-       r_tc_lo = arm_bpf_get_reg32(tcc[1], tmp[1], ctx);
-       r_tc_hi = arm_bpf_get_reg32(tcc[0], tmp[0], ctx);
-       emit(ARM_CMP_I(r_tc_hi, hi), ctx);
-       _emit(ARM_COND_EQ, ARM_CMP_I(r_tc_lo, lo), ctx);
+       tc = arm_bpf_get_reg64(tcc, tmp, ctx);
+       emit(ARM_CMP_I(tc[0], hi), ctx);
+       _emit(ARM_COND_EQ, ARM_CMP_I(tc[1], lo), ctx);
        _emit(ARM_COND_HI, ARM_B(jmp_offset), ctx);
-       emit(ARM_ADDS_I(r_tc_lo, r_tc_lo, 1), ctx);
-       emit(ARM_ADC_I(r_tc_hi, r_tc_hi, 0), ctx);
-       arm_bpf_put_reg32(tcc[1], r_tc_lo, ctx);
-       arm_bpf_put_reg32(tcc[0], r_tc_hi, ctx);
+       emit(ARM_ADDS_I(tc[1], tc[1], 1), ctx);
+       emit(ARM_ADC_I(tc[0], tc[0], 0), ctx);
+       arm_bpf_put_reg64(tcc, tmp, ctx);
 
        /* prog = array->ptrs[index]
         * if (prog == NULL)
@@ -1183,7 +1195,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
        const s32 imm = insn->imm;
        const int i = insn - ctx->prog->insnsi;
        const bool is64 = BPF_CLASS(code) == BPF_ALU64;
-       s8 rd, rt, rm, rn;
+       const s8 *rd, *rs;
+       s8 rd_lo, rt, rm, rn;
        s32 jmp_offset;
 
 #define check_imm(bits, imm) do {                              \
@@ -1270,7 +1283,7 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
        case BPF_ALU | BPF_DIV | BPF_X:
        case BPF_ALU | BPF_MOD | BPF_K:
        case BPF_ALU | BPF_MOD | BPF_X:
-               rd = arm_bpf_get_reg32(dst_lo, tmp2[1], ctx);
+               rd_lo = arm_bpf_get_reg32(dst_lo, tmp2[1], ctx);
                switch (BPF_SRC(code)) {
                case BPF_X:
                        rt = arm_bpf_get_reg32(src_lo, tmp2[0], ctx);
@@ -1283,8 +1296,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
                        rt = src_lo;
                        break;
                }
-               emit_udivmod(rd, rd, rt, ctx, BPF_OP(code));
-               arm_bpf_put_reg32(dst_lo, rd, ctx);
+               emit_udivmod(rd_lo, rd_lo, rt, ctx, BPF_OP(code));
+               arm_bpf_put_reg32(dst_lo, rd_lo, ctx);
                emit_a32_mov_i(dst_hi, 0, ctx);
                break;
        case BPF_ALU64 | BPF_DIV | BPF_K:
@@ -1364,21 +1377,20 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
        /* dst = htobe(dst) */
        case BPF_ALU | BPF_END | BPF_FROM_LE:
        case BPF_ALU | BPF_END | BPF_FROM_BE:
-               rt = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-               rd = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+               rd = arm_bpf_get_reg64(dst, tmp, ctx);
                if (BPF_SRC(code) == BPF_FROM_LE)
                        goto emit_bswap_uxt;
                switch (imm) {
                case 16:
-                       emit_rev16(rt, rt, ctx);
+                       emit_rev16(rd[1], rd[1], ctx);
                        goto emit_bswap_uxt;
                case 32:
-                       emit_rev32(rt, rt, ctx);
+                       emit_rev32(rd[1], rd[1], ctx);
                        goto emit_bswap_uxt;
                case 64:
-                       emit_rev32(ARM_LR, rt, ctx);
-                       emit_rev32(rt, rd, ctx);
-                       emit(ARM_MOV_R(rd, ARM_LR), ctx);
+                       emit_rev32(ARM_LR, rd[1], ctx);
+                       emit_rev32(rd[1], rd[0], ctx);
+                       emit(ARM_MOV_R(rd[0], ARM_LR), ctx);
                        break;
                }
                goto exit;
@@ -1388,23 +1400,22 @@ emit_bswap_uxt:
                        /* zero-extend 16 bits into 64 bits */
 #if __LINUX_ARM_ARCH__ < 6
                        emit_a32_mov_i(tmp2[1], 0xffff, ctx);
-                       emit(ARM_AND_R(rt, rt, tmp2[1]), ctx);
+                       emit(ARM_AND_R(rd[1], rd[1], tmp2[1]), ctx);
 #else /* ARMv6+ */
-                       emit(ARM_UXTH(rt, rt), ctx);
+                       emit(ARM_UXTH(rd[1], rd[1]), ctx);
 #endif
-                       emit(ARM_EOR_R(rd, rd, rd), ctx);
+                       emit(ARM_EOR_R(rd[0], rd[0], rd[0]), ctx);
                        break;
                case 32:
                        /* zero-extend 32 bits into 64 bits */
-                       emit(ARM_EOR_R(rd, rd, rd), ctx);
+                       emit(ARM_EOR_R(rd[0], rd[0], rd[0]), ctx);
                        break;
                case 64:
                        /* nop */
                        break;
                }
 exit:
-               arm_bpf_put_reg32(dst_lo, rt, ctx);
-               arm_bpf_put_reg32(dst_hi, rd, ctx);
+               arm_bpf_put_reg64(dst, rd, ctx);
                break;
        /* dst = imm64 */
        case BPF_LD | BPF_IMM | BPF_DW:
@@ -1459,15 +1470,14 @@ exit:
        {
                u8 sz = BPF_SIZE(code);
 
-               rn = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
-               rm = arm_bpf_get_reg32(src_hi, tmp2[0], ctx);
+               rs = arm_bpf_get_reg64(src, tmp2, ctx);
 
                /* Store the value */
                if (BPF_SIZE(code) == BPF_DW) {
-                       emit_str_r(dst_lo, rn, off, ctx, BPF_W);
-                       emit_str_r(dst_lo, rm, off+4, ctx, BPF_W);
+                       emit_str_r(dst_lo, rs[1], off, ctx, BPF_W);
+                       emit_str_r(dst_lo, rs[0], off+4, ctx, BPF_W);
                } else {
-                       emit_str_r(dst_lo, rn, off, ctx, sz);
+                       emit_str_r(dst_lo, rs[1], off, ctx, sz);
                }
                break;
        }
@@ -1527,11 +1537,10 @@ exit:
                emit_a32_mov_i64(true, tmp2, imm, ctx);
 go_jmp:
                /* Setup destination register */
-               rt = arm_bpf_get_reg32(dst_lo, tmp[1], ctx);
-               rd = arm_bpf_get_reg32(dst_hi, tmp[0], ctx);
+               rd = arm_bpf_get_reg64(dst, tmp, ctx);
 
                /* Check for the condition */
-               emit_ar_r(rd, rt, rm, rn, ctx, BPF_OP(code));
+               emit_ar_r(rd[0], rd[1], rm, rn, ctx, BPF_OP(code));
 
                /* Setup JUMP instruction */
                jmp_offset = bpf2a32_offset(i+off, i, ctx);