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ARM: net: bpf: improve 64-bit ALU implementation 

Improbe the 64-bit ALU implementation from:

  movw    r8, #65532
  movt    r8, #65535
  movw    r9, #65535
  movt    r9, #65535
  ldr     r7, [fp, #-44]
  adds    r7, r7, r8
  str     r7, [fp, #-44]
  ldr     r7, [fp, #-40]
  adc     r7, r7, r9
  str     r7, [fp, #-40]

to:

  movw    r8, #65532
  movt    r8, #65535
  movw    r9, #65535
  movt    r9, #65535
  ldrd    r6, [fp, #-44]
  adds    r6, r6, r8
  adc     r7, r7, r9
  strd    r6, [fp, #-44]

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Russell King 2018-07-12 21:50:56 +01:00 committed by Daniel Borkmann
parent c5eae69257
commit b18bea2a45
1 changed files with 24 additions and 5 deletions
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29
arch/arm/net/bpf_jit_32.c
View File

@ -716,11 +716,30 @@ static inline void emit_a32_alu_r(const s8 dst, const s8 src,
static inline void emit_a32_alu_r64(const bool is64, const s8 dst[],
const s8 src[], struct jit_ctx *ctx,
const u8 op) {
emit_a32_alu_r(dst_lo, src_lo, ctx, is64, false, op);
if (is64)
emit_a32_alu_r(dst_hi, src_hi, ctx, is64, true, op);
else
emit_a32_mov_i(dst_hi, 0, ctx);
const s8 *tmp = bpf2a32[TMP_REG_1];
const s8 *tmp2 = bpf2a32[TMP_REG_2];
const s8 *rd;
rd = arm_bpf_get_reg64(dst, tmp, ctx);
if (is64) {
const s8 *rs;
rs = arm_bpf_get_reg64(src, tmp2, ctx);
/* ALU operation */
emit_alu_r(rd[1], rs[1], true, false, op, ctx);
emit_alu_r(rd[0], rs[0], true, true, op, ctx);
} else {
s8 rs;
rs = arm_bpf_get_reg32(src_lo, tmp2[1], ctx);
/* ALU operation */
emit_alu_r(rd[1], rs, true, false, op, ctx);
emit_a32_mov_i(rd[0], 0, ctx);
}
arm_bpf_put_reg64(dst, rd, ctx);
}
/* dst = src (4 bytes)*/