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authorRussell King <rmk+kernel@armlinux.org.uk>2018-07-12 21:50:51 +0100
committerDaniel Borkmann <daniel@iogearbox.net>2018-07-13 15:26:42 +0200
commitc5eae692571d6c44efeb27fe78a5ed8b5ded9b4a (patch)
tree89baa9ccc8322eaa6397399121613cbbd678a362 /arch/arm/net
parent077513b89424ba814432b1cd7d7f793958059ed8 (diff)
downloadlinux-c5eae692571d6c44efeb27fe78a5ed8b5ded9b4a.tar.bz2
ARM: net: bpf: improve 64-bit store implementation
Improve the 64-bit store implementation from: ldr r6, [fp, #-8] str r8, [r6] ldr r6, [fp, #-8] mov r7, #4 add r7, r6, r7 str r9, [r7] to: ldr r6, [fp, #-8] str r8, [r6] str r9, [r6, #4] We leave the store as two separate STR instructions rather than using STRD as the store may not be aligned, and STR can handle misalignment. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'arch/arm/net')
-rw-r--r--arch/arm/net/bpf_jit_32.c52
1 files changed, 26 insertions, 26 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
index 3a182e618441..026612ee8151 100644
--- a/arch/arm/net/bpf_jit_32.c
+++ b/arch/arm/net/bpf_jit_32.c
@@ -975,29 +975,42 @@ static inline void emit_a32_mul_r64(const s8 dst[], const s8 src[],
}
/* *(size *)(dst + off) = src */
-static inline void emit_str_r(const s8 dst, const s8 src,
- const s32 off, struct jit_ctx *ctx, const u8 sz){
+static inline void emit_str_r(const s8 dst, const s8 src[],
+ s32 off, struct jit_ctx *ctx, const u8 sz){
const s8 *tmp = bpf2a32[TMP_REG_1];
+ s32 off_max;
s8 rd;
rd = arm_bpf_get_reg32(dst, tmp[1], ctx);
- if (off) {
+
+ if (sz == BPF_H)
+ off_max = 0xff;
+ else
+ off_max = 0xfff;
+
+ if (off < 0 || off > off_max) {
emit_a32_mov_i(tmp[0], off, ctx);
- emit(ARM_ADD_R(tmp[0], rd, tmp[0]), ctx);
+ emit(ARM_ADD_R(tmp[0], tmp[0], rd), ctx);
rd = tmp[0];
+ off = 0;
}
switch (sz) {
- case BPF_W:
- /* Store a Word */
- emit(ARM_STR_I(src, rd, 0), ctx);
+ case BPF_B:
+ /* Store a Byte */
+ emit(ARM_STRB_I(src_lo, rd, off), ctx);
break;
case BPF_H:
/* Store a HalfWord */
- emit(ARM_STRH_I(src, rd, 0), ctx);
+ emit(ARM_STRH_I(src_lo, rd, off), ctx);
break;
- case BPF_B:
- /* Store a Byte */
- emit(ARM_STRB_I(src, rd, 0), ctx);
+ case BPF_W:
+ /* Store a Word */
+ emit(ARM_STR_I(src_lo, rd, off), ctx);
+ break;
+ case BPF_DW:
+ /* Store a Double Word */
+ emit(ARM_STR_I(src_lo, rd, off), ctx);
+ emit(ARM_STR_I(src_hi, rd, off + 4), ctx);
break;
}
}
@@ -1539,16 +1552,14 @@ exit:
case BPF_DW:
/* Sign-extend immediate value into temp reg */
emit_a32_mov_se_i64(true, tmp2, imm, ctx);
- emit_str_r(dst_lo, tmp2[1], off, ctx, BPF_W);
- emit_str_r(dst_lo, tmp2[0], off+4, ctx, BPF_W);
break;
case BPF_W:
case BPF_H:
case BPF_B:
emit_a32_mov_i(tmp2[1], imm, ctx);
- emit_str_r(dst_lo, tmp2[1], off, ctx, BPF_SIZE(code));
break;
}
+ emit_str_r(dst_lo, tmp2, off, ctx, BPF_SIZE(code));
break;
/* STX XADD: lock *(u32 *)(dst + off) += src */
case BPF_STX | BPF_XADD | BPF_W:
@@ -1560,20 +1571,9 @@ exit:
case BPF_STX | BPF_MEM | BPF_H:
case BPF_STX | BPF_MEM | BPF_B:
case BPF_STX | BPF_MEM | BPF_DW:
- {
- u8 sz = BPF_SIZE(code);
-
rs = arm_bpf_get_reg64(src, tmp2, ctx);
-
- /* Store the value */
- if (BPF_SIZE(code) == BPF_DW) {
- 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, rs[1], off, ctx, sz);
- }
+ emit_str_r(dst_lo, rs, off, ctx, BPF_SIZE(code));
break;
- }
/* PC += off if dst == src */
/* PC += off if dst > src */
/* PC += off if dst >= src */