diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2018-07-12 22:50:46 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-07-13 15:26:41 +0200 |
| commit | 077513b89424ba814432b1cd7d7f793958059ed8 (patch) | |
| tree | 65736a0782df90129a6b929afb830ebbd173808a | |
| parent | ARM: net: bpf: improve 64-bit load immediate implementation (diff) | |
| download | linux-077513b89424ba814432b1cd7d7f793958059ed8.tar.xz linux-077513b89424ba814432b1cd7d7f793958059ed8.zip | |
ARM: net: bpf: improve 64-bit sign-extended immediate load
Improve the 64-bit sign-extended immediate from:
mov r6, #1
str r6, [fp, #-52] ; 0xffffffcc
mov r6, #0
str r6, [fp, #-48] ; 0xffffffd0
to:
mov r6, #1
mov r7, #0
strd r6, [fp, #-52] ; 0xffffffcc
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 6558bd73bbb9..3a182e618441 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -613,12 +613,11 @@ static void emit_a32_mov_i64(const s8 dst[], u64 val, struct jit_ctx *ctx) /* Sign extended move */ static inline void emit_a32_mov_se_i64(const bool is64, const s8 dst[], const u32 val, struct jit_ctx *ctx) { - u32 hi = 0; + u64 val64 = val; if (is64 && (val & (1<<31))) - hi = (u32)~0; - emit_a32_mov_i(dst_lo, val, ctx); - emit_a32_mov_i(dst_hi, hi, ctx); + val64 |= 0xffffffff00000000ULL; + emit_a32_mov_i64(dst, val64, ctx); } static inline void emit_a32_add_r(const u8 dst, const u8 src, |