diff options
| author | Alex Shi <alex.shi@linaro.org> | 2015-06-25 16:17:21 +0800 |
|---|---|---|
| committer | Alex Shi <alex.shi@linaro.org> | 2015-06-25 16:19:06 +0800 |
| commit | bd4e9a26373331ef6f185500c72a8836eb7c82d9 (patch) | |
| tree | 13384e7649be7bb88ab9524efcbc602be85d5020 /arch/arm/net/bpf_jit_32.c | |
| parent | 2528dbd348dd541e090594b7aac3f62351078388 (diff) | |
| parent | 2cb9802eeb7f919f97df05b16ec128f4f5af366d (diff) | |
Merge branch 'linux-linaro-lsk-v3.14' into linux-linaro-lsk-v3.14-androidlsk-v3.14-15.07-android
Conflicts:
fs/exec.c
Solutions:
follow commit d221244a7
sched: move no_new_privs into new atomic flags
to use task_no_new_privs(current).
Diffstat (limited to 'arch/arm/net/bpf_jit_32.c')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 271b5e971568..6adf5913a7ac 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -449,10 +449,21 @@ static inline void emit_udiv(u8 rd, u8 rm, u8 rn, struct jit_ctx *ctx) return; } #endif - if (rm != ARM_R0) - emit(ARM_MOV_R(ARM_R0, rm), ctx); + + /* + * For BPF_ALU | BPF_DIV | BPF_K instructions, rm is ARM_R4 + * (r_A) and rn is ARM_R0 (r_scratch) so load rn first into + * ARM_R1 to avoid accidentally overwriting ARM_R0 with rm + * before using it as a source for ARM_R1. + * + * For BPF_ALU | BPF_DIV | BPF_X rm is ARM_R4 (r_A) and rn is + * ARM_R5 (r_X) so there is no particular register overlap + * issues. + */ if (rn != ARM_R1) emit(ARM_MOV_R(ARM_R1, rn), ctx); + if (rm != ARM_R0) + emit(ARM_MOV_R(ARM_R0, rm), ctx); ctx->seen |= SEEN_CALL; emit_mov_i(ARM_R3, (u32)jit_udiv, ctx); |