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arm64: bpf: optimize LD_ABS, LD_IND 

Remove superfluous stack frame, saving us 3 instructions for every
LD_ABS or LD_IND.

Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zi Shen Lim 2016-06-08 21:18:50 -07:00 committed by David S. Miller
parent 997ce88832
commit 643c332d51
1 changed files with 0 additions and 3 deletions
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3
arch/arm64/net/bpf_jit_comp.c
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@ -731,11 +731,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
emit_a64_mov_i64(r3, size, ctx);
emit(A64_SUB_I(1, r4, fp, STACK_SIZE), ctx);
emit_a64_mov_i64(r5, (unsigned long)bpf_load_pointer, ctx);
emit(A64_PUSH(A64_FP, A64_LR, A64_SP), ctx);
emit(A64_MOV(1, A64_FP, A64_SP), ctx);
emit(A64_BLR(r5), ctx);
emit(A64_MOV(1, r0, A64_R(0)), ctx);
emit(A64_POP(A64_FP, A64_LR, A64_SP), ctx);
jmp_offset = epilogue_offset(ctx);
check_imm19(jmp_offset);