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Commit 643c332d authored by Zi Shen Lim's avatar Zi Shen Lim Committed by David S. Miller
Browse files

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: default avatarZi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 997ce888

arch/arm64/net/bpf_jit_comp.c

+0 −3
Original line number Diff line number Diff line
@@ -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);