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arm64: bpf: optimize LD_ABS, LD_IND
author
Zi Shen Lim
<zlim.lnx@gmail.com>
Thu, 9 Jun 2016 04:18:50 +0000
(21:18 -0700)
committer
David S. Miller
<davem@davemloft.net>
Sat, 11 Jun 2016 06:11:50 +0000
(23:11 -0700)
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>
arch/arm64/net/bpf_jit_comp.c
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diff --git
a/arch/arm64/net/bpf_jit_comp.c
b/arch/arm64/net/bpf_jit_comp.c
index 7ae304e0a0786c9655cd07e89d75c392bb741a49..b2fc97a2c56c80fe633777bbb18322c980949953 100644
(file)
--- a/
arch/arm64/net/bpf_jit_comp.c
+++ b/
arch/arm64/net/bpf_jit_comp.c
@@
-731,11
+731,8
@@
emit_cond_jmp:
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);