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arm64: bpf: fix JIT frame pointer setup 

BPF fp should point to the top of the BPF prog stack. The original
implementation made it point to the bottom incorrectly.
Move A64_SP to fp before reserve BPF prog stack space.

CC: Zi Shen Lim <zlim.lnx@gmail.com>
CC: Xi Wang <xi.wang@gmail.com>
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Reviewed-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yang Shi 2015-11-12 13:57:00 -08:00 committed by David S. Miller
parent 7729b05381
commit 0fcd593b94
1 changed files with 3 additions and 3 deletions
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6
arch/arm64/net/bpf_jit_comp.c
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@ -161,12 +161,12 @@ static void build_prologue(struct jit_ctx *ctx)
if (ctx->tmp_used)
emit(A64_PUSH(tmp1, tmp2, A64_SP), ctx);
/* Set up BPF stack */
emit(A64_SUB_I(1, A64_SP, A64_SP, stack_size), ctx);
/* Set up frame pointer */
emit(A64_MOV(1, fp, A64_SP), ctx);
/* Set up BPF stack */
emit(A64_SUB_I(1, A64_SP, A64_SP, stack_size), ctx);
/* Clear registers A and X */
emit_a64_mov_i64(ra, 0, ctx);
emit_a64_mov_i64(rx, 0, ctx);