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authorYang Shi <yang.shi@linaro.org>2015-11-12 13:57:00 -0800
committerDavid S. Miller <davem@davemloft.net>2015-11-16 14:38:42 -0500
commit0fcd593b943bfcc21ad84d3321422401de071d8a (patch)
tree8f39ef257eb47c668f0f4643856aa48e109f9bed /arch/arm64/net/bpf_jit_comp.c
parentnet: phy: vitesse: add support for VSC8601 (diff)
downloadlinux-dev-0fcd593b943bfcc21ad84d3321422401de071d8a.tar.xz
linux-dev-0fcd593b943bfcc21ad84d3321422401de071d8a.zip
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>
Diffstat (limited to 'arch/arm64/net/bpf_jit_comp.c')
-rw-r--r--arch/arm64/net/bpf_jit_comp.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index a44e5293c6f5..ac8b548ce493 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -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);