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bpf, arm64: Call build_prologue() first in first JIT pass

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BPF line info needs ctx->offset to be the instruction offset in the whole JITed
image instead of the body itself, so also call build_prologue() first in first
JIT pass.

Fixes: 37ab566c17 ("bpf: arm64: Enable arm64 jit to provide bpf_line_info")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220226121906.5709-2-houtao1@huawei.com
This commit is contained in:
Hou Tao 2022-02-26 20:19:05 +08:00 committed by Daniel Borkmann
parent 80bebebdac
commit 68e4f238b0
1 changed files with 8 additions and 5 deletions
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13
arch/arm64/net/bpf_jit_comp.c
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@ -1049,15 +1049,18 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
goto out_off;
}
/* 1. Initial fake pass to compute ctx->idx. */
/* Fake pass to fill in ctx->offset. */
if (build_body(&ctx, extra_pass)) {
/*
* 1. Initial fake pass to compute ctx->idx and ctx->offset.
*
* BPF line info needs ctx->offset[i] to be the offset of
* instruction[i] in jited image, so build prologue first.
*/
if (build_prologue(&ctx, was_classic)) {
prog = orig_prog;
goto out_off;
}
if (build_prologue(&ctx, was_classic)) {
if (build_body(&ctx, extra_pass)) {
prog = orig_prog;
goto out_off;
}