bpf, arm64: use emit_addr_mov_i64() for BPF_PSEUDO_FUNC #2351
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The following error is reported when running "./test_progs -t for_each"
under arm64:
bpf_jit: multi-func JIT bug 58 != 56
......
JIT doesn't support bpf-to-bpf calls
The root cause is the size of BPF_PSEUDO_FUNC instruction increases
from 2 to 3 after the address of called bpf-function is settled and
there are two bpf-to-bpf calls in test_pkt_access. The generated
instructions are shown below:
>before callback_fn is jited, its addr is 0x1-00000001
0x48: 21 00 C0 D2 movz x1, #0x1, lsl #32
0x4c: 21 00 80 F2 movk x1, #0x1
>after callback_fn is jited, its addr is 0xfffffe0017f2fb84
0x48: E1 3F C0 92 movn x1, #0x1ff, lsl #32
0x4c: 41 FE A2 F2 movk x1, #0x17f2, lsl #16
0x50: 81 70 9F F2 movk x1, #0xfb84
Fixing it by using emit_addr_mov_i64() for BPF_PSEUDO_FUNC, so
the size of jited image will not change.
Fixes: 69c087b ("bpf: Add bpf_for_each_map_elem() helper")
Signed-off-by: Hou Tao <[email protected]>
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Pull request for series with
subject: bpf, arm64: use emit_addr_mov_i64() for BPF_PSEUDO_FUNC
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=602174