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| author | Alexei Starovoitov <ast@kernel.org> | 2024-03-06 06:19:28 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2024-03-07 02:18:04 +0300 |
| commit | 06375801525717173aee790310b7d959bb77879b (patch) | |
| tree | 56f571c37744c55fbab9eb4952875c1725e968e7 /tools/testing/selftests/bpf/test_tcp_hdr_options.h | |
| parent | 4f81c16f50baf6d5d8bfa6eef3250dcfa22cbc08 (diff) | |
| download | linux-06375801525717173aee790310b7d959bb77879b.tar.xz | |
bpf: Add cond_break macro
Use may_goto instruction to implement cond_break macro.
Ideally the macro should be written as:
asm volatile goto(".byte 0xe5;
.byte 0;
.short %l[l_break] ...
.long 0;
but LLVM doesn't recognize fixup of 2 byte PC relative yet.
Hence use
asm volatile goto(".byte 0xe5;
.byte 0;
.long %l[l_break] ...
.short 0;
that produces correct asm on little endian.
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Tested-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20240306031929.42666-4-alexei.starovoitov@gmail.com
Diffstat (limited to 'tools/testing/selftests/bpf/test_tcp_hdr_options.h')
0 files changed, 0 insertions, 0 deletions