From: Ilya Leoshkevich <iii@linux.ibm.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Subject: [PATCH bpf-next v2 04/10] s390/bpf: Implement BPF_MOV | BPF_X with sign-extension
Date: Tue, 19 Sep 2023 12:09:06 +0200 [thread overview]
Message-ID: <20230919101336.2223655-5-iii@linux.ibm.com> (raw)
In-Reply-To: <20230919101336.2223655-1-iii@linux.ibm.com>
Implement the cpuv4 register-to-register move with sign extension. It
is distinguished from the normal moves by non-zero values in
insn->off, which determine the source size. s390x has instructions to
deal with all of them: lbr, lhr, lgbr, lghr and lgfr.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
arch/s390/net/bpf_jit_comp.c | 48 ++++++++++++++++++++++++++++++------
1 file changed, 40 insertions(+), 8 deletions(-)
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index e6a643f63ebf..fc8bbddf6533 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -795,15 +795,47 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
/*
* BPF_MOV
*/
- case BPF_ALU | BPF_MOV | BPF_X: /* dst = (u32) src */
- /* llgfr %dst,%src */
- EMIT4(0xb9160000, dst_reg, src_reg);
- if (insn_is_zext(&insn[1]))
- insn_count = 2;
+ case BPF_ALU | BPF_MOV | BPF_X:
+ switch (insn->off) {
+ case 0: /* DST = (u32) SRC */
+ /* llgfr %dst,%src */
+ EMIT4(0xb9160000, dst_reg, src_reg);
+ if (insn_is_zext(&insn[1]))
+ insn_count = 2;
+ break;
+ case 8: /* DST = (u32)(s8) SRC */
+ /* lbr %dst,%src */
+ EMIT4(0xb9260000, dst_reg, src_reg);
+ /* llgfr %dst,%dst */
+ EMIT4(0xb9160000, dst_reg, dst_reg);
+ break;
+ case 16: /* DST = (u32)(s16) SRC */
+ /* lhr %dst,%src */
+ EMIT4(0xb9270000, dst_reg, src_reg);
+ /* llgfr %dst,%dst */
+ EMIT4(0xb9160000, dst_reg, dst_reg);
+ break;
+ }
break;
- case BPF_ALU64 | BPF_MOV | BPF_X: /* dst = src */
- /* lgr %dst,%src */
- EMIT4(0xb9040000, dst_reg, src_reg);
+ case BPF_ALU64 | BPF_MOV | BPF_X:
+ switch (insn->off) {
+ case 0: /* DST = SRC */
+ /* lgr %dst,%src */
+ EMIT4(0xb9040000, dst_reg, src_reg);
+ break;
+ case 8: /* DST = (s8) SRC */
+ /* lgbr %dst,%src */
+ EMIT4(0xb9060000, dst_reg, src_reg);
+ break;
+ case 16: /* DST = (s16) SRC */
+ /* lghr %dst,%src */
+ EMIT4(0xb9070000, dst_reg, src_reg);
+ break;
+ case 32: /* DST = (s32) SRC */
+ /* lgfr %dst,%src */
+ EMIT4(0xb9140000, dst_reg, src_reg);
+ break;
+ }
break;
case BPF_ALU | BPF_MOV | BPF_K: /* dst = (u32) imm */
/* llilf %dst,imm */
--
2.41.0
next prev parent reply other threads:[~2023-09-19 10:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 10:09 [PATCH bpf-next v2 00/10] Implement cpuv4 support for s390x Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 01/10] bpf: Disable zero-extension for BPF_MEMSX Ilya Leoshkevich
2023-09-21 12:35 ` Puranjay Mohan
2023-09-19 10:09 ` [PATCH bpf-next v2 02/10] selftests/bpf: Unmount the cgroup2 work directory Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 03/10] selftests/bpf: Add big-endian support to the ldsx test Ilya Leoshkevich
2023-09-19 10:09 ` Ilya Leoshkevich [this message]
2023-09-19 10:09 ` [PATCH bpf-next v2 05/10] s390/bpf: Implement BPF_MEMSX Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 06/10] s390/bpf: Implement unconditional byte swap Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 07/10] s390/bpf: Implement unconditional jump with 32-bit offset Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 08/10] s390/bpf: Implement signed division Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 09/10] selftests/bpf: Enable the cpuv4 tests for s390x Ilya Leoshkevich
2023-09-19 10:09 ` [PATCH bpf-next v2 10/10] selftests/bpf: Trim DENYLIST.s390x Ilya Leoshkevich
2023-09-21 21:30 ` [PATCH bpf-next v2 00/10] Implement cpuv4 support for s390x patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230919101336.2223655-5-iii@linux.ibm.com \
--to=iii@linux.ibm.com \
--cc=agordeev@linux.ibm.com \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=gor@linux.ibm.com \
--cc=hca@linux.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.