From: Nicholas Dudar <main.kalliope@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
eddyz87@gmail.com, memxor@gmail.com,
johan.almbladh@anyfinetworks.com, paulburton@kernel.org,
tsbogend@alpha.franken.de
Cc: martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev,
jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev,
bpf@vger.kernel.org, linux-mips@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf-next v3 1/2] bpf, mips: Factor register moves into helpers
Date: Sat, 12 Sep 2026 00:12:19 -0400 [thread overview]
Message-ID: <20260912041220.444715-2-main.kalliope@gmail.com> (raw)
In-Reply-To: <20260912041220.444715-1-main.kalliope@gmail.com>
Factor ALU32 and ALU64 register moves into backend-local helpers,
keeping register-pair handling and zero extension with the move.
This prepares for decoding the MOVSX width in those helpers.
Keep the verifier-inserted zero-extension marker on its existing path.
No functional change intended.
Assisted-by: Codex:gpt-6
Signed-off-by: Nicholas Dudar <main.kalliope@gmail.com>
---
arch/mips/net/bpf_jit_comp32.c | 22 ++++++++++++++++++----
arch/mips/net/bpf_jit_comp64.c | 18 +++++++++++++++---
2 files changed, 33 insertions(+), 7 deletions(-)
diff --git a/arch/mips/net/bpf_jit_comp32.c b/arch/mips/net/bpf_jit_comp32.c
index 6619182b5ef..6d603d9eeb1 100644
--- a/arch/mips/net/bpf_jit_comp32.c
+++ b/arch/mips/net/bpf_jit_comp32.c
@@ -190,6 +190,22 @@ static void emit_zext_ver(struct jit_context *ctx, const u8 dst[])
}
}
+/* Register move operation (32-bit) */
+static void emit_mov_r32(struct jit_context *ctx, const u8 dst[],
+ const u8 src[])
+{
+ emit_mov_r(ctx, lo(dst), lo(src));
+ emit_zext_ver(ctx, dst);
+}
+
+/* Register move operation (64-bit) */
+static void emit_mov_r64(struct jit_context *ctx, const u8 dst[],
+ const u8 src[])
+{
+ emit_mov_r(ctx, lo(dst), lo(src));
+ emit_mov_r(ctx, hi(dst), hi(src));
+}
+
/* Load delay slot, if ISA mandates it */
static void emit_load_delay(struct jit_context *ctx)
{
@@ -1494,8 +1510,7 @@ int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
/* Special mov32 for zext */
emit_mov_i(ctx, hi(dst), 0);
} else {
- emit_mov_r(ctx, lo(dst), lo(src));
- emit_zext_ver(ctx, dst);
+ emit_mov_r32(ctx, dst, src);
}
break;
/* dst = -dst */
@@ -1564,8 +1579,7 @@ int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
break;
/* dst = src (64-bit) */
case BPF_ALU64 | BPF_MOV | BPF_X:
- emit_mov_r(ctx, lo(dst), lo(src));
- emit_mov_r(ctx, hi(dst), hi(src));
+ emit_mov_r64(ctx, dst, src);
break;
/* dst = -dst (64-bit) */
case BPF_ALU64 | BPF_NEG:
diff --git a/arch/mips/net/bpf_jit_comp64.c b/arch/mips/net/bpf_jit_comp64.c
index db027c2d922..92df2eba139 100644
--- a/arch/mips/net/bpf_jit_comp64.c
+++ b/arch/mips/net/bpf_jit_comp64.c
@@ -120,6 +120,19 @@ static void emit_zext_ver(struct jit_context *ctx, u8 dst)
emit_zext(ctx, dst);
}
+/* Register move operation (32-bit) */
+static void emit_mov_r32(struct jit_context *ctx, u8 dst, u8 src)
+{
+ emit_mov_r(ctx, dst, src);
+ emit_zext_ver(ctx, dst);
+}
+
+/* Register move operation (64-bit) */
+static void emit_mov_r64(struct jit_context *ctx, u8 dst, u8 src)
+{
+ emit_mov_r(ctx, dst, src);
+}
+
/* dst = imm (64-bit) */
static void emit_mov_i64(struct jit_context *ctx, u8 dst, u64 imm64)
{
@@ -681,8 +694,7 @@ int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
/* Special mov32 for zext */
emit_zext(ctx, dst);
} else {
- emit_mov_r(ctx, dst, src);
- emit_zext_ver(ctx, dst);
+ emit_mov_r32(ctx, dst, src);
}
break;
/* dst = -dst */
@@ -767,7 +779,7 @@ int build_insn(const struct bpf_insn *insn, struct jit_context *ctx)
break;
/* dst = src (64-bit) */
case BPF_ALU64 | BPF_MOV | BPF_X:
- emit_mov_r(ctx, dst, src);
+ emit_mov_r64(ctx, dst, src);
break;
/* dst = -dst (64-bit) */
case BPF_ALU64 | BPF_NEG:
next prev parent reply other threads:[~2026-09-12 4:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-12 4:12 [PATCH bpf-next v3 0/2] bpf, mips: Add BPF_MOVSX support to the JITs Nicholas Dudar
2026-09-12 4:12 ` Nicholas Dudar [this message]
2026-09-12 4:12 ` [PATCH bpf-next v3 2/2] bpf, mips: Add support for BPF_MOVSX in " Nicholas Dudar
2026-09-12 5:03 ` bot+bpf-ci
2026-09-12 19:37 ` Nicholas Dudar
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=20260912041220.444715-2-main.kalliope@gmail.com \
--to=main.kalliope@gmail.com \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=eddyz87@gmail.com \
--cc=emil@etsalapatis.com \
--cc=ihor.solodrai@linux.dev \
--cc=johan.almbladh@anyfinetworks.com \
--cc=jolsa@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=martin.lau@linux.dev \
--cc=memxor@gmail.com \
--cc=paulburton@kernel.org \
--cc=song@kernel.org \
--cc=tsbogend@alpha.franken.de \
--cc=yonghong.song@linux.dev \
/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.