linux-kernel - [PATCH 3.16 26/99] mips: bpf: fix encoding bug for mm_srlv32

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Message-ID: <lsq.1554212307.468606152@decadent.org.uk>
Date:   Tue, 02 Apr 2019 14:38:27 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Alexei Starovoitov" <ast@...nel.org>,
        "Jiong Wang" <jiong.wang@...ronome.com>,
        linux-mips@...r.kernel.org,
        "Markos Chandras" <markos.chandras@...tec.com>,
        "Song Liu" <songliubraving@...com>,
        "Paul Burton" <paul.burton@...s.com>,
        "Jakub Kicinski" <jakub.kicinski@...ronome.com>
Subject: [PATCH 3.16 26/99] mips: bpf: fix encoding bug for mm_srlv32_op

3.16.65-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jiong Wang <jiong.wang@...ronome.com>

commit 17f6c83fb5ebf7db4fcc94a5be4c22d5a7bfe428 upstream.

For micro-mips, srlv inside POOL32A encoding space should use 0x50
sub-opcode, NOT 0x90.

Some early version ISA doc describes the encoding as 0x90 for both srlv and
srav, this looks to me was a typo. I checked Binutils libopcode
implementation which is using 0x50 for srlv and 0x90 for srav.

v1->v2:
  - Keep mm_srlv32_op sorted by value.

Fixes: f31318fdf324 ("MIPS: uasm: Add srlv uasm instruction")
Cc: Markos Chandras <markos.chandras@...tec.com>
Cc: Paul Burton <paul.burton@...s.com>
Cc: linux-mips@...r.kernel.org
Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Acked-by: Song Liu <songliubraving@...com>
Signed-off-by: Jiong Wang <jiong.wang@...ronome.com>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/include/uapi/asm/inst.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/mips/include/uapi/asm/inst.h
+++ b/arch/mips/include/uapi/asm/inst.h
@@ -262,8 +262,8 @@ enum mm_32a_minor_op {
 	mm_ext_op = 0x02c,
 	mm_pool32axf_op = 0x03c,
 	mm_srl32_op = 0x040,
+	mm_srlv32_op = 0x050,
 	mm_sra_op = 0x080,
-	mm_srlv32_op = 0x090,
 	mm_rotr_op = 0x0c0,
 	mm_lwxs_op = 0x118,
 	mm_addu32_op = 0x150,