linux-kernel - [tip:x86/debug] x86/asm/crypto: Move jump

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Message-ID: <tip-c26ac7081af1f1cd05ccfea858d455100255cfd0@git.kernel.org>
Date:	Tue, 23 Feb 2016 00:58:34 -0800
From:	tip-bot for Josh Poimboeuf <tipbot@...or.com>@zytor.com
To:	linux-tip-commits@...r.kernel.org@...or.com
Cc:	jpoimboe@...hat.com, bp@...en8.de, torvalds@...ux-foundation.org,
	palves@...hat.com, herbert@...dor.apana.org.au, mmarek@...e.cz,
	acme@...nel.org, namhyung@...il.com, tglx@...utronix.de,
	brgerst@...il.com, peterz@...radead.org, jslaby@...e.cz,
	akpm@...ux-foundation.org, bp@...e.de, bernd@...rovitsch.priv.at,
	luto@...capital.net, dvlasenk@...hat.com, davem@...emloft.net,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	chris.j.arges@...onical.com, luto@...nel.org, hpa@...or.com
Subject: [tip:x86/debug] x86/asm/crypto: Move jump_table to .rodata section

Commit-ID:  c26ac7081af1f1cd05ccfea858d455100255cfd0
Gitweb:     http://git.kernel.org/tip/c26ac7081af1f1cd05ccfea858d455100255cfd0
Author:     Josh Poimboeuf <jpoimboe@...hat.com>
AuthorDate: Thu, 21 Jan 2016 16:49:16 -0600
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 23 Feb 2016 09:03:56 +0100

x86/asm/crypto: Move jump_table to .rodata section

stacktool reports the following warning:

  stacktool: arch/x86/crypto/crc32c-pcl-intel-asm_64.o: crc_pcl()+0x11dd: can't decode instruction

It gets confused when trying to decode jump_table data.  Move jump_table
to the .rodata section which is a more appropriate home for read-only
data.

Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
Reviewed-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Bernd Petrovitsch <bernd@...rovitsch.priv.at>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Chris J Arges <chris.j.arges@...onical.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Pedro Alves <palves@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: live-patching@...r.kernel.org
Link: http://lkml.kernel.org/r/1dbf80c097bb9d89c0cbddc01a815ada690e3b32.1453405861.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/crypto/crc32c-pcl-intel-asm_64.S | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
index 4fe27e0..dc05f01 100644
--- a/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
+++ b/arch/x86/crypto/crc32c-pcl-intel-asm_64.S
@@ -170,8 +170,8 @@ continue_block:
 	## branch into array
 	lea	jump_table(%rip), bufp
 	movzxw  (bufp, %rax, 2), len
-	offset=crc_array-jump_table
-	lea     offset(bufp, len, 1), bufp
+	lea	crc_array(%rip), bufp
+	lea     (bufp, len, 1), bufp
 	jmp     *bufp
 
 	################################################################
@@ -310,7 +310,9 @@ do_return:
 	popq    %rdi
 	popq    %rbx
         ret
+ENDPROC(crc_pcl)
 
+.section	.rodata, "a", %progbits
         ################################################################
         ## jump table        Table is 129 entries x 2 bytes each
         ################################################################
@@ -324,13 +326,11 @@ JMPTBL_ENTRY %i
 	i=i+1
 .endr
 
-ENDPROC(crc_pcl)
 
 	################################################################
 	## PCLMULQDQ tables
 	## Table is 128 entries x 2 words (8 bytes) each
 	################################################################
-.section	.rodata, "a", %progbits
 .align 8
 K_table:
 	.long 0x493c7d27, 0x00000001