linux-kernel - [PATCH v12 15/21] x86/asm/crypto: Move jump

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Date:	Wed,  9 Sep 2015 08:21:54 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	"Chris J Arges" <chris.j.arges@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH v12 15/21] 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>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
---
 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 225be06..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	.rotata, "a", %progbits
 .align 8
 K_table:
 	.long 0x493c7d27, 0x00000001
-- 
2.4.3

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