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gcc: Fix volatile access issue for ARM 

[YOCTO #1130]

This patch brings in a patch from gcc for the following issue:

http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01477.html

(From OE-Core rev: 347c30801b6f935a6aefa5578d723a8afcf52790)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Saul Wold 2011-06-01 17:50:22 -07:00 committed by Richard Purdie
parent c51a6b5756
commit 83158a384f
2 changed files with 31 additions and 1 deletions
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4
meta/recipes-devtools/gcc/gcc-4.6.0.inc
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@ -7,7 +7,7 @@ require gcc-common.inc
require gcc-4_6-branch-backports.inc
PR = "r2"
PR = "r3"
DEPENDS =+ "mpfr gmp libmpc"
NATIVEDEPS = "mpfr-native gmp-native gettext-native libmpc-native"
@ -53,7 +53,9 @@ SRC_URI = "${GNU_MIRROR}/gcc/gcc-${PV}/gcc-${PV}.tar.bz2 \
file://gcc-poison-parameters.patch \
file://GPLUSPLUS_INCLUDE_DIR_with_sysroot.patch \
file://COLLECT_GCC_OPTIONS.patch \
file://volatile_access_backport.patch \
"
SRC_URI_append_sh3 = " file://sh3-installfix-fixheaders.patch;patch=1 "
SRC_URI[md5sum] = "93d1c436bf991564524701259b6285a2"

28
meta/recipes-devtools/gcc/gcc-4.6.0/volatile_access_backport.patch Normal file
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@ -0,0 +1,28 @@
Pulled from http://gcc.gnu.org/ml/gcc-patches/2011-03/msg01477.html
Upstream-Status: Backport
Signed-off-by: Saul Wold <sgw@linux.intel.com>
gcc/
* expr.c (expand_expr_real_1): Only use BLKmode for volatile
accesses which are not naturally aligned.
Index: gcc-4.6.0/gcc/expr.c
===================================================================
--- gcc-4.6.0.orig/gcc/expr.c 2011-06-01 15:28:55.000000000 -0700
+++ gcc-4.6.0/gcc/expr.c 2011-06-01 15:41:17.154848182 -0700
@@ -9178,8 +9178,11 @@
&& modifier != EXPAND_CONST_ADDRESS
&& modifier != EXPAND_INITIALIZER)
/* If the field is volatile, we always want an aligned
- access. */
- || (volatilep && flag_strict_volatile_bitfields > 0)
+ access. Only do this if the access is not already naturally
+ aligned, otherwise "normal" (non-bitfield) volatile fields
+ become non-addressable. */
+ || (volatilep && flag_strict_volatile_bitfields > 0
+ && (bitpos % GET_MODE_ALIGNMENT (mode) != 0))
/* If the field isn't aligned enough to fetch as a memref,
fetch it as a bit field. */
|| (mode1 != BLKmode