[PATCH] arm: add __bswapsi2 support

[Jean-Christophe PLAGNIOL-VILLARD]

32-bit endian conversion

needed by gcc 4.5.1

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 arch/arm/lib/Makefile    |    1 +
 arch/arm/lib/_bswapsi2.S |   14 ++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/lib/_bswapsi2.S

diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 89cb72b..56818e8 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -12,6 +12,7 @@ obj-y	+= lib1funcs.o
 obj-y	+= ashrdi3.o
 obj-y	+= ashldi3.o
 obj-y	+= lshrdi3.o
+obj-y	+= _bswapsi2.o
 obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS)	+= memcpy.o
 obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS)	+= memset.o
 
diff --git a/arch/arm/lib/_bswapsi2.S b/arch/arm/lib/_bswapsi2.S
new file mode 100644
index 0000000..7f45fa5
--- /dev/null
+++ b/arch/arm/lib/_bswapsi2.S
@@ -0,0 +1,14 @@
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+ENTRY(__bswapsi2)
+#if __LINUX_ARM_ARCH__ <= 5
+	eor	r1, r0, r0, ror #16
+	bic	r1, r1, #0xff0000
+	mov	r0, r0, ror #8
+	eor	r0, r0, r1, lsr #8
+#else
+	rev	r0, r0
+#endif
+	bx	lr
+ENDPROC(__bswapsi2)
-- 
1.7.2.3