[ARM] 3271/1: ARM EABI: fix calling of cmpxchg syscall emulation

Patch from Nicolas Pitre

This is kernel provided user space code.

Since a syscall is used, it has to be updated to work with EABI.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/kernel/entry-armv.S

diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 874e6bb..d401d90 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -735,8 +735,11 @@
 	 * The kernel itself must perform the operation.
 	 * A special ghost syscall is used for that (see traps.c).
 	 */
+	stmfd	sp!, {r7, lr}
+	mov	r7, #0xff00		@ 0xfff0 into r7 for EABI
+	orr	r7, r7, #0xf0
 	swi	#0x9ffff0
-	mov	pc, lr
+	ldmfd	sp!, {r7, pc}
 
 #elif __LINUX_ARM_ARCH__ < 6