[ARM] Fix params_phys with PIC decompressor builds.

arch/arm/boot/compressed/head.S

@@ -349,6 +349,12 @@ LC0:		.word	LC0			@ r1
 LC1:		.word	reloc_end - reloc_start
 		.size	LC0, . - LC0
 
+		.globl	params
+params:		ldr	r0, =params_phys
+		mov	pc, lr
+		.ltorg
+		.align
+
 /*
  * Turn on the cache.  We need to setup some page tables so that we
  * can have both the I and D caches on.

include/asm-arm/arch-rpc/uncompress.h

@@ -60,8 +60,8 @@ static const unsigned long palette_4[16] = {
  * params_phys is a linker defined symbol - see
  * arch/arm/boot/compressed/Makefile
  */
-extern struct param_struct params_phys;
-#define params (&params_phys)
+extern __attribute__((pure)) struct param_struct *params(void);
+#define params (params())
 
 #ifndef STANDALONE_DEBUG 
 /*