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Commit 1c49abec authored by Kevin Hao's avatar Kevin Hao Committed by Scott Wood
Browse files

powerpc: introduce macro LOAD_REG_ADDR_PIC 



This is used to get the address of a variable when the kernel is not
running at the linked or relocated address.

Signed-off-by: default avatarKevin Hao <haokexin@gmail.com>
Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
parent 99739611

arch/powerpc/include/asm/ppc_asm.h

+13 −0
Original line number Diff line number Diff line
@@ -295,6 +295,11 @@ GLUE(.,name): 
 *   you want to access various offsets within it).  On ppc32 this is

 *   identical to LOAD_REG_IMMEDIATE.

 *

 * LOAD_REG_ADDR_PIC(rn, name)

 *   Loads the address of label 'name' into register 'run'. Use this when

 *   the kernel doesn't run at the linked or relocated address. Please

 *   note that this macro will clobber the lr register.

 *

 * LOAD_REG_ADDRBASE(rn, name)

 * ADDROFF(name)

 *   LOAD_REG_ADDRBASE loads part of the address of label 'name' into
@@ -305,6 +310,14 @@ GLUE(.,name): 
 *      LOAD_REG_ADDRBASE(rX, name)

 *      ld	rY,ADDROFF(name)(rX)

 */



/* Be careful, this will clobber the lr register. */

#define LOAD_REG_ADDR_PIC(reg, name)		\

	bl	0f;				\

0:	mflr	reg;				\

	addis	reg,reg,(name - 0b)@ha;		\

	addi	reg,reg,(name - 0b)@l;



#ifdef __powerpc64__

#define LOAD_REG_IMMEDIATE(reg,expr)		\

	lis     reg,(expr)@highest;		\