Commit 9de7fc30 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: entry: SAVE_ABI_CALLEE_REG: ISA/ABI specific helper 



And for ARcompact variant replace the PUSH/POP macros with gas provided
push/pop pseudo-instructions

This allows ISA specific implementation

e.g. Current ARCv2 PUSH/POP could be replaced with STD/LDL to save 2
registers at a time (w/o bothering with SP update each time) or
perhaps use ENTER_S/LEAVE_S to reduce code size

For ARCv3 ABI changed so callee regs are now r14-r26 (vs. r13-r25)
thus would need a different implementation.

Signed-off-by: default avatarVineet Gupta <vgupta@kernel.org>
parent 33cc938e

arch/arc/include/asm/entry-arcv2.h

+32 −0
Original line number Diff line number Diff line
@@ -291,4 +291,36 @@ 
				/* M = 8-1  N = 8 */

.endm



.macro SAVE_ABI_CALLEE_REGS

	push	r13

	push	r14

	push	r15

	push	r16

	push	r17

	push	r18

	push	r19

	push	r20

	push	r21

	push	r22

	push	r23

	push	r24

	push	r25

.endm



.macro RESTORE_ABI_CALLEE_REGS

	pop	r25

	pop	r24

	pop	r23

	pop	r22

	pop	r21

	pop	r20

	pop	r19

	pop	r18

	pop	r17

	pop	r16

	pop	r15

	pop	r14

	pop	r13

.endm



#endif

arch/arc/include/asm/entry-compact.h

+32 −0
Original line number Diff line number Diff line
@@ -33,6 +33,38 @@ 
#include <asm/irqflags-compact.h>

#include <asm/thread_info.h>	/* For THREAD_SIZE */



.macro SAVE_ABI_CALLEE_REGS

	push	r13

	push	r14

	push	r15

	push	r16

	push	r17

	push	r18

	push	r19

	push	r20

	push	r21

	push	r22

	push	r23

	push	r24

	push	r25

.endm



.macro RESTORE_ABI_CALLEE_REGS

	pop	r25

	pop	r24

	pop	r23

	pop	r22

	pop	r21

	pop	r20

	pop	r19

	pop	r18

	pop	r17

	pop	r16

	pop	r15

	pop	r14

	pop	r13

.endm



/*--------------------------------------------------------------

 * Switch to Kernel Mode stack if SP points to User Mode stack

 *

arch/arc/include/asm/entry.h

+4 −40
Original line number Diff line number Diff line
@@ -87,48 +87,12 @@ 


.endm



/*--------------------------------------------------------------

 * Helpers to save/restore callee-saved regs:

 * used by several macros below

 *-------------------------------------------------------------*/

.macro SAVE_R13_TO_R25

	PUSH	r13

	PUSH	r14

	PUSH	r15

	PUSH	r16

	PUSH	r17

	PUSH	r18

	PUSH	r19

	PUSH	r20

	PUSH	r21

	PUSH	r22

	PUSH	r23

	PUSH	r24

	PUSH	r25

.endm



.macro RESTORE_R25_TO_R13

	POP	r25

	POP	r24

	POP	r23

	POP	r22

	POP	r21

	POP	r20

	POP	r19

	POP	r18

	POP	r17

	POP	r16

	POP	r15

	POP	r14

	POP	r13

.endm



/*

 * save user mode callee regs as struct callee_regs

 *  - needed by fork/do_signal/unaligned-access-emulation.

 */

.macro SAVE_CALLEE_SAVED_USER

	SAVE_R13_TO_R25

	SAVE_ABI_CALLEE_REGS

.endm



/*
@@ -136,18 +100,18 @@ 
 *  - could have been changed by ptrace tracer or unaligned-access fixup

 */

.macro RESTORE_CALLEE_SAVED_USER

	RESTORE_R25_TO_R13

	RESTORE_ABI_CALLEE_REGS

.endm



/*

 * save/restore kernel mode callee regs at the time of context switch

 */

.macro SAVE_CALLEE_SAVED_KERNEL

	SAVE_R13_TO_R25

	SAVE_ABI_CALLEE_REGS

.endm



.macro RESTORE_CALLEE_SAVED_KERNEL

	RESTORE_R25_TO_R13

	RESTORE_ABI_CALLEE_REGS

.endm



/*--------------------------------------------------------------

arch/arc/include/asm/ptrace.h

+8 −6
Original line number Diff line number Diff line
@@ -54,6 +54,10 @@ struct pt_regs { 
	ecr_reg ecr;

};



struct callee_regs {

	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;

};



#define MAX_REG_OFFSET offsetof(struct pt_regs, ecr)



#else
@@ -92,16 +96,14 @@ struct pt_regs { 
	unsigned long status32;

};



#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)



#endif



/* Callee saved registers - need to be saved only when you are scheduled out */



struct callee_regs {

	unsigned long r25, r24, r23, r22, r21, r20, r19, r18, r17, r16, r15, r14, r13;

};



#define MAX_REG_OFFSET offsetof(struct pt_regs, status32)



#endif



#define instruction_pointer(regs)	((regs)->ret)

#define profile_pc(regs)		instruction_pointer(regs)