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ARC: entry: SAVE_ABI_CALLEE_REG: ISA/ABI specific helper

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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: Vineet Gupta <vgupta@kernel.org>
This commit is contained in:
Vineet Gupta 2020-05-21 13:33:24 -07:00
parent 33cc938e65
commit 9de7fc30f2
4 changed files with 76 additions and 46 deletions
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32
arch/arc/include/asm/entry-arcv2.h
View File

@ -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

32
arch/arc/include/asm/entry-compact.h
View File

@ -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
*

44
arch/arc/include/asm/entry.h
View File

@ -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
/*--------------------------------------------------------------

14
arch/arc/include/asm/ptrace.h
View File

@ -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)