Commit cd4f2011 authored by Jesper Nilsson's avatar Jesper Nilsson
Browse files

CRIS: Faster syscall entry for CRISv32. 



Signed-off-by: default avatarEdgar Iglesias <Edgar.Iglesias@axis.com>
Signed-off-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
parent 43f6cdd7

arch/cris/arch-v32/kernel/entry.S

+17 −20
Original line number Diff line number Diff line
@@ -131,25 +131,22 @@ _resume_userspace: 
system_call:

	;; Stack-frame similar to the irq heads, which is reversed in

	;; ret_from_sys_call.

	subq	12, $sp		; Skip EXS, EDA.

	move	$erp, [$sp]

	subq	4, $sp

	move	$srp, [$sp]

	subq	4, $sp

	move	$ccs, [$sp]

	subq	4, $sp

	ei			; Allow IRQs while handling system call

	move	$spc, [$sp]

	subq	4, $sp

	move	$mof, [$sp]

	subq	4, $sp

	move	$srs, [$sp]

	subq	4, $sp

	move.d	$acr, [$sp]

	subq	14*4, $sp	; Make room for R0-R13.

	movem	$r13, [$sp]	; Push R0-R13

	subq	4, $sp

	move.d	$r10, [$sp]	; Push orig_r10.



	sub.d	92, $sp		; Skip EXS and EDA.

	movem	$r13, [$sp]

	move.d	$sp, $r8

	addq	14*4, $r8

	move.d	$acr, $r0

	move	$srs, $r1

	move	$mof, $r2

	move	$spc, $r3

	move	$ccs, $r4

	move	$srp, $r5

	move	$erp, $r6

	subq	4, $sp

	movem	$r6, [$r8]

	ei			; Enable interrupts while processing syscalls.

	move.d	$r10, [$sp]



	; Set S-bit when kernel debugging to keep hardware breakpoints active.

#ifdef CONFIG_ETRAX_KGDB