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CRIS: Faster syscall entry for CRISv32.

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Signed-off-by: Edgar Iglesias <Edgar.Iglesias@axis.com>
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
This commit is contained in:
Jesper Nilsson 2010-08-02 18:13:45 +02:00
parent 43f6cdd769
commit cd4f20110c
1 changed files with 17 additions and 20 deletions
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37
arch/cris/arch-v32/kernel/entry.S
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@ -131,27 +131,24 @@ _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.
; Set S-bit when kernel debugging to keep hardware breakpoints active.
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
move $ccs, $r0
or.d (1<<9), $r0