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-rw-r--r--arch/alpha/lib/clear_user.S66
1 files changed, 26 insertions, 40 deletions
diff --git a/arch/alpha/lib/clear_user.S b/arch/alpha/lib/clear_user.S
index bf5b931866ba..006f469fef73 100644
--- a/arch/alpha/lib/clear_user.S
+++ b/arch/alpha/lib/clear_user.S
@@ -8,21 +8,6 @@
* right "bytes left to zero" value (and that it is updated only _after_
* a successful copy). There is also some rather minor exception setup
* stuff.
- *
- * NOTE! This is not directly C-callable, because the calling semantics
- * are different:
- *
- * Inputs:
- * length in $0
- * destination address in $6
- * exception pointer in $7
- * return address in $28 (exceptions expect it there)
- *
- * Outputs:
- * bytes left to copy in $0
- *
- * Clobbers:
- * $1,$2,$3,$4,$5,$6
*/
#include <asm/export.h>
@@ -38,62 +23,63 @@
.set noreorder
.align 4
- .globl __do_clear_user
- .ent __do_clear_user
- .frame $30, 0, $28
+ .globl __clear_user
+ .ent __clear_user
+ .frame $30, 0, $26
.prologue 0
$loop:
and $1, 3, $4 # e0 :
beq $4, 1f # .. e1 :
-0: EX( stq_u $31, 0($6) ) # e0 : zero one word
+0: EX( stq_u $31, 0($16) ) # e0 : zero one word
subq $0, 8, $0 # .. e1 :
subq $4, 1, $4 # e0 :
- addq $6, 8, $6 # .. e1 :
+ addq $16, 8, $16 # .. e1 :
bne $4, 0b # e1 :
unop # :
1: bic $1, 3, $1 # e0 :
beq $1, $tail # .. e1 :
-2: EX( stq_u $31, 0($6) ) # e0 : zero four words
+2: EX( stq_u $31, 0($16) ) # e0 : zero four words
subq $0, 8, $0 # .. e1 :
- EX( stq_u $31, 8($6) ) # e0 :
+ EX( stq_u $31, 8($16) ) # e0 :
subq $0, 8, $0 # .. e1 :
- EX( stq_u $31, 16($6) ) # e0 :
+ EX( stq_u $31, 16($16) ) # e0 :
subq $0, 8, $0 # .. e1 :
- EX( stq_u $31, 24($6) ) # e0 :
+ EX( stq_u $31, 24($16) ) # e0 :
subq $0, 8, $0 # .. e1 :
subq $1, 4, $1 # e0 :
- addq $6, 32, $6 # .. e1 :
+ addq $16, 32, $16 # .. e1 :
bne $1, 2b # e1 :
$tail:
bne $2, 1f # e1 : is there a tail to do?
- ret $31, ($28), 1 # .. e1 :
+ ret $31, ($26), 1 # .. e1 :
-1: EX( ldq_u $5, 0($6) ) # e0 :
+1: EX( ldq_u $5, 0($16) ) # e0 :
clr $0 # .. e1 :
nop # e1 :
mskqh $5, $0, $5 # e0 :
- EX( stq_u $5, 0($6) ) # e0 :
- ret $31, ($28), 1 # .. e1 :
+ EX( stq_u $5, 0($16) ) # e0 :
+ ret $31, ($26), 1 # .. e1 :
-__do_clear_user:
- and $6, 7, $4 # e0 : find dest misalignment
+__clear_user:
+ and $17, $17, $0
+ and $16, 7, $4 # e0 : find dest misalignment
beq $0, $zerolength # .. e1 :
addq $0, $4, $1 # e0 : bias counter
and $1, 7, $2 # e1 : number of bytes in tail
srl $1, 3, $1 # e0 :
beq $4, $loop # .. e1 :
- EX( ldq_u $5, 0($6) ) # e0 : load dst word to mask back in
+ EX( ldq_u $5, 0($16) ) # e0 : load dst word to mask back in
beq $1, $oneword # .. e1 : sub-word store?
- mskql $5, $6, $5 # e0 : take care of misaligned head
- addq $6, 8, $6 # .. e1 :
- EX( stq_u $5, -8($6) ) # e0 :
+ mskql $5, $16, $5 # e0 : take care of misaligned head
+ addq $16, 8, $16 # .. e1 :
+ EX( stq_u $5, -8($16) ) # e0 :
addq $0, $4, $0 # .. e1 : bytes left -= 8 - misalignment
subq $1, 1, $1 # e0 :
subq $0, 8, $0 # .. e1 :
@@ -101,15 +87,15 @@ __do_clear_user:
unop # :
$oneword:
- mskql $5, $6, $4 # e0 :
+ mskql $5, $16, $4 # e0 :
mskqh $5, $2, $5 # e0 :
or $5, $4, $5 # e1 :
- EX( stq_u $5, 0($6) ) # e0 :
+ EX( stq_u $5, 0($16) ) # e0 :
clr $0 # .. e1 :
$zerolength:
$exception:
- ret $31, ($28), 1 # .. e1 :
+ ret $31, ($26), 1 # .. e1 :
- .end __do_clear_user
- EXPORT_SYMBOL(__do_clear_user)
+ .end __clear_user
+ EXPORT_SYMBOL(__clear_user)