122 lines
2.1 KiB
ArmAsm
122 lines
2.1 KiB
ArmAsm
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
/*
|
||
|
|
* arch/alpha/lib/copy_user.S
|
||
|
|
*
|
||
|
|
* Copy to/from user space, handling exceptions as we go.. This
|
||
|
|
* isn't exactly pretty.
|
||
|
|
*
|
||
|
|
* This is essentially the same as "memcpy()", but with a few twists.
|
||
|
|
* Notably, we have to make sure that $0 is always up-to-date and
|
||
|
|
* contains the right "bytes left to copy" value (and that it is updated
|
||
|
|
* only _after_ a successful copy). There is also some rather minor
|
||
|
|
* exception setup stuff..
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <asm/export.h>
|
||
|
|
|
||
|
|
/* Allow an exception for an insn; exit if we get one. */
|
||
|
|
#define EXI(x,y...) \
|
||
|
|
99: x,##y; \
|
||
|
|
.section __ex_table,"a"; \
|
||
|
|
.long 99b - .; \
|
||
|
|
lda $31, $exitin-99b($31); \
|
||
|
|
.previous
|
||
|
|
|
||
|
|
#define EXO(x,y...) \
|
||
|
|
99: x,##y; \
|
||
|
|
.section __ex_table,"a"; \
|
||
|
|
.long 99b - .; \
|
||
|
|
lda $31, $exitout-99b($31); \
|
||
|
|
.previous
|
||
|
|
|
||
|
|
.set noat
|
||
|
|
.align 4
|
||
|
|
.globl __copy_user
|
||
|
|
.ent __copy_user
|
||
|
|
__copy_user:
|
||
|
|
.prologue 0
|
||
|
|
mov $18,$0
|
||
|
|
and $16,7,$3
|
||
|
|
beq $0,$35
|
||
|
|
beq $3,$36
|
||
|
|
subq $3,8,$3
|
||
|
|
.align 4
|
||
|
|
$37:
|
||
|
|
EXI( ldq_u $1,0($17) )
|
||
|
|
EXO( ldq_u $2,0($16) )
|
||
|
|
extbl $1,$17,$1
|
||
|
|
mskbl $2,$16,$2
|
||
|
|
insbl $1,$16,$1
|
||
|
|
addq $3,1,$3
|
||
|
|
bis $1,$2,$1
|
||
|
|
EXO( stq_u $1,0($16) )
|
||
|
|
subq $0,1,$0
|
||
|
|
addq $16,1,$16
|
||
|
|
addq $17,1,$17
|
||
|
|
beq $0,$41
|
||
|
|
bne $3,$37
|
||
|
|
$36:
|
||
|
|
and $17,7,$1
|
||
|
|
bic $0,7,$4
|
||
|
|
beq $1,$43
|
||
|
|
beq $4,$48
|
||
|
|
EXI( ldq_u $3,0($17) )
|
||
|
|
.align 4
|
||
|
|
$50:
|
||
|
|
EXI( ldq_u $2,8($17) )
|
||
|
|
subq $4,8,$4
|
||
|
|
extql $3,$17,$3
|
||
|
|
extqh $2,$17,$1
|
||
|
|
bis $3,$1,$1
|
||
|
|
EXO( stq $1,0($16) )
|
||
|
|
addq $17,8,$17
|
||
|
|
subq $0,8,$0
|
||
|
|
addq $16,8,$16
|
||
|
|
bis $2,$2,$3
|
||
|
|
bne $4,$50
|
||
|
|
$48:
|
||
|
|
beq $0,$41
|
||
|
|
.align 4
|
||
|
|
$57:
|
||
|
|
EXI( ldq_u $1,0($17) )
|
||
|
|
EXO( ldq_u $2,0($16) )
|
||
|
|
extbl $1,$17,$1
|
||
|
|
mskbl $2,$16,$2
|
||
|
|
insbl $1,$16,$1
|
||
|
|
bis $1,$2,$1
|
||
|
|
EXO( stq_u $1,0($16) )
|
||
|
|
subq $0,1,$0
|
||
|
|
addq $16,1,$16
|
||
|
|
addq $17,1,$17
|
||
|
|
bne $0,$57
|
||
|
|
br $31,$41
|
||
|
|
.align 4
|
||
|
|
$43:
|
||
|
|
beq $4,$65
|
||
|
|
.align 4
|
||
|
|
$66:
|
||
|
|
EXI( ldq $1,0($17) )
|
||
|
|
subq $4,8,$4
|
||
|
|
EXO( stq $1,0($16) )
|
||
|
|
addq $17,8,$17
|
||
|
|
subq $0,8,$0
|
||
|
|
addq $16,8,$16
|
||
|
|
bne $4,$66
|
||
|
|
$65:
|
||
|
|
beq $0,$41
|
||
|
|
EXI( ldq $2,0($17) )
|
||
|
|
EXO( ldq $1,0($16) )
|
||
|
|
mskql $2,$0,$2
|
||
|
|
mskqh $1,$0,$1
|
||
|
|
bis $2,$1,$2
|
||
|
|
EXO( stq $2,0($16) )
|
||
|
|
bis $31,$31,$0
|
||
|
|
$41:
|
||
|
|
$35:
|
||
|
|
$exitin:
|
||
|
|
$exitout:
|
||
|
|
ret $31,($26),1
|
||
|
|
|
||
|
|
.end __copy_user
|
||
|
|
EXPORT_SYMBOL(__copy_user)
|