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| /* 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)
|
|
