/* 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 <linux/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_userEXPORT_SYMBOL(__copy_user)