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