projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 1da177e4 LT |
2 | /* |
| 3 | * arch/alpha/lib/copy_user.S | |
| 4 | * | |
| 5 | * Copy to/from user space, handling exceptions as we go.. This | |
| 6 | * isn't exactly pretty. | |
| 7 | * | |
| 8 | * This is essentially the same as "memcpy()", but with a few twists. | |
| 9 | * Notably, we have to make sure that $0 is always up-to-date and | |
| 10 | * contains the right "bytes left to copy" value (and that it is updated | |
| 11 | * only _after_ a successful copy). There is also some rather minor | |
| 12 | * exception setup stuff.. | |
| 1da177e4 LT |
13 | */ |
| 14 | ||
| 00fc0e0d AV |
15 | #include <asm/export.h> |
| 16 | ||
| 1da177e4 LT |
17 | /* Allow an exception for an insn; exit if we get one. */ |
| 18 | #define EXI(x,y...) \ | |
| 19 | 99: x,##y; \ | |
| 20 | .section __ex_table,"a"; \ | |
| 21 | .long 99b - .; \ | |
| 22 | lda $31, $exitin-99b($31); \ | |
| 23 | .previous | |
| 24 | ||
| 25 | #define EXO(x,y...) \ | |
| 26 | 99: x,##y; \ | |
| 27 | .section __ex_table,"a"; \ | |
| 28 | .long 99b - .; \ | |
| 29 | lda $31, $exitout-99b($31); \ | |
| 30 | .previous | |
| 31 | ||
| 32 | .set noat | |
| 33 | .align 4 | |
| 34 | .globl __copy_user | |
| 35 | .ent __copy_user | |
| 36 | __copy_user: | |
| 37 | .prologue 0 | |
| 4606f68f | 38 | mov $18,$0 |
| 85250231 | 39 | and $16,7,$3 |
| 1da177e4 LT |
40 | beq $0,$35 |
| 41 | beq $3,$36 | |
| 42 | subq $3,8,$3 | |
| 43 | .align 4 | |
| 44 | $37: | |
| 85250231 AV |
45 | EXI( ldq_u $1,0($17) ) |
| 46 | EXO( ldq_u $2,0($16) ) | |
| 47 | extbl $1,$17,$1 | |
| 48 | mskbl $2,$16,$2 | |
| 49 | insbl $1,$16,$1 | |
| 1da177e4 LT |
50 | addq $3,1,$3 |
| 51 | bis $1,$2,$1 | |
| 85250231 | 52 | EXO( stq_u $1,0($16) ) |
| 1da177e4 | 53 | subq $0,1,$0 |
| 85250231 AV |
54 | addq $16,1,$16 |
| 55 | addq $17,1,$17 | |
| 1da177e4 LT |
56 | beq $0,$41 |
| 57 | bne $3,$37 | |
| 58 | $36: | |
| 85250231 | 59 | and $17,7,$1 |
| 1da177e4 LT |
60 | bic $0,7,$4 |
| 61 | beq $1,$43 | |
| 62 | beq $4,$48 | |
| 85250231 | 63 | EXI( ldq_u $3,0($17) ) |
| 1da177e4 LT |
64 | .align 4 |
| 65 | $50: | |
| 85250231 | 66 | EXI( ldq_u $2,8($17) ) |
| 1da177e4 | 67 | subq $4,8,$4 |
| 85250231 AV |
68 | extql $3,$17,$3 |
| 69 | extqh $2,$17,$1 | |
| 1da177e4 | 70 | bis $3,$1,$1 |
| 85250231 AV |
71 | EXO( stq $1,0($16) ) |
| 72 | addq $17,8,$17 | |
| 1da177e4 | 73 | subq $0,8,$0 |
| 85250231 | 74 | addq $16,8,$16 |
| 1da177e4 LT |
75 | bis $2,$2,$3 |
| 76 | bne $4,$50 | |
| 77 | $48: | |
| 78 | beq $0,$41 | |
| 79 | .align 4 | |
| 80 | $57: | |
| 85250231 AV |
81 | EXI( ldq_u $1,0($17) ) |
| 82 | EXO( ldq_u $2,0($16) ) | |
| 83 | extbl $1,$17,$1 | |
| 84 | mskbl $2,$16,$2 | |
| 85 | insbl $1,$16,$1 | |
| 1da177e4 | 86 | bis $1,$2,$1 |
| 85250231 | 87 | EXO( stq_u $1,0($16) ) |
| 1da177e4 | 88 | subq $0,1,$0 |
| 85250231 AV |
89 | addq $16,1,$16 |
| 90 | addq $17,1,$17 | |
| 1da177e4 LT |
91 | bne $0,$57 |
| 92 | br $31,$41 | |
| 93 | .align 4 | |
| 94 | $43: | |
| 95 | beq $4,$65 | |
| 96 | .align 4 | |
| 97 | $66: | |
| 85250231 | 98 | EXI( ldq $1,0($17) ) |
| 1da177e4 | 99 | subq $4,8,$4 |
| 85250231 AV |
100 | EXO( stq $1,0($16) ) |
| 101 | addq $17,8,$17 | |
| 1da177e4 | 102 | subq $0,8,$0 |
| 85250231 | 103 | addq $16,8,$16 |
| 1da177e4 LT |
104 | bne $4,$66 |
| 105 | $65: | |
| 106 | beq $0,$41 | |
| 85250231 AV |
107 | EXI( ldq $2,0($17) ) |
| 108 | EXO( ldq $1,0($16) ) | |
| 1da177e4 LT |
109 | mskql $2,$0,$2 |
| 110 | mskqh $1,$0,$1 | |
| 111 | bis $2,$1,$2 | |
| 85250231 | 112 | EXO( stq $2,0($16) ) |
| 1da177e4 LT |
113 | bis $31,$31,$0 |
| 114 | $41: | |
| 115 | $35: | |
| 1da177e4 | 116 | $exitin: |
| 085354f9 | 117 | $exitout: |
| 85250231 | 118 | ret $31,($26),1 |
| 1da177e4 LT |
119 | |
| 120 | .end __copy_user | |
| 00fc0e0d | 121 | EXPORT_SYMBOL(__copy_user) |