projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 1da177e4 LT |
2 | /* |
| 3 | * linux/arch/arm/lib/io-readsw-armv4.S | |
| 4 | * | |
| 5 | * Copyright (C) 1995-2000 Russell King | |
| 1da177e4 LT |
6 | */ |
| 7 | #include <linux/linkage.h> | |
| 8 | #include <asm/assembler.h> | |
| 9 | ||
| 10 | .macro pack, rd, hw1, hw2 | |
| 11 | #ifndef __ARMEB__ | |
| 12 | orr \rd, \hw1, \hw2, lsl #16 | |
| 13 | #else | |
| 14 | orr \rd, \hw2, \hw1, lsl #16 | |
| 15 | #endif | |
| 16 | .endm | |
| 17 | ||
| a9c4814d NP |
18 | .Linsw_align: movs ip, r1, lsl #31 |
| 19 | bne .Linsw_noalign | |
| 1da177e4 LT |
20 | ldrh ip, [r0] |
| 21 | sub r2, r2, #1 | |
| 22 | strh ip, [r1], #2 | |
| 23 | ||
| 24 | ENTRY(__raw_readsw) | |
| 25 | teq r2, #0 | |
| 6ebbf2ce | 26 | reteq lr |
| 1da177e4 | 27 | tst r1, #3 |
| a9c4814d | 28 | bne .Linsw_align |
| 1da177e4 LT |
29 | |
| 30 | stmfd sp!, {r4, r5, lr} | |
| 31 | ||
| 32 | subs r2, r2, #8 | |
| a9c4814d | 33 | bmi .Lno_insw_8 |
| 1da177e4 | 34 | |
| a9c4814d | 35 | .Linsw_8_lp: ldrh r3, [r0] |
| 1da177e4 LT |
36 | ldrh r4, [r0] |
| 37 | pack r3, r3, r4 | |
| 38 | ||
| 39 | ldrh r4, [r0] | |
| 40 | ldrh r5, [r0] | |
| 41 | pack r4, r4, r5 | |
| 42 | ||
| 43 | ldrh r5, [r0] | |
| 44 | ldrh ip, [r0] | |
| 45 | pack r5, r5, ip | |
| 46 | ||
| 47 | ldrh ip, [r0] | |
| 48 | ldrh lr, [r0] | |
| 49 | pack ip, ip, lr | |
| 50 | ||
| 51 | subs r2, r2, #8 | |
| 52 | stmia r1!, {r3 - r5, ip} | |
| a9c4814d | 53 | bpl .Linsw_8_lp |
| 1da177e4 | 54 | |
| a9c4814d NP |
55 | .Lno_insw_8: tst r2, #4 |
| 56 | beq .Lno_insw_4 | |
| 1da177e4 LT |
57 | |
| 58 | ldrh r3, [r0] | |
| 59 | ldrh r4, [r0] | |
| 60 | pack r3, r3, r4 | |
| 61 | ||
| 62 | ldrh r4, [r0] | |
| 63 | ldrh ip, [r0] | |
| 64 | pack r4, r4, ip | |
| 65 | ||
| 66 | stmia r1!, {r3, r4} | |
| 67 | ||
| a9c4814d NP |
68 | .Lno_insw_4: movs r2, r2, lsl #31 |
| 69 | bcc .Lno_insw_2 | |
| 1da177e4 LT |
70 | |
| 71 | ldrh r3, [r0] | |
| 72 | ldrh ip, [r0] | |
| 73 | pack r3, r3, ip | |
| 74 | str r3, [r1], #4 | |
| 75 | ||
| e44fc388 SA |
76 | .Lno_insw_2: ldrhne r3, [r0] |
| 77 | strhne r3, [r1] | |
| 1da177e4 LT |
78 | |
| 79 | ldmfd sp!, {r4, r5, pc} | |
| 80 | ||
| 81 | #ifdef __ARMEB__ | |
| 82 | #define _BE_ONLY_(code...) code | |
| 83 | #define _LE_ONLY_(code...) | |
| 84 | #define push_hbyte0 lsr #8 | |
| 85 | #define pull_hbyte1 lsl #24 | |
| 86 | #else | |
| 87 | #define _BE_ONLY_(code...) | |
| 88 | #define _LE_ONLY_(code...) code | |
| 89 | #define push_hbyte0 lsl #24 | |
| 90 | #define pull_hbyte1 lsr #8 | |
| 91 | #endif | |
| 92 | ||
| a9c4814d | 93 | .Linsw_noalign: stmfd sp!, {r4, lr} |
| e44fc388 | 94 | ldrbcc ip, [r1, #-1]! |
| 1da177e4 LT |
95 | bcc 1f |
| 96 | ||
| 97 | ldrh ip, [r0] | |
| 98 | sub r2, r2, #1 | |
| 99 | _BE_ONLY_( mov ip, ip, ror #8 ) | |
| 100 | strb ip, [r1], #1 | |
| 101 | _LE_ONLY_( mov ip, ip, lsr #8 ) | |
| 102 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
| 103 | ||
| 104 | 1: subs r2, r2, #2 | |
| 105 | bmi 3f | |
| 106 | _BE_ONLY_( mov ip, ip, lsl #24 ) | |
| 107 | ||
| 108 | 2: ldrh r3, [r0] | |
| 109 | ldrh r4, [r0] | |
| 110 | subs r2, r2, #2 | |
| 111 | orr ip, ip, r3, lsl #8 | |
| 112 | orr ip, ip, r4, push_hbyte0 | |
| 113 | str ip, [r1], #4 | |
| 114 | mov ip, r4, pull_hbyte1 | |
| 115 | bpl 2b | |
| 116 | ||
| 117 | _BE_ONLY_( mov ip, ip, lsr #24 ) | |
| 118 | ||
| 119 | 3: tst r2, #1 | |
| 120 | strb ip, [r1], #1 | |
| e44fc388 | 121 | ldrhne ip, [r0] |
| 1da177e4 | 122 | _BE_ONLY_( movne ip, ip, ror #8 ) |
| e44fc388 | 123 | strbne ip, [r1], #1 |
| 1da177e4 LT |
124 | _LE_ONLY_( movne ip, ip, lsr #8 ) |
| 125 | _BE_ONLY_( movne ip, ip, lsr #24 ) | |
| e44fc388 | 126 | strbne ip, [r1] |
| 1da177e4 | 127 | ldmfd sp!, {r4, pc} |
| 93ed3970 | 128 | ENDPROC(__raw_readsw) |