| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/lib/io-readsw-armv3.S |
| 3 | * |
| 4 | * Copyright (C) 1995-2000 Russell King |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/linkage.h> |
| 11 | #include <asm/assembler.h> |
| 12 | |
| 13 | .Linsw_bad_alignment: |
| 14 | adr r0, .Linsw_bad_align_msg |
| 15 | mov r2, lr |
| 16 | b panic |
| 17 | .Linsw_bad_align_msg: |
| 18 | .asciz "insw: bad buffer alignment (0x%p, lr=0x%08lX)\n" |
| 19 | .align |
| 20 | |
| 21 | .Linsw_align: tst r1, #1 |
| 22 | bne .Linsw_bad_alignment |
| 23 | |
| 24 | ldr r3, [r0] |
| 25 | strb r3, [r1], #1 |
| 26 | mov r3, r3, lsr #8 |
| 27 | strb r3, [r1], #1 |
| 28 | |
| 29 | subs r2, r2, #1 |
| 30 | reteq lr |
| 31 | |
| 32 | ENTRY(__raw_readsw) |
| 33 | teq r2, #0 @ do we have to check for the zero len? |
| 34 | reteq lr |
| 35 | tst r1, #3 |
| 36 | bne .Linsw_align |
| 37 | |
| 38 | .Linsw_aligned: mov ip, #0xff |
| 39 | orr ip, ip, ip, lsl #8 |
| 40 | stmfd sp!, {r4, r5, r6, lr} |
| 41 | |
| 42 | subs r2, r2, #8 |
| 43 | bmi .Lno_insw_8 |
| 44 | |
| 45 | .Linsw_8_lp: ldr r3, [r0] |
| 46 | and r3, r3, ip |
| 47 | ldr r4, [r0] |
| 48 | orr r3, r3, r4, lsl #16 |
| 49 | |
| 50 | ldr r4, [r0] |
| 51 | and r4, r4, ip |
| 52 | ldr r5, [r0] |
| 53 | orr r4, r4, r5, lsl #16 |
| 54 | |
| 55 | ldr r5, [r0] |
| 56 | and r5, r5, ip |
| 57 | ldr r6, [r0] |
| 58 | orr r5, r5, r6, lsl #16 |
| 59 | |
| 60 | ldr r6, [r0] |
| 61 | and r6, r6, ip |
| 62 | ldr lr, [r0] |
| 63 | orr r6, r6, lr, lsl #16 |
| 64 | |
| 65 | stmia r1!, {r3 - r6} |
| 66 | |
| 67 | subs r2, r2, #8 |
| 68 | bpl .Linsw_8_lp |
| 69 | |
| 70 | tst r2, #7 |
| 71 | ldmeqfd sp!, {r4, r5, r6, pc} |
| 72 | |
| 73 | .Lno_insw_8: tst r2, #4 |
| 74 | beq .Lno_insw_4 |
| 75 | |
| 76 | ldr r3, [r0] |
| 77 | and r3, r3, ip |
| 78 | ldr r4, [r0] |
| 79 | orr r3, r3, r4, lsl #16 |
| 80 | |
| 81 | ldr r4, [r0] |
| 82 | and r4, r4, ip |
| 83 | ldr r5, [r0] |
| 84 | orr r4, r4, r5, lsl #16 |
| 85 | |
| 86 | stmia r1!, {r3, r4} |
| 87 | |
| 88 | .Lno_insw_4: tst r2, #2 |
| 89 | beq .Lno_insw_2 |
| 90 | |
| 91 | ldr r3, [r0] |
| 92 | and r3, r3, ip |
| 93 | ldr r4, [r0] |
| 94 | orr r3, r3, r4, lsl #16 |
| 95 | |
| 96 | str r3, [r1], #4 |
| 97 | |
| 98 | .Lno_insw_2: tst r2, #1 |
| 99 | ldrne r3, [r0] |
| 100 | strneb r3, [r1], #1 |
| 101 | movne r3, r3, lsr #8 |
| 102 | strneb r3, [r1] |
| 103 | |
| 104 | ldmfd sp!, {r4, r5, r6, pc} |
| 105 | |
| 106 | |