| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm26/lib/io-readsb.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 | #include <asm/hardware.h> |
| 13 | |
| 14 | .insb_align: rsb ip, ip, #4 |
| 15 | cmp ip, r2 |
| 16 | movgt ip, r2 |
| 17 | cmp ip, #2 |
| 18 | ldrb r3, [r0] |
| 19 | strb r3, [r1], #1 |
| 20 | ldrgeb r3, [r0] |
| 21 | strgeb r3, [r1], #1 |
| 22 | ldrgtb r3, [r0] |
| 23 | strgtb r3, [r1], #1 |
| 24 | subs r2, r2, ip |
| 25 | bne .insb_aligned |
| 26 | |
| 27 | ENTRY(__raw_readsb) |
| 28 | teq r2, #0 @ do we have to check for the zero len? |
| 29 | moveq pc, lr |
| 30 | ands ip, r1, #3 |
| 31 | bne .insb_align |
| 32 | |
| 33 | .insb_aligned: stmfd sp!, {r4 - r6, lr} |
| 34 | |
| 35 | subs r2, r2, #16 |
| 36 | bmi .insb_no_16 |
| 37 | |
| 38 | .insb_16_lp: ldrb r3, [r0] |
| 39 | ldrb r4, [r0] |
| 40 | orr r3, r3, r4, lsl #8 |
| 41 | ldrb r4, [r0] |
| 42 | orr r3, r3, r4, lsl #16 |
| 43 | ldrb r4, [r0] |
| 44 | orr r3, r3, r4, lsl #24 |
| 45 | ldrb r4, [r0] |
| 46 | ldrb r5, [r0] |
| 47 | orr r4, r4, r5, lsl #8 |
| 48 | ldrb r5, [r0] |
| 49 | orr r4, r4, r5, lsl #16 |
| 50 | ldrb r5, [r0] |
| 51 | orr r4, r4, r5, lsl #24 |
| 52 | ldrb r5, [r0] |
| 53 | ldrb r6, [r0] |
| 54 | orr r5, r5, r6, lsl #8 |
| 55 | ldrb r6, [r0] |
| 56 | orr r5, r5, r6, lsl #16 |
| 57 | ldrb r6, [r0] |
| 58 | orr r5, r5, r6, lsl #24 |
| 59 | ldrb r6, [r0] |
| 60 | ldrb ip, [r0] |
| 61 | orr r6, r6, ip, lsl #8 |
| 62 | ldrb ip, [r0] |
| 63 | orr r6, r6, ip, lsl #16 |
| 64 | ldrb ip, [r0] |
| 65 | orr r6, r6, ip, lsl #24 |
| 66 | stmia r1!, {r3 - r6} |
| 67 | |
| 68 | subs r2, r2, #16 |
| 69 | bpl .insb_16_lp |
| 70 | |
| 71 | tst r2, #15 |
| 72 | LOADREGS(eqfd, sp!, {r4 - r6, pc}) |
| 73 | |
| 74 | .insb_no_16: tst r2, #8 |
| 75 | beq .insb_no_8 |
| 76 | |
| 77 | ldrb r3, [r0] |
| 78 | ldrb r4, [r0] |
| 79 | orr r3, r3, r4, lsl #8 |
| 80 | ldrb r4, [r0] |
| 81 | orr r3, r3, r4, lsl #16 |
| 82 | ldrb r4, [r0] |
| 83 | orr r3, r3, r4, lsl #24 |
| 84 | ldrb r4, [r0] |
| 85 | ldrb r5, [r0] |
| 86 | orr r4, r4, r5, lsl #8 |
| 87 | ldrb r5, [r0] |
| 88 | orr r4, r4, r5, lsl #16 |
| 89 | ldrb r5, [r0] |
| 90 | orr r4, r4, r5, lsl #24 |
| 91 | stmia r1!, {r3, r4} |
| 92 | |
| 93 | .insb_no_8: tst r2, #4 |
| 94 | beq .insb_no_4 |
| 95 | |
| 96 | ldrb r3, [r0] |
| 97 | ldrb r4, [r0] |
| 98 | orr r3, r3, r4, lsl #8 |
| 99 | ldrb r4, [r0] |
| 100 | orr r3, r3, r4, lsl #16 |
| 101 | ldrb r4, [r0] |
| 102 | orr r3, r3, r4, lsl #24 |
| 103 | str r3, [r1], #4 |
| 104 | |
| 105 | .insb_no_4: ands r2, r2, #3 |
| 106 | LOADREGS(eqfd, sp!, {r4 - r6, pc}) |
| 107 | |
| 108 | cmp r2, #2 |
| 109 | ldrb r3, [r0] |
| 110 | strb r3, [r1], #1 |
| 111 | ldrgeb r3, [r0] |
| 112 | strgeb r3, [r1], #1 |
| 113 | ldrgtb r3, [r0] |
| 114 | strgtb r3, [r1] |
| 115 | |
| 116 | LOADREGS(fd, sp!, {r4 - r6, pc}) |