projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * linux/arch/arm/lib/io-readsl.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> | |
| 4dd1837d | 12 | #include <asm/export.h> |
| 1da177e4 LT |
13 | |
| 14 | ENTRY(__raw_readsl) | |
| 15 | teq r2, #0 @ do we have to check for the zero len? | |
| 6ebbf2ce | 16 | reteq lr |
| 1da177e4 LT |
17 | ands ip, r1, #3 |
| 18 | bne 3f | |
| 19 | ||
| 20 | subs r2, r2, #4 | |
| 21 | bmi 2f | |
| 22 | stmfd sp!, {r4, lr} | |
| 23 | 1: ldr r3, [r0, #0] | |
| 24 | ldr r4, [r0, #0] | |
| 25 | ldr ip, [r0, #0] | |
| 26 | ldr lr, [r0, #0] | |
| 27 | subs r2, r2, #4 | |
| 28 | stmia r1!, {r3, r4, ip, lr} | |
| 29 | bpl 1b | |
| 30 | ldmfd sp!, {r4, lr} | |
| 31 | 2: movs r2, r2, lsl #31 | |
| 32 | ldrcs r3, [r0, #0] | |
| 33 | ldrcs ip, [r0, #0] | |
| 34 | stmcsia r1!, {r3, ip} | |
| 35 | ldrne r3, [r0, #0] | |
| 36 | strne r3, [r1, #0] | |
| 6ebbf2ce | 37 | ret lr |
| 1da177e4 LT |
38 | |
| 39 | 3: ldr r3, [r0] | |
| 40 | cmp ip, #2 | |
| 41 | mov ip, r3, get_byte_0 | |
| 42 | strb ip, [r1], #1 | |
| 43 | bgt 6f | |
| 44 | mov ip, r3, get_byte_1 | |
| 45 | strb ip, [r1], #1 | |
| 46 | beq 5f | |
| 47 | mov ip, r3, get_byte_2 | |
| 48 | strb ip, [r1], #1 | |
| 49 | ||
| 50 | 4: subs r2, r2, #1 | |
| d98b90ea | 51 | mov ip, r3, lspull #24 |
| 1da177e4 | 52 | ldrne r3, [r0] |
| d98b90ea | 53 | orrne ip, ip, r3, lspush #8 |
| 1da177e4 LT |
54 | strne ip, [r1], #4 |
| 55 | bne 4b | |
| 56 | b 8f | |
| 57 | ||
| 58 | 5: subs r2, r2, #1 | |
| d98b90ea | 59 | mov ip, r3, lspull #16 |
| 1da177e4 | 60 | ldrne r3, [r0] |
| d98b90ea | 61 | orrne ip, ip, r3, lspush #16 |
| 1da177e4 LT |
62 | strne ip, [r1], #4 |
| 63 | bne 5b | |
| 64 | b 7f | |
| 65 | ||
| 66 | 6: subs r2, r2, #1 | |
| d98b90ea | 67 | mov ip, r3, lspull #8 |
| 1da177e4 | 68 | ldrne r3, [r0] |
| d98b90ea | 69 | orrne ip, ip, r3, lspush #24 |
| 1da177e4 LT |
70 | strne ip, [r1], #4 |
| 71 | bne 6b | |
| 72 | ||
| 73 | mov r3, ip, get_byte_2 | |
| 74 | strb r3, [r1, #2] | |
| 75 | 7: mov r3, ip, get_byte_1 | |
| 76 | strb r3, [r1, #1] | |
| 77 | 8: mov r3, ip, get_byte_0 | |
| 78 | strb r3, [r1, #0] | |
| 6ebbf2ce | 79 | ret lr |
| 93ed3970 | 80 | ENDPROC(__raw_readsl) |
| 4dd1837d | 81 | EXPORT_SYMBOL(__raw_readsl) |