| | 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> |
| | 12 | |
| | 13 | ENTRY(__raw_readsl) |
| | 14 | teq r2, #0 @ do we have to check for the zero len? |
| | 15 | reteq lr |
| | 16 | ands ip, r1, #3 |
| | 17 | bne 3f |
| | 18 | |
| | 19 | subs r2, r2, #4 |
| | 20 | bmi 2f |
| | 21 | stmfd sp!, {r4, lr} |
| | 22 | 1: ldr r3, [r0, #0] |
| | 23 | ldr r4, [r0, #0] |
| | 24 | ldr ip, [r0, #0] |
| | 25 | ldr lr, [r0, #0] |
| | 26 | subs r2, r2, #4 |
| | 27 | stmia r1!, {r3, r4, ip, lr} |
| | 28 | bpl 1b |
| | 29 | ldmfd sp!, {r4, lr} |
| | 30 | 2: movs r2, r2, lsl #31 |
| | 31 | ldrcs r3, [r0, #0] |
| | 32 | ldrcs ip, [r0, #0] |
| | 33 | stmiacs r1!, {r3, ip} |
| | 34 | ldrne r3, [r0, #0] |
| | 35 | strne r3, [r1, #0] |
| | 36 | ret lr |
| | 37 | |
| | 38 | 3: ldr r3, [r0] |
| | 39 | cmp ip, #2 |
| | 40 | mov ip, r3, get_byte_0 |
| | 41 | strb ip, [r1], #1 |
| | 42 | bgt 6f |
| | 43 | mov ip, r3, get_byte_1 |
| | 44 | strb ip, [r1], #1 |
| | 45 | beq 5f |
| | 46 | mov ip, r3, get_byte_2 |
| | 47 | strb ip, [r1], #1 |
| | 48 | |
| | 49 | 4: subs r2, r2, #1 |
| | 50 | mov ip, r3, lspull #24 |
| | 51 | ldrne r3, [r0] |
| | 52 | orrne ip, ip, r3, lspush #8 |
| | 53 | strne ip, [r1], #4 |
| | 54 | bne 4b |
| | 55 | b 8f |
| | 56 | |
| | 57 | 5: subs r2, r2, #1 |
| | 58 | mov ip, r3, lspull #16 |
| | 59 | ldrne r3, [r0] |
| | 60 | orrne ip, ip, r3, lspush #16 |
| | 61 | strne ip, [r1], #4 |
| | 62 | bne 5b |
| | 63 | b 7f |
| | 64 | |
| | 65 | 6: subs r2, r2, #1 |
| | 66 | mov ip, r3, lspull #8 |
| | 67 | ldrne r3, [r0] |
| | 68 | orrne ip, ip, r3, lspush #24 |
| | 69 | strne ip, [r1], #4 |
| | 70 | bne 6b |
| | 71 | |
| | 72 | mov r3, ip, get_byte_2 |
| | 73 | strb r3, [r1, #2] |
| | 74 | 7: mov r3, ip, get_byte_1 |
| | 75 | strb r3, [r1, #1] |
| | 76 | 8: mov r3, ip, get_byte_0 |
| | 77 | strb r3, [r1, #0] |
| | 78 | ret lr |
| | 79 | ENDPROC(__raw_readsl) |
projects / linux-2.6-block.git / blame_incremental