| /* |
| * linux/arch/arm/lib/io-readsl.S |
| * |
| * Copyright (C) 1995-2000 Russell King |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| #include <linux/linkage.h> |
| #include <asm/assembler.h> |
| |
| ENTRY(__raw_readsl) |
| teq r2, #0 @ do we have to check for the zero len? |
| moveq pc, lr |
| ands ip, r1, #3 |
| bne 3f |
| |
| subs r2, r2, #4 |
| bmi 2f |
| stmfd sp!, {r4, lr} |
| 1: ldr r3, [r0, #0] |
| ldr r4, [r0, #0] |
| ldr ip, [r0, #0] |
| ldr lr, [r0, #0] |
| subs r2, r2, #4 |
| stmia r1!, {r3, r4, ip, lr} |
| bpl 1b |
| ldmfd sp!, {r4, lr} |
| 2: movs r2, r2, lsl #31 |
| ldrcs r3, [r0, #0] |
| ldrcs ip, [r0, #0] |
| stmcsia r1!, {r3, ip} |
| ldrne r3, [r0, #0] |
| strne r3, [r1, #0] |
| mov pc, lr |
| |
| 3: ldr r3, [r0] |
| cmp ip, #2 |
| mov ip, r3, get_byte_0 |
| strb ip, [r1], #1 |
| bgt 6f |
| mov ip, r3, get_byte_1 |
| strb ip, [r1], #1 |
| beq 5f |
| mov ip, r3, get_byte_2 |
| strb ip, [r1], #1 |
| |
| 4: subs r2, r2, #1 |
| mov ip, r3, pull #24 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, push #8 |
| strne ip, [r1], #4 |
| bne 4b |
| b 8f |
| |
| 5: subs r2, r2, #1 |
| mov ip, r3, pull #16 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, push #16 |
| strne ip, [r1], #4 |
| bne 5b |
| b 7f |
| |
| 6: subs r2, r2, #1 |
| mov ip, r3, pull #8 |
| ldrne r3, [r0] |
| orrne ip, ip, r3, push #24 |
| strne ip, [r1], #4 |
| bne 6b |
| |
| mov r3, ip, get_byte_2 |
| strb r3, [r1, #2] |
| 7: mov r3, ip, get_byte_1 |
| strb r3, [r1, #1] |
| 8: mov r3, ip, get_byte_0 |
| strb r3, [r1, #0] |
| mov pc, lr |