| /* |
| * linux/arch/arm/lib/io-writesw-armv4.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> |
| |
| .macro outword, rd |
| #ifndef __ARMEB__ |
| strh \rd, [r0] |
| mov \rd, \rd, lsr #16 |
| strh \rd, [r0] |
| #else |
| mov lr, \rd, lsr #16 |
| strh lr, [r0] |
| strh \rd, [r0] |
| #endif |
| .endm |
| |
| .Loutsw_align: movs ip, r1, lsl #31 |
| bne .Loutsw_noalign |
| |
| ldrh r3, [r1], #2 |
| sub r2, r2, #1 |
| strh r3, [r0] |
| |
| ENTRY(__raw_writesw) |
| teq r2, #0 |
| reteq lr |
| ands r3, r1, #3 |
| bne .Loutsw_align |
| |
| stmfd sp!, {r4, r5, lr} |
| |
| subs r2, r2, #8 |
| bmi .Lno_outsw_8 |
| |
| .Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} |
| subs r2, r2, #8 |
| outword r3 |
| outword r4 |
| outword r5 |
| outword ip |
| bpl .Loutsw_8_lp |
| |
| .Lno_outsw_8: tst r2, #4 |
| beq .Lno_outsw_4 |
| |
| ldmia r1!, {r3, ip} |
| outword r3 |
| outword ip |
| |
| .Lno_outsw_4: movs r2, r2, lsl #31 |
| bcc .Lno_outsw_2 |
| |
| ldr r3, [r1], #4 |
| outword r3 |
| |
| .Lno_outsw_2: ldrneh r3, [r1] |
| strneh r3, [r0] |
| |
| ldmfd sp!, {r4, r5, pc} |
| |
| #ifdef __ARMEB__ |
| #define pull_hbyte0 lsl #8 |
| #define push_hbyte1 lsr #24 |
| #else |
| #define pull_hbyte0 lsr #24 |
| #define push_hbyte1 lsl #8 |
| #endif |
| |
| .Loutsw_noalign: |
| ARM( ldr r3, [r1, -r3]! ) |
| THUMB( rsb r3, r3, #0 ) |
| THUMB( ldr r3, [r1, r3] ) |
| THUMB( sub r1, r3 ) |
| subcs r2, r2, #1 |
| bcs 2f |
| subs r2, r2, #2 |
| bmi 3f |
| |
| 1: mov ip, r3, lsr #8 |
| strh ip, [r0] |
| 2: mov ip, r3, pull_hbyte0 |
| ldr r3, [r1, #4]! |
| subs r2, r2, #2 |
| orr ip, ip, r3, push_hbyte1 |
| strh ip, [r0] |
| bpl 1b |
| |
| tst r2, #1 |
| 3: movne ip, r3, lsr #8 |
| strneh ip, [r0] |
| ret lr |
| ENDPROC(__raw_writesw) |