1/* 2 * linux/arch/arm/lib/io-writesw-armv4.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 .macro outword, rd 14#ifndef __ARMEB__ 15 strh \rd, [r0] 16 mov \rd, \rd, lsr #16 17 strh \rd, [r0] 18#else 19 mov lr, \rd, lsr #16 20 strh lr, [r0] 21 strh \rd, [r0] 22#endif 23 .endm 24 25.Loutsw_align: movs ip, r1, lsl #31 26 bne .Loutsw_noalign 27 28 ldrh r3, [r1], #2 29 sub r2, r2, #1 30 strh r3, [r0] 31 32ENTRY(__raw_writesw) 33 teq r2, #0 34 reteq lr 35 ands r3, r1, #3 36 bne .Loutsw_align 37 38 stmfd sp!, {r4, r5, lr} 39 40 subs r2, r2, #8 41 bmi .Lno_outsw_8 42 43.Loutsw_8_lp: ldmia r1!, {r3, r4, r5, ip} 44 subs r2, r2, #8 45 outword r3 46 outword r4 47 outword r5 48 outword ip 49 bpl .Loutsw_8_lp 50 51.Lno_outsw_8: tst r2, #4 52 beq .Lno_outsw_4 53 54 ldmia r1!, {r3, ip} 55 outword r3 56 outword ip 57 58.Lno_outsw_4: movs r2, r2, lsl #31 59 bcc .Lno_outsw_2 60 61 ldr r3, [r1], #4 62 outword r3 63 64.Lno_outsw_2: ldrneh r3, [r1] 65 strneh r3, [r0] 66 67 ldmfd sp!, {r4, r5, pc} 68 69#ifdef __ARMEB__ 70#define pull_hbyte0 lsl #8 71#define push_hbyte1 lsr #24 72#else 73#define pull_hbyte0 lsr #24 74#define push_hbyte1 lsl #8 75#endif 76 77.Loutsw_noalign: 78 ARM( ldr r3, [r1, -r3]! ) 79 THUMB( rsb r3, r3, #0 ) 80 THUMB( ldr r3, [r1, r3] ) 81 THUMB( sub r1, r3 ) 82 subcs r2, r2, #1 83 bcs 2f 84 subs r2, r2, #2 85 bmi 3f 86 871: mov ip, r3, lsr #8 88 strh ip, [r0] 892: mov ip, r3, pull_hbyte0 90 ldr r3, [r1, #4]! 91 subs r2, r2, #2 92 orr ip, ip, r3, push_hbyte1 93 strh ip, [r0] 94 bpl 1b 95 96 tst r2, #1 973: movne ip, r3, lsr #8 98 strneh ip, [r0] 99 ret lr 100ENDPROC(__raw_writesw) 101