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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | /* * linux/arch/arm/lib/io-readsw-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 pack, rd, hw1, hw2 #ifndef __ARMEB__ orr \rd, \hw1, \hw2, lsl #16 #else orr \rd, \hw2, \hw1, lsl #16 #endif .endm .Linsw_align: movs ip, r1, lsl #31 bne .Linsw_noalign ldrh ip, [r0] sub r2, r2, #1 strh ip, [r1], #2 ENTRY(__raw_readsw) teq r2, #0 moveq pc, lr tst r1, #3 bne .Linsw_align stmfd sp!, {r4, r5, lr} subs r2, r2, #8 bmi .Lno_insw_8 .Linsw_8_lp: ldrh r3, [r0] ldrh r4, [r0] pack r3, r3, r4 ldrh r4, [r0] ldrh r5, [r0] pack r4, r4, r5 ldrh r5, [r0] ldrh ip, [r0] pack r5, r5, ip ldrh ip, [r0] ldrh lr, [r0] pack ip, ip, lr subs r2, r2, #8 stmia r1!, {r3 - r5, ip} bpl .Linsw_8_lp .Lno_insw_8: tst r2, #4 beq .Lno_insw_4 ldrh r3, [r0] ldrh r4, [r0] pack r3, r3, r4 ldrh r4, [r0] ldrh ip, [r0] pack r4, r4, ip stmia r1!, {r3, r4} .Lno_insw_4: movs r2, r2, lsl #31 bcc .Lno_insw_2 ldrh r3, [r0] ldrh ip, [r0] pack r3, r3, ip str r3, [r1], #4 .Lno_insw_2: ldrneh r3, [r0] strneh r3, [r1] ldmfd sp!, {r4, r5, pc} #ifdef __ARMEB__ #define _BE_ONLY_(code...) code #define _LE_ONLY_(code...) #define push_hbyte0 lsr #8 #define pull_hbyte1 lsl #24 #else #define _BE_ONLY_(code...) #define _LE_ONLY_(code...) code #define push_hbyte0 lsl #24 #define pull_hbyte1 lsr #8 #endif .Linsw_noalign: stmfd sp!, {r4, lr} ldrccb ip, [r1, #-1]! bcc 1f ldrh ip, [r0] sub r2, r2, #1 _BE_ONLY_( mov ip, ip, ror #8 ) strb ip, [r1], #1 _LE_ONLY_( mov ip, ip, lsr #8 ) _BE_ONLY_( mov ip, ip, lsr #24 ) 1: subs r2, r2, #2 bmi 3f _BE_ONLY_( mov ip, ip, lsl #24 ) 2: ldrh r3, [r0] ldrh r4, [r0] subs r2, r2, #2 orr ip, ip, r3, lsl #8 orr ip, ip, r4, push_hbyte0 str ip, [r1], #4 mov ip, r4, pull_hbyte1 bpl 2b _BE_ONLY_( mov ip, ip, lsr #24 ) 3: tst r2, #1 strb ip, [r1], #1 ldrneh ip, [r0] _BE_ONLY_( movne ip, ip, ror #8 ) strneb ip, [r1], #1 _LE_ONLY_( movne ip, ip, lsr #8 ) _BE_ONLY_( movne ip, ip, lsr #24 ) strneb ip, [r1] ldmfd sp!, {r4, pc} ENDPROC(__raw_readsw) |