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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 553 | serge | 1 | /**************************************************************************** |
| 2 | * |
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| 3 | * Open Watcom Project |
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| 4 | * |
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| 5 | * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
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| 6 | * |
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| 7 | * ======================================================================== |
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| 8 | * |
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| 9 | * This file contains Original Code and/or Modifications of Original |
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| 10 | * Code as defined in and that are subject to the Sybase Open Watcom |
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| 11 | * Public License version 1.0 (the 'License'). You may not use this file |
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| 12 | * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
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| 13 | * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
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| 14 | * provided with the Original Code and Modifications, and is also |
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| 15 | * available at www.sybase.com/developer/opensource. |
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| 16 | * |
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| 17 | * The Original Code and all software distributed under the License are |
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| 18 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
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| 19 | * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
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| 20 | * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
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| 21 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
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| 22 | * NON-INFRINGEMENT. Please see the License for the specific language |
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| 23 | * governing rights and limitations under the License. |
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| 24 | * |
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| 25 | * ======================================================================== |
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| 26 | * |
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| 27 | * Description: WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE |
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| 28 | * DESCRIBE IT HERE! |
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| 29 | * |
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| 30 | ****************************************************************************/ |
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| 31 | |||
| 32 | |||
| 33 | #include "variety.h" |
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| 34 | #include |
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| 35 | #include |
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| 36 | |||
| 37 | #if defined(__386__) |
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| 38 | |||
| 39 | #if defined(__FLAT__) |
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| 40 | extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 41 | #pragma aux movefwd = \ |
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| 42 | 0x06 /* push es */\ |
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| 43 | 0x8e 0xc2 /* mov es,dx */\ |
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| 44 | 0x1e /* push ds */\ |
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| 45 | 0x96 /* xchg esi,eax */\ |
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| 46 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 47 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 48 | 0x66 0xf3 0xa5 /* rep movsw */\ |
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| 49 | 0x11 0xc9 /* adc cx,cx */\ |
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| 50 | 0xf3 0xa4 /* rep movsb */\ |
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| 51 | 0x1f /* pop ds */\ |
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| 52 | 0x07 /* pop es */\ |
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| 53 | parm [dx edi] [si eax] [ecx] \ |
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| 54 | modify exact [edi esi ecx eax]; |
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| 55 | #else |
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| 56 | extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 57 | #pragma aux movefwd = \ |
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| 58 | 0x1e /* push ds */\ |
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| 59 | 0x96 /* xchg esi,eax */\ |
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| 60 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 61 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 62 | 0x66 0xf3 0xa5 /* rep movsw */\ |
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| 63 | 0x11 0xc9 /* adc cx,cx */\ |
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| 64 | 0xf3 0xa4 /* rep movsb */\ |
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| 65 | 0x1f /* pop ds */\ |
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| 66 | parm [es edi] [si eax] [ecx] \ |
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| 67 | modify exact [edi esi ecx eax]; |
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| 68 | #endif |
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| 69 | |||
| 70 | #elif defined(M_I86) |
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| 71 | #if defined(__SMALL_DATA__) |
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| 72 | extern void movebwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 73 | #pragma aux movebwd = \ |
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| 74 | 0xfd /* std */\ |
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| 75 | 0x1e /* push ds */\ |
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| 76 | 0x96 /* xchg si,ax */\ |
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| 77 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 78 | 0x4e /* dec si */\ |
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| 79 | 0x4f /* dec di */\ |
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| 80 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 81 | 0xf3 0xa5 /* rep movsw */\ |
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| 82 | 0x11 0xc9 /* adc cx,cx */\ |
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| 83 | 0x46 /* inc si */\ |
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| 84 | 0x47 /* inc di */\ |
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| 85 | 0xf3 0xa4 /* rep movsb */\ |
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| 86 | 0xfc /* cld */\ |
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| 87 | 0x1f /* pop ds */\ |
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| 88 | parm [es di] [si ax] [cx] \ |
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| 89 | modify exact [di si cx ax]; |
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| 90 | |||
| 91 | extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 92 | #pragma aux movefwd = \ |
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| 93 | 0x1e /* push ds */\ |
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| 94 | 0x96 /* xchg si,ax */\ |
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| 95 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 96 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 97 | 0xf3 0xa5 /* rep movsw */\ |
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| 98 | 0x11 0xc9 /* adc cx,cx */\ |
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| 99 | 0xf3 0xa4 /* rep movsb */\ |
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| 100 | 0x1f /* pop ds */\ |
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| 101 | parm [es di] [si ax] [cx] \ |
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| 102 | modify exact [di si cx ax]; |
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| 103 | #else |
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| 104 | extern void movebwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 105 | #pragma aux movebwd = \ |
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| 106 | 0xfd /* std */\ |
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| 107 | 0x1e /* push ds */\ |
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| 108 | 0x96 /* xchg si,ax */\ |
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| 109 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 110 | 0x4e /* dec si */\ |
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| 111 | 0x4f /* dec di */\ |
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| 112 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 113 | 0xf3 0xa5 /* rep movsw */\ |
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| 114 | 0x11 0xc9 /* adc cx,cx */\ |
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| 115 | 0x46 /* inc si */\ |
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| 116 | 0x47 /* inc di */\ |
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| 117 | 0xf3 0xa4 /* rep movsb */\ |
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| 118 | 0xfc /* cld */\ |
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| 119 | 0x1f /* pop ds */\ |
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| 120 | parm [es di] [si ax] [cx] \ |
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| 121 | modify exact [di si cx ax]; |
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| 122 | |||
| 123 | extern void movefwd( char _WCFAR *dst, const char _WCFAR *src, unsigned len); |
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| 124 | #pragma aux movefwd = \ |
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| 125 | 0x1e /* push ds */\ |
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| 126 | 0x96 /* xchg si,ax */\ |
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| 127 | 0x8e 0xd8 /* mov ds,ax */\ |
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| 128 | 0xd1 0xe9 /* shr cx,1 */\ |
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| 129 | 0xf3 0xa5 /* rep movsw */\ |
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| 130 | 0x11 0xc9 /* adc cx,cx */\ |
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| 131 | 0xf3 0xa4 /* rep movsb */\ |
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| 132 | 0x1f /* pop ds */\ |
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| 133 | parm [es di] [si ax] [cx] \ |
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| 134 | modify exact [di si cx ax]; |
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| 135 | #endif |
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| 136 | #else |
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| 137 | #error platform not supported |
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| 138 | #endif |
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| 139 | |||
| 140 | |||
| 141 | _WCRTLINK void _WCFAR *_fmemmove( void _WCFAR *t, const void _WCFAR *f, size_t len ) |
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| 142 | { |
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| 143 | char _WCFAR *to = t; |
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| 144 | const char _WCFAR *from = f; |
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| 145 | if( from == to ) { |
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| 146 | return( to ); |
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| 147 | } |
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| 148 | if( from < to && from + len > to ) { /* if buffers are overlapped*/ |
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| 149 | #if defined(__HUGE__) || defined(__386__) |
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| 150 | to += len; |
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| 151 | from += len; |
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| 152 | while( len != 0 ) { |
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| 153 | to--; |
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| 154 | from--; |
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| 155 | *to = *from; |
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| 156 | len--; |
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| 157 | } |
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| 158 | #else |
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| 159 | movebwd(( to + len ) - 1, ( from + len ) - 1, len ); |
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| 160 | #endif |
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| 161 | } else { |
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| 162 | movefwd( to, from, len ); |
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| 163 | } |
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| 164 | return( to ); |
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| 165 | } |
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| 166 |