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| 1 | /* memcopy.h -- definitions for memory copy functions. i386 version. |
|---|---|
| 2 | Copyright (C) 1991-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <sysdeps/generic/memcopy.h> |
| 20 | |
| 21 | #undef BYTE_COPY_FWD |
| 22 | #define BYTE_COPY_FWD(dst_bp, src_bp, nbytes) \ |
| 23 | do { \ |
| 24 | int __d0; \ |
| 25 | asm volatile(/* Clear the direction flag, so copying goes forward. */ \ |
| 26 | "cld\n" \ |
| 27 | /* Copy bytes. */ \ |
| 28 | "rep\n" \ |
| 29 | "movsb" : \ |
| 30 | "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ |
| 31 | "0" (dst_bp), "1" (src_bp), "2" (nbytes) : \ |
| 32 | "memory"); \ |
| 33 | } while (0) |
| 34 | |
| 35 | #undef BYTE_COPY_BWD |
| 36 | #define BYTE_COPY_BWD(dst_ep, src_ep, nbytes) \ |
| 37 | do \ |
| 38 | { \ |
| 39 | int __d0; \ |
| 40 | asm volatile(/* Set the direction flag, so copying goes backwards. */ \ |
| 41 | "std\n" \ |
| 42 | /* Copy bytes. */ \ |
| 43 | "rep\n" \ |
| 44 | "movsb\n" \ |
| 45 | /* Clear the dir flag. Convention says it should be 0. */ \ |
| 46 | "cld" : \ |
| 47 | "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ |
| 48 | "0" (dst_ep - 1), "1" (src_ep - 1), "2" (nbytes) : \ |
| 49 | "memory"); \ |
| 50 | dst_ep += 1; \ |
| 51 | src_ep += 1; \ |
| 52 | } while (0) |
| 53 | |
| 54 | #undef WORD_COPY_FWD |
| 55 | #define WORD_COPY_FWD(dst_bp, src_bp, nbytes_left, nbytes) \ |
| 56 | do \ |
| 57 | { \ |
| 58 | int __d0; \ |
| 59 | asm volatile(/* Clear the direction flag, so copying goes forward. */ \ |
| 60 | "cld\n" \ |
| 61 | /* Copy longwords. */ \ |
| 62 | "rep\n" \ |
| 63 | "movsl" : \ |
| 64 | "=D" (dst_bp), "=S" (src_bp), "=c" (__d0) : \ |
| 65 | "0" (dst_bp), "1" (src_bp), "2" ((nbytes) / 4) : \ |
| 66 | "memory"); \ |
| 67 | (nbytes_left) = (nbytes) % 4; \ |
| 68 | } while (0) |
| 69 | |
| 70 | #undef WORD_COPY_BWD |
| 71 | #define WORD_COPY_BWD(dst_ep, src_ep, nbytes_left, nbytes) \ |
| 72 | do \ |
| 73 | { \ |
| 74 | int __d0; \ |
| 75 | asm volatile(/* Set the direction flag, so copying goes backwards. */ \ |
| 76 | "std\n" \ |
| 77 | /* Copy longwords. */ \ |
| 78 | "rep\n" \ |
| 79 | "movsl\n" \ |
| 80 | /* Clear the dir flag. Convention says it should be 0. */ \ |
| 81 | "cld" : \ |
| 82 | "=D" (dst_ep), "=S" (src_ep), "=c" (__d0) : \ |
| 83 | "0" (dst_ep - 4), "1" (src_ep - 4), "2" ((nbytes) / 4) : \ |
| 84 | "memory"); \ |
| 85 | dst_ep += 4; \ |
| 86 | src_ep += 4; \ |
| 87 | (nbytes_left) = (nbytes) % 4; \ |
| 88 | } while (0) |
| 89 |
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