projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| eea9507a LFT |
1 | /* |
| 2 | * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> | |
| 3 | * Copyright (C) 2004 Microtronix Datacom Ltd | |
| 4 | * | |
| 5 | * This file is subject to the terms and conditions of the GNU General Public | |
| 6 | * License. See the file "COPYING" in the main directory of this archive | |
| 7 | * for more details. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/types.h> | |
| 11 | #include <linux/string.h> | |
| 12 | ||
| 13 | #ifdef __HAVE_ARCH_MEMMOVE | |
| 14 | void *memmove(void *d, const void *s, size_t count) | |
| 15 | { | |
| 16 | unsigned long dst, src; | |
| 17 | ||
| 18 | if (!count) | |
| 19 | return d; | |
| 20 | ||
| 21 | if (d < s) { | |
| 22 | dst = (unsigned long) d; | |
| 23 | src = (unsigned long) s; | |
| 24 | ||
| 25 | if ((count < 8) || ((dst ^ src) & 3)) | |
| 26 | goto restup; | |
| 27 | ||
| 28 | if (dst & 1) { | |
| 29 | *(char *)dst++ = *(char *)src++; | |
| 30 | count--; | |
| 31 | } | |
| 32 | if (dst & 2) { | |
| 33 | *(short *)dst = *(short *)src; | |
| 34 | src += 2; | |
| 35 | dst += 2; | |
| 36 | count -= 2; | |
| 37 | } | |
| 38 | while (count > 3) { | |
| 39 | *(long *)dst = *(long *)src; | |
| 40 | src += 4; | |
| 41 | dst += 4; | |
| 42 | count -= 4; | |
| 43 | } | |
| 44 | restup: | |
| 45 | while (count--) | |
| 46 | *(char *)dst++ = *(char *)src++; | |
| 47 | } else { | |
| 48 | dst = (unsigned long) d + count; | |
| 49 | src = (unsigned long) s + count; | |
| 50 | ||
| 51 | if ((count < 8) || ((dst ^ src) & 3)) | |
| 52 | goto restdown; | |
| 53 | ||
| 54 | if (dst & 1) { | |
| 55 | src--; | |
| 56 | dst--; | |
| 57 | count--; | |
| 58 | *(char *)dst = *(char *)src; | |
| 59 | } | |
| 60 | if (dst & 2) { | |
| 61 | src -= 2; | |
| 62 | dst -= 2; | |
| 63 | count -= 2; | |
| 64 | *(short *)dst = *(short *)src; | |
| 65 | } | |
| 66 | while (count > 3) { | |
| 67 | src -= 4; | |
| 68 | dst -= 4; | |
| 69 | count -= 4; | |
| 70 | *(long *)dst = *(long *)src; | |
| 71 | } | |
| 72 | restdown: | |
| 73 | while (count--) { | |
| 74 | src--; | |
| 75 | dst--; | |
| 76 | *(char *)dst = *(char *)src; | |
| 77 | } | |
| 78 | } | |
| 79 | ||
| 80 | return d; | |
| 81 | } | |
| 82 | #endif /* __HAVE_ARCH_MEMMOVE */ |