projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6923133b UD |
1 | /* Copy memory block and return pointer to beginning of destination block |
| 2 | For Intel 80x86, x>=6. | |
| 3 | This file is part of the GNU C Library. | |
| 04277e02 | 4 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| 6923133b UD |
5 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| 6923133b UD |
11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| 6923133b | 16 | |
| 41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 18 | License along with the GNU C Library; if not, see |
| 5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
| 6923133b UD |
20 | |
| 21 | #include <sysdep.h> | |
| 22 | #include "asm-syntax.h" | |
| 23 | ||
| 2366713d | 24 | #define PARMS 4 /* no space for saved regs */ |
| 3f02f778 | 25 | #define RTN PARMS |
| 2366713d JM |
26 | #define DEST RTN |
| 27 | #define SRC DEST+4 | |
| 28 | #define LEN SRC+4 | |
| 6923133b | 29 | |
| 3f02f778 | 30 | .text |
| 4f41c682 | 31 | #if defined PIC && IS_IN (libc) |
| 3af48cbd | 32 | ENTRY_CHK (__memcpy_chk) |
| b5cc329c UD |
33 | movl 12(%esp), %eax |
| 34 | cmpl %eax, 16(%esp) | |
| 35 | jb HIDDEN_JUMPTARGET (__chk_fail) | |
| 3af48cbd | 36 | END_CHK (__memcpy_chk) |
| b5cc329c | 37 | #endif |
| 2366713d | 38 | ENTRY (memcpy) |
| 3f02f778 | 39 | |
| 6923133b | 40 | movl %edi, %eax |
| 3f02f778 | 41 | movl DEST(%esp), %edi |
| 6923133b | 42 | movl %esi, %edx |
| 3f02f778 | 43 | movl SRC(%esp), %esi |
| 2fc08826 | 44 | |
| 21208604 UD |
45 | movl %edi, %ecx |
| 46 | xorl %esi, %ecx | |
| 47 | andl $3, %ecx | |
| 48 | movl LEN(%esp), %ecx | |
| 6923133b | 49 | cld |
| 21208604 UD |
50 | jne .Lunaligned |
| 51 | ||
| 52 | cmpl $3, %ecx | |
| 53 | jbe .Lunaligned | |
| 54 | ||
| 55 | testl $3, %esi | |
| 56 | je 1f | |
| 6923133b | 57 | movsb |
| 21208604 UD |
58 | decl %ecx |
| 59 | testl $3, %esi | |
| 60 | je 1f | |
| 61 | movsb | |
| 62 | decl %ecx | |
| 63 | testl $3, %esi | |
| 64 | je 1f | |
| 65 | movsb | |
| 66 | decl %ecx | |
| 67 | 1: pushl %eax | |
| 68 | movl %ecx, %eax | |
| 69 | shrl $2, %ecx | |
| cf3a8c7f | 70 | andl $3, %eax |
| 21208604 | 71 | rep |
| 6923133b | 72 | movsl |
| 21208604 | 73 | movl %eax, %ecx |
| 21208604 UD |
74 | rep |
| 75 | movsb | |
| 76 | popl %eax | |
| 77 | ||
| 78 | .Lend: movl %eax, %edi | |
| 6923133b | 79 | movl %edx, %esi |
| 3f02f778 GM |
80 | movl DEST(%esp), %eax |
| 81 | ||
| 2366713d | 82 | ret |
| 21208604 UD |
83 | |
| 84 | /* When we come here the pointers do not have the same | |
| 85 | alignment or the length is too short. No need to optimize for | |
| 86 | aligned memory accesses. */ | |
| 87 | .Lunaligned: | |
| 88 | shrl $1, %ecx | |
| 89 | jnc 1f | |
| 90 | movsb | |
| 91 | 1: shrl $1, %ecx | |
| 92 | jnc 2f | |
| 93 | movsw | |
| 94 | 2: rep | |
| 95 | movsl | |
| 96 | jmp .Lend | |
| 2366713d | 97 | END (memcpy) |
| 85dd1003 | 98 | libc_hidden_builtin_def (memcpy) |