| /* Copy memory block and return pointer to beginning of destination block |
| For Intel 80x86, x>=6. |
| This file is part of the GNU C Library. |
| Copyright (C) 2003-2014 Free Software Foundation, Inc. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 2003. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include "asm-syntax.h" |
| |
| #define PARMS 4+4 /* one spilled register */ |
| #define RTN PARMS |
| |
| .text |
| |
| #ifdef USE_AS_BCOPY |
| # define SRC RTN |
| # define DEST SRC+4 |
| # define LEN DEST+4 |
| #else |
| # define DEST RTN |
| # define SRC DEST+4 |
| # define LEN SRC+4 |
| |
| # if defined PIC && !defined NOT_IN_libc |
| ENTRY_CHK (__memmove_chk) |
| movl 12(%esp), %eax |
| cmpl %eax, 16(%esp) |
| jb HIDDEN_JUMPTARGET (__chk_fail) |
| END_CHK (__memmove_chk) |
| # endif |
| #endif |
| |
| ENTRY (memmove) |
| |
| pushl %edi |
| cfi_adjust_cfa_offset (4) |
| |
| movl LEN(%esp), %ecx |
| movl DEST(%esp), %edi |
| cfi_rel_offset (edi, 0) |
| movl %esi, %edx |
| movl SRC(%esp), %esi |
| cfi_register (esi, edx) |
| |
| movl %edi, %eax |
| subl %esi, %eax |
| cmpl %eax, %ecx |
| ja 3f |
| |
| cld |
| shrl $1, %ecx |
| jnc 1f |
| movsb |
| 1: shrl $1, %ecx |
| jnc 2f |
| movsw |
| 2: rep |
| movsl |
| movl %edx, %esi |
| cfi_restore (esi) |
| #ifndef USE_AS_BCOPY |
| movl DEST(%esp), %eax |
| #endif |
| |
| popl %edi |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (edi) |
| |
| ret |
| |
| cfi_adjust_cfa_offset (4) |
| cfi_rel_offset (edi, 0) |
| cfi_register (esi, edx) |
| |
| /* Backward copying. */ |
| 3: std |
| leal -1(%edi, %ecx), %edi |
| leal -1(%esi, %ecx), %esi |
| shrl $1, %ecx |
| jnc 1f |
| movsb |
| 1: subl $1, %edi |
| subl $1, %esi |
| shrl $1, %ecx |
| jnc 2f |
| movsw |
| 2: subl $2, %edi |
| subl $2, %esi |
| rep |
| movsl |
| movl %edx, %esi |
| cfi_restore (esi) |
| #ifndef USE_AS_BCOPY |
| movl DEST(%esp), %eax |
| #endif |
| |
| cld |
| popl %edi |
| cfi_adjust_cfa_offset (-4) |
| cfi_restore (edi) |
| |
| ret |
| END (memmove) |
| #ifndef USE_AS_BCOPY |
| libc_hidden_builtin_def (memmove) |
| #endif |
