| /* memcpy with REP MOVSB/STOSB |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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" |
| |
| #ifndef MEMCPY |
| # define MEMCPY memcpy |
| # define MEMCPY_CHK __memcpy_chk |
| #endif |
| |
| #ifdef USE_AS_BCOPY |
| # define STR2 12 |
| # define STR1 STR2+4 |
| # define N STR1+4 |
| #else |
| # define STR1 12 |
| # define STR2 STR1+4 |
| # define N STR2+4 |
| #endif |
| |
| #define CFI_PUSH(REG) \ |
| cfi_adjust_cfa_offset (4); \ |
| cfi_rel_offset (REG, 0) |
| |
| #define CFI_POP(REG) \ |
| cfi_adjust_cfa_offset (-4); \ |
| cfi_restore (REG) |
| |
| #define PUSH(REG) pushl REG; CFI_PUSH (REG) |
| #define POP(REG) popl REG; CFI_POP (REG) |
| |
| .text |
| #if defined SHARED && IS_IN (libc) && !defined USE_AS_BCOPY |
| ENTRY (MEMCPY_CHK) |
| movl 12(%esp), %eax |
| cmpl %eax, 16(%esp) |
| jb HIDDEN_JUMPTARGET (__chk_fail) |
| END (MEMCPY_CHK) |
| #endif |
| ENTRY (MEMCPY) |
| PUSH (%esi) |
| PUSH (%edi) |
| movl N(%esp), %ecx |
| movl STR1(%esp), %edi |
| movl STR2(%esp), %esi |
| mov %edi, %eax |
| #ifdef USE_AS_MEMPCPY |
| add %ecx, %eax |
| #endif |
| |
| #ifdef USE_AS_MEMMOVE |
| cmp %esi, %edi |
| ja L(copy_backward) |
| je L(bwd_write_0bytes) |
| #endif |
| |
| rep movsb |
| POP (%edi) |
| POP (%esi) |
| ret |
| |
| #ifdef USE_AS_MEMMOVE |
| L(copy_backward): |
| lea -1(%edi,%ecx), %edi |
| lea -1(%esi,%ecx), %esi |
| std |
| rep movsb |
| cld |
| L(bwd_write_0bytes): |
| POP (%edi) |
| POP (%esi) |
| ret |
| #endif |
| |
| END (MEMCPY) |
| |
| #ifndef USE_AS_BCOPY |
| libc_hidden_builtin_def (MEMCPY) |
| #endif |
