| /* memcpy - copy a block from source to destination. S/390 version. |
| Copyright (C) 2012-2014 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" |
| |
| /* INPUT PARAMETERS |
| %r2 = address of destination memory area |
| %r3 = address of source memory area |
| %r4 = number of bytes to copy. */ |
| |
| #ifdef USE_MULTIARCH |
| ENTRY(memcpy_g5) |
| #else |
| ENTRY(memcpy) |
| #endif |
| .machine "g5" |
| st %r13,52(%r15) |
| .cfi_offset 13, -44 |
| basr %r13,0 |
| .L_G5_16: |
| ltr %r4,%r4 |
| je .L_G5_4 |
| ahi %r4,-1 |
| lr %r5,%r4 |
| srl %r5,8 |
| ltr %r5,%r5 |
| lr %r1,%r2 |
| jne .L_G5_12 |
| ex %r4,.L_G5_17-.L_G5_16(%r13) |
| .L_G5_4: |
| l %r13,52(%r15) |
| br %r14 |
| .L_G5_13: |
| chi %r5,4096 # Switch to mvcle for copies >1MB |
| jh memcpy_mvcle |
| .L_G5_12: |
| mvc 0(256,%r1),0(%r3) |
| la %r1,256(%r1) |
| la %r3,256(%r3) |
| brct %r5,.L_G5_12 |
| ex %r4,.L_G5_17-.L_G5_16(%r13) |
| j .L_G5_4 |
| .L_G5_17: |
| mvc 0(1,%r1),0(%r3) |
| #ifdef USE_MULTIARCH |
| END(memcpy_g5) |
| #else |
| END(memcpy) |
| libc_hidden_builtin_def (memcpy) |
| #endif |
| |
| ENTRY(memcpy_mvcle) |
| # Using as standalone function will result in unexpected |
| # results since the length field is incremented by 1 in order to |
| # compensate the changes already done in the functions above. |
| ahi %r4,1 # length + 1 |
| lr %r5,%r4 # source length |
| lr %r4,%r3 # source address |
| lr %r3,%r5 # destination length = source length |
| .L_MVCLE_1: |
| mvcle %r2,%r4,0 # thats it, MVCLE is your friend |
| jo .L_MVCLE_1 |
| lr %r2,%r1 # return destination address |
| br %r14 |
| END(memcpy_mvcle) |
