| /* memcpy - copy a block from source to destination. 64 bit S/390 version. |
| Copyright (C) 2012-2018 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" |
| |
| /* INPUT PARAMETERS |
| %r2 = address of destination memory area |
| %r3 = address of source memory area |
| %r4 = number of bytes to copy. */ |
| |
| |
| .text |
| ENTRY(__mempcpy) |
| .machine "z900" |
| lgr %r1,%r2 # Use as dest |
| la %r2,0(%r4,%r2) # Return dest + n |
| j .L_Z900_start |
| END(__mempcpy) |
| #ifndef USE_MULTIARCH |
| libc_hidden_def (__mempcpy) |
| weak_alias (__mempcpy, mempcpy) |
| libc_hidden_builtin_def (mempcpy) |
| #endif |
| |
| ENTRY(memcpy) |
| .machine "z900" |
| lgr %r1,%r2 # r1: Use as dest ; r2: Return dest |
| .L_Z900_start: |
| ltgr %r4,%r4 |
| je .L_Z900_4 |
| aghi %r4,-1 |
| srlg %r5,%r4,8 |
| ltgr %r5,%r5 |
| jne .L_Z900_13 |
| .L_Z900_3: |
| larl %r5,.L_Z900_15 |
| ex %r4,0(%r5) |
| .L_Z900_4: |
| br %r14 |
| .L_Z900_13: |
| cghi %r5,4096 # Switch to mvcle for copies >1MB |
| jh __memcpy_mvcle |
| .L_Z900_12: |
| mvc 0(256,%r1),0(%r3) |
| la %r1,256(%r1) |
| la %r3,256(%r3) |
| brctg %r5,.L_Z900_12 |
| j .L_Z900_3 |
| .L_Z900_15: |
| mvc 0(1,%r1),0(%r3) |
| END(memcpy) |
| #ifndef USE_MULTIARCH |
| 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. |
| lgr %r0,%r2 # backup return dest [ + n ] |
| aghi %r4,1 # length + 1 |
| lgr %r5,%r4 # source length |
| lgr %r4,%r3 # source address |
| lgr %r2,%r1 # destination address |
| lgr %r3,%r5 # destination length = source length |
| .L_MVCLE_1: |
| mvcle %r2,%r4,0 # thats it, MVCLE is your friend |
| jo .L_MVCLE_1 |
| lgr %r2,%r0 # return destination address |
| br %r14 |
| END(__memcpy_mvcle) |
