projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| c891b2df | 1 | /* memcpy - copy a block from source to destination. 64 bit S/390 version. |
| f7a9f785 | 2 | Copyright (C) 2012-2016 Free Software Foundation, Inc. |
| 41bdb6e2 | 3 | This file is part of the GNU C Library. |
| 847b055c AJ |
4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 847b055c AJ |
9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 13 | Lesser General Public License for more details. |
| 847b055c | 14 | |
| 41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 847b055c | 18 | |
| 08f43f9b | 19 | |
| 56e7d3ad | 20 | #include <sysdep.h> |
| 08f43f9b AK |
21 | #include "asm-syntax.h" |
| 22 | ||
| ffeac417 | 23 | /* INPUT PARAMETERS |
| c891b2df UD |
24 | %r2 = address of destination memory area |
| 25 | %r3 = address of source memory area | |
| ffeac417 | 26 | %r4 = number of bytes to copy. */ |
| 847b055c | 27 | |
| 847b055c | 28 | |
| 08f43f9b AK |
29 | .text |
| 30 | ||
| 31 | #ifdef USE_MULTIARCH | |
| 31556246 | 32 | ENTRY(__memcpy_default) |
| 08f43f9b | 33 | #else |
| ffeac417 | 34 | ENTRY(memcpy) |
| 08f43f9b AK |
35 | #endif |
| 36 | .machine "z900" | |
| 31556246 SL |
37 | ltgr %r4,%r4 |
| 38 | je .L_Z900_4 | |
| 39 | aghi %r4,-1 | |
| 40 | srlg %r5,%r4,8 | |
| 41 | ltgr %r5,%r5 | |
| 42 | lgr %r1,%r2 | |
| 43 | jne .L_Z900_13 | |
| 08f43f9b | 44 | .L_Z900_3: |
| 31556246 SL |
45 | larl %r5,.L_Z900_15 |
| 46 | ex %r4,0(%r5) | |
| 08f43f9b | 47 | .L_Z900_4: |
| 31556246 | 48 | br %r14 |
| 08f43f9b | 49 | .L_Z900_13: |
| 31556246 SL |
50 | chi %r5,4096 # Switch to mvcle for copies >1MB |
| 51 | jh __memcpy_mvcle | |
| 08f43f9b | 52 | .L_Z900_12: |
| 31556246 SL |
53 | mvc 0(256,%r1),0(%r3) |
| 54 | la %r1,256(%r1) | |
| 55 | la %r3,256(%r3) | |
| 56 | brctg %r5,.L_Z900_12 | |
| 57 | j .L_Z900_3 | |
| 08f43f9b | 58 | .L_Z900_15: |
| 31556246 | 59 | mvc 0(1,%r1),0(%r3) |
| 08f43f9b AK |
60 | |
| 61 | #ifdef USE_MULTIARCH | |
| 31556246 | 62 | END(__memcpy_default) |
| 08f43f9b | 63 | #else |
| c891b2df | 64 | END(memcpy) |
| 85dd1003 | 65 | libc_hidden_builtin_def (memcpy) |
| 08f43f9b AK |
66 | #endif |
| 67 | ||
| 1d532483 | 68 | ENTRY(__memcpy_mvcle) |
| 08f43f9b AK |
69 | # Using as standalone function will result in unexpected |
| 70 | # results since the length field is incremented by 1 in order to | |
| 71 | # compensate the changes already done in the functions above. | |
| 72 | aghi %r4,1 # length + 1 | |
| 73 | lgr %r5,%r4 # source length | |
| 74 | lgr %r4,%r3 # source address | |
| 75 | lgr %r3,%r5 # destination length = source length | |
| 76 | .L_MVCLE_1: | |
| 77 | mvcle %r2,%r4,0 # thats it, MVCLE is your friend | |
| 78 | jo .L_MVCLE_1 | |
| 79 | lgr %r2,%r1 # return destination address | |
| 80 | br %r14 | |
| 1d532483 | 81 | END(__memcpy_mvcle) |