projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| ffeac417 UD |
1 | /* strncpy - copy at most n characters from a string from source to |
| 2 | destination. 64 bit S/390 version | |
| 04277e02 | 3 | Copyright (C) 2001-2019 Free Software Foundation, Inc. |
| ffeac417 UD |
4 | Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com). |
| 5 | This file is part of the GNU C Library. | |
| 6 | ||
| 7 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
8 | modify it under the terms of the GNU Lesser General Public |
| 9 | License as published by the Free Software Foundation; either | |
| 10 | version 2.1 of the License, or (at your option) any later version. | |
| ffeac417 UD |
11 | |
| 12 | The GNU C Library is distributed in the hope that it will be useful, | |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 15 | Lesser General Public License for more details. |
| ffeac417 | 16 | |
| 41bdb6e2 | 17 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 18 | License along with the GNU C Library; if not, see |
| 5a82c748 | 19 | <https://www.gnu.org/licenses/>. */ |
| ffeac417 UD |
20 | |
| 21 | /* INPUT PARAMETERS | |
| 22 | %r2 = address of destination (dst) | |
| 23 | %r3 = address of source (src) | |
| 24 | %r4 = max of bytes to copy. */ | |
| 25 | ||
| d1bdbf38 | 26 | #include <ifunc-strncpy.h> |
| ffeac417 UD |
27 | #include "sysdep.h" |
| 28 | #include "asm-syntax.h" | |
| 29 | ||
| d1bdbf38 SL |
30 | #if HAVE_STRNCPY_Z900_G5 |
| 31 | ENTRY(STRNCPY_Z900_G5) | |
| ffeac417 UD |
32 | .text |
| 33 | stg %r2,48(%r15) # save dst pointer | |
| 34 | slgr %r2,%r3 # %r3 points to src, %r2+%r3 to dst | |
| 35 | lghi %r1,7 | |
| 36 | ngr %r1,%r4 # last 3 bits of # bytes | |
| 37 | srlg %r4,%r4,3 | |
| 38 | ltgr %r4,%r4 # less than 8 bytes to copy ? | |
| 39 | jz .L1 | |
| 40 | bras %r5,.L0 # enter loop & load address of a 0 | |
| 41 | .long 0 | |
| 42 | .L0: icmh %r0,8,0(%r3) # first byte | |
| 43 | jz .L3 | |
| 44 | icmh %r0,4,1(%r3) # second byte | |
| 45 | jz .L4 | |
| 46 | icmh %r0,2,2(%r3) # third byte | |
| 47 | jz .L5 | |
| 48 | icmh %r0,1,3(%r3) # fourth byte | |
| 49 | jz .L6 | |
| 50 | icm %r0,8,4(%r3) # fifth byte | |
| 51 | jz .L7 | |
| 52 | icm %r0,4,5(%r3) # sixth byte | |
| 53 | jz .L8 | |
| 54 | icm %r0,2,6(%r3) # seventh byte | |
| 55 | jz .L9 | |
| 56 | icm %r0,1,7(%r3) # eigth byte | |
| 57 | jz .L10 | |
| 58 | stg %r0,0(%r2,%r3) # store all eight to dest. | |
| 59 | la %r3,8(%r3) | |
| 60 | brct %r4,.L0 | |
| 61 | .L1: ltgr %r1,%r1 | |
| 62 | jz .Lexit | |
| 63 | .L2: icm %r0,1,0(%r3) | |
| 64 | stc %r0,0(%r2,%r3) | |
| 65 | la %r3,1(%r3) | |
| 66 | jz .L11 | |
| 67 | brct %r1,.L2 | |
| 68 | j .Lexit | |
| 69 | .L3: icmh %r0,4,0(%r5) | |
| 70 | .L4: icmh %r0,2,0(%r5) | |
| 71 | .L5: icmh %r0,1,0(%r5) | |
| 72 | .L6: icm %r0,8,0(%r5) | |
| 73 | .L7: icm %r0,4,0(%r5) | |
| 74 | .L8: icm %r0,2,0(%r5) | |
| 75 | .L9: icm %r0,1,0(%r5) | |
| 76 | .L10: stg %r0,0(%r2,%r3) | |
| 77 | la %r3,8(%r3) | |
| 78 | aghi %r4,-1 | |
| 79 | j .L12 | |
| 80 | .L11: aghi %r1,-1 | |
| 81 | .L12: sllg %r4,%r4,3 | |
| 82 | algr %r4,%r1 | |
| 83 | algr %r2,%r3 # start of dst area to be zeroed | |
| 84 | lgr %r3,%r4 | |
| 85 | slgr %r4,%r4 | |
| 86 | slgr %r5,%r5 | |
| 87 | .L13: mvcle %r2,%r4,0 # pad dst with zeroes | |
| 88 | jo .L13 | |
| 89 | .Lexit: lg %r2,48(%r15) # return dst pointer | |
| 90 | br %r14 | |
| d1bdbf38 SL |
91 | END(STRNCPY_Z900_G5) |
| 92 | ||
| 93 | # if ! HAVE_STRNCPY_IFUNC | |
| 94 | strong_alias (STRNCPY_Z900_G5, strncpy) | |
| 95 | # endif | |
| 96 | ||
| 97 | # if defined SHARED && IS_IN (libc) | |
| 98 | strong_alias (STRNCPY_Z900_G5, __GI_strncpy) | |
| 99 | # endif | |
| 100 | #endif |