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| author | Carlos Eduardo Seo <carlos.seo@arm.com> | 2021-07-12 15:06:26 -0300 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-27 14:46:50 +0100 |
| commit | 61c8e4890382f52761cd2821f71e8021c744a39d (patch) | |
| tree | 014647b3c136abb1e2739a71a9bf42e64e52ca48 | |
| parent | 2721402968a36621ce027fa31c0f47a6c97f0fc8 (diff) | |
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aarch64: morello: purecap rawmemchr
Modified rawmemchr to support Arm Morello Capabilities.
| -rw-r--r-- | sysdeps/aarch64/morello/rawmemchr.S | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/sysdeps/aarch64/morello/rawmemchr.S b/sysdeps/aarch64/morello/rawmemchr.S new file mode 100644 index 0000000000..10e89ee6b7 --- /dev/null +++ b/sysdeps/aarch64/morello/rawmemchr.S @@ -0,0 +1,43 @@ +/* rawmemchr - find a character in a memory zone + + Copyright (C) 2022 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 + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> + +/* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr. + Call strlen without setting up a full frame - it preserves x14/x15. +*/ + +ENTRY (__rawmemchr) + + cbz w1, L(do_strlen) + mov x2, -1 + b __memchr + +L(do_strlen): + mov c15, c30 + cfi_return_column (c15) + mov c14, c0 + bl __strlen + add c0, c14, x0 + ret c15 + +END (__rawmemchr) +weak_alias (__rawmemchr, rawmemchr) +libc_hidden_builtin_def (__rawmemchr) |