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author | Richard Earnshaw <rearnsha@arm.com> | 2020-11-20 17:20:10 +0000 |
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committer | Richard Earnshaw <rearnsha@arm.com> | 2020-11-20 18:13:52 +0000 |
commit | 8a9f2a6e9b3e8f717b26394c7e2f66d7f3bba077 (patch) | |
tree | eb5a5a35853d5c9b1f7db18282ce37c7c8f076bd /sysdeps/aarch64/__mtag_memset_tag.S | |
parent | 05ab98edbda5a751ca3831058d196309b48e8d2b (diff) | |
download | glibc-8a9f2a6e9b3e8f717b26394c7e2f66d7f3bba077.tar.gz glibc-8a9f2a6e9b3e8f717b26394c7e2f66d7f3bba077.tar.xz glibc-8a9f2a6e9b3e8f717b26394c7e2f66d7f3bba077.zip |
aarch64: Add aarch64-specific files for memory tagging support rearnsha/mte-v3.0
This final patch provides the architecture-specific implementation of the memory-tagging support hooks for aarch64.
Diffstat (limited to 'sysdeps/aarch64/__mtag_memset_tag.S')
-rw-r--r-- | sysdeps/aarch64/__mtag_memset_tag.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/aarch64/__mtag_memset_tag.S b/sysdeps/aarch64/__mtag_memset_tag.S new file mode 100644 index 0000000000..bc98dc49d2 --- /dev/null +++ b/sysdeps/aarch64/__mtag_memset_tag.S @@ -0,0 +1,46 @@ +/* Copyright (C) 2020 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> +/* Use the same register names and assignments as memset. */ +#include "memset-reg.h" + + .arch armv8.5-a + .arch_extension memtag + +/* NB, only supported on variants with 64-bit pointers. */ + +/* FIXME: This is a minimal implementation. We could do much better than + this for large values of COUNT. */ + +ENTRY_ALIGN(__libc_mtag_memset_with_tag, 6) + + and valw, valw, 255 + orr valw, valw, valw, lsl 8 + orr valw, valw, valw, lsl 16 + orr val, val, val, lsl 32 + mov dst, dstin + +L(loop): + stgp val, val, [dst], #16 + subs count, count, 16 + bne L(loop) + ldg dstin, [dstin] // Recover the tag created (might be untagged). + ret +END (__libc_mtag_memset_with_tag) +libc_hidden_builtin_def (__libc_mtag_memset_with_tag) |