/* Copyright (C) 2020-2021 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 . */ #include #ifdef USE_MTAG /* 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(__libc_mtag_memset_with_tag) 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) #if 0 /* This is not currently needed, since for now we are only called to tag memory that is taggable. */ ldg dstin, [dstin] // Recover the tag created (might be untagged). #endif ret END (__libc_mtag_memset_with_tag) #endif /* USE_MTAG */