From 40dc773f92ad33b6c742bbb84884761e399b9ce8 Mon Sep 17 00:00:00 2001 From: Szabolcs Nagy Date: Thu, 4 Feb 2021 10:04:07 +0000 Subject: aarch64: inline __libc_mtag_address_get_tag This is a common operation when heap tagging is enabled, so inline the instruction instead of using an extern call. The .inst directive is used instead of the name of the instruction (or acle intrinsics) because malloc.c is not compiled for armv8.5-a+memtag architecture, runtime cpu support detection is used. Prototypes are removed from the comments as they were not always correct. --- sysdeps/aarch64/Makefile | 3 +-- sysdeps/aarch64/__mtag_address_get_tag.S | 32 -------------------------------- sysdeps/aarch64/libc-mtag.h | 14 +++++++++----- 3 files changed, 10 insertions(+), 39 deletions(-) delete mode 100644 sysdeps/aarch64/__mtag_address_get_tag.S (limited to 'sysdeps') diff --git a/sysdeps/aarch64/Makefile b/sysdeps/aarch64/Makefile index 259070c..5d594de 100644 --- a/sysdeps/aarch64/Makefile +++ b/sysdeps/aarch64/Makefile @@ -40,8 +40,7 @@ endif ifeq ($(subdir),misc) sysdep_headers += sys/ifunc.h -sysdep_routines += __mtag_address_get_tag \ - __mtag_tag_zero_region \ +sysdep_routines += __mtag_tag_zero_region \ __mtag_new_tag \ __mtag_tag_region diff --git a/sysdeps/aarch64/__mtag_address_get_tag.S b/sysdeps/aarch64/__mtag_address_get_tag.S deleted file mode 100644 index eab6c49..0000000 --- a/sysdeps/aarch64/__mtag_address_get_tag.S +++ /dev/null @@ -1,32 +0,0 @@ -/* 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 -#define ptr x0 - - .arch armv8.5-a - .arch_extension memtag - -ENTRY (__libc_mtag_address_get_tag) - - ldg ptr, [ptr] - ret -END (__libc_mtag_address_get_tag) -#endif /* USE_MTAG */ diff --git a/sysdeps/aarch64/libc-mtag.h b/sysdeps/aarch64/libc-mtag.h index f58402c..da1b6be 100644 --- a/sysdeps/aarch64/libc-mtag.h +++ b/sysdeps/aarch64/libc-mtag.h @@ -35,17 +35,21 @@ #define __MTAG_MMAP_FLAGS PROT_MTE /* Set the tags for a region of memory, which must have size and alignment - that are multiples of __MTAG_GRANULE_SIZE. Size cannot be zero. - void *__libc_mtag_tag_region (const void *, size_t) */ + that are multiples of __MTAG_GRANULE_SIZE. Size cannot be zero. */ void *__libc_mtag_tag_region (void *, size_t); /* Optimized equivalent to __libc_mtag_tag_region followed by memset to 0. */ void *__libc_mtag_tag_zero_region (void *, size_t); /* Convert address P to a pointer that is tagged correctly for that - location. - void *__libc_mtag_address_get_tag (void*) */ -void *__libc_mtag_address_get_tag (void *); + location. */ +static __always_inline void * +__libc_mtag_address_get_tag (void *p) +{ + register void *x0 asm ("x0") = p; + asm (".inst 0xd9600000 /* ldg x0, [x0] */" : "+r" (x0)); + return x0; +} /* Assign a new (random) tag to a pointer P (does not adjust the tag on the memory addressed). -- cgit v1.1