mirror of
https://sourceware.org/git/glibc.git
synced 2025-08-08 17:42:12 +03:00
2c421fc430
Now we finally support modern GCC and binutils, it's time for a cleanup. Use PAC and BTI instructions unconditionally and use proper assembler syntax. Remove the PR target/94791 strip_pac workarounds for buggy GCCs. Remove the PAC/BTI configure checks - always emit GNU property notes on assembly files. Change cfi_window_save to the correct cfi_negate_ra_state unwind directive. Reviewed-by: Matthieu Longo <matthieu.longo@arm.com>
43 lines
1.9 KiB
C
43 lines
1.9 KiB
C
/* Define INIT_ARCH so that midr is initialized before use by IFUNCs.
|
|
This file is part of the GNU C Library.
|
|
Copyright (C) 2017-2025 Free Software Foundation, Inc.
|
|
|
|
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 <ldsodefs.h>
|
|
#include <sys/auxv.h>
|
|
|
|
/* Make glibc MTE-safe on a system that supports MTE in case user code
|
|
enables tag checks independently of the mte_status of glibc. There
|
|
is currently no ABI contract for enabling tag checks in user code,
|
|
but this can be useful for debugging with MTE. */
|
|
#define MTE_ENABLED() (GLRO(dl_hwcap2) & HWCAP2_MTE)
|
|
|
|
#define INIT_ARCH() \
|
|
uint64_t __attribute__((unused)) midr = \
|
|
GLRO(dl_aarch64_cpu_features).midr_el1; \
|
|
unsigned __attribute__((unused)) zva_size = \
|
|
GLRO(dl_aarch64_cpu_features).zva_size; \
|
|
bool __attribute__((unused)) bti = \
|
|
GLRO(dl_aarch64_cpu_features).bti; \
|
|
bool __attribute__((unused)) mte = \
|
|
MTE_ENABLED (); \
|
|
bool __attribute__((unused)) sve = \
|
|
GLRO(dl_aarch64_cpu_features).sve; \
|
|
bool __attribute__((unused)) prefer_sve_ifuncs = \
|
|
GLRO(dl_aarch64_cpu_features).prefer_sve_ifuncs; \
|
|
bool __attribute__((unused)) mops = \
|
|
GLRO(dl_aarch64_cpu_features).mops;
|