2018-01-29 18:28:32 +00:00
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/* RISC-V instruction cache flushing VDSO calls
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2021-01-02 19:32:25 +00:00
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Copyright (C) 2017-2021 Free Software Foundation, Inc.
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2018-01-29 18:28:32 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2018-01-29 18:28:32 +00:00
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#include <dl-vdso.h>
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#include <stdlib.h>
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#include <atomic.h>
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#include <sys/cachectl.h>
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2019-06-06 09:24:32 +00:00
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#if __has_include (<asm/syscalls.h>)
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2018-12-31 17:26:42 +00:00
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# include <asm/syscalls.h>
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#else
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# include <asm/unistd.h>
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#endif
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2020-01-02 09:18:22 +00:00
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#include <sys/syscall.h>
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2018-01-29 18:28:32 +00:00
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typedef int (*func_type) (void *, void *, unsigned long int);
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static int
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__riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags)
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{
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return INLINE_SYSCALL (riscv_flush_icache, 3, start, end, flags);
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}
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static func_type
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__lookup_riscv_flush_icache (void)
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{
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elf: Move vDSO setup to rtld (BZ#24967)
This patch moves the vDSO setup from libc to loader code, just after
the vDSO link_map setup. For static case the initialization
is moved to _dl_non_dynamic_init instead.
Instead of using the mangled pointer, the vDSO data is set as
attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for
static). It is read-only even with partial relro.
It fixes BZ#24967 now that the vDSO pointer is setup earlier than
malloc interposition is called.
Also, vDSO calls should not be a problem for static dlopen as
indicated by BZ#20802. The vDSO pointer would be zero-initialized
and the syscall will be issued instead.
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu,
powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and
sparcv9-linux-gnu. I also run some tests on mips.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2019-11-29 13:44:59 +00:00
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func_type func = dl_vdso_vsym ("__vdso_flush_icache");
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2018-01-29 18:28:32 +00:00
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/* If there is no vDSO entry then call the system call directly. All Linux
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versions provide the vDSO entry, but QEMU's user-mode emulation doesn't
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provide a vDSO. */
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if (!func)
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func = &__riscv_flush_icache_syscall;
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return func;
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}
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#ifdef SHARED
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# define INIT_ARCH()
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libc_ifunc (__riscv_flush_icache, __lookup_riscv_flush_icache ())
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#else
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int
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__riscv_flush_icache (void *start, void *end, unsigned long int flags)
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{
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static volatile func_type cached_func;
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func_type func = atomic_load_relaxed (&cached_func);
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if (!func)
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{
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func = __lookup_riscv_flush_icache ();
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atomic_store_relaxed (&cached_func, func);
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}
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return func (start, end, flags);
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}
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#endif
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