glibc/sysdeps/x86_64/tls_get_addr.S

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/* Stack-aligning implementation of __tls_get_addr. x86-64 version.
Copyright (C) 2017-2022 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
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
<https://www.gnu.org/licenses/>. */
#ifdef SHARED
# include <sysdep.h>
# include "tlsdesc.h"
# include "rtld-offsets.h"
/* See __tls_get_addr and __tls_get_addr_slow in dl-tls.c. This function
call __tls_get_addr_slow on both slow paths. It realigns the stack
before the call to work around GCC PR58066. */
ENTRY (__tls_get_addr)
mov %fs:DTV_OFFSET, %RDX_LP
mov GL_TLS_GENERATION_OFFSET+_rtld_local(%rip), %RAX_LP
/* GL(dl_tls_generation) == dtv[0].counter */
cmp %RAX_LP, (%rdx)
jne 1f
mov TI_MODULE_OFFSET(%rdi), %RAX_LP
/* dtv[ti->ti_module] */
# ifdef __LP64__
salq $4, %rax
movq (%rdx,%rax), %rax
# else
movl (%rdx,%rax, 8), %eax
# endif
cmp $-1, %RAX_LP
je 1f
add TI_OFFSET_OFFSET(%rdi), %RAX_LP
ret
1:
/* On the slow path, align the stack. */
pushq %rbp
cfi_def_cfa_offset (16)
cfi_offset (%rbp, -16)
mov %RSP_LP, %RBP_LP
cfi_def_cfa_register (%rbp)
and $-16, %RSP_LP
call __tls_get_addr_slow
mov %RBP_LP, %RSP_LP
popq %rbp
cfi_def_cfa (%rsp, 8)
ret
END (__tls_get_addr)
#endif /* SHARED */