glibc/sysdeps/x86_64/tls_get_addr.S
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

62 lines
1.8 KiB
ArmAsm

/* Stack-aligning implementation of __tls_get_addr. x86-64 version.
Copyright (C) 2017-2021 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
<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 */