Permalink
Cannot retrieve contributors at this time
Name already in use
A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?
glibc/sysdeps/unix/sysv/linux/m68k/m68k-helpers.S
Go to fileThis commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
95 lines (83 sloc)
3.17 KB
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Copyright (C) 2010-2015 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. | |
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. | |
In addition to the permissions in the GNU Lesser General Public | |
License, the Free Software Foundation gives you unlimited | |
permission to link the compiled version of this file with other | |
programs, and to distribute those programs without any restriction | |
coming from the use of this file. (The GNU Lesser General Public | |
License restrictions do apply in other respects; for example, they | |
cover modification of the file, and distribution when not linked | |
into another program.) | |
Note that people who make modified versions of this file are not | |
obligated to grant this special exception for their modified | |
versions; it is their choice whether to do so. The GNU Lesser | |
General Public License gives permission to release a modified | |
version without this exception; this exception also makes it | |
possible to release a modified version which carries forward this | |
exception. | |
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 | |
<http://www.gnu.org/licenses/>. */ | |
#include <sysdep.h> | |
#include <m68k-vdso.h> | |
.text | |
.hidden __vdso_read_tp_stub | |
ENTRY (__vdso_read_tp_stub) | |
move.l #__NR_get_thread_area, %d0 | |
trap #0 | |
move.l %d0, %a0 | |
rts | |
END (__vdso_read_tp_stub) | |
# ifdef SHARED | |
/* GCC will emit calls to this routine. Linux has an | |
equivalent helper function (which clobbers fewer registers than | |
a normal function call) in a vdso; tail call to the | |
helper. */ | |
# if IS_IN (rtld) | |
/* rtld gets a hidden copy of __m68k_read_tp. */ | |
.hidden __m68k_read_tp | |
# endif | |
ENTRY (__m68k_read_tp) | |
LOAD_GOT (%a0) | |
move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0 | |
move.l (%a0), %a0 | |
jmp (%a0) | |
END (__m68k_read_tp) | |
/* The following two stubs are for macros in atomic.h, they can't | |
clobber anything. */ | |
.hidden __vdso_atomic_cmpxchg_32_stub | |
ENTRY (__vdso_atomic_cmpxchg_32_stub) | |
move.l %d2, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
cfi_rel_offset (%d2, 0) | |
move.l %d0, %d2 | |
move.l #SYS_ify (atomic_cmpxchg_32), %d0 | |
trap #0 | |
move.l (%sp)+, %d2 | |
cfi_adjust_cfa_offset (-4) | |
cfi_restore (%d2) | |
rts | |
END (__vdso_atomic_cmpxchg_32_stub) | |
.hidden __vdso_atomic_barrier_stub | |
ENTRY (__vdso_atomic_barrier_stub) | |
move.l %d0, -(%sp) | |
cfi_adjust_cfa_offset (4) | |
move.l #SYS_ify (atomic_barrier), %d0 | |
trap #0 | |
move.l (%sp)+, %d0 | |
cfi_adjust_cfa_offset (-4) | |
rts | |
END (__vdso_atomic_barrier_stub) | |
# else /* !SHARED */ | |
/* If the vDSO is not available, use a syscall to get TP. */ | |
strong_alias (__vdso_read_tp_stub, __m68k_read_tp) | |
# endif /* SHARED */ |