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/* Copyright (C) 2006 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.
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 <features.h>
#ifdef __UCLIBC_HAS_THREADS_NATIVE__
#include <sysdep.h>
#if defined __thumb__
/* Out-of-line atomic operations that we can't do in Thumb mode.
This ends up in various libraries where it is needed (and
a few .a archives where it isn't). */
.hidden __thumb_swpb
ENTRY (__thumb_swpb)
swpb r0, r0, [r1]
bx lr
END (__thumb_swpb)
.hidden __thumb_swp
ENTRY (__thumb_swp)
swp r0, r0, [r1]
bx lr
END (__thumb_swp)
.hidden __thumb_cmpxchg
ENTRY (__thumb_cmpxchg)
stmdb sp!, {r4, lr}
mov r4, r0
0: ldr r3, [r2]
cmp r3, r4
bne 1f
mov r0, r4
mov r3, #0xffff0fff
mov lr, pc
add pc, r3, #(0xffff0fc0 - 0xffff0fff)
bcc 0b
mov r3, r4
1: mov r0, r3
ldmia sp!, {r4, pc}
END (__thumb_cmpxchg)
#endif /* __thumb__ */
#endif /* __UCLIBC_HAS_THREADS_NATIVE__ */
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