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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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