1 files changed, 79 insertions, 0 deletions
diff --git a/ldso/ldso/arm/thumb_atomics.S b/ldso/ldso/arm/thumb_atomics.S
new file mode 100644
index 000000000..f6ae3db3c
--- /dev/null
+++ b/ldso/ldso/arm/thumb_atomics.S
@@ -0,0 +1,79 @@
+/* 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#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__ */
+