1 files changed, 89 insertions, 0 deletions
diff --git a/ports/sysdeps/unix/sysv/linux/tile/swapcontext.S b/ports/sysdeps/unix/sysv/linux/tile/swapcontext.S
new file mode 100644
index 0000000000..e2b3d70709
--- /dev/null
+++ b/ports/sysdeps/unix/sysv/linux/tile/swapcontext.S
@@ -0,0 +1,89 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp) */
+
+	.text
+ENTRY (__swapcontext)
+	FEEDBACK_ENTER(__swapcontext)
+	/* Set up a frame and save r0 and r1.  */
+	{
+	 ST sp, lr
+	 ADDI_PTR r11, sp, -(3 * REGSIZE)
+	 move r10, sp
+	}
+	ADDI_PTR sp, sp, -(4 * REGSIZE)
+	cfi_def_cfa_offset (4 * REGSIZE)
+	cfi_offset (lr, 0)
+	{
+	 ST r11, r10
+	 ADDI_PTR r10, sp, (2 * REGSIZE)
+	}
+	{
+	 ST r10, r0
+	 ADDI_PTR r10, sp, (3 * REGSIZE)
+	}
+	ST r10, r1
+
+	/* Save the current context.  */
+	jal __getcontext
+	
+	/* Tear down the frame and restore r0, r1, and lr. */
+	{
+	 BNEZ r0, .Lerror
+	 ADDI_PTR r1, sp, 3 * REGSIZE
+	}
+	{
+	 LD r1, r1
+	 ADDI_PTR r0, sp, 2 * REGSIZE
+	}
+	{
+	 LD r0, r0
+	 ADDI_PTR sp, sp, 4 * REGSIZE
+	}
+	cfi_def_cfa_offset (0)
+	{
+	 LD lr, sp
+	 ADDLI_PTR r10, r0, UC_REG(54)
+	}
+
+	/* Update the stored sp and lr.  */
+	{
+	 ST r10, sp
+	 ADDLI_PTR r10, r0, UC_REG(55)
+	}
+	ST r10, lr
+
+	/* Tail-call setcontext to finish up.  */
+	{
+	 move r0, r1
+	 j __setcontext
+	}
+
+.Lerror:
+	ADDI_PTR sp, sp, 4 * REGSIZE
+	cfi_def_cfa_offset (0)
+	LD lr, sp
+	jrp lr
+END (__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)