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-rw-r--r--sysdeps/unix/sysv/linux/tile/swapcontext.S89
1 files changed, 89 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tile/swapcontext.S b/sysdeps/unix/sysv/linux/tile/swapcontext.S
new file mode 100644
index 0000000000..ef24e39898
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tile/swapcontext.S
@@ -0,0 +1,89 @@
+/* Copyright (C) 2011-2014 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)