1 files changed, 89 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/aarch64/setcontext.S b/sysdeps/unix/sysv/linux/aarch64/setcontext.S
new file mode 100644
index 0000000000..d220c41f67
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/setcontext.S
@@ -0,0 +1,89 @@
+/* Set current context.
+
+   Copyright (C) 2009-2014 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.
+
+   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"
+#include "ucontext-internal.h"
+
+/* int setcontext (const ucontext_t *ucp) */
+
+	.text
+
+ENTRY(__setcontext)
+
+	/* Create a signal frame on the stack:
+
+		fp
+		lr
+		...
+	   sp-> rt_sigframe
+	 */
+
+	stp     x29, x30, [sp, -16]!
+	cfi_adjust_cfa_offset (16)
+	cfi_rel_offset (x29, 0)
+	cfi_rel_offset (x30, 8)
+
+        mov     x29, sp
+	cfi_def_cfa_register (x29)
+
+	/* Allocate space for the sigcontext.  */
+	mov	w3, #((RT_SIGFRAME_SIZE + SP_ALIGN_SIZE) & SP_ALIGN_MASK)
+	sub	sp, sp,	x3
+
+	/* Compute the base address of the ucontext structure.  */
+	add	x1, sp, #RT_SIGFRAME_UCONTEXT
+
+	/* Only ucontext is required in the frame, *copy* it in.  */
+
+#if UCONTEXT_SIZE % 16
+#error The implementation of setcontext.S assumes sizeof(ucontext_t) % 16 == 0
+#endif
+
+	mov	x2, #UCONTEXT_SIZE / 16
+0:
+	ldp	x3, x4, [x0], #16
+	stp	x3, x4, [x1], #16
+	sub	x2, x2, 1
+	cbnz	x2, 0b
+
+	/* rt_sigreturn () -- no arguments, sp points to struct rt_sigframe.  */
+	mov	x8, SYS_ify (rt_sigreturn)
+	svc	0
+
+	/* Ooops we failed.  Recover the stack */
+
+	mov	sp, x29
+	cfi_def_cfa_register (sp)
+
+        ldp     x29, x30, [sp], 16
+	cfi_adjust_cfa_offset (16)
+	cfi_restore (x29)
+	cfi_restore (x30)
+	b	C_SYMBOL_NAME(__syscall_error)
+
+PSEUDO_END (__setcontext)
+weak_alias (__setcontext, setcontext)
+
+ENTRY(__startcontext)
+	mov	x0, x19
+	cbnz	x0, __setcontext
+1:	b       HIDDEN_JUMPTARGET(_exit)
+END(__startcontext)