add experimental aarch64 support

Ported over from GNU C Library and runtime tested in Qemu.

1 files changed, 59 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/aarch64/setjmp.S b/libc/sysdeps/linux/aarch64/setjmp.S
new file mode 100644
index 000000000..b3d616222
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/setjmp.S
@@ -0,0 +1,59 @@
+/* Copyright (C) 1997-2016 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 <jmpbuf-offsets.h>
+
+        /* Keep traditional entry points in with sigsetjmp(). */
+ENTRY (setjmp)
+	mov	x1, #1
+	b	1f
+END (setjmp)
+
+ENTRY (_setjmp)
+	mov	x1, #0
+	b	1f
+END (_setjmp)
+libc_hidden_def (_setjmp)
+
+ENTRY (__sigsetjmp)
+
+1:
+	stp	x19, x20, [x0, #JB_X19<<3]
+	stp	x21, x22, [x0, #JB_X21<<3]
+	stp	x23, x24, [x0, #JB_X23<<3]
+	stp	x25, x26, [x0, #JB_X25<<3]
+	stp	x27, x28, [x0, #JB_X27<<3]
+
+	stp	x29, x30, [x0, #JB_X29<<3]
+
+	/* setjmp probe takes 3 arguments, address of jump buffer
+	   first argument (8@x0), return value second argument (-4@x1),
+	   and target address (8@x30), respectively.  */
+	//LIBC_PROBE (setjmp, 3, 8@x0, -4@x1, 8@x30)
+	stp	 d8,  d9, [x0, #JB_D8<<3]
+	stp	d10, d11, [x0, #JB_D10<<3]
+	stp	d12, d13, [x0, #JB_D12<<3]
+	stp	d14, d15, [x0, #JB_D14<<3]
+	mov	x2,  sp
+	str	x2,  [x0, #JB_SP<<3]
+
+	b	C_SYMBOL_NAME(__sigjmp_save)
+
+END (__sigsetjmp)
+hidden_def (__sigsetjmp)