add experimental aarch64 support

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

1 files changed, 57 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/aarch64/jmpbuf-offsets.h b/libc/sysdeps/linux/aarch64/jmpbuf-offsets.h
new file mode 100644
index 000000000..ab00cef26
--- /dev/null
+++ b/libc/sysdeps/linux/aarch64/jmpbuf-offsets.h
@@ -0,0 +1,57 @@
+/* Copyright (C) 2006-2016 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/>.  */
+
+#define JB_X19            0
+#define JB_X20            1
+#define JB_X21            2
+#define JB_X22            3
+#define JB_X23            4
+#define JB_X24            5
+#define JB_X25            6
+#define JB_X26            7
+#define JB_X27            8
+#define JB_X28            9
+#define JB_X29           10
+#define JB_LR            11
+#define JB_SP		 13
+
+#define JB_D8		 14
+#define JB_D9		 15
+#define JB_D10		 16
+#define JB_D11		 17
+#define JB_D12		 18
+#define JB_D13		 19
+#define JB_D14		 20
+#define JB_D15		 21
+
+#ifndef  __ASSEMBLER__
+#include <setjmp.h>
+#include <stdint.h>
+#include <sysdep.h>
+
+static inline uintptr_t __attribute__ ((unused))
+_jmpbuf_sp (__jmp_buf jmpbuf)
+{
+  uintptr_t sp = jmpbuf[JB_SP];
+  return sp;
+}
+#endif
+
+/* Helper for generic ____longjmp_chk(). */
+#define JB_FRAME_ADDRESS(buf) \
+  ((void *) _jmpbuf_sp (buf))