1/* _Unwind_Resume wrapper for ARM EABI.
2   Copyright (C) 2015-2022 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public License as
7   published by the Free Software Foundation; either version 2.1 of the
8   License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library.  If not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdep.h>
20
21/* This is equivalent to the following C implementation:
22
23   void
24   _Unwind_Resume (struct _Unwind_Exception *exc)
25   {
26     __unwind_link_get_resume () (exc);
27   }
28
29   We do it in assembly just to ensure that we get an unmolested tail
30   call to the libgcc function, which is necessary for the ARM unwinder.  */
31
32ENTRY (_Unwind_Resume)
33	/* We need to save and restore LR (for our own return address)
34	   and R0 (for the argument to _Unwind_Resume) around the call.  */
35	push	{r0, lr}
36	cfi_adjust_cfa_offset (8)
37	cfi_rel_offset (r0, 0)
38	cfi_rel_offset (lr, 4)
39	bl	__unwind_link_get_resume
40	mov	r3, r0
41	pop	{r0, lr}
42	cfi_adjust_cfa_offset (-8)
43	cfi_restore (r4)
44	cfi_restore (lr)
45	bx	r3
46END (_Unwind_Resume)
47