/* _Unwind_Resume wrapper for ARM EABI.

   Copyright (C) 2015-2018 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>

/* This is just implementing exactly what the C version does.

   We do it in assembly just to ensure that we get an unmolested tail

   call to the libgcc function, which is necessary for the ARM unwinder.  */

ENTRY (_Unwind_Resume)

	LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0)

	cmp	ip, #0

	beq	1f

0:	PTR_DEMANGLE (ip, ip, r2, r3)

	bx	ip

	/* We need to save and restore LR (for our own return address)

	   and R0 (for the argument to _Unwind_Resume) around the call.  */

1:	push	{r0, lr}

	cfi_adjust_cfa_offset (8)

	cfi_rel_offset (r0, 0)

	cfi_rel_offset (lr, 4)

	bl	__libgcc_s_init

	pop	{r0, lr}

	cfi_adjust_cfa_offset (-8)

	cfi_restore (r0)

	cfi_restore (lr)

	LDR_HIDDEN (ip, ip, __libgcc_s_resume, 0)

	b	0b

END (_Unwind_Resume)