47 lines
1.5 KiB
ArmAsm
47 lines
1.5 KiB
ArmAsm
/* _Unwind_Resume wrapper for ARM EABI.
|
|
Copyright (C) 2015-2022 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* This is equivalent to the following C implementation:
|
|
|
|
void
|
|
_Unwind_Resume (struct _Unwind_Exception *exc)
|
|
{
|
|
__unwind_link_get_resume () (exc);
|
|
}
|
|
|
|
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)
|
|
/* We need to save and restore LR (for our own return address)
|
|
and R0 (for the argument to _Unwind_Resume) around the call. */
|
|
push {r0, lr}
|
|
cfi_adjust_cfa_offset (8)
|
|
cfi_rel_offset (r0, 0)
|
|
cfi_rel_offset (lr, 4)
|
|
bl __unwind_link_get_resume
|
|
mov r3, r0
|
|
pop {r0, lr}
|
|
cfi_adjust_cfa_offset (-8)
|
|
cfi_restore (r4)
|
|
cfi_restore (lr)
|
|
bx r3
|
|
END (_Unwind_Resume)
|