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/* Get previous frame state for an existing frame state.
Copyright (C) 2016 The Qt Company Ltd.
This file is part of elfutils.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
elfutils 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
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <assert.h>
#define BACKEND aarch64_
#include "libebl_CPU.h"
#include <stdio.h>
/* There was no CFI. Maybe we happen to have a frame pointer and can unwind from that? */
bool
aarch64_unwind (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr pc __attribute__ ((unused)),
ebl_tid_registers_t *setfunc, ebl_tid_registers_get_t *getfunc,
ebl_pid_memory_read_t *readfunc, void *arg, bool *signal_framep)
{
const int fpReg = 29;
const int lrReg = 30;
const int spReg = 31;
Dwarf_Word fp;
if (!getfunc(fpReg, 1, &fp, arg) || fp == 0)
return false;
Dwarf_Word lr;
if (!getfunc(lrReg, 1, &lr, arg))
return false;
Dwarf_Word newFp, newLr;
if (!readfunc(fp, &newFp, arg))
return false;
fp += 8;
if (!readfunc(fp, &newLr, arg))
return false;
fp += 8;
if (!setfunc(spReg, 1, &fp, arg))
return false;
if (!setfunc(fpReg, 1, &newFp, arg))
return false;
if (!setfunc(-1, 1, &newLr, arg))
return false;
if (!setfunc(lrReg, 1, &newLr, arg))
return false;
*signal_framep = false;
return true;
}
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