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84 lines
2.4 KiB
84 lines
2.4 KiB
4 months ago
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/* Get previous frame state for an existing frame state.
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Copyright (C) 2016 The Qt Company Ltd.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#define BACKEND aarch64_
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#define FP_REG 29
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#define LR_REG 30
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#define SP_REG 31
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#define FP_OFFSET 0
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#define LR_OFFSET 8
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#define SP_OFFSET 16
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#include "libebl_CPU.h"
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/* There was no CFI. Maybe we happen to have a frame pointer and can unwind from that? */
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bool
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EBLHOOK(unwind) (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr pc __attribute__ ((unused)),
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ebl_tid_registers_t *setfunc, ebl_tid_registers_get_t *getfunc,
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ebl_pid_memory_read_t *readfunc, void *arg,
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bool *signal_framep __attribute__ ((unused)))
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{
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Dwarf_Word fp, lr, sp;
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if (!getfunc(LR_REG, 1, &lr, arg))
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return false;
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if (lr == 0 || !setfunc(-1, 1, &lr, arg))
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return false;
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if (!getfunc(FP_REG, 1, &fp, arg))
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fp = 0;
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if (!getfunc(SP_REG, 1, &sp, arg))
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sp = 0;
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Dwarf_Word newLr, newFp, newSp;
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if (!readfunc(fp + LR_OFFSET, &newLr, arg))
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newLr = 0;
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if (!readfunc(fp + FP_OFFSET, &newFp, arg))
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newFp = 0;
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newSp = fp + SP_OFFSET;
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// These are not fatal if they don't work. They will just prevent unwinding at the next frame.
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setfunc(LR_REG, 1, &newLr, arg);
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setfunc(FP_REG, 1, &newFp, arg);
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setfunc(SP_REG, 1, &newSp, arg);
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// If the fp is invalid, we might still have a valid lr.
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// But if the fp is valid, then the stack should be moving in the right direction.
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return fp == 0 || newSp > sp;
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}
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