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83 lines
2.4 KiB
83 lines
2.4 KiB
/* 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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