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1 /* DWARF2 frame unwind data structure for Xtensa.
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2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2007, 2008,
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3 2009 Free Software Foundation, Inc.
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4
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5 This file is part of GCC.
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6
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7 GCC is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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15 License for more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* A target can override (perhaps for backward compatibility) how
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27 many dwarf2 columns are unwound. */
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28 #ifndef DWARF_FRAME_REGISTERS
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29 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
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30 #endif
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31
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32 /* Xtensa's variable-size register window save areas can be unwound without
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33 any unwind info. This is a stripped down version of the standard DWARF
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34 _Unwind_FrameState. */
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35 typedef struct
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36 {
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37 /* The information we care about from the CIE/FDE. */
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38 _Unwind_Personality_Fn personality;
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39 _Unwind_Word retaddr_column;
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40 unsigned char fde_encoding;
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41 unsigned char lsda_encoding;
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42 unsigned char saw_z;
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43 unsigned char signal_frame;
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44 void *eh_ptr;
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45
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46 /* Saved registers for a signal frame. */
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47 _Unwind_Word *signal_regs;
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48 _Unwind_Word signal_ra;
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49 } _Unwind_FrameState;
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50
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