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1 /* DWARF2 frame unwind data structure.
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2 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2009
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3 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 /* The result of interpreting the frame unwind info for a frame.
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33 This is all symbolic at this point, as none of the values can
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34 be resolved until the target pc is located. */
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35 typedef struct
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36 {
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37 /* Each register save state can be described in terms of a CFA slot,
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38 another register, or a location expression. */
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39 struct frame_state_reg_info
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40 {
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41 struct {
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42 union {
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43 _Unwind_Word reg;
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44 _Unwind_Sword offset;
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45 const unsigned char *exp;
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46 } loc;
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47 enum {
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48 REG_UNSAVED,
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49 REG_SAVED_OFFSET,
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50 REG_SAVED_REG,
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51 REG_SAVED_EXP,
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52 REG_SAVED_VAL_OFFSET,
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53 REG_SAVED_VAL_EXP,
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54 REG_UNDEFINED
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55 } how;
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56 } reg[DWARF_FRAME_REGISTERS+1];
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57
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58 /* Used to implement DW_CFA_remember_state. */
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59 struct frame_state_reg_info *prev;
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60
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61 /* The CFA can be described in terms of a reg+offset or a
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62 location expression. */
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63 _Unwind_Sword cfa_offset;
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64 _Unwind_Word cfa_reg;
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65 const unsigned char *cfa_exp;
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66 enum {
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67 CFA_UNSET,
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68 CFA_REG_OFFSET,
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69 CFA_EXP
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70 } cfa_how;
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71 } regs;
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72
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73 /* The PC described by the current frame state. */
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74 void *pc;
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75
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76 /* The information we care about from the CIE/FDE. */
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77 _Unwind_Personality_Fn personality;
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78 _Unwind_Sword data_align;
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79 _Unwind_Word code_align;
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80 _Unwind_Word retaddr_column;
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81 unsigned char fde_encoding;
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82 unsigned char lsda_encoding;
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83 unsigned char saw_z;
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84 unsigned char signal_frame;
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85 void *eh_ptr;
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86 } _Unwind_FrameState;
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87
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