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1 /* DWARF2 frame unwind data structure.
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2 Copyright (C) 1997-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* The result of interpreting the frame unwind info for a frame.
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26 This is all symbolic at this point, as none of the values can
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27 be resolved until the target pc is located. */
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28 typedef struct
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29 {
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30 /* Each register save state can be described in terms of a CFA slot,
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31 another register, or a location expression. */
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32 struct frame_state_reg_info
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33 {
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34 struct {
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35 union {
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36 _Unwind_Word reg;
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37 _Unwind_Sword offset;
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38 const unsigned char *exp;
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39 } loc;
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40 enum {
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41 REG_UNSAVED,
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42 REG_SAVED_OFFSET,
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43 REG_SAVED_REG,
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44 REG_SAVED_EXP,
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45 REG_SAVED_VAL_OFFSET,
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46 REG_SAVED_VAL_EXP,
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47 REG_UNDEFINED
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48 } how;
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49 } reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
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50
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51 /* Used to implement DW_CFA_remember_state. */
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52 struct frame_state_reg_info *prev;
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53
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54 /* The CFA can be described in terms of a reg+offset or a
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55 location expression. */
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56 _Unwind_Sword cfa_offset;
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57 _Unwind_Word cfa_reg;
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58 const unsigned char *cfa_exp;
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59 enum {
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60 CFA_UNSET,
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61 CFA_REG_OFFSET,
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62 CFA_EXP
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63 } cfa_how;
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64 } regs;
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65
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66 /* The PC described by the current frame state. */
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67 void *pc;
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68
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69 /* The information we care about from the CIE/FDE. */
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70 _Unwind_Personality_Fn personality;
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71 _Unwind_Sword data_align;
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72 _Unwind_Word code_align;
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73 _Unwind_Word retaddr_column;
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74 unsigned char fde_encoding;
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75 unsigned char lsda_encoding;
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76 unsigned char saw_z;
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77 unsigned char signal_frame;
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78 void *eh_ptr;
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79 } _Unwind_FrameState;
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80
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