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f8a57be8 | 1 | /* DWARF2 frame unwind data structure. |
7adcbafe | 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
f8a57be8 GK |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
748086b7 | 8 | the Free Software Foundation; either version 3, or (at your option) |
f8a57be8 GK |
9 | any later version. |
10 | ||
f8a57be8 GK |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
15 | ||
748086b7 JJ |
16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
f8a57be8 | 24 | |
146e4591 JJ |
25 | enum { |
26 | REG_UNSAVED, | |
27 | REG_SAVED_OFFSET, | |
28 | REG_SAVED_REG, | |
29 | REG_SAVED_EXP, | |
30 | REG_SAVED_VAL_OFFSET, | |
31 | REG_SAVED_VAL_EXP, | |
32 | REG_UNDEFINED | |
33 | }; | |
34 | ||
f8a57be8 GK |
35 | /* The result of interpreting the frame unwind info for a frame. |
36 | This is all symbolic at this point, as none of the values can | |
37 | be resolved until the target pc is located. */ | |
38 | typedef struct | |
39 | { | |
40 | /* Each register save state can be described in terms of a CFA slot, | |
41 | another register, or a location expression. */ | |
42 | struct frame_state_reg_info | |
43 | { | |
44 | struct { | |
45 | union { | |
46 | _Unwind_Word reg; | |
47 | _Unwind_Sword offset; | |
48 | const unsigned char *exp; | |
49 | } loc; | |
53d68b9f | 50 | } reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
146e4591 | 51 | unsigned char how[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
f8a57be8 | 52 | |
acdb2416 FW |
53 | enum { |
54 | CFA_UNSET, | |
55 | CFA_REG_OFFSET, | |
56 | CFA_EXP | |
57 | } cfa_how : 8; | |
58 | ||
f8a57be8 GK |
59 | /* Used to implement DW_CFA_remember_state. */ |
60 | struct frame_state_reg_info *prev; | |
f8a57be8 | 61 | |
6673f90b NF |
62 | /* The CFA can be described in terms of a reg+offset or a |
63 | location expression. */ | |
64 | _Unwind_Sword cfa_offset; | |
65 | _Unwind_Word cfa_reg; | |
66 | const unsigned char *cfa_exp; | |
6673f90b | 67 | } regs; |
f8a57be8 GK |
68 | |
69 | /* The PC described by the current frame state. */ | |
70 | void *pc; | |
71 | ||
72 | /* The information we care about from the CIE/FDE. */ | |
73 | _Unwind_Personality_Fn personality; | |
74 | _Unwind_Sword data_align; | |
75 | _Unwind_Word code_align; | |
76 | _Unwind_Word retaddr_column; | |
77 | unsigned char fde_encoding; | |
78 | unsigned char lsda_encoding; | |
79 | unsigned char saw_z; | |
754e45a8 | 80 | unsigned char signal_frame; |
f8a57be8 GK |
81 | void *eh_ptr; |
82 | } _Unwind_FrameState; | |
83 |