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60ea93bb | 1 | /* DWARF2 frame unwind data structure. |
fbd26352 | 2 | Copyright (C) 1997-2019 Free Software Foundation, Inc. |
60ea93bb | 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 | |
6bc9506f | 8 | the Free Software Foundation; either version 3, or (at your option) |
60ea93bb | 9 | any later version. |
10 | ||
60ea93bb | 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 | ||
6bc9506f | 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/>. */ | |
60ea93bb | 24 | |
60ea93bb | 25 | /* The result of interpreting the frame unwind info for a frame. |
26 | This is all symbolic at this point, as none of the values can | |
27 | be resolved until the target pc is located. */ | |
28 | typedef struct | |
29 | { | |
30 | /* Each register save state can be described in terms of a CFA slot, | |
31 | another register, or a location expression. */ | |
32 | struct frame_state_reg_info | |
33 | { | |
34 | struct { | |
35 | union { | |
36 | _Unwind_Word reg; | |
37 | _Unwind_Sword offset; | |
38 | const unsigned char *exp; | |
39 | } loc; | |
40 | enum { | |
41 | REG_UNSAVED, | |
42 | REG_SAVED_OFFSET, | |
43 | REG_SAVED_REG, | |
706f0818 | 44 | REG_SAVED_EXP, |
45 | REG_SAVED_VAL_OFFSET, | |
d02454a0 | 46 | REG_SAVED_VAL_EXP, |
47 | REG_UNDEFINED | |
60ea93bb | 48 | } how; |
325b8c3c | 49 | } reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1]; |
60ea93bb | 50 | |
51 | /* Used to implement DW_CFA_remember_state. */ | |
52 | struct frame_state_reg_info *prev; | |
60ea93bb | 53 | |
ad430e37 | 54 | /* The CFA can be described in terms of a reg+offset or a |
55 | location expression. */ | |
56 | _Unwind_Sword cfa_offset; | |
57 | _Unwind_Word cfa_reg; | |
58 | const unsigned char *cfa_exp; | |
59 | enum { | |
60 | CFA_UNSET, | |
61 | CFA_REG_OFFSET, | |
62 | CFA_EXP | |
63 | } cfa_how; | |
64 | } regs; | |
60ea93bb | 65 | |
66 | /* The PC described by the current frame state. */ | |
67 | void *pc; | |
68 | ||
69 | /* The information we care about from the CIE/FDE. */ | |
70 | _Unwind_Personality_Fn personality; | |
71 | _Unwind_Sword data_align; | |
72 | _Unwind_Word code_align; | |
73 | _Unwind_Word retaddr_column; | |
74 | unsigned char fde_encoding; | |
75 | unsigned char lsda_encoding; | |
76 | unsigned char saw_z; | |
15c73eb7 | 77 | unsigned char signal_frame; |
60ea93bb | 78 | void *eh_ptr; |
79 | } _Unwind_FrameState; | |
80 |