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f8a57be8 | 1 | /* DWARF2 frame unwind data structure. |
54f5943c | 2 | Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2009 |
f8a57be8 GK |
3 | Free Software Foundation, Inc. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
748086b7 | 9 | the Free Software Foundation; either version 3, or (at your option) |
f8a57be8 GK |
10 | any later version. |
11 | ||
f8a57be8 GK |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT |
13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
15 | License for more details. | |
16 | ||
748086b7 JJ |
17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
f8a57be8 GK |
25 | |
26 | /* A target can override (perhaps for backward compatibility) how | |
27 | many dwarf2 columns are unwound. */ | |
28 | #ifndef DWARF_FRAME_REGISTERS | |
29 | #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER | |
30 | #endif | |
31 | ||
32 | /* The result of interpreting the frame unwind info for a frame. | |
33 | This is all symbolic at this point, as none of the values can | |
34 | be resolved until the target pc is located. */ | |
35 | typedef struct | |
36 | { | |
37 | /* Each register save state can be described in terms of a CFA slot, | |
38 | another register, or a location expression. */ | |
39 | struct frame_state_reg_info | |
40 | { | |
41 | struct { | |
42 | union { | |
43 | _Unwind_Word reg; | |
44 | _Unwind_Sword offset; | |
45 | const unsigned char *exp; | |
46 | } loc; | |
47 | enum { | |
48 | REG_UNSAVED, | |
49 | REG_SAVED_OFFSET, | |
50 | REG_SAVED_REG, | |
4469af7a JJ |
51 | REG_SAVED_EXP, |
52 | REG_SAVED_VAL_OFFSET, | |
54f5943c JJ |
53 | REG_SAVED_VAL_EXP, |
54 | REG_UNDEFINED | |
f8a57be8 GK |
55 | } how; |
56 | } reg[DWARF_FRAME_REGISTERS+1]; | |
57 | ||
58 | /* Used to implement DW_CFA_remember_state. */ | |
59 | struct frame_state_reg_info *prev; | |
f8a57be8 | 60 | |
6673f90b NF |
61 | /* The CFA can be described in terms of a reg+offset or a |
62 | location expression. */ | |
63 | _Unwind_Sword cfa_offset; | |
64 | _Unwind_Word cfa_reg; | |
65 | const unsigned char *cfa_exp; | |
66 | enum { | |
67 | CFA_UNSET, | |
68 | CFA_REG_OFFSET, | |
69 | CFA_EXP | |
70 | } cfa_how; | |
71 | } regs; | |
f8a57be8 GK |
72 | |
73 | /* The PC described by the current frame state. */ | |
74 | void *pc; | |
75 | ||
76 | /* The information we care about from the CIE/FDE. */ | |
77 | _Unwind_Personality_Fn personality; | |
78 | _Unwind_Sword data_align; | |
79 | _Unwind_Word code_align; | |
80 | _Unwind_Word retaddr_column; | |
81 | unsigned char fde_encoding; | |
82 | unsigned char lsda_encoding; | |
83 | unsigned char saw_z; | |
754e45a8 | 84 | unsigned char signal_frame; |
f8a57be8 GK |
85 | void *eh_ptr; |
86 | } _Unwind_FrameState; | |
87 |