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a0f267c7 AC |
1 | /* Traditional frame unwind support, for GDB the GNU Debugger. |
2 | ||
3 | Copyright 2003 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #ifndef TRAD_FRAME_H | |
23 | #define TRAD_FRAME_H | |
24 | ||
2cdf3c63 AC |
25 | struct frame_info; |
26 | ||
8983bd83 AC |
27 | /* A traditional saved regs table, indexed by REGNUM, encoding where |
28 | the value of REGNUM for the previous frame can be found in this | |
29 | frame. | |
30 | ||
31 | The table is initialized with an identity encoding (ADDR == 0, | |
32 | REALNUM == REGNUM) indicating that the value of REGNUM in the | |
33 | previous frame can be found in register REGNUM (== REALNUM) in this | |
34 | frame. | |
35 | ||
36 | The initial encoding can then be changed: | |
37 | ||
38 | Modify ADDR (REALNUM >= 0, ADDR != 0) to indicate that the value of | |
39 | register REGNUM in the previous frame can be found in memory at | |
40 | ADDR in this frame. | |
41 | ||
42 | Modify REALNUM (REALNUM >= 0, ADDR == 0) to indicate that the value | |
43 | of register REGNUM in the previous frame is found in register | |
44 | REALNUM in this frame. | |
45 | ||
46 | Call trad_frame_register_value (REALNUM < 0) to indicate that the | |
47 | value of register REGNUM in the previous frame is found in ADDR. */ | |
48 | ||
49 | struct trad_frame_saved_reg | |
a0f267c7 | 50 | { |
8983bd83 AC |
51 | LONGEST addr; /* A CORE_ADDR fits in a longest. */ |
52 | int realnum; | |
a0f267c7 AC |
53 | }; |
54 | ||
8983bd83 AC |
55 | /* Convenience function, encode REGNUM's location in the trad-frame. */ |
56 | void trad_frame_register_value (struct trad_frame_saved_reg this_saved_regs[], | |
a0f267c7 AC |
57 | int regnum, LONGEST val); |
58 | ||
59 | /* Return a freshly allocated (and initialized) trad_frame array. */ | |
8983bd83 | 60 | struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *next_frame); |
a0f267c7 AC |
61 | |
62 | /* Given the trad_frame info, return the location of the specified | |
63 | register. */ | |
64 | void trad_frame_prev_register (struct frame_info *next_frame, | |
8983bd83 | 65 | struct trad_frame_saved_reg this_saved_regs[], |
a0f267c7 AC |
66 | int regnum, int *optimizedp, |
67 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
68 | int *realnump, void *bufferp); | |
69 | ||
70 | #endif |