]>
Commit | Line | Data |
---|---|---|
9c1412c1 AC |
1 | /* Code dealing with dummy stack frames, for GDB, the GNU debugger. |
2 | ||
3 | Copyright 2002 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 | #if !defined (DUMMY_FRAME_H) | |
23 | #define DUMMY_FRAME_H 1 | |
24 | ||
25 | struct frame_info; | |
26 | struct regcache; | |
27 | ||
28 | /* GENERIC DUMMY FRAMES | |
29 | ||
30 | The following code serves to maintain the dummy stack frames for | |
31 | inferior function calls (ie. when gdb calls into the inferior via | |
32 | call_function_by_hand). This code saves the machine state before | |
33 | the call in host memory, so we must maintain an independent stack | |
34 | and keep it consistant etc. I am attempting to make this code | |
35 | generic enough to be used by many targets. | |
36 | ||
37 | The cheapest and most generic way to do CALL_DUMMY on a new target | |
38 | is probably to define CALL_DUMMY to be empty, CALL_DUMMY_LENGTH to | |
39 | zero, and CALL_DUMMY_LOCATION to AT_ENTRY. Then you must remember | |
40 | to define PUSH_RETURN_ADDRESS, because no call instruction will be | |
41 | being executed by the target. Also FRAME_CHAIN_VALID as | |
42 | generic_{file,func}_frame_chain_valid and FIX_CALL_DUMMY as | |
43 | generic_fix_call_dummy. */ | |
44 | ||
45 | /* Assuming that FRAME is a dummy, return a register value for the | |
46 | previous frame. */ | |
47 | ||
8779790c AC |
48 | extern void dummy_frame_register_unwind (struct frame_info *frame, |
49 | void **unwind_cache, | |
50 | int regnum, | |
51 | int *optimized, | |
52 | enum lval_type *lvalp, | |
53 | CORE_ADDR *addrp, | |
54 | int *realnump, | |
55 | void *valuep); | |
9c1412c1 | 56 | |
f18c5a73 AC |
57 | /* Assuming that FRAME is a dummy, return the resume address for the |
58 | previous frame. */ | |
59 | ||
60 | extern CORE_ADDR dummy_frame_pc_unwind (struct frame_info *frame, | |
61 | void **unwind_cache); | |
62 | ||
c689142b AC |
63 | /* Assuming that FRAME is a dummy, return the ID of the calling frame |
64 | (the frame that the dummy has the saved state of). */ | |
65 | ||
66 | extern struct frame_id dummy_frame_id_unwind (struct frame_info *frame, | |
67 | void **unwind_cache); | |
68 | ||
5e0f933e AC |
69 | /* Does the PC fall in a dummy frame? |
70 | ||
71 | This function is used by "frame.c" when creating a new `struct | |
72 | frame_info'. | |
73 | ||
74 | Note that there is also very similar code in breakpoint.c (where | |
75 | the bpstat stop reason is computed). It is looking for a PC | |
76 | falling on a dummy_frame breakpoint. Perhaphs this, and that code | |
77 | should be combined? | |
78 | ||
79 | Architecture dependant code, that has access to a frame, should not | |
80 | use this function. Instead (get_frame_type() == DUMMY_FRAME) | |
81 | should be used. | |
82 | ||
83 | Hmm, but what about threads? When the dummy-frame code tries to | |
84 | relocate a dummy frame's saved registers it definitly needs to | |
85 | differentiate between threads (otherwize it will do things like | |
86 | clean-up the wrong threads frames). However, when just trying to | |
87 | identify a dummy-frame that shouldn't matter. The wost that can | |
88 | happen is that a thread is marked as sitting in a dummy frame when, | |
89 | in reality, its corrupted its stack, to the point that a PC is | |
90 | pointing into a dummy frame. */ | |
91 | ||
92 | extern int pc_in_dummy_frame (CORE_ADDR pc); | |
93 | ||
9c1412c1 AC |
94 | /* Return the regcache that belongs to the dummy-frame identifed by PC |
95 | and FP, or NULL if no such frame exists. */ | |
96 | /* FIXME: cagney/2002-11-08: The function only exists because of | |
97 | deprecated_generic_get_saved_register. Eliminate that function and | |
98 | this, to, can go. */ | |
99 | ||
100 | extern struct regcache *generic_find_dummy_frame (CORE_ADDR pc, | |
101 | CORE_ADDR fp); | |
9c1412c1 | 102 | #endif /* !defined (DUMMY_FRAME_H) */ |