1 /* Code dealing with dummy stack frames, for GDB, the GNU debugger.
3 Copyright 2002 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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. */
22 #if !defined (DUMMY_FRAME_H)
23 #define DUMMY_FRAME_H 1
30 /* GENERIC DUMMY FRAMES
32 The following code serves to maintain the dummy stack frames for
33 inferior function calls (ie. when gdb calls into the inferior via
34 call_function_by_hand). This code saves the machine state before
35 the call in host memory, so we must maintain an independent stack
36 and keep it consistant etc. I am attempting to make this code
37 generic enough to be used by many targets.
39 The cheapest and most generic way to do CALL_DUMMY on a new target
40 is probably to define CALL_DUMMY to be empty,
41 DEPRECATED_CALL_DUMMY_LENGTH to zero, and CALL_DUMMY_LOCATION to
42 AT_ENTRY. Then you must remember to define PUSH_RETURN_ADDRESS,
43 because no call instruction will be being executed by the target.
44 Also DEPRECATED_FRAME_CHAIN_VALID as
45 generic_{file,func}_frame_chain_valid and do not set
46 DEPRECATED_FIX_CALL_DUMMY. */
48 /* If the PC falls in a dummy frame, return a dummy frame
51 extern const struct frame_unwind
*dummy_frame_sniffer (struct frame_info
*next_frame
);
53 /* Does the PC fall in a dummy frame?
55 This function is used by "frame.c" when creating a new `struct
58 Note that there is also very similar code in breakpoint.c (where
59 the bpstat stop reason is computed). It is looking for a PC
60 falling on a dummy_frame breakpoint. Perhaphs this, and that code
63 Architecture dependant code, that has access to a frame, should not
64 use this function. Instead (get_frame_type() == DUMMY_FRAME)
67 Hmm, but what about threads? When the dummy-frame code tries to
68 relocate a dummy frame's saved registers it definitly needs to
69 differentiate between threads (otherwize it will do things like
70 clean-up the wrong threads frames). However, when just trying to
71 identify a dummy-frame that shouldn't matter. The wost that can
72 happen is that a thread is marked as sitting in a dummy frame when,
73 in reality, its corrupted its stack, to the point that a PC is
74 pointing into a dummy frame. */
76 extern int pc_in_dummy_frame (CORE_ADDR pc
);
78 /* Return the regcache that belongs to the dummy-frame identifed by PC
79 and FP, or NULL if no such frame exists. */
80 /* FIXME: cagney/2002-11-08: The function only exists because of
81 deprecated_generic_get_saved_register. Eliminate that function and
84 extern struct regcache
*deprecated_find_dummy_frame_regcache (CORE_ADDR pc
,
86 #endif /* !defined (DUMMY_FRAME_H) */
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