87 lines
3.4 KiB
C
87 lines
3.4 KiB
C
/* Code dealing with dummy stack frames, for GDB, the GNU debugger.
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Copyright 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#if !defined (DUMMY_FRAME_H)
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#define DUMMY_FRAME_H 1
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struct frame_info;
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struct regcache;
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struct frame_unwind;
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struct frame_id;
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/* GENERIC DUMMY FRAMES
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The following code serves to maintain the dummy stack frames for
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inferior function calls (ie. when gdb calls into the inferior via
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call_function_by_hand). This code saves the machine state before
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the call in host memory, so we must maintain an independent stack
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and keep it consistant etc. I am attempting to make this code
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generic enough to be used by many targets.
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The cheapest and most generic way to do CALL_DUMMY on a new target
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is probably to define CALL_DUMMY to be empty,
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DEPRECATED_CALL_DUMMY_LENGTH to zero, and CALL_DUMMY_LOCATION to
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AT_ENTRY. Then you must remember to define PUSH_RETURN_ADDRESS,
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because no call instruction will be being executed by the target.
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Also DEPRECATED_FRAME_CHAIN_VALID as
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generic_{file,func}_frame_chain_valid and do not set
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DEPRECATED_FIX_CALL_DUMMY. */
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/* If the PC falls in a dummy frame, return a dummy frame
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unwinder. */
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extern const struct frame_unwind *dummy_frame_sniffer (struct frame_info *next_frame);
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/* Does the PC fall in a dummy frame?
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This function is used by "frame.c" when creating a new `struct
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frame_info'.
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Note that there is also very similar code in breakpoint.c (where
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the bpstat stop reason is computed). It is looking for a PC
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falling on a dummy_frame breakpoint. Perhaphs this, and that code
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should be combined?
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Architecture dependant code, that has access to a frame, should not
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use this function. Instead (get_frame_type() == DUMMY_FRAME)
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should be used.
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Hmm, but what about threads? When the dummy-frame code tries to
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relocate a dummy frame's saved registers it definitly needs to
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differentiate between threads (otherwize it will do things like
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clean-up the wrong threads frames). However, when just trying to
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identify a dummy-frame that shouldn't matter. The wost that can
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happen is that a thread is marked as sitting in a dummy frame when,
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in reality, its corrupted its stack, to the point that a PC is
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pointing into a dummy frame. */
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extern int pc_in_dummy_frame (CORE_ADDR pc);
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/* Return the regcache that belongs to the dummy-frame identifed by PC
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and FP, or NULL if no such frame exists. */
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/* FIXME: cagney/2002-11-08: The function only exists because of
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deprecated_generic_get_saved_register. Eliminate that function and
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this, to, can go. */
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extern struct regcache *deprecated_find_dummy_frame_regcache (CORE_ADDR pc,
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CORE_ADDR fp);
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#endif /* !defined (DUMMY_FRAME_H) */
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