c689142bec
* frame.h (frame_id_unwind): Declare. (struct frame_info): Add fields id_unwind, id_unwind_cache_p and id_unwind_cache. (frame_id_unwind_ftype): Declare. * frame.c (frame_id_unwind): New function. (set_unwind_by_pc): Add unwind_id parameter. Initialized. (create_new_frame, get_prev_frame): Pass id_unwind to set_unwind_by_pc. (frame_saved_regs_id_unwind): New function. (frame_saved_regs_id_unwind): New function. * dummy-frame.c (dummy_frame_id_unwind): New function. (struct dummy_frame): Add field id. (generic_push_dummy_frame): Initialize `id'. * dummy-frame.h (dummy_frame_id_unwind): Declare.
102 lines
3.9 KiB
C
102 lines
3.9 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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/* 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, CALL_DUMMY_LENGTH to
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zero, and CALL_DUMMY_LOCATION to AT_ENTRY. Then you must remember
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to define PUSH_RETURN_ADDRESS, because no call instruction will be
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being executed by the target. Also FRAME_CHAIN_VALID as
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generic_{file,func}_frame_chain_valid and FIX_CALL_DUMMY as
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generic_fix_call_dummy. */
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/* Assuming that FRAME is a dummy, return a register value for the
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previous frame. */
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extern void dummy_frame_register_unwind (struct frame_info *frame,
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void **unwind_cache,
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int regnum,
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int *optimized,
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enum lval_type *lvalp,
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CORE_ADDR *addrp,
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int *realnump,
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void *valuep);
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/* Assuming that FRAME is a dummy, return the resume address for the
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previous frame. */
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extern CORE_ADDR dummy_frame_pc_unwind (struct frame_info *frame,
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void **unwind_cache);
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/* Assuming that FRAME is a dummy, return the ID of the calling frame
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(the frame that the dummy has the saved state of). */
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extern struct frame_id dummy_frame_id_unwind (struct frame_info *frame,
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void **unwind_cache);
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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 *generic_find_dummy_frame (CORE_ADDR pc,
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CORE_ADDR fp);
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#endif /* !defined (DUMMY_FRAME_H) */
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