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- /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
- Copyright 1986, 1989, 1991, 1992 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #if !defined (FRAME_H)
- #define FRAME_H 1
-
- /* A FRAME identifies a specific stack frame. It is not constant over
- calls to the inferior (frame addresses are, see below).
-
- This is implemented as a "struct frame_info *". This file and
- blockframe.c are the only places which are allowed to use the
- equivalence between FRAME and struct frame_info *. Exception:
- Prototypes in other files use "struct frame_info *" because this
- file might not be included.
-
- The distinction between a FRAME and a "struct frame_info *" is made
- with the idea of maybe someday changing a FRAME to be something else,
- but seems to me that a "struct frame_info *" is fully general (since
- any necessarily fields can be added; changing the meaning of existing
- fields is not helped by the FRAME distinction), and this distinction
- merely creates unnecessary hair. -kingdon, 18 May 93. */
- typedef struct frame_info *FRAME;
-
- /* Convert from a "struct frame_info *" into a FRAME. */
- #define FRAME_INFO_ID(f) (f)
-
- /* Convert from a FRAME into a "struct frame_info *". */
- extern struct frame_info *
- get_frame_info PARAMS ((FRAME));
-
- /* Type of the address of a frame. It is widely assumed (at least in
- prototypes in headers which might not include this header) that
- this is the same as CORE_ADDR, and no one can think of a case in
- which it wouldn't be, so it might be best to remove this typedef. */
- typedef CORE_ADDR FRAME_ADDR;
-
- /* Convert from a FRAME into a frame address. Except in the
- machine-dependent *FRAME* macros, a frame address has no defined
- meaning other than as a magic cookie which identifies a frame over
- calls to the inferior. The only known exception is inferior.h
- (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
- assume that a frame address contains enough information to
- reconstruct the frame; if you want more than just to identify the
- frame (e.g. be able to fetch variables relative to that frame),
- then save the whole struct frame_info (and the next struct
- frame_info, since the latter is used for fetching variables on some
- machines). */
-
- #define FRAME_FP(fr) ((fr)->frame)
-
- /* We keep a cache of stack frames, each of which is a "struct
- frame_info". The innermost one gets allocated (in
- wait_for_inferior) each time the inferior stops; current_frame
- points to it. Additional frames get allocated (in
- get_prev_frame_info) as needed, and are chained through the next
- and prev fields. Any time that the frame cache becomes invalid
- (most notably when we execute something, but also if we change how
- we interpret the frames (e.g. "set heuristic-fence-post" in
- mips-tdep.c, or anything which reads new symbols)), we should call
- reinit_frame_cache. */
-
- struct frame_info
- {
- /* Nominal address of the frame described. See comments at FRAME_FP
- about what this means outside the *FRAME* macros; in the *FRAME*
- macros, it can mean whatever makes most sense for this machine. */
- FRAME_ADDR frame;
-
- /* Address at which execution is occurring in this frame.
- For the innermost frame, it's the current pc.
- For other frames, it is a pc saved in the next frame. */
- CORE_ADDR pc;
-
- /* Nonzero if this is a frame associated with calling a signal handler.
-
- Set by machine-dependent code. On some machines, if
- the machine-dependent code fails to check for this, the backtrace
- will look relatively normal. For example, on the i386
- #3 0x158728 in sighold ()
- On other machines (e.g. rs6000), the machine-dependent code better
- set this to prevent us from trying to print it like a normal frame. */
- int signal_handler_caller;
-
- /* Anything extra for this structure that may have been defined
- in the machine dependent files. */
- #ifdef EXTRA_FRAME_INFO
- EXTRA_FRAME_INFO
- #endif
-
- /* We should probably also store a "struct frame_saved_regs" here.
- This is already done by some machines (e.g. config/m88k/tm-m88k.h)
- but there is no reason it couldn't be general. */
-
- /* Pointers to the next and previous frame_info's in the frame cache. */
- FRAME next, prev;
- };
-
- /* Describe the saved registers of a frame. */
-
- struct frame_saved_regs
- {
-
- /* For each register, address of where it was saved on entry to
- the frame, or zero if it was not saved on entry to this frame.
- This includes special registers such as pc and fp saved in
- special ways in the stack frame. The SP_REGNUM is even more
- special, the address here is the sp for the next frame, not the
- address where the sp was saved. */
-
- CORE_ADDR regs[NUM_REGS];
- };
-
- /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
- targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
- is the outermost one and has no caller.
-
- If a particular target needs a different definition, then it can override
- the definition here by providing one in the tm file. */
-
- #if !defined (FRAME_CHAIN_VALID)
-
- #if defined (FRAME_CHAIN_VALID_ALTERNATE)
-
- /* Use the alternate method of avoiding running up off the end of the frame
- chain or following frames back into the startup code. See the comments
- in objfiles.h. */
-
- #define FRAME_CHAIN_VALID(chain, thisframe) \
- ((chain) != 0 \
- && !inside_main_func ((thisframe) -> pc) \
- && !inside_entry_func ((thisframe) -> pc))
-
- #else
-
- #define FRAME_CHAIN_VALID(chain, thisframe) \
- ((chain) != 0 \
- && !inside_entry_file (FRAME_SAVED_PC (thisframe)))
-
- #endif /* FRAME_CHAIN_VALID_ALTERNATE */
-
- #endif /* FRAME_CHAIN_VALID */
-
- /* The stack frame that the user has specified for commands to act on.
- Note that one cannot assume this is the address of valid data. */
-
- extern FRAME selected_frame;
-
- /* Level of the selected frame:
- 0 for innermost, 1 for its caller, ...
- or -1 for frame specified by address with no defined level. */
-
- extern int selected_frame_level;
-
- extern struct frame_info *
- get_prev_frame_info PARAMS ((FRAME));
-
- extern FRAME
- create_new_frame PARAMS ((FRAME_ADDR, CORE_ADDR));
-
- extern void
- flush_cached_frames PARAMS ((void));
-
- extern void
- reinit_frame_cache PARAMS ((void));
-
- extern void
- get_frame_saved_regs PARAMS ((struct frame_info *, struct frame_saved_regs *));
-
- extern void
- set_current_frame PARAMS ((FRAME));
-
- extern FRAME
- get_prev_frame PARAMS ((FRAME));
-
- extern FRAME
- get_current_frame PARAMS ((void));
-
- extern FRAME
- get_next_frame PARAMS ((FRAME));
-
- extern struct block *
- get_frame_block PARAMS ((FRAME));
-
- extern struct block *
- get_current_block PARAMS ((void));
-
- extern struct block *
- get_selected_block PARAMS ((void));
-
- extern struct symbol *
- get_frame_function PARAMS ((FRAME));
-
- extern CORE_ADDR
- get_frame_pc PARAMS ((FRAME));
-
- extern CORE_ADDR
- get_pc_function_start PARAMS ((CORE_ADDR));
-
- extern struct block * block_for_pc PARAMS ((CORE_ADDR));
-
- extern int frameless_look_for_prologue PARAMS ((FRAME));
-
- extern void print_frame_args PARAMS ((struct symbol *, struct frame_info *,
- int, GDB_FILE *));
-
- extern FRAME find_relative_frame PARAMS ((FRAME, int*));
-
- extern void print_stack_frame PARAMS ((FRAME, int, int));
-
- extern void select_frame PARAMS ((FRAME, int));
-
- extern void record_selected_frame PARAMS ((FRAME_ADDR *, int *));
-
- extern void print_frame_info PARAMS ((struct frame_info *, int, int, int));
-
- extern CORE_ADDR find_saved_register PARAMS ((FRAME, int));
-
- extern FRAME block_innermost_frame PARAMS ((struct block *));
-
- extern FRAME find_frame_addr_in_frame_chain PARAMS ((FRAME_ADDR));
-
- extern CORE_ADDR sigtramp_saved_pc PARAMS ((FRAME));
-
- #endif /* !defined (FRAME_H) */
-