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/* Traditional frame unwind support, for GDB the GNU Debugger.
Copyright 2003, 2004 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef TRAD_FRAME_H
#define TRAD_FRAME_H
struct frame_info;
struct trad_frame;
#include "frame.h" /* For frame_id. */
/* A traditional saved regs table, indexed by REGNUM, encoding where
the value of REGNUM for the previous frame can be found in this
frame.
The table is initialized with an identity encoding (ADDR == -1,
REALREG == REGNUM) indicating that the value of REGNUM in the
previous frame can be found in register REGNUM (== REALREG) in this
frame.
The initial encoding can then be changed:
Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value
of register REGNUM in the previous frame can be found in memory at
ADDR in this frame (addr_p, !realreg_p, !value_p).
Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the
value of register REGNUM in the previous frame is found in register
REALREG in this frame (!addr_p, realreg_p, !value_p).
Call trad_frame_set_value (REALREG == -1) to indicate that the
value of register REGNUM in the previous frame is found in ADDR
(!addr_p, !realreg_p, value_p).
Call trad_frame_set_unknown (REALREG == -2) to indicate that the
register's value is not known. */
struct trad_frame_saved_reg
{
LONGEST addr; /* A CORE_ADDR fits in a longest. */
int realreg;
};
struct trad_frame_cache
{
struct frame_id this_id;
CORE_ADDR this_base;
struct trad_frame_saved_reg *prev_regs;
};
/* Encode REGNUM's value in the trad-frame. */
void trad_frame_set_value (struct trad_frame_cache *this_cache,
int regnum, LONGEST val);
void trad_frame_set_addr (struct trad_frame_cache *this_cache,
int regnum, CORE_ADDR addr);
void trad_frame_set_realreg (struct trad_frame_cache *this_cache,
int regnum, int realreg);
void trad_frame_set_unknown (struct trad_frame_cache *this_cache,
int regnum);
/* Set the offset of a register, and then update all offsets. Useful
when the offset of a register is known before its absolute
address. */
void trad_frame_set_offset (struct trad_frame_cache *this_cache,
int regnum, LONGEST addr);
void trad_frame_add_addr (struct trad_frame_cache *this_cache,
int regnum, CORE_ADDR addr);
/* Convenience functions, return non-zero if the register has been
encoded as specified. */
int trad_frame_value_p (struct trad_frame_cache *this_cache,
int regnum);
int trad_frame_addr_p (struct trad_frame_cache *this_cache,
int regnum);
int trad_frame_realreg_p (struct trad_frame_cache *this_cache,
int regnum);
typedef void (trad_frame_init_ftype) (const struct trad_frame *self,
struct frame_info *next_frame,
struct trad_frame_cache *this_cache);
typedef int (trad_frame_sniffer_ftype) (const struct trad_frame *self,
struct frame_info *next_frame);
struct trad_frame
{
enum frame_type type;
trad_frame_sniffer_ftype *sniffer;
trad_frame_init_ftype *init;
const struct trad_frame_data *trad_data;
};
void trad_frame_append (struct gdbarch *gdbarch,
const struct trad_frame *trad_frame);
#endif
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