gdb/trad-frame.h

   1 /* Traditional frame unwind support, for GDB the GNU Debugger.
   2
   3    Copyright 2003, 2004 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   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.
  11
  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.
  16
  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.  */
  21
  22 #ifndef TRAD_FRAME_H
  23 #define TRAD_FRAME_H
  24
  25 #include "frame.h"              /* For "struct frame_id".  */
  26
  27 struct frame_info;
  28 struct trad_frame_cache;
  29
  30 /* A simple, or traditional frame cache.
  31
  32    The entire cache is populated in a single pass and then generic
  33    routines are used to extract the various cache values.  */
  34
  35 struct trad_frame_cache *trad_frame_cache_zalloc (struct frame_info *next_frame);
  36
  37 /* This frame's ID.  */
  38 void trad_frame_set_id (struct trad_frame_cache *this_trad_cache,
  39                         struct frame_id this_id);
  40 void trad_frame_get_id (struct trad_frame_cache *this_trad_cache,
  41                         struct frame_id *this_id);
  42 void trad_frame_set_this_base (struct trad_frame_cache *this_trad_cache,
  43                                CORE_ADDR this_base);
  44 CORE_ADDR trad_frame_get_this_base (struct trad_frame_cache *this_trad_cache);
  45
  46 void trad_frame_set_reg_realreg (struct trad_frame_cache *this_trad_cache,
  47                                  int regnum, int realreg);
  48 void trad_frame_set_reg_unknown (struct trad_frame_cache *this_trad_cache,
  49                                  int regnum, CORE_ADDR addr);
  50 void trad_frame_set_reg_addr (struct trad_frame_cache *this_trad_cache,
  51                               int regnum, CORE_ADDR addr);
  52 void trad_frame_set_reg_value (struct trad_frame_cache *this_cache,
  53                                int regnum, LONGEST val);
  54
  55 void trad_frame_get_register (struct trad_frame_cache *this_trad_cache,
  56                               struct frame_info *next_frame,
  57                               int regnum, int *optimizedp,
  58                               enum lval_type *lvalp, CORE_ADDR *addrp,
  59                               int *realregp, gdb_byte *bufferp);
  60
  61 /* A traditional saved regs table, indexed by REGNUM, encoding where
  62    the value of REGNUM for the previous frame can be found in this
  63    frame.
  64
  65    The table is initialized with an identity encoding (ADDR == -1,
  66    REALREG == REGNUM) indicating that the value of REGNUM in the
  67    previous frame can be found in register REGNUM (== REALREG) in this
  68    frame.
  69
  70    The initial encoding can then be changed:
  71
  72    Modify ADDR (REALREG >= 0, ADDR != -1) to indicate that the value
  73    of register REGNUM in the previous frame can be found in memory at
  74    ADDR in this frame (addr_p, !realreg_p, !value_p).
  75
  76    Modify REALREG (REALREG >= 0, ADDR == -1) to indicate that the
  77    value of register REGNUM in the previous frame is found in register
  78    REALREG in this frame (!addr_p, realreg_p, !value_p).
  79
  80    Call trad_frame_set_value (REALREG == -1) to indicate that the
  81    value of register REGNUM in the previous frame is found in ADDR
  82    (!addr_p, !realreg_p, value_p).
  83
  84    Call trad_frame_set_unknown (REALREG == -2) to indicate that the
  85    register's value is not known.  */
  86
  87 struct trad_frame_saved_reg
  88 {
  89   LONGEST addr; /* A CORE_ADDR fits in a longest.  */
  90   int realreg;
  91 };
  92
  93 /* Encode REGNUM value in the trad-frame.  */
  94 void trad_frame_set_value (struct trad_frame_saved_reg this_saved_regs[],
  95                            int regnum, LONGEST val);
  96
  97 /* Mark REGNUM as unknown.  */
  98 void trad_frame_set_unknown (struct trad_frame_saved_reg this_saved_regs[],
  99                              int regnum);
 100
 101 /* Convenience functions, return non-zero if the register has been
 102    encoded as specified.  */
 103 int trad_frame_value_p (struct trad_frame_saved_reg this_saved_regs[],
 104                         int regnum);
 105 int trad_frame_addr_p (struct trad_frame_saved_reg this_saved_regs[],
 106                        int regnum);
 107 int trad_frame_realreg_p (struct trad_frame_saved_reg this_saved_regs[],
 108                           int regnum);
 109
 110
 111 /* Return a freshly allocated (and initialized) trad_frame array.  */
 112 struct trad_frame_saved_reg *trad_frame_alloc_saved_regs (struct frame_info *next_frame);
 113
 114 /* Given the trad_frame info, return the location of the specified
 115    register.  */
 116 void trad_frame_get_prev_register (struct frame_info *next_frame,
 117                                    struct trad_frame_saved_reg this_saved_regs[],
 118                                    int regnum, int *optimizedp,
 119                                    enum lval_type *lvalp, CORE_ADDR *addrp,
 120                                    int *realregp, gdb_byte *bufferp);
 121
 122 #endif