gdb/dummy-frame.h

   1 /* Code dealing with dummy stack frames, for GDB, the GNU debugger.
   2
   3    Copyright 2002 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 #if !defined (DUMMY_FRAME_H)
  23 #define DUMMY_FRAME_H 1
  24
  25 struct frame_info;
  26 struct regcache;
  27
  28 /* GENERIC DUMMY FRAMES
  29
  30    The following code serves to maintain the dummy stack frames for
  31    inferior function calls (ie. when gdb calls into the inferior via
  32    call_function_by_hand).  This code saves the machine state before
  33    the call in host memory, so we must maintain an independent stack
  34    and keep it consistant etc.  I am attempting to make this code
  35    generic enough to be used by many targets.
  36
  37    The cheapest and most generic way to do CALL_DUMMY on a new target
  38    is probably to define CALL_DUMMY to be empty, CALL_DUMMY_LENGTH to
  39    zero, and CALL_DUMMY_LOCATION to AT_ENTRY.  Then you must remember
  40    to define PUSH_RETURN_ADDRESS, because no call instruction will be
  41    being executed by the target.  Also FRAME_CHAIN_VALID as
  42    generic_{file,func}_frame_chain_valid and FIX_CALL_DUMMY as
  43    generic_fix_call_dummy.  */
  44
  45 /* Assuming that FRAME is a dummy, return a register value for the
  46    previous frame.  */
  47
  48 extern void dummy_frame_register_unwind (struct frame_info *frame,
  49                                          void **unwind_cache,
  50                                          int regnum,
  51                                          int *optimized,
  52                                          enum lval_type *lvalp,
  53                                          CORE_ADDR *addrp,
  54                                          int *realnump,
  55                                          void *valuep);
  56
  57 /* Assuming that FRAME is a dummy, return the resume address for the
  58    previous frame.  */
  59
  60 extern CORE_ADDR dummy_frame_pc_unwind (struct frame_info *frame,
  61                                         void **unwind_cache);
  62
  63 /* Return the regcache that belongs to the dummy-frame identifed by PC
  64    and FP, or NULL if no such frame exists.  */
  65 /* FIXME: cagney/2002-11-08: The function only exists because of
  66    deprecated_generic_get_saved_register.  Eliminate that function and
  67    this, to, can go.  */
  68
  69 extern struct regcache *generic_find_dummy_frame (CORE_ADDR pc,
  70                                                   CORE_ADDR fp);
  71 #endif /* !defined (DUMMY_FRAME_H)  */