gdb/builtin-regs.c

   1 /* Builtin registers, for GDB, the GNU debugger.
   2
   3    Copyright 2002 Free Software Foundation, Inc.
   4
   5    Contributed by Red Hat.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #include "defs.h"
  25 #include "builtin-regs.h"
  26 #include "gdbtypes.h"
  27 #include "gdb_string.h"
  28 #include "gdb_assert.h"
  29
  30 /* Implement builtin register types.  Builtin registers have regnum's
  31    that live above of the range [0 .. NUM_REGS + NUM_PSEUDO_REGS)
  32    (which is controlled by the target).  The target should never see a
  33    builtin register's regnum value.  */
  34
  35 /* An array of builtin registers.  Always append, never delete.  By
  36    doing this, the relative regnum (offset from NUM_REGS +
  37    NUM_PSEUDO_REGS) assigned to each builtin register never changes.  */
  38
  39 struct builtin_reg
  40 {
  41   const char *name;
  42   struct value *(*value) (struct frame_info * frame);
  43 };
  44
  45 static struct builtin_reg *builtin_regs;
  46 int nr_builtin_regs;
  47
  48 void
  49 add_builtin_reg (const char *name, struct value *(*value) (struct frame_info * frame))
  50 {
  51   nr_builtin_regs++;
  52   builtin_regs = xrealloc (builtin_regs,
  53                            nr_builtin_regs * sizeof (builtin_regs[0]));
  54   builtin_regs[nr_builtin_regs - 1].name = name;
  55   builtin_regs[nr_builtin_regs - 1].value = value;
  56 }
  57
  58 int
  59 builtin_reg_map_name_to_regnum (const char *name, int len)
  60 {
  61   int reg;
  62   for (reg = 0; reg < nr_builtin_regs; reg++)
  63     {
  64       if (len == strlen (builtin_regs[reg].name)
  65           && strncmp (builtin_regs[reg].name, name, len) == 0)
  66         return NUM_REGS + NUM_PSEUDO_REGS + reg;
  67     }
  68   return -1;
  69 }
  70
  71 const char *
  72 builtin_reg_map_regnum_to_name (int regnum)
  73 {
  74   int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);
  75   if (reg < 0 || reg >= nr_builtin_regs)
  76     return NULL;
  77   return builtin_regs[reg].name;
  78 }
  79
  80 struct value *
  81 value_of_builtin_reg (int regnum, struct frame_info *frame)
  82 {
  83   int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);
  84   gdb_assert (reg >= 0 && reg < nr_builtin_regs);
  85   return builtin_regs[reg].value (frame);
  86 }