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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [std-regs.c] - Blame information for rev 834

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1 227 jeremybenn
/* Builtin frame register, for GDB, the GNU debugger.
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   Copyright (C) 2002, 2005, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   Contributed by Red Hat.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "user-regs.h"
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#include "frame.h"
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#include "gdbtypes.h"
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#include "value.h"
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#include "gdb_string.h"
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static struct value *
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value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton)
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{
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  struct gdbarch *gdbarch = get_frame_arch (frame);
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  if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0)
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    /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
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       register name table overrides this built-in $fp register, there
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       is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
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       An architecture wanting to implement "$fp" as alias for a raw
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       register can do so by adding "fp" to register name table (mind
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       you, doing this is probably a dangerous thing).  */
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    return value_of_register (gdbarch_deprecated_fp_regnum (gdbarch),
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                              frame);
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  else
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    {
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      struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
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      struct value *val = allocate_value (data_ptr_type);
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      gdb_byte *buf = value_contents_raw (val);
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      if (frame == NULL)
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        memset (buf, 0, TYPE_LENGTH (value_type (val)));
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      else
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        gdbarch_address_to_pointer (gdbarch, data_ptr_type,
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                                    buf, get_frame_base_address (frame));
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      return val;
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    }
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}
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static struct value *
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value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton)
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{
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  struct gdbarch *gdbarch = get_frame_arch (frame);
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  if (gdbarch_pc_regnum (gdbarch) >= 0)
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    return value_of_register (gdbarch_pc_regnum (gdbarch), frame);
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  else
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    {
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      struct type *func_ptr_type = builtin_type (gdbarch)->builtin_func_ptr;
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      struct value *val = allocate_value (func_ptr_type);
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      gdb_byte *buf = value_contents_raw (val);
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      if (frame == NULL)
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        memset (buf, 0, TYPE_LENGTH (value_type (val)));
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      else
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        gdbarch_address_to_pointer (gdbarch, func_ptr_type,
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                                    buf, get_frame_pc (frame));
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      return val;
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    }
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}
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static struct value *
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value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton)
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{
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  struct gdbarch *gdbarch = get_frame_arch (frame);
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  if (gdbarch_sp_regnum (gdbarch) >= 0)
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    return value_of_register (gdbarch_sp_regnum (gdbarch), frame);
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  error (_("Standard register ``$sp'' is not available for this target"));
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}
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static struct value *
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value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
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{
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  struct gdbarch *gdbarch = get_frame_arch (frame);
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  if (gdbarch_ps_regnum (gdbarch) >= 0)
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    return value_of_register (gdbarch_ps_regnum (gdbarch), frame);
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  error (_("Standard register ``$ps'' is not available for this target"));
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}
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extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */
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void
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_initialize_frame_reg (void)
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{
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  /* Frame based $fp, $pc, $sp and $ps.  These only come into play
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     when the target does not define its own version of these
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     registers.  */
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  user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg, NULL);
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  user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg, NULL);
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  user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg, NULL);
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  user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg, NULL);
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}

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