/* Builtin frame register, for GDB, the GNU debugger. Copyright 2002, 2005 Free Software Foundation, Inc. Contributed by Red Hat. 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. */ #include "defs.h" #include "user-regs.h" #include "frame.h" #include "gdbtypes.h" #include "value.h" #include "gdb_string.h" /* Types that describe the various builtin registers. */ static struct type *builtin_type_frame_reg; /* Constructors for those types. */ static void build_builtin_type_frame_reg (void) { /* $frame. */ if (builtin_type_frame_reg == NULL) { #if 0 struct frame { void *base; }; #endif builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT); append_composite_type_field (builtin_type_frame_reg, "base", builtin_type_void_data_ptr); } } static struct value * value_of_builtin_frame_reg (struct frame_info *frame) { struct value *val; char *buf; build_builtin_type_frame_reg (); val = allocate_value (builtin_type_frame_reg); VALUE_LVAL (val) = not_lval; buf = value_contents_raw (val); memset (buf, TYPE_LENGTH (value_type (val)), 0); /* frame.base. */ if (frame != NULL) ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, get_frame_base (frame)); buf += TYPE_LENGTH (builtin_type_void_data_ptr); /* frame.XXX. */ return val; } static struct value * value_of_builtin_frame_fp_reg (struct frame_info *frame) { if (DEPRECATED_FP_REGNUM >= 0) /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the register name table overrides this built-in $fp register, there is no real reason for this DEPRECATED_FP_REGNUM trickery here. An architecture wanting to implement "$fp" as alias for a raw register can do so by adding "fp" to register name table (mind you, doing this is probably a dangerous thing). */ return value_of_register (DEPRECATED_FP_REGNUM, frame); else { struct value *val = allocate_value (builtin_type_void_data_ptr); char *buf = value_contents_raw (val); if (frame == NULL) memset (buf, TYPE_LENGTH (value_type (val)), 0); else ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, get_frame_base_address (frame)); return val; } } static struct value * value_of_builtin_frame_pc_reg (struct frame_info *frame) { if (PC_REGNUM >= 0) return value_of_register (PC_REGNUM, frame); else { struct value *val = allocate_value (builtin_type_void_data_ptr); char *buf = value_contents_raw (val); if (frame == NULL) memset (buf, TYPE_LENGTH (value_type (val)), 0); else ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, get_frame_pc (frame)); return val; } } static struct value * value_of_builtin_frame_sp_reg (struct frame_info *frame) { #ifdef SP_REGNUM if (SP_REGNUM >= 0) return value_of_register (SP_REGNUM, frame); #endif error ("Standard register ``$sp'' is not available for this target"); } static struct value * value_of_builtin_frame_ps_reg (struct frame_info *frame) { #ifdef PS_REGNUM if (PS_REGNUM >= 0) return value_of_register (PS_REGNUM, frame); #endif error ("Standard register ``$ps'' is not available for this target"); } extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */ void _initialize_frame_reg (void) { /* FIXME: cagney/2002-02-08: At present the local builtin types can't be initialized using _initialize*() or gdbarch. Due mainly to non-multi-arch targets, GDB initializes things piece meal and, as a consequence can leave these types NULL. */ DEPRECATED_REGISTER_GDBARCH_SWAP (builtin_type_frame_reg); /* Frame based $fp, $pc, $sp and $ps. These only come into play when the target does not define its own version of these registers. */ user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg); user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg); user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg); user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg); /* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe / $gdb.frame disabled. It isn't yet clear which of the many options is the best. */ if (0) user_reg_add_builtin ("frame", value_of_builtin_frame_reg); }