diff options
Diffstat (limited to 'gdb/std-regs.c')
| -rw-r--r-- | gdb/std-regs.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/gdb/std-regs.c b/gdb/std-regs.c new file mode 100644 index 0000000..b96c901 --- /dev/null +++ b/gdb/std-regs.c @@ -0,0 +1,150 @@ +/* Builtin frame register, for GDB, the GNU debugger. + + Copyright 2002 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 "builtin-regs.h" +#include "frame.h" +#include "gdbtypes.h" +#include "value.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) +{ + /* $frame. */ + if (builtin_type_frame_reg == NULL) + { +#if 0 + struct frame + { + void *base; + }; +#endif + builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT); + append_composite_type_field (builtin_type_frame_reg, "base", + builtin_type_void_data_ptr); + } +} + +static struct value * +value_of_builtin_frame_reg (struct frame_info *frame) +{ + struct value *val; + char *buf; + build_builtin_type_frame_reg (); + val = allocate_value (builtin_type_frame_reg); + VALUE_LVAL (val) = not_lval; + buf = VALUE_CONTENTS_RAW (val); + memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); + /* frame.base. */ + if (frame != NULL) + ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame); + buf += TYPE_LENGTH (builtin_type_void_data_ptr); + /* frame.XXX. */ + return val; +} + +static struct value * +value_of_builtin_frame_fp_reg (struct frame_info *frame) +{ +#ifdef FP_REGNUM + if (FP_REGNUM >= 0) + return value_of_register (FP_REGNUM, frame); +#endif + { + struct value *val = allocate_value (builtin_type_void_data_ptr); + char *buf = VALUE_CONTENTS_RAW (val); + if (frame == NULL) + memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); + else + ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame); + return val; + } +} + +static struct value * +value_of_builtin_frame_pc_reg (struct frame_info *frame) +{ +#ifdef PC_REGNUM + if (PC_REGNUM >= 0) + return value_of_register (PC_REGNUM, frame); +#endif + { + struct value *val = allocate_value (builtin_type_void_data_ptr); + char *buf = VALUE_CONTENTS_RAW (val); + if (frame == NULL) + memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); + else + ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->pc); + return val; + } +} + +static struct value * +value_of_builtin_frame_sp_reg (struct frame_info *frame) +{ +#ifdef SP_REGNUM + if (SP_REGNUM >= 0) + return value_of_register (SP_REGNUM, frame); +#endif + error ("Standard register ``$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"); +} + +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. */ + 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. */ + add_builtin_reg ("fp", value_of_builtin_frame_fp_reg); + add_builtin_reg ("pc", value_of_builtin_frame_pc_reg); + add_builtin_reg ("sp", value_of_builtin_frame_sp_reg); + add_builtin_reg ("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) + add_builtin_reg ("frame", value_of_builtin_frame_reg); +} |