gdb/target-descriptions.h

   1 /* Target description support for GDB.
   2
   3    Copyright (C) 2006, 2007 Free Software Foundation, Inc.
   4
   5    Contributed by CodeSourcery.
   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., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.  */
  23
  24 #ifndef TARGET_DESCRIPTIONS_H
  25 #define TARGET_DESCRIPTIONS_H 1
  26
  27 struct tdesc_feature;
  28 struct tdesc_arch_data;
  29 struct tdesc_reg;
  30 struct target_desc;
  31 struct target_ops;
  32 struct type;
  33
  34 /* Fetch the current target's description, and switch the current
  35    architecture to one which incorporates that description.  */
  36
  37 void target_find_description (void);
  38
  39 /* Discard any description fetched from the current target, and switch
  40    the current architecture to one with no target description.  */
  41
  42 void target_clear_description (void);
  43
  44 /* Return the global current target description.  This should only be
  45    used by gdbarch initialization code; most access should be through
  46    an existing gdbarch.  */
  47
  48 const struct target_desc *target_current_description (void);
  49
  50 /* Record architecture-specific functions to call for pseudo-register
  51    support.  If tdesc_use_registers is called and gdbarch_num_pseudo_regs
  52    is greater than zero, then these should be called as well.
  53    They are equivalent to the gdbarch methods with similar names,
  54    except that they will only be called for pseudo registers.  */
  55
  56 void set_tdesc_pseudo_register_name
  57   (struct gdbarch *gdbarch, gdbarch_register_name_ftype *pseudo_name);
  58
  59 void set_tdesc_pseudo_register_type
  60   (struct gdbarch *gdbarch, gdbarch_register_type_ftype *pseudo_type);
  61
  62 void set_tdesc_pseudo_register_reggroup_p
  63   (struct gdbarch *gdbarch,
  64    gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p);
  65
  66 /* Update GDBARCH to use the target description for registers.  Fixed
  67    register assignments are taken from EARLY_DATA, which is freed.
  68    All registers which have not been assigned fixed numbers are given
  69    numbers above the current value of gdbarch_num_regs.
  70    gdbarch_num_regs and various  register-related predicates are updated to
  71    refer to the target description.  This function should only be called from
  72    the architecture's gdbarch initialization routine, and only after
  73    successfully validating the required registers.  */
  74
  75 void tdesc_use_registers (struct gdbarch *gdbarch,
  76                           struct tdesc_arch_data *early_data);
  77
  78 /* Allocate initial data for validation of a target description during
  79    gdbarch initialization.  */
  80
  81 struct tdesc_arch_data *tdesc_data_alloc (void);
  82
  83 /* Clean up data allocated by tdesc_data_alloc.  This should only
  84    be called to discard the data; tdesc_use_registers takes ownership
  85    of its EARLY_DATA argument.  */
  86
  87 void tdesc_data_cleanup (void *data_untyped);
  88
  89 /* Search FEATURE for a register named NAME.  Record REGNO and the
  90    register in DATA; when tdesc_use_registers is called, REGNO will be
  91    assigned to the register.  1 is returned if the register was found,
  92    0 if it was not.  */
  93
  94 int tdesc_numbered_register (const struct tdesc_feature *feature,
  95                              struct tdesc_arch_data *data,
  96                              int regno, const char *name);
  97
  98 /* Search FEATURE for a register with any of the names from NAMES
  99    (NULL-terminated).  Record REGNO and the register in DATA; when
 100    tdesc_use_registers is called, REGNO will be assigned to the
 101    register.  1 is returned if the register was found, 0 if it was
 102    not.  */
 103
 104 int tdesc_numbered_register_choices (const struct tdesc_feature *feature,
 105                                      struct tdesc_arch_data *data,
 106                                      int regno, const char *const names[]);
 107
 108
 109 /* Accessors for target descriptions.  */
 110
 111 /* Return the BFD architecture associated with this target
 112    description, or NULL if no architecture was specified.  */
 113
 114 const struct bfd_arch_info *tdesc_architecture
 115   (const struct target_desc *);
 116
 117 /* Return the string value of a property named KEY, or NULL if the
 118    property was not specified.  */
 119
 120 const char *tdesc_property (const struct target_desc *,
 121                             const char *key);
 122
 123 /* Return 1 if this target description describes any registers.  */
 124
 125 int tdesc_has_registers (const struct target_desc *);
 126
 127 /* Return the feature with the given name, if present, or NULL if
 128    the named feature is not found.  */
 129
 130 const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
 131                                                 const char *name);
 132
 133 /* Return the name of FEATURE.  */
 134
 135 const char *tdesc_feature_name (const struct tdesc_feature *feature);
 136
 137 /* Return the type associated with ID in the context of FEATURE, or
 138    NULL if none.  */
 139
 140 struct type *tdesc_named_type (const struct tdesc_feature *feature,
 141                                const char *id);
 142
 143 /* Methods for constructing a target description.  */
 144
 145 struct target_desc *allocate_target_description (void);
 146 struct cleanup *make_cleanup_free_target_description (struct target_desc *);
 147 void set_tdesc_architecture (struct target_desc *,
 148                              const struct bfd_arch_info *);
 149 void set_tdesc_property (struct target_desc *,
 150                          const char *key, const char *value);
 151
 152 struct tdesc_feature *tdesc_create_feature (struct target_desc *tdesc,
 153                                             const char *name);
 154 void tdesc_record_type (struct tdesc_feature *feature, struct type *type);
 155
 156 void tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 157                        int regnum, int save_restore, const char *group,
 158                        int bitsize, const char *type);
 159
 160 #endif /* TARGET_DESCRIPTIONS_H */