gdb/target-descriptions.h

   1 /* Target description support for GDB.
   2
   3    Copyright (C) 2006-2013 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 3 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, see <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef TARGET_DESCRIPTIONS_H
  23 #define TARGET_DESCRIPTIONS_H 1
  24
  25 struct tdesc_feature;
  26 struct tdesc_arch_data;
  27 struct tdesc_type;
  28 struct tdesc_reg;
  29 struct target_desc;
  30 struct target_ops;
  31 struct target_desc;
  32 /* An inferior's target description info is stored in this opaque
  33    object.  There's one such object per inferior.  */
  34 struct target_desc_info;
  35 struct inferior;
  36
  37 /* Fetch the current inferior's description, and switch its current
  38    architecture to one which incorporates that description.  */
  39
  40 void target_find_description (void);
  41
  42 /* Discard any description fetched from the target for the current
  43    inferior, and switch the current architecture to one with no target
  44    description.  */
  45
  46 void target_clear_description (void);
  47
  48 /* Return the current inferior's target description.  This should only
  49    be used by gdbarch initialization code; most access should be
  50    through an existing gdbarch.  */
  51
  52 const struct target_desc *target_current_description (void);
  53
  54 /* Copy inferior target description data.  Used for example when
  55    handling (v)forks, where child's description is the same as the
  56    parent's, since the child really is a copy of the parent.  */
  57
  58 void copy_inferior_target_desc_info (struct inferior *destinf,
  59                                      struct inferior *srcinf);
  60
  61 /* Free a target_desc_info object.  */
  62
  63 void target_desc_info_free (struct target_desc_info *tdesc_info);
  64
  65 /* Returns true if INFO indicates the target description had been
  66    supplied by the user.  */
  67
  68 int target_desc_info_from_user_p (struct target_desc_info *info);
  69
  70 /* Record architecture-specific functions to call for pseudo-register
  71    support.  If tdesc_use_registers is called and gdbarch_num_pseudo_regs
  72    is greater than zero, then these should be called as well.
  73    They are equivalent to the gdbarch methods with similar names,
  74    except that they will only be called for pseudo registers.  */
  75
  76 void set_tdesc_pseudo_register_name
  77   (struct gdbarch *gdbarch, gdbarch_register_name_ftype *pseudo_name);
  78
  79 void set_tdesc_pseudo_register_type
  80   (struct gdbarch *gdbarch, gdbarch_register_type_ftype *pseudo_type);
  81
  82 void set_tdesc_pseudo_register_reggroup_p
  83   (struct gdbarch *gdbarch,
  84    gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p);
  85
  86 /* Update GDBARCH to use the TARGET_DESC for registers.  TARGET_DESC
  87    may be GDBARCH's target description or (if GDBARCH does not have
  88    one which describes registers) another target description
  89    constructed by the gdbarch initialization routine.
  90
  91    Fixed register assignments are taken from EARLY_DATA, which is freed.
  92    All registers which have not been assigned fixed numbers are given
  93    numbers above the current value of gdbarch_num_regs.
  94    gdbarch_num_regs and various  register-related predicates are updated to
  95    refer to the target description.  This function should only be called from
  96    the architecture's gdbarch initialization routine, and only after
  97    successfully validating the required registers.  */
  98
  99 void tdesc_use_registers (struct gdbarch *gdbarch,
 100                           const struct target_desc *target_desc,
 101                           struct tdesc_arch_data *early_data);
 102
 103 /* Allocate initial data for validation of a target description during
 104    gdbarch initialization.  */
 105
 106 struct tdesc_arch_data *tdesc_data_alloc (void);
 107
 108 /* Clean up data allocated by tdesc_data_alloc.  This should only
 109    be called to discard the data; tdesc_use_registers takes ownership
 110    of its EARLY_DATA argument.  */
 111
 112 void tdesc_data_cleanup (void *data_untyped);
 113
 114 /* Search FEATURE for a register named NAME.  Record REGNO and the
 115    register in DATA; when tdesc_use_registers is called, REGNO will be
 116    assigned to the register.  1 is returned if the register was found,
 117    0 if it was not.  */
 118
 119 int tdesc_numbered_register (const struct tdesc_feature *feature,
 120                              struct tdesc_arch_data *data,
 121                              int regno, const char *name);
 122
 123 /* Search FEATURE for a register named NAME, but do not assign a fixed
 124    register number to it.  */
 125
 126 int tdesc_unnumbered_register (const struct tdesc_feature *feature,
 127                                const char *name);
 128
 129 /* Search FEATURE for a register named NAME, and return its size in
 130    bits.  The register must exist.  */
 131
 132 int tdesc_register_size (const struct tdesc_feature *feature,
 133                          const char *name);
 134
 135 /* Search FEATURE for a register with any of the names from NAMES
 136    (NULL-terminated).  Record REGNO and the register in DATA; when
 137    tdesc_use_registers is called, REGNO will be assigned to the
 138    register.  1 is returned if the register was found, 0 if it was
 139    not.  */
 140
 141 int tdesc_numbered_register_choices (const struct tdesc_feature *feature,
 142                                      struct tdesc_arch_data *data,
 143                                      int regno, const char *const names[]);
 144
 145
 146 /* Accessors for target descriptions.  */
 147
 148 /* Return the BFD architecture associated with this target
 149    description, or NULL if no architecture was specified.  */
 150
 151 const struct bfd_arch_info *tdesc_architecture
 152   (const struct target_desc *);
 153
 154 /* Return the OSABI associated with this target description, or
 155    GDB_OSABI_UNKNOWN if no osabi was specified.  */
 156
 157 enum gdb_osabi tdesc_osabi (const struct target_desc *);
 158
 159 /* Return non-zero if this target description is compatible
 160    with the given BFD architecture.  */
 161
 162 int tdesc_compatible_p (const struct target_desc *,
 163                         const struct bfd_arch_info *);
 164
 165 /* Return the string value of a property named KEY, or NULL if the
 166    property was not specified.  */
 167
 168 const char *tdesc_property (const struct target_desc *,
 169                             const char *key);
 170
 171 /* Return 1 if this target description describes any registers.  */
 172
 173 int tdesc_has_registers (const struct target_desc *);
 174
 175 /* Return the feature with the given name, if present, or NULL if
 176    the named feature is not found.  */
 177
 178 const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
 179                                                 const char *name);
 180
 181 /* Return the name of FEATURE.  */
 182
 183 const char *tdesc_feature_name (const struct tdesc_feature *feature);
 184
 185 /* Return the type associated with ID in the context of FEATURE, or
 186    NULL if none.  */
 187
 188 struct tdesc_type *tdesc_named_type (const struct tdesc_feature *feature,
 189                                      const char *id);
 190
 191 /* Return the name of register REGNO, from the target description or
 192    from an architecture-provided pseudo_register_name method.  */
 193
 194 const char *tdesc_register_name (struct gdbarch *gdbarch, int regno);
 195
 196 /* Return the type of register REGNO, from the target description or
 197    from an architecture-provided pseudo_register_type method.  */
 198
 199 struct type *tdesc_register_type (struct gdbarch *gdbarch, int regno);
 200
 201 /* Return the type associated with ID, from the target description.  */
 202
 203 struct type *tdesc_find_type (struct gdbarch *gdbarch, const char *id);
 204
 205 /* Check whether REGNUM is a member of REGGROUP using the target
 206    description.  Return -1 if the target description does not
 207    specify a group.  */
 208
 209 int tdesc_register_in_reggroup_p (struct gdbarch *gdbarch, int regno,
 210                                   struct reggroup *reggroup);
 211
 212 /* Methods for constructing a target description.  */
 213
 214 struct target_desc *allocate_target_description (void);
 215 struct cleanup *make_cleanup_free_target_description (struct target_desc *);
 216 void set_tdesc_architecture (struct target_desc *,
 217                              const struct bfd_arch_info *);
 218 void set_tdesc_osabi (struct target_desc *, enum gdb_osabi osabi);
 219 void set_tdesc_property (struct target_desc *,
 220                          const char *key, const char *value);
 221 void tdesc_add_compatible (struct target_desc *,
 222                            const struct bfd_arch_info *);
 223
 224 struct tdesc_feature *tdesc_create_feature (struct target_desc *tdesc,
 225                                             const char *name);
 226 struct tdesc_type *tdesc_create_vector (struct tdesc_feature *feature,
 227                                         const char *name,
 228                                         struct tdesc_type *field_type,
 229                                         int count);
 230 struct tdesc_type *tdesc_create_struct (struct tdesc_feature *feature,
 231                                         const char *name);
 232 void tdesc_set_struct_size (struct tdesc_type *type, LONGEST size);
 233 struct tdesc_type *tdesc_create_union (struct tdesc_feature *feature,
 234                                        const char *name);
 235 struct tdesc_type *tdesc_create_flags (struct tdesc_feature *feature,
 236                                        const char *name,
 237                                        LONGEST size);
 238 void tdesc_add_field (struct tdesc_type *type, const char *field_name,
 239                       struct tdesc_type *field_type);
 240 void tdesc_add_bitfield (struct tdesc_type *type, const char *field_name,
 241                          int start, int end);
 242 void tdesc_add_flag (struct tdesc_type *type, int start,
 243                      const char *flag_name);
 244 void tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 245                        int regnum, int save_restore, const char *group,
 246                        int bitsize, const char *type);
 247
 248 #endif /* TARGET_DESCRIPTIONS_H */