gdb/target-descriptions.h

   1 /* Target description support for GDB.
   2
   3    Copyright (C) 2006, 2007, 2008 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_reg;
  28 struct target_desc;
  29 struct target_ops;
  30 struct type;
  31
  32 /* Fetch the current target's description, and switch the current
  33    architecture to one which incorporates that description.  */
  34
  35 void target_find_description (void);
  36
  37 /* Discard any description fetched from the current target, and switch
  38    the current architecture to one with no target description.  */
  39
  40 void target_clear_description (void);
  41
  42 /* Return the global current target description.  This should only be
  43    used by gdbarch initialization code; most access should be through
  44    an existing gdbarch.  */
  45
  46 const struct target_desc *target_current_description (void);
  47
  48 /* Record architecture-specific functions to call for pseudo-register
  49    support.  If tdesc_use_registers is called and gdbarch_num_pseudo_regs
  50    is greater than zero, then these should be called as well.
  51    They are equivalent to the gdbarch methods with similar names,
  52    except that they will only be called for pseudo registers.  */
  53
  54 void set_tdesc_pseudo_register_name
  55   (struct gdbarch *gdbarch, gdbarch_register_name_ftype *pseudo_name);
  56
  57 void set_tdesc_pseudo_register_type
  58   (struct gdbarch *gdbarch, gdbarch_register_type_ftype *pseudo_type);
  59
  60 void set_tdesc_pseudo_register_reggroup_p
  61   (struct gdbarch *gdbarch,
  62    gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p);
  63
  64 /* Update GDBARCH to use the TARGET_DESC for registers.  TARGET_DESC
  65    may be GDBARCH's target description or (if GDBARCH does not have
  66    one which describes registers) another target description
  67    constructed by the gdbarch initialization routine.
  68
  69    Fixed register assignments are taken from EARLY_DATA, which is freed.
  70    All registers which have not been assigned fixed numbers are given
  71    numbers above the current value of gdbarch_num_regs.
  72    gdbarch_num_regs and various  register-related predicates are updated to
  73    refer to the target description.  This function should only be called from
  74    the architecture's gdbarch initialization routine, and only after
  75    successfully validating the required registers.  */
  76
  77 void tdesc_use_registers (struct gdbarch *gdbarch,
  78                           const struct target_desc *target_desc,
  79                           struct tdesc_arch_data *early_data);
  80
  81 /* Allocate initial data for validation of a target description during
  82    gdbarch initialization.  */
  83
  84 struct tdesc_arch_data *tdesc_data_alloc (void);
  85
  86 /* Clean up data allocated by tdesc_data_alloc.  This should only
  87    be called to discard the data; tdesc_use_registers takes ownership
  88    of its EARLY_DATA argument.  */
  89
  90 void tdesc_data_cleanup (void *data_untyped);
  91
  92 /* Search FEATURE for a register named NAME.  Record REGNO and the
  93    register in DATA; when tdesc_use_registers is called, REGNO will be
  94    assigned to the register.  1 is returned if the register was found,
  95    0 if it was not.  */
  96
  97 int tdesc_numbered_register (const struct tdesc_feature *feature,
  98                              struct tdesc_arch_data *data,
  99                              int regno, const char *name);
 100
 101 /* Search FEATURE for a register named NAME, and return its size in
 102    bits.  The register must exist.  */
 103
 104 int tdesc_register_size (const struct tdesc_feature *feature,
 105                          const char *name);
 106
 107 /* Search FEATURE for a register with any of the names from NAMES
 108    (NULL-terminated).  Record REGNO and the register in DATA; when
 109    tdesc_use_registers is called, REGNO will be assigned to the
 110    register.  1 is returned if the register was found, 0 if it was
 111    not.  */
 112
 113 int tdesc_numbered_register_choices (const struct tdesc_feature *feature,
 114                                      struct tdesc_arch_data *data,
 115                                      int regno, const char *const names[]);
 116
 117
 118 /* Accessors for target descriptions.  */
 119
 120 /* Return the BFD architecture associated with this target
 121    description, or NULL if no architecture was specified.  */
 122
 123 const struct bfd_arch_info *tdesc_architecture
 124   (const struct target_desc *);
 125
 126 /* Return the string value of a property named KEY, or NULL if the
 127    property was not specified.  */
 128
 129 const char *tdesc_property (const struct target_desc *,
 130                             const char *key);
 131
 132 /* Return 1 if this target description describes any registers.  */
 133
 134 int tdesc_has_registers (const struct target_desc *);
 135
 136 /* Return the feature with the given name, if present, or NULL if
 137    the named feature is not found.  */
 138
 139 const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
 140                                                 const char *name);
 141
 142 /* Return the name of FEATURE.  */
 143
 144 const char *tdesc_feature_name (const struct tdesc_feature *feature);
 145
 146 /* Return the type associated with ID in the context of FEATURE, or
 147    NULL if none.  */
 148
 149 struct type *tdesc_named_type (const struct tdesc_feature *feature,
 150                                const char *id);
 151
 152 /* Return the name of register REGNO, from the target description or
 153    from an architecture-provided pseudo_register_name method.  */
 154
 155 const char *tdesc_register_name (struct gdbarch *gdbarch, int regno);
 156
 157 /* Check whether REGNUM is a member of REGGROUP using the target
 158    description.  Return -1 if the target description does not
 159    specify a group.  */
 160
 161 int tdesc_register_in_reggroup_p (struct gdbarch *gdbarch, int regno,
 162                                   struct reggroup *reggroup);
 163
 164 /* Methods for constructing a target description.  */
 165
 166 struct target_desc *allocate_target_description (void);
 167 struct cleanup *make_cleanup_free_target_description (struct target_desc *);
 168 void set_tdesc_architecture (struct target_desc *,
 169                              const struct bfd_arch_info *);
 170 void set_tdesc_property (struct target_desc *,
 171                          const char *key, const char *value);
 172
 173 struct tdesc_feature *tdesc_create_feature (struct target_desc *tdesc,
 174                                             const char *name);
 175 void tdesc_record_type (struct tdesc_feature *feature, struct type *type);
 176
 177 void tdesc_create_reg (struct tdesc_feature *feature, const char *name,
 178                        int regnum, int save_restore, const char *group,
 179                        int bitsize, const char *type);
 180
 181 #endif /* TARGET_DESCRIPTIONS_H */