gdb/target-descriptions.h

   1 /* Target description support for GDB.
   2
   3    Copyright (C) 2006-2019 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 #include "common/tdesc.h"
  25
  26 struct tdesc_arch_data;
  27 struct target_ops;
  28 /* An inferior's target description info is stored in this opaque
  29    object.  There's one such object per inferior.  */
  30 struct target_desc_info;
  31 struct inferior;
  32
  33 /* Fetch the current inferior's description, and switch its current
  34    architecture to one which incorporates that description.  */
  35
  36 void target_find_description (void);
  37
  38 /* Discard any description fetched from the target for the current
  39    inferior, and switch the current architecture to one with no target
  40    description.  */
  41
  42 void target_clear_description (void);
  43
  44 /* Return the current inferior's target description.  This should only
  45    be used by gdbarch initialization code; most access should be
  46    through an existing gdbarch.  */
  47
  48 const struct target_desc *target_current_description (void);
  49
  50 /* Copy inferior target description data.  Used for example when
  51    handling (v)forks, where child's description is the same as the
  52    parent's, since the child really is a copy of the parent.  */
  53
  54 void copy_inferior_target_desc_info (struct inferior *destinf,
  55                                      struct inferior *srcinf);
  56
  57 /* Free a target_desc_info object.  */
  58
  59 void target_desc_info_free (struct target_desc_info *tdesc_info);
  60
  61 /* Returns true if INFO indicates the target description had been
  62    supplied by the user.  */
  63
  64 int target_desc_info_from_user_p (struct target_desc_info *info);
  65
  66 /* Record architecture-specific functions to call for pseudo-register
  67    support.  If tdesc_use_registers is called and gdbarch_num_pseudo_regs
  68    is greater than zero, then these should be called as well.
  69    They are equivalent to the gdbarch methods with similar names,
  70    except that they will only be called for pseudo registers.  */
  71
  72 void set_tdesc_pseudo_register_name
  73   (struct gdbarch *gdbarch, gdbarch_register_name_ftype *pseudo_name);
  74
  75 void set_tdesc_pseudo_register_type
  76   (struct gdbarch *gdbarch, gdbarch_register_type_ftype *pseudo_type);
  77
  78 void set_tdesc_pseudo_register_reggroup_p
  79   (struct gdbarch *gdbarch,
  80    gdbarch_register_reggroup_p_ftype *pseudo_reggroup_p);
  81
  82 /* Update GDBARCH to use the TARGET_DESC for registers.  TARGET_DESC
  83    may be GDBARCH's target description or (if GDBARCH does not have
  84    one which describes registers) another target description
  85    constructed by the gdbarch initialization routine.
  86
  87    Fixed register assignments are taken from EARLY_DATA, which is freed.
  88    All registers which have not been assigned fixed numbers are given
  89    numbers above the current value of gdbarch_num_regs.
  90    gdbarch_num_regs and various  register-related predicates are updated to
  91    refer to the target description.  This function should only be called from
  92    the architecture's gdbarch initialization routine, and only after
  93    successfully validating the required registers.  */
  94
  95 void tdesc_use_registers (struct gdbarch *gdbarch,
  96                           const struct target_desc *target_desc,
  97                           struct tdesc_arch_data *early_data);
  98
  99 /* Allocate initial data for validation of a target description during
 100    gdbarch initialization.  */
 101
 102 struct tdesc_arch_data *tdesc_data_alloc (void);
 103
 104 /* Clean up data allocated by tdesc_data_alloc.  This should only
 105    be called to discard the data; tdesc_use_registers takes ownership
 106    of its EARLY_DATA argument.  */
 107
 108 void tdesc_data_cleanup (void *data_untyped);
 109
 110 /* Search FEATURE for a register named NAME.  Record REGNO and the
 111    register in DATA; when tdesc_use_registers is called, REGNO will be
 112    assigned to the register.  1 is returned if the register was found,
 113    0 if it was not.  */
 114
 115 int tdesc_numbered_register (const struct tdesc_feature *feature,
 116                              struct tdesc_arch_data *data,
 117                              int regno, const char *name);
 118
 119 /* Search FEATURE for a register named NAME, but do not assign a fixed
 120    register number to it.  */
 121
 122 int tdesc_unnumbered_register (const struct tdesc_feature *feature,
 123                                const char *name);
 124
 125 /* Search FEATURE for a register named NAME, and return its size in
 126    bits.  The register must exist.  */
 127
 128 int tdesc_register_bitsize (const struct tdesc_feature *feature,
 129                             const char *name);
 130
 131 /* Search FEATURE for a register with any of the names from NAMES
 132    (NULL-terminated).  Record REGNO and the register in DATA; when
 133    tdesc_use_registers is called, REGNO will be assigned to the
 134    register.  1 is returned if the register was found, 0 if it was
 135    not.  */
 136
 137 int tdesc_numbered_register_choices (const struct tdesc_feature *feature,
 138                                      struct tdesc_arch_data *data,
 139                                      int regno, const char *const names[]);
 140
 141
 142 /* Accessors for target descriptions.  */
 143
 144 /* Return the BFD architecture associated with this target
 145    description, or NULL if no architecture was specified.  */
 146
 147 const struct bfd_arch_info *tdesc_architecture
 148   (const struct target_desc *);
 149
 150 /* Return the OSABI associated with this target description, or
 151    GDB_OSABI_UNKNOWN if no osabi was specified.  */
 152
 153 enum gdb_osabi tdesc_osabi (const struct target_desc *);
 154
 155 /* Return non-zero if this target description is compatible
 156    with the given BFD architecture.  */
 157
 158 int tdesc_compatible_p (const struct target_desc *,
 159                         const struct bfd_arch_info *);
 160
 161 /* Return the string value of a property named KEY, or NULL if the
 162    property was not specified.  */
 163
 164 const char *tdesc_property (const struct target_desc *,
 165                             const char *key);
 166
 167 /* Return 1 if this target description describes any registers.  */
 168
 169 int tdesc_has_registers (const struct target_desc *);
 170
 171 /* Return the feature with the given name, if present, or NULL if
 172    the named feature is not found.  */
 173
 174 const struct tdesc_feature *tdesc_find_feature (const struct target_desc *,
 175                                                 const char *name);
 176
 177 /* Return the name of FEATURE.  */
 178
 179 const char *tdesc_feature_name (const struct tdesc_feature *feature);
 180
 181 /* Return the name of register REGNO, from the target description or
 182    from an architecture-provided pseudo_register_name method.  */
 183
 184 const char *tdesc_register_name (struct gdbarch *gdbarch, int regno);
 185
 186 /* Return the type of register REGNO, from the target description or
 187    from an architecture-provided pseudo_register_type method.  */
 188
 189 struct type *tdesc_register_type (struct gdbarch *gdbarch, int regno);
 190
 191 /* Return the type associated with ID, from the target description.  */
 192
 193 struct type *tdesc_find_type (struct gdbarch *gdbarch, const char *id);
 194
 195 /* Check whether REGNUM is a member of REGGROUP using the target
 196    description.  Return -1 if the target description does not
 197    specify a group.  */
 198
 199 int tdesc_register_in_reggroup_p (struct gdbarch *gdbarch, int regno,
 200                                   struct reggroup *reggroup);
 201
 202
 203 /* A deleter adapter for a target desc.  */
 204
 205 struct target_desc_deleter
 206 {
 207   void operator() (struct target_desc *desc) const;
 208 };
 209
 210 /* A unique pointer specialization that holds a target_desc.  */
 211
 212 typedef std::unique_ptr<target_desc, target_desc_deleter> target_desc_up;
 213
 214 /* Methods for constructing a target description.  */
 215
 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 #if GDB_SELF_TEST
 225 namespace selftests {
 226
 227 /* Record that XML_FILE should generate a target description that equals
 228    TDESC, to be verified by the "maintenance check xml-descriptions"
 229    command.  This function takes ownership of TDESC.  */
 230
 231 void record_xml_tdesc (const char *xml_file,
 232                        const struct target_desc *tdesc);
 233 }
 234 #endif
 235
 236 #endif /* TARGET_DESCRIPTIONS_H */