gdb/regcache.h

   1 /* Cache and manage the values of registers for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986-2014 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef REGCACHE_H
  21 #define REGCACHE_H
  22
  23 struct regcache;
  24 struct gdbarch;
  25 struct address_space;
  26
  27 extern struct regcache *get_current_regcache (void);
  28 extern struct regcache *get_thread_regcache (ptid_t ptid);
  29 extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
  30 extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
  31                                                          struct gdbarch *,
  32                                                          struct address_space *);
  33
  34 void regcache_xfree (struct regcache *regcache);
  35 struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
  36 struct regcache *regcache_xmalloc (struct gdbarch *gdbarch,
  37                                    struct address_space *aspace);
  38
  39 /* Return REGCACHE's architecture.  */
  40
  41 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
  42
  43 /* Return REGCACHE's address space.  */
  44
  45 extern struct address_space *get_regcache_aspace (const struct regcache *);
  46
  47 enum register_status
  48   {
  49     /* The register value is not in the cache, and we don't know yet
  50        whether it's available in the target (or traceframe).  */
  51     REG_UNKNOWN = 0,
  52
  53     /* The register value is valid and cached.  */
  54     REG_VALID = 1,
  55
  56     /* The register value is unavailable.  E.g., we're inspecting a
  57        traceframe, and this register wasn't collected.  Note that this
  58        is different a different "unavailable" from saying the register
  59        does not exist in the target's architecture --- in that case,
  60        the target should have given us a target description that does
  61        not include the register in the first place.  */
  62     REG_UNAVAILABLE = -1
  63   };
  64
  65 enum register_status regcache_register_status (const struct regcache *regcache,
  66                                                int regnum);
  67
  68 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
  69    regcache.  The read variants return the status of the register.  */
  70
  71 enum register_status regcache_raw_read (struct regcache *regcache,
  72                                         int rawnum, gdb_byte *buf);
  73 void regcache_raw_write (struct regcache *regcache, int rawnum,
  74                          const gdb_byte *buf);
  75 extern enum register_status
  76   regcache_raw_read_signed (struct regcache *regcache,
  77                             int regnum, LONGEST *val);
  78 extern enum register_status
  79   regcache_raw_read_unsigned (struct regcache *regcache,
  80                               int regnum, ULONGEST *val);
  81 extern void regcache_raw_write_signed (struct regcache *regcache,
  82                                        int regnum, LONGEST val);
  83 extern void regcache_raw_write_unsigned (struct regcache *regcache,
  84                                          int regnum, ULONGEST val);
  85
  86 /* Partial transfer of raw registers.  These perform read, modify,
  87    write style operations.  The read variant returns the status of the
  88    register.  */
  89
  90 extern enum register_status
  91   regcache_raw_read_part (struct regcache *regcache, int regnum,
  92                           int offset, int len, gdb_byte *buf);
  93 void regcache_raw_write_part (struct regcache *regcache, int regnum,
  94                               int offset, int len, const gdb_byte *buf);
  95
  96 void regcache_invalidate (struct regcache *regcache, int regnum);
  97
  98 /* Transfer of pseudo-registers.  The read variants return a register
  99    status, as an indication of when a ``cooked'' register was
 100    constructed from valid, invalid or unavailable ``raw''
 101    registers.  */
 102
 103 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */
 104 enum register_status regcache_cooked_read (struct regcache *regcache,
 105                                            int rawnum, gdb_byte *buf);
 106 void regcache_cooked_write (struct regcache *regcache, int rawnum,
 107                             const gdb_byte *buf);
 108
 109 /* Read register REGNUM from REGCACHE and return a new value.  This
 110    will call mark_value_bytes_unavailable as appropriate.  */
 111
 112 struct value *regcache_cooked_read_value (struct regcache *regcache,
 113                                           int regnum);
 114
 115 /* Read a register as a signed/unsigned quantity.  */
 116 extern enum register_status
 117   regcache_cooked_read_signed (struct regcache *regcache,
 118                                int regnum, LONGEST *val);
 119 extern enum register_status
 120   regcache_cooked_read_unsigned (struct regcache *regcache,
 121                                  int regnum, ULONGEST *val);
 122 extern void regcache_cooked_write_signed (struct regcache *regcache,
 123                                           int regnum, LONGEST val);
 124 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
 125                                             int regnum, ULONGEST val);
 126
 127 /* Partial transfer of a cooked register.  These perform read, modify,
 128    write style operations.  */
 129
 130 enum register_status regcache_cooked_read_part (struct regcache *regcache,
 131                                                 int regnum, int offset,
 132                                                 int len, gdb_byte *buf);
 133 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
 134                                  int offset, int len, const gdb_byte *buf);
 135
 136 /* Special routines to read/write the PC.  */
 137
 138 extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
 139 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
 140
 141 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
 142    target.  These functions are called by the target in response to a
 143    target_fetch_registers() or target_store_registers().  */
 144
 145 extern void regcache_raw_supply (struct regcache *regcache,
 146                                  int regnum, const void *buf);
 147 extern void regcache_raw_collect (const struct regcache *regcache,
 148                                   int regnum, void *buf);
 149
 150 /* Mapping between register numbers and offsets in a buffer, for use
 151    in the '*regset' functions below.  In an array of
 152    'regcache_map_entry' each element is interpreted like follows:
 153
 154    - If 'regno' is a register number: Map register 'regno' to the
 155      current offset (starting with 0) and increase the current offset
 156      by 'size' (or the register's size, if 'size' is zero).  Repeat
 157      this with consecutive register numbers up to 'regno+count-1'.
 158
 159    - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
 160      offset.
 161
 162    - If count=0: End of the map.  */
 163
 164 struct regcache_map_entry
 165 {
 166   int count;
 167   int regno;
 168   int size;
 169 };
 170
 171 /* Special value for the 'regno' field in the struct above.  */
 172
 173 enum
 174   {
 175     REGCACHE_MAP_SKIP = -1,
 176   };
 177
 178 /* Transfer a set of registers (as described by REGSET) between
 179    REGCACHE and BUF.  If REGNUM == -1, transfer all registers
 180    belonging to the regset, otherwise just the register numbered
 181    REGNUM.  The REGSET's 'regmap' field must point to an array of
 182    'struct regcache_map_entry'.
 183
 184    These functions are suitable for the 'regset_supply' and
 185    'regset_collect' fields in a regset structure.  */
 186
 187 extern void regcache_supply_regset (const struct regset *regset,
 188                                     struct regcache *regcache,
 189                                     int regnum, const void *buf,
 190                                     size_t size);
 191 extern void regcache_collect_regset (const struct regset *regset,
 192                                      const struct regcache *regcache,
 193                                      int regnum, void *buf, size_t size);
 194
 195
 196 /* The type of a register.  This function is slightly more efficient
 197    then its gdbarch vector counterpart since it returns a precomputed
 198    value stored in a table.  */
 199
 200 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
 201
 202
 203 /* Return the size of register REGNUM.  All registers should have only
 204    one size.  */
 205
 206 extern int register_size (struct gdbarch *gdbarch, int regnum);
 207
 208
 209 /* Save/restore a register cache.  The set of registers saved /
 210    restored into the DST regcache determined by the save_reggroup /
 211    restore_reggroup respectively.  COOKED_READ returns zero iff the
 212    register's value can't be returned.  */
 213
 214 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
 215                                                            int regnum,
 216                                                            gdb_byte *buf);
 217
 218 extern void regcache_save (struct regcache *dst,
 219                            regcache_cooked_read_ftype *cooked_read,
 220                            void *cooked_read_context);
 221
 222 /* Copy/duplicate the contents of a register cache.  By default, the
 223    operation is pass-through.  Writes to DST and reads from SRC will
 224    go through to the target.
 225
 226    The ``cpy'' functions can not have overlapping SRC and DST buffers.
 227
 228    ``no passthrough'' versions do not go through to the target.  They
 229    only transfer values already in the cache.  */
 230
 231 extern struct regcache *regcache_dup (struct regcache *regcache);
 232 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
 233 extern void regcache_cpy_no_passthrough (struct regcache *dest,
 234                                          struct regcache *src);
 235
 236 extern void registers_changed (void);
 237 extern void registers_changed_ptid (ptid_t);
 238
 239 #endif /* REGCACHE_H */