gdb/regcache.h

   1 /* Cache and manage the values of registers for GDB, the GNU debugger.
   2
   3    Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
   4    2001, 2002 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #ifndef REGCACHE_H
  24 #define REGCACHE_H
  25
  26 struct regcache;
  27 struct gdbarch;
  28
  29 extern struct regcache *current_regcache;
  30
  31 void regcache_xfree (struct regcache *regcache);
  32 struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
  33 struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
  34
  35 /* Return REGCACHE's architecture.  */
  36
  37 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
  38
  39 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
  40    regcache. */
  41
  42 void regcache_raw_read (struct regcache *regcache, int rawnum, gdb_byte *buf);
  43 void regcache_raw_write (struct regcache *regcache, int rawnum,
  44                          const gdb_byte *buf);
  45 extern void regcache_raw_read_signed (struct regcache *regcache,
  46                                       int regnum, LONGEST *val);
  47 extern void regcache_raw_read_unsigned (struct regcache *regcache,
  48                                         int regnum, ULONGEST *val);
  49 extern void regcache_raw_write_signed (struct regcache *regcache,
  50                                        int regnum, LONGEST val);
  51 extern void regcache_raw_write_unsigned (struct regcache *regcache,
  52                                          int regnum, ULONGEST val);
  53
  54 /* Partial transfer of a raw registers.  These perform read, modify,
  55    write style operations.  */
  56
  57 void regcache_raw_read_part (struct regcache *regcache, int regnum,
  58                              int offset, int len, gdb_byte *buf);
  59 void regcache_raw_write_part (struct regcache *regcache, int regnum,
  60                               int offset, int len, const gdb_byte *buf);
  61
  62 int regcache_valid_p (struct regcache *regcache, int regnum);
  63
  64 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */
  65 void regcache_cooked_read (struct regcache *regcache, int rawnum,
  66                            gdb_byte *buf);
  67 void regcache_cooked_write (struct regcache *regcache, int rawnum,
  68                             const gdb_byte *buf);
  69
  70 /* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
  71    for indicating when a ``cooked'' register was constructed from
  72    invalid or unavailable ``raw'' registers.  One fairly easy way of
  73    adding such a mechanism would be for the cooked functions to return
  74    a register valid indication.  Given the possibility of such a
  75    change, the extract functions below use a reference parameter,
  76    rather than a function result.  */
  77
  78 /* Read a register as a signed/unsigned quantity.  */
  79 extern void regcache_cooked_read_signed (struct regcache *regcache,
  80                                          int regnum, LONGEST *val);
  81 extern void regcache_cooked_read_unsigned (struct regcache *regcache,
  82                                            int regnum, ULONGEST *val);
  83 extern void regcache_cooked_write_signed (struct regcache *regcache,
  84                                           int regnum, LONGEST val);
  85 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
  86                                             int regnum, ULONGEST val);
  87
  88 /* Partial transfer of a cooked register.  These perform read, modify,
  89    write style operations.  */
  90
  91 void regcache_cooked_read_part (struct regcache *regcache, int regnum,
  92                                 int offset, int len, gdb_byte *buf);
  93 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
  94                                  int offset, int len, const gdb_byte *buf);
  95
  96 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
  97    target.  These functions are called by the target in response to a
  98    target_fetch_registers() or target_store_registers().  */
  99
 100 extern void regcache_raw_supply (struct regcache *regcache,
 101                                  int regnum, const gdb_byte *buf);
 102 extern void regcache_raw_collect (const struct regcache *regcache,
 103                                   int regnum, gdb_byte *buf);
 104
 105
 106 /* The register's ``offset''.
 107
 108    FIXME: cagney/2002-11-07: The frame_register() function, when
 109    specifying the real location of a register, does so using that
 110    registers offset in the register cache.  That offset is then used
 111    by valops.c to determine the location of the register.  The code
 112    should instead use the register's number and a location expression
 113    to describe a value spread across multiple registers or memory.  */
 114
 115 extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
 116
 117 /* Similar.  The total number of bytes occupied by a regcache.  */
 118
 119 extern int deprecated_register_bytes (void );
 120
 121
 122 /* The type of a register.  This function is slightly more efficient
 123    then its gdbarch vector counterpart since it returns a precomputed
 124    value stored in a table.  */
 125
 126 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
 127
 128
 129 /* Return the size of register REGNUM.  All registers should have only
 130    one size.  */
 131
 132 extern int register_size (struct gdbarch *gdbarch, int regnum);
 133
 134
 135 /* Save/restore a register cache.  The set of registers saved /
 136    restored into the DST regcache determined by the save_reggroup /
 137    restore_reggroup respectively.  COOKED_READ returns zero iff the
 138    register's value can't be returned.  */
 139
 140 typedef int (regcache_cooked_read_ftype) (void *src, int regnum,
 141                                           gdb_byte *buf);
 142
 143 extern void regcache_save (struct regcache *dst,
 144                            regcache_cooked_read_ftype *cooked_read,
 145                            void *cooked_read_context);
 146 extern void regcache_restore (struct regcache *dst,
 147                               regcache_cooked_read_ftype *cooked_read,
 148                               void *cooked_read_context);
 149
 150 /* Copy/duplicate the contents of a register cache.  By default, the
 151    operation is pass-through.  Writes to DST and reads from SRC will
 152    go through to the target.
 153
 154    The ``cpy'' functions can not have overlapping SRC and DST buffers.
 155
 156    ``no passthrough'' versions do not go through to the target.  They
 157    only transfer values already in the cache.  */
 158
 159 extern struct regcache *regcache_dup (struct regcache *regcache);
 160 extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
 161 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
 162 extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
 163
 164 /* NOTE: cagney/2002-11-02: The below have been superseded by the
 165    regcache_cooked_*() functions found above, and the frame_*()
 166    functions found in "frame.h".  Take care though, often more than a
 167    simple substitution is required when updating the code.  The
 168    change, as far as practical, should avoid adding references to
 169    global variables (e.g., current_regcache, current_frame,
 170    current_gdbarch or deprecated_selected_frame) and instead refer to
 171    the FRAME or REGCACHE that has been passed into the containing
 172    function as parameters.  Consequently, the change typically
 173    involves modifying the containing function so that it takes a FRAME
 174    or REGCACHE parameter.  In the case of an architecture vector
 175    method, there should already be a non-deprecated variant that is
 176    parameterized with FRAME or REGCACHE.  */
 177
 178 extern gdb_byte *deprecated_grub_regcache_for_registers (struct regcache *);
 179 extern void deprecated_read_register_gen (int regnum, gdb_byte *myaddr);
 180 extern void deprecated_write_register_gen (int regnum, gdb_byte *myaddr);
 181 extern void deprecated_read_register_bytes (int regbyte, gdb_byte *myaddr,
 182                                             int len);
 183 extern void deprecated_write_register_bytes (int regbyte, gdb_byte *myaddr,
 184                                              int len);
 185
 186 /* NOTE: cagney/2002-11-05: This function has been superseeded by
 187    regcache_raw_supply().  */
 188 extern void deprecated_registers_fetched (void);
 189
 190 extern int register_cached (int regnum);
 191
 192 extern void set_register_cached (int regnum, int state);
 193
 194 extern void registers_changed (void);
 195
 196
 197 /* Rename to read_unsigned_register()? */
 198 extern ULONGEST read_register (int regnum);
 199
 200 /* Rename to read_unsigned_register_pid()? */
 201 extern ULONGEST read_register_pid (int regnum, ptid_t ptid);
 202
 203 extern void write_register (int regnum, LONGEST val);
 204
 205 extern void write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid);
 206
 207 #endif /* REGCACHE_H */