gdb/regcache.h

   1 /* Cache and manage the values of registers for GDB, the GNU debugger.
   2
   3    Copyright (C) 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001,
   4    2002, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef REGCACHE_H
  22 #define REGCACHE_H
  23
  24 struct regcache;
  25 struct gdbarch;
  26
  27 extern struct regcache *get_current_regcache (void);
  28 extern struct regcache *get_thread_regcache (ptid_t ptid);
  29
  30 void regcache_xfree (struct regcache *regcache);
  31 struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
  32 struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
  33
  34 /* Return REGCACHE's architecture.  */
  35
  36 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
  37
  38 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
  39    regcache. */
  40
  41 void regcache_raw_read (struct regcache *regcache, int rawnum, gdb_byte *buf);
  42 void regcache_raw_write (struct regcache *regcache, int rawnum,
  43                          const gdb_byte *buf);
  44 extern void regcache_raw_read_signed (struct regcache *regcache,
  45                                       int regnum, LONGEST *val);
  46 extern void regcache_raw_read_unsigned (struct regcache *regcache,
  47                                         int regnum, ULONGEST *val);
  48 extern void regcache_raw_write_signed (struct regcache *regcache,
  49                                        int regnum, LONGEST val);
  50 extern void regcache_raw_write_unsigned (struct regcache *regcache,
  51                                          int regnum, ULONGEST val);
  52
  53 /* Partial transfer of a raw registers.  These perform read, modify,
  54    write style operations.  */
  55
  56 void regcache_raw_read_part (struct regcache *regcache, int regnum,
  57                              int offset, int len, gdb_byte *buf);
  58 void regcache_raw_write_part (struct regcache *regcache, int regnum,
  59                               int offset, int len, const gdb_byte *buf);
  60
  61 int regcache_valid_p (const struct regcache *regcache, int regnum);
  62
  63 void regcache_invalidate (struct regcache *regcache, int regnum);
  64
  65 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */
  66 void regcache_cooked_read (struct regcache *regcache, int rawnum,
  67                            gdb_byte *buf);
  68 void regcache_cooked_write (struct regcache *regcache, int rawnum,
  69                             const gdb_byte *buf);
  70
  71 /* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
  72    for indicating when a ``cooked'' register was constructed from
  73    invalid or unavailable ``raw'' registers.  One fairly easy way of
  74    adding such a mechanism would be for the cooked functions to return
  75    a register valid indication.  Given the possibility of such a
  76    change, the extract functions below use a reference parameter,
  77    rather than a function result.  */
  78
  79 /* Read a register as a signed/unsigned quantity.  */
  80 extern void regcache_cooked_read_signed (struct regcache *regcache,
  81                                          int regnum, LONGEST *val);
  82 extern void regcache_cooked_read_unsigned (struct regcache *regcache,
  83                                            int regnum, ULONGEST *val);
  84 extern void regcache_cooked_write_signed (struct regcache *regcache,
  85                                           int regnum, LONGEST val);
  86 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
  87                                             int regnum, ULONGEST val);
  88
  89 /* Partial transfer of a cooked register.  These perform read, modify,
  90    write style operations.  */
  91
  92 void regcache_cooked_read_part (struct regcache *regcache, int regnum,
  93                                 int offset, int len, gdb_byte *buf);
  94 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
  95                                  int offset, int len, const gdb_byte *buf);
  96
  97 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
  98    target.  These functions are called by the target in response to a
  99    target_fetch_registers() or target_store_registers().  */
 100
 101 extern void regcache_raw_supply (struct regcache *regcache,
 102                                  int regnum, const void *buf);
 103 extern void regcache_raw_collect (const struct regcache *regcache,
 104                                   int regnum, void *buf);
 105
 106
 107 /* The register's ``offset''.
 108
 109    FIXME: cagney/2002-11-07: The frame_register() function, when
 110    specifying the real location of a register, does so using that
 111    registers offset in the register cache.  That offset is then used
 112    by valops.c to determine the location of the register.  The code
 113    should instead use the register's number and a location expression
 114    to describe a value spread across multiple registers or memory.  */
 115
 116 extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
 117
 118
 119 /* The type of a register.  This function is slightly more efficient
 120    then its gdbarch vector counterpart since it returns a precomputed
 121    value stored in a table.  */
 122
 123 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
 124
 125
 126 /* Return the size of register REGNUM.  All registers should have only
 127    one size.  */
 128
 129 extern int register_size (struct gdbarch *gdbarch, int regnum);
 130
 131
 132 /* Save/restore a register cache.  The set of registers saved /
 133    restored into the DST regcache determined by the save_reggroup /
 134    restore_reggroup respectively.  COOKED_READ returns zero iff the
 135    register's value can't be returned.  */
 136
 137 typedef int (regcache_cooked_read_ftype) (void *src, int regnum,
 138                                           gdb_byte *buf);
 139
 140 extern void regcache_save (struct regcache *dst,
 141                            regcache_cooked_read_ftype *cooked_read,
 142                            void *cooked_read_context);
 143 extern void regcache_restore (struct regcache *dst,
 144                               regcache_cooked_read_ftype *cooked_read,
 145                               void *cooked_read_context);
 146
 147 /* Copy/duplicate the contents of a register cache.  By default, the
 148    operation is pass-through.  Writes to DST and reads from SRC will
 149    go through to the target.
 150
 151    The ``cpy'' functions can not have overlapping SRC and DST buffers.
 152
 153    ``no passthrough'' versions do not go through to the target.  They
 154    only transfer values already in the cache.  */
 155
 156 extern struct regcache *regcache_dup (struct regcache *regcache);
 157 extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
 158 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
 159 extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
 160
 161 extern void registers_changed (void);
 162
 163 #endif /* REGCACHE_H */