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 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., 51 Franklin Street, Fifth Floor,
  21    Boston, MA 02110-1301, USA.  */
  22
  23 #ifndef REGCACHE_H
  24 #define REGCACHE_H
  25
  26 struct regcache;
  27 struct gdbarch;
  28
  29 extern struct regcache *get_current_regcache (void);
  30 extern struct regcache *get_thread_regcache (ptid_t ptid);
  31
  32 void regcache_xfree (struct regcache *regcache);
  33 struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
  34 struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
  35
  36 /* Return REGCACHE's architecture.  */
  37
  38 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
  39
  40 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
  41    regcache. */
  42
  43 void regcache_raw_read (struct regcache *regcache, int rawnum, gdb_byte *buf);
  44 void regcache_raw_write (struct regcache *regcache, int rawnum,
  45                          const gdb_byte *buf);
  46 extern void regcache_raw_read_signed (struct regcache *regcache,
  47                                       int regnum, LONGEST *val);
  48 extern void regcache_raw_read_unsigned (struct regcache *regcache,
  49                                         int regnum, ULONGEST *val);
  50 extern void regcache_raw_write_signed (struct regcache *regcache,
  51                                        int regnum, LONGEST val);
  52 extern void regcache_raw_write_unsigned (struct regcache *regcache,
  53                                          int regnum, ULONGEST val);
  54
  55 /* Partial transfer of a raw registers.  These perform read, modify,
  56    write style operations.  */
  57
  58 void regcache_raw_read_part (struct regcache *regcache, int regnum,
  59                              int offset, int len, gdb_byte *buf);
  60 void regcache_raw_write_part (struct regcache *regcache, int regnum,
  61                               int offset, int len, const gdb_byte *buf);
  62
  63 int regcache_valid_p (const struct regcache *regcache, int regnum);
  64
  65 void regcache_invalidate (struct regcache *regcache, int regnum);
  66
  67 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */
  68 void regcache_cooked_read (struct regcache *regcache, int rawnum,
  69                            gdb_byte *buf);
  70 void regcache_cooked_write (struct regcache *regcache, int rawnum,
  71                             const gdb_byte *buf);
  72
  73 /* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
  74    for indicating when a ``cooked'' register was constructed from
  75    invalid or unavailable ``raw'' registers.  One fairly easy way of
  76    adding such a mechanism would be for the cooked functions to return
  77    a register valid indication.  Given the possibility of such a
  78    change, the extract functions below use a reference parameter,
  79    rather than a function result.  */
  80
  81 /* Read a register as a signed/unsigned quantity.  */
  82 extern void regcache_cooked_read_signed (struct regcache *regcache,
  83                                          int regnum, LONGEST *val);
  84 extern void regcache_cooked_read_unsigned (struct regcache *regcache,
  85                                            int regnum, ULONGEST *val);
  86 extern void regcache_cooked_write_signed (struct regcache *regcache,
  87                                           int regnum, LONGEST val);
  88 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
  89                                             int regnum, ULONGEST val);
  90
  91 /* Partial transfer of a cooked register.  These perform read, modify,
  92    write style operations.  */
  93
  94 void regcache_cooked_read_part (struct regcache *regcache, int regnum,
  95                                 int offset, int len, gdb_byte *buf);
  96 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
  97                                  int offset, int len, const gdb_byte *buf);
  98
  99 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
 100    target.  These functions are called by the target in response to a
 101    target_fetch_registers() or target_store_registers().  */
 102
 103 extern void regcache_raw_supply (struct regcache *regcache,
 104                                  int regnum, const void *buf);
 105 extern void regcache_raw_collect (const struct regcache *regcache,
 106                                   int regnum, void *buf);
 107
 108
 109 /* The register's ``offset''.
 110
 111    FIXME: cagney/2002-11-07: The frame_register() function, when
 112    specifying the real location of a register, does so using that
 113    registers offset in the register cache.  That offset is then used
 114    by valops.c to determine the location of the register.  The code
 115    should instead use the register's number and a location expression
 116    to describe a value spread across multiple registers or memory.  */
 117
 118 extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
 119
 120
 121 /* The type of a register.  This function is slightly more efficient
 122    then its gdbarch vector counterpart since it returns a precomputed
 123    value stored in a table.  */
 124
 125 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
 126
 127
 128 /* Return the size of register REGNUM.  All registers should have only
 129    one size.  */
 130
 131 extern int register_size (struct gdbarch *gdbarch, int regnum);
 132
 133
 134 /* Save/restore a register cache.  The set of registers saved /
 135    restored into the DST regcache determined by the save_reggroup /
 136    restore_reggroup respectively.  COOKED_READ returns zero iff the
 137    register's value can't be returned.  */
 138
 139 typedef int (regcache_cooked_read_ftype) (void *src, int regnum,
 140                                           gdb_byte *buf);
 141
 142 extern void regcache_save (struct regcache *dst,
 143                            regcache_cooked_read_ftype *cooked_read,
 144                            void *cooked_read_context);
 145 extern void regcache_restore (struct regcache *dst,
 146                               regcache_cooked_read_ftype *cooked_read,
 147                               void *cooked_read_context);
 148
 149 /* Copy/duplicate the contents of a register cache.  By default, the
 150    operation is pass-through.  Writes to DST and reads from SRC will
 151    go through to the target.
 152
 153    The ``cpy'' functions can not have overlapping SRC and DST buffers.
 154
 155    ``no passthrough'' versions do not go through to the target.  They
 156    only transfer values already in the cache.  */
 157
 158 extern struct regcache *regcache_dup (struct regcache *regcache);
 159 extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
 160 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
 161 extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
 162
 163 extern void registers_changed (void);
 164
 165 #endif /* REGCACHE_H */