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, 2009, 2010, 2011 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 struct address_space;
  27
  28 extern struct regcache *get_current_regcache (void);
  29 extern struct regcache *get_thread_regcache (ptid_t ptid);
  30 extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
  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                                    struct address_space *aspace);
  36
  37 /* Return REGCACHE's architecture.  */
  38
  39 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
  40
  41 /* Return REGCACHE's address space.  */
  42
  43 extern struct address_space *get_regcache_aspace (const struct regcache *);
  44
  45 enum register_status
  46   {
  47     /* The register value is not in the cache, and we don't know yet
  48        whether it's available in the target (or traceframe).  */
  49     REG_UNKNOWN = 0,
  50
  51     /* The register value is valid and cached.  */
  52     REG_VALID = 1,
  53
  54     /* The register value is unavailable.  E.g., we're inspecting a
  55        traceframe, and this register wasn't collected.  Note that this
  56        is different a different "unavailable" from saying the register
  57        does not exist in the target's architecture --- in that case,
  58        the target should have given us a target description that does
  59        not include the register in the first place.  */
  60     REG_UNAVAILABLE = -1
  61   };
  62
  63 enum register_status regcache_register_status (const struct regcache *regcache,
  64                                                int regnum);
  65
  66 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
  67    regcache.  The read variants return the status of the register.  */
  68
  69 enum register_status regcache_raw_read (struct regcache *regcache,
  70                                         int rawnum, gdb_byte *buf);
  71 void regcache_raw_write (struct regcache *regcache, int rawnum,
  72                          const gdb_byte *buf);
  73 extern enum register_status
  74   regcache_raw_read_signed (struct regcache *regcache,
  75                             int regnum, LONGEST *val);
  76 extern enum register_status
  77   regcache_raw_read_unsigned (struct regcache *regcache,
  78                               int regnum, ULONGEST *val);
  79 extern void regcache_raw_write_signed (struct regcache *regcache,
  80                                        int regnum, LONGEST val);
  81 extern void regcache_raw_write_unsigned (struct regcache *regcache,
  82                                          int regnum, ULONGEST val);
  83
  84 /* Partial transfer of raw registers.  These perform read, modify,
  85    write style operations.  The read variant returns the status of the
  86    register.  */
  87
  88 extern enum register_status
  89   regcache_raw_read_part (struct regcache *regcache, int regnum,
  90                           int offset, int len, gdb_byte *buf);
  91 void regcache_raw_write_part (struct regcache *regcache, int regnum,
  92                               int offset, int len, const gdb_byte *buf);
  93
  94 void regcache_invalidate (struct regcache *regcache, int regnum);
  95
  96 /* Transfer of pseudo-registers.  The read variants return a register
  97    status, as an indication of when a ``cooked'' register was
  98    constructed from valid, invalid or unavailable ``raw''
  99    registers.  */
 100
 101 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS).  */
 102 enum register_status regcache_cooked_read (struct regcache *regcache,
 103                                            int rawnum, gdb_byte *buf);
 104 void regcache_cooked_write (struct regcache *regcache, int rawnum,
 105                             const gdb_byte *buf);
 106
 107 /* Read a register as a signed/unsigned quantity.  */
 108 extern enum register_status
 109   regcache_cooked_read_signed (struct regcache *regcache,
 110                                int regnum, LONGEST *val);
 111 extern enum register_status
 112   regcache_cooked_read_unsigned (struct regcache *regcache,
 113                                  int regnum, ULONGEST *val);
 114 extern void regcache_cooked_write_signed (struct regcache *regcache,
 115                                           int regnum, LONGEST val);
 116 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
 117                                             int regnum, ULONGEST val);
 118
 119 /* Partial transfer of a cooked register.  These perform read, modify,
 120    write style operations.  */
 121
 122 enum register_status regcache_cooked_read_part (struct regcache *regcache,
 123                                                 int regnum, int offset,
 124                                                 int len, gdb_byte *buf);
 125 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
 126                                  int offset, int len, const gdb_byte *buf);
 127
 128 /* Special routines to read/write the PC.  */
 129
 130 extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
 131 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
 132
 133 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
 134    target.  These functions are called by the target in response to a
 135    target_fetch_registers() or target_store_registers().  */
 136
 137 extern void regcache_raw_supply (struct regcache *regcache,
 138                                  int regnum, const void *buf);
 139 extern void regcache_raw_collect (const struct regcache *regcache,
 140                                   int regnum, void *buf);
 141
 142
 143 /* The type of a register.  This function is slightly more efficient
 144    then its gdbarch vector counterpart since it returns a precomputed
 145    value stored in a table.  */
 146
 147 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
 148
 149
 150 /* Return the size of register REGNUM.  All registers should have only
 151    one size.  */
 152
 153 extern int register_size (struct gdbarch *gdbarch, int regnum);
 154
 155
 156 /* Save/restore a register cache.  The set of registers saved /
 157    restored into the DST regcache determined by the save_reggroup /
 158    restore_reggroup respectively.  COOKED_READ returns zero iff the
 159    register's value can't be returned.  */
 160
 161 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
 162                                                            int regnum,
 163                                                            gdb_byte *buf);
 164
 165 extern void regcache_save (struct regcache *dst,
 166                            regcache_cooked_read_ftype *cooked_read,
 167                            void *cooked_read_context);
 168 extern void regcache_restore (struct regcache *dst,
 169                               regcache_cooked_read_ftype *cooked_read,
 170                               void *cooked_read_context);
 171
 172 /* Copy/duplicate the contents of a register cache.  By default, the
 173    operation is pass-through.  Writes to DST and reads from SRC will
 174    go through to the target.
 175
 176    The ``cpy'' functions can not have overlapping SRC and DST buffers.
 177
 178    ``no passthrough'' versions do not go through to the target.  They
 179    only transfer values already in the cache.  */
 180
 181 extern struct regcache *regcache_dup (struct regcache *regcache);
 182 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
 183 extern void regcache_cpy_no_passthrough (struct regcache *dest,
 184                                          struct regcache *src);
 185
 186 extern void registers_changed (void);
 187 extern void registers_changed_ptid (ptid_t);
 188
 189 #endif /* REGCACHE_H */