gdb/gdbserver/regcache.h

   1 /* Register support routines for the remote server for GDB.
   2    Copyright (C) 2001-2014 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef REGCACHE_H
  20 #define REGCACHE_H
  21
  22 struct thread_info;
  23 struct target_desc;
  24
  25 /* The register exists, it has a value, but we don't know what it is.
  26    Used when inspecting traceframes.  */
  27 #define REG_UNAVAILABLE 0
  28
  29 /* We know the register's value (and we have it cached).  */
  30 #define REG_VALID 1
  31
  32 /* The data for the register cache.  Note that we have one per
  33    inferior; this is primarily for simplicity, as the performance
  34    benefit is minimal.  */
  35
  36 struct regcache
  37 {
  38   /* The regcache's target description.  */
  39   const struct target_desc *tdesc;
  40
  41   /* Whether the REGISTERS buffer's contents are valid.  If false, we
  42      haven't fetched the registers from the target yet.  Not that this
  43      register cache is _not_ pass-through, unlike GDB's.  Note that
  44      "valid" here is unrelated to whether the registers are available
  45      in a traceframe.  For that, check REGISTER_STATUS below.  */
  46   int registers_valid;
  47   int registers_owned;
  48   unsigned char *registers;
  49 #ifndef IN_PROCESS_AGENT
  50   /* One of REG_UNAVAILBLE or REG_VALID.  */
  51   unsigned char *register_status;
  52 #endif
  53 };
  54
  55 struct regcache *init_register_cache (struct regcache *regcache,
  56                                       const struct target_desc *tdesc,
  57                                       unsigned char *regbuf);
  58
  59 void regcache_cpy (struct regcache *dst, struct regcache *src);
  60
  61 /* Create a new register cache for INFERIOR.  */
  62
  63 struct regcache *new_register_cache (const struct target_desc *tdesc);
  64
  65 struct regcache *get_thread_regcache (struct thread_info *thread, int fetch);
  66
  67 /* Release all memory associated with the register cache for INFERIOR.  */
  68
  69 void free_register_cache (struct regcache *regcache);
  70
  71 /* Invalidate cached registers for one thread.  */
  72
  73 void regcache_invalidate_thread (struct thread_info *);
  74
  75 /* Invalidate cached registers for all threads of the current
  76    process.  */
  77
  78 void regcache_invalidate (void);
  79
  80 /* Invalidate and release the register cache of all threads of the
  81    current process.  */
  82
  83 void regcache_release (void);
  84
  85 /* Convert all registers to a string in the currently specified remote
  86    format.  */
  87
  88 void registers_to_string (struct regcache *regcache, char *buf);
  89
  90 /* Convert a string to register values and fill our register cache.  */
  91
  92 void registers_from_string (struct regcache *regcache, char *buf);
  93
  94 CORE_ADDR regcache_read_pc (struct regcache *regcache);
  95
  96 void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
  97
  98 /* Return a pointer to the description of register ``n''.  */
  99
 100 struct reg *find_register_by_number (const struct target_desc *tdesc, int n);
 101
 102 int register_cache_size (const struct target_desc *tdesc);
 103
 104 int register_size (const struct target_desc *tdesc, int n);
 105
 106 int find_regno (const struct target_desc *tdesc, const char *name);
 107
 108 void supply_register (struct regcache *regcache, int n, const void *buf);
 109
 110 void supply_register_zeroed (struct regcache *regcache, int n);
 111
 112 void supply_register_by_name (struct regcache *regcache,
 113                               const char *name, const void *buf);
 114
 115 void supply_regblock (struct regcache *regcache, const void *buf);
 116
 117 void collect_register (struct regcache *regcache, int n, void *buf);
 118
 119 void collect_register_as_string (struct regcache *regcache, int n, char *buf);
 120
 121 void collect_register_by_name (struct regcache *regcache,
 122                                const char *name, void *buf);
 123
 124 #endif /* REGCACHE_H */