1 /* Cache and manage the values of registers for GDB, the GNU debugger.
3 Copyright (C) 1986-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "common-regcache.h"
30 extern struct regcache *get_current_regcache (void);
31 extern struct regcache *get_thread_regcache (ptid_t ptid);
32 extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
33 extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
35 struct address_space *);
37 void regcache_xfree (struct regcache *regcache);
38 struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
39 struct regcache *regcache_xmalloc (struct gdbarch *gdbarch,
40 struct address_space *aspace);
42 /* Return REGCACHE's architecture. */
44 extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
46 /* Return REGCACHE's address space. */
48 extern struct address_space *get_regcache_aspace (const struct regcache *);
50 enum register_status regcache_register_status (const struct regcache *regcache,
53 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
54 regcache. The read variants return the status of the register. */
56 enum register_status regcache_raw_read (struct regcache *regcache,
57 int rawnum, gdb_byte *buf);
58 void regcache_raw_write (struct regcache *regcache, int rawnum,
60 extern enum register_status
61 regcache_raw_read_signed (struct regcache *regcache,
62 int regnum, LONGEST *val);
64 extern void regcache_raw_write_signed (struct regcache *regcache,
65 int regnum, LONGEST val);
66 extern void regcache_raw_write_unsigned (struct regcache *regcache,
67 int regnum, ULONGEST val);
69 /* Return the register's value in signed or throw if it's not
72 extern LONGEST regcache_raw_get_signed (struct regcache *regcache,
75 /* Set a raw register's value in the regcache's buffer. Unlike
76 regcache_raw_write, this is not write-through. The intention is
77 allowing to change the buffer contents of a read-only regcache
78 allocated with regcache_xmalloc. */
80 extern void regcache_raw_set_cached_value
81 (struct regcache *regcache, int regnum, const gdb_byte *buf);
83 /* Partial transfer of raw registers. These perform read, modify,
84 write style operations. The read variant returns the status of the
87 extern enum register_status
88 regcache_raw_read_part (struct regcache *regcache, int regnum,
89 int offset, int len, gdb_byte *buf);
90 void regcache_raw_write_part (struct regcache *regcache, int regnum,
91 int offset, int len, const gdb_byte *buf);
93 void regcache_invalidate (struct regcache *regcache, int regnum);
95 /* Transfer of pseudo-registers. The read variants return a register
96 status, as an indication of when a ``cooked'' register was
97 constructed from valid, invalid or unavailable ``raw''
100 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
101 enum register_status regcache_cooked_read (struct regcache *regcache,
102 int rawnum, gdb_byte *buf);
103 void regcache_cooked_write (struct regcache *regcache, int rawnum,
104 const gdb_byte *buf);
106 /* Read register REGNUM from REGCACHE and return a new value. This
107 will call mark_value_bytes_unavailable as appropriate. */
109 struct value *regcache_cooked_read_value (struct regcache *regcache,
112 /* Read a register as a signed/unsigned quantity. */
113 extern enum register_status
114 regcache_cooked_read_signed (struct regcache *regcache,
115 int regnum, LONGEST *val);
116 extern enum register_status
117 regcache_cooked_read_unsigned (struct regcache *regcache,
118 int regnum, ULONGEST *val);
119 extern void regcache_cooked_write_signed (struct regcache *regcache,
120 int regnum, LONGEST val);
121 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
122 int regnum, ULONGEST val);
124 /* Partial transfer of a cooked register. These perform read, modify,
125 write style operations. */
127 enum register_status regcache_cooked_read_part (struct regcache *regcache,
128 int regnum, int offset,
129 int len, gdb_byte *buf);
130 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
131 int offset, int len, const gdb_byte *buf);
133 /* Special routines to read/write the PC. */
135 /* For regcache_read_pc see common/common-regcache.h. */
136 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
138 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
139 target. These functions are called by the target in response to a
140 target_fetch_registers() or target_store_registers(). */
142 extern void regcache_raw_supply (struct regcache *regcache,
143 int regnum, const void *buf);
144 extern void regcache_raw_collect (const struct regcache *regcache,
145 int regnum, void *buf);
147 /* Mapping between register numbers and offsets in a buffer, for use
148 in the '*regset' functions below. In an array of
149 'regcache_map_entry' each element is interpreted like follows:
151 - If 'regno' is a register number: Map register 'regno' to the
152 current offset (starting with 0) and increase the current offset
153 by 'size' (or the register's size, if 'size' is zero). Repeat
154 this with consecutive register numbers up to 'regno+count-1'.
156 - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
159 - If count=0: End of the map. */
161 struct regcache_map_entry
168 /* Special value for the 'regno' field in the struct above. */
172 REGCACHE_MAP_SKIP = -1,
175 /* Transfer a set of registers (as described by REGSET) between
176 REGCACHE and BUF. If REGNUM == -1, transfer all registers
177 belonging to the regset, otherwise just the register numbered
178 REGNUM. The REGSET's 'regmap' field must point to an array of
179 'struct regcache_map_entry'.
181 These functions are suitable for the 'regset_supply' and
182 'regset_collect' fields in a regset structure. */
184 extern void regcache_supply_regset (const struct regset *regset,
185 struct regcache *regcache,
186 int regnum, const void *buf,
188 extern void regcache_collect_regset (const struct regset *regset,
189 const struct regcache *regcache,
190 int regnum, void *buf, size_t size);
193 /* The type of a register. This function is slightly more efficient
194 then its gdbarch vector counterpart since it returns a precomputed
195 value stored in a table. */
197 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
200 /* Return the size of register REGNUM. All registers should have only
203 extern int register_size (struct gdbarch *gdbarch, int regnum);
206 /* Save/restore a register cache. The set of registers saved /
207 restored into the DST regcache determined by the save_reggroup /
208 restore_reggroup respectively. COOKED_READ returns zero iff the
209 register's value can't be returned. */
211 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
215 extern void regcache_save (struct regcache *dst,
216 regcache_cooked_read_ftype *cooked_read,
217 void *cooked_read_context);
219 /* Copy/duplicate the contents of a register cache. By default, the
220 operation is pass-through. Writes to DST and reads from SRC will
221 go through to the target. See also regcache_cpy_no_passthrough.
223 regcache_cpy can not have overlapping SRC and DST buffers. */
225 extern struct regcache *regcache_dup (struct regcache *regcache);
226 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
228 extern void registers_changed (void);
229 extern void registers_changed_ptid (ptid_t);
231 #endif /* REGCACHE_H */