1 /* Cache and manage the values of registers for GDB, the GNU debugger.
3 Copyright (C) 1986-2015 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 *);
52 /* The register value is not in the cache, and we don't know yet
53 whether it's available in the target (or traceframe). */
56 /* The register value is valid and cached. */
59 /* The register value is unavailable. E.g., we're inspecting a
60 traceframe, and this register wasn't collected. Note that this
61 is different a different "unavailable" from saying the register
62 does not exist in the target's architecture --- in that case,
63 the target should have given us a target description that does
64 not include the register in the first place. */
68 enum register_status regcache_register_status (const struct regcache *regcache,
71 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
72 regcache. The read variants return the status of the register. */
74 enum register_status regcache_raw_read (struct regcache *regcache,
75 int rawnum, gdb_byte *buf);
76 void regcache_raw_write (struct regcache *regcache, int rawnum,
78 extern enum register_status
79 regcache_raw_read_signed (struct regcache *regcache,
80 int regnum, LONGEST *val);
81 extern enum register_status
82 regcache_raw_read_unsigned (struct regcache *regcache,
83 int regnum, ULONGEST *val);
85 ULONGEST regcache_raw_get_unsigned (struct regcache *regcache,
88 extern void regcache_raw_write_signed (struct regcache *regcache,
89 int regnum, LONGEST val);
90 extern void regcache_raw_write_unsigned (struct regcache *regcache,
91 int regnum, ULONGEST val);
93 /* Partial transfer of raw registers. These perform read, modify,
94 write style operations. The read variant returns the status of the
97 extern enum register_status
98 regcache_raw_read_part (struct regcache *regcache, int regnum,
99 int offset, int len, gdb_byte *buf);
100 void regcache_raw_write_part (struct regcache *regcache, int regnum,
101 int offset, int len, const gdb_byte *buf);
103 void regcache_invalidate (struct regcache *regcache, int regnum);
105 /* Transfer of pseudo-registers. The read variants return a register
106 status, as an indication of when a ``cooked'' register was
107 constructed from valid, invalid or unavailable ``raw''
110 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
111 enum register_status regcache_cooked_read (struct regcache *regcache,
112 int rawnum, gdb_byte *buf);
113 void regcache_cooked_write (struct regcache *regcache, int rawnum,
114 const gdb_byte *buf);
116 /* Read register REGNUM from REGCACHE and return a new value. This
117 will call mark_value_bytes_unavailable as appropriate. */
119 struct value *regcache_cooked_read_value (struct regcache *regcache,
122 /* Read a register as a signed/unsigned quantity. */
123 extern enum register_status
124 regcache_cooked_read_signed (struct regcache *regcache,
125 int regnum, LONGEST *val);
126 extern enum register_status
127 regcache_cooked_read_unsigned (struct regcache *regcache,
128 int regnum, ULONGEST *val);
129 extern void regcache_cooked_write_signed (struct regcache *regcache,
130 int regnum, LONGEST val);
131 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
132 int regnum, ULONGEST val);
134 /* Partial transfer of a cooked register. These perform read, modify,
135 write style operations. */
137 enum register_status regcache_cooked_read_part (struct regcache *regcache,
138 int regnum, int offset,
139 int len, gdb_byte *buf);
140 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
141 int offset, int len, const gdb_byte *buf);
143 /* Special routines to read/write the PC. */
145 /* For regcache_read_pc see common/common-regcache.h. */
146 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
148 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
149 target. These functions are called by the target in response to a
150 target_fetch_registers() or target_store_registers(). */
152 extern void regcache_raw_supply (struct regcache *regcache,
153 int regnum, const void *buf);
154 extern void regcache_raw_collect (const struct regcache *regcache,
155 int regnum, void *buf);
157 /* Mapping between register numbers and offsets in a buffer, for use
158 in the '*regset' functions below. In an array of
159 'regcache_map_entry' each element is interpreted like follows:
161 - If 'regno' is a register number: Map register 'regno' to the
162 current offset (starting with 0) and increase the current offset
163 by 'size' (or the register's size, if 'size' is zero). Repeat
164 this with consecutive register numbers up to 'regno+count-1'.
166 - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
169 - If count=0: End of the map. */
171 struct regcache_map_entry
178 /* Special value for the 'regno' field in the struct above. */
182 REGCACHE_MAP_SKIP = -1,
185 /* Transfer a set of registers (as described by REGSET) between
186 REGCACHE and BUF. If REGNUM == -1, transfer all registers
187 belonging to the regset, otherwise just the register numbered
188 REGNUM. The REGSET's 'regmap' field must point to an array of
189 'struct regcache_map_entry'.
191 These functions are suitable for the 'regset_supply' and
192 'regset_collect' fields in a regset structure. */
194 extern void regcache_supply_regset (const struct regset *regset,
195 struct regcache *regcache,
196 int regnum, const void *buf,
198 extern void regcache_collect_regset (const struct regset *regset,
199 const struct regcache *regcache,
200 int regnum, void *buf, size_t size);
203 /* The type of a register. This function is slightly more efficient
204 then its gdbarch vector counterpart since it returns a precomputed
205 value stored in a table. */
207 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
210 /* Return the size of register REGNUM. All registers should have only
213 extern int register_size (struct gdbarch *gdbarch, int regnum);
216 /* Save/restore a register cache. The set of registers saved /
217 restored into the DST regcache determined by the save_reggroup /
218 restore_reggroup respectively. COOKED_READ returns zero iff the
219 register's value can't be returned. */
221 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
225 extern void regcache_save (struct regcache *dst,
226 regcache_cooked_read_ftype *cooked_read,
227 void *cooked_read_context);
229 /* Copy/duplicate the contents of a register cache. By default, the
230 operation is pass-through. Writes to DST and reads from SRC will
231 go through to the target. See also regcache_cpy_no_passthrough.
233 regcache_cpy can not have overlapping SRC and DST buffers. */
235 extern struct regcache *regcache_dup (struct regcache *regcache);
236 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
238 extern void registers_changed (void);
239 extern void registers_changed_ptid (ptid_t);
241 #endif /* REGCACHE_H */