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);
84 extern void regcache_raw_write_signed (struct regcache *regcache,
85 int regnum, LONGEST val);
86 extern void regcache_raw_write_unsigned (struct regcache *regcache,
87 int regnum, ULONGEST val);
89 /* Partial transfer of raw registers. These perform read, modify,
90 write style operations. The read variant returns the status of the
93 extern enum register_status
94 regcache_raw_read_part (struct regcache *regcache, int regnum,
95 int offset, int len, gdb_byte *buf);
96 void regcache_raw_write_part (struct regcache *regcache, int regnum,
97 int offset, int len, const gdb_byte *buf);
99 void regcache_invalidate (struct regcache *regcache, int regnum);
101 /* Transfer of pseudo-registers. The read variants return a register
102 status, as an indication of when a ``cooked'' register was
103 constructed from valid, invalid or unavailable ``raw''
106 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
107 enum register_status regcache_cooked_read (struct regcache *regcache,
108 int rawnum, gdb_byte *buf);
109 void regcache_cooked_write (struct regcache *regcache, int rawnum,
110 const gdb_byte *buf);
112 /* Read register REGNUM from REGCACHE and return a new value. This
113 will call mark_value_bytes_unavailable as appropriate. */
115 struct value *regcache_cooked_read_value (struct regcache *regcache,
118 /* Read a register as a signed/unsigned quantity. */
119 extern enum register_status
120 regcache_cooked_read_signed (struct regcache *regcache,
121 int regnum, LONGEST *val);
122 extern enum register_status
123 regcache_cooked_read_unsigned (struct regcache *regcache,
124 int regnum, ULONGEST *val);
125 extern void regcache_cooked_write_signed (struct regcache *regcache,
126 int regnum, LONGEST val);
127 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
128 int regnum, ULONGEST val);
130 /* Partial transfer of a cooked register. These perform read, modify,
131 write style operations. */
133 enum register_status regcache_cooked_read_part (struct regcache *regcache,
134 int regnum, int offset,
135 int len, gdb_byte *buf);
136 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
137 int offset, int len, const gdb_byte *buf);
139 /* Special routines to read/write the PC. */
141 /* For regcache_read_pc see common/common-regcache.h. */
142 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
144 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
145 target. These functions are called by the target in response to a
146 target_fetch_registers() or target_store_registers(). */
148 extern void regcache_raw_supply (struct regcache *regcache,
149 int regnum, const void *buf);
150 extern void regcache_raw_collect (const struct regcache *regcache,
151 int regnum, void *buf);
153 /* Mapping between register numbers and offsets in a buffer, for use
154 in the '*regset' functions below. In an array of
155 'regcache_map_entry' each element is interpreted like follows:
157 - If 'regno' is a register number: Map register 'regno' to the
158 current offset (starting with 0) and increase the current offset
159 by 'size' (or the register's size, if 'size' is zero). Repeat
160 this with consecutive register numbers up to 'regno+count-1'.
162 - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
165 - If count=0: End of the map. */
167 struct regcache_map_entry
174 /* Special value for the 'regno' field in the struct above. */
178 REGCACHE_MAP_SKIP = -1,
181 /* Transfer a set of registers (as described by REGSET) between
182 REGCACHE and BUF. If REGNUM == -1, transfer all registers
183 belonging to the regset, otherwise just the register numbered
184 REGNUM. The REGSET's 'regmap' field must point to an array of
185 'struct regcache_map_entry'.
187 These functions are suitable for the 'regset_supply' and
188 'regset_collect' fields in a regset structure. */
190 extern void regcache_supply_regset (const struct regset *regset,
191 struct regcache *regcache,
192 int regnum, const void *buf,
194 extern void regcache_collect_regset (const struct regset *regset,
195 const struct regcache *regcache,
196 int regnum, void *buf, size_t size);
199 /* The type of a register. This function is slightly more efficient
200 then its gdbarch vector counterpart since it returns a precomputed
201 value stored in a table. */
203 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
206 /* Return the size of register REGNUM. All registers should have only
209 extern int register_size (struct gdbarch *gdbarch, int regnum);
212 /* Save/restore a register cache. The set of registers saved /
213 restored into the DST regcache determined by the save_reggroup /
214 restore_reggroup respectively. COOKED_READ returns zero iff the
215 register's value can't be returned. */
217 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
221 extern void regcache_save (struct regcache *dst,
222 regcache_cooked_read_ftype *cooked_read,
223 void *cooked_read_context);
225 /* Copy/duplicate the contents of a register cache. By default, the
226 operation is pass-through. Writes to DST and reads from SRC will
227 go through to the target. See also regcache_cpy_no_passthrough.
229 regcache_cpy can not have overlapping SRC and DST buffers. */
231 extern struct regcache *regcache_dup (struct regcache *regcache);
232 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
234 extern void registers_changed (void);
235 extern void registers_changed_ptid (ptid_t);
237 #endif /* REGCACHE_H */