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/* Cache and manage the values of registers for GDB, the GNU debugger.
Copyright (C) 1986-2013 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef REGCACHE_H
#define REGCACHE_H
struct regcache;
struct gdbarch;
struct address_space;
extern struct regcache *get_current_regcache (void);
extern struct regcache *get_thread_regcache (ptid_t ptid);
extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
struct gdbarch *,
struct address_space *);
void regcache_xfree (struct regcache *regcache);
struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
struct regcache *regcache_xmalloc (struct gdbarch *gdbarch,
struct address_space *aspace);
/* Return REGCACHE's architecture. */
extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
/* Return REGCACHE's address space. */
extern struct address_space *get_regcache_aspace (const struct regcache *);
enum register_status
{
/* The register value is not in the cache, and we don't know yet
whether it's available in the target (or traceframe). */
REG_UNKNOWN = 0,
/* The register value is valid and cached. */
REG_VALID = 1,
/* The register value is unavailable. E.g., we're inspecting a
traceframe, and this register wasn't collected. Note that this
is different a different "unavailable" from saying the register
does not exist in the target's architecture --- in that case,
the target should have given us a target description that does
not include the register in the first place. */
REG_UNAVAILABLE = -1
};
enum register_status regcache_register_status (const struct regcache *regcache,
int regnum);
/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
regcache. The read variants return the status of the register. */
enum register_status regcache_raw_read (struct regcache *regcache,
int rawnum, gdb_byte *buf);
void regcache_raw_write (struct regcache *regcache, int rawnum,
const gdb_byte *buf);
extern enum register_status
regcache_raw_read_signed (struct regcache *regcache,
int regnum, LONGEST *val);
extern enum register_status
regcache_raw_read_unsigned (struct regcache *regcache,
int regnum, ULONGEST *val);
extern void regcache_raw_write_signed (struct regcache *regcache,
int regnum, LONGEST val);
extern void regcache_raw_write_unsigned (struct regcache *regcache,
int regnum, ULONGEST val);
/* Partial transfer of raw registers. These perform read, modify,
write style operations. The read variant returns the status of the
register. */
extern enum register_status
regcache_raw_read_part (struct regcache *regcache, int regnum,
int offset, int len, gdb_byte *buf);
void regcache_raw_write_part (struct regcache *regcache, int regnum,
int offset, int len, const gdb_byte *buf);
void regcache_invalidate (struct regcache *regcache, int regnum);
/* Transfer of pseudo-registers. The read variants return a register
status, as an indication of when a ``cooked'' register was
constructed from valid, invalid or unavailable ``raw''
registers. */
/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
enum register_status regcache_cooked_read (struct regcache *regcache,
int rawnum, gdb_byte *buf);
void regcache_cooked_write (struct regcache *regcache, int rawnum,
const gdb_byte *buf);
/* Read register REGNUM from REGCACHE and return a new value. This
will call mark_value_bytes_unavailable as appropriate. */
struct value *regcache_cooked_read_value (struct regcache *regcache,
int regnum);
/* Read a register as a signed/unsigned quantity. */
extern enum register_status
regcache_cooked_read_signed (struct regcache *regcache,
int regnum, LONGEST *val);
extern enum register_status
regcache_cooked_read_unsigned (struct regcache *regcache,
int regnum, ULONGEST *val);
extern void regcache_cooked_write_signed (struct regcache *regcache,
int regnum, LONGEST val);
extern void regcache_cooked_write_unsigned (struct regcache *regcache,
int regnum, ULONGEST val);
/* Partial transfer of a cooked register. These perform read, modify,
write style operations. */
enum register_status regcache_cooked_read_part (struct regcache *regcache,
int regnum, int offset,
int len, gdb_byte *buf);
void regcache_cooked_write_part (struct regcache *regcache, int regnum,
int offset, int len, const gdb_byte *buf);
/* Special routines to read/write the PC. */
extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
/* Transfer a raw register [0..NUM_REGS) between the regcache and the
target. These functions are called by the target in response to a
target_fetch_registers() or target_store_registers(). */
extern void regcache_raw_supply (struct regcache *regcache,
int regnum, const void *buf);
extern void regcache_raw_collect (const struct regcache *regcache,
int regnum, void *buf);
/* The type of a register. This function is slightly more efficient
then its gdbarch vector counterpart since it returns a precomputed
value stored in a table. */
extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
/* Return the size of register REGNUM. All registers should have only
one size. */
extern int register_size (struct gdbarch *gdbarch, int regnum);
/* Save/restore a register cache. The set of registers saved /
restored into the DST regcache determined by the save_reggroup /
restore_reggroup respectively. COOKED_READ returns zero iff the
register's value can't be returned. */
typedef enum register_status (regcache_cooked_read_ftype) (void *src,
int regnum,
gdb_byte *buf);
extern void regcache_save (struct regcache *dst,
regcache_cooked_read_ftype *cooked_read,
void *cooked_read_context);
/* Copy/duplicate the contents of a register cache. By default, the
operation is pass-through. Writes to DST and reads from SRC will
go through to the target.
The ``cpy'' functions can not have overlapping SRC and DST buffers.
``no passthrough'' versions do not go through to the target. They
only transfer values already in the cache. */
extern struct regcache *regcache_dup (struct regcache *regcache);
extern void regcache_cpy (struct regcache *dest, struct regcache *src);
extern void regcache_cpy_no_passthrough (struct regcache *dest,
struct regcache *src);
extern void registers_changed (void);
extern void registers_changed_ptid (ptid_t);
#endif /* REGCACHE_H */
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