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/* Cache and manage the values of registers for GDB, the GNU debugger.
Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
2001, 2002 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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef REGCACHE_H
#define REGCACHE_H
struct regcache;
struct gdbarch;
extern struct regcache *current_regcache;
void regcache_xfree (struct regcache *regcache);
struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
regcache. */
void regcache_raw_read (struct regcache *regcache, int rawnum, void *buf);
void regcache_raw_write (struct regcache *regcache, int rawnum,
const void *buf);
extern void regcache_raw_read_signed (struct regcache *regcache,
int regnum, LONGEST *val);
extern void 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 a raw registers. These perform read, modify,
write style operations. */
void regcache_raw_read_part (struct regcache *regcache, int regnum,
int offset, int len, void *buf);
void regcache_raw_write_part (struct regcache *regcache, int regnum,
int offset, int len, const void *buf);
int regcache_valid_p (struct regcache *regcache, int regnum);
/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
void regcache_cooked_read (struct regcache *regcache, int rawnum, void *buf);
void regcache_cooked_write (struct regcache *regcache, int rawnum,
const void *buf);
/* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
for indicating when a ``cooked'' register was constructed from
invalid or unavailable ``raw'' registers. One fairly easy way of
adding such a mechanism would be for the cooked functions to return
a register valid indication. Given the possibility of such a
change, the extract functions below use a reference parameter,
rather than a function result. */
/* Read a register as a signed/unsigned quantity. */
extern void regcache_cooked_read_signed (struct regcache *regcache,
int regnum, LONGEST *val);
extern void regcache_cooked_read_unsigned (struct regcache *regcache,
int regnum, ULONGEST *val);
/* Partial transfer of a cooked register. These perform read, modify,
write style operations. */
void regcache_cooked_read_part (struct regcache *regcache, int regnum,
int offset, int len, void *buf);
void regcache_cooked_write_part (struct regcache *regcache, int regnum,
int offset, int len, const void *buf);
/* 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 supply_register (int regnum, const void *val);
extern void regcache_collect (int regnum, void *buf);
/* The register's ``offset''.
NOTE: cagney/2002-08-17: The ``struct value'' and expression
evaluator treat the register cache as a large liner buffer.
Instead of reading/writing a register using its register number,
the code read/writes registers by specifying their offset into the
buffer and a number of bytes. The code also assumes that these
byte read/writes can cross register boundaries, adjacent registers
treated as a contiguous set of bytes.
The below map that model onto the real register cache. New code
should go out of their way to avoid using these interfaces.
FIXME: cagney/2002-08-17: The ``struct value'' and expression
evaluator should be fixed. Instead of using the { offset, length }
pair to describe a value within one or more registers, the code
should use a chain of { regnum, offset, len } tripples. */
extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
extern void regcache_cooked_read_using_offset_hack (struct regcache *regcache,
int offset, int len,
void *buf);
extern void regcache_cooked_write_using_offset_hack (struct regcache *regcache,
int offset, int len,
const 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.
NOTE: cagney/2002-08-17: The original macro was called
REGISTER_VIRTUAL_TYPE. This was because the register could have
different raw and cooked (nee virtual) representations. The
CONVERTABLE methods being used to convert between the two
representations. Current code does not do this. Instead, the
first [0..NUM_REGS) registers are 1:1 raw:cooked, and the type
exactly describes the register's representation. Consequently, the
``virtual'' has been dropped.
FIXME: cagney/2002-08-17: A number of architectures, including the
MIPS, are currently broken in this regard. */
extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
/* Return the size of the largest register. Used when allocating
space for an aribtrary register value. */
extern int max_register_size (struct gdbarch *gdbarch);
/* DEPRECATED: Character array containing an image of the inferior
programs' registers for the most recently referenced thread. */
extern char *registers;
/* 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 struct regcache *regcache_dup_no_passthrough (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);
/* NOTE: cagney/2002-11-02: The below have been superseded by the
regcache_cooked_*() functions found above, and the frame_*()
functions found in "frame.h". Take care though, often more than a
simple substitution is required when updating the code. The
change, as far as practical, should avoid adding references to
global variables (e.g., current_regcache, current_frame,
current_gdbarch or selected_frame) and instead refer to the FRAME
or REGCACHE that has been passed into the containing function as
parameters. Consequently, the change typically involves modifying
the containing function so that it takes a FRAME or REGCACHE
parameter. In the case of an architecture vector method, there
should already be a non-deprecated variant that is parameterized
with FRAME or REGCACHE. */
extern char *deprecated_grub_regcache_for_registers (struct regcache *);
extern char *deprecated_grub_regcache_for_register_valid (struct regcache *);
extern void deprecated_read_register_gen (int regnum, char *myaddr);
extern void deprecated_write_register_gen (int regnum, char *myaddr);
/* Character array containing the current state of each register
(unavailable<0, invalid=0, valid>0) for the most recently
referenced thread. This global is often found in close proximity
to code that is directly manipulating the deprecated_registers[]
array. In such cases, it should be possible to replace the lot
with a call to supply_register(). If you find yourself in dire
straits, still needing access to the cache status bit, the
regcache_valid_p() and set_register_cached() functions are
available. */
extern signed char *deprecated_register_valid;
extern int register_cached (int regnum);
extern void set_register_cached (int regnum, int state);
extern void register_changed (int regnum);
extern void registers_changed (void);
extern void registers_fetched (void);
extern void read_register_bytes (int regbyte, char *myaddr, int len);
extern void write_register_bytes (int regbyte, char *myaddr, int len);
/* Rename to read_unsigned_register()? */
extern ULONGEST read_register (int regnum);
/* Rename to read_unsigned_register_pid()? */
extern ULONGEST read_register_pid (int regnum, ptid_t ptid);
extern LONGEST read_signed_register (int regnum);
extern LONGEST read_signed_register_pid (int regnum, ptid_t ptid);
extern void write_register (int regnum, LONGEST val);
extern void write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid);
#endif /* REGCACHE_H */
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