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220 lines
8.9 KiB
C
220 lines
8.9 KiB
C
/* Cache and manage the values of registers for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
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2001, 2002 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef REGCACHE_H
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#define REGCACHE_H
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struct regcache;
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struct gdbarch;
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extern struct regcache *current_regcache;
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void regcache_xfree (struct regcache *regcache);
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struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
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struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
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/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
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regcache. */
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void regcache_raw_read (struct regcache *regcache, int rawnum, void *buf);
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void regcache_raw_write (struct regcache *regcache, int rawnum,
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const void *buf);
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extern void regcache_raw_read_signed (struct regcache *regcache,
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int regnum, LONGEST *val);
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extern void regcache_raw_read_unsigned (struct regcache *regcache,
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int regnum, ULONGEST *val);
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extern void regcache_raw_write_signed (struct regcache *regcache,
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int regnum, LONGEST val);
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extern void regcache_raw_write_unsigned (struct regcache *regcache,
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int regnum, ULONGEST val);
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/* Partial transfer of a raw registers. These perform read, modify,
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write style operations. */
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void regcache_raw_read_part (struct regcache *regcache, int regnum,
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int offset, int len, void *buf);
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void regcache_raw_write_part (struct regcache *regcache, int regnum,
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int offset, int len, const void *buf);
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int regcache_valid_p (struct regcache *regcache, int regnum);
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/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
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void regcache_cooked_read (struct regcache *regcache, int rawnum, void *buf);
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void regcache_cooked_write (struct regcache *regcache, int rawnum,
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const void *buf);
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/* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
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for indicating when a ``cooked'' register was constructed from
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invalid or unavailable ``raw'' registers. One fairly easy way of
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adding such a mechanism would be for the cooked functions to return
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a register valid indication. Given the possibility of such a
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change, the extract functions below use a reference parameter,
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rather than a function result. */
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/* Read a register as a signed/unsigned quantity. */
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extern void regcache_cooked_read_signed (struct regcache *regcache,
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int regnum, LONGEST *val);
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extern void regcache_cooked_read_unsigned (struct regcache *regcache,
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int regnum, ULONGEST *val);
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/* Partial transfer of a cooked register. These perform read, modify,
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write style operations. */
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void regcache_cooked_read_part (struct regcache *regcache, int regnum,
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int offset, int len, void *buf);
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void regcache_cooked_write_part (struct regcache *regcache, int regnum,
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int offset, int len, const void *buf);
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/* Transfer a raw register [0..NUM_REGS) between the regcache and the
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target. These functions are called by the target in response to a
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target_fetch_registers() or target_store_registers(). */
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extern void supply_register (int regnum, const void *val);
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extern void regcache_collect (int regnum, void *buf);
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/* The register's ``offset''.
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NOTE: cagney/2002-08-17: The ``struct value'' and expression
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evaluator treat the register cache as a large liner buffer.
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Instead of reading/writing a register using its register number,
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the code read/writes registers by specifying their offset into the
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buffer and a number of bytes. The code also assumes that these
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byte read/writes can cross register boundaries, adjacent registers
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treated as a contiguous set of bytes.
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The below map that model onto the real register cache. New code
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should go out of their way to avoid using these interfaces.
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FIXME: cagney/2002-08-17: The ``struct value'' and expression
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evaluator should be fixed. Instead of using the { offset, length }
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pair to describe a value within one or more registers, the code
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should use a chain of { regnum, offset, len } tripples. */
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extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
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extern void regcache_cooked_read_using_offset_hack (struct regcache *regcache,
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int offset, int len,
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void *buf);
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extern void regcache_cooked_write_using_offset_hack (struct regcache *regcache,
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int offset, int len,
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const void *buf);
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/* The type of a register. This function is slightly more efficient
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then its gdbarch vector counterpart since it returns a precomputed
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value stored in a table.
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NOTE: cagney/2002-08-17: The original macro was called
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REGISTER_VIRTUAL_TYPE. This was because the register could have
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different raw and cooked (nee virtual) representations. The
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CONVERTABLE methods being used to convert between the two
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representations. Current code does not do this. Instead, the
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first [0..NUM_REGS) registers are 1:1 raw:cooked, and the type
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exactly describes the register's representation. Consequently, the
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``virtual'' has been dropped.
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FIXME: cagney/2002-08-17: A number of architectures, including the
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MIPS, are currently broken in this regard. */
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extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
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/* Return the size of the largest register. Used when allocating
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space for an aribtrary register value. */
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extern int max_register_size (struct gdbarch *gdbarch);
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/* DEPRECATED: Character array containing an image of the inferior
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programs' registers for the most recently referenced thread. */
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extern char *registers;
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/* DEPRECATED: Character array containing the current state of each
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register (unavailable<0, invalid=0, valid>0) for the most recently
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referenced thread. */
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extern signed char *register_valid;
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/* Copy/duplicate the contents of a register cache. By default, the
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operation is pass-through. Writes to DST and reads from SRC will
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go through to the target.
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The ``cpy'' functions can not have overlapping SRC and DST buffers.
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``no passthrough'' versions do not go through to the target. They
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only transfer values already in the cache. */
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extern struct regcache *regcache_dup (struct regcache *regcache);
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extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
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extern void regcache_cpy (struct regcache *dest, struct regcache *src);
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extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
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/* NOTE: cagney/2002-11-02: The below have been superseded by the
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regcache_cooked_*() functions found above, and the frame_*()
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functions found in "frame.h". Take care though, often more than a
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simple substitution is required when updating the code. The
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change, as far as practical, should avoid adding references to
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global variables (e.g., current_regcache, current_frame,
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current_gdbarch or selected_frame) and instead refer to the FRAME
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or REGCACHE that has been passed into the containing function as
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parameters. Consequently, the change typically involves modifying
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the containing function so that it takes a FRAME or REGCACHE
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parameter. In the case of an architecture vector method, there
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should already be a non-deprecated variant that is parameterized
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with FRAME or REGCACHE. */
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extern char *deprecated_grub_regcache_for_registers (struct regcache *);
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extern char *deprecated_grub_regcache_for_register_valid (struct regcache *);
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extern void deprecated_read_register_gen (int regnum, char *myaddr);
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extern void deprecated_write_register_gen (int regnum, char *myaddr);
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extern int register_cached (int regnum);
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extern void set_register_cached (int regnum, int state);
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extern void register_changed (int regnum);
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extern void registers_changed (void);
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extern void registers_fetched (void);
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extern void read_register_bytes (int regbyte, char *myaddr, int len);
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extern void write_register_bytes (int regbyte, char *myaddr, int len);
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/* Rename to read_unsigned_register()? */
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extern ULONGEST read_register (int regnum);
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/* Rename to read_unsigned_register_pid()? */
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extern ULONGEST read_register_pid (int regnum, ptid_t ptid);
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extern LONGEST read_signed_register (int regnum);
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extern LONGEST read_signed_register_pid (int regnum, ptid_t ptid);
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extern void write_register (int regnum, LONGEST val);
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extern void write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid);
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#endif /* REGCACHE_H */
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