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243 lines
8.8 KiB
C
243 lines
8.8 KiB
C
/* Cache and manage the values of registers for GDB, the GNU debugger.
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Copyright (C) 1986-2015 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 3 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, see <http://www.gnu.org/licenses/>. */
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#ifndef REGCACHE_H
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#define REGCACHE_H
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#include "common-regcache.h"
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struct regcache;
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struct regset;
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struct gdbarch;
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struct address_space;
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extern struct regcache *get_current_regcache (void);
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extern struct regcache *get_thread_regcache (ptid_t ptid);
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extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
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extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
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struct gdbarch *,
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struct address_space *);
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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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struct address_space *aspace);
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/* Return REGCACHE's architecture. */
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extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
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/* Return REGCACHE's address space. */
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extern struct address_space *get_regcache_aspace (const struct regcache *);
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enum register_status
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{
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/* The register value is not in the cache, and we don't know yet
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whether it's available in the target (or traceframe). */
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REG_UNKNOWN = 0,
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/* The register value is valid and cached. */
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REG_VALID = 1,
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/* The register value is unavailable. E.g., we're inspecting a
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traceframe, and this register wasn't collected. Note that this
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is different a different "unavailable" from saying the register
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does not exist in the target's architecture --- in that case,
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the target should have given us a target description that does
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not include the register in the first place. */
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REG_UNAVAILABLE = -1
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};
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enum register_status regcache_register_status (const struct regcache *regcache,
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int regnum);
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/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
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regcache. The read variants return the status of the register. */
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enum register_status regcache_raw_read (struct regcache *regcache,
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int rawnum, gdb_byte *buf);
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void regcache_raw_write (struct regcache *regcache, int rawnum,
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const gdb_byte *buf);
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extern enum register_status
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regcache_raw_read_signed (struct regcache *regcache,
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int regnum, LONGEST *val);
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extern enum register_status
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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 raw registers. These perform read, modify,
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write style operations. The read variant returns the status of the
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register. */
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extern enum register_status
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regcache_raw_read_part (struct regcache *regcache, int regnum,
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int offset, int len, gdb_byte *buf);
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void regcache_raw_write_part (struct regcache *regcache, int regnum,
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int offset, int len, const gdb_byte *buf);
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void regcache_invalidate (struct regcache *regcache, int regnum);
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/* Transfer of pseudo-registers. The read variants return a register
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status, as an indication of when a ``cooked'' register was
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constructed from valid, invalid or unavailable ``raw''
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registers. */
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/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
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enum register_status regcache_cooked_read (struct regcache *regcache,
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int rawnum, gdb_byte *buf);
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void regcache_cooked_write (struct regcache *regcache, int rawnum,
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const gdb_byte *buf);
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/* Read register REGNUM from REGCACHE and return a new value. This
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will call mark_value_bytes_unavailable as appropriate. */
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struct value *regcache_cooked_read_value (struct regcache *regcache,
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int regnum);
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/* Read a register as a signed/unsigned quantity. */
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extern enum register_status
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regcache_cooked_read_signed (struct regcache *regcache,
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int regnum, LONGEST *val);
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extern enum register_status
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regcache_cooked_read_unsigned (struct regcache *regcache,
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int regnum, ULONGEST *val);
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extern void regcache_cooked_write_signed (struct regcache *regcache,
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int regnum, LONGEST val);
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extern void regcache_cooked_write_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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enum register_status regcache_cooked_read_part (struct regcache *regcache,
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int regnum, int offset,
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int len, gdb_byte *buf);
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void regcache_cooked_write_part (struct regcache *regcache, int regnum,
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int offset, int len, const gdb_byte *buf);
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/* Special routines to read/write the PC. */
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/* For regcache_read_pc see common/common-regcache.h. */
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extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
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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 regcache_raw_supply (struct regcache *regcache,
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int regnum, const void *buf);
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extern void regcache_raw_collect (const struct regcache *regcache,
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int regnum, void *buf);
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/* Mapping between register numbers and offsets in a buffer, for use
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in the '*regset' functions below. In an array of
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'regcache_map_entry' each element is interpreted like follows:
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- If 'regno' is a register number: Map register 'regno' to the
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current offset (starting with 0) and increase the current offset
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by 'size' (or the register's size, if 'size' is zero). Repeat
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this with consecutive register numbers up to 'regno+count-1'.
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- If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
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offset.
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- If count=0: End of the map. */
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struct regcache_map_entry
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{
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int count;
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int regno;
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int size;
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};
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/* Special value for the 'regno' field in the struct above. */
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enum
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{
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REGCACHE_MAP_SKIP = -1,
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};
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/* Transfer a set of registers (as described by REGSET) between
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REGCACHE and BUF. If REGNUM == -1, transfer all registers
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belonging to the regset, otherwise just the register numbered
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REGNUM. The REGSET's 'regmap' field must point to an array of
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'struct regcache_map_entry'.
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These functions are suitable for the 'regset_supply' and
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'regset_collect' fields in a regset structure. */
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extern void regcache_supply_regset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *buf,
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size_t size);
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extern void regcache_collect_regset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *buf, size_t size);
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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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extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
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/* Return the size of register REGNUM. All registers should have only
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one size. */
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extern int register_size (struct gdbarch *gdbarch, int regnum);
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/* Save/restore a register cache. The set of registers saved /
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restored into the DST regcache determined by the save_reggroup /
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restore_reggroup respectively. COOKED_READ returns zero iff the
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register's value can't be returned. */
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typedef enum register_status (regcache_cooked_read_ftype) (void *src,
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int regnum,
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gdb_byte *buf);
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extern void regcache_save (struct regcache *dst,
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regcache_cooked_read_ftype *cooked_read,
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void *cooked_read_context);
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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 void regcache_cpy (struct regcache *dest, struct regcache *src);
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extern void regcache_cpy_no_passthrough (struct regcache *dest,
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struct regcache *src);
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extern void registers_changed (void);
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extern void registers_changed_ptid (ptid_t);
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#endif /* REGCACHE_H */
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