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cfb7e58b48
Nowadays, regcache_cpy is used where src is read-only and dst is not read-only, so the regcache_cpy can be simplified to handle this case only. As a result, regcache::cpy_no_passthrough, which is about two read-only regcache copy, is no longer used, remove it as well. gdb: 2017-07-18 Yao Qi <yao.qi@linaro.org> * regcache.c (regcache_cpy): Simplify it. (regcache::cpy_no_passthrough): Remove it. * regcache.h (cpy_no_passthrough): Remove it. (regcache_dup, regcache_cpy): Update comments.
428 lines
14 KiB
C++
428 lines
14 KiB
C++
/* Cache and manage the values of registers for GDB, the GNU debugger.
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Copyright (C) 1986-2017 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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#include <forward_list>
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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 ptid. */
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extern ptid_t regcache_get_ptid (const struct regcache *regcache);
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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 regcache_register_status (const struct regcache *regcache,
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int regnum);
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/* Make certain that the register REGNUM in REGCACHE is up-to-date. */
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void regcache_raw_update (struct regcache *regcache, 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 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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/* Return the register's value in signed or throw if it's not
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available. */
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extern LONGEST regcache_raw_get_signed (struct regcache *regcache,
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int regnum);
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/* Set a raw register's value in the regcache's buffer. Unlike
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regcache_raw_write, this is not write-through. The intention is
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allowing to change the buffer contents of a read-only regcache
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allocated with regcache_xmalloc. */
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extern void regcache_raw_set_cached_value
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(struct regcache *regcache, int regnum, const gdb_byte *buf);
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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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enum regcache_dump_what
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{
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regcache_dump_none, regcache_dump_raw,
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regcache_dump_cooked, regcache_dump_groups,
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regcache_dump_remote
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};
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/* A (register_number, register_value) pair. */
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typedef struct cached_reg
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{
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int num;
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gdb_byte *data;
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} cached_reg_t;
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/* The register cache for storing raw register values. */
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class regcache
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{
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public:
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regcache (gdbarch *gdbarch, address_space *aspace_)
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: regcache (gdbarch, aspace_, true)
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{}
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struct readonly_t {};
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static constexpr readonly_t readonly {};
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/* Create a readonly regcache from a non-readonly regcache. */
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regcache (readonly_t, const regcache &src);
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regcache (const regcache &) = delete;
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void operator= (const regcache &) = delete;
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/* class regcache is only extended in unit test, so only mark it
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virtual when selftest is enabled. */
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#if GDB_SELF_TEST
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virtual
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#endif
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~regcache ()
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{
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xfree (m_registers);
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xfree (m_register_status);
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}
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gdbarch *arch () const;
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address_space *aspace () const
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{
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return m_aspace;
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}
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void save (regcache_cooked_read_ftype *cooked_read, void *src);
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enum register_status cooked_read (int regnum, gdb_byte *buf);
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void cooked_write (int regnum, const gdb_byte *buf);
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enum register_status raw_read (int regnum, gdb_byte *buf);
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/* class regcache is only extended in unit test, so only mark it
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virtual when selftest is enabled. */
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#if GDB_SELF_TEST
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virtual
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#endif
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void raw_write (int regnum, const gdb_byte *buf);
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template<typename T, typename = RequireLongest<T>>
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enum register_status raw_read (int regnum, T *val);
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template<typename T, typename = RequireLongest<T>>
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void raw_write (int regnum, T val);
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struct value *cooked_read_value (int regnum);
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template<typename T, typename = RequireLongest<T>>
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enum register_status cooked_read (int regnum, T *val);
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template<typename T, typename = RequireLongest<T>>
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void cooked_write (int regnum, T val);
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void raw_update (int regnum);
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void raw_collect (int regnum, void *buf) const;
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void raw_collect_integer (int regnum, gdb_byte *addr, int addr_len,
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bool is_signed) const;
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void raw_supply (int regnum, const void *buf);
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void raw_supply_integer (int regnum, const gdb_byte *addr, int addr_len,
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bool is_signed);
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void raw_supply_zeroed (int regnum);
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enum register_status get_register_status (int regnum) const;
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void raw_set_cached_value (int regnum, const gdb_byte *buf);
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void invalidate (int regnum);
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enum register_status raw_read_part (int regnum, int offset, int len,
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gdb_byte *buf);
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void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
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enum register_status cooked_read_part (int regnum, int offset, int len,
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gdb_byte *buf);
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void cooked_write_part (int regnum, int offset, int len,
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const gdb_byte *buf);
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void supply_regset (const struct regset *regset,
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int regnum, const void *buf, size_t size);
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void collect_regset (const struct regset *regset, int regnum,
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void *buf, size_t size) const;
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void dump (ui_file *file, enum regcache_dump_what what_to_dump);
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ptid_t ptid () const
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{
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return m_ptid;
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}
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void set_ptid (const ptid_t ptid)
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{
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this->m_ptid = ptid;
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}
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/* Dump the contents of a register from the register cache to the target
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debug. */
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void debug_print_register (const char *func, int regno);
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static void regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid);
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protected:
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regcache (gdbarch *gdbarch, address_space *aspace_, bool readonly_p_);
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static std::forward_list<regcache *> current_regcache;
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private:
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gdb_byte *register_buffer (int regnum) const;
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void restore (struct regcache *src);
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enum register_status xfer_part (int regnum, int offset, int len, void *in,
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const void *out,
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decltype (regcache_raw_read) read,
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decltype (regcache_raw_write) write);
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void transfer_regset (const struct regset *regset,
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struct regcache *out_regcache,
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int regnum, const void *in_buf,
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void *out_buf, size_t size) const;
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struct regcache_descr *m_descr;
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/* The address space of this register cache (for registers where it
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makes sense, like PC or SP). */
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struct address_space *m_aspace;
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/* The register buffers. A read-only register cache can hold the
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full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write
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register cache can only hold [0 .. gdbarch_num_regs). */
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gdb_byte *m_registers;
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/* Register cache status. */
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signed char *m_register_status;
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/* Is this a read-only cache? A read-only cache is used for saving
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the target's register state (e.g, across an inferior function
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call or just before forcing a function return). A read-only
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cache can only be updated via the methods regcache_dup() and
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regcache_cpy(). The actual contents are determined by the
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reggroup_save and reggroup_restore methods. */
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bool m_readonly_p;
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/* If this is a read-write cache, which thread's registers is
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it connected to? */
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ptid_t m_ptid;
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friend struct regcache *
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get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
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struct address_space *aspace);
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friend void
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registers_changed_ptid (ptid_t ptid);
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friend void
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regcache_cpy (struct regcache *dst, struct regcache *src);
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};
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/* Duplicate the contents of a register cache to a read-only register
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cache. The operation is pass-through. */
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extern struct regcache *regcache_dup (struct regcache *regcache);
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/* Writes to DEST will go through to the target. SRC is a read-only
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register cache. */
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extern void regcache_cpy (struct regcache *dest, 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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