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0c76e06d5c
sve_regmap cannot be global static as the size is dependant on the current vector length. gdb/ * aarch64-linux-tdep.c (aarch64_linux_supply_sve_regset): New function. (aarch64_linux_collect_sve_regset): Likewise. (aarch64_linux_iterate_over_regset_sections): Check for SVE. * regcache.h (regcache_map_entry_size): New function.
462 lines
14 KiB
C++
462 lines
14 KiB
C++
/* Cache and manage the values of registers for GDB, the GNU debugger.
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Copyright (C) 1986-2018 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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/* Get the regcache of THREAD. */
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extern struct regcache *get_thread_regcache (thread_info *thread);
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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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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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/* 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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/* 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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/* 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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/* Calculate and return the total size of all the registers in a
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regcache_map_entry. */
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static inline int
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regcache_map_entry_size (const struct regcache_map_entry *map)
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{
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int size = 0;
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for (int i = 0; map[i].count != 0; i++)
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size += (map[i].count * map[i].size);
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return size;
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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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typedef gdb::function_view<register_status (int regnum, gdb_byte *buf)>
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register_read_ftype;
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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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/* Buffer of registers. */
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class reg_buffer : public reg_buffer_common
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{
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public:
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reg_buffer (gdbarch *gdbarch, bool has_pseudo);
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DISABLE_COPY_AND_ASSIGN (reg_buffer);
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/* Return regcache's architecture. */
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gdbarch *arch () const;
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/* See common/common-regcache.h. */
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enum register_status get_register_status (int regnum) const override;
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/* See common/common-regcache.h. */
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void raw_collect (int regnum, void *buf) const override;
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/* Collect register REGNUM from REGCACHE. Store collected value as an integer
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at address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED.
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If ADDR_LEN is greater than the register size, then the integer will be
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sign or zero extended. If ADDR_LEN is smaller than the register size, then
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the most significant bytes of the integer will be truncated. */
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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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/* Collect register REGNUM from REGCACHE, starting at OFFSET in register,
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reading only LEN. */
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void raw_collect_part (int regnum, int offset, int len, gdb_byte *out) const;
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/* See common/common-regcache.h. */
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void raw_supply (int regnum, const void *buf) override;
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void raw_supply (int regnum, const reg_buffer &src)
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{
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raw_supply (regnum, src.register_buffer (regnum));
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}
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/* Supply register REGNUM to REGCACHE. Value to supply is an integer stored
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at address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED.
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If the register size is greater than ADDR_LEN, then the integer will be
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sign or zero extended. If the register size is smaller than the integer,
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then the most significant bytes of the integer will be truncated. */
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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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/* Supply register REGNUM with zeroed value to REGCACHE. This is not the same
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as calling raw_supply with NULL (which will set the state to
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unavailable). */
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void raw_supply_zeroed (int regnum);
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/* Supply register REGNUM to REGCACHE, starting at OFFSET in register, writing
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only LEN, without editing the rest of the register. */
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void raw_supply_part (int regnum, int offset, int len, const gdb_byte *in);
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void invalidate (int regnum);
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virtual ~reg_buffer () = default;
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/* See common/common-regcache.h. */
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bool raw_compare (int regnum, const void *buf, int offset) const override;
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protected:
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/* Assert on the range of REGNUM. */
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void assert_regnum (int regnum) const;
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int num_raw_registers () const;
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gdb_byte *register_buffer (int regnum) const;
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/* Save a register cache. The set of registers saved into the
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regcache determined by the save_reggroup. COOKED_READ returns
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zero iff the register's value can't be returned. */
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void save (register_read_ftype cooked_read);
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struct regcache_descr *m_descr;
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bool m_has_pseudo;
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/* The register buffers. */
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std::unique_ptr<gdb_byte[]> m_registers;
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/* Register cache status. */
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std::unique_ptr<register_status[]> m_register_status;
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friend class regcache;
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friend class detached_regcache;
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};
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/* An abstract class which only has methods doing read. */
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class readable_regcache : public reg_buffer
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{
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public:
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readable_regcache (gdbarch *gdbarch, bool has_pseudo)
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: reg_buffer (gdbarch, has_pseudo)
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{}
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/* Transfer a raw register [0..NUM_REGS) from core-gdb to this regcache,
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return its value in *BUF and return its availability status. */
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enum register_status raw_read (int regnum, 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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/* Partial transfer of raw registers. Return the status of the register. */
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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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/* Make certain that the register REGNUM is up-to-date. */
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virtual void raw_update (int regnum) = 0;
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/* Transfer a raw register [0..NUM_REGS+NUM_PSEUDO_REGS) from core-gdb to
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this regcache, return its value in *BUF and return its availability status. */
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enum register_status cooked_read (int regnum, gdb_byte *buf);
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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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/* Partial transfer of a cooked register. */
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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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/* Read register REGNUM from the 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 *cooked_read_value (int regnum);
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protected:
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/* Perform a partial register transfer using a read, modify, write
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operation. Will fail if register is currently invalid. */
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enum register_status read_part (int regnum, int offset, int len,
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gdb_byte *out, bool is_raw);
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};
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/* Buffer of registers, can be read and written. */
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class detached_regcache : public readable_regcache
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{
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public:
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detached_regcache (gdbarch *gdbarch, bool has_pseudo)
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: readable_regcache (gdbarch, has_pseudo)
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{}
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void raw_update (int regnum) override
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{}
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DISABLE_COPY_AND_ASSIGN (detached_regcache);
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};
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class readonly_detached_regcache;
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/* The register cache for storing raw register values. */
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class regcache : public detached_regcache
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{
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public:
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DISABLE_COPY_AND_ASSIGN (regcache);
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/* Return REGCACHE's address space. */
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const address_space *aspace () const
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{
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return m_aspace;
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}
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/* Restore 'this' regcache. The set of registers restored into
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the regcache determined by the restore_reggroup.
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Writes to regcache will go through to the target. SRC is a
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read-only register cache. */
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void restore (readonly_detached_regcache *src);
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/* Update the value of raw register REGNUM (in the range [0..NUM_REGS)) and
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transfer its value to core-gdb. */
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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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void raw_write (int regnum, T val);
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/* Transfer of pseudo-registers. */
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void cooked_write (int regnum, const gdb_byte *buf);
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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) override;
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/* Partial transfer of raw registers. Perform read, modify, write style
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operations. */
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void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
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/* Partial transfer of a cooked register. Perform read, modify, write style
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operations. */
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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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/* Return REGCACHE's ptid. */
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ptid_t ptid () const
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{
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gdb_assert (m_ptid != minus_one_ptid);
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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, const address_space *aspace_);
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static std::forward_list<regcache *> current_regcache;
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private:
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/* Helper function for transfer_regset. Copies across a single register. */
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void transfer_regset_register (struct regcache *out_regcache, int regnum,
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const gdb_byte *in_buf, gdb_byte *out_buf,
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int slot_size, int offs) const;
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/* Transfer a single or all registers belonging to a certain register
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set to or from a buffer. This is the main worker function for
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regcache_supply_regset and regcache_collect_regset. */
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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 gdb_byte *in_buf,
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gdb_byte *out_buf, size_t size) const;
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/* Perform a partial register transfer using a read, modify, write
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operation. */
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enum register_status write_part (int regnum, int offset, int len,
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const gdb_byte *in, bool is_raw);
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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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const address_space * const m_aspace;
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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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};
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class readonly_detached_regcache : public readable_regcache
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{
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public:
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readonly_detached_regcache (regcache &src);
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/* Create a readonly regcache by getting contents from COOKED_READ. */
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readonly_detached_regcache (gdbarch *gdbarch, register_read_ftype cooked_read)
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: readable_regcache (gdbarch, true)
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{
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save (cooked_read);
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}
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DISABLE_COPY_AND_ASSIGN (readonly_detached_regcache);
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void raw_update (int regnum) override
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{}
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};
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extern void registers_changed (void);
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extern void registers_changed_ptid (ptid_t);
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/* Indicate that registers of THREAD may have changed, so invalidate
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the cache. */
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extern void registers_changed_thread (thread_info *thread);
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/* An abstract base class for register dump. */
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class register_dump
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{
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public:
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void dump (ui_file *file);
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virtual ~register_dump () = default;
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protected:
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register_dump (gdbarch *arch)
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: m_gdbarch (arch)
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{}
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/* Dump the register REGNUM contents. If REGNUM is -1, print the
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header. */
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virtual void dump_reg (ui_file *file, int regnum) = 0;
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gdbarch *m_gdbarch;
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};
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#endif /* REGCACHE_H */
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