/* Cache and manage the values of registers for GDB, the GNU debugger.
- Copyright (C) 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001,
- 2002, 2007 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef REGCACHE_H
#define REGCACHE_H
+#include "gdbsupport/common-regcache.h"
+#include "gdbsupport/function-view.h"
+#include <forward_list>
+
struct regcache;
+struct regset;
struct gdbarch;
+struct address_space;
+class thread_info;
extern struct regcache *get_current_regcache (void);
extern struct regcache *get_thread_regcache (ptid_t ptid);
-void regcache_xfree (struct regcache *regcache);
-struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
-struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
-
-/* Return REGCACHE's architecture. */
+/* Get the regcache of THREAD. */
+extern struct regcache *get_thread_regcache (thread_info *thread);
-extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
+extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
+extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
+ struct gdbarch *,
+ struct address_space *);
-/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
- regcache. */
+extern enum register_status
+ regcache_raw_read_signed (struct regcache *regcache,
+ int regnum, LONGEST *val);
-void regcache_raw_read (struct regcache *regcache, int rawnum, gdb_byte *buf);
-void regcache_raw_write (struct regcache *regcache, int rawnum,
- const gdb_byte *buf);
-extern void regcache_raw_read_signed (struct regcache *regcache,
- int regnum, LONGEST *val);
-extern void regcache_raw_read_unsigned (struct regcache *regcache,
- int regnum, ULONGEST *val);
extern void regcache_raw_write_signed (struct regcache *regcache,
int regnum, LONGEST val);
extern void regcache_raw_write_unsigned (struct regcache *regcache,
int regnum, ULONGEST val);
-/* Partial transfer of a raw registers. These perform read, modify,
- write style operations. */
-
-void regcache_raw_read_part (struct regcache *regcache, int regnum,
- int offset, int len, gdb_byte *buf);
-void regcache_raw_write_part (struct regcache *regcache, int regnum,
- int offset, int len, const gdb_byte *buf);
-
-int regcache_valid_p (const struct regcache *regcache, int regnum);
-
-void regcache_invalidate (struct regcache *regcache, int regnum);
-
-/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
-void regcache_cooked_read (struct regcache *regcache, int rawnum,
- gdb_byte *buf);
-void regcache_cooked_write (struct regcache *regcache, int rawnum,
- const gdb_byte *buf);
+/* Return the register's value in signed or throw if it's not
+ available. */
-/* NOTE: cagney/2002-08-13: At present GDB has no reliable mechanism
- for indicating when a ``cooked'' register was constructed from
- invalid or unavailable ``raw'' registers. One fairly easy way of
- adding such a mechanism would be for the cooked functions to return
- a register valid indication. Given the possibility of such a
- change, the extract functions below use a reference parameter,
- rather than a function result. */
+extern LONGEST regcache_raw_get_signed (struct regcache *regcache,
+ int regnum);
/* Read a register as a signed/unsigned quantity. */
-extern void regcache_cooked_read_signed (struct regcache *regcache,
- int regnum, LONGEST *val);
-extern void regcache_cooked_read_unsigned (struct regcache *regcache,
- int regnum, ULONGEST *val);
+extern enum register_status
+ regcache_cooked_read_signed (struct regcache *regcache,
+ int regnum, LONGEST *val);
+extern enum register_status
+ regcache_cooked_read_unsigned (struct regcache *regcache,
+ int regnum, ULONGEST *val);
extern void regcache_cooked_write_signed (struct regcache *regcache,
int regnum, LONGEST val);
extern void regcache_cooked_write_unsigned (struct regcache *regcache,
int regnum, ULONGEST val);
-/* Partial transfer of a cooked register. These perform read, modify,
- write style operations. */
-
-void regcache_cooked_read_part (struct regcache *regcache, int regnum,
- int offset, int len, gdb_byte *buf);
-void regcache_cooked_write_part (struct regcache *regcache, int regnum,
- int offset, int len, const gdb_byte *buf);
-
-/* Transfer a raw register [0..NUM_REGS) between the regcache and the
- target. These functions are called by the target in response to a
- target_fetch_registers() or target_store_registers(). */
-
-extern void regcache_raw_supply (struct regcache *regcache,
- int regnum, const void *buf);
-extern void regcache_raw_collect (const struct regcache *regcache,
- int regnum, void *buf);
-
-
-/* The register's ``offset''.
-
- FIXME: cagney/2002-11-07: The frame_register() function, when
- specifying the real location of a register, does so using that
- registers offset in the register cache. That offset is then used
- by valops.c to determine the location of the register. The code
- should instead use the register's number and a location expression
- to describe a value spread across multiple registers or memory. */
-
-extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
+/* Special routines to read/write the PC. */
+
+/* For regcache_read_pc see gdbsupport/common-regcache.h. */
+extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
+
+/* Mapping between register numbers and offsets in a buffer, for use
+ in the '*regset' functions below and with traditional frame caches.
+ In an array of 'regcache_map_entry' each element is interpreted
+ like follows:
+
+ - If 'regno' is a register number: Map register 'regno' to the
+ current offset (starting with 0) and increase the current offset
+ by 'size' (or the register's size, if 'size' is zero). Repeat
+ this with consecutive register numbers up to 'regno+count-1'.
+
+ For each described register, if 'size' is larger than the
+ register's size, the register's value is assumed to be stored in
+ the first N (where N is the register size) bytes at the current
+ offset. The remaining 'size' - N bytes are filled with zeroes by
+ 'regcache_collect_regset' and ignored by other consumers.
+
+ If 'size' is smaller than the register's size, only the first
+ 'size' bytes of a register's value are assumed to be stored at
+ the current offset. 'regcache_collect_regset' copies the first
+ 'size' bytes of a register's value to the output buffer.
+ 'regcache_supply_regset' copies the bytes from the input buffer
+ into the first 'size' bytes of the register's value leaving the
+ remaining bytes of the register's value unchanged. Frame caches
+ read the 'size' bytes from the stack frame and zero extend them
+ to generate the register's value.
+
+ - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
+ offset.
+
+ - If count=0: End of the map. */
+
+struct regcache_map_entry
+{
+ int count;
+ int regno;
+ int size;
+};
+
+/* Special value for the 'regno' field in the struct above. */
+
+enum
+ {
+ REGCACHE_MAP_SKIP = -1,
+ };
+
+/* Calculate and return the total size of all the registers in a
+ regcache_map_entry. */
+
+static inline int
+regcache_map_entry_size (const struct regcache_map_entry *map)
+{
+ int size = 0;
+ for (int i = 0; map[i].count != 0; i++)
+ size += (map[i].count * map[i].size);
+ return size;
+}
+
+/* Transfer a set of registers (as described by REGSET) between
+ REGCACHE and BUF. If REGNUM == -1, transfer all registers
+ belonging to the regset, otherwise just the register numbered
+ REGNUM. The REGSET's 'regmap' field must point to an array of
+ 'struct regcache_map_entry'.
+
+ These functions are suitable for the 'regset_supply' and
+ 'regset_collect' fields in a regset structure. */
+
+extern void regcache_supply_regset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *buf,
+ size_t size);
+extern void regcache_collect_regset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *buf, size_t size);
/* The type of a register. This function is slightly more efficient
extern int register_size (struct gdbarch *gdbarch, int regnum);
+typedef gdb::function_view<register_status (int regnum, gdb_byte *buf)>
+ register_read_ftype;
+
+/* A (register_number, register_value) pair. */
+
+typedef struct cached_reg
+{
+ int num;
+ gdb_byte *data;
+} cached_reg_t;
+
+/* Buffer of registers. */
+
+class reg_buffer : public reg_buffer_common
+{
+public:
+ reg_buffer (gdbarch *gdbarch, bool has_pseudo);
+
+ DISABLE_COPY_AND_ASSIGN (reg_buffer);
+
+ /* Return regcache's architecture. */
+ gdbarch *arch () const;
+
+ /* See gdbsupport/common-regcache.h. */
+ enum register_status get_register_status (int regnum) const override;
+
+ /* See gdbsupport/common-regcache.h. */
+ void raw_collect (int regnum, void *buf) const override;
+
+ /* Collect register REGNUM from REGCACHE. Store collected value as an integer
+ at address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED.
+ If ADDR_LEN is greater than the register size, then the integer will be
+ sign or zero extended. If ADDR_LEN is smaller than the register size, then
+ the most significant bytes of the integer will be truncated. */
+ void raw_collect_integer (int regnum, gdb_byte *addr, int addr_len,
+ bool is_signed) const;
+
+ /* Collect register REGNUM from REGCACHE, starting at OFFSET in register,
+ reading only LEN. */
+ void raw_collect_part (int regnum, int offset, int len, gdb_byte *out) const;
+
+ /* See gdbsupport/common-regcache.h. */
+ void raw_supply (int regnum, const void *buf) override;
+
+ void raw_supply (int regnum, const reg_buffer &src)
+ {
+ raw_supply (regnum, src.register_buffer (regnum));
+ }
+
+ /* Supply register REGNUM to REGCACHE. Value to supply is an integer stored
+ at address ADDR, in target endian, with length ADDR_LEN and sign IS_SIGNED.
+ If the register size is greater than ADDR_LEN, then the integer will be
+ sign or zero extended. If the register size is smaller than the integer,
+ then the most significant bytes of the integer will be truncated. */
+ void raw_supply_integer (int regnum, const gdb_byte *addr, int addr_len,
+ bool is_signed);
+
+ /* Supply register REGNUM with zeroed value to REGCACHE. This is not the same
+ as calling raw_supply with NULL (which will set the state to
+ unavailable). */
+ void raw_supply_zeroed (int regnum);
+
+ /* Supply register REGNUM to REGCACHE, starting at OFFSET in register, writing
+ only LEN, without editing the rest of the register. */
+ void raw_supply_part (int regnum, int offset, int len, const gdb_byte *in);
+
+ void invalidate (int regnum);
+
+ virtual ~reg_buffer () = default;
+
+ /* See gdbsupport/common-regcache.h. */
+ bool raw_compare (int regnum, const void *buf, int offset) const override;
+
+protected:
+ /* Assert on the range of REGNUM. */
+ void assert_regnum (int regnum) const;
+
+ int num_raw_registers () const;
+
+ gdb_byte *register_buffer (int regnum) const;
+
+ /* Save a register cache. The set of registers saved into the
+ regcache determined by the save_reggroup. COOKED_READ returns
+ zero iff the register's value can't be returned. */
+ void save (register_read_ftype cooked_read);
+
+ struct regcache_descr *m_descr;
+
+ bool m_has_pseudo;
+ /* The register buffers. */
+ std::unique_ptr<gdb_byte[]> m_registers;
+ /* Register cache status. */
+ std::unique_ptr<register_status[]> m_register_status;
+
+ friend class regcache;
+ friend class detached_regcache;
+};
+
+/* An abstract class which only has methods doing read. */
+
+class readable_regcache : public reg_buffer
+{
+public:
+ readable_regcache (gdbarch *gdbarch, bool has_pseudo)
+ : reg_buffer (gdbarch, has_pseudo)
+ {}
+
+ /* Transfer a raw register [0..NUM_REGS) from core-gdb to this regcache,
+ return its value in *BUF and return its availability status. */
+
+ enum register_status raw_read (int regnum, gdb_byte *buf);
+ template<typename T, typename = RequireLongest<T>>
+ enum register_status raw_read (int regnum, T *val);
+
+ /* Partial transfer of raw registers. Return the status of the register. */
+ enum register_status raw_read_part (int regnum, int offset, int len,
+ gdb_byte *buf);
+
+ /* Make certain that the register REGNUM is up-to-date. */
+ virtual void raw_update (int regnum) = 0;
-/* Save/restore a register cache. The set of registers saved /
- restored into the DST regcache determined by the save_reggroup /
- restore_reggroup respectively. COOKED_READ returns zero iff the
- register's value can't be returned. */
+ /* Transfer a raw register [0..NUM_REGS+NUM_PSEUDO_REGS) from core-gdb to
+ this regcache, return its value in *BUF and return its availability status. */
+ enum register_status cooked_read (int regnum, gdb_byte *buf);
+ template<typename T, typename = RequireLongest<T>>
+ enum register_status cooked_read (int regnum, T *val);
-typedef int (regcache_cooked_read_ftype) (void *src, int regnum,
- gdb_byte *buf);
+ /* Partial transfer of a cooked register. */
+ enum register_status cooked_read_part (int regnum, int offset, int len,
+ gdb_byte *buf);
-extern void regcache_save (struct regcache *dst,
- regcache_cooked_read_ftype *cooked_read,
- void *cooked_read_context);
-extern void regcache_restore (struct regcache *dst,
- regcache_cooked_read_ftype *cooked_read,
- void *cooked_read_context);
+ /* Read register REGNUM from the regcache and return a new value. This
+ will call mark_value_bytes_unavailable as appropriate. */
+ struct value *cooked_read_value (int regnum);
-/* Copy/duplicate the contents of a register cache. By default, the
- operation is pass-through. Writes to DST and reads from SRC will
- go through to the target.
+protected:
- The ``cpy'' functions can not have overlapping SRC and DST buffers.
+ /* Perform a partial register transfer using a read, modify, write
+ operation. Will fail if register is currently invalid. */
+ enum register_status read_part (int regnum, int offset, int len,
+ gdb_byte *out, bool is_raw);
+};
- ``no passthrough'' versions do not go through to the target. They
- only transfer values already in the cache. */
+/* Buffer of registers, can be read and written. */
-extern struct regcache *regcache_dup (struct regcache *regcache);
-extern struct regcache *regcache_dup_no_passthrough (struct regcache *regcache);
-extern void regcache_cpy (struct regcache *dest, struct regcache *src);
-extern void regcache_cpy_no_passthrough (struct regcache *dest, struct regcache *src);
+class detached_regcache : public readable_regcache
+{
+public:
+ detached_regcache (gdbarch *gdbarch, bool has_pseudo)
+ : readable_regcache (gdbarch, has_pseudo)
+ {}
+
+ void raw_update (int regnum) override
+ {}
+
+ DISABLE_COPY_AND_ASSIGN (detached_regcache);
+};
+
+class readonly_detached_regcache;
+
+/* The register cache for storing raw register values. */
+
+class regcache : public detached_regcache
+{
+public:
+ DISABLE_COPY_AND_ASSIGN (regcache);
+
+ /* Return REGCACHE's address space. */
+ const address_space *aspace () const
+ {
+ return m_aspace;
+ }
+
+ /* Restore 'this' regcache. The set of registers restored into
+ the regcache determined by the restore_reggroup.
+ Writes to regcache will go through to the target. SRC is a
+ read-only register cache. */
+ void restore (readonly_detached_regcache *src);
+
+ /* Update the value of raw register REGNUM (in the range [0..NUM_REGS)) and
+ transfer its value to core-gdb. */
+
+ void raw_write (int regnum, const gdb_byte *buf);
+
+ template<typename T, typename = RequireLongest<T>>
+ void raw_write (int regnum, T val);
+
+ /* Transfer of pseudo-registers. */
+ void cooked_write (int regnum, const gdb_byte *buf);
+
+ template<typename T, typename = RequireLongest<T>>
+ void cooked_write (int regnum, T val);
+
+ void raw_update (int regnum) override;
+
+ /* Partial transfer of raw registers. Perform read, modify, write style
+ operations. */
+ void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
+
+ /* Partial transfer of a cooked register. Perform read, modify, write style
+ operations. */
+ void cooked_write_part (int regnum, int offset, int len,
+ const gdb_byte *buf);
+
+ void supply_regset (const struct regset *regset,
+ int regnum, const void *buf, size_t size);
+
+
+ void collect_regset (const struct regset *regset, int regnum,
+ void *buf, size_t size) const;
+
+ /* Return REGCACHE's ptid. */
+
+ ptid_t ptid () const
+ {
+ gdb_assert (m_ptid != minus_one_ptid);
+
+ return m_ptid;
+ }
+
+ void set_ptid (const ptid_t ptid)
+ {
+ this->m_ptid = ptid;
+ }
+
+/* Dump the contents of a register from the register cache to the target
+ debug. */
+ void debug_print_register (const char *func, int regno);
+
+protected:
+ regcache (gdbarch *gdbarch, const address_space *aspace_);
+
+private:
+
+ /* Helper function for transfer_regset. Copies across a single register. */
+ void transfer_regset_register (struct regcache *out_regcache, int regnum,
+ const gdb_byte *in_buf, gdb_byte *out_buf,
+ int slot_size, int offs) const;
+
+ /* Transfer a single or all registers belonging to a certain register
+ set to or from a buffer. This is the main worker function for
+ regcache_supply_regset and regcache_collect_regset. */
+ void transfer_regset (const struct regset *regset,
+ struct regcache *out_regcache,
+ int regnum, const gdb_byte *in_buf,
+ gdb_byte *out_buf, size_t size) const;
+
+ /* Perform a partial register transfer using a read, modify, write
+ operation. */
+ enum register_status write_part (int regnum, int offset, int len,
+ const gdb_byte *in, bool is_raw);
+
+ /* The address space of this register cache (for registers where it
+ makes sense, like PC or SP). */
+ const address_space * const m_aspace;
+
+ /* If this is a read-write cache, which thread's registers is
+ it connected to? */
+ ptid_t m_ptid;
+
+ friend struct regcache *
+ get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
+ struct address_space *aspace);
+
+ friend void
+ registers_changed_ptid (ptid_t ptid);
+};
+
+class readonly_detached_regcache : public readable_regcache
+{
+public:
+ readonly_detached_regcache (regcache &src);
+
+ /* Create a readonly regcache by getting contents from COOKED_READ. */
+
+ readonly_detached_regcache (gdbarch *gdbarch, register_read_ftype cooked_read)
+ : readable_regcache (gdbarch, true)
+ {
+ save (cooked_read);
+ }
+
+ DISABLE_COPY_AND_ASSIGN (readonly_detached_regcache);
+
+ void raw_update (int regnum) override
+ {}
+};
extern void registers_changed (void);
+extern void registers_changed_ptid (ptid_t);
+
+/* Indicate that registers of THREAD may have changed, so invalidate
+ the cache. */
+extern void registers_changed_thread (thread_info *thread);
+
+/* An abstract base class for register dump. */
+
+class register_dump
+{
+public:
+ void dump (ui_file *file);
+ virtual ~register_dump () = default;
+
+protected:
+ register_dump (gdbarch *arch)
+ : m_gdbarch (arch)
+ {}
+
+ /* Dump the register REGNUM contents. If REGNUM is -1, print the
+ header. */
+ virtual void dump_reg (ui_file *file, int regnum) = 0;
+
+ gdbarch *m_gdbarch;
+};
#endif /* REGCACHE_H */
projects / deliverable / binutils-gdb.git / blobdiff