X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gdb%2Fregcache.h;h=4cf27a0b673f9e398f8fe33138d022c6e76a5e6f;hb=805acca042afed8e8431c92ab031167b03475676;hp=309ddb30aab3cfda936f496786232d2de5df903a;hpb=23303b2e52b988765b748cc7ab8652d8e0225585;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/regcache.h b/gdb/regcache.h
index 309ddb30aa..4cf27a0b67 100644
--- a/gdb/regcache.h
+++ b/gdb/regcache.h
@@ -1,13 +1,12 @@
/* 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) 1986-2017 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,
@@ -16,70 +15,116 @@
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 . */
#ifndef REGCACHE_H
#define REGCACHE_H
+#include "common-regcache.h"
+#include
+
struct regcache;
+struct regset;
struct gdbarch;
+struct address_space;
-extern struct regcache *current_regcache;
+extern struct regcache *get_current_regcache (void);
+extern struct regcache *get_thread_regcache (ptid_t ptid);
+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 *);
void regcache_xfree (struct regcache *regcache);
struct cleanup *make_cleanup_regcache_xfree (struct regcache *regcache);
-struct regcache *regcache_xmalloc (struct gdbarch *gdbarch);
+struct regcache *regcache_xmalloc (struct gdbarch *gdbarch,
+ struct address_space *aspace);
+
+/* Return REGCACHE's ptid. */
+
+extern ptid_t regcache_get_ptid (const struct regcache *regcache);
/* Return REGCACHE's architecture. */
extern struct gdbarch *get_regcache_arch (const struct regcache *regcache);
+/* Return REGCACHE's address space. */
+
+extern struct address_space *get_regcache_aspace (const struct regcache *);
+
+enum register_status regcache_register_status (const struct regcache *regcache,
+ int regnum);
+
+/* Make certain that the register REGNUM in REGCACHE is up-to-date. */
+
+void regcache_raw_update (struct regcache *regcache, int regnum);
+
/* Transfer a raw register [0..NUM_REGS) between core-gdb and the
- regcache. */
+ regcache. The read variants return the status of the register. */
-void regcache_raw_read (struct regcache *regcache, int rawnum, gdb_byte *buf);
+enum register_status 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 enum register_status
+ regcache_raw_read_signed (struct regcache *regcache,
+ int regnum, LONGEST *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. */
+/* Return the register's value in signed or throw if it's not
+ available. */
+
+extern LONGEST regcache_raw_get_signed (struct regcache *regcache,
+ int regnum);
-void regcache_raw_read_part (struct regcache *regcache, int regnum,
- int offset, int len, gdb_byte *buf);
+/* Set a raw register's value in the regcache's buffer. Unlike
+ regcache_raw_write, this is not write-through. The intention is
+ allowing to change the buffer contents of a read-only regcache
+ allocated with regcache_xmalloc. */
+
+extern void regcache_raw_set_cached_value
+ (struct regcache *regcache, int regnum, const gdb_byte *buf);
+
+/* Partial transfer of raw registers. These perform read, modify,
+ write style operations. The read variant returns the status of the
+ register. */
+
+extern enum register_status
+ 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 (struct regcache *regcache, int regnum);
+void regcache_invalidate (struct regcache *regcache, int regnum);
+
+/* Transfer of pseudo-registers. The read variants return a register
+ status, as an indication of when a ``cooked'' register was
+ constructed from valid, invalid or unavailable ``raw''
+ registers. */
/* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
-void regcache_cooked_read (struct regcache *regcache, int rawnum,
- gdb_byte *buf);
+enum register_status regcache_cooked_read (struct regcache *regcache,
+ int rawnum, gdb_byte *buf);
void regcache_cooked_write (struct regcache *regcache, int rawnum,
const gdb_byte *buf);
-/* 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. */
+/* Read register REGNUM from REGCACHE and return a new value. This
+ will call mark_value_bytes_unavailable as appropriate. */
+
+struct value *regcache_cooked_read_value (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,
@@ -88,11 +133,17 @@ extern void regcache_cooked_write_unsigned (struct regcache *regcache,
/* 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);
+enum register_status 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);
+/* Special routines to read/write the PC. */
+
+/* For regcache_read_pc see common/common-regcache.h. */
+extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
+
/* 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(). */
@@ -102,17 +153,50 @@ extern void regcache_raw_supply (struct regcache *regcache,
extern void regcache_raw_collect (const struct regcache *regcache,
int regnum, void *buf);
+/* Mapping between register numbers and offsets in a buffer, for use
+ in the '*regset' functions below. 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'.
+
+ - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
+ offset.
+
+ - If count=0: End of the map. */
-/* The register's ``offset''.
+struct regcache_map_entry
+{
+ int count;
+ int regno;
+ int size;
+};
- 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. */
+/* Special value for the 'regno' field in the struct above. */
-extern int register_offset_hack (struct gdbarch *gdbarch, int regnum);
+enum
+ {
+ REGCACHE_MAP_SKIP = -1,
+ };
+
+/* 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
@@ -133,67 +217,210 @@ extern int register_size (struct gdbarch *gdbarch, int regnum);
restore_reggroup respectively. COOKED_READ returns zero iff the
register's value can't be returned. */
-typedef int (regcache_cooked_read_ftype) (void *src, int regnum,
- gdb_byte *buf);
+typedef enum register_status (regcache_cooked_read_ftype) (void *src,
+ int regnum,
+ 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);
-/* 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.
+enum regcache_dump_what
+{
+ regcache_dump_none, regcache_dump_raw,
+ regcache_dump_cooked, regcache_dump_groups,
+ regcache_dump_remote
+};
- The ``cpy'' functions can not have overlapping SRC and DST buffers.
+/* The register cache for storing raw register values. */
- ``no passthrough'' versions do not go through to the target. They
- only transfer values already in the cache. */
+class regcache
+{
+public:
+ regcache (gdbarch *gdbarch, address_space *aspace_)
+ : regcache (gdbarch, aspace_, true)
+ {}
-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);
-
-/* NOTE: cagney/2002-11-02: The below have been superseded by the
- regcache_cooked_*() functions found above, and the frame_*()
- functions found in "frame.h". Take care though, often more than a
- simple substitution is required when updating the code. The
- change, as far as practical, should avoid adding references to
- global variables (e.g., current_regcache, current_frame,
- current_gdbarch or deprecated_selected_frame) and instead refer to
- the FRAME or REGCACHE that has been passed into the containing
- function as parameters. Consequently, the change typically
- involves modifying the containing function so that it takes a FRAME
- or REGCACHE parameter. In the case of an architecture vector
- method, there should already be a non-deprecated variant that is
- parameterized with FRAME or REGCACHE. */
-
-extern gdb_byte *deprecated_grub_regcache_for_registers (struct regcache *);
-extern void deprecated_read_register_gen (int regnum, gdb_byte *myaddr);
-extern void deprecated_write_register_gen (int regnum, gdb_byte *myaddr);
-
-/* NOTE: cagney/2002-11-05: This function has been superseeded by
- regcache_raw_supply(). */
-extern void deprecated_registers_fetched (void);
-
-extern int register_cached (int regnum);
-
-extern void set_register_cached (int regnum, int state);
+ struct readonly_t {};
+ static constexpr readonly_t readonly {};
-extern void registers_changed (void);
+ /* Create a readonly regcache from a non-readonly regcache. */
+ regcache (readonly_t, const regcache &src);
+
+ regcache (const regcache &) = delete;
+ void operator= (const regcache &) = delete;
+
+ /* class regcache is only extended in unit test, so only mark it
+ virtual when selftest is enabled. */
+#if GDB_SELF_TEST
+ virtual
+#endif
+ ~regcache ()
+ {
+ xfree (m_registers);
+ xfree (m_register_status);
+ }
+
+ gdbarch *arch () const;
+
+ address_space *aspace () const
+ {
+ return m_aspace;
+ }
+
+ void save (regcache_cooked_read_ftype *cooked_read, void *src);
+
+ enum register_status cooked_read (int regnum, gdb_byte *buf);
+ void cooked_write (int regnum, const gdb_byte *buf);
+
+ enum register_status raw_read (int regnum, gdb_byte *buf);
+
+ /* class regcache is only extended in unit test, so only mark it
+ virtual when selftest is enabled. */
+#if GDB_SELF_TEST
+ virtual
+#endif
+ void raw_write (int regnum, const gdb_byte *buf);
+
+ enum register_status raw_read_signed (int regnum, LONGEST *val);
+
+ void raw_write_signed (int regnum, LONGEST val);
+
+ enum register_status raw_read_unsigned (int regnum, ULONGEST *val);
+
+ void raw_write_unsigned (int regnum, ULONGEST val);
+
+ struct value *cooked_read_value (int regnum);
+ enum register_status cooked_read_signed (int regnum, LONGEST *val);
-/* Rename to read_unsigned_register()? */
-extern ULONGEST read_register (int regnum);
+ void cooked_write_signed (int regnum, LONGEST val);
-/* Rename to read_unsigned_register_pid()? */
-extern ULONGEST read_register_pid (int regnum, ptid_t ptid);
+ enum register_status cooked_read_unsigned (int regnum, ULONGEST *val);
-extern void write_register (int regnum, LONGEST val);
+ void cooked_write_unsigned (int regnum, ULONGEST val);
-extern void write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid);
+ void raw_update (int regnum);
+
+ void raw_collect (int regnum, void *buf) const;
+
+ void raw_collect_integer (int regnum, gdb_byte *addr, int addr_len,
+ bool is_signed) const;
+
+ void raw_supply (int regnum, const void *buf);
+
+ void raw_supply_integer (int regnum, const gdb_byte *addr, int addr_len,
+ bool is_signed);
+
+ void raw_supply_zeroed (int regnum);
+
+ enum register_status get_register_status (int regnum) const;
+
+ void raw_set_cached_value (int regnum, const gdb_byte *buf);
+
+ void invalidate (int regnum);
+
+ enum register_status raw_read_part (int regnum, int offset, int len,
+ gdb_byte *buf);
+
+ void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
+
+ enum register_status cooked_read_part (int regnum, int offset, int len,
+ gdb_byte *buf);
+
+ 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;
+
+ void dump (ui_file *file, enum regcache_dump_what what_to_dump);
+
+ ptid_t ptid () const
+ {
+ 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);
+
+ static void regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid);
+protected:
+ regcache (gdbarch *gdbarch, address_space *aspace_, bool readonly_p_);
+
+ static std::forward_list current_regcache;
+
+private:
+ gdb_byte *register_buffer (int regnum) const;
+
+ void restore (struct regcache *src);
+
+ void cpy_no_passthrough (struct regcache *src);
+
+ enum register_status xfer_part (int regnum, int offset, int len, void *in,
+ const void *out,
+ decltype (regcache_raw_read) read,
+ decltype (regcache_raw_write) write);
+
+ void transfer_regset (const struct regset *regset,
+ struct regcache *out_regcache,
+ int regnum, const void *in_buf,
+ void *out_buf, size_t size) const;
+
+ struct regcache_descr *m_descr;
+
+ /* The address space of this register cache (for registers where it
+ makes sense, like PC or SP). */
+ struct address_space *m_aspace;
+
+ /* The register buffers. A read-only register cache can hold the
+ full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write
+ register cache can only hold [0 .. gdbarch_num_regs). */
+ gdb_byte *m_registers;
+ /* Register cache status. */
+ signed char *m_register_status;
+ /* Is this a read-only cache? A read-only cache is used for saving
+ the target's register state (e.g, across an inferior function
+ call or just before forcing a function return). A read-only
+ cache can only be updated via the methods regcache_dup() and
+ regcache_cpy(). The actual contents are determined by the
+ reggroup_save and reggroup_restore methods. */
+ bool m_readonly_p;
+ /* 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);
+
+ friend void
+ regcache_cpy (struct regcache *dst, struct regcache *src);
+};
+
+/* 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. See also regcache_cpy_no_passthrough.
+
+ regcache_cpy can not have overlapping SRC and DST buffers. */
+
+extern struct regcache *regcache_dup (struct regcache *regcache);
+extern void regcache_cpy (struct regcache *dest, struct regcache *src);
+
+extern void registers_changed (void);
+extern void registers_changed_ptid (ptid_t);
#endif /* REGCACHE_H */