/* Cache and manage the values of registers for GDB, the GNU debugger.
- Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000, 2001
- Free Software Foundation, Inc.
+
+ Copyright (C) 1986-1987, 1989, 1991, 1994-1996, 1998, 2000-2002,
+ 2004, 2007-2012 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "inferior.h"
#include "gdbarch.h"
#include "gdbcmd.h"
#include "regcache.h"
+#include "reggroups.h"
#include "gdb_assert.h"
+#include "gdb_string.h"
+#include "gdbcmd.h" /* For maintenanceprintlist. */
+#include "observer.h"
+#include "exceptions.h"
+#include "remote.h"
/*
* DATA STRUCTURE
* Here is the actual register cache.
*/
-/* NOTE: this is a write-through cache. There is no "dirty" bit for
- recording if the register values have been changed (eg. by the
- user). Therefore all registers must be written back to the
- target when appropriate. */
-
-/* REGISTERS contains the cached register values (in target byte order). */
+/* Per-architecture object describing the layout of a register cache.
+ Computed once when the architecture is created. */
-char *registers;
+struct gdbarch_data *regcache_descr_handle;
-/* REGISTER_VALID is 0 if the register needs to be fetched,
- 1 if it has been fetched, and
- -1 if the register value was not available.
- "Not available" means don't try to fetch it again. */
-
-signed char *register_valid;
+struct regcache_descr
+{
+ /* The architecture this descriptor belongs to. */
+ struct gdbarch *gdbarch;
+
+ /* The raw register cache. Each raw (or hard) register is supplied
+ by the target interface. The raw cache should not contain
+ redundant information - if the PC is constructed from two
+ registers then those registers and not the PC lives in the raw
+ cache. */
+ int nr_raw_registers;
+ long sizeof_raw_registers;
+ long sizeof_raw_register_status;
+
+ /* The cooked register space. Each cooked register in the range
+ [0..NR_RAW_REGISTERS) is direct-mapped onto the corresponding raw
+ register. The remaining [NR_RAW_REGISTERS
+ .. NR_COOKED_REGISTERS) (a.k.a. pseudo registers) are mapped onto
+ both raw registers and memory by the architecture methods
+ gdbarch_pseudo_register_read and gdbarch_pseudo_register_write. */
+ int nr_cooked_registers;
+ long sizeof_cooked_registers;
+ long sizeof_cooked_register_status;
+
+ /* Offset and size (in 8 bit bytes), of each register in the
+ register cache. All registers (including those in the range
+ [NR_RAW_REGISTERS .. NR_COOKED_REGISTERS) are given an
+ offset. */
+ long *register_offset;
+ long *sizeof_register;
+
+ /* Cached table containing the type of each register. */
+ struct type **register_type;
+};
+
+static void *
+init_regcache_descr (struct gdbarch *gdbarch)
+{
+ int i;
+ struct regcache_descr *descr;
+ gdb_assert (gdbarch != NULL);
+
+ /* Create an initial, zero filled, table. */
+ descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct regcache_descr);
+ descr->gdbarch = gdbarch;
+
+ /* Total size of the register space. The raw registers are mapped
+ directly onto the raw register cache while the pseudo's are
+ either mapped onto raw-registers or memory. */
+ descr->nr_cooked_registers = gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch);
+ descr->sizeof_cooked_register_status
+ = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
+
+ /* Fill in a table of register types. */
+ descr->register_type
+ = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers,
+ struct type *);
+ for (i = 0; i < descr->nr_cooked_registers; i++)
+ descr->register_type[i] = gdbarch_register_type (gdbarch, i);
+
+ /* Construct a strictly RAW register cache. Don't allow pseudo's
+ into the register cache. */
+ descr->nr_raw_registers = gdbarch_num_regs (gdbarch);
+ descr->sizeof_raw_register_status = gdbarch_num_regs (gdbarch);
+
+ /* Lay out the register cache.
+
+ NOTE: cagney/2002-05-22: Only register_type() is used when
+ constructing the register cache. It is assumed that the
+ register's raw size, virtual size and type length are all the
+ same. */
+
+ {
+ long offset = 0;
+
+ descr->sizeof_register
+ = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long);
+ descr->register_offset
+ = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long);
+ for (i = 0; i < descr->nr_raw_registers; i++)
+ {
+ descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]);
+ descr->register_offset[i] = offset;
+ offset += descr->sizeof_register[i];
+ gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]);
+ }
+ /* Set the real size of the raw register cache buffer. */
+ descr->sizeof_raw_registers = offset;
+
+ for (; i < descr->nr_cooked_registers; i++)
+ {
+ descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]);
+ descr->register_offset[i] = offset;
+ offset += descr->sizeof_register[i];
+ gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]);
+ }
+ /* Set the real size of the readonly register cache buffer. */
+ descr->sizeof_cooked_registers = offset;
+ }
+
+ return descr;
+}
-/* The thread/process associated with the current set of registers. */
+static struct regcache_descr *
+regcache_descr (struct gdbarch *gdbarch)
+{
+ return gdbarch_data (gdbarch, regcache_descr_handle);
+}
-static ptid_t registers_ptid;
+/* Utility functions returning useful register attributes stored in
+ the regcache descr. */
-/*
- * FUNCTIONS:
- */
+struct type *
+register_type (struct gdbarch *gdbarch, int regnum)
+{
+ struct regcache_descr *descr = regcache_descr (gdbarch);
-/* REGISTER_CACHED()
+ gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
+ return descr->register_type[regnum];
+}
- Returns 0 if the value is not in the cache (needs fetch).
- >0 if the value is in the cache.
- <0 if the value is permanently unavailable (don't ask again). */
+/* Utility functions returning useful register attributes stored in
+ the regcache descr. */
int
-register_cached (int regnum)
+register_size (struct gdbarch *gdbarch, int regnum)
{
- return register_valid[regnum];
+ struct regcache_descr *descr = regcache_descr (gdbarch);
+ int size;
+
+ gdb_assert (regnum >= 0
+ && regnum < (gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch)));
+ size = descr->sizeof_register[regnum];
+ return size;
}
-/* Record that REGNUM's value is cached if STATE is >0, uncached but
- fetchable if STATE is 0, and uncached and unfetchable if STATE is <0. */
+/* The register cache for storing raw register values. */
-void
-set_register_cached (int regnum, int state)
+struct regcache
+{
+ struct regcache_descr *descr;
+
+ /* The address space of this register cache (for registers where it
+ makes sense, like PC or SP). */
+ struct address_space *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 *registers;
+ /* Register cache status. */
+ signed char *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. */
+ int readonly_p;
+ /* If this is a read-write cache, which thread's registers is
+ it connected to? */
+ ptid_t ptid;
+};
+
+static struct regcache *
+regcache_xmalloc_1 (struct gdbarch *gdbarch, struct address_space *aspace,
+ int readonly_p)
{
- register_valid[regnum] = state;
+ struct regcache_descr *descr;
+ struct regcache *regcache;
+
+ gdb_assert (gdbarch != NULL);
+ descr = regcache_descr (gdbarch);
+ regcache = XMALLOC (struct regcache);
+ regcache->descr = descr;
+ regcache->readonly_p = readonly_p;
+ if (readonly_p)
+ {
+ regcache->registers
+ = XCALLOC (descr->sizeof_cooked_registers, gdb_byte);
+ regcache->register_status
+ = XCALLOC (descr->sizeof_cooked_register_status, gdb_byte);
+ }
+ else
+ {
+ regcache->registers
+ = XCALLOC (descr->sizeof_raw_registers, gdb_byte);
+ regcache->register_status
+ = XCALLOC (descr->sizeof_raw_register_status, gdb_byte);
+ }
+ regcache->aspace = aspace;
+ regcache->ptid = minus_one_ptid;
+ return regcache;
}
-/* REGISTER_CHANGED
+struct regcache *
+regcache_xmalloc (struct gdbarch *gdbarch, struct address_space *aspace)
+{
+ return regcache_xmalloc_1 (gdbarch, aspace, 1);
+}
- invalidate a single register REGNUM in the cache */
void
-register_changed (int regnum)
+regcache_xfree (struct regcache *regcache)
{
- set_register_cached (regnum, 0);
+ if (regcache == NULL)
+ return;
+ xfree (regcache->registers);
+ xfree (regcache->register_status);
+ xfree (regcache);
}
-/* If REGNUM >= 0, return a pointer to register REGNUM's cache buffer area,
- else return a pointer to the start of the cache buffer. */
+static void
+do_regcache_xfree (void *data)
+{
+ regcache_xfree (data);
+}
-static char *
-register_buffer (int regnum)
+struct cleanup *
+make_cleanup_regcache_xfree (struct regcache *regcache)
{
- gdb_assert (regnum >= 0 && regnum < (NUM_REGS + NUM_PSEUDO_REGS));
- return ®isters[REGISTER_BYTE (regnum)];
+ return make_cleanup (do_regcache_xfree, regcache);
}
-/* Return whether register REGNUM is a real register. */
+/* Return REGCACHE's architecture. */
-static int
-real_register (int regnum)
+struct gdbarch *
+get_regcache_arch (const struct regcache *regcache)
{
- return regnum >= 0 && regnum < NUM_REGS;
+ return regcache->descr->gdbarch;
}
-/* Return whether register REGNUM is a pseudo register. */
-
-static int
-pseudo_register (int regnum)
+struct address_space *
+get_regcache_aspace (const struct regcache *regcache)
{
- return regnum >= NUM_REGS && regnum < NUM_REGS + NUM_PSEUDO_REGS;
+ return regcache->aspace;
}
-/* Fetch register REGNUM into the cache. */
+/* Return a pointer to register REGNUM's buffer cache. */
-static void
-fetch_register (int regnum)
+static gdb_byte *
+register_buffer (const struct regcache *regcache, int regnum)
{
- /* NOTE: cagney/2001-12-04: Legacy targets were using fetch/store
- pseudo-register as a way of handling registers that needed to be
- constructed from one or more raw registers. New targets instead
- use gdbarch register read/write. */
- if (FETCH_PSEUDO_REGISTER_P ()
- && pseudo_register (regnum))
- FETCH_PSEUDO_REGISTER (regnum);
- target_fetch_registers (regnum);
+ return regcache->registers + regcache->descr->register_offset[regnum];
}
-/* Write register REGNUM cached value to the target. */
+void
+regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read,
+ void *src)
+{
+ struct gdbarch *gdbarch = dst->descr->gdbarch;
+ gdb_byte buf[MAX_REGISTER_SIZE];
+ int regnum;
+
+ /* The DST should be `read-only', if it wasn't then the save would
+ end up trying to write the register values back out to the
+ target. */
+ gdb_assert (dst->readonly_p);
+ /* Clear the dest. */
+ memset (dst->registers, 0, dst->descr->sizeof_cooked_registers);
+ memset (dst->register_status, 0,
+ dst->descr->sizeof_cooked_register_status);
+ /* Copy over any registers (identified by their membership in the
+ save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs +
+ gdbarch_num_pseudo_regs) range is checked since some architectures need
+ to save/restore `cooked' registers that live in memory. */
+ for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++)
+ {
+ if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup))
+ {
+ enum register_status status = cooked_read (src, regnum, buf);
+
+ if (status == REG_VALID)
+ memcpy (register_buffer (dst, regnum), buf,
+ register_size (gdbarch, regnum));
+ else
+ {
+ gdb_assert (status != REG_UNKNOWN);
+
+ memset (register_buffer (dst, regnum), 0,
+ register_size (gdbarch, regnum));
+ }
+ dst->register_status[regnum] = status;
+ }
+ }
+}
static void
-store_register (int regnum)
+regcache_restore (struct regcache *dst,
+ regcache_cooked_read_ftype *cooked_read,
+ void *cooked_read_context)
{
- /* NOTE: cagney/2001-12-04: Legacy targets were using fetch/store
- pseudo-register as a way of handling registers that needed to be
- constructed from one or more raw registers. New targets instead
- use gdbarch register read/write. */
- if (STORE_PSEUDO_REGISTER_P ()
- && pseudo_register (regnum))
- STORE_PSEUDO_REGISTER (regnum);
- target_store_registers (regnum);
-}
+ struct gdbarch *gdbarch = dst->descr->gdbarch;
+ gdb_byte buf[MAX_REGISTER_SIZE];
+ int regnum;
-/* Low level examining and depositing of registers.
+ /* The dst had better not be read-only. If it is, the `restore'
+ doesn't make much sense. */
+ gdb_assert (!dst->readonly_p);
+ /* Copy over any registers, being careful to only restore those that
+ were both saved and need to be restored. The full [0 .. gdbarch_num_regs
+ + gdbarch_num_pseudo_regs) range is checked since some architectures need
+ to save/restore `cooked' registers that live in memory. */
+ for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++)
+ {
+ if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup))
+ {
+ enum register_status status;
- The caller is responsible for making sure that the inferior is
- stopped before calling the fetching routines, or it will get
- garbage. (a change from GDB version 3, in which the caller got the
- value from the last stop). */
+ status = cooked_read (cooked_read_context, regnum, buf);
+ if (status == REG_VALID)
+ regcache_cooked_write (dst, regnum, buf);
+ }
+ }
+}
-/* REGISTERS_CHANGED ()
+static enum register_status
+do_cooked_read (void *src, int regnum, gdb_byte *buf)
+{
+ struct regcache *regcache = src;
- Indicate that registers may have changed, so invalidate the cache. */
+ return regcache_cooked_read (regcache, regnum, buf);
+}
void
-registers_changed (void)
+regcache_cpy (struct regcache *dst, struct regcache *src)
{
- int i;
+ gdb_assert (src != NULL && dst != NULL);
+ gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
+ gdb_assert (src != dst);
+ gdb_assert (src->readonly_p || dst->readonly_p);
+
+ if (!src->readonly_p)
+ regcache_save (dst, do_cooked_read, src);
+ else if (!dst->readonly_p)
+ regcache_restore (dst, do_cooked_read, src);
+ else
+ regcache_cpy_no_passthrough (dst, src);
+}
- registers_ptid = pid_to_ptid (-1);
+void
+regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src)
+{
+ gdb_assert (src != NULL && dst != NULL);
+ gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
+ /* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough
+ move of data into a thread's regcache. Doing this would be silly
+ - it would mean that regcache->register_status would be
+ completely invalid. */
+ gdb_assert (dst->readonly_p && src->readonly_p);
+
+ memcpy (dst->registers, src->registers,
+ dst->descr->sizeof_cooked_registers);
+ memcpy (dst->register_status, src->register_status,
+ dst->descr->sizeof_cooked_register_status);
+}
- /* Force cleanup of any alloca areas if using C alloca instead of
- a builtin alloca. This particular call is used to clean up
- areas allocated by low level target code which may build up
- during lengthy interactions between gdb and the target before
- gdb gives control to the user (ie watchpoints). */
- alloca (0);
+struct regcache *
+regcache_dup (struct regcache *src)
+{
+ struct regcache *newbuf;
+
+ newbuf = regcache_xmalloc (src->descr->gdbarch, get_regcache_aspace (src));
+ regcache_cpy (newbuf, src);
+ return newbuf;
+}
- for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
- set_register_cached (i, 0);
+int
+regcache_register_status (const struct regcache *regcache, int regnum)
+{
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0);
+ if (regcache->readonly_p)
+ gdb_assert (regnum < regcache->descr->nr_cooked_registers);
+ else
+ gdb_assert (regnum < regcache->descr->nr_raw_registers);
- if (registers_changed_hook)
- registers_changed_hook ();
+ return regcache->register_status[regnum];
}
-/* REGISTERS_FETCHED ()
+void
+regcache_invalidate (struct regcache *regcache, int regnum)
+{
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0);
+ gdb_assert (!regcache->readonly_p);
+ gdb_assert (regnum < regcache->descr->nr_raw_registers);
+ regcache->register_status[regnum] = REG_UNKNOWN;
+}
- Indicate that all registers have been fetched, so mark them all valid. */
-/* NOTE: cagney/2001-12-04: This function does not set valid on the
- pseudo-register range since pseudo registers are always supplied
- using supply_register(). */
-/* FIXME: cagney/2001-12-04: This function is DEPRECATED. The target
- code was blatting the registers[] array and then calling this.
- Since targets should only be using supply_register() the need for
- this function/hack is eliminated. */
+/* Global structure containing the current regcache. */
-void
-registers_fetched (void)
+/* NOTE: this is a write-through cache. There is no "dirty" bit for
+ recording if the register values have been changed (eg. by the
+ user). Therefore all registers must be written back to the
+ target when appropriate. */
+
+struct regcache_list
{
- int i;
+ struct regcache *regcache;
+ struct regcache_list *next;
+};
- for (i = 0; i < NUM_REGS; i++)
- set_register_cached (i, 1);
- /* Do not assume that the pseudo-regs have also been fetched.
- Fetching all real regs NEVER accounts for pseudo-regs. */
-}
-
-/* read_register_bytes and write_register_bytes are generally a *BAD*
- idea. They are inefficient because they need to check for partial
- updates, which can only be done by scanning through all of the
- registers and seeing if the bytes that are being read/written fall
- inside of an invalid register. [The main reason this is necessary
- is that register sizes can vary, so a simple index won't suffice.]
- It is far better to call read_register_gen and write_register_gen
- if you want to get at the raw register contents, as it only takes a
- regnum as an argument, and therefore can't do a partial register
- update.
-
- Prior to the recent fixes to check for partial updates, both read
- and write_register_bytes always checked to see if any registers
- were stale, and then called target_fetch_registers (-1) to update
- the whole set. This caused really slowed things down for remote
- targets. */
-
-/* Copy INLEN bytes of consecutive data from registers
- starting with the INREGBYTE'th byte of register data
- into memory at MYADDR. */
+static struct regcache_list *current_regcache;
-void
-read_register_bytes (int in_start, char *in_buf, int in_len)
+struct regcache *
+get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
+ struct address_space *aspace)
{
- int in_end = in_start + in_len;
- int regnum;
- char *reg_buf = alloca (MAX_REGISTER_RAW_SIZE);
+ struct regcache_list *list;
+ struct regcache *new_regcache;
- /* See if we are trying to read bytes from out-of-date registers. If so,
- update just those registers. */
+ for (list = current_regcache; list; list = list->next)
+ if (ptid_equal (list->regcache->ptid, ptid)
+ && get_regcache_arch (list->regcache) == gdbarch)
+ return list->regcache;
- for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
- {
- int reg_start;
- int reg_end;
- int reg_len;
- int start;
- int end;
- int byte;
-
- reg_start = REGISTER_BYTE (regnum);
- reg_len = REGISTER_RAW_SIZE (regnum);
- reg_end = reg_start + reg_len;
-
- if (reg_end <= in_start || in_end <= reg_start)
- /* The range the user wants to read doesn't overlap with regnum. */
- continue;
-
- if (REGISTER_NAME (regnum) != NULL && *REGISTER_NAME (regnum) != '\0')
- /* Force the cache to fetch the entire register. */
- read_register_gen (regnum, reg_buf);
- else
- /* Legacy note: even though this register is ``invalid'' we
- still need to return something. It would appear that some
- code relies on apparent gaps in the register array also
- being returned. */
- /* FIXME: cagney/2001-08-18: This is just silly. It defeats
- the entire register read/write flow of control. Must
- resist temptation to return 0xdeadbeef. */
- memcpy (reg_buf, registers + reg_start, reg_len);
-
- /* Legacy note: This function, for some reason, allows a NULL
- input buffer. If the buffer is NULL, the registers are still
- fetched, just the final transfer is skipped. */
- if (in_buf == NULL)
- continue;
-
- /* start = max (reg_start, in_start) */
- if (reg_start > in_start)
- start = reg_start;
- else
- start = in_start;
+ new_regcache = regcache_xmalloc_1 (gdbarch, aspace, 0);
+ new_regcache->ptid = ptid;
- /* end = min (reg_end, in_end) */
- if (reg_end < in_end)
- end = reg_end;
- else
- end = in_end;
+ list = xmalloc (sizeof (struct regcache_list));
+ list->regcache = new_regcache;
+ list->next = current_regcache;
+ current_regcache = list;
- /* Transfer just the bytes common to both IN_BUF and REG_BUF */
- for (byte = start; byte < end; byte++)
- {
- in_buf[byte - in_start] = reg_buf[byte - reg_start];
- }
- }
+ return new_regcache;
+}
+
+struct regcache *
+get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch)
+{
+ struct address_space *aspace;
+
+ /* For the benefit of "maint print registers" & co when debugging an
+ executable, allow dumping the regcache even when there is no
+ thread selected (target_thread_address_space internal-errors if
+ no address space is found). Note that normal user commands will
+ fail higher up on the call stack due to no
+ target_has_registers. */
+ aspace = (ptid_equal (null_ptid, ptid)
+ ? NULL
+ : target_thread_address_space (ptid));
+
+ return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace);
}
-/* Read register REGNUM into memory at MYADDR, which must be large
- enough for REGISTER_RAW_BYTES (REGNUM). Target byte-order. If the
- register is known to be the size of a CORE_ADDR or smaller,
- read_register can be used instead. */
+static ptid_t current_thread_ptid;
+static struct gdbarch *current_thread_arch;
-static void
-legacy_read_register_gen (int regnum, char *myaddr)
+struct regcache *
+get_thread_regcache (ptid_t ptid)
{
- gdb_assert (regnum >= 0 && regnum < (NUM_REGS + NUM_PSEUDO_REGS));
- if (! ptid_equal (registers_ptid, inferior_ptid))
+ if (!current_thread_arch || !ptid_equal (current_thread_ptid, ptid))
{
- registers_changed ();
- registers_ptid = inferior_ptid;
+ current_thread_ptid = ptid;
+ current_thread_arch = target_thread_architecture (ptid);
}
- if (!register_cached (regnum))
- fetch_register (regnum);
+ return get_thread_arch_regcache (ptid, current_thread_arch);
+}
- memcpy (myaddr, register_buffer (regnum),
- REGISTER_RAW_SIZE (regnum));
+struct regcache *
+get_current_regcache (void)
+{
+ return get_thread_regcache (inferior_ptid);
}
-void
-regcache_read (int rawnum, char *buf)
+
+/* Observer for the target_changed event. */
+
+static void
+regcache_observer_target_changed (struct target_ops *target)
{
- gdb_assert (rawnum >= 0 && rawnum < NUM_REGS);
- /* For moment, just use underlying legacy code. Ulgh!!! */
- legacy_read_register_gen (rawnum, buf);
+ registers_changed ();
}
-void
-read_register_gen (int regnum, char *buf)
+/* Update global variables old ptids to hold NEW_PTID if they were
+ holding OLD_PTID. */
+static void
+regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid)
{
- if (! gdbarch_register_read_p (current_gdbarch))
- {
- legacy_read_register_gen (regnum, buf);
- return;
- }
- gdbarch_register_read (current_gdbarch, regnum, buf);
+ struct regcache_list *list;
+
+ for (list = current_regcache; list; list = list->next)
+ if (ptid_equal (list->regcache->ptid, old_ptid))
+ list->regcache->ptid = new_ptid;
}
+/* Low level examining and depositing of registers.
-/* Write register REGNUM at MYADDR to the target. MYADDR points at
- REGISTER_RAW_BYTES(REGNUM), which must be in target byte-order. */
+ The caller is responsible for making sure that the inferior is
+ stopped before calling the fetching routines, or it will get
+ garbage. (a change from GDB version 3, in which the caller got the
+ value from the last stop). */
-static void
-legacy_write_register_gen (int regnum, char *myaddr)
-{
- int size;
- gdb_assert (regnum >= 0 && regnum < (NUM_REGS + NUM_PSEUDO_REGS));
+/* REGISTERS_CHANGED ()
- /* On the sparc, writing %g0 is a no-op, so we don't even want to
- change the registers array if something writes to this register. */
- if (CANNOT_STORE_REGISTER (regnum))
- return;
+ Indicate that registers may have changed, so invalidate the cache. */
+
+void
+registers_changed_ptid (ptid_t ptid)
+{
+ struct regcache_list *list, **list_link;
- if (! ptid_equal (registers_ptid, inferior_ptid))
+ list = current_regcache;
+ list_link = ¤t_regcache;
+ while (list)
{
- registers_changed ();
- registers_ptid = inferior_ptid;
- }
+ if (ptid_match (list->regcache->ptid, ptid))
+ {
+ struct regcache_list *dead = list;
- size = REGISTER_RAW_SIZE (regnum);
+ *list_link = list->next;
+ regcache_xfree (list->regcache);
+ list = *list_link;
+ xfree (dead);
+ continue;
+ }
- if (real_register (regnum))
- {
- /* If we have a valid copy of the register, and new value == old
- value, then don't bother doing the actual store. */
- if (register_cached (regnum)
- && memcmp (register_buffer (regnum), myaddr, size) == 0)
- return;
- else
- target_prepare_to_store ();
+ list_link = &list->next;
+ list = *list_link;
}
- memcpy (register_buffer (regnum), myaddr, size);
+ if (ptid_match (current_thread_ptid, ptid))
+ {
+ current_thread_ptid = null_ptid;
+ current_thread_arch = NULL;
+ }
- set_register_cached (regnum, 1);
- store_register (regnum);
+ if (ptid_match (inferior_ptid, ptid))
+ {
+ /* We just deleted the regcache of the current thread. Need to
+ forget about any frames we have cached, too. */
+ reinit_frame_cache ();
+ }
}
void
-regcache_write (int rawnum, char *buf)
+registers_changed (void)
{
- gdb_assert (rawnum >= 0 && rawnum < NUM_REGS);
- /* For moment, just use underlying legacy code. Ulgh!!! */
- legacy_write_register_gen (rawnum, buf);
+ registers_changed_ptid (minus_one_ptid);
+
+ /* Force cleanup of any alloca areas if using C alloca instead of
+ a builtin alloca. This particular call is used to clean up
+ areas allocated by low level target code which may build up
+ during lengthy interactions between gdb and the target before
+ gdb gives control to the user (ie watchpoints). */
+ alloca (0);
}
-void
-write_register_gen (int regnum, char *buf)
+enum register_status
+regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
{
- if (! gdbarch_register_write_p (current_gdbarch))
+ gdb_assert (regcache != NULL && buf != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
+ /* Make certain that the register cache is up-to-date with respect
+ to the current thread. This switching shouldn't be necessary
+ only there is still only one target side register cache. Sigh!
+ On the bright side, at least there is a regcache object. */
+ if (!regcache->readonly_p
+ && regcache_register_status (regcache, regnum) == REG_UNKNOWN)
{
- legacy_write_register_gen (regnum, buf);
- return;
+ struct cleanup *old_chain = save_inferior_ptid ();
+
+ inferior_ptid = regcache->ptid;
+ target_fetch_registers (regcache, regnum);
+ do_cleanups (old_chain);
+
+ /* A number of targets can't access the whole set of raw
+ registers (because the debug API provides no means to get at
+ them). */
+ if (regcache->register_status[regnum] == REG_UNKNOWN)
+ regcache->register_status[regnum] = REG_UNAVAILABLE;
}
- gdbarch_register_write (current_gdbarch, regnum, buf);
+
+ if (regcache->register_status[regnum] != REG_VALID)
+ memset (buf, 0, regcache->descr->sizeof_register[regnum]);
+ else
+ memcpy (buf, register_buffer (regcache, regnum),
+ regcache->descr->sizeof_register[regnum]);
+
+ return regcache->register_status[regnum];
+}
+
+enum register_status
+regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val)
+{
+ gdb_byte *buf;
+ enum register_status status;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ status = regcache_raw_read (regcache, regnum, buf);
+ if (status == REG_VALID)
+ *val = extract_signed_integer
+ (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch));
+ else
+ *val = 0;
+ return status;
}
-/* Copy INLEN bytes of consecutive data from memory at MYADDR
- into registers starting with the MYREGSTART'th byte of register data. */
+enum register_status
+regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
+ ULONGEST *val)
+{
+ gdb_byte *buf;
+ enum register_status status;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ status = regcache_raw_read (regcache, regnum, buf);
+ if (status == REG_VALID)
+ *val = extract_unsigned_integer
+ (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch));
+ else
+ *val = 0;
+ return status;
+}
void
-write_register_bytes (int myregstart, char *myaddr, int inlen)
+regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val)
{
- int myregend = myregstart + inlen;
- int regnum;
+ void *buf;
- target_prepare_to_store ();
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ store_signed_integer (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch), val);
+ regcache_raw_write (regcache, regnum, buf);
+}
- /* Scan through the registers updating any that are covered by the
- range myregstart<=>myregend using write_register_gen, which does
- nice things like handling threads, and avoiding updates when the
- new and old contents are the same. */
+void
+regcache_raw_write_unsigned (struct regcache *regcache, int regnum,
+ ULONGEST val)
+{
+ void *buf;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch), val);
+ regcache_raw_write (regcache, regnum, buf);
+}
- for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
+enum register_status
+regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf)
+{
+ gdb_assert (regnum >= 0);
+ gdb_assert (regnum < regcache->descr->nr_cooked_registers);
+ if (regnum < regcache->descr->nr_raw_registers)
+ return regcache_raw_read (regcache, regnum, buf);
+ else if (regcache->readonly_p
+ && regcache->register_status[regnum] != REG_UNKNOWN)
{
- int regstart, regend;
+ /* Read-only register cache, perhaps the cooked value was
+ cached? */
+ struct gdbarch *gdbarch = regcache->descr->gdbarch;
- regstart = REGISTER_BYTE (regnum);
- regend = regstart + REGISTER_RAW_SIZE (regnum);
+ if (regcache->register_status[regnum] == REG_VALID)
+ memcpy (buf, register_buffer (regcache, regnum),
+ regcache->descr->sizeof_register[regnum]);
+ else
+ memset (buf, 0, regcache->descr->sizeof_register[regnum]);
- /* Is this register completely outside the range the user is writing? */
- if (myregend <= regstart || regend <= myregstart)
- /* do nothing */ ;
+ return regcache->register_status[regnum];
+ }
+ else if (gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch))
+ {
+ struct value *mark, *computed;
+ enum register_status result = REG_VALID;
- /* Is this register completely within the range the user is writing? */
- else if (myregstart <= regstart && regend <= myregend)
- write_register_gen (regnum, myaddr + (regstart - myregstart));
+ mark = value_mark ();
- /* The register partially overlaps the range being written. */
+ computed = gdbarch_pseudo_register_read_value (regcache->descr->gdbarch,
+ regcache, regnum);
+ if (value_entirely_available (computed))
+ memcpy (buf, value_contents_raw (computed),
+ regcache->descr->sizeof_register[regnum]);
else
{
- char *regbuf = (char*) alloca (MAX_REGISTER_RAW_SIZE);
- /* What's the overlap between this register's bytes and
- those the caller wants to write? */
- int overlapstart = max (regstart, myregstart);
- int overlapend = min (regend, myregend);
-
- /* We may be doing a partial update of an invalid register.
- Update it from the target before scribbling on it. */
- read_register_gen (regnum, regbuf);
+ memset (buf, 0, regcache->descr->sizeof_register[regnum]);
+ result = REG_UNAVAILABLE;
+ }
- memcpy (registers + overlapstart,
- myaddr + (overlapstart - myregstart),
- overlapend - overlapstart);
+ value_free_to_mark (mark);
- store_register (regnum);
- }
+ return result;
}
+ else
+ return gdbarch_pseudo_register_read (regcache->descr->gdbarch, regcache,
+ regnum, buf);
}
+struct value *
+regcache_cooked_read_value (struct regcache *regcache, int regnum)
+{
+ gdb_assert (regnum >= 0);
+ gdb_assert (regnum < regcache->descr->nr_cooked_registers);
-/* Return the contents of register REGNUM as an unsigned integer. */
+ if (regnum < regcache->descr->nr_raw_registers
+ || (regcache->readonly_p
+ && regcache->register_status[regnum] != REG_UNKNOWN)
+ || !gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch))
+ {
+ struct value *result;
+
+ result = allocate_value (register_type (regcache->descr->gdbarch,
+ regnum));
+ VALUE_LVAL (result) = lval_register;
+ VALUE_REGNUM (result) = regnum;
+
+ /* It is more efficient in general to do this delegation in this
+ direction than in the other one, even though the value-based
+ API is preferred. */
+ if (regcache_cooked_read (regcache, regnum,
+ value_contents_raw (result)) == REG_UNAVAILABLE)
+ mark_value_bytes_unavailable (result, 0,
+ TYPE_LENGTH (value_type (result)));
+
+ return result;
+ }
+ else
+ return gdbarch_pseudo_register_read_value (regcache->descr->gdbarch,
+ regcache, regnum);
+}
-ULONGEST
-read_register (int regnum)
+enum register_status
+regcache_cooked_read_signed (struct regcache *regcache, int regnum,
+ LONGEST *val)
{
- char *buf = alloca (REGISTER_RAW_SIZE (regnum));
- read_register_gen (regnum, buf);
- return (extract_unsigned_integer (buf, REGISTER_RAW_SIZE (regnum)));
+ enum register_status status;
+ gdb_byte *buf;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ status = regcache_cooked_read (regcache, regnum, buf);
+ if (status == REG_VALID)
+ *val = extract_signed_integer
+ (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch));
+ else
+ *val = 0;
+ return status;
}
-ULONGEST
-read_register_pid (int regnum, ptid_t ptid)
+enum register_status
+regcache_cooked_read_unsigned (struct regcache *regcache, int regnum,
+ ULONGEST *val)
{
- ptid_t save_ptid;
- int save_pid;
- CORE_ADDR retval;
-
- if (ptid_equal (ptid, inferior_ptid))
- return read_register (regnum);
-
- save_ptid = inferior_ptid;
-
- inferior_ptid = ptid;
-
- retval = read_register (regnum);
+ enum register_status status;
+ gdb_byte *buf;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ status = regcache_cooked_read (regcache, regnum, buf);
+ if (status == REG_VALID)
+ *val = extract_unsigned_integer
+ (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch));
+ else
+ *val = 0;
+ return status;
+}
- inferior_ptid = save_ptid;
+void
+regcache_cooked_write_signed (struct regcache *regcache, int regnum,
+ LONGEST val)
+{
+ void *buf;
- return retval;
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ store_signed_integer (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch), val);
+ regcache_cooked_write (regcache, regnum, buf);
}
-/* Return the contents of register REGNUM as a signed integer. */
-
-LONGEST
-read_signed_register (int regnum)
+void
+regcache_cooked_write_unsigned (struct regcache *regcache, int regnum,
+ ULONGEST val)
{
- void *buf = alloca (REGISTER_RAW_SIZE (regnum));
- read_register_gen (regnum, buf);
- return (extract_signed_integer (buf, REGISTER_RAW_SIZE (regnum)));
+ void *buf;
+
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers);
+ buf = alloca (regcache->descr->sizeof_register[regnum]);
+ store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum],
+ gdbarch_byte_order (regcache->descr->gdbarch), val);
+ regcache_cooked_write (regcache, regnum, buf);
}
-LONGEST
-read_signed_register_pid (int regnum, ptid_t ptid)
+void
+regcache_raw_write (struct regcache *regcache, int regnum,
+ const gdb_byte *buf)
{
- ptid_t save_ptid;
- LONGEST retval;
+ struct cleanup *old_chain;
- if (ptid_equal (ptid, inferior_ptid))
- return read_signed_register (regnum);
+ gdb_assert (regcache != NULL && buf != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
+ gdb_assert (!regcache->readonly_p);
- save_ptid = inferior_ptid;
+ /* On the sparc, writing %g0 is a no-op, so we don't even want to
+ change the registers array if something writes to this register. */
+ if (gdbarch_cannot_store_register (get_regcache_arch (regcache), regnum))
+ return;
- inferior_ptid = ptid;
+ /* If we have a valid copy of the register, and new value == old
+ value, then don't bother doing the actual store. */
+ if (regcache_register_status (regcache, regnum) == REG_VALID
+ && (memcmp (register_buffer (regcache, regnum), buf,
+ regcache->descr->sizeof_register[regnum]) == 0))
+ return;
- retval = read_signed_register (regnum);
+ old_chain = save_inferior_ptid ();
+ inferior_ptid = regcache->ptid;
- inferior_ptid = save_ptid;
+ target_prepare_to_store (regcache);
+ memcpy (register_buffer (regcache, regnum), buf,
+ regcache->descr->sizeof_register[regnum]);
+ regcache->register_status[regnum] = REG_VALID;
+ target_store_registers (regcache, regnum);
- return retval;
+ do_cleanups (old_chain);
}
-/* Store VALUE into the raw contents of register number REGNUM. */
-
void
-write_register (int regnum, LONGEST val)
+regcache_cooked_write (struct regcache *regcache, int regnum,
+ const gdb_byte *buf)
{
- void *buf;
- int size;
- size = REGISTER_RAW_SIZE (regnum);
- buf = alloca (size);
- store_signed_integer (buf, size, (LONGEST) val);
- write_register_gen (regnum, buf);
+ gdb_assert (regnum >= 0);
+ gdb_assert (regnum < regcache->descr->nr_cooked_registers);
+ if (regnum < regcache->descr->nr_raw_registers)
+ regcache_raw_write (regcache, regnum, buf);
+ else
+ gdbarch_pseudo_register_write (regcache->descr->gdbarch, regcache,
+ regnum, buf);
}
-void
-write_register_pid (int regnum, CORE_ADDR val, ptid_t ptid)
+/* Perform a partial register transfer using a read, modify, write
+ operation. */
+
+typedef void (regcache_read_ftype) (struct regcache *regcache, int regnum,
+ void *buf);
+typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum,
+ const void *buf);
+
+static enum register_status
+regcache_xfer_part (struct regcache *regcache, int regnum,
+ int offset, int len, void *in, const void *out,
+ enum register_status (*read) (struct regcache *regcache,
+ int regnum,
+ gdb_byte *buf),
+ void (*write) (struct regcache *regcache, int regnum,
+ const gdb_byte *buf))
{
- ptid_t save_ptid;
+ struct regcache_descr *descr = regcache->descr;
+ gdb_byte reg[MAX_REGISTER_SIZE];
+
+ gdb_assert (offset >= 0 && offset <= descr->sizeof_register[regnum]);
+ gdb_assert (len >= 0 && offset + len <= descr->sizeof_register[regnum]);
+ /* Something to do? */
+ if (offset + len == 0)
+ return REG_VALID;
+ /* Read (when needed) ... */
+ if (in != NULL
+ || offset > 0
+ || offset + len < descr->sizeof_register[regnum])
+ {
+ enum register_status status;
- if (ptid_equal (ptid, inferior_ptid))
+ gdb_assert (read != NULL);
+ status = read (regcache, regnum, reg);
+ if (status != REG_VALID)
+ return status;
+ }
+ /* ... modify ... */
+ if (in != NULL)
+ memcpy (in, reg + offset, len);
+ if (out != NULL)
+ memcpy (reg + offset, out, len);
+ /* ... write (when needed). */
+ if (out != NULL)
{
- write_register (regnum, val);
- return;
+ gdb_assert (write != NULL);
+ write (regcache, regnum, reg);
}
- save_ptid = inferior_ptid;
-
- inferior_ptid = ptid;
-
- write_register (regnum, val);
-
- inferior_ptid = save_ptid;
+ return REG_VALID;
}
-/* SUPPLY_REGISTER()
-
- Record that register REGNUM contains VAL. This is used when the
- value is obtained from the inferior or core dump, so there is no
- need to store the value there.
+enum register_status
+regcache_raw_read_part (struct regcache *regcache, int regnum,
+ int offset, int len, gdb_byte *buf)
+{
+ struct regcache_descr *descr = regcache->descr;
- If VAL is a NULL pointer, then it's probably an unsupported register.
- We just set its value to all zeros. We might want to record this
- fact, and report it to the users of read_register and friends. */
+ gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers);
+ return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL,
+ regcache_raw_read, regcache_raw_write);
+}
void
-supply_register (int regnum, char *val)
+regcache_raw_write_part (struct regcache *regcache, int regnum,
+ int offset, int len, const gdb_byte *buf)
{
-#if 1
- if (! ptid_equal (registers_ptid, inferior_ptid))
- {
- registers_changed ();
- registers_ptid = inferior_ptid;
- }
-#endif
+ struct regcache_descr *descr = regcache->descr;
- set_register_cached (regnum, 1);
- if (val)
- memcpy (register_buffer (regnum), val,
- REGISTER_RAW_SIZE (regnum));
- else
- memset (register_buffer (regnum), '\000',
- REGISTER_RAW_SIZE (regnum));
-
- /* On some architectures, e.g. HPPA, there are a few stray bits in
- some registers, that the rest of the code would like to ignore. */
+ gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers);
+ regcache_xfer_part (regcache, regnum, offset, len, NULL, buf,
+ regcache_raw_read, regcache_raw_write);
+}
- /* NOTE: cagney/2001-03-16: The macro CLEAN_UP_REGISTER_VALUE is
- going to be deprecated. Instead architectures will leave the raw
- register value as is and instead clean things up as they pass
- through the method gdbarch_register_read() clean up the
- values. */
+enum register_status
+regcache_cooked_read_part (struct regcache *regcache, int regnum,
+ int offset, int len, gdb_byte *buf)
+{
+ struct regcache_descr *descr = regcache->descr;
-#ifdef CLEAN_UP_REGISTER_VALUE
- CLEAN_UP_REGISTER_VALUE (regnum, register_buffer (regnum));
-#endif
+ gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
+ return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL,
+ regcache_cooked_read, regcache_cooked_write);
}
void
-regcache_collect (int regnum, void *buf)
+regcache_cooked_write_part (struct regcache *regcache, int regnum,
+ int offset, int len, const gdb_byte *buf)
{
- memcpy (buf, register_buffer (regnum), REGISTER_RAW_SIZE (regnum));
-}
+ struct regcache_descr *descr = regcache->descr;
+ gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
+ regcache_xfer_part (regcache, regnum, offset, len, NULL, buf,
+ regcache_cooked_read, regcache_cooked_write);
+}
-/* read_pc, write_pc, read_sp, write_sp, read_fp, write_fp, etc.
- Special handling for registers PC, SP, and FP. */
-
-/* NOTE: cagney/2001-02-18: The functions generic_target_read_pc(),
- read_pc_pid(), read_pc(), generic_target_write_pc(),
- write_pc_pid(), write_pc(), generic_target_read_sp(), read_sp(),
- generic_target_write_sp(), write_sp(), generic_target_read_fp(),
- read_fp(), generic_target_write_fp(), write_fp will eventually be
- moved out of the reg-cache into either frame.[hc] or to the
- multi-arch framework. The are not part of the raw register cache. */
+/* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */
-/* This routine is getting awfully cluttered with #if's. It's probably
- time to turn this into READ_PC and define it in the tm.h file.
- Ditto for write_pc.
+void
+regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf)
+{
+ void *regbuf;
+ size_t size;
- 1999-06-08: The following were re-written so that it assumes the
- existence of a TARGET_READ_PC et.al. macro. A default generic
- version of that macro is made available where needed.
+ gdb_assert (regcache != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
+ gdb_assert (!regcache->readonly_p);
- Since the ``TARGET_READ_PC'' et.al. macro is going to be controlled
- by the multi-arch framework, it will eventually be possible to
- eliminate the intermediate read_pc_pid(). The client would call
- TARGET_READ_PC directly. (cagney). */
+ regbuf = register_buffer (regcache, regnum);
+ size = regcache->descr->sizeof_register[regnum];
-CORE_ADDR
-generic_target_read_pc (ptid_t ptid)
-{
-#ifdef PC_REGNUM
- if (PC_REGNUM >= 0)
+ if (buf)
{
- CORE_ADDR pc_val = ADDR_BITS_REMOVE ((CORE_ADDR) read_register_pid (PC_REGNUM, ptid));
- return pc_val;
+ memcpy (regbuf, buf, size);
+ regcache->register_status[regnum] = REG_VALID;
+ }
+ else
+ {
+ /* This memset not strictly necessary, but better than garbage
+ in case the register value manages to escape somewhere (due
+ to a bug, no less). */
+ memset (regbuf, 0, size);
+ regcache->register_status[regnum] = REG_UNAVAILABLE;
}
-#endif
- internal_error (__FILE__, __LINE__,
- "generic_target_read_pc");
- return 0;
}
-CORE_ADDR
-read_pc_pid (ptid_t ptid)
-{
- ptid_t saved_inferior_ptid;
- CORE_ADDR pc_val;
+/* Collect register REGNUM from REGCACHE and store its contents in BUF. */
- /* In case ptid != inferior_ptid. */
- saved_inferior_ptid = inferior_ptid;
- inferior_ptid = ptid;
+void
+regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf)
+{
+ const void *regbuf;
+ size_t size;
- pc_val = TARGET_READ_PC (ptid);
+ gdb_assert (regcache != NULL && buf != NULL);
+ gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
- inferior_ptid = saved_inferior_ptid;
- return pc_val;
+ regbuf = register_buffer (regcache, regnum);
+ size = regcache->descr->sizeof_register[regnum];
+ memcpy (buf, regbuf, size);
}
-CORE_ADDR
-read_pc (void)
-{
- return read_pc_pid (inferior_ptid);
-}
-void
-generic_target_write_pc (CORE_ADDR pc, ptid_t ptid)
-{
-#ifdef PC_REGNUM
- if (PC_REGNUM >= 0)
- write_register_pid (PC_REGNUM, pc, ptid);
- if (NPC_REGNUM >= 0)
- write_register_pid (NPC_REGNUM, pc + 4, ptid);
- if (NNPC_REGNUM >= 0)
- write_register_pid (NNPC_REGNUM, pc + 8, ptid);
-#else
- internal_error (__FILE__, __LINE__,
- "generic_target_write_pc");
-#endif
-}
+/* Special handling for register PC. */
-void
-write_pc_pid (CORE_ADDR pc, ptid_t ptid)
+CORE_ADDR
+regcache_read_pc (struct regcache *regcache)
{
- ptid_t saved_inferior_ptid;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
- /* In case ptid != inferior_ptid. */
- saved_inferior_ptid = inferior_ptid;
- inferior_ptid = ptid;
+ CORE_ADDR pc_val;
- TARGET_WRITE_PC (pc, ptid);
+ if (gdbarch_read_pc_p (gdbarch))
+ pc_val = gdbarch_read_pc (gdbarch, regcache);
+ /* Else use per-frame method on get_current_frame. */
+ else if (gdbarch_pc_regnum (gdbarch) >= 0)
+ {
+ ULONGEST raw_val;
+
+ if (regcache_cooked_read_unsigned (regcache,
+ gdbarch_pc_regnum (gdbarch),
+ &raw_val) == REG_UNAVAILABLE)
+ throw_error (NOT_AVAILABLE_ERROR, _("PC register is not available"));
- inferior_ptid = saved_inferior_ptid;
+ pc_val = gdbarch_addr_bits_remove (gdbarch, raw_val);
+ }
+ else
+ internal_error (__FILE__, __LINE__,
+ _("regcache_read_pc: Unable to find PC"));
+ return pc_val;
}
void
-write_pc (CORE_ADDR pc)
+regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- write_pc_pid (pc, inferior_ptid);
-}
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
-/* Cope with strage ways of getting to the stack and frame pointers */
+ if (gdbarch_write_pc_p (gdbarch))
+ gdbarch_write_pc (gdbarch, regcache, pc);
+ else if (gdbarch_pc_regnum (gdbarch) >= 0)
+ regcache_cooked_write_unsigned (regcache,
+ gdbarch_pc_regnum (gdbarch), pc);
+ else
+ internal_error (__FILE__, __LINE__,
+ _("regcache_write_pc: Unable to update PC"));
-CORE_ADDR
-generic_target_read_sp (void)
-{
-#ifdef SP_REGNUM
- if (SP_REGNUM >= 0)
- return read_register (SP_REGNUM);
-#endif
- internal_error (__FILE__, __LINE__,
- "generic_target_read_sp");
+ /* Writing the PC (for instance, from "load") invalidates the
+ current frame. */
+ reinit_frame_cache ();
}
-CORE_ADDR
-read_sp (void)
+
+static void
+reg_flush_command (char *command, int from_tty)
{
- return TARGET_READ_SP ();
+ /* Force-flush the register cache. */
+ registers_changed ();
+ if (from_tty)
+ printf_filtered (_("Register cache flushed.\n"));
}
-void
-generic_target_write_sp (CORE_ADDR val)
+static void
+dump_endian_bytes (struct ui_file *file, enum bfd_endian endian,
+ const unsigned char *buf, long len)
{
-#ifdef SP_REGNUM
- if (SP_REGNUM >= 0)
+ int i;
+
+ switch (endian)
{
- write_register (SP_REGNUM, val);
- return;
+ case BFD_ENDIAN_BIG:
+ for (i = 0; i < len; i++)
+ fprintf_unfiltered (file, "%02x", buf[i]);
+ break;
+ case BFD_ENDIAN_LITTLE:
+ for (i = len - 1; i >= 0; i--)
+ fprintf_unfiltered (file, "%02x", buf[i]);
+ break;
+ default:
+ internal_error (__FILE__, __LINE__, _("Bad switch"));
}
-#endif
- internal_error (__FILE__, __LINE__,
- "generic_target_write_sp");
}
-void
-write_sp (CORE_ADDR val)
+enum regcache_dump_what
{
- TARGET_WRITE_SP (val);
-}
+ regcache_dump_none, regcache_dump_raw,
+ regcache_dump_cooked, regcache_dump_groups,
+ regcache_dump_remote
+};
-CORE_ADDR
-generic_target_read_fp (void)
+static void
+regcache_dump (struct regcache *regcache, struct ui_file *file,
+ enum regcache_dump_what what_to_dump)
{
-#ifdef FP_REGNUM
- if (FP_REGNUM >= 0)
- return read_register (FP_REGNUM);
+ struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
+ struct gdbarch *gdbarch = regcache->descr->gdbarch;
+ int regnum;
+ int footnote_nr = 0;
+ int footnote_register_size = 0;
+ int footnote_register_offset = 0;
+ int footnote_register_type_name_null = 0;
+ long register_offset = 0;
+ unsigned char buf[MAX_REGISTER_SIZE];
+
+#if 0
+ fprintf_unfiltered (file, "nr_raw_registers %d\n",
+ regcache->descr->nr_raw_registers);
+ fprintf_unfiltered (file, "nr_cooked_registers %d\n",
+ regcache->descr->nr_cooked_registers);
+ fprintf_unfiltered (file, "sizeof_raw_registers %ld\n",
+ regcache->descr->sizeof_raw_registers);
+ fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n",
+ regcache->descr->sizeof_raw_register_status);
+ fprintf_unfiltered (file, "gdbarch_num_regs %d\n",
+ gdbarch_num_regs (gdbarch));
+ fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n",
+ gdbarch_num_pseudo_regs (gdbarch));
#endif
- internal_error (__FILE__, __LINE__,
- "generic_target_read_fp");
-}
-CORE_ADDR
-read_fp (void)
-{
- return TARGET_READ_FP ();
+ gdb_assert (regcache->descr->nr_cooked_registers
+ == (gdbarch_num_regs (gdbarch)
+ + gdbarch_num_pseudo_regs (gdbarch)));
+
+ for (regnum = -1; regnum < regcache->descr->nr_cooked_registers; regnum++)
+ {
+ /* Name. */
+ if (regnum < 0)
+ fprintf_unfiltered (file, " %-10s", "Name");
+ else
+ {
+ const char *p = gdbarch_register_name (gdbarch, regnum);
+
+ if (p == NULL)
+ p = "";
+ else if (p[0] == '\0')
+ p = "''";
+ fprintf_unfiltered (file, " %-10s", p);
+ }
+
+ /* Number. */
+ if (regnum < 0)
+ fprintf_unfiltered (file, " %4s", "Nr");
+ else
+ fprintf_unfiltered (file, " %4d", regnum);
+
+ /* Relative number. */
+ if (regnum < 0)
+ fprintf_unfiltered (file, " %4s", "Rel");
+ else if (regnum < gdbarch_num_regs (gdbarch))
+ fprintf_unfiltered (file, " %4d", regnum);
+ else
+ fprintf_unfiltered (file, " %4d",
+ (regnum - gdbarch_num_regs (gdbarch)));
+
+ /* Offset. */
+ if (regnum < 0)
+ fprintf_unfiltered (file, " %6s ", "Offset");
+ else
+ {
+ fprintf_unfiltered (file, " %6ld",
+ regcache->descr->register_offset[regnum]);
+ if (register_offset != regcache->descr->register_offset[regnum]
+ || (regnum > 0
+ && (regcache->descr->register_offset[regnum]
+ != (regcache->descr->register_offset[regnum - 1]
+ + regcache->descr->sizeof_register[regnum - 1])))
+ )
+ {
+ if (!footnote_register_offset)
+ footnote_register_offset = ++footnote_nr;
+ fprintf_unfiltered (file, "*%d", footnote_register_offset);
+ }
+ else
+ fprintf_unfiltered (file, " ");
+ register_offset = (regcache->descr->register_offset[regnum]
+ + regcache->descr->sizeof_register[regnum]);
+ }
+
+ /* Size. */
+ if (regnum < 0)
+ fprintf_unfiltered (file, " %5s ", "Size");
+ else
+ fprintf_unfiltered (file, " %5ld",
+ regcache->descr->sizeof_register[regnum]);
+
+ /* Type. */
+ {
+ const char *t;
+
+ if (regnum < 0)
+ t = "Type";
+ else
+ {
+ static const char blt[] = "builtin_type";
+
+ t = TYPE_NAME (register_type (regcache->descr->gdbarch, regnum));
+ if (t == NULL)
+ {
+ char *n;
+
+ if (!footnote_register_type_name_null)
+ footnote_register_type_name_null = ++footnote_nr;
+ n = xstrprintf ("*%d", footnote_register_type_name_null);
+ make_cleanup (xfree, n);
+ t = n;
+ }
+ /* Chop a leading builtin_type. */
+ if (strncmp (t, blt, strlen (blt)) == 0)
+ t += strlen (blt);
+ }
+ fprintf_unfiltered (file, " %-15s", t);
+ }
+
+ /* Leading space always present. */
+ fprintf_unfiltered (file, " ");
+
+ /* Value, raw. */
+ if (what_to_dump == regcache_dump_raw)
+ {
+ if (regnum < 0)
+ fprintf_unfiltered (file, "Raw value");
+ else if (regnum >= regcache->descr->nr_raw_registers)
+ fprintf_unfiltered (file, "<cooked>");
+ else if (regcache_register_status (regcache, regnum) == REG_UNKNOWN)
+ fprintf_unfiltered (file, "<invalid>");
+ else if (regcache_register_status (regcache, regnum) == REG_UNAVAILABLE)
+ fprintf_unfiltered (file, "<unavailable>");
+ else
+ {
+ regcache_raw_read (regcache, regnum, buf);
+ fprintf_unfiltered (file, "0x");
+ dump_endian_bytes (file,
+ gdbarch_byte_order (gdbarch), buf,
+ regcache->descr->sizeof_register[regnum]);
+ }
+ }
+
+ /* Value, cooked. */
+ if (what_to_dump == regcache_dump_cooked)
+ {
+ if (regnum < 0)
+ fprintf_unfiltered (file, "Cooked value");
+ else
+ {
+ enum register_status status;
+
+ status = regcache_cooked_read (regcache, regnum, buf);
+ if (status == REG_UNKNOWN)
+ fprintf_unfiltered (file, "<invalid>");
+ else if (status == REG_UNAVAILABLE)
+ fprintf_unfiltered (file, "<unavailable>");
+ else
+ {
+ fprintf_unfiltered (file, "0x");
+ dump_endian_bytes (file,
+ gdbarch_byte_order (gdbarch), buf,
+ regcache->descr->sizeof_register[regnum]);
+ }
+ }
+ }
+
+ /* Group members. */
+ if (what_to_dump == regcache_dump_groups)
+ {
+ if (regnum < 0)
+ fprintf_unfiltered (file, "Groups");
+ else
+ {
+ const char *sep = "";
+ struct reggroup *group;
+
+ for (group = reggroup_next (gdbarch, NULL);
+ group != NULL;
+ group = reggroup_next (gdbarch, group))
+ {
+ if (gdbarch_register_reggroup_p (gdbarch, regnum, group))
+ {
+ fprintf_unfiltered (file,
+ "%s%s", sep, reggroup_name (group));
+ sep = ",";
+ }
+ }
+ }
+ }
+
+ /* Remote packet configuration. */
+ if (what_to_dump == regcache_dump_remote)
+ {
+ if (regnum < 0)
+ {
+ fprintf_unfiltered (file, "Rmt Nr g/G Offset");
+ }
+ else if (regnum < regcache->descr->nr_raw_registers)
+ {
+ int pnum, poffset;
+
+ if (remote_register_number_and_offset (get_regcache_arch (regcache), regnum,
+ &pnum, &poffset))
+ fprintf_unfiltered (file, "%7d %11d", pnum, poffset);
+ }
+ }
+
+ fprintf_unfiltered (file, "\n");
+ }
+
+ if (footnote_register_size)
+ fprintf_unfiltered (file, "*%d: Inconsistent register sizes.\n",
+ footnote_register_size);
+ if (footnote_register_offset)
+ fprintf_unfiltered (file, "*%d: Inconsistent register offsets.\n",
+ footnote_register_offset);
+ if (footnote_register_type_name_null)
+ fprintf_unfiltered (file,
+ "*%d: Register type's name NULL.\n",
+ footnote_register_type_name_null);
+ do_cleanups (cleanups);
}
-void
-generic_target_write_fp (CORE_ADDR val)
+static void
+regcache_print (char *args, enum regcache_dump_what what_to_dump)
{
-#ifdef FP_REGNUM
- if (FP_REGNUM >= 0)
+ if (args == NULL)
+ regcache_dump (get_current_regcache (), gdb_stdout, what_to_dump);
+ else
{
- write_register (FP_REGNUM, val);
- return;
+ struct cleanup *cleanups;
+ struct ui_file *file = gdb_fopen (args, "w");
+
+ if (file == NULL)
+ perror_with_name (_("maintenance print architecture"));
+ cleanups = make_cleanup_ui_file_delete (file);
+ regcache_dump (get_current_regcache (), file, what_to_dump);
+ do_cleanups (cleanups);
}
-#endif
- internal_error (__FILE__, __LINE__,
- "generic_target_write_fp");
}
-void
-write_fp (CORE_ADDR val)
+static void
+maintenance_print_registers (char *args, int from_tty)
{
- TARGET_WRITE_FP (val);
+ regcache_print (args, regcache_dump_none);
}
-/* ARGSUSED */
static void
-reg_flush_command (char *command, int from_tty)
+maintenance_print_raw_registers (char *args, int from_tty)
{
- /* Force-flush the register cache. */
- registers_changed ();
- if (from_tty)
- printf_filtered ("Register cache flushed.\n");
+ regcache_print (args, regcache_dump_raw);
+}
+
+static void
+maintenance_print_cooked_registers (char *args, int from_tty)
+{
+ regcache_print (args, regcache_dump_cooked);
}
-#undef XCALLOC
-#define XCALLOC(NR,TYPE) ((TYPE*) xcalloc ((NR), sizeof (TYPE)))
+static void
+maintenance_print_register_groups (char *args, int from_tty)
+{
+ regcache_print (args, regcache_dump_groups);
+}
static void
-build_regcache (void)
+maintenance_print_remote_registers (char *args, int from_tty)
{
- int i;
- int sizeof_register_valid;
- /* Come up with the real size of the registers buffer. */
- int sizeof_registers = REGISTER_BYTES; /* OK use. */
- for (i = 0; i < NUM_REGS + NUM_PSEUDO_REGS; i++)
- {
- long regend;
- /* Keep extending the buffer so that there is always enough
- space for all registers. The comparison is necessary since
- legacy code is free to put registers in random places in the
- buffer separated by holes. Once REGISTER_BYTE() is killed
- this can be greatly simplified. */
- /* FIXME: cagney/2001-12-04: This code shouldn't need to use
- REGISTER_BYTE(). Unfortunatly, legacy code likes to lay the
- buffer out so that certain registers just happen to overlap.
- Ulgh! New targets use gdbarch's register read/write and
- entirely avoid this uglyness. */
- regend = REGISTER_BYTE (i) + REGISTER_RAW_SIZE (i);
- if (sizeof_registers < regend)
- sizeof_registers = regend;
- }
- registers = xmalloc (sizeof_registers);
- sizeof_register_valid = ((NUM_REGS + NUM_PSEUDO_REGS)
- * sizeof (*register_valid));
- register_valid = xmalloc (sizeof_register_valid);
- memset (register_valid, 0, sizeof_register_valid);
+ regcache_print (args, regcache_dump_remote);
}
+extern initialize_file_ftype _initialize_regcache; /* -Wmissing-prototype */
+
void
_initialize_regcache (void)
{
- build_regcache ();
+ regcache_descr_handle
+ = gdbarch_data_register_post_init (init_regcache_descr);
- register_gdbarch_swap (®isters, sizeof (registers), NULL);
- register_gdbarch_swap (®ister_valid, sizeof (register_valid), NULL);
- register_gdbarch_swap (NULL, 0, build_regcache);
+ observer_attach_target_changed (regcache_observer_target_changed);
+ observer_attach_thread_ptid_changed (regcache_thread_ptid_changed);
add_com ("flushregs", class_maintenance, reg_flush_command,
- "Force gdb to flush its register cache (maintainer command)");
+ _("Force gdb to flush its register cache (maintainer command)"));
+
+ add_cmd ("registers", class_maintenance, maintenance_print_registers,
+ _("Print the internal register configuration.\n"
+ "Takes an optional file parameter."), &maintenanceprintlist);
+ add_cmd ("raw-registers", class_maintenance,
+ maintenance_print_raw_registers,
+ _("Print the internal register configuration "
+ "including raw values.\n"
+ "Takes an optional file parameter."), &maintenanceprintlist);
+ add_cmd ("cooked-registers", class_maintenance,
+ maintenance_print_cooked_registers,
+ _("Print the internal register configuration "
+ "including cooked values.\n"
+ "Takes an optional file parameter."), &maintenanceprintlist);
+ add_cmd ("register-groups", class_maintenance,
+ maintenance_print_register_groups,
+ _("Print the internal register configuration "
+ "including each register's group.\n"
+ "Takes an optional file parameter."),
+ &maintenanceprintlist);
+ add_cmd ("remote-registers", class_maintenance,
+ maintenance_print_remote_registers, _("\
+Print the internal register configuration including each register's\n\
+remote register number and buffer offset in the g/G packets.\n\
+Takes an optional file parameter."),
+ &maintenanceprintlist);
- /* Initialize the thread/process associated with the current set of
- registers. For now, -1 is special, and means `no current process'. */
- registers_ptid = pid_to_ptid (-1);
}
projects / deliverable / binutils-gdb.git / blobdiff