/* Register support routines for the remote server for GDB.
- Copyright (C) 2001, 2002, 2004, 2005
+ Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010
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/>. */
#include "server.h"
#include "regdef.h"
#include <stdlib.h>
#include <string.h>
-/* The private data for the register cache. Note that we have one
- per inferior; this is primarily for simplicity, as the performance
- benefit is minimal. */
-
-struct inferior_regcache_data
-{
- int registers_valid;
- unsigned char *registers;
-};
-
static int register_bytes;
static struct reg *reg_defs;
const char **gdbserver_expedite_regs;
-static struct inferior_regcache_data *
-get_regcache (struct thread_info *inf, int fetch)
+struct regcache *
+get_thread_regcache (struct thread_info *thread, int fetch)
{
- struct inferior_regcache_data *regcache;
+ struct regcache *regcache;
- regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf);
+ regcache = (struct regcache *) inferior_regcache_data (thread);
if (regcache == NULL)
fatal ("no register cache");
- /* FIXME - fetch registers for INF */
if (fetch && regcache->registers_valid == 0)
{
- fetch_inferior_registers (0);
+ struct thread_info *saved_inferior = current_inferior;
+
+ current_inferior = thread;
+ fetch_inferior_registers (regcache, -1);
+ current_inferior = saved_inferior;
regcache->registers_valid = 1;
}
regcache_invalidate_one (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
- struct inferior_regcache_data *regcache;
+ struct regcache *regcache;
- regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread);
+ regcache = (struct regcache *) inferior_regcache_data (thread);
+
+ if (regcache == NULL)
+ return;
if (regcache->registers_valid)
{
struct thread_info *saved_inferior = current_inferior;
current_inferior = thread;
- store_inferior_registers (-1);
+ store_inferior_registers (regcache, -1);
current_inferior = saved_inferior;
}
}
void
-regcache_invalidate ()
+regcache_invalidate (void)
{
for_each_inferior (&all_threads, regcache_invalidate_one);
}
-int
-registers_length (void)
+struct regcache *
+init_register_cache (struct regcache *regcache, unsigned char *regbuf)
{
- return 2 * register_bytes;
+ if (regbuf == NULL)
+ {
+ /* Make sure to zero-initialize the register cache when it is
+ created, in case there are registers the target never
+ fetches. This way they'll read as zero instead of
+ garbage. */
+ regcache->registers = xcalloc (1, register_bytes);
+ regcache->registers_owned = 1;
+ }
+ else
+ {
+ regcache->registers = regbuf;
+ regcache->registers_owned = 0;
+ }
+
+ regcache->registers_valid = 0;
+
+ return regcache;
}
-void *
+struct regcache *
new_register_cache (void)
{
- struct inferior_regcache_data *regcache;
-
- regcache = malloc (sizeof (*regcache));
+ struct regcache *regcache;
- /* Make sure to zero-initialize the register cache when it is created,
- in case there are registers the target never fetches. This way they'll
- read as zero instead of garbage. */
- regcache->registers = calloc (1, register_bytes);
- if (regcache->registers == NULL)
- fatal ("Could not allocate register cache.");
+ if (register_bytes == 0)
+ return NULL; /* The architecture hasn't been initialized yet. */
- regcache->registers_valid = 0;
+ regcache = xmalloc (sizeof (*regcache));
+ return init_register_cache (regcache, NULL);
+}
- return regcache;
+void
+free_register_cache (struct regcache *regcache)
+{
+ if (regcache)
+ {
+ free (regcache->registers);
+ free (regcache);
+ }
}
void
-free_register_cache (void *regcache_p)
+regcache_cpy (struct regcache *dst, struct regcache *src)
{
- struct inferior_regcache_data *regcache
- = (struct inferior_regcache_data *) regcache_p;
+ memcpy (dst->registers, src->registers, register_bytes);
+ dst->registers_valid = src->registers_valid;
+}
- free (regcache->registers);
- free (regcache);
+static void
+realloc_register_cache (struct inferior_list_entry *thread_p)
+{
+ struct thread_info *thread = (struct thread_info *) thread_p;
+ struct regcache *regcache
+ = (struct regcache *) inferior_regcache_data (thread);
+
+ if (regcache != NULL)
+ regcache_invalidate_one (thread_p);
+ free_register_cache (regcache);
+ set_inferior_regcache_data (thread, new_register_cache ());
}
void
set_register_cache (struct reg *regs, int n)
{
int offset, i;
-
+
+ /* Before changing the register cache internal layout, flush the
+ contents of valid caches back to the threads. */
+ regcache_invalidate ();
+
reg_defs = regs;
num_registers = n;
}
register_bytes = offset / 8;
+
+ /* Make sure PBUFSIZ is large enough to hold a full register packet. */
+ if (2 * register_bytes + 32 > PBUFSIZ)
+ fatal ("Register packet size exceeds PBUFSIZ.");
+
+ /* Re-allocate all pre-existing register caches. */
+ for_each_inferior (&all_threads, realloc_register_cache);
+}
+
+int
+register_cache_size (void)
+{
+ return register_bytes;
}
void
-registers_to_string (char *buf)
+registers_to_string (struct regcache *regcache, char *buf)
{
- unsigned char *registers = get_regcache (current_inferior, 1)->registers;
+ unsigned char *registers = regcache->registers;
convert_int_to_ascii (registers, buf, register_bytes);
}
void
-registers_from_string (char *buf)
+registers_from_string (struct regcache *regcache, char *buf)
{
int len = strlen (buf);
- unsigned char *registers = get_regcache (current_inferior, 1)->registers;
+ unsigned char *registers = regcache->registers;
if (len != register_bytes * 2)
{
- warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len);
+ warning ("Wrong sized register packet (expected %d bytes, got %d)",
+ 2*register_bytes, len);
if (len > register_bytes * 2)
len = register_bytes * 2;
}
}
static unsigned char *
-register_data (int n, int fetch)
+register_data (struct regcache *regcache, int n, int fetch)
+{
+ return regcache->registers + (reg_defs[n].offset / 8);
+}
+
+void
+supply_register (struct regcache *regcache, int n, const void *buf)
{
- unsigned char *registers
- = get_regcache (current_inferior, fetch)->registers;
+ if (buf)
+ memcpy (register_data (regcache, n, 0), buf, register_size (n));
+ else
+ memset (register_data (regcache, n, 0), 0, register_size (n));
+}
- return registers + (reg_defs[n].offset / 8);
+void
+supply_regblock (struct regcache *regcache, const void *buf)
+{
+ if (buf)
+ memcpy (regcache->registers, buf, register_bytes);
+ else
+ memset (regcache->registers, 0, register_bytes);
}
void
-supply_register (int n, const void *buf)
+supply_register_by_name (struct regcache *regcache,
+ const char *name, const void *buf)
{
- memcpy (register_data (n, 0), buf, register_size (n));
+ supply_register (regcache, find_regno (name), buf);
}
void
-supply_register_by_name (const char *name, const void *buf)
+collect_register (struct regcache *regcache, int n, void *buf)
{
- supply_register (find_regno (name), buf);
+ memcpy (buf, register_data (regcache, n, 1), register_size (n));
}
void
-collect_register (int n, void *buf)
+collect_register_as_string (struct regcache *regcache, int n, char *buf)
{
- memcpy (buf, register_data (n, 1), register_size (n));
+ convert_int_to_ascii (register_data (regcache, n, 1),
+ buf, register_size (n));
}
void
-collect_register_as_string (int n, char *buf)
+collect_register_by_name (struct regcache *regcache,
+ const char *name, void *buf)
{
- convert_int_to_ascii (register_data (n, 1), buf, register_size (n));
+ collect_register (regcache, find_regno (name), buf);
+}
+
+/* Special handling for register PC. */
+
+CORE_ADDR
+regcache_read_pc (struct regcache *regcache)
+{
+ CORE_ADDR pc_val;
+
+ if (the_target->read_pc)
+ pc_val = the_target->read_pc (regcache);
+ else
+ internal_error (__FILE__, __LINE__,
+ "regcache_read_pc: Unable to find PC");
+
+ return pc_val;
}
void
-collect_register_by_name (const char *name, void *buf)
+regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
- collect_register (find_regno (name), buf);
+ if (the_target->write_pc)
+ the_target->write_pc (regcache, pc);
+ else
+ internal_error (__FILE__, __LINE__,
+ "regcache_write_pc: Unable to update PC");
}