old-cross-binutils/gdb/gdbserver/regcache.c
Joel Brobecker 0b30217134 Copyright year update in most files of the GDB Project.
gdb/ChangeLog:

        Copyright year update in most files of the GDB Project.
2012-01-04 08:17:56 +00:00

430 lines
9.5 KiB
C

/* Register support routines for the remote server for GDB.
Copyright (C) 2001-2002, 2004-2005, 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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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, see <http://www.gnu.org/licenses/>. */
#include "server.h"
#include "regdef.h"
#include <stdlib.h>
#include <string.h>
static int register_bytes;
static struct reg *reg_defs;
static int num_registers;
const char **gdbserver_expedite_regs;
#ifndef IN_PROCESS_AGENT
struct regcache *
get_thread_regcache (struct thread_info *thread, int fetch)
{
struct regcache *regcache;
regcache = (struct regcache *) inferior_regcache_data (thread);
if (regcache == NULL)
fatal ("no register cache");
if (fetch && regcache->registers_valid == 0)
{
struct thread_info *saved_inferior = current_inferior;
current_inferior = thread;
fetch_inferior_registers (regcache, -1);
current_inferior = saved_inferior;
regcache->registers_valid = 1;
}
return regcache;
}
void
regcache_invalidate_one (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
struct regcache *regcache;
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 (regcache, -1);
current_inferior = saved_inferior;
}
regcache->registers_valid = 0;
}
void
regcache_invalidate (void)
{
for_each_inferior (&all_threads, regcache_invalidate_one);
}
#endif
struct regcache *
init_register_cache (struct regcache *regcache, unsigned char *regbuf)
{
#ifndef IN_PROCESS_AGENT
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;
regcache->register_status = xcalloc (1, num_registers);
gdb_assert (REG_UNAVAILABLE == 0);
}
else
#else
if (regbuf == NULL)
fatal ("init_register_cache: can't allocate memory from the heap");
else
#endif
{
regcache->registers = regbuf;
regcache->registers_owned = 0;
#ifndef IN_PROCESS_AGENT
regcache->register_status = NULL;
#endif
}
regcache->registers_valid = 0;
return regcache;
}
#ifndef IN_PROCESS_AGENT
struct regcache *
new_register_cache (void)
{
struct regcache *regcache;
if (register_bytes == 0)
return NULL; /* The architecture hasn't been initialized yet. */
regcache = xmalloc (sizeof (*regcache));
return init_register_cache (regcache, NULL);
}
void
free_register_cache (struct regcache *regcache)
{
if (regcache)
{
if (regcache->registers_owned)
free (regcache->registers);
free (regcache->register_status);
free (regcache);
}
}
#endif
void
regcache_cpy (struct regcache *dst, struct regcache *src)
{
memcpy (dst->registers, src->registers, register_bytes);
#ifndef IN_PROCESS_AGENT
if (dst->register_status != NULL && src->register_status != NULL)
memcpy (dst->register_status, src->register_status, num_registers);
#endif
dst->registers_valid = src->registers_valid;
}
#ifndef IN_PROCESS_AGENT
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 ());
}
#endif
void
set_register_cache (struct reg *regs, int n)
{
int offset, i;
#ifndef IN_PROCESS_AGENT
/* Before changing the register cache internal layout, flush the
contents of valid caches back to the threads. */
regcache_invalidate ();
#endif
reg_defs = regs;
num_registers = n;
offset = 0;
for (i = 0; i < n; i++)
{
regs[i].offset = offset;
offset += regs[i].size;
}
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.");
#ifndef IN_PROCESS_AGENT
/* Re-allocate all pre-existing register caches. */
for_each_inferior (&all_threads, realloc_register_cache);
#endif
}
int
register_cache_size (void)
{
return register_bytes;
}
#ifndef IN_PROCESS_AGENT
void
registers_to_string (struct regcache *regcache, char *buf)
{
unsigned char *registers = regcache->registers;
int i;
for (i = 0; i < num_registers; i++)
{
if (regcache->register_status[i] == REG_VALID)
{
convert_int_to_ascii (registers, buf, register_size (i));
buf += register_size (i) * 2;
}
else
{
memset (buf, 'x', register_size (i) * 2);
buf += register_size (i) * 2;
}
registers += register_size (i);
}
*buf = '\0';
}
void
registers_from_string (struct regcache *regcache, char *buf)
{
int len = strlen (buf);
unsigned char *registers = regcache->registers;
if (len != register_bytes * 2)
{
warning ("Wrong sized register packet (expected %d bytes, got %d)",
2*register_bytes, len);
if (len > register_bytes * 2)
len = register_bytes * 2;
}
convert_ascii_to_int (buf, registers, len / 2);
}
struct reg *
find_register_by_name (const char *name)
{
int i;
for (i = 0; i < num_registers; i++)
if (!strcmp (name, reg_defs[i].name))
return &reg_defs[i];
fatal ("Unknown register %s requested", name);
return 0;
}
int
find_regno (const char *name)
{
int i;
for (i = 0; i < num_registers; i++)
if (!strcmp (name, reg_defs[i].name))
return i;
fatal ("Unknown register %s requested", name);
return -1;
}
struct reg *
find_register_by_number (int n)
{
return &reg_defs[n];
}
#endif
int
register_size (int n)
{
return reg_defs[n].size / 8;
}
static unsigned char *
register_data (struct regcache *regcache, int n, int fetch)
{
return regcache->registers + (reg_defs[n].offset / 8);
}
/* Supply register N, whose contents are stored in BUF, to REGCACHE.
If BUF is NULL, the register's value is recorded as
unavailable. */
void
supply_register (struct regcache *regcache, int n, const void *buf)
{
if (buf)
{
memcpy (register_data (regcache, n, 0), buf, register_size (n));
#ifndef IN_PROCESS_AGENT
if (regcache->register_status != NULL)
regcache->register_status[n] = REG_VALID;
#endif
}
else
{
memset (register_data (regcache, n, 0), 0, register_size (n));
#ifndef IN_PROCESS_AGENT
if (regcache->register_status != NULL)
regcache->register_status[n] = REG_UNAVAILABLE;
#endif
}
}
/* Supply register N with value zero to REGCACHE. */
void
supply_register_zeroed (struct regcache *regcache, int n)
{
memset (register_data (regcache, n, 0), 0, register_size (n));
#ifndef IN_PROCESS_AGENT
if (regcache->register_status != NULL)
regcache->register_status[n] = REG_VALID;
#endif
}
/* Supply the whole register set whose contents are stored in BUF, to
REGCACHE. If BUF is NULL, all the registers' values are recorded
as unavailable. */
void
supply_regblock (struct regcache *regcache, const void *buf)
{
if (buf)
{
memcpy (regcache->registers, buf, register_bytes);
#ifndef IN_PROCESS_AGENT
{
int i;
for (i = 0; i < num_registers; i++)
regcache->register_status[i] = REG_VALID;
}
#endif
}
else
{
memset (regcache->registers, 0, register_bytes);
#ifndef IN_PROCESS_AGENT
{
int i;
for (i = 0; i < num_registers; i++)
regcache->register_status[i] = REG_UNAVAILABLE;
}
#endif
}
}
#ifndef IN_PROCESS_AGENT
void
supply_register_by_name (struct regcache *regcache,
const char *name, const void *buf)
{
supply_register (regcache, find_regno (name), buf);
}
#endif
void
collect_register (struct regcache *regcache, int n, void *buf)
{
memcpy (buf, register_data (regcache, n, 1), register_size (n));
}
#ifndef IN_PROCESS_AGENT
void
collect_register_as_string (struct regcache *regcache, int n, char *buf)
{
convert_int_to_ascii (register_data (regcache, n, 1),
buf, register_size (n));
}
void
collect_register_by_name (struct regcache *regcache,
const char *name, void *buf)
{
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
regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
if (the_target->write_pc)
the_target->write_pc (regcache, pc);
else
internal_error (__FILE__, __LINE__,
"regcache_write_pc: Unable to update PC");
}
#endif