binutils-gdb/gdb/gdbserver/regcache.c

503 lines
12 KiB
C

/* Register support routines for the remote server for GDB.
Copyright (C) 2001-2015 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 "gdbthread.h"
#include "tdesc.h"
#include "rsp-low.h"
#ifndef IN_PROCESS_AGENT
struct regcache *
get_thread_regcache (struct thread_info *thread, int fetch)
{
struct regcache *regcache;
regcache = inferior_regcache_data (thread);
/* Threads' regcaches are created lazily, because biarch targets add
the main thread/lwp before seeing it stop for the first time, and
it is only after the target sees the thread stop for the first
time that the target has a chance of determining the process's
architecture. IOW, when we first add the process's main thread
we don't know which architecture/tdesc its regcache should
have. */
if (regcache == NULL)
{
struct process_info *proc = get_thread_process (thread);
gdb_assert (proc->tdesc != NULL);
regcache = new_register_cache (proc->tdesc);
set_inferior_regcache_data (thread, regcache);
}
if (fetch && regcache->registers_valid == 0)
{
struct thread_info *saved_thread = current_thread;
current_thread = thread;
/* Invalidate all registers, to prevent stale left-overs. */
memset (regcache->register_status, REG_UNAVAILABLE,
regcache->tdesc->num_registers);
fetch_inferior_registers (regcache, -1);
current_thread = saved_thread;
regcache->registers_valid = 1;
}
return regcache;
}
/* See common/common-regcache.h. */
struct regcache *
get_thread_regcache_for_ptid (ptid_t ptid)
{
return get_thread_regcache (find_thread_ptid (ptid), 1);
}
void
regcache_invalidate_thread (struct thread_info *thread)
{
struct regcache *regcache;
regcache = inferior_regcache_data (thread);
if (regcache == NULL)
return;
if (regcache->registers_valid)
{
struct thread_info *saved_thread = current_thread;
current_thread = thread;
store_inferior_registers (regcache, -1);
current_thread = saved_thread;
}
regcache->registers_valid = 0;
}
static int
regcache_invalidate_one (struct inferior_list_entry *entry,
void *pid_p)
{
struct thread_info *thread = (struct thread_info *) entry;
int pid = *(int *) pid_p;
/* Only invalidate the regcaches of threads of this process. */
if (ptid_get_pid (entry->id) == pid)
regcache_invalidate_thread (thread);
return 0;
}
/* See regcache.h. */
void
regcache_invalidate_pid (int pid)
{
find_inferior (&all_threads, regcache_invalidate_one, &pid);
}
/* See regcache.h. */
void
regcache_invalidate (void)
{
/* Only update the threads of the current process. */
int pid = ptid_get_pid (current_thread->entry.id);
regcache_invalidate_pid (pid);
}
#endif
struct regcache *
init_register_cache (struct regcache *regcache,
const struct target_desc *tdesc,
unsigned char *regbuf)
{
if (regbuf == NULL)
{
#ifndef IN_PROCESS_AGENT
/* 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->tdesc = tdesc;
regcache->registers
= (unsigned char *) xcalloc (1, tdesc->registers_size);
regcache->registers_owned = 1;
regcache->register_status
= (unsigned char *) xmalloc (tdesc->num_registers);
memset ((void *) regcache->register_status, REG_UNAVAILABLE,
tdesc->num_registers);
#else
gdb_assert_not_reached ("can't allocate memory from the heap");
#endif
}
else
{
regcache->tdesc = tdesc;
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 (const struct target_desc *tdesc)
{
struct regcache *regcache = XCNEW (struct regcache);
gdb_assert (tdesc->registers_size != 0);
return init_register_cache (regcache, tdesc, 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)
{
gdb_assert (src != NULL && dst != NULL);
gdb_assert (src->tdesc == dst->tdesc);
gdb_assert (src != dst);
memcpy (dst->registers, src->registers, src->tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
if (dst->register_status != NULL && src->register_status != NULL)
memcpy (dst->register_status, src->register_status,
src->tdesc->num_registers);
#endif
dst->registers_valid = src->registers_valid;
}
#ifndef IN_PROCESS_AGENT
void
registers_to_string (struct regcache *regcache, char *buf)
{
unsigned char *registers = regcache->registers;
const struct target_desc *tdesc = regcache->tdesc;
int i;
for (i = 0; i < tdesc->num_registers; i++)
{
if (regcache->register_status[i] == REG_VALID)
{
bin2hex (registers, buf, register_size (tdesc, i));
buf += register_size (tdesc, i) * 2;
}
else
{
memset (buf, 'x', register_size (tdesc, i) * 2);
buf += register_size (tdesc, i) * 2;
}
registers += register_size (tdesc, i);
}
*buf = '\0';
}
void
registers_from_string (struct regcache *regcache, char *buf)
{
int len = strlen (buf);
unsigned char *registers = regcache->registers;
const struct target_desc *tdesc = regcache->tdesc;
if (len != tdesc->registers_size * 2)
{
warning ("Wrong sized register packet (expected %d bytes, got %d)",
2 * tdesc->registers_size, len);
if (len > tdesc->registers_size * 2)
len = tdesc->registers_size * 2;
}
hex2bin (buf, registers, len / 2);
}
struct reg *
find_register_by_name (const struct target_desc *tdesc, const char *name)
{
int i;
for (i = 0; i < tdesc->num_registers; i++)
if (strcmp (name, tdesc->reg_defs[i].name) == 0)
return &tdesc->reg_defs[i];
internal_error (__FILE__, __LINE__, "Unknown register %s requested",
name);
}
int
find_regno (const struct target_desc *tdesc, const char *name)
{
int i;
for (i = 0; i < tdesc->num_registers; i++)
if (strcmp (name, tdesc->reg_defs[i].name) == 0)
return i;
internal_error (__FILE__, __LINE__, "Unknown register %s requested",
name);
}
struct reg *
find_register_by_number (const struct target_desc *tdesc, int n)
{
return &tdesc->reg_defs[n];
}
#endif
#ifndef IN_PROCESS_AGENT
static void
free_register_cache_thread (struct thread_info *thread)
{
struct regcache *regcache = inferior_regcache_data (thread);
if (regcache != NULL)
{
regcache_invalidate_thread (thread);
free_register_cache (regcache);
set_inferior_regcache_data (thread, NULL);
}
}
static void
free_register_cache_thread_one (struct inferior_list_entry *entry)
{
struct thread_info *thread = (struct thread_info *) entry;
free_register_cache_thread (thread);
}
void
regcache_release (void)
{
/* Flush and release all pre-existing register caches. */
for_each_inferior (&all_threads, free_register_cache_thread_one);
}
#endif
int
register_cache_size (const struct target_desc *tdesc)
{
return tdesc->registers_size;
}
int
register_size (const struct target_desc *tdesc, int n)
{
return tdesc->reg_defs[n].size / 8;
}
/* See common/common-regcache.h. */
int
regcache_register_size (const struct regcache *regcache, int n)
{
return register_size (regcache->tdesc, n);
}
static unsigned char *
register_data (struct regcache *regcache, int n, int fetch)
{
return regcache->registers + regcache->tdesc->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 (regcache->tdesc, 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 (regcache->tdesc, 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 (regcache->tdesc, 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)
{
const struct target_desc *tdesc = regcache->tdesc;
memcpy (regcache->registers, buf, tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
{
int i;
for (i = 0; i < tdesc->num_registers; i++)
regcache->register_status[i] = REG_VALID;
}
#endif
}
else
{
const struct target_desc *tdesc = regcache->tdesc;
memset (regcache->registers, 0, tdesc->registers_size);
#ifndef IN_PROCESS_AGENT
{
int i;
for (i = 0; i < tdesc->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 (regcache->tdesc, name), buf);
}
#endif
void
collect_register (struct regcache *regcache, int n, void *buf)
{
memcpy (buf, register_data (regcache, n, 1),
register_size (regcache->tdesc, n));
}
enum register_status
regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
ULONGEST *val)
{
int size;
gdb_assert (regcache != NULL);
gdb_assert (regnum >= 0 && regnum < regcache->tdesc->num_registers);
size = register_size (regcache->tdesc, regnum);
if (size > (int) sizeof (ULONGEST))
error (_("That operation is not available on integers of more than"
"%d bytes."),
(int) sizeof (ULONGEST));
collect_register (regcache, regnum, val);
return REG_VALID;
}
#ifndef IN_PROCESS_AGENT
void
collect_register_as_string (struct regcache *regcache, int n, char *buf)
{
bin2hex (register_data (regcache, n, 1), buf,
register_size (regcache->tdesc, n));
}
void
collect_register_by_name (struct regcache *regcache,
const char *name, void *buf)
{
collect_register (regcache, find_regno (regcache->tdesc, 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