/* Register support routines for the remote server for GDB.
- Copyright 2001, 2002
- Free Software Foundation, Inc.
+ Copyright (C) 2001-2018 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 "server.h"
#include "regdef.h"
+#include "gdbthread.h"
+#include "tdesc.h"
+#include "rsp-low.h"
+#ifndef IN_PROCESS_AGENT
-#include <stdlib.h>
-#include <string.h>
+struct regcache *
+get_thread_regcache (struct thread_info *thread, int fetch)
+{
+ struct regcache *regcache;
-static char *registers;
-static int register_bytes;
+ regcache = thread_regcache_data (thread);
-static struct reg *reg_defs;
-static int num_registers;
+ /* 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);
-const char **gdbserver_expedite_regs;
+ gdb_assert (proc->tdesc != NULL);
-int
-registers_length (void)
+ regcache = new_register_cache (proc->tdesc);
+ set_thread_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->reg_defs.size ());
+ 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 2 * register_bytes;
+ return get_thread_regcache (find_thread_ptid (ptid), 1);
}
void
-set_register_cache (struct reg *regs, int n)
+regcache_invalidate_thread (struct thread_info *thread)
{
- int offset, i;
-
- reg_defs = regs;
- num_registers = n;
+ struct regcache *regcache;
+
+ regcache = thread_regcache_data (thread);
- offset = 0;
- for (i = 0; i < n; i++)
+ if (regcache == NULL)
+ return;
+
+ if (regcache->registers_valid)
{
- regs[i].offset = offset;
- offset += regs[i].size;
+ struct thread_info *saved_thread = current_thread;
+
+ current_thread = thread;
+ store_inferior_registers (regcache, -1);
+ current_thread = saved_thread;
}
- register_bytes = offset / 8;
- registers = malloc (offset / 8);
- if (!registers)
- fatal ("Could not allocate register cache.");
+ regcache->registers_valid = 0;
}
+/* See regcache.h. */
+
void
-registers_to_string (char *buf)
+regcache_invalidate_pid (int pid)
{
- convert_int_to_ascii (registers, buf, register_bytes);
+ /* Only invalidate the regcaches of threads of this process. */
+ for_each_thread (pid, regcache_invalidate_thread);
}
+/* See regcache.h. */
+
void
-registers_from_string (char *buf)
+regcache_invalidate (void)
{
- int len = strlen (buf);
+ /* Only update the threads of the current process. */
+ int pid = current_thread->id.pid ();
+
+ 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->reg_defs.size ());
+ memset ((void *) regcache->register_status, REG_UNAVAILABLE,
+ tdesc->reg_defs.size ());
+#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->reg_defs.size ());
+#endif
+ dst->registers_valid = src->registers_valid;
+}
+
+/* Return a reference to the description of register N. */
+
+static const struct reg &
+find_register_by_number (const struct target_desc *tdesc, int n)
+{
+ return tdesc->reg_defs[n];
+}
+
+#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;
- if (len != register_bytes * 2)
+ for (int i = 0; i < tdesc->reg_defs.size (); ++i)
{
- warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len);
- if (len > register_bytes * 2)
- len = register_bytes * 2;
+ 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);
}
- convert_ascii_to_int (buf, registers, len / 2);
+ *buf = '\0';
}
-struct reg *
-find_register_by_name (const char *name)
+void
+registers_from_string (struct regcache *regcache, char *buf)
{
- int i;
+ int len = strlen (buf);
+ unsigned char *registers = regcache->registers;
+ const struct target_desc *tdesc = regcache->tdesc;
- for (i = 0; i < num_registers; i++)
- if (!strcmp (name, reg_defs[i].name))
- return ®_defs[i];
- fatal ("Unknown register %s requested", name);
- return 0;
+ 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);
}
int
-find_regno (const char *name)
+find_regno (const struct target_desc *tdesc, const char *name)
+{
+ for (int i = 0; i < tdesc->reg_defs.size (); ++i)
+ {
+ if (strcmp (name, find_register_by_number (tdesc, i).name) == 0)
+ return i;
+ }
+ internal_error (__FILE__, __LINE__, "Unknown register %s requested",
+ name);
+}
+
+static void
+free_register_cache_thread (struct thread_info *thread)
{
- int i;
+ struct regcache *regcache = thread_regcache_data (thread);
- for (i = 0; i < num_registers; i++)
- if (!strcmp (name, reg_defs[i].name))
- return i;
- fatal ("Unknown register %s requested", name);
- return -1;
+ if (regcache != NULL)
+ {
+ regcache_invalidate_thread (thread);
+ free_register_cache (regcache);
+ set_thread_regcache_data (thread, NULL);
+ }
+}
+
+void
+regcache_release (void)
+{
+ /* Flush and release all pre-existing register caches. */
+ for_each_thread (free_register_cache_thread);
+}
+#endif
+
+int
+register_cache_size (const struct target_desc *tdesc)
+{
+ return tdesc->registers_size;
}
-struct reg *
-find_register_by_number (int n)
+int
+register_size (const struct target_desc *tdesc, int n)
{
- return ®_defs[n];
+ return find_register_by_number (tdesc, n).size / 8;
}
+/* See common/common-regcache.h. */
+
int
-register_size (int n)
+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
+ + find_register_by_number (regcache->tdesc, 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
+}
+
+#ifndef IN_PROCESS_AGENT
+
+/* Supply register called NAME with value zero to REGCACHE. */
+
+void
+supply_register_by_name_zeroed (struct regcache *regcache,
+ const char *name)
+{
+ supply_register_zeroed (regcache, find_regno (regcache->tdesc, name));
+}
+
+#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->reg_defs.size (); 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->reg_defs.size (); 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)
{
- return reg_defs[n].size / 8;
+ supply_register (regcache, find_regno (regcache->tdesc, name), buf);
}
-char *
-register_data (int n)
+#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->reg_defs.size ());
+
+ 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));
+
+ *val = 0;
+ 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)
{
- return registers + (reg_defs[n].offset / 8);
+ if (the_target->write_pc)
+ the_target->write_pc (regcache, pc);
+ else
+ internal_error (__FILE__, __LINE__,
+ "regcache_write_pc: Unable to update PC");
}
+#endif
projects / deliverable / binutils-gdb.git / blobdiff