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dff7492c9b
gdbserver/ * regcache.c (find_register_by_number): Make static. (find_regno): Use find_register_by_number * regcache.h (struct reg): Remove declaration.
470 lines
11 KiB
C
470 lines
11 KiB
C
/* Register support routines for the remote server for GDB.
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Copyright (C) 2001-2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "regdef.h"
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#include "gdbthread.h"
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#include "tdesc.h"
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#include "rsp-low.h"
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#ifndef IN_PROCESS_AGENT
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struct regcache *
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get_thread_regcache (struct thread_info *thread, int fetch)
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{
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struct regcache *regcache;
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regcache = thread_regcache_data (thread);
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/* Threads' regcaches are created lazily, because biarch targets add
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the main thread/lwp before seeing it stop for the first time, and
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it is only after the target sees the thread stop for the first
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time that the target has a chance of determining the process's
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architecture. IOW, when we first add the process's main thread
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we don't know which architecture/tdesc its regcache should
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have. */
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if (regcache == NULL)
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{
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struct process_info *proc = get_thread_process (thread);
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gdb_assert (proc->tdesc != NULL);
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regcache = new_register_cache (proc->tdesc);
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set_thread_regcache_data (thread, regcache);
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}
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if (fetch && regcache->registers_valid == 0)
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{
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struct thread_info *saved_thread = current_thread;
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current_thread = thread;
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/* Invalidate all registers, to prevent stale left-overs. */
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memset (regcache->register_status, REG_UNAVAILABLE,
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regcache->tdesc->reg_defs.size ());
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fetch_inferior_registers (regcache, -1);
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current_thread = saved_thread;
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regcache->registers_valid = 1;
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}
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return regcache;
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}
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/* See common/common-regcache.h. */
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struct regcache *
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get_thread_regcache_for_ptid (ptid_t ptid)
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{
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return get_thread_regcache (find_thread_ptid (ptid), 1);
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}
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void
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regcache_invalidate_thread (struct thread_info *thread)
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{
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struct regcache *regcache;
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regcache = thread_regcache_data (thread);
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if (regcache == NULL)
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return;
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if (regcache->registers_valid)
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{
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struct thread_info *saved_thread = current_thread;
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current_thread = thread;
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store_inferior_registers (regcache, -1);
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current_thread = saved_thread;
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}
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regcache->registers_valid = 0;
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}
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/* See regcache.h. */
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void
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regcache_invalidate_pid (int pid)
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{
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/* Only invalidate the regcaches of threads of this process. */
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for_each_thread (pid, regcache_invalidate_thread);
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}
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/* See regcache.h. */
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void
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regcache_invalidate (void)
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{
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/* Only update the threads of the current process. */
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int pid = current_thread->id.pid ();
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regcache_invalidate_pid (pid);
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}
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#endif
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struct regcache *
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init_register_cache (struct regcache *regcache,
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const struct target_desc *tdesc,
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unsigned char *regbuf)
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{
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if (regbuf == NULL)
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{
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#ifndef IN_PROCESS_AGENT
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/* Make sure to zero-initialize the register cache when it is
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created, in case there are registers the target never
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fetches. This way they'll read as zero instead of
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garbage. */
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regcache->tdesc = tdesc;
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regcache->registers
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= (unsigned char *) xcalloc (1, tdesc->registers_size);
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regcache->registers_owned = 1;
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regcache->register_status
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= (unsigned char *) xmalloc (tdesc->reg_defs.size ());
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memset ((void *) regcache->register_status, REG_UNAVAILABLE,
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tdesc->reg_defs.size ());
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#else
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gdb_assert_not_reached ("can't allocate memory from the heap");
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#endif
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}
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else
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{
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regcache->tdesc = tdesc;
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regcache->registers = regbuf;
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regcache->registers_owned = 0;
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#ifndef IN_PROCESS_AGENT
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regcache->register_status = NULL;
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#endif
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}
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regcache->registers_valid = 0;
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return regcache;
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}
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#ifndef IN_PROCESS_AGENT
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struct regcache *
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new_register_cache (const struct target_desc *tdesc)
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{
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struct regcache *regcache = XCNEW (struct regcache);
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gdb_assert (tdesc->registers_size != 0);
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return init_register_cache (regcache, tdesc, NULL);
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}
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void
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free_register_cache (struct regcache *regcache)
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{
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if (regcache)
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{
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if (regcache->registers_owned)
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free (regcache->registers);
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free (regcache->register_status);
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free (regcache);
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}
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}
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#endif
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void
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regcache_cpy (struct regcache *dst, struct regcache *src)
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{
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gdb_assert (src != NULL && dst != NULL);
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gdb_assert (src->tdesc == dst->tdesc);
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gdb_assert (src != dst);
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memcpy (dst->registers, src->registers, src->tdesc->registers_size);
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#ifndef IN_PROCESS_AGENT
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if (dst->register_status != NULL && src->register_status != NULL)
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memcpy (dst->register_status, src->register_status,
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src->tdesc->reg_defs.size ());
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#endif
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dst->registers_valid = src->registers_valid;
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}
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/* Return a pointer to the description of register N. */
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static const struct reg *
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find_register_by_number (const struct target_desc *tdesc, int n)
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{
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return tdesc->reg_defs[n];
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}
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#ifndef IN_PROCESS_AGENT
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void
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registers_to_string (struct regcache *regcache, char *buf)
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{
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unsigned char *registers = regcache->registers;
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const struct target_desc *tdesc = regcache->tdesc;
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for (int i = 0; i < tdesc->reg_defs.size (); ++i)
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{
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if (regcache->register_status[i] == REG_VALID)
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{
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bin2hex (registers, buf, register_size (tdesc, i));
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buf += register_size (tdesc, i) * 2;
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}
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else
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{
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memset (buf, 'x', register_size (tdesc, i) * 2);
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buf += register_size (tdesc, i) * 2;
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}
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registers += register_size (tdesc, i);
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}
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*buf = '\0';
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}
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void
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registers_from_string (struct regcache *regcache, char *buf)
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{
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int len = strlen (buf);
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unsigned char *registers = regcache->registers;
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const struct target_desc *tdesc = regcache->tdesc;
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if (len != tdesc->registers_size * 2)
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{
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warning ("Wrong sized register packet (expected %d bytes, got %d)",
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2 * tdesc->registers_size, len);
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if (len > tdesc->registers_size * 2)
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len = tdesc->registers_size * 2;
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}
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hex2bin (buf, registers, len / 2);
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}
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int
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find_regno (const struct target_desc *tdesc, const char *name)
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{
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for (int i = 0; i < tdesc->reg_defs.size (); ++i)
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{
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if (strcmp (name, find_register_by_number (tdesc, i)->name) == 0)
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return i;
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}
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internal_error (__FILE__, __LINE__, "Unknown register %s requested",
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name);
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}
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static void
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free_register_cache_thread (struct thread_info *thread)
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{
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struct regcache *regcache = thread_regcache_data (thread);
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if (regcache != NULL)
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{
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regcache_invalidate_thread (thread);
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free_register_cache (regcache);
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set_thread_regcache_data (thread, NULL);
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}
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}
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void
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regcache_release (void)
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{
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/* Flush and release all pre-existing register caches. */
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for_each_thread (free_register_cache_thread);
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}
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#endif
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int
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register_cache_size (const struct target_desc *tdesc)
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{
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return tdesc->registers_size;
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}
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int
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register_size (const struct target_desc *tdesc, int n)
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{
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return find_register_by_number (tdesc, n)->size / 8;
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}
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/* See common/common-regcache.h. */
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int
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regcache_register_size (const struct regcache *regcache, int n)
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{
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return register_size (regcache->tdesc, n);
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}
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static unsigned char *
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register_data (struct regcache *regcache, int n, int fetch)
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{
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return (regcache->registers
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+ find_register_by_number (regcache->tdesc, n)->offset / 8);
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}
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/* Supply register N, whose contents are stored in BUF, to REGCACHE.
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If BUF is NULL, the register's value is recorded as
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unavailable. */
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void
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supply_register (struct regcache *regcache, int n, const void *buf)
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{
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if (buf)
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{
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memcpy (register_data (regcache, n, 0), buf,
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register_size (regcache->tdesc, n));
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#ifndef IN_PROCESS_AGENT
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if (regcache->register_status != NULL)
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regcache->register_status[n] = REG_VALID;
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#endif
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}
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else
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{
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memset (register_data (regcache, n, 0), 0,
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register_size (regcache->tdesc, n));
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#ifndef IN_PROCESS_AGENT
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if (regcache->register_status != NULL)
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regcache->register_status[n] = REG_UNAVAILABLE;
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#endif
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}
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}
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/* Supply register N with value zero to REGCACHE. */
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void
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supply_register_zeroed (struct regcache *regcache, int n)
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{
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memset (register_data (regcache, n, 0), 0,
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register_size (regcache->tdesc, n));
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#ifndef IN_PROCESS_AGENT
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if (regcache->register_status != NULL)
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regcache->register_status[n] = REG_VALID;
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#endif
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}
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/* Supply the whole register set whose contents are stored in BUF, to
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REGCACHE. If BUF is NULL, all the registers' values are recorded
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as unavailable. */
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void
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supply_regblock (struct regcache *regcache, const void *buf)
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{
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if (buf)
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{
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const struct target_desc *tdesc = regcache->tdesc;
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memcpy (regcache->registers, buf, tdesc->registers_size);
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#ifndef IN_PROCESS_AGENT
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{
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int i;
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for (i = 0; i < tdesc->reg_defs.size (); i++)
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regcache->register_status[i] = REG_VALID;
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}
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#endif
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}
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else
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{
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const struct target_desc *tdesc = regcache->tdesc;
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memset (regcache->registers, 0, tdesc->registers_size);
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#ifndef IN_PROCESS_AGENT
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{
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int i;
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for (i = 0; i < tdesc->reg_defs.size (); i++)
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regcache->register_status[i] = REG_UNAVAILABLE;
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}
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#endif
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}
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}
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#ifndef IN_PROCESS_AGENT
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void
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supply_register_by_name (struct regcache *regcache,
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const char *name, const void *buf)
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{
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supply_register (regcache, find_regno (regcache->tdesc, name), buf);
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}
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#endif
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void
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collect_register (struct regcache *regcache, int n, void *buf)
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{
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memcpy (buf, register_data (regcache, n, 1),
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register_size (regcache->tdesc, n));
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}
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enum register_status
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regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
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ULONGEST *val)
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{
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int size;
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gdb_assert (regcache != NULL);
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gdb_assert (regnum >= 0
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&& regnum < regcache->tdesc->reg_defs.size ());
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size = register_size (regcache->tdesc, regnum);
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if (size > (int) sizeof (ULONGEST))
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error (_("That operation is not available on integers of more than"
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"%d bytes."),
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(int) sizeof (ULONGEST));
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*val = 0;
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collect_register (regcache, regnum, val);
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return REG_VALID;
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}
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#ifndef IN_PROCESS_AGENT
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void
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collect_register_as_string (struct regcache *regcache, int n, char *buf)
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{
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bin2hex (register_data (regcache, n, 1), buf,
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register_size (regcache->tdesc, n));
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}
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void
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collect_register_by_name (struct regcache *regcache,
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const char *name, void *buf)
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{
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collect_register (regcache, find_regno (regcache->tdesc, name), buf);
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}
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/* Special handling for register PC. */
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CORE_ADDR
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regcache_read_pc (struct regcache *regcache)
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{
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CORE_ADDR pc_val;
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if (the_target->read_pc)
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pc_val = the_target->read_pc (regcache);
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else
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internal_error (__FILE__, __LINE__,
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"regcache_read_pc: Unable to find PC");
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return pc_val;
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}
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void
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regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
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{
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if (the_target->write_pc)
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the_target->write_pc (regcache, pc);
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else
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internal_error (__FILE__, __LINE__,
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"regcache_write_pc: Unable to update PC");
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}
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#endif
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