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https://sourceware.org/git/binutils-gdb.git
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28e7fd6234
Two modifications: 1. The addition of 2013 to the copyright year range for every file; 2. The use of a single year range, instead of potentially multiple year ranges, as approved by the FSF.
431 lines
9.5 KiB
C
431 lines
9.5 KiB
C
/* Register support routines for the remote server for GDB.
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Copyright (C) 2001-2013 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 <stdlib.h>
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#include <string.h>
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static int register_bytes;
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static struct reg *reg_defs;
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static int num_registers;
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const char **gdbserver_expedite_regs;
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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 = (struct regcache *) inferior_regcache_data (thread);
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if (regcache == NULL)
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fatal ("no register cache");
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if (fetch && regcache->registers_valid == 0)
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{
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struct thread_info *saved_inferior = current_inferior;
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current_inferior = thread;
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fetch_inferior_registers (regcache, -1);
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current_inferior = saved_inferior;
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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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void
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regcache_invalidate_one (struct inferior_list_entry *entry)
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{
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struct thread_info *thread = (struct thread_info *) entry;
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struct regcache *regcache;
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regcache = (struct regcache *) inferior_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_inferior = current_inferior;
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current_inferior = thread;
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store_inferior_registers (regcache, -1);
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current_inferior = saved_inferior;
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}
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regcache->registers_valid = 0;
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}
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void
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regcache_invalidate (void)
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{
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for_each_inferior (&all_threads, regcache_invalidate_one);
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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, unsigned char *regbuf)
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{
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#ifndef IN_PROCESS_AGENT
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if (regbuf == NULL)
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{
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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->registers = xcalloc (1, register_bytes);
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regcache->registers_owned = 1;
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regcache->register_status = xcalloc (1, num_registers);
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gdb_assert (REG_UNAVAILABLE == 0);
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}
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else
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#else
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if (regbuf == NULL)
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fatal ("init_register_cache: can't allocate memory from the heap");
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else
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#endif
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{
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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 (void)
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{
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struct regcache *regcache;
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if (register_bytes == 0)
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return NULL; /* The architecture hasn't been initialized yet. */
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regcache = xmalloc (sizeof (*regcache));
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return init_register_cache (regcache, 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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memcpy (dst->registers, src->registers, register_bytes);
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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, num_registers);
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#endif
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dst->registers_valid = src->registers_valid;
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}
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#ifndef IN_PROCESS_AGENT
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static void
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realloc_register_cache (struct inferior_list_entry *thread_p)
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{
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struct thread_info *thread = (struct thread_info *) thread_p;
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struct regcache *regcache
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= (struct regcache *) inferior_regcache_data (thread);
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if (regcache != NULL)
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regcache_invalidate_one (thread_p);
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free_register_cache (regcache);
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set_inferior_regcache_data (thread, new_register_cache ());
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}
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#endif
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void
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set_register_cache (struct reg *regs, int n)
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{
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int offset, i;
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#ifndef IN_PROCESS_AGENT
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/* Before changing the register cache internal layout, flush the
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contents of valid caches back to the threads. */
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regcache_invalidate ();
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#endif
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reg_defs = regs;
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num_registers = n;
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offset = 0;
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for (i = 0; i < n; i++)
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{
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regs[i].offset = offset;
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offset += regs[i].size;
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}
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register_bytes = offset / 8;
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/* Make sure PBUFSIZ is large enough to hold a full register packet. */
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if (2 * register_bytes + 32 > PBUFSIZ)
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fatal ("Register packet size exceeds PBUFSIZ.");
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#ifndef IN_PROCESS_AGENT
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/* Re-allocate all pre-existing register caches. */
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for_each_inferior (&all_threads, realloc_register_cache);
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#endif
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}
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int
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register_cache_size (void)
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{
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return register_bytes;
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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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int i;
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for (i = 0; i < num_registers; i++)
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{
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if (regcache->register_status[i] == REG_VALID)
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{
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convert_int_to_ascii (registers, buf, register_size (i));
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buf += register_size (i) * 2;
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}
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else
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{
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memset (buf, 'x', register_size (i) * 2);
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buf += register_size (i) * 2;
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}
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registers += register_size (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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if (len != register_bytes * 2)
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{
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warning ("Wrong sized register packet (expected %d bytes, got %d)",
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2*register_bytes, len);
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if (len > register_bytes * 2)
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len = register_bytes * 2;
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}
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convert_ascii_to_int (buf, registers, len / 2);
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}
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struct reg *
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find_register_by_name (const char *name)
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{
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int i;
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for (i = 0; i < num_registers; i++)
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if (!strcmp (name, reg_defs[i].name))
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return ®_defs[i];
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fatal ("Unknown register %s requested", name);
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return 0;
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}
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int
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find_regno (const char *name)
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{
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int i;
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for (i = 0; i < num_registers; i++)
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if (!strcmp (name, reg_defs[i].name))
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return i;
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fatal ("Unknown register %s requested", name);
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return -1;
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}
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struct reg *
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find_register_by_number (int n)
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{
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return ®_defs[n];
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}
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#endif
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int
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register_size (int n)
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{
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return reg_defs[n].size / 8;
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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 + (reg_defs[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, register_size (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, register_size (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, register_size (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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memcpy (regcache->registers, buf, register_bytes);
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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 < num_registers; 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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memset (regcache->registers, 0, register_bytes);
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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 < num_registers; 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 (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), register_size (n));
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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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convert_int_to_ascii (register_data (regcache, n, 1),
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buf, register_size (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 (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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