6b1141e3f3
gdb: 2013-11-20 Yao Qi <yao@codesourcery.com> * target-dcache.c (target_dcache_get_or_init): Call set_address_space_data if 'dcache' is NULL.
148 lines
4 KiB
C
148 lines
4 KiB
C
/* Copyright (C) 1992-2013 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 "defs.h"
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#include "target-dcache.h"
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#include "gdbcmd.h"
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#include "progspace.h"
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/* The target dcache is kept per-address-space. This key lets us
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associate the cache with the address space. */
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static const struct address_space_data *target_dcache_aspace_key;
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/* Clean up dcache, represented by ARG, which is associated with
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ASPACE. */
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static void
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target_dcache_cleanup (struct address_space *aspace, void *arg)
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{
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dcache_free (arg);
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}
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/* Target dcache is initialized or not. */
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int
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target_dcache_init_p (void)
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{
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DCACHE *dcache = address_space_data (current_program_space->aspace,
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target_dcache_aspace_key);
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return (dcache != NULL);
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}
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/* Invalidate the target dcache. */
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void
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target_dcache_invalidate (void)
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{
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DCACHE *dcache = address_space_data (current_program_space->aspace,
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target_dcache_aspace_key);
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if (dcache != NULL)
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dcache_invalidate (dcache);
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}
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/* Return the target dcache. Return NULL if target dcache is not
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initialized yet. */
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DCACHE *
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target_dcache_get (void)
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{
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DCACHE *dcache = address_space_data (current_program_space->aspace,
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target_dcache_aspace_key);
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return dcache;
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}
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/* Return the target dcache. If it is not initialized yet, initialize
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it. */
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DCACHE *
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target_dcache_get_or_init (void)
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{
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DCACHE *dcache = address_space_data (current_program_space->aspace,
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target_dcache_aspace_key);
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if (dcache == NULL)
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{
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dcache = dcache_init ();
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set_address_space_data (current_program_space->aspace,
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target_dcache_aspace_key, dcache);
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}
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return dcache;
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}
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/* The option sets this. */
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static int stack_cache_enabled_p_1 = 1;
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/* And set_stack_cache_enabled_p updates this.
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The reason for the separation is so that we don't flush the cache for
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on->on transitions. */
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static int stack_cache_enabled_p = 1;
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/* This is called *after* the stack-cache has been set.
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Flush the cache for off->on and on->off transitions.
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There's no real need to flush the cache for on->off transitions,
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except cleanliness. */
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static void
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set_stack_cache_enabled_p (char *args, int from_tty,
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struct cmd_list_element *c)
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{
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if (stack_cache_enabled_p != stack_cache_enabled_p_1)
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target_dcache_invalidate ();
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stack_cache_enabled_p = stack_cache_enabled_p_1;
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}
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static void
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show_stack_cache_enabled_p (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
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}
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/* Return true if "stack cache" is enabled, otherwise, return false. */
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int
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stack_cache_enabled (void)
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{
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return stack_cache_enabled_p;
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}
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/* -Wmissing-prototypes */
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extern initialize_file_ftype _initialize_target_dcache;
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void
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_initialize_target_dcache (void)
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{
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add_setshow_boolean_cmd ("stack-cache", class_support,
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&stack_cache_enabled_p_1, _("\
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Set cache use for stack access."), _("\
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Show cache use for stack access."), _("\
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When on, use the data cache for all stack access, regardless of any\n\
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configured memory regions. This improves remote performance significantly.\n\
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By default, caching for stack access is on."),
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set_stack_cache_enabled_p,
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show_stack_cache_enabled_p,
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&setlist, &showlist);
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target_dcache_aspace_key
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= register_address_space_data_with_cleanup (NULL,
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target_dcache_cleanup);
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}
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