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178 lines
5.0 KiB
C
178 lines
5.0 KiB
C
/* Target description support for GDB.
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Copyright (C) 2006, 2007 Free Software Foundation, Inc.
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Contributed by CodeSourcery.
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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 2 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, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "arch-utils.h"
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#include "target.h"
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#include "target-descriptions.h"
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#include "vec.h"
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#include "gdb_assert.h"
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/* Types. */
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typedef struct property
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{
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const char *key;
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const char *value;
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} property_s;
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DEF_VEC_O(property_s);
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struct target_desc
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{
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/* Any architecture-specific properties specified by the target. */
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VEC(property_s) *properties;
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};
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/* Global state. These variables are associated with the current
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target; if GDB adds support for multiple simultaneous targets, then
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these variables should become target-specific data. */
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/* A flag indicating that a description has already been fetched from
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the current target, so it should not be queried again. */
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static int target_desc_fetched;
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/* The description fetched from the current target, or NULL if the
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current target did not supply any description. Only valid when
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target_desc_fetched is set. Only the description initialization
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code should access this; normally, the description should be
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accessed through the gdbarch object. */
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static const struct target_desc *current_target_desc;
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/* Fetch the current target's description, and switch the current
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architecture to one which incorporates that description. */
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void
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target_find_description (void)
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{
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/* If we've already fetched a description from the target, don't do
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it again. This allows a target to fetch the description early,
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during its to_open or to_create_inferior, if it needs extra
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information about the target to initialize. */
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if (target_desc_fetched)
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return;
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/* The current architecture should not have any target description
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specified. It should have been cleared, e.g. when we
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disconnected from the previous target. */
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gdb_assert (gdbarch_target_desc (current_gdbarch) == NULL);
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current_target_desc = target_read_description (¤t_target);
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/* If a non-NULL description was returned, then update the current
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architecture. */
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if (current_target_desc)
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{
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struct gdbarch_info info;
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gdbarch_info_init (&info);
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info.target_desc = current_target_desc;
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if (!gdbarch_update_p (info))
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warning (_("Could not use target-supplied description"));
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}
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/* Now that we know this description is usable, record that we
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fetched it. */
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target_desc_fetched = 1;
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}
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/* Discard any description fetched from the current target, and switch
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the current architecture to one with no target description. */
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void
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target_clear_description (void)
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{
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struct gdbarch_info info;
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if (!target_desc_fetched)
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return;
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target_desc_fetched = 0;
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current_target_desc = NULL;
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gdbarch_info_init (&info);
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if (!gdbarch_update_p (info))
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internal_error (__FILE__, __LINE__,
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_("Could not remove target-supplied description"));
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}
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/* Return the global current target description. This should only be
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used by gdbarch initialization code; most access should be through
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an existing gdbarch. */
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const struct target_desc *
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target_current_description (void)
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{
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if (target_desc_fetched)
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return current_target_desc;
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return NULL;
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}
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/* Return the string value of a property named KEY, or NULL if the
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property was not specified. */
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const char *
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tdesc_property (const struct target_desc *target_desc, const char *key)
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{
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struct property *prop;
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int ix;
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for (ix = 0; VEC_iterate (property_s, target_desc->properties, ix, prop);
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ix++)
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if (strcmp (prop->key, key) == 0)
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return prop->value;
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return NULL;
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}
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/* Methods for constructing a target description. */
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struct target_desc *
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allocate_target_description (void)
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{
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return XZALLOC (struct target_desc);
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}
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void
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set_tdesc_property (struct target_desc *target_desc,
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const char *key, const char *value)
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{
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struct property *prop, new_prop;
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int ix;
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gdb_assert (key != NULL && value != NULL);
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for (ix = 0; VEC_iterate (property_s, target_desc->properties, ix, prop);
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ix++)
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if (strcmp (prop->key, key) == 0)
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internal_error (__FILE__, __LINE__,
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_("Attempted to add duplicate property \"%s\""), key);
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new_prop.key = key;
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new_prop.value = value;
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VEC_safe_push (property_s, target_desc->properties, &new_prop);
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}
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