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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright 2013 Nexenta Systems, Inc. All rights reserved.
*/
#include <mdb/mdb_modapi.h>
#include <sys/list.h>
typedef struct list_walk_data {
uintptr_t lw_head; /* address of list head */
size_t lw_size; /* size of list element */
size_t lw_offset; /* list element linkage offset */
void *lw_obj; /* buffer of lw_size to hold list element */
uintptr_t lw_end; /* last node in specified range */
const char *lw_elem_name;
int (*lw_elem_check)(void *, uintptr_t, void *);
void *lw_elem_check_arg;
} list_walk_data_t;
/*
* Initialize a forward walk through a list.
*
* begin and end optionally specify objects other than the first and last
* objects in the list; either or both may be NULL (defaulting to first and
* last).
*
* list_name and element_name specify command-specific labels other than
* "list_t" and "list element" for use in error messages.
*
* element_check() returns -1, 1, or 0: abort the walk with an error, stop
* without an error, or allow the normal callback; arg is an optional user
* argument to element_check().
*/
int
list_walk_init_range(mdb_walk_state_t *wsp, uintptr_t begin, uintptr_t end,
const char *list_name, const char *element_name,
int (*element_check)(void *, uintptr_t, void *), void *arg)
{
list_walk_data_t *lwd;
list_t list;
if (list_name == NULL)
list_name = "list_t";
if (element_name == NULL)
element_name = "list element";
if (mdb_vread(&list, sizeof (list_t), wsp->walk_addr) == -1) {
mdb_warn("failed to read %s at %#lx", list_name,
wsp->walk_addr);
return (WALK_ERR);
}
if (list.list_size < list.list_offset + sizeof (list_node_t)) {
mdb_warn("invalid or uninitialized %s at %#lx\n", list_name,
wsp->walk_addr);
return (WALK_ERR);
}
lwd = mdb_alloc(sizeof (list_walk_data_t), UM_SLEEP);
lwd->lw_size = list.list_size;
lwd->lw_offset = list.list_offset;
lwd->lw_obj = mdb_alloc(list.list_size, UM_SLEEP);
lwd->lw_head = (uintptr_t)&((list_t *)wsp->walk_addr)->list_head;
lwd->lw_end = (end == 0 ? 0 : end + lwd->lw_offset);
lwd->lw_elem_name = element_name;
lwd->lw_elem_check = element_check;
lwd->lw_elem_check_arg = arg;
wsp->walk_addr = (begin == 0
? (uintptr_t)list.list_head.list_next
: begin + lwd->lw_offset);
wsp->walk_data = lwd;
return (WALK_NEXT);
}
int
list_walk_init(mdb_walk_state_t *wsp)
{
return (list_walk_init_range(wsp, 0, 0, NULL, NULL, NULL, NULL));
}
int
list_walk_init_named(mdb_walk_state_t *wsp,
const char *list_name, const char *element_name)
{
return (list_walk_init_range(wsp, 0, 0, list_name, element_name,
NULL, NULL));
}
int
list_walk_init_checked(mdb_walk_state_t *wsp,
const char *list_name, const char *element_name,
int (*element_check)(void *, uintptr_t, void *), void *arg)
{
return (list_walk_init_range(wsp, 0, 0, list_name, element_name,
element_check, arg));
}
int
list_walk_step(mdb_walk_state_t *wsp)
{
list_walk_data_t *lwd = wsp->walk_data;
uintptr_t addr = wsp->walk_addr - lwd->lw_offset;
list_node_t *node;
int status;
if (wsp->walk_addr == lwd->lw_head)
return (WALK_DONE);
if (lwd->lw_end != 0 && wsp->walk_addr == lwd->lw_end)
return (WALK_DONE);
if (mdb_vread(lwd->lw_obj, lwd->lw_size, addr) == -1) {
mdb_warn("failed to read %s at %#lx", lwd->lw_elem_name, addr);
return (WALK_ERR);
}
if (lwd->lw_elem_check != NULL) {
int rc = lwd->lw_elem_check(lwd->lw_obj, addr,
lwd->lw_elem_check_arg);
if (rc == -1)
return (WALK_ERR);
else if (rc == 1)
return (WALK_DONE);
}
status = wsp->walk_callback(addr, lwd->lw_obj, wsp->walk_cbdata);
node = (list_node_t *)((uintptr_t)lwd->lw_obj + lwd->lw_offset);
wsp->walk_addr = (uintptr_t)node->list_next;
return (status);
}
void
list_walk_fini(mdb_walk_state_t *wsp)
{
list_walk_data_t *lwd = wsp->walk_data;
mdb_free(lwd->lw_obj, lwd->lw_size);
mdb_free(lwd, sizeof (list_walk_data_t));
}
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