| /* |
| * CDDL HEADER START |
| * |
| * The contents of this file are subject to the terms of the |
| * Common Development and Distribution License, Version 1.0 only |
| * (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 2004 Sun Microsystems, Inc. All rights reserved. |
| * Use is subject to license terms. |
| */ |
| |
| #pragma ident "%Z%%M% %I% %E% SMI" |
| |
| /* |
| * Active walks are tracked using a WCB (Walk Control Block), which is a simple |
| * data structure that contains the mdb_walk_state_t passed to the various |
| * walker functions for this particular walk, as well as links to other walk |
| * layers if this is a layered walk. The control block is kept in a list |
| * associated with the MDB frame, so that we can clean up all the walks and |
| * call their respective fini routines at the end of command processing. |
| */ |
| |
| #include <mdb/mdb_module.h> |
| #include <mdb/mdb_modapi.h> |
| #include <mdb/mdb_debug.h> |
| #include <mdb/mdb_frame.h> |
| #include <mdb/mdb_err.h> |
| #include <mdb/mdb_wcb.h> |
| #include <mdb/mdb.h> |
| |
| mdb_wcb_t * |
| mdb_wcb_from_state(mdb_walk_state_t *wsp) |
| { |
| /* |
| * The walk state passed to a walker sits at the start of the |
| * walk control block, so we can ask the walker to pass this |
| * back to us and quickly obtain the control block: |
| */ |
| mdb_wcb_t *wcb = (mdb_wcb_t *)wsp; |
| |
| if (wcb->w_buftag != WCB_TAG_ACTIVE && wcb->w_buftag != WCB_TAG_INITIAL) |
| fail("walk state %p is corrupt or not active\n", (void *)wcb); |
| |
| return (wcb); |
| } |
| |
| mdb_wcb_t * |
| mdb_wcb_create(mdb_iwalker_t *iwp, mdb_walk_cb_t cb, void *data, uintptr_t addr) |
| { |
| mdb_wcb_t *wcb = mdb_zalloc(sizeof (mdb_wcb_t), UM_SLEEP); |
| |
| wcb->w_buftag = WCB_TAG_INITIAL; |
| wcb->w_walker = iwp; |
| |
| wcb->w_state.walk_callback = cb; |
| wcb->w_state.walk_cbdata = data; |
| wcb->w_state.walk_addr = addr; |
| wcb->w_state.walk_arg = iwp->iwlk_init_arg; |
| |
| return (wcb); |
| } |
| |
| void |
| mdb_wcb_destroy(mdb_wcb_t *wcb) |
| { |
| mdb_wcb_t *p, *q; |
| |
| for (p = wcb->w_lyr_head; p != NULL; p = q) { |
| q = wcb->w_lyr_link; |
| mdb_wcb_destroy(p); |
| } |
| |
| if (wcb->w_inited) |
| wcb->w_walker->iwlk_fini(&wcb->w_state); |
| |
| mdb_free(wcb, sizeof (mdb_wcb_t)); |
| } |
| |
| void |
| mdb_wcb_insert(mdb_wcb_t *wcb, mdb_frame_t *fp) |
| { |
| mdb_dprintf(MDB_DBG_WALK, "activate walk %s`%s wcb %p\n", |
| wcb->w_walker->iwlk_modp->mod_name, |
| wcb->w_walker->iwlk_name, (void *)wcb); |
| |
| wcb->w_buftag = WCB_TAG_ACTIVE; |
| wcb->w_link = fp->f_wcbs; |
| fp->f_wcbs = wcb; |
| } |
| |
| void |
| mdb_wcb_delete(mdb_wcb_t *wcb, mdb_frame_t *fp) |
| { |
| mdb_wcb_t **pp = &fp->f_wcbs; |
| mdb_wcb_t *w; |
| |
| mdb_dprintf(MDB_DBG_WALK, "deactivate walk %s`%s wcb %p\n", |
| wcb->w_walker->iwlk_modp->mod_name, |
| wcb->w_walker->iwlk_name, (void *)wcb); |
| |
| for (w = fp->f_wcbs; w != NULL; pp = &w->w_link, w = w->w_link) { |
| if (w == wcb) { |
| w->w_buftag = WCB_TAG_PASSIVE; |
| *pp = w->w_link; |
| return; |
| } |
| } |
| |
| fail("attempted to remove wcb not on list: %p\n", (void *)wcb); |
| } |
| |
| void |
| mdb_wcb_purge(mdb_wcb_t **wcbpp) |
| { |
| mdb_wcb_t *n, *wcb = *wcbpp; |
| |
| while (wcb != NULL) { |
| mdb_dprintf(MDB_DBG_WALK, "purge walk %s`%s wcb %p\n", |
| wcb->w_walker->iwlk_modp->mod_name, |
| wcb->w_walker->iwlk_name, (void *)wcb); |
| |
| n = wcb->w_link; |
| mdb_wcb_destroy(wcb); |
| wcb = n; |
| } |
| |
| *wcbpp = NULL; |
| } |