dnlc.c revision 39f030b80b0794a689e3fad42f42c12612f88545
229N/A/*
229N/A * This file and its contents are supplied under the terms of the
229N/A * Common Development and Distribution License ("CDDL"), version 1.0.
229N/A * You may only use this file in accordance with the terms of version
229N/A * 1.0 of the CDDL.
229N/A *
229N/A * A full copy of the text of the CDDL should have accompanied this
229N/A * source. A copy of the CDDL is also available via the Internet at
229N/A * http://www.illumos.org/license/CDDL.
229N/A */
229N/A
229N/A/*
229N/A * Copyright 2016 Joyent, Inc.
229N/A */
229N/A
229N/A#include "dnlc.h"
229N/A
229N/A#include <mdb/mdb_modapi.h>
229N/A#include <sys/dnlc.h>
229N/A
3996N/Atypedef struct dnlc_walk {
229N/A int dw_hashsz;
229N/A int dw_index;
229N/A uintptr_t dw_hash;
1273N/A uintptr_t dw_head;
229N/A} dnlc_walk_t;
229N/A
618N/A
229N/Aint
1273N/Adnlc_walk_init(mdb_walk_state_t *wsp)
229N/A{
3661N/A dnlc_walk_t *dwp;
3661N/A
3996N/A if (wsp->walk_addr != NULL) {
3996N/A mdb_warn("dnlc walk doesn't support global walks\n");
229N/A return (WALK_ERR);
229N/A }
229N/A
229N/A dwp = mdb_zalloc(sizeof (dnlc_walk_t), UM_SLEEP);
229N/A if (mdb_readvar(&dwp->dw_hashsz, "nc_hashsz") == -1 ||
229N/A dwp->dw_hashsz <= 0) {
229N/A mdb_warn("failed to read 'nc_hashsz'\n");
229N/A mdb_free(dwp, sizeof (dnlc_walk_t));
229N/A return (WALK_ERR);
229N/A }
229N/A if (dwp->dw_hashsz <= 0) {
229N/A mdb_warn("invalid 'nc_hashsz' value\n");
229N/A mdb_free(dwp, sizeof (dnlc_walk_t));
718N/A return (WALK_ERR);
718N/A }
718N/A if (mdb_readvar(&dwp->dw_hash, "nc_hash") == -1) {
231N/A mdb_warn("failed to read 'nc_hash'\n");
231N/A mdb_free(dwp, sizeof (dnlc_walk_t));
231N/A return (WALK_ERR);
814N/A }
231N/A
229N/A wsp->walk_data = dwp;
229N/A return (WALK_NEXT);
229N/A}
229N/A
229N/Aint
229N/Adnlc_walk_step(mdb_walk_state_t *wsp)
229N/A{
229N/A dnlc_walk_t *dwp = wsp->walk_data;
229N/A nc_hash_t hash;
229N/A uintptr_t result, addr = wsp->walk_addr;
3996N/A
3996N/Anext:
3996N/A while (addr == dwp->dw_head || addr == NULL) {
if (dwp->dw_index >= dwp->dw_hashsz) {
return (WALK_DONE);
}
dwp->dw_head = dwp->dw_hash +
(sizeof (nc_hash_t) * dwp->dw_index);
if (mdb_vread(&hash, sizeof (hash), dwp->dw_head) == -1) {
mdb_warn("failed to read nc_hash_t at %#lx",
dwp->dw_hash);
return (WALK_ERR);
}
dwp->dw_index++;
addr = (uintptr_t)hash.hash_next;
}
result = addr;
if (mdb_vread(&addr, sizeof (uintptr_t), addr) == -1) {
/*
* This entry may have become bogus since acquiring the address
* from its neighbor. Continue on if that is the case.
*/
addr = NULL;
goto next;
}
wsp->walk_addr = addr;
return (wsp->walk_callback(result, &result, wsp->walk_cbdata));
}
void
dnlc_walk_fini(mdb_walk_state_t *wsp)
{
dnlc_walk_t *dwp = wsp->walk_data;
mdb_free(dwp, sizeof (dnlc_walk_t));
}