1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2016 Joyent, Inc.
*/
#include "dnlc.h"
#include <mdb/mdb_modapi.h>
#include <sys/dnlc.h>
typedef struct dnlc_walk {
int dw_hashsz;
int dw_index;
uintptr_t dw_hash;
uintptr_t dw_head;
} dnlc_walk_t;
int
dnlc_walk_init(mdb_walk_state_t *wsp)
{
dnlc_walk_t *dwp;
if (wsp->walk_addr != 0) {
mdb_warn("dnlc walk doesn't support global walks\n");
return (WALK_ERR);
}
dwp = mdb_zalloc(sizeof (dnlc_walk_t), UM_SLEEP);
if (mdb_readvar(&dwp->dw_hashsz, "nc_hashsz") == -1 ||
dwp->dw_hashsz <= 0) {
mdb_warn("failed to read 'nc_hashsz'\n");
mdb_free(dwp, sizeof (dnlc_walk_t));
return (WALK_ERR);
}
if (dwp->dw_hashsz <= 0) {
mdb_warn("invalid 'nc_hashsz' value\n");
mdb_free(dwp, sizeof (dnlc_walk_t));
return (WALK_ERR);
}
if (mdb_readvar(&dwp->dw_hash, "nc_hash") == -1) {
mdb_warn("failed to read 'nc_hash'\n");
mdb_free(dwp, sizeof (dnlc_walk_t));
return (WALK_ERR);
}
wsp->walk_data = dwp;
return (WALK_NEXT);
}
int
dnlc_walk_step(mdb_walk_state_t *wsp)
{
dnlc_walk_t *dwp = wsp->walk_data;
nc_hash_t hash;
uintptr_t result, addr = wsp->walk_addr;
next:
while (addr == dwp->dw_head || addr == 0) {
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 = 0;
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));
}
|