1 /*
2 * Copyright (c) 2016, 2019 SAP SE. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 #include <stdio.h>
26 #include <string.h>
27 #include <sys/ldr.h>
28
29 #include "java_md_aix.h"
30
31 static unsigned char dladdr_buffer[0x8000];
32
fill_dll_info(void)33 static int fill_dll_info(void) {
34 return loadquery(L_GETINFO, dladdr_buffer, sizeof(dladdr_buffer));
35 }
36
dladdr_dont_reload(void * addr,Dl_info * info)37 static int dladdr_dont_reload(void *addr, Dl_info *info) {
38 const struct ld_info *p = (struct ld_info *)dladdr_buffer;
39 memset((void *)info, 0, sizeof(Dl_info));
40 for (;;) {
41 if (addr >= p->ldinfo_textorg &&
42 addr < p->ldinfo_textorg + p->ldinfo_textsize) {
43 info->dli_fname = p->ldinfo_filename;
44 return 1;
45 }
46 if (!p->ldinfo_next) {
47 break;
48 }
49 p = (struct ld_info *)(((char *)p) + p->ldinfo_next);
50 }
51 return 0;
52 }
53
dladdr(void * addr,Dl_info * info)54 int dladdr(void *addr, Dl_info *info) {
55 static int loaded = 0;
56 int rc = 0;
57 void *addr0;
58 if (!addr) {
59 return rc;
60 }
61 if (!loaded) {
62 if (fill_dll_info() == -1)
63 return rc;
64 loaded = 1;
65 }
66
67 // first try with addr on cached data
68 rc = dladdr_dont_reload(addr, info);
69
70 // addr could be an AIX function descriptor, so try dereferenced version
71 if (rc == 0) {
72 addr0 = *((void **)addr);
73 rc = dladdr_dont_reload(addr0, info);
74 }
75
76 // if we had no success until now, maybe loadquery info is outdated.
77 // refresh and retry
78 if (rc == 0) {
79 if (fill_dll_info() == -1)
80 return rc;
81 rc = dladdr_dont_reload(addr, info);
82 if (rc == 0) {
83 rc = dladdr_dont_reload(addr0, info);
84 }
85 }
86 return rc;
87 }
88