1 /*

     2  * Copyright (c) 2016 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.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 #include <stdio.h>

    24 #include <sys/ldr.h>

    25 

    26 #include "java_md_aix.h"

    27 

    28 static unsigned char dladdr_buffer[0x4000];

    29 

    30 static int fill_dll_info(void) {

    31     return loadquery(L_GETINFO, dladdr_buffer, sizeof(dladdr_buffer));

    32 }

    33 

    34 static int dladdr_dont_reload(void *addr, Dl_info *info) {

    35     const struct ld_info *p = (struct ld_info *)dladdr_buffer;

    36     memset((void *)info, 0, sizeof(Dl_info));

    37     for (;;) {

    38         if (addr >= p->ldinfo_textorg &&

    39             addr < (((char*)p->ldinfo_textorg) + p->ldinfo_textsize))

    40         {

    41             info->dli_fname = p->ldinfo_filename;

    42             return 1;

    43         }

    44         if (!p->ldinfo_next) {

    45             break;

    46         }

    47         p = (struct ld_info *)(((char *)p) + p->ldinfo_next);

    48     }

    49     return 0;

    50 }

    51 

    52 int dladdr(void *addr, Dl_info *info) {

    53     static int loaded = 0;

    54     int rc = 0;

    55     void *addr0;

    56     if (!addr) {

    57         return rc;

    58     }

    59     if (!loaded) {

    60         if (fill_dll_info() == -1)

    61             return rc;

    62         loaded = 1;

    63     }

    64 

    65     // first try with addr on cached data

    66     rc = dladdr_dont_reload(addr, info);

    67 

    68     // addr could be an AIX function descriptor, so try dereferenced version

    69     if (rc == 0) {

    70         addr0 = *((void **)addr);

    71         rc = dladdr_dont_reload(addr0, info);

    72     }

    73 

    74     // if we had no success until now, maybe loadquery info is outdated.

    75     // refresh and retry

    76     if (rc == 0) {

    77         if (fill_dll_info() == -1)

    78             return rc;

    79         rc = dladdr_dont_reload(addr, info);

    80         if (rc == 0) {

    81             rc = dladdr_dont_reload(addr0, info);

    82         }

    83     }

    84     return rc;

    85 }