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 33 static int fill_dll_info(void) { 34 return loadquery(L_GETINFO, dladdr_buffer, sizeof(dladdr_buffer)); 35 } 36 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 < (((char*)p->ldinfo_textorg) + p->ldinfo_textsize)) 43 { 44 info->dli_fname = p->ldinfo_filename; 45 return 1; 46 } 47 if (!p->ldinfo_next) { 48 break; 49 } 50 p = (struct ld_info *)(((char *)p) + p->ldinfo_next); 51 } 52 return 0; 53 } 54 55 int dladdr(void *addr, Dl_info *info) { 56 static int loaded = 0; 57 int rc = 0; 58 void *addr0; 59 if (!addr) { 60 return rc; 61 } 62 if (!loaded) { 63 if (fill_dll_info() == -1) 64 return rc; 65 loaded = 1; 66 } 67 68 // first try with addr on cached data 69 rc = dladdr_dont_reload(addr, info); 70 71 // addr could be an AIX function descriptor, so try dereferenced version 72 if (rc == 0) { 73 addr0 = *((void **)addr); 74 rc = dladdr_dont_reload(addr0, info); 75 } 76 77 // if we had no success until now, maybe loadquery info is outdated. 78 // refresh and retry 79 if (rc == 0) { 80 if (fill_dll_info() == -1) 81 return rc; 82 rc = dladdr_dont_reload(addr, info); 83 if (rc == 0) { 84 rc = dladdr_dont_reload(addr0, info); 85 } 86 } 87 return rc; 88 }