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71 rc = dladdr_dont_reload(addr0, info); 72 } 73 74 // if we had no success until now, maybe loadquery info is outdated. 75 // refresh and retry 76 if (rc == 0) { 77 if (fill_dll_info() == -1) 78 return rc; 79 rc = dladdr_dont_reload(addr, info); 80 if (rc == 0) { 81 rc =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 }