1 /* 2 * Copyright 2012, 2013 SAP AG. 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 */ 24 25 #include <stddef.h> 26 27 // Header file to contain porting-relevant code which does not have a 28 // home anywhere else and which can not go into os_<platform>.h because 29 // that header is included inside the os class definition, hence all 30 // its content is part of the os class. 31 32 // Aix' own version of dladdr(). 33 // This function tries to mimick dladdr(3) on Linux 34 // (see http://linux.die.net/man/3/dladdr) 35 // dladdr(3) is not POSIX but a GNU extension, and is not available on AIX. 36 // 37 // Differences between AIX dladdr and Linux dladdr: 38 // 39 // 1) Dl_info.dli_fbase: can never work, is disabled. 40 // A loaded image on AIX is divided in multiple segments, at least two 41 // (text and data) but potentially also far more. This is because the loader may 42 // load each member into an own segment, as for instance happens with the libC.a 43 // 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a 44 // zero-length string is returned (""). 45 // 3) Dl_info.dli_saddr: For code, this will return the entry point of the function, 46 // not the function descriptor. 47 48 typedef struct { 49 const char *dli_fname; // file path of loaded library 50 // void *dli_fbase; 51 const char *dli_sname; // symbol name; "" if not known 52 void *dli_saddr; // address of *entry* of function; not function descriptor; 53 } Dl_info; 54 55 // Note: we export this to use it inside J2se too 56 #ifdef __cplusplus 57 extern "C" 58 #endif 59 int dladdr(void *addr, Dl_info *info); 60 61 62 // The semantics in this file are thus that codeptr_t is a *real code ptr*. 63 // This means that any function taking codeptr_t as arguments will assume 64 // a real codeptr and won't handle function descriptors (eg getFuncName), 65 // whereas functions taking address as args will deal with function 66 // descriptors (eg os::dll_address_to_library_name). 67 typedef unsigned int* codeptr_t; 68 69 // helper function - given a program counter, tries to locate the traceback table and 70 // returns info from it (like, most importantly, function name, displacement of the 71 // pc inside the function, and the traceback table itself. 72 #ifdef __cplusplus 73 extern "C" 74 #endif 75 int getFuncName( 76 codeptr_t pc, // [in] program counter 77 char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name 78 int* p_displacement, // [out] optional: displacement 79 const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information 80 char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages 81 );