Mercurial > hg > truffle
diff src/os/aix/vm/porting_aix.hpp @ 14415:666e6ce3976c
8023038: PPC64 (part 15): Platform files for AIX/PPC64 support
Reviewed-by: kvn
author | simonis |
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date | Fri, 06 Sep 2013 20:16:09 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/aix/vm/porting_aix.hpp Fri Sep 06 20:16:09 2013 +0200 @@ -0,0 +1,81 @@ +/* + * Copyright 2012, 2013 SAP AG. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + * + */ + +#include <stddef.h> + +// Header file to contain porting-relevant code which does not have a +// home anywhere else and which can not go into os_<platform>.h because +// that header is included inside the os class definition, hence all +// its content is part of the os class. + +// Aix' own version of dladdr(). +// This function tries to mimick dladdr(3) on Linux +// (see http://linux.die.net/man/3/dladdr) +// dladdr(3) is not POSIX but a GNU extension, and is not available on AIX. +// +// Differences between AIX dladdr and Linux dladdr: +// +// 1) Dl_info.dli_fbase: can never work, is disabled. +// A loaded image on AIX is divided in multiple segments, at least two +// (text and data) but potentially also far more. This is because the loader may +// load each member into an own segment, as for instance happens with the libC.a +// 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a +// zero-length string is returned (""). +// 3) Dl_info.dli_saddr: For code, this will return the entry point of the function, +// not the function descriptor. + +typedef struct { + const char *dli_fname; // file path of loaded library + // void *dli_fbase; + const char *dli_sname; // symbol name; "" if not known + void *dli_saddr; // address of *entry* of function; not function descriptor; +} Dl_info; + +// Note: we export this to use it inside J2se too +#ifdef __cplusplus +extern "C" +#endif +int dladdr(void *addr, Dl_info *info); + + +// The semantics in this file are thus that codeptr_t is a *real code ptr*. +// This means that any function taking codeptr_t as arguments will assume +// a real codeptr and won't handle function descriptors (eg getFuncName), +// whereas functions taking address as args will deal with function +// descriptors (eg os::dll_address_to_library_name). +typedef unsigned int* codeptr_t; + +// helper function - given a program counter, tries to locate the traceback table and +// returns info from it (like, most importantly, function name, displacement of the +// pc inside the function, and the traceback table itself. +#ifdef __cplusplus +extern "C" +#endif +int getFuncName( + codeptr_t pc, // [in] program counter + char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name + int* p_displacement, // [out] optional: displacement + const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information + char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages + );