1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/os/aix/vm/porting_aix.hpp Fri Sep 06 20:16:09 2013 +0200
1.3 @@ -0,0 +1,81 @@
1.4 +/*
1.5 + * Copyright 2012, 2013 SAP AG. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include <stddef.h>
1.29 +
1.30 +// Header file to contain porting-relevant code which does not have a
1.31 +// home anywhere else and which can not go into os_<platform>.h because
1.32 +// that header is included inside the os class definition, hence all
1.33 +// its content is part of the os class.
1.34 +
1.35 +// Aix' own version of dladdr().
1.36 +// This function tries to mimick dladdr(3) on Linux
1.37 +// (see http://linux.die.net/man/3/dladdr)
1.38 +// dladdr(3) is not POSIX but a GNU extension, and is not available on AIX.
1.39 +//
1.40 +// Differences between AIX dladdr and Linux dladdr:
1.41 +//
1.42 +// 1) Dl_info.dli_fbase: can never work, is disabled.
1.43 +// A loaded image on AIX is divided in multiple segments, at least two
1.44 +// (text and data) but potentially also far more. This is because the loader may
1.45 +// load each member into an own segment, as for instance happens with the libC.a
1.46 +// 2) Dl_info.dli_sname: This only works for code symbols (functions); for data, a
1.47 +// zero-length string is returned ("").
1.48 +// 3) Dl_info.dli_saddr: For code, this will return the entry point of the function,
1.49 +// not the function descriptor.
1.50 +
1.51 +typedef struct {
1.52 + const char *dli_fname; // file path of loaded library
1.53 + // void *dli_fbase;
1.54 + const char *dli_sname; // symbol name; "" if not known
1.55 + void *dli_saddr; // address of *entry* of function; not function descriptor;
1.56 +} Dl_info;
1.57 +
1.58 +// Note: we export this to use it inside J2se too
1.59 +#ifdef __cplusplus
1.60 +extern "C"
1.61 +#endif
1.62 +int dladdr(void *addr, Dl_info *info);
1.63 +
1.64 +
1.65 +// The semantics in this file are thus that codeptr_t is a *real code ptr*.
1.66 +// This means that any function taking codeptr_t as arguments will assume
1.67 +// a real codeptr and won't handle function descriptors (eg getFuncName),
1.68 +// whereas functions taking address as args will deal with function
1.69 +// descriptors (eg os::dll_address_to_library_name).
1.70 +typedef unsigned int* codeptr_t;
1.71 +
1.72 +// helper function - given a program counter, tries to locate the traceback table and
1.73 +// returns info from it (like, most importantly, function name, displacement of the
1.74 +// pc inside the function, and the traceback table itself.
1.75 +#ifdef __cplusplus
1.76 +extern "C"
1.77 +#endif
1.78 +int getFuncName(
1.79 + codeptr_t pc, // [in] program counter
1.80 + char* p_name, size_t namelen, // [out] optional: user provided buffer for the function name
1.81 + int* p_displacement, // [out] optional: displacement
1.82 + const struct tbtable** p_tb, // [out] optional: ptr to traceback table to get further information
1.83 + char* p_errmsg, size_t errmsglen // [out] optional: user provided buffer for error messages
1.84 + );
