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comparison src/os/aix/vm/porting_aix.hpp @ 14415:666e6ce3976c

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8023038: PPC64 (part 15): Platform files for AIX/PPC64 support Reviewed-by: kvn
author simonis
date Fri, 06 Sep 2013 20:16:09 +0200
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14414:b83f7d608548 14415:666e6ce3976c
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 );