1 /*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2013, 2016 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef OS_AIX_OS_AIX_HPP
27 #define OS_AIX_OS_AIX_HPP
28
29 // Information about the protection of the page at address '0' on this os.
30 static bool zero_page_read_protected() { return false; }
31
32 // Class Aix defines the interface to the Aix operating systems.
33
34 class Aix {
35 friend class os;
36
37 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
38 // __sigaction(), signal() is loaded
39 static struct sigaction *(*get_signal_action)(int);
40
41 static void check_signal_handler(int sig);
42
43 private:
44
45 static julong _physical_memory;
46 static pthread_t _main_thread;
47 static Mutex* _createThread_lock;
48 static int _page_size;
49
50 // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE)
51 static int _on_pase;
52
53 // 0 = uninitialized, otherwise 16 bit number:
54 // lower 8 bit - minor version
55 // higher 8 bit - major version
56 // For AIX, e.g. 0x0601 for AIX 6.1
57 // for OS/400 e.g. 0x0504 for OS/400 V5R4
58 static uint32_t _os_version;
59
60 // -1 = uninitialized,
61 // 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set)
62 // 1 - SPEC1170 requested (XPG_SUS_ENV is ON)
63 static int _xpg_sus_mode;
64
65 // -1 = uninitialized,
66 // 0 - EXTSHM=OFF or not set
67 // 1 - EXTSHM=ON
68 static int _extshm;
69
70 static julong available_memory();
71 static julong physical_memory() { return _physical_memory; }
72 static void initialize_system_info();
73
74 // OS recognitions (PASE/AIX, OS level) call this before calling any
75 // one of Aix::on_pase(), Aix::os_version().
76 static void initialize_os_info();
77
78 // Scan environment for important settings which might effect the
79 // VM. Trace out settings. Warn about invalid settings and/or
80 // correct them.
81 //
82 // Must run after os::Aix::initialue_os_info().
83 static void scan_environment();
84
85 // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this
86 // before relying on functions from either lib, e.g. Aix::get_meminfo().
87 static void initialize_libo4();
88 static void initialize_libperfstat();
89
90 public:
91 static void init_thread_fpu_state();
92 static pthread_t main_thread(void) { return _main_thread; }
93 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
94 static Mutex* createThread_lock(void) { return _createThread_lock; }
95 static void hotspot_sigmask(Thread* thread);
96
97 // Given an address, returns the size of the page backing that address
98 static size_t query_pagesize(void* p);
99
100 static int page_size(void) {
101 assert(_page_size != -1, "not initialized");
102 return _page_size;
103 }
104
105 static address ucontext_get_pc(const ucontext_t* uc);
106 static intptr_t* ucontext_get_sp(const ucontext_t* uc);
107 static intptr_t* ucontext_get_fp(const ucontext_t* uc);
108 // Set PC into context. Needed for continuation after signal.
109 static void ucontext_set_pc(ucontext_t* uc, address pc);
110
111 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
112
113 // This boolean allows users to forward their own non-matching signals
114 // to JVM_handle_aix_signal, harmlessly.
115 static bool signal_handlers_are_installed;
116
117 static int get_our_sigflags(int);
118 static void set_our_sigflags(int, int);
119 static void signal_sets_init();
120 static void install_signal_handlers();
121 static void set_signal_handler(int, bool);
122
123 static sigset_t* unblocked_signals();
124 static sigset_t* vm_signals();
125
126 // For signal-chaining
127 static struct sigaction *get_chained_signal_action(int sig);
128 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
129
130 // libpthread version string
131 static void libpthread_init();
132
133 // Function returns true if we run on OS/400 (pase), false if we run
134 // on AIX.
135 static bool on_pase() {
136 assert(_on_pase != -1, "not initialized");
137 return _on_pase ? true : false;
138 }
139
140 // Function returns true if we run on AIX, false if we run on OS/400
141 // (pase).
142 static bool on_aix() {
143 assert(_on_pase != -1, "not initialized");
144 return _on_pase ? false : true;
145 }
146
147 // Get 4 byte AIX kernel version number:
148 // highest 2 bytes: Version, Release
149 // if available: lowest 2 bytes: Tech Level, Service Pack.
150 static uint32_t os_version() {
151 assert(_os_version != 0, "not initialized");
152 return _os_version;
153 }
154
155 // 0 = uninitialized, otherwise 16 bit number:
156 // lower 8 bit - minor version
157 // higher 8 bit - major version
158 // For AIX, e.g. 0x0601 for AIX 6.1
159 // for OS/400 e.g. 0x0504 for OS/400 V5R4
160 static int os_version_short() {
161 return os_version() >> 16;
162 }
163
164 // Convenience method: returns true if running on PASE V5R4 or older.
165 static bool on_pase_V5R4_or_older() {
166 return on_pase() && os_version_short() <= 0x0504;
167 }
168
169 // Convenience method: returns true if running on AIX 5.3 or older.
170 static bool on_aix_53_or_older() {
171 return on_aix() && os_version_short() <= 0x0503;
172 }
173
174 // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON).
175 static bool xpg_sus_mode() {
176 assert(_xpg_sus_mode != -1, "not initialized");
177 return _xpg_sus_mode;
178 }
179
180 // Returns true if EXTSHM=ON.
181 static bool extshm() {
182 assert(_extshm != -1, "not initialized");
183 return _extshm;
184 }
185
186 // result struct for get_meminfo()
187 struct meminfo_t {
188
189 // Amount of virtual memory (in units of 4 KB pages)
190 unsigned long long virt_total;
191
192 // Amount of real memory, in bytes
193 unsigned long long real_total;
194
195 // Amount of free real memory, in bytes
196 unsigned long long real_free;
197
198 // Total amount of paging space, in bytes
199 unsigned long long pgsp_total;
200
201 // Amount of free paging space, in bytes
202 unsigned long long pgsp_free;
203
204 };
205
206 // Functions to retrieve memory information on AIX, PASE.
207 // (on AIX, using libperfstat, on PASE with libo4.so).
208 // Returns true if ok, false if error.
209 static bool get_meminfo(meminfo_t* pmi);
210
211 };
212
213 #endif // OS_AIX_OS_AIX_HPP