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.
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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 static struct sigaction *get_preinstalled_handler(int);
41 static void save_preinstalled_handler(int, struct sigaction&);
42
43 static void check_signal_handler(int sig);
44
45 private:
46
47 static julong _physical_memory;
48 static pthread_t _main_thread;
49 static Mutex* _createThread_lock;
50 static int _page_size;
51
52 // -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE)
53 static int _on_pase;
54
55 // 0 = uninitialized, otherwise 16 bit number:
56 // lower 8 bit - minor version
57 // higher 8 bit - major version
58 // For AIX, e.g. 0x0601 for AIX 6.1
59 // for OS/400 e.g. 0x0504 for OS/400 V5R4
60 static uint32_t _os_version;
61
62 // -1 = uninitialized,
63 // 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set)
64 // 1 - SPEC1170 requested (XPG_SUS_ENV is ON)
65 static int _xpg_sus_mode;
66
67 // -1 = uninitialized,
68 // 0 - EXTSHM=OFF or not set
69 // 1 - EXTSHM=ON
70 static int _extshm;
71
72 static julong available_memory();
73 static julong physical_memory() { return _physical_memory; }
74 static void initialize_system_info();
75
76 // OS recognitions (PASE/AIX, OS level) call this before calling any
77 // one of Aix::on_pase(), Aix::os_version().
78 static void initialize_os_info();
79
80 // Scan environment for important settings which might effect the
81 // VM. Trace out settings. Warn about invalid settings and/or
82 // correct them.
83 //
84 // Must run after os::Aix::initialue_os_info().
85 static void scan_environment();
86
87 // Initialize libo4 (on PASE) and libperfstat (on AIX). Call this
88 // before relying on functions from either lib, e.g. Aix::get_meminfo().
89 static void initialize_libo4();
90 static void initialize_libperfstat();
91
92 public:
93 static void init_thread_fpu_state();
94 static pthread_t main_thread(void) { return _main_thread; }
95 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
96 static Mutex* createThread_lock(void) { return _createThread_lock; }
97 static void hotspot_sigmask(Thread* thread);
98
99 // Given an address, returns the size of the page backing that address
100 static size_t query_pagesize(void* p);
101
102 static int page_size(void) {
103 assert(_page_size != -1, "not initialized");
104 return _page_size;
105 }
106
107 static address ucontext_get_pc(const ucontext_t* uc);
108 static intptr_t* ucontext_get_sp(const ucontext_t* uc);
109 static intptr_t* ucontext_get_fp(const ucontext_t* uc);
110 // Set PC into context. Needed for continuation after signal.
111 static void ucontext_set_pc(ucontext_t* uc, address pc);
112
113 static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
114
115 // This boolean allows users to forward their own non-matching signals
116 // to JVM_handle_aix_signal, harmlessly.
117 static bool signal_handlers_are_installed;
118
119 static int get_our_sigflags(int);
120 static void set_our_sigflags(int, int);
121 static void signal_sets_init();
122 static void install_signal_handlers();
123 static void set_signal_handler(int, bool);
124
125 static sigset_t* unblocked_signals();
126 static sigset_t* vm_signals();
127
128 // For signal-chaining
129 static struct sigaction *get_chained_signal_action(int sig);
130 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
131
132 // libpthread version string
133 static void libpthread_init();
134
135 // Function returns true if we run on OS/400 (pase), false if we run
136 // on AIX.
137 static bool on_pase() {
138 assert(_on_pase != -1, "not initialized");
139 return _on_pase ? true : false;
140 }
141
142 // Function returns true if we run on AIX, false if we run on OS/400
143 // (pase).
144 static bool on_aix() {
145 assert(_on_pase != -1, "not initialized");
146 return _on_pase ? false : true;
147 }
148
149 // Get 4 byte AIX kernel version number:
150 // highest 2 bytes: Version, Release
151 // if available: lowest 2 bytes: Tech Level, Service Pack.
152 static uint32_t os_version() {
153 assert(_os_version != 0, "not initialized");
154 return _os_version;
155 }
156
157 // 0 = uninitialized, otherwise 16 bit number:
158 // lower 8 bit - minor version
159 // higher 8 bit - major version
160 // For AIX, e.g. 0x0601 for AIX 6.1
161 // for OS/400 e.g. 0x0504 for OS/400 V5R4
162 static int os_version_short() {
163 return os_version() >> 16;
164 }
165
166 // Convenience method: returns true if running on PASE V5R4 or older.
167 static bool on_pase_V5R4_or_older() {
168 return on_pase() && os_version_short() <= 0x0504;
169 }
170
171 // Convenience method: returns true if running on AIX 5.3 or older.
172 static bool on_aix_53_or_older() {
173 return on_aix() && os_version_short() <= 0x0503;
174 }
175
176 // Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON).
177 static bool xpg_sus_mode() {
178 assert(_xpg_sus_mode != -1, "not initialized");
179 return _xpg_sus_mode;
180 }
181
182 // Returns true if EXTSHM=ON.
183 static bool extshm() {
184 assert(_extshm != -1, "not initialized");
185 return _extshm;
186 }
187
188 // result struct for get_meminfo()
189 struct meminfo_t {
190
191 // Amount of virtual memory (in units of 4 KB pages)
192 unsigned long long virt_total;
193
194 // Amount of real memory, in bytes
195 unsigned long long real_total;
196
197 // Amount of free real memory, in bytes
198 unsigned long long real_free;
199
200 // Total amount of paging space, in bytes
201 unsigned long long pgsp_total;
202
203 // Amount of free paging space, in bytes
204 unsigned long long pgsp_free;
205
206 };
207
208 // Functions to retrieve memory information on AIX, PASE.
209 // (on AIX, using libperfstat, on PASE with libo4.so).
210 // Returns true if ok, false if error.
211 static bool get_meminfo(meminfo_t* pmi);
212
213 };
214
215 #endif // OS_AIX_OS_AIX_HPP