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