211 lines
6.7 KiB
C++
211 lines
6.7 KiB
C++
/*
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* Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2013, 2016 SAP SE. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef OS_AIX_OS_AIX_HPP
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#define OS_AIX_OS_AIX_HPP
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// Information about the protection of the page at address '0' on this os.
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static bool zero_page_read_protected() { return false; }
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// Class Aix defines the interface to the Aix operating systems.
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class Aix {
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friend class os;
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static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
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// __sigaction(), signal() is loaded
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static struct sigaction *(*get_signal_action)(int);
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static void check_signal_handler(int sig);
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private:
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static julong _physical_memory;
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static pthread_t _main_thread;
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static int _page_size;
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// -1 = uninitialized, 0 = AIX, 1 = OS/400 (PASE)
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static int _on_pase;
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// 0 = uninitialized, otherwise 16 bit number:
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// lower 8 bit - minor version
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// higher 8 bit - major version
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// For AIX, e.g. 0x0601 for AIX 6.1
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// for OS/400 e.g. 0x0504 for OS/400 V5R4
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static uint32_t _os_version;
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// -1 = uninitialized,
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// 0 - SPEC1170 not requested (XPG_SUS_ENV is OFF or not set)
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// 1 - SPEC1170 requested (XPG_SUS_ENV is ON)
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static int _xpg_sus_mode;
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// -1 = uninitialized,
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// 0 - EXTSHM=OFF or not set
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// 1 - EXTSHM=ON
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static int _extshm;
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static julong available_memory();
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static julong physical_memory() { return _physical_memory; }
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static void initialize_system_info();
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// OS recognitions (PASE/AIX, OS level) call this before calling any
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// one of Aix::on_pase(), Aix::os_version().
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static void initialize_os_info();
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// Scan environment for important settings which might effect the
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// VM. Trace out settings. Warn about invalid settings and/or
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// correct them.
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//
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// Must run after os::Aix::initialue_os_info().
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static void scan_environment();
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// Initialize libo4 (on PASE) and libperfstat (on AIX). Call this
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// before relying on functions from either lib, e.g. Aix::get_meminfo().
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static void initialize_libo4();
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static void initialize_libperfstat();
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public:
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static void init_thread_fpu_state();
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static pthread_t main_thread(void) { return _main_thread; }
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static void hotspot_sigmask(Thread* thread);
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// Given an address, returns the size of the page backing that address
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static size_t query_pagesize(void* p);
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static int page_size(void) {
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assert(_page_size != -1, "not initialized");
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return _page_size;
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}
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static address ucontext_get_pc(const ucontext_t* uc);
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static intptr_t* ucontext_get_sp(const ucontext_t* uc);
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static intptr_t* ucontext_get_fp(const ucontext_t* uc);
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// Set PC into context. Needed for continuation after signal.
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static void ucontext_set_pc(ucontext_t* uc, address pc);
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static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
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// This boolean allows users to forward their own non-matching signals
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// to JVM_handle_aix_signal, harmlessly.
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static bool signal_handlers_are_installed;
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static int get_our_sigflags(int);
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static void set_our_sigflags(int, int);
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static void signal_sets_init();
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static void install_signal_handlers();
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static void set_signal_handler(int, bool);
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static sigset_t* unblocked_signals();
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static sigset_t* vm_signals();
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// For signal-chaining
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static struct sigaction *get_chained_signal_action(int sig);
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static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
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// libpthread version string
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static void libpthread_init();
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// Function returns true if we run on OS/400 (pase), false if we run
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// on AIX.
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static bool on_pase() {
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assert(_on_pase != -1, "not initialized");
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return _on_pase ? true : false;
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}
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// Function returns true if we run on AIX, false if we run on OS/400
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// (pase).
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static bool on_aix() {
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assert(_on_pase != -1, "not initialized");
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return _on_pase ? false : true;
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}
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// Get 4 byte AIX kernel version number:
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// highest 2 bytes: Version, Release
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// if available: lowest 2 bytes: Tech Level, Service Pack.
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static uint32_t os_version() {
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assert(_os_version != 0, "not initialized");
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return _os_version;
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}
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// 0 = uninitialized, otherwise 16 bit number:
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// lower 8 bit - minor version
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// higher 8 bit - major version
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// For AIX, e.g. 0x0601 for AIX 6.1
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// for OS/400 e.g. 0x0504 for OS/400 V5R4
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static int os_version_short() {
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return os_version() >> 16;
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}
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// Convenience method: returns true if running on PASE V5R4 or older.
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static bool on_pase_V5R4_or_older() {
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return on_pase() && os_version_short() <= 0x0504;
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}
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// Convenience method: returns true if running on AIX 5.3 or older.
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static bool on_aix_53_or_older() {
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return on_aix() && os_version_short() <= 0x0503;
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}
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// Returns true if we run in SPEC1170 compliant mode (XPG_SUS_ENV=ON).
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static bool xpg_sus_mode() {
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assert(_xpg_sus_mode != -1, "not initialized");
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return _xpg_sus_mode;
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}
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// Returns true if EXTSHM=ON.
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static bool extshm() {
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assert(_extshm != -1, "not initialized");
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return _extshm;
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}
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// result struct for get_meminfo()
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struct meminfo_t {
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// Amount of virtual memory (in units of 4 KB pages)
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unsigned long long virt_total;
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// Amount of real memory, in bytes
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unsigned long long real_total;
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// Amount of free real memory, in bytes
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unsigned long long real_free;
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// Total amount of paging space, in bytes
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unsigned long long pgsp_total;
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// Amount of free paging space, in bytes
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unsigned long long pgsp_free;
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};
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// Functions to retrieve memory information on AIX, PASE.
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// (on AIX, using libperfstat, on PASE with libo4.so).
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// Returns true if ok, false if error.
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static bool get_meminfo(meminfo_t* pmi);
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};
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#endif // OS_AIX_OS_AIX_HPP
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