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