1 /*
   2  * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_BSD_VM_OS_BSD_HPP
  26 #define OS_BSD_VM_OS_BSD_HPP
  27 
  28 // Bsd_OS defines the interface to Bsd operating systems
  29 
  30 // Information about the protection of the page at address '0' on this os.
  31 static bool zero_page_read_protected() { return true; }
  32 
  33 #ifdef __APPLE__
  34 // Mac OS X doesn't support clock_gettime. Stub out the type, it is
  35 // unused
  36 typedef int clockid_t;
  37 #endif
  38 
  39 class Bsd {
  40   friend class os;
  41 
  42   // For signal-chaining
  43   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
  44                                         // __sigaction(), signal() is loaded
  45   static struct sigaction *(*get_signal_action)(int);
  46   static struct sigaction *get_preinstalled_handler(int);
  47   static void save_preinstalled_handler(int, struct sigaction&);
  48 
  49   static void check_signal_handler(int sig);
  50 
  51 #ifdef __APPLE__
  52   // mach_absolute_time
  53   static mach_timebase_info_data_t _timebase_info;
  54   static volatile uint64_t         _max_abstime;
  55 #else
  56   static int (*_clock_gettime)(clockid_t, struct timespec *);
  57 #endif
  58 
  59   static GrowableArray<int>* _cpu_to_node;
  60 
  61  protected:
  62 
  63   static julong _physical_memory;
  64   static pthread_t _main_thread;
  65   static int _page_size;
  66 
  67   static julong available_memory();
  68   static julong physical_memory() { return _physical_memory; }
  69   static void initialize_system_info();
  70 
  71   static void rebuild_cpu_to_node_map();
  72   static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
  73 
  74   static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
  75 
  76  public:
  77 
  78   static void init_thread_fpu_state();
  79   static pthread_t main_thread(void)                                { return _main_thread; }
  80 
  81   static void hotspot_sigmask(Thread* thread);
  82 
  83   static bool is_initial_thread(void);
  84   static pid_t gettid();
  85 
  86   static int page_size(void)                                        { return _page_size; }
  87   static void set_page_size(int val)                                { _page_size = val; }
  88 
  89   static address   ucontext_get_pc(const ucontext_t* uc);
  90   static void ucontext_set_pc(ucontext_t* uc, address pc);
  91   static intptr_t* ucontext_get_sp(const ucontext_t* uc);
  92   static intptr_t* ucontext_get_fp(const ucontext_t* uc);
  93 
  94   // For Analyzer Forte AsyncGetCallTrace profiling support:
  95   //
  96   // This interface should be declared in os_bsd_i486.hpp, but
  97   // that file provides extensions to the os class and not the
  98   // Bsd class.
  99   static ExtendedPC fetch_frame_from_ucontext(Thread* thread, const ucontext_t* uc,
 100                                               intptr_t** ret_sp, intptr_t** ret_fp);
 101 
 102   static bool get_frame_at_stack_banging_point(JavaThread* thread, ucontext_t* uc, frame* fr);
 103 
 104   // This boolean allows users to forward their own non-matching signals
 105   // to JVM_handle_bsd_signal, harmlessly.
 106   static bool signal_handlers_are_installed;
 107 
 108   static int get_our_sigflags(int);
 109   static void set_our_sigflags(int, int);
 110   static void signal_sets_init();
 111   static void install_signal_handlers();
 112   static void set_signal_handler(int, bool);
 113   static bool is_sig_ignored(int sig);
 114 
 115   static sigset_t* unblocked_signals();
 116   static sigset_t* vm_signals();
 117 
 118   // For signal-chaining
 119   static struct sigaction *get_chained_signal_action(int sig);
 120   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
 121 
 122   // Real-time clock functions
 123   static void clock_init(void);
 124 
 125   // Stack repair handling
 126 
 127   // none present
 128 
 129  private:
 130   typedef int (*sched_getcpu_func_t)(void);
 131   typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
 132   typedef int (*numa_max_node_func_t)(void);
 133   typedef int (*numa_available_func_t)(void);
 134   typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
 135   typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
 136 
 137   static sched_getcpu_func_t _sched_getcpu;
 138   static numa_node_to_cpus_func_t _numa_node_to_cpus;
 139   static numa_max_node_func_t _numa_max_node;
 140   static numa_available_func_t _numa_available;
 141   static numa_tonode_memory_func_t _numa_tonode_memory;
 142   static numa_interleave_memory_func_t _numa_interleave_memory;
 143   static unsigned long* _numa_all_nodes;
 144 
 145   static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
 146   static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
 147   static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
 148   static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
 149   static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
 150   static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
 151   static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
 152  public:
 153   static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
 154   static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
 155     return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
 156   }
 157   static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
 158   static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
 159   static int numa_tonode_memory(void *start, size_t size, int node) {
 160     return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
 161   }
 162   static void numa_interleave_memory(void *start, size_t size) {
 163     if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
 164       _numa_interleave_memory(start, size, _numa_all_nodes);
 165     }
 166   }
 167   static int get_node_by_cpu(int cpu_id);
 168 };
 169 
 170 #endif // OS_BSD_VM_OS_BSD_HPP