1 /*
   2  * Copyright 1999-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_assembler_solaris_x86_32.cpp.incl"
  27 
  28 
  29 void MacroAssembler::int3() {
  30   pushl(rax);
  31   pushl(rdx);
  32   pushl(rcx);
  33   call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
  34   popl(rcx);
  35   popl(rdx);
  36   popl(rax);
  37 }
  38 
  39 void MacroAssembler::get_thread(Register thread) {
  40 
  41   // Try to emit a Solaris-specific fast TSD/TLS accessor.
  42   ThreadLocalStorage::pd_tlsAccessMode tlsMode = ThreadLocalStorage::pd_getTlsAccessMode () ;
  43   if (tlsMode == ThreadLocalStorage::pd_tlsAccessIndirect) {            // T1
  44      // Use thread as a temporary: mov r, gs:[0]; mov r, [r+tlsOffset]
  45      emit_byte (Assembler::GS_segment) ;
  46      // ExternalAddress doesn't work because it can't take NULL
  47      AddressLiteral null(0, relocInfo::none);
  48      movptr (thread, null);
  49      movl (thread, Address(thread, ThreadLocalStorage::pd_getTlsOffset())) ;
  50      return ;
  51   } else
  52   if (tlsMode == ThreadLocalStorage::pd_tlsAccessDirect) {              // T2
  53      // mov r, gs:[tlsOffset]
  54      emit_byte (Assembler::GS_segment) ;
  55      AddressLiteral tls((address)ThreadLocalStorage::pd_getTlsOffset(), relocInfo::none);
  56      movptr (thread, tls);
  57      return ;
  58   }
  59 
  60   // slow call to of thr_getspecific
  61   // int thr_getspecific(thread_key_t key, void **value);
  62   // Consider using pthread_getspecific instead.
  63 
  64   pushl(0);                                                             // allocate space for return value
  65   if (thread != rax) pushl(rax);                                        // save rax, if caller still wants it
  66   pushl(rcx);                                                           // save caller save
  67   pushl(rdx);                                                           // save caller save
  68   if (thread != rax) {
  69     leal(thread, Address(rsp, 3 * sizeof(int)));                        // address of return value
  70   } else {
  71     leal(thread, Address(rsp, 2 * sizeof(int)));                        // address of return value
  72   }
  73   pushl(thread);                                                        // and pass the address
  74   pushl(ThreadLocalStorage::thread_index());                            // the key
  75   call(RuntimeAddress(CAST_FROM_FN_PTR(address, thr_getspecific)));
  76   increment(rsp, 2 * wordSize);
  77   popl(rdx);
  78   popl(rcx);
  79   if (thread != rax) popl(rax);
  80   popl(thread);
  81 }
  82 
  83 bool MacroAssembler::needs_explicit_null_check(int offset) {
  84   // Identical to Sparc/Solaris code
  85   bool offset_in_first_page =   0 <= offset  &&  offset < os::vm_page_size();
  86   return !offset_in_first_page;
  87 }