1 /*
   2  * Copyright (c) 1997, 2012, 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 #include "precompiled.hpp"
  26 #include "asm/assembler.hpp"
  27 #include "asm/assembler.inline.hpp"
  28 
  29 #include "assembler_sparc.hpp"
  30 
  31 int AbstractAssembler::code_fill_byte() {
  32   return 0x00;                  // illegal instruction 0x00000000
  33 }
  34 
  35 #ifdef VALIDATE_PIPELINE
  36 /* Walk over the current code section and verify that there are no obvious
  37  * pipeline hazards exposed in the code generated.
  38  */
  39 void Assembler::validate_no_pipeline_hazards() {
  40   const CodeSection* csect = code_section();
  41 
  42   address addr0 = csect->start();
  43   address addrN = csect->end();
  44   uint32_t prev = 0;
  45 
  46   assert((addrN - addr0) % BytesPerInstWord == 0, "must be");
  47 
  48   for (address pc = addr0; pc != addrN; pc += BytesPerInstWord) {
  49     uint32_t insn = *reinterpret_cast<uint32_t*>(pc);
  50 
  51     // 1. General case: No CTI immediately after other CTI
  52     assert(!(is_cti(prev) && is_cti(insn)), "CTI-CTI not allowed.");
  53 
  54     // 2. Special case: No CTI immediately after/before RDPC
  55     assert(!(is_cti(prev) && is_rdpc(insn)), "CTI-RDPC not allowed.");
  56     assert(!(is_rdpc(prev) && is_cti(insn)), "RDPC-CTI not allowed.");
  57 
  58     prev = insn;
  59   }
  60 }
  61 #endif