branch.isa revision 6259
16019Shines@cs.fsu.edu// -*- mode:c++ -*- 26019Shines@cs.fsu.edu 36019Shines@cs.fsu.edu// Copyright (c) 2007-2008 The Florida State University 46019Shines@cs.fsu.edu// All rights reserved. 56019Shines@cs.fsu.edu// 66019Shines@cs.fsu.edu// Redistribution and use in source and binary forms, with or without 76019Shines@cs.fsu.edu// modification, are permitted provided that the following conditions are 86019Shines@cs.fsu.edu// met: redistributions of source code must retain the above copyright 96019Shines@cs.fsu.edu// notice, this list of conditions and the following disclaimer; 106019Shines@cs.fsu.edu// redistributions in binary form must reproduce the above copyright 116019Shines@cs.fsu.edu// notice, this list of conditions and the following disclaimer in the 126019Shines@cs.fsu.edu// documentation and/or other materials provided with the distribution; 136019Shines@cs.fsu.edu// neither the name of the copyright holders nor the names of its 146019Shines@cs.fsu.edu// contributors may be used to endorse or promote products derived from 156019Shines@cs.fsu.edu// this software without specific prior written permission. 166019Shines@cs.fsu.edu// 176019Shines@cs.fsu.edu// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 186019Shines@cs.fsu.edu// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 196019Shines@cs.fsu.edu// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 206019Shines@cs.fsu.edu// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 216019Shines@cs.fsu.edu// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 226019Shines@cs.fsu.edu// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 236019Shines@cs.fsu.edu// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 246019Shines@cs.fsu.edu// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 256019Shines@cs.fsu.edu// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 266019Shines@cs.fsu.edu// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 276019Shines@cs.fsu.edu// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 286019Shines@cs.fsu.edu// 296019Shines@cs.fsu.edu// Authors: Stephen Hines 306019Shines@cs.fsu.edu 316019Shines@cs.fsu.edu//////////////////////////////////////////////////////////////////// 326019Shines@cs.fsu.edu// 336019Shines@cs.fsu.edu// Control transfer instructions 346019Shines@cs.fsu.edu// 356019Shines@cs.fsu.edu 366019Shines@cs.fsu.edudef format Branch(code,*opt_flags) {{ 376019Shines@cs.fsu.edu 386019Shines@cs.fsu.edu #Build Instruction Flags 396019Shines@cs.fsu.edu #Use Link & Likely Flags to Add Link/Condition Code 406019Shines@cs.fsu.edu inst_flags = ('IsDirectControl', ) 416259Sjack-m5ml2@cs.york.ac.uk linking = False 426019Shines@cs.fsu.edu for x in opt_flags: 436019Shines@cs.fsu.edu if x == 'Link': 446259Sjack-m5ml2@cs.york.ac.uk linking = True 456019Shines@cs.fsu.edu code += 'LR = NPC;\n' 466019Shines@cs.fsu.edu else: 476019Shines@cs.fsu.edu inst_flags += (x, ) 486019Shines@cs.fsu.edu 496019Shines@cs.fsu.edu #Take into account uncond. branch instruction 506019Shines@cs.fsu.edu if 'cond == 1' in code: 516019Shines@cs.fsu.edu inst_flags += ('IsUnCondControl', ) 526019Shines@cs.fsu.edu else: 536019Shines@cs.fsu.edu inst_flags += ('IsCondControl', ) 546019Shines@cs.fsu.edu 556243Sgblack@eecs.umich.edu icode = 'if (testPredicate(Cpsr, condCode)) {\n' 566019Shines@cs.fsu.edu icode += code 576019Shines@cs.fsu.edu icode += ' NPC = NPC + 4 + disp;\n' 586019Shines@cs.fsu.edu icode += '} else {\n' 596019Shines@cs.fsu.edu icode += ' NPC = NPC;\n' 606259Sjack-m5ml2@cs.york.ac.uk if linking: 616259Sjack-m5ml2@cs.york.ac.uk icode += ' LR = LR;\n' 626019Shines@cs.fsu.edu icode += '};\n' 636019Shines@cs.fsu.edu 646019Shines@cs.fsu.edu code = icode 656019Shines@cs.fsu.edu 666019Shines@cs.fsu.edu iop = InstObjParams(name, Name, 'Branch', code, inst_flags) 676019Shines@cs.fsu.edu header_output = BasicDeclare.subst(iop) 686019Shines@cs.fsu.edu decoder_output = BasicConstructor.subst(iop) 696019Shines@cs.fsu.edu decode_block = BasicDecode.subst(iop) 706019Shines@cs.fsu.edu exec_output = BasicExecute.subst(iop) 716019Shines@cs.fsu.edu}}; 726019Shines@cs.fsu.edu 736019Shines@cs.fsu.edudef format BranchExchange(code,*opt_flags) {{ 746019Shines@cs.fsu.edu #Build Instruction Flags 756019Shines@cs.fsu.edu #Use Link & Likely Flags to Add Link/Condition Code 766019Shines@cs.fsu.edu inst_flags = ('IsIndirectControl', ) 776259Sjack-m5ml2@cs.york.ac.uk linking = False 786019Shines@cs.fsu.edu for x in opt_flags: 796019Shines@cs.fsu.edu if x == 'Link': 806259Sjack-m5ml2@cs.york.ac.uk linking = True 816019Shines@cs.fsu.edu code += 'LR = NPC;\n' 826019Shines@cs.fsu.edu else: 836019Shines@cs.fsu.edu inst_flags += (x, ) 846019Shines@cs.fsu.edu 856019Shines@cs.fsu.edu #Take into account uncond. branch instruction 866019Shines@cs.fsu.edu if 'cond == 1' in code: 876019Shines@cs.fsu.edu inst_flags += ('IsUnCondControl', ) 886019Shines@cs.fsu.edu else: 896019Shines@cs.fsu.edu inst_flags += ('IsCondControl', ) 906019Shines@cs.fsu.edu 916019Shines@cs.fsu.edu #Condition code 926019Shines@cs.fsu.edu 936243Sgblack@eecs.umich.edu icode = 'if (testPredicate(Cpsr, condCode)) {\n' 946019Shines@cs.fsu.edu icode += code 956019Shines@cs.fsu.edu icode += ' NPC = Rm & 0xfffffffe; // Masks off bottom bit\n' 966019Shines@cs.fsu.edu icode += '} else {\n' 976019Shines@cs.fsu.edu icode += ' NPC = NPC;\n' 986259Sjack-m5ml2@cs.york.ac.uk if linking: 996259Sjack-m5ml2@cs.york.ac.uk icode += ' LR = LR;\n' 1006019Shines@cs.fsu.edu icode += '};\n' 1016019Shines@cs.fsu.edu 1026019Shines@cs.fsu.edu code = icode 1036019Shines@cs.fsu.edu 1046019Shines@cs.fsu.edu iop = InstObjParams(name, Name, 'BranchExchange', code, inst_flags) 1056019Shines@cs.fsu.edu header_output = BasicDeclare.subst(iop) 1066019Shines@cs.fsu.edu decoder_output = BasicConstructor.subst(iop) 1076019Shines@cs.fsu.edu decode_block = BasicDecode.subst(iop) 1086019Shines@cs.fsu.edu exec_output = BasicExecute.subst(iop) 1096019Shines@cs.fsu.edu}}; 1106019Shines@cs.fsu.edu 1116019Shines@cs.fsu.edudef format Jump(code, *opt_flags) {{ 1126019Shines@cs.fsu.edu #Build Instruction Flags 1136019Shines@cs.fsu.edu #Use Link Flag to Add Link Code 1146019Shines@cs.fsu.edu inst_flags = ('IsIndirectControl', 'IsUncondControl') 1156019Shines@cs.fsu.edu for x in opt_flags: 1166019Shines@cs.fsu.edu if x == 'Link': 1176019Shines@cs.fsu.edu code = 'LR = NPC;\n' + code 1186019Shines@cs.fsu.edu elif x == 'ClearHazards': 1196019Shines@cs.fsu.edu code += '/* Code Needed to Clear Execute & Inst Hazards */\n' 1206019Shines@cs.fsu.edu else: 1216019Shines@cs.fsu.edu inst_flags += (x, ) 1226019Shines@cs.fsu.edu 1236019Shines@cs.fsu.edu iop = InstObjParams(name, Name, 'Jump', code, inst_flags) 1246019Shines@cs.fsu.edu header_output = BasicDeclare.subst(iop) 1256019Shines@cs.fsu.edu decoder_output = BasicConstructor.subst(iop) 1266019Shines@cs.fsu.edu decode_block = BasicDecode.subst(iop) 1276019Shines@cs.fsu.edu exec_output = BasicExecute.subst(iop) 1286019Shines@cs.fsu.edu #exec_output = PredOpExecute.subst(iop) 1296019Shines@cs.fsu.edu}}; 1306019Shines@cs.fsu.edu 1316019Shines@cs.fsu.edu 132