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// -*- mode:c++ -*-
// Copyright (c) 2007-2008 The Florida State University
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met: redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer;
// redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution;
// neither the name of the copyright holders nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Authors: Stephen Hines
////////////////////////////////////////////////////////////////////
//
// Control transfer instructions
//
def format Branch(code,*opt_flags) {{
#Build Instruction Flags
#Use Link & Likely Flags to Add Link/Condition Code
inst_flags = ('IsDirectControl', )
linking = False
for x in opt_flags:
if x == 'Link':
linking = True
code += 'LR = NPC;\n'
else:
inst_flags += (x, )
#Take into account uncond. branch instruction
if 'cond == 1' in code:
inst_flags += ('IsUnCondControl', )
else:
inst_flags += ('IsCondControl', )
icode = 'if (testPredicate(CondCodes, condCode)) {\n'
icode += code
icode += ' NPC = NPC + 4 + disp;\n'
icode += '} else {\n'
icode += ' NPC = NPC;\n'
if linking:
icode += ' LR = LR;\n'
icode += '};\n'
code = icode
iop = InstObjParams(name, Name, 'Branch', code, inst_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
decode_block = BasicDecode.subst(iop)
exec_output = BasicExecute.subst(iop)
}};
def format BranchExchange(code,*opt_flags) {{
#Build Instruction Flags
#Use Link & Likely Flags to Add Link/Condition Code
inst_flags = ('IsIndirectControl', )
linking = False
for x in opt_flags:
if x == 'Link':
linking = True
code += 'LR = NPC;\n'
else:
inst_flags += (x, )
#Take into account uncond. branch instruction
if 'cond == 1' in code:
inst_flags += ('IsUnCondControl', )
else:
inst_flags += ('IsCondControl', )
#Condition code
icode = 'if (testPredicate(CondCodes, condCode)) {\n'
icode += code
icode += ' NPC = Rm & 0xfffffffe; // Masks off bottom bit\n'
icode += '} else {\n'
icode += ' NPC = NPC;\n'
if linking:
icode += ' LR = LR;\n'
icode += '};\n'
code = icode
iop = InstObjParams(name, Name, 'BranchExchange', code, inst_flags)
header_output = BasicDeclare.subst(iop)
decoder_output = BasicConstructor.subst(iop)
decode_block = BasicDecode.subst(iop)
exec_output = BasicExecute.subst(iop)
}};
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