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/*
* Copyright (c) 2010 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* 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
*/
#include "arch/arm/insts/macromem.hh"
#include "arch/arm/decoder.hh"
using namespace ArmISAInst;
namespace ArmISA
{
MacroMemOp::MacroMemOp(const char *mnem, ExtMachInst machInst,
OpClass __opClass, IntRegIndex rn,
bool index, bool up, bool user, bool writeback,
bool load, uint32_t reglist) :
PredMacroOp(mnem, machInst, __opClass)
{
uint32_t regs = reglist;
uint32_t ones = number_of_ones(reglist);
// Remember that writeback adds a uop
numMicroops = ones + (writeback ? 1 : 0) + 1;
microOps = new StaticInstPtr[numMicroops];
uint32_t addr = 0;
if (!up)
addr = (ones << 2) - 4;
if (!index)
addr += 4;
StaticInstPtr *uop = microOps;
StaticInstPtr wbUop;
if (writeback) {
if (up) {
wbUop = new MicroAddiUop(machInst, rn, rn, ones * 4);
} else {
wbUop = new MicroSubiUop(machInst, rn, rn, ones * 4);
}
}
// Add 0 to Rn and stick it in ureg0.
// This is equivalent to a move.
*uop = new MicroAddiUop(machInst, INTREG_UREG0, rn, 0);
// Write back at the start for loads. This covers the ldm exception return
// case where the base needs to be written in the old mode. Stores may need
// the original value of the base, but they don't change mode and can
// write back at the end like before.
if (load && writeback) {
*++uop = wbUop;
}
unsigned reg = 0;
bool force_user = user & !bits(reglist, 15);
bool exception_ret = user & bits(reglist, 15);
for (int i = 0; i < ones; i++) {
// Find the next register.
while (!bits(regs, reg))
reg++;
replaceBits(regs, reg, 0);
unsigned regIdx = reg;
if (force_user) {
regIdx = intRegInMode(MODE_USER, regIdx);
}
if (load) {
if (reg == INTREG_PC && exception_ret) {
// This must be the exception return form of ldm.
*++uop = new MicroLdrRetUop(machInst, regIdx,
INTREG_UREG0, up, addr);
} else {
*++uop = new MicroLdrUop(machInst, regIdx,
INTREG_UREG0, up, addr);
}
} else {
*++uop = new MicroStrUop(machInst, regIdx, INTREG_UREG0, up, addr);
}
if (up)
addr += 4;
else
addr -= 4;
}
if (!load && writeback) {
*++uop = wbUop;
}
(*uop)->setLastMicroop();
}
MacroVFPMemOp::MacroVFPMemOp(const char *mnem, ExtMachInst machInst,
OpClass __opClass, IntRegIndex rn,
RegIndex vd, bool single, bool up,
bool writeback, bool load, uint32_t offset) :
PredMacroOp(mnem, machInst, __opClass)
{
int i = 0;
// The lowest order bit selects fldmx (set) or fldmd (clear). These seem
// to be functionally identical except that fldmx is deprecated. For now
// we'll assume they're otherwise interchangable.
int count = (single ? offset : (offset / 2));
if (count == 0 || count > NumFloatArchRegs)
warn_once("Bad offset field for VFP load/store multiple.\n");
if (count == 0) {
// Force there to be at least one microop so the macroop makes sense.
writeback = true;
}
if (count > NumFloatArchRegs)
count = NumFloatArchRegs;
numMicroops = count * (single ? 1 : 2) + (writeback ? 1 : 0);
microOps = new StaticInstPtr[numMicroops];
uint32_t addr = 0;
if (!up)
addr = 4 * offset;
bool tempUp = up;
for (int j = 0; j < count; j++) {
if (load) {
microOps[i++] = new MicroLdrFpUop(machInst, vd++, rn,
tempUp, addr);
if (!single)
microOps[i++] = new MicroLdrFpUop(machInst, vd++, rn,
tempUp, addr + 4);
} else {
microOps[i++] = new MicroStrFpUop(machInst, vd++, rn,
tempUp, addr);
if (!single)
microOps[i++] = new MicroStrFpUop(machInst, vd++, rn,
tempUp, addr + 4);
}
if (!tempUp) {
addr -= (single ? 4 : 8);
// The microops don't handle negative displacement, so turn if we
// hit zero, flip polarity and start adding.
if (addr == 0) {
tempUp = true;
}
} else {
addr += (single ? 4 : 8);
}
}
if (writeback) {
if (up) {
microOps[i++] =
new MicroAddiUop(machInst, rn, rn, 4 * offset);
} else {
microOps[i++] =
new MicroSubiUop(machInst, rn, rn, 4 * offset);
}
}
assert(numMicroops == i);
microOps[numMicroops - 1]->setLastMicroop();
}
}
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