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/*
* Copyright (c) 2007 The Hewlett-Packard Development Company
* 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.
*
* 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: Gabe Black
*/
#ifndef __ARCH_X86_UTILITY_HH__
#define __ARCH_X86_UTILITY_HH__
#include "arch/x86/regs/misc.hh"
#include "arch/x86/types.hh"
#include "base/misc.hh"
#include "base/types.hh"
#include "cpu/static_inst.hh"
#include "cpu/thread_context.hh"
#include "sim/full_system.hh"
class ThreadContext;
namespace X86ISA
{
inline PCState
buildRetPC(const PCState &curPC, const PCState &callPC)
{
PCState retPC = callPC;
retPC.uEnd();
return retPC;
}
uint64_t
getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp);
static inline bool
inUserMode(ThreadContext *tc)
{
if (!FullSystem) {
return true;
} else {
HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
return m5reg.cpl == 3;
}
}
/**
* Function to insure ISA semantics about 0 registers.
* @param tc The thread context.
*/
template <class TC>
void zeroRegisters(TC *tc);
void initCPU(ThreadContext *tc, int cpuId);
void startupCPU(ThreadContext *tc, int cpuId);
void copyRegs(ThreadContext *src, ThreadContext *dest);
void copyMiscRegs(ThreadContext *src, ThreadContext *dest);
void skipFunction(ThreadContext *tc);
inline void
advancePC(PCState &pc, const StaticInstPtr &inst)
{
inst->advancePC(pc);
}
inline uint64_t
getExecutingAsid(ThreadContext *tc)
{
return 0;
}
/**
* Reconstruct the rflags register from the internal gem5 register
* state.
*
* gem5 stores rflags in several different registers to avoid
* pipeline dependencies. In order to get the true rflags value,
* we can't simply read the value of MISCREG_RFLAGS. Instead, we
* need to read out various state from microcode registers and
* merge that with MISCREG_RFLAGS.
*
* @param tc Thread context to read rflags from.
* @return rflags as seen by the guest.
*/
uint64_t getRFlags(ThreadContext *tc);
/**
* Set update the rflags register and internal gem5 state.
*
* @note This function does not update MISCREG_M5_REG. You might
* need to update this register by writing anything to
* MISCREG_M5_REG with side-effects.
*
* @see X86ISA::getRFlags()
*
* @param tc Thread context to update
* @param val New rflags value to store in TC
*/
void setRFlags(ThreadContext *tc, uint64_t val);
/**
* Extract the bit string representing a double value.
*/
inline uint64_t getDoubleBits(double val) {
return *(uint64_t *)(&val);
}
/**
* Convert an x87 tag word to abridged tag format.
*
* Convert from the x87 tag representation to the tag abridged
* representation used in the FXSAVE area. The classic format uses
* 2 bits per stack position to indicate if a position is valid,
* zero, special, or empty. The abridged format only stores
* whether a position is empty or not.
*
* @param ftw Tag word in classic x87 format.
* @return Tag word in the abridged format.
*/
uint8_t convX87TagsToXTags(uint16_t ftw);
/**
* Convert an x87 xtag word to normal tags format.
*
* Convert from the abridged x87 tag representation used in the
* FXSAVE area to a full x87 tag. The classic format uses 2 bits
* per stack position to indicate if a position is valid, zero,
* special, or empty. The abridged format only stores whether a
* position is empty or not.
*
* @todo Reconstruct the correct state of stack positions instead
* of just valid/invalid.
*
* @param ftwx Tag word in the abridged format.
* @return Tag word in classic x87 format.
*/
uint16_t convX87XTagsToTags(uint8_t ftwx);
/**
* Generate and updated x87 tag register after a push/pop
* operation.
*
* @note There is currently no support for setting other tags than
* valid and invalid. A real x87 will set the tag value to zero or
* special for some special floating point values.
*
* @param ftw Current value of the FTW register.
* @param top Current x87 TOP value.
* @param spm Stack displacement.
* @return New value of the FTW register.
*/
uint16_t genX87Tags(uint16_t ftw, uint8_t top, int8_t spm);
/**
* Load an 80-bit float from memory and convert it to double.
*
* @param mem Pointer to an 80-bit float.
* @return double representation of the 80-bit float.
*/
double loadFloat80(const void *mem);
/**
* Convert and store a double as an 80-bit float.
*
* @param mem Pointer to destination for the 80-bit float.
* @param value Double precision float to store.
*/
void storeFloat80(void *mem, double value);
}
#endif // __ARCH_X86_UTILITY_HH__
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