From dc53ca89f685155ff00103ed013b1ed6a6ad91a6 Mon Sep 17 00:00:00 2001 From: Gabe Black Date: Wed, 25 Feb 2009 10:18:22 -0800 Subject: [PATCH] X86: Add a flag to force memory accesses to happen at CPL 0. --- src/arch/x86/insts/microldstop.hh | 12 +++- src/arch/x86/isa/includes.isa | 1 + src/arch/x86/isa/microops/ldstop.isa | 86 ++++++++++++++++------------ src/arch/x86/tlb.cc | 3 +- 4 files changed, 64 insertions(+), 38 deletions(-) diff --git a/src/arch/x86/insts/microldstop.hh b/src/arch/x86/insts/microldstop.hh index eccd37dc2..f0051e2cf 100644 --- a/src/arch/x86/insts/microldstop.hh +++ b/src/arch/x86/insts/microldstop.hh @@ -60,9 +60,16 @@ #include "arch/x86/insts/microop.hh" #include "mem/packet.hh" +#include "mem/request.hh" namespace X86ISA { + static const Request::FlagsType SegmentFlagMask = mask(4); + static const int FlagShift = 4; + enum FlagBit { + CPL0FlagBit = 1 + }; + /** * Base class for load and store ops */ @@ -77,6 +84,7 @@ namespace X86ISA const RegIndex data; const uint8_t dataSize; const uint8_t addressSize; + const Request::FlagsType memFlags; RegIndex foldOBit, foldABit; //Constructor @@ -87,13 +95,15 @@ namespace X86ISA uint64_t _disp, uint8_t _segment, RegIndex _data, uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags, OpClass __opClass) : X86MicroopBase(machInst, mnem, _instMnem, isMicro, isDelayed, isFirst, isLast, __opClass), scale(_scale), index(_index), base(_base), disp(_disp), segment(_segment), data(_data), - dataSize(_dataSize), addressSize(_addressSize) + dataSize(_dataSize), addressSize(_addressSize), + memFlags(_memFlags | _segment) { foldOBit = (dataSize == 1 && !_machInst.rex.present) ? 1 << 6 : 0; foldABit = diff --git a/src/arch/x86/isa/includes.isa b/src/arch/x86/isa/includes.isa index 909f2f389..10bac86ed 100644 --- a/src/arch/x86/isa/includes.isa +++ b/src/arch/x86/isa/includes.isa @@ -117,6 +117,7 @@ output decoder {{ #include "arch/x86/microcode_rom.hh" #include "arch/x86/miscregs.hh" #include "arch/x86/segmentregs.hh" +#include "arch/x86/tlb.hh" #include "base/cprintf.hh" #include "base/loader/symtab.hh" #include "base/misc.hh" diff --git a/src/arch/x86/isa/microops/ldstop.isa b/src/arch/x86/isa/microops/ldstop.isa index 5697f781b..097b0e311 100644 --- a/src/arch/x86/isa/microops/ldstop.isa +++ b/src/arch/x86/isa/microops/ldstop.isa @@ -124,14 +124,16 @@ def template MicroLeaDeclare {{ uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize); + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags); %(class_name)s(ExtMachInst _machInst, const char * instMnem, uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize); + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags); %(BasicExecDeclare)s }; @@ -151,7 +153,7 @@ def template MicroLoadExecute {{ %(ea_code)s; DPRINTF(X86, "%s : %s: The address is %#x\n", instMnem, mnemonic, EA); - fault = read(xc, EA, Mem, (%(mem_flags)s) | segment); + fault = read(xc, EA, Mem, memFlags); if(fault == NoFault) { @@ -178,7 +180,7 @@ def template MicroLoadInitiateAcc {{ %(ea_code)s; DPRINTF(X86, "%s : %s: The address is %#x\n", instMnem, mnemonic, EA); - fault = read(xc, EA, Mem, (%(mem_flags)s) | segment); + fault = read(xc, EA, Mem, memFlags); return fault; } @@ -225,7 +227,7 @@ def template MicroStoreExecute {{ if(fault == NoFault) { - fault = write(xc, Mem, EA, (%(mem_flags)s) | segment); + fault = write(xc, Mem, EA, memFlags); if(fault == NoFault) { %(post_code)s; @@ -253,7 +255,7 @@ def template MicroStoreInitiateAcc {{ if(fault == NoFault) { - write(xc, Mem, EA, (%(mem_flags)s) | segment); + write(xc, Mem, EA, memFlags); } return fault; } @@ -296,14 +298,16 @@ def template MicroLdStOpDeclare {{ uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize); + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags); %(class_name)s(ExtMachInst _machInst, const char * instMnem, uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize); + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags); %(BasicExecDeclare)s @@ -325,12 +329,13 @@ def template MicroLdStOpConstructor {{ uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize) : + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags) : %(base_class)s(machInst, "%(mnemonic)s", instMnem, false, false, false, false, _scale, _index, _base, _disp, _segment, _data, - _dataSize, _addressSize, %(op_class)s) + _dataSize, _addressSize, _memFlags, %(op_class)s) { buildMe(); } @@ -341,12 +346,13 @@ def template MicroLdStOpConstructor {{ uint8_t _scale, RegIndex _index, RegIndex _base, uint64_t _disp, uint8_t _segment, RegIndex _data, - uint8_t _dataSize, uint8_t _addressSize) : + uint8_t _dataSize, uint8_t _addressSize, + Request::FlagsType _memFlags) : %(base_class)s(machInst, "%(mnemonic)s", instMnem, isMicro, isDelayed, isFirst, isLast, _scale, _index, _base, _disp, _segment, _data, - _dataSize, _addressSize, %(op_class)s) + _dataSize, _addressSize, _memFlags, %(op_class)s) { buildMe(); } @@ -354,26 +360,31 @@ def template MicroLdStOpConstructor {{ let {{ class LdStOp(X86Microop): - def __init__(self, data, segment, addr, disp, dataSize, addressSize): + def __init__(self, data, segment, addr, disp, + dataSize, addressSize, baseFlags, atCPL0): self.data = data [self.scale, self.index, self.base] = addr self.disp = disp self.segment = segment self.dataSize = dataSize self.addressSize = addressSize + self.memFlags = baseFlags + if atCPL0: + self.memFlags += " | (CPL0FlagBit << FlagShift)" def getAllocator(self, *microFlags): allocator = '''new %(class_name)s(machInst, macrocodeBlock %(flags)s, %(scale)s, %(index)s, %(base)s, %(disp)s, %(segment)s, %(data)s, - %(dataSize)s, %(addressSize)s)''' % { + %(dataSize)s, %(addressSize)s, %(memFlags)s)''' % { "class_name" : self.className, "flags" : self.microFlagsText(microFlags), "scale" : self.scale, "index" : self.index, "base" : self.base, "disp" : self.disp, "segment" : self.segment, "data" : self.data, - "dataSize" : self.dataSize, "addressSize" : self.addressSize} + "dataSize" : self.dataSize, "addressSize" : self.addressSize, + "memFlags" : self.memFlags} return allocator }}; @@ -387,7 +398,7 @@ let {{ calculateEA = "EA = SegBase + scale * Index + Base + disp;" - def defineMicroLoadOp(mnemonic, code, mem_flags=0): + def defineMicroLoadOp(mnemonic, code, mem_flags="0"): global header_output global decoder_output global exec_output @@ -398,8 +409,7 @@ let {{ # Build up the all register version of this micro op iop = InstObjParams(name, Name, 'X86ISA::LdStOp', {"code": code, - "ea_code": calculateEA, - "mem_flags": mem_flags}) + "ea_code": calculateEA}) header_output += MicroLdStOpDeclare.subst(iop) decoder_output += MicroLdStOpConstructor.subst(iop) exec_output += MicroLoadExecute.subst(iop) @@ -408,16 +418,19 @@ let {{ class LoadOp(LdStOp): def __init__(self, data, segment, addr, disp = 0, - dataSize="env.dataSize", addressSize="env.addressSize"): - super(LoadOp, self).__init__(data, segment, - addr, disp, dataSize, addressSize) + dataSize="env.dataSize", + addressSize="env.addressSize", + atCPL0=False): + super(LoadOp, self).__init__(data, segment, addr, + disp, dataSize, addressSize, mem_flags, atCPL0) self.className = Name self.mnemonic = name microopClasses[name] = LoadOp defineMicroLoadOp('Ld', 'Data = merge(Data, Mem, dataSize);') - defineMicroLoadOp('Ldst', 'Data = merge(Data, Mem, dataSize);', 'StoreCheck') + defineMicroLoadOp('Ldst', 'Data = merge(Data, Mem, dataSize);', + 'X86ISA::StoreCheck') defineMicroLoadOp('Ldfp', 'FpData.uqw = Mem;') def defineMicroStoreOp(mnemonic, code, \ @@ -434,8 +447,7 @@ let {{ {"code": code, "post_code": postCode, "complete_code": completeCode, - "ea_code": calculateEA, - "mem_flags": mem_flags}) + "ea_code": calculateEA}) header_output += MicroLdStOpDeclare.subst(iop) decoder_output += MicroLdStOpConstructor.subst(iop) exec_output += MicroStoreExecute.subst(iop) @@ -444,9 +456,11 @@ let {{ class StoreOp(LdStOp): def __init__(self, data, segment, addr, disp = 0, - dataSize="env.dataSize", addressSize="env.addressSize"): - super(StoreOp, self).__init__(data, segment, - addr, disp, dataSize, addressSize) + dataSize="env.dataSize", + addressSize="env.addressSize", + atCPL0=False): + super(StoreOp, self).__init__(data, segment, addr, + disp, dataSize, addressSize, mem_flags, atCPL0) self.className = Name self.mnemonic = name @@ -461,8 +475,7 @@ let {{ iop = InstObjParams("lea", "Lea", 'X86ISA::LdStOp', {"code": "Data = merge(Data, EA, dataSize);", - "ea_code": calculateEA, - "mem_flags": 0}) + "ea_code": calculateEA}) header_output += MicroLeaDeclare.subst(iop) decoder_output += MicroLdStOpConstructor.subst(iop) exec_output += MicroLeaExecute.subst(iop) @@ -471,7 +484,7 @@ let {{ def __init__(self, data, segment, addr, disp = 0, dataSize="env.dataSize", addressSize="env.addressSize"): super(LeaOp, self).__init__(data, segment, - addr, disp, dataSize, addressSize) + addr, disp, dataSize, addressSize, "0", False) self.className = "Lea" self.mnemonic = "lea" @@ -480,17 +493,17 @@ let {{ iop = InstObjParams("tia", "Tia", 'X86ISA::LdStOp', {"code": "xc->demapPage(EA, 0);", - "ea_code": calculateEA, - "mem_flags": 0}) + "ea_code": calculateEA}) header_output += MicroLeaDeclare.subst(iop) decoder_output += MicroLdStOpConstructor.subst(iop) exec_output += MicroLeaExecute.subst(iop) class TiaOp(LdStOp): def __init__(self, segment, addr, disp = 0, - dataSize="env.dataSize", addressSize="env.addressSize"): + dataSize="env.dataSize", + addressSize="env.addressSize"): super(TiaOp, self).__init__("NUM_INTREGS", segment, - addr, disp, dataSize, addressSize) + addr, disp, dataSize, addressSize, "0", False) self.className = "Tia" self.mnemonic = "tia" @@ -498,9 +511,10 @@ let {{ class CdaOp(LdStOp): def __init__(self, segment, addr, disp = 0, - dataSize="env.dataSize", addressSize="env.addressSize"): + dataSize="env.dataSize", + addressSize="env.addressSize", atCPL0=False): super(CdaOp, self).__init__("NUM_INTREGS", segment, - addr, disp, dataSize, addressSize) + addr, disp, dataSize, addressSize, "0", atCPL0) self.className = "Cda" self.mnemonic = "cda" diff --git a/src/arch/x86/tlb.cc b/src/arch/x86/tlb.cc index 3962cd607..372c8b997 100644 --- a/src/arch/x86/tlb.cc +++ b/src/arch/x86/tlb.cc @@ -59,6 +59,7 @@ #include "config/full_system.hh" +#include "arch/x86/insts/microldstop.hh" #include "arch/x86/pagetable.hh" #include "arch/x86/tlb.hh" #include "arch/x86/x86_traits.hh" @@ -195,7 +196,7 @@ TLB::translate(RequestPtr req, ThreadContext *tc, uint32_t flags = req->getFlags(); bool storeCheck = flags & StoreCheck; - int seg = flags & mask(4); + int seg = flags & SegmentFlagMask; //XXX Junk code to surpress the warning if (storeCheck); -- 2.30.2