diff options
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/predecoder.cc | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/src/arch/x86/predecoder.cc b/src/arch/x86/predecoder.cc index 407a09ec0..1d415ffea 100644 --- a/src/arch/x86/predecoder.cc +++ b/src/arch/x86/predecoder.cc @@ -1,5 +1,5 @@ /* - * Copyright (c) 2007 The Hewlett-Packard Development Company + * Copyright (c) 2007-2008 The Hewlett-Packard Development Company * All rights reserved. * * Redistribution and use of this software in source and binary forms, @@ -55,9 +55,11 @@ * Authors: Gabe Black */ +#include "arch/x86/miscregs.hh" #include "arch/x86/predecoder.hh" #include "base/misc.hh" #include "base/trace.hh" +#include "cpu/thread_context.hh" #include "sim/host.hh" namespace X86ISA @@ -78,7 +80,9 @@ namespace X86ISA emi.modRM = 0; emi.sib = 0; - emi.mode = 0; + HandyM5Reg m5reg = tc->readMiscRegNoEffect(MISCREG_M5_REG); + emi.mode.mode = m5reg.mode; + emi.mode.submode = m5reg.submode; } void Predecoder::process() @@ -209,10 +213,12 @@ namespace X86ISA DPRINTF(Predecoder, "Found opcode %#x.\n", nextByte); emi.opcode.op = nextByte; + SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR); + //Figure out the effective operand size. This can be overriden to //a fixed value at the decoder level. int logOpSize; - if(/*FIXME long mode*/1) + if (emi.mode.submode == SixtyFourBitMode) { if(emi.rex.w) logOpSize = 3; // 64 bit operand size @@ -221,7 +227,7 @@ namespace X86ISA else logOpSize = 2; // 32 bit operand size } - else if(/*FIXME default 32*/1) + else if(csAttr.defaultSize) { if(emi.legacy.op) logOpSize = 1; // 16 bit operand size @@ -242,14 +248,14 @@ namespace X86ISA //Figure out the effective address size. This can be overriden to //a fixed value at the decoder level. int logAddrSize; - if(/*FIXME 64-bit mode*/1) + if(emi.mode.submode == SixtyFourBitMode) { if(emi.legacy.addr) logAddrSize = 2; // 32 bit address size else logAddrSize = 3; // 64 bit address size } - else if(/*FIXME default 32*/1) + else if(csAttr.defaultSize) { if(emi.legacy.addr) logAddrSize = 1; // 16 bit address size @@ -264,6 +270,16 @@ namespace X86ISA logAddrSize = 1; // 16 bit address size } + SegAttr ssAttr = tc->readMiscRegNoEffect(MISCREG_SS_ATTR); + //Figure out the effective stack width. This can be overriden to + //a fixed value at the decoder level. + if(emi.mode.submode == SixtyFourBitMode) + emi.stackSize = 8; // 64 bit stack width + else if(ssAttr.defaultSize) + emi.stackSize = 4; // 32 bit stack width + else + emi.stackSize = 2; // 16 bit stack width + //Set the actual address size emi.addrSize = 1 << logAddrSize; @@ -299,7 +315,9 @@ namespace X86ISA ModRM modRM; modRM = nextByte; DPRINTF(Predecoder, "Found modrm byte %#x.\n", nextByte); - if (0) {//FIXME in 16 bit mode + SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR); + if (emi.mode.submode != SixtyFourBitMode && + !csAttr.defaultSize) { //figure out 16 bit displacement size if(modRM.mod == 0 && modRM.rm == 6 || modRM.mod == 2) displacementSize = 2; |