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+/*
+ * Copyright (c) 2009 The Regents of The University of Michigan
+ * 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: Gabe Black
+ */
+
+#include "arch/x86/floatregs.hh"
+#include "arch/x86/isa.hh"
+#include "arch/x86/tlb.hh"
+#include "cpu/base.hh"
+#include "cpu/thread_context.hh"
+#include "sim/serialize.hh"
+
+namespace X86ISA
+{
+
+void
+ISA::updateHandyM5Reg(Efer efer, CR0 cr0,
+ SegAttr csAttr, SegAttr ssAttr, RFLAGS rflags)
+{
+ HandyM5Reg m5reg;
+ if (efer.lma) {
+ m5reg.mode = LongMode;
+ if (csAttr.longMode)
+ m5reg.submode = SixtyFourBitMode;
+ else
+ m5reg.submode = CompatabilityMode;
+ } else {
+ m5reg.mode = LegacyMode;
+ if (cr0.pe) {
+ if (rflags.vm)
+ m5reg.submode = Virtual8086Mode;
+ else
+ m5reg.submode = ProtectedMode;
+ } else {
+ m5reg.submode = RealMode;
+ }
+ }
+ m5reg.cpl = csAttr.dpl;
+ m5reg.paging = cr0.pg;
+ m5reg.prot = cr0.pe;
+
+ // Compute the default and alternate operand size.
+ if (m5reg.submode == SixtyFourBitMode || csAttr.defaultSize) {
+ m5reg.defOp = 2;
+ m5reg.altOp = 1;
+ } else {
+ m5reg.defOp = 1;
+ m5reg.altOp = 2;
+ }
+
+ // Compute the default and alternate address size.
+ if (m5reg.submode == SixtyFourBitMode) {
+ m5reg.defAddr = 3;
+ m5reg.altAddr = 2;
+ } else if (csAttr.defaultSize) {
+ m5reg.defAddr = 2;
+ m5reg.altAddr = 1;
+ } else {
+ m5reg.defAddr = 1;
+ m5reg.altAddr = 2;
+ }
+
+ // Compute the stack size
+ if (m5reg.submode == SixtyFourBitMode) {
+ m5reg.stack = 3;
+ } else if (ssAttr.defaultSize) {
+ m5reg.stack = 2;
+ } else {
+ m5reg.stack = 1;
+ }
+
+ regVal[MISCREG_M5_REG] = m5reg;
+}
+
+void
+ISA::clear()
+{
+ // Blank everything. 0 might not be an appropriate value for some things,
+ // but it is for most.
+ memset(regVal, 0, NumMiscRegs * sizeof(MiscReg));
+ regVal[MISCREG_DR6] = (mask(8) << 4) | (mask(16) << 16);
+ regVal[MISCREG_DR7] = 1 << 10;
+}
+
+MiscReg
+ISA::readMiscRegNoEffect(int miscReg)
+{
+ // Make sure we're not dealing with an illegal control register.
+ // Instructions should filter out these indexes, and nothing else should
+ // attempt to read them directly.
+ assert( miscReg != MISCREG_CR1 &&
+ !(miscReg > MISCREG_CR4 &&
+ miscReg < MISCREG_CR8) &&
+ !(miscReg > MISCREG_CR8 &&
+ miscReg <= MISCREG_CR15));
+
+ return regVal[miscReg];
+}
+
+MiscReg
+ISA::readMiscReg(int miscReg, ThreadContext * tc)
+{
+ if (miscReg == MISCREG_TSC) {
+ return regVal[MISCREG_TSC] + tc->getCpuPtr()->curCycle();
+ }
+ return readMiscRegNoEffect(miscReg);
+}
+
+void
+ISA::setMiscRegNoEffect(int miscReg, MiscReg val)
+{
+ // Make sure we're not dealing with an illegal control register.
+ // Instructions should filter out these indexes, and nothing else should
+ // attempt to write to them directly.
+ assert( miscReg != MISCREG_CR1 &&
+ !(miscReg > MISCREG_CR4 &&
+ miscReg < MISCREG_CR8) &&
+ !(miscReg > MISCREG_CR8 &&
+ miscReg <= MISCREG_CR15));
+ regVal[miscReg] = val;
+}
+
+void
+ISA::setMiscReg(int miscReg, MiscReg val, ThreadContext * tc)
+{
+ MiscReg newVal = val;
+ switch(miscReg)
+ {
+ case MISCREG_CR0:
+ {
+ CR0 toggled = regVal[miscReg] ^ val;
+ CR0 newCR0 = val;
+ Efer efer = regVal[MISCREG_EFER];
+ if (toggled.pg && efer.lme) {
+ if (newCR0.pg) {
+ //Turning on long mode
+ efer.lma = 1;
+ regVal[MISCREG_EFER] = efer;
+ } else {
+ //Turning off long mode
+ efer.lma = 0;
+ regVal[MISCREG_EFER] = efer;
+ }
+ }
+ if (toggled.pg) {
+ tc->getITBPtr()->invalidateAll();
+ tc->getDTBPtr()->invalidateAll();
+ }
+ //This must always be 1.
+ newCR0.et = 1;
+ newVal = newCR0;
+ updateHandyM5Reg(regVal[MISCREG_EFER],
+ newCR0,
+ regVal[MISCREG_CS_ATTR],
+ regVal[MISCREG_SS_ATTR],
+ regVal[MISCREG_RFLAGS]);
+ }
+ break;
+ case MISCREG_CR2:
+ break;
+ case MISCREG_CR3:
+ tc->getITBPtr()->invalidateNonGlobal();
+ tc->getDTBPtr()->invalidateNonGlobal();
+ break;
+ case MISCREG_CR4:
+ {
+ CR4 toggled = regVal[miscReg] ^ val;
+ if (toggled.pae || toggled.pse || toggled.pge) {
+ tc->getITBPtr()->invalidateAll();
+ tc->getDTBPtr()->invalidateAll();
+ }
+ }
+ break;
+ case MISCREG_CR8:
+ break;
+ case MISCREG_CS_ATTR:
+ {
+ SegAttr toggled = regVal[miscReg] ^ val;
+ SegAttr newCSAttr = val;
+ if (toggled.longMode) {
+ if (newCSAttr.longMode) {
+ regVal[MISCREG_ES_EFF_BASE] = 0;
+ regVal[MISCREG_CS_EFF_BASE] = 0;
+ regVal[MISCREG_SS_EFF_BASE] = 0;
+ regVal[MISCREG_DS_EFF_BASE] = 0;
+ } else {
+ regVal[MISCREG_ES_EFF_BASE] = regVal[MISCREG_ES_BASE];
+ regVal[MISCREG_CS_EFF_BASE] = regVal[MISCREG_CS_BASE];
+ regVal[MISCREG_SS_EFF_BASE] = regVal[MISCREG_SS_BASE];
+ regVal[MISCREG_DS_EFF_BASE] = regVal[MISCREG_DS_BASE];
+ }
+ }
+ updateHandyM5Reg(regVal[MISCREG_EFER],
+ regVal[MISCREG_CR0],
+ newCSAttr,
+ regVal[MISCREG_SS_ATTR],
+ regVal[MISCREG_RFLAGS]);
+ }
+ break;
+ case MISCREG_SS_ATTR:
+ updateHandyM5Reg(regVal[MISCREG_EFER],
+ regVal[MISCREG_CR0],
+ regVal[MISCREG_CS_ATTR],
+ val,
+ regVal[MISCREG_RFLAGS]);
+ break;
+ // These segments always actually use their bases, or in other words
+ // their effective bases must stay equal to their actual bases.
+ case MISCREG_FS_BASE:
+ case MISCREG_GS_BASE:
+ case MISCREG_HS_BASE:
+ case MISCREG_TSL_BASE:
+ case MISCREG_TSG_BASE:
+ case MISCREG_TR_BASE:
+ case MISCREG_IDTR_BASE:
+ regVal[MISCREG_SEG_EFF_BASE(miscReg - MISCREG_SEG_BASE_BASE)] = val;
+ break;
+ // These segments ignore their bases in 64 bit mode.
+ // their effective bases must stay equal to their actual bases.
+ case MISCREG_ES_BASE:
+ case MISCREG_CS_BASE:
+ case MISCREG_SS_BASE:
+ case MISCREG_DS_BASE:
+ {
+ Efer efer = regVal[MISCREG_EFER];
+ SegAttr csAttr = regVal[MISCREG_CS_ATTR];
+ if (!efer.lma || !csAttr.longMode) // Check for non 64 bit mode.
+ regVal[MISCREG_SEG_EFF_BASE(miscReg -
+ MISCREG_SEG_BASE_BASE)] = val;
+ }
+ break;
+ case MISCREG_TSC:
+ regVal[MISCREG_TSC] = val - tc->getCpuPtr()->curCycle();
+ return;
+ case MISCREG_DR0:
+ case MISCREG_DR1:
+ case MISCREG_DR2:
+ case MISCREG_DR3:
+ /* These should eventually set up breakpoints. */
+ break;
+ case MISCREG_DR4:
+ miscReg = MISCREG_DR6;
+ /* Fall through to have the same effects as DR6. */
+ case MISCREG_DR6:
+ {
+ DR6 dr6 = regVal[MISCREG_DR6];
+ DR6 newDR6 = val;
+ dr6.b0 = newDR6.b0;
+ dr6.b1 = newDR6.b1;
+ dr6.b2 = newDR6.b2;
+ dr6.b3 = newDR6.b3;
+ dr6.bd = newDR6.bd;
+ dr6.bs = newDR6.bs;
+ dr6.bt = newDR6.bt;
+ newVal = dr6;
+ }
+ break;
+ case MISCREG_DR5:
+ miscReg = MISCREG_DR7;
+ /* Fall through to have the same effects as DR7. */
+ case MISCREG_DR7:
+ {
+ DR7 dr7 = regVal[MISCREG_DR7];
+ DR7 newDR7 = val;
+ dr7.l0 = newDR7.l0;
+ dr7.g0 = newDR7.g0;
+ if (dr7.l0 || dr7.g0) {
+ panic("Debug register breakpoints not implemented.\n");
+ } else {
+ /* Disable breakpoint 0. */
+ }
+ dr7.l1 = newDR7.l1;
+ dr7.g1 = newDR7.g1;
+ if (dr7.l1 || dr7.g1) {
+ panic("Debug register breakpoints not implemented.\n");
+ } else {
+ /* Disable breakpoint 1. */
+ }
+ dr7.l2 = newDR7.l2;
+ dr7.g2 = newDR7.g2;
+ if (dr7.l2 || dr7.g2) {
+ panic("Debug register breakpoints not implemented.\n");
+ } else {
+ /* Disable breakpoint 2. */
+ }
+ dr7.l3 = newDR7.l3;
+ dr7.g3 = newDR7.g3;
+ if (dr7.l3 || dr7.g3) {
+ panic("Debug register breakpoints not implemented.\n");
+ } else {
+ /* Disable breakpoint 3. */
+ }
+ dr7.gd = newDR7.gd;
+ dr7.rw0 = newDR7.rw0;
+ dr7.len0 = newDR7.len0;
+ dr7.rw1 = newDR7.rw1;
+ dr7.len1 = newDR7.len1;
+ dr7.rw2 = newDR7.rw2;
+ dr7.len2 = newDR7.len2;
+ dr7.rw3 = newDR7.rw3;
+ dr7.len3 = newDR7.len3;
+ }
+ break;
+ case MISCREG_M5_REG:
+ // Writing anything to the m5reg with side effects makes it update
+ // based on the current values of the relevant registers. The actual
+ // value written is discarded.
+ updateHandyM5Reg(regVal[MISCREG_EFER],
+ regVal[MISCREG_CR0],
+ regVal[MISCREG_CS_ATTR],
+ regVal[MISCREG_SS_ATTR],
+ regVal[MISCREG_RFLAGS]);
+ return;
+ default:
+ break;
+ }
+ setMiscRegNoEffect(miscReg, newVal);
+}
+
+void
+ISA::serialize(EventManager *em, std::ostream & os)
+{
+ SERIALIZE_ARRAY(regVal, NumMiscRegs);
+}
+
+void
+ISA::unserialize(EventManager *em, Checkpoint * cp,
+ const std::string & section)
+{
+ UNSERIALIZE_ARRAY(regVal, NumMiscRegs);
+}
+
+int
+ISA::flattenIntIndex(int reg)
+{
+ //If we need to fold over the index to match byte semantics, do that.
+ //Otherwise, just strip off any extra bits and pass it through.
+ if (reg & (1 << 6))
+ return (reg & (~(1 << 6) - 0x4));
+ else
+ return (reg & ~(1 << 6));
+}
+
+int
+ISA::flattenFloatIndex(int reg)
+{
+ if (reg >= NUM_FLOATREGS) {
+ int top = readMiscRegNoEffect(MISCREG_X87_TOP);
+ reg = FLOATREG_STACK(reg - NUM_FLOATREGS, top);
+ }
+ return reg;
+}
+
+}
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