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authorAli Saidi <Ali.Saidi@ARM.com>2011-04-04 11:42:28 -0500
committerAli Saidi <Ali.Saidi@ARM.com>2011-04-04 11:42:28 -0500
commit6b6989049383b67a2daef562a0319421ff1a8067 (patch)
treea5139ef0015d25e2bbf246ddfed1939c35fbf2d0 /src
parentf926fa77112c53ef8444657e89d4f00f559fd61c (diff)
downloadgem5-6b6989049383b67a2daef562a0319421ff1a8067.tar.xz
ARM: Fix checkpoint restoration into O3 CPU and the way O3 switchCpu works.
This change fixes a small bug in the arm copyRegs() code where some registers wouldn't be copied if the processor was in a mode other than MODE_USER. Additionally, this change simplifies the way the O3 switchCpu code works by utilizing TheISA::copyRegs() to copy the required context information rather than the adhoc copying that goes on in the CPU model. The current code makes assumptions about the visibility of int and float registers that aren't true for all architectures in FS mode.
Diffstat (limited to 'src')
-rw-r--r--src/arch/arm/isa.cc9
-rw-r--r--src/arch/arm/miscregs.hh2
-rw-r--r--src/arch/arm/utility.cc13
-rwxr-xr-xsrc/cpu/o3/thread_context_impl.hh33
4 files changed, 27 insertions, 30 deletions
diff --git a/src/arch/arm/isa.cc b/src/arch/arm/isa.cc
index 216ae04e7..9988d431a 100644
--- a/src/arch/arm/isa.cc
+++ b/src/arch/arm/isa.cc
@@ -447,6 +447,7 @@ ISA::setMiscReg(int misc_reg, const MiscReg &val, ThreadContext *tc)
default:
panic("Security Extensions not implemented!");
}
+ warn("Translating via MISCREG in atomic mode! Fix Me!\n");
req->setVirt(0, val, 1, flags, tc->pcState().pc());
fault = tc->getDTBPtr()->translateAtomic(req, tc, mode);
if (fault == NoFault) {
@@ -475,7 +476,13 @@ ISA::setMiscReg(int misc_reg, const MiscReg &val, ThreadContext *tc)
tc->getITBPtr()->invalidateMiscReg();
tc->getDTBPtr()->invalidateMiscReg();
break;
-
+ case MISCREG_CPSR_MODE:
+ // This miscreg is used by copy*Regs to set the CPSR mode
+ // without updating other CPSR variables. It's used to
+ // make sure the register map is in such a state that we can
+ // see all of the registers for the copy.
+ updateRegMap(val);
+ return;
}
}
setMiscRegNoEffect(misc_reg, newVal);
diff --git a/src/arch/arm/miscregs.hh b/src/arch/arm/miscregs.hh
index fc18fa114..2ccd9b4c2 100644
--- a/src/arch/arm/miscregs.hh
+++ b/src/arch/arm/miscregs.hh
@@ -170,6 +170,7 @@ namespace ArmISA
MISCREG_ID_ISAR3,
MISCREG_ID_ISAR4,
MISCREG_ID_ISAR5,
+ MISCREG_CPSR_MODE,
MISCREG_CP15_UNIMP_START,
MISCREG_TCMTR = MISCREG_CP15_UNIMP_START,
MISCREG_ID_PFR1,
@@ -233,6 +234,7 @@ namespace ArmISA
"pmceid1", "pmc_other", "pmxevcntr",
"pmuserenr", "pmintenset", "pmintenclr",
"id_isar0", "id_isar1", "id_isar2", "id_isar3", "id_isar4", "id_isar5",
+ "cpsr_mode",
// Unimplemented below
"tcmtr",
"id_pfr1", "id_dfr0", "id_afr0",
diff --git a/src/arch/arm/utility.cc b/src/arch/arm/utility.cc
index 0d91c9f90..6bca63291 100644
--- a/src/arch/arm/utility.cc
+++ b/src/arch/arm/utility.cc
@@ -124,8 +124,21 @@ void
copyRegs(ThreadContext *src, ThreadContext *dest)
{
int i;
+
+ int saved_mode = ((CPSR)src->readMiscReg(MISCREG_CPSR)).mode;
+
+ // Make sure we're in user mode, so we can easily see all the registers
+ // in the copy loop
+ src->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
+ dest->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
+
for(i = 0; i < TheISA::NumIntRegs; i++)
dest->setIntReg(i, src->readIntReg(i));
+
+ // Restore us back to the old mode
+ src->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
+ dest->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
+
for(i = 0; i < TheISA::NumFloatRegs; i++)
dest->setFloatReg(i, src->readFloatReg(i));
for(i = 0; i < TheISA::NumMiscRegs; i++)
diff --git a/src/cpu/o3/thread_context_impl.hh b/src/cpu/o3/thread_context_impl.hh
index e7b0540d1..b179ad50e 100755
--- a/src/cpu/o3/thread_context_impl.hh
+++ b/src/cpu/o3/thread_context_impl.hh
@@ -231,36 +231,11 @@ template <class Impl>
void
O3ThreadContext<Impl>::copyArchRegs(ThreadContext *tc)
{
- // This function will mess things up unless the ROB is empty and
- // there are no instructions in the pipeline.
- ThreadID tid = thread->threadId();
- PhysRegIndex renamed_reg;
-
- // First loop through the integer registers.
- for (int i = 0; i < TheISA::NumIntRegs; ++i) {
- renamed_reg = cpu->renameMap[tid].lookup(i);
-
- DPRINTF(O3CPU, "Copying over register %i, had data %lli, "
- "now has data %lli.\n",
- renamed_reg, cpu->readIntReg(renamed_reg),
- tc->readIntReg(i));
-
- cpu->setIntReg(renamed_reg, tc->readIntReg(i));
- }
-
- // Then loop through the floating point registers.
- for (int i = 0; i < TheISA::NumFloatRegs; ++i) {
- renamed_reg = cpu->renameMap[tid].lookup(i + TheISA::FP_Base_DepTag);
- cpu->setFloatRegBits(renamed_reg,
- tc->readFloatRegBits(i));
- }
-
- // Copy the misc regs.
- TheISA::copyMiscRegs(tc, this);
+ // Prevent squashing
+ thread->inSyscall = true;
+ TheISA::copyRegs(tc, this);
+ thread->inSyscall = false;
- // Then finally set the PC, the next PC, the nextNPC, the micropc, and the
- // next micropc.
- cpu->pcState(tc->pcState(), tid);
#if !FULL_SYSTEM
this->thread->funcExeInst = tc->readFuncExeInst();
#endif