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gem5 / public / gem5 / b4b024808ec21b006155f04852eb3f93877b2de9 / . / src / arch / arm / faults.cc
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/*
* Copyright (c) 2010, 2012-2014, 2016-2019, 2022 Arm Limited
* 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.
*
* Copyright (c) 2003-2005 The Regents of The University of Michigan
* Copyright (c) 2007-2008 The Florida State University
* 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.
*/
#include "arch/arm/faults.hh"
#include "arch/arm/insts/static_inst.hh"
#include "arch/arm/interrupts.hh"
#include "arch/arm/isa.hh"
#include "arch/arm/self_debug.hh"
#include "arch/arm/system.hh"
#include "arch/arm/utility.hh"
#include "base/compiler.hh"
#include "base/trace.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "debug/Faults.hh"
#include "sim/full_system.hh"
namespace gem5
{
namespace ArmISA
{
const uint32_t HighVecs = 0xFFFF0000;
uint8_t ArmFault::shortDescFaultSources[] = {
0x01, // AlignmentFault
0x04, // InstructionCacheMaintenance
0xff, // SynchExtAbtOnTranslTableWalkL0 (INVALID)
0x0c, // SynchExtAbtOnTranslTableWalkL1
0x0e, // SynchExtAbtOnTranslTableWalkL2
0xff, // SynchExtAbtOnTranslTableWalkL3 (INVALID)
0xff, // SynchPtyErrOnTranslTableWalkL0 (INVALID)
0x1c, // SynchPtyErrOnTranslTableWalkL1
0x1e, // SynchPtyErrOnTranslTableWalkL2
0xff, // SynchPtyErrOnTranslTableWalkL3 (INVALID)
0xff, // TranslationL0 (INVALID)
0x05, // TranslationL1
0x07, // TranslationL2
0xff, // TranslationL3 (INVALID)
0xff, // AccessFlagL0 (INVALID)
0x03, // AccessFlagL1
0x06, // AccessFlagL2
0xff, // AccessFlagL3 (INVALID)
0xff, // DomainL0 (INVALID)
0x09, // DomainL1
0x0b, // DomainL2
0xff, // DomainL3 (INVALID)
0xff, // PermissionL0 (INVALID)
0x0d, // PermissionL1
0x0f, // PermissionL2
0xff, // PermissionL3 (INVALID)
0x02, // DebugEvent
0x08, // SynchronousExternalAbort
0x10, // TLBConflictAbort
0x19, // SynchPtyErrOnMemoryAccess
0x16, // AsynchronousExternalAbort
0x18, // AsynchPtyErrOnMemoryAccess
0xff, // AddressSizeL0 (INVALID)
0xff, // AddressSizeL1 (INVALID)
0xff, // AddressSizeL2 (INVALID)
0xff, // AddressSizeL3 (INVALID)
0x40, // PrefetchTLBMiss
0x80 // PrefetchUncacheable
};
static_assert(sizeof(ArmFault::shortDescFaultSources) ==
ArmFault::NumFaultSources,
"Invalid size of ArmFault::shortDescFaultSources[]");
uint8_t ArmFault::longDescFaultSources[] = {
0x21, // AlignmentFault
0xff, // InstructionCacheMaintenance (INVALID)
0xff, // SynchExtAbtOnTranslTableWalkL0 (INVALID)
0x15, // SynchExtAbtOnTranslTableWalkL1
0x16, // SynchExtAbtOnTranslTableWalkL2
0x17, // SynchExtAbtOnTranslTableWalkL3
0xff, // SynchPtyErrOnTranslTableWalkL0 (INVALID)
0x1d, // SynchPtyErrOnTranslTableWalkL1
0x1e, // SynchPtyErrOnTranslTableWalkL2
0x1f, // SynchPtyErrOnTranslTableWalkL3
0xff, // TranslationL0 (INVALID)
0x05, // TranslationL1
0x06, // TranslationL2
0x07, // TranslationL3
0xff, // AccessFlagL0 (INVALID)
0x09, // AccessFlagL1
0x0a, // AccessFlagL2
0x0b, // AccessFlagL3
0xff, // DomainL0 (INVALID)
0x3d, // DomainL1
0x3e, // DomainL2
0xff, // DomainL3 (RESERVED)
0xff, // PermissionL0 (INVALID)
0x0d, // PermissionL1
0x0e, // PermissionL2
0x0f, // PermissionL3
0x22, // DebugEvent
0x10, // SynchronousExternalAbort
0x30, // TLBConflictAbort
0x18, // SynchPtyErrOnMemoryAccess
0x11, // AsynchronousExternalAbort
0x19, // AsynchPtyErrOnMemoryAccess
0xff, // AddressSizeL0 (INVALID)
0xff, // AddressSizeL1 (INVALID)
0xff, // AddressSizeL2 (INVALID)
0xff, // AddressSizeL3 (INVALID)
0x40, // PrefetchTLBMiss
0x80 // PrefetchUncacheable
};
static_assert(sizeof(ArmFault::longDescFaultSources) ==
ArmFault::NumFaultSources,
"Invalid size of ArmFault::longDescFaultSources[]");
uint8_t ArmFault::aarch64FaultSources[] = {
0x21, // AlignmentFault
0xff, // InstructionCacheMaintenance (INVALID)
0x14, // SynchExtAbtOnTranslTableWalkL0
0x15, // SynchExtAbtOnTranslTableWalkL1
0x16, // SynchExtAbtOnTranslTableWalkL2
0x17, // SynchExtAbtOnTranslTableWalkL3
0x1c, // SynchPtyErrOnTranslTableWalkL0
0x1d, // SynchPtyErrOnTranslTableWalkL1
0x1e, // SynchPtyErrOnTranslTableWalkL2
0x1f, // SynchPtyErrOnTranslTableWalkL3
0x04, // TranslationL0
0x05, // TranslationL1
0x06, // TranslationL2
0x07, // TranslationL3
0x08, // AccessFlagL0
0x09, // AccessFlagL1
0x0a, // AccessFlagL2
0x0b, // AccessFlagL3
// @todo: Section & Page Domain Fault in AArch64?
0xff, // DomainL0 (INVALID)
0xff, // DomainL1 (INVALID)
0xff, // DomainL2 (INVALID)
0xff, // DomainL3 (INVALID)
0x0c, // PermissionL0
0x0d, // PermissionL1
0x0e, // PermissionL2
0x0f, // PermissionL3
0x22, // DebugEvent
0x10, // SynchronousExternalAbort
0x30, // TLBConflictAbort
0x18, // SynchPtyErrOnMemoryAccess
0xff, // AsynchronousExternalAbort (INVALID)
0xff, // AsynchPtyErrOnMemoryAccess (INVALID)
0x00, // AddressSizeL0
0x01, // AddressSizeL1
0x02, // AddressSizeL2
0x03, // AddressSizeL3
0x40, // PrefetchTLBMiss
0x80 // PrefetchUncacheable
};
static_assert(sizeof(ArmFault::aarch64FaultSources) ==
ArmFault::NumFaultSources,
"Invalid size of ArmFault::aarch64FaultSources[]");
// Fields: name, offset, cur{ELT,ELH}Offset, lowerEL{64,32}Offset, next mode,
// {ARM, Thumb, ARM_ELR, Thumb_ELR} PC offset, hyp trap,
// {A, F} disable, class, stat
template<> ArmFault::FaultVals ArmFaultVals<Reset>::vals(
// Some dummy values (the reset vector has an IMPLEMENTATION DEFINED
// location in AArch64)
"Reset", 0x000, 0x000, 0x000, 0x000, 0x000, MODE_SVC,
0, 0, 0, 0, false, true, true, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<UndefinedInstruction>::vals(
"Undefined Instruction", 0x004, 0x000, 0x200, 0x400, 0x600, MODE_UNDEFINED,
4, 2, 0, 0, true, false, false, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<SupervisorCall>::vals(
"Supervisor Call", 0x008, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
4, 2, 4, 2, true, false, false, ExceptionClass::SVC_TO_HYP
);
template<> ArmFault::FaultVals ArmFaultVals<SecureMonitorCall>::vals(
"Secure Monitor Call", 0x008, 0x000, 0x200, 0x400, 0x600, MODE_MON,
4, 4, 4, 4, false, true, true, ExceptionClass::SMC_TO_HYP
);
template<> ArmFault::FaultVals ArmFaultVals<HypervisorCall>::vals(
"Hypervisor Call", 0x008, 0x000, 0x200, 0x400, 0x600, MODE_HYP,
4, 4, 4, 4, true, false, false, ExceptionClass::HVC
);
template<> ArmFault::FaultVals ArmFaultVals<PrefetchAbort>::vals(
"Prefetch Abort", 0x00C, 0x000, 0x200, 0x400, 0x600, MODE_ABORT,
4, 4, 0, 0, true, true, false, ExceptionClass::PREFETCH_ABORT_TO_HYP
);
template<> ArmFault::FaultVals ArmFaultVals<DataAbort>::vals(
"Data Abort", 0x010, 0x000, 0x200, 0x400, 0x600, MODE_ABORT,
8, 8, 0, 0, true, true, false, ExceptionClass::DATA_ABORT_TO_HYP
);
template<> ArmFault::FaultVals ArmFaultVals<VirtualDataAbort>::vals(
"Virtual Data Abort", 0x010, 0x000, 0x200, 0x400, 0x600, MODE_ABORT,
8, 8, 0, 0, true, true, false, ExceptionClass::INVALID
);
template<> ArmFault::FaultVals ArmFaultVals<HypervisorTrap>::vals(
// @todo: double check these values
"Hypervisor Trap", 0x014, 0x000, 0x200, 0x400, 0x600, MODE_HYP,
0, 0, 0, 0, false, false, false, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<SecureMonitorTrap>::vals(
"Secure Monitor Trap", 0x004, 0x000, 0x200, 0x400, 0x600, MODE_MON,
4, 2, 0, 0, false, false, false, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<Interrupt>::vals(
"IRQ", 0x018, 0x080, 0x280, 0x480, 0x680, MODE_IRQ,
4, 4, 0, 0, false, true, false, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<VirtualInterrupt>::vals(
"Virtual IRQ", 0x018, 0x080, 0x280, 0x480, 0x680, MODE_IRQ,
4, 4, 0, 0, false, true, false, ExceptionClass::INVALID
);
template<> ArmFault::FaultVals ArmFaultVals<FastInterrupt>::vals(
"FIQ", 0x01C, 0x100, 0x300, 0x500, 0x700, MODE_FIQ,
4, 4, 0, 0, false, true, true, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<VirtualFastInterrupt>::vals(
"Virtual FIQ", 0x01C, 0x100, 0x300, 0x500, 0x700, MODE_FIQ,
4, 4, 0, 0, false, true, true, ExceptionClass::INVALID
);
template<> ArmFault::FaultVals ArmFaultVals<IllegalInstSetStateFault>::vals(
"Illegal Inst Set State Fault", 0x004, 0x000, 0x200, 0x400, 0x600, MODE_UNDEFINED,
4, 2, 0, 0, true, false, false, ExceptionClass::ILLEGAL_INST
);
template<> ArmFault::FaultVals ArmFaultVals<SupervisorTrap>::vals(
// Some dummy values (SupervisorTrap is AArch64-only)
"Supervisor Trap", 0x014, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, false, false, false, ExceptionClass::UNKNOWN
);
template<> ArmFault::FaultVals ArmFaultVals<PCAlignmentFault>::vals(
// Some dummy values (PCAlignmentFault is AArch64-only)
"PC Alignment Fault", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::PC_ALIGNMENT
);
template<> ArmFault::FaultVals ArmFaultVals<SPAlignmentFault>::vals(
// Some dummy values (SPAlignmentFault is AArch64-only)
"SP Alignment Fault", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::STACK_PTR_ALIGNMENT
);
template<> ArmFault::FaultVals ArmFaultVals<SystemError>::vals(
// Some dummy values (SError is AArch64-only)
"SError", 0x000, 0x180, 0x380, 0x580, 0x780, MODE_SVC,
0, 0, 0, 0, false, true, true, ExceptionClass::SERROR
);
template<> ArmFault::FaultVals ArmFaultVals<SoftwareBreakpoint>::vals(
// Some dummy values (SoftwareBreakpoint is AArch64-only)
"Software Breakpoint", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::SOFTWARE_BREAKPOINT
);
template<> ArmFault::FaultVals ArmFaultVals<HardwareBreakpoint>::vals(
"Hardware Breakpoint", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::HW_BREAKPOINT
);
template<> ArmFault::FaultVals ArmFaultVals<Watchpoint>::vals(
"Watchpoint", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::WATCHPOINT
);
template<> ArmFault::FaultVals ArmFaultVals<SoftwareStepFault>::vals(
"SoftwareStep", 0x000, 0x000, 0x200, 0x400, 0x600, MODE_SVC,
0, 0, 0, 0, true, false, false, ExceptionClass::SOFTWARE_STEP
);
template<> ArmFault::FaultVals ArmFaultVals<ArmSev>::vals(
// Some dummy values
"ArmSev Flush", 0x000, 0x000, 0x000, 0x000, 0x000, MODE_SVC,
0, 0, 0, 0, false, true, true, ExceptionClass::UNKNOWN
);
Addr
ArmFault::getVector(ThreadContext *tc)
{
Addr base;
// Check for invalid modes
CPSR cpsr = tc->readMiscRegNoEffect(MISCREG_CPSR);
assert(ArmSystem::haveEL(tc, EL3) || cpsr.mode != MODE_MON);
assert(ArmSystem::haveEL(tc, EL2) || cpsr.mode != MODE_HYP);
switch (cpsr.mode)
{
case MODE_MON:
base = tc->readMiscReg(MISCREG_MVBAR);
break;
case MODE_HYP:
base = tc->readMiscReg(MISCREG_HVBAR);
break;
default:
SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
if (sctlr.v) {
base = HighVecs;
} else {
base = ArmSystem::haveEL(tc, EL3) ?
tc->readMiscReg(MISCREG_VBAR) : 0;
}
break;
}
return base + offset(tc);
}
Addr
ArmFault::getVector64(ThreadContext *tc)
{
Addr vbar;
switch (toEL) {
case EL3:
assert(ArmSystem::haveEL(tc, EL3));
vbar = tc->readMiscReg(MISCREG_VBAR_EL3);
break;
case EL2:
assert(ArmSystem::haveEL(tc, EL2));
vbar = tc->readMiscReg(MISCREG_VBAR_EL2);
break;
case EL1:
vbar = tc->readMiscReg(MISCREG_VBAR_EL1);
break;
default:
panic("Invalid target exception level");
break;
}
return vbar + offset64(tc);
}
MiscRegIndex
ArmFault::getSyndromeReg64() const
{
switch (toEL) {
case EL1:
return MISCREG_ESR_EL1;
case EL2:
return MISCREG_ESR_EL2;
case EL3:
return MISCREG_ESR_EL3;
default:
panic("Invalid exception level");
break;
}
}
MiscRegIndex
ArmFault::getFaultAddrReg64() const
{
switch (toEL) {
case EL1:
return MISCREG_FAR_EL1;
case EL2:
return MISCREG_FAR_EL2;
case EL3:
return MISCREG_FAR_EL3;
default:
panic("Invalid exception level");
break;
}
}
void
ArmFault::setSyndrome(ThreadContext *tc, MiscRegIndex syndrome_reg)
{
ESR esr = 0;
uint32_t exc_class = (uint32_t) ec(tc);
uint32_t iss_val = iss();
assert(!from64 || ArmSystem::highestELIs64(tc));
esr.ec = exc_class;
esr.il = il(tc);
// Condition code valid for EC[5:4] nonzero
if (!from64 && ((bits(exc_class, 5, 4) == 0) &&
(bits(exc_class, 3, 0) != 0))) {
if (!machInst.thumb) {
ConditionCode cond_code = (ConditionCode) (uint32_t) machInst.condCode;
// If its on unconditional instruction report with a cond code of
// 0xE, ie the unconditional code
esr.cond_iss.cv = 1;
esr.cond_iss.cond = (cond_code == COND_UC) ? COND_AL : cond_code;
}
esr.cond_iss.iss = bits(iss_val, 19, 0);
} else {
esr.iss = iss_val;
}
tc->setMiscReg(syndrome_reg, esr);
}
void
ArmFault::update(ThreadContext *tc)
{
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
// Determine source exception level and mode
fromMode = (OperatingMode) (uint8_t) cpsr.mode;
fromEL = opModeToEL(fromMode);
if (opModeIs64(fromMode))
from64 = true;
// Determine target exception level (aarch64) or target execution
// mode (aarch32).
if (ArmSystem::haveEL(tc, EL3) && routeToMonitor(tc)) {
toMode = MODE_MON;
toEL = EL3;
} else if (ArmSystem::haveEL(tc, EL2) && routeToHyp(tc)) {
toMode = MODE_HYP;
toEL = EL2;
hypRouted = true;
} else {
toMode = nextMode();
toEL = opModeToEL(toMode);
}
if (fromEL > toEL)
toEL = fromEL;
// Check for Set Priviledge Access Never, if PAN is supported
if (HaveExt(tc, ArmExtension::FEAT_PAN)) {
if (toEL == EL1) {
const SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR_EL1);
span = !sctlr.span;
}
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
if (toEL == EL2 && hcr.e2h && hcr.tge) {
const SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR_EL2);
span = !sctlr.span;
}
}
to64 = ELIs64(tc, toEL);
// The fault specific informations have been updated; it is
// now possible to use them inside the fault.
faultUpdated = true;
}
void
ArmFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
// Update fault state informations, like the starting mode (aarch32)
// or EL (aarch64) and the ending mode or EL.
// From the update function we are also evaluating if the fault must
// be handled in AArch64 mode (to64).
update(tc);
if (from64 != to64) {
// Switching modes, sync up versions of the vector register file.
if (from64) {
syncVecRegsToElems(tc);
} else {
syncVecElemsToRegs(tc);
}
}
if (to64) {
// Invoke exception handler in AArch64 state
invoke64(tc, inst);
} else {
// Invoke exception handler in AArch32 state
invoke32(tc, inst);
}
}
void
ArmFault::invoke32(ThreadContext *tc, const StaticInstPtr &inst)
{
// ARMv7 (ARM ARM issue C B1.9)
bool have_security = ArmSystem::haveEL(tc, EL3);
FaultBase::invoke(tc);
if (!FullSystem)
return;
SCTLR sctlr = tc->readMiscReg(MISCREG_SCTLR);
SCR scr = tc->readMiscReg(MISCREG_SCR_EL3);
CPSR saved_cpsr = tc->readMiscReg(MISCREG_CPSR);
saved_cpsr.nz = tc->getReg(cc_reg::Nz);
saved_cpsr.c = tc->getReg(cc_reg::C);
saved_cpsr.v = tc->getReg(cc_reg::V);
saved_cpsr.ge = tc->getReg(cc_reg::Ge);
[[maybe_unused]] Addr cur_pc = tc->pcState().as<PCState>().pc();
ITSTATE it = tc->pcState().as<PCState>().itstate();
saved_cpsr.it2 = it.top6;
saved_cpsr.it1 = it.bottom2;
// if we have a valid instruction then use it to annotate this fault with
// extra information. This is used to generate the correct fault syndrome
// information
[[maybe_unused]] ArmStaticInst *arm_inst = instrAnnotate(inst);
// Ensure Secure state if initially in Monitor mode
if (have_security && saved_cpsr.mode == MODE_MON) {
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
if (scr.ns) {
scr.ns = 0;
tc->setMiscRegNoEffect(MISCREG_SCR_EL3, scr);
}
}
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
cpsr.mode = toMode;
// some bits are set differently if we have been routed to hyp mode
if (cpsr.mode == MODE_HYP) {
SCTLR hsctlr = tc->readMiscReg(MISCREG_HSCTLR);
cpsr.t = hsctlr.te;
cpsr.e = hsctlr.ee;
if (!scr.ea) {cpsr.a = 1;}
if (!scr.fiq) {cpsr.f = 1;}
if (!scr.irq) {cpsr.i = 1;}
} else if (cpsr.mode == MODE_MON) {
// Special case handling when entering monitor mode
cpsr.t = sctlr.te;
cpsr.e = sctlr.ee;
cpsr.a = 1;
cpsr.f = 1;
cpsr.i = 1;
} else {
cpsr.t = sctlr.te;
cpsr.e = sctlr.ee;
// The *Disable functions are virtual and different per fault
cpsr.a = cpsr.a | abortDisable(tc);
cpsr.f = cpsr.f | fiqDisable(tc);
cpsr.i = 1;
}
cpsr.it1 = cpsr.it2 = 0;
cpsr.j = 0;
cpsr.pan = span ? 1 : saved_cpsr.pan;
tc->setMiscReg(MISCREG_CPSR, cpsr);
// Make sure mailbox sets to one always
tc->setMiscReg(MISCREG_SEV_MAILBOX, 1);
// Clear the exclusive monitor
tc->setMiscReg(MISCREG_LOCKFLAG, 0);
if (cpsr.mode == MODE_HYP) {
tc->setMiscReg(MISCREG_ELR_HYP, cur_pc +
(saved_cpsr.t ? thumbPcOffset(true) : armPcOffset(true)));
} else {
tc->setReg(int_reg::Lr, cur_pc +
(saved_cpsr.t ? thumbPcOffset(false) : armPcOffset(false)));
}
switch (cpsr.mode) {
case MODE_FIQ:
tc->setMiscReg(MISCREG_SPSR_FIQ, saved_cpsr);
break;
case MODE_IRQ:
tc->setMiscReg(MISCREG_SPSR_IRQ, saved_cpsr);
break;
case MODE_SVC:
tc->setMiscReg(MISCREG_SPSR_SVC, saved_cpsr);
break;
case MODE_MON:
assert(have_security);
tc->setMiscReg(MISCREG_SPSR_MON, saved_cpsr);
break;
case MODE_ABORT:
tc->setMiscReg(MISCREG_SPSR_ABT, saved_cpsr);
break;
case MODE_UNDEFINED:
tc->setMiscReg(MISCREG_SPSR_UND, saved_cpsr);
if (ec(tc) != ExceptionClass::UNKNOWN)
setSyndrome(tc, MISCREG_HSR);
break;
case MODE_HYP:
assert(ArmSystem::haveEL(tc, EL2));
tc->setMiscReg(MISCREG_SPSR_HYP, saved_cpsr);
setSyndrome(tc, MISCREG_HSR);
break;
default:
panic("unknown Mode\n");
}
Addr new_pc = getVector(tc);
DPRINTF(Faults, "Invoking Fault:%s cpsr:%#x PC:%#x lr:%#x newVec: %#x "
"%s\n", name(), cpsr, cur_pc, tc->getReg(int_reg::Lr),
new_pc, arm_inst ? csprintf("inst: %#x", arm_inst->encoding()) :
std::string());
PCState pc(new_pc);
pc.thumb(cpsr.t);
pc.nextThumb(pc.thumb());
pc.jazelle(cpsr.j);
pc.nextJazelle(pc.jazelle());
pc.aarch64(!cpsr.width);
pc.nextAArch64(!cpsr.width);
pc.illegalExec(false);
tc->pcState(pc);
}
void
ArmFault::invoke64(ThreadContext *tc, const StaticInstPtr &inst)
{
// Determine actual misc. register indices for ELR_ELx and SPSR_ELx
MiscRegIndex elr_idx, spsr_idx;
switch (toEL) {
case EL1:
elr_idx = MISCREG_ELR_EL1;
spsr_idx = MISCREG_SPSR_EL1;
break;
case EL2:
assert(ArmSystem::haveEL(tc, EL2));
elr_idx = MISCREG_ELR_EL2;
spsr_idx = MISCREG_SPSR_EL2;
break;
case EL3:
assert(ArmSystem::haveEL(tc, EL3));
elr_idx = MISCREG_ELR_EL3;
spsr_idx = MISCREG_SPSR_EL3;
break;
default:
panic("Invalid target exception level");
break;
}
// Save process state into SPSR_ELx
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
CPSR spsr = cpsr;
spsr.nz = tc->getReg(cc_reg::Nz);
spsr.c = tc->getReg(cc_reg::C);
spsr.v = tc->getReg(cc_reg::V);
spsr.ss = isResetSPSR() ? 0: cpsr.ss;
if (from64) {
// Force some bitfields to 0
spsr.q = 0;
spsr.it1 = 0;
spsr.j = 0;
spsr.ge = 0;
spsr.it2 = 0;
spsr.t = 0;
} else {
spsr.ge = tc->getReg(cc_reg::Ge);
ITSTATE it = tc->pcState().as<PCState>().itstate();
spsr.it2 = it.top6;
spsr.it1 = it.bottom2;
spsr.uao = 0;
}
tc->setMiscReg(spsr_idx, spsr);
// Save preferred return address into ELR_ELx
Addr curr_pc = tc->pcState().instAddr();
Addr ret_addr = curr_pc;
if (from64)
ret_addr += armPcElrOffset();
else
ret_addr += spsr.t ? thumbPcElrOffset() : armPcElrOffset();
tc->setMiscReg(elr_idx, ret_addr);
Addr vec_address = getVector64(tc);
// Update process state
OperatingMode64 mode = 0;
mode.spX = 1;
mode.el = toEL;
mode.width = 0;
cpsr.mode = mode;
cpsr.daif = 0xf;
cpsr.il = 0;
cpsr.ss = 0;
cpsr.pan = span ? 1 : spsr.pan;
cpsr.uao = 0;
tc->setMiscReg(MISCREG_CPSR, cpsr);
// If we have a valid instruction then use it to annotate this fault with
// extra information. This is used to generate the correct fault syndrome
// information
[[maybe_unused]] ArmStaticInst *arm_inst = instrAnnotate(inst);
// Set PC to start of exception handler
Addr new_pc = purifyTaggedAddr(vec_address, tc, toEL, true);
DPRINTF(Faults, "Invoking Fault (AArch64 target EL):%s cpsr:%#x PC:%#x "
"elr:%#x newVec: %#x %s\n", name(), cpsr, curr_pc, ret_addr,
new_pc, arm_inst ? csprintf("inst: %#x", arm_inst->encoding()) :
std::string());
PCState pc(new_pc);
pc.aarch64(!cpsr.width);
pc.nextAArch64(!cpsr.width);
pc.illegalExec(false);
pc.stepped(false);
tc->pcState(pc);
// Save exception syndrome
if ((nextMode() != MODE_IRQ) && (nextMode() != MODE_FIQ))
setSyndrome(tc, getSyndromeReg64());
}
ArmStaticInst *
ArmFault::instrAnnotate(const StaticInstPtr &inst)
{
if (inst) {
auto arm_inst = static_cast<ArmStaticInst *>(inst.get());
arm_inst->annotateFault(this);
return arm_inst;
} else {
return nullptr;
}
}
Addr
Reset::getVector(ThreadContext *tc)
{
Addr base;
// Check for invalid modes
[[maybe_unused]] CPSR cpsr = tc->readMiscRegNoEffect(MISCREG_CPSR);
assert(ArmSystem::haveEL(tc, EL3) || cpsr.mode != MODE_MON);
assert(ArmSystem::haveEL(tc, EL2) || cpsr.mode != MODE_HYP);
// RVBAR is aliased (implemented as) MVBAR in gem5, since the two
// are mutually exclusive; there is no need to check here for
// which register to use since they hold the same value
base = tc->readMiscReg(MISCREG_MVBAR);
return base + offset(tc);
}
void
Reset::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
tc->getCpuPtr()->clearInterrupts(tc->threadId());
tc->clearArchRegs();
}
if (!ArmSystem::highestELIs64(tc)) {
ArmFault::invoke(tc, inst);
tc->setMiscReg(MISCREG_VMPIDR,
getMPIDR(dynamic_cast<ArmSystem*>(tc->getSystemPtr()), tc));
// Unless we have SMC code to get us there, boot in HYP!
if (ArmSystem::haveEL(tc, EL2) &&
!ArmSystem::haveEL(tc, EL3)) {
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
cpsr.mode = MODE_HYP;
tc->setMiscReg(MISCREG_CPSR, cpsr);
}
} else {
// Advance the PC to the IMPLEMENTATION DEFINED reset value
PCState pc(ArmSystem::resetAddr(tc));
pc.aarch64(true);
pc.nextAArch64(true);
tc->pcState(pc);
}
}
void
UndefinedInstruction::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
ArmFault::invoke(tc, inst);
return;
}
// If the mnemonic isn't defined this has to be an unknown instruction.
assert(unknown || mnemonic != NULL);
auto arm_inst = static_cast<ArmStaticInst *>(inst.get());
if (disabled) {
panic("Attempted to execute disabled instruction "
"'%s' (inst 0x%08x)", mnemonic, arm_inst->encoding());
} else if (unknown) {
panic("Attempted to execute unknown instruction (inst 0x%08x)",
arm_inst->encoding());
} else {
panic("Attempted to execute unimplemented instruction "
"'%s' (inst 0x%08x)", mnemonic, arm_inst->encoding());
}
}
bool
UndefinedInstruction::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && (fromEL == EL0) && hcr.tge);
}
uint32_t
UndefinedInstruction::iss() const
{
// If UndefinedInstruction is routed to hypervisor, iss field is 0.
if (hypRouted) {
return 0;
}
if (overrideEc == ExceptionClass::INVALID)
return issRaw;
uint32_t new_iss = 0;
uint32_t op0, op1, op2, CRn, CRm, Rt, dir;
dir = bits(machInst, 21, 21);
op0 = bits(machInst, 20, 19);
op1 = bits(machInst, 18, 16);
CRn = bits(machInst, 15, 12);
CRm = bits(machInst, 11, 8);
op2 = bits(machInst, 7, 5);
Rt = bits(machInst, 4, 0);
new_iss = op0 << 20 | op2 << 17 | op1 << 14 | CRn << 10 |
Rt << 5 | CRm << 1 | dir;
return new_iss;
}
void
SupervisorCall::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
ArmFault::invoke(tc, inst);
return;
}
// Advance the PC since that won't happen automatically.
PCState pc = tc->pcState().as<PCState>();
assert(inst);
inst->advancePC(pc);
tc->pcState(pc);
// As of now, there isn't a 32 bit thumb version of this instruction.
assert(!machInst.bigThumb);
tc->getSystemPtr()->workload->syscall(tc);
}
bool
SupervisorCall::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL == EL0 && hcr.tge);
}
ExceptionClass
SupervisorCall::ec(ThreadContext *tc) const
{
return (overrideEc != ExceptionClass::INVALID) ? overrideEc :
(from64 ? ExceptionClass::SVC_64 : vals.ec);
}
uint32_t
SupervisorCall::iss() const
{
// Even if we have a 24 bit imm from an arm32 instruction then we only use
// the bottom 16 bits for the ISS value (it doesn't hurt for AArch64 SVC).
return issRaw & 0xFFFF;
}
uint32_t
SecureMonitorCall::iss() const
{
if (from64)
return bits(machInst, 20, 5);
return 0;
}
ExceptionClass
UndefinedInstruction::ec(ThreadContext *tc) const
{
// If UndefinedInstruction is routed to hypervisor,
// HSR.EC field is 0.
if (hypRouted)
return ExceptionClass::UNKNOWN;
else
return (overrideEc != ExceptionClass::INVALID) ? overrideEc : vals.ec;
}
HypervisorCall::HypervisorCall(ExtMachInst mach_inst, uint32_t _imm) :
ArmFaultVals<HypervisorCall>(mach_inst, _imm)
{
bStep = true;
}
bool
HypervisorCall::routeToMonitor(ThreadContext *tc) const
{
return from64 && fromEL == EL3;
}
bool
HypervisorCall::routeToHyp(ThreadContext *tc) const
{
return !from64 || fromEL != EL3;
}
ExceptionClass
HypervisorCall::ec(ThreadContext *tc) const
{
return from64 ? ExceptionClass::HVC_64 : vals.ec;
}
ExceptionClass
HypervisorTrap::ec(ThreadContext *tc) const
{
return (overrideEc != ExceptionClass::INVALID) ? overrideEc : vals.ec;
}
template<class T>
FaultOffset
ArmFaultVals<T>::offset(ThreadContext *tc)
{
bool isHypTrap = false;
// Normally we just use the exception vector from the table at the top if
// this file, however if this exception has caused a transition to hype
// mode, and its an exception type that would only do this if it has been
// trapped then we use the hyp trap vector instead of the normal vector
if (vals.hypTrappable) {
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
if (cpsr.mode == MODE_HYP) {
CPSR spsr = tc->readMiscReg(MISCREG_SPSR_HYP);
isHypTrap = spsr.mode != MODE_HYP;
}
}
return isHypTrap ? 0x14 : vals.offset;
}
template<class T>
FaultOffset
ArmFaultVals<T>::offset64(ThreadContext *tc)
{
if (toEL == fromEL) {
if (opModeIsT(fromMode))
return vals.currELTOffset;
return vals.currELHOffset;
} else {
bool lower_32 = false;
if (toEL == EL3) {
if (EL2Enabled(tc))
lower_32 = ELIs32(tc, EL2);
else
lower_32 = ELIs32(tc, EL1);
} else if (ELIsInHost(tc, fromEL) && fromEL == EL0 && toEL == EL2) {
lower_32 = ELIs32(tc, EL0);
} else {
lower_32 = ELIs32(tc, static_cast<ExceptionLevel>(toEL - 1));
}
if (lower_32)
return vals.lowerEL32Offset;
return vals.lowerEL64Offset;
}
}
// void
// SupervisorCall::setSyndrome64(ThreadContext *tc, MiscRegIndex esr_idx)
// {
// ESR esr = 0;
// esr.ec = machInst.aarch64 ? SvcAArch64 : SvcAArch32;
// esr.il = !machInst.thumb;
// if (machInst.aarch64)
// esr.imm16 = bits(machInst.instBits, 20, 5);
// else if (machInst.thumb)
// esr.imm16 = bits(machInst.instBits, 7, 0);
// else
// esr.imm16 = bits(machInst.instBits, 15, 0);
// tc->setMiscReg(esr_idx, esr);
// }
void
SecureMonitorCall::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (FullSystem) {
ArmFault::invoke(tc, inst);
return;
}
}
ExceptionClass
SecureMonitorCall::ec(ThreadContext *tc) const
{
return (from64 ? ExceptionClass::SMC_64 : vals.ec);
}
bool
SupervisorTrap::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return EL2Enabled(tc) && currEL(tc) <= EL1 && hcr.tge;
}
uint32_t
SupervisorTrap::iss() const
{
// If SupervisorTrap is routed to hypervisor, iss field is 0.
if (hypRouted) {
return 0;
}
return issRaw;
}
ExceptionClass
SupervisorTrap::ec(ThreadContext *tc) const
{
if (hypRouted)
return ExceptionClass::UNKNOWN;
else
return (overrideEc != ExceptionClass::INVALID) ? overrideEc : vals.ec;
}
ExceptionClass
SecureMonitorTrap::ec(ThreadContext *tc) const
{
return (overrideEc != ExceptionClass::INVALID) ? overrideEc :
(from64 ? ExceptionClass::SMC_64 : vals.ec);
}
template<class T>
void
AbortFault<T>::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
if (tranMethod == ArmFault::UnknownTran) {
tranMethod = longDescFormatInUse(tc) ? ArmFault::LpaeTran
: ArmFault::VmsaTran;
if ((tranMethod == ArmFault::VmsaTran) && this->routeToMonitor(tc)) {
// See ARM ARM B3-1416
bool override_LPAE = false;
TTBCR ttbcr_s = tc->readMiscReg(MISCREG_TTBCR_S);
[[maybe_unused]] TTBCR ttbcr_ns =
tc->readMiscReg(MISCREG_TTBCR_NS);
if (ttbcr_s.eae) {
override_LPAE = true;
} else {
// Unimplemented code option, not seen in testing. May need
// extension according to the manual exceprt above.
DPRINTF(Faults, "Warning: Incomplete translation method "
"override detected.\n");
}
if (override_LPAE)
tranMethod = ArmFault::LpaeTran;
}
}
if (source == ArmFault::AsynchronousExternalAbort) {
tc->getCpuPtr()->clearInterrupt(tc->threadId(), INT_ABT, 0);
}
// Get effective fault source encoding
CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
// source must be determined BEFORE invoking generic routines which will
// try to set hsr etc. and are based upon source!
ArmFaultVals<T>::invoke(tc, inst);
if (!this->to64) { // AArch32
FSR fsr = getFsr(tc);
if (cpsr.mode == MODE_HYP) {
tc->setMiscReg(T::HFarIndex, faultAddr);
} else if (stage2) {
tc->setMiscReg(MISCREG_HPFAR, (faultAddr >> 8) & ~0xf);
tc->setMiscReg(T::HFarIndex, OVAddr);
} else if (debugType > ArmFault::NODEBUG) {
DBGDS32 Rext = tc->readMiscReg(MISCREG_DBGDSCRext);
tc->setMiscReg(T::FarIndex, faultAddr);
if (debugType == ArmFault::BRKPOINT){
Rext.moe = 0x1;
} else if (debugType == ArmFault::VECTORCATCH){
Rext.moe = 0x5;
} else if (debugType > ArmFault::VECTORCATCH) {
Rext.moe = 0xa;
fsr.cm = (debugType == ArmFault::WPOINT_CM)? 1 : 0;
}
tc->setMiscReg(T::FsrIndex, fsr);
tc->setMiscReg(MISCREG_DBGDSCRext, Rext);
} else {
tc->setMiscReg(T::FsrIndex, fsr);
tc->setMiscReg(T::FarIndex, faultAddr);
}
DPRINTF(Faults, "Abort Fault source=%#x fsr=%#x faultAddr=%#x "\
"tranMethod=%#x\n", source, fsr, faultAddr, tranMethod);
} else { // AArch64
// Set the FAR register. Nothing else to do if we are in AArch64 state
// because the syndrome register has already been set inside invoke64()
if (stage2) {
// stage 2 fault, set HPFAR_EL2 to the faulting IPA
// and FAR_EL2 to the Original VA
tc->setMiscReg(AbortFault<T>::getFaultAddrReg64(), OVAddr);
tc->setMiscReg(MISCREG_HPFAR_EL2, bits(faultAddr, 47, 12) << 4);
DPRINTF(Faults, "Abort Fault (Stage 2) VA: 0x%x IPA: 0x%x\n",
OVAddr, faultAddr);
} else {
tc->setMiscReg(AbortFault<T>::getFaultAddrReg64(), faultAddr);
}
}
}
template<class T>
void
AbortFault<T>::setSyndrome(ThreadContext *tc, MiscRegIndex syndrome_reg)
{
srcEncoded = getFaultStatusCode(tc);
if (srcEncoded == ArmFault::FaultSourceInvalid) {
panic("Invalid fault source\n");
}
ArmFault::setSyndrome(tc, syndrome_reg);
}
template<class T>
uint8_t
AbortFault<T>::getFaultStatusCode(ThreadContext *tc) const
{
panic_if(!this->faultUpdated,
"Trying to use un-updated ArmFault internal variables\n");
uint8_t fsc = 0;
if (!this->to64) {
// AArch32
assert(tranMethod != ArmFault::UnknownTran);
if (tranMethod == ArmFault::LpaeTran) {
fsc = ArmFault::longDescFaultSources[source];
} else {
fsc = ArmFault::shortDescFaultSources[source];
}
} else {
// AArch64
fsc = ArmFault::aarch64FaultSources[source];
}
return fsc;
}
template<class T>
FSR
AbortFault<T>::getFsr(ThreadContext *tc) const
{
FSR fsr = 0;
auto fsc = getFaultStatusCode(tc);
// AArch32
assert(tranMethod != ArmFault::UnknownTran);
if (tranMethod == ArmFault::LpaeTran) {
fsr.status = fsc;
fsr.lpae = 1;
} else {
fsr.fsLow = bits(fsc, 3, 0);
fsr.fsHigh = bits(fsc, 4);
fsr.domain = static_cast<uint8_t>(domain);
}
fsr.wnr = (write ? 1 : 0);
fsr.ext = 0;
return fsr;
}
template<class T>
bool
AbortFault<T>::abortDisable(ThreadContext *tc)
{
if (ArmSystem::haveEL(tc, EL3)) {
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return (!scr.ns || scr.aw);
}
return true;
}
template<class T>
void
AbortFault<T>::annotate(ArmFault::AnnotationIDs id, uint64_t val)
{
switch (id)
{
case ArmFault::S1PTW:
s1ptw = val;
break;
case ArmFault::OVA:
OVAddr = val;
break;
// Just ignore unknown ID's
default:
break;
}
}
template<class T>
bool
AbortFault<T>::isMMUFault() const
{
// NOTE: Not relying on LL information being aligned to lowest bits here
return
(source == ArmFault::AlignmentFault) ||
((source >= ArmFault::TranslationLL) &&
(source < ArmFault::TranslationLL + 4)) ||
((source >= ArmFault::AccessFlagLL) &&
(source < ArmFault::AccessFlagLL + 4)) ||
((source >= ArmFault::DomainLL) &&
(source < ArmFault::DomainLL + 4)) ||
((source >= ArmFault::PermissionLL) &&
(source < ArmFault::PermissionLL + 4));
}
template<class T>
bool
AbortFault<T>::getFaultVAddr(Addr &va) const
{
va = (stage2 ? OVAddr : faultAddr);
return true;
}
ExceptionClass
PrefetchAbort::ec(ThreadContext *tc) const
{
if (to64) {
// AArch64
if (toEL == fromEL)
return ExceptionClass::PREFETCH_ABORT_CURR_EL;
else
return ExceptionClass::PREFETCH_ABORT_LOWER_EL;
} else {
// AArch32
// Abort faults have different EC codes depending on whether
// the fault originated within HYP mode, or not. So override
// the method and add the extra adjustment of the EC value.
ExceptionClass ec = ArmFaultVals<PrefetchAbort>::vals.ec;
CPSR spsr = tc->readMiscReg(MISCREG_SPSR_HYP);
if (spsr.mode == MODE_HYP) {
ec = ((ExceptionClass) (((uint32_t) ec) + 1));
}
return ec;
}
}
uint32_t
PrefetchAbort::iss() const
{
ESR esr = 0;
auto& iss = esr.instruction_abort_iss;
iss.ifsc = srcEncoded & 0x3F;
iss.s1ptw = s1ptw;
return iss;
}
bool
PrefetchAbort::routeToMonitor(ThreadContext *tc) const
{
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return scr.ea && !isMMUFault();
}
bool
PrefetchAbort::routeToHyp(ThreadContext *tc) const
{
bool toHyp;
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
HDCR hdcr = tc->readMiscRegNoEffect(MISCREG_HDCR);
toHyp = fromEL == EL2;
toHyp |= ArmSystem::haveEL(tc, EL2) && !isSecure(tc) &&
currEL(tc) <= EL1 && (hcr.tge || stage2 ||
(source == DebugEvent && hdcr.tde));
return toHyp;
}
ExceptionClass
DataAbort::ec(ThreadContext *tc) const
{
if (to64) {
// AArch64
if (source == ArmFault::AsynchronousExternalAbort) {
panic("Asynchronous External Abort should be handled with "
"SystemErrors (SErrors)!");
}
if (toEL == fromEL)
return ExceptionClass::DATA_ABORT_CURR_EL;
else
return ExceptionClass::DATA_ABORT_LOWER_EL;
} else {
// AArch32
// Abort faults have different EC codes depending on whether
// the fault originated within HYP mode, or not. So override
// the method and add the extra adjustment of the EC value.
ExceptionClass ec = ArmFaultVals<DataAbort>::vals.ec;
CPSR spsr = tc->readMiscReg(MISCREG_SPSR_HYP);
if (spsr.mode == MODE_HYP) {
ec = ((ExceptionClass) (((uint32_t) ec) + 1));
}
return ec;
}
}
bool
DataAbort::il(ThreadContext *tc) const
{
return !isv? true : AbortFault<DataAbort>::il(tc);
}
bool
DataAbort::routeToMonitor(ThreadContext *tc) const
{
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return scr.ea && !isMMUFault();
}
bool
DataAbort::routeToHyp(ThreadContext *tc) const
{
bool toHyp;
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
HDCR hdcr = tc->readMiscRegNoEffect(MISCREG_HDCR);
bool amo = hcr.amo;
if (hcr.tge == 1)
amo = (!HaveExt(tc, ArmExtension::FEAT_VHE) || hcr.e2h == 0);
// if in Hyp mode then stay in Hyp mode
toHyp = fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1
&& (hcr.tge || stage2 ||
((source == AsynchronousExternalAbort) && amo) ||
((fromEL == EL0) && hcr.tge &&
((source == AlignmentFault) ||
(source == SynchronousExternalAbort))) ||
((source == DebugEvent) && (hdcr.tde || hcr.tge))));
return toHyp;
}
uint32_t
DataAbort::iss() const
{
ESR esr = 0;
auto& iss = esr.data_abort_iss;
iss.dfsc = srcEncoded & 0x3F;
iss.wnr = write;
iss.s1ptw = s1ptw;
iss.cm = cm;
// ISS is valid if not caused by a stage 1 page table walk, and when taken
// to AArch64 only when directed to EL2
if (!s1ptw && stage2 && (!to64 || toEL == EL2)) {
iss.isv = isv;
if (isv) {
iss.sas = sas;
iss.sse = sse;
iss.srt = srt;
// AArch64 only. These assignments are safe on AArch32 as well
// because these vars are initialized to false
iss.sf = sf;
iss.ar = ar;
}
}
return iss;
}
void
DataAbort::annotate(AnnotationIDs id, uint64_t val)
{
AbortFault<DataAbort>::annotate(id, val);
switch (id)
{
case SAS:
isv = true;
sas = val;
break;
case SSE:
isv = true;
sse = val;
break;
case SRT:
isv = true;
srt = val;
break;
case SF:
isv = true;
sf = val;
break;
case AR:
isv = true;
ar = val;
break;
case CM:
cm = val;
break;
case OFA:
faultAddr = val;
break;
// Just ignore unknown ID's
default:
break;
}
}
void
VirtualDataAbort::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
AbortFault<VirtualDataAbort>::invoke(tc, inst);
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
hcr.va = 0;
tc->setMiscRegNoEffect(MISCREG_HCR_EL2, hcr);
}
bool
Interrupt::routeToMonitor(ThreadContext *tc) const
{
assert(ArmSystem::haveEL(tc, EL3));
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return scr.irq;
}
bool
Interrupt::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || hcr.imo));
}
bool
Interrupt::abortDisable(ThreadContext *tc)
{
if (ArmSystem::haveEL(tc, EL3)) {
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return (!scr.ns || scr.aw);
}
return true;
}
VirtualInterrupt::VirtualInterrupt()
{}
bool
FastInterrupt::routeToMonitor(ThreadContext *tc) const
{
assert(ArmSystem::haveEL(tc, EL3));
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return scr.fiq;
}
bool
FastInterrupt::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || hcr.fmo));
}
bool
FastInterrupt::abortDisable(ThreadContext *tc)
{
if (ArmSystem::haveEL(tc, EL3)) {
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return (!scr.ns || scr.aw);
}
return true;
}
bool
FastInterrupt::fiqDisable(ThreadContext *tc)
{
if (ArmSystem::haveEL(tc, EL2)) {
return true;
} else if (ArmSystem::haveEL(tc, EL3)) {
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return (!scr.ns || scr.fw);
}
return true;
}
VirtualFastInterrupt::VirtualFastInterrupt()
{}
void
PCAlignmentFault::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
ArmFaultVals<PCAlignmentFault>::invoke(tc, inst);
assert(from64);
// Set the FAR
tc->setMiscReg(getFaultAddrReg64(), faultPC);
}
bool
PCAlignmentFault::routeToHyp(ThreadContext *tc) const
{
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 || (EL2Enabled(tc) && fromEL <= EL1 && hcr.tge);
}
SPAlignmentFault::SPAlignmentFault()
{}
bool
SPAlignmentFault::routeToHyp(ThreadContext *tc) const
{
assert(from64);
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return EL2Enabled(tc) && currEL(tc) <= EL1 && hcr.tge == 1;
}
SystemError::SystemError()
{}
void
SystemError::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
tc->getCpuPtr()->clearInterrupt(tc->threadId(), INT_ABT, 0);
ArmFault::invoke(tc, inst);
}
bool
SystemError::routeToMonitor(ThreadContext *tc) const
{
assert(ArmSystem::haveEL(tc, EL3));
assert(from64);
SCR scr = tc->readMiscRegNoEffect(MISCREG_SCR_EL3);
return scr.ea || fromEL == EL3;
}
bool
SystemError::routeToHyp(ThreadContext *tc) const
{
assert(from64);
HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || hcr.amo));
}
SoftwareBreakpoint::SoftwareBreakpoint(ExtMachInst mach_inst, uint32_t _iss)
: ArmFaultVals<SoftwareBreakpoint>(mach_inst, _iss)
{}
bool
SoftwareBreakpoint::routeToHyp(ThreadContext *tc) const
{
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
const HDCR mdcr = tc->readMiscRegNoEffect(MISCREG_MDCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || mdcr.tde));
}
ExceptionClass
SoftwareBreakpoint::ec(ThreadContext *tc) const
{
return from64 ? ExceptionClass::SOFTWARE_BREAKPOINT_64 : vals.ec;
}
HardwareBreakpoint::HardwareBreakpoint(Addr vaddr, uint32_t _iss)
: ArmFaultVals<HardwareBreakpoint>(0x0, _iss), vAddr(vaddr)
{}
bool
HardwareBreakpoint::routeToHyp(ThreadContext *tc) const
{
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
const HDCR mdcr = tc->readMiscRegNoEffect(MISCREG_MDCR_EL2);
return EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || mdcr.tde);
}
ExceptionClass
HardwareBreakpoint::ec(ThreadContext *tc) const
{
// AArch64
if (toEL == fromEL)
return ExceptionClass::HW_BREAKPOINT_CURR_EL;
else
return ExceptionClass::HW_BREAKPOINT_LOWER_EL;
}
void
HardwareBreakpoint::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
ArmFaultVals<HardwareBreakpoint>::invoke(tc, inst);
MiscRegIndex elr_idx;
switch (toEL) {
case EL1:
elr_idx = MISCREG_ELR_EL1;
break;
case EL2:
assert(ArmSystem::haveEL(tc, EL2));
elr_idx = MISCREG_ELR_EL2;
break;
case EL3:
assert(ArmSystem::haveEL(tc, EL3));
elr_idx = MISCREG_ELR_EL3;
break;
default:
panic("Invalid target exception level");
break;
}
tc->setMiscReg(elr_idx, vAddr);
}
Watchpoint::Watchpoint(ExtMachInst mach_inst, Addr _vaddr,
bool _write, bool _cm)
: ArmFaultVals<Watchpoint>(mach_inst), vAddr(_vaddr),
write(_write), cm(_cm)
{}
uint32_t
Watchpoint::iss() const
{
ESR esr = 0;
auto& iss = esr.watchpoint_iss;
iss.dfsc = 0b100010;
iss.cm = cm;
iss.wnr = write;
return iss;
}
void
Watchpoint::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
ArmFaultVals<Watchpoint>::invoke(tc, inst);
// Set the FAR
tc->setMiscReg(getFaultAddrReg64(), vAddr);
}
bool
Watchpoint::routeToHyp(ThreadContext *tc) const
{
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
const HDCR mdcr = tc->readMiscRegNoEffect(MISCREG_MDCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || mdcr.tde));
}
void
Watchpoint::annotate(AnnotationIDs id, uint64_t val)
{
ArmFaultVals<Watchpoint>::annotate(id, val);
switch (id)
{
case OFA:
vAddr = val;
break;
// Just ignore unknown ID's
default:
break;
}
}
ExceptionClass
Watchpoint::ec(ThreadContext *tc) const
{
// AArch64
if (toEL == fromEL)
return ExceptionClass::WATCHPOINT_CURR_EL;
else
return ExceptionClass::WATCHPOINT_LOWER_EL;
}
SoftwareStepFault::SoftwareStepFault(ExtMachInst mach_inst, bool is_ldx,
bool _stepped)
: ArmFaultVals<SoftwareStepFault>(mach_inst), isldx(is_ldx),
stepped(_stepped)
{
bStep = true;
}
bool
SoftwareStepFault::routeToHyp(ThreadContext *tc) const
{
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
const HDCR mdcr = tc->readMiscRegNoEffect(MISCREG_MDCR_EL2);
return fromEL == EL2 ||
(EL2Enabled(tc) && fromEL <= EL1 && (hcr.tge || mdcr.tde));
}
ExceptionClass
SoftwareStepFault::ec(ThreadContext *tc) const
{
// AArch64
if (toEL == fromEL)
return ExceptionClass::SOFTWARE_STEP_CURR_EL;
else
return ExceptionClass::SOFTWARE_STEP_LOWER_EL;
}
uint32_t
SoftwareStepFault::iss() const
{
ESR esr = 0;
auto& iss = esr.software_step_iss;
iss.ifsc = 0b100010;
iss.isv = stepped;
iss.ex = isldx;
return iss;
}
void
ArmSev::invoke(ThreadContext *tc, const StaticInstPtr &inst)
{
DPRINTF(Faults, "Invoking ArmSev Fault\n");
if (!FullSystem)
return;
// Set sev_mailbox to 1, clear the pending interrupt from remote
// SEV execution and let pipeline continue as pcState is still
// valid.
tc->setMiscReg(MISCREG_SEV_MAILBOX, 1);
tc->getCpuPtr()->clearInterrupt(tc->threadId(), INT_SEV, 0);
}
// Instantiate all the templates to make the linker happy
template class ArmFaultVals<Reset>;
template class ArmFaultVals<UndefinedInstruction>;
template class ArmFaultVals<SupervisorCall>;
template class ArmFaultVals<SecureMonitorCall>;
template class ArmFaultVals<HypervisorCall>;
template class ArmFaultVals<PrefetchAbort>;
template class ArmFaultVals<DataAbort>;
template class ArmFaultVals<VirtualDataAbort>;
template class ArmFaultVals<HypervisorTrap>;
template class ArmFaultVals<Interrupt>;
template class ArmFaultVals<VirtualInterrupt>;
template class ArmFaultVals<FastInterrupt>;
template class ArmFaultVals<VirtualFastInterrupt>;
template class ArmFaultVals<SupervisorTrap>;
template class ArmFaultVals<SecureMonitorTrap>;
template class ArmFaultVals<PCAlignmentFault>;
template class ArmFaultVals<SPAlignmentFault>;
template class ArmFaultVals<SystemError>;
template class ArmFaultVals<SoftwareBreakpoint>;
template class ArmFaultVals<HardwareBreakpoint>;
template class ArmFaultVals<Watchpoint>;
template class ArmFaultVals<SoftwareStepFault>;
template class ArmFaultVals<ArmSev>;
template class AbortFault<PrefetchAbort>;
template class AbortFault<DataAbort>;
template class AbortFault<VirtualDataAbort>;
IllegalInstSetStateFault::IllegalInstSetStateFault()
{}
bool
IllegalInstSetStateFault::routeToHyp(ThreadContext *tc) const
{
const HCR hcr = tc->readMiscRegNoEffect(MISCREG_HCR_EL2);
return EL2Enabled(tc) && fromEL == EL0 && hcr.tge;
}
bool
getFaultVAddr(Fault fault, Addr &va)
{
auto arm_fault = dynamic_cast<ArmFault *>(fault.get());
if (arm_fault) {
return arm_fault->getFaultVAddr(va);
} else {
auto pgt_fault = dynamic_cast<GenericPageTableFault *>(fault.get());
if (pgt_fault) {
va = pgt_fault->getFaultVAddr();
return true;
}
auto align_fault = dynamic_cast<GenericAlignmentFault *>(fault.get());
if (align_fault) {
va = align_fault->getFaultVAddr();
return true;
}
// Return false since it's not an address triggered exception
return false;
}
}
} // namespace ArmISA
} // namespace gem5