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arch-arm: reg access permissions highest EL helper

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This patch implements a helper function to filter a register access
permissions by the highest EL implemented by the system.
This filtering is convenient to follow the architecture pseudocode.

Change-Id: Iedfb2d8624c926f2f0a9326f8b1b073ea9424ab9
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/24663
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Adrian Herrera
2019-11-06 13:00:21 +00:00
committed by Giacomo Travaglini
parent 6cff0dd218
commit 465f7d0f56
2 changed files with 15 additions and 2 deletions
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14
src/arch/arm/isa.cc
View File

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2010-2019 ARM Limited
* Copyright (c) 2010-2020 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -2190,6 +2190,18 @@ ISA::zeroSveVecRegUpperPart(VecRegContainer &vc, unsigned eCount)
}
}
ISA::MiscRegLUTEntryInitializer::chain
ISA::MiscRegLUTEntryInitializer::highest(ArmSystem *const sys) const
{
switch (FullSystem ? sys->highestEL() : EL1) {
case EL0:
case EL1: priv(); break;
case EL2: hyp(); break;
case EL3: mon(); break;
}
return *this;
}
} // namespace ArmISA
ArmISA::ISA *

3
src/arch/arm/isa.hh
View File

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2010, 2012-2019 ARM Limited
* Copyright (c) 2010, 2012-2020 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
@@ -357,6 +357,7 @@ namespace ArmISA
user(0);
return *this;
}
chain highest(ArmSystem *const sys) const;
MiscRegLUTEntryInitializer(struct MiscRegLUTEntry &e,
std::bitset<NUM_MISCREG_INFOS> &i)
: entry(e),