From ec9ce6239d0c3a4e6141961bfb9caae50b9caac9 Mon Sep 17 00:00:00 2001 From: Adrian Herrera Date: Wed, 6 Nov 2019 13:07:28 +0000 Subject: arch-arm: Secure EL2 checking This patch adds Armv8.4-SecEL2 checking. Helpers implementing EL2Enabled, IsSecureEL2Enabled and HaveSecureEL2Ext following the architecture pseudocode are provided. These are intended to be used for checking register access permissions. Change-Id: I3d06d0127cf165c1eeaf3302830742d610cef719 Reviewed-by: Giacomo Travaglini Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23766 Maintainer: Giacomo Travaglini Tested-by: kokoro --- src/arch/arm/miscregs_types.hh | 7 ++++--- src/arch/arm/utility.cc | 28 ++++++++++++++++++++++++++++ src/arch/arm/utility.hh | 4 ++++ 3 files changed, 36 insertions(+), 3 deletions(-) diff --git a/src/arch/arm/miscregs_types.hh b/src/arch/arm/miscregs_types.hh index 20265e294..07e2262b3 100644 --- a/src/arch/arm/miscregs_types.hh +++ b/src/arch/arm/miscregs_types.hh @@ -294,14 +294,15 @@ namespace ArmISA EndBitUnion(NSACR) BitUnion32(SCR) + Bitfield<18> eel2; // AArch64 (Armv8.4-SecEL2) Bitfield<13> twe; Bitfield<12> twi; - Bitfield<11> st; // AArch64 - Bitfield<10> rw; // AArch64 + Bitfield<11> st; // AArch64 + Bitfield<10> rw; // AArch64 Bitfield<9> sif; Bitfield<8> hce; Bitfield<7> scd; - Bitfield<7> smd; // AArch64 + Bitfield<7> smd; // AArch64 Bitfield<6> nEt; Bitfield<5> aw; Bitfield<4> fw; diff --git a/src/arch/arm/utility.cc b/src/arch/arm/utility.cc index d68850c5f..5ab56453b 100644 --- a/src/arch/arm/utility.cc +++ b/src/arch/arm/utility.cc @@ -289,6 +289,34 @@ getMPIDR(ArmSystem *arm_sys, ThreadContext *tc) } } +bool +HaveSecureEL2Ext(ThreadContext *tc) +{ + AA64PFR0 id_aa64pfr0 = tc->readMiscReg(MISCREG_ID_AA64PFR0_EL1); + return id_aa64pfr0.sel2; +} + +bool +IsSecureEL2Enabled(ThreadContext *tc) +{ + SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); + if (ArmSystem::haveEL(tc, EL2) && HaveSecureEL2Ext(tc)) { + if (ArmSystem::haveEL(tc, EL3)) + return !ELIs32(tc, EL3) && scr.eel2; + else + return inSecureState(tc); + } + return false; +} + +bool +EL2Enabled(ThreadContext *tc) +{ + SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); + return ArmSystem::haveEL(tc, EL2) && + (!ArmSystem::haveEL(tc, EL3) || scr.ns || IsSecureEL2Enabled(tc)); +} + bool ELIs64(ThreadContext *tc, ExceptionLevel el) { diff --git a/src/arch/arm/utility.hh b/src/arch/arm/utility.hh index 96f6843c3..7ec44f8e2 100644 --- a/src/arch/arm/utility.hh +++ b/src/arch/arm/utility.hh @@ -166,6 +166,10 @@ currEL(CPSR cpsr) return opModeToEL((OperatingMode) (uint8_t)cpsr.mode); } +bool HaveSecureEL2Ext(ThreadContext *tc); +bool IsSecureEL2Enabled(ThreadContext *tc); +bool EL2Enabled(ThreadContext *tc); + /** * This function checks whether selected EL provided as an argument * is using the AArch32 ISA. This information might be unavailable -- cgit v1.2.3