diff options
Diffstat (limited to 'src/arch/arm/tlb.cc')
| -rw-r--r-- | src/arch/arm/tlb.cc | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/src/arch/arm/tlb.cc b/src/arch/arm/tlb.cc index 3aebe3d59..aeaf60bdd 100644 --- a/src/arch/arm/tlb.cc +++ b/src/arch/arm/tlb.cc @@ -603,6 +603,12 @@ TLB::translateSe(RequestPtr req, ThreadContext *tc, Mode mode, Fault TLB::checkPermissions(TlbEntry *te, RequestPtr req, Mode mode) { + // a data cache maintenance instruction that operates by MVA does + // not generate a Data Abort exeception due to a Permission fault + if (req->isCacheMaintenance()) { + return NoFault; + } + Addr vaddr = req->getVaddr(); // 32-bit don't have to purify Request::Flags flags = req->getFlags(); bool is_fetch = (mode == Execute); @@ -778,12 +784,22 @@ TLB::checkPermissions64(TlbEntry *te, RequestPtr req, Mode mode, { assert(aarch64); + // A data cache maintenance instruction that operates by VA does + // not generate a Permission fault unless: + // * It is a data cache invalidate (dc ivac) which requires write + // permissions to the VA, or + // * It is executed from EL0 + if (req->isCacheClean() && aarch64EL != EL0 && !isStage2) { + return NoFault; + } + Addr vaddr_tainted = req->getVaddr(); Addr vaddr = purifyTaggedAddr(vaddr_tainted, tc, aarch64EL, ttbcr); Request::Flags flags = req->getFlags(); bool is_fetch = (mode == Execute); - bool is_write = (mode == Write); + // Cache clean operations require read permissions to the specified VA + bool is_write = !req->isCacheClean() && mode == Write; bool is_priv M5_VAR_USED = isPriv && !(flags & UserMode); updateMiscReg(tc, curTranType); @@ -1528,7 +1544,8 @@ TLB::setTestInterface(SimObject *_ti) Fault TLB::testTranslation(RequestPtr req, Mode mode, TlbEntry::DomainType domain) { - if (!test || !req->hasSize() || req->getSize() == 0) { + if (!test || !req->hasSize() || req->getSize() == 0 || + req->isCacheMaintenance()) { return NoFault; } else { return test->translationCheck(req, isPriv, mode, domain); |