diff options
Diffstat (limited to 'target-arm/helper.c')
| -rw-r--r-- | target-arm/helper.c | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/target-arm/helper.c b/target-arm/helper.c index 8714724488..b58440b73b 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -6079,6 +6079,28 @@ simple_ap_to_rw_prot(CPUARMState *env, ARMMMUIdx mmu_idx, int ap) return simple_ap_to_rw_prot_is_user(ap, regime_is_user(env, mmu_idx)); } +/* Translate S2 section/page access permissions to protection flags + * + * @env: CPUARMState + * @s2ap: The 2-bit stage2 access permissions (S2AP) + * @xn: XN (execute-never) bit + */ +static int get_S2prot(CPUARMState *env, int s2ap, int xn) +{ + int prot = 0; + + if (s2ap & 1) { + prot |= PAGE_READ; + } + if (s2ap & 2) { + prot |= PAGE_WRITE; + } + if (!xn) { + prot |= PAGE_EXEC; + } + return prot; +} + /* Translate section/page access permissions to protection flags * * @env: CPUARMState @@ -6782,9 +6804,15 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, */ page_size = (1ULL << ((stride * (4 - level)) + 3)); descaddr |= (address & (page_size - 1)); - /* Extract attributes from the descriptor and merge with table attrs */ + /* Extract attributes from the descriptor */ attrs = extract64(descriptor, 2, 10) | (extract64(descriptor, 52, 12) << 10); + + if (mmu_idx == ARMMMUIdx_S2NS) { + /* Stage 2 table descriptors do not include any attribute fields */ + break; + } + /* Merge in attributes from table descriptors */ attrs |= extract32(tableattrs, 0, 2) << 11; /* XN, PXN */ attrs |= extract32(tableattrs, 3, 1) << 5; /* APTable[1] => AP[2] */ /* The sense of AP[1] vs APTable[0] is reversed, as APTable[0] == 1 @@ -6806,11 +6834,16 @@ static bool get_phys_addr_lpae(CPUARMState *env, target_ulong address, } ap = extract32(attrs, 4, 2); - ns = extract32(attrs, 3, 1); xn = extract32(attrs, 12, 1); - pxn = extract32(attrs, 11, 1); - *prot = get_S1prot(env, mmu_idx, va_size == 64, ap, ns, xn, pxn); + if (mmu_idx == ARMMMUIdx_S2NS) { + ns = true; + *prot = get_S2prot(env, ap, xn); + } else { + ns = extract32(attrs, 3, 1); + pxn = extract32(attrs, 11, 1); + *prot = get_S1prot(env, mmu_idx, va_size == 64, ap, ns, xn, pxn); + } fault_type = permission_fault; if (!(*prot & (1 << access_type))) { |