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-rw-r--r--target-s390x/cpu.h1
-rw-r--r--target-s390x/mmu_helper.c7
2 files changed, 5 insertions, 3 deletions
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index c0016b69fc..08cdb1529e 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -837,6 +837,7 @@ struct sysib_322 {
#define _ASCE_TABLE_LENGTH 0x03 /* region table length */
#define _REGION_ENTRY_ORIGIN ~0xfffULL /* region/segment table origin */
+#define _REGION_ENTRY_RO 0x200 /* region/segment protection bit */
#define _REGION_ENTRY_TF 0xc0 /* region/segment table offset */
#define _REGION_ENTRY_INV 0x20 /* invalid region table entry */
#define _REGION_ENTRY_TYPE_MASK 0x0c /* region/segment table type mask */
diff --git a/target-s390x/mmu_helper.c b/target-s390x/mmu_helper.c
index 0c53ae92b3..702e8b82cb 100644
--- a/target-s390x/mmu_helper.c
+++ b/target-s390x/mmu_helper.c
@@ -188,9 +188,6 @@ static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr,
return -1;
}
- /* XXX region protection flags */
- /* *flags &= ~PAGE_WRITE */
-
if (level == _ASCE_TYPE_SEGMENT) {
return mmu_translate_segment(env, vaddr, asc, new_entry, raddr, flags,
rw, exc);
@@ -205,6 +202,10 @@ static int mmu_translate_region(CPUS390XState *env, target_ulong vaddr,
return -1;
}
+ if ((env->cregs[0] & CR0_EDAT) && (new_entry & _REGION_ENTRY_RO)) {
+ *flags &= ~PAGE_WRITE;
+ }
+
/* yet another region */
return mmu_translate_region(env, vaddr, asc, new_entry, level - 4,
raddr, flags, rw, exc);