[qemu-s390x] [PATCH v2 23/28] s390x/tcg: MVCIN: Fault-safe handling

[David Hildenbrand]

We can process a maximum of 256 bytes, crossing two pages. Calculate the
accessed range upfront - src is accessed right-to-left.

Signed-off-by: David Hildenbrand <address@hidden>
---
 target/s390x/mem_helper.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c
index 49b4879859..ba8a657e18 100644
--- a/target/s390x/mem_helper.c
+++ b/target/s390x/mem_helper.c
@@ -473,12 +473,20 @@ void HELPER(mvc)(CPUS390XState *env, uint32_t l, uint64_t 
dest, uint64_t src)
 /* move inverse  */
 void HELPER(mvcin)(CPUS390XState *env, uint32_t l, uint64_t dest, uint64_t src)
 {
+    S390Access srca, desta;
     uintptr_t ra = GETPC();
     int i;
 
-    for (i = 0; i <= l; i++) {
-        uint8_t v = cpu_ldub_data_ra(env, src - i, ra);
-        cpu_stb_data_ra(env, dest + i, v, ra);
+    /* MVCIN always copies one more byte than specified - maximum is 256 */
+    l++;
+
+    src = wrap_address(env, src - l + 1);
+    srca = access_prepare(env, src, l, MMU_DATA_LOAD, ra);
+    desta = access_prepare(env, dest, l, MMU_DATA_STORE, ra);
+    for (i = 0; i < l; i++) {
+        const uint8_t x = access_get_byte(env, &srca, l - i - 1, ra);
+
+        access_set_byte(env, &desta, i, x, ra);
     }
 }
 
-- 
2.21.0