[RFC PATCH 08/12] exec/memory_ldst_cached: Check address alignment if requested

[Philippe Mathieu-Daudé]

If the caller requires strict alignment, check the address
satisfies it before doing the transaction. Otherwise return
a MEMTX_UNALIGNED_ERROR.

Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
---
 include/exec/memory_ldst_cached.h.inc | 42 +++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/include/exec/memory_ldst_cached.h.inc 
b/include/exec/memory_ldst_cached.h.inc
index 515beb48f47..311a9759a22 100644
--- a/include/exec/memory_ldst_cached.h.inc
+++ b/include/exec/memory_ldst_cached.h.inc
@@ -31,6 +31,13 @@ static inline uint16_t 
ADDRESS_SPACE_LD_CACHED(uw)(MemoryRegionCache *cache,
     assert(addr < cache->len && 2 <= cache->len - addr);
     fuzz_dma_read_cb(cache->xlat + addr, 2, cache->mrs.mr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint16_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return (uint16_t)-1; /* XXX */
+        }
         if (result) {
             *result = MEMTX_OK;
         }
@@ -47,6 +54,13 @@ static inline uint32_t 
ADDRESS_SPACE_LD_CACHED(l)(MemoryRegionCache *cache,
     assert(addr < cache->len && 4 <= cache->len - addr);
     fuzz_dma_read_cb(cache->xlat + addr, 4, cache->mrs.mr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint32_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return (uint32_t)-1; /* XXX */
+        }
         if (result) {
             *result = MEMTX_OK;
         }
@@ -63,6 +77,13 @@ static inline uint64_t 
ADDRESS_SPACE_LD_CACHED(q)(MemoryRegionCache *cache,
     assert(addr < cache->len && 8 <= cache->len - addr);
     fuzz_dma_read_cb(cache->xlat + addr, 8, cache->mrs.mr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint64_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return (uint64_t)-1; /* XXX */
+        }
         if (result) {
             *result = MEMTX_OK;
         }
@@ -89,6 +110,13 @@ static inline void 
ADDRESS_SPACE_ST_CACHED(w)(MemoryRegionCache *cache,
 {
     assert(addr < cache->len && 2 <= cache->len - addr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint16_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return;
+        }
         if (result) {
             *result = MEMTX_OK;
         }
@@ -104,6 +132,13 @@ static inline void 
ADDRESS_SPACE_ST_CACHED(l)(MemoryRegionCache *cache,
 {
     assert(addr < cache->len && 4 <= cache->len - addr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint32_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return;
+        }
         if (result) {
             *result = MEMTX_OK;
         }
@@ -119,6 +154,13 @@ static inline void 
ADDRESS_SPACE_ST_CACHED(q)(MemoryRegionCache *cache,
 {
     assert(addr < cache->len && 8 <= cache->len - addr);
     if (likely(cache->ptr)) {
+        if (attrs.aligned && unlikely(!QEMU_PTR_IS_ALIGNED(cache->ptr,
+                                                           sizeof(uint64_t)))) 
{
+            if (result) {
+                *result = MEMTX_UNALIGNED_ERROR;
+            }
+            return;
+        }
         if (result) {
             *result = MEMTX_OK;
         }
-- 
2.26.3