[PATCH 1/6] coverity-model: update address_space_read/write models

[Paolo Bonzini <pbonzini@redhat.com>]

Use void * for consistency with the actual function; provide a model
for MemoryRegionCache functions and for address_space_rw.  These
let Coverity understand the bounds of the data that various functions
read and write even at very high levels of inlining (e.g. pci_dma_read).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 scripts/coverity-scan/model.c | 48 ++++++++++++++++++++++++++++++++---
 1 file changed, 45 insertions(+), 3 deletions(-)

diff --git a/scripts/coverity-scan/model.c b/scripts/coverity-scan/model.c
index 2c0346ff25..e1bdf0ad84 100644
--- a/scripts/coverity-scan/model.c
+++ b/scripts/coverity-scan/model.c
@@ -45,9 +45,10 @@ typedef struct va_list_str *va_list;
 /* exec.c */
 
 typedef struct AddressSpace AddressSpace;
+typedef struct MemoryRegionCache MemoryRegionCache;
 typedef uint64_t hwaddr;
 typedef uint32_t MemTxResult;
-typedef uint64_t MemTxAttrs;
+typedef struct MemTxAttrs {} MemTxAttrs;
 
 static void __bufwrite(uint8_t *buf, ssize_t len)
 {
@@ -67,9 +68,40 @@ static void __bufread(uint8_t *buf, ssize_t len)
     int last = buf[len-1];
 }
 
+MemTxResult address_space_read_cached(MemoryRegionCache *cache, hwaddr addr,
+                                      MemTxAttrs attrs,
+                                      void *buf, int len)
+{
+    MemTxResult result;
+    // TODO: investigate impact of treating reads as producing
+    // tainted data, with __coverity_tainted_data_argument__(buf).
+    __bufwrite(buf, len);
+    return result;
+}
+
+MemTxResult address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
+                                MemTxAttrs attrs,
+                                const void *buf, int len)
+{
+    MemTxResult result;
+    __bufread(buf, len);
+    return result;
+}
+
+MemTxResult address_space_rw_cached(MemoryRegionCache *cache, hwaddr addr,
+                                    MemTxAttrs attrs,
+                                    void *buf, int len, bool is_write)
+{
+    if (is_write) {
+        return address_space_write_cached(cache, addr, attrs, buf, len);
+    } else {
+        return address_space_read_cached(cache, addr, attrs, buf, len);
+    }
+}
+
 MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
                                MemTxAttrs attrs,
-                               uint8_t *buf, int len)
+                               void *buf, int len)
 {
     MemTxResult result;
     // TODO: investigate impact of treating reads as producing
@@ -80,13 +112,23 @@ MemTxResult address_space_read(AddressSpace *as, hwaddr addr,
 
 MemTxResult address_space_write(AddressSpace *as, hwaddr addr,
                                 MemTxAttrs attrs,
-                                const uint8_t *buf, int len)
+                                const void *buf, int len)
 {
     MemTxResult result;
     __bufread(buf, len);
     return result;
 }
 
+MemTxResult address_space_rw(AddressSpace *as, hwaddr addr,
+                             MemTxAttrs attrs,
+                             void *buf, int len, bool is_write)
+{
+    if (is_write) {
+        return address_space_write(as, addr, attrs, buf, len);
+    } else {
+        return address_space_read(as, addr, attrs, buf, len);
+    }
+}
 
 /* Tainting */
 
-- 
2.31.1