SPARC: Fix ffi019 split load/store of HsInt64 into two parts to respect alignment constraints

1 files changed, 51 insertions, 0 deletions

diff --git a/rts/RtsAPI.c b/rts/RtsAPI.c
index a499d65870..911e703b75 100644
--- a/rts/RtsAPI.c
+++ b/rts/RtsAPI.c
@@ -152,6 +152,31 @@ rts_mkWord32 (Capability *cap, HsWord32 w)
   return p;
 }
 
+
+#ifdef sparc_HOST_ARCH
+/* The closures returned by allocateLocal are only guaranteed to be 32 bit
+   aligned, because that's the size of pointers. SPARC v9 can't do
+   misaligned loads/stores, so we have to write the 64bit word in chunks         */
+
+HaskellObj
+rts_mkWord64 (Capability *cap, HsWord64 w_)
+{
+  StgWord64 w = (StgWord64)w_;
+  StgWord32 *tmp;
+
+  StgClosure *p = (StgClosure *)allocateLocal(cap,CONSTR_sizeW(0,2));
+  /* see mk_Int8 comment */
+  SET_HDR(p, W64zh_con_info, CCS_SYSTEM);
+  
+  tmp    = (StgWord32*)&(p->payload[0]);
+
+  tmp[0] = (StgWord32)((StgWord64)w >> 32);
+  tmp[1] = (StgWord32)w;	/* truncate high 32 bits */
+  return p;
+}
+
+#else
+
 HaskellObj
 rts_mkWord64 (Capability *cap, HsWord64 w)
 {
@@ -165,6 +190,9 @@ rts_mkWord64 (Capability *cap, HsWord64 w)
   return p;
 }
 
+#endif
+
+
 HaskellObj
 rts_mkFloat (Capability *cap, HsFloat f)
 {
@@ -364,6 +392,26 @@ rts_getWord32 (HaskellObj p)
 }
 
 
+#ifdef sparc_HOST_ARCH
+/* The closures returned by allocateLocal are only guaranteed to be 32 bit
+   aligned, because that's the size of pointers. SPARC v9 can't do
+   misaligned loads/stores, so we have to write the 64bit word in chunks         */
+
+HsWord64
+rts_getWord64 (HaskellObj p)
+{
+    HsInt32* tmp;
+    // See comment above:
+    // ASSERT(p->header.info == I64zh_con_info ||
+    //        p->header.info == I64zh_static_info);
+    tmp = (HsInt32*)&(UNTAG_CLOSURE(p)->payload[0]);
+
+    HsInt64 i	= (HsWord64)((HsWord64)(tmp[0]) << 32) | (HsWord64)tmp[1];
+    return i;
+}
+
+#else
+
 HsWord64
 rts_getWord64 (HaskellObj p)
 {
@@ -375,6 +423,9 @@ rts_getWord64 (HaskellObj p)
     return *tmp;
 }
 
+#endif
+
+
 HsFloat
 rts_getFloat (HaskellObj p)
 {