Merge pull request #291 from RISCVERS/fix-ram-assert

ram: fix write index checking

src/test/csrc/ram.cpp

@@ -223,8 +223,10 @@ extern "C" uint64_t ram_read_helper(uint8_t en, uint64_t rIdx) {
 
 extern "C" void ram_write_helper(uint64_t wIdx, uint64_t wdata, uint64_t wmask, uint8_t wen) {
   if (wen) {
-    printf("ERROR: ram wIdx = 0x%lx out of bound!\n", wIdx);
-    assert(wIdx < RAMSIZE / sizeof(uint64_t));
+    if (wIdx >= RAMSIZE / sizeof(uint64_t)) {
+      printf("ERROR: ram wIdx = 0x%lx out of bound!\n", wIdx);
+      assert(wIdx < RAMSIZE / sizeof(uint64_t));
+    }
     ram[wIdx] = (ram[wIdx] & ~wmask) | (wdata & wmask);
   }
 }