import Unicorn2

qemu/exec-vary.c

@@ -0,0 +1,69 @@
+/*
+ * Variable page size handling
+ *
+ *  Copyright (c) 2003 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+
+#define IN_EXEC_VARY 1
+
+#include "exec/exec-all.h"
+
+#include <uc_priv.h>
+
+bool set_preferred_target_page_bits(struct uc_struct *uc, int bits)
+{
+    /*
+     * The target page size is the lowest common denominator for all
+     * the CPUs in the system, so we can only make it smaller, never
+     * larger. And we can't make it smaller once we've committed to
+     * a particular size.
+     */
+#ifdef TARGET_PAGE_BITS_VARY
+    assert(bits >= TARGET_PAGE_BITS_MIN);
+    if (uc->init_target_page->bits == 0 || uc->init_target_page->bits > bits) {
+        if (uc->init_target_page->decided) {
+            return false;
+        }
+        uc->init_target_page->bits = bits;
+    }
+#endif
+    return true;
+}
+
+void finalize_target_page_bits(struct uc_struct *uc)
+{
+#ifdef TARGET_PAGE_BITS_VARY
+    if (uc->init_target_page == NULL) {
+        uc->init_target_page = g_new0(TargetPageBits, 1);
+    } else {
+        return;
+    }
+    if (uc->init_target_page->bits == 0) {
+        uc->init_target_page->bits = TARGET_PAGE_BITS_MIN;
+    }
+    uc->init_target_page->mask = (target_long)-1 << uc->init_target_page->bits;
+    uc->init_target_page->decided = true;
+
+    /*
+     * For the benefit of an -flto build, prevent the compiler from
+     * hoisting a read from target_page before we finish initializing.
+     */
+    barrier();
+#endif
+}