target-or32: Add int instruction helpers

Add OpenRISC int instruction helpers.

Signed-off-by: Jia Liu <proljc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/target-openrisc/int_helper.c b/target-openrisc/int_helper.c
new file mode 100644
index 0000000000..2fdfd27712
--- /dev/null
+++ b/target-openrisc/int_helper.c
@@ -0,0 +1,79 @@
+/*
+ * OpenRISC int helper routines
+ *
+ * Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
+ *                         Feng Gao <gf91597@gmail.com>
+ *
+ * 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 "cpu.h"
+#include "helper.h"
+#include "exception.h"
+#include "host-utils.h"
+
+target_ulong HELPER(ff1)(target_ulong x)
+{
+/*#ifdef TARGET_OPENRISC64
+    return x ? ctz64(x) + 1 : 0;
+#else*/
+    return x ? ctz32(x) + 1 : 0;
+/*#endif*/
+}
+
+target_ulong HELPER(fl1)(target_ulong x)
+{
+/* not used yet, open it when we need or64.  */
+/*#ifdef TARGET_OPENRISC64
+    return 64 - clz64(x);
+#else*/
+    return 32 - clz32(x);
+/*#endif*/
+}
+
+uint32_t HELPER(mul32)(CPUOpenRISCState *env,
+                       uint32_t ra, uint32_t rb)
+{
+    uint64_t result;
+    uint32_t high, cy;
+
+    OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
+
+    result = (uint64_t)ra * rb;
+    /* regisiers in or32 is 32bit, so 32 is NOT a magic number.
+       or64 is not handled in this function, and not implement yet,
+       TARGET_LONG_BITS for or64 is 64, it will break this function,
+       so, we didn't use TARGET_LONG_BITS here.  */
+    high = result >> 32;
+    cy = result >> (32 - 1);
+
+    if ((cy & 0x1) == 0x0) {
+        if (high == 0x0) {
+            return result;
+        }
+    }
+
+    if ((cy & 0x1) == 0x1) {
+        if (high == 0xffffffff) {
+            return result;
+        }
+    }
+
+    cpu->env.sr |= (SR_OV | SR_CY);
+    if (cpu->env.sr & SR_OVE) {
+        raise_exception(cpu, EXCP_RANGE);
+    }
+
+    return result;
+}