X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Ftarget-s390x%2Fint_helper.c;fp=qemu%2Ftarget-s390x%2Fint_helper.c;h=a46c736d67bc66388225c60a3059850955d014a7;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/target-s390x/int_helper.c b/qemu/target-s390x/int_helper.c
new file mode 100644
index 000000000..a46c736d6
--- /dev/null
+++ b/qemu/target-s390x/int_helper.c
@@ -0,0 +1,154 @@
+/*
+ *  S/390 integer helper routines
+ *
+ *  Copyright (c) 2009 Ulrich Hecht
+ *  Copyright (c) 2009 Alexander Graf
+ *
+ * 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 "qemu/host-utils.h"
+#include "exec/helper-proto.h"
+
+/* #define DEBUG_HELPER */
+#ifdef DEBUG_HELPER
+#define HELPER_LOG(x...) qemu_log(x)
+#else
+#define HELPER_LOG(x...)
+#endif
+
+/* 64/32 -> 32 signed division */
+int64_t HELPER(divs32)(CPUS390XState *env, int64_t a, int64_t b64)
+{
+    int32_t ret, b = b64;
+    int64_t q;
+
+    if (b == 0) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+
+    ret = q = a / b;
+    env->retxl = a % b;
+
+    /* Catch non-representable quotient.  */
+    if (ret != q) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+
+    return ret;
+}
+
+/* 64/32 -> 32 unsigned division */
+uint64_t HELPER(divu32)(CPUS390XState *env, uint64_t a, uint64_t b64)
+{
+    uint32_t ret, b = b64;
+    uint64_t q;
+
+    if (b == 0) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+
+    ret = q = a / b;
+    env->retxl = a % b;
+
+    /* Catch non-representable quotient.  */
+    if (ret != q) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+
+    return ret;
+}
+
+/* 64/64 -> 64 signed division */
+int64_t HELPER(divs64)(CPUS390XState *env, int64_t a, int64_t b)
+{
+    /* Catch divide by zero, and non-representable quotient (MIN / -1).  */
+    if (b == 0 || (b == -1 && a == (1ll << 63))) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+    env->retxl = a % b;
+    return a / b;
+}
+
+/* 128 -> 64/64 unsigned division */
+uint64_t HELPER(divu64)(CPUS390XState *env, uint64_t ah, uint64_t al,
+                        uint64_t b)
+{
+    uint64_t ret;
+    /* Signal divide by zero.  */
+    if (b == 0) {
+        runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+    }
+    if (ah == 0) {
+        /* 64 -> 64/64 case */
+        env->retxl = al % b;
+        ret = al / b;
+    } else {
+        /* ??? Move i386 idivq helper to host-utils.  */
+#ifdef CONFIG_INT128
+        __uint128_t a = ((__uint128_t)ah << 64) | al;
+        __uint128_t q = a / b;
+        env->retxl = a % b;
+        ret = q;
+        if (ret != q) {
+            runtime_exception(env, PGM_FIXPT_DIVIDE, GETPC());
+        }
+#else
+        S390CPU *cpu = s390_env_get_cpu(env);
+        /* 32-bit hosts would need special wrapper functionality - just abort if
+           we encounter such a case; it's very unlikely anyways. */
+        cpu_abort(CPU(cpu), "128 -> 64/64 division not implemented\n");
+#endif
+    }
+    return ret;
+}
+
+/* count leading zeros, for find leftmost one */
+uint64_t HELPER(clz)(uint64_t v)
+{
+    return clz64(v);
+}
+
+uint64_t HELPER(cvd)(int32_t reg)
+{
+    /* positive 0 */
+    uint64_t dec = 0x0c;
+    int64_t bin = reg;
+    int shift;
+
+    if (bin < 0) {
+        bin = -bin;
+        dec = 0x0d;
+    }
+
+    for (shift = 4; (shift < 64) && bin; shift += 4) {
+        dec |= (bin % 10) << shift;
+        bin /= 10;
+    }
+
+    return dec;
+}
+
+uint64_t HELPER(popcnt)(uint64_t r2)
+{
+    uint64_t ret = 0;
+    int i;
+
+    for (i = 0; i < 64; i += 8) {
+        uint64_t t = ctpop32((r2 >> i) & 0xff);
+        ret |= t << i;
+    }
+    return ret;
+}