linux-user: Implement cpu_set_tls() and cpu_clone_regs() for AArch64

Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NJohn Rigby <john.rigby@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 1378235544-22290-19-git-send-email-peter.maydell@linaro.org
[PMM: pulled out from another patch; don't use is_a64() here;
 moved to linux-user from target-arm]
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

linux-user/aarch64/target_cpu.h

+/*
+ * ARM AArch64 specific CPU ABI and functions for linux-user
+ *
+ * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
+ *
+ * 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/>.
+ */
+#ifndef TARGET_CPU_H
+#define TARGET_CPU_H
+
+static inline void cpu_clone_regs(CPUARMState *env, target_ulong newsp)
+{
+    if (newsp) {
+        env->xregs[31] = newsp;
+    }
+    env->xregs[0] = 0;
+}
+
+static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
+{
+    env->sr.tpidr_el0 = newtls;
+}
+
+#endif