linux-user/aarch64/target_cpu.h

   1 /*
   2  * ARM AArch64 specific CPU ABI and functions for linux-user
   3  *
   4  * Copyright (c) 2013 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifndef AARCH64_TARGET_CPU_H
  20 #define AARCH64_TARGET_CPU_H
  21
  22 static inline void cpu_clone_regs_child(CPUARMState *env, target_ulong newsp,
  23                                         unsigned flags)
  24 {
  25     if (newsp) {
  26         env->xregs[31] = newsp;
  27     }
  28     env->xregs[0] = 0;
  29 }
  30
  31 static inline void cpu_clone_regs_parent(CPUARMState *env, unsigned flags)
  32 {
  33 }
  34
  35 static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
  36 {
  37     /*
  38      * Note that AArch64 Linux keeps the TLS pointer in TPIDR; this is
  39      * different from AArch32 Linux, which uses TPIDRRO.
  40      */
  41     env->cp15.tpidr_el[0] = newtls;
  42     /* TPIDR2_EL0 is cleared with CLONE_SETTLS. */
  43     env->cp15.tpidr2_el0 = 0;
  44 }
  45
  46 static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
  47 {
  48    return state->xregs[31];
  49 }
  50 #endif