linux-user/arm/target_cpu.h

   1 /*
   2  * ARM specific CPU ABI and functions for linux-user
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   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 ARM_TARGET_CPU_H
  20 #define ARM_TARGET_CPU_H
  21
  22 static inline unsigned long arm_max_reserved_va(CPUState *cs)
  23 {
  24     ARMCPU *cpu = ARM_CPU(cs);
  25
  26     if (arm_feature(&cpu->env, ARM_FEATURE_M)) {
  27         /*
  28          * There are magic return addresses above 0xfe000000,
  29          * and in general a lot of M-profile system stuff in
  30          * the high addresses.  Restrict linux-user to the
  31          * cached write-back RAM in the system map.
  32          */
  33         return 0x80000000ul;
  34     } else {
  35         /*
  36          * We need to be able to map the commpage.
  37          * See validate_guest_space in linux-user/elfload.c.
  38          */
  39         return 0xffff0000ul;
  40     }
  41 }
  42 #define MAX_RESERVED_VA  arm_max_reserved_va
  43
  44 static inline void cpu_clone_regs_child(CPUARMState *env, target_ulong newsp,
  45                                         unsigned flags)
  46 {
  47     if (newsp) {
  48         env->regs[13] = newsp;
  49     }
  50     env->regs[0] = 0;
  51 }
  52
  53 static inline void cpu_clone_regs_parent(CPUARMState *env, unsigned flags)
  54 {
  55 }
  56
  57 static inline void cpu_set_tls(CPUARMState *env, target_ulong newtls)
  58 {
  59     if (access_secure_reg(env)) {
  60         env->cp15.tpidruro_s = newtls;
  61     } else {
  62         env->cp15.tpidrro_el[0] = newtls;
  63     }
  64 }
  65
  66 static inline target_ulong cpu_get_tls(CPUARMState *env)
  67 {
  68     if (access_secure_reg(env)) {
  69         return env->cp15.tpidruro_s;
  70     } else {
  71         return env->cp15.tpidrro_el[0];
  72     }
  73 }
  74
  75 static inline abi_ulong get_sp_from_cpustate(CPUARMState *state)
  76 {
  77    return state->regs[13];
  78 }
  79 #endif