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 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_set_tls(CPUARMState *env, target_ulong newtls) 54 { 55 if (access_secure_reg(env)) { 56 env->cp15.tpidruro_s = newtls; 57 } else { 58 env->cp15.tpidrro_el[0] = newtls; 59 } 60 } 61 62 static inline target_ulong cpu_get_tls(CPUARMState *env) 63 { 64 if (access_secure_reg(env)) { 65 return env->cp15.tpidruro_s; 66 } else { 67 return env->cp15.tpidrro_el[0]; 68 } 69 } 70 71 static inline abi_ulong get_sp_from_cpustate(CPUARMState *state) 72 { 73 return state->regs[13]; 74 } 75 #endif 76