/* * PowerPC emulation special registers manipulation helpers for qemu. * * Copyright (c) 2003-2007 Jocelyn Mayer * * 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/>. */ #if !defined(__HELPER_REGS_H__) #define __HELPER_REGS_H__ /* Swap temporary saved registers with GPRs */ static inline void hreg_swap_gpr_tgpr(CPUPPCState *env) { target_ulong tmp; tmp = env->gpr[0]; env->gpr[0] = env->tgpr[0]; env->tgpr[0] = tmp; tmp = env->gpr[1]; env->gpr[1] = env->tgpr[1]; env->tgpr[1] = tmp; tmp = env->gpr[2]; env->gpr[2] = env->tgpr[2]; env->tgpr[2] = tmp; tmp = env->gpr[3]; env->gpr[3] = env->tgpr[3]; env->tgpr[3] = tmp; } static inline void hreg_compute_mem_idx(CPUPPCState *env) { /* Precompute MMU index */ if (msr_pr == 0 && msr_hv != 0) { env->mmu_idx = 2; } else { env->mmu_idx = 1 - msr_pr; } } static inline void hreg_compute_hflags(CPUPPCState *env) { target_ulong hflags_mask; /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */ hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) | (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) | (1 << MSR_LE); hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB; hreg_compute_mem_idx(env); env->hflags = env->msr & hflags_mask; /* Merge with hflags coming from other registers */ env->hflags |= env->hflags_nmsr; } static inline int hreg_store_msr(CPUPPCState *env, target_ulong value, int alter_hv) { int excp; #if !defined(CONFIG_USER_ONLY) CPUState *cs = CPU(ppc_env_get_cpu(env)); #endif excp = 0; value &= env->msr_mask; #if !defined(CONFIG_USER_ONLY) if (!alter_hv) { /* mtmsr cannot alter the hypervisor state */ value &= ~MSR_HVB; value |= env->msr & MSR_HVB; } if (((value >> MSR_IR) & 1) != msr_ir || ((value >> MSR_DR) & 1) != msr_dr) { /* Flush all tlb when changing translation mode */ tlb_flush(env, 1); excp = POWERPC_EXCP_NONE; cs->interrupt_request |= CPU_INTERRUPT_EXITTB; } if (unlikely((env->flags & POWERPC_FLAG_TGPR) && ((value ^ env->msr) & (1 << MSR_TGPR)))) { /* Swap temporary saved registers with GPRs */ hreg_swap_gpr_tgpr(env); } if (unlikely((value >> MSR_EP) & 1) != msr_ep) { /* Change the exception prefix on PowerPC 601 */ env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000; } #endif env->msr = value; hreg_compute_hflags(env); #if !defined(CONFIG_USER_ONLY) if (unlikely(msr_pow == 1)) { if ((*env->check_pow)(env)) { cs->halted = 1; excp = EXCP_HALTED; } } #endif return excp; } #endif /* !defined(__HELPER_REGS_H__) */