target-ppc/helper_regs.h

   1 /*
   2  *  PowerPC emulation special registers manipulation helpers for qemu.
   3  *
   4  *  Copyright (c) 2003-2007 Jocelyn Mayer
   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
  20 #ifndef HELPER_REGS_H
  21 #define HELPER_REGS_H
  22
  23 /* Swap temporary saved registers with GPRs */
  24 static inline void hreg_swap_gpr_tgpr(CPUPPCState *env)
  25 {
  26     target_ulong tmp;
  27
  28     tmp = env->gpr[0];
  29     env->gpr[0] = env->tgpr[0];
  30     env->tgpr[0] = tmp;
  31     tmp = env->gpr[1];
  32     env->gpr[1] = env->tgpr[1];
  33     env->tgpr[1] = tmp;
  34     tmp = env->gpr[2];
  35     env->gpr[2] = env->tgpr[2];
  36     env->tgpr[2] = tmp;
  37     tmp = env->gpr[3];
  38     env->gpr[3] = env->tgpr[3];
  39     env->tgpr[3] = tmp;
  40 }
  41
  42 static inline void hreg_compute_mem_idx(CPUPPCState *env)
  43 {
  44     /* This is our encoding for server processors. The architecture
  45      * specifies that there is no such thing as userspace with
  46      * translation off, however it appears that MacOS does it and
  47      * some 32-bit CPUs support it. Weird...
  48      *
  49      *   0 = Guest User space virtual mode
  50      *   1 = Guest Kernel space virtual mode
  51      *   2 = Guest User space real mode
  52      *   3 = Guest Kernel space real mode
  53      *   4 = HV User space virtual mode
  54      *   5 = HV Kernel space virtual mode
  55      *   6 = HV User space real mode
  56      *   7 = HV Kernel space real mode
  57      *
  58      * For BookE, we need 8 MMU modes as follow:
  59      *
  60      *  0 = AS 0 HV User space
  61      *  1 = AS 0 HV Kernel space
  62      *  2 = AS 1 HV User space
  63      *  3 = AS 1 HV Kernel space
  64      *  4 = AS 0 Guest User space
  65      *  5 = AS 0 Guest Kernel space
  66      *  6 = AS 1 Guest User space
  67      *  7 = AS 1 Guest Kernel space
  68      */
  69     if (env->mmu_model & POWERPC_MMU_BOOKE) {
  70         env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
  71         env->immu_idx += msr_is ? 2 : 0;
  72         env->dmmu_idx += msr_ds ? 2 : 0;
  73         env->immu_idx += msr_gs ? 4 : 0;
  74         env->dmmu_idx += msr_gs ? 4 : 0;
  75     } else {
  76         env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
  77         env->immu_idx += msr_ir ? 0 : 2;
  78         env->dmmu_idx += msr_dr ? 0 : 2;
  79         env->immu_idx += msr_hv ? 4 : 0;
  80         env->dmmu_idx += msr_hv ? 4 : 0;
  81     }
  82 }
  83
  84 static inline void hreg_compute_hflags(CPUPPCState *env)
  85 {
  86     target_ulong hflags_mask;
  87
  88     /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
  89     hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
  90         (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
  91         (1 << MSR_LE) | (1 << MSR_VSX) | (1 << MSR_IR) | (1 << MSR_DR);
  92     hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
  93     hreg_compute_mem_idx(env);
  94     env->hflags = env->msr & hflags_mask;
  95     /* Merge with hflags coming from other registers */
  96     env->hflags |= env->hflags_nmsr;
  97 }
  98
  99 static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
 100                                  int alter_hv)
 101 {
 102     int excp;
 103 #if !defined(CONFIG_USER_ONLY)
 104     CPUState *cs = CPU(ppc_env_get_cpu(env));
 105 #endif
 106
 107     excp = 0;
 108     value &= env->msr_mask;
 109 #if !defined(CONFIG_USER_ONLY)
 110     /* Neither mtmsr nor guest state can alter HV */
 111     if (!alter_hv || !(env->msr & MSR_HVB)) {
 112         value &= ~MSR_HVB;
 113         value |= env->msr & MSR_HVB;
 114     }
 115     if (((value >> MSR_IR) & 1) != msr_ir ||
 116         ((value >> MSR_DR) & 1) != msr_dr) {
 117         cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
 118     }
 119     if ((env->mmu_model & POWERPC_MMU_BOOKE) &&
 120         ((value >> MSR_GS) & 1) != msr_gs) {
 121         cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
 122     }
 123     if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
 124                  ((value ^ env->msr) & (1 << MSR_TGPR)))) {
 125         /* Swap temporary saved registers with GPRs */
 126         hreg_swap_gpr_tgpr(env);
 127     }
 128     if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
 129         /* Change the exception prefix on PowerPC 601 */
 130         env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
 131     }
 132     /* If PR=1 then EE, IR and DR must be 1
 133      *
 134      * Note: We only enforce this on 64-bit processors. It appears that
 135      * 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
 136      * exploits it.
 137      */
 138     if ((env->insns_flags & PPC_64B) && ((value >> MSR_PR) & 1)) {
 139         value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
 140     }
 141 #endif
 142     env->msr = value;
 143     hreg_compute_hflags(env);
 144 #if !defined(CONFIG_USER_ONLY)
 145     if (unlikely(msr_pow == 1)) {
 146         if (!env->pending_interrupts && (*env->check_pow)(env)) {
 147             cs->halted = 1;
 148             excp = EXCP_HALTED;
 149         }
 150     }
 151 #endif
 152
 153     return excp;
 154 }
 155
 156 #if !defined(CONFIG_USER_ONLY)
 157 static inline void check_tlb_flush(CPUPPCState *env)
 158 {
 159     CPUState *cs = CPU(ppc_env_get_cpu(env));
 160     if (env->tlb_need_flush) {
 161         env->tlb_need_flush = 0;
 162         tlb_flush(cs, 1);
 163     }
 164 }
 165 #else
 166 static inline void check_tlb_flush(CPUPPCState *env) { }
 167 #endif
 168
 169 #endif /* HELPER_REGS_H */