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, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #if !defined(__HELPER_REGS_H__)
  22 #define __HELPER_REGS_H__
  23
  24 static always_inline target_ulong hreg_load_xer (CPUPPCState *env)
  25 {
  26     return (xer_so << XER_SO) |
  27         (xer_ov << XER_OV) |
  28         (xer_ca << XER_CA) |
  29         (xer_bc << XER_BC) |
  30         (xer_cmp << XER_CMP);
  31 }
  32
  33 static always_inline void hreg_store_xer (CPUPPCState *env, target_ulong value)
  34 {
  35     xer_so = (value >> XER_SO) & 0x01;
  36     xer_ov = (value >> XER_OV) & 0x01;
  37     xer_ca = (value >> XER_CA) & 0x01;
  38     xer_cmp = (value >> XER_CMP) & 0xFF;
  39     xer_bc = (value >> XER_BC) & 0x7F;
  40 }
  41
  42 /* Swap temporary saved registers with GPRs */
  43 static always_inline void hreg_swap_gpr_tgpr (CPUPPCState *env)
  44 {
  45     ppc_gpr_t tmp;
  46
  47     tmp = env->gpr[0];
  48     env->gpr[0] = env->tgpr[0];
  49     env->tgpr[0] = tmp;
  50     tmp = env->gpr[1];
  51     env->gpr[1] = env->tgpr[1];
  52     env->tgpr[1] = tmp;
  53     tmp = env->gpr[2];
  54     env->gpr[2] = env->tgpr[2];
  55     env->tgpr[2] = tmp;
  56     tmp = env->gpr[3];
  57     env->gpr[3] = env->tgpr[3];
  58     env->tgpr[3] = tmp;
  59 }
  60
  61 static always_inline void hreg_compute_mem_idx (CPUPPCState *env)
  62 {
  63     /* Precompute MMU index */
  64     if (msr_pr == 0 && msr_hv != 0) {
  65         env->mmu_idx = 2;
  66     } else {
  67         env->mmu_idx = 1 - msr_pr;
  68     }
  69 }
  70
  71 static always_inline void hreg_compute_hflags (CPUPPCState *env)
  72 {
  73     target_ulong hflags_mask;
  74
  75     /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
  76     hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
  77         (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
  78         (1 << MSR_LE);
  79     hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
  80     hreg_compute_mem_idx(env);
  81     env->hflags = env->msr & hflags_mask;
  82     /* Merge with hflags coming from other registers */
  83     env->hflags |= env->hflags_nmsr;
  84 }
  85
  86 static always_inline int hreg_store_msr (CPUPPCState *env, target_ulong value,
  87                                          int alter_hv)
  88 {
  89     int excp;
  90
  91     excp = 0;
  92     value &= env->msr_mask;
  93 #if !defined (CONFIG_USER_ONLY)
  94     if (!alter_hv) {
  95         /* mtmsr cannot alter the hypervisor state */
  96         value &= ~MSR_HVB;
  97         value |= env->msr & MSR_HVB;
  98     }
  99     if (((value >> MSR_IR) & 1) != msr_ir ||
 100         ((value >> MSR_DR) & 1) != msr_dr) {
 101         /* Flush all tlb when changing translation mode */
 102         tlb_flush(env, 1);
 103         excp = POWERPC_EXCP_NONE;
 104         env->interrupt_request |= CPU_INTERRUPT_EXITTB;
 105     }
 106     if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
 107                  ((value ^ env->msr) & (1 << MSR_TGPR)))) {
 108         /* Swap temporary saved registers with GPRs */
 109         hreg_swap_gpr_tgpr(env);
 110     }
 111     if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
 112         /* Change the exception prefix on PowerPC 601 */
 113         env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
 114     }
 115 #endif
 116     env->msr = value;
 117     hreg_compute_hflags(env);
 118 #if !defined (CONFIG_USER_ONLY)
 119     if (unlikely(msr_pow == 1)) {
 120         if ((*env->check_pow)(env)) {
 121             env->halted = 1;
 122             excp = EXCP_HALTED;
 123         }
 124     }
 125 #endif
 126
 127     return excp;
 128 }
 129
 130 #endif /* !defined(__HELPER_REGS_H__) */