File:  [Qemu by Fabrice Bellard] / qemu / target-ppc / helper_regs.h
Revision 1.1.1.4 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 17:40:52 2018 UTC (3 years, 5 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu1101, qemu1001, qemu1000, qemu0151, qemu0150, qemu0141, qemu0140, qemu0130, qemu0125, qemu0124, qemu0123, qemu0122, qemu0121, qemu0120, HEAD
qemu 0.12.0

    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: #if !defined(__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:     /* Precompute MMU index */
   45:     if (msr_pr == 0 && msr_hv != 0) {
   46:         env->mmu_idx = 2;
   47:     } else {
   48:         env->mmu_idx = 1 - msr_pr;
   49:     }
   50: }
   51: 
   52: static inline void hreg_compute_hflags(CPUPPCState *env)
   53: {
   54:     target_ulong hflags_mask;
   55: 
   56:     /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
   57:     hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
   58:         (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
   59:         (1 << MSR_LE);
   60:     hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
   61:     hreg_compute_mem_idx(env);
   62:     env->hflags = env->msr & hflags_mask;
   63:     /* Merge with hflags coming from other registers */
   64:     env->hflags |= env->hflags_nmsr;
   65: }
   66: 
   67: static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
   68:                                  int alter_hv)
   69: {
   70:     int excp;
   71: 
   72:     excp = 0;
   73:     value &= env->msr_mask;
   74: #if !defined (CONFIG_USER_ONLY)
   75:     if (!alter_hv) {
   76:         /* mtmsr cannot alter the hypervisor state */
   77:         value &= ~MSR_HVB;
   78:         value |= env->msr & MSR_HVB;
   79:     }
   80:     if (((value >> MSR_IR) & 1) != msr_ir ||
   81:         ((value >> MSR_DR) & 1) != msr_dr) {
   82:         /* Flush all tlb when changing translation mode */
   83:         tlb_flush(env, 1);
   84:         excp = POWERPC_EXCP_NONE;
   85:         env->interrupt_request |= CPU_INTERRUPT_EXITTB;
   86:     }
   87:     if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
   88:                  ((value ^ env->msr) & (1 << MSR_TGPR)))) {
   89:         /* Swap temporary saved registers with GPRs */
   90:         hreg_swap_gpr_tgpr(env);
   91:     }
   92:     if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
   93:         /* Change the exception prefix on PowerPC 601 */
   94:         env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
   95:     }
   96: #endif
   97:     env->msr = value;
   98:     hreg_compute_hflags(env);
   99: #if !defined (CONFIG_USER_ONLY)
  100:     if (unlikely(msr_pow == 1)) {
  101:         if ((*env->check_pow)(env)) {
  102:             env->halted = 1;
  103:             excp = EXCP_HALTED;
  104:         }
  105:     }
  106: #endif
  107: 
  108:     return excp;
  109: }
  110: 
  111: #endif /* !defined(__HELPER_REGS_H__) */

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