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emulate.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 */

#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm_host.h>

#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/time.h>
#include <asm/byteorder.h>
#include <asm/kvm_ppc.h>

#include "44x_tlb.h"

/* Instruction decoding */
static inline unsigned int get_op(u32 inst)
{
      return inst >> 26;
}

static inline unsigned int get_xop(u32 inst)
{
      return (inst >> 1) & 0x3ff;
}

static inline unsigned int get_sprn(u32 inst)
{
      return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
}

static inline unsigned int get_dcrn(u32 inst)
{
      return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
}

static inline unsigned int get_rt(u32 inst)
{
      return (inst >> 21) & 0x1f;
}

static inline unsigned int get_rs(u32 inst)
{
      return (inst >> 21) & 0x1f;
}

static inline unsigned int get_ra(u32 inst)
{
      return (inst >> 16) & 0x1f;
}

static inline unsigned int get_rb(u32 inst)
{
      return (inst >> 11) & 0x1f;
}

static inline unsigned int get_rc(u32 inst)
{
      return inst & 0x1;
}

static inline unsigned int get_ws(u32 inst)
{
      return (inst >> 11) & 0x1f;
}

static inline unsigned int get_d(u32 inst)
{
      return inst & 0xffff;
}

static int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
                             const struct tlbe *tlbe)
{
      gpa_t gpa;

      if (!get_tlb_v(tlbe))
            return 0;

      /* Does it match current guest AS? */
      /* XXX what about IS != DS? */
      if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS))
            return 0;

      gpa = get_tlb_raddr(tlbe);
      if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
            /* Mapping is not for RAM. */
            return 0;

      return 1;
}

static int kvmppc_emul_tlbwe(struct kvm_vcpu *vcpu, u32 inst)
{
      u64 eaddr;
      u64 raddr;
      u64 asid;
      u32 flags;
      struct tlbe *tlbe;
      unsigned int ra;
      unsigned int rs;
      unsigned int ws;
      unsigned int index;

      ra = get_ra(inst);
      rs = get_rs(inst);
      ws = get_ws(inst);

      index = vcpu->arch.gpr[ra];
      if (index > PPC44x_TLB_SIZE) {
            printk("%s: index %d\n", __func__, index);
            kvmppc_dump_vcpu(vcpu);
            return EMULATE_FAIL;
      }

      tlbe = &vcpu->arch.guest_tlb[index];

      /* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
      if (tlbe->word0 & PPC44x_TLB_VALID) {
            eaddr = get_tlb_eaddr(tlbe);
            asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
            kvmppc_mmu_invalidate(vcpu, eaddr, get_tlb_end(tlbe), asid);
      }

      switch (ws) {
      case PPC44x_TLB_PAGEID:
            tlbe->tid = vcpu->arch.mmucr & 0xff;
            tlbe->word0 = vcpu->arch.gpr[rs];
            break;

      case PPC44x_TLB_XLAT:
            tlbe->word1 = vcpu->arch.gpr[rs];
            break;

      case PPC44x_TLB_ATTRIB:
            tlbe->word2 = vcpu->arch.gpr[rs];
            break;

      default:
            return EMULATE_FAIL;
      }

      if (tlbe_is_host_safe(vcpu, tlbe)) {
            eaddr = get_tlb_eaddr(tlbe);
            raddr = get_tlb_raddr(tlbe);
            asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
            flags = tlbe->word2 & 0xffff;

            /* Create a 4KB mapping on the host. If the guest wanted a
             * large page, only the first 4KB is mapped here and the rest
             * are mapped on the fly. */
            kvmppc_mmu_map(vcpu, eaddr, raddr >> PAGE_SHIFT, asid, flags);
      }

      KVMTRACE_5D(GTLB_WRITE, vcpu, index,
                  tlbe->tid, tlbe->word0, tlbe->word1, tlbe->word2,
                  handler);

      return EMULATE_DONE;
}

static void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
      if (vcpu->arch.tcr & TCR_DIE) {
            /* The decrementer ticks at the same rate as the timebase, so
             * that's how we convert the guest DEC value to the number of
             * host ticks. */
            unsigned long nr_jiffies;

            nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy;
            mod_timer(&vcpu->arch.dec_timer,
                      get_jiffies_64() + nr_jiffies);
      } else {
            del_timer(&vcpu->arch.dec_timer);
      }
}

static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
      vcpu->arch.pc = vcpu->arch.srr0;
      kvmppc_set_msr(vcpu, vcpu->arch.srr1);
}

/* XXX to do:
 * lhax
 * lhaux
 * lswx
 * lswi
 * stswx
 * stswi
 * lha
 * lhau
 * lmw
 * stmw
 *
 * XXX is_bigendian should depend on MMU mapping or MSR[LE]
 */
int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
      u32 inst = vcpu->arch.last_inst;
      u32 ea;
      int ra;
      int rb;
      int rc;
      int rs;
      int rt;
      int sprn;
      int dcrn;
      enum emulation_result emulated = EMULATE_DONE;
      int advance = 1;

      switch (get_op(inst)) {
      case 3:                                                 /* trap */
            printk("trap!\n");
            kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
            advance = 0;
            break;

      case 19:
            switch (get_xop(inst)) {
            case 50:                                        /* rfi */
                  kvmppc_emul_rfi(vcpu);
                  advance = 0;
                  break;

            default:
                  emulated = EMULATE_FAIL;
                  break;
            }
            break;

      case 31:
            switch (get_xop(inst)) {

            case 23:                                        /* lwzx */
                  rt = get_rt(inst);
                  emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
                  break;

            case 83:                                        /* mfmsr */
                  rt = get_rt(inst);
                  vcpu->arch.gpr[rt] = vcpu->arch.msr;
                  break;

            case 87:                                        /* lbzx */
                  rt = get_rt(inst);
                  emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
                  break;

            case 131:                                       /* wrtee */
                  rs = get_rs(inst);
                  vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
                                   | (vcpu->arch.gpr[rs] & MSR_EE);
                  break;

            case 146:                                       /* mtmsr */
                  rs = get_rs(inst);
                  kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
                  break;

            case 151:                                       /* stwx */
                  rs = get_rs(inst);
                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 4, 1);
                  break;

            case 163:                                       /* wrteei */
                  vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
                                   | (inst & MSR_EE);
                  break;

            case 215:                                       /* stbx */
                  rs = get_rs(inst);
                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 1, 1);
                  break;

            case 247:                                       /* stbux */
                  rs = get_rs(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  ea = vcpu->arch.gpr[rb];
                  if (ra)
                        ea += vcpu->arch.gpr[ra];

                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 1, 1);
                  vcpu->arch.gpr[rs] = ea;
                  break;

            case 279:                                       /* lhzx */
                  rt = get_rt(inst);
                  emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
                  break;

            case 311:                                       /* lhzux */
                  rt = get_rt(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  ea = vcpu->arch.gpr[rb];
                  if (ra)
                        ea += vcpu->arch.gpr[ra];

                  emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
                  vcpu->arch.gpr[ra] = ea;
                  break;

            case 323:                                       /* mfdcr */
                  dcrn = get_dcrn(inst);
                  rt = get_rt(inst);

                  /* The guest may access CPR0 registers to determine the timebase
                   * frequency, and it must know the real host frequency because it
                   * can directly access the timebase registers.
                   *
                   * It would be possible to emulate those accesses in userspace,
                   * but userspace can really only figure out the end frequency.
                   * We could decompose that into the factors that compute it, but
                   * that's tricky math, and it's easier to just report the real
                   * CPR0 values.
                   */
                  switch (dcrn) {
                  case DCRN_CPR0_CONFIG_ADDR:
                        vcpu->arch.gpr[rt] = vcpu->arch.cpr0_cfgaddr;
                        break;
                  case DCRN_CPR0_CONFIG_DATA:
                        local_irq_disable();
                        mtdcr(DCRN_CPR0_CONFIG_ADDR,
                              vcpu->arch.cpr0_cfgaddr);
                        vcpu->arch.gpr[rt] = mfdcr(DCRN_CPR0_CONFIG_DATA);
                        local_irq_enable();
                        break;
                  default:
                        run->dcr.dcrn = dcrn;
                        run->dcr.data =  0;
                        run->dcr.is_write = 0;
                        vcpu->arch.io_gpr = rt;
                        vcpu->arch.dcr_needed = 1;
                        emulated = EMULATE_DO_DCR;
                  }

                  break;

            case 339:                                       /* mfspr */
                  sprn = get_sprn(inst);
                  rt = get_rt(inst);

                  switch (sprn) {
                  case SPRN_SRR0:
                        vcpu->arch.gpr[rt] = vcpu->arch.srr0; break;
                  case SPRN_SRR1:
                        vcpu->arch.gpr[rt] = vcpu->arch.srr1; break;
                  case SPRN_MMUCR:
                        vcpu->arch.gpr[rt] = vcpu->arch.mmucr; break;
                  case SPRN_PID:
                        vcpu->arch.gpr[rt] = vcpu->arch.pid; break;
                  case SPRN_IVPR:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivpr; break;
                  case SPRN_CCR0:
                        vcpu->arch.gpr[rt] = vcpu->arch.ccr0; break;
                  case SPRN_CCR1:
                        vcpu->arch.gpr[rt] = vcpu->arch.ccr1; break;
                  case SPRN_PVR:
                        vcpu->arch.gpr[rt] = vcpu->arch.pvr; break;
                  case SPRN_DEAR:
                        vcpu->arch.gpr[rt] = vcpu->arch.dear; break;
                  case SPRN_ESR:
                        vcpu->arch.gpr[rt] = vcpu->arch.esr; break;
                  case SPRN_DBCR0:
                        vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break;
                  case SPRN_DBCR1:
                        vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break;

                  /* Note: mftb and TBRL/TBWL are user-accessible, so
                   * the guest can always access the real TB anyways.
                   * In fact, we probably will never see these traps. */
                  case SPRN_TBWL:
                        vcpu->arch.gpr[rt] = mftbl(); break;
                  case SPRN_TBWU:
                        vcpu->arch.gpr[rt] = mftbu(); break;

                  case SPRN_SPRG0:
                        vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break;
                  case SPRN_SPRG1:
                        vcpu->arch.gpr[rt] = vcpu->arch.sprg1; break;
                  case SPRN_SPRG2:
                        vcpu->arch.gpr[rt] = vcpu->arch.sprg2; break;
                  case SPRN_SPRG3:
                        vcpu->arch.gpr[rt] = vcpu->arch.sprg3; break;
                  /* Note: SPRG4-7 are user-readable, so we don't get
                   * a trap. */

                  case SPRN_IVOR0:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[0]; break;
                  case SPRN_IVOR1:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[1]; break;
                  case SPRN_IVOR2:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[2]; break;
                  case SPRN_IVOR3:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[3]; break;
                  case SPRN_IVOR4:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[4]; break;
                  case SPRN_IVOR5:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[5]; break;
                  case SPRN_IVOR6:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[6]; break;
                  case SPRN_IVOR7:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[7]; break;
                  case SPRN_IVOR8:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[8]; break;
                  case SPRN_IVOR9:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[9]; break;
                  case SPRN_IVOR10:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[10]; break;
                  case SPRN_IVOR11:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[11]; break;
                  case SPRN_IVOR12:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[12]; break;
                  case SPRN_IVOR13:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[13]; break;
                  case SPRN_IVOR14:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[14]; break;
                  case SPRN_IVOR15:
                        vcpu->arch.gpr[rt] = vcpu->arch.ivor[15]; break;

                  default:
                        printk("mfspr: unknown spr %x\n", sprn);
                        vcpu->arch.gpr[rt] = 0;
                        break;
                  }
                  break;

            case 407:                                       /* sthx */
                  rs = get_rs(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 2, 1);
                  break;

            case 439:                                       /* sthux */
                  rs = get_rs(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  ea = vcpu->arch.gpr[rb];
                  if (ra)
                        ea += vcpu->arch.gpr[ra];

                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 2, 1);
                  vcpu->arch.gpr[ra] = ea;
                  break;

            case 451:                                       /* mtdcr */
                  dcrn = get_dcrn(inst);
                  rs = get_rs(inst);

                  /* emulate some access in kernel */
                  switch (dcrn) {
                  case DCRN_CPR0_CONFIG_ADDR:
                        vcpu->arch.cpr0_cfgaddr = vcpu->arch.gpr[rs];
                        break;
                  default:
                        run->dcr.dcrn = dcrn;
                        run->dcr.data = vcpu->arch.gpr[rs];
                        run->dcr.is_write = 1;
                        vcpu->arch.dcr_needed = 1;
                        emulated = EMULATE_DO_DCR;
                  }

                  break;

            case 467:                                       /* mtspr */
                  sprn = get_sprn(inst);
                  rs = get_rs(inst);
                  switch (sprn) {
                  case SPRN_SRR0:
                        vcpu->arch.srr0 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SRR1:
                        vcpu->arch.srr1 = vcpu->arch.gpr[rs]; break;
                  case SPRN_MMUCR:
                        vcpu->arch.mmucr = vcpu->arch.gpr[rs]; break;
                  case SPRN_PID:
                        kvmppc_set_pid(vcpu, vcpu->arch.gpr[rs]); break;
                  case SPRN_CCR0:
                        vcpu->arch.ccr0 = vcpu->arch.gpr[rs]; break;
                  case SPRN_CCR1:
                        vcpu->arch.ccr1 = vcpu->arch.gpr[rs]; break;
                  case SPRN_DEAR:
                        vcpu->arch.dear = vcpu->arch.gpr[rs]; break;
                  case SPRN_ESR:
                        vcpu->arch.esr = vcpu->arch.gpr[rs]; break;
                  case SPRN_DBCR0:
                        vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break;
                  case SPRN_DBCR1:
                        vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break;

                  /* XXX We need to context-switch the timebase for
                   * watchdog and FIT. */
                  case SPRN_TBWL: break;
                  case SPRN_TBWU: break;

                  case SPRN_DEC:
                        vcpu->arch.dec = vcpu->arch.gpr[rs];
                        kvmppc_emulate_dec(vcpu);
                        break;

                  case SPRN_TSR:
                        vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break;

                  case SPRN_TCR:
                        vcpu->arch.tcr = vcpu->arch.gpr[rs];
                        kvmppc_emulate_dec(vcpu);
                        break;

                  case SPRN_SPRG0:
                        vcpu->arch.sprg0 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG1:
                        vcpu->arch.sprg1 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG2:
                        vcpu->arch.sprg2 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG3:
                        vcpu->arch.sprg3 = vcpu->arch.gpr[rs]; break;

                  /* Note: SPRG4-7 are user-readable. These values are
                   * loaded into the real SPRGs when resuming the
                   * guest. */
                  case SPRN_SPRG4:
                        vcpu->arch.sprg4 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG5:
                        vcpu->arch.sprg5 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG6:
                        vcpu->arch.sprg6 = vcpu->arch.gpr[rs]; break;
                  case SPRN_SPRG7:
                        vcpu->arch.sprg7 = vcpu->arch.gpr[rs]; break;

                  case SPRN_IVPR:
                        vcpu->arch.ivpr = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR0:
                        vcpu->arch.ivor[0] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR1:
                        vcpu->arch.ivor[1] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR2:
                        vcpu->arch.ivor[2] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR3:
                        vcpu->arch.ivor[3] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR4:
                        vcpu->arch.ivor[4] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR5:
                        vcpu->arch.ivor[5] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR6:
                        vcpu->arch.ivor[6] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR7:
                        vcpu->arch.ivor[7] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR8:
                        vcpu->arch.ivor[8] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR9:
                        vcpu->arch.ivor[9] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR10:
                        vcpu->arch.ivor[10] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR11:
                        vcpu->arch.ivor[11] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR12:
                        vcpu->arch.ivor[12] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR13:
                        vcpu->arch.ivor[13] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR14:
                        vcpu->arch.ivor[14] = vcpu->arch.gpr[rs]; break;
                  case SPRN_IVOR15:
                        vcpu->arch.ivor[15] = vcpu->arch.gpr[rs]; break;

                  default:
                        printk("mtspr: unknown spr %x\n", sprn);
                        emulated = EMULATE_FAIL;
                        break;
                  }
                  break;

            case 470:                                       /* dcbi */
                  /* Do nothing. The guest is performing dcbi because
                   * hardware DMA is not snooped by the dcache, but
                   * emulated DMA either goes through the dcache as
                   * normal writes, or the host kernel has handled dcache
                   * coherence. */
                  break;

            case 534:                                       /* lwbrx */
                  rt = get_rt(inst);
                  emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
                  break;

            case 566:                                       /* tlbsync */
                  break;

            case 662:                                       /* stwbrx */
                  rs = get_rs(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 4, 0);
                  break;

            case 978:                                       /* tlbwe */
                  emulated = kvmppc_emul_tlbwe(vcpu, inst);
                  break;

            case 914:       {                               /* tlbsx */
                  int index;
                  unsigned int as = get_mmucr_sts(vcpu);
                  unsigned int pid = get_mmucr_stid(vcpu);

                  rt = get_rt(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);
                  rc = get_rc(inst);

                  ea = vcpu->arch.gpr[rb];
                  if (ra)
                        ea += vcpu->arch.gpr[ra];

                  index = kvmppc_44x_tlb_index(vcpu, ea, pid, as);
                  if (rc) {
                        if (index < 0)
                              vcpu->arch.cr &= ~0x20000000;
                        else
                              vcpu->arch.cr |= 0x20000000;
                  }
                  vcpu->arch.gpr[rt] = index;

                  }
                  break;

            case 790:                                       /* lhbrx */
                  rt = get_rt(inst);
                  emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
                  break;

            case 918:                                       /* sthbrx */
                  rs = get_rs(inst);
                  ra = get_ra(inst);
                  rb = get_rb(inst);

                  emulated = kvmppc_handle_store(run, vcpu,
                                                 vcpu->arch.gpr[rs],
                                                 2, 0);
                  break;

            case 966:                                       /* iccci */
                  break;

            default:
                  printk("unknown: op %d xop %d\n", get_op(inst),
                        get_xop(inst));
                  emulated = EMULATE_FAIL;
                  break;
            }
            break;

      case 32:                                                /* lwz */
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
            break;

      case 33:                                                /* lwzu */
            ra = get_ra(inst);
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      case 34:                                                /* lbz */
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
            break;

      case 35:                                                /* lbzu */
            ra = get_ra(inst);
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      case 36:                                                /* stw */
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           4, 1);
            break;

      case 37:                                                /* stwu */
            ra = get_ra(inst);
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           4, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      case 38:                                                /* stb */
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           1, 1);
            break;

      case 39:                                                /* stbu */
            ra = get_ra(inst);
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           1, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      case 40:                                                /* lhz */
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
            break;

      case 41:                                                /* lhzu */
            ra = get_ra(inst);
            rt = get_rt(inst);
            emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      case 44:                                                /* sth */
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           2, 1);
            break;

      case 45:                                                /* sthu */
            ra = get_ra(inst);
            rs = get_rs(inst);
            emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
                                           2, 1);
            vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
            break;

      default:
            printk("unknown op %d\n", get_op(inst));
            emulated = EMULATE_FAIL;
            break;
      }

      KVMTRACE_3D(PPC_INSTR, vcpu, inst, vcpu->arch.pc, emulated, entryexit);

      if (advance)
            vcpu->arch.pc += 4; /* Advance past emulated instruction. */

      return emulated;
}

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