target/microblaze/helper.c

   1 /*
   2  *  MicroBlaze helper routines.
   3  *
   4  *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>
   5  *  Copyright (c) 2009-2012 PetaLogix Qld Pty Ltd.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "cpu.h"
  23 #include "exec/exec-all.h"
  24 #include "qemu/host-utils.h"
  25 #include "exec/log.h"
  26
  27 #ifndef CONFIG_USER_ONLY
  28 static bool mb_cpu_access_is_secure(MicroBlazeCPU *cpu,
  29                                     MMUAccessType access_type)
  30 {
  31     if (access_type == MMU_INST_FETCH) {
  32         return !cpu->ns_axi_ip;
  33     } else {
  34         return !cpu->ns_axi_dp;
  35     }
  36 }
  37
  38 bool mb_cpu_tlb_fill(CPUState *cs, vaddr address, int size,
  39                      MMUAccessType access_type, int mmu_idx,
  40                      bool probe, uintptr_t retaddr)
  41 {
  42     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
  43     CPUMBState *env = &cpu->env;
  44     MicroBlazeMMULookup lu;
  45     unsigned int hit;
  46     int prot;
  47     MemTxAttrs attrs = {};
  48
  49     attrs.secure = mb_cpu_access_is_secure(cpu, access_type);
  50
  51     if (mmu_idx == MMU_NOMMU_IDX) {
  52         /* MMU disabled or not available.  */
  53         address &= TARGET_PAGE_MASK;
  54         prot = PAGE_BITS;
  55         tlb_set_page_with_attrs(cs, address, address, attrs, prot, mmu_idx,
  56                                 TARGET_PAGE_SIZE);
  57         return true;
  58     }
  59
  60     hit = mmu_translate(cpu, &lu, address, access_type, mmu_idx);
  61     if (likely(hit)) {
  62         uint32_t vaddr = address & TARGET_PAGE_MASK;
  63         uint32_t paddr = lu.paddr + vaddr - lu.vaddr;
  64
  65         qemu_log_mask(CPU_LOG_MMU, "MMU map mmu=%d v=%x p=%x prot=%x\n",
  66                       mmu_idx, vaddr, paddr, lu.prot);
  67         tlb_set_page_with_attrs(cs, vaddr, paddr, attrs, lu.prot, mmu_idx,
  68                                 TARGET_PAGE_SIZE);
  69         return true;
  70     }
  71
  72     /* TLB miss.  */
  73     if (probe) {
  74         return false;
  75     }
  76
  77     qemu_log_mask(CPU_LOG_MMU, "mmu=%d miss v=%" VADDR_PRIx "\n",
  78                   mmu_idx, address);
  79
  80     env->ear = address;
  81     switch (lu.err) {
  82     case ERR_PROT:
  83         env->esr = access_type == MMU_INST_FETCH ? 17 : 16;
  84         env->esr |= (access_type == MMU_DATA_STORE) << 10;
  85         break;
  86     case ERR_MISS:
  87         env->esr = access_type == MMU_INST_FETCH ? 19 : 18;
  88         env->esr |= (access_type == MMU_DATA_STORE) << 10;
  89         break;
  90     default:
  91         abort();
  92     }
  93
  94     if (cs->exception_index == EXCP_MMU) {
  95         cpu_abort(cs, "recursive faults\n");
  96     }
  97
  98     /* TLB miss.  */
  99     cs->exception_index = EXCP_MMU;
 100     cpu_loop_exit_restore(cs, retaddr);
 101 }
 102
 103 void mb_cpu_do_interrupt(CPUState *cs)
 104 {
 105     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 106     CPUMBState *env = &cpu->env;
 107     uint32_t t, msr = mb_cpu_read_msr(env);
 108     bool set_esr;
 109
 110     /* IMM flag cannot propagate across a branch and into the dslot.  */
 111     assert((env->iflags & (D_FLAG | IMM_FLAG)) != (D_FLAG | IMM_FLAG));
 112     /* BIMM flag cannot be set without D_FLAG. */
 113     assert((env->iflags & (D_FLAG | BIMM_FLAG)) != BIMM_FLAG);
 114     /* RTI flags are private to translate. */
 115     assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
 116
 117     switch (cs->exception_index) {
 118     case EXCP_HW_EXCP:
 119         if (!(cpu->cfg.pvr_regs[0] & PVR0_USE_EXC_MASK)) {
 120             qemu_log_mask(LOG_GUEST_ERROR,
 121                           "Exception raised on system without exceptions!\n");
 122             return;
 123         }
 124
 125         qemu_log_mask(CPU_LOG_INT,
 126                       "INT: HWE at pc=%08x msr=%08x iflags=%x\n",
 127                       env->pc, msr, env->iflags);
 128
 129         /* Exception breaks branch + dslot sequence?  */
 130         set_esr = true;
 131         env->esr &= ~D_FLAG;
 132         if (env->iflags & D_FLAG) {
 133             env->esr |= D_FLAG;
 134             env->btr = env->btarget;
 135         }
 136
 137         /* Exception in progress. */
 138         msr |= MSR_EIP;
 139         env->regs[17] = env->pc + 4;
 140         env->pc = cpu->cfg.base_vectors + 0x20;
 141         break;
 142
 143     case EXCP_MMU:
 144         qemu_log_mask(CPU_LOG_INT,
 145                       "INT: MMU at pc=%08x msr=%08x "
 146                       "ear=%" PRIx64 " iflags=%x\n",
 147                       env->pc, msr, env->ear, env->iflags);
 148
 149         /* Exception breaks branch + dslot sequence? */
 150         set_esr = true;
 151         env->esr &= ~D_FLAG;
 152         if (env->iflags & D_FLAG) {
 153             env->esr |= D_FLAG;
 154             env->btr = env->btarget;
 155             /* Reexecute the branch. */
 156             env->regs[17] = env->pc - (env->iflags & BIMM_FLAG ? 8 : 4);
 157         } else if (env->iflags & IMM_FLAG) {
 158             /* Reexecute the imm. */
 159             env->regs[17] = env->pc - 4;
 160         } else {
 161             env->regs[17] = env->pc;
 162         }
 163
 164         /* Exception in progress. */
 165         msr |= MSR_EIP;
 166         env->pc = cpu->cfg.base_vectors + 0x20;
 167         break;
 168
 169     case EXCP_IRQ:
 170         assert(!(msr & (MSR_EIP | MSR_BIP)));
 171         assert(msr & MSR_IE);
 172         assert(!(env->iflags & (D_FLAG | IMM_FLAG)));
 173
 174         qemu_log_mask(CPU_LOG_INT,
 175                       "INT: DEV at pc=%08x msr=%08x iflags=%x\n",
 176                       env->pc, msr, env->iflags);
 177         set_esr = false;
 178
 179         /* Disable interrupts.  */
 180         msr &= ~MSR_IE;
 181         env->regs[14] = env->pc;
 182         env->pc = cpu->cfg.base_vectors + 0x10;
 183         break;
 184
 185     case EXCP_HW_BREAK:
 186         assert(!(env->iflags & (D_FLAG | IMM_FLAG)));
 187
 188         qemu_log_mask(CPU_LOG_INT,
 189                       "INT: BRK at pc=%08x msr=%08x iflags=%x\n",
 190                       env->pc, msr, env->iflags);
 191         set_esr = false;
 192
 193         /* Break in progress. */
 194         msr |= MSR_BIP;
 195         env->regs[16] = env->pc;
 196         env->pc = cpu->cfg.base_vectors + 0x18;
 197         break;
 198
 199     default:
 200         cpu_abort(cs, "unhandled exception type=%d\n", cs->exception_index);
 201         /* not reached */
 202     }
 203
 204     /* Save previous mode, disable mmu, disable user-mode. */
 205     t = (msr & (MSR_VM | MSR_UM)) << 1;
 206     msr &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 207     msr |= t;
 208     mb_cpu_write_msr(env, msr);
 209
 210     env->res_addr = RES_ADDR_NONE;
 211     env->iflags = 0;
 212
 213     if (!set_esr) {
 214         qemu_log_mask(CPU_LOG_INT,
 215                       "         to pc=%08x msr=%08x\n", env->pc, msr);
 216     } else if (env->esr & D_FLAG) {
 217         qemu_log_mask(CPU_LOG_INT,
 218                       "         to pc=%08x msr=%08x esr=%04x btr=%08x\n",
 219                       env->pc, msr, env->esr, env->btr);
 220     } else {
 221         qemu_log_mask(CPU_LOG_INT,
 222                       "         to pc=%08x msr=%08x esr=%04x\n",
 223                       env->pc, msr, env->esr);
 224     }
 225 }
 226
 227 hwaddr mb_cpu_get_phys_page_attrs_debug(CPUState *cs, vaddr addr,
 228                                         MemTxAttrs *attrs)
 229 {
 230     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 231     CPUMBState *env = &cpu->env;
 232     target_ulong vaddr, paddr = 0;
 233     MicroBlazeMMULookup lu;
 234     int mmu_idx = cpu_mmu_index(env, false);
 235     unsigned int hit;
 236
 237     /* Caller doesn't initialize */
 238     *attrs = (MemTxAttrs) {};
 239     attrs->secure = mb_cpu_access_is_secure(cpu, MMU_DATA_LOAD);
 240
 241     if (mmu_idx != MMU_NOMMU_IDX) {
 242         hit = mmu_translate(cpu, &lu, addr, 0, 0);
 243         if (hit) {
 244             vaddr = addr & TARGET_PAGE_MASK;
 245             paddr = lu.paddr + vaddr - lu.vaddr;
 246         } else
 247             paddr = 0; /* ???.  */
 248     } else
 249         paddr = addr & TARGET_PAGE_MASK;
 250
 251     return paddr;
 252 }
 253
 254 bool mb_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 255 {
 256     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 257     CPUMBState *env = &cpu->env;
 258
 259     if ((interrupt_request & CPU_INTERRUPT_HARD)
 260         && (env->msr & MSR_IE)
 261         && !(env->msr & (MSR_EIP | MSR_BIP))
 262         && !(env->iflags & (D_FLAG | IMM_FLAG))) {
 263         cs->exception_index = EXCP_IRQ;
 264         mb_cpu_do_interrupt(cs);
 265         return true;
 266     }
 267     return false;
 268 }
 269
 270 #endif /* !CONFIG_USER_ONLY */
 271
 272 void mb_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
 273                                 MMUAccessType access_type,
 274                                 int mmu_idx, uintptr_t retaddr)
 275 {
 276     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 277     uint32_t esr, iflags;
 278
 279     /* Recover the pc and iflags from the corresponding insn_start.  */
 280     cpu_restore_state(cs, retaddr);
 281     iflags = cpu->env.iflags;
 282
 283     qemu_log_mask(CPU_LOG_INT,
 284                   "Unaligned access addr=" TARGET_FMT_lx " pc=%x iflags=%x\n",
 285                   (target_ulong)addr, cpu->env.pc, iflags);
 286
 287     esr = ESR_EC_UNALIGNED_DATA;
 288     if (likely(iflags & ESR_ESS_FLAG)) {
 289         esr |= iflags & ESR_ESS_MASK;
 290     } else {
 291         qemu_log_mask(LOG_UNIMP, "Unaligned access without ESR_ESS_FLAG\n");
 292     }
 293
 294     cpu->env.ear = addr;
 295     cpu->env.esr = esr;
 296     cs->exception_index = EXCP_HW_EXCP;
 297     cpu_loop_exit(cs);
 298 }