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 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 "cpu.h"
  22 #include "qemu/host-utils.h"
  23
  24 #define D(x)
  25 #define DMMU(x)
  26
  27 #if defined(CONFIG_USER_ONLY)
  28
  29 void mb_cpu_do_interrupt(CPUState *cs)
  30 {
  31     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
  32     CPUMBState *env = &cpu->env;
  33
  34     cs->exception_index = -1;
  35     env->res_addr = RES_ADDR_NONE;
  36     env->regs[14] = env->sregs[SR_PC];
  37 }
  38
  39 int mb_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
  40                             int mmu_idx)
  41 {
  42     cs->exception_index = 0xaa;
  43     cpu_dump_state(cs, stderr, fprintf, 0);
  44     return 1;
  45 }
  46
  47 #else /* !CONFIG_USER_ONLY */
  48
  49 int mb_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
  50                             int mmu_idx)
  51 {
  52     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
  53     CPUMBState *env = &cpu->env;
  54     unsigned int hit;
  55     unsigned int mmu_available;
  56     int r = 1;
  57     int prot;
  58
  59     mmu_available = 0;
  60     if (env->pvr.regs[0] & PVR0_USE_MMU) {
  61         mmu_available = 1;
  62         if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)
  63             && (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
  64             mmu_available = 0;
  65         }
  66     }
  67
  68     /* Translate if the MMU is available and enabled.  */
  69     if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
  70         target_ulong vaddr, paddr;
  71         struct microblaze_mmu_lookup lu;
  72
  73         hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);
  74         if (hit) {
  75             vaddr = address & TARGET_PAGE_MASK;
  76             paddr = lu.paddr + vaddr - lu.vaddr;
  77
  78             DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",
  79                      mmu_idx, vaddr, paddr, lu.prot));
  80             tlb_set_page(cs, vaddr, paddr, lu.prot, mmu_idx, TARGET_PAGE_SIZE);
  81             r = 0;
  82         } else {
  83             env->sregs[SR_EAR] = address;
  84             DMMU(qemu_log("mmu=%d miss v=%x\n", mmu_idx, address));
  85
  86             switch (lu.err) {
  87                 case ERR_PROT:
  88                     env->sregs[SR_ESR] = rw == 2 ? 17 : 16;
  89                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  90                     break;
  91                 case ERR_MISS:
  92                     env->sregs[SR_ESR] = rw == 2 ? 19 : 18;
  93                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  94                     break;
  95                 default:
  96                     abort();
  97                     break;
  98             }
  99
 100             if (cs->exception_index == EXCP_MMU) {
 101                 cpu_abort(cs, "recursive faults\n");
 102             }
 103
 104             /* TLB miss.  */
 105             cs->exception_index = EXCP_MMU;
 106         }
 107     } else {
 108         /* MMU disabled or not available.  */
 109         address &= TARGET_PAGE_MASK;
 110         prot = PAGE_BITS;
 111         tlb_set_page(cs, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
 112         r = 0;
 113     }
 114     return r;
 115 }
 116
 117 void mb_cpu_do_interrupt(CPUState *cs)
 118 {
 119     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 120     CPUMBState *env = &cpu->env;
 121     uint32_t t;
 122
 123     /* IMM flag cannot propagate across a branch and into the dslot.  */
 124     assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
 125     assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
 126 /*    assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions.  */
 127     env->res_addr = RES_ADDR_NONE;
 128     switch (cs->exception_index) {
 129         case EXCP_HW_EXCP:
 130             if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
 131                 qemu_log("Exception raised on system without exceptions!\n");
 132                 return;
 133             }
 134
 135             env->regs[17] = env->sregs[SR_PC] + 4;
 136             env->sregs[SR_ESR] &= ~(1 << 12);
 137
 138             /* Exception breaks branch + dslot sequence?  */
 139             if (env->iflags & D_FLAG) {
 140                 env->sregs[SR_ESR] |= 1 << 12 ;
 141                 env->sregs[SR_BTR] = env->btarget;
 142             }
 143
 144             /* Disable the MMU.  */
 145             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 146             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 147             env->sregs[SR_MSR] |= t;
 148             /* Exception in progress.  */
 149             env->sregs[SR_MSR] |= MSR_EIP;
 150
 151             qemu_log_mask(CPU_LOG_INT,
 152                           "hw exception at pc=%x ear=%x esr=%x iflags=%x\n",
 153                           env->sregs[SR_PC], env->sregs[SR_EAR],
 154                           env->sregs[SR_ESR], env->iflags);
 155             log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 156             env->iflags &= ~(IMM_FLAG | D_FLAG);
 157             env->sregs[SR_PC] = cpu->base_vectors + 0x20;
 158             break;
 159
 160         case EXCP_MMU:
 161             env->regs[17] = env->sregs[SR_PC];
 162
 163             env->sregs[SR_ESR] &= ~(1 << 12);
 164             /* Exception breaks branch + dslot sequence?  */
 165             if (env->iflags & D_FLAG) {
 166                 D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));
 167                 env->sregs[SR_ESR] |= 1 << 12 ;
 168                 env->sregs[SR_BTR] = env->btarget;
 169
 170                 /* Reexecute the branch.  */
 171                 env->regs[17] -= 4;
 172                 /* was the branch immprefixed?.  */
 173                 if (env->bimm) {
 174                     qemu_log_mask(CPU_LOG_INT,
 175                                   "bimm exception at pc=%x iflags=%x\n",
 176                                   env->sregs[SR_PC], env->iflags);
 177                     env->regs[17] -= 4;
 178                     log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 179                 }
 180             } else if (env->iflags & IMM_FLAG) {
 181                 D(qemu_log("IMM_FLAG set at exception\n"));
 182                 env->regs[17] -= 4;
 183             }
 184
 185             /* Disable the MMU.  */
 186             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 187             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 188             env->sregs[SR_MSR] |= t;
 189             /* Exception in progress.  */
 190             env->sregs[SR_MSR] |= MSR_EIP;
 191
 192             qemu_log_mask(CPU_LOG_INT,
 193                           "exception at pc=%x ear=%x iflags=%x\n",
 194                           env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);
 195             log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 196             env->iflags &= ~(IMM_FLAG | D_FLAG);
 197             env->sregs[SR_PC] = cpu->base_vectors + 0x20;
 198             break;
 199
 200         case EXCP_IRQ:
 201             assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
 202             assert(env->sregs[SR_MSR] & MSR_IE);
 203             assert(!(env->iflags & D_FLAG));
 204
 205             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 206
 207 #if 0
 208 #include "disas/disas.h"
 209
 210 /* Useful instrumentation when debugging interrupt issues in either
 211    the models or in sw.  */
 212             {
 213                 const char *sym;
 214
 215                 sym = lookup_symbol(env->sregs[SR_PC]);
 216                 if (sym
 217                     && (!strcmp("netif_rx", sym)
 218                         || !strcmp("process_backlog", sym))) {
 219
 220                     qemu_log(
 221                          "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
 222                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,
 223                          sym);
 224
 225                     log_cpu_state(cs, 0);
 226                 }
 227             }
 228 #endif
 229             qemu_log_mask(CPU_LOG_INT,
 230                          "interrupt at pc=%x msr=%x %x iflags=%x\n",
 231                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 232
 233             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
 234                                     | MSR_UM | MSR_IE);
 235             env->sregs[SR_MSR] |= t;
 236
 237             env->regs[14] = env->sregs[SR_PC];
 238             env->sregs[SR_PC] = cpu->base_vectors + 0x10;
 239             //log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 240             break;
 241
 242         case EXCP_BREAK:
 243         case EXCP_HW_BREAK:
 244             assert(!(env->iflags & IMM_FLAG));
 245             assert(!(env->iflags & D_FLAG));
 246             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 247             qemu_log_mask(CPU_LOG_INT,
 248                         "break at pc=%x msr=%x %x iflags=%x\n",
 249                         env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 250             log_cpu_state_mask(CPU_LOG_INT, cs, 0);
 251             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 252             env->sregs[SR_MSR] |= t;
 253             env->sregs[SR_MSR] |= MSR_BIP;
 254             if (cs->exception_index == EXCP_HW_BREAK) {
 255                 env->regs[16] = env->sregs[SR_PC];
 256                 env->sregs[SR_MSR] |= MSR_BIP;
 257                 env->sregs[SR_PC] = cpu->base_vectors + 0x18;
 258             } else
 259                 env->sregs[SR_PC] = env->btarget;
 260             break;
 261         default:
 262             cpu_abort(cs, "unhandled exception type=%d\n",
 263                       cs->exception_index);
 264             break;
 265     }
 266 }
 267
 268 hwaddr mb_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 269 {
 270     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 271     CPUMBState *env = &cpu->env;
 272     target_ulong vaddr, paddr = 0;
 273     struct microblaze_mmu_lookup lu;
 274     unsigned int hit;
 275
 276     if (env->sregs[SR_MSR] & MSR_VM) {
 277         hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);
 278         if (hit) {
 279             vaddr = addr & TARGET_PAGE_MASK;
 280             paddr = lu.paddr + vaddr - lu.vaddr;
 281         } else
 282             paddr = 0; /* ???.  */
 283     } else
 284         paddr = addr & TARGET_PAGE_MASK;
 285
 286     return paddr;
 287 }
 288 #endif
 289
 290 bool mb_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 291 {
 292     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
 293     CPUMBState *env = &cpu->env;
 294
 295     if ((interrupt_request & CPU_INTERRUPT_HARD)
 296         && (env->sregs[SR_MSR] & MSR_IE)
 297         && !(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP))
 298         && !(env->iflags & (D_FLAG | IMM_FLAG))) {
 299         cs->exception_index = EXCP_IRQ;
 300         mb_cpu_do_interrupt(cs);
 301         return true;
 302     }
 303     return false;
 304 }