target-microblaze/helper.c

   1 /*
   2  *  MicroBlaze helper routines.
   3  *
   4  *  Copyright (c) 2009 Edgar E. Iglesias <edgar.iglesias@gmail.com>
   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 #include <stdio.h>
  21 #include <string.h>
  22 #include <assert.h>
  23
  24 #include "config.h"
  25 #include "cpu.h"
  26 #include "host-utils.h"
  27
  28 #define D(x)
  29 #define DMMU(x)
  30
  31 #if defined(CONFIG_USER_ONLY)
  32
  33 void do_interrupt (CPUState *env)
  34 {
  35     env->exception_index = -1;
  36     env->regs[14] = env->sregs[SR_PC];
  37 }
  38
  39 int cpu_mb_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
  40                             int mmu_idx)
  41 {
  42     env->exception_index = 0xaa;
  43     cpu_dump_state(env, stderr, fprintf, 0);
  44     return 1;
  45 }
  46
  47 #else /* !CONFIG_USER_ONLY */
  48
  49 int cpu_mb_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
  50                              int mmu_idx)
  51 {
  52     unsigned int hit;
  53     unsigned int mmu_available;
  54     int r = 1;
  55     int prot;
  56
  57     mmu_available = 0;
  58     if (env->pvr.regs[0] & PVR0_USE_MMU) {
  59         mmu_available = 1;
  60         if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)
  61             && (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
  62             mmu_available = 0;
  63         }
  64     }
  65
  66     /* Translate if the MMU is available and enabled.  */
  67     if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
  68         target_ulong vaddr, paddr;
  69         struct microblaze_mmu_lookup lu;
  70
  71         hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);
  72         if (hit) {
  73             vaddr = address & TARGET_PAGE_MASK;
  74             paddr = lu.paddr + vaddr - lu.vaddr;
  75
  76             DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",
  77                      mmu_idx, vaddr, paddr, lu.prot));
  78             tlb_set_page(env, vaddr, paddr, lu.prot, mmu_idx, TARGET_PAGE_SIZE);
  79             r = 0;
  80         } else {
  81             env->sregs[SR_EAR] = address;
  82             DMMU(qemu_log("mmu=%d miss v=%x\n", mmu_idx, address));
  83
  84             switch (lu.err) {
  85                 case ERR_PROT:
  86                     env->sregs[SR_ESR] = rw == 2 ? 17 : 16;
  87                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  88                     break;
  89                 case ERR_MISS:
  90                     env->sregs[SR_ESR] = rw == 2 ? 19 : 18;
  91                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  92                     break;
  93                 default:
  94                     abort();
  95                     break;
  96             }
  97
  98             if (env->exception_index == EXCP_MMU) {
  99                 cpu_abort(env, "recursive faults\n");
 100             }
 101
 102             /* TLB miss.  */
 103             env->exception_index = EXCP_MMU;
 104         }
 105     } else {
 106         /* MMU disabled or not available.  */
 107         address &= TARGET_PAGE_MASK;
 108         prot = PAGE_BITS;
 109         tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE);
 110         r = 0;
 111     }
 112     return r;
 113 }
 114
 115 void do_interrupt(CPUState *env)
 116 {
 117     uint32_t t;
 118
 119     /* IMM flag cannot propagate across a branch and into the dslot.  */
 120     assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
 121     assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
 122 /*    assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions.  */
 123     switch (env->exception_index) {
 124         case EXCP_HW_EXCP:
 125             if (!(env->pvr.regs[0] & PVR0_USE_EXC_MASK)) {
 126                 qemu_log("Exception raised on system without exceptions!\n");
 127                 return;
 128             }
 129
 130             env->regs[17] = env->sregs[SR_PC] + 4;
 131             env->sregs[SR_ESR] &= ~(1 << 12);
 132
 133             /* Exception breaks branch + dslot sequence?  */
 134             if (env->iflags & D_FLAG) {
 135                 env->sregs[SR_ESR] |= 1 << 12 ;
 136                 env->sregs[SR_BTR] = env->btarget;
 137             }
 138
 139             /* Disable the MMU.  */
 140             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 141             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 142             env->sregs[SR_MSR] |= t;
 143             /* Exception in progress.  */
 144             env->sregs[SR_MSR] |= MSR_EIP;
 145
 146             qemu_log_mask(CPU_LOG_INT,
 147                           "hw exception at pc=%x ear=%x esr=%x iflags=%x\n",
 148                           env->sregs[SR_PC], env->sregs[SR_EAR],
 149                           env->sregs[SR_ESR], env->iflags);
 150             log_cpu_state_mask(CPU_LOG_INT, env, 0);
 151             env->iflags &= ~(IMM_FLAG | D_FLAG);
 152             env->sregs[SR_PC] = 0x20;
 153             break;
 154
 155         case EXCP_MMU:
 156             env->regs[17] = env->sregs[SR_PC];
 157
 158             env->sregs[SR_ESR] &= ~(1 << 12);
 159             /* Exception breaks branch + dslot sequence?  */
 160             if (env->iflags & D_FLAG) {
 161                 D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));
 162                 env->sregs[SR_ESR] |= 1 << 12 ;
 163                 env->sregs[SR_BTR] = env->btarget;
 164
 165                 /* Reexecute the branch.  */
 166                 env->regs[17] -= 4;
 167                 /* was the branch immprefixed?.  */
 168                 if (env->bimm) {
 169                     qemu_log_mask(CPU_LOG_INT,
 170                                   "bimm exception at pc=%x iflags=%x\n",
 171                                   env->sregs[SR_PC], env->iflags);
 172                     env->regs[17] -= 4;
 173                     log_cpu_state_mask(CPU_LOG_INT, env, 0);
 174                 }
 175             } else if (env->iflags & IMM_FLAG) {
 176                 D(qemu_log("IMM_FLAG set at exception\n"));
 177                 env->regs[17] -= 4;
 178             }
 179
 180             /* Disable the MMU.  */
 181             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 182             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 183             env->sregs[SR_MSR] |= t;
 184             /* Exception in progress.  */
 185             env->sregs[SR_MSR] |= MSR_EIP;
 186
 187             qemu_log_mask(CPU_LOG_INT,
 188                           "exception at pc=%x ear=%x iflags=%x\n",
 189                           env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);
 190             log_cpu_state_mask(CPU_LOG_INT, env, 0);
 191             env->iflags &= ~(IMM_FLAG | D_FLAG);
 192             env->sregs[SR_PC] = 0x20;
 193             break;
 194
 195         case EXCP_IRQ:
 196             assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
 197             assert(env->sregs[SR_MSR] & MSR_IE);
 198             assert(!(env->iflags & D_FLAG));
 199
 200             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 201
 202 #if 0
 203 #include "disas.h"
 204
 205 /* Useful instrumentation when debugging interrupt issues in either
 206    the models or in sw.  */
 207             {
 208                 const char *sym;
 209
 210                 sym = lookup_symbol(env->sregs[SR_PC]);
 211                 if (sym
 212                     && (!strcmp("netif_rx", sym)
 213                         || !strcmp("process_backlog", sym))) {
 214
 215                     qemu_log(
 216                          "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
 217                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,
 218                          sym);
 219
 220                     log_cpu_state(env, 0);
 221                 }
 222             }
 223 #endif
 224             qemu_log_mask(CPU_LOG_INT,
 225                          "interrupt at pc=%x msr=%x %x iflags=%x\n",
 226                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 227
 228             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
 229                                     | MSR_UM | MSR_IE);
 230             env->sregs[SR_MSR] |= t;
 231
 232             env->regs[14] = env->sregs[SR_PC];
 233             env->sregs[SR_PC] = 0x10;
 234             //log_cpu_state_mask(CPU_LOG_INT, env, 0);
 235             break;
 236
 237         case EXCP_BREAK:
 238         case EXCP_HW_BREAK:
 239             assert(!(env->iflags & IMM_FLAG));
 240             assert(!(env->iflags & D_FLAG));
 241             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 242             qemu_log_mask(CPU_LOG_INT,
 243                         "break at pc=%x msr=%x %x iflags=%x\n",
 244                         env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 245             log_cpu_state_mask(CPU_LOG_INT, env, 0);
 246             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 247             env->sregs[SR_MSR] |= t;
 248             env->sregs[SR_MSR] |= MSR_BIP;
 249             if (env->exception_index == EXCP_HW_BREAK) {
 250                 env->regs[16] = env->sregs[SR_PC];
 251                 env->sregs[SR_MSR] |= MSR_BIP;
 252                 env->sregs[SR_PC] = 0x18;
 253             } else
 254                 env->sregs[SR_PC] = env->btarget;
 255             break;
 256         default:
 257             cpu_abort(env, "unhandled exception type=%d\n",
 258                       env->exception_index);
 259             break;
 260     }
 261 }
 262
 263 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 264 {
 265     target_ulong vaddr, paddr = 0;
 266     struct microblaze_mmu_lookup lu;
 267     unsigned int hit;
 268
 269     if (env->sregs[SR_MSR] & MSR_VM) {
 270         hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);
 271         if (hit) {
 272             vaddr = addr & TARGET_PAGE_MASK;
 273             paddr = lu.paddr + vaddr - lu.vaddr;
 274         } else
 275             paddr = 0; /* ???.  */
 276     } else
 277         paddr = addr & TARGET_PAGE_MASK;
 278
 279     return paddr;
 280 }
 281 #endif