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 "exec-all.h"
  27 #include "host-utils.h"
  28
  29 #define D(x)
  30 #define DMMU(x)
  31
  32 #if defined(CONFIG_USER_ONLY)
  33
  34 void do_interrupt (CPUState *env)
  35 {
  36     env->exception_index = -1;
  37     env->regs[14] = env->sregs[SR_PC];
  38 }
  39
  40 int cpu_mb_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
  41                              int mmu_idx, int is_softmmu)
  42 {
  43     env->exception_index = 0xaa;
  44     cpu_dump_state(env, stderr, fprintf, 0);
  45     return 1;
  46 }
  47
  48 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
  49 {
  50     return addr;
  51 }
  52
  53 #else /* !CONFIG_USER_ONLY */
  54
  55 int cpu_mb_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
  56                                int mmu_idx, int is_softmmu)
  57 {
  58     unsigned int hit;
  59     unsigned int mmu_available;
  60     int r = 1;
  61     int prot;
  62
  63     mmu_available = 0;
  64     if (env->pvr.regs[0] & PVR0_USE_MMU) {
  65         mmu_available = 1;
  66         if ((env->pvr.regs[0] & PVR0_PVR_FULL_MASK)
  67             && (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
  68             mmu_available = 0;
  69         }
  70     }
  71
  72     /* Translate if the MMU is available and enabled.  */
  73     if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
  74         target_ulong vaddr, paddr;
  75         struct microblaze_mmu_lookup lu;
  76
  77         hit = mmu_translate(&env->mmu, &lu, address, rw, mmu_idx);
  78         if (hit) {
  79             vaddr = address & TARGET_PAGE_MASK;
  80             paddr = lu.paddr + vaddr - lu.vaddr;
  81
  82             DMMU(qemu_log("MMU map mmu=%d v=%x p=%x prot=%x\n",
  83                      mmu_idx, vaddr, paddr, lu.prot));
  84             r = tlb_set_page(env, vaddr,
  85                              paddr, lu.prot, mmu_idx, is_softmmu);
  86         } else {
  87             env->sregs[SR_EAR] = address;
  88             DMMU(qemu_log("mmu=%d miss v=%x\n", mmu_idx, address));
  89
  90             switch (lu.err) {
  91                 case ERR_PROT:
  92                     env->sregs[SR_ESR] = rw == 2 ? 17 : 16;
  93                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  94                     break;
  95                 case ERR_MISS:
  96                     env->sregs[SR_ESR] = rw == 2 ? 19 : 18;
  97                     env->sregs[SR_ESR] |= (rw == 1) << 10;
  98                     break;
  99                 default:
 100                     abort();
 101                     break;
 102             }
 103
 104             if (env->exception_index == EXCP_MMU) {
 105                 cpu_abort(env, "recursive faults\n");
 106             }
 107
 108             /* TLB miss.  */
 109             env->exception_index = EXCP_MMU;
 110         }
 111     } else {
 112         /* MMU disabled or not available.  */
 113         address &= TARGET_PAGE_MASK;
 114         prot = PAGE_BITS;
 115         r = tlb_set_page(env, address, address, prot, mmu_idx, is_softmmu);
 116     }
 117     return r;
 118 }
 119
 120 void do_interrupt(CPUState *env)
 121 {
 122     uint32_t t;
 123
 124     /* IMM flag cannot propagate accross a branch and into the dslot.  */
 125     assert(!((env->iflags & D_FLAG) && (env->iflags & IMM_FLAG)));
 126     assert(!(env->iflags & (DRTI_FLAG | DRTE_FLAG | DRTB_FLAG)));
 127 /*    assert(env->sregs[SR_MSR] & (MSR_EE)); Only for HW exceptions.  */
 128     switch (env->exception_index) {
 129         case EXCP_MMU:
 130             env->regs[17] = env->sregs[SR_PC];
 131
 132             env->sregs[SR_ESR] &= ~(1 << 12);
 133             /* Exception breaks branch + dslot sequence?  */
 134             if (env->iflags & D_FLAG) {
 135                 D(qemu_log("D_FLAG set at exception bimm=%d\n", env->bimm));
 136                 env->sregs[SR_ESR] |= 1 << 12 ;
 137                 env->sregs[SR_BTR] = env->btarget;
 138
 139                 /* Reexecute the branch.  */
 140                 env->regs[17] -= 4;
 141                 /* was the branch immprefixed?.  */
 142                 if (env->bimm) {
 143                     qemu_log_mask(CPU_LOG_INT,
 144                                   "bimm exception at pc=%x iflags=%x\n",
 145                                   env->sregs[SR_PC], env->iflags);
 146                     env->regs[17] -= 4;
 147                     log_cpu_state_mask(CPU_LOG_INT, env, 0);
 148                 }
 149             } else if (env->iflags & IMM_FLAG) {
 150                 D(qemu_log("IMM_FLAG set at exception\n"));
 151                 env->regs[17] -= 4;
 152             }
 153
 154             /* Disable the MMU.  */
 155             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 156             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 157             env->sregs[SR_MSR] |= t;
 158             /* Exception in progress.  */
 159             env->sregs[SR_MSR] |= MSR_EIP;
 160
 161             qemu_log_mask(CPU_LOG_INT,
 162                           "exception at pc=%x ear=%x iflags=%x\n",
 163                           env->sregs[SR_PC], env->sregs[SR_EAR], env->iflags);
 164             log_cpu_state_mask(CPU_LOG_INT, env, 0);
 165             env->iflags &= ~(IMM_FLAG | D_FLAG);
 166             env->sregs[SR_PC] = 0x20;
 167             break;
 168
 169         case EXCP_IRQ:
 170             assert(!(env->sregs[SR_MSR] & (MSR_EIP | MSR_BIP)));
 171             assert(env->sregs[SR_MSR] & MSR_IE);
 172             assert(!(env->iflags & D_FLAG));
 173
 174             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 175
 176 #if 0
 177 #include "disas.h"
 178
 179 /* Useful instrumentation when debugging interrupt issues in either
 180    the models or in sw.  */
 181             {
 182                 const char *sym;
 183
 184                 sym = lookup_symbol(env->sregs[SR_PC]);
 185                 if (sym
 186                     && (!strcmp("netif_rx", sym)
 187                         || !strcmp("process_backlog", sym))) {
 188
 189                     qemu_log(
 190                          "interrupt at pc=%x msr=%x %x iflags=%x sym=%s\n",
 191                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags,
 192                          sym);
 193
 194                     log_cpu_state(env, 0);
 195                 }
 196             }
 197 #endif
 198             qemu_log_mask(CPU_LOG_INT,
 199                          "interrupt at pc=%x msr=%x %x iflags=%x\n",
 200                          env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 201
 202             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM \
 203                                     | MSR_UM | MSR_IE);
 204             env->sregs[SR_MSR] |= t;
 205
 206             env->regs[14] = env->sregs[SR_PC];
 207             env->sregs[SR_PC] = 0x10;
 208             //log_cpu_state_mask(CPU_LOG_INT, env, 0);
 209             break;
 210
 211         case EXCP_BREAK:
 212         case EXCP_HW_BREAK:
 213             assert(!(env->iflags & IMM_FLAG));
 214             assert(!(env->iflags & D_FLAG));
 215             t = (env->sregs[SR_MSR] & (MSR_VM | MSR_UM)) << 1;
 216             qemu_log_mask(CPU_LOG_INT,
 217                         "break at pc=%x msr=%x %x iflags=%x\n",
 218                         env->sregs[SR_PC], env->sregs[SR_MSR], t, env->iflags);
 219             log_cpu_state_mask(CPU_LOG_INT, env, 0);
 220             env->sregs[SR_MSR] &= ~(MSR_VMS | MSR_UMS | MSR_VM | MSR_UM);
 221             env->sregs[SR_MSR] |= t;
 222             env->sregs[SR_MSR] |= MSR_BIP;
 223             if (env->exception_index == EXCP_HW_BREAK) {
 224                 env->regs[16] = env->sregs[SR_PC];
 225                 env->sregs[SR_MSR] |= MSR_BIP;
 226                 env->sregs[SR_PC] = 0x18;
 227             } else
 228                 env->sregs[SR_PC] = env->btarget;
 229             break;
 230         default:
 231             cpu_abort(env, "unhandled exception type=%d\n",
 232                       env->exception_index);
 233             break;
 234     }
 235 }
 236
 237 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 238 {
 239     target_ulong vaddr, paddr = 0;
 240     struct microblaze_mmu_lookup lu;
 241     unsigned int hit;
 242
 243     if (env->sregs[SR_MSR] & MSR_VM) {
 244         hit = mmu_translate(&env->mmu, &lu, addr, 0, 0);
 245         if (hit) {
 246             vaddr = addr & TARGET_PAGE_MASK;
 247             paddr = lu.paddr + vaddr - lu.vaddr;
 248         } else
 249             paddr = 0; /* ???.  */
 250     } else
 251         paddr = addr & TARGET_PAGE_MASK;
 252
 253     return paddr;
 254 }
 255 #endif