target-cris/helper.c

   1 /*
   2  *  CRIS helper routines.
   3  *
   4  *  Copyright (c) 2007 AXIS Communications AB
   5  *  Written by Edgar E. Iglesias.
   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 <stdio.h>
  22 #include <string.h>
  23
  24 #include "config.h"
  25 #include "cpu.h"
  26 #include "mmu.h"
  27 #include "exec-all.h"
  28 #include "host-utils.h"
  29
  30
  31 //#define CRIS_HELPER_DEBUG
  32
  33
  34 #ifdef CRIS_HELPER_DEBUG
  35 #define D(x) x
  36 #define D_LOG(...) qemu_log(__VA__ARGS__)
  37 #else
  38 #define D(x)
  39 #define D_LOG(...) do { } while (0)
  40 #endif
  41
  42 #if defined(CONFIG_USER_ONLY)
  43
  44 void do_interrupt (CPUState *env)
  45 {
  46         env->exception_index = -1;
  47         env->pregs[PR_ERP] = env->pc;
  48 }
  49
  50 int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
  51                              int mmu_idx, int is_softmmu)
  52 {
  53         env->exception_index = 0xaa;
  54         env->pregs[PR_EDA] = address;
  55         cpu_dump_state(env, stderr, fprintf, 0);
  56         return 1;
  57 }
  58
  59 #else /* !CONFIG_USER_ONLY */
  60
  61
  62 static void cris_shift_ccs(CPUState *env)
  63 {
  64         uint32_t ccs;
  65         /* Apply the ccs shift.  */
  66         ccs = env->pregs[PR_CCS];
  67         ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
  68         env->pregs[PR_CCS] = ccs;
  69 }
  70
  71 int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
  72                                int mmu_idx, int is_softmmu)
  73 {
  74         struct cris_mmu_result res;
  75         int prot, miss;
  76         int r = -1;
  77         target_ulong phy;
  78
  79         D(printf ("%s addr=%x pc=%x rw=%x\n", __func__, address, env->pc, rw));
  80         miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
  81                                   rw, mmu_idx, 0);
  82         if (miss)
  83         {
  84                 if (env->exception_index == EXCP_BUSFAULT)
  85                         cpu_abort(env,
  86                                   "CRIS: Illegal recursive bus fault."
  87                                  "addr=%x rw=%d\n",
  88                                  address, rw);
  89
  90                 env->pregs[PR_EDA] = address;
  91                 env->exception_index = EXCP_BUSFAULT;
  92                 env->fault_vector = res.bf_vec;
  93                 r = 1;
  94         }
  95         else
  96         {
  97                 /*
  98                  * Mask off the cache selection bit. The ETRAX busses do not
  99                  * see the top bit.
 100                  */
 101                 phy = res.phy & ~0x80000000;
 102                 prot = res.prot;
 103                 tlb_set_page(env, address & TARGET_PAGE_MASK, phy,
 104                              prot, mmu_idx, TARGET_PAGE_SIZE);
 105                 r = 0;
 106         }
 107         if (r > 0)
 108                 D_LOG("%s returns %d irqreq=%x addr=%x"
 109                           " phy=%x ismmu=%d vec=%x pc=%x\n",
 110                           __func__, r, env->interrupt_request,
 111                           address, res.phy, is_softmmu, res.bf_vec, env->pc);
 112         return r;
 113 }
 114
 115 static void do_interruptv10(CPUState *env)
 116 {
 117         int ex_vec = -1;
 118
 119         D_LOG( "exception index=%d interrupt_req=%d\n",
 120                    env->exception_index,
 121                    env->interrupt_request);
 122
 123         assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
 124         switch (env->exception_index)
 125         {
 126                 case EXCP_BREAK:
 127                         /* These exceptions are genereated by the core itself.
 128                            ERP should point to the insn following the brk.  */
 129                         ex_vec = env->trap_vector;
 130                         env->pregs[PR_ERP] = env->pc;
 131                         break;
 132
 133                 case EXCP_NMI:
 134                         /* NMI is hardwired to vector zero.  */
 135                         ex_vec = 0;
 136                         env->pregs[PR_CCS] &= ~M_FLAG;
 137                         env->pregs[PR_NRP] = env->pc;
 138                         break;
 139
 140                 case EXCP_BUSFAULT:
 141                         cpu_abort(env, "Unhandled busfault");
 142                         break;
 143
 144                 default:
 145                         /* The interrupt controller gives us the vector.  */
 146                         ex_vec = env->interrupt_vector;
 147                         /* Normal interrupts are taken between
 148                            TB's.  env->pc is valid here.  */
 149                         env->pregs[PR_ERP] = env->pc;
 150                         break;
 151         }
 152
 153         if (env->pregs[PR_CCS] & U_FLAG) {
 154                 /* Swap stack pointers.  */
 155                 env->pregs[PR_USP] = env->regs[R_SP];
 156                 env->regs[R_SP] = env->ksp;
 157         }
 158
 159         /* Now that we are in kernel mode, load the handlers address.  */
 160         env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
 161         env->locked_irq = 1;
 162
 163         qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 164                       __func__, env->pc, ex_vec,
 165                       env->pregs[PR_CCS],
 166                       env->pregs[PR_PID],
 167                       env->pregs[PR_ERP]);
 168 }
 169
 170 void do_interrupt(CPUState *env)
 171 {
 172         int ex_vec = -1;
 173
 174         if (env->pregs[PR_VR] < 32)
 175                 return do_interruptv10(env);
 176
 177         D_LOG( "exception index=%d interrupt_req=%d\n",
 178                    env->exception_index,
 179                    env->interrupt_request);
 180
 181         switch (env->exception_index)
 182         {
 183                 case EXCP_BREAK:
 184                         /* These exceptions are genereated by the core itself.
 185                            ERP should point to the insn following the brk.  */
 186                         ex_vec = env->trap_vector;
 187                         env->pregs[PR_ERP] = env->pc;
 188                         break;
 189
 190                 case EXCP_NMI:
 191                         /* NMI is hardwired to vector zero.  */
 192                         ex_vec = 0;
 193                         env->pregs[PR_CCS] &= ~M_FLAG;
 194                         env->pregs[PR_NRP] = env->pc;
 195                         break;
 196
 197                 case EXCP_BUSFAULT:
 198                         ex_vec = env->fault_vector;
 199                         env->pregs[PR_ERP] = env->pc;
 200                         break;
 201
 202                 default:
 203                         /* The interrupt controller gives us the vector.  */
 204                         ex_vec = env->interrupt_vector;
 205                         /* Normal interrupts are taken between
 206                            TB's.  env->pc is valid here.  */
 207                         env->pregs[PR_ERP] = env->pc;
 208                         break;
 209         }
 210
 211         /* Fill in the IDX field.  */
 212         env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;
 213
 214         if (env->dslot) {
 215                 D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
 216                           " ERP=%x pid=%x ccs=%x cc=%d %x\n",
 217                           ex_vec, env->pc, env->dslot,
 218                           env->regs[R_SP],
 219                           env->pregs[PR_ERP], env->pregs[PR_PID],
 220                           env->pregs[PR_CCS],
 221                           env->cc_op, env->cc_mask);
 222                 /* We loose the btarget, btaken state here so rexec the
 223                    branch.  */
 224                 env->pregs[PR_ERP] -= env->dslot;
 225                 /* Exception starts with dslot cleared.  */
 226                 env->dslot = 0;
 227         }
 228
 229         if (env->pregs[PR_CCS] & U_FLAG) {
 230                 /* Swap stack pointers.  */
 231                 env->pregs[PR_USP] = env->regs[R_SP];
 232                 env->regs[R_SP] = env->ksp;
 233         }
 234
 235         /* Apply the CRIS CCS shift. Clears U if set.  */
 236         cris_shift_ccs(env);
 237
 238         /* Now that we are in kernel mode, load the handlers address.
 239            This load may not fault, real hw leaves that behaviour as
 240            undefined.  */
 241         env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
 242
 243         /* Clear the excption_index to avoid spurios hw_aborts for recursive
 244            bus faults.  */
 245         env->exception_index = -1;
 246
 247         D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 248                    __func__, env->pc, ex_vec,
 249                    env->pregs[PR_CCS],
 250                    env->pregs[PR_PID],
 251                    env->pregs[PR_ERP]);
 252 }
 253
 254 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 255 {
 256         uint32_t phy = addr;
 257         struct cris_mmu_result res;
 258         int miss;
 259
 260         miss = cris_mmu_translate(&res, env, addr, 0, 0, 1);
 261         /* If D TLB misses, try I TLB.  */
 262         if (miss) {
 263                 miss = cris_mmu_translate(&res, env, addr, 2, 0, 1);
 264         }
 265
 266         if (!miss)
 267                 phy = res.phy;
 268         D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 269         return phy;
 270 }
 271 #endif