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 "cpu.h"
  22 #include "mmu.h"
  23 #include "qemu/host-utils.h"
  24
  25
  26 //#define CRIS_HELPER_DEBUG
  27
  28
  29 #ifdef CRIS_HELPER_DEBUG
  30 #define D(x) x
  31 #define D_LOG(...) qemu_log(__VA_ARGS__)
  32 #else
  33 #define D(x)
  34 #define D_LOG(...) do { } while (0)
  35 #endif
  36
  37 #if defined(CONFIG_USER_ONLY)
  38
  39 void cris_cpu_do_interrupt(CPUState *cs)
  40 {
  41     CRISCPU *cpu = CRIS_CPU(cs);
  42     CPUCRISState *env = &cpu->env;
  43
  44     env->exception_index = -1;
  45     env->pregs[PR_ERP] = env->pc;
  46 }
  47
  48 void crisv10_cpu_do_interrupt(CPUState *cs)
  49 {
  50     cris_cpu_do_interrupt(cs);
  51 }
  52
  53 int cpu_cris_handle_mmu_fault(CPUCRISState * env, target_ulong address, int rw,
  54                               int mmu_idx)
  55 {
  56     CRISCPU *cpu = cris_env_get_cpu(env);
  57
  58     env->exception_index = 0xaa;
  59     env->pregs[PR_EDA] = address;
  60     cpu_dump_state(CPU(cpu), stderr, fprintf, 0);
  61     return 1;
  62 }
  63
  64 #else /* !CONFIG_USER_ONLY */
  65
  66
  67 static void cris_shift_ccs(CPUCRISState *env)
  68 {
  69     uint32_t ccs;
  70     /* Apply the ccs shift.  */
  71     ccs = env->pregs[PR_CCS];
  72     ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
  73     env->pregs[PR_CCS] = ccs;
  74 }
  75
  76 int cpu_cris_handle_mmu_fault(CPUCRISState *env, target_ulong address, int rw,
  77                               int mmu_idx)
  78 {
  79     D(CPUState *cpu = CPU(cris_env_get_cpu(env)));
  80     struct cris_mmu_result res;
  81     int prot, miss;
  82     int r = -1;
  83     target_ulong phy;
  84
  85     D(printf("%s addr=%x pc=%x rw=%x\n", __func__, address, env->pc, rw));
  86     miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
  87                               rw, mmu_idx, 0);
  88     if (miss) {
  89         if (env->exception_index == EXCP_BUSFAULT) {
  90             cpu_abort(env,
  91                       "CRIS: Illegal recursive bus fault."
  92                       "addr=%x rw=%d\n",
  93                       address, rw);
  94         }
  95
  96         env->pregs[PR_EDA] = address;
  97         env->exception_index = EXCP_BUSFAULT;
  98         env->fault_vector = res.bf_vec;
  99         r = 1;
 100     } else {
 101         /*
 102          * Mask off the cache selection bit. The ETRAX busses do not
 103          * see the top bit.
 104          */
 105         phy = res.phy & ~0x80000000;
 106         prot = res.prot;
 107         tlb_set_page(env, address & TARGET_PAGE_MASK, phy,
 108                      prot, mmu_idx, TARGET_PAGE_SIZE);
 109         r = 0;
 110     }
 111     if (r > 0) {
 112         D_LOG("%s returns %d irqreq=%x addr=%x phy=%x vec=%x pc=%x\n",
 113               __func__, r, cpu->interrupt_request, address, res.phy,
 114               res.bf_vec, env->pc);
 115     }
 116     return r;
 117 }
 118
 119 void crisv10_cpu_do_interrupt(CPUState *cs)
 120 {
 121     CRISCPU *cpu = CRIS_CPU(cs);
 122     CPUCRISState *env = &cpu->env;
 123     int ex_vec = -1;
 124
 125     D_LOG("exception index=%d interrupt_req=%d\n",
 126           env->exception_index,
 127           cs->interrupt_request);
 128
 129     assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
 130     switch (env->exception_index) {
 131     case EXCP_BREAK:
 132         /* These exceptions are genereated by the core itself.
 133            ERP should point to the insn following the brk.  */
 134         ex_vec = env->trap_vector;
 135         env->pregs[PRV10_BRP] = env->pc;
 136         break;
 137
 138     case EXCP_NMI:
 139         /* NMI is hardwired to vector zero.  */
 140         ex_vec = 0;
 141         env->pregs[PR_CCS] &= ~M_FLAG_V10;
 142         env->pregs[PRV10_BRP] = env->pc;
 143         break;
 144
 145     case EXCP_BUSFAULT:
 146         cpu_abort(env, "Unhandled busfault");
 147         break;
 148
 149     default:
 150         /* The interrupt controller gives us the vector.  */
 151         ex_vec = env->interrupt_vector;
 152         /* Normal interrupts are taken between
 153            TB's.  env->pc is valid here.  */
 154         env->pregs[PR_ERP] = env->pc;
 155         break;
 156     }
 157
 158     if (env->pregs[PR_CCS] & U_FLAG) {
 159         /* Swap stack pointers.  */
 160         env->pregs[PR_USP] = env->regs[R_SP];
 161         env->regs[R_SP] = env->ksp;
 162     }
 163
 164     /* Now that we are in kernel mode, load the handlers address.  */
 165     env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
 166     env->locked_irq = 1;
 167     env->pregs[PR_CCS] |= F_FLAG_V10; /* set F.  */
 168
 169     qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 170                   __func__, env->pc, ex_vec,
 171                   env->pregs[PR_CCS],
 172                   env->pregs[PR_PID],
 173                   env->pregs[PR_ERP]);
 174 }
 175
 176 void cris_cpu_do_interrupt(CPUState *cs)
 177 {
 178     CRISCPU *cpu = CRIS_CPU(cs);
 179     CPUCRISState *env = &cpu->env;
 180     int ex_vec = -1;
 181
 182     D_LOG("exception index=%d interrupt_req=%d\n",
 183           env->exception_index,
 184           cs->interrupt_request);
 185
 186     switch (env->exception_index) {
 187     case EXCP_BREAK:
 188         /* These exceptions are genereated by the core itself.
 189            ERP should point to the insn following the brk.  */
 190         ex_vec = env->trap_vector;
 191         env->pregs[PR_ERP] = env->pc;
 192         break;
 193
 194     case EXCP_NMI:
 195         /* NMI is hardwired to vector zero.  */
 196         ex_vec = 0;
 197         env->pregs[PR_CCS] &= ~M_FLAG_V32;
 198         env->pregs[PR_NRP] = env->pc;
 199         break;
 200
 201     case EXCP_BUSFAULT:
 202         ex_vec = env->fault_vector;
 203         env->pregs[PR_ERP] = env->pc;
 204         break;
 205
 206     default:
 207         /* The interrupt controller gives us the vector.  */
 208         ex_vec = env->interrupt_vector;
 209         /* Normal interrupts are taken between
 210            TB's.  env->pc is valid here.  */
 211         env->pregs[PR_ERP] = env->pc;
 212         break;
 213     }
 214
 215     /* Fill in the IDX field.  */
 216     env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;
 217
 218     if (env->dslot) {
 219         D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
 220               " ERP=%x pid=%x ccs=%x cc=%d %x\n",
 221               ex_vec, env->pc, env->dslot,
 222               env->regs[R_SP],
 223               env->pregs[PR_ERP], env->pregs[PR_PID],
 224               env->pregs[PR_CCS],
 225               env->cc_op, env->cc_mask);
 226         /* We loose the btarget, btaken state here so rexec the
 227            branch.  */
 228         env->pregs[PR_ERP] -= env->dslot;
 229         /* Exception starts with dslot cleared.  */
 230         env->dslot = 0;
 231     }
 232
 233     if (env->pregs[PR_CCS] & U_FLAG) {
 234         /* Swap stack pointers.  */
 235         env->pregs[PR_USP] = env->regs[R_SP];
 236         env->regs[R_SP] = env->ksp;
 237     }
 238
 239     /* Apply the CRIS CCS shift. Clears U if set.  */
 240     cris_shift_ccs(env);
 241
 242     /* Now that we are in kernel mode, load the handlers address.
 243        This load may not fault, real hw leaves that behaviour as
 244        undefined.  */
 245     env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
 246
 247     /* Clear the excption_index to avoid spurios hw_aborts for recursive
 248        bus faults.  */
 249     env->exception_index = -1;
 250
 251     D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 252           __func__, env->pc, ex_vec,
 253           env->pregs[PR_CCS],
 254           env->pregs[PR_PID],
 255           env->pregs[PR_ERP]);
 256 }
 257
 258 hwaddr cris_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 259 {
 260     CRISCPU *cpu = CRIS_CPU(cs);
 261     uint32_t phy = addr;
 262     struct cris_mmu_result res;
 263     int miss;
 264
 265     miss = cris_mmu_translate(&res, &cpu->env, addr, 0, 0, 1);
 266     /* If D TLB misses, try I TLB.  */
 267     if (miss) {
 268         miss = cris_mmu_translate(&res, &cpu->env, addr, 2, 0, 1);
 269     }
 270
 271     if (!miss) {
 272         phy = res.phy;
 273     }
 274     D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 275     return phy;
 276 }
 277 #endif