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, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24
  25 #include "config.h"
  26 #include "cpu.h"
  27 #include "mmu.h"
  28 #include "exec-all.h"
  29 #include "host-utils.h"
  30
  31 #define D(x)
  32
  33 #if defined(CONFIG_USER_ONLY)
  34
  35 void do_interrupt (CPUState *env)
  36 {
  37         env->exception_index = -1;
  38         env->pregs[PR_ERP] = env->pc;
  39 }
  40
  41 int cpu_cris_handle_mmu_fault(CPUState * env, target_ulong address, int rw,
  42                              int mmu_idx, int is_softmmu)
  43 {
  44         env->exception_index = 0xaa;
  45         env->debug1 = address;
  46         cpu_dump_state(env, stderr, fprintf, 0);
  47         env->pregs[PR_ERP] = env->pc;
  48         return 1;
  49 }
  50
  51 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
  52 {
  53         return addr;
  54 }
  55
  56 #else /* !CONFIG_USER_ONLY */
  57
  58
  59 static void cris_shift_ccs(CPUState *env)
  60 {
  61         uint32_t ccs;
  62         /* Apply the ccs shift.  */
  63         ccs = env->pregs[PR_CCS];
  64         ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2);
  65         env->pregs[PR_CCS] = ccs;
  66 }
  67
  68 int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
  69                                int mmu_idx, int is_softmmu)
  70 {
  71         struct cris_mmu_result_t res;
  72         int prot, miss;
  73         int r = -1;
  74         target_ulong phy;
  75
  76         D(printf ("%s addr=%x pc=%x\n", __func__, address, env->pc));
  77         address &= TARGET_PAGE_MASK;
  78         prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
  79         miss = cris_mmu_translate(&res, env, address, rw, mmu_idx);
  80         if (miss)
  81         {
  82                 env->exception_index = EXCP_MMU_FAULT;
  83                 env->fault_vector = res.bf_vec;
  84                 r = 1;
  85         }
  86         else
  87         {
  88                 phy = res.phy;
  89                 prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
  90                 r = tlb_set_page(env, address, phy, prot, mmu_idx, is_softmmu);
  91         }
  92         D(printf("%s returns %d irqreq=%x addr=%x ismmu=%d\n",
  93                         __func__, r, env->interrupt_request,
  94                         address, is_softmmu));
  95         return r;
  96 }
  97
  98 void do_interrupt(CPUState *env)
  99 {
 100         int ex_vec = -1;
 101
 102         D(fprintf (stderr, "exception index=%d interrupt_req=%d\n",
 103                  env->exception_index,
 104                  env->interrupt_request));
 105
 106         switch (env->exception_index)
 107         {
 108                 case EXCP_BREAK:
 109                         /* These exceptions are genereated by the core itself.
 110                            ERP should point to the insn following the brk.  */
 111                         ex_vec = env->trap_vector;
 112                         env->pregs[PR_ERP] = env->pc + 2;
 113                         break;
 114
 115                 case EXCP_MMU_FAULT:
 116                         /* ERP is already setup by translate-all.c through
 117                            re-translation of the aborted TB combined with
 118                            pc searching.  */
 119                         ex_vec = env->fault_vector;
 120                         break;
 121
 122                 default:
 123                 {
 124                         /* Maybe the irq was acked by sw before we got a
 125                            change to take it.  */
 126                         if (env->interrupt_request & CPU_INTERRUPT_HARD) {
 127                                 /* Vectors below 0x30 are internal
 128                                    exceptions, i.e not interrupt requests
 129                                    from the interrupt controller.  */
 130                                 if (env->interrupt_vector < 0x30)
 131                                         return;
 132                                 /* Is the core accepting interrupts?  */
 133                                 if (!(env->pregs[PR_CCS] & I_FLAG)) {
 134                                         return;
 135                                 }
 136                                 /* The interrupt controller gives us the
 137                                    vector.  */
 138                                 ex_vec = env->interrupt_vector;
 139                                 /* Normal interrupts are taken between
 140                                    TB's.  env->pc is valid here.  */
 141                                 env->pregs[PR_ERP] = env->pc;
 142                         }
 143                 }
 144                 break;
 145         }
 146         env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
 147         /* Apply the CRIS CCS shift.  */
 148         cris_shift_ccs(env);
 149         D(printf ("%s ebp=%x isr=%x vec=%x\n", __func__, ebp, isr, ex_vec));
 150 }
 151
 152 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 153 {
 154         uint32_t phy = addr;
 155         struct cris_mmu_result_t res;
 156         int miss;
 157         miss = cris_mmu_translate(&res, env, addr, 0, 0);
 158         if (!miss)
 159                 phy = res.phy;
 160         D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 161         return phy;
 162 }
 163 #endif