LXR qemu/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 "qemu/osdep.h"
  22#include "cpu.h"
  23#include "mmu.h"
  24#include "qemu/host-utils.h"
  25#include "exec/exec-all.h"
  26#include "exec/cpu_ldst.h"
  27
  28
  29//#define CRIS_HELPER_DEBUG
  30
  31
  32#ifdef CRIS_HELPER_DEBUG
  33#define D(x) x
  34#define D_LOG(...) qemu_log(__VA_ARGS__)
  35#else
  36#define D(x)
  37#define D_LOG(...) do { } while (0)
  38#endif
  39
  40#if defined(CONFIG_USER_ONLY)
  41
  42void cris_cpu_do_interrupt(CPUState *cs)
  43{
  44    CRISCPU *cpu = CRIS_CPU(cs);
  45    CPUCRISState *env = &cpu->env;
  46
  47    cs->exception_index = -1;
  48    env->pregs[PR_ERP] = env->pc;
  49}
  50
  51void crisv10_cpu_do_interrupt(CPUState *cs)
  52{
  53    cris_cpu_do_interrupt(cs);
  54}
  55
  56int cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
  57                              int mmu_idx)
  58{
  59    CRISCPU *cpu = CRIS_CPU(cs);
  60
  61    cs->exception_index = 0xaa;
  62    cpu->env.pregs[PR_EDA] = address;
  63    cpu_dump_state(cs, stderr, fprintf, 0);
  64    return 1;
  65}
  66
  67#else /* !CONFIG_USER_ONLY */
  68
  69
  70static void cris_shift_ccs(CPUCRISState *env)
  71{
  72    uint32_t ccs;
  73    /* Apply the ccs shift.  */
  74    ccs = env->pregs[PR_CCS];
  75    ccs = ((ccs & 0xc0000000) | ((ccs << 12) >> 2)) & ~0x3ff;
  76    env->pregs[PR_CCS] = ccs;
  77}
  78
  79int cris_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int rw,
  80                              int mmu_idx)
  81{
  82    CRISCPU *cpu = CRIS_CPU(cs);
  83    CPUCRISState *env = &cpu->env;
  84    struct cris_mmu_result res;
  85    int prot, miss;
  86    int r = -1;
  87    target_ulong phy;
  88
  89    qemu_log_mask(CPU_LOG_MMU, "%s addr=%" VADDR_PRIx " pc=%x rw=%x\n",
  90            __func__, address, env->pc, rw);
  91    miss = cris_mmu_translate(&res, env, address & TARGET_PAGE_MASK,
  92                              rw, mmu_idx, 0);
  93    if (miss) {
  94        if (cs->exception_index == EXCP_BUSFAULT) {
  95            cpu_abort(cs,
  96                      "CRIS: Illegal recursive bus fault."
  97                      "addr=%" VADDR_PRIx " rw=%d\n",
  98                      address, rw);
  99        }
 100
 101        env->pregs[PR_EDA] = address;
 102        cs->exception_index = EXCP_BUSFAULT;
 103        env->fault_vector = res.bf_vec;
 104        r = 1;
 105    } else {
 106        /*
 107         * Mask off the cache selection bit. The ETRAX busses do not
 108         * see the top bit.
 109         */
 110        phy = res.phy & ~0x80000000;
 111        prot = res.prot;
 112        tlb_set_page(cs, address & TARGET_PAGE_MASK, phy,
 113                     prot, mmu_idx, TARGET_PAGE_SIZE);
 114        r = 0;
 115    }
 116    if (r > 0) {
 117        qemu_log_mask(CPU_LOG_MMU,
 118                "%s returns %d irqreq=%x addr=%" VADDR_PRIx " phy=%x vec=%x"
 119                " pc=%x\n", __func__, r, cs->interrupt_request, address,
 120                res.phy, res.bf_vec, env->pc);
 121    }
 122    return r;
 123}
 124
 125void crisv10_cpu_do_interrupt(CPUState *cs)
 126{
 127    CRISCPU *cpu = CRIS_CPU(cs);
 128    CPUCRISState *env = &cpu->env;
 129    int ex_vec = -1;
 130
 131    D_LOG("exception index=%d interrupt_req=%d\n",
 132          cs->exception_index,
 133          cs->interrupt_request);
 134
 135    if (env->dslot) {
 136        /* CRISv10 never takes interrupts while in a delay-slot.  */
 137        cpu_abort(cs, "CRIS: Interrupt on delay-slot\n");
 138    }
 139
 140    assert(!(env->pregs[PR_CCS] & PFIX_FLAG));
 141    switch (cs->exception_index) {
 142    case EXCP_BREAK:
 143        /* These exceptions are genereated by the core itself.
 144           ERP should point to the insn following the brk.  */
 145        ex_vec = env->trap_vector;
 146        env->pregs[PRV10_BRP] = env->pc;
 147        break;
 148
 149    case EXCP_NMI:
 150        /* NMI is hardwired to vector zero.  */
 151        ex_vec = 0;
 152        env->pregs[PR_CCS] &= ~M_FLAG_V10;
 153        env->pregs[PRV10_BRP] = env->pc;
 154        break;
 155
 156    case EXCP_BUSFAULT:
 157        cpu_abort(cs, "Unhandled busfault");
 158        break;
 159
 160    default:
 161        /* The interrupt controller gives us the vector.  */
 162        ex_vec = env->interrupt_vector;
 163        /* Normal interrupts are taken between
 164           TB's.  env->pc is valid here.  */
 165        env->pregs[PR_ERP] = env->pc;
 166        break;
 167    }
 168
 169    if (env->pregs[PR_CCS] & U_FLAG) {
 170        /* Swap stack pointers.  */
 171        env->pregs[PR_USP] = env->regs[R_SP];
 172        env->regs[R_SP] = env->ksp;
 173    }
 174
 175    /* Now that we are in kernel mode, load the handlers address.  */
 176    env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
 177    env->locked_irq = 1;
 178    env->pregs[PR_CCS] |= F_FLAG_V10; /* set F.  */
 179
 180    qemu_log_mask(CPU_LOG_INT, "%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 181                  __func__, env->pc, ex_vec,
 182                  env->pregs[PR_CCS],
 183                  env->pregs[PR_PID],
 184                  env->pregs[PR_ERP]);
 185}
 186
 187void cris_cpu_do_interrupt(CPUState *cs)
 188{
 189    CRISCPU *cpu = CRIS_CPU(cs);
 190    CPUCRISState *env = &cpu->env;
 191    int ex_vec = -1;
 192
 193    D_LOG("exception index=%d interrupt_req=%d\n",
 194          cs->exception_index,
 195          cs->interrupt_request);
 196
 197    switch (cs->exception_index) {
 198    case EXCP_BREAK:
 199        /* These exceptions are genereated by the core itself.
 200           ERP should point to the insn following the brk.  */
 201        ex_vec = env->trap_vector;
 202        env->pregs[PR_ERP] = env->pc;
 203        break;
 204
 205    case EXCP_NMI:
 206        /* NMI is hardwired to vector zero.  */
 207        ex_vec = 0;
 208        env->pregs[PR_CCS] &= ~M_FLAG_V32;
 209        env->pregs[PR_NRP] = env->pc;
 210        break;
 211
 212    case EXCP_BUSFAULT:
 213        ex_vec = env->fault_vector;
 214        env->pregs[PR_ERP] = env->pc;
 215        break;
 216
 217    default:
 218        /* The interrupt controller gives us the vector.  */
 219        ex_vec = env->interrupt_vector;
 220        /* Normal interrupts are taken between
 221           TB's.  env->pc is valid here.  */
 222        env->pregs[PR_ERP] = env->pc;
 223        break;
 224    }
 225
 226    /* Fill in the IDX field.  */
 227    env->pregs[PR_EXS] = (ex_vec & 0xff) << 8;
 228
 229    if (env->dslot) {
 230        D_LOG("excp isr=%x PC=%x ds=%d SP=%x"
 231              " ERP=%x pid=%x ccs=%x cc=%d %x\n",
 232              ex_vec, env->pc, env->dslot,
 233              env->regs[R_SP],
 234              env->pregs[PR_ERP], env->pregs[PR_PID],
 235              env->pregs[PR_CCS],
 236              env->cc_op, env->cc_mask);
 237        /* We loose the btarget, btaken state here so rexec the
 238           branch.  */
 239        env->pregs[PR_ERP] -= env->dslot;
 240        /* Exception starts with dslot cleared.  */
 241        env->dslot = 0;
 242    }
 243        
 244    if (env->pregs[PR_CCS] & U_FLAG) {
 245        /* Swap stack pointers.  */
 246        env->pregs[PR_USP] = env->regs[R_SP];
 247        env->regs[R_SP] = env->ksp;
 248    }
 249
 250    /* Apply the CRIS CCS shift. Clears U if set.  */
 251    cris_shift_ccs(env);
 252
 253    /* Now that we are in kernel mode, load the handlers address.
 254       This load may not fault, real hw leaves that behaviour as
 255       undefined.  */
 256    env->pc = cpu_ldl_code(env, env->pregs[PR_EBP] + ex_vec * 4);
 257
 258    /* Clear the excption_index to avoid spurios hw_aborts for recursive
 259       bus faults.  */
 260    cs->exception_index = -1;
 261
 262    D_LOG("%s isr=%x vec=%x ccs=%x pid=%d erp=%x\n",
 263          __func__, env->pc, ex_vec,
 264          env->pregs[PR_CCS],
 265          env->pregs[PR_PID],
 266          env->pregs[PR_ERP]);
 267}
 268
 269hwaddr cris_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 270{
 271    CRISCPU *cpu = CRIS_CPU(cs);
 272    uint32_t phy = addr;
 273    struct cris_mmu_result res;
 274    int miss;
 275
 276    miss = cris_mmu_translate(&res, &cpu->env, addr, 0, 0, 1);
 277    /* If D TLB misses, try I TLB.  */
 278    if (miss) {
 279        miss = cris_mmu_translate(&res, &cpu->env, addr, 2, 0, 1);
 280    }
 281
 282    if (!miss) {
 283        phy = res.phy;
 284    }
 285    D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 286    return phy;
 287}
 288#endif
 289
 290bool cris_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 291{
 292    CPUClass *cc = CPU_GET_CLASS(cs);
 293    CRISCPU *cpu = CRIS_CPU(cs);
 294    CPUCRISState *env = &cpu->env;
 295    bool ret = false;
 296
 297    if (interrupt_request & CPU_INTERRUPT_HARD
 298        && (env->pregs[PR_CCS] & I_FLAG)
 299        && !env->locked_irq) {
 300        cs->exception_index = EXCP_IRQ;
 301        cc->do_interrupt(cs);
 302        ret = true;
 303    }
 304    if (interrupt_request & CPU_INTERRUPT_NMI) {
 305        unsigned int m_flag_archval;
 306        if (env->pregs[PR_VR] < 32) {
 307            m_flag_archval = M_FLAG_V10;
 308        } else {
 309            m_flag_archval = M_FLAG_V32;
 310        }
 311        if ((env->pregs[PR_CCS] & m_flag_archval)) {
 312            cs->exception_index = EXCP_NMI;
 313            cc->do_interrupt(cs);
 314            ret = true;
 315        }
 316    }
 317
 318    return ret;
 319}
 320