src/cpus/cpu_mips.c

/*
 *  Copyright (C) 2003-2007  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *
 *
 *  $Id: cpu_mips.c,v 1.79 2007/04/28 09:19:51 debug Exp $
 *
 *  MIPS core CPU emulation.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <ctype.h>
#include <unistd.h>

#include "../../config.h"

#include "arcbios.h"
#include "cop0.h"
#include "cpu.h"
#include "cpu_mips.h"
#include "debugger.h"
#include "devices.h"
#include "emul.h"
#include "machine.h"
#include "memory.h"
#include "mips_cpu_types.h"
#include "opcodes_mips.h"
#include "settings.h"
#include "symbol.h"


extern volatile int single_step;

static char *exception_names[] = EXCEPTION_NAMES;

static char *hi6_names[] = HI6_NAMES;
static char *regimm_names[] = REGIMM_NAMES;
static char *special_names[] = SPECIAL_NAMES;
static char *special_rot_names[] = SPECIAL_ROT_NAMES;
static char *special2_names[] = SPECIAL2_NAMES;
static char *mmi_names[] = MMI_NAMES;
static char *mmi0_names[] = MMI0_NAMES;
static char *mmi1_names[] = MMI1_NAMES;
static char *mmi2_names[] = MMI2_NAMES;
static char *mmi3_names[] = MMI3_NAMES;
static char *special3_names[] = SPECIAL3_NAMES;

static char *regnames[] = MIPS_REGISTER_NAMES;
static char *cop0_names[] = COP0_NAMES;


#define DYNTRANS_DUALMODE_32
#define DYNTRANS_DELAYSLOT
#include "tmp_mips_head.c"

void mips_pc_to_pointers(struct cpu *);
void mips32_pc_to_pointers(struct cpu *);


/*
 *  regname():
 *
 *  Convert a register number into either 'r0', 'r31' etc, or a symbolic
 *  name, depending on machine->show_symbolic_register_names.
 *
 *  NOTE: This helper function is _NOT_ reentrant.
 */
static char *regname(struct machine *machine, int r)
{
        static char ch[4];
        ch[3] = ch[2] = '\0';

        if (r<0 || r>=32)
                strlcpy(ch, "xx", sizeof(ch));
        else if (machine->show_symbolic_register_names)
                strlcpy(ch, regnames[r], sizeof(ch));
        else
                snprintf(ch, sizeof(ch), "r%i", r);

        return ch;
}


/*
 *  mips_cpu_new():
 *
 *  Create a new MIPS cpu object.
 *
 *  Returns 1 on success, 0 if there was no valid MIPS processor with
 *  a matching name.
 */
int mips_cpu_new(struct cpu *cpu, struct memory *mem, struct machine *machine,
        int cpu_id, char *cpu_type_name)
{
        int i, found, j, tags_size, n_cache_lines, size_per_cache_line;
        struct mips_cpu_type_def cpu_type_defs[] = MIPS_CPU_TYPE_DEFS;
        int64_t secondary_cache_size;
        int x, linesize;

        /*  Scan the cpu_type_defs list for this cpu type:  */
        i = 0;
        found = -1;
        while (i >= 0 && cpu_type_defs[i].name != NULL) {
                if (strcasecmp(cpu_type_defs[i].name, cpu_type_name) == 0) {
                        found = i;
                        break;
                }
                i++;
        }

        if (found == -1)
                return 0;

        cpu->memory_rw                = mips_memory_rw;
        cpu->cd.mips.cpu_type         = cpu_type_defs[found];
        cpu->name                     = cpu->cd.mips.cpu_type.name;
        cpu->byte_order               = EMUL_LITTLE_ENDIAN;
        cpu->cd.mips.gpr[MIPS_GPR_SP] = INITIAL_STACK_POINTER;

        if (cpu->cd.mips.cpu_type.isa_level <= 2 ||
            cpu->cd.mips.cpu_type.isa_level == 32)
                cpu->is_32bit = 1;

        if (cpu->is_32bit) {
                cpu->run_instr = mips32_run_instr;
                cpu->update_translation_table = mips32_update_translation_table;
                cpu->invalidate_translation_caches =
                    mips32_invalidate_translation_caches;
                cpu->invalidate_code_translation =
                    mips32_invalidate_code_translation;
        } else {
                cpu->run_instr = mips_run_instr;
                cpu->update_translation_table = mips_update_translation_table;
                cpu->invalidate_translation_caches =
                    mips_invalidate_translation_caches;
                cpu->invalidate_code_translation =
                    mips_invalidate_code_translation;
        }

        cpu->instruction_has_delayslot = mips_cpu_instruction_has_delayslot;

        if (cpu_id == 0)
                debug("%s", cpu->cd.mips.cpu_type.name);

        /*
         *  CACHES:
         *
         *  1) Use DEFAULT_PCACHE_SIZE and DEFAULT_PCACHE_LINESIZE etc.
         *  2) If there are specific values defined for this type of cpu,
         *     in its cpu_type substruct, then let's use those.
         *  3) Values in the emul struct override both of the above.
         *
         *  Once we've decided which values to use, they are stored in
         *  the emul struct so they can be used from src/machine.c etc.
         */

        x = DEFAULT_PCACHE_SIZE;
        if (cpu->cd.mips.cpu_type.pdcache)
                x = cpu->cd.mips.cpu_type.pdcache;
        if (machine->cache_pdcache == 0)
                machine->cache_pdcache = x;

        x = DEFAULT_PCACHE_SIZE;
        if (cpu->cd.mips.cpu_type.picache)
                x = cpu->cd.mips.cpu_type.picache;
        if (machine->cache_picache == 0)
                machine->cache_picache = x;

        if (machine->cache_secondary == 0)
                machine->cache_secondary = cpu->cd.mips.cpu_type.scache;

        linesize = DEFAULT_PCACHE_LINESIZE;
        if (cpu->cd.mips.cpu_type.pdlinesize)
                linesize = cpu->cd.mips.cpu_type.pdlinesize;
        if (machine->cache_pdcache_linesize == 0)
                machine->cache_pdcache_linesize = linesize;

        linesize = DEFAULT_PCACHE_LINESIZE;
        if (cpu->cd.mips.cpu_type.pilinesize)
                linesize = cpu->cd.mips.cpu_type.pilinesize;
        if (machine->cache_picache_linesize == 0)
                machine->cache_picache_linesize = linesize;

        linesize = 0;
        if (cpu->cd.mips.cpu_type.slinesize)
                linesize = cpu->cd.mips.cpu_type.slinesize;
        if (machine->cache_secondary_linesize == 0)
                machine->cache_secondary_linesize = linesize;


        /*
         *  Primary Data and Instruction caches:
         */
        for (i=CACHE_DATA; i<=CACHE_INSTRUCTION; i++) {
                switch (i) {
                case CACHE_DATA:
                        x = 1 << machine->cache_pdcache;
                        linesize = 1 << machine->cache_pdcache_linesize;
                        break;
                case CACHE_INSTRUCTION:
                        x = 1 << machine->cache_picache;
                        linesize = 1 << machine->cache_picache_linesize;
                        break;
                }

                /*  Primary cache size and linesize:  */
                cpu->cd.mips.cache_size[i] = x;
                cpu->cd.mips.cache_linesize[i] = linesize;

                switch (cpu->cd.mips.cpu_type.rev) {
                case MIPS_R2000:
                case MIPS_R3000:
                        size_per_cache_line = sizeof(struct r3000_cache_line);
                        break;
                default:
                        size_per_cache_line = sizeof(struct r4000_cache_line);
                }

                cpu->cd.mips.cache_mask[i] = cpu->cd.mips.cache_size[i] - 1;
                cpu->cd.mips.cache_miss_penalty[i] = 10;        /*  TODO ?  */

                cpu->cd.mips.cache[i] = malloc(cpu->cd.mips.cache_size[i]);
                if (cpu->cd.mips.cache[i] == NULL) {
                        fprintf(stderr, "out of memory\n");
                }

                n_cache_lines = cpu->cd.mips.cache_size[i] /
                    cpu->cd.mips.cache_linesize[i];
                tags_size = n_cache_lines * size_per_cache_line;

                cpu->cd.mips.cache_tags[i] = malloc(tags_size);
                if (cpu->cd.mips.cache_tags[i] == NULL) {
                        fprintf(stderr, "out of memory\n");
                }

                /*  Initialize the cache tags:  */
                switch (cpu->cd.mips.cpu_type.rev) {
                case MIPS_R2000:
                case MIPS_R3000:
                        for (j=0; j<n_cache_lines; j++) {
                                struct r3000_cache_line *rp;
                                rp = (struct r3000_cache_line *)
                                    cpu->cd.mips.cache_tags[i];
                                rp[j].tag_paddr = 0;
                                rp[j].tag_valid = 0;
                        }
                        break;
                default:
                        ;
                }

                /*  Set cache_last_paddr to something "impossible":  */
                cpu->cd.mips.cache_last_paddr[i] = IMPOSSIBLE_PADDR;
        }

        /*
         *  Secondary cache:
         */
        secondary_cache_size = 0;
        if (machine->cache_secondary)
                secondary_cache_size = 1 << machine->cache_secondary;
        /*  TODO: linesize...  */

        if (cpu_id == 0) {
                debug(" (I+D = %i+%i KB",
                    (int)(cpu->cd.mips.cache_size[CACHE_INSTRUCTION] / 1024),
                    (int)(cpu->cd.mips.cache_size[CACHE_DATA] / 1024));

                if (secondary_cache_size != 0) {
                        debug(", L2 = ");
                        if (secondary_cache_size >= 1048576)
                                debug("%i MB", (int)
                                    (secondary_cache_size / 1048576));
                        else
                                debug("%i KB", (int)
                                    (secondary_cache_size / 1024));
                }

                debug(")");
        }

        /*  Register the CPU's interrupts:  */
        for (i=2; i<8; i++) {
                struct interrupt template;
                char name[50];
                snprintf(name, sizeof(name), "%s.%i", cpu->path, i);
                memset(&template, 0, sizeof(template));
                template.line = 1 << (STATUS_IM_SHIFT + i);
                template.name = name;
                template.extra = cpu;
                template.interrupt_assert = mips_cpu_interrupt_assert;
                template.interrupt_deassert = mips_cpu_interrupt_deassert;
                interrupt_handler_register(&template);

                if (i == 7)
                        INTERRUPT_CONNECT(name, cpu->cd.mips.irq_compare);
        }

        /*  System coprocessor (0), and FPU (1):  */
        cpu->cd.mips.coproc[0] = mips_coproc_new(cpu, 0);
        cpu->cd.mips.coproc[1] = mips_coproc_new(cpu, 1);

        switch (cpu->cd.mips.cpu_type.mmu_model) {
        case MMU3K:
                cpu->translate_v2p = translate_v2p_mmu3k;
                break;
        case MMU8K:
                cpu->translate_v2p = translate_v2p_mmu8k;
                break;
        case MMU10K:
                cpu->translate_v2p = translate_v2p_mmu10k;
                break;
        default:
                if (cpu->cd.mips.cpu_type.rev == MIPS_R4100)
                        cpu->translate_v2p = translate_v2p_mmu4100;
                else
                        cpu->translate_v2p = translate_v2p_generic;
        }

        if (cpu->machine->prom_emulation) {
                /*
                 *  Default behaviour of jumping to 0xbfc00000 should be
                 *  a reboot, unless machine-specific initialization code
                 *  overrides this.
                 *
                 *  Note: Specifically big-endian machines should override
                 *  this, since the default MIPS CPU is little-endian!
                 */
                store_32bit_word(cpu, 0xffffffff9fc00000ULL, 0x00c0de0d);
        }

        /*  Add all register names to the settings:  */
        CPU_SETTINGS_ADD_REGISTER64("pc", cpu->pc);
        CPU_SETTINGS_ADD_REGISTER64("hi", cpu->cd.mips.hi);
        CPU_SETTINGS_ADD_REGISTER64("lo", cpu->cd.mips.lo);
        for (i=0; i<N_MIPS_GPRS; i++)
                CPU_SETTINGS_ADD_REGISTER64(regnames[i], cpu->cd.mips.gpr[i]);
        /*  TODO: Write via special handler function!  */
        for (i=0; i<N_MIPS_COPROC_REGS; i++)
                CPU_SETTINGS_ADD_REGISTER64(cop0_names[i],
                    cpu->cd.mips.coproc[0]->reg[i]);

        return 1;
}


/*
 *  mips_cpu_dumpinfo():
 *
 *  Debug dump of MIPS-specific CPU data for specific CPU.
 */
void mips_cpu_dumpinfo(struct cpu *cpu)
{
        int iadd = DEBUG_INDENTATION;
        struct mips_cpu_type_def *ct = &cpu->cd.mips.cpu_type;

        debug_indentation(iadd);

        debug("\n%i-bit %s-endian (MIPS",
            cpu->is_32bit? 32 : 64,
            cpu->byte_order == EMUL_BIG_ENDIAN? "Big" : "Little");

        switch (ct->isa_level) {
        case 1: debug(" ISA I"); break;
        case 2: debug(" ISA II"); break;
        case 3: debug(" ISA III"); break;
        case 4: debug(" ISA IV"); break;
        case 5: debug(" ISA V"); break;
        case 32:
        case 64:debug("%i, revision %i", ct->isa_level, ct->isa_revision);
                break;
        default:debug(" ISA level %i", ct->isa_level);
        }

        debug("), ");
        if (ct->nr_of_tlb_entries)
                debug("%i TLB entries", ct->nr_of_tlb_entries);
        else
                debug("no TLB");
        debug("\n");

        if (ct->picache) {
                debug("L1 I-cache: %i KB", (1 << ct->picache) / 1024);
                if (ct->pilinesize)
                        debug(", %i bytes per line", 1 << ct->pilinesize);
                if (ct->piways > 1)
                        debug(", %i-way", ct->piways);
                else
                        debug(", direct-mapped");
                debug("\n");
        }

        if (ct->pdcache) {
                debug("L1 D-cache: %i KB", (1 << ct->pdcache) / 1024);
                if (ct->pdlinesize)
                        debug(", %i bytes per line", 1 << ct->pdlinesize);
                if (ct->pdways > 1)
                        debug(", %i-way", ct->pdways);
                else
                        debug(", direct-mapped");
                debug("\n");
        }

        if (ct->scache) {
                int kb = (1 << ct->scache) / 1024;
                debug("L2 cache: %i %s",
                    kb >= 1024? kb / 1024 : kb, kb >= 1024? "MB":"KB");
                if (ct->slinesize)
                        debug(", %i bytes per line", 1 << ct->slinesize);
                if (ct->sways > 1)
                        debug(", %i-way", ct->sways);
                else
                        debug(", direct-mapped");
                debug("\n");
        }

        debug_indentation(-iadd);
}


/*
 *  mips_cpu_list_available_types():
 *
 *  Print a list of available MIPS CPU types.
 */
void mips_cpu_list_available_types(void)
{
        int i, j;
        struct mips_cpu_type_def cpu_type_defs[] = MIPS_CPU_TYPE_DEFS;

        i = 0;
        while (cpu_type_defs[i].name != NULL) {
                debug("%s", cpu_type_defs[i].name);
                for (j=10 - strlen(cpu_type_defs[i].name); j>0; j--)
                        debug(" ");
                i++;
                if ((i % 6) == 0 || cpu_type_defs[i].name == NULL)
                        debug("\n");
        }
}


/*
 *  mips_cpu_instruction_has_delayslot():
 *
 *  Return 1 if an opcode is a branch, 0 otherwise.
 */
int mips_cpu_instruction_has_delayslot(struct cpu *cpu, unsigned char *ib)
{
        uint32_t iword = *((uint32_t *)&ib[0]);

        if (cpu->byte_order == EMUL_LITTLE_ENDIAN)
                iword = LE32_TO_HOST(iword);
        else
                iword = BE32_TO_HOST(iword);

        switch (iword >> 26) {
        case HI6_SPECIAL:
                switch (iword & 0x3f) {
                case SPECIAL_JR:
                case SPECIAL_JALR:
                        return 1;
                }
                break;
        case HI6_REGIMM:
                switch ((iword >> 16) & 0x1f) {
                case REGIMM_BLTZ:
                case REGIMM_BGEZ:
                case REGIMM_BLTZL:
                case REGIMM_BGEZL:
                case REGIMM_BLTZAL:
                case REGIMM_BLTZALL:
                case REGIMM_BGEZAL:
                case REGIMM_BGEZALL:
                        return 1;
                }
                break;
        case HI6_BEQ:
        case HI6_BEQL:
        case HI6_BNE:
        case HI6_BNEL:
        case HI6_BGTZ:
        case HI6_BGTZL:
        case HI6_BLEZ:
        case HI6_BLEZL:
        case HI6_J:
        case HI6_JAL:
                return 1;
        }

        return 0;
}


/*
 *  mips_cpu_tlbdump():
 *
 *  Called from the debugger to dump the TLB in a readable format.
 *  x is the cpu number to dump, or -1 to dump all CPUs.
 *
 *  If rawflag is nonzero, then the TLB contents isn't formated nicely,
 *  just dumped.
 */
void mips_cpu_tlbdump(struct machine *m, int x, int rawflag)
{
        int i, j;

        /*  Raw output:  */
        if (rawflag) {
                for (i=0; i<m->ncpus; i++) {
                        struct mips_coproc *cop0 =
                            m->cpus[i]->cd.mips.coproc[0];

                        if (x >= 0 && i != x)
                                continue;

                        /*  Print index, random, and wired:  */
                        printf("cpu%i: (", i);

                        if (m->cpus[i]->is_32bit)
                                printf("index=0x%08x random=0x%08x",
                                    (int) cop0->reg[COP0_INDEX],
                                    (int) cop0->reg[COP0_RANDOM]);
                        else
                                printf("index=0x%016"PRIx64
                                    " random=0x%016"PRIx64,
                                    (uint64_t) cop0->reg[COP0_INDEX],
                                    (uint64_t) cop0->reg[COP0_RANDOM]);

                        if (m->cpus[i]->cd.mips.cpu_type.isa_level >= 3)
                                printf(" wired=0x%"PRIx64,
                                    (uint64_t) cop0->reg[COP0_WIRED]);

                        printf(")\n");

                        for (j=0; j<m->cpus[i]->cd.mips.cpu_type.
                            nr_of_tlb_entries; j++) {
                                if (m->cpus[i]->cd.mips.cpu_type.mmu_model ==
                                    MMU3K)
                                        printf("%3i: hi=0x%08"PRIx32" lo=0x%08"
                                            PRIx32"\n", j,
                                            (uint32_t) cop0->tlbs[j].hi,
                                            (uint32_t) cop0->tlbs[j].lo0);
                                else if (m->cpus[i]->is_32bit)
                                        printf("%3i: hi=0x%08"PRIx32" mask=0x"
                                            "%08"PRIx32" lo0=0x%08"PRIx32
                                            " lo1=0x%08"PRIx32"\n", j,
                                            (uint32_t) cop0->tlbs[j].hi,
                                            (uint32_t) cop0->tlbs[j].mask,
                                            (uint32_t) cop0->tlbs[j].lo0,
                                            (uint32_t) cop0->tlbs[j].lo1);
                                else
                                        printf("%3i: hi=0x%016"PRIx64" mask="
                                            "0x%016"PRIx64" lo0=0x%016"PRIx64
                                            " lo1=0x%016"PRIx64"\n", j,
                                            (uint64_t) cop0->tlbs[j].hi,
                                            (uint64_t) cop0->tlbs[j].mask,
                                            (uint64_t) cop0->tlbs[j].lo0,
                                            (uint64_t) cop0->tlbs[j].lo1);
                        }
                }

                return;
        }

        /*  Nicely formatted output:  */
        for (i=0; i<m->ncpus; i++) {
                int pageshift = 12;
                struct mips_coproc *cop0 = m->cpus[i]->cd.mips.coproc[0];

                if (x >= 0 && i != x)
                        continue;

                if (m->cpus[i]->cd.mips.cpu_type.rev == MIPS_R4100)
                        pageshift = 10;

                /*  Print index, random, and wired:  */
                printf("cpu%i: (", i);
                switch (m->cpus[i]->cd.mips.cpu_type.isa_level) {
                case 1:
                case 2: printf("index=0x%x random=0x%x",
                            (int) ((cop0->reg[COP0_INDEX] & R2K3K_INDEX_MASK)
                            >> R2K3K_INDEX_SHIFT),
                            (int) ((cop0->reg[COP0_RANDOM] & R2K3K_RANDOM_MASK)
                            >> R2K3K_RANDOM_SHIFT));
                        break;
                default:printf("index=0x%x random=0x%x",
                            (int) (cop0->reg[COP0_INDEX] & INDEX_MASK),
                            (int) (cop0->reg[COP0_RANDOM] & RANDOM_MASK));
                        printf(" wired=0x%"PRIx64,
                            (uint64_t) cop0->reg[COP0_WIRED]);
                }

                printf(")\n");

                for (j=0; j<m->cpus[i]->cd.mips.cpu_type.
                    nr_of_tlb_entries; j++) {
                        uint64_t hi = cop0->tlbs[j].hi;
                        uint64_t lo0 = cop0->tlbs[j].lo0;
                        uint64_t lo1 = cop0->tlbs[j].lo1;
                        uint64_t mask = cop0->tlbs[j].mask;
                        uint64_t psize;

                        mask |= (1 << (pageshift+1)) - 1;
                        /*  here mask = e.g. 0x1fff for 4KB pages  */

                        printf("%3i: ", j);

                        switch (m->cpus[i]->cd.mips.cpu_type.mmu_model) {
                        case MMU3K:
                                if (!(lo0 & R2K3K_ENTRYLO_V)) {
                                        printf("(invalid)\n");
                                        continue;
                                }
                                printf("vaddr=0x%08x ",
                                    (int) (hi&R2K3K_ENTRYHI_VPN_MASK));
                                if (lo0 & R2K3K_ENTRYLO_G)
                                        printf("(global), ");
                                else
                                        printf("(asid %02x),", (int) ((hi &
                                            R2K3K_ENTRYHI_ASID_MASK)
                                            >> R2K3K_ENTRYHI_ASID_SHIFT));
                                printf(" paddr=0x%08x ",
                                    (int) (lo0&R2K3K_ENTRYLO_PFN_MASK));
                                if (lo0 & R2K3K_ENTRYLO_N)
                                        printf("N");
                                if (lo0 & R2K3K_ENTRYLO_D)
                                        printf("D");
                                printf("\n");
                                break;
                        default:switch (m->cpus[i]->cd.mips.cpu_type.mmu_model){
                                case MMU32:
                                        printf("vaddr=0x%08"PRIx32" ",
                                            (uint32_t) (hi & ~mask));
                                        break;
                                default:/*  R4x00, R1x000, MIPS64, etc.  */
                                        printf("vaddr=%016"PRIx64" ",
                                            (uint64_t) (hi & ~mask));
                                }
                                if (hi & TLB_G)
                                        printf("(global): ");
                                else
                                        printf("(asid %02x):",
                                            (int) (hi & ENTRYHI_ASID));

                                /*  TODO: Coherency bits  */

                                if (!(lo0 & ENTRYLO_V))
                                        printf(" p0=(invalid)   ");
                                else {
                                        uint64_t paddr = lo0 & ENTRYLO_PFN_MASK;
                                        paddr >>= ENTRYLO_PFN_SHIFT;
                                        paddr <<= pageshift;
                                        paddr &= ~(mask >> 1);
                                        printf(" p0=0x%09"PRIx64" ",
                                            (uint64_t) paddr);
                                }
                                printf(lo0 & ENTRYLO_D? "D" : " ");

                                if (!(lo1 & ENTRYLO_V))
                                        printf(" p1=(invalid)   ");
                                else {
                                        uint64_t paddr = lo1 & ENTRYLO_PFN_MASK;
                                        paddr >>= ENTRYLO_PFN_SHIFT;
                                        paddr <<= pageshift;
                                        paddr &= ~(mask >> 1);
                                        printf(" p1=0x%09"PRIx64" ",
                                            (uint64_t) paddr);
                                }
                                printf(lo1 & ENTRYLO_D? "D" : " ");

                                /*  convert e.g. 0x1fff to 4096  */
                                psize = (mask + 1) >> 1;

                                if (psize >= 1024 && psize <= 256*1024)
                                        printf(" (%iKB)", (int) (psize >> 10));
                                else if (psize >= 1024*1024 && psize <=
                                    64*1024*1024)
                                        printf(" (%iMB)", (int) (psize >> 20));
                                else
                                        printf(" (?)");

                                printf("\n");
                        }
                }
        }
}


/*
 *  mips_cpu_disassemble_instr():
 *
 *  Convert an instruction word into human readable format, for instruction
 *  tracing.
 *
 *  If running is 1, cpu->pc should be the address of the instruction.
 *
 *  If running is 0, things that depend on the runtime environment (eg.
 *  register contents) will not be shown, and addr will be used instead of
 *  cpu->pc for relative addresses.
 *
 *  NOTE 2:  coprocessor instructions are not decoded nicely yet  (TODO)
 */
int mips_cpu_disassemble_instr(struct cpu *cpu, unsigned char *originstr,
        int running, uint64_t dumpaddr)
{
        int hi6, special6, regimm5, sub;
        int rt, rd, rs, sa, imm, copz, cache_op, which_cache, showtag;
        uint64_t addr, offset;
        uint32_t instrword;
        unsigned char instr[4];
        char *symbol;

        if (running)
                dumpaddr = cpu->pc;

        if ((dumpaddr & 3) != 0)
                printf("WARNING: Unaligned address!\n");

        symbol = get_symbol_name(&cpu->machine->symbol_context,
            dumpaddr, &offset);
        if (symbol != NULL && offset==0)
                debug("<%s>\n", symbol);

        if (cpu->machine->ncpus > 1 && running)
                debug("cpu%i: ", cpu->cpu_id);

        if (cpu->is_32bit)
                debug("%08"PRIx32, (uint32_t)dumpaddr);
        else
                debug("%016"PRIx64, (uint64_t)dumpaddr);

        *((uint32_t *)&instr[0]) = *((uint32_t *)&originstr[0]);

        /*
         *  The rest of the code is written for little endian,
         *  so swap if necessary:
         */
        if (cpu->byte_order == EMUL_BIG_ENDIAN) {
                int tmp = instr[0]; instr[0] = instr[3];
                    instr[3] = tmp;
                tmp = instr[1]; instr[1] = instr[2];
                    instr[2] = tmp;
        }

        debug(": %02x%02x%02x%02x",
            instr[3], instr[2], instr[1], instr[0]);

        if (running && cpu->delay_slot)
                debug(" (d)");

        debug("\t");

        /*
         *  Decode the instruction:
         */

        hi6 = (instr[3] >> 2) & 0x3f;

        switch (hi6) {
        case HI6_SPECIAL:
                special6 = instr[0] & 0x3f;
                switch (special6) {
                case SPECIAL_SLL:
                case SPECIAL_SRL:
                case SPECIAL_SRA:
                case SPECIAL_DSLL:
                case SPECIAL_DSRL:
                case SPECIAL_DSRA:
                case SPECIAL_DSLL32:
                case SPECIAL_DSRL32:
                case SPECIAL_DSRA32:
                        sub = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rt = instr[2] & 31;
                        rd = (instr[1] >> 3) & 31;
                        sa = ((instr[1] & 7) << 2) + ((instr[0] >> 6) & 3);

                        if (rd == 0 && special6 == SPECIAL_SLL) {
                                if (sa == 0)
                                        debug("nop");
                                else if (sa == 1)
                                        debug("ssnop");
                                else if (sa == 3)
                                        debug("ehb");
                                else
                                        debug("nop (weird, sa=%i)", sa);
                                break;
                        }

                        switch (sub) {
                        case 0x00:
                                debug("%s\t%s,",
                                    special_names[special6],
                                    regname(cpu->machine, rd));
                                debug("%s,%i", regname(cpu->machine, rt), sa);
                                break;
                        case 0x01:
                                debug("%s\t%s,",
                                    special_rot_names[special6],
                                    regname(cpu->machine, rd));
                                debug("%s,%i", regname(cpu->machine, rt), sa);
                                break;
                        default:debug("UNIMPLEMENTED special, sub=0x%02x\n",
                                    sub);
                        }
                        break;
                case SPECIAL_DSRLV:
                case SPECIAL_DSRAV:
                case SPECIAL_DSLLV:
                case SPECIAL_SLLV:
                case SPECIAL_SRAV:
                case SPECIAL_SRLV:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rt = instr[2] & 31;
                        rd = (instr[1] >> 3) & 31;
                        sub = ((instr[1] & 7) << 2) + ((instr[0] >> 6) & 3);

                        switch (sub) {
                        case 0x00:
                                debug("%s\t%s", special_names[special6],
                                    regname(cpu->machine, rd));
                                debug(",%s", regname(cpu->machine, rt));
                                debug(",%s", regname(cpu->machine, rs));
                                break;
                        case 0x01:
                                debug("%s\t%s", special_rot_names[special6],
                                    regname(cpu->machine, rd));
                                debug(",%s", regname(cpu->machine, rt));
                                debug(",%s", regname(cpu->machine, rs));
                                break;
                        default:debug("UNIMPLEMENTED special, sub=0x%02x\n",
                                    sub);
                        }
                        break;
                case SPECIAL_JR:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        symbol = get_symbol_name(&cpu->machine->symbol_context,
                            cpu->cd.mips.gpr[rs], &offset);
                        /*  .hb = hazard barrier hint on MIPS32/64 rev 2  */
                        debug("jr%s\t%s",
                            (instr[1] & 0x04) ? ".hb" : "",
                            regname(cpu->machine, rs));
                        if (running && symbol != NULL)
                                debug("\t<%s>", symbol);
                        break;
                case SPECIAL_JALR:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rd = (instr[1] >> 3) & 31;
                        symbol = get_symbol_name(&cpu->machine->symbol_context,
                            cpu->cd.mips.gpr[rs], &offset);
                        /*  .hb = hazard barrier hint on MIPS32/64 rev 2  */
                        debug("jalr%s\t%s",
                            (instr[1] & 0x04) ? ".hb" : "",
                            regname(cpu->machine, rd));
                        debug(",%s", regname(cpu->machine, rs));
                        if (running && symbol != NULL)
                                debug("\t<%s>", symbol);
                        break;
                case SPECIAL_MFHI:
                case SPECIAL_MFLO:
                        rd = (instr[1] >> 3) & 31;
                        debug("%s\t%s", special_names[special6],
                            regname(cpu->machine, rd));
                        break;
                case SPECIAL_MTLO:
                case SPECIAL_MTHI:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        debug("%s\t%s", special_names[special6],
                            regname(cpu->machine, rs));
                        break;
                case SPECIAL_ADD:
                case SPECIAL_ADDU:
                case SPECIAL_SUB:
                case SPECIAL_SUBU:
                case SPECIAL_AND:
                case SPECIAL_OR:
                case SPECIAL_XOR:
                case SPECIAL_NOR:
                case SPECIAL_SLT:
                case SPECIAL_SLTU: 
                case SPECIAL_DADD:
                case SPECIAL_DADDU:
                case SPECIAL_DSUB:
                case SPECIAL_DSUBU:
                case SPECIAL_MOVZ:
                case SPECIAL_MOVN:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rt = instr[2] & 31;
                        rd = (instr[1] >> 3) & 31;
                        if (cpu->is_32bit && (special6 == SPECIAL_ADDU ||
                            special6 == SPECIAL_SUBU) && rt == 0) {
                                /*  Special case 1: addu/subu with
                                    rt = the zero register ==> move  */
                                debug("move\t%s", regname(cpu->machine, rd));
                                debug(",%s", regname(cpu->machine, rs));
                        } else if (special6 == SPECIAL_ADDU && cpu->is_32bit
                            && rs == 0) {
                                /*  Special case 2: addu with
                                    rs = the zero register ==> move  */
                                debug("move\t%s", regname(cpu->machine, rd));
                                debug(",%s", regname(cpu->machine, rt));
                        } else {
                                debug("%s\t%s", special_names[special6],
                                    regname(cpu->machine, rd));
                                debug(",%s", regname(cpu->machine, rs));
                                debug(",%s", regname(cpu->machine, rt));
                        }
                        break;
                case SPECIAL_MULT:
                case SPECIAL_MULTU:
                case SPECIAL_DMULT:
                case SPECIAL_DMULTU:
                case SPECIAL_DIV:
                case SPECIAL_DIVU:
                case SPECIAL_DDIV:  
                case SPECIAL_DDIVU:
                case SPECIAL_TGE:                
                case SPECIAL_TGEU:
                case SPECIAL_TLT:
                case SPECIAL_TLTU:
                case SPECIAL_TEQ:
                case SPECIAL_TNE:
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rt = instr[2] & 31;
                        rd = (instr[1] >> 3) & 31;
                        debug("%s\t", special_names[special6]);
                        if (rd != 0) {
                                if (cpu->cd.mips.cpu_type.rev == MIPS_R5900) {
                                        if (special6 == SPECIAL_MULT ||
                                            special6 == SPECIAL_MULTU)
                                                debug("%s,",
                                                    regname(cpu->machine, rd));
                                        else
                                                debug("WEIRD_R5900_RD,");
                                } else {
                                        debug("WEIRD_RD_NONZERO,");
                                }
                        }
                        debug("%s", regname(cpu->machine, rs));
                        debug(",%s", regname(cpu->machine, rt));
                        break;
                case SPECIAL_SYNC:
                        imm = ((instr[1] & 7) << 2) + (instr[0] >> 6);
                        debug("sync\t0x%02x", imm);
                        break;
                case SPECIAL_SYSCALL:
                        imm = (((instr[3] << 24) + (instr[2] << 16) +
                            (instr[1] << 8) + instr[0]) >> 6) & 0xfffff;
                        if (imm != 0)
                                debug("syscall\t0x%05x", imm);
                        else
                                debug("syscall");
                        break;
                case SPECIAL_BREAK:
                        imm = (((instr[3] << 24) + (instr[2] << 16) +
                            (instr[1] << 8) + instr[0]) >> 6) & 0xfffff;
                        if (imm != 0)
                                debug("break\t0x%05x", imm);
                        else
                                debug("break");
                        break;
                case SPECIAL_MFSA:
                        if (cpu->cd.mips.cpu_type.rev == MIPS_R5900) {
                                rd = (instr[1] >> 3) & 31;
                                debug("mfsa\t%s", regname(cpu->machine, rd));
                        } else {
                                debug("unimplemented special 0x28");
                        }
                        break;
                case SPECIAL_MTSA:
                        if (cpu->cd.mips.cpu_type.rev == MIPS_R5900) {
                                rs = ((instr[3] & 3) << 3) +
                                    ((instr[2] >> 5) & 7);
                                debug("mtsa\t%s", regname(cpu->machine, rs));
                        } else {
                                debug("unimplemented special 0x29");
                        }
                        break;
                default:
                        debug("%s\t= UNIMPLEMENTED", special_names[special6]);
                }
                break;
        case HI6_BEQ:
        case HI6_BEQL:
        case HI6_BNE:
        case HI6_BNEL:
        case HI6_BGTZ:
        case HI6_BGTZL:
        case HI6_BLEZ:
        case HI6_BLEZL:
                rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                rt = instr[2] & 31;
                imm = (instr[1] << 8) + instr[0];
                if (imm >= 32768)
                        imm -= 65536;
                addr = (dumpaddr + 4) + (imm << 2);

                if (hi6 == HI6_BEQ && rt == MIPS_GPR_ZERO &&
                    rs == MIPS_GPR_ZERO)
                        debug("b\t");
                else {
                        debug("%s\t", hi6_names[hi6]);
                        switch (hi6) {
                        case HI6_BEQ:
                        case HI6_BEQL:
                        case HI6_BNE:
                        case HI6_BNEL:
                                debug("%s,", regname(cpu->machine, rt));
                        }
                        debug("%s,", regname(cpu->machine, rs));
                }

                if (cpu->is_32bit)
                        debug("0x%08"PRIx32, (uint32_t)addr);
                else
                        debug("0x%016"PRIx64, (uint64_t)addr);

                symbol = get_symbol_name(&cpu->machine->symbol_context,
                    addr, &offset);
                if (symbol != NULL && offset != addr)
                        debug("\t<%s>", symbol);
                break;
        case HI6_ADDI:
        case HI6_ADDIU:
        case HI6_DADDI:
        case HI6_DADDIU:
        case HI6_SLTI:
        case HI6_SLTIU:
        case HI6_ANDI:
        case HI6_ORI:
        case HI6_XORI:
                rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                rt = instr[2] & 31;
                imm = (instr[1] << 8) + instr[0];
                if (imm >= 32768)
                        imm -= 65536;
                debug("%s\t%s,", hi6_names[hi6], regname(cpu->machine, rt));
                debug("%s,", regname(cpu->machine, rs));
                if (hi6 == HI6_ANDI || hi6 == HI6_ORI || hi6 == HI6_XORI)
                        debug("0x%04x", imm & 0xffff);
                else
                        debug("%i", imm);
                break;
        case HI6_LUI:
                rt = instr[2] & 31;
                imm = (instr[1] << 8) + instr[0];
                debug("lui\t%s,0x%x", regname(cpu->machine, rt), imm);
                break;
        case HI6_LB:
        case HI6_LBU:
        case HI6_LH:
        case HI6_LHU:
        case HI6_LW:
        case HI6_LWU:
        case HI6_LD:
        case HI6_LQ_MDMX:
        case HI6_LWC1:
        case HI6_LWC2:
        case HI6_LWC3:
        case HI6_LDC1:
        case HI6_LDC2:
        case HI6_LL:
        case HI6_LLD:
        case HI6_SB:
        case HI6_SH:
        case HI6_SW:
        case HI6_SD:
        case HI6_SQ_SPECIAL3:
        case HI6_SC:
        case HI6_SCD:
        case HI6_SWC1:
        case HI6_SWC2:
        case HI6_SWC3:
        case HI6_SDC1:
        case HI6_SDC2:
        case HI6_LWL:   
        case HI6_LWR:
        case HI6_LDL:
        case HI6_LDR:
        case HI6_SWL:
        case HI6_SWR:
        case HI6_SDL:
        case HI6_SDR:
                if (hi6 == HI6_LQ_MDMX &&
                    cpu->cd.mips.cpu_type.rev != MIPS_R5900) {
                        debug("mdmx\t(UNIMPLEMENTED)");
                        break;
                }
                if (hi6 == HI6_SQ_SPECIAL3 &&
                    cpu->cd.mips.cpu_type.rev != MIPS_R5900) {
                        int msbd, lsb, sub10;
                        special6 = instr[0] & 0x3f;
                        rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                        rt = instr[2] & 31;
                        rd = msbd = (instr[1] >> 3) & 31;
                        lsb = ((instr[1] & 7) << 2) | (instr[0] >> 6);
                        sub10 = (rs << 5) | lsb;

                        switch (special6) {

                        case SPECIAL3_EXT:
                        case SPECIAL3_DEXT:
                        case SPECIAL3_DEXTM:
                        case SPECIAL3_DEXTU:
                                debug("%s", special3_names[special6]);
                                if (special6 == SPECIAL3_DEXTM)
                                        msbd += 32;
                                if (special6 == SPECIAL3_DEXTU)
                                        lsb += 32;
                                debug("\t%s", regname(cpu->machine, rt));
                                debug(",%s", regname(cpu->machine, rs));
                                debug(",%i,%i", lsb, msbd + 1);
                                break;

                        case SPECIAL3_INS:
                        case SPECIAL3_DINS:
                        case SPECIAL3_DINSM:
                        case SPECIAL3_DINSU:
                                debug("%s", special3_names[special6]);
                                if (special6 == SPECIAL3_DINSM)
                                        msbd += 32;
                                if (special6 == SPECIAL3_DINSU) {
                                        lsb += 32;
                                        msbd += 32;
                                }
                                msbd -= lsb;
                                debug("\t%s", regname(cpu->machine, rt));
                                debug(",%s", regname(cpu->machine, rs));
                                debug(",%i,%i", lsb, msbd + 1);
                                break;

                        case SPECIAL3_BSHFL:
                                switch (sub10) {
                                case BSHFL_WSBH:
                                case BSHFL_SEB:
                                case BSHFL_SEH:
                                        switch (sub10) {
                                        case BSHFL_WSBH: debug("wsbh"); break;
                                        case BSHFL_SEB:  debug("seb"); break;
                                        case BSHFL_SEH:  debug("seh"); break;
                                        }
                                        debug("\t%s", regname(cpu->machine,rd));
                                        debug(",%s", regname(cpu->machine,rt));
                                        break;
                                default:debug("%s", special3_names[special6]);
                                        debug("\t(UNIMPLEMENTED)");
                                }
                                break;

                        case SPECIAL3_DBSHFL:
                                switch (sub10) {
                                case BSHFL_DSBH:
                                case BSHFL_DSHD:
                                        switch (sub10) {
                                        case BSHFL_DSBH: debug("dsbh"); break;
                                        case BSHFL_DSHD: debug("dshd"); break;
                                        }
                                        debug("\t%s", regname(cpu->machine,rd));
                                        debug(",%s", regname(cpu->machine,rt));
                                        break;
                                default:debug("%s", special3_names[special6]);
                                        debug("\t(UNIMPLEMENTED)");
                                }
                                break;

                        case SPECIAL3_RDHWR:
                                debug("%s", special3_names[special6]);
                                debug("\t%s", regname(cpu->machine, rt));
                                debug(",hwr%i", rd);
                                break;

                        default:debug("%s", special3_names[special6]);
                                debug("\t(UNIMPLEMENTED)");
                        }
                        break;
                }

                rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                rt = instr[2] & 31;
                imm = (instr[1] << 8) + instr[0];
                if (imm >= 32768)
                        imm -= 65536;
                symbol = get_symbol_name(&cpu->machine->symbol_context,
                    cpu->cd.mips.gpr[rs] + imm, &offset);

                /*  LWC3 is PREF in the newer ISA levels:  */
                /*  TODO: Which ISAs? IV? V? 32? 64?  */
                if (cpu->cd.mips.cpu_type.isa_level >= 4 && hi6 == HI6_LWC3) {
                        debug("pref\t0x%x,%i(%s)",
                            rt, imm, regname(cpu->machine, rs));

                        if (running) {
                                debug("\t[0x%016"PRIx64" = %s]",
                                    (uint64_t)(cpu->cd.mips.gpr[rs] + imm));
                                if (symbol != NULL)
                                        debug(" = %s", symbol);
                                debug("]");
                        }
                        goto disasm_ret;
                }

                debug("%s\t", hi6_names[hi6]);

                if (hi6 == HI6_SWC1 || hi6 == HI6_SWC2 || hi6 == HI6_SWC3 ||
                    hi6 == HI6_SDC1 || hi6 == HI6_SDC2 ||
                    hi6 == HI6_LWC1 || hi6 == HI6_LWC2 || hi6 == HI6_LWC3 ||
                    hi6 == HI6_LDC1 || hi6 == HI6_LDC2)
                        debug("r%i", rt);
                else
                        debug("%s", regname(cpu->machine, rt));

                debug(",%i(%s)", imm, regname(cpu->machine, rs));

                if (running) {
                        debug("\t[");

                        if (cpu->is_32bit)
                                debug("0x%08"PRIx32,
                                    (uint32_t) (cpu->cd.mips.gpr[rs] + imm));
                        else
                                debug("0x%016"PRIx64,
                                    (uint64_t) (cpu->cd.mips.gpr[rs] + imm));

                        if (symbol != NULL)
                                debug(" = %s", symbol);

                        /*  TODO: In some cases, it is possible to peek into
                            memory, and display that data here, like for the
                            other emulation modes.  */

                        debug("]");
                }
                break;

        case HI6_J:
        case HI6_JAL:
                imm = (((instr[3] & 3) << 24) + (instr[2] << 16) +
                    (instr[1] << 8) + instr[0]) << 2;
                addr = (dumpaddr + 4) & ~((1 << 28) - 1);
                addr |= imm;
                symbol = get_symbol_name(&cpu->machine->symbol_context,
                    addr, &offset);
                debug("%s\t0x", hi6_names[hi6]);
                if (cpu->is_32bit)
                        debug("%08"PRIx32, (uint32_t) addr);
                else
                        debug("%016"PRIx64, (uint64_t) addr);
                if (symbol != NULL)
                        debug("\t<%s>", symbol);
                break;

        case HI6_COP0:
        case HI6_COP1:
        case HI6_COP2:
        case HI6_COP3:
                imm = (instr[3] << 24) + (instr[2] << 16) +
                     (instr[1] << 8) + instr[0];
                imm &= ((1 << 26) - 1);

                /*  Call coproc_function(), but ONLY disassembly, no exec:  */
                coproc_function(cpu, cpu->cd.mips.coproc[hi6 - HI6_COP0],
                    hi6 - HI6_COP0, imm, 1, running);
                return sizeof(instrword);

        case HI6_CACHE:
                rt   = ((instr[3] & 3) << 3) + (instr[2] >> 5); /*  base  */
                copz = instr[2] & 31;
                imm  = (instr[1] << 8) + instr[0];
                cache_op    = copz >> 2;
                which_cache = copz & 3;
                showtag = 0;
                debug("cache\t0x%02x,0x%04x(%s)", copz, imm,
                    regname(cpu->machine, rt));
                if (which_cache==0)     debug("  [ primary I-cache");
                if (which_cache==1)     debug("  [ primary D-cache");
                if (which_cache==2)     debug("  [ secondary I-cache");
                if (which_cache==3)     debug("  [ secondary D-cache");
                debug(", ");
                if (cache_op==0)        debug("index invalidate");
                if (cache_op==1)        debug("index load tag");
                if (cache_op==2)        debug("index store tag"), showtag=1;
                if (cache_op==3)        debug("create dirty exclusive");
                if (cache_op==4)        debug("hit invalidate");
                if (cache_op==5)     debug("fill OR hit writeback invalidate");
                if (cache_op==6)        debug("hit writeback");
                if (cache_op==7)        debug("hit set virtual");
                if (running)
                        debug(", addr 0x%016"PRIx64,
                            (uint64_t)(cpu->cd.mips.gpr[rt] + imm));
                if (showtag)
                debug(", taghi=%08lx lo=%08lx",
                    (long)cpu->cd.mips.coproc[0]->reg[COP0_TAGDATA_HI],
                    (long)cpu->cd.mips.coproc[0]->reg[COP0_TAGDATA_LO]);
                debug(" ]");
                break;

        case HI6_SPECIAL2:
                special6 = instr[0] & 0x3f;
                instrword = (instr[3] << 24) + (instr[2] << 16) +
                    (instr[1] << 8) + instr[0];
                rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                rt = instr[2] & 31;
                rd = (instr[1] >> 3) & 31;

                if (cpu->cd.mips.cpu_type.rev == MIPS_R5900) {
                        int c790mmifunc = (instrword >> 6) & 0x1f;
                        if (special6 != MMI_MMI0 && special6 != MMI_MMI1 &&
                            special6 != MMI_MMI2 && special6 != MMI_MMI3)
                                debug("%s\t", mmi_names[special6]);

                        switch (special6) {

                        case MMI_MADD:
                        case MMI_MADDU:
                                if (rd != MIPS_GPR_ZERO) {
                                        debug("%s,", regname(cpu->machine, rd));
                                }
                                debug("%s", regname(cpu->machine, rs));
                                debug(",%s", regname(cpu->machine, rt));
                                break;

                        case MMI_MMI0:
                                debug("%s\t", mmi0_names[c790mmifunc]);
                                switch (c790mmifunc) {

                                case MMI0_PEXTLB:
                                case MMI0_PEXTLH:
                                case MMI0_PEXTLW:
                                case MMI0_PMAXH:
                                case MMI0_PMAXW:
                                case MMI0_PPACB:
                                case MMI0_PPACH:
                                case MMI0_PPACW:
                                        debug("%s", regname(cpu->machine, rd));
                                        debug(",%s", regname(cpu->machine, rs));
                                        debug(",%s", regname(cpu->machine, rt));
                                        break;

                                default:debug("(UNIMPLEMENTED)");
                                }
                                break;

                        case MMI_MMI1:
                                debug("%s\t", mmi1_names[c790mmifunc]);
                                switch (c790mmifunc) {

                                case MMI1_PEXTUB:
                                case MMI1_PEXTUH:
                                case MMI1_PEXTUW:
                                case MMI1_PMINH:
                                case MMI1_PMINW:
                                        debug("%s", regname(cpu->machine, rd));
                                        debug(",%s", regname(cpu->machine, rs));
                                        debug(",%s", regname(cpu->machine, rt));
                                        break;

                                default:debug("(UNIMPLEMENTED)");
                                }
                                break;

                        case MMI_MMI2:
                                debug("%s\t", mmi2_names[c790mmifunc]);
                                switch (c790mmifunc) {

                                case MMI2_PMFHI:
                                case MMI2_PMFLO:
                                        debug("%s", regname(cpu->machine, rd));
                                        break;

                                case MMI2_PHMADH:
                                case MMI2_PHMSBH:
                                case MMI2_PINTH:
                                case MMI2_PMADDH:
                                case MMI2_PMADDW:
                                case MMI2_PMSUBH:
                                case MMI2_PMSUBW:
                                case MMI2_PMULTH:
                                case MMI2_PMULTW:
                                case MMI2_PSLLVW:
                                        debug("%s", regname(cpu->machine, rd));
                                        debug(",%s", regname(cpu->machine, rs));
                                        debug(",%s", regname(cpu->machine, rt));
                                        break;

                                default:debug("(UNIMPLEMENTED)");
                                }
                                break;

                        case MMI_MMI3:
                                debug("%s\t", mmi3_names[c790mmifunc]);
                                switch (c790mmifunc) {

                                case MMI3_PMTHI:
                                case MMI3_PMTLO:
                                        debug("%s", regname(cpu->machine, rs));
                                        break;

                                case MMI3_PINTEH:
                                case MMI3_PMADDUW:
                                case MMI3_PMULTUW:
                                case MMI3_PNOR:
                                case MMI3_POR:
                                case MMI3_PSRAVW:
                                        debug("%s", regname(cpu->machine, rd));
                                        debug(",%s", regname(cpu->machine, rs));
                                        debug(",%s", regname(cpu->machine, rt));
                                        break;

                                default:debug("(UNIMPLEMENTED)");
                                }
                                break;

                        default:debug("(UNIMPLEMENTED)");
                        }
                        break;
                }

                /*  SPECIAL2:  */
                debug("%s\t", special2_names[special6]);

                switch (special6) {

                case SPECIAL2_MADD:
                case SPECIAL2_MADDU:
                case SPECIAL2_MSUB:
                case SPECIAL2_MSUBU:
                        if (rd != MIPS_GPR_ZERO) {
                                debug("WEIRD_NONZERO_RD(%s),",
                                    regname(cpu->machine, rd));
                        }
                        debug("%s", regname(cpu->machine, rs));
                        debug(",%s", regname(cpu->machine, rt));
                        break;

                case SPECIAL2_MUL:
                        /*  Apparently used both on R5900 and MIPS32:  */
                        debug("%s", regname(cpu->machine, rd));
                        debug(",%s", regname(cpu->machine, rs));
                        debug(",%s", regname(cpu->machine, rt));
                        break;

                case SPECIAL2_CLZ:
                case SPECIAL2_CLO:
                case SPECIAL2_DCLZ:
                case SPECIAL2_DCLO:
                        debug("%s", regname(cpu->machine, rd));
                        debug(",%s", regname(cpu->machine, rs));
                        break;

                default:
                        debug("(UNIMPLEMENTED)");
                }
                break;

        case HI6_REGIMM:
                regimm5 = instr[2] & 0x1f;
                rs = ((instr[3] & 3) << 3) + ((instr[2] >> 5) & 7);
                imm = (instr[1] << 8) + instr[0];
                if (imm >= 32768)               
                        imm -= 65536;

                switch (regimm5) {

                case REGIMM_BLTZ:
                case REGIMM_BGEZ:
                case REGIMM_BLTZL:
                case REGIMM_BGEZL:
                case REGIMM_BLTZAL:
                case REGIMM_BLTZALL:
                case REGIMM_BGEZAL:
                case REGIMM_BGEZALL:
                        debug("%s\t%s,", regimm_names[regimm5],
                            regname(cpu->machine, rs));

                        addr = (dumpaddr + 4) + (imm << 2);

                        if (cpu->is_32bit)
                                debug("0x%08"PRIx32, (uint32_t) addr);
                        else
                                debug("0x%016"PRIx64, (uint64_t) addr);
                        break;

                case REGIMM_SYNCI:
                        debug("%s\t%i(%s)", regimm_names[regimm5],
                            imm, regname(cpu->machine, rs));
                        break;

                default:
                        debug("unimplemented regimm5 = 0x%02x", regimm5);
                }
                break;
        default:
                debug("unimplemented hi6 = 0x%02x", hi6);
        }

disasm_ret:
        debug("\n");
        return sizeof(instrword);
}


/*
 *  mips_cpu_register_dump():
 *
 *  Dump cpu registers in a relatively readable format.
 *
 *  gprs: set to non-zero to dump GPRs and hi/lo/pc
 *  coprocs: set bit 0..3 to dump registers in coproc 0..3.
 */
void mips_cpu_register_dump(struct cpu *cpu, int gprs, int coprocs)
{
        int coprocnr, i, bits32;
        uint64_t offset;
        char *symbol;
        int bits128 = cpu->cd.mips.cpu_type.rev == MIPS_R5900;

        bits32 = cpu->is_32bit;

        if (gprs) {
                /*  Special registers (pc, hi/lo) first:  */
                symbol = get_symbol_name(&cpu->machine->symbol_context,
                    cpu->pc, &offset);

                if (bits32)
                        debug("cpu%i:  pc = %08"PRIx32,
                            cpu->cpu_id, (uint32_t) cpu->pc);
                else if (bits128)
                        debug("cpu%i:  pc=%016"PRIx64,
                            cpu->cpu_id, (uint64_t) cpu->pc);
                else
                        debug("cpu%i:    pc = 0x%016"PRIx64,
                            cpu->cpu_id, (uint64_t) cpu->pc);

                debug("    <%s>\n", symbol != NULL? symbol :
                    " no symbol ");

                if (bits32)
                        debug("cpu%i:  hi = %08"PRIx32"  lo = %08"PRIx32"\n",
                            cpu->cpu_id, (uint32_t) cpu->cd.mips.hi,
                            (uint32_t) cpu->cd.mips.lo);
                else if (bits128) {
                        debug("cpu%i:  hi=%016"PRIx64"%016"PRIx64"  lo="
                            "%016"PRIx64"%016"PRIx64"\n", cpu->cpu_id,
                            cpu->cd.mips.hi1, cpu->cd.mips.hi,
                            cpu->cd.mips.lo1, cpu->cd.mips.lo);
                } else {
                        debug("cpu%i:    hi = 0x%016"PRIx64"    lo = 0x%016"
                            PRIx64"\n", cpu->cpu_id,
                            (uint64_t) cpu->cd.mips.hi,
                            (uint64_t) cpu->cd.mips.lo);
                }

                /*  General registers:  */
                if (bits128) {
                        /*  128-bit:  */
                        for (i=0; i<32; i++) {
                                int r = (i >> 1) + ((i & 1) << 4);
                                if ((i & 1) == 0)
                                        debug("cpu%i:", cpu->cpu_id);
                                if (r == MIPS_GPR_ZERO)
                                        debug("                           "
                                            "          ");
                                else
                                        debug(" %3s=%016"PRIx64"%016"PRIx64,
                                            regname(cpu->machine, r), (uint64_t)
                                            cpu->cd.mips.gpr_quadhi[r],
                                            (uint64_t)cpu->cd.mips.gpr[r]);
                                if ((i & 1) == 1)
                                        debug("\n");
                        }
                } else if (bits32) {
                        /*  32-bit:  */
                        for (i=0; i<32; i++) {
                                if ((i & 3) == 0)
                                        debug("cpu%i:", cpu->cpu_id);
                                if (i == MIPS_GPR_ZERO)
                                        debug("               ");
                                else
                                        debug(" %3s = %08"PRIx32,
                                            regname(cpu->machine, i),
                                            (uint32_t)cpu->cd.mips.gpr[i]);
                                if ((i & 3) == 3)
                                        debug("\n");
                        }
                } else {
                        /*  64-bit:  */
                        for (i=0; i<32; i++) {
                                int r = (i >> 1) + ((i & 1) << 4);
                                if ((i & 1) == 0)
                                        debug("cpu%i:", cpu->cpu_id);
                                if (r == MIPS_GPR_ZERO)
                                        debug("                           ");
                                else
                                        debug("   %3s = 0x%016"PRIx64,
                                            regname(cpu->machine, r),
                                            (uint64_t)cpu->cd.mips.gpr[r]);
                                if ((i & 1) == 1)
                                        debug("\n");
                        }
                }
        }

        for (coprocnr=0; coprocnr<4; coprocnr++) {
                int nm1 = 1;

                if (bits32)
                        nm1 = 3;

                if (!(coprocs & (1<<coprocnr)))
                        continue;
                if (cpu->cd.mips.coproc[coprocnr] == NULL) {
                        debug("cpu%i: no coprocessor %i\n",
                            cpu->cpu_id, coprocnr);
                        continue;
                }

                /*  Coprocessor registers:  */
                for (i=0; i<32; i++) {
                        /*  32-bit:  */
                        if ((i & nm1) == 0)
                                debug("cpu%i:", cpu->cpu_id);

                        if (cpu->machine->show_symbolic_register_names &&
                            coprocnr == 0)
                                debug(" %8s", cop0_names[i]);
                        else
                                debug(" c%i,%02i", coprocnr, i);

                        if (bits32)
                                debug("=%08x", (int)cpu->cd.mips.
                                    coproc[coprocnr]->reg[i]);
                        else {
                                if (coprocnr == 0 && (i == COP0_COUNT
                                    || i == COP0_COMPARE || i == COP0_INDEX
                                    || i == COP0_RANDOM || i == COP0_WIRED))
                                        debug(" =         0x%08x",
                                            (int) cpu->cd.mips.coproc[
                                            coprocnr]->reg[i]);
                                else
                                        debug(" = 0x%016"PRIx64, (uint64_t)
                                            cpu->cd.mips.coproc[
                                            coprocnr]->reg[i]);
                        }

                        if ((i & nm1) == nm1)
                                debug("\n");

                        /*  Skip the last 16 cop0 registers on R3000 etc.  */
                        if (coprocnr == 0 && cpu->cd.mips.cpu_type.isa_level < 3
                            && i == 15)
                                i = 31;
                }

                if (coprocnr == 0 && cpu->cd.mips.cpu_type.isa_level >= 32) {
                        debug("cpu%i: ", cpu->cpu_id);
                        debug("config_select1 = 0x");
                        if (cpu->is_32bit)
                                debug("%08"PRIx32,
                                    (uint32_t)cpu->cd.mips.cop0_config_select1);
                        else
                                debug("%016"PRIx64,
                                    (uint64_t)cpu->cd.mips.cop0_config_select1);
                        debug("\n");
                }

                /*  Floating point control registers:  */
                if (coprocnr == 1) {
                        for (i=0; i<32; i++)
                                switch (i) {
                                case MIPS_FPU_FCIR:
                                        printf("cpu%i: fcr0  (fcir) = 0x%08x\n",
                                            cpu->cpu_id, (int)cpu->cd.mips.
                                            coproc[coprocnr]->fcr[i]);
                                        break;
                                case MIPS_FPU_FCCR:
                                        printf("cpu%i: fcr25 (fccr) = 0x%08x\n",
                                            cpu->cpu_id, (int)cpu->cd.mips.
                                            coproc[coprocnr]->fcr[i]);
                                        break;
                                case MIPS_FPU_FCSR:
                                        printf("cpu%i: fcr31 (fcsr) = 0x%08x\n",
                                            cpu->cpu_id, (int)cpu->cd.mips.
                                            coproc[coprocnr]->fcr[i]);
                                        break;
                                }
                }
        }

        if (cpu->cd.mips.rmw) {
                printf("cpu%i: Read-Modify-Write in progress, address "
                    "0x%016"PRIx64"\n", cpu->cpu_id, cpu->cd.mips.rmw_addr);
        }
}


/*
 *  mips_cpu_interrupt_assert(), mips_cpu_interrupt_deassert():
 *
 *  Assert or deassert a MIPS CPU interrupt by masking in or out bits
 *  in the CAUSE register of coprocessor 0.
 */
void mips_cpu_interrupt_assert(struct interrupt *interrupt)
{
        struct cpu *cpu = interrupt->extra;
        cpu->cd.mips.coproc[0]->reg[COP0_CAUSE] |= interrupt->line;
}
void mips_cpu_interrupt_deassert(struct interrupt *interrupt)
{
        struct cpu *cpu = interrupt->extra;
        cpu->cd.mips.coproc[0]->reg[COP0_CAUSE] &= ~interrupt->line;
}


/*
 *  mips_cpu_exception():
 *
 *  Cause an exception in a CPU.  This sets a couple of coprocessor 0
 *  registers, and the program counter.
 *
 *      exccode         the exception code
 *      tlb             set to non-zero if the exception handler at
 *                      0x80000000 should be used. (normal = 0x80000180)
 *      vaddr           virtual address (for some exceptions)
 *      coproc_nr       coprocessor number (for some exceptions)
 *      vaddr_vpn2      vpn2 (for some exceptions)
 *      vaddr_asid      asid (for some exceptions)
 *      x_64            non-zero for 64-bit mode for R4000-style tlb misses
 */
void mips_cpu_exception(struct cpu *cpu, int exccode, int tlb, uint64_t vaddr,
        int coproc_nr, uint64_t vaddr_vpn2, int vaddr_asid, int x_64)
{
        uint64_t base;
        uint64_t *reg = &cpu->cd.mips.coproc[0]->reg[0];
        int exc_model = cpu->cd.mips.cpu_type.exc_model;

        if (cpu->is_halted) {
                /*
                 *  If the exception occurred on a 'wait' instruction, then let
                 *  the instruction following the wait instruction be the one
                 *  we continue at when the interrupt service routine returns.
                 */
                cpu->is_halted = 0;
                cpu->pc += sizeof(uint32_t);
        }

        if (!quiet_mode) {
                uint64_t offset;
                int x;
                char *symbol = get_symbol_name(&cpu->machine->symbol_context,
                    cpu->pc, &offset);

                debug("[ ");
                if (cpu->machine->ncpus > 1)
                        debug("cpu%i: ", cpu->cpu_id);

                debug("exception %s%s",
                    exception_names[exccode], tlb? " <tlb>" : "");

                switch (exccode) {

                case EXCEPTION_INT:
                        debug(" cause_im=0x%02x", (int)
                            ((reg[COP0_CAUSE] & CAUSE_IP_MASK)
                            >> CAUSE_IP_SHIFT));
                        break;

                case EXCEPTION_SYS:
                        debug(" v0=%i", (int)cpu->cd.mips.gpr[MIPS_GPR_V0]);
                        for (x=0; x<4; x++) {
                                int64_t d = cpu->cd.mips.gpr[MIPS_GPR_A0 + x];
                                char strbuf[30];

                                if (d > -256 && d < 256) {
                                        debug(" a%i=%i", x, (int)d);
                                } else if (memory_points_to_string(cpu,
                                    cpu->mem, d, 1)) {
                                        debug(" a%i=\"%s\"", x,
                                            memory_conv_to_string(cpu, cpu->mem,
                                            d, strbuf, sizeof(strbuf)));
                                } else {
                                        if (cpu->is_32bit)
                                                debug(" a%i=0x%"PRIx32, x,
                                                    (uint32_t)d);
                                        else
                                                debug(" a%i=0x%"PRIx64, x,
                                                    (uint64_t)d);
                                }
                        }
                        break;

                case EXCEPTION_CPU:
                        debug(" coproc_nr=%i", coproc_nr);
                        break;

                default:
                        if (cpu->is_32bit)
                                debug(" vaddr=0x%08x", (int)vaddr);
                        else
                                debug(" vaddr=0x%016"PRIx64, (uint64_t)vaddr);
                }

                if (cpu->is_32bit)
                        debug(" pc=0x%08"PRIx32" ", (uint32_t)cpu->pc);
                else
                        debug(" pc=0x%016"PRIx64" ", (uint64_t)cpu->pc);

                if (symbol != NULL)
                        debug("<%s> ]\n", symbol);
                else
                        debug("]\n");
        }

        if (tlb && vaddr < 0x1000) {
                uint64_t offset;
                char *symbol = get_symbol_name(&cpu->machine->symbol_context,
                    cpu->pc, &offset);
                fatal("[ ");
                if (cpu->machine->ncpus > 1)
                        fatal("cpu%i: ", cpu->cpu_id);
                fatal("warning: LOW reference: vaddr=");
                if (cpu->is_32bit)
                        fatal("0x%08"PRIx32, (uint32_t) vaddr);
                else
                        fatal("0x%016"PRIx64, (uint64_t) vaddr);
                fatal(", exception %s, pc=", exception_names[exccode]);
                if (cpu->is_32bit)
                        fatal("0x%08"PRIx32, (uint32_t) cpu->pc);
                else
                        fatal("0x%016"PRIx64, (uint64_t)cpu->pc);
                fatal(" <%s> ]\n", symbol? symbol : "(no symbol)");
        }

        /*  Clear the exception code bits of the cause register...  */
        if (exc_model == EXC3K)
                reg[COP0_CAUSE] &= ~R2K3K_CAUSE_EXCCODE_MASK;
        else
                reg[COP0_CAUSE] &= ~CAUSE_EXCCODE_MASK;

        /*  ... and OR in the exception code:  */
        reg[COP0_CAUSE] |= (exccode << CAUSE_EXCCODE_SHIFT);

        /*  Always set CE (according to the R5000 manual):  */
        reg[COP0_CAUSE] &= ~CAUSE_CE_MASK;
        reg[COP0_CAUSE] |= (coproc_nr << CAUSE_CE_SHIFT);

        if (tlb || (exccode >= EXCEPTION_MOD && exccode <= EXCEPTION_ADES) ||
            exccode == EXCEPTION_VCEI || exccode == EXCEPTION_VCED) {
                reg[COP0_BADVADDR] = vaddr;
                if (cpu->is_32bit)
                        reg[COP0_BADVADDR] = (int32_t)reg[COP0_BADVADDR];

                if (exc_model == EXC3K) {
                        reg[COP0_CONTEXT] &= ~R2K3K_CONTEXT_BADVPN_MASK;
                        reg[COP0_CONTEXT] |= ((vaddr_vpn2 <<
                            R2K3K_CONTEXT_BADVPN_SHIFT) &
                            R2K3K_CONTEXT_BADVPN_MASK);

                        reg[COP0_ENTRYHI] = (vaddr & R2K3K_ENTRYHI_VPN_MASK)
                            | (vaddr_asid << R2K3K_ENTRYHI_ASID_SHIFT);

                        /*  Sign-extend:  */
                        reg[COP0_CONTEXT] = (int64_t)(int32_t)reg[COP0_CONTEXT];
                        reg[COP0_ENTRYHI] = (int64_t)(int32_t)reg[COP0_ENTRYHI];
                } else {
                        if (cpu->cd.mips.cpu_type.rev == MIPS_R4100) {
                                reg[COP0_CONTEXT] &=
                                    ~CONTEXT_BADVPN2_MASK_R4100;
                                reg[COP0_CONTEXT] |= ((vaddr_vpn2 <<
                                    CONTEXT_BADVPN2_SHIFT) &
                                    CONTEXT_BADVPN2_MASK_R4100);

                                /*  TODO:  fix these  */
                                reg[COP0_XCONTEXT] &= ~XCONTEXT_R_MASK;
                                reg[COP0_XCONTEXT] &= ~XCONTEXT_BADVPN2_MASK;
                                reg[COP0_XCONTEXT] |= (vaddr_vpn2 << XCONTEXT_BADVPN2_SHIFT) & XCONTEXT_BADVPN2_MASK;
                                reg[COP0_XCONTEXT] |= ((vaddr >> 62) & 0x3) << XCONTEXT_R_SHIFT;

                                /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */

                                reg[COP0_ENTRYHI] = (vaddr & (ENTRYHI_R_MASK | ENTRYHI_VPN2_MASK | 0x1800)) | vaddr_asid;
                        } else {
                                reg[COP0_CONTEXT] &= ~CONTEXT_BADVPN2_MASK;
                                reg[COP0_CONTEXT] |= ((vaddr_vpn2 << CONTEXT_BADVPN2_SHIFT) & CONTEXT_BADVPN2_MASK);

                                reg[COP0_XCONTEXT] &= ~XCONTEXT_R_MASK;
                                reg[COP0_XCONTEXT] &= ~XCONTEXT_BADVPN2_MASK;
                                reg[COP0_XCONTEXT] |= (vaddr_vpn2 << XCONTEXT_BADVPN2_SHIFT) & XCONTEXT_BADVPN2_MASK;
                                reg[COP0_XCONTEXT] |= ((vaddr >> 62) & 0x3) << XCONTEXT_R_SHIFT;

                                /*  reg[COP0_PAGEMASK] = cpu->cd.mips.coproc[0]->tlbs[0].mask & PAGEMASK_MASK;  */

                                if (cpu->cd.mips.cpu_type.mmu_model == MMU10K)
                                        reg[COP0_ENTRYHI] = (vaddr & (ENTRYHI_R_MASK | ENTRYHI_VPN2_MASK_R10K)) | vaddr_asid;
                                else
                                        reg[COP0_ENTRYHI] = (vaddr & (ENTRYHI_R_MASK | ENTRYHI_VPN2_MASK)) | vaddr_asid;
                        }
                }
        }

        if (exc_model != EXC3K && reg[COP0_STATUS] & STATUS_EXL) {
                /*
                 *  Don't set EPC if STATUS_EXL is set, for R4000 and up.
                 *  This actually happens when running IRIX and Ultrix, when
                 *  they handle interrupts and/or tlb updates, I think, so
                 *  printing this with debug() looks better than with fatal().
                 */
                /*  debug("[ warning: cpu%i exception while EXL is set,"
                    " not setting EPC ]\n", cpu->cpu_id);  */
        } else {
                if (cpu->delay_slot) {
                        reg[COP0_EPC] = cpu->pc - 4;
                        reg[COP0_CAUSE] |= CAUSE_BD;
                } else {
                        reg[COP0_EPC] = cpu->pc;
                        reg[COP0_CAUSE] &= ~CAUSE_BD;
                }
        }

        if (cpu->delay_slot)
                cpu->delay_slot = EXCEPTION_IN_DELAY_SLOT;
        else
                cpu->delay_slot = NOT_DELAYED;

        /*  TODO: This is true for MIPS64, but how about others?  */
        if (reg[COP0_STATUS] & STATUS_BEV)
                base = 0xffffffffbfc00200ULL;
        else
                base = 0xffffffff80000000ULL;

        switch (exc_model) {
        case EXC3K:
                /*  Userspace tlb, vs others:  */
                if (tlb && !(vaddr & 0x80000000ULL) &&
                    (exccode == EXCEPTION_TLBL || exccode == EXCEPTION_TLBS) )
                        cpu->pc = base + 0x000;
                else
                        cpu->pc = base + 0x080;
                break;
        default:
                /*
                 *  These offsets are according to the MIPS64 manual, but
                 *  should work with R4000 and the rest too (I hope).
                 *
                 *  0x000  TLB refill, if EXL=0
                 *  0x080  64-bit XTLB refill, if EXL=0
                 *  0x100  cache error  (not implemented yet)
                 *  0x180  general exception
                 *  0x200  interrupt (if CAUSE_IV is set)
                 */
                if (tlb && (exccode == EXCEPTION_TLBL ||
                    exccode == EXCEPTION_TLBS) &&
                    !(reg[COP0_STATUS] & STATUS_EXL)) {
                        if (x_64)
                                cpu->pc = base + 0x080;
                        else
                                cpu->pc = base + 0x000;
                } else {
                        if (exccode == EXCEPTION_INT &&
                            (reg[COP0_CAUSE] & CAUSE_IV))
                                cpu->pc = base + 0x200;
                        else
                                cpu->pc = base + 0x180;
                }
        }

        if (exc_model == EXC3K) {
                /*  R{2,3}000:  Shift the lowest 6 bits to the left two steps:*/
                reg[COP0_STATUS] = (reg[COP0_STATUS] & ~0x3f) +
                    ((reg[COP0_STATUS] & 0xf) << 2);
        } else {
                /*  R4000:  */
                reg[COP0_STATUS] |= STATUS_EXL;
        }

        /*  Sign-extend:  */
        reg[COP0_CAUSE] = (int64_t)(int32_t)reg[COP0_CAUSE];
        reg[COP0_STATUS] = (int64_t)(int32_t)reg[COP0_STATUS];

        if (cpu->is_32bit) {
                reg[COP0_EPC] = (int64_t)(int32_t)reg[COP0_EPC];
                mips32_pc_to_pointers(cpu);
        } else {
                mips_pc_to_pointers(cpu);
        }
}


#include "memory_mips.c"


#include "tmp_mips_tail.c"
