src/cpus/cpu_sparc.c

/*
 *  Copyright (C) 2005-2007  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_sparc.c,v 1.42 2007/03/18 02:54:59 debug Exp $
 *
 *  SPARC CPU emulation.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "cpu.h"
#include "machine.h"
#include "memory.h"
#include "misc.h"
#include "settings.h"
#include "symbol.h"


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


static char *sparc_regnames[N_SPARC_REG] = SPARC_REG_NAMES;
static char *sparc_pregnames[N_SPARC_PREG] = SPARC_PREG_NAMES;
static char *sparc_regbranch_names[N_SPARC_REGBRANCH_TYPES] =
        SPARC_REGBRANCH_NAMES;
static char *sparc_branch_names[N_SPARC_BRANCH_TYPES] = SPARC_BRANCH_NAMES;
static char *sparc_alu_names[N_ALU_INSTR_TYPES] = SPARC_ALU_NAMES;
static char *sparc_loadstore_names[N_LOADSTORE_TYPES] = SPARC_LOADSTORE_NAMES;


/*
 *  sparc_cpu_new():
 *
 *  Create a new SPARC cpu object.
 *
 *  Returns 1 on success, 0 if there was no matching SPARC processor with
 *  this cpu_type_name.
 */
int sparc_cpu_new(struct cpu *cpu, struct memory *mem, struct machine *machine,
        int cpu_id, char *cpu_type_name)
{
        int any_cache = 0;
        int i = 0;
        struct sparc_cpu_type_def cpu_type_defs[] = SPARC_CPU_TYPE_DEFS;

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

        cpu->memory_rw = sparc_memory_rw;

        cpu->cd.sparc.cpu_type = cpu_type_defs[i];
        cpu->name              = cpu->cd.sparc.cpu_type.name;
        cpu->byte_order        = EMUL_BIG_ENDIAN;
        cpu->is_32bit = (cpu->cd.sparc.cpu_type.bits == 32)? 1 : 0;

        cpu->instruction_has_delayslot = sparc_cpu_instruction_has_delayslot;

        /*  TODO: Separate this into 64-bit vs 32-bit?  */
        cpu->translate_v2p = sparc_translate_v2p;

        if (cpu->is_32bit) {
                cpu->run_instr = sparc32_run_instr;
                cpu->update_translation_table =
                    sparc32_update_translation_table;
                cpu->invalidate_translation_caches =
                    sparc32_invalidate_translation_caches;
                cpu->invalidate_code_translation =
                    sparc32_invalidate_code_translation;
        } else {
                cpu->run_instr = sparc_run_instr;
                cpu->update_translation_table = sparc_update_translation_table;
                cpu->invalidate_translation_caches =
                    sparc_invalidate_translation_caches;
                cpu->invalidate_code_translation =
                    sparc_invalidate_code_translation;
        }

        /*  Only show name and caches etc for CPU nr 0 (in SMP machines):  */
        if (cpu_id == 0) {
                debug("%s", cpu->name);

                if (cpu->cd.sparc.cpu_type.icache_shift != 0)
                        any_cache = 1;
                if (cpu->cd.sparc.cpu_type.dcache_shift != 0)
                        any_cache = 1;
                if (cpu->cd.sparc.cpu_type.l2cache_shift != 0)
                        any_cache = 1;

                if (any_cache) {
                        debug(" (I+D = %i+%i KB", (int)
                            (1 << (cpu->cd.sparc.cpu_type.icache_shift-10)),
                            (int)(1<<(cpu->cd.sparc.cpu_type.dcache_shift-10)));
                        if (cpu->cd.sparc.cpu_type.l2cache_shift != 0) {
                                debug(", L2 = %i KB",
                                    (int)(1 << (cpu->cd.sparc.cpu_type.
                                    l2cache_shift-10)));
                        }
                        debug(")");
                }
        }

        /*  After a reset, the Tick register is not readable by user code:  */
        cpu->cd.sparc.tick |= SPARC_TICK_NPT;

        /*  Insert number of Windows and Trap levels into the version reg.:  */
        cpu->cd.sparc.ver |= N_REG_WINDOWS | (MAXTL << SPARC_VER_MAXTL_SHIFT);

        /*  Misc. initial settings suitable for userland emulation:  */
        cpu->cd.sparc.cansave = cpu->cd.sparc.cpu_type.nwindows - 2;
        cpu->cd.sparc.canrestore = 0;
        cpu->cd.sparc.cleanwin = 1;
        cpu->cd.sparc.otherwin = 0;

        if (cpu->cd.sparc.cansave + cpu->cd.sparc.canrestore
            + cpu->cd.sparc.otherwin != cpu->cd.sparc.cpu_type.nwindows - 2) {
                fatal("Fatal internal error: inconsistent windowing "
                    "parameters!\n");
                exit(1);
        }

        if (cpu->cd.sparc.cpu_type.nwindows > N_REG_WINDOWS) {
                fatal("Fatal internal error: nwindows = %1 is more than %i\n",
                    cpu->cd.sparc.cpu_type.nwindows, N_REG_WINDOWS);
                exit(1);
        }

        CPU_SETTINGS_ADD_REGISTER64("pc", cpu->pc);
        CPU_SETTINGS_ADD_REGISTER64("y", cpu->cd.sparc.y);
        CPU_SETTINGS_ADD_REGISTER64("pstate", cpu->cd.sparc.pstate);
        for (i=0; i<N_SPARC_REG; i++)
                CPU_SETTINGS_ADD_REGISTER64(sparc_regnames[i],
                    cpu->cd.sparc.r[i]);
        /*  TODO: Handler for writes to the zero register!  */

        return 1;
}


/*
 *  sparc_cpu_list_available_types():
 *
 *  Print a list of available SPARC CPU types.
 */
void sparc_cpu_list_available_types(void)
{
        int i, j;
        struct sparc_cpu_type_def tdefs[] = SPARC_CPU_TYPE_DEFS;

        i = 0;
        while (tdefs[i].name != NULL) {
                debug("%s", tdefs[i].name);
                for (j=16 - strlen(tdefs[i].name); j>0; j--)
                        debug(" ");
                i++;
                if ((i % 4) == 0 || tdefs[i].name == NULL)
                        debug("\n");
        }
}


/*
 *  sparc_cpu_dumpinfo():
 */
void sparc_cpu_dumpinfo(struct cpu *cpu)
{
        debug(", %i-bit\n", cpu->cd.sparc.cpu_type.bits);
}


/*
 *  sparc_cpu_register_dump():
 *
 *  Dump cpu registers in a relatively readable format.
 *
 *  gprs: set to non-zero to dump GPRs and some special-purpose registers.
 *  coprocs: set bit 0..3 to dump registers in coproc 0..3.
 */
void sparc_cpu_register_dump(struct cpu *cpu, int gprs, int coprocs)
{
        char *symbol;
        uint64_t offset;
        int i, x = cpu->cpu_id;
        int bits32 = cpu->is_32bit;

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

                debug("cpu%i: pc = 0x", x);
                if (bits32)
                        debug("%08"PRIx32, (uint32_t) cpu->pc);
                else
                        debug("%016"PRIx64, (uint64_t) cpu->pc);
                debug("  <%s>\n", symbol != NULL? symbol : " no symbol ");

                debug("cpu%i: y  = 0x%08"PRIx32"   ",
                    x, (uint32_t)cpu->cd.sparc.y);
                debug("icc = ");
                debug(cpu->cd.sparc.ccr & SPARC_CCR_N? "N" : "n");
                debug(cpu->cd.sparc.ccr & SPARC_CCR_Z? "Z" : "z");
                debug(cpu->cd.sparc.ccr & SPARC_CCR_V? "V" : "v");
                debug(cpu->cd.sparc.ccr & SPARC_CCR_C? "C" : "c");
                if (!bits32) {
                        debug("  xcc = ");
                        debug((cpu->cd.sparc.ccr >> SPARC_CCR_XCC_SHIFT)
                            & SPARC_CCR_N? "N" : "n");
                        debug((cpu->cd.sparc.ccr >> SPARC_CCR_XCC_SHIFT)
                            & SPARC_CCR_Z? "Z" : "z");
                        debug((cpu->cd.sparc.ccr >> SPARC_CCR_XCC_SHIFT)
                            & SPARC_CCR_V? "V" : "v");
                        debug((cpu->cd.sparc.ccr >> SPARC_CCR_XCC_SHIFT)
                            & SPARC_CCR_C? "C" : "c");
                }
                debug("\n");

                if (bits32)
                        debug("cpu%i: psr = 0x%08"PRIx32"\n",
                            x, (uint32_t) cpu->cd.sparc.psr);
                else
                        debug("cpu%i: pstate = 0x%016"PRIx64"\n",
                            x, (uint64_t) cpu->cd.sparc.pstate);

                if (bits32) {
                        for (i=0; i<N_SPARC_REG; i++) {
                                if ((i & 3) == 0)
                                        debug("cpu%i: ", x);
                                /*  Skip the zero register:  */
                                if (i == SPARC_ZEROREG) {
                                        debug("               ");
                                        continue;
                                }
                                debug("%s=", sparc_regnames[i]);
                                debug("0x%08x", (int) cpu->cd.sparc.r[i]);
                                if ((i & 3) < 3)
                                        debug("  ");
                                else
                                        debug("\n");
                        }
                } else {
                        for (i=0; i<N_SPARC_REG; i++) {
                                int r = ((i >> 1) & 15) | ((i&1) << 4);
                                if ((i & 1) == 0)
                                        debug("cpu%i: ", x);

                                /*  Skip the zero register:  */
                                if (i == SPARC_ZEROREG) {
                                        debug("                         ");
                                        continue;
                                }

                                debug("%s = ", sparc_regnames[r]);
                                debug("0x%016"PRIx64, (uint64_t)
                                    cpu->cd.sparc.r[r]);

                                if ((i & 1) < 1)
                                        debug("  ");
                                else
                                        debug("\n");
                        }
                }
        }

        if (coprocs & 1) {
                int sum;

                debug("cpu%i: cwp        = 0x%02x\n", x, cpu->cd.sparc.cwp);
                debug("cpu%i: cansave    = 0x%02x\n", x, cpu->cd.sparc.cansave);
                debug("cpu%i: canrestore = 0x%02x\n", x,
                    cpu->cd.sparc.canrestore);
                debug("cpu%i: otherwin   = 0x%02x\n", x,
                    cpu->cd.sparc.otherwin);
                debug("cpu%i: cleanwin   = 0x%02x\n", x,
                    cpu->cd.sparc.cleanwin);

                sum = cpu->cd.sparc.cansave + cpu->cd.sparc.canrestore +
                    cpu->cd.sparc.otherwin;
                debug("cpu%i: cansave + canrestore + otherwin = %i + %i + %i"
                    " = %i", x, cpu->cd.sparc.cansave, cpu->cd.sparc.canrestore,
                    cpu->cd.sparc.otherwin, sum);
                if (sum == cpu->cd.sparc.cpu_type.nwindows - 2)
                        debug("  (consistent)\n");
                else
                        debug("  (INCONSISTENT!)\n");

                debug("cpu%i: wstate: other = %i, normal = %i\n",
                    x, (cpu->cd.sparc.wstate & SPARC_WSTATE_OTHER_MASK)
                    >> SPARC_WSTATE_OTHER_SHIFT, cpu->cd.sparc.wstate &
                    SPARC_WSTATE_NORMAL_MASK);

                debug("cpu%i: asi = 0x%02x\n", x, cpu->cd.sparc.asi);
                debug("cpu%i: tl  = 0x%02x\n", x, cpu->cd.sparc.tl);
                debug("cpu%i: pil = 0x%02x\n", x, cpu->cd.sparc.pil);

                for (i=0; i<MAXTL; i++) {
                        debug("cpu%i: tpc[%i]    = 0x", x, i);
                        if (bits32)
                                debug("%08"PRIx32"\n",
                                    (uint32_t) cpu->cd.sparc.tpc[i]);
                        else
                                debug("%016"PRIx64"\n",
                                    (uint64_t) cpu->cd.sparc.tpc[i]);

                        debug("cpu%i: tnpc[%i]   = 0x", x, i);
                        if (bits32)
                                debug("%08"PRIx32"\n",
                                    (uint32_t) cpu->cd.sparc.tnpc[i]);
                        else
                                debug("%016"PRIx64"\n",
                                    (uint64_t) cpu->cd.sparc.tnpc[i]);

                        debug("cpu%i: tstate[%i] = 0x", x, i);
                        if (bits32)
                                debug("%08"PRIx32"\n",
                                    (uint32_t) cpu->cd.sparc.tstate[i]);
                        else
                                debug("%016"PRIx64"\n",
                                    (uint64_t) cpu->cd.sparc.tstate[i]);

                        debug("cpu%i: ttype[%i]  = 0x"PRIx32"\n",
                            x, i, cpu->cd.sparc.ttype[i]);
                }

                debug("cpu%i: tba = 0x", x);
                if (bits32)
                        debug("%08"PRIx32"\n", (uint32_t) cpu->cd.sparc.tba);
                else
                        debug("%016"PRIx64"\n", (uint64_t) cpu->cd.sparc.tba);
        }
}


/*
 *  sparc_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 sparc_cpu_tlbdump(struct machine *m, int x, int rawflag)
{
}


static void add_response_word(struct cpu *cpu, char *r, uint64_t value,
        size_t maxlen, int len)
{
        char *format = (len == 4)? "%08"PRIx64 : "%016"PRIx64;
        if (len == 4)
                value &= 0xffffffffULL;
        if (cpu->byte_order == EMUL_LITTLE_ENDIAN) {
                if (len == 4) {
                        value = ((value & 0xff) << 24) +
                                ((value & 0xff00) << 8) +
                                ((value & 0xff0000) >> 8) +
                                ((value & 0xff000000) >> 24);
                } else {
                        value = ((value & 0xff) << 56) +
                                ((value & 0xff00) << 40) +
                                ((value & 0xff0000) << 24) +
                                ((value & 0xff000000ULL) << 8) +
                                ((value & 0xff00000000ULL) >> 8) +
                                ((value & 0xff0000000000ULL) >> 24) +
                                ((value & 0xff000000000000ULL) >> 40) +
                                ((value & 0xff00000000000000ULL) >> 56);
                }
        }
        snprintf(r + strlen(r), maxlen - strlen(r), format, (uint64_t)value);
}


/*
 *  sparc_cpu_gdb_stub():
 *
 *  Execute a "remote GDB" command. Returns a newly allocated response string
 *  on success, NULL on failure.
 */
char *sparc_cpu_gdb_stub(struct cpu *cpu, char *cmd)
{
        if (strcmp(cmd, "g") == 0) {
                int i;
                char *r;
                size_t wlen = cpu->is_32bit?
                    sizeof(uint32_t) : sizeof(uint64_t);
                size_t len = 1 + 76 * wlen;
                r = malloc(len);
                if (r == NULL) {
                        fprintf(stderr, "out of memory\n");
                        exit(1);
                }
                r[0] = '\0';
                /*  TODO  */
                for (i=0; i<128; i++)
                        add_response_word(cpu, r, i, len, wlen);
                return r;
        }

        if (cmd[0] == 'p') {
                int regnr = strtol(cmd + 1, NULL, 16);
                size_t wlen = sizeof(uint32_t);
                /*  TODO: cpu->is_32bit? sizeof(uint32_t) : sizeof(uint64_t); */
                size_t len = 2 * wlen + 1;
                char *r = malloc(len);
                r[0] = '\0';
                if (regnr >= 0 && regnr < N_SPARC_REG) {
                        add_response_word(cpu, r,
                            cpu->cd.sparc.r[regnr], len, wlen);
                } else if (regnr == 0x44) {
                        add_response_word(cpu, r, cpu->pc, len, wlen);
/* TODO:
20..3f = f0..f31
40 = y
41 = psr
42 = wim
43 = tbr
45 = npc
46 = fsr
47 = csr
*/
                } else {
                        /*  Unimplemented:  */
                        add_response_word(cpu, r, 0xcc000 + regnr, len, wlen);
                }
                return r;
        }

        fatal("sparc_cpu_gdb_stub(): TODO\n");
        return NULL;
}


/*
 *  sparc_cpu_interrupt():
 */
int sparc_cpu_interrupt(struct cpu *cpu, uint64_t irq_nr)
{
        fatal("sparc_cpu_interrupt(): TODO\n");
        return 0;
}


/*
 *  sparc_cpu_interrupt_ack():
 */
int sparc_cpu_interrupt_ack(struct cpu *cpu, uint64_t irq_nr)
{
        /*  fatal("sparc_cpu_interrupt_ack(): TODO\n");  */
        return 0;
}


/*
 *  sparc_cpu_instruction_has_delayslot():
 *
 *  Return 1 if an opcode is a branch, 0 otherwise.
 */
int sparc_cpu_instruction_has_delayslot(struct cpu *cpu, unsigned char *ib)
{
        uint32_t iword = *((uint32_t *)&ib[0]);
        int hi2, op2;

        iword = BE32_TO_HOST(iword);

        hi2 = iword >> 30;
        op2 = (hi2 == 0)? ((iword >> 22) & 7) : ((iword >> 19) & 0x3f);

        switch (hi2) {
        case 0: /*  conditional branch  */
                switch (op2) {
                case 1:
                case 2:
                case 3: return 1;
                }
                break;
        case 1: /*  call  */
                return 1;
        case 2: /*  misc alu instructions  */
                switch (op2) {
                case 56:/*  jump and link  */
                        return 1;
                case 57:/*  return  */
                        return 1;
                }
                break;
        }

        return 0;
}


/*
 *  sparc_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.
 */
int sparc_cpu_disassemble_instr(struct cpu *cpu, unsigned char *instr,
        int running, uint64_t dumpaddr)
{
        uint64_t offset, tmp;
        uint32_t iword;
        int hi2, op2, rd, rs1, rs2, siconst, btype, tmps, no_rd = 0;
        int asi, no_rs1 = 0, no_rs2 = 0, jmpl = 0, shift_x = 0, cc, p;
        char *symbol, *mnem, *rd_name, *rs_name;

        if (running)
                dumpaddr = cpu->pc;

        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);

        iword = *(uint32_t *)&instr[0];
        iword = BE32_TO_HOST(iword);

        debug(": %08x", iword);

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

        debug("\t");


        /*
         *  Decode the instruction:
         *
         *  http://www.cs.unm.edu/~maccabe/classes/341/labman/node9.html is a
         *  good quick description of SPARC instruction encoding.
         */

        hi2 = iword >> 30;
        rd = (iword >> 25) & 31;
        btype = rd & (N_SPARC_BRANCH_TYPES - 1);
        rs1 = (iword >> 14) & 31;
        asi = (iword >> 5) & 0xff;
        rs2 = iword & 31;
        siconst = (int16_t)((iword & 0x1fff) << 3) >> 3;
        op2 = (hi2 == 0)? ((iword >> 22) & 7) : ((iword >> 19) & 0x3f);
        cc = (iword >> 20) & 3;
        p = (iword >> 19) & 1;

        switch (hi2) {

        case 0: switch (op2) {

                case 0: debug("illtrap\t0x%x", iword & 0x3fffff);
                        break;

                case 1:
                case 2:
                case 3: if (op2 == 3)
                                debug("%s", sparc_regbranch_names[btype & 7]);
                        else
                                debug("%s", sparc_branch_names[btype]);
                        if (rd & 16)
                                debug(",a");
                        tmps = iword;
                        switch (op2) {
                        case 1: tmps <<= 13;
                                tmps >>= 11;
                                if (!p)
                                        debug(",pn");
                                debug("\t%%%s,", cc==0 ? "icc" :
                                    (cc==2 ? "xcc" : "UNKNOWN"));
                                break;
                        case 2: tmps <<= 10;
                                tmps >>= 8;
                                debug("\t");
                                break;
                        case 3: if (btype & 8)
                                        debug("(INVALID)");
                                if (!p)
                                        debug(",pn");
                                debug("\t%%%s,", sparc_regnames[rs1]);
                                tmps = ((iword & 0x300000) >> 6)
                                    | (iword & 0x3fff);
                                tmps <<= 16;
                                tmps >>= 14;
                                break;
                        }
                        tmp = (int64_t)(int32_t)tmps;
                        tmp += dumpaddr;
                        debug("0x%"PRIx64, (uint64_t) tmp);
                        symbol = get_symbol_name(&cpu->machine->
                            symbol_context, tmp, &offset);
                        if (symbol != NULL)
                                debug(" \t<%s>", symbol);
                        break;

                case 4: if (rd == 0) {
                                debug("nop");
                                break;
                        }
                        debug("sethi\t%%hi(0x%x),", (iword & 0x3fffff) << 10);
                        debug("%%%s", sparc_regnames[rd]);
                        break;

                default:debug("UNIMPLEMENTED hi2=%i, op2=0x%x", hi2, op2);
                }
                break;

        case 1: tmp = (int32_t)iword << 2;
                tmp += dumpaddr;
                debug("call\t0x%"PRIx64, (uint64_t) tmp);
                symbol = get_symbol_name(&cpu->machine->symbol_context,
                    tmp, &offset);
                if (symbol != NULL)
                        debug(" \t<%s>", symbol);
                break;

        case 2: mnem = sparc_alu_names[op2];
                rs_name = sparc_regnames[rs1];
                rd_name = sparc_regnames[rd];
                switch (op2) {
                case 0: /*  add  */
                        if (rd == rs1 && (iword & 0x3fff) == 0x2001) {
                                mnem = "inc";
                                no_rs1 = no_rs2 = 1;
                        }
                        break;
                case 2: /*  or  */
                        if (rs1 == 0) {
                                mnem = "mov";
                                no_rs1 = 1;
                        }
                        break;
                case 4: /*  sub  */
                        if (rd == rs1 && (iword & 0x3fff) == 0x2001) {
                                mnem = "dec";
                                no_rs1 = no_rs2 = 1;
                        }
                        break;
                case 20:/*  subcc  */
                        if (rd == 0) {
                                mnem = "cmp";
                                no_rd = 1;
                        }
                        break;
                case 37:/*  sll  */
                case 38:/*  srl  */
                case 39:/*  sra  */
                        if (siconst & 0x1000) {
                                siconst &= 0x3f;
                                shift_x = 1;
                        } else
                                siconst &= 0x1f;
                        break;
                case 40:/*  rd on pre-sparcv9, membar etc on sparcv9  */
                        no_rs2 = 1;
                        rs_name = "UNIMPLEMENTED";
                        switch (rs1) {
                        case 0: rs_name = "y"; break;
                        case 2: rs_name = "ccr"; break;
                        case 3: rs_name = "asi"; break;
                        case 4: rs_name = "tick"; break;
                        case 5: rs_name = "pc"; break;
                        case 6: rs_name = "fprs"; break;
                        case 15:/*  membar etc.  */
                                if ((iword >> 13) & 1) {
                                        no_rd = 1;
                                        mnem = "membar";
                                        rs_name = "#TODO";
                                }
                                break;
                        case 23:rs_name = "tick_cmpr"; break;   /*  v9 ?  */
                        }
                        break;
                case 41:rs_name = "psr";
                        no_rs2 = 1;
                        break;
                case 42:/*  TODO: something with wim only, on sparc v8?  */
                        rs_name = sparc_pregnames[rs1];
                        no_rs2 = 1;
                        break;
                case 43:/*  ?  */
                        /*  TODO: pre-sparcv9: rd, rs_name = "tbr";  */
                        if (iword == 0x81580000) {
                                mnem = "flushw";
                                no_rs1 = no_rs2 = no_rd = 1;
                        }
                        break;
                case 48:/*  wr* (SPARCv8)  */
                        mnem = "wr";
                        if (rs1 == SPARC_ZEROREG)
                                no_rs1 = 1;
                        switch (rd) {
                        case 0: rd_name = "y"; break;
                        case 2: rd_name = "ccr"; break;
                        case 3: rd_name = "asi"; break;
                        case 6: rd_name = "fprs"; break;
                        case 23:rd_name = "tick_cmpr"; break;   /*  v9 ?  */
                        default:rd_name = "UNIMPLEMENTED";
                        }
                        break;
                case 49:/*  ?  */
                        if (iword == 0x83880000) {
                                mnem = "restored";
                                no_rs1 = no_rs2 = no_rd = 1;
                        }
                        break;
                case 50:/*  wrpr  */
                        rd_name = sparc_pregnames[rd];
                        if (rs1 == SPARC_ZEROREG)
                                no_rs1 = 1;
                        break;
                case 56:/*  jmpl  */
                        jmpl = 1;
                        if (iword == 0x81c7e008) {
                                mnem = "ret";
                                no_rs1 = no_rs2 = no_rd = 1;
                        }
                        if (iword == 0x81c3e008) {
                                mnem = "retl";
                                no_rs1 = no_rs2 = no_rd = 1;
                        }
                        break;
                case 61:/*  restore  */
                        if (iword == 0x81e80000)
                                no_rs1 = no_rs2 = no_rd = 1;
                        break;
                case 62:if (iword == 0x83f00000) {
                                mnem = "retry";
                                no_rs1 = no_rs2 = no_rd = 1;
                        }
                        break;
                }
                debug("%s", mnem);
                if (shift_x)
                        debug("x");
                debug("\t");
                if (!no_rs1)
                        debug("%%%s", rs_name);
                if (!no_rs1 && !no_rs2) {
                        if (jmpl)
                                debug("+");
                        else
                                debug(",");
                }
                if (!no_rs2) {
                        if ((iword >> 13) & 1) {
                                if (siconst >= -9 && siconst <= 9)
                                        debug("%i", siconst);
                                else if (siconst < 0 && (op2 == 0 ||
                                    op2 == 4 || op2 == 20 || op2 == 60))
                                        debug("-0x%x", -siconst);
                                else
                                        debug("0x%x", siconst);
                        } else {
                                debug("%%%s", sparc_regnames[rs2]);
                        }
                }
                if ((!no_rs1 || !no_rs2) && !no_rd)
                        debug(",");
                if (!no_rd)
                        debug("%%%s", rd_name);
                break;

        case 3: mnem = sparc_loadstore_names[op2];
                switch (op2) {
                case 0: /*  'lduw' was called only 'ld' in pre-v9  */
                        if (cpu->cd.sparc.cpu_type.v < 9)
                                mnem = "ld";
                        break;
                }
                debug("%s\t", mnem);
                if (op2 & 4)
                        debug("%%%s,", sparc_regnames[rd]);
                debug("[%%%s", sparc_regnames[rs1]);
                if ((iword >> 13) & 1) {
                        if (siconst > 0)
                                debug("+");
                        if (siconst != 0)
                                debug("%i", siconst);
                } else {
                        if (rs2 != 0)
                                debug("+%%%s", sparc_regnames[rs2]);
                }
                debug("]");
                if ((op2 & 0x30) == 0x10)
                        debug("(%i)", asi);
                if (!(op2 & 4))
                        debug(",%%%s", sparc_regnames[rd]);
                break;
        }

        debug("\n");
        return sizeof(iword);
}


/*
 *  sparc_update_pstate():
 *
 *  Update the pstate register (64-bit sparcs).
 */
static void sparc_update_pstate(struct cpu *cpu, uint64_t new_pstate)
{
        /*  uint64_t old_pstate = cpu->cd.sparc.pstate;  */

        /*  TODO: Check individual bits.  */

        cpu->cd.sparc.pstate = new_pstate;
}


#include "tmp_sparc_tail.c"
