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[/] [or1k/] [trunk/] [gdb-5.3/] [sim/] [z8k/] [writecode.c] - Blame information for rev 1765

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/* generate instructions for Z8KSIM
 
   Copyright 1992, 1993, 2002 Free Software Foundation, Inc.
 
This file is part of Z8KSIM
 
Z8KSIM is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
 
Z8KSIM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with Z8KZIM; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
/* This program generates the code which emulates each of the z8k
   instructions
 
   code goes into three files, tc-gen1.h, tc-gen2.h and tc-gen3.h.
   which file being made depends upon the options
 
   -1  tc-gen1.h contains the fully expanded code for some selected
       opcodes, (those in the quick.c list)
 
   -2   tc-gen2.h contains a list of pointers to functions, one for each
   opcode.  It points to functions in tc-gen3.h and tc-gen1.h
   depending upon quick.c
 
   -3   tc-gen3.h contains all the opcodes in unexpanded form.
 
   -b3   tc-genb3.h same as -3 but for long pointers
 
   */
 
/* steve chamberlain
   sac@cygnus.com */
 
#include "config.h"
 
#include <ansidecl.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif
 
#define NICENAMES
 
#define DEFINE_TABLE
#include "../opcodes/z8k-opc.h"
 
#define NOPS 500
 
struct opcode_value
{
  int n;
  struct opcode_value *next;
};
 
#define NICENAMES
int BIG;
 
static char *reg_names[] =
{"bad", "src", "dst", "aux_a", "aux_b", "aux_r", "aux_x"};
 
#define IS_DST(x) ((x & 0xf) == 2)
#define IS_SRC(x) ((x & 0xf)==1)
#define SIZE_ADDRESS (BIG ? 8 : 4)      /* number of nibbles in a ptr*/
 
static int file;
 
static int nibs = 0;
 
static char *current_size;
static char *current_name;
static char current_word0[40];
static char current_byte0[40];
static char current_byte1[40];
static int indent;
static char *p;
static char *d;
 
struct opcode_value *list[NOPS];
 
static opcode_entry_type *
lookup_inst (what)
     int what;
{
  static short *z8k_inv_list = NULL;
  const nr_z8k_inv_list_elements = 1 << 16;
  if (z8k_inv_list == NULL)
    {
      /* Initialize the list to 0xff == -1 */
      z8k_inv_list = calloc (nr_z8k_inv_list_elements, sizeof (short));
      memset (z8k_inv_list, 0xff, nr_z8k_inv_list_elements * sizeof (short));
    }
  /* Entry empty? Fill it in.  */
  if (z8k_inv_list[what] == -1)
    {
 
      int nibl_index;
      int nibl_matched;
      unsigned short instr_nibl;
      unsigned short tabl_datum, datum_class, datum_value;
      char instr_nibbles[8];
 
      opcode_entry_type *ptr = z8k_table;
 
      nibl_matched = 0;
 
      instr_nibbles[3] = (what >> 0) & 0xf;
      instr_nibbles[2] = (what >> 4) & 0xf;
      instr_nibbles[1] = (what >> 8) & 0xf;
      instr_nibbles[0] = (what >> 12) & 0xf;
 
      /* Assume it won't be found.  */
      z8k_inv_list[what] = -2;
 
      while (ptr->name)
        {
          nibl_matched = 1;
          for (nibl_index = 0; nibl_index < 4 && nibl_matched; nibl_index++)
            {
              instr_nibl = instr_nibbles[nibl_index];
 
              tabl_datum = ptr->byte_info[nibl_index];
              datum_class = tabl_datum & CLASS_MASK;
              datum_value = ~CLASS_MASK & tabl_datum;
 
              switch (datum_class)
                {
                case CLASS_BIT_1OR2:
                  if (datum_value != (instr_nibl & ~0x2))
                    nibl_matched = 0;
                  break;
 
                case CLASS_IGNORE:
                  break;
                case CLASS_BIT:
                  if (datum_value != instr_nibl)
                    nibl_matched = 0;
                  break;
                case CLASS_00II:
                  if (!((~instr_nibl) & 0x4))
                    nibl_matched = 0;
                  break;
                case CLASS_01II:
                  if (!(instr_nibl & 0x4))
                    nibl_matched = 0;
                  break;
                case CLASS_0CCC:
                  if (!((~instr_nibl) & 0x8))
                    nibl_matched = 0;
                  break;
                case CLASS_1CCC:
                  if (!(instr_nibl & 0x8))
                    nibl_matched = 0;
                  break;
                case CLASS_0DISP7:
                  if (!((~instr_nibl) & 0x8))
                    nibl_matched = 0;
                  nibl_index += 1;
                  break;
                case CLASS_1DISP7:
                  if (!(instr_nibl & 0x8))
                    nibl_matched = 0;
                  nibl_index += 1;
                  break;
                case CLASS_REGN0:
                  if (instr_nibl == 0)
                    nibl_matched = 0;
                  break;
                default:
                  break;
                }
            }
          if (nibl_matched)
            {
              z8k_inv_list[what] = ptr->idx;
              break; /* while */
            }
          ptr++;
        }
    }
  if (z8k_inv_list[what] >= 0)
    return z8k_table + z8k_inv_list[what];
  return 0;
}
 
static char *
insn_4 (n)
     int n;
{
  switch (n)
    {
    case 1:
      return "((iwords_0>>8) & 0xf)";
    case 2:
      return "((ibytes_1 >> 4) & 0xf)";
    case 3:
      return "((ibytes_1) & 0xf)";
    case 4:
      return "((ibytes_2>>4) & 0xf)";
    case 5:
      return "((ibytes_2) & 0xf)";
    case 6:
      return "((ibytes_3 >> 4) & 0xf)";
    case 7:
      return "((ibytes_3) & 0xf)";
    default:
      return "****";
    }
}
 
char *
ptr_mode ()
{
  if (BIG)
    {
      return "ptr_long";
    }
  return "word";
}
 
static
char *
ptr_size ()
{
  if (BIG)
    return "4";
  return "2";
}
 
static char *
reg_n (x)
     unsigned int x;
{
  return reg_names[x & 0xf];
}
 
char *
stack_ptr ()
{
  return BIG ? "14" : "15";
}
 
char *
mem ()
{
#if 0
  return BIG ? "segmem" : "unsegmem";
#else
  return "mem";
#endif
}
 
int
match (a)
     char *a;
{
  if (strncmp (p, a, strlen (a)) == 0)
    {
      p += strlen (a);
      return 1;
    }
  return 0;
}
 
static
void
sub (y)
     char *y;
{
  sprintf (d, "%s", y);
  d += strlen (d);
}
 
static char *
insn_16 (n)
     int n;
{
  switch (n)
    {
    case 0:
      return "(iwords_0)";
    case 4:
      return "(iwords_1)";
    case 8:
      return "(iwords_2)";
    case 12:
      return "(iwords_3)";
    default:
      return "****";
    }
}
 
static
char *
insn_32 (n)
     int n;
{
  switch (n)
    {
    case 0:
      return "((iwords_0<<16) | (iwords_1))";
    case 4:
      return "((iwords_1<<16) | (iwords_2))";
    case 8:
      return "((iwords_2<<16) | (iwords_3))";
    default:
      return "****";
    }
}
 
static char *
size_name (x)
     int x;
{
  switch (x)
    {
    case 8:
      return "byte";
    case 16:
      return "word";
    case 32:
      return "long";
    case 64:
      return "quad";
    }
  return "!!";
}
 
/*VARARGS*/
void
emit (string, a1, a2, a3, a4, a5)
     char *string;
     char* a1;
     char* a2;
     char* a3;
     char* a4;
     char* a5;
{
  int indent_inc = 0;
  int indent_dec = 0;
  int i;
  char buffer[1000];
 
  d = buffer;
  p = string;
 
  while (*p)
    {
      if (match ("<fop>"))
        {
          if (BIG)
            {
              sub ("bfop");
            }
          else
            {
              sub ("sfop");
            }
        }
      else if (match ("<iptr>"))
        {
          if (BIG)
            {
              switch (nibs)
                {
                case 4:
                  sub ("(((iwords_1 << 8) | (iwords_2)) & 0x7fffff)");
                  break;
                default:
                  sub ("fail(context,124)");
                  break;
                }
            }
          else
            {
              switch (nibs)
                {
                case 4:
                  sub ("iwords_1");
                  break;
                default:
                  sub ("fail(context,123)");
                  break;
                }
            }
        }
      else if (match ("<name>"))
        {
          sub (current_name);
        }
      else if (match ("<size>"))
        {
          sub (current_size);
        }
      else if (match ("<insn_4>"))
        {
          sub (insn_4 (nibs));
        }
      else if (match ("<insn_16>"))
        {
          sub (insn_16 (nibs));
        }
      else if (match ("<insn_32>"))
        {
          sub (insn_32 (nibs));
        }
      else if (match ("iwords_0"))
        {
          sub (current_word0);
        }
      else if (match ("ibytes_0"))
        {
          sub (current_byte0);
        }
      else if (match ("<ibytes_1>"))
        {
          sub (current_byte1);
        }
      else if (match ("<next_size>"))
        {
          if (strcmp (current_size, "word") == 0)
            sub ("long");
          if (strcmp (current_size, "byte") == 0)
            sub ("word");
          else if (strcmp (current_size, "long") == 0)
            sub ("quad");
          else
            abort ();
        }
      else if (match ("<addr_type>"))
        {
          if (BIG)
            sub ("unsigned long");
          else
            sub ("unsigned short");
        }
 
      else if (match ("<c_size>"))
        {
          if (strcmp (current_size, "word") == 0)
            sub ("short");
          else if (strcmp (current_size, "byte") == 0)
            sub ("char");
          else if (strcmp (current_size, "long") == 0)
            sub ("long");
          else
            abort ();
        }
 
      else if (match ("<pc>"))
        {
          sub ("pc");
        }
      else if (match ("<mem>"))
        {
          sub (mem ());
        }
      else if (match ("<sp>"))
        {
          sub (stack_ptr ());
        }
      else if (match ("<ptr_size>"))
        {
          sub (ptr_size ());
        }
      else if (match ("<ptr_mode>"))
        {
          sub (ptr_mode ());
        }
      else if (match ("<insn_8>"))
        {
          switch (nibs)
            {
            case 2:
              sub ("(iwords_0&0xff)");
              break;
            case 4:
              sub ("(iwords_1>>8)");
              break;
            case 6:
              sub ("(iwords_1&0xff)");
              break;
            case 8:
              sub ("(iwords_2>>8)");
              break;
            case 12:
              sub ("(/* WHO */iwords_3&0xff)");
              break;
            default:
              abort ();
            }
        }
      else
        {
          if (*p == '{')
            indent_inc++;
          if (*p == '}')
            indent_dec++;
          *d++ = *p;
          p++;
        }
    }
  *d++ = 0;
  indent -= indent_dec;
  for (i = 0; i < indent; i++)
    printf ("\t");
  indent += indent_inc;
  printf (buffer, a1, a2, a3, a4, a5);
 
}
 
/* fetch the lvalues of the operands */
void
info_args (p)
     opcode_entry_type *p;
{
  unsigned int *s;
 
  int done_one_imm8 = 0;
 
  /* int done_read = 4;*/
  s = p->byte_info;
  nibs = 0;
  while (*s)
    {
      switch (*s & CLASS_MASK)
        {
        case CLASS_BIT_1OR2:
          emit ("register unsigned int imm_src=(<insn_4>& 2)?2:1;\n");
          break;
        case CLASS_IGNORE:
        case CLASS_BIT:
          /* Just ignore these, we've already decoded this bit */
          nibs++;
          break;
        case CLASS_REGN0:
        case CLASS_REG:
          /* this nibble tells us which register to use as an arg,
             if we've already gobbled the nibble we know what to use */
          {
            int regname = *s & 0xf;
 
            emit ("register unsigned int reg_%s=<insn_4>;\n",
                  reg_names[regname]);
 
            nibs++;
          }
          break;
        case CLASS_ADDRESS:
          emit ("register unsigned base_%s=<iptr>;\n", reg_n (*s));
 
          nibs += SIZE_ADDRESS;
 
          break;
        case CLASS_01II:
        case CLASS_00II:
          emit ("register unsigned int imm_src=<insn_4>&0x2;\n");
          nibs++;
          break;
        case CLASS_FLAGS:
                emit ("register unsigned int imm_src=<insn_4>;\n");
                nibs++;
break;
        case CLASS_IMM:
          /* Work out the size of the think to fetch */
 
          {
            switch (*s & ~CLASS_MASK)
              {
              case ARG_IMM16:
                emit ("register unsigned imm_src=<insn_16>;\n");
                nibs += 4;
                break;
              case ARG_IMM32:
                emit ("register unsigned int imm_src= %s;\n", insn_32 (nibs));
                nibs += 8;
                break;
              case ARG_IMM4:
                emit ("register unsigned int imm_src=<insn_4>;\n");
                nibs++;
                break;
              case ARG_NIM4:
                emit ("register unsigned int imm_src = - <insn_4>;\n");
                nibs++;
                break;
              case ARG_IMM2:
                emit ("register unsigned int imm_src=<insn_4> & 0x2;\n");
                nibs++;
                break;
 
              case ARG_IMM4M1:
                emit ("register unsigned int imm_src=(<insn_4> + 1);\n");
                nibs++;
                break;
              case ARG_IMM_1:
                emit ("register unsigned int imm_src=1;\n");
                break;
              case ARG_IMM_2:
                emit ("register unsigned int imm_src=2;\n");
                break;
              case ARG_NIM8:
                emit ("register unsigned int imm_src=-<insn_8>;\n");
                nibs += 2;
                break;
              case ARG_IMM8:
                if (!done_one_imm8)
                  {
                    emit ("register unsigned int imm_src=<insn_8>;\n");
                    nibs += 2;
                    done_one_imm8 = 1;
                  }
                break;
              default:
                emit ("register int fail%d=fail(context,1);\n", nibs);
                break;
              }
            break;
 
        case CLASS_DISP8:
            /* We can't use `(char)' since char might be unsigned.
               We can't use `(signed char)' because the compiler might be K&R.
               This seems safe, since it only assumes that bytes are 8
               bits.  */
            emit ("register unsigned int oplval_dst=((ibytes_1 << (sizeof (int) * 8 - 8)) >> (sizeof (int) * 8 - 9)) + pc;\n");
#if 0
            /* Original code: fails if characters are unsigned.  */
            emit ("register unsigned int oplval_dst=(((char)ibytes_1)<<1) + pc;\n");
#endif
            nibs += 2;
            break;
        case CLASS_CC:
            emit ("register unsigned int op_cc=<insn_4>;\n");
            nibs++;
            break;
        default:
            emit ("register int FAIL%d=fail(context,2);\n", nibs);
            break;
          }
          ;
          /* work out how to fetch the immediate value */
        }
 
      s++;
    }
}
 
void
info_special (p, getdst, nostore, before, nosrc)
     opcode_entry_type *p;
     int *getdst;
     int *nostore;
     int *before;
     int *nosrc;
{
  switch (p->opcode)
    {
    case OPC_exts:
    case OPC_extsb:
    case OPC_extsl:
      *nostore = 1;
      *nosrc = 1;
      break;
    case OPC_ldm:
      *nostore = 1;
      *nosrc = 1;
      break;
    case OPC_negb:
    case OPC_neg:
    case OPC_sla:
    case OPC_slab:
    case OPC_slal:
    case OPC_sda:
    case OPC_sdab:
    case OPC_sdal:
    case OPC_com:
    case OPC_comb:
    case OPC_adc:
    case OPC_sbc:
    case OPC_nop:
    case OPC_adcb:
    case OPC_add:
    case OPC_addb:
    case OPC_addl:
    case OPC_inc:
    case OPC_sub:
    case OPC_subb:
    case OPC_subl:
    case OPC_and:
    case OPC_andb:
    case OPC_xorb:
    case OPC_xor:
      break;
 
    case OPC_mult:
    case OPC_multl:
    case OPC_div:
    case OPC_divl:
 
      *nostore = 1;
      break;
 
    case OPC_testb:
    case OPC_test:
    case OPC_testl:
    case OPC_cp:
    case OPC_cpb:
    case OPC_cpl:
    case OPC_bit:
      *nostore = 1;
      *before = 0;
      break;
 
    case OPC_bpt:
    case OPC_jr:
    case OPC_jp:
    case OPC_ret:
    case OPC_call:
    case OPC_tcc:
      *nosrc = 1;
      *nostore = 1;
      *before = 1;
      break;
    case OPC_sc:
      *nostore = 1;
      *before = 0;
      break;
    case OPC_clrb:
    case OPC_clr:
      *before = 1;
      *nosrc = 1;
      break;
    case OPC_ldi:
    case OPC_ldib:
    case OPC_lddb:
    case OPC_ldd:
 
      *before = 1;
      *nostore = 1;
      *nosrc = 1;
      break;
    case OPC_ldk:
    case OPC_ld:
    case OPC_ldb:
    case OPC_ldl:
      *before = 1;
      *getdst = 0;
      break;
    case OPC_push:
    case OPC_pushl:
    case OPC_pop:
    case OPC_popl:
      *before = 1;
      *getdst = 0;
      break;
    case OPC_lda:
      *nosrc = 1;
      break;
    }
}
 
/* calculate the lvalues required for the opcode */
void
info_lvals (p)
     opcode_entry_type *p;
{
  /* emit code to work out lvalues, if any */
  unsigned int *i = p->arg_info;
 
  while (*i)
    {
      current_name = reg_n (*i);
      current_size = size_name (p->type);
      switch (*i & CLASS_MASK)
        {
        case CLASS_X:
          /* address(reg) */
          emit ("register  <addr_type> oplval_<name>= ((base_<name> + (short)get_word_reg(context,reg_<name>)) & 0xffff) + (base_<name> & ~0xffff);\n");
          break;
        case CLASS_IR:
          /* Indirect register */
          emit ("register  int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>);\n");
          break;
        case CLASS_DA:
          emit ("register  int oplval_<name>=base_<name>;\n");
          break;
        case CLASS_IMM:
        case CLASS_REG_WORD:
        case CLASS_REG_LONG:
        case CLASS_REG_BYTE:
        case CLASS_PR:
          break;
        case CLASS_BA:
          emit ("register  int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>) + (short)(imm_src);\n");
          break;
        case CLASS_BX:
          emit ("register  int oplval_<name> = get_<ptr_mode>_reg(context,reg_<name>)\n");
          emit ("  + get_word_reg(context,reg_aux_x);\n");
          break;
        }
      i++;
    }
}
 
/* emit code to fetch the args from calculated lvalues */
int allregs;
void
info_fetch (p, getdst)
     opcode_entry_type *p;
     int getdst;
{
  unsigned int *i = p->arg_info;
  int had_src = 0;
 
  allregs = 1;
  while (*i)
    {
 
      current_name = reg_n (*i);
      current_size = size_name (p->type);
      switch (*i & CLASS_MASK)
        {
        case CLASS_X:
        case CLASS_IR:
        case CLASS_BA:
        case CLASS_BX:
        case CLASS_DA:
          if (!getdst && IS_DST (*i))
            break;
          emit ("register int op_<name>= get_<size>_<mem>_da(context,oplval_<name>);\n");
          allregs = 0;
          break;
        case CLASS_IMM:
          if (!had_src)
            {
              if (p->opcode == OPC_out ||
                  p->opcode == OPC_outb ||
                  p->opcode == OPC_sout ||
                  p->opcode == OPC_soutb)
                {
                  /* The imm is a dest here */
                  emit ("register int op_dst = imm_src;\n");
                }
              else
                {
                  emit ("register int op_src = imm_src;\n");
                }
            }
          break;
        case CLASS_REG_QUAD:
          if (!getdst && IS_DST (*i))
            break;
          had_src |= IS_SRC (*i);
          emit ("UDItype op_<name> ;\n");
 
          break;
        case CLASS_REG_WORD:
          if (!getdst && IS_DST (*i))
            break;
          had_src |= IS_SRC (*i);
          emit ("register int op_<name> = get_word_reg(context,reg_<name>);\n");
          break;
 
        case CLASS_REG_LONG:
          if (!getdst && IS_DST (*i))
            break;
          had_src |= IS_SRC (*i);
          emit ("register int op_<name> = get_long_reg(context,reg_<name>);\n");
          break;
        case CLASS_REG_BYTE:
          if (!getdst && IS_DST (*i))
            break;
          had_src |= IS_SRC (*i);
          emit ("register int op_<name> = get_byte_reg(context,reg_<name>);\n");
          break;
        }
      i++;
    }
}
 
static void
normal_flags (p, s, neg)
     opcode_entry_type *p;
     char *s;
{
  emit (" %s;\n", s);
  emit ("NORMAL_FLAGS(context,%d, tmp,  op_dst, op_src,%d); \n", p->type,neg);
}
 
static void
test_normal_flags (p, s, opt)
     opcode_entry_type *p;
     char *s;
     int opt;
{
  emit (" %s;\n", s);
  if (0 && opt)
    {
      emit ("context->broken_flags = TST_FLAGS;\n");
      emit ("context->size = %d;\n", p->type);
    }
  else
    {
      emit ("TEST_NORMAL_FLAGS(context,%d, tmp); \n", p->type);
    }
 
}
 
static void
optimize_normal_flags (p, s,neg)
     opcode_entry_type *p;
     char *s;
{
  emit (" %s;\n", s);
#if 0
  emit ("context->broken_flags = CMP_FLAGS;\n");
#else
  emit ("NORMAL_FLAGS(context,%d, tmp,  op_dst, op_src,%d); \n", p->type, neg);
#endif
}
 
static
void
jp (p)
     opcode_entry_type *p;
{
 
  emit ("if(op_cc == 8 || COND(context,op_cc)) pc = oplval_dst;\n");
}
 
static void
jr (p)
     opcode_entry_type *p;
{
  emit ("if(op_cc == 8 || COND(context,op_cc)) pc = oplval_dst;\n");
}
 
static void
ret (p)
     opcode_entry_type *p;
{
  emit ("if(op_cc == 8 || COND(context,op_cc))\n{\n");
  emit ("pc = get_<ptr_mode>_<mem>_ir(context,<sp>);\n");
  emit ("put_<ptr_mode>_reg(context,<sp>, get_<ptr_mode>_reg(context,<sp>) + <ptr_size>);\n");
  emit ("};\n");
}
 
static void
call (p)
     opcode_entry_type *p;
{
  emit ("put_<ptr_mode>_reg(context,<sp>,tmp =  get_<ptr_mode>_reg(context,<sp>) - <ptr_size>);\n");
  emit ("put_<ptr_mode>_<mem>_da(context,tmp, pc);\n");
  emit ("pc = oplval_dst;\n");
}
 
static void
push (p)
     opcode_entry_type *p;
{
  emit ("tmp = op_src;\n");
  emit ("oplval_dst -= %d;\n", p->type / 8);
  emit ("put_<ptr_mode>_reg(context,reg_dst, oplval_dst);\n");
}
 
static void
pop (p)
     opcode_entry_type *p;
{
  emit ("tmp = op_src;\n");
  emit ("put_<ptr_mode>_reg(context,reg_src, oplval_src + %d);\n", p->type / 8);
}
 
static void
ld (p)
     opcode_entry_type *p;
{
  emit ("tmp = op_src;\n");
}
 
static void
sc ()
{
  emit ("support_call(context,imm_src);\n");
}
 
static void
bpt ()
{
  emit ("pc -=2; \n");
  emit ("context->exception = SIM_BREAKPOINT;\n");
}
 
static void
ldi (p, size, inc)
     opcode_entry_type *p;
     int size;
     int inc;
{
  int dinc = (size / 8) * inc;
 
  current_size = size_name (size);
  emit ("{ \n");
  emit ("int type = %s;\n", insn_4 (7));
  emit ("int rs = get_<ptr_mode>_reg(context,reg_src);\n");
  emit ("int rd = get_<ptr_mode>_reg(context,reg_dst);\n");
  emit ("int rr = get_word_reg(context,reg_aux_r);\n");
  emit ("do {\n");
  emit ("put_<size>_<mem>_da(context,rd, get_<size>_<mem>_da(context,rs));\n");
  emit ("rd += %d;\n", dinc);
  emit ("rs += %d;\n", dinc);
  emit ("rr --;\n");
  emit ("context->cycles += 9;\n");
  emit ("} while (!type && rr != 0 && context->exception <= 1);\n");
  emit ("if (context->exception>1) pc -=4;\n");
  emit ("put_<ptr_mode>_reg(context,reg_src, rs);\n");
  emit ("put_<ptr_mode>_reg(context,reg_dst, rd);\n");
  emit ("put_word_reg(context,reg_aux_r, rr);\n");
  emit ("}\n");
 
}
 
static void
shift (p, arith)
     opcode_entry_type *p;
     int arith;
{
 
  /* We can't use `(char)' since char might be unsigned.
     We can't use `(signed char)' because the compiler might be K&R.
     This seems safe, since it only assumes that bytes are 8 bits.  */
  emit ("op_src = (op_src << (sizeof (int) * 8 - 8)) >> (sizeof (int) * 8 - 8);\n");
#if 0
  /* Original code: fails if characters are unsigned.  */
  emit ("op_src = (char)op_src;\n");
#endif
  emit ("if (op_src < 0) \n");
  emit ("{\n");
  emit ("op_src = -op_src;\n");
  emit ("op_dst = (%s <c_size>)op_dst;\n", arith ? "" : "unsigned");
  emit ("tmp = (%s op_dst) >> op_src;\n", arith ? "" : "(unsigned)");
  emit ("context->carry = op_dst >> (op_src-1);\n", p->type);
  emit ("}\n");
  emit ("else\n");
  emit ("{\n");
  emit ("tmp = op_dst << op_src;\n");
  emit ("context->carry = op_dst >> (%d - op_src);\n", p->type);
  emit ("}\n");
  emit ("context->zero = (<c_size>)tmp == 0;\n");
  emit ("context->sign = (int)((<c_size>)tmp) < 0;\n");
  emit ("context->overflow = ((int)tmp < 0) != ((int)op_dst < 0);\n");
  emit ("context->cycles += 3*op_src;\n");
  emit ("context->broken_flags = 0;\n");
 
}
 
static void
rotate (p, through_carry, size, left)
     opcode_entry_type *p;
     int through_carry;
     int size;
     int left;
{
 
  if (!left)
    {
      emit ("while (op_src--) {\n");
      emit ("int rotbit;\n");
      emit ("rotbit = op_dst & 1;\n");
      emit ("op_dst = ((unsigned)op_dst) >> 1;\n");
 
      if (through_carry)
        {
          emit ("op_dst |= context->carry << %d;\n", size - 1);
        }
      else
        {
          emit ("op_dst |= rotbit << %d;\n", size - 1);
        }
      emit ("context->carry = rotbit;\n");
      emit ("}\n");
    }
  else
    {
      emit ("while (op_src--) {\n");
      emit ("int rotbit;\n");
 
      emit ("rotbit = (op_dst >> (%d))&1;\n", size - 1);
      emit ("op_dst <<=1;\n");
      if (through_carry)
        {
          emit ("if (context->carry) op_dst |=1;\n");
        }
      else
        {
          emit ("if (rotbit) op_dst |= 1;\n");
        }
      emit ("context->carry = rotbit;\n");
      emit ("}\n");
    }
  emit ("tmp = (<c_size>)op_dst;\n");
  emit ("context->zero = tmp == 0;\n");
  emit ("context->sign = (int)tmp < 0;\n");
  emit ("context->overflow = ((int)tmp < 0) != ((int)op_dst < 0);\n");
  emit ("context->cycles += 3*op_src;\n");
  emit ("context->broken_flags = 0;\n");
 
}
 
static void
adiv (p)
     opcode_entry_type *p;
{
  emit ("if (op_src==0)\n");
  emit ("{\n");
  emit ("context->exception = SIM_DIV_ZERO;\n");
  emit ("}\n");
  emit ("else\n");
  emit ("{\n");
 
  if (p->type == 32)
    {
      emit ("op_dst.low = (int)get_long_reg(context,reg_dst+2);\n");
      emit ("op_dst.high = (int)get_long_reg(context,reg_dst+0);\n");
#ifdef __GNUC__
      emit ("tmp = (((long long)op_dst.high << 32) + (op_dst.low)) / (int)op_src;\n");
#else
      emit ("tmp = (long)op_dst.low / (int)op_src;\n");
#endif
      emit ("put_long_reg(context,reg_dst+2, tmp);\n");
#ifdef __GNUC__
      emit ("put_long_reg(context,reg_dst, (((long long)op_dst.high << 32) + (op_dst.low)) %% (int)op_src);\n");
#else
      emit ("put_long_reg(context,reg_dst, (int)op_dst.low %% (int)op_src);\n");
#endif
 
      emit ("context->zero = op_src == 0 || (op_dst.low==0 && op_dst.high==0);\n");
    }
  else
    {
      emit ("tmp = (long)op_dst / (short)op_src;\n");
      emit ("put_word_reg(context,reg_dst+1, tmp);\n");
      emit ("put_word_reg(context,reg_dst, (long) op_dst %% (short)op_src);\n");
      emit ("context->zero = op_src == 0 || op_dst==0;\n");
    }
 
  emit ("context->sign = (int)tmp < 0;\n");
  emit ("context->overflow =(tmp & 0x%x) != 0;\n",
        ~((1 << (p->type)) - 1));
  emit ("context->carry = (tmp & 0x%x) != 0;\n",
        ~(1 << (p->type)));
 
  emit ("}\n");
}
 
static void
dobit (p)
opcode_entry_type *p;
{
  emit("context->zero = (op_dst & (1<<op_src))==0;\n");
  emit("context->broken_flags = 0;\n");
}
static void
doset (p, v)
opcode_entry_type*p;
int v;
{
  if (v)
    emit (" tmp = op_dst | (1<< op_src);\n");
  else
    emit (" tmp = op_dst & ~(1<< op_src);\n");
}
 
static void
mult (p)
     opcode_entry_type *p;
{
 
  if (p->type == 32)
    {
      emit ("op_dst.low =  get_long_reg(context,reg_dst+2);\n");
      emit ("tmp = op_dst.low * op_src;\n");
      emit ("put_long_reg(context,reg_dst+2, tmp);\n");
      emit ("put_long_reg(context,reg_dst, 0);\n");
    }
  else
    {
      emit ("op_dst =  get_word_reg(context,reg_dst+1);\n");
      emit ("tmp = op_dst * op_src;\n");
      emit ("put_long_reg(context,reg_dst, tmp);\n");
    }
 
  emit ("context->sign = (int)tmp < 0;\n");
  emit ("context->overflow =0;\n");
  emit ("context->carry = (tmp & 0x%x) != 0;\n", ~((1 << (p->type)) - 1));
  emit ("context->zero = tmp == 0;\n");
 
}
 
static void
exts (p)
     opcode_entry_type *p;
{
  /* Fetch the ls part of the src */
  current_size = size_name (p->type * 2);
 
  if (p->type == 32)
    {
      emit ("tmp= get_long_reg(context,reg_dst+2);\n");
      emit ("if (tmp & (1<<%d)) {\n", p->type - 1);
      emit ("put_long_reg(context,reg_dst, 0xffffffff);\n");
      emit ("}\n");
      emit ("else\n");
      emit ("{\n");
      emit ("put_long_reg(context,reg_dst, 0);\n");
      emit ("}\n");
    }
  else
    {
      emit ("tmp= get_<size>_reg(context,reg_dst);\n");
      emit ("if (tmp & (1<<%d)) {\n", p->type - 1);
      emit ("tmp |= 0x%x;\n", ~((1 << p->type) - 1));
      emit ("}\n");
      emit ("else\n");
      emit ("{\n");
 
      emit ("tmp &= 0x%x;\n", ((1 << p->type) - 1));
      emit ("}\n");
      emit ("put_<size>_reg(context,reg_dst, tmp);\n");
    }
}
doflag(on)
int on;
{
  /* Load up the flags */
  emit(" COND (context, 0x0b);\n");
 
  if (on)
    emit ("{ int on =1;\n ");
  else
    emit ("{ int on =0;\n ");
 
  emit ("if (imm_src & 1)\n");
  emit ("PSW_OVERFLOW = on;\n");
 
  emit ("if (imm_src & 2)\n");
  emit ("PSW_SIGN = on;\n");
 
  emit ("if (imm_src & 4)\n");
  emit ("PSW_ZERO = on;\n");
 
  emit ("if (imm_src & 8)\n");
  emit ("PSW_CARRY = on;\n");
  emit("}\n");
 
 
}
/* emit code to perform operation */
void
info_docode (p)
     opcode_entry_type *p;
{
  switch (p->opcode)
    {
    case OPC_clr:
    case OPC_clrb:
      emit ("tmp = 0;\n");
      break;
    case OPC_ex:
    case OPC_exb:
 
      emit ("tmp = op_src; \n");
      if (allregs)
        {
          emit ("put_<size>_reg(context,reg_src, op_dst);\n");
        }
      else
        {
          emit ("put_<size>_mem_da(context, oplval_src, op_dst);\n");
        }
      break;
    case OPC_adc:
    case OPC_adcb:
      normal_flags (p, "op_src += COND(context,7);tmp = op_dst + op_src ;",0);
      break;
    case OPC_sbc:
      normal_flags (p, "op_src +=  COND(context,7);tmp = op_dst - op_src ;",1);
      break;
    case OPC_nop:
      break;
    case OPC_com:
    case OPC_comb:
      test_normal_flags (p, "tmp = ~ op_dst", 1);
      break;
    case OPC_and:
    case OPC_andb:
      test_normal_flags (p, "tmp = op_dst & op_src", 1);
      break;
    case OPC_xor:
    case OPC_xorb:
      test_normal_flags (p, "tmp = op_dst ^ op_src", 1);
      break;
    case OPC_or:
    case OPC_orb:
      test_normal_flags (p, "tmp = op_dst | op_src", 1);
      break;
    case OPC_sla:
    case OPC_slab:
    case OPC_slal:
    case OPC_sda:
    case OPC_sdab:
    case OPC_sdal:
      shift (p, 1);
      break;
 
    case OPC_sll:
    case OPC_sllb:
    case OPC_slll:
    case OPC_sdl:
    case OPC_sdlb:
    case OPC_sdll:
      shift (p, 0);
      break;
    case OPC_rl:
      rotate (p, 0, 16, 1);
      break;
    case OPC_rlb:
      rotate (p, 0, 8, 1);
      break;
    case OPC_rr:
      rotate (p, 0, 16, 0);
      break;
    case OPC_rrb:
      rotate (p, 0, 8, 0);
      break;
    case OPC_rrc:
      rotate (p, 1, 16, 0);
      break;
    case OPC_rrcb:
      rotate (p, 1, 8, 0);
      break;
    case OPC_rlc:
      rotate (p, 1, 16, 1);
      break;
    case OPC_rlcb:
      rotate (p, 1, 8, 1);
      break;
 
    case OPC_extsb:
    case OPC_exts:
    case OPC_extsl:
      exts (p);
      break;
    case OPC_add:
    case OPC_addb:
    case OPC_addl:
    case OPC_inc:
    case OPC_incb:
      optimize_normal_flags (p, "tmp = op_dst + op_src",0);
      break;
    case OPC_testb:
    case OPC_test:
    case OPC_testl:
      test_normal_flags (p, "tmp = op_dst", 0);
      break;
    case OPC_cp:
    case OPC_cpb:
    case OPC_cpl:
      normal_flags (p, "tmp = op_dst - op_src",1);
      break;
    case OPC_negb:
    case OPC_neg:
      emit ("{\n");
      emit ("int op_src = -op_dst;\n");
      emit ("op_dst = 0;\n");
      optimize_normal_flags (p, "tmp = op_dst + op_src;\n",1);
      emit ("}");
      break;
 
    case OPC_sub:
    case OPC_subb:
    case OPC_subl:
    case OPC_dec:
    case OPC_decb:
      optimize_normal_flags (p, "tmp = op_dst - op_src",1);
      break;
    case OPC_bpt:
      bpt ();
      break;
    case OPC_jr:
      jr (p);
      break;
    case OPC_sc:
      sc ();
      break;
    case OPC_jp:
      jp (p);
      break;
    case OPC_ret:
      ret (p);
      break;
    case OPC_call:
      call (p);
      break;
    case OPC_tcc:
    case OPC_tccb:
      emit ("if(op_cc == 8 || COND(context,op_cc)) put_word_reg(context,reg_dst, 1);\n");
      break;
    case OPC_lda:
      emit ("tmp = oplval_src; \n");
      /*(((oplval_src) & 0xff0000) << 8) | (oplval_src & 0xffff); \n");*/
      break;
    case OPC_ldk:
    case OPC_ld:
 
    case OPC_ldb:
    case OPC_ldl:
      ld (p);
      break;
    case OPC_ldib:
      ldi (p, 8, 1);
      break;
    case OPC_ldi:
      ldi (p, 16, 1);
      break;
 
    case OPC_lddb:
      ldi (p, 8, -1);
      break;
    case OPC_ldd:
      ldi (p, 16, -1);
      break;
 
    case OPC_push:
    case OPC_pushl:
      push (p);
      break;
 
    case OPC_div:
    case OPC_divl:
      adiv (p);
      break;
    case OPC_mult:
    case OPC_multl:
      mult (p);
      break;
    case OPC_pop:
    case OPC_popl:
      pop (p);
      break;
    case OPC_set:
      doset (p,1);
      break;
    case OPC_res:
      doset (p,0);
      break;
    case OPC_bit:
      dobit(p);
      break;
    case OPC_resflg:
      doflag(0);
      break;
    case OPC_setflg:
      doflag(1);
      break;
    default:
 
      emit ("tmp = fail(context,%d);\n", p->opcode);
      break;
    }
}
 
/* emit code to store result in calculated lvalue */
 
void
info_store (p)
     opcode_entry_type *p;
{
  unsigned int *i = p->arg_info;
 
  while (*i)
    {
      current_name = reg_n (*i);
      current_size = size_name (p->type);
 
      if (IS_DST (*i))
        {
          switch (*i & CLASS_MASK)
            {
            case CLASS_PR:
              emit ("put_<ptr_mode>_reg(context,reg_<name>, tmp);\n");
              break;
            case CLASS_REG_LONG:
            case CLASS_REG_WORD:
            case CLASS_REG_BYTE:
 
              emit ("put_<size>_reg(context,reg_<name>,tmp);\n");
              break;
            case CLASS_X:
            case CLASS_IR:
            case CLASS_DA:
            case CLASS_BX:
            case CLASS_BA:
 
              emit ("put_<size>_<mem>_da(context,oplval_<name>, tmp);\n");
              break;
            case CLASS_IMM:
              break;
            default:
              emit ("abort(); ");
              break;
            }
 
        }
      i++;
    }
}
 
static
void
mangle (p, shortcut, value)
     opcode_entry_type *p;
     int shortcut;
     int value;
{
  int nostore = 0;
  int extra;
  int getdst = 1;
  int before = 0;
  int nosrc = 0;
 
  emit ("/\052 %s \052/\n", p->nicename);
  if (shortcut)
    {
      emit ("int <fop>_%04x(context,pc)\n", value);
    }
  else
    {
      emit ("int <fop>_%d(context,pc,iwords0)\n", p->idx);
      emit ("int iwords0;\n");
    }
  emit ("sim_state_type *context;\n");
  emit ("int pc;\n");
  emit ("{\n");
  emit ("register unsigned int tmp;\n");
  if (shortcut)
    {
      emit ("register unsigned int iwords0 = 0x%x;\n", value);
    }
 
  /* work out how much bigger this opcode could be because it's large
     model */
  if (BIG)
    {
      int i;
 
      extra = 0;
      for (i = 0; i < 4; i++)
        {
          if ((p->arg_info[i] & CLASS_MASK) == CLASS_DA
              || (p->arg_info[i] & CLASS_MASK) == CLASS_X)
            extra += 2;
        }
    }
  else
    {
      extra = 0;
    }
  printf ("                     /* Length %d */ \n", p->length + extra);
  switch (p->length + extra)
    {
    case 2:
      emit ("pc += 2\n;");
      break;
    case 4:
      emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
      emit ("pc += 4;\n");
      break;
    case 6:
 
      emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
      emit ("register unsigned int iwords2 = get_word_mem_da(context,pc+4);\n");
      emit ("pc += 6;\n");
      break;
    case 8:
      emit ("register unsigned int iwords1 = get_word_mem_da(context,pc+2);\n");
      emit ("register unsigned int iwords2 = get_word_mem_da(context,pc+4);\n");
      emit ("register unsigned int iwords3 = get_word_mem_da(context,pc+6);\n");
      emit ("pc += 8;\n");
      break;
    default:
      break;
 
    }
  emit ("context->cycles += %d;\n", p->cycles);
 
  emit ("{\n");
  info_args (p);
  info_special (p, &getdst, &nostore, &before, &nosrc);
 
  info_lvals (p);
  if (!nosrc)
    {
      info_fetch (p, getdst);
    }
 
  if (before)
    {
      info_docode (p);
    }
  else
    {
      info_docode (p);
    }
  if (!nostore)
    info_store (p);
  emit ("}\n");
  emit ("return pc;\n");
  emit ("}\n");
}
 
void
static
one_instruction (i)
     int i;
{
  /* find the table entry */
  opcode_entry_type *p = z8k_table + i;
 
  if (!p)
    return;
  mangle (p, 0, 0);
}
 
void
add_to_list (ptr, value)
     struct opcode_value **ptr;
     int value;
{
  struct opcode_value *prev;
 
  prev = *ptr;
  *ptr = (struct opcode_value *) malloc (sizeof (struct opcode_value));
 
  (*ptr)->n = value;
  (*ptr)->next = prev;
}
 
void
build_list (i)
     int i;
{
  opcode_entry_type *p = lookup_inst (i);
 
  if (!p)
    return;
  add_to_list (&list[p->idx], i);
}
 
int
main (ac, av)
     int ac;
     char **av;
{
  int i;
  int needcomma = 0;
 
  for (i = 1; i < ac; i++)
    {
      if (strcmp (av[i], "-1") == 0)
        file = 1;
      if (strcmp (av[i], "-2") == 0)
        file = 2;
      if (strcmp (av[i], "-3") == 0)
        file = 3;
      if (strcmp (av[i], "-b3") == 0)
        {
          file = 3;
          BIG = 1;
        }
 
    }
 
  /* First work out which opcodes use which bit patterns,
     build a list of all matching bit pattens */
  for (i = 0; i < 1 << 16; i++)
    {
      build_list (i);
    }
#if DUMP_LIST
  for (i = 0; i < NOPS; i++)
    {
      struct opcode_value *p;
 
      printf ("%d,", i);
      p = list[i];
      while (p)
        {
          printf (" %04x,", p->n);
          p = p->next;
        }
      printf ("-1\n");
    }
 
#endif
 
  if (file == 1)
    {
      extern int quick[];
 
      /* Do the shortcuts */
      printf ("                 /* SHORTCUTS */\n");
      for (i = 0; quick[i]; i++)
        {
          int t = quick[i];
 
          mangle (lookup_inst (t), 1, t);
        }
    }
  if (file == 3)
    {
      printf ("                 /* NOT -SHORTCUTS */\n");
      for (i = 0; i < NOPS; i++)
        {
          if (list[i])
            {
              one_instruction (i);
            }
          else
            {
              emit ("int <fop>_%d(context,pc)\n", i);
              printf ("sim_state_type *context;\n");
              printf ("int pc;\n");
              emit ("{ <fop>_bad1();return pc; }\n");
            }
        }
      emit ("int <fop>_bad() ;\n");
 
      /* Write the jump table */
      emit ("int (*(<fop>_table[]))() = {");
      needcomma = 0;
      for (i = 0; i < NOPS; i++)
        {
          if (needcomma)
            printf (",");
          emit ("<fop>_%d\n", i);
          needcomma = 1;
        }
      emit ("};\n");
    }
 
  if (file == 2)
    {
      extern int quick[];
      /* Static - since it's too be to be automatic on the apollo */
      static int big[64 * 1024];
 
      for (i = 0; i < 64 * 1024; i++)
        big[i] = 0;
 
      for (i = 0; quick[i]; i++)
        {
#if 0
 
          printf ("extern int <fop>_%04x();\n", quick[i]);
#endif
 
          big[quick[i]] = 1;
        }
 
      for (i = 0; i < NOPS; i++)
        {
#if 0
          printf ("extern int fop_%d();\n", i);
#endif
        }
#if 0
      printf ("extern int fop_bad();\n");
#endif
      printf ("struct op_info op_info_table[] = {\n");
      for (i = 0; i < 1 << 16; i++)
        {
          opcode_entry_type *p = lookup_inst (i);
 
          if (needcomma)
            printf (",");
#if 0
          if (big[i])
            {
              printf ("<fop>_%04x", i);
            }
          else
#endif
          if (p != NULL)
            {
              printf ("%d", p->idx);
            }
          else
            printf ("400");
          if (p != NULL)
            {
              printf ("         /* %04x %s */\n", i, p->nicename);
            }
          else
            {
              printf ("\n");
            }
          needcomma = 1;
        }
      printf ("};\n");
 
    }
  return 0;
}
 
char *
insn_ptr (n)
     int n;
{
  if (BIG)
    {
      abort ();
    }
 
  switch (n)
    {
    case 4:
      return "iwords_1";
    default:
      return "fail(context,123)";
    }
}
 
/* work out if the opcode only wants lvalues */
int
lvalue (p)
     opcode_entry_type *p;
{
  switch (p->opcode)
    {
    case OPC_lda:
      return 1;
    case OPC_call:
    case OPC_jp:
      return 1;
    default:
      return 0;
    }
}
 
int
info_len_in_words (o)
     opcode_entry_type *o;
{
  unsigned  int *p = o->byte_info;
  int nibs = 0;
 
  while (*p)
    {
      switch (*p & CLASS_MASK)
        {
        case CLASS_IGNORE:
        case CLASS_BIT:
        case CLASS_REGN0:
        case CLASS_REG:
        case CLASS_01II:
        case CLASS_00II:
          nibs++;
          break;
        case CLASS_ADDRESS:
          nibs += SIZE_ADDRESS;
          break;
        case CLASS_IMM:
          switch (*p & ~CLASS_MASK)
            {
            case ARG_IMM16:
              nibs += 4;
              break;
            case ARG_IMM32:
              nibs += 8;
              break;
            case ARG_IMM2:
            case ARG_IMM4:
            case ARG_NIM4:
            case ARG_IMM4M1:
            case ARG_IMM_1:
            case ARG_IMM_2:
            case ARG_IMMNMINUS1:
              nibs++;
              break;
            case ARG_NIM8:
 
            case ARG_IMM8:
              nibs += 2;
              break;
            default:
              abort ();
            }
          break;
        case CLASS_DISP:
          switch (*p & ~CLASS_MASK)
            {
            case ARG_DISP16:
              nibs += 4;
              break;
            case ARG_DISP12:
              nibs += 3;
              break;
            case ARG_DISP8:
              nibs += 2;
              break;
            default:
              abort ();
            }
          break;
        case CLASS_0DISP7:
        case CLASS_1DISP7:
        case CLASS_DISP8:
          nibs += 2;
          break;
        case CLASS_BIT_1OR2:
        case CLASS_0CCC:
        case CLASS_1CCC:
        case CLASS_CC:
          nibs++;
          break;
        default:
          emit ("don't know %x\n", *p);
        }
      p++;
    }
 
  return nibs / 4;              /* return umber of words */
}
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[/] [or1k/] [trunk/] [gdb-5.3/] [sim/] [z8k/] [writecode.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1181	sfurman	`/* generate instructions for Z8KSIM`
2
3			`Copyright 1992, 1993, 2002 Free Software Foundation, Inc.`
4
5			`This file is part of Z8KSIM`
6
7			`Z8KSIM is free software; you can redistribute it and/or modify`
8			`it under the terms of the GNU General Public License as published by`
9			`the Free Software Foundation; either version 2, or (at your option)`
10			`any later version.`
11
12			`Z8KSIM is distributed in the hope that it will be useful,`
13			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
14			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
15			`GNU General Public License for more details.`
16
17			`You should have received a copy of the GNU General Public License`
18			`along with Z8KZIM; if not, write to the Free Software`
19			`Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */`
20
21			`/* This program generates the code which emulates each of the z8k`
22			`instructions`
23
24			`code goes into three files, tc-gen1.h, tc-gen2.h and tc-gen3.h.`
25			`which file being made depends upon the options`
26
27			`-1 tc-gen1.h contains the fully expanded code for some selected`
28			`opcodes, (those in the quick.c list)`
29
30			`-2 tc-gen2.h contains a list of pointers to functions, one for each`
31			`opcode. It points to functions in tc-gen3.h and tc-gen1.h`
32			`depending upon quick.c`
33
34			`-3 tc-gen3.h contains all the opcodes in unexpanded form.`
35
36			`-b3 tc-genb3.h same as -3 but for long pointers`
37
38			`*/`
39
40			`/* steve chamberlain`