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/* s390-mkopc.c -- Generates opcode table out of s390-opc.txt

   Copyright 2000, 2001, 2003, 2007 Free Software Foundation, Inc.

   Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).

   This file is part of the GNU opcodes library.

   This library 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 3, or (at your option)

   any later version.

   It 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 this file; see the file COPYING.  If not, write to the

   Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

/* Taken from opcodes/s390.h */

enum s390_opcode_mode_val

  {

    S390_OPCODE_ESA = 0,

    S390_OPCODE_ZARCH

  };

enum s390_opcode_cpu_val

  {

    S390_OPCODE_G5 = 0,

    S390_OPCODE_G6,

    S390_OPCODE_Z900,

    S390_OPCODE_Z990,

    S390_OPCODE_Z9_109,

    S390_OPCODE_Z9_EC

  };

struct op_struct

  {

    char  opcode[16];

    char  mnemonic[16];

    char  format[16];

    int   mode_bits;

    int   min_cpu;

    unsigned long long sort_value;

    int   no_nibbles;

  };

struct op_struct *op_array;

int max_ops;

int no_ops;

static void

createTable (void)

{

  max_ops = 256;

  op_array = malloc (max_ops * sizeof (struct op_struct));

  no_ops = 0;

}

/* `insertOpcode': insert an op_struct into sorted opcode array.  */

static void

insertOpcode (char *opcode, char *mnemonic, char *format,

              int min_cpu, int mode_bits)

{

  char *str;

  unsigned long long sort_value;

  int no_nibbles;

  int ix, k;

  while (no_ops >= max_ops)

    {

      max_ops = max_ops * 2;

      op_array = realloc (op_array, max_ops * sizeof (struct op_struct));

    }

  sort_value = 0;

  str = opcode;

  for (ix = 0; ix < 16; ix++)

    {

      if (*str >= '0' && *str <= '9')

        sort_value = (sort_value << 4) + (*str - '0');

      else if (*str >= 'a' && *str <= 'f')

        sort_value = (sort_value << 4) + (*str - 'a' + 10);

      else if (*str >= 'A' && *str <= 'F')

        sort_value = (sort_value << 4) + (*str - 'A' + 10);

      else if (*str == '?')

        sort_value <<= 4;

      else

        break;

      str ++;

    }

  sort_value <<= 4*(16 - ix);

  sort_value += (min_cpu << 8) + mode_bits;

  no_nibbles = ix;

  for (ix = 0; ix < no_ops; ix++)

    if (sort_value > op_array[ix].sort_value)

      break;

  for (k = no_ops; k > ix; k--)

    op_array[k] = op_array[k-1];

  strcpy(op_array[ix].opcode, opcode);

  strcpy(op_array[ix].mnemonic, mnemonic);

  strcpy(op_array[ix].format, format);

  op_array[ix].sort_value = sort_value;

  op_array[ix].no_nibbles = no_nibbles;

  op_array[ix].min_cpu = min_cpu;

  op_array[ix].mode_bits = mode_bits;

  no_ops++;

}

struct s390_cond_ext_format

{

  char nibble;

  char extension[4];

};

#define NUM_COND_EXTENSIONS 20

const struct s390_cond_ext_format s390_cond_extensions[NUM_COND_EXTENSIONS] =

  {

    { '1', "o" },    /* jump on overflow / if ones */

    { '2', "h" },    /* jump on A high */

    { '2', "p" },    /* jump on plus */

    { '3', "nle" },  /* jump on not low or equal */

    { '4', "l" },    /* jump on A low */

    { '4', "m" },    /* jump on minus / if mixed */

    { '5', "nhe" },  /* jump on not high or equal */

    { '6', "lh" },   /* jump on low or high */

    { '7', "ne" },   /* jump on A not equal B */

    { '7', "nz" },   /* jump on not zero / if not zeros */

    { '8', "e" },    /* jump on A equal B */

    { '8', "z" },    /* jump on zero / if zeros */

    { '9', "nlh" },  /* jump on not low or high */

    { 'a', "he" },   /* jump on high or equal */

    { 'b', "nl" },   /* jump on A not low */

    { 'b', "nm" },   /* jump on not minus / if not mixed */

    { 'c', "le" },   /* jump on low or equal */

    { 'd', "nh" },   /* jump on A not high */

    { 'd', "np" },   /* jump on not plus */

    { 'e', "no" },   /* jump on not overflow / if not ones */

  };

/* As with insertOpcode instructions are added to the sorted opcode

   array.  Additionally mnemonics containing the '*<number>' tag are

   expanded to the set of conditional instructions described by

   s390_cond_extensions with the '*<number>' tag replaced by the

   respective mnemonic extensions.  */

static void

expandConditionalJump (char *opcode, char *mnemonic, char *format,

                       int min_cpu, int mode_bits)

{

  char prefix[5];

  char suffix[5];

  char number[5];

  int mask_start, i = 0, star_found = 0, reading_number = 0;

  int number_p = 0, suffix_p = 0, prefix_p = 0;

  while (mnemonic[i] != '\0')

    {

      switch (mnemonic[i])

        {

        case '*':

          if (star_found)

            goto malformed_mnemonic;

          star_found = 1;

          reading_number = 1;

          break;

        case '0': case '1': case '2': case '3': case '4':

        case '5': case '6': case '7': case '8': case '9':

          if (!star_found || !reading_number)

            goto malformed_mnemonic;

          number[number_p++] = mnemonic[i];

          break;

        default:

          if (reading_number)

            {

              if (!number_p)

                goto malformed_mnemonic;

              else

                reading_number = 0;

            }

          if (star_found)

            suffix[suffix_p++] = mnemonic[i];

          else

            prefix[prefix_p++] = mnemonic[i];

        }

      i++;

    }

  prefix[prefix_p] = '\0';

  suffix[suffix_p] = '\0';

  number[number_p] = '\0';

  if (sscanf (number, "%d", &mask_start) != 1)

    goto malformed_mnemonic;

  if (mask_start & 3)

    {

      fprintf (stderr, "Conditional mask not at nibble boundary in: %s\n",

               mnemonic);

      return;

    }

  mask_start >>= 2;

  for (i = 0; i < NUM_COND_EXTENSIONS; i++)

    {

      char new_mnemonic[15];

      strcpy (new_mnemonic, prefix);

      strcat (new_mnemonic, s390_cond_extensions[i].extension);

      strcat (new_mnemonic, suffix);

      opcode[mask_start] = s390_cond_extensions[i].nibble;

      insertOpcode (opcode, new_mnemonic, format, min_cpu, mode_bits);

    }

  return;

 malformed_mnemonic:

  fprintf (stderr, "Malformed mnemonic: %s\n", mnemonic);

}

static char file_header[] =

  "/* The opcode table. This file was generated by s390-mkopc.\n\n"

  "   The format of the opcode table is:\n\n"

  "   NAME           OPCODE     MASK    OPERANDS\n\n"

  "   Name is the name of the instruction.\n"

  "   OPCODE is the instruction opcode.\n"

  "   MASK is the opcode mask; this is used to tell the disassembler\n"

  "     which bits in the actual opcode must match OPCODE.\n"

  "   OPERANDS is the list of operands.\n\n"

  "   The disassembler reads the table in order and prints the first\n"

  "   instruction which matches.  */\n\n"

  "const struct s390_opcode s390_opcodes[] =\n  {\n";

/* `dumpTable': write opcode table.  */

static void

dumpTable (void)

{

  char *str;

  int  ix;

  /*  Write hash table entries (slots).  */

  printf (file_header);

  for (ix = 0; ix < no_ops; ix++)

    {

      printf ("  { \"%s\", ", op_array[ix].mnemonic);

      for (str = op_array[ix].opcode; *str != 0; str++)

        if (*str == '?')

          *str = '0';

      printf ("OP%i(0x%sLL), ",

              op_array[ix].no_nibbles*4, op_array[ix].opcode);

      printf ("MASK_%s, INSTR_%s, ",

              op_array[ix].format, op_array[ix].format);

      printf ("%i, ", op_array[ix].mode_bits);

      printf ("%i}", op_array[ix].min_cpu);

      if (ix < no_ops-1)

        printf (",\n");

      else

        printf ("\n");

    }

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

  printf ("const int s390_num_opcodes =\n");

  printf ("  sizeof (s390_opcodes) / sizeof (s390_opcodes[0]);\n\n");

}

int

main (void)

{

  char currentLine[256];

  createTable ();

  /*  Read opcode descriptions from `stdin'.  For each mnemonic,

      make an entry into the opcode table.  */

  while (fgets (currentLine, sizeof (currentLine), stdin) != NULL)

    {

      char  opcode[16];

      char  mnemonic[16];

      char  format[16];

      char  description[64];

      char  cpu_string[16];

      char  modes_string[16];

      int   min_cpu;

      int   mode_bits;

      char  *str;

      if (currentLine[0] == '#')

        continue;

      memset (opcode, 0, 8);

      if (sscanf (currentLine, "%15s %15s %15s \"%[^\"]\" %15s %15s",

                  opcode, mnemonic, format, description,

                  cpu_string, modes_string) == 6)

        {

          if (strcmp (cpu_string, "g5") == 0)

            min_cpu = S390_OPCODE_G5;

          else if (strcmp (cpu_string, "g6") == 0)

            min_cpu = S390_OPCODE_G6;

          else if (strcmp (cpu_string, "z900") == 0)

            min_cpu = S390_OPCODE_Z900;

          else if (strcmp (cpu_string, "z990") == 0)

            min_cpu = S390_OPCODE_Z990;

          else if (strcmp (cpu_string, "z9-109") == 0)

            min_cpu = S390_OPCODE_Z9_109;

          else if (strcmp (cpu_string, "z9-ec") == 0)

            min_cpu = S390_OPCODE_Z9_EC;

          else {

            fprintf (stderr, "Couldn't parse cpu string %s\n", cpu_string);

            exit (1);

          }

          str = modes_string;

          mode_bits = 0;

          do {

            if (strncmp (str, "esa", 3) == 0

                && (str[3] == 0 || str[3] == ',')) {

              mode_bits |= 1 << S390_OPCODE_ESA;

              str += 3;

            } else if (strncmp (str, "zarch", 5) == 0

                       && (str[5] == 0 || str[5] == ',')) {

              mode_bits |= 1 << S390_OPCODE_ZARCH;

              str += 5;

            } else {

              fprintf (stderr, "Couldn't parse modes string %s\n",

                       modes_string);

              exit (1);

            }

            if (*str == ',')

              str++;

          } while (*str != 0);

          if (!strchr (mnemonic, '*'))

            insertOpcode (opcode, mnemonic, format, min_cpu, mode_bits);

          else

            expandConditionalJump (opcode, mnemonic, format,

                                   min_cpu, mode_bits);

        }

      else

        fprintf (stderr, "Couldn't scan line %s\n", currentLine);

    }

  dumpTable ();

  return 0;

}