/* BFD library support routines for the i960 architecture.
   Copyright (C) 1990, 91, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
   Hacked by Steve Chamberlain of Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program 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 of the License, or
(at your option) any later version.

This program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */


#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"


/* This routine is provided a string, and tries to work out if it
   could possibly refer to the i960 machine pointed at in the
   info_struct pointer */

static boolean
scan_960_mach (ap, string)
     const bfd_arch_info_type *ap;
     const char *string;
{
  unsigned long machine;
  int i;
  int fail_because_not_80960 = false;
  
  for (i = 0; i < strlen (string); i ++)
    string[i] = tolower (string[i]);

  /* Look for the string i960 at the front of the string.  */
  if (strncmp ("i960", string, 4) == 0)
    {
      string += 4;

      /* i960 on it's own means core to us.  */
      if (* string == 0)
	return ap->mach == bfd_mach_i960_core;
      
      /* "i960:*" is valid, anything else is not.  */
      if (* string != ':')
	return false;

      string ++;
    }
  /* In some bfds the cpu-id is written as "80960KA", "80960KB",
     "80960CA" or "80960MC".  */
  else if (strncmp ("80960", string, 5) == 0)
    {
      string += 5;

      /* Sett his to true here.  If a correct matching postfix
	 is detected below it will be reset to false.  */
      fail_because_not_80960 = true;
    }
  /* No match, can't be us.  */
  else
    return false;
  
  if (* string == '\0')
    return false;
  
  if (string[0] == 'c' && string[1] == 'o' && string[2] == 'r' &&
      string[3] == 'e' && string[4] == '\0')
    machine = bfd_mach_i960_core;
  else if (strcmp (string, "ka_sa") == 0)
    machine = bfd_mach_i960_ka_sa;
  else if (strcmp (string, "kb_sb") == 0)
    machine = bfd_mach_i960_kb_sb;
  else if (string[1] == '\0' || string[2] != '\0') /* rest are 2-char.  */
    return false;
  else if (string[0] == 'k' && string[1] == 'b')
    { machine = bfd_mach_i960_kb_sb; fail_because_not_80960 = false; }
  else if (string[0] == 's' && string[1] == 'b')
    machine = bfd_mach_i960_kb_sb;
  else if (string[0] == 'm' && string[1] == 'c')
    { machine = bfd_mach_i960_mc; fail_because_not_80960 = false; }
  else if (string[0] == 'x' && string[1] == 'a')
    machine = bfd_mach_i960_xa;
  else if (string[0] == 'c' && string[1] == 'a')
    { machine = bfd_mach_i960_ca; fail_because_not_80960 = false; }
  else if (string[0] == 'k' && string[1] == 'a')
    { machine = bfd_mach_i960_ka_sa; fail_because_not_80960 = false; }
  else if (string[0] == 's' && string[1] == 'a')
    machine = bfd_mach_i960_ka_sa;
  else if (string[0] == 'j' && string[1] == 'x')
    machine = bfd_mach_i960_jx;
  else if (string[0] == 'h' && string[1] == 'x')
    machine = bfd_mach_i960_hx;
  else
    return false;

  if (fail_because_not_80960)
    return false;
  
  if (machine == ap->mach)
    return true;
  
  return false;
}


/* This routine is provided two arch_infos and works out the i960
   machine which would be compatible with both and returns a pointer
   to its info structure */

static const bfd_arch_info_type *
compatible (a,b)
     const bfd_arch_info_type *a;
     const bfd_arch_info_type *b;
{

  /* The i960 has distinct subspecies which may not interbreed:
	CORE CA          
	CORE KA KB MC XA
	CORE HX JX
     Any architecture on the same line is compatible, the one on
     the right is the least restrictive.  
     
     We represent this information in an array, each machine to a side */

#define ERROR	0
#define CORE	bfd_mach_i960_core  /*1*/  
#define KA 	bfd_mach_i960_ka_sa /*2*/ 
#define KB 	bfd_mach_i960_kb_sb /*3*/
#define MC 	bfd_mach_i960_mc    /*4*/
#define XA 	bfd_mach_i960_xa    /*5*/
#define CA 	bfd_mach_i960_ca    /*6*/
#define JX	bfd_mach_i960_jx    /*7*/
#define HX	bfd_mach_i960_hx    /*8*/
#define MAX_ARCH ((int)HX)

  static CONST unsigned long matrix[MAX_ARCH+1][MAX_ARCH+1] = 
    {
      { ERROR,	CORE,	KA,	KB,	MC,	XA,	CA,	JX,	HX },
      { CORE,	CORE,	KA,	KB,	MC,	XA,	CA,	JX,	HX },
      { KA,	KA,	KA,	KB,	MC,	XA,	ERROR,	ERROR,	ERROR},
      { KB,	KB,	KB,	KB,	MC,	XA,	ERROR, 	ERROR,	ERROR},
      { MC,	MC,	MC,	MC,	MC,	XA,	ERROR,	ERROR,	ERROR},
      { XA,	XA,	XA,	XA,	XA,	XA,	ERROR,	ERROR,	ERROR},
      { CA,	CA,	ERROR,	ERROR,	ERROR,	ERROR,	CA,	ERROR,	ERROR},
      { JX,	JX,	ERROR,	ERROR,	ERROR,	ERROR,	ERROR,  JX,	HX },
      { HX,	HX,	ERROR,	ERROR,	ERROR,	ERROR,	ERROR,	HX,	HX },
    };


  if (a->arch != b->arch || matrix[a->mach][b->mach] == ERROR) 
    {
    return NULL;
    }
  else 
    {
    return (a->mach  ==  matrix[a->mach][b->mach]) ?  a : b;
    }
}


int bfd_default_scan_num_mach();
#define N(a,b,d,n) \
{ 32, 32, 8,bfd_arch_i960,a,"i960",b,3,d,compatible,scan_960_mach,n,}

static const bfd_arch_info_type arch_info_struct[] = 
{ 
  N(bfd_mach_i960_ka_sa,"i960:ka_sa",false, &arch_info_struct[1]),
  N(bfd_mach_i960_kb_sb,"i960:kb_sb",false, &arch_info_struct[2]),
  N(bfd_mach_i960_mc,   "i960:mc",   false, &arch_info_struct[3]),
  N(bfd_mach_i960_xa,   "i960:xa",   false, &arch_info_struct[4]),
  N(bfd_mach_i960_ca,   "i960:ca",   false, &arch_info_struct[5]),
  N(bfd_mach_i960_jx,   "i960:jx",   false, &arch_info_struct[6]),
  N(bfd_mach_i960_hx,	"i960:hx",   false, 0),
};

const bfd_arch_info_type bfd_i960_arch =
  N(bfd_mach_i960_core, "i960:core", true, &arch_info_struct[0]);