6066 dis: support for System/370, System/390, and z/Architecture ELF bins

*** 23,32 ****
--- 23,33 ----
   * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
   * Use is subject to license terms.
   *
   * Copyright 2011 Jason King.  All rights reserved.
   * Copyright 2012 Joshua M. Clulow <josh@sysmgr.org>
+  * Copyright 2015 Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   */
  
  #include <ctype.h>
  #include <getopt.h>
  #include <stdio.h>
*** 544,553 ****
--- 545,580 ----
  
                  case EM_AMD64:
                          g_flags |= DIS_X86_SIZE64;
                          break;
  
+                 case EM_S370:
+                         g_flags |= DIS_S370;
+ 
+                         if (ehdr.e_ident[EI_CLASS] != ELFCLASS32 ||
+                             ehdr.e_ident[EI_DATA] != ELFDATA2MSB) {
+                                 warn("invalid E_IDENT field for S370 object");
+                                 return;
+                         }
+                         break;
+ 
+                 case EM_S390:
+                         if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) {
+                                 g_flags |= DIS_S390_31;
+                         } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) {
+                                 g_flags |= DIS_S390_64;
+                         } else {
+                                 warn("invalid E_IDENT field for S390 object");
+                                 return;
+                         }
+ 
+                         if (ehdr.e_ident[EI_DATA] != ELFDATA2MSB) {
+                                 warn("invalid E_IDENT field for S390 object");
+                                 return;
+                         }
+                         break;
+ 
                  default:
                          die("%s: unsupported ELF machine 0x%x", filename,
                              ehdr.e_machine);
                  }