ld/emultempl/aix.em

   1 # This shell script emits a C file. -*- C -*-
   2 # It does some substitutions.
   3 cat >e${EMULATION_NAME}.c <<EOF
   4 /* This file is is generated by a shell script.  DO NOT EDIT! */
   5
   6 /* AIX emulation code for ${EMULATION_NAME}
   7    Copyright (C) 1991, 1993, 1995 Free Software Foundation, Inc.
   8    Written by Steve Chamberlain <sac@cygnus.com>
   9    AIX support by Ian Lance Taylor <ian@cygnus.com>
  10
  11 This file is part of GLD, the Gnu Linker.
  12
  13 This program is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 2 of the License, or
  16 (at your option) any later version.
  17
  18 This program is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with this program; if not, write to the Free Software
  25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  26
  27 #define TARGET_IS_${EMULATION_NAME}
  28
  29 #include "bfd.h"
  30 #include "sysdep.h"
  31 #include "libiberty.h"
  32 #include "getopt.h"
  33 #include "bfdlink.h"
  34
  35 #include <ctype.h>
  36
  37 #include "ld.h"
  38 #include "ldmain.h"
  39 #include "ldemul.h"
  40 #include "ldfile.h"
  41 #include "ldmisc.h"
  42 #include "ldexp.h"
  43 #include "ldlang.h"
  44 #include "ldctor.h"
  45 #include "ldgram.h"
  46
  47 static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
  48 static int gld${EMULATION_NAME}_parse_args PARAMS ((int, char **));
  49 static void gld${EMULATION_NAME}_after_open PARAMS ((void));
  50 static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
  51 static void gld${EMULATION_NAME}_read_file PARAMS ((const char *, boolean));
  52 static void gld${EMULATION_NAME}_free PARAMS ((PTR));
  53 static void gld${EMULATION_NAME}_find_relocs
  54   PARAMS ((lang_statement_union_type *));
  55 static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
  56 static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
  57
  58 /* The file alignment required for each section.  */
  59 static unsigned long file_align;
  60
  61 /* The maximum size the stack is permitted to grow.  This is stored in
  62    the a.out header.  */
  63 static unsigned long maxstack;
  64
  65 /* The maximum data size.  This is stored in the a.out header.  */
  66 static unsigned long maxdata;
  67
  68 /* Whether to perform garbage collection.  */
  69 static int gc = 1;
  70
  71 /* The module type to use.  */
  72 static unsigned short modtype = ('1' << 8) | 'L';
  73
  74 /* Whether the .text section must be read-only (i.e., no relocs
  75    permitted).  */
  76 static int textro;
  77
  78 /* Whether to implement Unix like linker semantics.  */
  79 static int unix_ld;
  80
  81 /* Structure used to hold import file list.  */
  82
  83 struct filelist
  84 {
  85   struct filelist *next;
  86   const char *name;
  87 };
  88
  89 /* List of import files.  */
  90 static struct filelist *import_files;
  91
  92 /* List of export symbols read from the export files.  */
  93
  94 struct export_symbol_list
  95 {
  96   struct export_symbol_list *next;
  97   const char *name;
  98   boolean syscall;
  99 };
 100
 101 static struct export_symbol_list *export_symbols;
 102
 103 /* This routine is called before anything else is done.  */
 104
 105 static void
 106 gld${EMULATION_NAME}_before_parse()
 107 {
 108 #ifndef TARGET_                 /* I.e., if not generic.  */
 109   ldfile_output_architecture = bfd_arch_${ARCH};
 110 #endif /* not TARGET_ */
 111 }
 112
 113 /* Handle AIX specific options.  */
 114
 115 static int
 116 gld${EMULATION_NAME}_parse_args (argc, argv)
 117      int argc;
 118      char **argv;
 119 {
 120   int prevoptind = optind;
 121   int prevopterr = opterr;
 122   int indx;
 123   int longind;
 124   int optc;
 125   long val;
 126   char *end;
 127
 128 #define OPTION_IGNORE (300)
 129 #define OPTION_AUTOIMP (OPTION_IGNORE + 1)
 130 #define OPTION_ERNOTOK (OPTION_AUTOIMP + 1)
 131 #define OPTION_EROK (OPTION_ERNOTOK + 1)
 132 #define OPTION_EXPORT (OPTION_EROK + 1)
 133 #define OPTION_IMPORT (OPTION_EXPORT + 1)
 134 #define OPTION_LOADMAP (OPTION_IMPORT + 1)
 135 #define OPTION_MAXDATA (OPTION_LOADMAP + 1)
 136 #define OPTION_MAXSTACK (OPTION_MAXDATA + 1)
 137 #define OPTION_MODTYPE (OPTION_MAXSTACK + 1)
 138 #define OPTION_NOAUTOIMP (OPTION_MODTYPE + 1)
 139 #define OPTION_NOSTRCMPCT (OPTION_NOAUTOIMP + 1)
 140 #define OPTION_PD (OPTION_NOSTRCMPCT + 1)
 141 #define OPTION_PT (OPTION_PD + 1)
 142 #define OPTION_STRCMPCT (OPTION_PT + 1)
 143 #define OPTION_UNIX (OPTION_STRCMPCT + 1)
 144
 145   static struct option longopts[] = {
 146     {"basis", no_argument, NULL, OPTION_IGNORE},
 147     {"bautoimp", no_argument, NULL, OPTION_AUTOIMP},
 148     {"bcomprld", no_argument, NULL, OPTION_IGNORE},
 149     {"bcrld", no_argument, NULL, OPTION_IGNORE},
 150     {"bcror31", no_argument, NULL, OPTION_IGNORE},
 151     {"bD", required_argument, NULL, OPTION_MAXDATA},
 152     {"bE", required_argument, NULL, OPTION_EXPORT},
 153     {"bernotok", no_argument, NULL, OPTION_ERNOTOK},
 154     {"berok", no_argument, NULL, OPTION_EROK},
 155     {"berrmsg", no_argument, NULL, OPTION_IGNORE},
 156     {"bexport", required_argument, NULL, OPTION_EXPORT},
 157     {"bf", no_argument, NULL, OPTION_ERNOTOK},
 158     {"bgc", no_argument, &gc, 1},
 159     {"bh", required_argument, NULL, OPTION_IGNORE},
 160     {"bhalt", required_argument, NULL, OPTION_IGNORE},
 161     {"bI", required_argument, NULL, OPTION_IMPORT},
 162     {"bimport", required_argument, NULL, OPTION_IMPORT},
 163     {"bl", required_argument, NULL, OPTION_LOADMAP},
 164     {"bloadmap", required_argument, NULL, OPTION_LOADMAP},
 165     {"bmaxdata", required_argument, NULL, OPTION_MAXDATA},
 166     {"bmaxstack", required_argument, NULL, OPTION_MAXSTACK},
 167     {"bM", required_argument, NULL, OPTION_MODTYPE},
 168     {"bmodtype", required_argument, NULL, OPTION_MODTYPE},
 169     {"bnoautoimp", no_argument, NULL, OPTION_NOAUTOIMP},
 170     {"bnodelcsect", no_argument, NULL, OPTION_IGNORE},
 171     {"bnogc", no_argument, &gc, 0},
 172     {"bnso", no_argument, NULL, OPTION_NOAUTOIMP},
 173     {"bnostrcmpct", no_argument, NULL, OPTION_NOSTRCMPCT},
 174     {"bnotextro", no_argument, &textro, 0},
 175     {"bnro", no_argument, &textro, 0},
 176     {"bpD", required_argument, NULL, OPTION_PD},
 177     {"bpT", required_argument, NULL, OPTION_PT},
 178     {"bro", no_argument, &textro, 1},
 179     {"bS", required_argument, NULL, OPTION_MAXSTACK},
 180     {"bso", no_argument, NULL, OPTION_AUTOIMP},
 181     {"bstrcmpct", no_argument, NULL, OPTION_STRCMPCT},
 182     {"btextro", no_argument, &textro, 1},
 183     {"static", no_argument, NULL, OPTION_NOAUTOIMP},
 184     {"unix", no_argument, NULL, OPTION_UNIX},
 185     {NULL, no_argument, NULL, 0}
 186   };
 187
 188   /* Options supported by the AIX linker which we do not support: -f,
 189      -S, -v, -Z, -bbindcmds, -bbinder, -bbindopts, -bcalls, -bcaps,
 190      -bcror15, -bdebugopt, -bdbg, -bdelcsect, -bex?, -bfilelist, -bfl,
 191      -bgcbypass, -bglink, -binsert, -bi, -bloadmap, -bl, -bmap, -bnl,
 192      -bnobind, -bnocomprld, -bnocrld, -bnoerrmsg, -bnoglink,
 193      -bnoloadmap, -bnl, -bnoobjreorder, -bnoquiet, -bnoreorder,
 194      -bnotypchk, -bnox, -bquiet, -bR, -brename, -breorder, -btypchk,
 195      -bx, -bX, -bxref.  */
 196
 197   /* If the current option starts with -b, change the first : to an =.
 198      The AIX linker uses : to separate the option from the argument;
 199      changing it to = lets us treat it as a getopt option.  */
 200   indx = optind;
 201   if (indx == 0)
 202     indx = 1;
 203   if (indx < argc && strncmp (argv[indx], "-b", 2) == 0)
 204     {
 205       char *s;
 206
 207       for (s = argv[indx]; *s != '\0'; s++)
 208         {
 209           if (*s == ':')
 210             {
 211               *s = '=';
 212               break;
 213             }
 214         }
 215     }
 216
 217   opterr = 0;
 218   optc = getopt_long_only (argc, argv, "-D:H:KT:z", longopts, &longind);
 219   opterr = prevopterr;
 220
 221   switch (optc)
 222     {
 223     default:
 224       optind = prevoptind;
 225       return 0;
 226
 227     case 0:
 228       /* Long option which just sets a flag.  */
 229       break;
 230
 231     case 'D':
 232       val = strtol (optarg, &end, 0);
 233       if (*end != '\0')
 234         einfo ("%P: warning: ignoring invalid -D number %s\n", optarg);
 235       else if (val != -1)
 236         lang_section_start (".data", exp_intop (val));
 237       break;
 238
 239     case 'H':
 240       val = strtoul (optarg, &end, 0);
 241       if (*end != '\0'
 242           || (val & (val - 1)) != 0)
 243         einfo ("%P: warning: ignoring invalid -H number %s\n", optarg);
 244       else
 245         file_align = val;
 246       break;
 247
 248     case 'K':
 249     case 'z':
 250       /* FIXME: This should use the page size for the target system.  */
 251       file_align = 4096;
 252       break;
 253
 254     case 'T':
 255       /* On AIX this is the same as GNU ld -Ttext.  When we see -T
 256          number, we assume the AIX option is intended.  Otherwise, we
 257          assume the usual GNU ld -T option is intended.  We can't just
 258          ignore the AIX option, because gcc passes it to the linker.  */
 259       val = strtoul (optarg, &end, 0);
 260       if (*end != '\0')
 261         {
 262           optind = prevoptind;
 263           return 0;
 264         }
 265       lang_section_start (".text", exp_intop (val));
 266       break;
 267
 268     case OPTION_IGNORE:
 269       break;
 270
 271     case OPTION_AUTOIMP:
 272       link_info.static_link = false;
 273       break;
 274
 275     case OPTION_ERNOTOK:
 276       force_make_executable = false;
 277       break;
 278
 279     case OPTION_EROK:
 280       force_make_executable = true;
 281       break;
 282
 283     case OPTION_EXPORT:
 284       gld${EMULATION_NAME}_read_file (optarg, false);
 285       break;
 286
 287     case OPTION_IMPORT:
 288       {
 289         struct filelist *n;
 290         struct filelist **flpp;
 291
 292         n = (struct filelist *) xmalloc (sizeof (struct filelist));
 293         n->next = NULL;
 294         n->name = optarg;
 295         flpp = &import_files;
 296         while (*flpp != NULL)
 297           flpp = &(*flpp)->next;
 298         *flpp = n;
 299       }
 300       break;
 301
 302     case OPTION_LOADMAP:
 303       config.map_filename = optarg;
 304       break;
 305
 306     case OPTION_MAXDATA:
 307       val = strtoul (optarg, &end, 0);
 308       if (*end != '\0')
 309         einfo ("%P: warning: ignoring invalid -bmaxdata number %s\n",
 310                optarg);
 311       else
 312         maxdata = val;
 313       break;
 314
 315     case OPTION_MAXSTACK:
 316       val = strtoul (optarg, &end, 0);
 317       if (*end != '\0')
 318         einfo ("%P: warning: ignoring invalid -bmaxstack number %s\n",
 319                optarg);
 320       else
 321         maxstack = val;
 322       break;
 323
 324     case OPTION_MODTYPE:
 325       if (*optarg == 'S')
 326         {
 327           link_info.shared = true;
 328           ++optarg;
 329         }
 330       if (*optarg == '\0' || optarg[1] == '\0')
 331         einfo ("%P: warning: ignoring invalid module type %s\n", optarg);
 332       else
 333         modtype = (*optarg << 8) | optarg[1];
 334       break;
 335
 336     case OPTION_NOAUTOIMP:
 337       link_info.static_link = true;
 338       break;
 339
 340     case OPTION_NOSTRCMPCT:
 341       config.traditional_format = true;
 342       break;
 343
 344     case OPTION_PD:
 345       /* This sets the page that the .data section is supposed to
 346          start on.  The offset within the page should still be the
 347          offset within the file, so we need to build an appropriate
 348          expression.  */
 349       val = strtoul (optarg, &end, 0);
 350       if (*end != '\0')
 351         einfo ("%P: warning: ignoring invalid -pD number %s\n", optarg);
 352       else
 353         {
 354           etree_type *t;
 355
 356           t = exp_binop ('+',
 357                          exp_intop (val),
 358                          exp_binop ('&',
 359                                     exp_nameop (NAME, "."),
 360                                     exp_intop (0xfff)));
 361           t = exp_binop ('&',
 362                          exp_binop ('+', t, exp_intop (7)),
 363                          exp_intop (~ (bfd_vma) 7));
 364           lang_section_start (".data", t);
 365         }
 366       break;
 367
 368     case OPTION_PT:
 369       /* This set the page that the .text section is supposed to start
 370          on.  The offset within the page should still be the offset
 371          within the file.  */
 372       val = strtoul (optarg, &end, 0);
 373       if (*end != '\0')
 374         einfo ("%P: warning: ignoring invalid -pT number %s\n", optarg);
 375       else
 376         {
 377           etree_type *t;
 378
 379           t = exp_binop ('+',
 380                          exp_intop (val),
 381                          exp_nameop (SIZEOF_HEADERS, NULL));
 382           t = exp_binop ('&',
 383                          exp_binop ('+', t, exp_intop (7)),
 384                          exp_intop (~ (bfd_vma) 7));
 385           lang_section_start (".text", t);
 386         }
 387       break;
 388
 389     case OPTION_STRCMPCT:
 390       config.traditional_format = false;
 391       break;
 392
 393     case OPTION_UNIX:
 394       unix_ld = true;
 395       break;
 396     }
 397
 398   return 1;
 399 }
 400
 401 /* This is called after the input files have been opened.  */
 402
 403 static void
 404 gld${EMULATION_NAME}_after_open ()
 405 {
 406   boolean r;
 407   struct set_info *p;
 408
 409   /* Call ldctor_build_sets, after pretending that this is a
 410      relocateable link.  We do this because AIX requires relocation
 411      entries for all references to symbols, even in a final
 412      executable.  Of course, we only want to do this if we are
 413      producing an XCOFF output file.  */
 414   r = link_info.relocateable;
 415   if (strstr (bfd_get_target (output_bfd), "xcoff") != NULL)
 416     link_info.relocateable = true;
 417   ldctor_build_sets ();
 418   link_info.relocateable = r;
 419
 420   /* For each set, record the size, so that the XCOFF backend can
 421      output the correct csect length.  */
 422   for (p = sets; p != (struct set_info *) NULL; p = p->next)
 423     {
 424       bfd_size_type size;
 425
 426       /* If the symbol is defined, we may have been invoked from
 427          collect, and the sets may already have been built, so we do
 428          not do anything.  */
 429       if (p->h->type == bfd_link_hash_defined
 430           || p->h->type == bfd_link_hash_defweak)
 431         continue;
 432
 433       if (p->reloc != BFD_RELOC_CTOR)
 434         {
 435           /* Handle this if we need to.  */
 436           abort ();
 437         }
 438
 439       size = (p->count + 2) * 4;
 440       if (! bfd_xcoff_link_record_set (output_bfd, &link_info, p->h, size))
 441         einfo ("%F%P: bfd_xcoff_link_record_set failed: %E\n");
 442     }
 443 }
 444
 445 /* This is called after the sections have been attached to output
 446    sections, but before any sizes or addresses have been set.  */
 447
 448 static void
 449 gld${EMULATION_NAME}_before_allocation ()
 450 {
 451   struct filelist *fl;
 452   struct export_symbol_list *el;
 453   char *libpath;
 454   boolean export_defineds;
 455   asection *special_sections[6];
 456   int i;
 457
 458   /* Handle the import and export files, if any.  */
 459   for (fl = import_files; fl != NULL; fl = fl->next)
 460     gld${EMULATION_NAME}_read_file (fl->name, true);
 461   for (el = export_symbols; el != NULL; el = el->next)
 462     {
 463       struct bfd_link_hash_entry *h;
 464
 465       h = bfd_link_hash_lookup (link_info.hash, el->name, false, false, false);
 466       if (h == NULL)
 467         einfo ("%P%F: bfd_link_hash_lookup of export symbol failed: %E\n");
 468       if (! bfd_xcoff_export_symbol (output_bfd, &link_info, h, el->syscall))
 469         einfo ("%P%F: bfd_xcoff_export_symbol failed: %E\n");
 470     }
 471
 472   /* Track down all relocations called for by the linker script (these
 473      are typically constructor/destructor entries created by
 474      CONSTRUCTORS) and let the backend know it will need to create
 475      .loader relocs for them.  */
 476   lang_for_each_statement (gld${EMULATION_NAME}_find_relocs);
 477
 478   /* We need to build LIBPATH from the -L arguments.  If any -rpath
 479      arguments were used, though, we use -rpath instead, as a GNU
 480      extension.  */
 481   if (command_line.rpath != NULL)
 482     libpath = command_line.rpath;
 483   else if (search_head == NULL)
 484     libpath = (char *) "";
 485   else
 486     {
 487       size_t len;
 488       search_dirs_type *search;
 489
 490       len = strlen (search_head->name);
 491       libpath = xmalloc (len + 1);
 492       strcpy (libpath, search_head->name);
 493       for (search = search_head->next; search != NULL; search = search->next)
 494         {
 495           size_t nlen;
 496
 497           nlen = strlen (search->name);
 498           libpath = xrealloc (libpath, len + nlen + 2);
 499           libpath[len] = ':';
 500           strcpy (libpath + len + 1, search->name);
 501           len += nlen + 1;
 502         }
 503     }
 504
 505   /* If we are emulating the Unix linker, we want to export all
 506      defined symbols, unless an explicit -bE option was used.  */
 507   export_defineds = false;
 508   if (unix_ld && export_symbols == NULL)
 509     export_defineds = true;
 510
 511   /* Let the XCOFF backend set up the .loader section.  */
 512   if (! bfd_xcoff_size_dynamic_sections (output_bfd, &link_info, libpath,
 513                                          entry_symbol, file_align,
 514                                          maxstack, maxdata,
 515                                          gc && ! unix_ld ? true : false,
 516                                          modtype,
 517                                          textro ? true : false,
 518                                          export_defineds,
 519                                          special_sections))
 520     einfo ("%P%F: failed to set dynamic section sizes: %E\n");
 521
 522   /* Look through the special sections, and put them in the right
 523      place in the link ordering.  This is especially magic.  */
 524   for (i = 0; i < 6; i++)
 525     {
 526       asection *sec;
 527       lang_output_section_statement_type *os;
 528       lang_statement_union_type **pls;
 529       lang_input_section_type *is;
 530       const char *oname;
 531       boolean start;
 532
 533       sec = special_sections[i];
 534       if (sec == NULL)
 535         continue;
 536
 537       /* Remove this section from the list of the output section.
 538          This assumes we know what the script looks like.  */
 539       is = NULL;
 540       os = lang_output_section_find (sec->output_section->name);
 541       if (os == NULL)
 542         einfo ("%P%F: can't find output section %s\n",
 543                sec->output_section->name);
 544       for (pls = &os->children.head; *pls != NULL; pls = &(*pls)->next)
 545         {
 546           if ((*pls)->header.type == lang_input_section_enum
 547               && (*pls)->input_section.section == sec)
 548             {
 549               is = (lang_input_section_type *) *pls;
 550               *pls = (*pls)->next;
 551               break;
 552             }
 553           if ((*pls)->header.type == lang_wild_statement_enum)
 554             {
 555               lang_statement_union_type **pwls;
 556
 557               for (pwls = &(*pls)->wild_statement.children.head;
 558                    *pwls != NULL;
 559                    pwls = &(*pwls)->next)
 560                 {
 561                   if ((*pwls)->header.type == lang_input_section_enum
 562                       && (*pwls)->input_section.section == sec)
 563                     {
 564                       is = (lang_input_section_type *) *pwls;
 565                       *pwls = (*pwls)->next;
 566                       break;
 567                     }
 568                 }
 569               if (is != NULL)
 570                 break;
 571             }
 572         }
 573
 574       if (is == NULL)
 575         einfo ("%P%F: can't find %s in output section\n",
 576                bfd_get_section_name (sec->owner, sec));
 577
 578       /* Now figure out where the section should go.  */
 579       switch (i)
 580         {
 581         default: /* to avoid warnings */
 582         case 0:
 583           /* _text */
 584           oname = ".text";
 585           start = true;
 586           break;
 587         case 1:
 588           /* _etext */
 589           oname = ".text";
 590           start = false;
 591           break;
 592         case 2:
 593           /* _data */
 594           oname = ".data";
 595           start = true;
 596           break;
 597         case 3:
 598           /* _edata */
 599           oname = ".data";
 600           start = false;
 601           break;
 602         case 4:
 603         case 5:
 604           /* _end and end */
 605           oname = ".bss";
 606           start = false;
 607           break;
 608         }
 609
 610       os = lang_output_section_find (oname);
 611
 612       if (start)
 613         {
 614           is->header.next = os->children.head;
 615           os->children.head = (lang_statement_union_type *) is;
 616         }
 617       else
 618         {
 619           is->header.next = NULL;
 620           lang_statement_append (&os->children,
 621                                  (lang_statement_union_type *) is,
 622                                  &is->header.next);
 623         }
 624     }
 625 }
 626
 627 /* Read an import or export file.  For an import file, this is called
 628    by the before_allocation emulation routine.  For an export file,
 629    this is called by the parse_args emulation routine.  */
 630
 631 static void
 632 gld${EMULATION_NAME}_read_file (filename, import)
 633      const char *filename;
 634      boolean import;
 635 {
 636   struct obstack *o;
 637   FILE *f;
 638   int lineno;
 639   int c;
 640   boolean keep;
 641   const char *imppath;
 642   const char *impfile;
 643   const char *impmember;
 644
 645   o = (struct obstack *) xmalloc (sizeof (struct obstack));
 646   obstack_specify_allocation (o, 0, 0, xmalloc, gld${EMULATION_NAME}_free);
 647
 648   f = fopen (filename, "r");
 649   if (f == NULL)
 650     {
 651       bfd_set_error (bfd_error_system_call);
 652       einfo ("%F%s: %E\n", filename);
 653     }
 654
 655   keep = false;
 656
 657   imppath = NULL;
 658   impfile = NULL;
 659   impmember = NULL;
 660
 661   lineno = 0;
 662   while ((c = getc (f)) != EOF)
 663     {
 664       char *s;
 665       char *symname;
 666       boolean syscall;
 667       bfd_vma address;
 668       struct bfd_link_hash_entry *h;
 669
 670       if (c != '\n')
 671         {
 672           obstack_1grow (o, c);
 673           continue;
 674         }
 675
 676       obstack_1grow (o, '\0');
 677       ++lineno;
 678
 679       s = (char *) obstack_base (o);
 680       while (isspace ((unsigned char) *s))
 681         ++s;
 682       if (*s == '\0'
 683           || *s == '*'
 684           || (*s == '#' && s[1] == ' ')
 685           || (! import && *s == '#' && s[1] == '!'))
 686         {
 687           obstack_free (o, obstack_base (o));
 688           continue;
 689         }
 690
 691       if (*s == '#' && s[1] == '!')
 692         {
 693           s += 2;
 694           while (isspace ((unsigned char) *s))
 695             ++s;
 696           if (*s == '\0')
 697             {
 698               imppath = NULL;
 699               impfile = NULL;
 700               impmember = NULL;
 701               obstack_free (o, obstack_base (o));
 702             }
 703           else if (*s == '(')
 704             einfo ("%F%s%d: #! ([member]) is not supported in import files",
 705                    filename, lineno);
 706           else
 707             {
 708               char cs;
 709               char *file;
 710
 711               (void) obstack_finish (o);
 712               keep = true;
 713               imppath = s;
 714               impfile = NULL;
 715               while (! isspace ((unsigned char) *s) && *s != '(' && *s != '\0')
 716                 {
 717                   if (*s == '/')
 718                     file = s + 1;
 719                   ++s;
 720                 }
 721               if (file != NULL)
 722                 {
 723                   file[-1] = '\0';
 724                   impfile = file;
 725                   if (imppath == file - 1)
 726                     imppath = "/";
 727                 }
 728               else
 729                 {
 730                   impfile = imppath;
 731                   imppath = "";
 732                 }
 733               cs = *s;
 734               *s = '\0';
 735               while (isspace ((unsigned char) cs))
 736                 {
 737                   ++s;
 738                   cs = *s;
 739                 }
 740               if (cs != '(')
 741                 {
 742                   impmember = "";
 743                   if (cs != '\0')
 744                     einfo ("%s:%d: warning: syntax error in import file\n",
 745                            filename, lineno);
 746                 }
 747               else
 748                 {
 749                   ++s;
 750                   impmember = s;
 751                   while (*s != ')' && *s != '\0')
 752                     ++s;
 753                   if (*s == ')')
 754                     *s = '\0';
 755                   else
 756                     einfo ("%s:%d: warning: syntax error in import file\n",
 757                            filename, lineno);
 758                 }
 759             }
 760
 761           continue;
 762         }
 763
 764       /* This is a symbol to be imported or exported.  */
 765       symname = s;
 766       syscall = false;
 767       address = (bfd_vma) -1;
 768
 769       while (! isspace ((unsigned char) *s) && *s != '\0')
 770         ++s;
 771       if (*s != '\0')
 772         {
 773           char *se;
 774
 775           *s++ = '\0';
 776
 777           while (isspace ((unsigned char) *s))
 778             ++s;
 779
 780           se = s;
 781           while (! isspace ((unsigned char) *se) && *se != '\0')
 782             ++se;
 783           if (*se != '\0')
 784             {
 785               *se++ = '\0';
 786               while (isspace ((unsigned char) *se))
 787                 ++se;
 788               if (*se != '\0')
 789                 einfo ("%s%d: warning: syntax error in import/export file\n",
 790                        filename, lineno);
 791             }
 792
 793           if (strcasecmp (s, "svc") == 0
 794               || strcasecmp (s, "syscall") == 0)
 795             syscall = true;
 796           else
 797             {
 798               char *end;
 799
 800               address = strtoul (s, &end, 0);
 801               if (*end != '\0')
 802                 einfo ("%s:%d: warning: syntax error in import/export file\n",
 803                        filename, lineno);
 804             }
 805         }
 806
 807       if (! import)
 808         {
 809           struct export_symbol_list *n;
 810
 811           ldlang_add_undef (symname);
 812           n = ((struct export_symbol_list *)
 813                xmalloc (sizeof (struct export_symbol_list)));
 814           n->next = export_symbols;
 815           n->name = buystring (symname);
 816           n->syscall = syscall;
 817           export_symbols = n;
 818         }
 819       else
 820         {
 821           h = bfd_link_hash_lookup (link_info.hash, symname, false, false,
 822                                     true);
 823           if (h == NULL || h->type == bfd_link_hash_new)
 824             {
 825               /* We can just ignore attempts to import an unreferenced
 826                  symbol.  */
 827             }
 828           else
 829             {
 830               if (! bfd_xcoff_import_symbol (output_bfd, &link_info, h,
 831                                              address, imppath, impfile,
 832                                              impmember))
 833                 einfo ("%X%s:%d: failed to import symbol %s: %E\n",
 834                        filename, lineno, symname);
 835             }
 836         }
 837
 838       obstack_free (o, obstack_base (o));
 839     }
 840
 841   if (obstack_object_size (o) > 0)
 842     {
 843       einfo ("%s:%d: warning: ignoring unterminated last line\n",
 844              filename, lineno);
 845       obstack_free (o, obstack_base (o));
 846     }
 847
 848   if (! keep)
 849     {
 850       obstack_free (o, NULL);
 851       free (o);
 852     }
 853 }
 854
 855 /* This routine saves us from worrying about declaring free.  */
 856
 857 static void
 858 gld${EMULATION_NAME}_free (p)
 859      PTR p;
 860 {
 861   free (p);
 862 }
 863
 864 /* This is called by the before_allocation routine via
 865    lang_for_each_statement.  It looks for relocations and assignments
 866    to symbols.  */
 867
 868 static void
 869 gld${EMULATION_NAME}_find_relocs (s)
 870      lang_statement_union_type *s;
 871 {
 872   if (s->header.type == lang_reloc_statement_enum)
 873     {
 874       lang_reloc_statement_type *rs;
 875
 876       rs = &s->reloc_statement;
 877       if (rs->name == NULL)
 878         einfo ("%F%P: only relocations against symbols are permitted\n");
 879       if (! bfd_xcoff_link_count_reloc (output_bfd, &link_info, rs->name))
 880         einfo ("%F%P: bfd_xcoff_link_count_reloc failed: %E\n");
 881     }
 882
 883   if (s->header.type == lang_assignment_statement_enum)
 884     gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
 885 }
 886
 887 /* Look through an expression for an assignment statement.  */
 888
 889 static void
 890 gld${EMULATION_NAME}_find_exp_assignment (exp)
 891      etree_type *exp;
 892 {
 893   struct bfd_link_hash_entry *h;
 894
 895   switch (exp->type.node_class)
 896     {
 897     case etree_provide:
 898       h = bfd_link_hash_lookup (link_info.hash, exp->assign.dst,
 899                                 false, false, false);
 900       if (h == NULL)
 901         break;
 902       /* Fall through.  */
 903     case etree_assign:
 904       if (strcmp (exp->assign.dst, ".") != 0)
 905         {
 906           if (! bfd_xcoff_record_link_assignment (output_bfd, &link_info,
 907                                                   exp->assign.dst))
 908             einfo ("%P%F: failed to record assignment to %s: %E\n",
 909                    exp->assign.dst);
 910         }
 911       gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
 912       break;
 913
 914     case etree_binary:
 915       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
 916       gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
 917       break;
 918
 919     case etree_trinary:
 920       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
 921       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
 922       gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
 923       break;
 924
 925     case etree_unary:
 926       gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
 927       break;
 928
 929     default:
 930       break;
 931     }
 932 }
 933
 934 static char *
 935 gld${EMULATION_NAME}_get_script(isfile)
 936      int *isfile;
 937 EOF
 938
 939 if test -n "$COMPILE_IN"
 940 then
 941 # Scripts compiled in.
 942
 943 # sed commands to quote an ld script as a C string.
 944 sc="-f ${srcdir}/emultempl/stringify.sed"
 945
 946 cat >>e${EMULATION_NAME}.c <<EOF
 947 {
 948   *isfile = 0;
 949
 950   if (link_info.relocateable == true && config.build_constructors == true)
 951     return
 952 EOF
 953 sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
 954 echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
 955 sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
 956 echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
 957 sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
 958 echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
 959 sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
 960 echo '  ; else return'                                     >> e${EMULATION_NAME}.c
 961 sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
 962 echo '; }'                                                 >> e${EMULATION_NAME}.c
 963
 964 else
 965 # Scripts read from the filesystem.
 966
 967 cat >>e${EMULATION_NAME}.c <<EOF
 968 {
 969   *isfile = 1;
 970
 971   if (link_info.relocateable == true && config.build_constructors == true)
 972     return "ldscripts/${EMULATION_NAME}.xu";
 973   else if (link_info.relocateable == true)
 974     return "ldscripts/${EMULATION_NAME}.xr";
 975   else if (!config.text_read_only)
 976     return "ldscripts/${EMULATION_NAME}.xbn";
 977   else if (!config.magic_demand_paged)
 978     return "ldscripts/${EMULATION_NAME}.xn";
 979   else
 980     return "ldscripts/${EMULATION_NAME}.x";
 981 }
 982 EOF
 983
 984 fi
 985
 986 cat >>e${EMULATION_NAME}.c <<EOF
 987
 988 struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
 989 {
 990   gld${EMULATION_NAME}_before_parse,
 991   syslib_default,
 992   hll_default,
 993   after_parse_default,
 994   gld${EMULATION_NAME}_after_open,
 995   after_allocation_default,
 996   set_output_arch_default,
 997   ldemul_default_target,
 998   gld${EMULATION_NAME}_before_allocation,
 999   gld${EMULATION_NAME}_get_script,
1000   "${EMULATION_NAME}",
1001   "${OUTPUT_FORMAT}",
1002   0,    /* finish */
1003   0,    /* create_output_section_statements */
1004   0,    /* open_dynamic_archive */
1005   0,    /* place_orphan */
1006   0,    /* set_symbols */
1007   gld${EMULATION_NAME}_parse_args,
1008 };
1009 EOF