Make undefined refs not make an executable

[binutils.git] / ld / ldlnk960.c

/* intel coff loader emulation specific stuff
   Copyright (C) 1991 Free Software Foundation, Inc.
   Written by Steve Chamberlain [email protected]

This file is part of GLD, the Gnu Linker.

GLD 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.

GLD 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 GLD; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*
   $Id$ 
*/

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

/*#include "archures.h"*/
#include "ld.h"
#include "config.h"
#include "ldemul.h"
#include "ldmisc.h"
#include "ldlang.h"
#include "ldfile.h"

extern  boolean lang_float_flag;
extern bfd *output_bfd;



extern enum bfd_architecture ldfile_output_architecture;
extern unsigned long ldfile_output_machine;
extern char *ldfile_output_machine_name;


typedef struct lib_list {
  char *name;
  struct lib_list *next;
} lib_list_type;

static lib_list_type *hll_list;
static lib_list_type **hll_list_tail = &hll_list;

static lib_list_type *syslib_list;
static lib_list_type **syslib_list_tail = &syslib_list;


static void
append(list, name)
lib_list_type ***list;
char *name;
{
  lib_list_type *element = 
    (lib_list_type *)(ldmalloc(sizeof(lib_list_type)));

  element->name = name;
  element->next = (lib_list_type *)NULL;
  **list = element;
  *list = &element->next;

}

static boolean had_hll = false;
static boolean had_hll_name = false;
static void
lnk960_hll(name)
char *name;
{
  had_hll = true;
  if (name != (char *)NULL) {
    had_hll_name = true;
    append(&hll_list_tail, name);
  }
}

static void 
lnk960_syslib(name)
char *name;
{
  append(&syslib_list_tail,name);
}



#ifdef GNU960

static void 
lnk960_before_parse()
{
  static char *env_variables[] = { "G960LIB", "G960BASE", 0 };
  char **p;
  char *env ;

  for ( p = env_variables; *p; p++ ){
    env =  (char *) getenv(*p);
    if (env) {
      ldfile_add_library_path(concat(env,"/lib/libcoff",""));
    }
  }

  env= (char *) getenv("I960BASE");
  if ( env ) {
    ldfile_add_library_path(concat(env,"/lib",""));
  }

  ldfile_output_architecture = bfd_arch_i960;
  ldfile_output_machine = bfd_mach_i960_core;
}

#else	/* not GNU960 */

static void 
lnk960_before_parse()
{
  char *name = getenv("I960BASE");

  if (name == (char *)NULL) {
    name = getenv("G960BASE");
    if (name == (char *)NULL) {
      einfo("%P%F I960BASE and G960BASE not set\n");
    }
  }


  ldfile_add_library_path(concat(name,"/lib",""));
  ldfile_output_architecture = bfd_arch_i960;
  ldfile_output_machine = bfd_mach_i960_core;
}

#endif	/* GNU960 */


static void
add_on(list, search)
lib_list_type *list;
lang_input_file_enum_type search;
{
  while (list) {
    lang_add_input_file(list->name,
			search,
			(char *)NULL);
    list = list->next;
  }
}
static void lnk960_after_parse()
{

  /* If there has been no arch, default to -KB */
  if (ldfile_output_machine_name[0] ==0) {
    ldfile_add_arch("KB");
  }

  /* if there has been no hll list then add our own */
  
  if(had_hll && !had_hll_name) {
    append(&hll_list_tail,"cg");
    if (ldfile_output_machine == bfd_mach_i960_ka_sa ||
  	ldfile_output_machine == bfd_mach_i960_ca) {
        {
	  append(&hll_list_tail,"fpg");
        }
    }
  }
  
  add_on(hll_list, lang_input_file_is_l_enum);
  add_on(syslib_list, lang_input_file_is_search_file_enum);
}

static void
lnk960_before_allocation()
{
}
static void
lnk960_after_allocation()
{
  extern ld_config_type config;
  if (config.relocateable_output == false) {
    lang_abs_symbol_at_end_of(".text","_etext");
    lang_abs_symbol_at_end_of(".data","_edata");
    lang_abs_symbol_at_beginning_of(".bss","_bss_start");
    lang_abs_symbol_at_end_of(".bss","_end");
  }
}


static struct
 {
   unsigned  long number;
   char *name; 
 }
machine_table[] = {
	bfd_mach_i960_core	,"CORE",
	bfd_mach_i960_kb_sb	,"KB",
	bfd_mach_i960_kb_sb	,"SB",
	bfd_mach_i960_mc	,"MC",
	bfd_mach_i960_xa	,"XA",
	bfd_mach_i960_ca	,"CA",
	bfd_mach_i960_ka_sa	,"KA",
	bfd_mach_i960_ka_sa	,"SA",

	bfd_mach_i960_core	,"core",
	bfd_mach_i960_kb_sb	,"kb",
	bfd_mach_i960_kb_sb	,"sb",
	bfd_mach_i960_mc	,"mc",
	bfd_mach_i960_xa	,"xa",
	bfd_mach_i960_ca	,"ca",
	bfd_mach_i960_ka_sa	,"ka",
	bfd_mach_i960_ka_sa	,"sa",
	0,(char *)NULL
};

static void
lnk960_set_output_arch()
{
  /* Set the output architecture and machine if possible */
  unsigned int i;
  ldfile_output_machine = bfd_mach_i960_core;
  for (i= 0; machine_table[i].name != (char*)NULL; i++) {
    if (strcmp(ldfile_output_machine_name,machine_table[i].name)==0) {
      ldfile_output_machine = machine_table[i].number;
      break;
    }
  }
  bfd_set_arch_mach(output_bfd, ldfile_output_architecture, ldfile_output_machine);
}

static char *
lnk960_choose_target()
{
#ifdef GNU960

  return bfd_make_targ_name(BFD_COFF_FORMAT, 0);

#else

  char *from_outside = getenv(TARGET_ENVIRON);
  if (from_outside != (char *)NULL)
    return from_outside;
#ifdef LNK960_LITTLE
  return LNK960_TARGET_LITTLE
#else
  return LNK960_TARGET;
#endif
#endif

}

/* The default script if none is offered */
static char *lnk960_script = 
#include "ldlnk960.x"
;


static char *lnk960_script_relocateable = 
#include "ldlnk960.xr"
;

static char *lnk960_get_script()
{
  extern ld_config_type config;
  if (config.relocateable_output) {
    return lnk960_script_relocateable;
  }
  return lnk960_script;
}
struct ld_emulation_xfer_struct ld_lnk960_emulation = 
{
  lnk960_before_parse,
  lnk960_syslib,
  lnk960_hll,
  lnk960_after_parse,
  lnk960_after_allocation,
  lnk960_set_output_arch,
  lnk960_choose_target,
  lnk960_before_allocation,
  lnk960_get_script,
};