armcoff.em revision 130562 
1# This shell script emits a C file. -*- C -*-
2# It does some substitutions.
3cat >e${EMULATION_NAME}.c <<EOF
4/* This file is is generated by a shell script.  DO NOT EDIT! */
5
6/* emulate the original gld for the given ${EMULATION_NAME}
7   Copyright 1991, 1993, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
8   2004 Free Software Foundation, Inc.
9   Written by Steve Chamberlain steve@cygnus.com
10
11This file is part of GLD, the Gnu Linker.
12
13This program is free software; you can redistribute it and/or modify
14it under the terms of the GNU General Public License as published by
15the Free Software Foundation; either version 2 of the License, or
16(at your option) any later version.
17
18This program is distributed in the hope that it will be useful,
19but WITHOUT ANY WARRANTY; without even the implied warranty of
20MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21GNU General Public License for more details.
22
23You should have received a copy of the GNU General Public License
24along with this program; if not, write to the Free Software
25Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
26
27#define TARGET_IS_${EMULATION_NAME}
28
29#include "bfd.h"
30#include "sysdep.h"
31#include "bfdlink.h"
32#include "getopt.h"
33
34#include "ld.h"
35#include "ldmain.h"
36#include "ldmisc.h"
37
38#include "ldexp.h"
39#include "ldlang.h"
40#include "ldfile.h"
41#include "ldemul.h"
42
43/* If TRUE, then interworking stubs which support calls to old,
44   non-interworking aware ARM code should be generated.  */
45
46static int support_old_code = 0;
47static char * thumb_entry_symbol = NULL;
48
49#define OPTION_SUPPORT_OLD_CODE		300
50#define OPTION_THUMB_ENTRY		301
51
52static void
53gld${EMULATION_NAME}_add_options
54  (int ns ATTRIBUTE_UNUSED, char **shortopts ATTRIBUTE_UNUSED, int nl,
55   struct option **longopts, int nrl ATTRIBUTE_UNUSED,
56   struct option **really_longopts ATTRIBUTE_UNUSED)
57{
58  static const struct option xtra_long[] = {
59    {"support-old-code", no_argument, NULL, OPTION_SUPPORT_OLD_CODE},
60    {"thumb-entry", required_argument, NULL, OPTION_THUMB_ENTRY},
61    {NULL, no_argument, NULL, 0}
62  };
63
64  *longopts = xrealloc (*longopts,
65			nl * sizeof (struct option) + sizeof (xtra_long));
66  memcpy (*longopts + nl, &xtra_long, sizeof (xtra_long));
67}
68
69static void
70gld${EMULATION_NAME}_list_options (FILE *file)
71{
72  fprintf (file, _("  --support-old-code   Support interworking with old code\n"));
73  fprintf (file, _("  --thumb-entry=<sym>  Set the entry point to be Thumb symbol <sym>\n"));
74}
75
76static bfd_boolean
77gld${EMULATION_NAME}_handle_option (int optc)
78{
79  switch (optc)
80    {
81    default:
82      return FALSE;
83
84    case OPTION_SUPPORT_OLD_CODE:
85      support_old_code = 1;
86      break;
87
88    case OPTION_THUMB_ENTRY:
89      thumb_entry_symbol = optarg;
90      break;
91    }
92
93  return TRUE;
94}
95
96static void
97gld${EMULATION_NAME}_before_parse (void)
98{
99#ifndef TARGET_			/* I.e., if not generic.  */
100  ldfile_set_output_arch ("`echo ${ARCH}`", bfd_arch_unknown);
101#endif /* not TARGET_ */
102}
103
104/* This is called after the sections have been attached to output
105   sections, but before any sizes or addresses have been set.  */
106
107static void
108gld${EMULATION_NAME}_before_allocation (void)
109{
110  /* we should be able to set the size of the interworking stub section */
111
112  /* Here we rummage through the found bfds to collect glue information */
113  /* FIXME: should this be based on a command line option? krk@cygnus.com */
114  {
115    LANG_FOR_EACH_INPUT_STATEMENT (is)
116      {
117	if (! bfd_arm_process_before_allocation
118	    (is->the_bfd, & link_info, support_old_code))
119	  {
120	    /* xgettext:c-format */
121	    einfo (_("Errors encountered processing file %s"), is->filename);
122	  }
123      }
124  }
125
126  /* We have seen it all. Allocate it, and carry on */
127  bfd_arm_allocate_interworking_sections (& link_info);
128}
129
130static void
131gld${EMULATION_NAME}_after_open (void)
132{
133  if (strstr (bfd_get_target (output_bfd), "arm") == NULL)
134    {
135      /* The arm backend needs special fields in the output hash structure.
136	 These will only be created if the output format is an arm format,
137	 hence we do not support linking and changing output formats at the
138	 same time.  Use a link followed by objcopy to change output formats.  */
139      einfo ("%F%X%P: error: cannot change output format whilst linking ARM binaries\n");
140      return;
141    }
142
143  {
144    LANG_FOR_EACH_INPUT_STATEMENT (is)
145      {
146	if (bfd_arm_get_bfd_for_interworking (is->the_bfd, & link_info))
147	  break;
148      }
149  }
150}
151
152static void
153gld${EMULATION_NAME}_finish (void)
154{
155  struct bfd_link_hash_entry * h;
156
157  if (thumb_entry_symbol == NULL)
158    return;
159
160  h = bfd_link_hash_lookup (link_info.hash, thumb_entry_symbol,
161			    FALSE, FALSE, TRUE);
162
163  if (h != (struct bfd_link_hash_entry *) NULL
164      && (h->type == bfd_link_hash_defined
165	  || h->type == bfd_link_hash_defweak)
166      && h->u.def.section->output_section != NULL)
167    {
168      static char buffer[32];
169      bfd_vma val;
170
171      /* Special procesing is required for a Thumb entry symbol.  The
172	 bottom bit of its address must be set.  */
173      val = (h->u.def.value
174	     + bfd_get_section_vma (output_bfd,
175				    h->u.def.section->output_section)
176	     + h->u.def.section->output_offset);
177
178      val |= 1;
179
180      /* Now convert this value into a string and store it in entry_symbol
181	 where the lang_finish() function will pick it up.  */
182      buffer[0] = '0';
183      buffer[1] = 'x';
184
185      sprintf_vma (buffer + 2, val);
186
187      if (entry_symbol.name != NULL && entry_from_cmdline)
188	einfo (_("%P: warning: '--thumb-entry %s' is overriding '-e %s'\n"),
189	       thumb_entry_symbol, entry_symbol.name);
190      entry_symbol.name = buffer;
191    }
192  else
193    einfo (_("%P: warning: connot find thumb start symbol %s\n"), thumb_entry_symbol);
194}
195
196static char *
197gld${EMULATION_NAME}_get_script (int *isfile)
198EOF
199
200if test -n "$COMPILE_IN"
201then
202# Scripts compiled in.
203
204# sed commands to quote an ld script as a C string.
205sc="-f stringify.sed"
206
207cat >>e${EMULATION_NAME}.c <<EOF
208{
209  *isfile = 0;
210
211  if (link_info.relocatable && config.build_constructors)
212    return
213EOF
214sed $sc ldscripts/${EMULATION_NAME}.xu                 >> e${EMULATION_NAME}.c
215echo '  ; else if (link_info.relocatable) return'     >> e${EMULATION_NAME}.c
216sed $sc ldscripts/${EMULATION_NAME}.xr                 >> e${EMULATION_NAME}.c
217echo '  ; else if (!config.text_read_only) return'     >> e${EMULATION_NAME}.c
218sed $sc ldscripts/${EMULATION_NAME}.xbn                >> e${EMULATION_NAME}.c
219echo '  ; else if (!config.magic_demand_paged) return' >> e${EMULATION_NAME}.c
220sed $sc ldscripts/${EMULATION_NAME}.xn                 >> e${EMULATION_NAME}.c
221echo '  ; else return'                                 >> e${EMULATION_NAME}.c
222sed $sc ldscripts/${EMULATION_NAME}.x                  >> e${EMULATION_NAME}.c
223echo '; }'                                             >> e${EMULATION_NAME}.c
224
225else
226# Scripts read from the filesystem.
227
228cat >>e${EMULATION_NAME}.c <<EOF
229{
230  *isfile = 1;
231
232  if (link_info.relocatable && config.build_constructors)
233    return "ldscripts/${EMULATION_NAME}.xu";
234  else if (link_info.relocatable)
235    return "ldscripts/${EMULATION_NAME}.xr";
236  else if (!config.text_read_only)
237    return "ldscripts/${EMULATION_NAME}.xbn";
238  else if (!config.magic_demand_paged)
239    return "ldscripts/${EMULATION_NAME}.xn";
240  else
241    return "ldscripts/${EMULATION_NAME}.x";
242}
243EOF
244
245fi
246
247cat >>e${EMULATION_NAME}.c <<EOF
248
249struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation =
250{
251  gld${EMULATION_NAME}_before_parse,
252  syslib_default,
253  hll_default,
254  after_parse_default,
255  gld${EMULATION_NAME}_after_open,
256  after_allocation_default,
257  set_output_arch_default,
258  ldemul_default_target,
259  gld${EMULATION_NAME}_before_allocation,
260  gld${EMULATION_NAME}_get_script,
261  "${EMULATION_NAME}",
262  "${OUTPUT_FORMAT}",
263  gld${EMULATION_NAME}_finish,
264  NULL,	/* create output section statements */
265  NULL,	/* open dynamic archive */
266  NULL,	/* place orphan */
267  NULL,	/* set symbols */
268  NULL, /* parse_args */
269  gld${EMULATION_NAME}_add_options,
270  gld${EMULATION_NAME}_handle_option,
271  NULL,	/* unrecognised file */
272  gld${EMULATION_NAME}_list_options,
273  NULL,	/* recognized file */
274  NULL,	/* find_potential_libraries */
275  NULL	/* new_vers_pattern */
276};
277EOF
278