linux.em revision 78828 
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/* Linux a.out emulation code for ${EMULATION_NAME}
7   Copyright 1991, 1993, 1994, 1995, 1996, 1998, 1999, 2000
8   Free Software Foundation, Inc.
9   Written by Steve Chamberlain <sac@cygnus.com>
10   Linux support by Eric Youngdale <ericy@cais.cais.com>
11
12This file is part of GLD, the Gnu Linker.
13
14This program is free software; you can redistribute it and/or modify
15it under the terms of the GNU General Public License as published by
16the Free Software Foundation; either version 2 of the License, or
17(at your option) any later version.
18
19This program is distributed in the hope that it will be useful,
20but WITHOUT ANY WARRANTY; without even the implied warranty of
21MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22GNU General Public License for more details.
23
24You should have received a copy of the GNU General Public License
25along with this program; if not, write to the Free Software
26Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
27
28#define TARGET_IS_${EMULATION_NAME}
29
30#include "bfd.h"
31#include "sysdep.h"
32#include "bfdlink.h"
33
34#include "ld.h"
35#include "ldmain.h"
36#include "ldmisc.h"
37#include "ldexp.h"
38#include "ldlang.h"
39#include "ldfile.h"
40#include "ldemul.h"
41
42static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
43static boolean gld${EMULATION_NAME}_open_dynamic_archive
44  PARAMS ((const char *, search_dirs_type *, lang_input_statement_type *));
45static void gld${EMULATION_NAME}_find_address_statement
46  PARAMS ((lang_statement_union_type *));
47static void gld${EMULATION_NAME}_create_output_section_statements
48  PARAMS ((void));
49static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
50static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
51
52static void
53gld${EMULATION_NAME}_before_parse()
54{
55  ldfile_output_architecture = bfd_arch_${ARCH};
56  config.dynamic_link = true;
57  config.has_shared = true;
58}
59
60/* Try to open a dynamic archive.  This is where we know that Linux
61   dynamic libraries have an extension of .sa.  */
62
63static boolean
64gld${EMULATION_NAME}_open_dynamic_archive (arch, search, entry)
65     const char *arch;
66     search_dirs_type *search;
67     lang_input_statement_type *entry;
68{
69  char *string;
70
71  if (! entry->is_archive)
72    return false;
73
74  string = (char *) xmalloc (strlen (search->name)
75			     + strlen (entry->filename)
76			     + strlen (arch)
77			     + sizeof "/lib.sa");
78
79  sprintf (string, "%s/lib%s%s.sa", search->name, entry->filename, arch);
80
81  if (! ldfile_try_open_bfd (string, entry))
82    {
83      free (string);
84      return false;
85    }
86
87  entry->filename = string;
88
89  return true;
90}
91
92/* This is called by the create_output_section_statements routine via
93   lang_for_each_statement.  It locates any address assignment to
94   .text, and modifies it to include the size of the headers.  This
95   causes -Ttext to mean the starting address of the header, rather
96   than the starting address of .text, which is compatible with other
97   Linux tools.  */
98
99static void
100gld${EMULATION_NAME}_find_address_statement (s)
101     lang_statement_union_type *s;
102{
103  if (s->header.type == lang_address_statement_enum
104      && strcmp (s->address_statement.section_name, ".text") == 0)
105    {
106      ASSERT (s->address_statement.address->type.node_class == etree_value);
107      s->address_statement.address->value.value += 0x20;
108    }
109}
110
111/* This is called before opening the input BFD's.  */
112
113static void
114gld${EMULATION_NAME}_create_output_section_statements ()
115{
116  lang_for_each_statement (gld${EMULATION_NAME}_find_address_statement);
117}
118
119/* This is called after the sections have been attached to output
120   sections, but before any sizes or addresses have been set.  */
121
122static void
123gld${EMULATION_NAME}_before_allocation ()
124{
125  if (link_info.relocateable)
126    return;
127
128  /* Let the backend work out the sizes of any sections required by
129     dynamic linking.  */
130  if (! bfd_${EMULATION_NAME}_size_dynamic_sections (output_bfd, &link_info))
131    einfo ("%P%F: failed to set dynamic section sizes: %E\n");
132}
133
134static char *
135gld${EMULATION_NAME}_get_script(isfile)
136     int *isfile;
137EOF
138
139if test -n "$COMPILE_IN"
140then
141# Scripts compiled in.
142
143# sed commands to quote an ld script as a C string.
144sc="-f stringify.sed"
145
146cat >>e${EMULATION_NAME}.c <<EOF
147{			     
148  *isfile = 0;
149
150  if (link_info.relocateable == true && config.build_constructors == true)
151    return
152EOF
153sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
154echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
155sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
156echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
157sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
158echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
159sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
160echo '  ; else return'                                     >> e${EMULATION_NAME}.c
161sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
162echo '; }'                                                 >> e${EMULATION_NAME}.c
163
164else
165# Scripts read from the filesystem.
166
167cat >>e${EMULATION_NAME}.c <<EOF
168{			     
169  *isfile = 1;
170
171  if (link_info.relocateable == true && config.build_constructors == true)
172    return "ldscripts/${EMULATION_NAME}.xu";
173  else if (link_info.relocateable == true)
174    return "ldscripts/${EMULATION_NAME}.xr";
175  else if (!config.text_read_only)
176    return "ldscripts/${EMULATION_NAME}.xbn";
177  else if (!config.magic_demand_paged)
178    return "ldscripts/${EMULATION_NAME}.xn";
179  else
180    return "ldscripts/${EMULATION_NAME}.x";
181}
182EOF
183
184fi
185
186cat >>e${EMULATION_NAME}.c <<EOF
187
188struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
189{
190  gld${EMULATION_NAME}_before_parse,
191  syslib_default,
192  hll_default,
193  after_parse_default,
194  after_open_default,
195  after_allocation_default,
196  set_output_arch_default,
197  ldemul_default_target,
198  gld${EMULATION_NAME}_before_allocation,
199  gld${EMULATION_NAME}_get_script,
200  "${EMULATION_NAME}",
201  "${OUTPUT_FORMAT}",
202  NULL,	/* finish */
203  gld${EMULATION_NAME}_create_output_section_statements,
204  gld${EMULATION_NAME}_open_dynamic_archive,
205  NULL,	/* place orphan */
206  NULL,	/* set symbols */
207  NULL,	/* parse args */
208  NULL,	/* unrecognized file */
209  NULL,	/* list options */
210  NULL,	/* recognized file */
211  NULL 	/* find_potential_libraries */
212};
213EOF
214