source: rtems-tools/linkers/rtems-ld.cpp @ 9b66527

4.104.115
Last change on this file since 9b66527 was 9b66527, checked in by Chris Johns <chrisj@…>, on 11/19/12 at 02:13:52

Only look for standard library paths if standard libraries and enabled.

  • Property mode set to 100644
File size: 12.0 KB
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1/*
2 * Copyright (c) 2011-2012, Chris Johns <chrisj@rtems.org>
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16/**
17 * @file
18 *
19 * @ingroup rtems_rld
20 *
21 * @brief RTEMS Linker Main manages opions, sequence of operations and exceptions.
22 *
23 */
24
25#if HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <iostream>
30
31#include <cxxabi.h>
32#include <signal.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36
37#include <getopt.h>
38
39#include <rld.h>
40#include <rld-cc.h>
41#include <rld-outputter.h>
42#include <rld-process.h>
43#include <rld-resolver.h>
44
45#ifndef HAVE_KILL
46#define kill(p,s) raise(s)
47#endif
48
49/**
50 * RTEMS Linker options. This needs to be rewritten to be like cc where only a
51 * single '-' and long options is present.
52 */
53static struct option rld_opts[] = {
54  { "help",        no_argument,            NULL,           'h' },
55  { "version",     no_argument,            NULL,           'V' },
56  { "verbose",     no_argument,            NULL,           'v' },
57  { "warn",        no_argument,            NULL,           'w' },
58  { "map",         no_argument,            NULL,           'M' },
59  { "output",      required_argument,      NULL,           'o' },
60  { "script",      no_argument,            NULL,           'S' },
61  { "lib-path",    required_argument,      NULL,           'L' },
62  { "lib",         required_argument,      NULL,           'l' },
63  { "no-stdlibs",  no_argument,            NULL,           'n' },
64  { "entry",       required_argument,      NULL,           'e' },
65  { "define",      required_argument,      NULL,           'd' },
66  { "undefined",   required_argument,      NULL,           'u' },
67  { "base",        required_argument,      NULL,           'b' },
68  { "cc",          required_argument,      NULL,           'C' },
69  { "exec-prefix", required_argument,      NULL,           'E' },
70  { "march",       required_argument,      NULL,           'a' },
71  { "mcpu",        required_argument,      NULL,           'c' },
72  { NULL,          0,                      NULL,            0 }
73};
74
75#if TO_BE_USED_FOR_THE_UNDEFINES
76void
77split_on_equals (const std::string& opt, std::string& left, std::string& right)
78{
79  std::string::size_type eq = opt.find_first_of('=');
80}
81#endif
82
83void
84usage (int exit_code)
85{
86  std::cout << "rtems-ld [options] objects" << std::endl
87            << "Options and arguments:" << std::endl
88            << " -h        : help (also --help)" << std::endl
89            << " -V        : print linker version number and exit (also --version)" << std::endl
90            << " -v        : verbose (trace import parts), can be supply multiple times" << std::endl
91            << "             to increase verbosity (also --verbose)" << std::endl
92            << " -w        : generate warnings (also --warn)" << std::endl
93            << " -M        : generate map output (also --map)" << std::endl
94            << " -o file   : linker output is written to file (also --output)" << std::endl
95            << " -S        : linker output is a script file (also --script)" << std::endl
96            << " -L path   : path to a library, add multiple for more than" << std::endl
97            << "             one path (also --lib-path)" << std::endl
98            << " -l lib    : add lib to the libraries searched, add multiple" << std::endl
99            << "             for more than one library (also --lib)" << std::endl
100            << " -n        : do not search standard libraries (also --no-stdlibs)" << std::endl
101            << " -e entry  : entry point symbol (also --entry)" << std::endl
102            << " -d sym    : add the symbol definition, add multiple with" << std::endl
103            << "             more than one define (also --define)" << std::endl
104            << " -u sym    : add the undefined symbol definition, add multiple" << std::endl
105            << "             for more than one undefined symbol (also --undefined)" << std::endl
106            << " -b elf    : read the ELF file symbols as the base RTEMS kernel" << std::endl
107            << "             image (also --base)" << std::endl
108            << " -C file   : execute file as the target C compiler (also --cc)" << std::endl
109            << " -E prefix : the RTEMS tool prefix (also --exec-prefix)" << std::endl
110            << " -a march  : machine architecture (also --march)" << std::endl
111            << " -c cpu    : machine architecture's CPU (also --mcpu)" << std::endl;
112  ::exit (exit_code);
113}
114
115static void
116fatal_signal (int signum)
117{
118  signal (signum, SIG_DFL);
119
120  rld::process::temporaries.clean_up ();
121
122  /*
123   * Get the same signal again, this time not handled, so its normal effect
124   * occurs.
125   */
126  kill (getpid (), signum);
127}
128
129static void
130setup_signals (void)
131{
132  if (signal (SIGINT, SIG_IGN) != SIG_IGN)
133    signal (SIGINT, fatal_signal);
134#ifdef SIGHUP
135  if (signal (SIGHUP, SIG_IGN) != SIG_IGN)
136    signal (SIGHUP, fatal_signal);
137#endif
138  if (signal (SIGTERM, SIG_IGN) != SIG_IGN)
139    signal (SIGTERM, fatal_signal);
140#ifdef SIGPIPE
141  if (signal (SIGPIPE, SIG_IGN) != SIG_IGN)
142    signal (SIGPIPE, fatal_signal);
143#endif
144#ifdef SIGCHLD
145  signal (SIGCHLD, SIG_DFL);
146#endif
147}
148
149int
150main (int argc, char* argv[])
151{
152  int ec = 0;
153
154  setup_signals ();
155
156  try
157  {
158    rld::files::cache    cache;
159    rld::files::cache    base;
160    rld::files::paths    libpaths;
161    rld::files::paths    libs;
162    rld::files::paths    objects;
163    rld::files::paths    libraries;
164    rld::symbols::bucket defines;
165    rld::symbols::bucket undefines;
166    rld::symbols::table  base_symbols;
167    rld::symbols::table  symbols;
168    rld::symbols::table  undefined;
169    std::string          entry;
170    std::string          output = "a.out";
171    std::string          base_name;
172    std::string          cc_name;
173    bool                 script = false;
174    bool                 standard_libs = true;
175    bool                 exec_prefix_set = false;
176    bool                 map = false;
177    bool                 warnings = false;
178
179    libpaths.push_back (".");
180
181    while (true)
182    {
183      int opt = ::getopt_long (argc, argv, "hvwVMnSb:E:o:L:l:a:c:e:d:u:C:", rld_opts, NULL);
184      if (opt < 0)
185        break;
186
187      switch (opt)
188      {
189        case 'V':
190          std::cout << "rtems-ld (RTEMS Linker) " << rld::version ()
191                    << std::endl;
192          ::exit (0);
193          break;
194
195        case 'v':
196          rld::verbose_inc ();
197          break;
198
199        case 'M':
200          map = true;
201          break;
202
203        case 'w':
204          warnings = true;
205          break;
206
207        case 'o':
208          if (output != "a.out")
209            std::cerr << "warning: output already set" << std::endl;
210          output = optarg;
211          break;
212
213        case 'S':
214          script = true;
215          break;
216
217        case 'l':
218          /*
219           * The order is important. It is the search order.
220           */
221          libs.push_back (optarg);
222          break;
223
224        case 'L':
225          if ((optarg[::strlen (optarg) - 1] == '/') ||
226              (optarg[::strlen (optarg) - 1] == '\\'))
227            optarg[::strlen (optarg) - 1] = '\0';
228          libpaths.push_back (optarg);
229          break;
230
231        case 'n':
232          standard_libs = false;
233          break;
234
235        case 'C':
236          if (exec_prefix_set == true)
237            std::cerr << "warning: exec-prefix ignored when CC provided" << std::endl;
238          rld::cc::cc = optarg;
239          break;
240
241        case 'E':
242          exec_prefix_set = true;
243          rld::cc::exec_prefix = optarg;
244          break;
245
246        case 'a':
247          rld::cc::march = optarg;
248          break;
249
250        case 'c':
251          rld::cc::mcpu = optarg;
252          break;
253
254        case 'e':
255          entry = optarg;
256          break;
257
258        case 'd':
259          defines.push_back (rld::symbols::symbol (optarg));
260          break;
261
262        case 'u':
263          undefines.push_back (rld::symbols::symbol (optarg));
264          break;
265
266        case 'b':
267          base_name = optarg;
268          break;
269
270        case '?':
271          usage (3);
272          break;
273
274        case 'h':
275          usage (0);
276          break;
277      }
278    }
279
280    argc -= optind;
281    argv += optind;
282
283    if (rld::verbose () || map)
284      std::cout << "RTEMS Linker " << rld::version () << std::endl;
285
286    /*
287     * If there are no object files there is nothing to link.
288     */
289    if ((argc == 0) && !map)
290      throw rld::error ("no object files", "options");
291
292    /*
293     * Load the remaining command line arguments into the cache as object
294     * files.
295     */
296    while (argc--)
297      objects.push_back (*argv++);
298
299    /*
300     * Load the symbol table with the defined symbols from the defines bucket.
301     */
302    rld::symbols::load (defines, symbols);
303
304    /*
305     * Load the undefined table with the undefined symbols from the undefines
306     * bucket.
307     */
308    rld::symbols::load (undefines, undefined);
309
310    /*
311     * Add the object files to the cache.
312     */
313    cache.add (objects);
314
315    /*
316     * Open the cache.
317     */
318    cache.open ();
319
320    /*
321     * If the full path to CC is not provided and the exec-prefix is not set by
322     * the command line see if it can be detected from the object file
323     * types. This must be after we have added the object files because they
324     * are used when detecting.
325     */
326    if (rld::cc::cc.empty () && !exec_prefix_set)
327      rld::cc::exec_prefix = rld::elf::machine_type ();
328
329    /*
330     * If we have a base image add it.
331     */
332    if (base_name.length ())
333    {
334      base.open ();
335      base.add (base_name);
336      base.load_symbols (base_symbols, true);
337    }
338
339    /*
340     * Get the standard library paths
341     */
342    if (standard_libs)
343      rld::cc::get_standard_libpaths (libpaths);
344
345    /*
346     * Get the command line libraries.
347     */
348    rld::files::find_libraries (libraries, libpaths, libs);
349
350    /*
351     * Are we to load standard libraries ?
352     */
353    if (standard_libs)
354      rld::cc::get_standard_libs (libraries, libpaths);
355
356    /*
357     * Load the library to the cache.
358     */
359    cache.add_libraries (libraries);
360
361    /*
362     * Load the symbol table.
363     */
364    cache.load_symbols (symbols);
365
366    /*
367     * Map ?
368     */
369    if (map)
370    {
371      if (base_name.length ())
372        rld::map (base, base_symbols);
373      rld::map (cache, symbols);
374    }
375
376    if (cache.path_count ())
377    {
378      /*
379       * This structure allows us to add different operations with the same
380       * structure.
381       */
382      rld::files::object_list dependents;
383      rld::resolver::resolve (dependents, cache, base_symbols, symbols, undefined);
384
385      /**
386       * Output the file.
387       */
388      if (script)
389        rld::outputter::script (output, dependents, cache);
390      else
391        rld::outputter::archive (output, dependents, cache);
392
393      /**
394       * Check for warnings.
395       */
396      if (warnings)
397      {
398        rld::warn_unused_externals (dependents);
399      }
400    }
401  }
402  catch (rld::error re)
403  {
404    std::cerr << "error: "
405              << re.where << ": " << re.what
406              << std::endl;
407    ec = 10;
408  }
409  catch (std::exception e)
410  {
411    int   status;
412    char* realname;
413    realname = abi::__cxa_demangle (e.what(), 0, 0, &status);
414    std::cerr << "error: exception: " << realname << " [";
415    ::free (realname);
416    const std::type_info &ti = typeid (e);
417    realname = abi::__cxa_demangle (ti.name(), 0, 0, &status);
418    std::cerr << realname << "] " << e.what () << std::endl;
419    ::free (realname);
420    ec = 11;
421  }
422  catch (...)
423  {
424    /*
425     * Helps to know if this happens.
426     */
427    std::cout << "error: unhandled exception" << std::endl;
428    ec = 12;
429  }
430
431  return ec;
432}
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