1 /* Offload image generation tool for Intel MIC devices.
3 Copyright (C) 2014-2015 Free Software Foundation, Inc.
5 Contributed by Ilya Verbin <ilya.verbin@intel.com>.
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3, or (at your option)
14 GCC is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
26 #include "coretypes.h"
29 #include "diagnostic.h"
30 #include "collect-utils.h"
31 #include "intelmic-offload.h"
33 const char tool_name[] = "intelmic mkoffload";
35 const char image_section_name[] = ".gnu.offload_images";
36 const char *symbols[3] = { "__offload_image_intelmic_start",
37 "__offload_image_intelmic_end",
38 "__offload_image_intelmic_size" };
39 const char *out_obj_filename = NULL;
42 const int MAX_NUM_TEMPS = 10;
43 const char *temp_files[MAX_NUM_TEMPS];
45 /* Shows if we should compile binaries for i386 instead of x86-64. */
46 bool target_ilp32 = false;
48 /* Delete tempfiles and exit function. */
50 tool_cleanup (bool from_signal ATTRIBUTE_UNUSED)
52 for (int i = 0; i < num_temps; i++)
53 maybe_unlink (temp_files[i]);
57 mkoffload_atexit (void)
62 /* Unlink FILE unless we are debugging. */
64 maybe_unlink (const char *file)
67 notice ("[Leaving %s]\n", file);
69 unlink_if_ordinary (file);
72 /* Add or change the value of an environment variable, outputting the
73 change to standard error if in verbose mode. */
75 xputenv (const char *string)
78 fprintf (stderr, "%s\n", string);
79 putenv (CONST_CAST (char *, string));
82 /* Parse STR, saving found tokens into PVALUES and return their number.
83 Tokens are assumed to be delimited by ':'. */
85 parse_env_var (const char *str, char ***pvalues)
87 const char *curval, *nextval;
91 curval = strchr (str, ':');
95 curval = strchr (curval + 1, ':');
98 values = (char **) xmalloc (num * sizeof (char *));
100 nextval = strchr (curval, ':');
102 nextval = strchr (curval, '\0');
104 for (i = 0; i < num; i++)
106 int l = nextval - curval;
107 values[i] = (char *) xmalloc (l + 1);
108 memcpy (values[i], curval, l);
110 curval = nextval + 1;
111 nextval = strchr (curval, ':');
113 nextval = strchr (curval, '\0');
119 /* Auxiliary function that frees elements of PTR and PTR itself.
120 N is number of elements to be freed. If PTR is NULL, nothing is freed.
121 If an element is NULL, subsequent elements are not freed. */
123 free_array_of_ptrs (void **ptr, unsigned n)
128 for (i = 0; i < n; i++)
138 /* Check whether NAME can be accessed in MODE. This is like access,
139 except that it never considers directories to be executable. */
141 access_check (const char *name, int mode)
147 if (stat (name, &st) < 0 || S_ISDIR (st.st_mode))
151 return access (name, mode);
154 /* Find target compiler using a path from COLLECT_GCC or COMPILER_PATH. */
156 find_target_compiler (const char *name)
161 char *target_compiler;
162 const char *collect_gcc = getenv ("COLLECT_GCC");
163 const char *gcc_path = dirname (ASTRDUP (collect_gcc));
164 const char *gcc_exec = basename (ASTRDUP (collect_gcc));
166 if (strcmp (gcc_exec, collect_gcc) == 0)
168 /* collect_gcc has no path, so it was found in PATH. Make sure we also
169 find accel-gcc in PATH. */
170 target_compiler = XDUPVEC (char, name, strlen (name) + 1);
175 target_compiler = concat (gcc_path, "/", name, NULL);
176 if (access_check (target_compiler, X_OK) == 0)
182 n_paths = parse_env_var (getenv ("COMPILER_PATH"), &paths);
183 for (i = 0; i < n_paths; i++)
185 size_t len = strlen (paths[i]) + 1 + strlen (name) + 1;
186 target_compiler = XRESIZEVEC (char, target_compiler, len);
187 sprintf (target_compiler, "%s/%s", paths[i], name);
188 if (access_check (target_compiler, X_OK) == 0)
196 free_array_of_ptrs ((void **) paths, n_paths);
197 return found ? target_compiler : NULL;
201 compile_for_target (struct obstack *argv_obstack)
204 obstack_ptr_grow (argv_obstack, "-m32");
206 obstack_ptr_grow (argv_obstack, "-m64");
207 obstack_ptr_grow (argv_obstack, NULL);
208 char **argv = XOBFINISH (argv_obstack, char **);
210 /* Save environment variables. */
211 const char *epath = getenv ("GCC_EXEC_PREFIX");
212 const char *cpath = getenv ("COMPILER_PATH");
213 const char *lpath = getenv ("LIBRARY_PATH");
214 const char *rpath = getenv ("LD_RUN_PATH");
215 unsetenv ("GCC_EXEC_PREFIX");
216 unsetenv ("COMPILER_PATH");
217 unsetenv ("LIBRARY_PATH");
218 unsetenv ("LD_RUN_PATH");
220 fork_execute (argv[0], argv, false);
221 obstack_free (argv_obstack, NULL);
223 /* Restore environment variables. */
224 xputenv (concat ("GCC_EXEC_PREFIX=", epath, NULL));
225 xputenv (concat ("COMPILER_PATH=", cpath, NULL));
226 xputenv (concat ("LIBRARY_PATH=", lpath, NULL));
227 xputenv (concat ("LD_RUN_PATH=", rpath, NULL));
230 /* Generates object file with the descriptor for the target library. */
232 generate_target_descr_file (const char *target_compiler)
234 const char *src_filename = make_temp_file ("_target_descr.c");
235 const char *obj_filename = make_temp_file ("_target_descr.o");
236 temp_files[num_temps++] = src_filename;
237 temp_files[num_temps++] = obj_filename;
238 FILE *src_file = fopen (src_filename, "w");
241 fatal_error (input_location, "cannot open '%s'", src_filename);
244 "extern void *__offload_funcs_end[];\n"
245 "extern void *__offload_vars_end[];\n\n"
247 "void *__offload_func_table[0]\n"
248 "__attribute__ ((__used__, visibility (\"hidden\"),\n"
249 "section (\".gnu.offload_funcs\"))) = { };\n\n"
251 "void *__offload_var_table[0]\n"
252 "__attribute__ ((__used__, visibility (\"hidden\"),\n"
253 "section (\".gnu.offload_vars\"))) = { };\n\n"
255 "void *__OFFLOAD_TARGET_TABLE__[]\n"
256 "__attribute__ ((__used__, visibility (\"hidden\"))) = {\n"
257 " &__offload_func_table, &__offload_funcs_end,\n"
258 " &__offload_var_table, &__offload_vars_end\n"
262 "#ifdef __cplusplus\n"
265 "void target_register_lib (const void *);\n\n"
267 "__attribute__((constructor))\n"
271 " target_register_lib (__OFFLOAD_TARGET_TABLE__);\n"
275 struct obstack argv_obstack;
276 obstack_init (&argv_obstack);
277 obstack_ptr_grow (&argv_obstack, target_compiler);
278 obstack_ptr_grow (&argv_obstack, "-c");
279 obstack_ptr_grow (&argv_obstack, "-shared");
280 obstack_ptr_grow (&argv_obstack, "-fPIC");
281 obstack_ptr_grow (&argv_obstack, src_filename);
282 obstack_ptr_grow (&argv_obstack, "-o");
283 obstack_ptr_grow (&argv_obstack, obj_filename);
284 compile_for_target (&argv_obstack);
289 /* Generates object file with __offload_*_end symbols for the target
292 generate_target_offloadend_file (const char *target_compiler)
294 const char *src_filename = make_temp_file ("_target_offloadend.c");
295 const char *obj_filename = make_temp_file ("_target_offloadend.o");
296 temp_files[num_temps++] = src_filename;
297 temp_files[num_temps++] = obj_filename;
298 FILE *src_file = fopen (src_filename, "w");
301 fatal_error (input_location, "cannot open '%s'", src_filename);
304 "void *__offload_funcs_end[0]\n"
305 "__attribute__ ((__used__, visibility (\"hidden\"),\n"
306 "section (\".gnu.offload_funcs\"))) = { };\n\n"
308 "void *__offload_vars_end[0]\n"
309 "__attribute__ ((__used__, visibility (\"hidden\"),\n"
310 "section (\".gnu.offload_vars\"))) = { };\n");
313 struct obstack argv_obstack;
314 obstack_init (&argv_obstack);
315 obstack_ptr_grow (&argv_obstack, target_compiler);
316 obstack_ptr_grow (&argv_obstack, "-c");
317 obstack_ptr_grow (&argv_obstack, "-shared");
318 obstack_ptr_grow (&argv_obstack, "-fPIC");
319 obstack_ptr_grow (&argv_obstack, src_filename);
320 obstack_ptr_grow (&argv_obstack, "-o");
321 obstack_ptr_grow (&argv_obstack, obj_filename);
322 compile_for_target (&argv_obstack);
327 /* Generates object file with the host side descriptor. */
329 generate_host_descr_file (const char *host_compiler)
331 const char *src_filename = make_temp_file ("_host_descr.c");
332 const char *obj_filename = make_temp_file ("_host_descr.o");
333 temp_files[num_temps++] = src_filename;
334 temp_files[num_temps++] = obj_filename;
335 FILE *src_file = fopen (src_filename, "w");
338 fatal_error (input_location, "cannot open '%s'", src_filename);
341 "extern void *__OFFLOAD_TABLE__;\n"
342 "extern void *__offload_image_intelmic_start;\n"
343 "extern void *__offload_image_intelmic_end;\n\n"
345 "static const void *__offload_target_data[] = {\n"
346 " &__offload_image_intelmic_start, &__offload_image_intelmic_end\n"
350 "#ifdef __cplusplus\n"
353 "void GOMP_offload_register (void *, int, void *);\n"
354 "#ifdef __cplusplus\n"
357 "void GOMP_offload_unregister (void *, int, void *);\n\n"
359 "__attribute__((constructor))\n"
363 " GOMP_offload_register (&__OFFLOAD_TABLE__, %d, __offload_target_data);\n"
364 "}\n\n", GOMP_DEVICE_INTEL_MIC);
367 "__attribute__((destructor))\n"
371 " GOMP_offload_unregister (&__OFFLOAD_TABLE__, %d, __offload_target_data);\n"
372 "}\n", GOMP_DEVICE_INTEL_MIC);
376 unsigned new_argc = 0;
377 const char *new_argv[9];
378 new_argv[new_argc++] = host_compiler;
379 new_argv[new_argc++] = "-c";
380 new_argv[new_argc++] = "-fPIC";
381 new_argv[new_argc++] = "-shared";
383 new_argv[new_argc++] = "-m32";
385 new_argv[new_argc++] = "-m64";
386 new_argv[new_argc++] = src_filename;
387 new_argv[new_argc++] = "-o";
388 new_argv[new_argc++] = obj_filename;
389 new_argv[new_argc++] = NULL;
391 fork_execute (new_argv[0], CONST_CAST (char **, new_argv), false);
397 prepare_target_image (const char *target_compiler, int argc, char **argv)
399 const char *target_descr_filename
400 = generate_target_descr_file (target_compiler);
401 const char *target_offloadend_filename
402 = generate_target_offloadend_file (target_compiler);
405 = XALLOCAVEC (char, sizeof ("-Wl,") + strlen (target_descr_filename));
407 = XALLOCAVEC (char, sizeof ("-Wl,") + strlen (target_offloadend_filename));
408 sprintf (opt1, "-Wl,%s", target_descr_filename);
409 sprintf (opt2, "-Wl,%s", target_offloadend_filename);
411 const char *target_so_filename = make_temp_file ("_offload_intelmic.so");
412 temp_files[num_temps++] = target_so_filename;
413 struct obstack argv_obstack;
414 obstack_init (&argv_obstack);
415 obstack_ptr_grow (&argv_obstack, target_compiler);
416 obstack_ptr_grow (&argv_obstack, "-xlto");
417 obstack_ptr_grow (&argv_obstack, "-shared");
418 obstack_ptr_grow (&argv_obstack, "-fPIC");
419 obstack_ptr_grow (&argv_obstack, opt1);
420 for (int i = 1; i < argc; i++)
422 if (!strcmp (argv[i], "-o") && i + 1 != argc)
423 out_obj_filename = argv[++i];
425 obstack_ptr_grow (&argv_obstack, argv[i]);
427 if (!out_obj_filename)
428 fatal_error (input_location, "output file not specified");
429 obstack_ptr_grow (&argv_obstack, opt2);
430 obstack_ptr_grow (&argv_obstack, "-o");
431 obstack_ptr_grow (&argv_obstack, target_so_filename);
432 compile_for_target (&argv_obstack);
435 char *rename_section_opt
436 = XALLOCAVEC (char, sizeof (".data=") + strlen (image_section_name));
437 sprintf (rename_section_opt, ".data=%s", image_section_name);
438 const char *objcopy_argv[11];
439 objcopy_argv[0] = "objcopy";
440 objcopy_argv[1] = "-B";
441 objcopy_argv[2] = "i386";
442 objcopy_argv[3] = "-I";
443 objcopy_argv[4] = "binary";
444 objcopy_argv[5] = "-O";
446 objcopy_argv[6] = "elf32-i386";
448 objcopy_argv[6] = "elf64-x86-64";
449 objcopy_argv[7] = target_so_filename;
450 objcopy_argv[8] = "--rename-section";
451 objcopy_argv[9] = rename_section_opt;
452 objcopy_argv[10] = NULL;
453 fork_execute (objcopy_argv[0], CONST_CAST (char **, objcopy_argv), false);
455 /* Objcopy has created symbols, containing the input file name with
456 non-alphanumeric characters replaced by underscores.
457 We are going to rename these new symbols. */
458 size_t symbol_name_len = strlen (target_so_filename);
459 char *symbol_name = XALLOCAVEC (char, symbol_name_len + 1);
460 for (size_t i = 0; i < symbol_name_len; i++)
462 char c = target_so_filename[i];
467 symbol_name[symbol_name_len] = '\0';
469 char *opt_for_objcopy[3];
470 opt_for_objcopy[0] = XALLOCAVEC (char, sizeof ("_binary__start=")
472 + strlen (symbols[0]));
473 opt_for_objcopy[1] = XALLOCAVEC (char, sizeof ("_binary__end=")
475 + strlen (symbols[1]));
476 opt_for_objcopy[2] = XALLOCAVEC (char, sizeof ("_binary__size=")
478 + strlen (symbols[2]));
479 sprintf (opt_for_objcopy[0], "_binary_%s_start=%s", symbol_name, symbols[0]);
480 sprintf (opt_for_objcopy[1], "_binary_%s_end=%s", symbol_name, symbols[1]);
481 sprintf (opt_for_objcopy[2], "_binary_%s_size=%s", symbol_name, symbols[2]);
483 objcopy_argv[0] = "objcopy";
484 objcopy_argv[1] = target_so_filename;
485 objcopy_argv[2] = "--redefine-sym";
486 objcopy_argv[3] = opt_for_objcopy[0];
487 objcopy_argv[4] = "--redefine-sym";
488 objcopy_argv[5] = opt_for_objcopy[1];
489 objcopy_argv[6] = "--redefine-sym";
490 objcopy_argv[7] = opt_for_objcopy[2];
491 objcopy_argv[8] = NULL;
492 fork_execute (objcopy_argv[0], CONST_CAST (char **, objcopy_argv), false);
494 return target_so_filename;
498 main (int argc, char **argv)
500 progname = "mkoffload-intelmic";
502 diagnostic_initialize (global_dc, 0);
504 if (atexit (mkoffload_atexit) != 0)
505 fatal_error (input_location, "atexit failed");
507 const char *host_compiler = getenv ("COLLECT_GCC");
509 fatal_error (input_location, "COLLECT_GCC must be set");
511 const char *target_driver_name = GCC_INSTALL_NAME;
512 char *target_compiler = find_target_compiler (target_driver_name);
513 if (target_compiler == NULL)
514 fatal_error (input_location, "offload compiler %s not found",
517 /* We may be called with all the arguments stored in some file and
518 passed with @file. Expand them into argv before processing. */
519 expandargv (&argc, &argv);
521 /* Find out whether we should compile binaries for i386 or x86-64. */
522 for (int i = argc - 1; i > 0; i--)
523 if (strncmp (argv[i], "-foffload-abi=", sizeof ("-foffload-abi=") - 1) == 0)
525 if (strstr (argv[i], "ilp32"))
527 else if (!strstr (argv[i], "lp64"))
528 fatal_error (input_location,
529 "unrecognizable argument of option -foffload-abi");
533 const char *target_so_filename
534 = prepare_target_image (target_compiler, argc, argv);
536 const char *host_descr_filename = generate_host_descr_file (host_compiler);
538 /* Perform partial linking for the target image and host side descriptor.
539 As a result we'll get a finalized object file with all offload data. */
540 unsigned new_argc = 0;
541 const char *new_argv[9];
542 new_argv[new_argc++] = "ld";
543 new_argv[new_argc++] = "-m";
545 new_argv[new_argc++] = "elf_i386";
547 new_argv[new_argc++] = "elf_x86_64";
548 new_argv[new_argc++] = "--relocatable";
549 new_argv[new_argc++] = host_descr_filename;
550 new_argv[new_argc++] = target_so_filename;
551 new_argv[new_argc++] = "-o";
552 new_argv[new_argc++] = out_obj_filename;
553 new_argv[new_argc++] = NULL;
554 fork_execute (new_argv[0], CONST_CAST (char **, new_argv), false);
556 /* Run objcopy on the resultant object file to localize generated symbols
557 to avoid conflicting between different DSO and an executable. */
558 new_argv[0] = "objcopy";
560 new_argv[2] = symbols[0];
562 new_argv[4] = symbols[1];
564 new_argv[6] = symbols[2];
565 new_argv[7] = out_obj_filename;
567 fork_execute (new_argv[0], CONST_CAST (char **, new_argv), false);