1 /* BFD support for the ARM processor
2 Copyright (C) 1994-2018 Free Software Foundation, Inc.
3 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
25 #include "libiberty.h"
27 /* This routine is provided two arch_infos and works out which ARM
28 machine which would be compatible with both and returns a pointer
29 to its info structure. */
31 static const bfd_arch_info_type *
32 compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b)
34 /* If a & b are for different architecture we can do nothing. */
35 if (a->arch != b->arch)
38 /* If a & b are for the same machine then all is well. */
39 if (a->mach == b->mach)
42 /* Otherwise if either a or b is the 'default' machine
43 then it can be polymorphed into the other. */
50 /* So far all newer ARM architecture cores are
51 supersets of previous cores. */
52 if (a->mach < b->mach)
54 else if (a->mach > b->mach)
68 { bfd_mach_arm_2, "arm2" },
69 { bfd_mach_arm_2a, "arm250" },
70 { bfd_mach_arm_2a, "arm3" },
71 { bfd_mach_arm_3, "arm6" },
72 { bfd_mach_arm_3, "arm60" },
73 { bfd_mach_arm_3, "arm600" },
74 { bfd_mach_arm_3, "arm610" },
75 { bfd_mach_arm_3, "arm7" },
76 { bfd_mach_arm_3, "arm710" },
77 { bfd_mach_arm_3, "arm7500" },
78 { bfd_mach_arm_3, "arm7d" },
79 { bfd_mach_arm_3, "arm7di" },
80 { bfd_mach_arm_3M, "arm7dm" },
81 { bfd_mach_arm_3M, "arm7dmi" },
82 { bfd_mach_arm_4T, "arm7tdmi" },
83 { bfd_mach_arm_4, "arm8" },
84 { bfd_mach_arm_4, "arm810" },
85 { bfd_mach_arm_4, "arm9" },
86 { bfd_mach_arm_4, "arm920" },
87 { bfd_mach_arm_4T, "arm920t" },
88 { bfd_mach_arm_4T, "arm9tdmi" },
89 { bfd_mach_arm_4, "sa1" },
90 { bfd_mach_arm_4, "strongarm"},
91 { bfd_mach_arm_4, "strongarm110" },
92 { bfd_mach_arm_4, "strongarm1100" },
93 { bfd_mach_arm_XScale, "xscale" },
94 { bfd_mach_arm_ep9312, "ep9312" },
95 { bfd_mach_arm_iWMMXt, "iwmmxt" },
96 { bfd_mach_arm_iWMMXt2, "iwmmxt2" },
97 { bfd_mach_arm_unknown, "arm_any" }
101 scan (const struct bfd_arch_info *info, const char *string)
105 /* First test for an exact match. */
106 if (strcasecmp (string, info->printable_name) == 0)
109 /* Next check for a processor name instead of an Architecture name. */
110 for (i = sizeof (processors) / sizeof (processors[0]); i--;)
112 if (strcasecmp (string, processors [i].name) == 0)
116 if (i != -1 && info->mach == processors [i].mach)
119 /* Finally check for the default architecture. */
120 if (strcasecmp (string, "arm") == 0)
121 return info->the_default;
126 #define N(number, print, default, next) \
127 { 32, 32, 8, bfd_arch_arm, number, "arm", print, 4, default, compatible, \
128 scan, bfd_arch_default_fill, next }
130 static const bfd_arch_info_type arch_info_struct[] =
132 N (bfd_mach_arm_2, "armv2", FALSE, & arch_info_struct[1]),
133 N (bfd_mach_arm_2a, "armv2a", FALSE, & arch_info_struct[2]),
134 N (bfd_mach_arm_3, "armv3", FALSE, & arch_info_struct[3]),
135 N (bfd_mach_arm_3M, "armv3m", FALSE, & arch_info_struct[4]),
136 N (bfd_mach_arm_4, "armv4", FALSE, & arch_info_struct[5]),
137 N (bfd_mach_arm_4T, "armv4t", FALSE, & arch_info_struct[6]),
138 N (bfd_mach_arm_5, "armv5", FALSE, & arch_info_struct[7]),
139 N (bfd_mach_arm_5T, "armv5t", FALSE, & arch_info_struct[8]),
140 N (bfd_mach_arm_5TE, "armv5te", FALSE, & arch_info_struct[9]),
141 N (bfd_mach_arm_XScale, "xscale", FALSE, & arch_info_struct[10]),
142 N (bfd_mach_arm_ep9312, "ep9312", FALSE, & arch_info_struct[11]),
143 N (bfd_mach_arm_iWMMXt, "iwmmxt", FALSE, & arch_info_struct[12]),
144 N (bfd_mach_arm_iWMMXt2, "iwmmxt2", FALSE, & arch_info_struct[13]),
145 N (bfd_mach_arm_unknown, "arm_any", FALSE, NULL)
148 const bfd_arch_info_type bfd_arm_arch =
149 N (0, "arm", TRUE, & arch_info_struct[0]);
151 /* Support functions used by both the COFF and ELF versions of the ARM port. */
153 /* Handle the merging of the 'machine' settings of input file IBFD
154 and an output file OBFD. These values actually represent the
155 different possible ARM architecture variants.
156 Returns TRUE if they were merged successfully or FALSE otherwise. */
159 bfd_arm_merge_machines (bfd *ibfd, bfd *obfd)
161 unsigned int in = bfd_get_mach (ibfd);
162 unsigned int out = bfd_get_mach (obfd);
164 /* If the output architecture is unknown, we now have a value to set. */
165 if (out == bfd_mach_arm_unknown)
166 bfd_set_arch_mach (obfd, bfd_arch_arm, in);
168 /* If the input architecture is unknown,
169 then so must be the output architecture. */
170 else if (in == bfd_mach_arm_unknown)
171 /* FIXME: We ought to have some way to
172 override this on the command line. */
173 bfd_set_arch_mach (obfd, bfd_arch_arm, bfd_mach_arm_unknown);
175 /* If they are the same then nothing needs to be done. */
179 /* Otherwise the general principle that a earlier architecture can be
180 linked with a later architecture to produce a binary that will execute
181 on the later architecture.
183 We fail however if we attempt to link a Cirrus EP9312 binary with an
184 Intel XScale binary, since these architecture have co-processors which
185 will not both be present on the same physical hardware. */
186 else if (in == bfd_mach_arm_ep9312
187 && (out == bfd_mach_arm_XScale
188 || out == bfd_mach_arm_iWMMXt
189 || out == bfd_mach_arm_iWMMXt2))
191 /* xgettext: c-format */
192 _bfd_error_handler (_("\
193 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
195 bfd_set_error (bfd_error_wrong_format);
198 else if (out == bfd_mach_arm_ep9312
199 && (in == bfd_mach_arm_XScale
200 || in == bfd_mach_arm_iWMMXt
201 || in == bfd_mach_arm_iWMMXt2))
203 /* xgettext: c-format */
204 _bfd_error_handler (_("\
205 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
207 bfd_set_error (bfd_error_wrong_format);
211 bfd_set_arch_mach (obfd, bfd_arch_arm, in);
220 unsigned char namesz[4]; /* Size of entry's owner string. */
221 unsigned char descsz[4]; /* Size of the note descriptor. */
222 unsigned char type[4]; /* Interpretation of the descriptor. */
223 char name[1]; /* Start of the name+desc data. */
227 arm_check_note (bfd *abfd,
229 bfd_size_type buffer_size,
230 const char *expected_name,
231 char **description_return)
233 unsigned long namesz;
234 unsigned long descsz;
238 if (buffer_size < offsetof (arm_Note, name))
241 /* We have to extract the values this way to allow for a
242 host whose endian-ness is different from the target. */
243 namesz = bfd_get_32 (abfd, buffer);
244 descsz = bfd_get_32 (abfd, buffer + offsetof (arm_Note, descsz));
245 type = bfd_get_32 (abfd, buffer + offsetof (arm_Note, type));
246 descr = (char *) buffer + offsetof (arm_Note, name);
248 /* Check for buffer overflow. */
249 if (namesz + descsz + offsetof (arm_Note, name) > buffer_size)
252 if (expected_name == NULL)
259 if (namesz != ((strlen (expected_name) + 1 + 3) & ~3))
262 if (strcmp (descr, expected_name) != 0)
265 descr += (namesz + 3) & ~3;
268 /* FIXME: We should probably check the type as well. */
271 if (description_return != NULL)
272 * description_return = descr;
277 #define NOTE_ARCH_STRING "arch: "
280 bfd_arm_update_notes (bfd *abfd, const char *note_section)
282 asection * arm_arch_section;
283 bfd_size_type buffer_size;
288 /* Look for a note section. If one is present check the architecture
289 string encoded in it, and set it to the current architecture if it is
291 arm_arch_section = bfd_get_section_by_name (abfd, note_section);
293 if (arm_arch_section == NULL)
296 buffer_size = arm_arch_section->size;
297 if (buffer_size == 0)
300 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
303 /* Parse the note. */
304 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
307 /* Check the architecture in the note against the architecture of the bfd. */
308 switch (bfd_get_mach (abfd))
311 case bfd_mach_arm_unknown: expected = "unknown"; break;
312 case bfd_mach_arm_2: expected = "armv2"; break;
313 case bfd_mach_arm_2a: expected = "armv2a"; break;
314 case bfd_mach_arm_3: expected = "armv3"; break;
315 case bfd_mach_arm_3M: expected = "armv3M"; break;
316 case bfd_mach_arm_4: expected = "armv4"; break;
317 case bfd_mach_arm_4T: expected = "armv4t"; break;
318 case bfd_mach_arm_5: expected = "armv5"; break;
319 case bfd_mach_arm_5T: expected = "armv5t"; break;
320 case bfd_mach_arm_5TE: expected = "armv5te"; break;
321 case bfd_mach_arm_XScale: expected = "XScale"; break;
322 case bfd_mach_arm_ep9312: expected = "ep9312"; break;
323 case bfd_mach_arm_iWMMXt: expected = "iWMMXt"; break;
324 case bfd_mach_arm_iWMMXt2: expected = "iWMMXt2"; break;
327 if (strcmp (arch_string, expected) != 0)
329 strcpy ((char *) buffer + (offsetof (arm_Note, name)
330 + ((strlen (NOTE_ARCH_STRING) + 3) & ~3)),
333 if (! bfd_set_section_contents (abfd, arm_arch_section, buffer,
334 (file_ptr) 0, buffer_size))
337 /* xgettext: c-format */
338 (_("warning: unable to update contents of %s section in %B"),
361 { "armv2", bfd_mach_arm_2 },
362 { "armv2a", bfd_mach_arm_2a },
363 { "armv3", bfd_mach_arm_3 },
364 { "armv3M", bfd_mach_arm_3M },
365 { "armv4", bfd_mach_arm_4 },
366 { "armv4t", bfd_mach_arm_4T },
367 { "armv5", bfd_mach_arm_5 },
368 { "armv5t", bfd_mach_arm_5T },
369 { "armv5te", bfd_mach_arm_5TE },
370 { "XScale", bfd_mach_arm_XScale },
371 { "ep9312", bfd_mach_arm_ep9312 },
372 { "iWMMXt", bfd_mach_arm_iWMMXt },
373 { "iWMMXt2", bfd_mach_arm_iWMMXt2 },
374 { "arm_any", bfd_mach_arm_unknown }
377 /* Extract the machine number stored in a note section. */
379 bfd_arm_get_mach_from_notes (bfd *abfd, const char *note_section)
381 asection * arm_arch_section;
382 bfd_size_type buffer_size;
387 /* Look for a note section. If one is present check the architecture
388 string encoded in it, and set it to the current architecture if it is
390 arm_arch_section = bfd_get_section_by_name (abfd, note_section);
392 if (arm_arch_section == NULL)
393 return bfd_mach_arm_unknown;
395 buffer_size = arm_arch_section->size;
396 if (buffer_size == 0)
397 return bfd_mach_arm_unknown;
399 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
402 /* Parse the note. */
403 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
406 /* Interpret the architecture string. */
407 for (i = ARRAY_SIZE (architectures); i--;)
408 if (strcmp (arch_string, architectures[i].string) == 0)
411 return architectures[i].mach;
417 return bfd_mach_arm_unknown;
421 bfd_is_arm_special_symbol_name (const char * name, int type)
423 /* The ARM compiler outputs several obsolete forms. Recognize them
424 in addition to the standard $a, $t and $d. We are somewhat loose
425 in what we accept here, since the full set is not documented. */
426 if (!name || name[0] != '$')
428 if (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
429 type &= BFD_ARM_SPECIAL_SYM_TYPE_MAP;
430 else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
431 type &= BFD_ARM_SPECIAL_SYM_TYPE_TAG;
432 else if (name[1] >= 'a' && name[1] <= 'z')
433 type &= BFD_ARM_SPECIAL_SYM_TYPE_OTHER;
437 return (type != 0 && (name[2] == 0 || name[2] == '.'));