1 /* BFD support for the ARM processor
2 Copyright 1994, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007,
3 2009, 2010 Free Software Foundation, Inc.
4 Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
26 #include "libiberty.h"
28 /* This routine is provided two arch_infos and works out which ARM
29 machine which would be compatible with both and returns a pointer
30 to its info structure. */
32 static const bfd_arch_info_type *
33 compatible (const bfd_arch_info_type *a, const bfd_arch_info_type *b)
35 /* If a & b are for different architecture we can do nothing. */
36 if (a->arch != b->arch)
39 /* If a & b are for the same machine then all is well. */
40 if (a->mach == b->mach)
43 /* Otherwise if either a or b is the 'default' machine
44 then it can be polymorphed into the other. */
51 /* So far all newer ARM architecture cores are
52 supersets of previous cores. */
53 if (a->mach < b->mach)
55 else if (a->mach > b->mach)
69 { bfd_mach_arm_2, "arm2" },
70 { bfd_mach_arm_2a, "arm250" },
71 { bfd_mach_arm_2a, "arm3" },
72 { bfd_mach_arm_3, "arm6" },
73 { bfd_mach_arm_3, "arm60" },
74 { bfd_mach_arm_3, "arm600" },
75 { bfd_mach_arm_3, "arm610" },
76 { bfd_mach_arm_3, "arm7" },
77 { bfd_mach_arm_3, "arm710" },
78 { bfd_mach_arm_3, "arm7500" },
79 { bfd_mach_arm_3, "arm7d" },
80 { bfd_mach_arm_3, "arm7di" },
81 { bfd_mach_arm_3M, "arm7dm" },
82 { bfd_mach_arm_3M, "arm7dmi" },
83 { bfd_mach_arm_4T, "arm7tdmi" },
84 { bfd_mach_arm_4, "arm8" },
85 { bfd_mach_arm_4, "arm810" },
86 { bfd_mach_arm_4, "arm9" },
87 { bfd_mach_arm_4, "arm920" },
88 { bfd_mach_arm_4T, "arm920t" },
89 { bfd_mach_arm_4T, "arm9tdmi" },
90 { bfd_mach_arm_4, "sa1" },
91 { bfd_mach_arm_4, "strongarm"},
92 { bfd_mach_arm_4, "strongarm110" },
93 { bfd_mach_arm_4, "strongarm1100" },
94 { bfd_mach_arm_XScale, "xscale" },
95 { bfd_mach_arm_ep9312, "ep9312" },
96 { bfd_mach_arm_iWMMXt, "iwmmxt" },
97 { bfd_mach_arm_iWMMXt2, "iwmmxt2" }
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, NULL)
147 const bfd_arch_info_type bfd_arm_arch =
148 N (0, "arm", TRUE, & arch_info_struct[0]);
150 /* Support functions used by both the COFF and ELF versions of the ARM port. */
152 /* Handle the merging of the 'machine' settings of input file IBFD
153 and an output file OBFD. These values actually represent the
154 different possible ARM architecture variants.
155 Returns TRUE if they were merged successfully or FALSE otherwise. */
158 bfd_arm_merge_machines (bfd *ibfd, bfd *obfd)
160 unsigned int in = bfd_get_mach (ibfd);
161 unsigned int out = bfd_get_mach (obfd);
163 /* If the output architecture is unknown, we now have a value to set. */
164 if (out == bfd_mach_arm_unknown)
165 bfd_set_arch_mach (obfd, bfd_arch_arm, in);
167 /* If the input architecture is unknown,
168 then so must be the output architecture. */
169 else if (in == bfd_mach_arm_unknown)
170 /* FIXME: We ought to have some way to
171 override this on the command line. */
172 bfd_set_arch_mach (obfd, bfd_arch_arm, bfd_mach_arm_unknown);
174 /* If they are the same then nothing needs to be done. */
178 /* Otherwise the general principle that a earlier architecture can be
179 linked with a later architecture to produce a binary that will execute
180 on the later architecture.
182 We fail however if we attempt to link a Cirrus EP9312 binary with an
183 Intel XScale binary, since these architecture have co-processors which
184 will not both be present on the same physical hardware. */
185 else if (in == bfd_mach_arm_ep9312
186 && (out == bfd_mach_arm_XScale
187 || out == bfd_mach_arm_iWMMXt
188 || out == bfd_mach_arm_iWMMXt2))
190 _bfd_error_handler (_("\
191 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
193 bfd_set_error (bfd_error_wrong_format);
196 else if (out == bfd_mach_arm_ep9312
197 && (in == bfd_mach_arm_XScale
198 || in == bfd_mach_arm_iWMMXt
199 || in == bfd_mach_arm_iWMMXt2))
201 _bfd_error_handler (_("\
202 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
204 bfd_set_error (bfd_error_wrong_format);
208 bfd_set_arch_mach (obfd, bfd_arch_arm, in);
217 unsigned char namesz[4]; /* Size of entry's owner string. */
218 unsigned char descsz[4]; /* Size of the note descriptor. */
219 unsigned char type[4]; /* Interpretation of the descriptor. */
220 char name[1]; /* Start of the name+desc data. */
224 arm_check_note (bfd *abfd,
226 bfd_size_type buffer_size,
227 const char *expected_name,
228 char **description_return)
230 unsigned long namesz;
231 unsigned long descsz;
235 if (buffer_size < offsetof (arm_Note, name))
238 /* We have to extract the values this way to allow for a
239 host whose endian-ness is different from the target. */
240 namesz = bfd_get_32 (abfd, buffer);
241 descsz = bfd_get_32 (abfd, buffer + offsetof (arm_Note, descsz));
242 type = bfd_get_32 (abfd, buffer + offsetof (arm_Note, type));
243 descr = (char *) buffer + offsetof (arm_Note, name);
245 /* Check for buffer overflow. */
246 if (namesz + descsz + offsetof (arm_Note, name) > buffer_size)
249 if (expected_name == NULL)
256 if (namesz != ((strlen (expected_name) + 1 + 3) & ~3))
259 if (strcmp (descr, expected_name) != 0)
262 descr += (namesz + 3) & ~3;
265 /* FIXME: We should probably check the type as well. */
268 if (description_return != NULL)
269 * description_return = descr;
274 #define NOTE_ARCH_STRING "arch: "
277 bfd_arm_update_notes (bfd *abfd, const char *note_section)
279 asection * arm_arch_section;
280 bfd_size_type buffer_size;
285 /* Look for a note section. If one is present check the architecture
286 string encoded in it, and set it to the current architecture if it is
288 arm_arch_section = bfd_get_section_by_name (abfd, note_section);
290 if (arm_arch_section == NULL)
293 buffer_size = arm_arch_section->size;
294 if (buffer_size == 0)
297 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
300 /* Parse the note. */
301 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
304 /* Check the architecture in the note against the architecture of the bfd. */
305 switch (bfd_get_mach (abfd))
308 case bfd_mach_arm_unknown: expected = "unknown"; break;
309 case bfd_mach_arm_2: expected = "armv2"; break;
310 case bfd_mach_arm_2a: expected = "armv2a"; break;
311 case bfd_mach_arm_3: expected = "armv3"; break;
312 case bfd_mach_arm_3M: expected = "armv3M"; break;
313 case bfd_mach_arm_4: expected = "armv4"; break;
314 case bfd_mach_arm_4T: expected = "armv4t"; break;
315 case bfd_mach_arm_5: expected = "armv5"; break;
316 case bfd_mach_arm_5T: expected = "armv5t"; break;
317 case bfd_mach_arm_5TE: expected = "armv5te"; break;
318 case bfd_mach_arm_XScale: expected = "XScale"; break;
319 case bfd_mach_arm_ep9312: expected = "ep9312"; break;
320 case bfd_mach_arm_iWMMXt: expected = "iWMMXt"; break;
321 case bfd_mach_arm_iWMMXt2: expected = "iWMMXt2"; break;
324 if (strcmp (arch_string, expected) != 0)
326 strcpy ((char *) buffer + (offsetof (arm_Note, name)
327 + ((strlen (NOTE_ARCH_STRING) + 3) & ~3)),
330 if (! bfd_set_section_contents (abfd, arm_arch_section, buffer,
331 (file_ptr) 0, buffer_size))
333 (*_bfd_error_handler)
334 (_("warning: unable to update contents of %s section in %s"),
335 note_section, bfd_get_filename (abfd));
357 { "armv2", bfd_mach_arm_2 },
358 { "armv2a", bfd_mach_arm_2a },
359 { "armv3", bfd_mach_arm_3 },
360 { "armv3M", bfd_mach_arm_3M },
361 { "armv4", bfd_mach_arm_4 },
362 { "armv4t", bfd_mach_arm_4T },
363 { "armv5", bfd_mach_arm_5 },
364 { "armv5t", bfd_mach_arm_5T },
365 { "armv5te", bfd_mach_arm_5TE },
366 { "XScale", bfd_mach_arm_XScale },
367 { "ep9312", bfd_mach_arm_ep9312 },
368 { "iWMMXt", bfd_mach_arm_iWMMXt },
369 { "iWMMXt2", bfd_mach_arm_iWMMXt2 }
372 /* Extract the machine number stored in a note section. */
374 bfd_arm_get_mach_from_notes (bfd *abfd, const char *note_section)
376 asection * arm_arch_section;
377 bfd_size_type buffer_size;
382 /* Look for a note section. If one is present check the architecture
383 string encoded in it, and set it to the current architecture if it is
385 arm_arch_section = bfd_get_section_by_name (abfd, note_section);
387 if (arm_arch_section == NULL)
388 return bfd_mach_arm_unknown;
390 buffer_size = arm_arch_section->size;
391 if (buffer_size == 0)
392 return bfd_mach_arm_unknown;
394 if (!bfd_malloc_and_get_section (abfd, arm_arch_section, &buffer))
397 /* Parse the note. */
398 if (! arm_check_note (abfd, buffer, buffer_size, NOTE_ARCH_STRING, & arch_string))
401 /* Interpret the architecture string. */
402 for (i = ARRAY_SIZE (architectures); i--;)
403 if (strcmp (arch_string, architectures[i].string) == 0)
406 return architectures[i].mach;
412 return bfd_mach_arm_unknown;
416 bfd_is_arm_special_symbol_name (const char * name, int type)
418 /* The ARM compiler outputs several obsolete forms. Recognize them
419 in addition to the standard $a, $t and $d. We are somewhat loose
420 in what we accept here, since the full set is not documented. */
421 if (!name || name[0] != '$')
423 if (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
424 type &= BFD_ARM_SPECIAL_SYM_TYPE_MAP;
425 else if (name[1] == 'm' || name[1] == 'f' || name[1] == 'p')
426 type &= BFD_ARM_SPECIAL_SYM_TYPE_TAG;
427 else if (name[1] >= 'a' && name[1] <= 'z')
428 type &= BFD_ARM_SPECIAL_SYM_TYPE_OTHER;
432 return (type != 0 && (name[2] == 0 || name[2] == '.'));