1 /* BFD support for the ARM processor
2 Copyright (C) 1994-2016 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 _bfd_error_handler (_("\
192 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
194 bfd_set_error (bfd_error_wrong_format
);
197 else if (out
== bfd_mach_arm_ep9312
198 && (in
== bfd_mach_arm_XScale
199 || in
== bfd_mach_arm_iWMMXt
200 || in
== bfd_mach_arm_iWMMXt2
))
202 _bfd_error_handler (_("\
203 error: %B is compiled for the EP9312, whereas %B is compiled for XScale"),
205 bfd_set_error (bfd_error_wrong_format
);
209 bfd_set_arch_mach (obfd
, bfd_arch_arm
, in
);
218 unsigned char namesz
[4]; /* Size of entry's owner string. */
219 unsigned char descsz
[4]; /* Size of the note descriptor. */
220 unsigned char type
[4]; /* Interpretation of the descriptor. */
221 char name
[1]; /* Start of the name+desc data. */
225 arm_check_note (bfd
*abfd
,
227 bfd_size_type buffer_size
,
228 const char *expected_name
,
229 char **description_return
)
231 unsigned long namesz
;
232 unsigned long descsz
;
236 if (buffer_size
< offsetof (arm_Note
, name
))
239 /* We have to extract the values this way to allow for a
240 host whose endian-ness is different from the target. */
241 namesz
= bfd_get_32 (abfd
, buffer
);
242 descsz
= bfd_get_32 (abfd
, buffer
+ offsetof (arm_Note
, descsz
));
243 type
= bfd_get_32 (abfd
, buffer
+ offsetof (arm_Note
, type
));
244 descr
= (char *) buffer
+ offsetof (arm_Note
, name
);
246 /* Check for buffer overflow. */
247 if (namesz
+ descsz
+ offsetof (arm_Note
, name
) > buffer_size
)
250 if (expected_name
== NULL
)
257 if (namesz
!= ((strlen (expected_name
) + 1 + 3) & ~3))
260 if (strcmp (descr
, expected_name
) != 0)
263 descr
+= (namesz
+ 3) & ~3;
266 /* FIXME: We should probably check the type as well. */
269 if (description_return
!= NULL
)
270 * description_return
= descr
;
275 #define NOTE_ARCH_STRING "arch: "
278 bfd_arm_update_notes (bfd
*abfd
, const char *note_section
)
280 asection
* arm_arch_section
;
281 bfd_size_type buffer_size
;
286 /* Look for a note section. If one is present check the architecture
287 string encoded in it, and set it to the current architecture if it is
289 arm_arch_section
= bfd_get_section_by_name (abfd
, note_section
);
291 if (arm_arch_section
== NULL
)
294 buffer_size
= arm_arch_section
->size
;
295 if (buffer_size
== 0)
298 if (!bfd_malloc_and_get_section (abfd
, arm_arch_section
, &buffer
))
301 /* Parse the note. */
302 if (! arm_check_note (abfd
, buffer
, buffer_size
, NOTE_ARCH_STRING
, & arch_string
))
305 /* Check the architecture in the note against the architecture of the bfd. */
306 switch (bfd_get_mach (abfd
))
309 case bfd_mach_arm_unknown
: expected
= "unknown"; break;
310 case bfd_mach_arm_2
: expected
= "armv2"; break;
311 case bfd_mach_arm_2a
: expected
= "armv2a"; break;
312 case bfd_mach_arm_3
: expected
= "armv3"; break;
313 case bfd_mach_arm_3M
: expected
= "armv3M"; break;
314 case bfd_mach_arm_4
: expected
= "armv4"; break;
315 case bfd_mach_arm_4T
: expected
= "armv4t"; break;
316 case bfd_mach_arm_5
: expected
= "armv5"; break;
317 case bfd_mach_arm_5T
: expected
= "armv5t"; break;
318 case bfd_mach_arm_5TE
: expected
= "armv5te"; break;
319 case bfd_mach_arm_XScale
: expected
= "XScale"; break;
320 case bfd_mach_arm_ep9312
: expected
= "ep9312"; break;
321 case bfd_mach_arm_iWMMXt
: expected
= "iWMMXt"; break;
322 case bfd_mach_arm_iWMMXt2
: expected
= "iWMMXt2"; break;
325 if (strcmp (arch_string
, expected
) != 0)
327 strcpy ((char *) buffer
+ (offsetof (arm_Note
, name
)
328 + ((strlen (NOTE_ARCH_STRING
) + 3) & ~3)),
331 if (! bfd_set_section_contents (abfd
, arm_arch_section
, buffer
,
332 (file_ptr
) 0, buffer_size
))
335 (_("warning: unable to update contents of %s section in %s"),
336 note_section
, bfd_get_filename (abfd
));
358 { "armv2", bfd_mach_arm_2
},
359 { "armv2a", bfd_mach_arm_2a
},
360 { "armv3", bfd_mach_arm_3
},
361 { "armv3M", bfd_mach_arm_3M
},
362 { "armv4", bfd_mach_arm_4
},
363 { "armv4t", bfd_mach_arm_4T
},
364 { "armv5", bfd_mach_arm_5
},
365 { "armv5t", bfd_mach_arm_5T
},
366 { "armv5te", bfd_mach_arm_5TE
},
367 { "XScale", bfd_mach_arm_XScale
},
368 { "ep9312", bfd_mach_arm_ep9312
},
369 { "iWMMXt", bfd_mach_arm_iWMMXt
},
370 { "iWMMXt2", bfd_mach_arm_iWMMXt2
},
371 { "arm_any", bfd_mach_arm_unknown
}
374 /* Extract the machine number stored in a note section. */
376 bfd_arm_get_mach_from_notes (bfd
*abfd
, const char *note_section
)
378 asection
* arm_arch_section
;
379 bfd_size_type buffer_size
;
384 /* Look for a note section. If one is present check the architecture
385 string encoded in it, and set it to the current architecture if it is
387 arm_arch_section
= bfd_get_section_by_name (abfd
, note_section
);
389 if (arm_arch_section
== NULL
)
390 return bfd_mach_arm_unknown
;
392 buffer_size
= arm_arch_section
->size
;
393 if (buffer_size
== 0)
394 return bfd_mach_arm_unknown
;
396 if (!bfd_malloc_and_get_section (abfd
, arm_arch_section
, &buffer
))
399 /* Parse the note. */
400 if (! arm_check_note (abfd
, buffer
, buffer_size
, NOTE_ARCH_STRING
, & arch_string
))
403 /* Interpret the architecture string. */
404 for (i
= ARRAY_SIZE (architectures
); i
--;)
405 if (strcmp (arch_string
, architectures
[i
].string
) == 0)
408 return architectures
[i
].mach
;
414 return bfd_mach_arm_unknown
;
418 bfd_is_arm_special_symbol_name (const char * name
, int type
)
420 /* The ARM compiler outputs several obsolete forms. Recognize them
421 in addition to the standard $a, $t and $d. We are somewhat loose
422 in what we accept here, since the full set is not documented. */
423 if (!name
|| name
[0] != '$')
425 if (name
[1] == 'a' || name
[1] == 't' || name
[1] == 'd')
426 type
&= BFD_ARM_SPECIAL_SYM_TYPE_MAP
;
427 else if (name
[1] == 'm' || name
[1] == 'f' || name
[1] == 'p')
428 type
&= BFD_ARM_SPECIAL_SYM_TYPE_TAG
;
429 else if (name
[1] >= 'a' && name
[1] <= 'z')
430 type
&= BFD_ARM_SPECIAL_SYM_TYPE_OTHER
;
434 return (type
!= 0 && (name
[2] == 0 || name
[2] == '.'));