Commit | Line | Data |
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252b5132 | 1 | /* BFD support for the ns32k architecture. |
eea6121a | 2 | Copyright 1990, 1991, 1994, 1995, 1998, 2000, 2001, 2002, 2003, 2004 |
7898deda | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | Almost totally rewritten by Ian Dall from initial work |
5 | by Andrew Cagney. | |
6 | ||
4eb6b71c | 7 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 8 | |
4eb6b71c NC |
9 | This program 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 2 of the License, or | |
12 | (at your option) any later version. | |
252b5132 | 13 | |
4eb6b71c NC |
14 | This program 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. | |
252b5132 | 18 | |
4eb6b71c NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
252b5132 RH |
22 | |
23 | #include "bfd.h" | |
24 | #include "sysdep.h" | |
25 | #include "libbfd.h" | |
26 | #include "ns32k.h" | |
27 | ||
28 | #define N(machine, printable, d, next) \ | |
29 | { 32, 32, 8, bfd_arch_ns32k, machine, "ns32k",printable,3,d,bfd_default_compatible,bfd_default_scan, next, } | |
30 | ||
31 | static const bfd_arch_info_type arch_info_struct[] = | |
71f6b586 | 32 | { |
b34976b6 | 33 | N(32532,"ns32k:32532",TRUE, 0), /* The word ns32k will match this too. */ |
252b5132 RH |
34 | }; |
35 | ||
36 | const bfd_arch_info_type bfd_ns32k_arch = | |
b34976b6 | 37 | N(32032,"ns32k:32032",FALSE, &arch_info_struct[0]); |
252b5132 | 38 | |
dc810e39 | 39 | static bfd_reloc_status_type do_ns32k_reloc |
fc0a2244 | 40 | PARAMS ((bfd *, arelent *, struct bfd_symbol *, PTR, asection *, |
dc810e39 AM |
41 | bfd *, char **, |
42 | bfd_vma (*) (bfd_byte *, int), | |
4eb6b71c | 43 | void (*) (bfd_vma, bfd_byte *, int))); |
252b5132 | 44 | |
dc810e39 AM |
45 | bfd_vma |
46 | _bfd_ns32k_get_displacement (buffer, size) | |
252b5132 | 47 | bfd_byte *buffer; |
dc810e39 | 48 | int size; |
252b5132 | 49 | { |
dc810e39 | 50 | bfd_signed_vma value; |
4eb6b71c | 51 | |
252b5132 RH |
52 | switch (size) |
53 | { | |
54 | case 1: | |
dc810e39 | 55 | value = ((*buffer & 0x7f) ^ 0x40) - 0x40; |
252b5132 | 56 | break; |
dc810e39 | 57 | |
252b5132 | 58 | case 2: |
dc810e39 | 59 | value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20; |
252b5132 RH |
60 | value = (value << 8) | (0xff & *buffer); |
61 | break; | |
dc810e39 | 62 | |
252b5132 | 63 | case 4: |
dc810e39 | 64 | value = ((*buffer++ & 0x3f) ^ 0x20) - 0x20; |
252b5132 RH |
65 | value = (value << 8) | (0xff & *buffer++); |
66 | value = (value << 8) | (0xff & *buffer++); | |
67 | value = (value << 8) | (0xff & *buffer); | |
68 | break; | |
dc810e39 | 69 | |
252b5132 RH |
70 | default: |
71 | abort (); | |
72 | return 0; | |
73 | } | |
4eb6b71c | 74 | |
252b5132 RH |
75 | return value; |
76 | } | |
77 | ||
4eb6b71c | 78 | void |
dc810e39 AM |
79 | _bfd_ns32k_put_displacement (value, buffer, size) |
80 | bfd_vma value; | |
252b5132 | 81 | bfd_byte *buffer; |
dc810e39 | 82 | int size; |
252b5132 | 83 | { |
252b5132 RH |
84 | switch (size) |
85 | { | |
86 | case 1: | |
dc810e39 AM |
87 | value &= 0x7f; |
88 | *buffer++ = value; | |
252b5132 | 89 | break; |
dc810e39 | 90 | |
252b5132 | 91 | case 2: |
dc810e39 AM |
92 | value &= 0x3fff; |
93 | value |= 0x8000; | |
94 | *buffer++ = (value >> 8); | |
95 | *buffer++ = value; | |
252b5132 | 96 | break; |
dc810e39 | 97 | |
252b5132 | 98 | case 4: |
dc810e39 AM |
99 | value |= (bfd_vma) 0xc0000000; |
100 | *buffer++ = (value >> 24); | |
101 | *buffer++ = (value >> 16); | |
102 | *buffer++ = (value >> 8); | |
103 | *buffer++ = value; | |
252b5132 | 104 | break; |
252b5132 | 105 | } |
4eb6b71c | 106 | return; |
252b5132 RH |
107 | } |
108 | ||
dc810e39 AM |
109 | bfd_vma |
110 | _bfd_ns32k_get_immediate (buffer, size) | |
252b5132 | 111 | bfd_byte *buffer; |
dc810e39 | 112 | int size; |
252b5132 | 113 | { |
dc810e39 | 114 | bfd_vma value = 0; |
4eb6b71c | 115 | |
252b5132 RH |
116 | switch (size) |
117 | { | |
118 | case 4: | |
119 | value = (value << 8) | (*buffer++ & 0xff); | |
252b5132 RH |
120 | value = (value << 8) | (*buffer++ & 0xff); |
121 | case 2: | |
122 | value = (value << 8) | (*buffer++ & 0xff); | |
123 | case 1: | |
124 | value = (value << 8) | (*buffer++ & 0xff); | |
4eb6b71c NC |
125 | break; |
126 | default: | |
127 | abort (); | |
252b5132 RH |
128 | } |
129 | return value; | |
130 | } | |
131 | ||
4eb6b71c | 132 | void |
dc810e39 AM |
133 | _bfd_ns32k_put_immediate (value, buffer, size) |
134 | bfd_vma value; | |
252b5132 | 135 | bfd_byte *buffer; |
dc810e39 | 136 | int size; |
252b5132 | 137 | { |
dc810e39 | 138 | buffer += size - 1; |
252b5132 RH |
139 | switch (size) |
140 | { | |
141 | case 4: | |
142 | *buffer-- = (value & 0xff); value >>= 8; | |
252b5132 RH |
143 | *buffer-- = (value & 0xff); value >>= 8; |
144 | case 2: | |
145 | *buffer-- = (value & 0xff); value >>= 8; | |
146 | case 1: | |
147 | *buffer-- = (value & 0xff); value >>= 8; | |
148 | } | |
252b5132 RH |
149 | } |
150 | ||
151 | /* This is just like the standard perform_relocation except we | |
4eb6b71c NC |
152 | use get_data and put_data which know about the ns32k storage |
153 | methods. This is probably a lot more complicated than it | |
154 | needs to be! */ | |
155 | ||
252b5132 RH |
156 | static bfd_reloc_status_type |
157 | do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, | |
158 | error_message, get_data, put_data) | |
159 | bfd *abfd; | |
160 | arelent *reloc_entry; | |
fc0a2244 | 161 | struct bfd_symbol *symbol; |
252b5132 RH |
162 | PTR data; |
163 | asection *input_section; | |
164 | bfd *output_bfd; | |
5f771d47 | 165 | char **error_message ATTRIBUTE_UNUSED; |
dc810e39 | 166 | bfd_vma (*get_data) PARAMS ((bfd_byte *, int)); |
4eb6b71c | 167 | void (*put_data) PARAMS ((bfd_vma, bfd_byte *, int)); |
252b5132 RH |
168 | { |
169 | int overflow = 0; | |
170 | bfd_vma relocation; | |
171 | bfd_reloc_status_type flag = bfd_reloc_ok; | |
172 | bfd_size_type addr = reloc_entry->address; | |
eea6121a | 173 | bfd_size_type sz; |
252b5132 RH |
174 | bfd_vma output_base = 0; |
175 | reloc_howto_type *howto = reloc_entry->howto; | |
176 | asection *reloc_target_output_section; | |
dc810e39 | 177 | bfd_byte *location; |
252b5132 RH |
178 | |
179 | if ((symbol->section == &bfd_abs_section) | |
180 | && output_bfd != (bfd *) NULL) | |
181 | { | |
182 | reloc_entry->address += input_section->output_offset; | |
183 | return bfd_reloc_ok; | |
184 | } | |
185 | ||
1049f94e | 186 | /* If we are not producing relocatable output, return an error if |
252b5132 RH |
187 | the symbol is not defined. An undefined weak symbol is |
188 | considered to have a value of zero (SVR4 ABI, p. 4-27). */ | |
189 | if (symbol->section == &bfd_und_section | |
190 | && (symbol->flags & BSF_WEAK) == 0 | |
191 | && output_bfd == (bfd *) NULL) | |
192 | flag = bfd_reloc_undefined; | |
193 | ||
252b5132 | 194 | /* Is the address of the relocation really within the section? */ |
eea6121a AM |
195 | sz = input_section->rawsize ? input_section->rawsize : input_section->size; |
196 | if (reloc_entry->address > sz) | |
252b5132 RH |
197 | return bfd_reloc_outofrange; |
198 | ||
5c4491d3 | 199 | /* Work out which section the relocation is targeted at and the |
252b5132 RH |
200 | initial relocation command value. */ |
201 | ||
202 | /* Get symbol value. (Common symbols are special.) */ | |
203 | if (bfd_is_com_section (symbol->section)) | |
204 | relocation = 0; | |
205 | else | |
206 | relocation = symbol->value; | |
207 | ||
252b5132 RH |
208 | reloc_target_output_section = symbol->section->output_section; |
209 | ||
210 | /* Convert input-section-relative symbol value to absolute. */ | |
82e51918 | 211 | if (output_bfd != NULL && ! howto->partial_inplace) |
252b5132 RH |
212 | output_base = 0; |
213 | else | |
214 | output_base = reloc_target_output_section->vma; | |
215 | ||
216 | relocation += output_base + symbol->section->output_offset; | |
217 | ||
218 | /* Add in supplied addend. */ | |
219 | relocation += reloc_entry->addend; | |
220 | ||
221 | /* Here the variable relocation holds the final address of the | |
222 | symbol we are relocating against, plus any addend. */ | |
223 | ||
82e51918 | 224 | if (howto->pc_relative) |
252b5132 RH |
225 | { |
226 | /* This is a PC relative relocation. We want to set RELOCATION | |
227 | to the distance between the address of the symbol and the | |
228 | location. RELOCATION is already the address of the symbol. | |
229 | ||
230 | We start by subtracting the address of the section containing | |
231 | the location. | |
232 | ||
233 | If pcrel_offset is set, we must further subtract the position | |
234 | of the location within the section. Some targets arrange for | |
235 | the addend to be the negative of the position of the location | |
236 | within the section; for example, i386-aout does this. For | |
b34976b6 | 237 | i386-aout, pcrel_offset is FALSE. Some other targets do not |
252b5132 | 238 | include the position of the location; for example, m88kbcs, |
b34976b6 | 239 | or ELF. For those targets, pcrel_offset is TRUE. |
252b5132 | 240 | |
1049f94e | 241 | If we are producing relocatable output, then we must ensure |
252b5132 | 242 | that this reloc will be correctly computed when the final |
b34976b6 | 243 | relocation is done. If pcrel_offset is FALSE we want to wind |
252b5132 RH |
244 | up with the negative of the location within the section, |
245 | which means we must adjust the existing addend by the change | |
b34976b6 | 246 | in the location within the section. If pcrel_offset is TRUE |
252b5132 RH |
247 | we do not want to adjust the existing addend at all. |
248 | ||
249 | FIXME: This seems logical to me, but for the case of | |
1049f94e | 250 | producing relocatable output it is not what the code |
252b5132 RH |
251 | actually does. I don't want to change it, because it seems |
252 | far too likely that something will break. */ | |
252b5132 RH |
253 | relocation -= |
254 | input_section->output_section->vma + input_section->output_offset; | |
255 | ||
82e51918 | 256 | if (howto->pcrel_offset) |
252b5132 RH |
257 | relocation -= reloc_entry->address; |
258 | } | |
259 | ||
260 | if (output_bfd != (bfd *) NULL) | |
261 | { | |
82e51918 | 262 | if (! howto->partial_inplace) |
252b5132 RH |
263 | { |
264 | /* This is a partial relocation, and we want to apply the relocation | |
265 | to the reloc entry rather than the raw data. Modify the reloc | |
266 | inplace to reflect what we now know. */ | |
267 | reloc_entry->addend = relocation; | |
268 | reloc_entry->address += input_section->output_offset; | |
269 | return flag; | |
270 | } | |
271 | else | |
272 | { | |
273 | /* This is a partial relocation, but inplace, so modify the | |
274 | reloc record a bit. | |
275 | ||
276 | If we've relocated with a symbol with a section, change | |
277 | into a ref to the section belonging to the symbol. */ | |
278 | ||
279 | reloc_entry->address += input_section->output_offset; | |
280 | ||
281 | /* WTF?? */ | |
9bd09e22 | 282 | if (abfd->xvec->flavour == bfd_target_coff_flavour) |
252b5132 RH |
283 | { |
284 | #if 1 | |
285 | /* For m68k-coff, the addend was being subtracted twice during | |
286 | relocation with -r. Removing the line below this comment | |
287 | fixes that problem; see PR 2953. | |
288 | ||
4eb6b71c NC |
289 | However, Ian wrote the following, regarding removing the line |
290 | below, which explains why it is still enabled: --djm | |
291 | ||
292 | If you put a patch like that into BFD you need to check all | |
293 | the COFF linkers. I am fairly certain that patch will break | |
294 | coff-i386 (e.g., SCO); see coff_i386_reloc in coff-i386.c | |
295 | where I worked around the problem in a different way. There | |
296 | may very well be a reason that the code works as it does. | |
297 | ||
298 | Hmmm. The first obvious point is that bfd_perform_relocation | |
299 | should not have any tests that depend upon the flavour. It's | |
300 | seem like entirely the wrong place for such a thing. The | |
301 | second obvious point is that the current code ignores the | |
1049f94e | 302 | reloc addend when producing relocatable output for COFF. |
4eb6b71c NC |
303 | That's peculiar. In fact, I really have no idea what the |
304 | point of the line you want to remove is. | |
305 | ||
306 | A typical COFF reloc subtracts the old value of the symbol | |
307 | and adds in the new value to the location in the object file | |
308 | (if it's a pc relative reloc it adds the difference between | |
309 | the symbol value and the location). When relocating we need | |
310 | to preserve that property. | |
311 | ||
312 | BFD handles this by setting the addend to the negative of the | |
313 | old value of the symbol. Unfortunately it handles common | |
314 | symbols in a non-standard way (it doesn't subtract the old | |
315 | value) but that's a different story (we can't change it | |
316 | without losing backward compatibility with old object files) | |
317 | (coff-i386 does subtract the old value, to be compatible with | |
318 | existing coff-i386 targets, like SCO). | |
319 | ||
1049f94e AM |
320 | So everything works fine when not producing relocatable |
321 | output. When we are producing relocatable output, logically | |
4eb6b71c | 322 | we should do exactly what we do when not producing |
1049f94e | 323 | relocatable output. Therefore, your patch is correct. In |
4eb6b71c NC |
324 | fact, it should probably always just set reloc_entry->addend |
325 | to 0 for all cases, since it is, in fact, going to add the | |
326 | value into the object file. This won't hurt the COFF code, | |
327 | which doesn't use the addend; I'm not sure what it will do | |
328 | to other formats (the thing to check for would be whether | |
329 | any formats both use the addend and set partial_inplace). | |
330 | ||
1049f94e | 331 | When I wanted to make coff-i386 produce relocatable output, |
4eb6b71c NC |
332 | I ran into the problem that you are running into: I wanted |
333 | to remove that line. Rather than risk it, I made the | |
334 | coff-i386 relocs use a special function; it's coff_i386_reloc | |
335 | in coff-i386.c. The function specifically adds the addend | |
336 | field into the object file, knowing that bfd_perform_relocation | |
337 | is not going to. If you remove that line, then coff-i386.c | |
338 | will wind up adding the addend field in twice. It's trivial | |
339 | to fix; it just needs to be done. | |
340 | ||
341 | The problem with removing the line is just that it may break | |
342 | some working code. With BFD it's hard to be sure of anything. | |
343 | The right way to deal with this is simply to build and test at | |
344 | least all the supported COFF targets. It should be | |
345 | straightforward if time and disk space consuming. For each | |
346 | target: | |
347 | 1) build the linker | |
348 | 2) generate some executable, and link it using -r (I would | |
349 | probably use paranoia.o and link against newlib/libc.a, | |
350 | which for all the supported targets would be available in | |
351 | /usr/cygnus/progressive/H-host/target/lib/libc.a). | |
352 | 3) make the change to reloc.c | |
353 | 4) rebuild the linker | |
354 | 5) repeat step 2 | |
355 | 6) if the resulting object files are the same, you have at | |
356 | least made it no worse | |
357 | 7) if they are different you have to figure out which | |
358 | version is right. */ | |
252b5132 RH |
359 | relocation -= reloc_entry->addend; |
360 | #endif | |
361 | reloc_entry->addend = 0; | |
362 | } | |
363 | else | |
364 | { | |
365 | reloc_entry->addend = relocation; | |
366 | } | |
367 | } | |
368 | } | |
369 | else | |
370 | { | |
371 | reloc_entry->addend = 0; | |
372 | } | |
373 | ||
374 | /* FIXME: This overflow checking is incomplete, because the value | |
375 | might have overflowed before we get here. For a correct check we | |
376 | need to compute the value in a size larger than bitsize, but we | |
377 | can't reasonably do that for a reloc the same size as a host | |
378 | machine word. | |
379 | FIXME: We should also do overflow checking on the result after | |
380 | adding in the value contained in the object file. */ | |
381 | if (howto->complain_on_overflow != complain_overflow_dont) | |
382 | { | |
383 | bfd_vma check; | |
384 | ||
385 | /* Get the value that will be used for the relocation, but | |
386 | starting at bit position zero. */ | |
387 | if (howto->rightshift > howto->bitpos) | |
388 | check = relocation >> (howto->rightshift - howto->bitpos); | |
389 | else | |
390 | check = relocation << (howto->bitpos - howto->rightshift); | |
391 | switch (howto->complain_on_overflow) | |
392 | { | |
393 | case complain_overflow_signed: | |
394 | { | |
395 | /* Assumes two's complement. */ | |
396 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; | |
397 | bfd_signed_vma reloc_signed_min = ~reloc_signed_max; | |
398 | ||
399 | /* The above right shift is incorrect for a signed value. | |
400 | Fix it up by forcing on the upper bits. */ | |
401 | if (howto->rightshift > howto->bitpos | |
402 | && (bfd_signed_vma) relocation < 0) | |
403 | check |= ((bfd_vma) - 1 | |
404 | & ~((bfd_vma) - 1 | |
405 | >> (howto->rightshift - howto->bitpos))); | |
406 | if ((bfd_signed_vma) check > reloc_signed_max | |
407 | || (bfd_signed_vma) check < reloc_signed_min) | |
408 | flag = bfd_reloc_overflow; | |
409 | } | |
410 | break; | |
411 | case complain_overflow_unsigned: | |
412 | { | |
413 | /* Assumes two's complement. This expression avoids | |
414 | overflow if howto->bitsize is the number of bits in | |
415 | bfd_vma. */ | |
416 | bfd_vma reloc_unsigned_max = | |
417 | (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; | |
418 | ||
419 | if ((bfd_vma) check > reloc_unsigned_max) | |
420 | flag = bfd_reloc_overflow; | |
421 | } | |
422 | break; | |
423 | case complain_overflow_bitfield: | |
424 | { | |
425 | /* Assumes two's complement. This expression avoids | |
426 | overflow if howto->bitsize is the number of bits in | |
427 | bfd_vma. */ | |
428 | bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; | |
429 | ||
430 | if (((bfd_vma) check & ~reloc_bits) != 0 | |
dc810e39 AM |
431 | && (((bfd_vma) check & ~reloc_bits) |
432 | != (-(bfd_vma) 1 & ~reloc_bits))) | |
252b5132 RH |
433 | { |
434 | /* The above right shift is incorrect for a signed | |
435 | value. See if turning on the upper bits fixes the | |
436 | overflow. */ | |
437 | if (howto->rightshift > howto->bitpos | |
438 | && (bfd_signed_vma) relocation < 0) | |
439 | { | |
440 | check |= ((bfd_vma) - 1 | |
441 | & ~((bfd_vma) - 1 | |
442 | >> (howto->rightshift - howto->bitpos))); | |
dc810e39 AM |
443 | if (((bfd_vma) check & ~reloc_bits) |
444 | != (-(bfd_vma) 1 & ~reloc_bits)) | |
252b5132 RH |
445 | flag = bfd_reloc_overflow; |
446 | } | |
447 | else | |
448 | flag = bfd_reloc_overflow; | |
449 | } | |
450 | } | |
451 | break; | |
452 | default: | |
453 | abort (); | |
454 | } | |
455 | } | |
456 | ||
4eb6b71c NC |
457 | /* Either we are relocating all the way, or we don't want to apply |
458 | the relocation to the reloc entry (probably because there isn't | |
459 | any room in the output format to describe addends to relocs). */ | |
252b5132 RH |
460 | |
461 | /* The cast to bfd_vma avoids a bug in the Alpha OSF/1 C compiler | |
462 | (OSF version 1.3, compiler version 3.11). It miscompiles the | |
463 | following program: | |
464 | ||
465 | struct str | |
466 | { | |
467 | unsigned int i0; | |
468 | } s = { 0 }; | |
469 | ||
470 | int | |
471 | main () | |
472 | { | |
473 | unsigned long x; | |
474 | ||
475 | x = 0x100000000; | |
476 | x <<= (unsigned long) s.i0; | |
477 | if (x == 0) | |
478 | printf ("failed\n"); | |
479 | else | |
480 | printf ("succeeded (%lx)\n", x); | |
481 | } | |
482 | */ | |
483 | ||
484 | relocation >>= (bfd_vma) howto->rightshift; | |
485 | ||
4eb6b71c | 486 | /* Shift everything up to where it's going to be used. */ |
252b5132 RH |
487 | relocation <<= (bfd_vma) howto->bitpos; |
488 | ||
4eb6b71c | 489 | /* Wait for the day when all have the mask in them. */ |
252b5132 RH |
490 | |
491 | /* What we do: | |
492 | i instruction to be left alone | |
493 | o offset within instruction | |
494 | r relocation offset to apply | |
495 | S src mask | |
496 | D dst mask | |
497 | N ~dst mask | |
498 | A part 1 | |
499 | B part 2 | |
500 | R result | |
501 | ||
502 | Do this: | |
503 | i i i i i o o o o o from bfd_get<size> | |
504 | and S S S S S to get the size offset we want | |
505 | + r r r r r r r r r r to get the final value to place | |
506 | and D D D D D to chop to right size | |
507 | ----------------------- | |
508 | A A A A A | |
509 | And this: | |
510 | ... i i i i i o o o o o from bfd_get<size> | |
511 | and N N N N N get instruction | |
512 | ----------------------- | |
513 | ... B B B B B | |
514 | ||
515 | And then: | |
516 | B B B B B | |
517 | or A A A A A | |
518 | ----------------------- | |
4eb6b71c | 519 | R R R R R R R R R R put into bfd_put<size>. */ |
252b5132 RH |
520 | |
521 | #define DOIT(x) \ | |
522 | x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) + relocation) & howto->dst_mask)) | |
523 | ||
dc810e39 | 524 | location = (bfd_byte *) data + addr; |
252b5132 RH |
525 | switch (howto->size) |
526 | { | |
527 | case 0: | |
528 | { | |
4eb6b71c | 529 | bfd_vma x = get_data (location, 1); |
252b5132 | 530 | DOIT (x); |
4eb6b71c | 531 | put_data ((bfd_vma) x, location, 1); |
252b5132 RH |
532 | } |
533 | break; | |
534 | ||
535 | case 1: | |
536 | if (relocation) | |
537 | { | |
4eb6b71c | 538 | bfd_vma x = get_data (location, 2); |
252b5132 | 539 | DOIT (x); |
4eb6b71c | 540 | put_data ((bfd_vma) x, location, 2); |
252b5132 RH |
541 | } |
542 | break; | |
543 | case 2: | |
544 | if (relocation) | |
545 | { | |
4eb6b71c | 546 | bfd_vma x = get_data (location, 4); |
252b5132 | 547 | DOIT (x); |
4eb6b71c | 548 | put_data ((bfd_vma) x, location, 4); |
252b5132 RH |
549 | } |
550 | break; | |
551 | case -2: | |
552 | { | |
4eb6b71c | 553 | bfd_vma x = get_data (location, 4); |
252b5132 RH |
554 | relocation = -relocation; |
555 | DOIT(x); | |
4eb6b71c | 556 | put_data ((bfd_vma) x, location, 4); |
252b5132 RH |
557 | } |
558 | break; | |
559 | ||
560 | case 3: | |
4eb6b71c | 561 | /* Do nothing. */ |
252b5132 RH |
562 | break; |
563 | ||
564 | case 4: | |
565 | #ifdef BFD64 | |
566 | if (relocation) | |
567 | { | |
dc810e39 | 568 | bfd_vma x = get_data (location, 8); |
252b5132 | 569 | DOIT (x); |
4eb6b71c | 570 | put_data (x, location, 8); |
252b5132 RH |
571 | } |
572 | #else | |
573 | abort (); | |
574 | #endif | |
575 | break; | |
576 | default: | |
577 | return bfd_reloc_other; | |
578 | } | |
579 | if ((howto->complain_on_overflow != complain_overflow_dont) && overflow) | |
580 | return bfd_reloc_overflow; | |
581 | ||
582 | return flag; | |
583 | } | |
584 | ||
585 | /* Relocate a given location using a given value and howto. */ | |
586 | ||
587 | bfd_reloc_status_type | |
dc810e39 | 588 | _bfd_do_ns32k_reloc_contents (howto, input_bfd, relocation, location, |
252b5132 RH |
589 | get_data, put_data) |
590 | reloc_howto_type *howto; | |
5f771d47 | 591 | bfd *input_bfd ATTRIBUTE_UNUSED; |
252b5132 RH |
592 | bfd_vma relocation; |
593 | bfd_byte *location; | |
dc810e39 | 594 | bfd_vma (*get_data) PARAMS ((bfd_byte *, int)); |
4eb6b71c | 595 | void (*put_data) PARAMS ((bfd_vma, bfd_byte *, int)); |
252b5132 RH |
596 | { |
597 | int size; | |
598 | bfd_vma x; | |
b34976b6 | 599 | bfd_boolean overflow; |
252b5132 RH |
600 | |
601 | /* If the size is negative, negate RELOCATION. This isn't very | |
602 | general. */ | |
603 | if (howto->size < 0) | |
604 | relocation = -relocation; | |
605 | ||
606 | /* Get the value we are going to relocate. */ | |
607 | size = bfd_get_reloc_size (howto); | |
608 | switch (size) | |
609 | { | |
610 | default: | |
611 | case 0: | |
612 | abort (); | |
613 | case 1: | |
614 | case 2: | |
615 | case 4: | |
616 | #ifdef BFD64 | |
617 | case 8: | |
618 | #endif | |
dc810e39 | 619 | x = get_data (location, size); |
252b5132 RH |
620 | break; |
621 | } | |
622 | ||
623 | /* Check for overflow. FIXME: We may drop bits during the addition | |
624 | which we don't check for. We must either check at every single | |
625 | operation, which would be tedious, or we must do the computations | |
626 | in a type larger than bfd_vma, which would be inefficient. */ | |
b34976b6 | 627 | overflow = FALSE; |
252b5132 RH |
628 | if (howto->complain_on_overflow != complain_overflow_dont) |
629 | { | |
630 | bfd_vma check; | |
631 | bfd_signed_vma signed_check; | |
632 | bfd_vma add; | |
633 | bfd_signed_vma signed_add; | |
634 | ||
635 | if (howto->rightshift == 0) | |
636 | { | |
637 | check = relocation; | |
638 | signed_check = (bfd_signed_vma) relocation; | |
639 | } | |
640 | else | |
641 | { | |
642 | /* Drop unwanted bits from the value we are relocating to. */ | |
643 | check = relocation >> howto->rightshift; | |
644 | ||
645 | /* If this is a signed value, the rightshift just dropped | |
646 | leading 1 bits (assuming twos complement). */ | |
647 | if ((bfd_signed_vma) relocation >= 0) | |
648 | signed_check = check; | |
649 | else | |
650 | signed_check = (check | |
651 | | ((bfd_vma) - 1 | |
652 | & ~((bfd_vma) - 1 >> howto->rightshift))); | |
653 | } | |
654 | ||
655 | /* Get the value from the object file. */ | |
656 | add = x & howto->src_mask; | |
657 | ||
658 | /* Get the value from the object file with an appropriate sign. | |
659 | The expression involving howto->src_mask isolates the upper | |
660 | bit of src_mask. If that bit is set in the value we are | |
661 | adding, it is negative, and we subtract out that number times | |
662 | two. If src_mask includes the highest possible bit, then we | |
663 | can not get the upper bit, but that does not matter since | |
664 | signed_add needs no adjustment to become negative in that | |
665 | case. */ | |
666 | signed_add = add; | |
667 | if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0) | |
668 | signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1; | |
669 | ||
670 | /* Add the value from the object file, shifted so that it is a | |
671 | straight number. */ | |
672 | if (howto->bitpos == 0) | |
673 | { | |
674 | check += add; | |
675 | signed_check += signed_add; | |
676 | } | |
677 | else | |
678 | { | |
679 | check += add >> howto->bitpos; | |
680 | ||
681 | /* For the signed case we use ADD, rather than SIGNED_ADD, | |
682 | to avoid warnings from SVR4 cc. This is OK since we | |
5c4491d3 | 683 | explicitly handle the sign bits. */ |
252b5132 RH |
684 | if (signed_add >= 0) |
685 | signed_check += add >> howto->bitpos; | |
686 | else | |
687 | signed_check += ((add >> howto->bitpos) | |
688 | | ((bfd_vma) - 1 | |
689 | & ~((bfd_vma) - 1 >> howto->bitpos))); | |
690 | } | |
691 | ||
692 | switch (howto->complain_on_overflow) | |
693 | { | |
694 | case complain_overflow_signed: | |
695 | { | |
696 | /* Assumes two's complement. */ | |
697 | bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; | |
698 | bfd_signed_vma reloc_signed_min = ~reloc_signed_max; | |
699 | ||
700 | if (signed_check > reloc_signed_max | |
701 | || signed_check < reloc_signed_min) | |
b34976b6 | 702 | overflow = TRUE; |
252b5132 RH |
703 | } |
704 | break; | |
705 | case complain_overflow_unsigned: | |
706 | { | |
707 | /* Assumes two's complement. This expression avoids | |
708 | overflow if howto->bitsize is the number of bits in | |
709 | bfd_vma. */ | |
710 | bfd_vma reloc_unsigned_max = | |
711 | (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; | |
712 | ||
713 | if (check > reloc_unsigned_max) | |
b34976b6 | 714 | overflow = TRUE; |
252b5132 RH |
715 | } |
716 | break; | |
717 | case complain_overflow_bitfield: | |
718 | { | |
719 | /* Assumes two's complement. This expression avoids | |
720 | overflow if howto->bitsize is the number of bits in | |
721 | bfd_vma. */ | |
722 | bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1; | |
723 | ||
724 | if ((check & ~reloc_bits) != 0 | |
725 | && (((bfd_vma) signed_check & ~reloc_bits) | |
dc810e39 | 726 | != (-(bfd_vma) 1 & ~reloc_bits))) |
b34976b6 | 727 | overflow = TRUE; |
252b5132 RH |
728 | } |
729 | break; | |
730 | default: | |
731 | abort (); | |
732 | } | |
733 | } | |
734 | ||
735 | /* Put RELOCATION in the right bits. */ | |
736 | relocation >>= (bfd_vma) howto->rightshift; | |
737 | relocation <<= (bfd_vma) howto->bitpos; | |
738 | ||
739 | /* Add RELOCATION to the right bits of X. */ | |
740 | x = ((x & ~howto->dst_mask) | |
741 | | (((x & howto->src_mask) + relocation) & howto->dst_mask)); | |
742 | ||
743 | /* Put the relocated value back in the object file. */ | |
744 | switch (size) | |
745 | { | |
746 | default: | |
747 | case 0: | |
748 | abort (); | |
749 | case 1: | |
750 | case 2: | |
751 | case 4: | |
752 | #ifdef BFD64 | |
753 | case 8: | |
754 | #endif | |
dc810e39 | 755 | put_data (x, location, size); |
252b5132 RH |
756 | break; |
757 | } | |
758 | ||
759 | return overflow ? bfd_reloc_overflow : bfd_reloc_ok; | |
760 | } | |
761 | ||
762 | bfd_reloc_status_type | |
763 | _bfd_ns32k_reloc_disp (abfd, reloc_entry, symbol, data, input_section, | |
764 | output_bfd, error_message) | |
765 | bfd *abfd; | |
766 | arelent *reloc_entry; | |
fc0a2244 | 767 | struct bfd_symbol *symbol; |
252b5132 RH |
768 | PTR data; |
769 | asection *input_section; | |
770 | bfd *output_bfd; | |
771 | char **error_message; | |
772 | { | |
773 | return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, | |
774 | output_bfd, error_message, | |
775 | _bfd_ns32k_get_displacement, | |
776 | _bfd_ns32k_put_displacement); | |
777 | } | |
778 | ||
779 | bfd_reloc_status_type | |
780 | _bfd_ns32k_reloc_imm (abfd, reloc_entry, symbol, data, input_section, | |
781 | output_bfd, error_message) | |
782 | bfd *abfd; | |
783 | arelent *reloc_entry; | |
fc0a2244 | 784 | struct bfd_symbol *symbol; |
252b5132 RH |
785 | PTR data; |
786 | asection *input_section; | |
787 | bfd *output_bfd; | |
788 | char **error_message; | |
789 | { | |
790 | return do_ns32k_reloc (abfd, reloc_entry, symbol, data, input_section, | |
791 | output_bfd, error_message, _bfd_ns32k_get_immediate, | |
792 | _bfd_ns32k_put_immediate); | |
793 | } | |
794 | ||
795 | bfd_reloc_status_type | |
796 | _bfd_ns32k_final_link_relocate (howto, input_bfd, input_section, contents, | |
797 | address, value, addend) | |
798 | reloc_howto_type *howto; | |
799 | bfd *input_bfd; | |
800 | asection *input_section; | |
801 | bfd_byte *contents; | |
802 | bfd_vma address; | |
803 | bfd_vma value; | |
804 | bfd_vma addend; | |
805 | { | |
806 | bfd_vma relocation; | |
eea6121a | 807 | bfd_size_type sz; |
252b5132 RH |
808 | |
809 | /* Sanity check the address. */ | |
eea6121a AM |
810 | sz = input_section->rawsize ? input_section->rawsize : input_section->size; |
811 | if (address > sz) | |
252b5132 RH |
812 | return bfd_reloc_outofrange; |
813 | ||
814 | /* This function assumes that we are dealing with a basic relocation | |
815 | against a symbol. We want to compute the value of the symbol to | |
816 | relocate to. This is just VALUE, the value of the symbol, plus | |
817 | ADDEND, any addend associated with the reloc. */ | |
818 | relocation = value + addend; | |
819 | ||
820 | /* If the relocation is PC relative, we want to set RELOCATION to | |
821 | the distance between the symbol (currently in RELOCATION) and the | |
822 | location we are relocating. Some targets (e.g., i386-aout) | |
823 | arrange for the contents of the section to be the negative of the | |
824 | offset of the location within the section; for such targets | |
b34976b6 | 825 | pcrel_offset is FALSE. Other targets (e.g., m88kbcs or ELF) |
252b5132 | 826 | simply leave the contents of the section as zero; for such |
b34976b6 | 827 | targets pcrel_offset is TRUE. If pcrel_offset is FALSE we do not |
252b5132 RH |
828 | need to subtract out the offset of the location within the |
829 | section (which is just ADDRESS). */ | |
830 | if (howto->pc_relative) | |
831 | { | |
832 | relocation -= (input_section->output_section->vma | |
833 | + input_section->output_offset); | |
834 | if (howto->pcrel_offset) | |
835 | relocation -= address; | |
836 | } | |
837 | ||
838 | return _bfd_ns32k_relocate_contents (howto, input_bfd, relocation, | |
839 | contents + address); | |
840 | } |