projects / deliverable / binutils-gdb.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
daily update
[deliverable/binutils-gdb.git] / bfd / nlm32-alpha.c
CommitLineData
252b5132 1/* Support for 32-bit Alpha NLM (NetWare Loadable Module)
0f867abe
AM		 2 Copyright 1993, 1994, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
252b5132
RH		 4 Written by Ian Lance Taylor, Cygnus Support.
5
6This file is part of BFD, the Binary File Descriptor library.
7
8This program is free software; you can redistribute it and/or modify
9it under the terms of the GNU General Public License as published by
10the Free Software Foundation; either version 2 of the License, or
11(at your option) any later version.
12
13This program is distributed in the hope that it will be useful,
14but WITHOUT ANY WARRANTY; without even the implied warranty of
15MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16GNU General Public License for more details.
17
18You should have received a copy of the GNU General Public License
19along with this program; if not, write to the Free Software
20Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21
22/* This file describes the 32 bit Alpha NLM format. You might think
23 that an Alpha chip would use a 64 bit format, but, for some reason,
24 it doesn't. */
25
26#include "bfd.h"
27#include "sysdep.h"
28#include "libbfd.h"
29
30#define ARCH_SIZE 32
31
32#include "nlm/alpha-ext.h"
33#define Nlm_External_Fixed_Header Nlm32_alpha_External_Fixed_Header
34
35#include "libnlm.h"
36
b34976b6 37static bfd_boolean nlm_alpha_backend_object_p
252b5132 38 PARAMS ((bfd *));
b34976b6 39static bfd_boolean nlm_alpha_write_prefix
252b5132 40 PARAMS ((bfd *));
b34976b6 41static bfd_boolean nlm_alpha_read_reloc
252b5132 42 PARAMS ((bfd *, nlmNAME(symbol_type) *, asection **, arelent *));
b34976b6 43static bfd_boolean nlm_alpha_mangle_relocs
0f867abe 44 PARAMS ((bfd *, asection *, const PTR, bfd_vma, bfd_size_type));
b34976b6 45static bfd_boolean nlm_alpha_read_import
252b5132 46 PARAMS ((bfd *, nlmNAME(symbol_type) *));
b34976b6 47static bfd_boolean nlm_alpha_write_import
252b5132 48 PARAMS ((bfd *, asection *, arelent *));
b34976b6 49static bfd_boolean nlm_alpha_set_public_section
252b5132
RH		 50 PARAMS ((bfd *, nlmNAME(symbol_type) *));
51static bfd_vma nlm_alpha_get_public_offset
52 PARAMS ((bfd *, asymbol *));
b34976b6 53static bfd_boolean nlm_alpha_write_external
252b5132
RH		 54 PARAMS ((bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *));
55\f
56/* Alpha NLM's have a prefix header before the standard NLM. This
57 function reads it in, verifies the version, and seeks the bfd to
58 the location before the regular NLM header. */
59
b34976b6 60static bfd_boolean
252b5132
RH		 61nlm_alpha_backend_object_p (abfd)
62 bfd *abfd;
63{
64 struct nlm32_alpha_external_prefix_header s;
dc810e39 65 file_ptr size;
252b5132 66
dc810e39 67 if (bfd_bread ((PTR) &s, (bfd_size_type) sizeof s, abfd) != sizeof s)
b34976b6 68 return FALSE;
252b5132 69
dc810e39 70 if (H_GET_32 (abfd, s.magic) != NLM32_ALPHA_MAGIC)
b34976b6 71 return FALSE;
252b5132
RH		 72
73 /* FIXME: Should we check the format number? */
74
75 /* Skip to the end of the header. */
dc810e39 76 size = H_GET_32 (abfd, s.size);
252b5132 77 if (bfd_seek (abfd, size, SEEK_SET) != 0)
b34976b6 78 return FALSE;
252b5132 79
b34976b6 80 return TRUE;
252b5132
RH		 81}
82
83/* Write out the prefix. */
84
b34976b6 85static bfd_boolean
252b5132
RH		 86nlm_alpha_write_prefix (abfd)
87 bfd *abfd;
88{
89 struct nlm32_alpha_external_prefix_header s;
90
91 memset (&s, 0, sizeof s);
dc810e39
AM		 92 H_PUT_32 (abfd, NLM32_ALPHA_MAGIC, s.magic);
93 H_PUT_32 (abfd, 2, s.format);
94 H_PUT_32 (abfd, sizeof s, s.size);
95 if (bfd_bwrite ((PTR) &s, (bfd_size_type) sizeof s, abfd) != sizeof s)
b34976b6
AM		 96 return FALSE;
97 return TRUE;
252b5132
RH		 98}
99\f
1a101a42
AM		 100#define ONES(n) (((bfd_vma) 1 << ((n) - 1) << 1) - 1)
101
252b5132
RH		 102/* How to process the various reloc types. */
103
104static reloc_howto_type nlm32_alpha_howto_table[] =
105{
106 /* Reloc type 0 is ignored by itself. However, it appears after a
107 GPDISP reloc to identify the location where the low order 16 bits
108 of the gp register are loaded. */
109 HOWTO (ALPHA_R_IGNORE, /* type */
110 0, /* rightshift */
111 0, /* size (0 = byte, 1 = short, 2 = long) */
112 8, /* bitsize */
b34976b6 113 FALSE, /* pc_relative */
252b5132
RH		 114 0, /* bitpos */
115 complain_overflow_dont, /* complain_on_overflow */
116 0, /* special_function */
117 "IGNORE", /* name */
b34976b6 118 FALSE, /* partial_inplace */
252b5132
RH		 119 0, /* src_mask */
120 0, /* dst_mask */
b34976b6 121 FALSE), /* pcrel_offset */
252b5132
RH		 122
123 /* A 32 bit reference to a symbol. */
124 HOWTO (ALPHA_R_REFLONG, /* type */
125 0, /* rightshift */
126 2, /* size (0 = byte, 1 = short, 2 = long) */
127 32, /* bitsize */
b34976b6 128 FALSE, /* pc_relative */
252b5132
RH		 129 0, /* bitpos */
130 complain_overflow_bitfield, /* complain_on_overflow */
131 0, /* special_function */
132 "REFLONG", /* name */
b34976b6 133 TRUE, /* partial_inplace */
252b5132
RH		 134 0xffffffff, /* src_mask */
135 0xffffffff, /* dst_mask */
b34976b6 136 FALSE), /* pcrel_offset */
252b5132
RH		 137
138 /* A 64 bit reference to a symbol. */
139 HOWTO (ALPHA_R_REFQUAD, /* type */
140 0, /* rightshift */
141 4, /* size (0 = byte, 1 = short, 2 = long) */
142 64, /* bitsize */
b34976b6 143 FALSE, /* pc_relative */
252b5132
RH		 144 0, /* bitpos */
145 complain_overflow_bitfield, /* complain_on_overflow */
146 0, /* special_function */
147 "REFQUAD", /* name */
b34976b6 148 TRUE, /* partial_inplace */
1a101a42
AM		 149 ONES (64), /* src_mask */
150 ONES (64), /* dst_mask */
b34976b6 151 FALSE), /* pcrel_offset */
252b5132
RH		 152
153 /* A 32 bit GP relative offset. This is just like REFLONG except
154 that when the value is used the value of the gp register will be
155 added in. */
156 HOWTO (ALPHA_R_GPREL32, /* type */
157 0, /* rightshift */
158 2, /* size (0 = byte, 1 = short, 2 = long) */
159 32, /* bitsize */
b34976b6 160 FALSE, /* pc_relative */
252b5132
RH		 161 0, /* bitpos */
162 complain_overflow_bitfield, /* complain_on_overflow */
163 0, /* special_function */
164 "GPREL32", /* name */
b34976b6 165 TRUE, /* partial_inplace */
252b5132
RH		 166 0xffffffff, /* src_mask */
167 0xffffffff, /* dst_mask */
b34976b6 168 FALSE), /* pcrel_offset */
252b5132
RH		 169
170 /* Used for an instruction that refers to memory off the GP
171 register. The offset is 16 bits of the 32 bit instruction. This
172 reloc always seems to be against the .lita section. */
173 HOWTO (ALPHA_R_LITERAL, /* type */
174 0, /* rightshift */
175 2, /* size (0 = byte, 1 = short, 2 = long) */
176 16, /* bitsize */
b34976b6 177 FALSE, /* pc_relative */
252b5132
RH		 178 0, /* bitpos */
179 complain_overflow_signed, /* complain_on_overflow */
180 0, /* special_function */
181 "LITERAL", /* name */
b34976b6 182 TRUE, /* partial_inplace */
252b5132
RH		 183 0xffff, /* src_mask */
184 0xffff, /* dst_mask */
b34976b6 185 FALSE), /* pcrel_offset */
252b5132
RH		 186
187 /* This reloc only appears immediately following a LITERAL reloc.
188 It identifies a use of the literal. It seems that the linker can
189 use this to eliminate a portion of the .lita section. The symbol
190 index is special: 1 means the literal address is in the base
191 register of a memory format instruction; 2 means the literal
192 address is in the byte offset register of a byte-manipulation
193 instruction; 3 means the literal address is in the target
194 register of a jsr instruction. This does not actually do any
195 relocation. */
196 HOWTO (ALPHA_R_LITUSE, /* type */
197 0, /* rightshift */
198 2, /* size (0 = byte, 1 = short, 2 = long) */
199 32, /* bitsize */
b34976b6 200 FALSE, /* pc_relative */
252b5132
RH		 201 0, /* bitpos */
202 complain_overflow_dont, /* complain_on_overflow */
203 0, /* special_function */
204 "LITUSE", /* name */
b34976b6 205 FALSE, /* partial_inplace */
252b5132
RH		 206 0, /* src_mask */
207 0, /* dst_mask */
b34976b6 208 FALSE), /* pcrel_offset */
252b5132
RH		 209
210 /* Load the gp register. This is always used for a ldah instruction
211 which loads the upper 16 bits of the gp register. The next reloc
212 will be an IGNORE reloc which identifies the location of the lda
213 instruction which loads the lower 16 bits. The symbol index of
214 the GPDISP instruction appears to actually be the number of bytes
215 between the ldah and lda instructions. This gives two different
216 ways to determine where the lda instruction is; I don't know why
217 both are used. The value to use for the relocation is the
218 difference between the GP value and the current location; the
219 load will always be done against a register holding the current
220 address. */
221 HOWTO (ALPHA_R_GPDISP, /* type */
222 16, /* rightshift */
223 2, /* size (0 = byte, 1 = short, 2 = long) */
224 16, /* bitsize */
b34976b6 225 TRUE, /* pc_relative */
252b5132
RH		 226 0, /* bitpos */
227 complain_overflow_dont, /* complain_on_overflow */
228 0, /* special_function */
229 "GPDISP", /* name */
b34976b6 230 TRUE, /* partial_inplace */
252b5132
RH		 231 0xffff, /* src_mask */
232 0xffff, /* dst_mask */
b34976b6 233 TRUE), /* pcrel_offset */
252b5132
RH		 234
235 /* A 21 bit branch. The native assembler generates these for
236 branches within the text segment, and also fills in the PC
237 relative offset in the instruction. It seems to me that this
238 reloc, unlike the others, is not partial_inplace. */
239 HOWTO (ALPHA_R_BRADDR, /* type */
240 2, /* rightshift */
241 2, /* size (0 = byte, 1 = short, 2 = long) */
242 21, /* bitsize */
b34976b6 243 TRUE, /* pc_relative */
252b5132
RH		 244 0, /* bitpos */
245 complain_overflow_signed, /* complain_on_overflow */
246 0, /* special_function */
247 "BRADDR", /* name */
b34976b6 248 FALSE, /* partial_inplace */
252b5132
RH		 249 0, /* src_mask */
250 0x1fffff, /* dst_mask */
b34976b6 251 FALSE), /* pcrel_offset */
252b5132
RH		 252
253 /* A hint for a jump to a register. */
254 HOWTO (ALPHA_R_HINT, /* type */
255 2, /* rightshift */
256 2, /* size (0 = byte, 1 = short, 2 = long) */
257 14, /* bitsize */
b34976b6 258 FALSE, /* pc_relative */
252b5132
RH		 259 0, /* bitpos */
260 complain_overflow_dont, /* complain_on_overflow */
261 0, /* special_function */
262 "HINT", /* name */
b34976b6 263 TRUE, /* partial_inplace */
252b5132
RH		 264 0x3fff, /* src_mask */
265 0x3fff, /* dst_mask */
b34976b6 266 FALSE), /* pcrel_offset */
252b5132
RH		 267
268 /* 16 bit PC relative offset. */
269 HOWTO (ALPHA_R_SREL16, /* type */
270 0, /* rightshift */
271 1, /* size (0 = byte, 1 = short, 2 = long) */
272 16, /* bitsize */
b34976b6 273 TRUE, /* pc_relative */
252b5132
RH		 274 0, /* bitpos */
275 complain_overflow_signed, /* complain_on_overflow */
276 0, /* special_function */
277 "SREL16", /* name */
b34976b6 278 TRUE, /* partial_inplace */
252b5132
RH		 279 0xffff, /* src_mask */
280 0xffff, /* dst_mask */
b34976b6 281 FALSE), /* pcrel_offset */
252b5132
RH		 282
283 /* 32 bit PC relative offset. */
284 HOWTO (ALPHA_R_SREL32, /* type */
285 0, /* rightshift */
286 2, /* size (0 = byte, 1 = short, 2 = long) */
287 32, /* bitsize */
b34976b6 288 TRUE, /* pc_relative */
252b5132
RH		 289 0, /* bitpos */
290 complain_overflow_signed, /* complain_on_overflow */
291 0, /* special_function */
292 "SREL32", /* name */
b34976b6 293 TRUE, /* partial_inplace */
252b5132
RH		 294 0xffffffff, /* src_mask */
295 0xffffffff, /* dst_mask */
b34976b6 296 FALSE), /* pcrel_offset */
252b5132
RH		 297
298 /* A 64 bit PC relative offset. */
299 HOWTO (ALPHA_R_SREL64, /* type */
300 0, /* rightshift */
301 4, /* size (0 = byte, 1 = short, 2 = long) */
302 64, /* bitsize */
b34976b6 303 TRUE, /* pc_relative */
252b5132
RH		 304 0, /* bitpos */
305 complain_overflow_signed, /* complain_on_overflow */
306 0, /* special_function */
307 "SREL64", /* name */
b34976b6 308 TRUE, /* partial_inplace */
1a101a42
AM		 309 ONES (64), /* src_mask */
310 ONES (64), /* dst_mask */
b34976b6 311 FALSE), /* pcrel_offset */
252b5132
RH		 312
313 /* Push a value on the reloc evaluation stack. */
314 HOWTO (ALPHA_R_OP_PUSH, /* type */
315 0, /* rightshift */
316 0, /* size (0 = byte, 1 = short, 2 = long) */
317 0, /* bitsize */
b34976b6 318 FALSE, /* pc_relative */
252b5132
RH		 319 0, /* bitpos */
320 complain_overflow_dont, /* complain_on_overflow */
321 0, /* special_function */
322 "OP_PUSH", /* name */
b34976b6 323 FALSE, /* partial_inplace */
252b5132
RH		 324 0, /* src_mask */
325 0, /* dst_mask */
b34976b6 326 FALSE), /* pcrel_offset */
252b5132
RH		 327
328 /* Store the value from the stack at the given address. Store it in
329 a bitfield of size r_size starting at bit position r_offset. */
330 HOWTO (ALPHA_R_OP_STORE, /* type */
331 0, /* rightshift */
332 4, /* size (0 = byte, 1 = short, 2 = long) */
333 64, /* bitsize */
b34976b6 334 FALSE, /* pc_relative */
252b5132
RH		 335 0, /* bitpos */
336 complain_overflow_dont, /* complain_on_overflow */
337 0, /* special_function */
338 "OP_STORE", /* name */
b34976b6 339 FALSE, /* partial_inplace */
252b5132 340 0, /* src_mask */
1a101a42 341 ONES (64), /* dst_mask */
b34976b6 342 FALSE), /* pcrel_offset */
252b5132
RH		 343
344 /* Subtract the reloc address from the value on the top of the
345 relocation stack. */
346 HOWTO (ALPHA_R_OP_PSUB, /* type */
347 0, /* rightshift */
348 0, /* size (0 = byte, 1 = short, 2 = long) */
349 0, /* bitsize */
b34976b6 350 FALSE, /* pc_relative */
252b5132
RH		 351 0, /* bitpos */
352 complain_overflow_dont, /* complain_on_overflow */
353 0, /* special_function */
354 "OP_PSUB", /* name */
b34976b6 355 FALSE, /* partial_inplace */
252b5132
RH		 356 0, /* src_mask */
357 0, /* dst_mask */
b34976b6 358 FALSE), /* pcrel_offset */
252b5132
RH		 359
360 /* Shift the value on the top of the relocation stack right by the
361 given value. */
362 HOWTO (ALPHA_R_OP_PRSHIFT, /* type */
363 0, /* rightshift */
364 0, /* size (0 = byte, 1 = short, 2 = long) */
365 0, /* bitsize */
b34976b6 366 FALSE, /* pc_relative */
252b5132
RH		 367 0, /* bitpos */
368 complain_overflow_dont, /* complain_on_overflow */
369 0, /* special_function */
370 "OP_PRSHIFT", /* name */
b34976b6 371 FALSE, /* partial_inplace */
252b5132
RH		 372 0, /* src_mask */
373 0, /* dst_mask */
b34976b6 374 FALSE), /* pcrel_offset */
252b5132
RH		 375
376 /* Adjust the GP value for a new range in the object file. */
377 HOWTO (ALPHA_R_GPVALUE, /* type */
378 0, /* rightshift */
379 0, /* size (0 = byte, 1 = short, 2 = long) */
380 0, /* bitsize */
b34976b6 381 FALSE, /* pc_relative */
252b5132
RH		 382 0, /* bitpos */
383 complain_overflow_dont, /* complain_on_overflow */
384 0, /* special_function */
385 "GPVALUE", /* name */
b34976b6 386 FALSE, /* partial_inplace */
252b5132
RH		 387 0, /* src_mask */
388 0, /* dst_mask */
b34976b6 389 FALSE) /* pcrel_offset */
252b5132
RH		 390};
391
392static reloc_howto_type nlm32_alpha_nw_howto =
393 HOWTO (ALPHA_R_NW_RELOC, /* type */
394 0, /* rightshift */
395 0, /* size (0 = byte, 1 = short, 2 = long) */
396 0, /* bitsize */
b34976b6 397 FALSE, /* pc_relative */
252b5132
RH		 398 0, /* bitpos */
399 complain_overflow_dont, /* complain_on_overflow */
400 0, /* special_function */
401 "NW_RELOC", /* name */
b34976b6 402 FALSE, /* partial_inplace */
252b5132
RH		 403 0, /* src_mask */
404 0, /* dst_mask */
b34976b6 405 FALSE); /* pcrel_offset */
252b5132
RH		 406
407/* Read an Alpha NLM reloc. This routine keeps some static data which
408 it uses when handling local relocs. This only works correctly
409 because all the local relocs are read at once. */
410
b34976b6 411static bfd_boolean
252b5132
RH		 412nlm_alpha_read_reloc (abfd, sym, secp, rel)
413 bfd *abfd;
414 nlmNAME(symbol_type) *sym;
415 asection **secp;
416 arelent *rel;
417{
418 static bfd_vma gp_value;
419 static bfd_vma lita_address;
420 struct nlm32_alpha_external_reloc ext;
421 bfd_vma r_vaddr;
422 long r_symndx;
423 int r_type, r_extern, r_offset, r_size;
424 asection *code_sec, *data_sec;
425
426 /* Read the reloc from the file. */
dc810e39 427 if (bfd_bread (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext)
b34976b6 428 return FALSE;
252b5132
RH		 429
430 /* Swap in the reloc information. */
dc810e39
AM		 431 r_vaddr = H_GET_64 (abfd, ext.r_vaddr);
432 r_symndx = H_GET_32 (abfd, ext.r_symndx);
252b5132
RH		 433
434 BFD_ASSERT (bfd_little_endian (abfd));
435
436 r_type = ((ext.r_bits[0] & RELOC_BITS0_TYPE_LITTLE)
437 >> RELOC_BITS0_TYPE_SH_LITTLE);
438 r_extern = (ext.r_bits[1] & RELOC_BITS1_EXTERN_LITTLE) != 0;
439 r_offset = ((ext.r_bits[1] & RELOC_BITS1_OFFSET_LITTLE)
440 >> RELOC_BITS1_OFFSET_SH_LITTLE);
441 /* Ignore the reserved bits. */
442 r_size = ((ext.r_bits[3] & RELOC_BITS3_SIZE_LITTLE)
443 >> RELOC_BITS3_SIZE_SH_LITTLE);
444
445 /* Fill in the BFD arelent structure. */
446 code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
447 data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
448 if (r_extern)
449 {
450 /* External relocations are only used for imports. */
451 BFD_ASSERT (sym != NULL);
452 /* We don't need to set sym_ptr_ptr for this case. It is set in
453 nlm_canonicalize_reloc. */
454 rel->sym_ptr_ptr = NULL;
455 rel->addend = 0;
456 }
457 else
458 {
459 /* Internal relocations are only used for local relocation
460 fixups. If they are not NW_RELOC or GPDISP or IGNORE, they
461 must be against .text or .data. */
462 BFD_ASSERT (r_type == ALPHA_R_NW_RELOC || sym == NULL);
463 if (r_type == ALPHA_R_NW_RELOC
464 || r_type == ALPHA_R_GPDISP
465 || r_type == ALPHA_R_IGNORE)
466 {
467 rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
468 rel->addend = 0;
469 }
470 else if (r_symndx == ALPHA_RELOC_SECTION_TEXT)
471 {
472 rel->sym_ptr_ptr = code_sec->symbol_ptr_ptr;
473 BFD_ASSERT (bfd_get_section_vma (abfd, code_sec) == 0);
474 rel->addend = 0;
475 }
476 else if (r_symndx == ALPHA_RELOC_SECTION_DATA)
477 {
478 rel->sym_ptr_ptr = data_sec->symbol_ptr_ptr;
479 rel->addend = - bfd_get_section_vma (abfd, data_sec);
480 }
481 else
482 {
483 BFD_ASSERT (0);
484 rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
485 rel->addend = 0;
486 }
487 }
488
489 /* We use the address to determine whether the reloc is in the .text
490 or .data section. R_NW_RELOC relocs don't really have a section,
491 so we put them in .text. */
492 if (r_type == ALPHA_R_NW_RELOC
493 || r_vaddr < bfd_section_size (abfd, code_sec))
494 {
495 *secp = code_sec;
496 rel->address = r_vaddr;
497 }
498 else
499 {
500 *secp = data_sec;
501 rel->address = r_vaddr - bfd_section_size (abfd, code_sec);
502 }
503
504 /* We must adjust the addend based on the type. */
505 BFD_ASSERT ((r_type >= 0 && r_type <= ALPHA_R_GPVALUE)
506 || r_type == ALPHA_R_NW_RELOC);
507
508 switch (r_type)
509 {
510 case ALPHA_R_BRADDR:
511 case ALPHA_R_SREL16:
512 case ALPHA_R_SREL32:
513 case ALPHA_R_SREL64:
514 /* The PC relative relocs do not seem to use the section VMA as
515 a negative addend. */
516 rel->addend = 0;
517 break;
518
519 case ALPHA_R_GPREL32:
520 /* Copy the gp value for this object file into the addend, to
521 ensure that we are not confused by the linker. */
522 if (! r_extern)
523 rel->addend += gp_value;
524 break;
525
526 case ALPHA_R_LITERAL:
527 BFD_ASSERT (! r_extern);
528 rel->addend += lita_address;
529 break;
530
531 case ALPHA_R_LITUSE:
532 case ALPHA_R_GPDISP:
533 /* The LITUSE and GPDISP relocs do not use a symbol, or an
534 addend, but they do use a special code. Put this code in the
535 addend field. */
536 rel->addend = r_symndx;
537 rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
538 break;
539
540 case ALPHA_R_OP_STORE:
541 /* The STORE reloc needs the size and offset fields. We store
542 them in the addend. */
543 BFD_ASSERT (r_offset < 256 && r_size < 256);
544 rel->addend = (r_offset << 8) + r_size;
545 break;
546
547 case ALPHA_R_OP_PUSH:
548 case ALPHA_R_OP_PSUB:
549 case ALPHA_R_OP_PRSHIFT:
550 /* The PUSH, PSUB and PRSHIFT relocs do not actually use an
551 address. I believe that the address supplied is really an
552 addend. */
553 rel->addend = r_vaddr;
554 break;
555
556 case ALPHA_R_GPVALUE:
557 /* Record the new gp value. */
558 gp_value += r_symndx;
559 rel->addend = gp_value;
560 break;
561
562 case ALPHA_R_IGNORE:
563 /* If the type is ALPHA_R_IGNORE, make sure this is a reference
564 to the absolute section so that the reloc is ignored. For
565 some reason the address of this reloc type is not adjusted by
566 the section vma. We record the gp value for this object file
567 here, for convenience when doing the GPDISP relocation. */
568 rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
569 rel->address = r_vaddr;
570 rel->addend = gp_value;
571 break;
572
573 case ALPHA_R_NW_RELOC:
574 /* If this is SETGP, we set the addend to 0. Otherwise we set
575 the addend to the size of the .lita section (this is
576 r_symndx) plus 1. We have already set the address of the
577 reloc to r_vaddr. */
578 if (r_size == ALPHA_R_NW_RELOC_SETGP)
579 {
580 gp_value = r_vaddr;
581 rel->addend = 0;
582 }
583 else if (r_size == ALPHA_R_NW_RELOC_LITA)
584 {
585 lita_address = r_vaddr;
586 rel->addend = r_symndx + 1;
587 }
588 else
589 BFD_ASSERT (0);
590 rel->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
591 break;
592
593 default:
594 break;
595 }
596
597 if (r_type == ALPHA_R_NW_RELOC)
598 rel->howto = &nlm32_alpha_nw_howto;
599 else
600 rel->howto = &nlm32_alpha_howto_table[r_type];
601
b34976b6 602 return TRUE;
252b5132
RH		 603}
604
605/* Mangle Alpha NLM relocs for output. */
606
b34976b6 607static bfd_boolean
252b5132 608nlm_alpha_mangle_relocs (abfd, sec, data, offset, count)
56fc028e
AJ		 609 bfd *abfd ATTRIBUTE_UNUSED;
610 asection *sec ATTRIBUTE_UNUSED;
0f867abe 611 const PTR data ATTRIBUTE_UNUSED;
56fc028e
AJ		 612 bfd_vma offset ATTRIBUTE_UNUSED;
613 bfd_size_type count ATTRIBUTE_UNUSED;
252b5132 614{
b34976b6 615 return TRUE;
252b5132
RH		 616}
617
618/* Read an ALPHA NLM import record */
619
b34976b6 620static bfd_boolean
252b5132
RH		 621nlm_alpha_read_import (abfd, sym)
622 bfd *abfd;
623 nlmNAME(symbol_type) *sym;
624{
625 struct nlm_relent *nlm_relocs; /* relocation records for symbol */
626 bfd_size_type rcount; /* number of relocs */
627 bfd_byte temp[NLM_TARGET_LONG_SIZE]; /* temporary 32-bit value */
628 unsigned char symlength; /* length of symbol name */
629 char *name;
dc810e39 630 bfd_size_type amt;
252b5132 631
dc810e39 632 if (bfd_bread ((PTR) &symlength, (bfd_size_type) sizeof (symlength), abfd)
252b5132 633 != sizeof (symlength))
b34976b6 634 return FALSE;
252b5132 635 sym -> symbol.the_bfd = abfd;
dc810e39 636 name = bfd_alloc (abfd, (bfd_size_type) symlength + 1);
252b5132 637 if (name == NULL)
b34976b6 638 return FALSE;
dc810e39 639 if (bfd_bread (name, (bfd_size_type) symlength, abfd) != symlength)
b34976b6 640 return FALSE;
252b5132
RH		 641 name[symlength] = '\0';
642 sym -> symbol.name = name;
643 sym -> symbol.flags = 0;
644 sym -> symbol.value = 0;
645 sym -> symbol.section = bfd_und_section_ptr;
dc810e39
AM		 646 if (bfd_bread ((PTR) temp, (bfd_size_type) sizeof (temp), abfd)
647 != sizeof (temp))
b34976b6 648 return FALSE;
dc810e39
AM		 649 rcount = H_GET_32 (abfd, temp);
650 amt = rcount * sizeof (struct nlm_relent);
651 nlm_relocs = (struct nlm_relent *) bfd_alloc (abfd, amt);
252b5132 652 if (!nlm_relocs)
b34976b6 653 return FALSE;
252b5132
RH		 654 sym -> relocs = nlm_relocs;
655 sym -> rcnt = 0;
656 while (sym -> rcnt < rcount)
657 {
658 asection *section;
1518639e 659
82e51918 660 if (! nlm_alpha_read_reloc (abfd, sym, &section, &nlm_relocs -> reloc))
b34976b6 661 return FALSE;
252b5132
RH		 662 nlm_relocs -> section = section;
663 nlm_relocs++;
664 sym -> rcnt++;
665 }
666
b34976b6 667 return TRUE;
252b5132
RH		 668}
669
670/* Write an Alpha NLM reloc. */
671
b34976b6 672static bfd_boolean
252b5132
RH		 673nlm_alpha_write_import (abfd, sec, rel)
674 bfd *abfd;
675 asection *sec;
676 arelent *rel;
677{
678 asymbol *sym;
679 bfd_vma r_vaddr;
680 long r_symndx;
681 int r_type, r_extern, r_offset, r_size;
682 struct nlm32_alpha_external_reloc ext;
683
684 sym = *rel->sym_ptr_ptr;
685
686 /* Get values for the relocation fields. */
687 r_type = rel->howto->type;
688 if (r_type != ALPHA_R_NW_RELOC)
689 {
690 r_vaddr = bfd_get_section_vma (abfd, sec) + rel->address;
691 if ((sec->flags & SEC_CODE) == 0)
692 r_vaddr += bfd_section_size (abfd,
693 bfd_get_section_by_name (abfd,
694 NLM_CODE_NAME));
695 if (bfd_is_und_section (bfd_get_section (sym)))
696 {
697 r_extern = 1;
698 r_symndx = 0;
699 }
700 else
701 {
702 r_extern = 0;
703 if (bfd_get_section_flags (abfd, bfd_get_section (sym)) & SEC_CODE)
704 r_symndx = ALPHA_RELOC_SECTION_TEXT;
705 else
706 r_symndx = ALPHA_RELOC_SECTION_DATA;
707 }
708 r_offset = 0;
709 r_size = 0;
710
711 switch (r_type)
712 {
713 case ALPHA_R_LITUSE:
714 case ALPHA_R_GPDISP:
715 r_symndx = rel->addend;
716 break;
717
718 case ALPHA_R_OP_STORE:
719 r_size = rel->addend & 0xff;
720 r_offset = (rel->addend >> 8) & 0xff;
721 break;
722
723 case ALPHA_R_OP_PUSH:
724 case ALPHA_R_OP_PSUB:
725 case ALPHA_R_OP_PRSHIFT:
726 r_vaddr = rel->addend;
727 break;
728
729 case ALPHA_R_IGNORE:
730 r_vaddr = rel->address;
731 break;
732
733 default:
734 break;
735 }
736 }
737 else
738 {
739 /* r_type == ALPHA_R_NW_RELOC */
740 r_vaddr = rel->address;
741 if (rel->addend == 0)
742 {
743 r_symndx = 0;
744 r_size = ALPHA_R_NW_RELOC_SETGP;
745 }
746 else
747 {
748 r_symndx = rel->addend - 1;
749 r_size = ALPHA_R_NW_RELOC_LITA;
750 }
751 r_extern = 0;
752 r_offset = 0;
753 }
754
755 /* Swap out the relocation fields. */
dc810e39
AM		 756 H_PUT_64 (abfd, r_vaddr, ext.r_vaddr);
757 H_PUT_32 (abfd, r_symndx, ext.r_symndx);
252b5132
RH		 758
759 BFD_ASSERT (bfd_little_endian (abfd));
760
761 ext.r_bits[0] = ((r_type << RELOC_BITS0_TYPE_SH_LITTLE)
762 & RELOC_BITS0_TYPE_LITTLE);
763 ext.r_bits[1] = ((r_extern ? RELOC_BITS1_EXTERN_LITTLE : 0)
764 | ((r_offset << RELOC_BITS1_OFFSET_SH_LITTLE)
765 & RELOC_BITS1_OFFSET_LITTLE));
766 ext.r_bits[2] = 0;
767 ext.r_bits[3] = ((r_size << RELOC_BITS3_SIZE_SH_LITTLE)
768 & RELOC_BITS3_SIZE_LITTLE);
769
770 /* Write out the relocation. */
dc810e39 771 if (bfd_bwrite (&ext, (bfd_size_type) sizeof ext, abfd) != sizeof ext)
b34976b6 772 return FALSE;
252b5132 773
b34976b6 774 return TRUE;
252b5132
RH		 775}
776\f
777/* Alpha NetWare does not use the high bit to determine whether a
778 public symbol is in the code segment or the data segment. Instead,
779 it just uses the address. The set_public_section and
780 get_public_offset routines override the default code which uses the
781 high bit. */
782
783/* Set the section for a public symbol. */
784
b34976b6 785static bfd_boolean
252b5132
RH		 786nlm_alpha_set_public_section (abfd, sym)
787 bfd *abfd;
788 nlmNAME(symbol_type) *sym;
789{
790 asection *code_sec, *data_sec;
791
792 code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
793 data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
794 if (sym->symbol.value < bfd_section_size (abfd, code_sec))
795 {
796 sym->symbol.section = code_sec;
797 sym->symbol.flags |= BSF_FUNCTION;
798 }
799 else
800 {
801 sym->symbol.section = data_sec;
802 sym->symbol.value -= bfd_section_size (abfd, code_sec);
803 /* The data segment had better be aligned. */
804 BFD_ASSERT ((bfd_section_size (abfd, code_sec) & 0xf) == 0);
805 }
b34976b6 806 return TRUE;
252b5132
RH		 807}
808
809/* Get the offset to write out for a public symbol. */
810
811static bfd_vma
812nlm_alpha_get_public_offset (abfd, sym)
56fc028e 813 bfd *abfd ATTRIBUTE_UNUSED;
252b5132
RH		 814 asymbol *sym;
815{
816 return bfd_asymbol_value (sym);
817}
818\f
819/* Write an Alpha NLM external symbol. */
820
b34976b6 821static bfd_boolean
252b5132
RH		 822nlm_alpha_write_external (abfd, count, sym, relocs)
823 bfd *abfd;
824 bfd_size_type count;
825 asymbol *sym;
826 struct reloc_and_sec *relocs;
827{
5d964dfa 828 bfd_size_type i;
252b5132
RH		 829 bfd_byte len;
830 unsigned char temp[NLM_TARGET_LONG_SIZE];
831 arelent r;
832
833 len = strlen (sym->name);
dc810e39
AM		 834 if ((bfd_bwrite (&len, (bfd_size_type) sizeof (bfd_byte), abfd)
835 != sizeof (bfd_byte))
836 || bfd_bwrite (sym->name, (bfd_size_type) len, abfd) != len)
b34976b6 837 return FALSE;
252b5132
RH		 838
839 bfd_put_32 (abfd, count + 2, temp);
dc810e39 840 if (bfd_bwrite (temp, (bfd_size_type) sizeof (temp), abfd) != sizeof (temp))
b34976b6 841 return FALSE;
252b5132
RH		 842
843 /* The first two relocs for each external symbol are the .lita
844 address and the GP value. */
845 r.sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
846 r.howto = &nlm32_alpha_nw_howto;
847
848 r.address = nlm_alpha_backend_data (abfd)->lita_address;
849 r.addend = nlm_alpha_backend_data (abfd)->lita_size + 1;
82e51918 850 if (! nlm_alpha_write_import (abfd, (asection *) NULL, &r))
b34976b6 851 return FALSE;
252b5132
RH		 852
853 r.address = nlm_alpha_backend_data (abfd)->gp;
854 r.addend = 0;
82e51918 855 if (! nlm_alpha_write_import (abfd, (asection *) NULL, &r))
b34976b6 856 return FALSE;
252b5132
RH		 857
858 for (i = 0; i < count; i++)
859 {
82e51918 860 if (! nlm_alpha_write_import (abfd, relocs[i].sec, relocs[i].rel))
b34976b6 861 return FALSE;
252b5132
RH		 862 }
863
b34976b6 864 return TRUE;
252b5132
RH		 865}
866
867#include "nlmswap.h"
868
869static const struct nlm_backend_data nlm32_alpha_backend =
870{
871 "NetWare Alpha Module \032",
872 sizeof (Nlm32_alpha_External_Fixed_Header),
873 sizeof (struct nlm32_alpha_external_prefix_header),
874 bfd_arch_alpha,
875 0,
b34976b6 876 TRUE, /* no uninitialized data permitted by Alpha NetWare. */
252b5132
RH		 877 nlm_alpha_backend_object_p,
878 nlm_alpha_write_prefix,
879 nlm_alpha_read_reloc,
880 nlm_alpha_mangle_relocs,
881 nlm_alpha_read_import,
882 nlm_alpha_write_import,
883 nlm_alpha_set_public_section,
884 nlm_alpha_get_public_offset,
885 nlm_swap_fixed_header_in,
886 nlm_swap_fixed_header_out,
887 nlm_alpha_write_external,
888 0, /* write_export */
889};
890
891#define TARGET_LITTLE_NAME "nlm32-alpha"
892#define TARGET_LITTLE_SYM nlmNAME(alpha_vec)
893#define TARGET_BACKEND_DATA &nlm32_alpha_backend
894
895#include "nlm-target.h"
GDB Binutils - Deliverables
This page took 0.265471 seconds and 4 git commands to generate.