1 /* i370-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4 Written by Ian Lance Taylor, Cygnus Support.
5 Hacked by Linas Vepstas for i370 linas@linas.org
7 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
23 /* This file is based on a preliminary PowerPC ELF ABI.
24 But its been hacked on for the IBM 360/370 architectures.
25 Basically, the 31bit relocation works, and just about everything
26 else is a wild card. In particular, don't expect shared libs or
27 dynamic loading to work ... its never been tested ...
37 static reloc_howto_type *i370_elf_howto_table[ (int)R_I370_max ];
39 static reloc_howto_type i370_elf_howto_raw[] =
41 /* This reloc does nothing. */
42 HOWTO (R_I370_NONE, /* type */
44 2, /* size (0 = byte, 1 = short, 2 = long) */
46 FALSE, /* pc_relative */
48 complain_overflow_bitfield, /* complain_on_overflow */
49 bfd_elf_generic_reloc, /* special_function */
50 "R_I370_NONE", /* name */
51 FALSE, /* partial_inplace */
54 FALSE), /* pcrel_offset */
56 /* A standard 31 bit relocation. */
57 HOWTO (R_I370_ADDR31, /* type */
59 2, /* size (0 = byte, 1 = short, 2 = long) */
61 FALSE, /* pc_relative */
63 complain_overflow_bitfield, /* complain_on_overflow */
64 bfd_elf_generic_reloc, /* special_function */
65 "R_I370_ADDR31", /* name */
66 FALSE, /* partial_inplace */
68 0x7fffffff, /* dst_mask */
69 FALSE), /* pcrel_offset */
71 /* A standard 32 bit relocation. */
72 HOWTO (R_I370_ADDR32, /* type */
74 2, /* size (0 = byte, 1 = short, 2 = long) */
76 FALSE, /* pc_relative */
78 complain_overflow_bitfield, /* complain_on_overflow */
79 bfd_elf_generic_reloc, /* special_function */
80 "R_I370_ADDR32", /* name */
81 FALSE, /* partial_inplace */
83 0xffffffff, /* dst_mask */
84 FALSE), /* pcrel_offset */
86 /* A standard 16 bit relocation. */
87 HOWTO (R_I370_ADDR16, /* type */
89 1, /* size (0 = byte, 1 = short, 2 = long) */
91 FALSE, /* pc_relative */
93 complain_overflow_bitfield, /* complain_on_overflow */
94 bfd_elf_generic_reloc, /* special_function */
95 "R_I370_ADDR16", /* name */
96 FALSE, /* partial_inplace */
98 0xffff, /* dst_mask */
99 FALSE), /* pcrel_offset */
101 /* 31-bit PC relative */
102 HOWTO (R_I370_REL31, /* type */
104 2, /* size (0 = byte, 1 = short, 2 = long) */
106 TRUE, /* pc_relative */
108 complain_overflow_bitfield, /* complain_on_overflow */
109 bfd_elf_generic_reloc, /* special_function */
110 "R_I370_REL31", /* name */
111 FALSE, /* partial_inplace */
113 0x7fffffff, /* dst_mask */
114 TRUE), /* pcrel_offset */
116 /* 32-bit PC relative */
117 HOWTO (R_I370_REL32, /* type */
119 2, /* size (0 = byte, 1 = short, 2 = long) */
121 TRUE, /* pc_relative */
123 complain_overflow_bitfield, /* complain_on_overflow */
124 bfd_elf_generic_reloc, /* special_function */
125 "R_I370_REL32", /* name */
126 FALSE, /* partial_inplace */
128 0xffffffff, /* dst_mask */
129 TRUE), /* pcrel_offset */
131 /* A standard 12 bit relocation. */
132 HOWTO (R_I370_ADDR12, /* type */
134 1, /* size (0 = byte, 1 = short, 2 = long) */
136 FALSE, /* pc_relative */
138 complain_overflow_bitfield, /* complain_on_overflow */
139 bfd_elf_generic_reloc, /* special_function */
140 "R_I370_ADDR12", /* name */
141 FALSE, /* partial_inplace */
143 0xfff, /* dst_mask */
144 FALSE), /* pcrel_offset */
146 /* 12-bit PC relative */
147 HOWTO (R_I370_REL12, /* type */
149 1, /* size (0 = byte, 1 = short, 2 = long) */
151 TRUE, /* pc_relative */
153 complain_overflow_bitfield, /* complain_on_overflow */
154 bfd_elf_generic_reloc, /* special_function */
155 "R_I370_REL12", /* name */
156 FALSE, /* partial_inplace */
158 0xfff, /* dst_mask */
159 TRUE), /* pcrel_offset */
161 /* A standard 8 bit relocation. */
162 HOWTO (R_I370_ADDR8, /* type */
164 0, /* size (0 = byte, 1 = short, 2 = long) */
166 FALSE, /* pc_relative */
168 complain_overflow_bitfield, /* complain_on_overflow */
169 bfd_elf_generic_reloc, /* special_function */
170 "R_I370_ADDR8", /* name */
171 FALSE, /* partial_inplace */
174 FALSE), /* pcrel_offset */
176 /* 8-bit PC relative */
177 HOWTO (R_I370_REL8, /* type */
179 0, /* size (0 = byte, 1 = short, 2 = long) */
181 TRUE, /* pc_relative */
183 complain_overflow_bitfield, /* complain_on_overflow */
184 bfd_elf_generic_reloc, /* special_function */
185 "R_I370_REL8", /* name */
186 FALSE, /* partial_inplace */
189 TRUE), /* pcrel_offset */
191 /* This is used only by the dynamic linker. The symbol should exist
192 both in the object being run and in some shared library. The
193 dynamic linker copies the data addressed by the symbol from the
194 shared library into the object, because the object being
195 run has to have the data at some particular address. */
196 HOWTO (R_I370_COPY, /* type */
198 2, /* size (0 = byte, 1 = short, 2 = long) */
200 FALSE, /* pc_relative */
202 complain_overflow_bitfield, /* complain_on_overflow */
203 bfd_elf_generic_reloc, /* special_function */
204 "R_I370_COPY", /* name */
205 FALSE, /* partial_inplace */
208 FALSE), /* pcrel_offset */
210 /* Used only by the dynamic linker. When the object is run, this
211 longword is set to the load address of the object, plus the
213 HOWTO (R_I370_RELATIVE, /* type */
215 2, /* size (0 = byte, 1 = short, 2 = long) */
217 FALSE, /* pc_relative */
219 complain_overflow_bitfield, /* complain_on_overflow */
220 bfd_elf_generic_reloc, /* special_function */
221 "R_I370_RELATIVE", /* name */
222 FALSE, /* partial_inplace */
224 0xffffffff, /* dst_mask */
225 FALSE), /* pcrel_offset */
229 static void i370_elf_howto_init
231 static reloc_howto_type *i370_elf_reloc_type_lookup
232 PARAMS ((bfd *, bfd_reloc_code_real_type));
233 static void i370_elf_info_to_howto
234 PARAMS ((bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst));
235 static bfd_boolean i370_elf_set_private_flags
236 PARAMS ((bfd *, flagword));
238 /* Initialize the i370_elf_howto_table, so that linear accesses can be done. */
241 i370_elf_howto_init ()
243 unsigned int i, type;
245 for (i = 0; i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]); i++)
247 type = i370_elf_howto_raw[i].type;
248 BFD_ASSERT (type < sizeof (i370_elf_howto_table) / sizeof (i370_elf_howto_table[0]));
249 i370_elf_howto_table[type] = &i370_elf_howto_raw[i];
253 static reloc_howto_type *
254 i370_elf_reloc_type_lookup (abfd, code)
255 bfd *abfd ATTRIBUTE_UNUSED;
256 bfd_reloc_code_real_type code;
258 enum i370_reloc_type i370_reloc = R_I370_NONE;
260 if (!i370_elf_howto_table[ R_I370_ADDR31 ]) /* Initialize howto table if needed */
261 i370_elf_howto_init ();
266 return (reloc_howto_type *)NULL;
268 case BFD_RELOC_NONE: i370_reloc = R_I370_NONE; break;
269 case BFD_RELOC_32: i370_reloc = R_I370_ADDR31; break;
270 case BFD_RELOC_16: i370_reloc = R_I370_ADDR16; break;
271 case BFD_RELOC_32_PCREL: i370_reloc = R_I370_REL31; break;
272 case BFD_RELOC_CTOR: i370_reloc = R_I370_ADDR31; break;
273 case BFD_RELOC_I370_D12: i370_reloc = R_I370_ADDR12; break;
276 return i370_elf_howto_table[ (int)i370_reloc ];
279 static bfd_boolean i370_elf_merge_private_bfd_data
280 PARAMS ((bfd *, bfd *));
281 static bfd_boolean i370_elf_relocate_section
282 PARAMS ((bfd *, struct bfd_link_info *info, bfd *, asection *, bfd_byte *,
283 Elf_Internal_Rela *relocs, Elf_Internal_Sym *local_syms,
285 static void i370_elf_post_process_headers
286 PARAMS ((bfd *, struct bfd_link_info *));
287 static bfd_boolean i370_elf_create_dynamic_sections
288 PARAMS ((bfd *, struct bfd_link_info *));
289 static bfd_boolean i370_elf_section_from_shdr
290 PARAMS ((bfd *, Elf_Internal_Shdr *, const char *));
291 static bfd_boolean i370_elf_fake_sections
292 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
293 static bfd_boolean i370_elf_check_relocs
294 PARAMS ((bfd *, struct bfd_link_info *, asection *,
295 const Elf_Internal_Rela *));
296 static bfd_boolean i370_elf_adjust_dynamic_symbol
297 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
298 static bfd_boolean i370_elf_adjust_dynindx
299 PARAMS ((struct elf_link_hash_entry *, PTR));
300 static bfd_boolean i370_elf_size_dynamic_sections
301 PARAMS ((bfd *, struct bfd_link_info *));
302 static bfd_boolean i370_elf_finish_dynamic_sections
303 PARAMS ((bfd *, struct bfd_link_info *));
305 /* The name of the dynamic interpreter. This is put in the .interp
308 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
310 /* Set the howto pointer for an i370 ELF reloc. */
313 i370_elf_info_to_howto (abfd, cache_ptr, dst)
314 bfd *abfd ATTRIBUTE_UNUSED;
316 Elf_Internal_Rela *dst;
318 if (!i370_elf_howto_table[ R_I370_ADDR31 ]) /* Initialize howto table */
319 i370_elf_howto_init ();
321 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max);
322 cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
325 /* hack alert -- the following several routines look generic to me ...
326 * why are we bothering with them ???
328 /* Function to set whether a module needs the -mrelocatable bit set. */
330 i370_elf_set_private_flags (abfd, flags)
334 BFD_ASSERT (!elf_flags_init (abfd)
335 || elf_elfheader (abfd)->e_flags == flags);
337 elf_elfheader (abfd)->e_flags = flags;
338 elf_flags_init (abfd) = TRUE;
342 /* Merge backend specific data from an object file to the output
343 object file when linking */
345 i370_elf_merge_private_bfd_data (ibfd, obfd)
352 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
353 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
356 new_flags = elf_elfheader (ibfd)->e_flags;
357 old_flags = elf_elfheader (obfd)->e_flags;
358 if (!elf_flags_init (obfd)) /* First call, no flags set */
360 elf_flags_init (obfd) = TRUE;
361 elf_elfheader (obfd)->e_flags = new_flags;
364 else if (new_flags == old_flags) /* Compatible flags are ok */
367 else /* Incompatible flags */
369 (*_bfd_error_handler)
370 ("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
371 bfd_archive_filename (ibfd), (long) new_flags, (long) old_flags);
373 bfd_set_error (bfd_error_bad_value);
380 /* Handle an i370 specific section when reading an object file. This
381 is called when elfcode.h finds a section with an unknown type. */
382 /* XXX hack alert bogus This routine is mostly all junk and almost
383 * certainly does the wrong thing. Its here simply because it does
384 * just enough to allow glibc-2.1 ld.so to compile & link.
388 i370_elf_section_from_shdr (abfd, hdr, name)
390 Elf_Internal_Shdr *hdr;
396 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name))
399 newsect = hdr->bfd_section;
400 flags = bfd_get_section_flags (abfd, newsect);
401 if (hdr->sh_flags & SHF_EXCLUDE)
402 flags |= SEC_EXCLUDE;
404 if (hdr->sh_type == SHT_ORDERED)
405 flags |= SEC_SORT_ENTRIES;
407 bfd_set_section_flags (abfd, newsect, flags);
411 /* Set up any other section flags and such that may be necessary. */
412 /* XXX hack alert bogus This routine is mostly all junk and almost
413 * certainly does the wrong thing. Its here simply because it does
414 * just enough to allow glibc-2.1 ld.so to compile & link.
418 i370_elf_fake_sections (abfd, shdr, asect)
419 bfd *abfd ATTRIBUTE_UNUSED;
420 Elf_Internal_Shdr *shdr;
423 if ((asect->flags & SEC_EXCLUDE) != 0)
424 shdr->sh_flags |= SHF_EXCLUDE;
426 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
427 shdr->sh_type = SHT_ORDERED;
432 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
433 to output sections (just like _bfd_elf_create_dynamic_sections has
434 to create .dynbss and .rela.bss). */
435 /* XXX hack alert bogus This routine is mostly all junk and almost
436 * certainly does the wrong thing. Its here simply because it does
437 * just enough to allow glibc-2.1 ld.so to compile & link.
441 i370_elf_create_dynamic_sections (abfd, info)
443 struct bfd_link_info *info;
445 register asection *s;
448 if (!_bfd_elf_create_dynamic_sections(abfd, info))
451 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
452 | SEC_LINKER_CREATED);
454 s = bfd_make_section (abfd, ".dynsbss");
456 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
461 s = bfd_make_section (abfd, ".rela.sbss");
463 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
464 || ! bfd_set_section_alignment (abfd, s, 2))
468 /* xxx beats me, seem to need a rela.text ... */
469 s = bfd_make_section (abfd, ".rela.text");
471 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
472 || ! bfd_set_section_alignment (abfd, s, 2))
477 /* Adjust a symbol defined by a dynamic object and referenced by a
478 regular object. The current definition is in some section of the
479 dynamic object, but we're not including those sections. We have to
480 change the definition to something the rest of the link can
482 /* XXX hack alert bogus This routine is mostly all junk and almost
483 * certainly does the wrong thing. Its here simply because it does
484 * just enough to allow glibc-2.1 ld.so to compile & link.
488 i370_elf_adjust_dynamic_symbol (info, h)
489 struct bfd_link_info *info;
490 struct elf_link_hash_entry *h;
492 bfd *dynobj = elf_hash_table (info)->dynobj;
494 unsigned int power_of_two;
497 fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n",
498 h->root.root.string);
501 /* Make sure we know what is going on here. */
502 BFD_ASSERT (dynobj != NULL
503 && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
504 || h->weakdef != NULL
505 || ((h->elf_link_hash_flags
506 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
507 && (h->elf_link_hash_flags
508 & ELF_LINK_HASH_REF_REGULAR) != 0
509 && (h->elf_link_hash_flags
510 & ELF_LINK_HASH_DEF_REGULAR) == 0)));
512 s = bfd_get_section_by_name (dynobj, ".rela.text");
513 BFD_ASSERT (s != NULL);
514 s->_raw_size += sizeof (Elf32_External_Rela);
516 /* If this is a weak symbol, and there is a real definition, the
517 processor independent code will have arranged for us to see the
518 real definition first, and we can just use the same value. */
519 if (h->weakdef != NULL)
521 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
522 || h->weakdef->root.type == bfd_link_hash_defweak);
523 h->root.u.def.section = h->weakdef->root.u.def.section;
524 h->root.u.def.value = h->weakdef->root.u.def.value;
528 /* This is a reference to a symbol defined by a dynamic object which
529 is not a function. */
531 /* If we are creating a shared library, we must presume that the
532 only references to the symbol are via the global offset table.
533 For such cases we need not do anything here; the relocations will
534 be handled correctly by relocate_section. */
538 /* We must allocate the symbol in our .dynbss section, which will
539 become part of the .bss section of the executable. There will be
540 an entry for this symbol in the .dynsym section. The dynamic
541 object will contain position independent code, so all references
542 from the dynamic object to this symbol will go through the global
543 offset table. The dynamic linker will use the .dynsym entry to
544 determine the address it must put in the global offset table, so
545 both the dynamic object and the regular object will refer to the
546 same memory location for the variable.
548 Of course, if the symbol is sufficiently small, we must instead
549 allocate it in .sbss. FIXME: It would be better to do this if and
550 only if there were actually SDAREL relocs for that symbol. */
552 if (h->size <= elf_gp_size (dynobj))
553 s = bfd_get_section_by_name (dynobj, ".dynsbss");
555 s = bfd_get_section_by_name (dynobj, ".dynbss");
556 BFD_ASSERT (s != NULL);
558 /* We must generate a R_I370_COPY reloc to tell the dynamic linker to
559 copy the initial value out of the dynamic object and into the
560 runtime process image. We need to remember the offset into the
561 .rela.bss section we are going to use. */
562 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
566 if (h->size <= elf_gp_size (dynobj))
567 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
569 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
570 BFD_ASSERT (srel != NULL);
571 srel->_raw_size += sizeof (Elf32_External_Rela);
572 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
575 /* We need to figure out the alignment required for this symbol. I
576 have no idea how ELF linkers handle this. */
577 power_of_two = bfd_log2 (h->size);
578 if (power_of_two > 4)
581 /* Apply the required alignment. */
582 s->_raw_size = BFD_ALIGN (s->_raw_size,
583 (bfd_size_type) (1 << power_of_two));
584 if (power_of_two > bfd_get_section_alignment (dynobj, s))
586 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
590 /* Define the symbol as being at this point in the section. */
591 h->root.u.def.section = s;
592 h->root.u.def.value = s->_raw_size;
594 /* Increment the section size to make room for the symbol. */
595 s->_raw_size += h->size;
600 /* Increment the index of a dynamic symbol by a given amount. Called
601 via elf_link_hash_traverse. */
602 /* XXX hack alert bogus This routine is mostly all junk and almost
603 * certainly does the wrong thing. Its here simply because it does
604 * just enough to allow glibc-2.1 ld.so to compile & link.
608 i370_elf_adjust_dynindx (h, cparg)
609 struct elf_link_hash_entry *h;
612 int *cp = (int *) cparg;
616 "i370_elf_adjust_dynindx called, h->dynindx = %d, *cp = %d\n",
620 if (h->root.type == bfd_link_hash_warning)
621 h = (struct elf_link_hash_entry *) h->root.u.i.link;
623 if (h->dynindx != -1)
629 /* Set the sizes of the dynamic sections. */
630 /* XXX hack alert bogus This routine is mostly all junk and almost
631 * certainly does the wrong thing. Its here simply because it does
632 * just enough to allow glibc-2.1 ld.so to compile & link.
636 i370_elf_size_dynamic_sections (output_bfd, info)
638 struct bfd_link_info *info;
647 fprintf (stderr, "i370_elf_size_dynamic_sections called\n");
650 dynobj = elf_hash_table (info)->dynobj;
651 BFD_ASSERT (dynobj != NULL);
653 if (elf_hash_table (info)->dynamic_sections_created)
655 /* Set the contents of the .interp section to the interpreter. */
656 if (info->executable)
658 s = bfd_get_section_by_name (dynobj, ".interp");
659 BFD_ASSERT (s != NULL);
660 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
661 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
666 /* We may have created entries in the .rela.got, .rela.sdata, and
667 .rela.sdata2 sections. However, if we are not creating the
668 dynamic sections, we will not actually use these entries. Reset
669 the size of .rela.got, et al, which will cause it to get
670 stripped from the output file below. */
671 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
672 ".rela.sdata2", ".rela.sbss",
676 for (p = rela_sections; *p != (char *)0; p++)
678 s = bfd_get_section_by_name (dynobj, *p);
684 /* The check_relocs and adjust_dynamic_symbol entry points have
685 determined the sizes of the various dynamic sections. Allocate
690 for (s = dynobj->sections; s != NULL; s = s->next)
695 if ((s->flags & SEC_LINKER_CREATED) == 0)
698 /* It's OK to base decisions on the section name, because none
699 of the dynobj section names depend upon the input files. */
700 name = bfd_get_section_name (dynobj, s);
703 if (strcmp (name, ".plt") == 0)
705 if (s->_raw_size == 0)
707 /* Strip this section if we don't need it; see the
713 /* Remember whether there is a PLT. */
717 else if (strncmp (name, ".rela", 5) == 0)
719 if (s->_raw_size == 0)
721 /* If we don't need this section, strip it from the
722 output file. This is mostly to handle .rela.bss and
723 .rela.plt. We must create both sections in
724 create_dynamic_sections, because they must be created
725 before the linker maps input sections to output
726 sections. The linker does that before
727 adjust_dynamic_symbol is called, and it is that
728 function which decides whether anything needs to go
729 into these sections. */
737 /* Remember whether there are any relocation sections. */
740 /* If this relocation section applies to a read only
741 section, then we probably need a DT_TEXTREL entry. */
742 outname = bfd_get_section_name (output_bfd,
744 target = bfd_get_section_by_name (output_bfd, outname + 5);
746 && (target->flags & SEC_READONLY) != 0
747 && (target->flags & SEC_ALLOC) != 0)
750 /* We use the reloc_count field as a counter if we need
751 to copy relocs into the output file. */
755 else if (strcmp (name, ".got") != 0
756 && strcmp (name, ".sdata") != 0
757 && strcmp (name, ".sdata2") != 0)
759 /* It's not one of our sections, so don't allocate space. */
767 for (spp = &s->output_section->owner->sections;
771 if (*spp == s->output_section)
773 bfd_section_list_remove (s->output_section->owner, spp);
774 --s->output_section->owner->section_count;
780 /* Allocate memory for the section contents. */
781 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size);
782 if (s->contents == NULL && s->_raw_size != 0)
786 if (elf_hash_table (info)->dynamic_sections_created)
788 /* Add some entries to the .dynamic section. We fill in the
789 values later, in i370_elf_finish_dynamic_sections, but we
790 must add the entries now so that we get the correct size for
791 the .dynamic section. The DT_DEBUG entry is filled in by the
792 dynamic linker and used by the debugger. */
793 #define add_dynamic_entry(TAG, VAL) \
794 bfd_elf32_add_dynamic_entry (info, (bfd_vma) (TAG), (bfd_vma) (VAL))
798 if (!add_dynamic_entry (DT_DEBUG, 0))
804 if (!add_dynamic_entry (DT_PLTGOT, 0)
805 || !add_dynamic_entry (DT_PLTRELSZ, 0)
806 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
807 || !add_dynamic_entry (DT_JMPREL, 0))
813 if (!add_dynamic_entry (DT_RELA, 0)
814 || !add_dynamic_entry (DT_RELASZ, 0)
815 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
821 if (!add_dynamic_entry (DT_TEXTREL, 0))
823 info->flags |= DF_TEXTREL;
826 #undef add_dynamic_entry
828 /* If we are generating a shared library, we generate a section
829 symbol for each output section. These are local symbols, which
830 means that they must come first in the dynamic symbol table.
831 That means we must increment the dynamic symbol index of every
832 other dynamic symbol.
834 FIXME: We assume that there will never be relocations to
835 locations in linker-created sections that do not have
836 externally-visible names. Instead, we should work out precisely
837 which sections relocations are targeted at. */
842 for (c = 0, s = output_bfd->sections; s != NULL; s = s->next)
844 if ((s->flags & SEC_LINKER_CREATED) != 0
845 || (s->flags & SEC_ALLOC) == 0)
847 elf_section_data (s)->dynindx = -1;
851 /* These symbols will have no names, so we don't need to
852 fiddle with dynstr_index. */
854 elf_section_data (s)->dynindx = c + 1;
859 elf_link_hash_traverse (elf_hash_table (info),
860 i370_elf_adjust_dynindx,
862 elf_hash_table (info)->dynsymcount += c;
868 /* Look through the relocs for a section during the first phase, and
869 allocate space in the global offset table or procedure linkage
871 /* XXX hack alert bogus This routine is mostly all junk and almost
872 * certainly does the wrong thing. Its here simply because it does
873 * just enough to allow glibc-2.1 ld.so to compile & link.
877 i370_elf_check_relocs (abfd, info, sec, relocs)
879 struct bfd_link_info *info;
881 const Elf_Internal_Rela *relocs;
884 Elf_Internal_Shdr *symtab_hdr;
885 struct elf_link_hash_entry **sym_hashes;
886 const Elf_Internal_Rela *rel;
887 const Elf_Internal_Rela *rel_end;
888 bfd_vma *local_got_offsets;
891 if (info->relocatable)
895 fprintf (stderr, "i370_elf_check_relocs called for section %s in %s\n",
896 bfd_get_section_name (abfd, sec),
897 bfd_archive_filename (abfd));
900 dynobj = elf_hash_table (info)->dynobj;
901 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
902 sym_hashes = elf_sym_hashes (abfd);
903 local_got_offsets = elf_local_got_offsets (abfd);
907 rel_end = relocs + sec->reloc_count;
908 for (rel = relocs; rel < rel_end; rel++)
910 unsigned long r_symndx;
911 struct elf_link_hash_entry *h;
913 r_symndx = ELF32_R_SYM (rel->r_info);
914 if (r_symndx < symtab_hdr->sh_info)
917 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
923 "i370_elf_check_relocs needs to create relocation for %s\n",
924 (h && h->root.root.string)
925 ? h->root.root.string : "<unknown>");
931 name = (bfd_elf_string_from_elf_section
933 elf_elfheader (abfd)->e_shstrndx,
934 elf_section_data (sec)->rel_hdr.sh_name));
938 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
939 && strcmp (bfd_get_section_name (abfd, sec), name + 5) == 0);
941 sreloc = bfd_get_section_by_name (dynobj, name);
946 sreloc = bfd_make_section (dynobj, name);
947 flags = (SEC_HAS_CONTENTS | SEC_READONLY
948 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
949 if ((sec->flags & SEC_ALLOC) != 0)
950 flags |= SEC_ALLOC | SEC_LOAD;
952 || ! bfd_set_section_flags (dynobj, sreloc, flags)
953 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
958 sreloc->_raw_size += sizeof (Elf32_External_Rela);
960 /* FIXME: We should here do what the m68k and i386
961 backends do: if the reloc is pc-relative, record it
962 in case it turns out that the reloc is unnecessary
963 because the symbol is forced local by versioning or
964 we are linking with -Bdynamic. Fortunately this
965 case is not frequent. */
972 /* Finish up the dynamic sections. */
973 /* XXX hack alert bogus This routine is mostly all junk and almost
974 * certainly does the wrong thing. Its here simply because it does
975 * just enough to allow glibc-2.1 ld.so to compile & link.
979 i370_elf_finish_dynamic_sections (output_bfd, info)
981 struct bfd_link_info *info;
984 bfd *dynobj = elf_hash_table (info)->dynobj;
985 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
988 fprintf (stderr, "i370_elf_finish_dynamic_sections called\n");
991 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
993 if (elf_hash_table (info)->dynamic_sections_created)
996 Elf32_External_Dyn *dyncon, *dynconend;
998 splt = bfd_get_section_by_name (dynobj, ".plt");
999 BFD_ASSERT (splt != NULL && sdyn != NULL);
1001 dyncon = (Elf32_External_Dyn *) sdyn->contents;
1002 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
1003 for (; dyncon < dynconend; dyncon++)
1005 Elf_Internal_Dyn dyn;
1009 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1013 case DT_PLTGOT: name = ".plt"; size = FALSE; break;
1014 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
1015 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
1016 default: name = NULL; size = FALSE; break;
1023 s = bfd_get_section_by_name (output_bfd, name);
1029 dyn.d_un.d_ptr = s->vma;
1032 if (s->_cooked_size != 0)
1033 dyn.d_un.d_val = s->_cooked_size;
1035 dyn.d_un.d_val = s->_raw_size;
1038 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1043 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
1044 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
1045 /* XXX this is clearly very wrong for the 370 arch */
1048 unsigned char *contents = sgot->contents;
1049 bfd_put_32 (output_bfd, (bfd_vma) 0x4e800021 /* blrl */, contents);
1052 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
1054 bfd_put_32 (output_bfd,
1055 sdyn->output_section->vma + sdyn->output_offset,
1058 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1065 Elf_Internal_Sym sym;
1068 /* Set up the section symbols for the output sections. */
1070 sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
1071 BFD_ASSERT (sdynsym != NULL);
1075 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
1078 for (s = output_bfd->sections; s != NULL; s = s->next)
1081 Elf32_External_Sym *esym;
1083 sym.st_value = s->vma;
1085 indx = elf_section_data (s)->this_idx;
1086 dindx = elf_section_data (s)->dynindx;
1089 BFD_ASSERT(indx > 0);
1090 BFD_ASSERT(dindx > 0);
1092 if (dindx > maxdindx)
1095 sym.st_shndx = indx;
1097 esym = (Elf32_External_Sym *) sdynsym->contents + dindx;
1098 bfd_elf32_swap_symbol_out (output_bfd, &sym, (PTR) esym, (PTR) 0);
1102 /* Set the sh_info field of the output .dynsym section to the
1103 index of the first global symbol. */
1104 elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
1111 /* The RELOCATE_SECTION function is called by the ELF backend linker
1112 to handle the relocations for a section.
1114 The relocs are always passed as Rela structures; if the section
1115 actually uses Rel structures, the r_addend field will always be
1118 This function is responsible for adjust the section contents as
1119 necessary, and (if using Rela relocs and generating a
1120 relocatable output file) adjusting the reloc addend as
1123 This function does not have to worry about setting the reloc
1124 address or the reloc symbol index.
1126 LOCAL_SYMS is a pointer to the swapped in local symbols.
1128 LOCAL_SECTIONS is an array giving the section in the input file
1129 corresponding to the st_shndx field of each local symbol.
1131 The global hash table entry for the global symbols can be found
1132 via elf_sym_hashes (input_bfd).
1134 When generating relocatable output, this function must handle
1135 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1136 going to be the section symbol corresponding to the output
1137 section, which means that the addend must be adjusted
1141 i370_elf_relocate_section (output_bfd, info, input_bfd, input_section,
1142 contents, relocs, local_syms, local_sections)
1144 struct bfd_link_info *info;
1146 asection *input_section;
1148 Elf_Internal_Rela *relocs;
1149 Elf_Internal_Sym *local_syms;
1150 asection **local_sections;
1152 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1153 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
1154 bfd *dynobj = elf_hash_table (info)->dynobj;
1155 Elf_Internal_Rela *rel = relocs;
1156 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
1157 asection *sreloc = NULL;
1158 bfd_vma *local_got_offsets;
1159 bfd_boolean ret = TRUE;
1161 if (info->relocatable)
1165 fprintf (stderr, "i370_elf_relocate_section called for %s section %s, %ld relocations%s\n",
1166 bfd_archive_filename (input_bfd),
1167 bfd_section_name(input_bfd, input_section),
1168 (long) input_section->reloc_count,
1169 (info->relocatable) ? " (relocatable)" : "");
1172 if (!i370_elf_howto_table[ R_I370_ADDR31 ]) /* Initialize howto table if needed */
1173 i370_elf_howto_init ();
1175 local_got_offsets = elf_local_got_offsets (input_bfd);
1177 for (; rel < relend; rel++)
1179 enum i370_reloc_type r_type = (enum i370_reloc_type)ELF32_R_TYPE (rel->r_info);
1180 bfd_vma offset = rel->r_offset;
1181 bfd_vma addend = rel->r_addend;
1182 bfd_reloc_status_type r = bfd_reloc_other;
1183 Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
1184 asection *sec = (asection *)0;
1185 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
1186 const char *sym_name = (const char *)0;
1187 reloc_howto_type *howto;
1188 unsigned long r_symndx;
1191 /* Unknown relocation handling */
1192 if ((unsigned)r_type >= (unsigned)R_I370_max
1193 || !i370_elf_howto_table[(int)r_type])
1195 (*_bfd_error_handler) ("%s: unknown relocation type %d",
1196 bfd_archive_filename (input_bfd),
1199 bfd_set_error (bfd_error_bad_value);
1204 howto = i370_elf_howto_table[(int)r_type];
1205 r_symndx = ELF32_R_SYM (rel->r_info);
1207 if (r_symndx < symtab_hdr->sh_info)
1209 sym = local_syms + r_symndx;
1210 sec = local_sections[r_symndx];
1211 sym_name = "<local symbol>";
1213 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1214 addend = rel->r_addend;
1218 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1219 while (h->root.type == bfd_link_hash_indirect
1220 || h->root.type == bfd_link_hash_warning)
1221 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1222 sym_name = h->root.root.string;
1223 if (h->root.type == bfd_link_hash_defined
1224 || h->root.type == bfd_link_hash_defweak)
1226 sec = h->root.u.def.section;
1228 && ((! info->symbolic && h->dynindx != -1)
1229 || (h->elf_link_hash_flags
1230 & ELF_LINK_HASH_DEF_REGULAR) == 0)
1231 && (input_section->flags & SEC_ALLOC) != 0
1232 && (r_type == R_I370_ADDR31
1233 || r_type == R_I370_COPY
1234 || r_type == R_I370_ADDR16
1235 || r_type == R_I370_RELATIVE))
1237 /* In these cases, we don't need the relocation
1238 value. We check specially because in some
1239 obscure cases sec->output_section will be NULL. */
1243 relocation = (h->root.u.def.value
1244 + sec->output_section->vma
1245 + sec->output_offset);
1247 else if (h->root.type == bfd_link_hash_undefweak)
1249 else if (info->shared
1250 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1254 (*info->callbacks->undefined_symbol) (info,
1255 h->root.root.string,
1265 switch ((int) r_type)
1268 (*_bfd_error_handler)
1269 ("%s: unknown relocation type %d for symbol %s",
1270 bfd_archive_filename (input_bfd),
1271 (int) r_type, sym_name);
1273 bfd_set_error (bfd_error_bad_value);
1277 case (int)R_I370_NONE:
1280 /* Relocations that may need to be propagated if this is a shared
1282 case (int)R_I370_REL31:
1283 /* If these relocations are not to a named symbol, they can be
1284 handled right here, no need to bother the dynamic linker. */
1286 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1290 /* Relocations that always need to be propagated if this is a shared
1292 case (int)R_I370_ADDR31:
1293 case (int)R_I370_ADDR16:
1297 Elf_Internal_Rela outrel;
1303 "i370_elf_relocate_section needs to create relocation for %s\n",
1304 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
1307 /* When generating a shared object, these relocations
1308 are copied into the output file to be resolved at run
1315 name = (bfd_elf_string_from_elf_section
1317 elf_elfheader (input_bfd)->e_shstrndx,
1318 elf_section_data (input_section)->rel_hdr.sh_name));
1322 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1323 && strcmp (bfd_get_section_name (input_bfd,
1327 sreloc = bfd_get_section_by_name (dynobj, name);
1328 BFD_ASSERT (sreloc != NULL);
1334 _bfd_elf_section_offset (output_bfd, info, input_section,
1336 if (outrel.r_offset == (bfd_vma) -1
1337 || outrel.r_offset == (bfd_vma) -2)
1338 skip = (int) outrel.r_offset;
1339 outrel.r_offset += (input_section->output_section->vma
1340 + input_section->output_offset);
1343 memset (&outrel, 0, sizeof outrel);
1344 /* h->dynindx may be -1 if this symbol was marked to
1347 && ((! info->symbolic && h->dynindx != -1)
1348 || (h->elf_link_hash_flags
1349 & ELF_LINK_HASH_DEF_REGULAR) == 0))
1351 BFD_ASSERT (h->dynindx != -1);
1352 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1353 outrel.r_addend = rel->r_addend;
1357 if (r_type == R_I370_ADDR31)
1359 outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE);
1360 outrel.r_addend = relocation + rel->r_addend;
1366 if (bfd_is_abs_section (sec))
1368 else if (sec == NULL || sec->owner == NULL)
1370 bfd_set_error (bfd_error_bad_value);
1377 osec = sec->output_section;
1378 indx = elf_section_data (osec)->dynindx;
1379 BFD_ASSERT(indx > 0);
1383 printf ("indx=%d section=%s flags=%08x name=%s\n",
1384 indx, osec->name, osec->flags,
1385 h->root.root.string);
1390 outrel.r_info = ELF32_R_INFO (indx, r_type);
1391 outrel.r_addend = relocation + rel->r_addend;
1395 loc = sreloc->contents;
1396 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1397 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1399 /* This reloc will be computed at runtime, so there's no
1400 need to do anything now, unless this is a RELATIVE
1401 reloc in an unallocated section. */
1403 || (input_section->flags & SEC_ALLOC) != 0
1404 || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE)
1409 case (int)R_I370_COPY:
1410 case (int)R_I370_RELATIVE:
1411 (*_bfd_error_handler)
1412 ("%s: Relocation %s is not yet supported for symbol %s.",
1413 bfd_archive_filename (input_bfd),
1414 i370_elf_howto_table[(int) r_type]->name,
1417 bfd_set_error (bfd_error_invalid_operation);
1423 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
1432 r = _bfd_final_link_relocate (howto,
1440 if (r != bfd_reloc_ok)
1448 case bfd_reloc_overflow:
1453 name = h->root.root.string;
1456 name = bfd_elf_string_from_elf_section (input_bfd,
1457 symtab_hdr->sh_link,
1463 name = bfd_section_name (input_bfd, sec);
1466 (*info->callbacks->reloc_overflow) (info,
1481 fprintf (stderr, "\n");
1488 i370_elf_post_process_headers (abfd, link_info)
1490 struct bfd_link_info * link_info ATTRIBUTE_UNUSED;
1492 Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */
1494 i_ehdrp = elf_elfheader (abfd);
1495 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_LINUX;
1498 #define TARGET_BIG_SYM bfd_elf32_i370_vec
1499 #define TARGET_BIG_NAME "elf32-i370"
1500 #define ELF_ARCH bfd_arch_i370
1501 #define ELF_MACHINE_CODE EM_S370
1503 #define ELF_MACHINE_ALT1 EM_I370_OLD
1505 #define ELF_MAXPAGESIZE 0x1000
1506 #define elf_info_to_howto i370_elf_info_to_howto
1508 #define elf_backend_plt_not_loaded 1
1509 #define elf_backend_got_symbol_offset 4
1510 #define elf_backend_rela_normal 1
1512 #define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup
1513 #define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags
1514 #define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data
1515 #define elf_backend_relocate_section i370_elf_relocate_section
1517 /* dynamic loader support is mostly broken; just enough here to be able to
1518 * link glibc's ld.so without errors.
1520 #define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections
1521 #define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections
1522 #define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections
1523 #define elf_backend_fake_sections i370_elf_fake_sections
1524 #define elf_backend_section_from_shdr i370_elf_section_from_shdr
1525 #define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol
1526 #define elf_backend_check_relocs i370_elf_check_relocs
1529 #define elf_backend_add_symbol_hook i370_elf_add_symbol_hook
1530 #define elf_backend_finish_dynamic_symbol i370_elf_finish_dynamic_symbol
1531 #define elf_backend_additional_program_headers i370_elf_additional_program_headers
1532 #define elf_backend_modify_segment_map i370_elf_modify_segment_map
1535 #define elf_backend_post_process_headers i370_elf_post_process_headers
1537 static int i370_noop
1540 static int i370_noop ()
1545 /* we need to define these at least as no-ops to link glibc ld.so */
1547 #define elf_backend_add_symbol_hook \
1549 PARAMS ((bfd *, struct bfd_link_info *, const Elf_Internal_Sym *, \
1550 const char **, flagword *, asection **, bfd_vma *))) i370_noop
1551 #define elf_backend_finish_dynamic_symbol \
1553 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \
1554 Elf_Internal_Sym *))) i370_noop
1555 #define elf_backend_additional_program_headers \
1556 (int (*) PARAMS ((bfd *))) i370_noop
1557 #define elf_backend_modify_segment_map \
1558 (bfd_boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) i370_noop
1560 #include "elf32-target.h"