1 /* i370-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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_fake_sections
290 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
291 static bfd_boolean i370_elf_check_relocs
292 PARAMS ((bfd *, struct bfd_link_info *, asection *,
293 const Elf_Internal_Rela *));
294 static bfd_boolean i370_elf_adjust_dynamic_symbol
295 PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
296 static bfd_boolean i370_elf_adjust_dynindx
297 PARAMS ((struct elf_link_hash_entry *, PTR));
298 static bfd_boolean i370_elf_size_dynamic_sections
299 PARAMS ((bfd *, struct bfd_link_info *));
300 static bfd_boolean i370_elf_finish_dynamic_sections
301 PARAMS ((bfd *, struct bfd_link_info *));
303 /* The name of the dynamic interpreter. This is put in the .interp
306 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
308 /* Set the howto pointer for an i370 ELF reloc. */
311 i370_elf_info_to_howto (abfd, cache_ptr, dst)
312 bfd *abfd ATTRIBUTE_UNUSED;
314 Elf_Internal_Rela *dst;
316 if (!i370_elf_howto_table[ R_I370_ADDR31 ]) /* Initialize howto table */
317 i370_elf_howto_init ();
319 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max);
320 cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
323 /* hack alert -- the following several routines look generic to me ...
324 * why are we bothering with them ???
326 /* Function to set whether a module needs the -mrelocatable bit set. */
328 i370_elf_set_private_flags (abfd, flags)
332 BFD_ASSERT (!elf_flags_init (abfd)
333 || elf_elfheader (abfd)->e_flags == flags);
335 elf_elfheader (abfd)->e_flags = flags;
336 elf_flags_init (abfd) = TRUE;
340 /* Merge backend specific data from an object file to the output
341 object file when linking */
343 i370_elf_merge_private_bfd_data (ibfd, obfd)
350 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
351 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
354 new_flags = elf_elfheader (ibfd)->e_flags;
355 old_flags = elf_elfheader (obfd)->e_flags;
356 if (!elf_flags_init (obfd)) /* First call, no flags set */
358 elf_flags_init (obfd) = TRUE;
359 elf_elfheader (obfd)->e_flags = new_flags;
362 else if (new_flags == old_flags) /* Compatible flags are ok */
365 else /* Incompatible flags */
367 (*_bfd_error_handler)
368 ("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
369 ibfd, (long) new_flags, (long) old_flags);
371 bfd_set_error (bfd_error_bad_value);
378 /* Handle an i370 specific section when reading an object file. This
379 is called when elfcode.h finds a section with an unknown type. */
380 /* XXX hack alert bogus This routine is mostly all junk and almost
381 * certainly does the wrong thing. Its here simply because it does
382 * just enough to allow glibc-2.1 ld.so to compile & link.
386 i370_elf_section_from_shdr (bfd *abfd,
387 Elf_Internal_Shdr *hdr,
394 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
397 newsect = hdr->bfd_section;
398 flags = bfd_get_section_flags (abfd, newsect);
399 if (hdr->sh_flags & SHF_EXCLUDE)
400 flags |= SEC_EXCLUDE;
402 if (hdr->sh_type == SHT_ORDERED)
403 flags |= SEC_SORT_ENTRIES;
405 bfd_set_section_flags (abfd, newsect, flags);
409 /* Set up any other section flags and such that may be necessary. */
410 /* XXX hack alert bogus This routine is mostly all junk and almost
411 * certainly does the wrong thing. Its here simply because it does
412 * just enough to allow glibc-2.1 ld.so to compile & link.
416 i370_elf_fake_sections (abfd, shdr, asect)
417 bfd *abfd ATTRIBUTE_UNUSED;
418 Elf_Internal_Shdr *shdr;
421 if ((asect->flags & SEC_EXCLUDE) != 0)
422 shdr->sh_flags |= SHF_EXCLUDE;
424 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
425 shdr->sh_type = SHT_ORDERED;
430 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
431 to output sections (just like _bfd_elf_create_dynamic_sections has
432 to create .dynbss and .rela.bss). */
433 /* XXX hack alert bogus This routine is mostly all junk and almost
434 * certainly does the wrong thing. Its here simply because it does
435 * just enough to allow glibc-2.1 ld.so to compile & link.
439 i370_elf_create_dynamic_sections (abfd, info)
441 struct bfd_link_info *info;
443 register asection *s;
446 if (!_bfd_elf_create_dynamic_sections(abfd, info))
449 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
450 | SEC_LINKER_CREATED);
452 s = bfd_make_section (abfd, ".dynsbss");
454 || ! bfd_set_section_flags (abfd, s, SEC_ALLOC))
459 s = bfd_make_section (abfd, ".rela.sbss");
461 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
462 || ! bfd_set_section_alignment (abfd, s, 2))
466 /* xxx beats me, seem to need a rela.text ... */
467 s = bfd_make_section (abfd, ".rela.text");
469 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
470 || ! bfd_set_section_alignment (abfd, s, 2))
475 /* Adjust a symbol defined by a dynamic object and referenced by a
476 regular object. The current definition is in some section of the
477 dynamic object, but we're not including those sections. We have to
478 change the definition to something the rest of the link can
480 /* XXX hack alert bogus This routine is mostly all junk and almost
481 * certainly does the wrong thing. Its here simply because it does
482 * just enough to allow glibc-2.1 ld.so to compile & link.
486 i370_elf_adjust_dynamic_symbol (info, h)
487 struct bfd_link_info *info;
488 struct elf_link_hash_entry *h;
490 bfd *dynobj = elf_hash_table (info)->dynobj;
492 unsigned int power_of_two;
495 fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n",
496 h->root.root.string);
499 /* Make sure we know what is going on here. */
500 BFD_ASSERT (dynobj != NULL
502 || h->u.weakdef != NULL
505 && !h->def_regular)));
507 s = bfd_get_section_by_name (dynobj, ".rela.text");
508 BFD_ASSERT (s != NULL);
509 s->size += sizeof (Elf32_External_Rela);
511 /* If this is a weak symbol, and there is a real definition, the
512 processor independent code will have arranged for us to see the
513 real definition first, and we can just use the same value. */
514 if (h->u.weakdef != NULL)
516 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
517 || h->u.weakdef->root.type == bfd_link_hash_defweak);
518 h->root.u.def.section = h->u.weakdef->root.u.def.section;
519 h->root.u.def.value = h->u.weakdef->root.u.def.value;
523 /* This is a reference to a symbol defined by a dynamic object which
524 is not a function. */
526 /* If we are creating a shared library, we must presume that the
527 only references to the symbol are via the global offset table.
528 For such cases we need not do anything here; the relocations will
529 be handled correctly by relocate_section. */
533 /* We must allocate the symbol in our .dynbss section, which will
534 become part of the .bss section of the executable. There will be
535 an entry for this symbol in the .dynsym section. The dynamic
536 object will contain position independent code, so all references
537 from the dynamic object to this symbol will go through the global
538 offset table. The dynamic linker will use the .dynsym entry to
539 determine the address it must put in the global offset table, so
540 both the dynamic object and the regular object will refer to the
541 same memory location for the variable.
543 Of course, if the symbol is sufficiently small, we must instead
544 allocate it in .sbss. FIXME: It would be better to do this if and
545 only if there were actually SDAREL relocs for that symbol. */
547 if (h->size <= elf_gp_size (dynobj))
548 s = bfd_get_section_by_name (dynobj, ".dynsbss");
550 s = bfd_get_section_by_name (dynobj, ".dynbss");
551 BFD_ASSERT (s != NULL);
553 /* We must generate a R_I370_COPY reloc to tell the dynamic linker to
554 copy the initial value out of the dynamic object and into the
555 runtime process image. We need to remember the offset into the
556 .rela.bss section we are going to use. */
557 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
561 if (h->size <= elf_gp_size (dynobj))
562 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
564 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
565 BFD_ASSERT (srel != NULL);
566 srel->size += sizeof (Elf32_External_Rela);
570 /* We need to figure out the alignment required for this symbol. I
571 have no idea how ELF linkers handle this. */
572 power_of_two = bfd_log2 (h->size);
573 if (power_of_two > 4)
576 /* Apply the required alignment. */
577 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
578 if (power_of_two > bfd_get_section_alignment (dynobj, s))
580 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
584 /* Define the symbol as being at this point in the section. */
585 h->root.u.def.section = s;
586 h->root.u.def.value = s->size;
588 /* Increment the section size to make room for the symbol. */
594 /* Increment the index of a dynamic symbol by a given amount. Called
595 via elf_link_hash_traverse. */
596 /* XXX hack alert bogus This routine is mostly all junk and almost
597 * certainly does the wrong thing. Its here simply because it does
598 * just enough to allow glibc-2.1 ld.so to compile & link.
602 i370_elf_adjust_dynindx (h, cparg)
603 struct elf_link_hash_entry *h;
606 int *cp = (int *) cparg;
610 "i370_elf_adjust_dynindx called, h->dynindx = %d, *cp = %d\n",
614 if (h->root.type == bfd_link_hash_warning)
615 h = (struct elf_link_hash_entry *) h->root.u.i.link;
617 if (h->dynindx != -1)
623 /* Set the sizes of the dynamic sections. */
624 /* XXX hack alert bogus This routine is mostly all junk and almost
625 * certainly does the wrong thing. Its here simply because it does
626 * just enough to allow glibc-2.1 ld.so to compile & link.
630 i370_elf_size_dynamic_sections (output_bfd, info)
632 struct bfd_link_info *info;
641 fprintf (stderr, "i370_elf_size_dynamic_sections called\n");
644 dynobj = elf_hash_table (info)->dynobj;
645 BFD_ASSERT (dynobj != NULL);
647 if (elf_hash_table (info)->dynamic_sections_created)
649 /* Set the contents of the .interp section to the interpreter. */
650 if (info->executable)
652 s = bfd_get_section_by_name (dynobj, ".interp");
653 BFD_ASSERT (s != NULL);
654 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
655 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
660 /* We may have created entries in the .rela.got, .rela.sdata, and
661 .rela.sdata2 sections. However, if we are not creating the
662 dynamic sections, we will not actually use these entries. Reset
663 the size of .rela.got, et al, which will cause it to get
664 stripped from the output file below. */
665 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
666 ".rela.sdata2", ".rela.sbss",
670 for (p = rela_sections; *p != (char *)0; p++)
672 s = bfd_get_section_by_name (dynobj, *p);
678 /* The check_relocs and adjust_dynamic_symbol entry points have
679 determined the sizes of the various dynamic sections. Allocate
684 for (s = dynobj->sections; s != NULL; s = s->next)
689 if ((s->flags & SEC_LINKER_CREATED) == 0)
692 /* It's OK to base decisions on the section name, because none
693 of the dynobj section names depend upon the input files. */
694 name = bfd_get_section_name (dynobj, s);
697 if (strcmp (name, ".plt") == 0)
701 /* Strip this section if we don't need it; see the
707 /* Remember whether there is a PLT. */
711 else if (strncmp (name, ".rela", 5) == 0)
715 /* If we don't need this section, strip it from the
716 output file. This is mostly to handle .rela.bss and
717 .rela.plt. We must create both sections in
718 create_dynamic_sections, because they must be created
719 before the linker maps input sections to output
720 sections. The linker does that before
721 adjust_dynamic_symbol is called, and it is that
722 function which decides whether anything needs to go
723 into these sections. */
731 /* Remember whether there are any relocation sections. */
734 /* If this relocation section applies to a read only
735 section, then we probably need a DT_TEXTREL entry. */
736 outname = bfd_get_section_name (output_bfd,
738 target = bfd_get_section_by_name (output_bfd, outname + 5);
740 && (target->flags & SEC_READONLY) != 0
741 && (target->flags & SEC_ALLOC) != 0)
744 /* We use the reloc_count field as a counter if we need
745 to copy relocs into the output file. */
749 else if (strcmp (name, ".got") != 0
750 && strcmp (name, ".sdata") != 0
751 && strcmp (name, ".sdata2") != 0)
753 /* It's not one of our sections, so don't allocate space. */
759 if (!bfd_section_removed_from_list (s->output_section->owner,
762 bfd_section_list_remove (s->output_section->owner,
764 --s->output_section->owner->section_count;
768 /* Allocate memory for the section contents. */
769 s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->size);
770 if (s->contents == NULL && s->size != 0)
774 if (elf_hash_table (info)->dynamic_sections_created)
776 /* Add some entries to the .dynamic section. We fill in the
777 values later, in i370_elf_finish_dynamic_sections, but we
778 must add the entries now so that we get the correct size for
779 the .dynamic section. The DT_DEBUG entry is filled in by the
780 dynamic linker and used by the debugger. */
781 #define add_dynamic_entry(TAG, VAL) \
782 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
786 if (!add_dynamic_entry (DT_DEBUG, 0))
792 if (!add_dynamic_entry (DT_PLTGOT, 0)
793 || !add_dynamic_entry (DT_PLTRELSZ, 0)
794 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
795 || !add_dynamic_entry (DT_JMPREL, 0))
801 if (!add_dynamic_entry (DT_RELA, 0)
802 || !add_dynamic_entry (DT_RELASZ, 0)
803 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
809 if (!add_dynamic_entry (DT_TEXTREL, 0))
811 info->flags |= DF_TEXTREL;
814 #undef add_dynamic_entry
816 /* If we are generating a shared library, we generate a section
817 symbol for each output section. These are local symbols, which
818 means that they must come first in the dynamic symbol table.
819 That means we must increment the dynamic symbol index of every
820 other dynamic symbol.
822 FIXME: We assume that there will never be relocations to
823 locations in linker-created sections that do not have
824 externally-visible names. Instead, we should work out precisely
825 which sections relocations are targeted at. */
830 for (c = 0, s = output_bfd->sections; s != NULL; s = s->next)
832 if ((s->flags & SEC_LINKER_CREATED) != 0
833 || (s->flags & SEC_ALLOC) == 0)
835 elf_section_data (s)->dynindx = -1;
839 /* These symbols will have no names, so we don't need to
840 fiddle with dynstr_index. */
842 elf_section_data (s)->dynindx = c + 1;
847 elf_link_hash_traverse (elf_hash_table (info),
848 i370_elf_adjust_dynindx,
850 elf_hash_table (info)->dynsymcount += c;
856 /* Look through the relocs for a section during the first phase, and
857 allocate space in the global offset table or procedure linkage
859 /* XXX hack alert bogus This routine is mostly all junk and almost
860 * certainly does the wrong thing. Its here simply because it does
861 * just enough to allow glibc-2.1 ld.so to compile & link.
865 i370_elf_check_relocs (abfd, info, sec, relocs)
867 struct bfd_link_info *info;
869 const Elf_Internal_Rela *relocs;
872 Elf_Internal_Shdr *symtab_hdr;
873 struct elf_link_hash_entry **sym_hashes;
874 const Elf_Internal_Rela *rel;
875 const Elf_Internal_Rela *rel_end;
876 bfd_vma *local_got_offsets;
879 if (info->relocatable)
883 _bfd_error_handler ("i370_elf_check_relocs called for section %A in %B",
887 dynobj = elf_hash_table (info)->dynobj;
888 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
889 sym_hashes = elf_sym_hashes (abfd);
890 local_got_offsets = elf_local_got_offsets (abfd);
894 rel_end = relocs + sec->reloc_count;
895 for (rel = relocs; rel < rel_end; rel++)
897 unsigned long r_symndx;
898 struct elf_link_hash_entry *h;
900 r_symndx = ELF32_R_SYM (rel->r_info);
901 if (r_symndx < symtab_hdr->sh_info)
904 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
910 "i370_elf_check_relocs needs to create relocation for %s\n",
911 (h && h->root.root.string)
912 ? h->root.root.string : "<unknown>");
918 name = (bfd_elf_string_from_elf_section
920 elf_elfheader (abfd)->e_shstrndx,
921 elf_section_data (sec)->rel_hdr.sh_name));
925 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
926 && strcmp (bfd_get_section_name (abfd, sec), name + 5) == 0);
928 sreloc = bfd_get_section_by_name (dynobj, name);
933 sreloc = bfd_make_section (dynobj, name);
934 flags = (SEC_HAS_CONTENTS | SEC_READONLY
935 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
936 if ((sec->flags & SEC_ALLOC) != 0)
937 flags |= SEC_ALLOC | SEC_LOAD;
939 || ! bfd_set_section_flags (dynobj, sreloc, flags)
940 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
945 sreloc->size += sizeof (Elf32_External_Rela);
947 /* FIXME: We should here do what the m68k and i386
948 backends do: if the reloc is pc-relative, record it
949 in case it turns out that the reloc is unnecessary
950 because the symbol is forced local by versioning or
951 we are linking with -Bdynamic. Fortunately this
952 case is not frequent. */
959 /* Finish up the dynamic sections. */
960 /* XXX hack alert bogus This routine is mostly all junk and almost
961 * certainly does the wrong thing. Its here simply because it does
962 * just enough to allow glibc-2.1 ld.so to compile & link.
966 i370_elf_finish_dynamic_sections (output_bfd, info)
968 struct bfd_link_info *info;
971 bfd *dynobj = elf_hash_table (info)->dynobj;
972 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
975 fprintf (stderr, "i370_elf_finish_dynamic_sections called\n");
978 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
980 if (elf_hash_table (info)->dynamic_sections_created)
983 Elf32_External_Dyn *dyncon, *dynconend;
985 splt = bfd_get_section_by_name (dynobj, ".plt");
986 BFD_ASSERT (splt != NULL && sdyn != NULL);
988 dyncon = (Elf32_External_Dyn *) sdyn->contents;
989 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
990 for (; dyncon < dynconend; dyncon++)
992 Elf_Internal_Dyn dyn;
996 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
1000 case DT_PLTGOT: name = ".plt"; size = FALSE; break;
1001 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
1002 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
1003 default: name = NULL; size = FALSE; break;
1010 s = bfd_get_section_by_name (output_bfd, name);
1016 dyn.d_un.d_ptr = s->vma;
1018 dyn.d_un.d_val = s->size;
1020 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
1025 /* Add a blrl instruction at _GLOBAL_OFFSET_TABLE_-4 so that a function can
1026 easily find the address of the _GLOBAL_OFFSET_TABLE_. */
1027 /* XXX this is clearly very wrong for the 370 arch */
1030 unsigned char *contents = sgot->contents;
1031 bfd_put_32 (output_bfd, (bfd_vma) 0x4e800021 /* blrl */, contents);
1034 bfd_put_32 (output_bfd, (bfd_vma) 0, contents+4);
1036 bfd_put_32 (output_bfd,
1037 sdyn->output_section->vma + sdyn->output_offset,
1040 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
1047 Elf_Internal_Sym sym;
1050 /* Set up the section symbols for the output sections. */
1052 sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
1053 BFD_ASSERT (sdynsym != NULL);
1057 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
1060 for (s = output_bfd->sections; s != NULL; s = s->next)
1063 Elf32_External_Sym *esym;
1065 sym.st_value = s->vma;
1067 indx = elf_section_data (s)->this_idx;
1068 dindx = elf_section_data (s)->dynindx;
1071 BFD_ASSERT(indx > 0);
1072 BFD_ASSERT(dindx > 0);
1074 if (dindx > maxdindx)
1077 sym.st_shndx = indx;
1079 esym = (Elf32_External_Sym *) sdynsym->contents + dindx;
1080 bfd_elf32_swap_symbol_out (output_bfd, &sym, (PTR) esym, (PTR) 0);
1084 /* Set the sh_info field of the output .dynsym section to the
1085 index of the first global symbol. */
1086 elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
1093 /* The RELOCATE_SECTION function is called by the ELF backend linker
1094 to handle the relocations for a section.
1096 The relocs are always passed as Rela structures; if the section
1097 actually uses Rel structures, the r_addend field will always be
1100 This function is responsible for adjust the section contents as
1101 necessary, and (if using Rela relocs and generating a
1102 relocatable output file) adjusting the reloc addend as
1105 This function does not have to worry about setting the reloc
1106 address or the reloc symbol index.
1108 LOCAL_SYMS is a pointer to the swapped in local symbols.
1110 LOCAL_SECTIONS is an array giving the section in the input file
1111 corresponding to the st_shndx field of each local symbol.
1113 The global hash table entry for the global symbols can be found
1114 via elf_sym_hashes (input_bfd).
1116 When generating relocatable output, this function must handle
1117 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1118 going to be the section symbol corresponding to the output
1119 section, which means that the addend must be adjusted
1123 i370_elf_relocate_section (output_bfd, info, input_bfd, input_section,
1124 contents, relocs, local_syms, local_sections)
1126 struct bfd_link_info *info;
1128 asection *input_section;
1130 Elf_Internal_Rela *relocs;
1131 Elf_Internal_Sym *local_syms;
1132 asection **local_sections;
1134 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1135 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
1136 bfd *dynobj = elf_hash_table (info)->dynobj;
1137 Elf_Internal_Rela *rel = relocs;
1138 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
1139 asection *sreloc = NULL;
1140 bfd_vma *local_got_offsets;
1141 bfd_boolean ret = TRUE;
1143 if (info->relocatable)
1147 _bfd_error_handler ("i370_elf_relocate_section called for %B section %A, %ld relocations%s",
1148 input_bfd, input_section,
1149 (long) input_section->reloc_count,
1150 (info->relocatable) ? " (relocatable)" : "");
1153 if (!i370_elf_howto_table[ R_I370_ADDR31 ]) /* Initialize howto table if needed */
1154 i370_elf_howto_init ();
1156 local_got_offsets = elf_local_got_offsets (input_bfd);
1158 for (; rel < relend; rel++)
1160 enum i370_reloc_type r_type = (enum i370_reloc_type)ELF32_R_TYPE (rel->r_info);
1161 bfd_vma offset = rel->r_offset;
1162 bfd_vma addend = rel->r_addend;
1163 bfd_reloc_status_type r = bfd_reloc_other;
1164 Elf_Internal_Sym *sym = (Elf_Internal_Sym *)0;
1165 asection *sec = (asection *)0;
1166 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *)0;
1167 const char *sym_name = (const char *)0;
1168 reloc_howto_type *howto;
1169 unsigned long r_symndx;
1172 /* Unknown relocation handling */
1173 if ((unsigned)r_type >= (unsigned)R_I370_max
1174 || !i370_elf_howto_table[(int)r_type])
1176 (*_bfd_error_handler) ("%B: unknown relocation type %d",
1180 bfd_set_error (bfd_error_bad_value);
1185 howto = i370_elf_howto_table[(int)r_type];
1186 r_symndx = ELF32_R_SYM (rel->r_info);
1188 if (r_symndx < symtab_hdr->sh_info)
1190 sym = local_syms + r_symndx;
1191 sec = local_sections[r_symndx];
1192 sym_name = "<local symbol>";
1194 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
1195 addend = rel->r_addend;
1199 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1200 while (h->root.type == bfd_link_hash_indirect
1201 || h->root.type == bfd_link_hash_warning)
1202 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1203 sym_name = h->root.root.string;
1204 if (h->root.type == bfd_link_hash_defined
1205 || h->root.type == bfd_link_hash_defweak)
1207 sec = h->root.u.def.section;
1209 && ((! info->symbolic && h->dynindx != -1)
1211 && (input_section->flags & SEC_ALLOC) != 0
1212 && (r_type == R_I370_ADDR31
1213 || r_type == R_I370_COPY
1214 || r_type == R_I370_ADDR16
1215 || r_type == R_I370_RELATIVE))
1217 /* In these cases, we don't need the relocation
1218 value. We check specially because in some
1219 obscure cases sec->output_section will be NULL. */
1223 relocation = (h->root.u.def.value
1224 + sec->output_section->vma
1225 + sec->output_offset);
1227 else if (h->root.type == bfd_link_hash_undefweak)
1229 else if (info->unresolved_syms_in_objects == RM_IGNORE
1230 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1234 if ((*info->callbacks->undefined_symbol)
1235 (info, h->root.root.string, input_bfd,
1236 input_section, rel->r_offset,
1237 (info->unresolved_syms_in_objects == RM_GENERATE_ERROR
1238 || ELF_ST_VISIBILITY (h->other))))
1247 switch ((int) r_type)
1250 (*_bfd_error_handler)
1251 ("%B: unknown relocation type %d for symbol %s",
1252 input_bfd, (int) r_type, sym_name);
1254 bfd_set_error (bfd_error_bad_value);
1258 case (int)R_I370_NONE:
1261 /* Relocations that may need to be propagated if this is a shared
1263 case (int)R_I370_REL31:
1264 /* If these relocations are not to a named symbol, they can be
1265 handled right here, no need to bother the dynamic linker. */
1267 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1271 /* Relocations that always need to be propagated if this is a shared
1273 case (int)R_I370_ADDR31:
1274 case (int)R_I370_ADDR16:
1278 Elf_Internal_Rela outrel;
1284 "i370_elf_relocate_section needs to create relocation for %s\n",
1285 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
1288 /* When generating a shared object, these relocations
1289 are copied into the output file to be resolved at run
1296 name = (bfd_elf_string_from_elf_section
1298 elf_elfheader (input_bfd)->e_shstrndx,
1299 elf_section_data (input_section)->rel_hdr.sh_name));
1303 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1304 && strcmp (bfd_get_section_name (input_bfd,
1308 sreloc = bfd_get_section_by_name (dynobj, name);
1309 BFD_ASSERT (sreloc != NULL);
1315 _bfd_elf_section_offset (output_bfd, info, input_section,
1317 if (outrel.r_offset == (bfd_vma) -1
1318 || outrel.r_offset == (bfd_vma) -2)
1319 skip = (int) outrel.r_offset;
1320 outrel.r_offset += (input_section->output_section->vma
1321 + input_section->output_offset);
1324 memset (&outrel, 0, sizeof outrel);
1325 /* h->dynindx may be -1 if this symbol was marked to
1328 && ((! info->symbolic && h->dynindx != -1)
1329 || !h->def_regular))
1331 BFD_ASSERT (h->dynindx != -1);
1332 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1333 outrel.r_addend = rel->r_addend;
1337 if (r_type == R_I370_ADDR31)
1339 outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE);
1340 outrel.r_addend = relocation + rel->r_addend;
1346 if (bfd_is_abs_section (sec))
1348 else if (sec == NULL || sec->owner == NULL)
1350 bfd_set_error (bfd_error_bad_value);
1357 osec = sec->output_section;
1358 indx = elf_section_data (osec)->dynindx;
1359 BFD_ASSERT(indx > 0);
1363 printf ("indx=%d section=%s flags=%08x name=%s\n",
1364 indx, osec->name, osec->flags,
1365 h->root.root.string);
1370 outrel.r_info = ELF32_R_INFO (indx, r_type);
1371 outrel.r_addend = relocation + rel->r_addend;
1375 loc = sreloc->contents;
1376 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1377 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1379 /* This reloc will be computed at runtime, so there's no
1380 need to do anything now, unless this is a RELATIVE
1381 reloc in an unallocated section. */
1383 || (input_section->flags & SEC_ALLOC) != 0
1384 || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE)
1389 case (int)R_I370_COPY:
1390 case (int)R_I370_RELATIVE:
1391 (*_bfd_error_handler)
1392 ("%B: Relocation %s is not yet supported for symbol %s.",
1394 i370_elf_howto_table[(int) r_type]->name,
1397 bfd_set_error (bfd_error_invalid_operation);
1403 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
1412 r = _bfd_final_link_relocate (howto,
1420 if (r != bfd_reloc_ok)
1428 case bfd_reloc_overflow:
1436 name = bfd_elf_string_from_elf_section (input_bfd,
1437 symtab_hdr->sh_link,
1443 name = bfd_section_name (input_bfd, sec);
1446 (*info->callbacks->reloc_overflow) (info,
1447 (h ? &h->root : NULL),
1462 fprintf (stderr, "\n");
1469 i370_elf_post_process_headers (abfd, link_info)
1471 struct bfd_link_info * link_info ATTRIBUTE_UNUSED;
1473 Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */
1475 i_ehdrp = elf_elfheader (abfd);
1476 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_LINUX;
1479 #define TARGET_BIG_SYM bfd_elf32_i370_vec
1480 #define TARGET_BIG_NAME "elf32-i370"
1481 #define ELF_ARCH bfd_arch_i370
1482 #define ELF_MACHINE_CODE EM_S370
1484 #define ELF_MACHINE_ALT1 EM_I370_OLD
1486 #define ELF_MAXPAGESIZE 0x1000
1487 #define elf_info_to_howto i370_elf_info_to_howto
1489 #define elf_backend_plt_not_loaded 1
1490 #define elf_backend_got_symbol_offset 4
1491 #define elf_backend_rela_normal 1
1493 #define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup
1494 #define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags
1495 #define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data
1496 #define elf_backend_relocate_section i370_elf_relocate_section
1498 /* dynamic loader support is mostly broken; just enough here to be able to
1499 * link glibc's ld.so without errors.
1501 #define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections
1502 #define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections
1503 #define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections
1504 #define elf_backend_fake_sections i370_elf_fake_sections
1505 #define elf_backend_section_from_shdr i370_elf_section_from_shdr
1506 #define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol
1507 #define elf_backend_check_relocs i370_elf_check_relocs
1510 #define elf_backend_add_symbol_hook i370_elf_add_symbol_hook
1511 #define elf_backend_finish_dynamic_symbol i370_elf_finish_dynamic_symbol
1512 #define elf_backend_additional_program_headers i370_elf_additional_program_headers
1513 #define elf_backend_modify_segment_map i370_elf_modify_segment_map
1516 #define elf_backend_post_process_headers i370_elf_post_process_headers
1518 static int i370_noop
1521 static int i370_noop ()
1526 /* we need to define these at least as no-ops to link glibc ld.so */
1528 #define elf_backend_add_symbol_hook \
1530 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Sym *, \
1531 const char **, flagword *, asection **, bfd_vma *))) i370_noop
1532 #define elf_backend_finish_dynamic_symbol \
1534 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \
1535 Elf_Internal_Sym *))) i370_noop
1536 #define elf_backend_additional_program_headers \
1537 (int (*) PARAMS ((bfd *))) i370_noop
1538 #define elf_backend_modify_segment_map \
1539 (bfd_boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) i370_noop
1541 #include "elf32-target.h"