1 /* i370-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2010, 2011 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 3 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,
22 MA 02110-1301, USA. */
24 /* This file is based on a preliminary PowerPC ELF ABI.
25 But its been hacked on for the IBM 360/370 architectures.
26 Basically, the 31bit relocation works, and just about everything
27 else is a wild card. In particular, don't expect shared libs or
28 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 /* Initialize the i370_elf_howto_table, so that linear accesses can be done. */
232 i370_elf_howto_init (void)
234 unsigned int i, type;
236 for (i = 0; i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]); i++)
238 type = i370_elf_howto_raw[i].type;
239 BFD_ASSERT (type < sizeof (i370_elf_howto_table) / sizeof (i370_elf_howto_table[0]));
240 i370_elf_howto_table[type] = &i370_elf_howto_raw[i];
244 static reloc_howto_type *
245 i370_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
246 bfd_reloc_code_real_type code)
248 enum i370_reloc_type i370_reloc = R_I370_NONE;
250 if (!i370_elf_howto_table[ R_I370_ADDR31 ])
251 /* Initialize howto table if needed. */
252 i370_elf_howto_init ();
259 case BFD_RELOC_NONE: i370_reloc = R_I370_NONE; break;
260 case BFD_RELOC_32: i370_reloc = R_I370_ADDR31; break;
261 case BFD_RELOC_16: i370_reloc = R_I370_ADDR16; break;
262 case BFD_RELOC_32_PCREL: i370_reloc = R_I370_REL31; break;
263 case BFD_RELOC_CTOR: i370_reloc = R_I370_ADDR31; break;
264 case BFD_RELOC_I370_D12: i370_reloc = R_I370_ADDR12; break;
267 return i370_elf_howto_table[ (int)i370_reloc ];
270 static reloc_howto_type *
271 i370_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
277 i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]);
279 if (i370_elf_howto_raw[i].name != NULL
280 && strcasecmp (i370_elf_howto_raw[i].name, r_name) == 0)
281 return &i370_elf_howto_raw[i];
286 /* The name of the dynamic interpreter. This is put in the .interp
289 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
291 /* Set the howto pointer for an i370 ELF reloc. */
294 i370_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
296 Elf_Internal_Rela *dst)
298 if (!i370_elf_howto_table[ R_I370_ADDR31 ])
299 /* Initialize howto table. */
300 i370_elf_howto_init ();
302 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max);
303 cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
306 /* Hack alert -- the following several routines look generic to me ...
307 why are we bothering with them ? */
308 /* Function to set whether a module needs the -mrelocatable bit set. */
311 i370_elf_set_private_flags (bfd *abfd, flagword flags)
313 BFD_ASSERT (!elf_flags_init (abfd)
314 || elf_elfheader (abfd)->e_flags == flags);
316 elf_elfheader (abfd)->e_flags = flags;
317 elf_flags_init (abfd) = TRUE;
321 /* Merge backend specific data from an object file to the output
322 object file when linking. */
325 i370_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
330 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
331 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
334 new_flags = elf_elfheader (ibfd)->e_flags;
335 old_flags = elf_elfheader (obfd)->e_flags;
336 if (!elf_flags_init (obfd)) /* First call, no flags set. */
338 elf_flags_init (obfd) = TRUE;
339 elf_elfheader (obfd)->e_flags = new_flags;
342 else if (new_flags == old_flags) /* Compatible flags are ok. */
345 else /* Incompatible flags. */
347 (*_bfd_error_handler)
348 ("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
349 ibfd, (long) new_flags, (long) old_flags);
351 bfd_set_error (bfd_error_bad_value);
358 /* Handle an i370 specific section when reading an object file. This
359 is called when elfcode.h finds a section with an unknown type. */
360 /* XXX hack alert bogus This routine is mostly all junk and almost
361 certainly does the wrong thing. Its here simply because it does
362 just enough to allow glibc-2.1 ld.so to compile & link. */
365 i370_elf_section_from_shdr (bfd *abfd,
366 Elf_Internal_Shdr *hdr,
373 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
376 newsect = hdr->bfd_section;
377 flags = bfd_get_section_flags (abfd, newsect);
378 if (hdr->sh_type == SHT_ORDERED)
379 flags |= SEC_SORT_ENTRIES;
381 bfd_set_section_flags (abfd, newsect, flags);
385 /* Set up any other section flags and such that may be necessary. */
386 /* XXX hack alert bogus This routine is mostly all junk and almost
387 certainly does the wrong thing. Its here simply because it does
388 just enough to allow glibc-2.1 ld.so to compile & link. */
391 i370_elf_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
392 Elf_Internal_Shdr *shdr,
395 if ((asect->flags & (SEC_GROUP | SEC_EXCLUDE)) == SEC_EXCLUDE)
396 shdr->sh_flags |= SHF_EXCLUDE;
398 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
399 shdr->sh_type = SHT_ORDERED;
404 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
405 to output sections (just like _bfd_elf_create_dynamic_sections has
406 to create .dynbss and .rela.bss). */
407 /* XXX hack alert bogus This routine is mostly all junk and almost
408 certainly does the wrong thing. Its here simply because it does
409 just enough to allow glibc-2.1 ld.so to compile & link. */
412 i370_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
417 if (!_bfd_elf_create_dynamic_sections(abfd, info))
420 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
421 | SEC_LINKER_CREATED);
423 s = bfd_make_section_with_flags (abfd, ".dynsbss",
424 SEC_ALLOC | SEC_LINKER_CREATED);
430 s = bfd_make_section_with_flags (abfd, ".rela.sbss",
431 flags | SEC_READONLY);
433 || ! bfd_set_section_alignment (abfd, s, 2))
437 /* XXX beats me, seem to need a rela.text ... */
438 s = bfd_make_section_with_flags (abfd, ".rela.text",
439 flags | SEC_READONLY);
441 || ! bfd_set_section_alignment (abfd, s, 2))
446 /* Adjust a symbol defined by a dynamic object and referenced by a
447 regular object. The current definition is in some section of the
448 dynamic object, but we're not including those sections. We have to
449 change the definition to something the rest of the link can
451 /* XXX hack alert bogus This routine is mostly all junk and almost
452 certainly does the wrong thing. Its here simply because it does
453 just enough to allow glibc-2.1 ld.so to compile & link. */
456 i370_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
457 struct elf_link_hash_entry *h)
459 bfd *dynobj = elf_hash_table (info)->dynobj;
463 fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n",
464 h->root.root.string);
467 /* Make sure we know what is going on here. */
468 BFD_ASSERT (dynobj != NULL
470 || h->u.weakdef != NULL
473 && !h->def_regular)));
475 s = bfd_get_section_by_name (dynobj, ".rela.text");
476 BFD_ASSERT (s != NULL);
477 s->size += sizeof (Elf32_External_Rela);
479 /* If this is a weak symbol, and there is a real definition, the
480 processor independent code will have arranged for us to see the
481 real definition first, and we can just use the same value. */
482 if (h->u.weakdef != NULL)
484 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
485 || h->u.weakdef->root.type == bfd_link_hash_defweak);
486 h->root.u.def.section = h->u.weakdef->root.u.def.section;
487 h->root.u.def.value = h->u.weakdef->root.u.def.value;
491 /* This is a reference to a symbol defined by a dynamic object which
492 is not a function. */
494 /* If we are creating a shared library, we must presume that the
495 only references to the symbol are via the global offset table.
496 For such cases we need not do anything here; the relocations will
497 be handled correctly by relocate_section. */
503 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
504 h->root.root.string);
508 /* We must allocate the symbol in our .dynbss section, which will
509 become part of the .bss section of the executable. There will be
510 an entry for this symbol in the .dynsym section. The dynamic
511 object will contain position independent code, so all references
512 from the dynamic object to this symbol will go through the global
513 offset table. The dynamic linker will use the .dynsym entry to
514 determine the address it must put in the global offset table, so
515 both the dynamic object and the regular object will refer to the
516 same memory location for the variable.
518 Of course, if the symbol is sufficiently small, we must instead
519 allocate it in .sbss. FIXME: It would be better to do this if and
520 only if there were actually SDAREL relocs for that symbol. */
522 if (h->size <= elf_gp_size (dynobj))
523 s = bfd_get_section_by_name (dynobj, ".dynsbss");
525 s = bfd_get_section_by_name (dynobj, ".dynbss");
526 BFD_ASSERT (s != NULL);
528 /* We must generate a R_I370_COPY reloc to tell the dynamic linker to
529 copy the initial value out of the dynamic object and into the
530 runtime process image. We need to remember the offset into the
531 .rela.bss section we are going to use. */
532 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
536 if (h->size <= elf_gp_size (dynobj))
537 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
539 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
540 BFD_ASSERT (srel != NULL);
541 srel->size += sizeof (Elf32_External_Rela);
545 return _bfd_elf_adjust_dynamic_copy (h, s);
548 /* Increment the index of a dynamic symbol by a given amount. Called
549 via elf_link_hash_traverse. */
550 /* XXX hack alert bogus This routine is mostly all junk and almost
551 certainly does the wrong thing. Its here simply because it does
552 just enough to allow glibc-2.1 ld.so to compile & link. */
555 i370_elf_adjust_dynindx (struct elf_link_hash_entry *h, void * cparg)
557 int *cp = (int *) cparg;
561 "i370_elf_adjust_dynindx called, h->dynindx = %ld, *cp = %d\n",
565 if (h->dynindx != -1)
571 /* Set the sizes of the dynamic sections. */
572 /* XXX hack alert bogus This routine is mostly all junk and almost
573 certainly does the wrong thing. Its here simply because it does
574 just enough to allow glibc-2.1 ld.so to compile & link. */
577 i370_elf_size_dynamic_sections (bfd *output_bfd,
578 struct bfd_link_info *info)
587 fprintf (stderr, "i370_elf_size_dynamic_sections called\n");
590 dynobj = elf_hash_table (info)->dynobj;
591 BFD_ASSERT (dynobj != NULL);
593 if (elf_hash_table (info)->dynamic_sections_created)
595 /* Set the contents of the .interp section to the interpreter. */
596 if (info->executable)
598 s = bfd_get_section_by_name (dynobj, ".interp");
599 BFD_ASSERT (s != NULL);
600 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
601 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
606 /* We may have created entries in the .rela.got, .rela.sdata, and
607 .rela.sdata2 sections. However, if we are not creating the
608 dynamic sections, we will not actually use these entries. Reset
609 the size of .rela.got, et al, which will cause it to get
610 stripped from the output file below. */
611 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
612 ".rela.sdata2", ".rela.sbss",
616 for (p = rela_sections; *p != NULL; p++)
618 s = bfd_get_section_by_name (dynobj, *p);
624 /* The check_relocs and adjust_dynamic_symbol entry points have
625 determined the sizes of the various dynamic sections. Allocate
630 for (s = dynobj->sections; s != NULL; s = s->next)
634 if ((s->flags & SEC_LINKER_CREATED) == 0)
637 /* It's OK to base decisions on the section name, because none
638 of the dynobj section names depend upon the input files. */
639 name = bfd_get_section_name (dynobj, s);
641 if (strcmp (name, ".plt") == 0)
643 /* Remember whether there is a PLT. */
646 else if (CONST_STRNEQ (name, ".rela"))
653 /* Remember whether there are any relocation sections. */
656 /* If this relocation section applies to a read only
657 section, then we probably need a DT_TEXTREL entry. */
658 outname = bfd_get_section_name (output_bfd,
660 target = bfd_get_section_by_name (output_bfd, outname + 5);
662 && (target->flags & SEC_READONLY) != 0
663 && (target->flags & SEC_ALLOC) != 0)
666 /* We use the reloc_count field as a counter if we need
667 to copy relocs into the output file. */
671 else if (strcmp (name, ".got") != 0
672 && strcmp (name, ".sdata") != 0
673 && strcmp (name, ".sdata2") != 0
674 && strcmp (name, ".dynbss") != 0
675 && strcmp (name, ".dynsbss") != 0)
677 /* It's not one of our sections, so don't allocate space. */
683 /* If we don't need this section, strip it from the
684 output file. This is mostly to handle .rela.bss and
685 .rela.plt. We must create both sections in
686 create_dynamic_sections, because they must be created
687 before the linker maps input sections to output
688 sections. The linker does that before
689 adjust_dynamic_symbol is called, and it is that
690 function which decides whether anything needs to go
691 into these sections. */
692 s->flags |= SEC_EXCLUDE;
696 if ((s->flags & SEC_HAS_CONTENTS) == 0)
699 /* Allocate memory for the section contents. */
700 s->contents = bfd_zalloc (dynobj, s->size);
701 if (s->contents == NULL)
705 if (elf_hash_table (info)->dynamic_sections_created)
707 /* Add some entries to the .dynamic section. We fill in the
708 values later, in i370_elf_finish_dynamic_sections, but we
709 must add the entries now so that we get the correct size for
710 the .dynamic section. The DT_DEBUG entry is filled in by the
711 dynamic linker and used by the debugger. */
712 #define add_dynamic_entry(TAG, VAL) \
713 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
717 if (!add_dynamic_entry (DT_DEBUG, 0))
723 if (!add_dynamic_entry (DT_PLTGOT, 0)
724 || !add_dynamic_entry (DT_PLTRELSZ, 0)
725 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
726 || !add_dynamic_entry (DT_JMPREL, 0))
732 if (!add_dynamic_entry (DT_RELA, 0)
733 || !add_dynamic_entry (DT_RELASZ, 0)
734 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
740 if (!add_dynamic_entry (DT_TEXTREL, 0))
742 info->flags |= DF_TEXTREL;
745 #undef add_dynamic_entry
747 /* If we are generating a shared library, we generate a section
748 symbol for each output section. These are local symbols, which
749 means that they must come first in the dynamic symbol table.
750 That means we must increment the dynamic symbol index of every
751 other dynamic symbol.
753 FIXME: We assume that there will never be relocations to
754 locations in linker-created sections that do not have
755 externally-visible names. Instead, we should work out precisely
756 which sections relocations are targeted at. */
761 for (c = 0, s = output_bfd->sections; s != NULL; s = s->next)
763 if ((s->flags & SEC_LINKER_CREATED) != 0
764 || (s->flags & SEC_ALLOC) == 0)
766 elf_section_data (s)->dynindx = -1;
770 /* These symbols will have no names, so we don't need to
771 fiddle with dynstr_index. */
773 elf_section_data (s)->dynindx = c + 1;
778 elf_link_hash_traverse (elf_hash_table (info),
779 i370_elf_adjust_dynindx, & c);
780 elf_hash_table (info)->dynsymcount += c;
786 /* Look through the relocs for a section during the first phase, and
787 allocate space in the global offset table or procedure linkage
789 /* XXX hack alert bogus This routine is mostly all junk and almost
790 certainly does the wrong thing. Its here simply because it does
791 just enough to allow glibc-2.1 ld.so to compile & link. */
794 i370_elf_check_relocs (bfd *abfd,
795 struct bfd_link_info *info,
797 const Elf_Internal_Rela *relocs)
800 Elf_Internal_Shdr *symtab_hdr;
801 struct elf_link_hash_entry **sym_hashes;
802 const Elf_Internal_Rela *rel;
803 const Elf_Internal_Rela *rel_end;
806 if (info->relocatable)
810 _bfd_error_handler ("i370_elf_check_relocs called for section %A in %B",
814 dynobj = elf_hash_table (info)->dynobj;
815 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
816 sym_hashes = elf_sym_hashes (abfd);
820 rel_end = relocs + sec->reloc_count;
821 for (rel = relocs; rel < rel_end; rel++)
823 unsigned long r_symndx;
824 struct elf_link_hash_entry *h;
826 r_symndx = ELF32_R_SYM (rel->r_info);
827 if (r_symndx < symtab_hdr->sh_info)
831 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
832 while (h->root.type == bfd_link_hash_indirect
833 || h->root.type == bfd_link_hash_warning)
834 h = (struct elf_link_hash_entry *) h->root.u.i.link;
841 "i370_elf_check_relocs needs to create relocation for %s\n",
842 (h && h->root.root.string)
843 ? h->root.root.string : "<unknown>");
847 sreloc = _bfd_elf_make_dynamic_reloc_section
848 (sec, dynobj, 2, abfd, /*rela?*/ TRUE);
854 sreloc->size += sizeof (Elf32_External_Rela);
856 /* FIXME: We should here do what the m68k and i386
857 backends do: if the reloc is pc-relative, record it
858 in case it turns out that the reloc is unnecessary
859 because the symbol is forced local by versioning or
860 we are linking with -Bdynamic. Fortunately this
861 case is not frequent. */
868 /* Finish up the dynamic sections. */
869 /* XXX hack alert bogus This routine is mostly all junk and almost
870 certainly does the wrong thing. Its here simply because it does
871 just enough to allow glibc-2.1 ld.so to compile & link. */
874 i370_elf_finish_dynamic_sections (bfd *output_bfd,
875 struct bfd_link_info *info)
878 bfd *dynobj = elf_hash_table (info)->dynobj;
879 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
882 fprintf (stderr, "i370_elf_finish_dynamic_sections called\n");
885 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
887 if (elf_hash_table (info)->dynamic_sections_created)
890 Elf32_External_Dyn *dyncon, *dynconend;
892 splt = bfd_get_section_by_name (dynobj, ".plt");
893 BFD_ASSERT (splt != NULL && sdyn != NULL);
895 dyncon = (Elf32_External_Dyn *) sdyn->contents;
896 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
897 for (; dyncon < dynconend; dyncon++)
899 Elf_Internal_Dyn dyn;
903 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
907 case DT_PLTGOT: name = ".plt"; size = FALSE; break;
908 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
909 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
910 default: name = NULL; size = FALSE; break;
917 s = bfd_get_section_by_name (output_bfd, name);
923 dyn.d_un.d_ptr = s->vma;
925 dyn.d_un.d_val = s->size;
927 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
932 if (sgot && sgot->size != 0)
934 unsigned char *contents = sgot->contents;
937 bfd_put_32 (output_bfd, (bfd_vma) 0, contents);
939 bfd_put_32 (output_bfd,
940 sdyn->output_section->vma + sdyn->output_offset,
943 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
950 Elf_Internal_Sym sym;
953 /* Set up the section symbols for the output sections. */
955 sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
956 BFD_ASSERT (sdynsym != NULL);
960 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
962 sym.st_target_internal = 0;
964 for (s = output_bfd->sections; s != NULL; s = s->next)
967 Elf32_External_Sym *esym;
969 sym.st_value = s->vma;
971 indx = elf_section_data (s)->this_idx;
972 dindx = elf_section_data (s)->dynindx;
975 BFD_ASSERT(indx > 0);
976 BFD_ASSERT(dindx > 0);
978 if (dindx > maxdindx)
983 esym = (Elf32_External_Sym *) sdynsym->contents + dindx;
984 bfd_elf32_swap_symbol_out (output_bfd, &sym, esym, NULL);
988 /* Set the sh_info field of the output .dynsym section to the
989 index of the first global symbol. */
990 elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
997 /* The RELOCATE_SECTION function is called by the ELF backend linker
998 to handle the relocations for a section.
1000 The relocs are always passed as Rela structures; if the section
1001 actually uses Rel structures, the r_addend field will always be
1004 This function is responsible for adjust the section contents as
1005 necessary, and (if using Rela relocs and generating a
1006 relocatable output file) adjusting the reloc addend as
1009 This function does not have to worry about setting the reloc
1010 address or the reloc symbol index.
1012 LOCAL_SYMS is a pointer to the swapped in local symbols.
1014 LOCAL_SECTIONS is an array giving the section in the input file
1015 corresponding to the st_shndx field of each local symbol.
1017 The global hash table entry for the global symbols can be found
1018 via elf_sym_hashes (input_bfd).
1020 When generating relocatable output, this function must handle
1021 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1022 going to be the section symbol corresponding to the output
1023 section, which means that the addend must be adjusted
1027 i370_elf_relocate_section (bfd *output_bfd,
1028 struct bfd_link_info *info,
1030 asection *input_section,
1032 Elf_Internal_Rela *relocs,
1033 Elf_Internal_Sym *local_syms,
1034 asection **local_sections)
1036 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1037 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
1038 Elf_Internal_Rela *rel = relocs;
1039 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
1040 asection *sreloc = NULL;
1041 bfd_boolean ret = TRUE;
1044 _bfd_error_handler ("i370_elf_relocate_section called for %B section %A, %ld relocations%s",
1045 input_bfd, input_section,
1046 (long) input_section->reloc_count,
1047 (info->relocatable) ? " (relocatable)" : "");
1050 if (!i370_elf_howto_table[ R_I370_ADDR31 ])
1051 /* Initialize howto table if needed. */
1052 i370_elf_howto_init ();
1054 for (; rel < relend; rel++)
1056 enum i370_reloc_type r_type = (enum i370_reloc_type) ELF32_R_TYPE (rel->r_info);
1057 bfd_vma offset = rel->r_offset;
1058 bfd_vma addend = rel->r_addend;
1059 bfd_reloc_status_type r = bfd_reloc_other;
1060 Elf_Internal_Sym *sym = NULL;
1061 asection *sec = NULL;
1062 struct elf_link_hash_entry * h = NULL;
1063 const char *sym_name = NULL;
1064 reloc_howto_type *howto;
1065 unsigned long r_symndx;
1068 /* Unknown relocation handling. */
1069 if ((unsigned) r_type >= (unsigned) R_I370_max
1070 || !i370_elf_howto_table[(int)r_type])
1072 (*_bfd_error_handler) ("%B: unknown relocation type %d",
1076 bfd_set_error (bfd_error_bad_value);
1081 howto = i370_elf_howto_table[(int) r_type];
1082 r_symndx = ELF32_R_SYM (rel->r_info);
1085 if (r_symndx < symtab_hdr->sh_info)
1087 sym = local_syms + r_symndx;
1088 sec = local_sections[r_symndx];
1089 sym_name = "<local symbol>";
1091 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel);
1092 addend = rel->r_addend;
1096 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1097 while (h->root.type == bfd_link_hash_indirect
1098 || h->root.type == bfd_link_hash_warning)
1099 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1100 sym_name = h->root.root.string;
1101 if (h->root.type == bfd_link_hash_defined
1102 || h->root.type == bfd_link_hash_defweak)
1104 sec = h->root.u.def.section;
1106 && ((! info->symbolic && h->dynindx != -1)
1108 && (input_section->flags & SEC_ALLOC) != 0
1109 && (r_type == R_I370_ADDR31
1110 || r_type == R_I370_COPY
1111 || r_type == R_I370_ADDR16
1112 || r_type == R_I370_RELATIVE))
1113 /* In these cases, we don't need the relocation
1114 value. We check specially because in some
1115 obscure cases sec->output_section will be NULL. */
1118 relocation = (h->root.u.def.value
1119 + sec->output_section->vma
1120 + sec->output_offset);
1122 else if (h->root.type == bfd_link_hash_undefweak)
1124 else if (info->unresolved_syms_in_objects == RM_IGNORE
1125 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1127 else if (!info->relocatable)
1129 if ((*info->callbacks->undefined_symbol)
1130 (info, h->root.root.string, input_bfd,
1131 input_section, rel->r_offset,
1132 (info->unresolved_syms_in_objects == RM_GENERATE_ERROR
1133 || ELF_ST_VISIBILITY (h->other))))
1141 if (sec != NULL && elf_discarded_section (sec))
1142 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
1143 rel, relend, howto, contents);
1145 if (info->relocatable)
1148 switch ((int) r_type)
1151 (*_bfd_error_handler)
1152 ("%B: unknown relocation type %d for symbol %s",
1153 input_bfd, (int) r_type, sym_name);
1155 bfd_set_error (bfd_error_bad_value);
1159 case (int) R_I370_NONE:
1162 /* Relocations that may need to be propagated if this is a shared
1164 case (int) R_I370_REL31:
1165 /* If these relocations are not to a named symbol, they can be
1166 handled right here, no need to bother the dynamic linker. */
1168 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1172 /* Relocations that always need to be propagated if this is a shared
1174 case (int) R_I370_ADDR31:
1175 case (int) R_I370_ADDR16:
1177 && r_symndx != STN_UNDEF)
1179 Elf_Internal_Rela outrel;
1185 "i370_elf_relocate_section needs to create relocation for %s\n",
1186 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
1189 /* When generating a shared object, these relocations
1190 are copied into the output file to be resolved at run
1195 sreloc = _bfd_elf_get_dynamic_reloc_section
1196 (input_bfd, input_section, /*rela?*/ TRUE);
1204 _bfd_elf_section_offset (output_bfd, info, input_section,
1206 if (outrel.r_offset == (bfd_vma) -1
1207 || outrel.r_offset == (bfd_vma) -2)
1208 skip = (int) outrel.r_offset;
1209 outrel.r_offset += (input_section->output_section->vma
1210 + input_section->output_offset);
1213 memset (&outrel, 0, sizeof outrel);
1214 /* h->dynindx may be -1 if this symbol was marked to
1217 && ((! info->symbolic && h->dynindx != -1)
1218 || !h->def_regular))
1220 BFD_ASSERT (h->dynindx != -1);
1221 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1222 outrel.r_addend = rel->r_addend;
1226 if (r_type == R_I370_ADDR31)
1228 outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE);
1229 outrel.r_addend = relocation + rel->r_addend;
1235 if (bfd_is_abs_section (sec))
1237 else if (sec == NULL || sec->owner == NULL)
1239 bfd_set_error (bfd_error_bad_value);
1246 /* We are turning this relocation into one
1247 against a section symbol. It would be
1248 proper to subtract the symbol's value,
1249 osec->vma, from the emitted reloc addend,
1250 but ld.so expects buggy relocs. */
1251 osec = sec->output_section;
1252 indx = elf_section_data (osec)->dynindx;
1255 struct elf_link_hash_table *htab;
1256 htab = elf_hash_table (info);
1257 osec = htab->text_index_section;
1258 indx = elf_section_data (osec)->dynindx;
1260 BFD_ASSERT (indx != 0);
1264 printf ("indx=%ld section=%s flags=%08x name=%s\n",
1265 indx, osec->name, osec->flags,
1266 h->root.root.string);
1271 outrel.r_info = ELF32_R_INFO (indx, r_type);
1272 outrel.r_addend = relocation + rel->r_addend;
1276 loc = sreloc->contents;
1277 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1278 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1280 /* This reloc will be computed at runtime, so there's no
1281 need to do anything now, unless this is a RELATIVE
1282 reloc in an unallocated section. */
1284 || (input_section->flags & SEC_ALLOC) != 0
1285 || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE)
1290 case (int) R_I370_COPY:
1291 case (int) R_I370_RELATIVE:
1292 (*_bfd_error_handler)
1293 ("%B: Relocation %s is not yet supported for symbol %s.",
1295 i370_elf_howto_table[(int) r_type]->name,
1298 bfd_set_error (bfd_error_invalid_operation);
1304 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
1313 r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
1314 offset, relocation, addend);
1316 if (r != bfd_reloc_ok)
1324 case bfd_reloc_overflow:
1332 name = bfd_elf_string_from_elf_section (input_bfd,
1333 symtab_hdr->sh_link,
1339 name = bfd_section_name (input_bfd, sec);
1342 (*info->callbacks->reloc_overflow) (info,
1343 (h ? &h->root : NULL),
1357 fprintf (stderr, "\n");
1363 #define TARGET_BIG_SYM bfd_elf32_i370_vec
1364 #define TARGET_BIG_NAME "elf32-i370"
1365 #define ELF_ARCH bfd_arch_i370
1366 #define ELF_MACHINE_CODE EM_S370
1368 #define ELF_MACHINE_ALT1 EM_I370_OLD
1370 #define ELF_MAXPAGESIZE 0x1000
1371 #define ELF_OSABI ELFOSABI_GNU
1373 #define elf_info_to_howto i370_elf_info_to_howto
1375 #define elf_backend_plt_not_loaded 1
1376 #define elf_backend_rela_normal 1
1378 #define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup
1379 #define bfd_elf32_bfd_reloc_name_lookup i370_elf_reloc_name_lookup
1380 #define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags
1381 #define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data
1382 #define elf_backend_relocate_section i370_elf_relocate_section
1384 /* Dynamic loader support is mostly broken; just enough here to be able to
1385 link glibc's ld.so without errors. */
1386 #define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections
1387 #define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections
1388 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
1389 #define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections
1390 #define elf_backend_fake_sections i370_elf_fake_sections
1391 #define elf_backend_section_from_shdr i370_elf_section_from_shdr
1392 #define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol
1393 #define elf_backend_check_relocs i370_elf_check_relocs
1394 #define elf_backend_post_process_headers _bfd_elf_set_osabi
1402 #define elf_backend_finish_dynamic_symbol \
1404 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \
1405 Elf_Internal_Sym *)) i370_noop
1407 #include "elf32-target.h"