1 /* i370-specific support for 32-bit ELF
2 Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005
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,
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 /* The name of the dynamic interpreter. This is put in the .interp
273 #define ELF_DYNAMIC_INTERPRETER "/lib/ld.so"
275 /* Set the howto pointer for an i370 ELF reloc. */
278 i370_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
280 Elf_Internal_Rela *dst)
282 if (!i370_elf_howto_table[ R_I370_ADDR31 ])
283 /* Initialize howto table. */
284 i370_elf_howto_init ();
286 BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max);
287 cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)];
290 /* Hack alert -- the following several routines look generic to me ...
291 why are we bothering with them ? */
292 /* Function to set whether a module needs the -mrelocatable bit set. */
295 i370_elf_set_private_flags (bfd *abfd, flagword flags)
297 BFD_ASSERT (!elf_flags_init (abfd)
298 || elf_elfheader (abfd)->e_flags == flags);
300 elf_elfheader (abfd)->e_flags = flags;
301 elf_flags_init (abfd) = TRUE;
305 /* Merge backend specific data from an object file to the output
306 object file when linking. */
309 i370_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
314 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
315 || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
318 new_flags = elf_elfheader (ibfd)->e_flags;
319 old_flags = elf_elfheader (obfd)->e_flags;
320 if (!elf_flags_init (obfd)) /* First call, no flags set. */
322 elf_flags_init (obfd) = TRUE;
323 elf_elfheader (obfd)->e_flags = new_flags;
326 else if (new_flags == old_flags) /* Compatible flags are ok. */
329 else /* Incompatible flags. */
331 (*_bfd_error_handler)
332 ("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)",
333 ibfd, (long) new_flags, (long) old_flags);
335 bfd_set_error (bfd_error_bad_value);
342 /* Handle an i370 specific section when reading an object file. This
343 is called when elfcode.h finds a section with an unknown type. */
344 /* XXX hack alert bogus This routine is mostly all junk and almost
345 certainly does the wrong thing. Its here simply because it does
346 just enough to allow glibc-2.1 ld.so to compile & link. */
349 i370_elf_section_from_shdr (bfd *abfd,
350 Elf_Internal_Shdr *hdr,
357 if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex))
360 newsect = hdr->bfd_section;
361 flags = bfd_get_section_flags (abfd, newsect);
362 if (hdr->sh_flags & SHF_EXCLUDE)
363 flags |= SEC_EXCLUDE;
365 if (hdr->sh_type == SHT_ORDERED)
366 flags |= SEC_SORT_ENTRIES;
368 bfd_set_section_flags (abfd, newsect, flags);
372 /* Set up any other section flags and such that may be necessary. */
373 /* XXX hack alert bogus This routine is mostly all junk and almost
374 certainly does the wrong thing. Its here simply because it does
375 just enough to allow glibc-2.1 ld.so to compile & link. */
378 i370_elf_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
379 Elf_Internal_Shdr *shdr,
382 if ((asect->flags & SEC_EXCLUDE) != 0)
383 shdr->sh_flags |= SHF_EXCLUDE;
385 if ((asect->flags & SEC_SORT_ENTRIES) != 0)
386 shdr->sh_type = SHT_ORDERED;
391 /* We have to create .dynsbss and .rela.sbss here so that they get mapped
392 to output sections (just like _bfd_elf_create_dynamic_sections has
393 to create .dynbss and .rela.bss). */
394 /* XXX hack alert bogus This routine is mostly all junk and almost
395 certainly does the wrong thing. Its here simply because it does
396 just enough to allow glibc-2.1 ld.so to compile & link. */
399 i370_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
404 if (!_bfd_elf_create_dynamic_sections(abfd, info))
407 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
408 | SEC_LINKER_CREATED);
410 s = bfd_make_section_with_flags (abfd, ".dynsbss",
411 SEC_ALLOC | SEC_LINKER_CREATED);
417 s = bfd_make_section_with_flags (abfd, ".rela.sbss",
418 flags | SEC_READONLY);
420 || ! bfd_set_section_alignment (abfd, s, 2))
424 /* XXX beats me, seem to need a rela.text ... */
425 s = bfd_make_section_with_flags (abfd, ".rela.text",
426 flags | SEC_READONLY);
428 || ! bfd_set_section_alignment (abfd, s, 2))
433 /* Adjust a symbol defined by a dynamic object and referenced by a
434 regular object. The current definition is in some section of the
435 dynamic object, but we're not including those sections. We have to
436 change the definition to something the rest of the link can
438 /* XXX hack alert bogus This routine is mostly all junk and almost
439 certainly does the wrong thing. Its here simply because it does
440 just enough to allow glibc-2.1 ld.so to compile & link. */
443 i370_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
444 struct elf_link_hash_entry *h)
446 bfd *dynobj = elf_hash_table (info)->dynobj;
448 unsigned int power_of_two;
451 fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n",
452 h->root.root.string);
455 /* Make sure we know what is going on here. */
456 BFD_ASSERT (dynobj != NULL
458 || h->u.weakdef != NULL
461 && !h->def_regular)));
463 s = bfd_get_section_by_name (dynobj, ".rela.text");
464 BFD_ASSERT (s != NULL);
465 s->size += sizeof (Elf32_External_Rela);
467 /* If this is a weak symbol, and there is a real definition, the
468 processor independent code will have arranged for us to see the
469 real definition first, and we can just use the same value. */
470 if (h->u.weakdef != NULL)
472 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
473 || h->u.weakdef->root.type == bfd_link_hash_defweak);
474 h->root.u.def.section = h->u.weakdef->root.u.def.section;
475 h->root.u.def.value = h->u.weakdef->root.u.def.value;
479 /* This is a reference to a symbol defined by a dynamic object which
480 is not a function. */
482 /* If we are creating a shared library, we must presume that the
483 only references to the symbol are via the global offset table.
484 For such cases we need not do anything here; the relocations will
485 be handled correctly by relocate_section. */
489 /* We must allocate the symbol in our .dynbss section, which will
490 become part of the .bss section of the executable. There will be
491 an entry for this symbol in the .dynsym section. The dynamic
492 object will contain position independent code, so all references
493 from the dynamic object to this symbol will go through the global
494 offset table. The dynamic linker will use the .dynsym entry to
495 determine the address it must put in the global offset table, so
496 both the dynamic object and the regular object will refer to the
497 same memory location for the variable.
499 Of course, if the symbol is sufficiently small, we must instead
500 allocate it in .sbss. FIXME: It would be better to do this if and
501 only if there were actually SDAREL relocs for that symbol. */
503 if (h->size <= elf_gp_size (dynobj))
504 s = bfd_get_section_by_name (dynobj, ".dynsbss");
506 s = bfd_get_section_by_name (dynobj, ".dynbss");
507 BFD_ASSERT (s != NULL);
509 /* We must generate a R_I370_COPY reloc to tell the dynamic linker to
510 copy the initial value out of the dynamic object and into the
511 runtime process image. We need to remember the offset into the
512 .rela.bss section we are going to use. */
513 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
517 if (h->size <= elf_gp_size (dynobj))
518 srel = bfd_get_section_by_name (dynobj, ".rela.sbss");
520 srel = bfd_get_section_by_name (dynobj, ".rela.bss");
521 BFD_ASSERT (srel != NULL);
522 srel->size += sizeof (Elf32_External_Rela);
526 /* We need to figure out the alignment required for this symbol. I
527 have no idea how ELF linkers handle this. */
528 power_of_two = bfd_log2 (h->size);
529 if (power_of_two > 4)
532 /* Apply the required alignment. */
533 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
534 if (power_of_two > bfd_get_section_alignment (dynobj, s))
536 if (! bfd_set_section_alignment (dynobj, s, power_of_two))
540 /* Define the symbol as being at this point in the section. */
541 h->root.u.def.section = s;
542 h->root.u.def.value = s->size;
544 /* Increment the section size to make room for the symbol. */
550 /* Increment the index of a dynamic symbol by a given amount. Called
551 via elf_link_hash_traverse. */
552 /* XXX hack alert bogus This routine is mostly all junk and almost
553 certainly does the wrong thing. Its here simply because it does
554 just enough to allow glibc-2.1 ld.so to compile & link. */
557 i370_elf_adjust_dynindx (struct elf_link_hash_entry *h, void * cparg)
559 int *cp = (int *) cparg;
563 "i370_elf_adjust_dynindx called, h->dynindx = %d, *cp = %d\n",
567 if (h->root.type == bfd_link_hash_warning)
568 h = (struct elf_link_hash_entry *) h->root.u.i.link;
570 if (h->dynindx != -1)
576 /* Set the sizes of the dynamic sections. */
577 /* XXX hack alert bogus This routine is mostly all junk and almost
578 certainly does the wrong thing. Its here simply because it does
579 just enough to allow glibc-2.1 ld.so to compile & link. */
582 i370_elf_size_dynamic_sections (bfd *output_bfd,
583 struct bfd_link_info *info)
592 fprintf (stderr, "i370_elf_size_dynamic_sections called\n");
595 dynobj = elf_hash_table (info)->dynobj;
596 BFD_ASSERT (dynobj != NULL);
598 if (elf_hash_table (info)->dynamic_sections_created)
600 /* Set the contents of the .interp section to the interpreter. */
601 if (info->executable)
603 s = bfd_get_section_by_name (dynobj, ".interp");
604 BFD_ASSERT (s != NULL);
605 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
606 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
611 /* We may have created entries in the .rela.got, .rela.sdata, and
612 .rela.sdata2 sections. However, if we are not creating the
613 dynamic sections, we will not actually use these entries. Reset
614 the size of .rela.got, et al, which will cause it to get
615 stripped from the output file below. */
616 static char *rela_sections[] = { ".rela.got", ".rela.sdata",
617 ".rela.sdata2", ".rela.sbss",
621 for (p = rela_sections; *p != NULL; p++)
623 s = bfd_get_section_by_name (dynobj, *p);
629 /* The check_relocs and adjust_dynamic_symbol entry points have
630 determined the sizes of the various dynamic sections. Allocate
635 for (s = dynobj->sections; s != NULL; s = s->next)
639 if ((s->flags & SEC_LINKER_CREATED) == 0)
642 /* It's OK to base decisions on the section name, because none
643 of the dynobj section names depend upon the input files. */
644 name = bfd_get_section_name (dynobj, s);
646 if (strcmp (name, ".plt") == 0)
648 /* Remember whether there is a PLT. */
651 else if (strncmp (name, ".rela", 5) == 0)
658 /* Remember whether there are any relocation sections. */
661 /* If this relocation section applies to a read only
662 section, then we probably need a DT_TEXTREL entry. */
663 outname = bfd_get_section_name (output_bfd,
665 target = bfd_get_section_by_name (output_bfd, outname + 5);
667 && (target->flags & SEC_READONLY) != 0
668 && (target->flags & SEC_ALLOC) != 0)
671 /* We use the reloc_count field as a counter if we need
672 to copy relocs into the output file. */
676 else if (strcmp (name, ".got") != 0
677 && strcmp (name, ".sdata") != 0
678 && strcmp (name, ".sdata2") != 0
679 && strcmp (name, ".dynbss") != 0
680 && strcmp (name, ".dynsbss") != 0)
682 /* It's not one of our sections, so don't allocate space. */
688 /* If we don't need this section, strip it from the
689 output file. This is mostly to handle .rela.bss and
690 .rela.plt. We must create both sections in
691 create_dynamic_sections, because they must be created
692 before the linker maps input sections to output
693 sections. The linker does that before
694 adjust_dynamic_symbol is called, and it is that
695 function which decides whether anything needs to go
696 into these sections. */
697 s->flags |= SEC_EXCLUDE;
701 if ((s->flags & SEC_HAS_CONTENTS) == 0)
704 /* Allocate memory for the section contents. */
705 s->contents = bfd_zalloc (dynobj, s->size);
706 if (s->contents == NULL)
710 if (elf_hash_table (info)->dynamic_sections_created)
712 /* Add some entries to the .dynamic section. We fill in the
713 values later, in i370_elf_finish_dynamic_sections, but we
714 must add the entries now so that we get the correct size for
715 the .dynamic section. The DT_DEBUG entry is filled in by the
716 dynamic linker and used by the debugger. */
717 #define add_dynamic_entry(TAG, VAL) \
718 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
722 if (!add_dynamic_entry (DT_DEBUG, 0))
728 if (!add_dynamic_entry (DT_PLTGOT, 0)
729 || !add_dynamic_entry (DT_PLTRELSZ, 0)
730 || !add_dynamic_entry (DT_PLTREL, DT_RELA)
731 || !add_dynamic_entry (DT_JMPREL, 0))
737 if (!add_dynamic_entry (DT_RELA, 0)
738 || !add_dynamic_entry (DT_RELASZ, 0)
739 || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela)))
745 if (!add_dynamic_entry (DT_TEXTREL, 0))
747 info->flags |= DF_TEXTREL;
750 #undef add_dynamic_entry
752 /* If we are generating a shared library, we generate a section
753 symbol for each output section. These are local symbols, which
754 means that they must come first in the dynamic symbol table.
755 That means we must increment the dynamic symbol index of every
756 other dynamic symbol.
758 FIXME: We assume that there will never be relocations to
759 locations in linker-created sections that do not have
760 externally-visible names. Instead, we should work out precisely
761 which sections relocations are targeted at. */
766 for (c = 0, s = output_bfd->sections; s != NULL; s = s->next)
768 if ((s->flags & SEC_LINKER_CREATED) != 0
769 || (s->flags & SEC_ALLOC) == 0)
771 elf_section_data (s)->dynindx = -1;
775 /* These symbols will have no names, so we don't need to
776 fiddle with dynstr_index. */
778 elf_section_data (s)->dynindx = c + 1;
783 elf_link_hash_traverse (elf_hash_table (info),
784 i370_elf_adjust_dynindx, & c);
785 elf_hash_table (info)->dynsymcount += c;
791 /* Look through the relocs for a section during the first phase, and
792 allocate space in the global offset table or procedure linkage
794 /* XXX hack alert bogus This routine is mostly all junk and almost
795 certainly does the wrong thing. Its here simply because it does
796 just enough to allow glibc-2.1 ld.so to compile & link. */
799 i370_elf_check_relocs (bfd *abfd,
800 struct bfd_link_info *info,
802 const Elf_Internal_Rela *relocs)
805 Elf_Internal_Shdr *symtab_hdr;
806 struct elf_link_hash_entry **sym_hashes;
807 const Elf_Internal_Rela *rel;
808 const Elf_Internal_Rela *rel_end;
809 bfd_vma *local_got_offsets;
812 if (info->relocatable)
816 _bfd_error_handler ("i370_elf_check_relocs called for section %A in %B",
820 dynobj = elf_hash_table (info)->dynobj;
821 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
822 sym_hashes = elf_sym_hashes (abfd);
823 local_got_offsets = elf_local_got_offsets (abfd);
827 rel_end = relocs + sec->reloc_count;
828 for (rel = relocs; rel < rel_end; rel++)
830 unsigned long r_symndx;
831 struct elf_link_hash_entry *h;
833 r_symndx = ELF32_R_SYM (rel->r_info);
834 if (r_symndx < symtab_hdr->sh_info)
838 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
839 while (h->root.type == bfd_link_hash_indirect
840 || h->root.type == bfd_link_hash_warning)
841 h = (struct elf_link_hash_entry *) h->root.u.i.link;
848 "i370_elf_check_relocs needs to create relocation for %s\n",
849 (h && h->root.root.string)
850 ? h->root.root.string : "<unknown>");
856 name = (bfd_elf_string_from_elf_section
858 elf_elfheader (abfd)->e_shstrndx,
859 elf_section_data (sec)->rel_hdr.sh_name));
863 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
864 && strcmp (bfd_get_section_name (abfd, sec), name + 5) == 0);
866 sreloc = bfd_get_section_by_name (dynobj, name);
871 flags = (SEC_HAS_CONTENTS | SEC_READONLY
872 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
873 if ((sec->flags & SEC_ALLOC) != 0)
874 flags |= SEC_ALLOC | SEC_LOAD;
875 sreloc = bfd_make_section_with_flags (dynobj, name,
878 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
883 sreloc->size += sizeof (Elf32_External_Rela);
885 /* FIXME: We should here do what the m68k and i386
886 backends do: if the reloc is pc-relative, record it
887 in case it turns out that the reloc is unnecessary
888 because the symbol is forced local by versioning or
889 we are linking with -Bdynamic. Fortunately this
890 case is not frequent. */
897 /* Finish up the dynamic sections. */
898 /* XXX hack alert bogus This routine is mostly all junk and almost
899 certainly does the wrong thing. Its here simply because it does
900 just enough to allow glibc-2.1 ld.so to compile & link. */
903 i370_elf_finish_dynamic_sections (bfd *output_bfd,
904 struct bfd_link_info *info)
907 bfd *dynobj = elf_hash_table (info)->dynobj;
908 asection *sgot = bfd_get_section_by_name (dynobj, ".got");
911 fprintf (stderr, "i370_elf_finish_dynamic_sections called\n");
914 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
916 if (elf_hash_table (info)->dynamic_sections_created)
919 Elf32_External_Dyn *dyncon, *dynconend;
921 splt = bfd_get_section_by_name (dynobj, ".plt");
922 BFD_ASSERT (splt != NULL && sdyn != NULL);
924 dyncon = (Elf32_External_Dyn *) sdyn->contents;
925 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
926 for (; dyncon < dynconend; dyncon++)
928 Elf_Internal_Dyn dyn;
932 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
936 case DT_PLTGOT: name = ".plt"; size = FALSE; break;
937 case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break;
938 case DT_JMPREL: name = ".rela.plt"; size = FALSE; break;
939 default: name = NULL; size = FALSE; break;
946 s = bfd_get_section_by_name (output_bfd, name);
952 dyn.d_un.d_ptr = s->vma;
954 dyn.d_un.d_val = s->size;
956 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
961 if (sgot && sgot->size != 0)
963 unsigned char *contents = sgot->contents;
966 bfd_put_32 (output_bfd, (bfd_vma) 0, contents);
968 bfd_put_32 (output_bfd,
969 sdyn->output_section->vma + sdyn->output_offset,
972 elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;
979 Elf_Internal_Sym sym;
982 /* Set up the section symbols for the output sections. */
984 sdynsym = bfd_get_section_by_name (dynobj, ".dynsym");
985 BFD_ASSERT (sdynsym != NULL);
989 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
992 for (s = output_bfd->sections; s != NULL; s = s->next)
995 Elf32_External_Sym *esym;
997 sym.st_value = s->vma;
999 indx = elf_section_data (s)->this_idx;
1000 dindx = elf_section_data (s)->dynindx;
1003 BFD_ASSERT(indx > 0);
1004 BFD_ASSERT(dindx > 0);
1006 if (dindx > maxdindx)
1009 sym.st_shndx = indx;
1011 esym = (Elf32_External_Sym *) sdynsym->contents + dindx;
1012 bfd_elf32_swap_symbol_out (output_bfd, &sym, esym, NULL);
1016 /* Set the sh_info field of the output .dynsym section to the
1017 index of the first global symbol. */
1018 elf_section_data (sdynsym->output_section)->this_hdr.sh_info =
1025 /* The RELOCATE_SECTION function is called by the ELF backend linker
1026 to handle the relocations for a section.
1028 The relocs are always passed as Rela structures; if the section
1029 actually uses Rel structures, the r_addend field will always be
1032 This function is responsible for adjust the section contents as
1033 necessary, and (if using Rela relocs and generating a
1034 relocatable output file) adjusting the reloc addend as
1037 This function does not have to worry about setting the reloc
1038 address or the reloc symbol index.
1040 LOCAL_SYMS is a pointer to the swapped in local symbols.
1042 LOCAL_SECTIONS is an array giving the section in the input file
1043 corresponding to the st_shndx field of each local symbol.
1045 The global hash table entry for the global symbols can be found
1046 via elf_sym_hashes (input_bfd).
1048 When generating relocatable output, this function must handle
1049 STB_LOCAL/STT_SECTION symbols specially. The output symbol is
1050 going to be the section symbol corresponding to the output
1051 section, which means that the addend must be adjusted
1055 i370_elf_relocate_section (bfd *output_bfd,
1056 struct bfd_link_info *info,
1058 asection *input_section,
1060 Elf_Internal_Rela *relocs,
1061 Elf_Internal_Sym *local_syms,
1062 asection **local_sections)
1064 Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1065 struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd);
1066 bfd *dynobj = elf_hash_table (info)->dynobj;
1067 Elf_Internal_Rela *rel = relocs;
1068 Elf_Internal_Rela *relend = relocs + input_section->reloc_count;
1069 asection *sreloc = NULL;
1070 bfd_vma *local_got_offsets;
1071 bfd_boolean ret = TRUE;
1073 if (info->relocatable)
1077 _bfd_error_handler ("i370_elf_relocate_section called for %B section %A, %ld relocations%s",
1078 input_bfd, input_section,
1079 (long) input_section->reloc_count,
1080 (info->relocatable) ? " (relocatable)" : "");
1083 if (!i370_elf_howto_table[ R_I370_ADDR31 ])
1084 /* Initialize howto table if needed. */
1085 i370_elf_howto_init ();
1087 local_got_offsets = elf_local_got_offsets (input_bfd);
1089 for (; rel < relend; rel++)
1091 enum i370_reloc_type r_type = (enum i370_reloc_type) ELF32_R_TYPE (rel->r_info);
1092 bfd_vma offset = rel->r_offset;
1093 bfd_vma addend = rel->r_addend;
1094 bfd_reloc_status_type r = bfd_reloc_other;
1095 Elf_Internal_Sym *sym = NULL;
1096 asection *sec = NULL;
1097 struct elf_link_hash_entry * h = NULL;
1098 const char *sym_name = NULL;
1099 reloc_howto_type *howto;
1100 unsigned long r_symndx;
1103 /* Unknown relocation handling. */
1104 if ((unsigned) r_type >= (unsigned) R_I370_max
1105 || !i370_elf_howto_table[(int)r_type])
1107 (*_bfd_error_handler) ("%B: unknown relocation type %d",
1111 bfd_set_error (bfd_error_bad_value);
1116 howto = i370_elf_howto_table[(int) r_type];
1117 r_symndx = ELF32_R_SYM (rel->r_info);
1119 if (r_symndx < symtab_hdr->sh_info)
1121 sym = local_syms + r_symndx;
1122 sec = local_sections[r_symndx];
1123 sym_name = "<local symbol>";
1125 relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel);
1126 addend = rel->r_addend;
1130 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1131 while (h->root.type == bfd_link_hash_indirect
1132 || h->root.type == bfd_link_hash_warning)
1133 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1134 sym_name = h->root.root.string;
1135 if (h->root.type == bfd_link_hash_defined
1136 || h->root.type == bfd_link_hash_defweak)
1138 sec = h->root.u.def.section;
1140 && ((! info->symbolic && h->dynindx != -1)
1142 && (input_section->flags & SEC_ALLOC) != 0
1143 && (r_type == R_I370_ADDR31
1144 || r_type == R_I370_COPY
1145 || r_type == R_I370_ADDR16
1146 || r_type == R_I370_RELATIVE))
1147 /* In these cases, we don't need the relocation
1148 value. We check specially because in some
1149 obscure cases sec->output_section will be NULL. */
1152 relocation = (h->root.u.def.value
1153 + sec->output_section->vma
1154 + sec->output_offset);
1156 else if (h->root.type == bfd_link_hash_undefweak)
1158 else if (info->unresolved_syms_in_objects == RM_IGNORE
1159 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
1163 if ((*info->callbacks->undefined_symbol)
1164 (info, h->root.root.string, input_bfd,
1165 input_section, rel->r_offset,
1166 (info->unresolved_syms_in_objects == RM_GENERATE_ERROR
1167 || ELF_ST_VISIBILITY (h->other))))
1176 switch ((int) r_type)
1179 (*_bfd_error_handler)
1180 ("%B: unknown relocation type %d for symbol %s",
1181 input_bfd, (int) r_type, sym_name);
1183 bfd_set_error (bfd_error_bad_value);
1187 case (int) R_I370_NONE:
1190 /* Relocations that may need to be propagated if this is a shared
1192 case (int) R_I370_REL31:
1193 /* If these relocations are not to a named symbol, they can be
1194 handled right here, no need to bother the dynamic linker. */
1196 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
1200 /* Relocations that always need to be propagated if this is a shared
1202 case (int) R_I370_ADDR31:
1203 case (int) R_I370_ADDR16:
1207 Elf_Internal_Rela outrel;
1213 "i370_elf_relocate_section needs to create relocation for %s\n",
1214 (h && h->root.root.string) ? h->root.root.string : "<unknown>");
1217 /* When generating a shared object, these relocations
1218 are copied into the output file to be resolved at run
1225 name = (bfd_elf_string_from_elf_section
1227 elf_elfheader (input_bfd)->e_shstrndx,
1228 elf_section_data (input_section)->rel_hdr.sh_name));
1232 BFD_ASSERT (strncmp (name, ".rela", 5) == 0
1233 && strcmp (bfd_get_section_name (input_bfd,
1237 sreloc = bfd_get_section_by_name (dynobj, name);
1238 BFD_ASSERT (sreloc != NULL);
1244 _bfd_elf_section_offset (output_bfd, info, input_section,
1246 if (outrel.r_offset == (bfd_vma) -1
1247 || outrel.r_offset == (bfd_vma) -2)
1248 skip = (int) outrel.r_offset;
1249 outrel.r_offset += (input_section->output_section->vma
1250 + input_section->output_offset);
1253 memset (&outrel, 0, sizeof outrel);
1254 /* h->dynindx may be -1 if this symbol was marked to
1257 && ((! info->symbolic && h->dynindx != -1)
1258 || !h->def_regular))
1260 BFD_ASSERT (h->dynindx != -1);
1261 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
1262 outrel.r_addend = rel->r_addend;
1266 if (r_type == R_I370_ADDR31)
1268 outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE);
1269 outrel.r_addend = relocation + rel->r_addend;
1275 if (bfd_is_abs_section (sec))
1277 else if (sec == NULL || sec->owner == NULL)
1279 bfd_set_error (bfd_error_bad_value);
1286 osec = sec->output_section;
1287 indx = elf_section_data (osec)->dynindx;
1288 BFD_ASSERT(indx > 0);
1292 printf ("indx=%d section=%s flags=%08x name=%s\n",
1293 indx, osec->name, osec->flags,
1294 h->root.root.string);
1299 outrel.r_info = ELF32_R_INFO (indx, r_type);
1300 outrel.r_addend = relocation + rel->r_addend;
1304 loc = sreloc->contents;
1305 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela);
1306 bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc);
1308 /* This reloc will be computed at runtime, so there's no
1309 need to do anything now, unless this is a RELATIVE
1310 reloc in an unallocated section. */
1312 || (input_section->flags & SEC_ALLOC) != 0
1313 || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE)
1318 case (int) R_I370_COPY:
1319 case (int) R_I370_RELATIVE:
1320 (*_bfd_error_handler)
1321 ("%B: Relocation %s is not yet supported for symbol %s.",
1323 i370_elf_howto_table[(int) r_type]->name,
1326 bfd_set_error (bfd_error_invalid_operation);
1332 fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n",
1341 r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents,
1342 offset, relocation, addend);
1344 if (r != bfd_reloc_ok)
1352 case bfd_reloc_overflow:
1360 name = bfd_elf_string_from_elf_section (input_bfd,
1361 symtab_hdr->sh_link,
1367 name = bfd_section_name (input_bfd, sec);
1370 (*info->callbacks->reloc_overflow) (info,
1371 (h ? &h->root : NULL),
1385 fprintf (stderr, "\n");
1392 i370_elf_post_process_headers (bfd * abfd,
1393 struct bfd_link_info * link_info ATTRIBUTE_UNUSED)
1395 Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */
1397 i_ehdrp = elf_elfheader (abfd);
1398 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_LINUX;
1401 #define TARGET_BIG_SYM bfd_elf32_i370_vec
1402 #define TARGET_BIG_NAME "elf32-i370"
1403 #define ELF_ARCH bfd_arch_i370
1404 #define ELF_MACHINE_CODE EM_S370
1406 #define ELF_MACHINE_ALT1 EM_I370_OLD
1408 #define ELF_MAXPAGESIZE 0x1000
1409 #define elf_info_to_howto i370_elf_info_to_howto
1411 #define elf_backend_plt_not_loaded 1
1412 #define elf_backend_rela_normal 1
1414 #define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup
1415 #define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags
1416 #define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data
1417 #define elf_backend_relocate_section i370_elf_relocate_section
1419 /* Dynamic loader support is mostly broken; just enough here to be able to
1420 link glibc's ld.so without errors. */
1421 #define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections
1422 #define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections
1423 #define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections
1424 #define elf_backend_fake_sections i370_elf_fake_sections
1425 #define elf_backend_section_from_shdr i370_elf_section_from_shdr
1426 #define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol
1427 #define elf_backend_check_relocs i370_elf_check_relocs
1428 #define elf_backend_post_process_headers i370_elf_post_process_headers
1436 /* We need to define these at least as no-ops to link glibc ld.so. */
1438 #define elf_backend_add_symbol_hook \
1440 (bfd *, struct bfd_link_info *, Elf_Internal_Sym *, \
1441 const char **, flagword *, asection **, bfd_vma *)) i370_noop
1442 #define elf_backend_finish_dynamic_symbol \
1444 (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \
1445 Elf_Internal_Sym *)) i370_noop
1446 #define elf_backend_additional_program_headers \
1447 (int (*) (bfd *)) i370_noop
1448 #define elf_backend_modify_segment_map \
1449 (bfd_boolean (*) (bfd *, struct bfd_link_info *)) i370_noop
1451 #include "elf32-target.h"