diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-i370.c')
-rw-r--r-- | binutils-2.25/bfd/elf32-i370.c | 1404 |
1 files changed, 1404 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-i370.c b/binutils-2.25/bfd/elf32-i370.c new file mode 100644 index 0000000..48e25f2 --- /dev/null +++ b/binutils-2.25/bfd/elf32-i370.c @@ -0,0 +1,1404 @@ +/* i370-specific support for 32-bit ELF + Copyright 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, + 2005, 2006, 2007, 2008, 2010, 2011, 2012 Free Software Foundation, Inc. + Written by Ian Lance Taylor, Cygnus Support. + Hacked by Linas Vepstas for i370 linas@linas.org + + This file is part of BFD, the Binary File Descriptor library. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + +/* This file is based on a preliminary PowerPC ELF ABI. + But its been hacked on for the IBM 360/370 architectures. + Basically, the 31bit relocation works, and just about everything + else is a wild card. In particular, don't expect shared libs or + dynamic loading to work ... its never been tested. */ + +#include "sysdep.h" +#include "bfd.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf/i370.h" + +static reloc_howto_type *i370_elf_howto_table[ (int)R_I370_max ]; + +static reloc_howto_type i370_elf_howto_raw[] = +{ + /* This reloc does nothing. */ + HOWTO (R_I370_NONE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_NONE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A standard 31 bit relocation. */ + HOWTO (R_I370_ADDR31, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 31, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_ADDR31", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x7fffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A standard 32 bit relocation. */ + HOWTO (R_I370_ADDR32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_ADDR32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* A standard 16 bit relocation. */ + HOWTO (R_I370_ADDR16, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 16, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_ADDR16", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* 31-bit PC relative. */ + HOWTO (R_I370_REL31, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 31, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_REL31", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0x7fffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* 32-bit PC relative. */ + HOWTO (R_I370_REL32, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_REL32", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A standard 12 bit relocation. */ + HOWTO (R_I370_ADDR12, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 12, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_ADDR12", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xfff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* 12-bit PC relative. */ + HOWTO (R_I370_REL12, /* type */ + 0, /* rightshift */ + 1, /* size (0 = byte, 1 = short, 2 = long) */ + 12, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_REL12", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xfff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* A standard 8 bit relocation. */ + HOWTO (R_I370_ADDR8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_ADDR8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* 8-bit PC relative. */ + HOWTO (R_I370_REL8, /* type */ + 0, /* rightshift */ + 0, /* size (0 = byte, 1 = short, 2 = long) */ + 8, /* bitsize */ + TRUE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_REL8", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xff, /* dst_mask */ + TRUE), /* pcrel_offset */ + + /* This is used only by the dynamic linker. The symbol should exist + both in the object being run and in some shared library. The + dynamic linker copies the data addressed by the symbol from the + shared library into the object, because the object being + run has to have the data at some particular address. */ + HOWTO (R_I370_COPY, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_COPY", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0, /* dst_mask */ + FALSE), /* pcrel_offset */ + + /* Used only by the dynamic linker. When the object is run, this + longword is set to the load address of the object, plus the + addend. */ + HOWTO (R_I370_RELATIVE, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_bitfield, /* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_I370_RELATIVE", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ + +}; + +/* Initialize the i370_elf_howto_table, so that linear accesses can be done. */ + +static void +i370_elf_howto_init (void) +{ + unsigned int i, type; + + for (i = 0; i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]); i++) + { + type = i370_elf_howto_raw[i].type; + BFD_ASSERT (type < sizeof (i370_elf_howto_table) / sizeof (i370_elf_howto_table[0])); + i370_elf_howto_table[type] = &i370_elf_howto_raw[i]; + } +} + +static reloc_howto_type * +i370_elf_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, + bfd_reloc_code_real_type code) +{ + enum i370_reloc_type i370_reloc = R_I370_NONE; + + if (!i370_elf_howto_table[ R_I370_ADDR31 ]) + /* Initialize howto table if needed. */ + i370_elf_howto_init (); + + switch ((int) code) + { + default: + return NULL; + + case BFD_RELOC_NONE: i370_reloc = R_I370_NONE; break; + case BFD_RELOC_32: i370_reloc = R_I370_ADDR31; break; + case BFD_RELOC_16: i370_reloc = R_I370_ADDR16; break; + case BFD_RELOC_32_PCREL: i370_reloc = R_I370_REL31; break; + case BFD_RELOC_CTOR: i370_reloc = R_I370_ADDR31; break; + case BFD_RELOC_I370_D12: i370_reloc = R_I370_ADDR12; break; + } + + return i370_elf_howto_table[ (int)i370_reloc ]; +}; + +static reloc_howto_type * +i370_elf_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, + const char *r_name) +{ + unsigned int i; + + for (i = 0; + i < sizeof (i370_elf_howto_raw) / sizeof (i370_elf_howto_raw[0]); + i++) + if (i370_elf_howto_raw[i].name != NULL + && strcasecmp (i370_elf_howto_raw[i].name, r_name) == 0) + return &i370_elf_howto_raw[i]; + + return NULL; +} + +/* The name of the dynamic interpreter. This is put in the .interp + section. */ + +#define ELF_DYNAMIC_INTERPRETER "/lib/ld.so" + +/* Set the howto pointer for an i370 ELF reloc. */ + +static void +i370_elf_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, + arelent *cache_ptr, + Elf_Internal_Rela *dst) +{ + if (!i370_elf_howto_table[ R_I370_ADDR31 ]) + /* Initialize howto table. */ + i370_elf_howto_init (); + + BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_I370_max); + cache_ptr->howto = i370_elf_howto_table[ELF32_R_TYPE (dst->r_info)]; +} + +/* Hack alert -- the following several routines look generic to me ... + why are we bothering with them ? */ +/* Function to set whether a module needs the -mrelocatable bit set. */ + +static bfd_boolean +i370_elf_set_private_flags (bfd *abfd, flagword flags) +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = TRUE; + return TRUE; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +static bfd_boolean +i370_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + flagword old_flags; + flagword new_flags; + + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return TRUE; + + new_flags = elf_elfheader (ibfd)->e_flags; + old_flags = elf_elfheader (obfd)->e_flags; + if (!elf_flags_init (obfd)) /* First call, no flags set. */ + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = new_flags; + } + + else if (new_flags == old_flags) /* Compatible flags are ok. */ + ; + + else /* Incompatible flags. */ + { + (*_bfd_error_handler) + ("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)", + ibfd, (long) new_flags, (long) old_flags); + + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + return TRUE; +} + +/* Handle an i370 specific section when reading an object file. This + is called when elfcode.h finds a section with an unknown type. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_section_from_shdr (bfd *abfd, + Elf_Internal_Shdr *hdr, + const char *name, + int shindex) +{ + asection *newsect; + flagword flags; + + if (! _bfd_elf_make_section_from_shdr (abfd, hdr, name, shindex)) + return FALSE; + + newsect = hdr->bfd_section; + flags = bfd_get_section_flags (abfd, newsect); + if (hdr->sh_type == SHT_ORDERED) + flags |= SEC_SORT_ENTRIES; + + bfd_set_section_flags (abfd, newsect, flags); + return TRUE; +} + +/* Set up any other section flags and such that may be necessary. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_fake_sections (bfd *abfd ATTRIBUTE_UNUSED, + Elf_Internal_Shdr *shdr, + asection *asect) +{ + if ((asect->flags & (SEC_GROUP | SEC_EXCLUDE)) == SEC_EXCLUDE) + shdr->sh_flags |= SHF_EXCLUDE; + + if ((asect->flags & SEC_SORT_ENTRIES) != 0) + shdr->sh_type = SHT_ORDERED; + + return TRUE; +} + +/* We have to create .dynsbss and .rela.sbss here so that they get mapped + to output sections (just like _bfd_elf_create_dynamic_sections has + to create .dynbss and .rela.bss). */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) +{ + asection *s; + flagword flags; + + if (!_bfd_elf_create_dynamic_sections(abfd, info)) + return FALSE; + + flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY + | SEC_LINKER_CREATED); + + s = bfd_make_section_anyway_with_flags (abfd, ".dynsbss", + SEC_ALLOC | SEC_LINKER_CREATED); + if (s == NULL) + return FALSE; + + if (! info->shared) + { + s = bfd_make_section_anyway_with_flags (abfd, ".rela.sbss", + flags | SEC_READONLY); + if (s == NULL + || ! bfd_set_section_alignment (abfd, s, 2)) + return FALSE; + } + + /* XXX beats me, seem to need a rela.text ... */ + s = bfd_make_section_anyway_with_flags (abfd, ".rela.text", + flags | SEC_READONLY); + if (s == NULL + || ! bfd_set_section_alignment (abfd, s, 2)) + return FALSE; + return TRUE; +} + +/* Adjust a symbol defined by a dynamic object and referenced by a + regular object. The current definition is in some section of the + dynamic object, but we're not including those sections. We have to + change the definition to something the rest of the link can + understand. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_adjust_dynamic_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + bfd *dynobj = elf_hash_table (info)->dynobj; + asection *s; + +#ifdef DEBUG + fprintf (stderr, "i370_elf_adjust_dynamic_symbol called for %s\n", + h->root.root.string); +#endif + + /* Make sure we know what is going on here. */ + BFD_ASSERT (dynobj != NULL + && (h->needs_plt + || h->u.weakdef != NULL + || (h->def_dynamic + && h->ref_regular + && !h->def_regular))); + + s = bfd_get_linker_section (dynobj, ".rela.text"); + BFD_ASSERT (s != NULL); + s->size += sizeof (Elf32_External_Rela); + + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->u.weakdef != NULL) + { + BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined + || h->u.weakdef->root.type == bfd_link_hash_defweak); + h->root.u.def.section = h->u.weakdef->root.u.def.section; + h->root.u.def.value = h->u.weakdef->root.u.def.value; + return TRUE; + } + + /* This is a reference to a symbol defined by a dynamic object which + is not a function. */ + + /* If we are creating a shared library, we must presume that the + only references to the symbol are via the global offset table. + For such cases we need not do anything here; the relocations will + be handled correctly by relocate_section. */ + if (info->shared) + return TRUE; + + /* We must allocate the symbol in our .dynbss section, which will + become part of the .bss section of the executable. There will be + an entry for this symbol in the .dynsym section. The dynamic + object will contain position independent code, so all references + from the dynamic object to this symbol will go through the global + offset table. The dynamic linker will use the .dynsym entry to + determine the address it must put in the global offset table, so + both the dynamic object and the regular object will refer to the + same memory location for the variable. + + Of course, if the symbol is sufficiently small, we must instead + allocate it in .sbss. FIXME: It would be better to do this if and + only if there were actually SDAREL relocs for that symbol. */ + + if (h->size <= elf_gp_size (dynobj)) + s = bfd_get_linker_section (dynobj, ".dynsbss"); + else + s = bfd_get_linker_section (dynobj, ".dynbss"); + BFD_ASSERT (s != NULL); + + /* We must generate a R_I370_COPY reloc to tell the dynamic linker to + copy the initial value out of the dynamic object and into the + runtime process image. We need to remember the offset into the + .rela.bss section we are going to use. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0) + { + asection *srel; + + if (h->size <= elf_gp_size (dynobj)) + srel = bfd_get_linker_section (dynobj, ".rela.sbss"); + else + srel = bfd_get_linker_section (dynobj, ".rela.bss"); + BFD_ASSERT (srel != NULL); + srel->size += sizeof (Elf32_External_Rela); + h->needs_copy = 1; + } + + return _bfd_elf_adjust_dynamic_copy (h, s); +} + +/* Increment the index of a dynamic symbol by a given amount. Called + via elf_link_hash_traverse. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_adjust_dynindx (struct elf_link_hash_entry *h, void * cparg) +{ + int *cp = (int *) cparg; + +#ifdef DEBUG + fprintf (stderr, + "i370_elf_adjust_dynindx called, h->dynindx = %ld, *cp = %d\n", + h->dynindx, *cp); +#endif + + if (h->dynindx != -1) + h->dynindx += *cp; + + return TRUE; +} + +/* Set the sizes of the dynamic sections. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_size_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + bfd *dynobj; + asection *s; + bfd_boolean plt; + bfd_boolean relocs; + bfd_boolean reltext; + +#ifdef DEBUG + fprintf (stderr, "i370_elf_size_dynamic_sections called\n"); +#endif + + dynobj = elf_hash_table (info)->dynobj; + BFD_ASSERT (dynobj != NULL); + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (info->executable) + { + s = bfd_get_linker_section (dynobj, ".interp"); + BFD_ASSERT (s != NULL); + s->size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + else + { + /* We may have created entries in the .rela.got, .rela.sdata, and + .rela.sdata2 sections. However, if we are not creating the + dynamic sections, we will not actually use these entries. Reset + the size of .rela.got, et al, which will cause it to get + stripped from the output file below. */ + static char *rela_sections[] = { ".rela.got", ".rela.sdata", + ".rela.sdata2", ".rela.sbss", + NULL }; + char **p; + + for (p = rela_sections; *p != NULL; p++) + { + s = bfd_get_linker_section (dynobj, *p); + if (s != NULL) + s->size = 0; + } + } + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + plt = FALSE; + relocs = FALSE; + reltext = FALSE; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char *name; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + /* It's OK to base decisions on the section name, because none + of the dynobj section names depend upon the input files. */ + name = bfd_get_section_name (dynobj, s); + + if (strcmp (name, ".plt") == 0) + { + /* Remember whether there is a PLT. */ + plt = s->size != 0; + } + else if (CONST_STRNEQ (name, ".rela")) + { + if (s->size != 0) + { + asection *target; + const char *outname; + + /* Remember whether there are any relocation sections. */ + relocs = TRUE; + + /* If this relocation section applies to a read only + section, then we probably need a DT_TEXTREL entry. */ + outname = bfd_get_section_name (output_bfd, + s->output_section); + target = bfd_get_section_by_name (output_bfd, outname + 5); + if (target != NULL + && (target->flags & SEC_READONLY) != 0 + && (target->flags & SEC_ALLOC) != 0) + reltext = TRUE; + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else if (strcmp (name, ".got") != 0 + && strcmp (name, ".sdata") != 0 + && strcmp (name, ".sdata2") != 0 + && strcmp (name, ".dynbss") != 0 + && strcmp (name, ".dynsbss") != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (s->size == 0) + { + /* If we don't need this section, strip it from the + output file. This is mostly to handle .rela.bss and + .rela.plt. We must create both sections in + create_dynamic_sections, because they must be created + before the linker maps input sections to output + sections. The linker does that before + adjust_dynamic_symbol is called, and it is that + function which decides whether anything needs to go + into these sections. */ + s->flags |= SEC_EXCLUDE; + continue; + } + + if ((s->flags & SEC_HAS_CONTENTS) == 0) + continue; + + /* Allocate memory for the section contents. */ + s->contents = bfd_zalloc (dynobj, s->size); + if (s->contents == NULL) + return FALSE; + } + + if (elf_hash_table (info)->dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in i370_elf_finish_dynamic_sections, but we + must add the entries now so that we get the correct size for + the .dynamic section. The DT_DEBUG entry is filled in by the + dynamic linker and used by the debugger. */ +#define add_dynamic_entry(TAG, VAL) \ + _bfd_elf_add_dynamic_entry (info, TAG, VAL) + + if (!info->shared) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (plt) + { + if (!add_dynamic_entry (DT_PLTGOT, 0) + || !add_dynamic_entry (DT_PLTRELSZ, 0) + || !add_dynamic_entry (DT_PLTREL, DT_RELA) + || !add_dynamic_entry (DT_JMPREL, 0)) + return FALSE; + } + + if (relocs) + { + if (!add_dynamic_entry (DT_RELA, 0) + || !add_dynamic_entry (DT_RELASZ, 0) + || !add_dynamic_entry (DT_RELAENT, sizeof (Elf32_External_Rela))) + return FALSE; + } + + if (reltext) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return FALSE; + info->flags |= DF_TEXTREL; + } + } +#undef add_dynamic_entry + + /* If we are generating a shared library, we generate a section + symbol for each output section. These are local symbols, which + means that they must come first in the dynamic symbol table. + That means we must increment the dynamic symbol index of every + other dynamic symbol. + + FIXME: We assume that there will never be relocations to + locations in linker-created sections that do not have + externally-visible names. Instead, we should work out precisely + which sections relocations are targeted at. */ + if (info->shared) + { + int c; + + for (c = 0, s = output_bfd->sections; s != NULL; s = s->next) + { + if ((s->flags & SEC_LINKER_CREATED) != 0 + || (s->flags & SEC_ALLOC) == 0) + { + elf_section_data (s)->dynindx = -1; + continue; + } + + /* These symbols will have no names, so we don't need to + fiddle with dynstr_index. */ + + elf_section_data (s)->dynindx = c + 1; + + c++; + } + + elf_link_hash_traverse (elf_hash_table (info), + i370_elf_adjust_dynindx, & c); + elf_hash_table (info)->dynsymcount += c; + } + + return TRUE; +} + +/* Look through the relocs for a section during the first phase, and + allocate space in the global offset table or procedure linkage + table. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_check_relocs (bfd *abfd, + struct bfd_link_info *info, + asection *sec, + const Elf_Internal_Rela *relocs) +{ + bfd *dynobj; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + const Elf_Internal_Rela *rel; + const Elf_Internal_Rela *rel_end; + asection *sreloc; + + if (info->relocatable) + return TRUE; + +#ifdef DEBUG + _bfd_error_handler ("i370_elf_check_relocs called for section %A in %B", + sec, abfd); +#endif + + dynobj = elf_hash_table (info)->dynobj; + symtab_hdr = &elf_tdata (abfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (abfd); + + sreloc = NULL; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned long r_symndx; + struct elf_link_hash_entry *h; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx < symtab_hdr->sh_info) + h = NULL; + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + + if (info->shared) + { +#ifdef DEBUG + fprintf (stderr, + "i370_elf_check_relocs needs to create relocation for %s\n", + (h && h->root.root.string) + ? h->root.root.string : "<unknown>"); +#endif + if (sreloc == NULL) + { + sreloc = _bfd_elf_make_dynamic_reloc_section + (sec, dynobj, 2, abfd, /*rela?*/ TRUE); + + if (sreloc == NULL) + return FALSE; + } + + sreloc->size += sizeof (Elf32_External_Rela); + + /* FIXME: We should here do what the m68k and i386 + backends do: if the reloc is pc-relative, record it + in case it turns out that the reloc is unnecessary + because the symbol is forced local by versioning or + we are linking with -Bdynamic. Fortunately this + case is not frequent. */ + } + } + + return TRUE; +} + +/* Finish up the dynamic sections. */ +/* XXX hack alert bogus This routine is mostly all junk and almost + certainly does the wrong thing. Its here simply because it does + just enough to allow glibc-2.1 ld.so to compile & link. */ + +static bfd_boolean +i370_elf_finish_dynamic_sections (bfd *output_bfd, + struct bfd_link_info *info) +{ + asection *sdyn; + bfd *dynobj = elf_hash_table (info)->dynobj; + asection *sgot = bfd_get_linker_section (dynobj, ".got"); + +#ifdef DEBUG + fprintf (stderr, "i370_elf_finish_dynamic_sections called\n"); +#endif + + sdyn = bfd_get_linker_section (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + asection *splt; + Elf32_External_Dyn *dyncon, *dynconend; + + splt = bfd_get_linker_section (dynobj, ".plt"); + BFD_ASSERT (splt != NULL && sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + const char *name; + bfd_boolean size; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + case DT_PLTGOT: name = ".plt"; size = FALSE; break; + case DT_PLTRELSZ: name = ".rela.plt"; size = TRUE; break; + case DT_JMPREL: name = ".rela.plt"; size = FALSE; break; + default: name = NULL; size = FALSE; break; + } + + if (name != NULL) + { + asection *s; + + s = bfd_get_section_by_name (output_bfd, name); + if (s == NULL) + dyn.d_un.d_val = 0; + else + { + if (! size) + dyn.d_un.d_ptr = s->vma; + else + dyn.d_un.d_val = s->size; + } + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + } + } + } + + if (sgot && sgot->size != 0) + { + unsigned char *contents = sgot->contents; + + if (sdyn == NULL) + bfd_put_32 (output_bfd, (bfd_vma) 0, contents); + else + bfd_put_32 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + contents); + + elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; + } + + if (info->shared) + { + asection *sdynsym; + asection *s; + Elf_Internal_Sym sym; + int maxdindx = 0; + + /* Set up the section symbols for the output sections. */ + + sdynsym = bfd_get_linker_section (dynobj, ".dynsym"); + BFD_ASSERT (sdynsym != NULL); + + sym.st_size = 0; + sym.st_name = 0; + sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); + sym.st_other = 0; + sym.st_target_internal = 0; + + for (s = output_bfd->sections; s != NULL; s = s->next) + { + int indx, dindx; + Elf32_External_Sym *esym; + + sym.st_value = s->vma; + + indx = elf_section_data (s)->this_idx; + dindx = elf_section_data (s)->dynindx; + if (dindx != -1) + { + BFD_ASSERT(indx > 0); + BFD_ASSERT(dindx > 0); + + if (dindx > maxdindx) + maxdindx = dindx; + + sym.st_shndx = indx; + + esym = (Elf32_External_Sym *) sdynsym->contents + dindx; + bfd_elf32_swap_symbol_out (output_bfd, &sym, esym, NULL); + } + } + + /* Set the sh_info field of the output .dynsym section to the + index of the first global symbol. */ + elf_section_data (sdynsym->output_section)->this_hdr.sh_info = + maxdindx + 1; + } + + return TRUE; +} + +/* The RELOCATE_SECTION function is called by the ELF backend linker + to handle the relocations for a section. + + The relocs are always passed as Rela structures; if the section + actually uses Rel structures, the r_addend field will always be + zero. + + This function is responsible for adjust the section contents as + necessary, and (if using Rela relocs and generating a + relocatable output file) adjusting the reloc addend as + necessary. + + This function does not have to worry about setting the reloc + address or the reloc symbol index. + + LOCAL_SYMS is a pointer to the swapped in local symbols. + + LOCAL_SECTIONS is an array giving the section in the input file + corresponding to the st_shndx field of each local symbol. + + The global hash table entry for the global symbols can be found + via elf_sym_hashes (input_bfd). + + When generating relocatable output, this function must handle + STB_LOCAL/STT_SECTION symbols specially. The output symbol is + going to be the section symbol corresponding to the output + section, which means that the addend must be adjusted + accordingly. */ + +static bfd_boolean +i370_elf_relocate_section (bfd *output_bfd, + struct bfd_link_info *info, + bfd *input_bfd, + asection *input_section, + bfd_byte *contents, + Elf_Internal_Rela *relocs, + Elf_Internal_Sym *local_syms, + asection **local_sections) +{ + Elf_Internal_Shdr *symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + struct elf_link_hash_entry **sym_hashes = elf_sym_hashes (input_bfd); + Elf_Internal_Rela *rel = relocs; + Elf_Internal_Rela *relend = relocs + input_section->reloc_count; + asection *sreloc = NULL; + bfd_boolean ret = TRUE; + +#ifdef DEBUG + _bfd_error_handler ("i370_elf_relocate_section called for %B section %A, %ld relocations%s", + input_bfd, input_section, + (long) input_section->reloc_count, + (info->relocatable) ? " (relocatable)" : ""); +#endif + + if (!i370_elf_howto_table[ R_I370_ADDR31 ]) + /* Initialize howto table if needed. */ + i370_elf_howto_init (); + + for (; rel < relend; rel++) + { + enum i370_reloc_type r_type = (enum i370_reloc_type) ELF32_R_TYPE (rel->r_info); + bfd_vma offset = rel->r_offset; + bfd_vma addend = rel->r_addend; + bfd_reloc_status_type r = bfd_reloc_other; + Elf_Internal_Sym *sym = NULL; + asection *sec = NULL; + struct elf_link_hash_entry * h = NULL; + const char *sym_name = NULL; + reloc_howto_type *howto; + unsigned long r_symndx; + bfd_vma relocation; + + /* Unknown relocation handling. */ + if ((unsigned) r_type >= (unsigned) R_I370_max + || !i370_elf_howto_table[(int)r_type]) + { + (*_bfd_error_handler) ("%B: unknown relocation type %d", + input_bfd, + (int) r_type); + + bfd_set_error (bfd_error_bad_value); + ret = FALSE; + continue; + } + + howto = i370_elf_howto_table[(int) r_type]; + r_symndx = ELF32_R_SYM (rel->r_info); + relocation = 0; + + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + sym_name = "<local symbol>"; + + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, & sec, rel); + addend = rel->r_addend; + } + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + sym_name = h->root.root.string; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + if (info->shared + && ((! info->symbolic && h->dynindx != -1) + || !h->def_regular) + && (input_section->flags & SEC_ALLOC) != 0 + && (r_type == R_I370_ADDR31 + || r_type == R_I370_COPY + || r_type == R_I370_ADDR16 + || r_type == R_I370_RELATIVE)) + /* In these cases, we don't need the relocation + value. We check specially because in some + obscure cases sec->output_section will be NULL. */ + ; + else + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + } + else if (h->root.type == bfd_link_hash_undefweak) + ; + else if (info->unresolved_syms_in_objects == RM_IGNORE + && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) + ; + else if (!info->relocatable) + { + if ((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset, + (info->unresolved_syms_in_objects == RM_GENERATE_ERROR + || ELF_ST_VISIBILITY (h->other)))) + { + ret = FALSE; + continue; + } + } + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (info->relocatable) + continue; + + switch ((int) r_type) + { + default: + (*_bfd_error_handler) + ("%B: unknown relocation type %d for symbol %s", + input_bfd, (int) r_type, sym_name); + + bfd_set_error (bfd_error_bad_value); + ret = FALSE; + continue; + + case (int) R_I370_NONE: + continue; + + /* Relocations that may need to be propagated if this is a shared + object. */ + case (int) R_I370_REL31: + /* If these relocations are not to a named symbol, they can be + handled right here, no need to bother the dynamic linker. */ + if (h == NULL + || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) + break; + /* Fall through. */ + + /* Relocations that always need to be propagated if this is a shared + object. */ + case (int) R_I370_ADDR31: + case (int) R_I370_ADDR16: + if (info->shared + && r_symndx != STN_UNDEF) + { + Elf_Internal_Rela outrel; + bfd_byte *loc; + int skip; + +#ifdef DEBUG + fprintf (stderr, + "i370_elf_relocate_section needs to create relocation for %s\n", + (h && h->root.root.string) ? h->root.root.string : "<unknown>"); +#endif + + /* When generating a shared object, these relocations + are copied into the output file to be resolved at run + time. */ + + if (sreloc == NULL) + { + sreloc = _bfd_elf_get_dynamic_reloc_section + (input_bfd, input_section, /*rela?*/ TRUE); + if (sreloc == NULL) + return FALSE; + } + + skip = 0; + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset); + if (outrel.r_offset == (bfd_vma) -1 + || outrel.r_offset == (bfd_vma) -2) + skip = (int) outrel.r_offset; + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + memset (&outrel, 0, sizeof outrel); + /* h->dynindx may be -1 if this symbol was marked to + become local. */ + else if (h != NULL + && ((! info->symbolic && h->dynindx != -1) + || !h->def_regular)) + { + BFD_ASSERT (h->dynindx != -1); + outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); + outrel.r_addend = rel->r_addend; + } + else + { + if (r_type == R_I370_ADDR31) + { + outrel.r_info = ELF32_R_INFO (0, R_I370_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; + } + else + { + long indx; + + if (bfd_is_abs_section (sec)) + indx = 0; + else if (sec == NULL || sec->owner == NULL) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + else + { + asection *osec; + + /* We are turning this relocation into one + against a section symbol. It would be + proper to subtract the symbol's value, + osec->vma, from the emitted reloc addend, + but ld.so expects buggy relocs. */ + osec = sec->output_section; + indx = elf_section_data (osec)->dynindx; + if (indx == 0) + { + struct elf_link_hash_table *htab; + htab = elf_hash_table (info); + osec = htab->text_index_section; + indx = elf_section_data (osec)->dynindx; + } + BFD_ASSERT (indx != 0); +#ifdef DEBUG + if (indx <= 0) + { + printf ("indx=%ld section=%s flags=%08x name=%s\n", + indx, osec->name, osec->flags, + h->root.root.string); + } +#endif + } + + outrel.r_info = ELF32_R_INFO (indx, r_type); + outrel.r_addend = relocation + rel->r_addend; + } + } + + loc = sreloc->contents; + loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rela); + bfd_elf32_swap_reloca_out (output_bfd, &outrel, loc); + + /* This reloc will be computed at runtime, so there's no + need to do anything now, unless this is a RELATIVE + reloc in an unallocated section. */ + if (skip == -1 + || (input_section->flags & SEC_ALLOC) != 0 + || ELF32_R_TYPE (outrel.r_info) != R_I370_RELATIVE) + continue; + } + break; + + case (int) R_I370_COPY: + case (int) R_I370_RELATIVE: + (*_bfd_error_handler) + ("%B: Relocation %s is not yet supported for symbol %s.", + input_bfd, + i370_elf_howto_table[(int) r_type]->name, + sym_name); + + bfd_set_error (bfd_error_invalid_operation); + ret = FALSE; + continue; + } + +#ifdef DEBUG + fprintf (stderr, "\ttype = %s (%d), name = %s, symbol index = %ld, offset = %ld, addend = %ld\n", + howto->name, + (int)r_type, + sym_name, + r_symndx, + (long) offset, + (long) addend); +#endif + + r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, + offset, relocation, addend); + + if (r != bfd_reloc_ok) + { + ret = FALSE; + switch (r) + { + default: + break; + + case bfd_reloc_overflow: + { + const char *name; + + if (h != NULL) + name = NULL; + else + { + name = bfd_elf_string_from_elf_section (input_bfd, + symtab_hdr->sh_link, + sym->st_name); + if (name == NULL) + break; + + if (*name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + (*info->callbacks->reloc_overflow) (info, + (h ? &h->root : NULL), + name, + howto->name, + (bfd_vma) 0, + input_bfd, + input_section, + offset); + } + break; + } + } + } + +#ifdef DEBUG + fprintf (stderr, "\n"); +#endif + + return ret; +} + +#define TARGET_BIG_SYM bfd_elf32_i370_vec +#define TARGET_BIG_NAME "elf32-i370" +#define ELF_ARCH bfd_arch_i370 +#define ELF_MACHINE_CODE EM_S370 +#ifdef EM_I370_OLD +#define ELF_MACHINE_ALT1 EM_I370_OLD +#endif +#define ELF_MAXPAGESIZE 0x1000 +#define ELF_OSABI ELFOSABI_GNU + +#define elf_info_to_howto i370_elf_info_to_howto + +#define elf_backend_plt_not_loaded 1 +#define elf_backend_rela_normal 1 + +#define bfd_elf32_bfd_reloc_type_lookup i370_elf_reloc_type_lookup +#define bfd_elf32_bfd_reloc_name_lookup i370_elf_reloc_name_lookup +#define bfd_elf32_bfd_set_private_flags i370_elf_set_private_flags +#define bfd_elf32_bfd_merge_private_bfd_data i370_elf_merge_private_bfd_data +#define elf_backend_relocate_section i370_elf_relocate_section + +/* Dynamic loader support is mostly broken; just enough here to be able to + link glibc's ld.so without errors. */ +#define elf_backend_create_dynamic_sections i370_elf_create_dynamic_sections +#define elf_backend_size_dynamic_sections i370_elf_size_dynamic_sections +#define elf_backend_init_index_section _bfd_elf_init_1_index_section +#define elf_backend_finish_dynamic_sections i370_elf_finish_dynamic_sections +#define elf_backend_fake_sections i370_elf_fake_sections +#define elf_backend_section_from_shdr i370_elf_section_from_shdr +#define elf_backend_adjust_dynamic_symbol i370_elf_adjust_dynamic_symbol +#define elf_backend_check_relocs i370_elf_check_relocs +#define elf_backend_post_process_headers _bfd_elf_set_osabi + +static int +i370_noop (void) +{ + return 1; +} + +#define elf_backend_finish_dynamic_symbol \ + (bfd_boolean (*) \ + (bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, \ + Elf_Internal_Sym *)) i370_noop + +#include "elf32-target.h" |