diff options
Diffstat (limited to 'bfd/elf32-tic6x.c')
| -rw-r--r-- | bfd/elf32-tic6x.c | 1920 |
1 files changed, 1910 insertions, 10 deletions
diff --git a/bfd/elf32-tic6x.c b/bfd/elf32-tic6x.c index 3674a3a..7708e05 100644 --- a/bfd/elf32-tic6x.c +++ b/bfd/elf32-tic6x.c @@ -1,5 +1,5 @@ /* 32-bit ELF support for TI C6X - Copyright 2010 + Copyright 2010, 2011 Free Software Foundation, Inc. Contributed by Joseph Myers <joseph@codesourcery.com> Bernd Schmidt <bernds@codesourcery.com> @@ -29,6 +29,52 @@ #include "elf/tic6x.h" #include "elf32-tic6x.h" +#define ELF_DYNAMIC_INTERPRETER "/lib/ld-uClibc.so.0" + +/* DSBT binaries have a default 128K stack. */ +#define DEFAULT_STACK_SIZE 0x20000 + +/* The size in bytes of an entry in the procedure linkage table. */ +#define PLT_ENTRY_SIZE 24 + +/* TI C6X ELF linker hash table. */ + +struct elf32_tic6x_link_hash_table +{ + struct elf_link_hash_table elf; + + /* Short-cuts to get to dynamic linker sections. */ + asection *sdynbss; + asection *srelbss; + + /* C6X specific command line arguments. */ + struct elf32_tic6x_params params; + + /* Small local sym cache. */ + struct sym_cache sym_cache; + + /* The output BFD, for convenience. */ + bfd *obfd; + + /* The .dsbt section. */ + asection *dsbt; +}; + +/* Get the TI C6X ELF linker hash table from a link_info structure. */ + +#define elf32_tic6x_hash_table(p) \ + ((struct elf32_tic6x_link_hash_table *) ((p)->hash)) + +/* TI C6X ELF linker hash entry. */ + +struct elf32_tic6x_link_hash_entry +{ + struct elf_link_hash_entry elf; + + /* Track dynamic relocs copied for this symbol. */ + struct elf_dyn_relocs *dyn_relocs; +}; + struct elf32_tic6x_obj_tdata { struct elf_obj_tdata root; @@ -42,6 +88,20 @@ struct elf32_tic6x_obj_tdata #define elf32_tic6x_tdata(abfd) \ ((struct elf32_tic6x_obj_tdata *) (abfd)->tdata.any) +#define is_tic6x_elf(bfd) \ + (bfd_get_flavour (bfd) == bfd_target_elf_flavour \ + && elf_tdata (bfd) != NULL \ + && elf_object_id (bfd) == TIC6X_ELF_DATA) + +/* C6X ELF uses two common sections. One is the usual one, and the + other is for small objects. All the small objects are kept + together, and then referenced via the gp pointer, which yields + faster assembler code. This is what we use for the small common + section. This approach is copied from ecoff.c. */ +static asection tic6x_elf_scom_section; +static asymbol tic6x_elf_scom_symbol; +static asymbol *tic6x_elf_scom_symbol_ptr; + static reloc_howto_type elf32_tic6x_howto_table[] = { HOWTO (R_C6000_NONE, /* type */ @@ -395,7 +455,19 @@ static reloc_howto_type elf32_tic6x_howto_table[] = 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ - EMPTY_HOWTO (27), + HOWTO (R_C6000_JUMP_SLOT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_C6000_JUMP_SLOT", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ EMPTY_HOWTO (28), EMPTY_HOWTO (29), EMPTY_HOWTO (30), @@ -955,7 +1027,19 @@ static reloc_howto_type elf32_tic6x_howto_table_rel[] = 0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ - EMPTY_HOWTO (27), + HOWTO (R_C6000_JUMP_SLOT, /* type */ + 0, /* rightshift */ + 2, /* size (0 = byte, 1 = short, 2 = long) */ + 32, /* bitsize */ + FALSE, /* pc_relative */ + 0, /* bitpos */ + complain_overflow_dont,/* complain_on_overflow */ + bfd_elf_generic_reloc, /* special_function */ + "R_C6000_JUMP_SLOT", /* name */ + FALSE, /* partial_inplace */ + 0, /* src_mask */ + 0xffffffff, /* dst_mask */ + FALSE), /* pcrel_offset */ EMPTY_HOWTO (28), EMPTY_HOWTO (29), EMPTY_HOWTO (30), @@ -1259,6 +1343,10 @@ static const tic6x_reloc_map elf32_tic6x_reloc_map[] = { BFD_RELOC_C6000_DSBT_INDEX, R_C6000_DSBT_INDEX }, { BFD_RELOC_C6000_PREL31, R_C6000_PREL31 }, { BFD_RELOC_C6000_COPY, R_C6000_COPY }, + { BFD_RELOC_C6000_JUMP_SLOT, R_C6000_JUMP_SLOT }, + { BFD_RELOC_C6000_EHTYPE, R_C6000_EHTYPE }, + { BFD_RELOC_C6000_PCR_H16, R_C6000_PCR_H16 }, + { BFD_RELOC_C6000_PCR_L16, R_C6000_PCR_L16 }, { BFD_RELOC_C6000_ALIGN, R_C6000_ALIGN }, { BFD_RELOC_C6000_FPHEAD, R_C6000_FPHEAD }, { BFD_RELOC_C6000_NOCMP, R_C6000_NOCMP } @@ -1349,6 +1437,130 @@ elf32_tic6x_set_use_rela_p (bfd *abfd, bfd_boolean use_rela_p) elf32_tic6x_tdata (abfd)->use_rela_p = use_rela_p; } +/* Create an entry in a C6X ELF linker hash table. */ + +static struct bfd_hash_entry * +elf32_tic6x_link_hash_newfunc (struct bfd_hash_entry *entry, + struct bfd_hash_table *table, + const char *string) +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, + sizeof (struct elf32_tic6x_link_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = _bfd_elf_link_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct elf32_tic6x_link_hash_entry *eh; + + eh = (struct elf32_tic6x_link_hash_entry *) entry; + eh->dyn_relocs = NULL; + } + + return entry; +} + +/* Create a C6X ELF linker hash table. */ + +static struct bfd_link_hash_table * +elf32_tic6x_link_hash_table_create (bfd *abfd) +{ + struct elf32_tic6x_link_hash_table *ret; + bfd_size_type amt = sizeof (struct elf32_tic6x_link_hash_table); + + ret = bfd_malloc (amt); + if (ret == NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, + elf32_tic6x_link_hash_newfunc, + sizeof (struct elf32_tic6x_link_hash_entry), + TIC6X_ELF_DATA)) + { + free (ret); + return NULL; + } + + ret->sym_cache.abfd = NULL; + ret->obfd = abfd; + ret->elf.is_relocatable_executable = 1; + + return &ret->elf.root; +} + +/* Destroy a C6X ELF linker hash table. */ + +static void +elf32_tic6x_link_hash_table_free (struct bfd_link_hash_table *hash) +{ + _bfd_generic_link_hash_table_free (hash); +} + +/* Called to pass PARAMS to the backend. We store them in the hash table + associated with INFO. */ + +void +elf32_tic6x_setup (struct bfd_link_info *info, + struct elf32_tic6x_params *params) +{ + struct elf32_tic6x_link_hash_table *htab = elf32_tic6x_hash_table (info); + htab->params = *params; +} + +/* Determine if we're dealing with a DSBT object. */ + +static bfd_boolean +elf32_tic6x_using_dsbt (bfd *abfd) +{ + return bfd_elf_get_obj_attr_int (abfd, OBJ_ATTR_PROC, + Tag_ABI_DSBT); +} + +/* Create .plt, .rela.plt, .got, .got.plt, .rela.got and .dsbt + sections in DYNOBJ, and set up shortcuts to them in our hash + table. */ + +static bfd_boolean +elf32_tic6x_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info) +{ + struct elf32_tic6x_link_hash_table *htab; + flagword flags; + + htab = elf32_tic6x_hash_table (info); + if (htab == NULL) + return FALSE; + + if (!_bfd_elf_create_dynamic_sections (dynobj, info)) + return FALSE; + + /* Create .dsbt */ + flags = (SEC_ALLOC | SEC_LOAD + | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_LINKER_CREATED); + htab->dsbt = bfd_make_section_anyway_with_flags (dynobj, ".dsbt", + flags); + if (htab->dsbt == NULL + || ! bfd_set_section_alignment (dynobj, htab->dsbt, 2) + || ! bfd_set_section_alignment (dynobj, htab->elf.splt, 5)) + return FALSE; + + htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); + if (!info->shared) + htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); + + if (!htab->sdynbss + || (!info->shared && !htab->srelbss)) + abort (); + + return TRUE; +} + static bfd_boolean elf32_tic6x_mkobject (bfd *abfd) { @@ -1361,6 +1573,421 @@ elf32_tic6x_mkobject (bfd *abfd) return ret; } +/* Install relocation RELA into section SRELA, incrementing its + reloc_count. */ + +static void +elf32_tic6x_install_rela (bfd *output_bfd, asection *srela, + Elf_Internal_Rela *rela) +{ + bfd_byte *loc; + bfd_vma off = srela->reloc_count++ * sizeof (Elf32_External_Rela); + loc = srela->contents + off; + BFD_ASSERT (off < srela->size); + bfd_elf32_swap_reloca_out (output_bfd, rela, loc); +} + +/* Create a dynamic reloc against the GOT at offset OFFSET. The contents + of the GOT at this offset have been initialized with the relocation. */ + +static void +elf32_tic6x_make_got_dynreloc (bfd *output_bfd, + struct elf32_tic6x_link_hash_table *htab, + asection *sym_sec, bfd_vma offset) +{ + asection *sgot = htab->elf.sgot; + Elf_Internal_Rela outrel; + int dynindx; + + outrel.r_offset = sgot->output_section->vma + sgot->output_offset + offset; + outrel.r_addend = bfd_get_32 (output_bfd, sgot->contents + offset); + if (sym_sec && sym_sec->output_section + && ! bfd_is_abs_section (sym_sec->output_section) + && ! bfd_is_und_section (sym_sec->output_section)) + { + dynindx = elf_section_data (sym_sec->output_section)->dynindx; + outrel.r_addend -= sym_sec->output_section->vma; + } + else + { + dynindx = 0; + } + outrel.r_info = ELF32_R_INFO (dynindx, R_C6000_ABS32); + elf32_tic6x_install_rela (output_bfd, htab->elf.srelgot, &outrel); +} + +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static bfd_boolean +elf32_tic6x_finish_dynamic_symbol (bfd * output_bfd, + struct bfd_link_info *info, + struct elf_link_hash_entry *h, + Elf_Internal_Sym * sym) +{ + bfd *dynobj; + struct elf32_tic6x_link_hash_table *htab; + + htab = elf32_tic6x_hash_table (info); + dynobj = htab->elf.dynobj; + + if (h->plt.offset != (bfd_vma) -1) + { + bfd_vma plt_index; + bfd_vma got_section_offset, got_dp_offset, rela_offset; + Elf_Internal_Rela rela; + bfd_byte *loc; + asection *plt, *gotplt, *relplt; + const struct elf_backend_data *bed; + + bed = get_elf_backend_data (output_bfd); + + BFD_ASSERT (htab->elf.splt != NULL); + plt = htab->elf.splt; + gotplt = htab->elf.sgotplt; + relplt = htab->elf.srelplt; + + /* This symbol has an entry in the procedure linkage table. Set + it up. */ + + if ((h->dynindx == -1 + && !((h->forced_local || info->executable) + && h->def_regular + && h->type == STT_GNU_IFUNC)) + || plt == NULL + || gotplt == NULL + || relplt == NULL) + abort (); + + /* Get the index in the procedure linkage table which + corresponds to this symbol. This is the index of this symbol + in all the symbols for which we are making plt entries. The + first entry in the procedure linkage table is reserved. + + Get the offset into the .got table of the entry that + corresponds to this function. Each .got entry is 4 bytes. + The first three are reserved. + + For static executables, we don't reserve anything. */ + + plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1; + got_section_offset = plt_index + bed->got_header_size / 4; + got_dp_offset = got_section_offset + htab->params.dsbt_size; + rela_offset = plt_index * sizeof (Elf32_External_Rela); + + got_section_offset *= 4; + + /* Fill in the entry in the procedure linkage table. */ + + /* ldw .d2t2 *+B14($GOT(f)), b2 */ + bfd_put_32 (output_bfd, got_dp_offset << 8 | 0x0100006e, + plt->contents + h->plt.offset); + /* mvk .s2 low(rela_offset), b0 */ + bfd_put_32 (output_bfd, (rela_offset & 0xffff) << 7 | 0x0000002a, + plt->contents + h->plt.offset + 4); + /* mvkh .s2 high(rela_offset), b0 */ + bfd_put_32 (output_bfd, ((rela_offset >> 16) & 0xffff) << 7 | 0x0000006a, + plt->contents + h->plt.offset + 8); + /* nop 2 */ + bfd_put_32 (output_bfd, 0x00002000, + plt->contents + h->plt.offset + 12); + /* b .s2 b2 */ + bfd_put_32 (output_bfd, 0x00080362, + plt->contents + h->plt.offset + 16); + /* nop 5 */ + bfd_put_32 (output_bfd, 0x00008000, + plt->contents + h->plt.offset + 20); + + /* Fill in the entry in the global offset table. */ + bfd_put_32 (output_bfd, + (plt->output_section->vma + plt->output_offset), + gotplt->contents + got_section_offset); + + /* Fill in the entry in the .rel.plt section. */ + rela.r_offset = (gotplt->output_section->vma + + gotplt->output_offset + + got_section_offset); + rela.r_info = ELF32_R_INFO (h->dynindx, R_C6000_JUMP_SLOT); + rela.r_addend = 0; + loc = relplt->contents + rela_offset; + bfd_elf32_swap_reloca_out (output_bfd, &rela, loc); + + if (!h->def_regular) + { + /* Mark the symbol as undefined, rather than as defined in + the .plt section. */ + sym->st_shndx = SHN_UNDEF; + sym->st_value = 0; + } + } + + if (h->got.offset != (bfd_vma) -1) + { + asection *sgot; + asection *srela; + + /* This symbol has an entry in the global offset table. + Set it up. */ + + sgot = bfd_get_section_by_name (dynobj, ".got"); + srela = bfd_get_section_by_name (dynobj, ".rela.got"); + BFD_ASSERT (sgot != NULL && srela != NULL); + + /* If this is a -Bsymbolic link, and the symbol is defined + locally, we just want to emit a RELATIVE reloc. Likewise if + the symbol was forced to be local because of a version file. + The entry in the global offset table will already have been + initialized in the relocate_section function. */ + if (info->shared + && (info->symbolic + || h->dynindx == -1 || h->forced_local) && h->def_regular) + { + asection *s = h->root.u.def.section; + elf32_tic6x_make_got_dynreloc (output_bfd, htab, s, + h->got.offset & ~(bfd_vma) 1); + } + else + { + Elf_Internal_Rela outrel; + bfd_put_32 (output_bfd, (bfd_vma) 0, + sgot->contents + (h->got.offset & ~(bfd_vma) 1)); + outrel.r_offset = (sgot->output_section->vma + + sgot->output_offset + + (h->got.offset & ~(bfd_vma) 1)); + outrel.r_info = ELF32_R_INFO (h->dynindx, R_C6000_ABS32); + outrel.r_addend = 0; + + elf32_tic6x_install_rela (output_bfd, srela, &outrel); + } + } + + if (h->needs_copy) + { + Elf_Internal_Rela rel; + + /* This symbol needs a copy reloc. Set it up. */ + + if (h->dynindx == -1 + || (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak) + || htab->srelbss == NULL) + abort (); + + rel.r_offset = (h->root.u.def.value + + h->root.u.def.section->output_section->vma + + h->root.u.def.section->output_offset); + rel.r_info = ELF32_R_INFO (h->dynindx, R_C6000_COPY); + rel.r_addend = 0; + + elf32_tic6x_install_rela (output_bfd, htab->srelbss, &rel); + } + + /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ + if (strcmp (h->root.root.string, "_DYNAMIC") == 0 + || h == elf_hash_table (info)->hgot) + sym->st_shndx = SHN_ABS; + + return TRUE; +} + +/* Update the got entry reference counts for the section being removed. */ + +static bfd_boolean +elf32_tic6x_gc_sweep_hook (bfd *abfd, + struct bfd_link_info *info, + asection *sec, + const Elf_Internal_Rela *relocs) +{ + struct elf32_tic6x_link_hash_table *htab; + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry **sym_hashes; + bfd_signed_vma *local_got_refcounts; + const Elf_Internal_Rela *rel, *relend; + + if (info->relocatable) + return TRUE; + + htab = elf32_tic6x_hash_table (info); + if (htab == NULL) + return FALSE; + + elf_section_data (sec)->local_dynrel = NULL; + + symtab_hdr = &elf_symtab_hdr (abfd); + sym_hashes = elf_sym_hashes (abfd); + local_got_refcounts = elf_local_got_refcounts (abfd); + + relend = relocs + sec->reloc_count; + for (rel = relocs; rel < relend; rel++) + { + unsigned long r_symndx; + unsigned int r_type; + struct elf_link_hash_entry *h = NULL; + + r_symndx = ELF32_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + struct elf32_tic6x_link_hash_entry *eh; + struct elf_dyn_relocs **pp; + struct elf_dyn_relocs *p; + + 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; + eh = (struct elf32_tic6x_link_hash_entry *) h; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + /* Everything must go for SEC. */ + *pp = p->next; + break; + } + } + + r_type = ELF32_R_TYPE (rel->r_info); + + switch (r_type) + { + case R_C6000_SBR_GOT_U15_W: + case R_C6000_SBR_GOT_L16_W: + case R_C6000_SBR_GOT_H16_W: + if (h != NULL) + { + if (h->got.refcount > 0) + h->got.refcount -= 1; + } + else if (local_got_refcounts != NULL) + { + if (local_got_refcounts[r_symndx] > 0) + local_got_refcounts[r_symndx] -= 1; + } + break; + + default: + break; + } + } + + 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. */ + +static bfd_boolean +elf32_tic6x_adjust_dynamic_symbol (struct bfd_link_info *info, + struct elf_link_hash_entry *h) +{ + struct elf32_tic6x_link_hash_table *htab; + bfd *dynobj; + asection *s; + + dynobj = elf_hash_table (info)->dynobj; + + /* 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))); + + /* If this is a function, put it in the procedure linkage table. We + will fill in the contents of the procedure linkage table later, + when we know the address of the .got section. */ + if (h->type == STT_FUNC + || h->needs_plt) + { + if (h->plt.refcount <= 0 + || SYMBOL_CALLS_LOCAL (info, h) + || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT + && h->root.type == bfd_link_hash_undefweak)) + { + /* This case can occur if we saw a PLT32 reloc in an input + file, but the symbol was never referred to by a dynamic + object, or if all references were garbage collected. In + such a case, we don't actually need to build a procedure + linkage table, and we can just do a PC32 reloc instead. */ + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + + return TRUE; + } + + /* 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; + h->non_got_ref = h->u.weakdef->non_got_ref; + 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; + + /* If there are no references to this symbol that do not use the + GOT, we don't need to generate a copy reloc. */ + if (!h->non_got_ref) + return TRUE; + + /* If -z nocopyreloc was given, we won't generate them either. */ + if (info->nocopyreloc) + { + h->non_got_ref = 0; + return TRUE; + } + + htab = elf32_tic6x_hash_table (info); + if (htab == NULL) + return FALSE; + + if (h->size == 0) + { + (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"), + h->root.root.string); + 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. */ + + /* We must generate a R_C6000_COPY reloc to tell the dynamic linker to + copy the initial value out of the dynamic object and into the + runtime process image. */ + if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) + { + htab->srelbss->size += sizeof (Elf32_External_Rela); + h->needs_copy = 1; + } + + s = htab->sdynbss; + + return _bfd_elf_adjust_dynamic_copy (h, s); +} + static bfd_boolean elf32_tic6x_new_section_hook (bfd *abfd, asection *sec) { @@ -1394,6 +2021,29 @@ elf32_tic6x_rel_relocation_p (bfd *abfd, asection *sec, < NUM_SHDR_ENTRIES (rel_hdr) * bed->s->int_rels_per_ext_rel); } +/* We need dynamic symbols for every section, since segments can + relocate independently. */ +static bfd_boolean +elf32_tic6x_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + asection *p) +{ + switch (elf_section_data (p)->this_hdr.sh_type) + { + case SHT_PROGBITS: + case SHT_NOBITS: + /* If sh_type is yet undecided, assume it could be + SHT_PROGBITS/SHT_NOBITS. */ + case SHT_NULL: + return FALSE; + + /* There shouldn't be section relative relocations + against any other section. */ + default: + return TRUE; + } +} + static bfd_boolean elf32_tic6x_relocate_section (bfd *output_bfd, struct bfd_link_info *info, @@ -1404,14 +2054,20 @@ elf32_tic6x_relocate_section (bfd *output_bfd, Elf_Internal_Sym *local_syms, asection **local_sections) { + bfd *dynobj; + struct elf32_tic6x_link_hash_table *htab; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; + bfd_vma *local_got_offsets; Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; bfd_boolean ok = TRUE; + htab = elf32_tic6x_hash_table (info); + dynobj = elf_hash_table (info)->dynobj; symtab_hdr = & elf_symtab_hdr (input_bfd); sym_hashes = elf_sym_hashes (input_bfd); + local_got_offsets = elf_local_got_offsets (input_bfd); relend = relocs + input_section->reloc_count; @@ -1424,7 +2080,7 @@ elf32_tic6x_relocate_section (bfd *output_bfd, Elf_Internal_Sym *sym; asection *sec; struct elf_link_hash_entry *h; - bfd_vma relocation; + bfd_vma off, relocation; bfd_boolean unresolved_reloc; bfd_reloc_status_type r; struct bfd_link_hash_entry *sbh; @@ -1497,22 +2153,136 @@ elf32_tic6x_relocate_section (bfd *output_bfd, continue; case R_C6000_PCR_S21: + /* A branch to an undefined weak symbol is turned into a + "b .s2 B3" instruction if the existing insn is of the + form "b .s2 symbol". */ + if (h ? h->root.type == bfd_link_hash_undefweak + && (htab->elf.splt == NULL || h->plt.offset == (bfd_vma) -1) + : r_symndx != STN_UNDEF && bfd_is_und_section (sec)) + { + unsigned long oldval; + oldval = bfd_get_32 (input_bfd, contents + rel->r_offset); + + if ((oldval & 0x7e) == 0x12) + { + oldval &= 0xF0000001; + bfd_put_32 (input_bfd, oldval | 0x000c0362, + contents + rel->r_offset); + r = bfd_reloc_ok; + goto done_reloc; + } + } + case R_C6000_PCR_S12: case R_C6000_PCR_S10: case R_C6000_PCR_S7: + if (h != NULL + && h->plt.offset != (bfd_vma) -1 + && htab->elf.splt != NULL) + { + relocation = (htab->elf.splt->output_section->vma + + htab->elf.splt->output_offset + + h->plt.offset); + } + /* Generic PC-relative handling produces a value relative to the exact location of the relocation. Adjust it to be relative to the start of the fetch packet instead. */ relocation += (input_section->output_section->vma + input_section->output_offset + rel->r_offset) & 0x1f; - /* Fall through. */ + unresolved_reloc = FALSE; + break; + + case R_C6000_DSBT_INDEX: + relocation = elf32_tic6x_hash_table (info)->params.dsbt_index; + if (!info->shared || relocation != 0) + break; + + /* fall through */ case R_C6000_ABS32: case R_C6000_ABS16: case R_C6000_ABS8: case R_C6000_ABS_S16: case R_C6000_ABS_L16: case R_C6000_ABS_H16: + /* When generating a shared object or relocatable executable, these + relocations are copied into the output file to be resolved at + run time. */ + if ((info->shared || elf32_tic6x_using_dsbt (output_bfd)) + && (input_section->flags & SEC_ALLOC) + && (h == NULL + || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT + || h->root.type != bfd_link_hash_undefweak)) + { + Elf_Internal_Rela outrel; + bfd_boolean skip, relocate; + asection *sreloc; + + unresolved_reloc = FALSE; + + sreloc = elf_section_data (input_section)->sreloc; + BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL); + + skip = FALSE; + relocate = FALSE; + + outrel.r_offset = + _bfd_elf_section_offset (output_bfd, info, input_section, + rel->r_offset); + if (outrel.r_offset == (bfd_vma) -1) + skip = TRUE; + else if (outrel.r_offset == (bfd_vma) -2) + skip = TRUE, relocate = TRUE; + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + memset (&outrel, 0, sizeof outrel); + else if (h != NULL + && h->dynindx != -1 + && (!info->shared + || !info->symbolic + || !h->def_regular)) + { + outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); + outrel.r_addend = rel->r_addend; + } + else + { + long indx; + + outrel.r_addend = relocation + rel->r_addend; + + 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; + + osec = sec->output_section; + indx = elf_section_data (osec)->dynindx; + outrel.r_addend -= osec->vma; + BFD_ASSERT (indx != 0); + } + + outrel.r_info = ELF32_R_INFO (indx, r_type); + } + + elf32_tic6x_install_rela (output_bfd, sreloc, &outrel); + + /* If this reloc is against an external symbol, we do not want to + fiddle with the addend. Otherwise, we need to include the symbol + value so that it becomes an addend for the dynamic reloc. */ + if (! relocate) + continue; + } + /* Generic logic OK. */ break; @@ -1531,9 +2301,17 @@ elf32_tic6x_relocate_section (bfd *output_bfd, if (sbh != NULL && (sbh->type == bfd_link_hash_defined || sbh->type == bfd_link_hash_defweak)) - relocation -= (sbh->u.def.value - + sbh->u.def.section->output_section->vma - + sbh->u.def.section->output_offset); + { + if (h ? (h->root.type == bfd_link_hash_undefweak + && (htab->elf.splt == NULL + || h->plt.offset == (bfd_vma) -1)) + : r_symndx != STN_UNDEF && bfd_is_und_section (sec)) + relocation = 0; + else + relocation -= (sbh->u.def.value + + sbh->u.def.section->output_section->vma + + sbh->u.def.section->output_offset); + } else { (*_bfd_error_handler) (_("%B: SB-relative relocation but " @@ -1547,7 +2325,122 @@ elf32_tic6x_relocate_section (bfd *output_bfd, case R_C6000_SBR_GOT_U15_W: case R_C6000_SBR_GOT_L16_W: case R_C6000_SBR_GOT_H16_W: - case R_C6000_DSBT_INDEX: + /* Relocation is to the entry for this symbol in the global + offset table. */ + if (htab->elf.sgot == NULL) + abort (); + + if (h != NULL) + { + bfd_boolean dyn; + + off = h->got.offset; + dyn = htab->elf.dynamic_sections_created; + if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h) + || (info->shared + && SYMBOL_REFERENCES_LOCAL (info, h)) + || (ELF_ST_VISIBILITY (h->other) + && h->root.type == bfd_link_hash_undefweak)) + { + /* This is actually a static link, or it is a + -Bsymbolic link and the symbol is defined + locally, or the symbol was forced to be local + because of a version file. We must initialize + this entry in the global offset table. Since the + offset must always be a multiple of 4, we use the + least significant bit to record whether we have + initialized it already. + + When doing a dynamic link, we create a .rel.got + relocation entry to initialize the value. This + is done in the finish_dynamic_symbol routine. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, + htab->elf.sgot->contents + off); + h->got.offset |= 1; + + if (!WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, + h) + && !(ELF_ST_VISIBILITY (h->other) + && h->root.type == bfd_link_hash_undefweak)) + elf32_tic6x_make_got_dynreloc (output_bfd, htab, sec, + off); + } + } + else + unresolved_reloc = FALSE; + } + else + { + if (local_got_offsets == NULL) + abort (); + + off = local_got_offsets[r_symndx]; + + /* The offset must always be a multiple of 4. We use + the least significant bit to record whether we have + already generated the necessary reloc. */ + if ((off & 1) != 0) + off &= ~1; + else + { + bfd_put_32 (output_bfd, relocation, + htab->elf.sgot->contents + off); + + if (info->shared || elf32_tic6x_using_dsbt (output_bfd)) + elf32_tic6x_make_got_dynreloc (output_bfd, htab, sec, off); + + local_got_offsets[r_symndx] |= 1; + } + } + + if (off >= (bfd_vma) -2) + abort (); + + if (htab->dsbt) + relocation = (htab->elf.sgot->output_section->vma + + htab->elf.sgot->output_offset + off + - htab->dsbt->output_section->vma + - htab->dsbt->output_offset); + else + relocation = (htab->elf.sgot->output_section->vma + + htab->elf.sgot->output_offset + off + - htab->elf.sgotplt->output_section->vma + - htab->elf.sgotplt->output_offset); + + if (rel->r_addend != 0) + { + /* We can't do anything for a relocation which is against + a symbol *plus offset*. GOT holds relocations for + symbols. Make this an error; the compiler isn't + allowed to pass us these kinds of things. */ + if (h == NULL) + (*_bfd_error_handler) + (_("%B, section %A: relocation %s with non-zero addend %d" + " against local symbol"), + input_bfd, + input_section, + elf32_tic6x_howto_table[r_type].name, + rel->r_addend); + else + (*_bfd_error_handler) + (_("%B, section %A: relocation %s with non-zero addend %d" + " against symbol `%s'"), + input_bfd, + input_section, + elf32_tic6x_howto_table[r_type].name, + rel->r_addend, + h->root.root.string[0] != '\0' ? h->root.root.string + : _("[whose name is lost]")); + + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + break; + case R_C6000_PREL31: /* Shared libraries and exception handling support not implemented. */ @@ -1658,6 +2551,936 @@ elf32_tic6x_relocate_section (bfd *output_bfd, return ok; } + +/* Look through the relocs for a section during the first phase, and + calculate needed space in the global offset table, procedure linkage + table, and dynamic reloc sections. */ + +static bfd_boolean +elf32_tic6x_check_relocs (bfd *abfd, struct bfd_link_info *info, + asection *sec, const Elf_Internal_Rela *relocs) +{ + struct elf32_tic6x_link_hash_table *htab; + 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; + + htab = elf32_tic6x_hash_table (info); + symtab_hdr = &elf_symtab_hdr (abfd); + sym_hashes = elf_sym_hashes (abfd); + + /* Create dynamic sections for relocatable executables so that we can + copy relocations. */ + if (elf32_tic6x_using_dsbt (abfd) + && ! htab->elf.dynamic_sections_created) + { + if (! _bfd_elf_link_create_dynamic_sections (abfd, info)) + return FALSE; + } + + sreloc = NULL; + + rel_end = relocs + sec->reloc_count; + for (rel = relocs; rel < rel_end; rel++) + { + unsigned int r_type; + unsigned long r_symndx; + struct elf_link_hash_entry *h; + Elf_Internal_Sym *isym; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + + if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%B: bad symbol index: %d"), + abfd, + r_symndx); + return FALSE; + } + + if (r_symndx < symtab_hdr->sh_info) + { + /* A local symbol. */ + isym = bfd_sym_from_r_symndx (&htab->sym_cache, + abfd, r_symndx); + if (isym == NULL) + return FALSE; + h = NULL; + } + else + { + isym = NULL; + 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; + } + + switch (r_type) + { + case R_C6000_PCR_S21: + /* This symbol requires a procedure linkage table entry. We + actually build the entry in adjust_dynamic_symbol, + because this might be a case of linking PIC code which is + never referenced by a dynamic object, in which case we + don't need to generate a procedure linkage table entry + after all. */ + + /* If this is a local symbol, we resolve it directly without + creating a procedure linkage table entry. */ + if (h == NULL) + continue; + + h->needs_plt = 1; + h->plt.refcount += 1; + break; + + case R_C6000_SBR_GOT_U15_W: + case R_C6000_SBR_GOT_L16_W: + case R_C6000_SBR_GOT_H16_W: + /* This symbol requires a global offset table entry. */ + if (h != NULL) + { + h->got.refcount += 1; + } + else + { + bfd_signed_vma *local_got_refcounts; + + /* This is a global offset table entry for a local symbol. */ + local_got_refcounts = elf_local_got_refcounts (abfd); + if (local_got_refcounts == NULL) + { + bfd_size_type size; + + size = symtab_hdr->sh_info; + size *= (sizeof (bfd_signed_vma) + + sizeof (bfd_vma) + sizeof(char)); + local_got_refcounts = bfd_zalloc (abfd, size); + if (local_got_refcounts == NULL) + return FALSE; + elf_local_got_refcounts (abfd) = local_got_refcounts; + } + local_got_refcounts[r_symndx] += 1; + } + + if (htab->elf.sgot == NULL) + { + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + if (!_bfd_elf_create_got_section (htab->elf.dynobj, info)) + return FALSE; + } + break; + + case R_C6000_DSBT_INDEX: + /* We'd like to check for nonzero dsbt_index here, but it's + set up only after check_relocs is called. Instead, we + store the number of R_C6000_DSBT_INDEX relocs in the + pc_count field, and potentially discard the extra space + in elf32_tic6x_allocate_dynrelocs. */ + if (!info->shared) + break; + + /* fall through */ + case R_C6000_ABS32: + case R_C6000_ABS16: + case R_C6000_ABS8: + case R_C6000_ABS_S16: + case R_C6000_ABS_L16: + case R_C6000_ABS_H16: + /* If we are creating a shared library, and this is a reloc + against a global symbol, or a non PC relative reloc + against a local symbol, then we need to copy the reloc + into the shared library. However, if we are linking with + -Bsymbolic, we do not need to copy a reloc against a + global symbol which is defined in an object we are + including in the link (i.e., DEF_REGULAR is set). At + this point we have not seen all the input files, so it is + possible that DEF_REGULAR is not set now but will be set + later (it is never cleared). In case of a weak definition, + DEF_REGULAR may be cleared later by a strong definition in + a shared library. We account for that possibility below by + storing information in the relocs_copied field of the hash + table entry. A similar situation occurs when creating + shared libraries and symbol visibility changes render the + symbol local. + + If on the other hand, we are creating an executable, we + may need to keep relocations for symbols satisfied by a + dynamic library if we manage to avoid copy relocs for the + symbol. */ + if ((info->shared || elf32_tic6x_using_dsbt (abfd)) + && (sec->flags & SEC_ALLOC) != 0) + { + struct elf_dyn_relocs *p; + struct elf_dyn_relocs **head; + + /* We must copy these reloc types into the output file. + Create a reloc section in dynobj and make room for + this reloc. */ + if (sreloc == NULL) + { + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + + sreloc = _bfd_elf_make_dynamic_reloc_section + (sec, htab->elf.dynobj, 2, abfd, /*rela? */ TRUE); + + if (sreloc == NULL) + return FALSE; + } + + /* If this is a global symbol, we count the number of + relocations we need for this symbol. */ + if (h != NULL) + { + head = &((struct elf32_tic6x_link_hash_entry *) h)->dyn_relocs; + } + else + { + /* Track dynamic relocs needed for local syms too. + We really need local syms available to do this + easily. Oh well. */ + void **vpp; + asection *s; + + s = bfd_section_from_elf_index (abfd, isym->st_shndx); + if (s == NULL) + s = sec; + + vpp = &elf_section_data (s)->local_dynrel; + head = (struct elf_dyn_relocs **)vpp; + } + + p = *head; + if (p == NULL || p->sec != sec) + { + bfd_size_type amt = sizeof *p; + p = bfd_alloc (htab->elf.dynobj, amt); + if (p == NULL) + return FALSE; + p->next = *head; + *head = p; + p->sec = sec; + p->count = 0; + } + + p->count += 1; + if (r_type == R_C6000_DSBT_INDEX) + p->pc_count += 1; + } + break; + + case R_C6000_SBR_U15_B: + case R_C6000_SBR_U15_H: + case R_C6000_SBR_U15_W: + case R_C6000_SBR_S16: + case R_C6000_SBR_L16_B: + case R_C6000_SBR_L16_H: + case R_C6000_SBR_L16_W: + case R_C6000_SBR_H16_B: + case R_C6000_SBR_H16_H: + case R_C6000_SBR_H16_W: + if (h != NULL && info->executable) + { + /* For B14-relative addresses, we might need a copy + reloc. */ + h->non_got_ref = 1; + } + break; + + default: + break; + } + } + + return TRUE; +} + +static bfd_boolean +elf32_tic6x_add_symbol_hook (bfd *abfd, + struct bfd_link_info *info ATTRIBUTE_UNUSED, + Elf_Internal_Sym *sym, + const char **namep ATTRIBUTE_UNUSED, + flagword *flagsp ATTRIBUTE_UNUSED, + asection **secp, + bfd_vma *valp) +{ + switch (sym->st_shndx) + { + case SHN_TIC6X_SCOMMON: + *secp = bfd_make_section_old_way (abfd, ".scommon"); + (*secp)->flags |= SEC_IS_COMMON; + *valp = sym->st_size; + bfd_set_section_alignment (abfd, *secp, bfd_log2 (sym->st_value)); + break; + } + + return TRUE; +} + +static void +elf32_tic6x_symbol_processing (bfd *abfd ATTRIBUTE_UNUSED, asymbol *asym) +{ + elf_symbol_type *elfsym; + + elfsym = (elf_symbol_type *) asym; + switch (elfsym->internal_elf_sym.st_shndx) + { + case SHN_TIC6X_SCOMMON: + if (tic6x_elf_scom_section.name == NULL) + { + /* Initialize the small common section. */ + tic6x_elf_scom_section.name = ".scommon"; + tic6x_elf_scom_section.flags = SEC_IS_COMMON; + tic6x_elf_scom_section.output_section = &tic6x_elf_scom_section; + tic6x_elf_scom_section.symbol = &tic6x_elf_scom_symbol; + tic6x_elf_scom_section.symbol_ptr_ptr = &tic6x_elf_scom_symbol_ptr; + tic6x_elf_scom_symbol.name = ".scommon"; + tic6x_elf_scom_symbol.flags = BSF_SECTION_SYM; + tic6x_elf_scom_symbol.section = &tic6x_elf_scom_section; + tic6x_elf_scom_symbol_ptr = &tic6x_elf_scom_symbol; + } + asym->section = &tic6x_elf_scom_section; + asym->value = elfsym->internal_elf_sym.st_size; + break; + } +} + +static int +elf32_tic6x_link_output_symbol_hook (struct bfd_link_info *info ATTRIBUTE_UNUSED, + const char *name ATTRIBUTE_UNUSED, + Elf_Internal_Sym *sym, + asection *input_sec, + struct elf_link_hash_entry *h ATTRIBUTE_UNUSED) +{ + /* If we see a common symbol, which implies a relocatable link, then + if a symbol was small common in an input file, mark it as small + common in the output file. */ + if (sym->st_shndx == SHN_COMMON && strcmp (input_sec->name, ".scommon") == 0) + sym->st_shndx = SHN_TIC6X_SCOMMON; + + return 1; +} + +static bfd_boolean +elf32_tic6x_section_from_bfd_section (bfd *abfd ATTRIBUTE_UNUSED, + asection *sec, + int *retval) +{ + if (strcmp (bfd_get_section_name (abfd, sec), ".scommon") == 0) + { + *retval = SHN_TIC6X_SCOMMON; + return TRUE; + } + + return FALSE; +} + +/* Allocate space in .plt, .got and associated reloc sections for + dynamic relocs. */ + +static bfd_boolean +elf32_tic6x_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) +{ + struct bfd_link_info *info; + struct elf32_tic6x_link_hash_table *htab; + struct elf32_tic6x_link_hash_entry *eh; + struct elf_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_indirect) + return TRUE; + + if (h->root.type == bfd_link_hash_warning) + /* When warning symbols are created, they **replace** the "real" + entry in the hash table, thus we never get to see the real + symbol in a hash traversal. So look at it now. */ + h = (struct elf_link_hash_entry *) h->root.u.i.link; + eh = (struct elf32_tic6x_link_hash_entry *) h; + + info = (struct bfd_link_info *) inf; + htab = elf32_tic6x_hash_table (info); + + if (htab->elf.dynamic_sections_created && h->plt.refcount > 0) + { + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + if (info->shared + || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h)) + { + asection *s = htab->elf.splt; + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->size == 0) + s->size += PLT_ENTRY_SIZE; + + h->plt.offset = s->size; + + /* If this symbol is not defined in a regular file, and we are + not generating a shared library, then set the symbol to this + location in the .plt. This is required to make function + pointers compare as equal between the normal executable and + the shared library. */ + if (! info->shared && !h->def_regular) + { + h->root.u.def.section = s; + h->root.u.def.value = h->plt.offset; + } + + /* Make room for this entry. */ + s->size += PLT_ENTRY_SIZE; + /* We also need to make an entry in the .got.plt section, which + will be placed in the .got section by the linker script. */ + htab->elf.sgotplt->size += 4; + /* We also need to make an entry in the .rel.plt section. */ + htab->elf.srelplt->size += sizeof (Elf32_External_Rela); + } + else + { + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + } + else + { + h->plt.offset = (bfd_vma) -1; + h->needs_plt = 0; + } + + if (h->got.refcount > 0) + { + asection *s; + + /* Make sure this symbol is output as a dynamic symbol. + Undefined weak syms won't yet be marked as dynamic. */ + if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + + s = htab->elf.sgot; + h->got.offset = s->size; + s->size += 4; + + if (!(ELF_ST_VISIBILITY (h->other) + && h->root.type == bfd_link_hash_undefweak)) + htab->elf.srelgot->size += sizeof (Elf32_External_Rela); + } + else + h->got.offset = (bfd_vma) -1; + + if (eh->dyn_relocs == NULL) + return TRUE; + + /* Discard relocs on undefined weak syms with non-default + visibility. */ + if (info->shared || elf32_tic6x_using_dsbt (htab->obfd)) + { + /* We use the pc_count field to hold the number of + R_C6000_DSBT_INDEX relocs. */ + if (htab->params.dsbt_index != 0) + { + struct elf_dyn_relocs **pp; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; ) + { + p->count -= p->pc_count; + p->pc_count = 0; + if (p->count == 0) + *pp = p->next; + else + pp = &p->next; + } + } + + if (eh->dyn_relocs != NULL + && h->root.type == bfd_link_hash_undefweak) + { + if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) + eh->dyn_relocs = NULL; + + /* Make sure undefined weak symbols are output as a dynamic + symbol in PIEs. */ + else if (h->dynindx == -1 + && !h->forced_local) + { + if (! bfd_elf_link_record_dynamic_symbol (info, h)) + return FALSE; + } + } + } + + /* Finally, allocate space. */ + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *sreloc; + + sreloc = elf_section_data (p->sec)->sreloc; + + BFD_ASSERT (sreloc != NULL); + sreloc->size += p->count * sizeof (Elf32_External_Rela); + } + + return TRUE; +} + +/* Find any dynamic relocs that apply to read-only sections. */ + +static bfd_boolean +elf32_tic6x_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf) +{ + struct elf32_tic6x_link_hash_entry *eh; + struct elf_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + + eh = (struct elf32_tic6x_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *s = p->sec->output_section; + + if (s != NULL && (s->flags & SEC_READONLY) != 0) + { + struct bfd_link_info *info = (struct bfd_link_info *) inf; + + info->flags |= DF_TEXTREL; + + /* Not an error, just cut short the traversal. */ + return FALSE; + } + } + return TRUE; +} + +/* Set the sizes of the dynamic sections. */ + +static bfd_boolean +elf32_tic6x_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) +{ + struct elf32_tic6x_link_hash_table *htab; + bfd *dynobj; + asection *s; + bfd_boolean relocs; + bfd *ibfd; + + htab = elf32_tic6x_hash_table (info); + dynobj = htab->elf.dynobj; + if (dynobj == NULL) + abort (); + + if (htab->elf.dynamic_sections_created) + { + /* Set the contents of the .interp section to the interpreter. */ + if (info->executable) + { + s = bfd_get_section_by_name (dynobj, ".interp"); + if (s == NULL) + abort (); + s->size = sizeof ELF_DYNAMIC_INTERPRETER; + s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; + } + } + + /* Set up .got offsets for local syms, and space for local dynamic + relocs. */ + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) + { + bfd_signed_vma *local_got; + bfd_signed_vma *end_local_got; + char *local_tls_type; + bfd_vma *local_tlsdesc_gotent; + bfd_size_type locsymcount; + Elf_Internal_Shdr *symtab_hdr; + asection *srel; + + for (s = ibfd->sections; s != NULL; s = s->next) + { + struct elf_dyn_relocs *p; + + for (p = ((struct elf_dyn_relocs *) + elf_section_data (s)->local_dynrel); + p != NULL; + p = p->next) + { + if (!bfd_is_abs_section (p->sec) + && bfd_is_abs_section (p->sec->output_section)) + { + /* Input section has been discarded, either because + it is a copy of a linkonce section or due to + linker script /DISCARD/, so we'll be discarding + the relocs too. */ + } + else if (p->count != 0) + { + srel = elf_section_data (p->sec)->sreloc; + srel->size += p->count * sizeof (Elf32_External_Rela); + if ((p->sec->output_section->flags & SEC_READONLY) != 0) + info->flags |= DF_TEXTREL; + } + } + } + + local_got = elf_local_got_refcounts (ibfd); + if (!local_got) + continue; + + symtab_hdr = &elf_symtab_hdr (ibfd); + locsymcount = symtab_hdr->sh_info; + end_local_got = local_got + locsymcount; + s = htab->elf.sgot; + srel = htab->elf.srelgot; + for (; local_got < end_local_got; + ++local_got, ++local_tls_type, ++local_tlsdesc_gotent) + { + if (*local_got > 0) + { + *local_got = s->size; + s->size += 4; + + if (info->shared || elf32_tic6x_using_dsbt (output_bfd)) + { + srel->size += sizeof (Elf32_External_Rela); + } + } + else + *local_got = (bfd_vma) -1; + } + } + + /* Allocate global sym .plt and .got entries, and space for global + sym dynamic relocs. */ + elf_link_hash_traverse (&htab->elf, elf32_tic6x_allocate_dynrelocs, info); + + /* We now have determined the sizes of the various dynamic sections. + Allocate memory for them. */ + relocs = FALSE; + for (s = dynobj->sections; s != NULL; s = s->next) + { + bfd_boolean strip_section = TRUE; + + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + if (s == htab->dsbt) + s->size = 4 * htab->params.dsbt_size; + else if (s == htab->elf.splt + || s == htab->elf.sgot + || s == htab->elf.sgotplt + || s == htab->sdynbss) + { + /* Strip this section if we don't need it; see the + comment below. */ + /* We'd like to strip these sections if they aren't needed, but if + we've exported dynamic symbols from them we must leave them. + It's too late to tell BFD to get rid of the symbols. */ + + if (htab->elf.hplt != NULL) + strip_section = FALSE; + + /* Round up the size of the PLT section to a multiple of 32. */ + if (s == htab->elf.splt && s->size > 0) + s->size = (s->size + 31) & ~(bfd_vma)31; + } + else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rela")) + { + if (s->size != 0 + && s != htab->elf.srelplt) + relocs = 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 + { + /* 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 .rel.bss and + .rel.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. */ + if (strip_section) + s->flags |= SEC_EXCLUDE; + continue; + } + + if ((s->flags & SEC_HAS_CONTENTS) == 0) + continue; + + /* Allocate memory for the section contents. We use bfd_zalloc + here in case unused entries are not reclaimed before the + section's contents are written out. This should not happen, + but this way if it does, we get a R_C6000_NONE reloc instead + of garbage. */ + s->contents = bfd_zalloc (dynobj, s->size); + if (s->contents == NULL) + return FALSE; + } + + if (htab->elf.dynamic_sections_created) + { + /* Add some entries to the .dynamic section. We fill in the + values later, in elf32_tic6x_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->executable) + { + if (!add_dynamic_entry (DT_DEBUG, 0)) + return FALSE; + } + + if (!add_dynamic_entry (DT_C6000_DSBT_BASE, 0) + || !add_dynamic_entry (DT_C6000_DSBT_SIZE, htab->params.dsbt_size) + || !add_dynamic_entry (DT_C6000_DSBT_INDEX, + htab->params.dsbt_index)) + return FALSE; + + if (htab->elf.splt->size != 0) + { + 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 any dynamic relocs apply to a read-only section, + then we need a DT_TEXTREL entry. */ + if ((info->flags & DF_TEXTREL) == 0) + elf_link_hash_traverse (&htab->elf, + elf32_tic6x_readonly_dynrelocs, info); + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return FALSE; + } + } + } +#undef add_dynamic_entry + + return TRUE; +} + +/* This function is called after all the input files have been read, + and the input sections have been assigned to output sections. */ + +static bfd_boolean +elf32_tic6x_always_size_sections (bfd *output_bfd, struct bfd_link_info *info) +{ + if (elf32_tic6x_using_dsbt (output_bfd) && !info->relocatable) + { + struct elf_link_hash_entry *h; + + /* Force a PT_GNU_STACK segment to be created. */ + if (! elf_tdata (output_bfd)->stack_flags) + elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X; + + /* Define __stacksize if it's not defined yet. */ + h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", + FALSE, FALSE, FALSE); + if (! h || h->root.type != bfd_link_hash_defined + || h->type != STT_OBJECT + || !h->def_regular) + { + struct bfd_link_hash_entry *bh = NULL; + + if (!(_bfd_generic_link_add_one_symbol + (info, output_bfd, "__stacksize", + BSF_GLOBAL, bfd_abs_section_ptr, DEFAULT_STACK_SIZE, + (const char *) NULL, FALSE, + get_elf_backend_data (output_bfd)->collect, &bh))) + return FALSE; + + h = (struct elf_link_hash_entry *) bh; + h->def_regular = 1; + h->type = STT_OBJECT; + } + } + return TRUE; +} + +static bfd_boolean +elf32_tic6x_modify_program_headers (bfd *output_bfd, + struct bfd_link_info *info) +{ + struct elf_obj_tdata *tdata = elf_tdata (output_bfd); + struct elf_segment_map *m; + Elf_Internal_Phdr *p; + + /* objcopy and strip preserve what's already there using + elf32_tic6x_copy_private_bfd_data (). */ + if (! info) + return TRUE; + + for (p = tdata->phdr, m = tdata->segment_map; m != NULL; m = m->next, p++) + if (m->p_type == PT_GNU_STACK) + break; + + if (m) + { + struct elf_link_hash_entry *h; + + /* Obtain the pointer to the __stacksize symbol. */ + h = elf_link_hash_lookup (elf_hash_table (info), "__stacksize", + FALSE, FALSE, FALSE); + if (h) + { + 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; + BFD_ASSERT (h->root.type == bfd_link_hash_defined); + } + + /* Set the header p_memsz from the symbol value. We + intentionally ignore the symbol section. */ + if (h && h->root.type == bfd_link_hash_defined) + p->p_memsz = h->root.u.def.value; + else + p->p_memsz = DEFAULT_STACK_SIZE; + + p->p_align = 8; + } + + return TRUE; +} + +static bfd_boolean +elf32_tic6x_finish_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info) +{ + struct elf32_tic6x_link_hash_table *htab; + bfd *dynobj; + asection *sdyn; + + htab = elf32_tic6x_hash_table (info); + dynobj = htab->elf.dynobj; + sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); + + if (elf_hash_table (info)->dynamic_sections_created) + { + Elf32_External_Dyn * dyncon; + Elf32_External_Dyn * dynconend; + + BFD_ASSERT (sdyn != NULL); + + dyncon = (Elf32_External_Dyn *) sdyn->contents; + dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size); + + for (; dyncon < dynconend; dyncon++) + { + Elf_Internal_Dyn dyn; + asection *s; + + bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); + + switch (dyn.d_tag) + { + default: + break; + + case DT_C6000_DSBT_BASE: + s = htab->dsbt; + dyn.d_un.d_ptr = (s->output_section->vma + s->output_offset); + break; + + case DT_PLTGOT: + s = htab->elf.sgotplt; + dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; + break; + + case DT_JMPREL: + s = htab->elf.srelplt; + dyn.d_un.d_ptr = s->output_section->vma + s->output_offset; + break; + + case DT_PLTRELSZ: + s = htab->elf.srelplt; + dyn.d_un.d_val = s->size; + break; + } + bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); + } + + /* Fill in the first entry in the procedure linkage table. */ + if (htab->elf.splt && htab->elf.splt->size > 0) + { + bfd_vma got_offs = (htab->elf.sgotplt->output_section->vma + + htab->elf.sgotplt->output_offset + - htab->dsbt->output_section->vma + - htab->dsbt->output_offset) / 4; + + /* ldw .D2T2 *+b14[$GOT(0)],b2 */ + bfd_put_32 (output_bfd, got_offs << 8 | 0x0100006e, + htab->elf.splt->contents); + /* ldw .D2T2 *+b14[$GOT(4)],b1 */ + bfd_put_32 (output_bfd, (got_offs + 1) << 8 | 0x0080006e, + htab->elf.splt->contents + 4); + /* nop 3 */ + bfd_put_32 (output_bfd, 0x00004000, + htab->elf.splt->contents + 8); + /* b .s2 b2 */ + bfd_put_32 (output_bfd, 0x00080362, + htab->elf.splt->contents + 12); + /* nop 5 */ + bfd_put_32 (output_bfd, 0x00008000, + htab->elf.splt->contents + 16); + + elf_section_data (htab->elf.splt->output_section) + ->this_hdr.sh_entsize = PLT_ENTRY_SIZE; + } + } + + return TRUE; +} + +/* Return address for Ith PLT stub in section PLT, for relocation REL + or (bfd_vma) -1 if it should not be included. */ + +static bfd_vma +elf32_tic6x_plt_sym_val (bfd_vma i, const asection *plt, + const arelent *rel ATTRIBUTE_UNUSED) +{ + return plt->vma + (i + 1) * PLT_ENTRY_SIZE; +} + static int elf32_tic6x_obj_attrs_arg_type (int tag) { @@ -1993,6 +3816,48 @@ elf32_tic6x_merge_private_bfd_data (bfd *ibfd, bfd *obfd) return TRUE; } +static bfd_boolean +elf32_tic6x_copy_private_data (bfd * ibfd, bfd * obfd) +{ + _bfd_elf_copy_private_bfd_data (ibfd, obfd); + + if (! is_tic6x_elf (ibfd) || ! is_tic6x_elf (obfd)) + return TRUE; + + /* Copy the stack size. */ + if (elf_tdata (ibfd)->phdr && elf_tdata (obfd)->phdr + && elf32_tic6x_using_dsbt (ibfd) && elf32_tic6x_using_dsbt (obfd)) + { + unsigned i; + + for (i = 0; i < elf_elfheader (ibfd)->e_phnum; i++) + if (elf_tdata (ibfd)->phdr[i].p_type == PT_GNU_STACK) + { + Elf_Internal_Phdr *iphdr = &elf_tdata (ibfd)->phdr[i]; + + for (i = 0; i < elf_elfheader (obfd)->e_phnum; i++) + if (elf_tdata (obfd)->phdr[i].p_type == PT_GNU_STACK) + { + memcpy (&elf_tdata (obfd)->phdr[i], iphdr, sizeof (*iphdr)); + + /* Rewrite the phdrs, since we're only called after they + were first written. */ + if (bfd_seek (obfd, + (bfd_signed_vma) get_elf_backend_data (obfd) + ->s->sizeof_ehdr, SEEK_SET) != 0 + || get_elf_backend_data (obfd)->s + ->write_out_phdrs (obfd, elf_tdata (obfd)->phdr, + elf_elfheader (obfd)->e_phnum) != 0) + return FALSE; + break; + } + + break; + } + } + + return TRUE; +} #define TARGET_LITTLE_SYM bfd_elf32_tic6x_le_vec #define TARGET_LITTLE_NAME "elf32-tic6x-le" @@ -2001,11 +3866,14 @@ elf32_tic6x_merge_private_bfd_data (bfd *ibfd, bfd *obfd) #define ELF_ARCH bfd_arch_tic6x #define ELF_TARGET_ID TIC6X_ELF_DATA #define ELF_MACHINE_CODE EM_TI_C6000 -#define ELF_MAXPAGESIZE 1 +#define ELF_MAXPAGESIZE 0x1000 #define bfd_elf32_bfd_reloc_type_lookup elf32_tic6x_reloc_type_lookup #define bfd_elf32_bfd_reloc_name_lookup elf32_tic6x_reloc_name_lookup +#define bfd_elf32_bfd_copy_private_bfd_data elf32_tic6x_copy_private_data #define bfd_elf32_bfd_merge_private_bfd_data elf32_tic6x_merge_private_bfd_data #define bfd_elf32_mkobject elf32_tic6x_mkobject +#define bfd_elf32_bfd_link_hash_table_create elf32_tic6x_link_hash_table_create +#define bfd_elf32_bfd_link_hash_table_free elf32_tic6x_link_hash_table_free #define bfd_elf32_new_section_hook elf32_tic6x_new_section_hook #define elf_backend_can_gc_sections 1 #define elf_backend_default_use_rela_p 1 @@ -2017,9 +3885,41 @@ elf32_tic6x_merge_private_bfd_data (bfd *ibfd, bfd *obfd) #define elf_backend_obj_attrs_section ".c6xabi.attributes" #define elf_backend_obj_attrs_section_type SHT_C6000_ATTRIBUTES #define elf_backend_obj_attrs_vendor "c6xabi" +#define elf_backend_can_refcount 1 +#define elf_backend_want_got_plt 1 +#define elf_backend_want_dynbss 1 +#define elf_backend_plt_readonly 1 #define elf_backend_rela_normal 1 +#define elf_backend_got_header_size 8 +#define elf_backend_gc_sweep_hook elf32_tic6x_gc_sweep_hook +#define elf_backend_modify_program_headers \ + elf32_tic6x_modify_program_headers +#define elf_backend_create_dynamic_sections \ + elf32_tic6x_create_dynamic_sections +#define elf_backend_adjust_dynamic_symbol \ + elf32_tic6x_adjust_dynamic_symbol +#define elf_backend_check_relocs elf32_tic6x_check_relocs +#define elf_backend_add_symbol_hook elf32_tic6x_add_symbol_hook +#define elf_backend_symbol_processing elf32_tic6x_symbol_processing +#define elf_backend_link_output_symbol_hook \ + elf32_tic6x_link_output_symbol_hook +#define elf_backend_section_from_bfd_section \ + elf32_tic6x_section_from_bfd_section #define elf_backend_relocate_section elf32_tic6x_relocate_section +#define elf_backend_finish_dynamic_symbol \ + elf32_tic6x_finish_dynamic_symbol +#define elf_backend_always_size_sections \ + elf32_tic6x_always_size_sections +#define elf_backend_size_dynamic_sections \ + elf32_tic6x_size_dynamic_sections +#define elf_backend_finish_dynamic_sections \ + elf32_tic6x_finish_dynamic_sections #define elf_info_to_howto elf32_tic6x_info_to_howto #define elf_info_to_howto_rel elf32_tic6x_info_to_howto_rel +#undef elf_backend_omit_section_dynsym +#define elf_backend_omit_section_dynsym elf32_tic6x_link_omit_section_dynsym +#define elf_backend_plt_sym_val elf32_tic6x_plt_sym_val + + #include "elf32-target.h" |