diff options
| author | Andreas Jaeger <aj@suse.de> | 2002-02-21 15:31:53 +0000 |
|---|---|---|
| committer | Andreas Jaeger <aj@suse.de> | 2002-02-21 15:31:53 +0000 |
| commit | 2bed72a6f9662cfbb3a60a0856d1b0e611e161db (patch) | |
| tree | cbca81e5b8ff4c59d239643cfbf4b5f5ad13eac6 /bfd | |
| parent | 5526a9840576a0705172b2bd4b919467a0dcc980 (diff) | |
| download | gdb-2bed72a6f9662cfbb3a60a0856d1b0e611e161db.tar.gz | |
* elf64-x86-64.c: Major rework that introduces all recent changes
to the x86-64 backend. Get a closer match to elf32-i386.
(struct elf64_x86_64_dyn_relocs): Rename from
elf64_x86_64_pcrel_relocs_copied, add additional fields. Change
all users.
(struct elf64_x86_64_link_hash_table): Add short cuts to some
sections.
(link_hash_newfunc): Rename from elf64_x86_64_link_hash_newfunc,
remove casts, initialize new hash members.
(create_got_section): New.
(elf64_x86_64_create_dynamic_sections): New.
(elf64_x86_64_copy_indirect_symbol): New.
(elf64_x86_64_check_relocs): Don't allocate space for dynamic
relocs, .got or .relgot here but do it in allocate_dynrelocs.
Reference count possible .plt and .got entries. Don't test input
section SEC_READONLY here to try to avoid copy relocs, and keep
dyn_relocs regardless of ELF_LINK_NON_GOT_REF. Don't set
DF_TEXTREL here. Delay setting of variables until needed. Cache
pointer to "sreloc" section in elf_section_data. Tweak condition
under which .got created. Report files with bad relocation
section names.
(elf64_x86_64_gc_sweep_hook): Sweep dyn_relocs and local_dynrel.
Reference count possible .plt entries. Don't deallocate .got and
.relgot space here.
(elf64_x86_64_adjust_dynamic_symbol): Handle nocopyreloc. Don't
do copy reloc processing for weakdefs. Remove redundant casts and
aborts. Delay setting of vars until needed. Move creation of
dynamic symbols and allocation of .plt and .rela.plt to
allocate_dynrelocs. Replace BFD_ASSERT with abort.
(WILL_CALL_FINISH_DYNAMIC_SYMBOL): New.
(allocate_dynrelocs): New.
(readonly_dynrelocs): New.
(elf64_x86_64_size_dynamic_sections): Call readonly_dynrelocs.
Allocate space for dyn relocs. Replace BFD_ASSERT with abort.
Zero out the dynamic allocated content space.
(elf64_x86_64_discard_copies): Removed.
(elf64_x86_64_relocate_section): Make use of dynamic section
short-cuts. Localise vars, and delay setting. Better error
reporting, replace BFD_ASSERT with abort. Check
ELF_LINK_HASH_DEF_DYNAMIC to see if a symbol is not defined in the
regular object file and tread the weak definition as the normal
one. Don't discard relocs for undefweak or undefined symbols and
check !DEF_REGULAR as well as DEF_DYNAMIC in test for avoided copy
relocs.
(elf64_x86_64_finish_dynamic_symbol): Don't copy relocs for
symbols that have been forced local. Use same test to decide if
we can use a relative reloc for got as relocate_section. Expand
SHN_UNDEF comment. Move expressions out of function calls.
Replace BFD_ASSERT with abort.
(bfd_elf64_bfd_final_link): Removed.
(elf_backend_copy_indirect_symbol): Define.
Diffstat (limited to 'bfd')
| -rw-r--r-- | bfd/ChangeLog | 56 | ||||
| -rw-r--r-- | bfd/elf64-x86-64.c | 1765 |
2 files changed, 1080 insertions, 741 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index afa94cd7409..c6fca849c42 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,10 +1,64 @@ +2002-02-21 Andreas Jaeger <aj@suse.de> + + * elf64-x86-64.c: Major rework that introduces all recent changes + to the x86-64 backend. Get a closer match to elf32-i386. + (struct elf64_x86_64_dyn_relocs): Rename from + elf64_x86_64_pcrel_relocs_copied, add additional fields. Change + all users. + (struct elf64_x86_64_link_hash_table): Add short cuts to some + sections. + (link_hash_newfunc): Rename from elf64_x86_64_link_hash_newfunc, + remove casts, initialize new hash members. + (create_got_section): New. + (elf64_x86_64_create_dynamic_sections): New. + (elf64_x86_64_copy_indirect_symbol): New. + (elf64_x86_64_check_relocs): Don't allocate space for dynamic + relocs, .got or .relgot here but do it in allocate_dynrelocs. + Reference count possible .plt and .got entries. Don't test input + section SEC_READONLY here to try to avoid copy relocs, and keep + dyn_relocs regardless of ELF_LINK_NON_GOT_REF. Don't set + DF_TEXTREL here. Delay setting of variables until needed. Cache + pointer to "sreloc" section in elf_section_data. Tweak condition + under which .got created. Report files with bad relocation + section names. + (elf64_x86_64_gc_sweep_hook): Sweep dyn_relocs and local_dynrel. + Reference count possible .plt entries. Don't deallocate .got and + .relgot space here. + (elf64_x86_64_adjust_dynamic_symbol): Handle nocopyreloc. Don't + do copy reloc processing for weakdefs. Remove redundant casts and + aborts. Delay setting of vars until needed. Move creation of + dynamic symbols and allocation of .plt and .rela.plt to + allocate_dynrelocs. Replace BFD_ASSERT with abort. + (WILL_CALL_FINISH_DYNAMIC_SYMBOL): New. + (allocate_dynrelocs): New. + (readonly_dynrelocs): New. + (elf64_x86_64_size_dynamic_sections): Call readonly_dynrelocs. + Allocate space for dyn relocs. Replace BFD_ASSERT with abort. + Zero out the dynamic allocated content space. + (elf64_x86_64_discard_copies): Removed. + (elf64_x86_64_relocate_section): Make use of dynamic section + short-cuts. Localise vars, and delay setting. Better error + reporting, replace BFD_ASSERT with abort. Check + ELF_LINK_HASH_DEF_DYNAMIC to see if a symbol is not defined in the + regular object file and tread the weak definition as the normal + one. Don't discard relocs for undefweak or undefined symbols and + check !DEF_REGULAR as well as DEF_DYNAMIC in test for avoided copy + relocs. + (elf64_x86_64_finish_dynamic_symbol): Don't copy relocs for + symbols that have been forced local. Use same test to decide if + we can use a relative reloc for got as relocate_section. Expand + SHN_UNDEF comment. Move expressions out of function calls. + Replace BFD_ASSERT with abort. + (bfd_elf64_bfd_final_link): Removed. + (elf_backend_copy_indirect_symbol): Define. + 2002-02-20 Tom Rix <trix@redhat.com> * coff-rs6000.c (xcoff_howto_table): Add 16 bit R_BA. (_bfd_xcoff_reloc_type_lookup): Use it. * coff64-rs6000.c (xcoff64_howto_table): Same. (xcoff64_reloc_type_lookup): Same. - + 2002-02-20 Peter Schauer <pes@regent.e-technik.tu-muenchen.de> * osf-core.c (osf_core_vec): OSF/1 (Digital Unix) core files are diff --git a/bfd/elf64-x86-64.c b/bfd/elf64-x86-64.c index cdd36d1623f..32bf260483d 100644 --- a/bfd/elf64-x86-64.c +++ b/bfd/elf64-x86-64.c @@ -1,5 +1,5 @@ /* X86-64 specific support for 64-bit ELF - Copyright 2000, 2001 Free Software Foundation, Inc. + Copyright 2000, 2001, 2002 Free Software Foundation, Inc. Contributed by Jan Hubicka <jh@suse.cz>. This file is part of BFD, the Binary File Descriptor library. @@ -20,13 +20,14 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" +#include "bfdlink.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/x86-64.h" /* We use only the RELA entries. */ -#define USE_RELA +#define USE_RELA 1 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */ #define MINUS_ONE (~ (bfd_vma) 0) @@ -127,6 +128,12 @@ static void elf64_x86_64_info_to_howto static struct bfd_link_hash_table *elf64_x86_64_link_hash_table_create PARAMS ((bfd *)); static boolean elf64_x86_64_elf_object_p PARAMS ((bfd *abfd)); +static boolean create_got_section + PARAMS((bfd *, struct bfd_link_info *)); +static boolean elf64_x86_64_create_dynamic_sections + PARAMS((bfd *, struct bfd_link_info *)); +static void elf64_x86_64_copy_indirect_symbol + PARAMS ((struct elf_link_hash_entry *, struct elf_link_hash_entry *)); static boolean elf64_x86_64_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *sec, const Elf_Internal_Rela *)); @@ -138,11 +145,15 @@ static boolean elf64_x86_64_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); -static struct bfd_hash_entry *elf64_x86_64_link_hash_newfunc +static struct bfd_hash_entry *link_hash_newfunc PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); static boolean elf64_x86_64_adjust_dynamic_symbol PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); +static boolean allocate_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); +static boolean readonly_dynrelocs + PARAMS ((struct elf_link_hash_entry *, PTR)); static boolean elf64_x86_64_size_dynamic_sections PARAMS ((bfd *, struct bfd_link_info *)); static boolean elf64_x86_64_relocate_section @@ -235,53 +246,54 @@ static const bfd_byte elf64_x86_64_plt_entry[PLT_ENTRY_SIZE] = }; /* The x86-64 linker needs to keep track of the number of relocs that - it decides to copy in check_relocs for each symbol. This is so - that it can discard PC relative relocs if it doesn't need them when - linking with -Bsymbolic. We store the information in a field - extending the regular ELF linker hash table. */ + decides to copy as dynamic relocs in check_relocs for each symbol. + This is so that it can later discard them if they are found to be + unnecessary. We store the information in a field extending the + regular ELF linker hash table. */ -/* This structure keeps track of the number of PC relative relocs we - have copied for a given symbol. */ - -struct elf64_x86_64_pcrel_relocs_copied +struct elf64_x86_64_dyn_relocs { /* Next section. */ - struct elf64_x86_64_pcrel_relocs_copied *next; - /* A section in dynobj. */ - asection *section; - /* Number of relocs copied in this section. */ + struct elf64_x86_64_dyn_relocs *next; + + /* The input section of the reloc. */ + asection *sec; + + /* Total number of relocs copied for the input section. */ bfd_size_type count; + + /* Number of pc-relative relocs copied for the input section. */ + bfd_size_type pc_count; }; /* x86-64 ELF linker hash entry. */ struct elf64_x86_64_link_hash_entry { - struct elf_link_hash_entry root; + struct elf_link_hash_entry elf; - /* Number of PC relative relocs copied for this symbol. */ - struct elf64_x86_64_pcrel_relocs_copied *pcrel_relocs_copied; + /* Track dynamic relocs copied for this symbol. */ + struct elf64_x86_64_dyn_relocs *dyn_relocs; }; -/* x86-64 ELF linker hash table. */ +/* x86-64 ELF linker hash table. */ struct elf64_x86_64_link_hash_table { - struct elf_link_hash_table root; -}; - -/* Declare this now that the above structures are defined. */ + struct elf_link_hash_table elf; -static boolean elf64_x86_64_discard_copies - PARAMS ((struct elf64_x86_64_link_hash_entry *, PTR)); - -/* Traverse an x86-64 ELF linker hash table. */ + /* Short-cuts to get to dynamic linker sections. */ + asection *sgot; + asection *sgotplt; + asection *srelgot; + asection *splt; + asection *srelplt; + asection *sdynbss; + asection *srelbss; -#define elf64_x86_64_link_hash_traverse(table, func, info) \ - (elf_link_hash_traverse \ - (&(table)->root, \ - (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ - (info))) + /* Small local sym to section mapping cache. */ + struct sym_sec_cache sym_sec; +}; /* Get the x86-64 ELF linker hash table from a link_info structure. */ @@ -291,33 +303,32 @@ static boolean elf64_x86_64_discard_copies /* Create an entry in an x86-64 ELF linker hash table. */ static struct bfd_hash_entry * -elf64_x86_64_link_hash_newfunc (entry, table, string) +link_hash_newfunc (entry, table, string) struct bfd_hash_entry *entry; struct bfd_hash_table *table; const char *string; { - struct elf64_x86_64_link_hash_entry *ret = - (struct elf64_x86_64_link_hash_entry *) entry; - /* Allocate the structure if it has not already been allocated by a - subclass. */ - if (ret == (struct elf64_x86_64_link_hash_entry *) NULL) - ret = ((struct elf64_x86_64_link_hash_entry *) - bfd_hash_allocate (table, - sizeof (struct elf64_x86_64_link_hash_entry))); - if (ret == (struct elf64_x86_64_link_hash_entry *) NULL) - return (struct bfd_hash_entry *) ret; + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, + sizeof (struct elf64_x86_64_link_hash_entry)); + if (entry == NULL) + return entry; + } /* Call the allocation method of the superclass. */ - ret = ((struct elf64_x86_64_link_hash_entry *) - _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, - table, string)); - if (ret != (struct elf64_x86_64_link_hash_entry *) NULL) + entry = _bfd_elf_link_hash_newfunc (entry, table, string); + if (entry != NULL) { - ret->pcrel_relocs_copied = NULL; + struct elf64_x86_64_link_hash_entry *eh; + + eh = (struct elf64_x86_64_link_hash_entry *) entry; + eh->dyn_relocs = NULL; } - return (struct bfd_hash_entry *) ret; + return entry; } /* Create an X86-64 ELF linker hash table. */ @@ -329,18 +340,135 @@ elf64_x86_64_link_hash_table_create (abfd) struct elf64_x86_64_link_hash_table *ret; bfd_size_type amt = sizeof (struct elf64_x86_64_link_hash_table); - ret = ((struct elf64_x86_64_link_hash_table *) bfd_alloc (abfd, amt)); - if (ret == (struct elf64_x86_64_link_hash_table *) NULL) + ret = (struct elf64_x86_64_link_hash_table *) bfd_alloc (abfd, amt); + if (ret == NULL) return NULL; - if (! _bfd_elf_link_hash_table_init (&ret->root, abfd, - elf64_x86_64_link_hash_newfunc)) + if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc)) { bfd_release (abfd, ret); return NULL; } - return &ret->root.root; + ret->sgot = NULL; + ret->sgotplt = NULL; + ret->srelgot = NULL; + ret->splt = NULL; + ret->srelplt = NULL; + ret->sdynbss = NULL; + ret->srelbss = NULL; + ret->sym_sec.abfd = NULL; + + return &ret->elf.root; +} + +/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up + shortcuts to them in our hash table. */ + +static boolean +create_got_section (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + struct elf64_x86_64_link_hash_table *htab; + + if (! _bfd_elf_create_got_section (dynobj, info)) + return false; + + htab = elf64_x86_64_hash_table (info); + htab->sgot = bfd_get_section_by_name (dynobj, ".got"); + htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt"); + if (!htab->sgot || !htab->sgotplt) + abort (); + + htab->srelgot = bfd_make_section (dynobj, ".rela.got"); + if (htab->srelgot == NULL + || ! bfd_set_section_flags (dynobj, htab->srelgot, + (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS + | SEC_IN_MEMORY | SEC_LINKER_CREATED + | SEC_READONLY)) + || ! bfd_set_section_alignment (dynobj, htab->srelgot, 3)) + return false; + return true; +} + +/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and + .rela.bss sections in DYNOBJ, and set up shortcuts to them in our + hash table. */ + +static boolean +elf64_x86_64_create_dynamic_sections (dynobj, info) + bfd *dynobj; + struct bfd_link_info *info; +{ + struct elf64_x86_64_link_hash_table *htab; + + htab = elf64_x86_64_hash_table (info); + if (!htab->sgot && !create_got_section (dynobj, info)) + return false; + + if (!_bfd_elf_create_dynamic_sections (dynobj, info)) + return false; + + htab->splt = bfd_get_section_by_name (dynobj, ".plt"); + htab->srelplt = bfd_get_section_by_name (dynobj, ".rela.plt"); + htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); + if (!info->shared) + htab->srelbss = bfd_get_section_by_name (dynobj, ".rela.bss"); + + if (!htab->splt || !htab->srelplt || !htab->sdynbss + || (!info->shared && !htab->srelbss)) + abort (); + + return true; +} + +/* Copy the extra info we tack onto an elf_link_hash_entry. */ + +static void +elf64_x86_64_copy_indirect_symbol (dir, ind) + struct elf_link_hash_entry *dir, *ind; +{ + struct elf64_x86_64_link_hash_entry *edir, *eind; + + edir = (struct elf64_x86_64_link_hash_entry *) dir; + eind = (struct elf64_x86_64_link_hash_entry *) ind; + + if (eind->dyn_relocs != NULL) + { + if (edir->dyn_relocs != NULL) + { + struct elf64_x86_64_dyn_relocs **pp; + struct elf64_x86_64_dyn_relocs *p; + + if (ind->root.type == bfd_link_hash_indirect) + abort (); + + /* Add reloc counts against the weak sym to the strong sym + list. Merge any entries against the same section. */ + for (pp = &eind->dyn_relocs; (p = *pp) != NULL; ) + { + struct elf64_x86_64_dyn_relocs *q; + + for (q = edir->dyn_relocs; q != NULL; q = q->next) + if (q->sec == p->sec) + { + q->pc_count += p->pc_count; + q->count += p->count; + *pp = p->next; + break; + } + if (q == NULL) + pp = &p->next; + } + *pp = edir->dyn_relocs; + } + + edir->dyn_relocs = eind->dyn_relocs; + eind->dyn_relocs = NULL; + } + + _bfd_elf_link_hash_copy_indirect (dir, ind); } static boolean @@ -353,8 +481,8 @@ elf64_x86_64_elf_object_p (abfd) } /* Look through the relocs for a section during the first phase, and - allocate space in the global offset table or procedure linkage - table. */ + calculate needed space in the global offset table, procedure + linkage table, and dynamic reloc sections. */ static boolean elf64_x86_64_check_relocs (abfd, info, sec, relocs) @@ -363,25 +491,22 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) asection *sec; const Elf_Internal_Rela *relocs; { - bfd *dynobj; + struct elf64_x86_64_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; const Elf_Internal_Rela *rel_end; - asection *sgot; - asection *srelgot; asection *sreloc; if (info->relocateable) return true; - dynobj = elf_hash_table (info)->dynobj; + htab = elf64_x86_64_hash_table (info); symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); - local_got_refcounts = elf_local_got_refcounts (abfd); - sgot = srelgot = sreloc = NULL; + sreloc = NULL; + rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { @@ -389,75 +514,35 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) struct elf_link_hash_entry *h; r_symndx = ELF64_R_SYM (rel->r_info); + + if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr)) + { + (*_bfd_error_handler) (_("%s: bad symbol index: %d"), + bfd_archive_filename (abfd), + r_symndx); + return false; + } + if (r_symndx < symtab_hdr->sh_info) h = NULL; else h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - /* Some relocs require a global offset table. */ - if (dynobj == NULL) - { - switch (ELF64_R_TYPE (rel->r_info)) - { - case R_X86_64_GOT32: - case R_X86_64_GOTPCREL: - elf_hash_table (info)->dynobj = dynobj = abfd; - if (! _bfd_elf_create_got_section (dynobj, info)) - return false; - break; - } - } - switch (ELF64_R_TYPE (rel->r_info)) { - case R_X86_64_GOTPCREL: case R_X86_64_GOT32: + case R_X86_64_GOTPCREL: /* This symbol requires a global offset table entry. */ - - if (sgot == NULL) - { - sgot = bfd_get_section_by_name (dynobj, ".got"); - BFD_ASSERT (sgot != NULL); - } - - if (srelgot == NULL && (h != NULL || info->shared)) - { - srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); - if (srelgot == NULL) - { - srelgot = bfd_make_section (dynobj, ".rela.got"); - if (srelgot == NULL - || ! bfd_set_section_flags (dynobj, srelgot, - (SEC_ALLOC - | SEC_LOAD - | SEC_HAS_CONTENTS - | SEC_IN_MEMORY - | SEC_LINKER_CREATED - | SEC_READONLY)) - || ! bfd_set_section_alignment (dynobj, srelgot, 3)) - return false; - } - } - if (h != NULL) { - if (h->got.refcount == 0) - { - /* Make sure this symbol is output as a dynamic symbol. */ - if (h->dynindx == -1) - { - if (! bfd_elf64_link_record_dynamic_symbol (info, h)) - return false; - } - - sgot->_raw_size += GOT_ENTRY_SIZE; - srelgot->_raw_size += sizeof (Elf64_External_Rela); - } 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; @@ -470,19 +555,18 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) return false; elf_local_got_refcounts (abfd) = local_got_refcounts; } - if (local_got_refcounts[r_symndx] == 0) - { - sgot->_raw_size += GOT_ENTRY_SIZE; - if (info->shared) - { - /* If we are generating a shared object, we need to - output a R_X86_64_RELATIVE reloc so that the dynamic - linker can adjust this GOT entry. */ - srelgot->_raw_size += sizeof (Elf64_External_Rela); - } - } local_got_refcounts[r_symndx] += 1; } + /* Fall through */ + + //case R_X86_64_GOTPCREL: + if (htab->sgot == NULL) + { + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + if (!create_got_section (htab->elf.dynobj, info)) + return false; + } break; case R_X86_64_PLT32: @@ -507,9 +591,23 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) case R_X86_64_32: case R_X86_64_64: case R_X86_64_32S: + case R_X86_64_PC8: + case R_X86_64_PC16: case R_X86_64_PC32: - if (h != NULL) - h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + if (h != NULL && !info->shared) + { + /* If this reloc is in a read-only section, we might + need a copy reloc. We can't check reliably at this + stage whether the section is read-only, as input + sections have not yet been mapped to output sections. + Tentatively set the flag for now, and correct in + adjust_dynamic_symbol. */ + h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF; + + /* We may need a .plt entry if the function this reloc + refers to is in a shared lib. */ + h->plt.refcount += 1; + } /* If we are creating a shared library, and this is a reloc against a global symbol, or a non PC relative reloc @@ -520,27 +618,45 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) 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). We account for that - possibility below by storing information in the - pcrel_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 (info->shared - && (sec->flags & SEC_ALLOC) != 0 - && (((ELF64_R_TYPE (rel->r_info) != R_X86_64_PC8) - && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16) - && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32)) - || (h != NULL - && (! info->symbolic - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + 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 + && (sec->flags & SEC_ALLOC) != 0 + && (((ELF64_R_TYPE (rel->r_info) != R_X86_64_PC8) + && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC16) + && (ELF64_R_TYPE (rel->r_info) != R_X86_64_PC32)) + || (h != NULL + && (! info->symbolic + || h->root.type == bfd_link_hash_defweak + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + || (!info->shared + && (sec->flags & SEC_ALLOC) != 0 + && h != NULL + && (h->root.type == bfd_link_hash_defweak + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0))) { - /* When creating a shared object, we must copy these - reloc types into the output file. We create a reloc - section in dynobj and make room for this reloc. */ + struct elf64_x86_64_dyn_relocs *p; + struct elf64_x86_64_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) { const char *name; + bfd *dynobj; name = (bfd_elf_string_from_elf_section (abfd, @@ -549,9 +665,19 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) if (name == NULL) return false; - BFD_ASSERT (strncmp (name, ".rela", 5) == 0 - && strcmp (bfd_get_section_name (abfd, sec), - name + 5) == 0); + if (strncmp (name, ".rela", 5) != 0 + || strcmp (bfd_get_section_name (abfd, sec), + name + 5) != 0) + { + (*_bfd_error_handler) + (_("%s: bad relocation section name `%s\'"), + bfd_archive_filename (abfd), name); + } + + if (htab->elf.dynobj == NULL) + htab->elf.dynobj = abfd; + + dynobj = htab->elf.dynobj; sreloc = bfd_get_section_by_name (dynobj, name); if (sreloc == NULL) @@ -568,46 +694,51 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) || ! bfd_set_section_alignment (dynobj, sreloc, 3)) return false; } - if (sec->flags & SEC_READONLY) - info->flags |= DF_TEXTREL; + elf_section_data (sec)->sreloc = sreloc; } - sreloc->_raw_size += sizeof (Elf64_External_Rela); - - /* If this is a global symbol, we count the number of PC - relative relocations we have entered for this symbol, - so that we can discard them later as necessary. Note - that this function is only called if we are using an - elf64_x86_64 linker hash table, which means that h is - really a pointer to an elf64_x86_64_link_hash_entry. */ - if (h != NULL - && ((ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8) - || (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16) - || (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32))) + /* If this is a global symbol, we count the number of + relocations we need for this symbol. */ + if (h != NULL) { - struct elf64_x86_64_link_hash_entry *eh; - struct elf64_x86_64_pcrel_relocs_copied *p; - - eh = (struct elf64_x86_64_link_hash_entry *) h; + head = &((struct elf64_x86_64_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. */ + + asection *s; + s = bfd_section_from_r_symndx (abfd, &htab->sym_sec, + sec, r_symndx); + if (s == NULL) + return false; - for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) - if (p->section == sreloc) - break; + head = ((struct elf64_x86_64_dyn_relocs **) + &elf_section_data (s)->local_dynrel); + } + p = *head; + if (p == NULL || p->sec != sec) + { + bfd_size_type amt = sizeof *p; + p = ((struct elf64_x86_64_dyn_relocs *) + bfd_alloc (htab->elf.dynobj, amt)); if (p == NULL) - { - p = ((struct elf64_x86_64_pcrel_relocs_copied *) - bfd_alloc (dynobj, (bfd_size_type) sizeof *p)); - if (p == NULL) - return false; - p->next = eh->pcrel_relocs_copied; - eh->pcrel_relocs_copied = p; - p->section = sreloc; - p->count = 0; - } - - ++p->count; + return false; + p->next = *head; + *head = p; + p->sec = sec; + p->count = 0; + p->pc_count = 0; } + + p->count += 1; + if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8 + || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16 + || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32) + p->pc_count += 1; } break; @@ -624,6 +755,9 @@ elf64_x86_64_check_relocs (abfd, info, sec, relocs) if (!_bfd_elf64_gc_record_vtentry (abfd, sec, h, rel->r_addend)) return false; break; + + default: + break; } } @@ -637,7 +771,7 @@ static asection * elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym) bfd *abfd; struct bfd_link_info *info ATTRIBUTE_UNUSED; - Elf_Internal_Rela *rel ATTRIBUTE_UNUSED; + Elf_Internal_Rela *rel; struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; { @@ -677,7 +811,7 @@ elf64_x86_64_gc_mark_hook (abfd, info, rel, h, sym) static boolean elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs) bfd *abfd; - struct bfd_link_info *info ATTRIBUTE_UNUSED; + struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { @@ -687,21 +821,13 @@ elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs) const Elf_Internal_Rela *rel, *relend; unsigned long r_symndx; struct elf_link_hash_entry *h; - bfd *dynobj; - asection *sgot; - asection *srelgot; + + elf_section_data (sec)->local_dynrel = NULL; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); local_got_refcounts = elf_local_got_refcounts (abfd); - dynobj = elf_hash_table (info)->dynobj; - if (dynobj == NULL) - return true; - - sgot = bfd_get_section_by_name (dynobj, ".got"); - srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); - relend = relocs + sec->reloc_count; for (rel = relocs; rel < relend; rel++) switch (ELF64_R_TYPE (rel->r_info)) @@ -713,30 +839,53 @@ elf64_x86_64_gc_sweep_hook (abfd, info, sec, relocs) { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; if (h->got.refcount > 0) - { - h->got.refcount -= 1; - if (h->got.refcount == 0) - { - sgot->_raw_size -= GOT_ENTRY_SIZE; - srelgot->_raw_size -= sizeof (Elf64_External_Rela); - } - } + h->got.refcount -= 1; } else if (local_got_refcounts != NULL) { if (local_got_refcounts[r_symndx] > 0) - { - local_got_refcounts[r_symndx] -= 1; - if (local_got_refcounts[r_symndx] == 0) - { - sgot->_raw_size -= GOT_ENTRY_SIZE; - if (info->shared) - srelgot->_raw_size -= sizeof (Elf64_External_Rela); - } - } + local_got_refcounts[r_symndx] -= 1; } break; + case R_X86_64_8: + case R_X86_64_16: + case R_X86_64_32: + case R_X86_64_64: + case R_X86_64_32S: + case R_X86_64_PC8: + case R_X86_64_PC16: + case R_X86_64_PC32: + r_symndx = ELF64_R_SYM (rel->r_info); + if (r_symndx >= symtab_hdr->sh_info) + { + struct elf64_x86_64_link_hash_entry *eh; + struct elf64_x86_64_dyn_relocs **pp; + struct elf64_x86_64_dyn_relocs *p; + + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + + if (!info->shared && h->plt.refcount > 0) + h->plt.refcount -= 1; + + eh = (struct elf64_x86_64_link_hash_entry *) h; + + for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next) + if (p->sec == sec) + { + if (ELF64_R_TYPE (rel->r_info) == R_X86_64_PC8 + || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC16 + || ELF64_R_TYPE (rel->r_info) == R_X86_64_PC32) + p->pc_count -= 1; + p->count -= 1; + if (p->count == 0) + *pp = p->next; + break; + } + } + break; + + case R_X86_64_PLT32: r_symndx = ELF64_R_SYM (rel->r_info); if (r_symndx >= symtab_hdr->sh_info) @@ -765,33 +914,24 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) struct bfd_link_info *info; struct elf_link_hash_entry *h; { - bfd *dynobj; + struct elf64_x86_64_link_hash_table *htab; + struct elf64_x86_64_link_hash_entry * eh; + struct elf64_x86_64_dyn_relocs *p; asection *s; unsigned int power_of_two; - dynobj = elf_hash_table (info)->dynobj; - - /* Make sure we know what is going on here. */ - BFD_ASSERT (dynobj != NULL - && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) - || h->weakdef != NULL - || ((h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_DYNAMIC) != 0 - && (h->elf_link_hash_flags - & ELF_LINK_HASH_REF_REGULAR) != 0 - && (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0))); - /* 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->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0) { - if ((! info->shared - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 - && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) - || (info->shared && h->plt.refcount <= 0)) + if (h->plt.refcount <= 0 + || (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0 + && h->root.type != bfd_link_hash_undefweak + && h->root.type != bfd_link_hash_undefined)) { /* This case can occur if we saw a PLT32 reloc in an input file, but the symbol was never referred to by a dynamic @@ -800,55 +940,16 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) linkage table, and we can just do a PC32 reloc instead. */ h->plt.offset = (bfd_vma) -1; h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; - return true; } - /* Make sure this symbol is output as a dynamic symbol. */ - if (h->dynindx == -1) - { - if (! bfd_elf64_link_record_dynamic_symbol (info, h)) - return false; - } - - s = bfd_get_section_by_name (dynobj, ".plt"); - BFD_ASSERT (s != NULL); - - /* If this is the first .plt entry, make room for the special - first entry. */ - if (s->_raw_size == 0) - s->_raw_size = PLT_ENTRY_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->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) - { - h->root.u.def.section = s; - h->root.u.def.value = s->_raw_size; - } - - h->plt.offset = s->_raw_size; - - /* Make room for this entry. */ - s->_raw_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. */ - s = bfd_get_section_by_name (dynobj, ".got.plt"); - BFD_ASSERT (s != NULL); - s->_raw_size += GOT_ENTRY_SIZE; - - /* We also need to make an entry in the .rela.plt section. */ - s = bfd_get_section_by_name (dynobj, ".rela.plt"); - BFD_ASSERT (s != NULL); - s->_raw_size += sizeof (Elf64_External_Rela); - return true; } else + /* It's possible that we incorrectly decided a .plt reloc was + needed for an R_X86_64_PC32 reloc to a non-function sym in + check_relocs. We can't decide accurately between function and + non-function syms in check-relocs; Objects loaded later in + the link may change h->type. So fix it now. */ h->plt.offset = (bfd_vma) -1; /* If this is a weak symbol, and there is a real definition, the @@ -878,6 +979,29 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0) return true; + /* If -z nocopyreloc was given, we won't generate them either. */ + if (info->nocopyreloc) + { + h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; + return true; + } + + eh = (struct elf64_x86_64_link_hash_entry *) h; + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + s = p->sec->output_section; + if (s != NULL && (s->flags & SEC_READONLY) != 0) + break; + } + + /* If we didn't find any dynamic relocs in read-only sections, then + we'll be keeping the dynamic relocs and avoiding the copy reloc. */ + if (p == NULL) + { + h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF; + 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 @@ -888,20 +1012,14 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) both the dynamic object and the regular object will refer to the same memory location for the variable. */ - s = bfd_get_section_by_name (dynobj, ".dynbss"); - BFD_ASSERT (s != NULL); + htab = elf64_x86_64_hash_table (info); /* We must generate a R_X86_64_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. */ + runtime process image. */ if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) { - asection *srel; - - srel = bfd_get_section_by_name (dynobj, ".rela.bss"); - BFD_ASSERT (srel != NULL); - srel->_raw_size += sizeof (Elf64_External_Rela); + htab->srelbss->_raw_size += sizeof (Elf64_External_Rela); h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; } @@ -915,10 +1033,11 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) power_of_two = 4; /* Apply the required alignment. */ + s = htab->sdynbss; s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two)); - if (power_of_two > bfd_get_section_alignment (dynobj, s)) + if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s)) { - if (! bfd_set_section_alignment (dynobj, s, power_of_two)) + if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two)) return false; } @@ -932,6 +1051,218 @@ elf64_x86_64_adjust_dynamic_symbol (info, h) return true; } +/* This is the condition under which elf64_x86_64_finish_dynamic_symbol + will be called from elflink.h. If elflink.h doesn't call our + finish_dynamic_symbol routine, we'll need to do something about + initializing any .plt and .got entries in elf64_x86_64_relocate_section. */ +#define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, INFO, H) \ + ((DYN) \ + && ((INFO)->shared \ + || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \ + && ((H)->dynindx != -1 \ + || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)) + +/* Allocate space in .plt, .got and associated reloc sections for + dynamic relocs. */ + +static boolean +allocate_dynrelocs (h, inf) + struct elf_link_hash_entry *h; + PTR inf; +{ + struct bfd_link_info *info; + struct elf64_x86_64_link_hash_table *htab; + struct elf64_x86_64_link_hash_entry *eh; + struct elf64_x86_64_dyn_relocs *p; + + if (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + return true; + + info = (struct bfd_link_info *) inf; + htab = elf64_x86_64_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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, info, h)) + { + asection *s = htab->splt; + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_ENTRY_SIZE; + + h->plt.offset = s->_raw_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->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + h->root.u.def.section = s; + h->root.u.def.value = h->plt.offset; + } + + /* Make room for this entry. */ + s->_raw_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->sgotplt->_raw_size += GOT_ENTRY_SIZE; + + /* We also need to make an entry in the .rela.plt section. */ + htab->srelplt->_raw_size += sizeof (Elf64_External_Rela); + } + else + { + h->plt.offset = (bfd_vma) -1; + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; + } + } + else + { + h->plt.offset = (bfd_vma) -1; + h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; + } + + if (h->got.refcount > 0) + { + asection *s; + boolean dyn; + + /* 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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + s = htab->sgot; + h->got.offset = s->_raw_size; + s->_raw_size += GOT_ENTRY_SIZE; + dyn = htab->elf.dynamic_sections_created; + if (WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h)) + htab->srelgot->_raw_size += sizeof (Elf64_External_Rela); + } + else + h->got.offset = (bfd_vma) -1; + + eh = (struct elf64_x86_64_link_hash_entry *) h; + if (eh->dyn_relocs == NULL) + return true; + + /* In the shared -Bsymbolic case, discard space allocated for + dynamic pc-relative relocs against symbols which turn out to be + defined in regular objects. For the normal shared case, discard + space for pc-relative relocs that have become local due to symbol + visibility changes. */ + + if (info->shared) + { + if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 + && ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 + || info->symbolic)) + { + struct elf64_x86_64_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; + } + } + } + else + { + /* For the non-shared case, discard space for relocs against + symbols which turn out to need copy relocs or are not + dynamic. */ + + if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 + && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + || (htab->elf.dynamic_sections_created + && (h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined)))) + { + /* 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->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) + { + if (! bfd_elf64_link_record_dynamic_symbol (info, h)) + return false; + } + + /* If that succeeded, we know we'll be keeping all the + relocs. */ + if (h->dynindx != -1) + goto keep; + } + + eh->dyn_relocs = NULL; + + keep: ; + } + + /* Finally, allocate space. */ + for (p = eh->dyn_relocs; p != NULL; p = p->next) + { + asection *sreloc = elf_section_data (p->sec)->sreloc; + sreloc->_raw_size += p->count * sizeof (Elf64_External_Rela); + } + + return true; +} + +/* Find any dynamic relocs that apply to read-only sections. */ + +static boolean +readonly_dynrelocs (h, inf) + struct elf_link_hash_entry *h; + PTR inf; +{ + struct elf64_x86_64_link_hash_entry *eh; + struct elf64_x86_64_dyn_relocs *p; + + eh = (struct elf64_x86_64_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 boolean @@ -939,110 +1270,140 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info) bfd *output_bfd ATTRIBUTE_UNUSED; struct bfd_link_info *info; { + struct elf64_x86_64_link_hash_table *htab; bfd *dynobj; asection *s; - boolean plt; boolean relocs; + bfd *ibfd; - dynobj = elf_hash_table (info)->dynobj; - BFD_ASSERT (dynobj != NULL); + htab = elf64_x86_64_hash_table (info); + dynobj = htab->elf.dynobj; + if (dynobj == NULL) + abort (); - if (elf_hash_table (info)->dynamic_sections_created) + if (htab->elf.dynamic_sections_created) { /* Set the contents of the .interp section to the interpreter. */ if (! info->shared) { s = bfd_get_section_by_name (dynobj, ".interp"); - BFD_ASSERT (s != NULL); + if (s == NULL) + abort (); s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER; s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER; } } - else - { - /* We may have created entries in the .rela.got section. - However, if we are not creating the dynamic sections, we will - not actually use these entries. Reset the size of .rela.got, - which will cause it to get stripped from the output file - below. */ - s = bfd_get_section_by_name (dynobj, ".rela.got"); - if (s != NULL) - s->_raw_size = 0; - } - /* If this is a -Bsymbolic shared link, then we need to discard all - PC relative relocs against symbols defined in a regular object. - We allocated space for them in the check_relocs routine, but we - will not fill them in in the relocate_section routine. */ - if (info->shared) - elf64_x86_64_link_hash_traverse (elf64_x86_64_hash_table (info), - elf64_x86_64_discard_copies, - (PTR) info); - - /* The check_relocs and adjust_dynamic_symbol entry points have - determined the sizes of the various dynamic sections. Allocate - memory for them. */ - plt = relocs = false; - for (s = dynobj->sections; s != NULL; s = s->next) + /* Set up .got offsets for local syms, and space for local dynamic + relocs. */ + for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next) { - const char *name; - boolean strip; + bfd_signed_vma *local_got; + bfd_signed_vma *end_local_got; + bfd_size_type locsymcount; + Elf_Internal_Shdr *symtab_hdr; + asection *srel; - if ((s->flags & SEC_LINKER_CREATED) == 0) + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) 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); - - strip = false; - if (strcmp (name, ".plt") == 0) + for (s = ibfd->sections; s != NULL; s = s->next) { - if (s->_raw_size == 0) - { - /* Strip this section if we don't need it; see the - comment below. */ - strip = true; - } - else + struct elf64_x86_64_dyn_relocs *p; + + for (p = *((struct elf64_x86_64_dyn_relocs **) + &elf_section_data (s)->local_dynrel); + p != NULL; + p = p->next) { - /* Remember whether there is a PLT. */ - plt = true; + 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->_raw_size += p->count * sizeof (Elf64_External_Rela); + if ((p->sec->output_section->flags & SEC_READONLY) != 0) + info->flags |= DF_TEXTREL; + + } } } - else if (strncmp (name, ".rela", 5) == 0) + + local_got = elf_local_got_refcounts (ibfd); + if (!local_got) + continue; + + symtab_hdr = &elf_tdata (ibfd)->symtab_hdr; + locsymcount = symtab_hdr->sh_info; + end_local_got = local_got + locsymcount; + s = htab->sgot; + srel = htab->srelgot; + for (; local_got < end_local_got; ++local_got) { - if (s->_raw_size == 0) + if (*local_got > 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. */ - strip = true; + *local_got = s->_raw_size; + s->_raw_size += GOT_ENTRY_SIZE; + if (info->shared) + srel->_raw_size += sizeof (Elf64_External_Rela); } else - { - if (strcmp (name, ".rela.plt") != 0) - relocs = true; + *local_got = (bfd_vma) -1; + } + } - /* We use the reloc_count field as a counter if we need - to copy relocs into the output file. */ - s->reloc_count = 0; - } + /* Allocate global sym .plt and .got entries, and space for global + sym dynamic relocs. */ + elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) 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) + { + if ((s->flags & SEC_LINKER_CREATED) == 0) + continue; + + if (s == htab->splt + || s == htab->sgot + || s == htab->sgotplt) + { + /* Strip this section if we don't need it; see the + comment below. */ + } + else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0) + { + if (s->_raw_size != 0 && s != htab->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 if (strncmp (name, ".got", 4) != 0) + else { /* It's not one of our sections, so don't allocate space. */ continue; } - if (strip) + if (s->_raw_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. */ + _bfd_strip_section_from_output (info, s); continue; } @@ -1053,11 +1414,11 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info) but this way if it does, we get a R_X86_64_NONE reloc instead of garbage. */ s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); - if (s->contents == NULL && s->_raw_size != 0) + if (s->contents == NULL) return false; } - if (elf_hash_table (info)->dynamic_sections_created) + if (htab->elf.dynamic_sections_created) { /* Add some entries to the .dynamic section. We fill in the values later, in elf64_x86_64_finish_dynamic_sections, but we @@ -1073,7 +1434,7 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info) return false; } - if (plt) + if (htab->splt->_raw_size != 0) { if (!add_dynamic_entry (DT_PLTGOT, 0) || !add_dynamic_entry (DT_PLTRELSZ, 0) @@ -1088,12 +1449,18 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info) || !add_dynamic_entry (DT_RELASZ, 0) || !add_dynamic_entry (DT_RELAENT, sizeof (Elf64_External_Rela))) return false; - } - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - 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, readonly_dynrelocs, + (PTR) info); + + if ((info->flags & DF_TEXTREL) != 0) + { + if (!add_dynamic_entry (DT_TEXTREL, 0)) + return false; + } } } #undef add_dynamic_entry @@ -1101,37 +1468,6 @@ elf64_x86_64_size_dynamic_sections (output_bfd, info) return true; } -/* This function is called via elf64_x86_64_link_hash_traverse if we are - creating a shared object. In the -Bsymbolic case, it discards the - space allocated to copy PC relative relocs against symbols which - are defined in regular objects. For the normal non-symbolic case, - we also discard space for relocs that have become local due to - symbol visibility changes. We allocated space for them in the - check_relocs routine, but we won't fill them in in the - relocate_section routine. */ - -static boolean -elf64_x86_64_discard_copies (h, inf) - struct elf64_x86_64_link_hash_entry *h; - PTR inf; -{ - struct elf64_x86_64_pcrel_relocs_copied *s; - struct bfd_link_info *info = (struct bfd_link_info *) inf; - - /* If a symbol has been forced local or we have found a regular - definition for the symbolic link case, then we won't be needing - any relocs. */ - if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 - && ((h->root.elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0 - || info->symbolic)) - { - for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) - s->section->_raw_size -= s->count * sizeof (Elf64_External_Rela); - } - - return true; -} - /* Relocate an x86_64 ELF section. */ static boolean @@ -1146,31 +1482,21 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, Elf_Internal_Sym *local_syms; asection **local_sections; { - bfd *dynobj; + struct elf64_x86_64_link_hash_table *htab; Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; bfd_vma *local_got_offsets; - asection *sgot; - asection *splt; - asection *sreloc; - Elf_Internal_Rela *rela; + Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; - dynobj = elf_hash_table (info)->dynobj; + htab = elf64_x86_64_hash_table (info); symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); local_got_offsets = elf_local_got_offsets (input_bfd); - sreloc = splt = sgot = NULL; - if (dynobj != NULL) - { - splt = bfd_get_section_by_name (dynobj, ".plt"); - sgot = bfd_get_section_by_name (dynobj, ".got"); - } - - rela = relocs; + rel = relocs; relend = relocs + input_section->reloc_count; - for (; rela < relend; rela++) + for (; rel < relend; rel++) { int r_type; reloc_howto_type *howto; @@ -1178,23 +1504,24 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; asection *sec; + bfd_vma off; bfd_vma relocation; + boolean unresolved_reloc; bfd_reloc_status_type r; - unsigned int indx; - r_type = ELF64_R_TYPE (rela->r_info); + r_type = ELF64_R_TYPE (rel->r_info); if (r_type == (int) R_X86_64_GNU_VTINHERIT || r_type == (int) R_X86_64_GNU_VTENTRY) continue; - if ((indx = (unsigned) r_type) >= R_X86_64_max) + if (r_type < 0 || r_type >= R_X86_64_max) { bfd_set_error (bfd_error_bad_value); return false; } - howto = x86_64_elf_howto_table + indx; + howto = x86_64_elf_howto_table + r_type; - r_symndx = ELF64_R_SYM (rela->r_info); + r_symndx = ELF64_R_SYM (rel->r_info); if (info->relocateable) { @@ -1208,7 +1535,7 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) { sec = local_sections[r_symndx]; - rela->r_addend += sec->output_offset + sym->st_value; + rel->r_addend += sec->output_offset + sym->st_value; } } @@ -1219,11 +1546,13 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, h = NULL; sym = NULL; sec = NULL; + unresolved_reloc = false; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections[r_symndx]; - relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rela); + + relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); } else { @@ -1231,50 +1560,18 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, 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; + if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) { sec = h->root.u.def.section; - if ((r_type == R_X86_64_PLT32 - && splt != NULL - && h->plt.offset != (bfd_vma) -1) - || ((r_type == R_X86_64_GOT32 || r_type == R_X86_64_GOTPCREL) - && elf_hash_table (info)->dynamic_sections_created - && (!info->shared - || (! info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - || (info->shared - && ((! info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0) - && (r_type == R_X86_64_8 - || r_type == R_X86_64_16 - || r_type == R_X86_64_32 - || r_type == R_X86_64_64 - || r_type == R_X86_64_PC8 - || r_type == R_X86_64_PC16 - || r_type == R_X86_64_PC32) - && ((input_section->flags & SEC_ALLOC) != 0 - /* DWARF will emit R_X86_64_32 relocations in its - sections against symbols defined externally - in shared libraries. We can't do anything - with them here. */ - || ((input_section->flags & SEC_DEBUGGING) != 0 - && (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_DYNAMIC) != 0)))) - { - /* In these cases, we don't need the relocation - value. We check specially because in some - obscure cases sec->output_section will be NULL. */ - relocation = 0; - } - else if (sec->output_section == NULL) + if (sec->output_section == NULL) { - (*_bfd_error_handler) - (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), - bfd_archive_filename (input_bfd), h->root.root.string, - bfd_get_section_name (input_bfd, input_section)); + /* Set a flag that will be cleared later if we find a + relocation value for this symbol. output_section + is typically NULL for symbols satisfied by a shared + library. */ + unresolved_reloc = true; relocation = 0; } else @@ -1293,14 +1590,13 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, { if (! ((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, - input_section, rela->r_offset, + input_section, rel->r_offset, (!info->shared || info->no_undefined || ELF_ST_VISIBILITY (h->other))))) return false; relocation = 0; } } - /* When generating a shared object, the relocations handled here are copied into the output file to be resolved at run time. */ switch (r_type) @@ -1310,16 +1606,21 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, offset table. */ case R_X86_64_GOTPCREL: /* Use global offset table as symbol value. */ - BFD_ASSERT (sgot != NULL); + if (htab->sgot == NULL) + abort (); if (h != NULL) { - bfd_vma off = h->got.offset; - BFD_ASSERT (off != (bfd_vma) -1); + boolean dyn; + + off = h->got.offset; + dyn = htab->elf.dynamic_sections_created; - if (! elf_hash_table (info)->dynamic_sections_created + if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info, h) || (info->shared - && (info->symbolic || h->dynindx == -1) + && (info->symbolic + || h->dynindx == -1 + || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) { /* This is actually a static link, or it is a -Bsymbolic @@ -1338,21 +1639,17 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, else { bfd_put_64 (output_bfd, relocation, - sgot->contents + off); + htab->sgot->contents + off); h->got.offset |= 1; } } - if (r_type == R_X86_64_GOTPCREL) - relocation = sgot->output_section->vma + sgot->output_offset + off; else - relocation = sgot->output_offset + off; + unresolved_reloc = false; } else { - bfd_vma off; - - BFD_ASSERT (local_got_offsets != NULL - && local_got_offsets[r_symndx] != (bfd_vma) -1); + if (local_got_offsets == NULL) + abort (); off = local_got_offsets[r_symndx]; @@ -1363,39 +1660,42 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, off &= ~1; else { - bfd_put_64 (output_bfd, relocation, sgot->contents + off); + bfd_put_64 (output_bfd, relocation, + htab->sgot->contents + off); if (info->shared) { asection *srelgot; Elf_Internal_Rela outrel; + Elf64_External_Rela *loc; /* We need to generate a R_X86_64_RELATIVE reloc for the dynamic linker. */ - srelgot = bfd_get_section_by_name (dynobj, ".rela.got"); - BFD_ASSERT (srelgot != NULL); + srelgot = htab->srelgot; + if (srelgot == NULL) + abort (); - outrel.r_offset = (sgot->output_section->vma - + sgot->output_offset + outrel.r_offset = (htab->sgot->output_section->vma + + htab->sgot->output_offset + off); outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); outrel.r_addend = relocation; - bfd_elf64_swap_reloca_out (output_bfd, &outrel, - (((Elf64_External_Rela *) - srelgot->contents) - + srelgot->reloc_count)); - ++srelgot->reloc_count; + loc = (Elf64_External_Rela *) srelgot->contents; + loc += srelgot->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); } local_got_offsets[r_symndx] |= 1; } - - if (r_type == R_X86_64_GOTPCREL) - relocation = sgot->output_section->vma + sgot->output_offset + off; - else - relocation = sgot->output_offset + off; } + if (off >= (bfd_vma) -2) + abort (); + + relocation = htab->sgot->output_offset + off; + if (r_type == R_X86_64_GOTPCREL) + relocation += htab->sgot->output_section->vma; + break; case R_X86_64_PLT32: @@ -1407,7 +1707,8 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, if (h == NULL) break; - if (h->plt.offset == (bfd_vma) -1 || splt == NULL) + if (h->plt.offset == (bfd_vma) -1 + || htab->splt == NULL) { /* We didn't make a PLT entry for this symbol. This happens when statically linking PIC code, or when @@ -1415,62 +1716,64 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, break; } - relocation = (splt->output_section->vma - + splt->output_offset + relocation = (htab->splt->output_section->vma + + htab->splt->output_offset + h->plt.offset); + unresolved_reloc = false; break; case R_X86_64_PC8: case R_X86_64_PC16: case R_X86_64_PC32: - if (h == NULL || h->dynindx == -1 - || (info->symbolic - && h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) - break; - /* Fall through. */ case R_X86_64_8: case R_X86_64_16: case R_X86_64_32: case R_X86_64_64: /* FIXME: The ABI says the linker should make sure the value is the same when it's zeroextended to 64 bit. */ - if (info->shared - && r_symndx != 0 - && (input_section->flags & SEC_ALLOC) != 0) + + /* r_symndx will be zero only for relocs against symbols + from removed linkonce sections, or sections discarded by + a linker script. */ + if (r_symndx == 0 + || (input_section->flags & SEC_ALLOC) == 0) + break; + + if ((info->shared + && ((r_type != R_X86_64_PC8 + && r_type != R_X86_64_PC16 + && r_type != R_X86_64_PC32) + || (h != NULL + && h->dynindx != -1 + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + || (!info->shared + && h != NULL + && h->dynindx != -1 + && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0 + && (((h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_DYNAMIC) != 0 + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0) + || h->root.type == bfd_link_hash_undefweak + || h->root.type == bfd_link_hash_undefined))) { Elf_Internal_Rela outrel; boolean skip, relocate; + asection *sreloc; + Elf64_External_Rela *loc; /* When generating a shared object, these relocations are copied into the output file to be resolved at run time. */ - if (sreloc == NULL) - { - const char *name; - - name = (bfd_elf_string_from_elf_section - (input_bfd, - elf_elfheader (input_bfd)->e_shstrndx, - elf_section_data (input_section)->rel_hdr.sh_name)); - if (name == NULL) - return false; - - BFD_ASSERT (strncmp (name, ".rela", 5) == 0 - && strcmp (bfd_get_section_name (input_bfd, - input_section), - name + 5) == 0); - - sreloc = bfd_get_section_by_name (dynobj, name); - BFD_ASSERT (sreloc != NULL); - } - skip = false; relocate = false; outrel.r_offset = _bfd_elf_section_offset (output_bfd, info, input_section, - rela->r_offset); + rel->r_offset); if (outrel.r_offset == (bfd_vma) -1) skip = true; else if (outrel.r_offset == (bfd_vma) -1) @@ -1481,65 +1784,37 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, 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->dynindx != -1 + && (r_type == R_X86_64_PC8 + || r_type == R_X86_64_PC16 + || r_type == R_X86_64_PC32 + || !info->shared + || !info->symbolic || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)) { - BFD_ASSERT (h->dynindx != -1); outrel.r_info = ELF64_R_INFO (h->dynindx, r_type); - outrel.r_addend = relocation + rela->r_addend; + outrel.r_addend = rel->r_addend; } else { - if (r_type == R_X86_64_64) - { - relocate = true; - outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); - outrel.r_addend = relocation + rela->r_addend; - } - else - { - long sindx; - - if (h == NULL) - sec = local_sections[r_symndx]; - else - { - BFD_ASSERT (h->root.type == bfd_link_hash_defined - || (h->root.type - == bfd_link_hash_defweak)); - sec = h->root.u.def.section; - } - if (sec != NULL && bfd_is_abs_section (sec)) - sindx = 0; - else if (sec == NULL || sec->owner == NULL) - { - bfd_set_error (bfd_error_bad_value); - return false; - } - else - { - asection *osec; - - osec = sec->output_section; - sindx = elf_section_data (osec)->dynindx; - BFD_ASSERT (sindx > 0); - } - - outrel.r_info = ELF64_R_INFO (sindx, r_type); - outrel.r_addend = relocation + rela->r_addend; - } - + /* This symbol is local, or marked to become local. */ + relocate = true; + outrel.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); + outrel.r_addend = relocation + rel->r_addend; } - bfd_elf64_swap_reloca_out (output_bfd, &outrel, - (((Elf64_External_Rela *) - sreloc->contents) - + sreloc->reloc_count)); - ++sreloc->reloc_count; + sreloc = elf_section_data (input_section)->sreloc; + if (sreloc == NULL) + abort (); + + loc = (Elf64_External_Rela *) sreloc->contents; + loc += sreloc->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &outrel, loc); /* If this reloc is against an external symbol, we do not want to fiddle with the addend. Otherwise, we @@ -1555,39 +1830,59 @@ elf64_x86_64_relocate_section (output_bfd, info, input_bfd, input_section, break; } + /* FIXME: Why do we allow debugging sections to escape this error? + More importantly, why do we not emit dynamic relocs for + R_386_32 above in debugging sections (which are ! SEC_ALLOC)? + If we had emitted the dynamic reloc, we could remove the + fudge here. */ + if (unresolved_reloc + && !(info->shared + && (input_section->flags & SEC_DEBUGGING) != 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)) + (*_bfd_error_handler) + (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, + h->root.root.string); + r = _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rela->r_offset, - relocation, rela->r_addend); + contents, rel->r_offset, + relocation, rel->r_addend); if (r != bfd_reloc_ok) { - switch (r) + const char *name; + + if (h != NULL) + name = h->root.root.string; + else { - default: - case bfd_reloc_outofrange: - abort (); - case bfd_reloc_overflow: - { - const char *name; - - if (h != NULL) - name = h->root.root.string; - else - { - name = bfd_elf_string_from_elf_section (input_bfd, - symtab_hdr->sh_link, - sym->st_name); - if (name == NULL) - return false; - if (*name == '\0') - name = bfd_section_name (input_bfd, sec); - } - if (! ((*info->callbacks->reloc_overflow) - (info, name, howto->name, (bfd_vma) 0, - input_bfd, input_section, rela->r_offset))) - return false; - } - break; + name = bfd_elf_string_from_elf_section (input_bfd, + symtab_hdr->sh_link, + sym->st_name); + if (name == NULL) + return false; + if (*name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + if (r == bfd_reloc_overflow) + { + + if (! ((*info->callbacks->reloc_overflow) + (info, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return false; + } + else + { + (*_bfd_error_handler) + (_("%s(%s+0x%lx): reloc against `%s': error %d"), + bfd_archive_filename (input_bfd), + bfd_get_section_name (input_bfd, input_section), + (long) rel->r_offset, name, (int) r); + return false; } } } @@ -1605,28 +1900,25 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; { - bfd *dynobj; + struct elf64_x86_64_link_hash_table *htab; - dynobj = elf_hash_table (info)->dynobj; + htab = elf64_x86_64_hash_table (info); if (h->plt.offset != (bfd_vma) -1) { - asection *splt; - asection *sgot; - asection *srela; bfd_vma plt_index; bfd_vma got_offset; Elf_Internal_Rela rela; + Elf64_External_Rela *loc; /* This symbol has an entry in the procedure linkage table. Set it up. */ - BFD_ASSERT (h->dynindx != -1); - - splt = bfd_get_section_by_name (dynobj, ".plt"); - sgot = bfd_get_section_by_name (dynobj, ".got.plt"); - srela = bfd_get_section_by_name (dynobj, ".rela.plt"); - BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL); + if (h->dynindx == -1 + || htab->splt == NULL + || htab->sgotplt == NULL + || htab->srelplt == NULL) + abort (); /* Get the index in the procedure linkage table which corresponds to this symbol. This is the index of this symbol @@ -1640,7 +1932,7 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) got_offset = (plt_index + 3) * GOT_ENTRY_SIZE; /* Fill in the entry in the procedure linkage table. */ - memcpy (splt->contents + h->plt.offset, elf64_x86_64_plt_entry, + memcpy (htab->splt->contents + h->plt.offset, elf64_x86_64_plt_entry, PLT_ENTRY_SIZE); /* Insert the relocation positions of the plt section. The magic @@ -1649,67 +1941,61 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) /* Put offset for jmp *name@GOTPCREL(%rip), since the instruction uses 6 bytes, subtract this value. */ bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset + (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + got_offset - - splt->output_section->vma - - splt->output_offset + - htab->splt->output_section->vma + - htab->splt->output_offset - h->plt.offset - 6), - splt->contents + h->plt.offset + 2); + htab->splt->contents + h->plt.offset + 2); /* Put relocation index. */ bfd_put_32 (output_bfd, plt_index, - splt->contents + h->plt.offset + 7); + htab->splt->contents + h->plt.offset + 7); /* Put offset for jmp .PLT0. */ bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE), - splt->contents + h->plt.offset + 12); + htab->splt->contents + h->plt.offset + 12); /* Fill in the entry in the global offset table, initially this points to the pushq instruction in the PLT which is at offset 6. */ - bfd_put_64 (output_bfd, (splt->output_section->vma + splt->output_offset + bfd_put_64 (output_bfd, (htab->splt->output_section->vma + + htab->splt->output_offset + h->plt.offset + 6), - sgot->contents + got_offset); + htab->sgotplt->contents + got_offset); /* Fill in the entry in the .rela.plt section. */ - rela.r_offset = (sgot->output_section->vma - + sgot->output_offset + rela.r_offset = (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + got_offset); rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_JUMP_SLOT); rela.r_addend = 0; - bfd_elf64_swap_reloca_out (output_bfd, &rela, - ((Elf64_External_Rela *) srela->contents - + plt_index)); + loc = (Elf64_External_Rela *) htab->srelplt->contents + plt_index; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) { /* Mark the symbol as undefined, rather than as defined in - the .plt section. Leave the value alone. */ + the .plt section. Leave the value alone. This is a clue + for the dynamic linker, to make function pointer + comparisons work between an application and shared + library. */ sym->st_shndx = SHN_UNDEF; - /* If the symbol is weak, we do need to clear the value. - Otherwise, the PLT entry would provide a definition for - the symbol even if the symbol wasn't defined anywhere, - and so the symbol would never be NULL. */ - if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) - == 0) - sym->st_value = 0; } } if (h->got.offset != (bfd_vma) -1) { - asection *sgot; - asection *srela; Elf_Internal_Rela rela; + Elf64_External_Rela *loc; /* 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 (htab->sgot == NULL || htab->srelgot == NULL) + abort (); - rela.r_offset = (sgot->output_section->vma - + sgot->output_offset + rela.r_offset = (htab->sgot->output_section->vma + + htab->sgot->output_offset + (h->got.offset &~ (bfd_vma) 1)); /* If this is a static link, or it is a -Bsymbolic link and the @@ -1717,10 +2003,11 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) of a version file, we just want to emit a RELATIVE reloc. The entry in the global offset table will already have been initialized in the relocate_section function. */ - if (! elf_hash_table (info)->dynamic_sections_created - || (info->shared - && (info->symbolic || h->dynindx == -1) - && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) + if (info->shared + && (info->symbolic + || h->dynindx == -1 + || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL)) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) { BFD_ASSERT((h->got.offset & 1) != 0); rela.r_info = ELF64_R_INFO (0, R_X86_64_RELATIVE); @@ -1731,41 +2018,38 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) else { BFD_ASSERT((h->got.offset & 1) == 0); - bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); + bfd_put_64 (output_bfd, (bfd_vma) 0, + htab->sgot->contents + h->got.offset); rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_GLOB_DAT); rela.r_addend = 0; } - bfd_elf64_swap_reloca_out (output_bfd, &rela, - ((Elf64_External_Rela *) srela->contents - + srela->reloc_count)); - ++srela->reloc_count; + loc = (Elf64_External_Rela *) htab->srelgot->contents; + loc += htab->srelgot->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); } if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) { - asection *s; Elf_Internal_Rela rela; + Elf64_External_Rela *loc; /* This symbol needs a copy reloc. Set it up. */ - BFD_ASSERT (h->dynindx != -1 - && (h->root.type == bfd_link_hash_defined - || h->root.type == bfd_link_hash_defweak)); - - s = bfd_get_section_by_name (h->root.u.def.section->owner, - ".rela.bss"); - BFD_ASSERT (s != NULL); + if (h->dynindx == -1 + || (h->root.type != bfd_link_hash_defined + && h->root.type != bfd_link_hash_defweak) + || htab->srelbss == NULL) + abort (); rela.r_offset = (h->root.u.def.value + h->root.u.def.section->output_section->vma + h->root.u.def.section->output_offset); rela.r_info = ELF64_R_INFO (h->dynindx, R_X86_64_COPY); rela.r_addend = 0; - bfd_elf64_swap_reloca_out (output_bfd, &rela, - ((Elf64_External_Rela *) s->contents - + s->reloc_count)); - ++s->reloc_count; + loc = (Elf64_External_Rela *) htab->srelbss->contents; + loc += htab->srelbss->reloc_count++; + bfd_elf64_swap_reloca_out (output_bfd, &rela, loc); } /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ @@ -1776,6 +2060,26 @@ elf64_x86_64_finish_dynamic_symbol (output_bfd, info, h, sym) return true; } +/* Used to decide how to sort relocs in an optimal manner for the + dynamic linker, before writing them out. */ + +static enum elf_reloc_type_class +elf64_x86_64_reloc_type_class (rela) + const Elf_Internal_Rela *rela; +{ + switch ((int) ELF64_R_TYPE (rela->r_info)) + { + case R_X86_64_RELATIVE: + return reloc_class_relative; + case R_X86_64_JUMP_SLOT: + return reloc_class_plt; + case R_X86_64_COPY: + return reloc_class_copy; + default: + return reloc_class_normal; + } +} + /* Finish up the dynamic sections. */ static boolean @@ -1783,29 +2087,26 @@ elf64_x86_64_finish_dynamic_sections (output_bfd, info) bfd *output_bfd; struct bfd_link_info *info; { + struct elf64_x86_64_link_hash_table *htab; bfd *dynobj; asection *sdyn; - asection *sgot; - dynobj = elf_hash_table (info)->dynobj; - - sgot = bfd_get_section_by_name (dynobj, ".got.plt"); - BFD_ASSERT (sgot != NULL); + htab = elf64_x86_64_hash_table (info); + dynobj = htab->elf.dynobj; sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); - if (elf_hash_table (info)->dynamic_sections_created) + if (htab->elf.dynamic_sections_created) { - asection *splt; Elf64_External_Dyn *dyncon, *dynconend; - BFD_ASSERT (sdyn != NULL); + if (sdyn == NULL || htab->sgot == NULL) + abort (); dyncon = (Elf64_External_Dyn *) sdyn->contents; dynconend = (Elf64_External_Dyn *) (sdyn->contents + sdyn->_raw_size); for (; dyncon < dynconend; dyncon++) { Elf_Internal_Dyn dyn; - const char *name; asection *s; bfd_elf64_swap_dyn_in (dynobj, dyncon, &dyn); @@ -1816,115 +2117,100 @@ elf64_x86_64_finish_dynamic_sections (output_bfd, info) continue; case DT_PLTGOT: - name = ".got"; - goto get_vma; + dyn.d_un.d_ptr = htab->sgot->output_section->vma; + break; case DT_JMPREL: - name = ".rela.plt"; + dyn.d_un.d_ptr = htab->srelplt->output_section->vma; + break; - get_vma: - s = bfd_get_section_by_name (output_bfd, name); - BFD_ASSERT (s != NULL); - dyn.d_un.d_ptr = s->vma; + case DT_PLTRELSZ: + s = htab->srelplt->output_section; + if (s->_cooked_size != 0) + dyn.d_un.d_val = s->_cooked_size; + else + dyn.d_un.d_val = s->_raw_size; break; case DT_RELASZ: - /* FIXME: This comment and code is from elf64-alpha.c: */ - /* My interpretation of the TIS v1.1 ELF document indicates - that RELASZ should not include JMPREL. This is not what - the rest of the BFD does. It is, however, what the - glibc ld.so wants. Do this fixup here until we found - out who is right. */ - s = bfd_get_section_by_name (output_bfd, ".rela.plt"); - if (s) + /* The procedure linkage table relocs (DT_JMPREL) should + not be included in the overall relocs (DT_RELA). + Therefore, we override the DT_RELASZ entry here to + make it not include the JMPREL relocs. Since the + linker script arranges for .rela.plt to follow all + other relocation sections, we don't have to worry + about changing the DT_RELA entry. */ + if (htab->srelplt != NULL) { - /* Subtract JMPREL size from RELASZ. */ - dyn.d_un.d_val -= - (s->_cooked_size ? s->_cooked_size : s->_raw_size); + s = htab->srelplt->output_section; + if (s->_cooked_size != 0) + dyn.d_un.d_val -= s->_cooked_size; + else + dyn.d_un.d_val -= s->_raw_size; } break; - - case DT_PLTRELSZ: - s = bfd_get_section_by_name (output_bfd, ".rela.plt"); - BFD_ASSERT (s != NULL); - dyn.d_un.d_val = - (s->_cooked_size != 0 ? s->_cooked_size : s->_raw_size); - break; } + bfd_elf64_swap_dyn_out (output_bfd, &dyn, dyncon); } - /* Initialize the contents of the .plt section. */ - splt = bfd_get_section_by_name (dynobj, ".plt"); - BFD_ASSERT (splt != NULL); - if (splt->_raw_size > 0) + /* Fill in the special first entry in the procedure linkage table. */ + if (htab->splt && htab->splt->_raw_size > 0) { /* Fill in the first entry in the procedure linkage table. */ - memcpy (splt->contents, elf64_x86_64_plt0_entry, PLT_ENTRY_SIZE); + memcpy (htab->splt->contents, elf64_x86_64_plt0_entry, + PLT_ENTRY_SIZE); /* Add offset for pushq GOT+8(%rip), since the instruction uses 6 bytes subtract this value. */ bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset + (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + 8 - - splt->output_section->vma - - splt->output_offset + - htab->splt->output_section->vma + - htab->splt->output_offset - 6), - splt->contents + 2); + htab->splt->contents + 2); /* Add offset for jmp *GOT+16(%rip). The 12 is the offset to the end of the instruction. */ bfd_put_32 (output_bfd, - (sgot->output_section->vma - + sgot->output_offset + (htab->sgotplt->output_section->vma + + htab->sgotplt->output_offset + 16 - - splt->output_section->vma - - splt->output_offset + - htab->splt->output_section->vma + - htab->splt->output_offset - 12), - splt->contents + 8); + htab->splt->contents + 8); + elf_section_data (htab->splt->output_section)->this_hdr.sh_entsize = + PLT_ENTRY_SIZE; } - - elf_section_data (splt->output_section)->this_hdr.sh_entsize = - PLT_ENTRY_SIZE; } - /* Set the first entry in the global offset table to the address of - the dynamic section. */ - if (sgot->_raw_size > 0) + if (htab->sgotplt) { - if (sdyn == NULL) - bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents); - else - bfd_put_64 (output_bfd, - sdyn->output_section->vma + sdyn->output_offset, - sgot->contents); - /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ - bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE); - bfd_put_64 (output_bfd, (bfd_vma) 0, sgot->contents + GOT_ENTRY_SIZE*2); - } + /* Fill in the first three entries in the global offset table. */ + if (htab->sgotplt->_raw_size > 0) + { + /* Set the first entry in the global offset table to the address of + the dynamic section. */ + if (sdyn == NULL) + bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents); + else + bfd_put_64 (output_bfd, + sdyn->output_section->vma + sdyn->output_offset, + htab->sgotplt->contents); + /* Write GOT[1] and GOT[2], needed for the dynamic linker. */ + bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE); + bfd_put_64 (output_bfd, (bfd_vma) 0, htab->sgotplt->contents + GOT_ENTRY_SIZE*2); + } - elf_section_data (sgot->output_section)->this_hdr.sh_entsize = - GOT_ENTRY_SIZE; + elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = + GOT_ENTRY_SIZE; + } return true; } -static enum elf_reloc_type_class -elf64_x86_64_reloc_type_class (rela) - const Elf_Internal_Rela *rela; -{ - switch ((int) ELF64_R_TYPE (rela->r_info)) - { - case R_X86_64_RELATIVE: - return reloc_class_relative; - case R_X86_64_JUMP_SLOT: - return reloc_class_plt; - case R_X86_64_COPY: - return reloc_class_copy; - default: - return reloc_class_normal; - } -} #define TARGET_LITTLE_SYM bfd_elf64_x86_64_vec #define TARGET_LITTLE_NAME "elf64-x86-64" @@ -1942,22 +2228,21 @@ elf64_x86_64_reloc_type_class (rela) #define elf_info_to_howto elf64_x86_64_info_to_howto -#define bfd_elf64_bfd_final_link _bfd_elf64_gc_common_final_link #define bfd_elf64_bfd_link_hash_table_create \ elf64_x86_64_link_hash_table_create #define bfd_elf64_bfd_reloc_type_lookup elf64_x86_64_reloc_type_lookup #define elf_backend_adjust_dynamic_symbol elf64_x86_64_adjust_dynamic_symbol #define elf_backend_check_relocs elf64_x86_64_check_relocs -#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections -#define elf_backend_finish_dynamic_sections \ - elf64_x86_64_finish_dynamic_sections +#define elf_backend_copy_indirect_symbol elf64_x86_64_copy_indirect_symbol +#define elf_backend_create_dynamic_sections elf64_x86_64_create_dynamic_sections +#define elf_backend_finish_dynamic_sections elf64_x86_64_finish_dynamic_sections #define elf_backend_finish_dynamic_symbol elf64_x86_64_finish_dynamic_symbol #define elf_backend_gc_mark_hook elf64_x86_64_gc_mark_hook #define elf_backend_gc_sweep_hook elf64_x86_64_gc_sweep_hook +#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class #define elf_backend_relocate_section elf64_x86_64_relocate_section #define elf_backend_size_dynamic_sections elf64_x86_64_size_dynamic_sections #define elf_backend_object_p elf64_x86_64_elf_object_p -#define elf_backend_reloc_type_class elf64_x86_64_reloc_type_class #include "elf64-target.h" |