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Diffstat (limited to 'x/binutils/bfd/elf32-arm.h')
| -rw-r--r-- | x/binutils/bfd/elf32-arm.h | 4108 |
1 files changed, 0 insertions, 4108 deletions
diff --git a/x/binutils/bfd/elf32-arm.h b/x/binutils/bfd/elf32-arm.h deleted file mode 100644 index 8c1acc0625cb..000000000000 --- a/x/binutils/bfd/elf32-arm.h +++ /dev/null @@ -1,4108 +0,0 @@ -/* 32-bit ELF support for ARM - Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004 - Free Software Foundation, Inc. - - This file is part of BFD, the Binary File Descriptor library. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ifndef USE_REL -#define USE_REL 0 -#endif - -typedef unsigned long int insn32; -typedef unsigned short int insn16; - -static bfd_boolean elf32_arm_set_private_flags - PARAMS ((bfd *, flagword)); -static bfd_boolean elf32_arm_copy_private_bfd_data - PARAMS ((bfd *, bfd *)); -static bfd_boolean elf32_arm_merge_private_bfd_data - PARAMS ((bfd *, bfd *)); -static bfd_boolean elf32_arm_print_private_bfd_data - PARAMS ((bfd *, PTR)); -static int elf32_arm_get_symbol_type - PARAMS (( Elf_Internal_Sym *, int)); -static struct bfd_link_hash_table *elf32_arm_link_hash_table_create - PARAMS ((bfd *)); -static bfd_reloc_status_type elf32_arm_final_link_relocate - PARAMS ((reloc_howto_type *, bfd *, bfd *, asection *, bfd_byte *, - Elf_Internal_Rela *, bfd_vma, struct bfd_link_info *, asection *, - const char *, int, struct elf_link_hash_entry *)); -static insn32 insert_thumb_branch - PARAMS ((insn32, int)); -static struct elf_link_hash_entry *find_thumb_glue - PARAMS ((struct bfd_link_info *, const char *, bfd *)); -static struct elf_link_hash_entry *find_arm_glue - PARAMS ((struct bfd_link_info *, const char *, bfd *)); -static void elf32_arm_post_process_headers - PARAMS ((bfd *, struct bfd_link_info *)); -static int elf32_arm_to_thumb_stub - PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, - bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); -static int elf32_thumb_to_arm_stub - PARAMS ((struct bfd_link_info *, const char *, bfd *, bfd *, asection *, - bfd_byte *, asection *, bfd_vma, bfd_signed_vma, bfd_vma)); -static bfd_boolean elf32_arm_relocate_section - PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, - Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); -static asection * elf32_arm_gc_mark_hook - PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, - struct elf_link_hash_entry *, Elf_Internal_Sym *)); -static bfd_boolean elf32_arm_gc_sweep_hook - PARAMS ((bfd *, struct bfd_link_info *, asection *, - const Elf_Internal_Rela *)); -static bfd_boolean elf32_arm_check_relocs - PARAMS ((bfd *, struct bfd_link_info *, asection *, - const Elf_Internal_Rela *)); -static bfd_boolean elf32_arm_find_nearest_line - PARAMS ((bfd *, asection *, asymbol **, bfd_vma, const char **, - const char **, unsigned int *)); -static bfd_boolean elf32_arm_adjust_dynamic_symbol - PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); -static bfd_boolean elf32_arm_size_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); -static bfd_boolean elf32_arm_finish_dynamic_symbol - PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *, - Elf_Internal_Sym *)); -static bfd_boolean elf32_arm_finish_dynamic_sections - PARAMS ((bfd *, struct bfd_link_info *)); -static struct bfd_hash_entry * elf32_arm_link_hash_newfunc - PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *)); -#if USE_REL -static void arm_add_to_rel - PARAMS ((bfd *, bfd_byte *, reloc_howto_type *, bfd_signed_vma)); -#endif -static bfd_boolean allocate_dynrelocs - PARAMS ((struct elf_link_hash_entry *h, PTR inf)); -static bfd_boolean create_got_section - PARAMS ((bfd * dynobj, struct bfd_link_info * info)); -static bfd_boolean elf32_arm_create_dynamic_sections - PARAMS ((bfd * dynobj, struct bfd_link_info * info)); -static enum elf_reloc_type_class elf32_arm_reloc_type_class - PARAMS ((const Elf_Internal_Rela *)); -static bfd_boolean elf32_arm_object_p - PARAMS ((bfd *)); - -#ifndef ELFARM_NABI_C_INCLUDED -static void record_arm_to_thumb_glue - PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); -static void record_thumb_to_arm_glue - PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *)); -bfd_boolean bfd_elf32_arm_allocate_interworking_sections - PARAMS ((struct bfd_link_info *)); -bfd_boolean bfd_elf32_arm_get_bfd_for_interworking - PARAMS ((bfd *, struct bfd_link_info *)); -bfd_boolean bfd_elf32_arm_process_before_allocation - PARAMS ((bfd *, struct bfd_link_info *, int)); -#endif - - -#define INTERWORK_FLAG(abfd) (elf_elfheader (abfd)->e_flags & EF_ARM_INTERWORK) - -/* The linker script knows the section names for placement. - The entry_names are used to do simple name mangling on the stubs. - Given a function name, and its type, the stub can be found. The - name can be changed. The only requirement is the %s be present. */ -#define THUMB2ARM_GLUE_SECTION_NAME ".glue_7t" -#define THUMB2ARM_GLUE_ENTRY_NAME "__%s_from_thumb" - -#define ARM2THUMB_GLUE_SECTION_NAME ".glue_7" -#define ARM2THUMB_GLUE_ENTRY_NAME "__%s_from_arm" - -/* The name of the dynamic interpreter. This is put in the .interp - section. */ -#define ELF_DYNAMIC_INTERPRETER "/usr/lib/ld.so.1" - -#ifdef FOUR_WORD_PLT - -/* The size in bytes of the special first entry in the procedure - linkage table. */ -#define PLT_HEADER_SIZE 16 - -/* The size in bytes of an entry in the procedure linkage table. */ -#define PLT_ENTRY_SIZE 16 - -/* The first entry in a procedure linkage table looks like - this. It is set up so that any shared library function that is - called before the relocation has been set up calls the dynamic - linker first. */ -static const bfd_vma elf32_arm_plt0_entry [PLT_HEADER_SIZE / 4] = - { - 0xe52de004, /* str lr, [sp, #-4]! */ - 0xe59fe010, /* ldr lr, [pc, #16] */ - 0xe08fe00e, /* add lr, pc, lr */ - 0xe5bef008, /* ldr pc, [lr, #8]! */ - }; - -/* Subsequent entries in a procedure linkage table look like - this. */ -static const bfd_vma elf32_arm_plt_entry [PLT_ENTRY_SIZE / 4] = - { - 0xe28fc600, /* add ip, pc, #NN */ - 0xe28cca00, /* add ip, ip, #NN */ - 0xe5bcf000, /* ldr pc, [ip, #NN]! */ - 0x00000000, /* unused */ - }; - -#else - -/* The size in bytes of the special first entry in the procedure - linkage table. */ -#define PLT_HEADER_SIZE 20 - -/* The size in bytes of an entry in the procedure linkage table. */ -#define PLT_ENTRY_SIZE 12 - -/* The first entry in a procedure linkage table looks like - this. It is set up so that any shared library function that is - called before the relocation has been set up calls the dynamic - linker first. */ -static const bfd_vma elf32_arm_plt0_entry [PLT_HEADER_SIZE / 4] = - { - 0xe52de004, /* str lr, [sp, #-4]! */ - 0xe59fe004, /* ldr lr, [pc, #4] */ - 0xe08fe00e, /* add lr, pc, lr */ - 0xe5bef008, /* ldr pc, [lr, #8]! */ - 0x00000000, /* &GOT[0] - . */ - }; - -/* Subsequent entries in a procedure linkage table look like - this. */ -static const bfd_vma elf32_arm_plt_entry [PLT_ENTRY_SIZE / 4] = - { - 0xe28fc600, /* add ip, pc, #0xNN00000 */ - 0xe28cca00, /* add ip, ip, #0xNN000 */ - 0xe5bcf000, /* ldr pc, [ip, #0xNNN]! */ - }; - -#endif - -/* The ARM 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. */ - -/* This structure keeps track of the number of PC relative relocs we - have copied for a given symbol. */ -struct elf32_arm_relocs_copied - { - /* Next section. */ - struct elf32_arm_relocs_copied * next; - /* A section in dynobj. */ - asection * section; - /* Number of relocs copied in this section. */ - bfd_size_type count; - }; - -/* Arm ELF linker hash entry. */ -struct elf32_arm_link_hash_entry - { - struct elf_link_hash_entry root; - - /* Number of PC relative relocs copied for this symbol. */ - struct elf32_arm_relocs_copied * relocs_copied; - }; - -/* Traverse an arm ELF linker hash table. */ -#define elf32_arm_link_hash_traverse(table, func, info) \ - (elf_link_hash_traverse \ - (&(table)->root, \ - (bfd_boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func), \ - (info))) - -/* Get the ARM elf linker hash table from a link_info structure. */ -#define elf32_arm_hash_table(info) \ - ((struct elf32_arm_link_hash_table *) ((info)->hash)) - -/* ARM ELF linker hash table. */ -struct elf32_arm_link_hash_table - { - /* The main hash table. */ - struct elf_link_hash_table root; - - /* The size in bytes of the section containing the Thumb-to-ARM glue. */ - bfd_size_type thumb_glue_size; - - /* The size in bytes of the section containing the ARM-to-Thumb glue. */ - bfd_size_type arm_glue_size; - - /* An arbitrary input BFD chosen to hold the glue sections. */ - bfd * bfd_of_glue_owner; - - /* A boolean indicating whether knowledge of the ARM's pipeline - length should be applied by the linker. */ - int no_pipeline_knowledge; - - /* Short-cuts to get to dynamic linker sections. */ - asection *sgot; - asection *sgotplt; - asection *srelgot; - asection *splt; - asection *srelplt; - asection *sdynbss; - asection *srelbss; - - /* Small local sym to section mapping cache. */ - struct sym_sec_cache sym_sec; - }; - -/* Create an entry in an ARM ELF linker hash table. */ - -static struct bfd_hash_entry * -elf32_arm_link_hash_newfunc (entry, table, string) - struct bfd_hash_entry * entry; - struct bfd_hash_table * table; - const char * string; -{ - struct elf32_arm_link_hash_entry * ret = - (struct elf32_arm_link_hash_entry *) entry; - - /* Allocate the structure if it has not already been allocated by a - subclass. */ - if (ret == (struct elf32_arm_link_hash_entry *) NULL) - ret = ((struct elf32_arm_link_hash_entry *) - bfd_hash_allocate (table, - sizeof (struct elf32_arm_link_hash_entry))); - if (ret == (struct elf32_arm_link_hash_entry *) NULL) - return (struct bfd_hash_entry *) ret; - - /* Call the allocation method of the superclass. */ - ret = ((struct elf32_arm_link_hash_entry *) - _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret, - table, string)); - if (ret != (struct elf32_arm_link_hash_entry *) NULL) - ret->relocs_copied = NULL; - - return (struct bfd_hash_entry *) ret; -} - -/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up - shortcuts to them in our hash table. */ - -static bfd_boolean -create_got_section (dynobj, info) - bfd *dynobj; - struct bfd_link_info *info; -{ - struct elf32_arm_link_hash_table *htab; - - if (! _bfd_elf_create_got_section (dynobj, info)) - return FALSE; - - htab = elf32_arm_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, ".rel.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, 2)) - return FALSE; - return TRUE; -} - -/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and - .rel.bss sections in DYNOBJ, and set up shortcuts to them in our - hash table. */ - -static bfd_boolean -elf32_arm_create_dynamic_sections (dynobj, info) - bfd *dynobj; - struct bfd_link_info *info; -{ - struct elf32_arm_link_hash_table *htab; - - htab = elf32_arm_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, ".rel.plt"); - htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss"); - if (!info->shared) - htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.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 -elf32_arm_copy_indirect_symbol (const struct elf_backend_data *bed, - struct elf_link_hash_entry *dir, - struct elf_link_hash_entry *ind) -{ - struct elf32_arm_link_hash_entry *edir, *eind; - - edir = (struct elf32_arm_link_hash_entry *) dir; - eind = (struct elf32_arm_link_hash_entry *) ind; - - if (eind->relocs_copied != NULL) - { - if (edir->relocs_copied != NULL) - { - struct elf32_arm_relocs_copied **pp; - struct elf32_arm_relocs_copied *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->relocs_copied; (p = *pp) != NULL; ) - { - struct elf32_arm_relocs_copied *q; - - for (q = edir->relocs_copied; q != NULL; q = q->next) - if (q->section == p->section) - { - q->count += p->count; - *pp = p->next; - break; - } - if (q == NULL) - pp = &p->next; - } - *pp = edir->relocs_copied; - } - - edir->relocs_copied = eind->relocs_copied; - eind->relocs_copied = NULL; - } - - _bfd_elf_link_hash_copy_indirect (bed, dir, ind); -} - -/* Create an ARM elf linker hash table. */ - -static struct bfd_link_hash_table * -elf32_arm_link_hash_table_create (abfd) - bfd *abfd; -{ - struct elf32_arm_link_hash_table *ret; - bfd_size_type amt = sizeof (struct elf32_arm_link_hash_table); - - ret = (struct elf32_arm_link_hash_table *) bfd_malloc (amt); - if (ret == (struct elf32_arm_link_hash_table *) NULL) - return NULL; - - if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, - elf32_arm_link_hash_newfunc)) - { - free (ret); - return NULL; - } - - ret->sgot = NULL; - ret->sgotplt = NULL; - ret->srelgot = NULL; - ret->splt = NULL; - ret->srelplt = NULL; - ret->sdynbss = NULL; - ret->srelbss = NULL; - ret->thumb_glue_size = 0; - ret->arm_glue_size = 0; - ret->bfd_of_glue_owner = NULL; - ret->no_pipeline_knowledge = 0; - ret->sym_sec.abfd = NULL; - - return &ret->root.root; -} - -/* Locate the Thumb encoded calling stub for NAME. */ - -static struct elf_link_hash_entry * -find_thumb_glue (link_info, name, input_bfd) - struct bfd_link_info *link_info; - const char *name; - bfd *input_bfd; -{ - char *tmp_name; - struct elf_link_hash_entry *hash; - struct elf32_arm_link_hash_table *hash_table; - - /* We need a pointer to the armelf specific hash table. */ - hash_table = elf32_arm_hash_table (link_info); - - tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) - + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); - - BFD_ASSERT (tmp_name); - - sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); - - hash = elf_link_hash_lookup - (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); - - if (hash == NULL) - /* xgettext:c-format */ - (*_bfd_error_handler) (_("%s: unable to find THUMB glue '%s' for `%s'"), - bfd_archive_filename (input_bfd), tmp_name, name); - - free (tmp_name); - - return hash; -} - -/* Locate the ARM encoded calling stub for NAME. */ - -static struct elf_link_hash_entry * -find_arm_glue (link_info, name, input_bfd) - struct bfd_link_info *link_info; - const char *name; - bfd *input_bfd; -{ - char *tmp_name; - struct elf_link_hash_entry *myh; - struct elf32_arm_link_hash_table *hash_table; - - /* We need a pointer to the elfarm specific hash table. */ - hash_table = elf32_arm_hash_table (link_info); - - tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) - + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); - - BFD_ASSERT (tmp_name); - - sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); - - myh = elf_link_hash_lookup - (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); - - if (myh == NULL) - /* xgettext:c-format */ - (*_bfd_error_handler) (_("%s: unable to find ARM glue '%s' for `%s'"), - bfd_archive_filename (input_bfd), tmp_name, name); - - free (tmp_name); - - return myh; -} - -/* ARM->Thumb glue: - - .arm - __func_from_arm: - ldr r12, __func_addr - bx r12 - __func_addr: - .word func @ behave as if you saw a ARM_32 reloc. */ - -#define ARM2THUMB_GLUE_SIZE 12 -static const insn32 a2t1_ldr_insn = 0xe59fc000; -static const insn32 a2t2_bx_r12_insn = 0xe12fff1c; -static const insn32 a2t3_func_addr_insn = 0x00000001; - -/* Thumb->ARM: Thumb->(non-interworking aware) ARM - - .thumb .thumb - .align 2 .align 2 - __func_from_thumb: __func_from_thumb: - bx pc push {r6, lr} - nop ldr r6, __func_addr - .arm mov lr, pc - __func_change_to_arm: bx r6 - b func .arm - __func_back_to_thumb: - ldmia r13! {r6, lr} - bx lr - __func_addr: - .word func */ - -#define THUMB2ARM_GLUE_SIZE 8 -static const insn16 t2a1_bx_pc_insn = 0x4778; -static const insn16 t2a2_noop_insn = 0x46c0; -static const insn32 t2a3_b_insn = 0xea000000; - -#ifndef ELFARM_NABI_C_INCLUDED -bfd_boolean -bfd_elf32_arm_allocate_interworking_sections (info) - struct bfd_link_info * info; -{ - asection * s; - bfd_byte * foo; - struct elf32_arm_link_hash_table * globals; - - globals = elf32_arm_hash_table (info); - - BFD_ASSERT (globals != NULL); - - if (globals->arm_glue_size != 0) - { - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - s = bfd_get_section_by_name (globals->bfd_of_glue_owner, - ARM2THUMB_GLUE_SECTION_NAME); - - BFD_ASSERT (s != NULL); - - foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner, - globals->arm_glue_size); - - s->_raw_size = s->_cooked_size = globals->arm_glue_size; - s->contents = foo; - } - - if (globals->thumb_glue_size != 0) - { - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - s = bfd_get_section_by_name - (globals->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); - - BFD_ASSERT (s != NULL); - - foo = (bfd_byte *) bfd_alloc (globals->bfd_of_glue_owner, - globals->thumb_glue_size); - - s->_raw_size = s->_cooked_size = globals->thumb_glue_size; - s->contents = foo; - } - - return TRUE; -} - -static void -record_arm_to_thumb_glue (link_info, h) - struct bfd_link_info * link_info; - struct elf_link_hash_entry * h; -{ - const char * name = h->root.root.string; - asection * s; - char * tmp_name; - struct elf_link_hash_entry * myh; - struct bfd_link_hash_entry * bh; - struct elf32_arm_link_hash_table * globals; - bfd_vma val; - - globals = elf32_arm_hash_table (link_info); - - BFD_ASSERT (globals != NULL); - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - s = bfd_get_section_by_name - (globals->bfd_of_glue_owner, ARM2THUMB_GLUE_SECTION_NAME); - - BFD_ASSERT (s != NULL); - - tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) - + strlen (ARM2THUMB_GLUE_ENTRY_NAME) + 1); - - BFD_ASSERT (tmp_name); - - sprintf (tmp_name, ARM2THUMB_GLUE_ENTRY_NAME, name); - - myh = elf_link_hash_lookup - (&(globals)->root, tmp_name, FALSE, FALSE, TRUE); - - if (myh != NULL) - { - /* We've already seen this guy. */ - free (tmp_name); - return; - } - - /* The only trick here is using hash_table->arm_glue_size as the value. Even - though the section isn't allocated yet, this is where we will be putting - it. */ - bh = NULL; - val = globals->arm_glue_size + 1; - _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, - tmp_name, BSF_GLOBAL, s, val, - NULL, TRUE, FALSE, &bh); - - free (tmp_name); - - globals->arm_glue_size += ARM2THUMB_GLUE_SIZE; - - return; -} - -static void -record_thumb_to_arm_glue (link_info, h) - struct bfd_link_info *link_info; - struct elf_link_hash_entry *h; -{ - const char *name = h->root.root.string; - asection *s; - char *tmp_name; - struct elf_link_hash_entry *myh; - struct bfd_link_hash_entry *bh; - struct elf32_arm_link_hash_table *hash_table; - char bind; - bfd_vma val; - - hash_table = elf32_arm_hash_table (link_info); - - BFD_ASSERT (hash_table != NULL); - BFD_ASSERT (hash_table->bfd_of_glue_owner != NULL); - - s = bfd_get_section_by_name - (hash_table->bfd_of_glue_owner, THUMB2ARM_GLUE_SECTION_NAME); - - BFD_ASSERT (s != NULL); - - tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) - + strlen (THUMB2ARM_GLUE_ENTRY_NAME) + 1); - - BFD_ASSERT (tmp_name); - - sprintf (tmp_name, THUMB2ARM_GLUE_ENTRY_NAME, name); - - myh = elf_link_hash_lookup - (&(hash_table)->root, tmp_name, FALSE, FALSE, TRUE); - - if (myh != NULL) - { - /* We've already seen this guy. */ - free (tmp_name); - return; - } - - bh = NULL; - val = hash_table->thumb_glue_size + 1; - _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, - tmp_name, BSF_GLOBAL, s, val, - NULL, TRUE, FALSE, &bh); - - /* If we mark it 'Thumb', the disassembler will do a better job. */ - myh = (struct elf_link_hash_entry *) bh; - bind = ELF_ST_BIND (myh->type); - myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); - - free (tmp_name); - -#define CHANGE_TO_ARM "__%s_change_to_arm" -#define BACK_FROM_ARM "__%s_back_from_arm" - - /* Allocate another symbol to mark where we switch to Arm mode. */ - tmp_name = (char *) bfd_malloc ((bfd_size_type) strlen (name) - + strlen (CHANGE_TO_ARM) + 1); - - BFD_ASSERT (tmp_name); - - sprintf (tmp_name, CHANGE_TO_ARM, name); - - bh = NULL; - val = hash_table->thumb_glue_size + 4, - _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, - tmp_name, BSF_LOCAL, s, val, - NULL, TRUE, FALSE, &bh); - - free (tmp_name); - - hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; - - return; -} - -/* Add the glue sections to ABFD. This function is called from the - linker scripts in ld/emultempl/{armelf}.em. */ - -bfd_boolean -bfd_elf32_arm_add_glue_sections_to_bfd (abfd, info) - bfd *abfd; - struct bfd_link_info *info; -{ - flagword flags; - asection *sec; - - /* If we are only performing a partial - link do not bother adding the glue. */ - if (info->relocatable) - return TRUE; - - sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); - - if (sec == NULL) - { - /* Note: we do not include the flag SEC_LINKER_CREATED, as this - will prevent elf_link_input_bfd() from processing the contents - of this section. */ - flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; - - sec = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME); - - if (sec == NULL - || !bfd_set_section_flags (abfd, sec, flags) - || !bfd_set_section_alignment (abfd, sec, 2)) - return FALSE; - - /* Set the gc mark to prevent the section from being removed by garbage - collection, despite the fact that no relocs refer to this section. */ - sec->gc_mark = 1; - } - - sec = bfd_get_section_by_name (abfd, THUMB2ARM_GLUE_SECTION_NAME); - - if (sec == NULL) - { - flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_CODE | SEC_READONLY; - - sec = bfd_make_section (abfd, THUMB2ARM_GLUE_SECTION_NAME); - - if (sec == NULL - || !bfd_set_section_flags (abfd, sec, flags) - || !bfd_set_section_alignment (abfd, sec, 2)) - return FALSE; - - sec->gc_mark = 1; - } - - return TRUE; -} - -/* Select a BFD to be used to hold the sections used by the glue code. - This function is called from the linker scripts in ld/emultempl/ - {armelf/pe}.em */ - -bfd_boolean -bfd_elf32_arm_get_bfd_for_interworking (abfd, info) - bfd *abfd; - struct bfd_link_info *info; -{ - struct elf32_arm_link_hash_table *globals; - - /* If we are only performing a partial link - do not bother getting a bfd to hold the glue. */ - if (info->relocatable) - return TRUE; - - globals = elf32_arm_hash_table (info); - - BFD_ASSERT (globals != NULL); - - if (globals->bfd_of_glue_owner != NULL) - return TRUE; - - /* Save the bfd for later use. */ - globals->bfd_of_glue_owner = abfd; - - return TRUE; -} - -bfd_boolean -bfd_elf32_arm_process_before_allocation (abfd, link_info, no_pipeline_knowledge) - bfd *abfd; - struct bfd_link_info *link_info; - int no_pipeline_knowledge; -{ - Elf_Internal_Shdr *symtab_hdr; - Elf_Internal_Rela *internal_relocs = NULL; - Elf_Internal_Rela *irel, *irelend; - bfd_byte *contents = NULL; - - asection *sec; - struct elf32_arm_link_hash_table *globals; - - /* If we are only performing a partial link do not bother - to construct any glue. */ - if (link_info->relocatable) - return TRUE; - - /* Here we have a bfd that is to be included on the link. We have a hook - to do reloc rummaging, before section sizes are nailed down. */ - globals = elf32_arm_hash_table (link_info); - - BFD_ASSERT (globals != NULL); - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - globals->no_pipeline_knowledge = no_pipeline_knowledge; - - /* Rummage around all the relocs and map the glue vectors. */ - sec = abfd->sections; - - if (sec == NULL) - return TRUE; - - for (; sec != NULL; sec = sec->next) - { - if (sec->reloc_count == 0) - continue; - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - - /* Load the relocs. */ - internal_relocs - = _bfd_elf_link_read_relocs (abfd, sec, (PTR) NULL, - (Elf_Internal_Rela *) NULL, FALSE); - - if (internal_relocs == NULL) - goto error_return; - - irelend = internal_relocs + sec->reloc_count; - for (irel = internal_relocs; irel < irelend; irel++) - { - long r_type; - unsigned long r_index; - - struct elf_link_hash_entry *h; - - r_type = ELF32_R_TYPE (irel->r_info); - r_index = ELF32_R_SYM (irel->r_info); - - /* These are the only relocation types we care about. */ - if ( r_type != R_ARM_PC24 - && r_type != R_ARM_THM_PC22) - continue; - - /* Get the section contents if we haven't done so already. */ - if (contents == NULL) - { - /* Get cached copy if it exists. */ - if (elf_section_data (sec)->this_hdr.contents != NULL) - contents = elf_section_data (sec)->this_hdr.contents; - else - { - /* Go get them off disk. */ - contents = (bfd_byte *) bfd_malloc (sec->_raw_size); - if (contents == NULL) - goto error_return; - - if (!bfd_get_section_contents (abfd, sec, contents, - (file_ptr) 0, sec->_raw_size)) - goto error_return; - } - } - - /* If the relocation is not against a symbol it cannot concern us. */ - h = NULL; - - /* We don't care about local symbols. */ - if (r_index < symtab_hdr->sh_info) - continue; - - /* This is an external symbol. */ - r_index -= symtab_hdr->sh_info; - h = (struct elf_link_hash_entry *) - elf_sym_hashes (abfd)[r_index]; - - /* If the relocation is against a static symbol it must be within - the current section and so cannot be a cross ARM/Thumb relocation. */ - if (h == NULL) - continue; - - switch (r_type) - { - case R_ARM_PC24: - /* This one is a call from arm code. We need to look up - the target of the call. If it is a thumb target, we - insert glue. */ - if (ELF_ST_TYPE(h->type) == STT_ARM_TFUNC) - record_arm_to_thumb_glue (link_info, h); - break; - - case R_ARM_THM_PC22: - /* This one is a call from thumb code. We look - up the target of the call. If it is not a thumb - target, we insert glue. */ - if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC) - record_thumb_to_arm_glue (link_info, h); - break; - - default: - break; - } - } - - if (contents != NULL - && elf_section_data (sec)->this_hdr.contents != contents) - free (contents); - contents = NULL; - - if (internal_relocs != NULL - && elf_section_data (sec)->relocs != internal_relocs) - free (internal_relocs); - internal_relocs = NULL; - } - - return TRUE; - -error_return: - if (contents != NULL - && elf_section_data (sec)->this_hdr.contents != contents) - free (contents); - if (internal_relocs != NULL - && elf_section_data (sec)->relocs != internal_relocs) - free (internal_relocs); - - return FALSE; -} -#endif - -/* The thumb form of a long branch is a bit finicky, because the offset - encoding is split over two fields, each in it's own instruction. They - can occur in any order. So given a thumb form of long branch, and an - offset, insert the offset into the thumb branch and return finished - instruction. - - It takes two thumb instructions to encode the target address. Each has - 11 bits to invest. The upper 11 bits are stored in one (identified by - H-0.. see below), the lower 11 bits are stored in the other (identified - by H-1). - - Combine together and shifted left by 1 (it's a half word address) and - there you have it. - - Op: 1111 = F, - H-0, upper address-0 = 000 - Op: 1111 = F, - H-1, lower address-0 = 800 - - They can be ordered either way, but the arm tools I've seen always put - the lower one first. It probably doesn't matter. krk@cygnus.com - - XXX: Actually the order does matter. The second instruction (H-1) - moves the computed address into the PC, so it must be the second one - in the sequence. The problem, however is that whilst little endian code - stores the instructions in HI then LOW order, big endian code does the - reverse. nickc@cygnus.com. */ - -#define LOW_HI_ORDER 0xF800F000 -#define HI_LOW_ORDER 0xF000F800 - -static insn32 -insert_thumb_branch (br_insn, rel_off) - insn32 br_insn; - int rel_off; -{ - unsigned int low_bits; - unsigned int high_bits; - - BFD_ASSERT ((rel_off & 1) != 1); - - rel_off >>= 1; /* Half word aligned address. */ - low_bits = rel_off & 0x000007FF; /* The bottom 11 bits. */ - high_bits = (rel_off >> 11) & 0x000007FF; /* The top 11 bits. */ - - if ((br_insn & LOW_HI_ORDER) == LOW_HI_ORDER) - br_insn = LOW_HI_ORDER | (low_bits << 16) | high_bits; - else if ((br_insn & HI_LOW_ORDER) == HI_LOW_ORDER) - br_insn = HI_LOW_ORDER | (high_bits << 16) | low_bits; - else - /* FIXME: abort is probably not the right call. krk@cygnus.com */ - abort (); /* error - not a valid branch instruction form. */ - - return br_insn; -} - -/* Thumb code calling an ARM function. */ - -static int -elf32_thumb_to_arm_stub (info, name, input_bfd, output_bfd, input_section, - hit_data, sym_sec, offset, addend, val) - struct bfd_link_info * info; - const char * name; - bfd * input_bfd; - bfd * output_bfd; - asection * input_section; - bfd_byte * hit_data; - asection * sym_sec; - bfd_vma offset; - bfd_signed_vma addend; - bfd_vma val; -{ - asection * s = 0; - bfd_vma my_offset; - unsigned long int tmp; - long int ret_offset; - struct elf_link_hash_entry * myh; - struct elf32_arm_link_hash_table * globals; - - myh = find_thumb_glue (info, name, input_bfd); - if (myh == NULL) - return FALSE; - - globals = elf32_arm_hash_table (info); - - BFD_ASSERT (globals != NULL); - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - my_offset = myh->root.u.def.value; - - s = bfd_get_section_by_name (globals->bfd_of_glue_owner, - THUMB2ARM_GLUE_SECTION_NAME); - - BFD_ASSERT (s != NULL); - BFD_ASSERT (s->contents != NULL); - BFD_ASSERT (s->output_section != NULL); - - if ((my_offset & 0x01) == 0x01) - { - if (sym_sec != NULL - && sym_sec->owner != NULL - && !INTERWORK_FLAG (sym_sec->owner)) - { - (*_bfd_error_handler) - (_("%s(%s): warning: interworking not enabled."), - bfd_archive_filename (sym_sec->owner), name); - (*_bfd_error_handler) - (_(" first occurrence: %s: thumb call to arm"), - bfd_archive_filename (input_bfd)); - - return FALSE; - } - - --my_offset; - myh->root.u.def.value = my_offset; - - bfd_put_16 (output_bfd, (bfd_vma) t2a1_bx_pc_insn, - s->contents + my_offset); - - bfd_put_16 (output_bfd, (bfd_vma) t2a2_noop_insn, - s->contents + my_offset + 2); - - ret_offset = - /* Address of destination of the stub. */ - ((bfd_signed_vma) val) - - ((bfd_signed_vma) - /* Offset from the start of the current section to the start of the stubs. */ - (s->output_offset - /* Offset of the start of this stub from the start of the stubs. */ - + my_offset - /* Address of the start of the current section. */ - + s->output_section->vma) - /* The branch instruction is 4 bytes into the stub. */ - + 4 - /* ARM branches work from the pc of the instruction + 8. */ - + 8); - - bfd_put_32 (output_bfd, - (bfd_vma) t2a3_b_insn | ((ret_offset >> 2) & 0x00FFFFFF), - s->contents + my_offset + 4); - } - - BFD_ASSERT (my_offset <= globals->thumb_glue_size); - - /* Now go back and fix up the original BL insn to point to here. */ - ret_offset = - /* Address of where the stub is located. */ - (s->output_section->vma + s->output_offset + my_offset) - /* Address of where the BL is located. */ - - (input_section->output_section->vma + input_section->output_offset + offset) - /* Addend in the relocation. */ - - addend - /* Biassing for PC-relative addressing. */ - - 8; - - tmp = bfd_get_32 (input_bfd, hit_data - - input_section->vma); - - bfd_put_32 (output_bfd, - (bfd_vma) insert_thumb_branch (tmp, ret_offset), - hit_data - input_section->vma); - - return TRUE; -} - -/* Arm code calling a Thumb function. */ - -static int -elf32_arm_to_thumb_stub (info, name, input_bfd, output_bfd, input_section, - hit_data, sym_sec, offset, addend, val) - struct bfd_link_info * info; - const char * name; - bfd * input_bfd; - bfd * output_bfd; - asection * input_section; - bfd_byte * hit_data; - asection * sym_sec; - bfd_vma offset; - bfd_signed_vma addend; - bfd_vma val; -{ - unsigned long int tmp; - bfd_vma my_offset; - asection * s; - long int ret_offset; - struct elf_link_hash_entry * myh; - struct elf32_arm_link_hash_table * globals; - - myh = find_arm_glue (info, name, input_bfd); - if (myh == NULL) - return FALSE; - - globals = elf32_arm_hash_table (info); - - BFD_ASSERT (globals != NULL); - BFD_ASSERT (globals->bfd_of_glue_owner != NULL); - - my_offset = myh->root.u.def.value; - s = bfd_get_section_by_name (globals->bfd_of_glue_owner, - ARM2THUMB_GLUE_SECTION_NAME); - BFD_ASSERT (s != NULL); - BFD_ASSERT (s->contents != NULL); - BFD_ASSERT (s->output_section != NULL); - - if ((my_offset & 0x01) == 0x01) - { - if (sym_sec != NULL - && sym_sec->owner != NULL - && !INTERWORK_FLAG (sym_sec->owner)) - { - (*_bfd_error_handler) - (_("%s(%s): warning: interworking not enabled."), - bfd_archive_filename (sym_sec->owner), name); - (*_bfd_error_handler) - (_(" first occurrence: %s: arm call to thumb"), - bfd_archive_filename (input_bfd)); - } - - --my_offset; - myh->root.u.def.value = my_offset; - - bfd_put_32 (output_bfd, (bfd_vma) a2t1_ldr_insn, - s->contents + my_offset); - - bfd_put_32 (output_bfd, (bfd_vma) a2t2_bx_r12_insn, - s->contents + my_offset + 4); - - /* It's a thumb address. Add the low order bit. */ - bfd_put_32 (output_bfd, val | a2t3_func_addr_insn, - s->contents + my_offset + 8); - } - - BFD_ASSERT (my_offset <= globals->arm_glue_size); - - tmp = bfd_get_32 (input_bfd, hit_data); - tmp = tmp & 0xFF000000; - - /* Somehow these are both 4 too far, so subtract 8. */ - ret_offset = (s->output_offset - + my_offset - + s->output_section->vma - - (input_section->output_offset - + input_section->output_section->vma - + offset + addend) - - 8); - - tmp = tmp | ((ret_offset >> 2) & 0x00FFFFFF); - - bfd_put_32 (output_bfd, (bfd_vma) tmp, hit_data - input_section->vma); - - return TRUE; -} - -/* Perform a relocation as part of a final link. */ - -static bfd_reloc_status_type -elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, - input_section, contents, rel, value, - info, sym_sec, sym_name, sym_flags, h) - reloc_howto_type * howto; - bfd * input_bfd; - bfd * output_bfd; - asection * input_section; - bfd_byte * contents; - Elf_Internal_Rela * rel; - bfd_vma value; - struct bfd_link_info * info; - asection * sym_sec; - const char * sym_name; - int sym_flags; - struct elf_link_hash_entry * h; -{ - unsigned long r_type = howto->type; - unsigned long r_symndx; - bfd_byte * hit_data = contents + rel->r_offset; - bfd * dynobj = NULL; - Elf_Internal_Shdr * symtab_hdr; - struct elf_link_hash_entry ** sym_hashes; - bfd_vma * local_got_offsets; - asection * sgot = NULL; - asection * splt = NULL; - asection * sreloc = NULL; - bfd_vma addend; - bfd_signed_vma signed_addend; - struct elf32_arm_link_hash_table * globals; - - /* If the start address has been set, then set the EF_ARM_HASENTRY - flag. Setting this more than once is redundant, but the cost is - not too high, and it keeps the code simple. - - The test is done here, rather than somewhere else, because the - start address is only set just before the final link commences. - - Note - if the user deliberately sets a start address of 0, the - flag will not be set. */ - if (bfd_get_start_address (output_bfd) != 0) - elf_elfheader (output_bfd)->e_flags |= EF_ARM_HASENTRY; - - globals = elf32_arm_hash_table (info); - - dynobj = elf_hash_table (info)->dynobj; - if (dynobj) - { - sgot = bfd_get_section_by_name (dynobj, ".got"); - splt = bfd_get_section_by_name (dynobj, ".plt"); - } - symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (input_bfd); - local_got_offsets = elf_local_got_offsets (input_bfd); - r_symndx = ELF32_R_SYM (rel->r_info); - -#if USE_REL - addend = bfd_get_32 (input_bfd, hit_data) & howto->src_mask; - - if (addend & ((howto->src_mask + 1) >> 1)) - { - signed_addend = -1; - signed_addend &= ~ howto->src_mask; - signed_addend |= addend; - } - else - signed_addend = addend; -#else - addend = signed_addend = rel->r_addend; -#endif - - switch (r_type) - { - case R_ARM_NONE: - return bfd_reloc_ok; - - case R_ARM_PC24: - case R_ARM_ABS32: - case R_ARM_REL32: -#ifndef OLD_ARM_ABI - case R_ARM_XPC25: -#endif - case R_ARM_PLT32: - /* 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) - return bfd_reloc_ok; - - /* Handle relocations which should use the PLT entry. ABS32/REL32 - will use the symbol's value, which may point to a PLT entry, but we - don't need to handle that here. If we created a PLT entry, all - branches in this object should go to it. */ - if ((r_type != R_ARM_ABS32 && r_type != R_ARM_REL32) - && h != NULL - && splt != NULL - && h->plt.offset != (bfd_vma) -1) - { - /* If we've created a .plt section, and assigned a PLT entry to - this function, it should not be known to bind locally. If - it were, we would have cleared the PLT entry. */ - BFD_ASSERT (!SYMBOL_CALLS_LOCAL (info, h)); - - value = (splt->output_section->vma - + splt->output_offset - + h->plt.offset); - return _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, value, - (bfd_vma) 0); - } - - /* When generating a shared object, these relocations are copied - into the output file to be resolved at run time. */ - if (info->shared - && (input_section->flags & SEC_ALLOC) - && (r_type != R_ARM_REL32 - || !SYMBOL_CALLS_LOCAL (info, h)) - && (h == NULL - || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && r_type != R_ARM_PC24 - && r_type != R_ARM_PLT32) - { - Elf_Internal_Rela outrel; - bfd_byte *loc; - bfd_boolean skip, relocate; - - 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 bfd_reloc_notsupported; - - BFD_ASSERT (strncmp (name, ".rel", 4) == 0 - && strcmp (bfd_get_section_name (input_bfd, - input_section), - name + 4) == 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, - 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->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - outrel.r_info = ELF32_R_INFO (h->dynindx, r_type); - else - { - /* This symbol is local, or marked to become local. */ - relocate = TRUE; - outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); - } - - loc = sreloc->contents; - loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); - - /* 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) - return bfd_reloc_ok; - - return _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, value, - (bfd_vma) 0); - } - else switch (r_type) - { -#ifndef OLD_ARM_ABI - case R_ARM_XPC25: /* Arm BLX instruction. */ -#endif - case R_ARM_PC24: /* Arm B/BL instruction */ - case R_ARM_PLT32: -#ifndef OLD_ARM_ABI - if (r_type == R_ARM_XPC25) - { - /* Check for Arm calling Arm function. */ - /* FIXME: Should we translate the instruction into a BL - instruction instead ? */ - if (sym_flags != STT_ARM_TFUNC) - (*_bfd_error_handler) (_("\ -%s: Warning: Arm BLX instruction targets Arm function '%s'."), - bfd_archive_filename (input_bfd), - h ? h->root.root.string : "(local)"); - } - else -#endif - { - /* Check for Arm calling Thumb function. */ - if (sym_flags == STT_ARM_TFUNC) - { - elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd, - input_section, hit_data, sym_sec, rel->r_offset, - signed_addend, value); - return bfd_reloc_ok; - } - } - - if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 - || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0) - { - /* The old way of doing things. Trearing the addend as a - byte sized field and adding in the pipeline offset. */ - value -= (input_section->output_section->vma - + input_section->output_offset); - value -= rel->r_offset; - value += addend; - - if (! globals->no_pipeline_knowledge) - value -= 8; - } - else - { - /* The ARM ELF ABI says that this reloc is computed as: S - P + A - where: - S is the address of the symbol in the relocation. - P is address of the instruction being relocated. - A is the addend (extracted from the instruction) in bytes. - - S is held in 'value'. - P is the base address of the section containing the instruction - plus the offset of the reloc into that section, ie: - (input_section->output_section->vma + - input_section->output_offset + - rel->r_offset). - A is the addend, converted into bytes, ie: - (signed_addend * 4) - - Note: None of these operations have knowledge of the pipeline - size of the processor, thus it is up to the assembler to encode - this information into the addend. */ - value -= (input_section->output_section->vma - + input_section->output_offset); - value -= rel->r_offset; - value += (signed_addend << howto->size); - - /* Previous versions of this code also used to add in the pipeline - offset here. This is wrong because the linker is not supposed - to know about such things, and one day it might change. In order - to support old binaries that need the old behaviour however, so - we attempt to detect which ABI was used to create the reloc. */ - if (! globals->no_pipeline_knowledge) - { - Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form */ - - i_ehdrp = elf_elfheader (input_bfd); - - if (i_ehdrp->e_ident[EI_OSABI] == 0) - value -= 8; - } - } - - signed_addend = value; - signed_addend >>= howto->rightshift; - - /* It is not an error for an undefined weak reference to be - out of range. Any program that branches to such a symbol - is going to crash anyway, so there is no point worrying - about getting the destination exactly right. */ - if (! h || h->root.type != bfd_link_hash_undefweak) - { - /* Perform a signed range check. */ - if ( signed_addend > ((bfd_signed_vma) (howto->dst_mask >> 1)) - || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1))) - return bfd_reloc_overflow; - } - -#ifndef OLD_ARM_ABI - /* If necessary set the H bit in the BLX instruction. */ - if (r_type == R_ARM_XPC25 && ((value & 2) == 2)) - value = (signed_addend & howto->dst_mask) - | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)) - | (1 << 24); - else -#endif - value = (signed_addend & howto->dst_mask) - | (bfd_get_32 (input_bfd, hit_data) & (~ howto->dst_mask)); - break; - - case R_ARM_ABS32: - value += addend; - if (sym_flags == STT_ARM_TFUNC) - value |= 1; - break; - - case R_ARM_REL32: - value -= (input_section->output_section->vma - + input_section->output_offset + rel->r_offset); - value += addend; - break; - } - - bfd_put_32 (input_bfd, value, hit_data); - return bfd_reloc_ok; - - case R_ARM_ABS8: - value += addend; - if ((long) value > 0x7f || (long) value < -0x80) - return bfd_reloc_overflow; - - bfd_put_8 (input_bfd, value, hit_data); - return bfd_reloc_ok; - - case R_ARM_ABS16: - value += addend; - - if ((long) value > 0x7fff || (long) value < -0x8000) - return bfd_reloc_overflow; - - bfd_put_16 (input_bfd, value, hit_data); - return bfd_reloc_ok; - - case R_ARM_ABS12: - /* Support ldr and str instruction for the arm */ - /* Also thumb b (unconditional branch). ??? Really? */ - value += addend; - - if ((long) value > 0x7ff || (long) value < -0x800) - return bfd_reloc_overflow; - - value |= (bfd_get_32 (input_bfd, hit_data) & 0xfffff000); - bfd_put_32 (input_bfd, value, hit_data); - return bfd_reloc_ok; - - case R_ARM_THM_ABS5: - /* Support ldr and str instructions for the thumb. */ -#if USE_REL - /* Need to refetch addend. */ - addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; - /* ??? Need to determine shift amount from operand size. */ - addend >>= howto->rightshift; -#endif - value += addend; - - /* ??? Isn't value unsigned? */ - if ((long) value > 0x1f || (long) value < -0x10) - return bfd_reloc_overflow; - - /* ??? Value needs to be properly shifted into place first. */ - value |= bfd_get_16 (input_bfd, hit_data) & 0xf83f; - bfd_put_16 (input_bfd, value, hit_data); - return bfd_reloc_ok; - -#ifndef OLD_ARM_ABI - case R_ARM_THM_XPC22: -#endif - case R_ARM_THM_PC22: - /* Thumb BL (branch long instruction). */ - { - bfd_vma relocation; - bfd_boolean overflow = FALSE; - bfd_vma upper_insn = bfd_get_16 (input_bfd, hit_data); - bfd_vma lower_insn = bfd_get_16 (input_bfd, hit_data + 2); - bfd_signed_vma reloc_signed_max = ((1 << (howto->bitsize - 1)) - 1) >> howto->rightshift; - bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; - bfd_vma check; - bfd_signed_vma signed_check; - -#if USE_REL - /* Need to refetch the addend and squish the two 11 bit pieces - together. */ - { - bfd_vma upper = upper_insn & 0x7ff; - bfd_vma lower = lower_insn & 0x7ff; - upper = (upper ^ 0x400) - 0x400; /* Sign extend. */ - addend = (upper << 12) | (lower << 1); - signed_addend = addend; - } -#endif -#ifndef OLD_ARM_ABI - if (r_type == R_ARM_THM_XPC22) - { - /* Check for Thumb to Thumb call. */ - /* FIXME: Should we translate the instruction into a BL - instruction instead ? */ - if (sym_flags == STT_ARM_TFUNC) - (*_bfd_error_handler) (_("\ -%s: Warning: Thumb BLX instruction targets thumb function '%s'."), - bfd_archive_filename (input_bfd), - h ? h->root.root.string : "(local)"); - } - else -#endif - { - /* If it is not a call to Thumb, assume call to Arm. - If it is a call relative to a section name, then it is not a - function call at all, but rather a long jump. */ - if (sym_flags != STT_ARM_TFUNC && sym_flags != STT_SECTION) - { - if (elf32_thumb_to_arm_stub - (info, sym_name, input_bfd, output_bfd, input_section, - hit_data, sym_sec, rel->r_offset, signed_addend, value)) - return bfd_reloc_ok; - else - return bfd_reloc_dangerous; - } - } - - relocation = value + signed_addend; - - relocation -= (input_section->output_section->vma - + input_section->output_offset - + rel->r_offset); - - if (! globals->no_pipeline_knowledge) - { - Elf_Internal_Ehdr * i_ehdrp; /* Elf file header, internal form. */ - - i_ehdrp = elf_elfheader (input_bfd); - - /* Previous versions of this code also used to add in the pipline - offset here. This is wrong because the linker is not supposed - to know about such things, and one day it might change. In order - to support old binaries that need the old behaviour however, so - we attempt to detect which ABI was used to create the reloc. */ - if ( strcmp (bfd_get_target (input_bfd), "elf32-littlearm-oabi") == 0 - || strcmp (bfd_get_target (input_bfd), "elf32-bigarm-oabi") == 0 - || i_ehdrp->e_ident[EI_OSABI] == 0) - relocation += 4; - } - - check = relocation >> howto->rightshift; - - /* If this is a signed value, the rightshift just dropped - leading 1 bits (assuming twos complement). */ - if ((bfd_signed_vma) relocation >= 0) - signed_check = check; - else - signed_check = check | ~((bfd_vma) -1 >> howto->rightshift); - - /* Assumes two's complement. */ - if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) - overflow = TRUE; - -#ifndef OLD_ARM_ABI - if (r_type == R_ARM_THM_XPC22 - && ((lower_insn & 0x1800) == 0x0800)) - /* For a BLX instruction, make sure that the relocation is rounded up - to a word boundary. This follows the semantics of the instruction - which specifies that bit 1 of the target address will come from bit - 1 of the base address. */ - relocation = (relocation + 2) & ~ 3; -#endif - /* Put RELOCATION back into the insn. */ - upper_insn = (upper_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 12) & 0x7ff); - lower_insn = (lower_insn & ~(bfd_vma) 0x7ff) | ((relocation >> 1) & 0x7ff); - - /* Put the relocated value back in the object file: */ - bfd_put_16 (input_bfd, upper_insn, hit_data); - bfd_put_16 (input_bfd, lower_insn, hit_data + 2); - - return (overflow ? bfd_reloc_overflow : bfd_reloc_ok); - } - break; - - case R_ARM_THM_PC11: - /* Thumb B (branch) instruction). */ - { - bfd_signed_vma relocation; - bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; - bfd_signed_vma reloc_signed_min = ~ reloc_signed_max; - bfd_signed_vma signed_check; - -#if USE_REL - /* Need to refetch addend. */ - addend = bfd_get_16 (input_bfd, hit_data) & howto->src_mask; - if (addend & ((howto->src_mask + 1) >> 1)) - { - signed_addend = -1; - signed_addend &= ~ howto->src_mask; - signed_addend |= addend; - } - else - signed_addend = addend; - /* The value in the insn has been right shifted. We need to - undo this, so that we can perform the address calculation - in terms of bytes. */ - signed_addend <<= howto->rightshift; -#endif - relocation = value + signed_addend; - - relocation -= (input_section->output_section->vma - + input_section->output_offset - + rel->r_offset); - - relocation >>= howto->rightshift; - signed_check = relocation; - relocation &= howto->dst_mask; - relocation |= (bfd_get_16 (input_bfd, hit_data) & (~ howto->dst_mask)); - - bfd_put_16 (input_bfd, relocation, hit_data); - - /* Assumes two's complement. */ - if (signed_check > reloc_signed_max || signed_check < reloc_signed_min) - return bfd_reloc_overflow; - - return bfd_reloc_ok; - } - - case R_ARM_GNU_VTINHERIT: - case R_ARM_GNU_VTENTRY: - return bfd_reloc_ok; - - case R_ARM_COPY: - return bfd_reloc_notsupported; - - case R_ARM_GLOB_DAT: - return bfd_reloc_notsupported; - - case R_ARM_JUMP_SLOT: - return bfd_reloc_notsupported; - - case R_ARM_RELATIVE: - return bfd_reloc_notsupported; - - case R_ARM_GOTOFF: - /* Relocation is relative to the start of the - global offset table. */ - - BFD_ASSERT (sgot != NULL); - if (sgot == NULL) - return bfd_reloc_notsupported; - - /* If we are addressing a Thumb function, we need to adjust the - address by one, so that attempts to call the function pointer will - correctly interpret it as Thumb code. */ - if (sym_flags == STT_ARM_TFUNC) - value += 1; - - /* Note that sgot->output_offset is not involved in this - calculation. We always want the start of .got. If we - define _GLOBAL_OFFSET_TABLE in a different way, as is - permitted by the ABI, we might have to change this - calculation. */ - value -= sgot->output_section->vma; - return _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, value, - (bfd_vma) 0); - - case R_ARM_GOTPC: - /* Use global offset table as symbol value. */ - BFD_ASSERT (sgot != NULL); - - if (sgot == NULL) - return bfd_reloc_notsupported; - - value = sgot->output_section->vma; - return _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, value, - (bfd_vma) 0); - - case R_ARM_GOT32: - /* Relocation is to the entry for this symbol in the - global offset table. */ - if (sgot == NULL) - return bfd_reloc_notsupported; - - if (h != NULL) - { - bfd_vma off; - bfd_boolean dyn; - - off = h->got.offset; - BFD_ASSERT (off != (bfd_vma) -1); - dyn = globals->root.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. 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 - { - /* If we are addressing a Thumb function, we need to - adjust the address by one, so that attempts to - call the function pointer will correctly - interpret it as Thumb code. */ - if (sym_flags == STT_ARM_TFUNC) - value |= 1; - - bfd_put_32 (output_bfd, value, sgot->contents + off); - h->got.offset |= 1; - } - } - - value = sgot->output_offset + off; - } - else - { - bfd_vma off; - - BFD_ASSERT (local_got_offsets != NULL && - local_got_offsets[r_symndx] != (bfd_vma) -1); - - 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, value, sgot->contents + off); - - if (info->shared) - { - asection * srelgot; - Elf_Internal_Rela outrel; - bfd_byte *loc; - - srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); - BFD_ASSERT (srelgot != NULL); - - outrel.r_offset = (sgot->output_section->vma - + sgot->output_offset - + off); - outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); - loc = srelgot->contents; - loc += srelgot->reloc_count++ * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc); - } - - local_got_offsets[r_symndx] |= 1; - } - - value = sgot->output_offset + off; - } - - return _bfd_final_link_relocate (howto, input_bfd, input_section, - contents, rel->r_offset, value, - (bfd_vma) 0); - - case R_ARM_SBREL32: - return bfd_reloc_notsupported; - - case R_ARM_AMP_VCALL9: - return bfd_reloc_notsupported; - - case R_ARM_RSBREL32: - return bfd_reloc_notsupported; - - case R_ARM_THM_RPC22: - return bfd_reloc_notsupported; - - case R_ARM_RREL32: - return bfd_reloc_notsupported; - - case R_ARM_RABS32: - return bfd_reloc_notsupported; - - case R_ARM_RPC24: - return bfd_reloc_notsupported; - - case R_ARM_RBASE: - return bfd_reloc_notsupported; - - default: - return bfd_reloc_notsupported; - } -} - -#if USE_REL -/* Add INCREMENT to the reloc (of type HOWTO) at ADDRESS. */ -static void -arm_add_to_rel (abfd, address, howto, increment) - bfd * abfd; - bfd_byte * address; - reloc_howto_type * howto; - bfd_signed_vma increment; -{ - bfd_signed_vma addend; - - if (howto->type == R_ARM_THM_PC22) - { - int upper_insn, lower_insn; - int upper, lower; - - upper_insn = bfd_get_16 (abfd, address); - lower_insn = bfd_get_16 (abfd, address + 2); - upper = upper_insn & 0x7ff; - lower = lower_insn & 0x7ff; - - addend = (upper << 12) | (lower << 1); - addend += increment; - addend >>= 1; - - upper_insn = (upper_insn & 0xf800) | ((addend >> 11) & 0x7ff); - lower_insn = (lower_insn & 0xf800) | (addend & 0x7ff); - - bfd_put_16 (abfd, (bfd_vma) upper_insn, address); - bfd_put_16 (abfd, (bfd_vma) lower_insn, address + 2); - } - else - { - bfd_vma contents; - - contents = bfd_get_32 (abfd, address); - - /* Get the (signed) value from the instruction. */ - addend = contents & howto->src_mask; - if (addend & ((howto->src_mask + 1) >> 1)) - { - bfd_signed_vma mask; - - mask = -1; - mask &= ~ howto->src_mask; - addend |= mask; - } - - /* Add in the increment, (which is a byte value). */ - switch (howto->type) - { - default: - addend += increment; - break; - - case R_ARM_PC24: - addend <<= howto->size; - addend += increment; - - /* Should we check for overflow here ? */ - - /* Drop any undesired bits. */ - addend >>= howto->rightshift; - break; - } - - contents = (contents & ~ howto->dst_mask) | (addend & howto->dst_mask); - - bfd_put_32 (abfd, contents, address); - } -} -#endif /* USE_REL */ - -/* Relocate an ARM ELF section. */ -static bfd_boolean -elf32_arm_relocate_section (output_bfd, info, input_bfd, input_section, - contents, relocs, local_syms, local_sections) - bfd *output_bfd; - struct bfd_link_info *info; - bfd *input_bfd; - asection *input_section; - bfd_byte *contents; - Elf_Internal_Rela *relocs; - Elf_Internal_Sym *local_syms; - asection **local_sections; -{ - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - Elf_Internal_Rela *rel; - Elf_Internal_Rela *relend; - const char *name; - -#if !USE_REL - if (info->relocatable) - return TRUE; -#endif - - symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (input_bfd); - - rel = relocs; - relend = relocs + input_section->reloc_count; - for (; rel < relend; rel++) - { - int r_type; - reloc_howto_type * howto; - unsigned long r_symndx; - Elf_Internal_Sym * sym; - asection * sec; - struct elf_link_hash_entry * h; - bfd_vma relocation; - bfd_reloc_status_type r; - arelent bfd_reloc; - - r_symndx = ELF32_R_SYM (rel->r_info); - r_type = ELF32_R_TYPE (rel->r_info); - - if ( r_type == R_ARM_GNU_VTENTRY - || r_type == R_ARM_GNU_VTINHERIT) - continue; - - elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel); - howto = bfd_reloc.howto; - -#if USE_REL - if (info->relocatable) - { - /* This is a relocatable link. We don't have to change - anything, unless the reloc is against a section symbol, - in which case we have to adjust according to where the - section symbol winds up in the output section. */ - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - if (ELF_ST_TYPE (sym->st_info) == STT_SECTION) - { - sec = local_sections[r_symndx]; - arm_add_to_rel (input_bfd, contents + rel->r_offset, - howto, - (bfd_signed_vma) (sec->output_offset - + sym->st_value)); - } - } - - continue; - } -#endif - - /* This is a final link. */ - h = NULL; - sym = NULL; - sec = NULL; - - if (r_symndx < symtab_hdr->sh_info) - { - sym = local_syms + r_symndx; - sec = local_sections[r_symndx]; -#if USE_REL - relocation = (sec->output_section->vma - + sec->output_offset - + sym->st_value); - if ((sec->flags & SEC_MERGE) - && ELF_ST_TYPE (sym->st_info) == STT_SECTION) - { - asection *msec; - bfd_vma addend, value; - - if (howto->rightshift) - { - (*_bfd_error_handler) - (_("%s(%s+0x%lx): %s relocation against SEC_MERGE section"), - bfd_archive_filename (input_bfd), - bfd_get_section_name (input_bfd, input_section), - (long) rel->r_offset, howto->name); - return FALSE; - } - - value = bfd_get_32 (input_bfd, contents + rel->r_offset); - - /* Get the (signed) value from the instruction. */ - addend = value & howto->src_mask; - if (addend & ((howto->src_mask + 1) >> 1)) - { - bfd_signed_vma mask; - - mask = -1; - mask &= ~ howto->src_mask; - addend |= mask; - } - msec = sec; - addend = - _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend) - - relocation; - addend += msec->output_section->vma + msec->output_offset; - value = (value & ~ howto->dst_mask) | (addend & howto->dst_mask); - bfd_put_32 (input_bfd, value, contents + rel->r_offset); - } -#else - relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel); -#endif - } - else - { - bfd_boolean warned; - bfd_boolean unresolved_reloc; - - RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, - r_symndx, symtab_hdr, sym_hashes, - h, sec, relocation, - unresolved_reloc, warned); - - if (unresolved_reloc || relocation != 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. */ - switch (r_type) - { - case R_ARM_PC24: - case R_ARM_ABS32: - case R_ARM_THM_PC22: - case R_ARM_PLT32: - - if (info->shared - && ( - (!info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 - ) - && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - && ((input_section->flags & SEC_ALLOC) != 0 - /* DWARF will emit R_ARM_ABS32 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)) - ) - relocation = 0; - break; - - case R_ARM_GOTPC: - relocation = 0; - break; - - case R_ARM_GOT32: - if ((WILL_CALL_FINISH_DYNAMIC_SYMBOL - (elf_hash_table (info)->dynamic_sections_created, - info->shared, h)) - && (!info->shared - || (!info->symbolic && h->dynindx != -1) - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)) - relocation = 0; - break; - - default: - if (unresolved_reloc) - _bfd_error_handler - (_("%s: warning: unresolvable relocation %d against symbol `%s' from %s section"), - bfd_archive_filename (input_bfd), - r_type, - h->root.root.string, - bfd_get_section_name (input_bfd, input_section)); - break; - } - } - } - - 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 || *name == '\0') - name = bfd_section_name (input_bfd, sec); - } - - r = elf32_arm_final_link_relocate (howto, input_bfd, output_bfd, - input_section, contents, rel, - relocation, info, sec, name, - (h ? ELF_ST_TYPE (h->type) : - ELF_ST_TYPE (sym->st_info)), h); - - if (r != bfd_reloc_ok) - { - const char * msg = (const char *) 0; - - switch (r) - { - case bfd_reloc_overflow: - /* If the overflowing reloc was to an undefined symbol, - we have already printed one error message and there - is no point complaining again. */ - if ((! h || - h->root.type != bfd_link_hash_undefined) - && (!((*info->callbacks->reloc_overflow) - (info, name, howto->name, (bfd_vma) 0, - input_bfd, input_section, rel->r_offset)))) - return FALSE; - break; - - case bfd_reloc_undefined: - if (!((*info->callbacks->undefined_symbol) - (info, name, input_bfd, input_section, - rel->r_offset, TRUE))) - return FALSE; - break; - - case bfd_reloc_outofrange: - msg = _("internal error: out of range error"); - goto common_error; - - case bfd_reloc_notsupported: - msg = _("internal error: unsupported relocation error"); - goto common_error; - - case bfd_reloc_dangerous: - msg = _("internal error: dangerous error"); - goto common_error; - - default: - msg = _("internal error: unknown error"); - /* fall through */ - - common_error: - if (!((*info->callbacks->warning) - (info, msg, name, input_bfd, input_section, - rel->r_offset))) - return FALSE; - break; - } - } - } - - return TRUE; -} - -/* Set the right machine number. */ - -static bfd_boolean -elf32_arm_object_p (abfd) - bfd *abfd; -{ - unsigned int mach; - - mach = bfd_arm_get_mach_from_notes (abfd, ARM_NOTE_SECTION); - - if (mach != bfd_mach_arm_unknown) - bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); - - else if (elf_elfheader (abfd)->e_flags & EF_ARM_MAVERICK_FLOAT) - bfd_default_set_arch_mach (abfd, bfd_arch_arm, bfd_mach_arm_ep9312); - - else - bfd_default_set_arch_mach (abfd, bfd_arch_arm, mach); - - return TRUE; -} - -/* Function to keep ARM specific flags in the ELF header. */ -static bfd_boolean -elf32_arm_set_private_flags (abfd, flags) - bfd *abfd; - flagword flags; -{ - if (elf_flags_init (abfd) - && elf_elfheader (abfd)->e_flags != flags) - { - if (EF_ARM_EABI_VERSION (flags) == EF_ARM_EABI_UNKNOWN) - { - if (flags & EF_ARM_INTERWORK) - (*_bfd_error_handler) (_("\ -Warning: Not setting interworking flag of %s since it has already been specified as non-interworking"), - bfd_archive_filename (abfd)); - else - _bfd_error_handler (_("\ -Warning: Clearing the interworking flag of %s due to outside request"), - bfd_archive_filename (abfd)); - } - } - else - { - elf_elfheader (abfd)->e_flags = flags; - elf_flags_init (abfd) = TRUE; - } - - return TRUE; -} - -/* Copy backend specific data from one object module to another. */ - -static bfd_boolean -elf32_arm_copy_private_bfd_data (ibfd, obfd) - bfd *ibfd; - bfd *obfd; -{ - flagword in_flags; - flagword out_flags; - - if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) - return TRUE; - - in_flags = elf_elfheader (ibfd)->e_flags; - out_flags = elf_elfheader (obfd)->e_flags; - - if (elf_flags_init (obfd) - && EF_ARM_EABI_VERSION (out_flags) == EF_ARM_EABI_UNKNOWN - && in_flags != out_flags) - { - /* Cannot mix APCS26 and APCS32 code. */ - if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) - return FALSE; - - /* Cannot mix float APCS and non-float APCS code. */ - if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) - return FALSE; - - /* If the src and dest have different interworking flags - then turn off the interworking bit. */ - if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) - { - if (out_flags & EF_ARM_INTERWORK) - _bfd_error_handler (_("\ -Warning: Clearing the interworking flag of %s because non-interworking code in %s has been linked with it"), - bfd_get_filename (obfd), - bfd_archive_filename (ibfd)); - - in_flags &= ~EF_ARM_INTERWORK; - } - - /* Likewise for PIC, though don't warn for this case. */ - if ((in_flags & EF_ARM_PIC) != (out_flags & EF_ARM_PIC)) - in_flags &= ~EF_ARM_PIC; - } - - elf_elfheader (obfd)->e_flags = in_flags; - elf_flags_init (obfd) = TRUE; - - return TRUE; -} - -/* Merge backend specific data from an object file to the output - object file when linking. */ - -static bfd_boolean -elf32_arm_merge_private_bfd_data (ibfd, obfd) - bfd * ibfd; - bfd * obfd; -{ - flagword out_flags; - flagword in_flags; - bfd_boolean flags_compatible = TRUE; - asection *sec; - - /* Check if we have the same endianess. */ - if (! _bfd_generic_verify_endian_match (ibfd, obfd)) - return FALSE; - - if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour - || bfd_get_flavour (obfd) != bfd_target_elf_flavour) - return TRUE; - - /* The input BFD must have had its flags initialised. */ - /* The following seems bogus to me -- The flags are initialized in - the assembler but I don't think an elf_flags_init field is - written into the object. */ - /* BFD_ASSERT (elf_flags_init (ibfd)); */ - - in_flags = elf_elfheader (ibfd)->e_flags; - out_flags = elf_elfheader (obfd)->e_flags; - - if (!elf_flags_init (obfd)) - { - /* If the input is the default architecture and had the default - flags then do not bother setting the flags for the output - architecture, instead allow future merges to do this. If no - future merges ever set these flags then they will retain their - uninitialised values, which surprise surprise, correspond - to the default values. */ - if (bfd_get_arch_info (ibfd)->the_default - && elf_elfheader (ibfd)->e_flags == 0) - return TRUE; - - elf_flags_init (obfd) = TRUE; - elf_elfheader (obfd)->e_flags = in_flags; - - if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) - && bfd_get_arch_info (obfd)->the_default) - return bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), bfd_get_mach (ibfd)); - - return TRUE; - } - - /* Determine what should happen if the input ARM architecture - does not match the output ARM architecture. */ - if (! bfd_arm_merge_machines (ibfd, obfd)) - return FALSE; - - /* Identical flags must be compatible. */ - if (in_flags == out_flags) - return TRUE; - - /* Check to see if the input BFD actually contains any sections. If - not, its flags may not have been initialised either, but it - cannot actually cause any incompatibility. Do not short-circuit - dynamic objects; their section list may be emptied by - elf_link_add_object_symbols. - - Also check to see if there are no code sections in the input. - In this case there is no need to check for code specific flags. - XXX - do we need to worry about floating-point format compatability - in data sections ? */ - if (!(ibfd->flags & DYNAMIC)) - { - bfd_boolean null_input_bfd = TRUE; - bfd_boolean only_data_sections = TRUE; - - for (sec = ibfd->sections; sec != NULL; sec = sec->next) - { - /* Ignore synthetic glue sections. */ - if (strcmp (sec->name, ".glue_7") - && strcmp (sec->name, ".glue_7t")) - { - if ((bfd_get_section_flags (ibfd, sec) - & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) - == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS)) - only_data_sections = FALSE; - - null_input_bfd = FALSE; - break; - } - } - - if (null_input_bfd || only_data_sections) - return TRUE; - } - - /* Complain about various flag mismatches. */ - if (EF_ARM_EABI_VERSION (in_flags) != EF_ARM_EABI_VERSION (out_flags)) - { - _bfd_error_handler (_("\ -ERROR: %s is compiled for EABI version %d, whereas %s is compiled for version %d"), - bfd_archive_filename (ibfd), - (in_flags & EF_ARM_EABIMASK) >> 24, - bfd_get_filename (obfd), - (out_flags & EF_ARM_EABIMASK) >> 24); - return FALSE; - } - - /* Not sure what needs to be checked for EABI versions >= 1. */ - if (EF_ARM_EABI_VERSION (in_flags) == EF_ARM_EABI_UNKNOWN) - { - if ((in_flags & EF_ARM_APCS_26) != (out_flags & EF_ARM_APCS_26)) - { - _bfd_error_handler (_("\ -ERROR: %s is compiled for APCS-%d, whereas target %s uses APCS-%d"), - bfd_archive_filename (ibfd), - in_flags & EF_ARM_APCS_26 ? 26 : 32, - bfd_get_filename (obfd), - out_flags & EF_ARM_APCS_26 ? 26 : 32); - flags_compatible = FALSE; - } - - if ((in_flags & EF_ARM_APCS_FLOAT) != (out_flags & EF_ARM_APCS_FLOAT)) - { - if (in_flags & EF_ARM_APCS_FLOAT) - _bfd_error_handler (_("\ -ERROR: %s passes floats in float registers, whereas %s passes them in integer registers"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - else - _bfd_error_handler (_("\ -ERROR: %s passes floats in integer registers, whereas %s passes them in float registers"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - - flags_compatible = FALSE; - } - - if ((in_flags & EF_ARM_VFP_FLOAT) != (out_flags & EF_ARM_VFP_FLOAT)) - { - if (in_flags & EF_ARM_VFP_FLOAT) - _bfd_error_handler (_("\ -ERROR: %s uses VFP instructions, whereas %s does not"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - else - _bfd_error_handler (_("\ -ERROR: %s uses FPA instructions, whereas %s does not"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - - flags_compatible = FALSE; - } - - if ((in_flags & EF_ARM_MAVERICK_FLOAT) != (out_flags & EF_ARM_MAVERICK_FLOAT)) - { - if (in_flags & EF_ARM_MAVERICK_FLOAT) - _bfd_error_handler (_("\ -ERROR: %s uses Maverick instructions, whereas %s does not"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - else - _bfd_error_handler (_("\ -ERROR: %s does not use Maverick instructions, whereas %s does"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - - flags_compatible = FALSE; - } - -#ifdef EF_ARM_SOFT_FLOAT - if ((in_flags & EF_ARM_SOFT_FLOAT) != (out_flags & EF_ARM_SOFT_FLOAT)) - { - /* We can allow interworking between code that is VFP format - layout, and uses either soft float or integer regs for - passing floating point arguments and results. We already - know that the APCS_FLOAT flags match; similarly for VFP - flags. */ - if ((in_flags & EF_ARM_APCS_FLOAT) != 0 - || (in_flags & EF_ARM_VFP_FLOAT) == 0) - { - if (in_flags & EF_ARM_SOFT_FLOAT) - _bfd_error_handler (_("\ -ERROR: %s uses software FP, whereas %s uses hardware FP"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - else - _bfd_error_handler (_("\ -ERROR: %s uses hardware FP, whereas %s uses software FP"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - - flags_compatible = FALSE; - } - } -#endif - - /* Interworking mismatch is only a warning. */ - if ((in_flags & EF_ARM_INTERWORK) != (out_flags & EF_ARM_INTERWORK)) - { - if (in_flags & EF_ARM_INTERWORK) - { - _bfd_error_handler (_("\ -Warning: %s supports interworking, whereas %s does not"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - } - else - { - _bfd_error_handler (_("\ -Warning: %s does not support interworking, whereas %s does"), - bfd_archive_filename (ibfd), - bfd_get_filename (obfd)); - } - } - } - - return flags_compatible; -} - -/* Display the flags field. */ - -static bfd_boolean -elf32_arm_print_private_bfd_data (abfd, ptr) - bfd *abfd; - PTR ptr; -{ - FILE * file = (FILE *) ptr; - unsigned long flags; - - BFD_ASSERT (abfd != NULL && ptr != NULL); - - /* Print normal ELF private data. */ - _bfd_elf_print_private_bfd_data (abfd, ptr); - - flags = elf_elfheader (abfd)->e_flags; - /* Ignore init flag - it may not be set, despite the flags field - containing valid data. */ - - /* xgettext:c-format */ - fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); - - switch (EF_ARM_EABI_VERSION (flags)) - { - case EF_ARM_EABI_UNKNOWN: - /* The following flag bits are GNU extensions and not part of the - official ARM ELF extended ABI. Hence they are only decoded if - the EABI version is not set. */ - if (flags & EF_ARM_INTERWORK) - fprintf (file, _(" [interworking enabled]")); - - if (flags & EF_ARM_APCS_26) - fprintf (file, " [APCS-26]"); - else - fprintf (file, " [APCS-32]"); - - if (flags & EF_ARM_VFP_FLOAT) - fprintf (file, _(" [VFP float format]")); - else if (flags & EF_ARM_MAVERICK_FLOAT) - fprintf (file, _(" [Maverick float format]")); - else - fprintf (file, _(" [FPA float format]")); - - if (flags & EF_ARM_APCS_FLOAT) - fprintf (file, _(" [floats passed in float registers]")); - - if (flags & EF_ARM_PIC) - fprintf (file, _(" [position independent]")); - - if (flags & EF_ARM_NEW_ABI) - fprintf (file, _(" [new ABI]")); - - if (flags & EF_ARM_OLD_ABI) - fprintf (file, _(" [old ABI]")); - - if (flags & EF_ARM_SOFT_FLOAT) - fprintf (file, _(" [software FP]")); - - flags &= ~(EF_ARM_INTERWORK | EF_ARM_APCS_26 | EF_ARM_APCS_FLOAT - | EF_ARM_PIC | EF_ARM_NEW_ABI | EF_ARM_OLD_ABI - | EF_ARM_SOFT_FLOAT | EF_ARM_VFP_FLOAT - | EF_ARM_MAVERICK_FLOAT); - break; - - case EF_ARM_EABI_VER1: - fprintf (file, _(" [Version1 EABI]")); - - if (flags & EF_ARM_SYMSARESORTED) - fprintf (file, _(" [sorted symbol table]")); - else - fprintf (file, _(" [unsorted symbol table]")); - - flags &= ~ EF_ARM_SYMSARESORTED; - break; - - case EF_ARM_EABI_VER2: - fprintf (file, _(" [Version2 EABI]")); - - if (flags & EF_ARM_SYMSARESORTED) - fprintf (file, _(" [sorted symbol table]")); - else - fprintf (file, _(" [unsorted symbol table]")); - - if (flags & EF_ARM_DYNSYMSUSESEGIDX) - fprintf (file, _(" [dynamic symbols use segment index]")); - - if (flags & EF_ARM_MAPSYMSFIRST) - fprintf (file, _(" [mapping symbols precede others]")); - - flags &= ~(EF_ARM_SYMSARESORTED | EF_ARM_DYNSYMSUSESEGIDX - | EF_ARM_MAPSYMSFIRST); - break; - - default: - fprintf (file, _(" <EABI version unrecognised>")); - break; - } - - flags &= ~ EF_ARM_EABIMASK; - - if (flags & EF_ARM_RELEXEC) - fprintf (file, _(" [relocatable executable]")); - - if (flags & EF_ARM_HASENTRY) - fprintf (file, _(" [has entry point]")); - - flags &= ~ (EF_ARM_RELEXEC | EF_ARM_HASENTRY); - - if (flags) - fprintf (file, _("<Unrecognised flag bits set>")); - - fputc ('\n', file); - - return TRUE; -} - -static int -elf32_arm_get_symbol_type (elf_sym, type) - Elf_Internal_Sym * elf_sym; - int type; -{ - switch (ELF_ST_TYPE (elf_sym->st_info)) - { - case STT_ARM_TFUNC: - return ELF_ST_TYPE (elf_sym->st_info); - - case STT_ARM_16BIT: - /* If the symbol is not an object, return the STT_ARM_16BIT flag. - This allows us to distinguish between data used by Thumb instructions - and non-data (which is probably code) inside Thumb regions of an - executable. */ - if (type != STT_OBJECT) - return ELF_ST_TYPE (elf_sym->st_info); - break; - - default: - break; - } - - return type; -} - -static asection * -elf32_arm_gc_mark_hook (sec, info, rel, h, sym) - asection *sec; - struct bfd_link_info *info ATTRIBUTE_UNUSED; - Elf_Internal_Rela *rel; - struct elf_link_hash_entry *h; - Elf_Internal_Sym *sym; -{ - if (h != NULL) - { - switch (ELF32_R_TYPE (rel->r_info)) - { - case R_ARM_GNU_VTINHERIT: - case R_ARM_GNU_VTENTRY: - break; - - default: - switch (h->root.type) - { - case bfd_link_hash_defined: - case bfd_link_hash_defweak: - return h->root.u.def.section; - - case bfd_link_hash_common: - return h->root.u.c.p->section; - - default: - break; - } - } - } - else - return bfd_section_from_elf_index (sec->owner, sym->st_shndx); - - return NULL; -} - -/* Update the got entry reference counts for the section being removed. */ - -static bfd_boolean -elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) - bfd *abfd ATTRIBUTE_UNUSED; - struct bfd_link_info *info ATTRIBUTE_UNUSED; - asection *sec ATTRIBUTE_UNUSED; - const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; -{ - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - bfd_signed_vma *local_got_refcounts; - const Elf_Internal_Rela *rel, *relend; - unsigned long r_symndx; - struct elf_link_hash_entry *h; - - 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); - - relend = relocs + sec->reloc_count; - for (rel = relocs; rel < relend; rel++) - switch (ELF32_R_TYPE (rel->r_info)) - { - case R_ARM_GOT32: - r_symndx = ELF32_R_SYM (rel->r_info); - if (r_symndx >= symtab_hdr->sh_info) - { - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - 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; - - case R_ARM_ABS32: - case R_ARM_REL32: - case R_ARM_PC24: - case R_ARM_PLT32: - r_symndx = ELF32_R_SYM (rel->r_info); - if (r_symndx >= symtab_hdr->sh_info) - { - struct elf32_arm_link_hash_entry *eh; - struct elf32_arm_relocs_copied **pp; - struct elf32_arm_relocs_copied *p; - - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - - if (h->plt.refcount > 0) - h->plt.refcount -= 1; - - if (ELF32_R_TYPE (rel->r_info) == R_ARM_ABS32 - || ELF32_R_TYPE (rel->r_info) == R_ARM_REL32) - { - eh = (struct elf32_arm_link_hash_entry *) h; - - for (pp = &eh->relocs_copied; (p = *pp) != NULL; - pp = &p->next) - if (p->section == sec) - { - p->count -= 1; - if (p->count == 0) - *pp = p->next; - break; - } - } - } - break; - - default: - break; - } - - return TRUE; -} - -/* Look through the relocs for a section during the first phase. */ - -static bfd_boolean -elf32_arm_check_relocs (abfd, info, sec, relocs) - bfd *abfd; - struct bfd_link_info *info; - asection *sec; - const Elf_Internal_Rela *relocs; -{ - Elf_Internal_Shdr *symtab_hdr; - struct elf_link_hash_entry **sym_hashes; - struct elf_link_hash_entry **sym_hashes_end; - const Elf_Internal_Rela *rel; - const Elf_Internal_Rela *rel_end; - bfd *dynobj; - asection *sreloc; - bfd_vma *local_got_offsets; - struct elf32_arm_link_hash_table *htab; - - if (info->relocatable) - return TRUE; - - htab = elf32_arm_hash_table (info); - sreloc = NULL; - - dynobj = elf_hash_table (info)->dynobj; - local_got_offsets = elf_local_got_offsets (abfd); - - symtab_hdr = &elf_tdata (abfd)->symtab_hdr; - sym_hashes = elf_sym_hashes (abfd); - sym_hashes_end = sym_hashes - + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); - - if (!elf_bad_symtab (abfd)) - sym_hashes_end -= symtab_hdr->sh_info; - - rel_end = relocs + sec->reloc_count; - for (rel = relocs; rel < rel_end; rel++) - { - struct elf_link_hash_entry *h; - unsigned long r_symndx; - - r_symndx = ELF32_R_SYM (rel->r_info); - if (r_symndx < symtab_hdr->sh_info) - h = NULL; - else - h = sym_hashes[r_symndx - symtab_hdr->sh_info]; - - switch (ELF32_R_TYPE (rel->r_info)) - { - case R_ARM_GOT32: - /* This symbol requires a global offset table entry. */ - if (h != NULL) - { - h->got.refcount++; - } - 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(char)); - local_got_refcounts = ((bfd_signed_vma *) - 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; - } - break; - - case R_ARM_GOTOFF: - case R_ARM_GOTPC: - if (htab->sgot == NULL) - { - if (htab->root.dynobj == NULL) - htab->root.dynobj = abfd; - if (!create_got_section (htab->root.dynobj, info)) - return FALSE; - } - break; - - case R_ARM_ABS32: - case R_ARM_REL32: - case R_ARM_PC24: - case R_ARM_PLT32: - if (h != NULL) - { - /* 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. */ - if (!info->shared) - 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 different object. We can't tell for - sure yet, because something later might force the - symbol local. */ - if (ELF32_R_TYPE (rel->r_info) == R_ARM_PC24 - || ELF32_R_TYPE (rel->r_info) == R_ARM_PLT32) - h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; - - /* If we create a PLT entry, this relocation will reference - it, even if it's an ABS32 relocation. */ - 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 - 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). We account for that - possibility below by storing information in the - relocs_copied field of the hash table entry. */ - if (info->shared - && (sec->flags & SEC_ALLOC) != 0 - && ((ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 - && ELF32_R_TYPE (rel->r_info) != R_ARM_PLT32 - && ELF32_R_TYPE (rel->r_info) != R_ARM_REL32) - || (h != NULL - && (! info->symbolic - || (h->elf_link_hash_flags - & ELF_LINK_HASH_DEF_REGULAR) == 0)))) - { - struct elf32_arm_relocs_copied *p, **head; - - /* 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. */ - if (sreloc == NULL) - { - const char * name; - - name = (bfd_elf_string_from_elf_section - (abfd, - elf_elfheader (abfd)->e_shstrndx, - elf_section_data (sec)->rel_hdr.sh_name)); - if (name == NULL) - return FALSE; - - BFD_ASSERT (strncmp (name, ".rel", 4) == 0 - && strcmp (bfd_get_section_name (abfd, sec), - name + 4) == 0); - - sreloc = bfd_get_section_by_name (dynobj, name); - if (sreloc == NULL) - { - flagword flags; - - sreloc = bfd_make_section (dynobj, name); - flags = (SEC_HAS_CONTENTS | SEC_READONLY - | SEC_IN_MEMORY | SEC_LINKER_CREATED); - if ((sec->flags & SEC_ALLOC) != 0) - flags |= SEC_ALLOC | SEC_LOAD; - if (sreloc == NULL - || ! bfd_set_section_flags (dynobj, sreloc, flags) - || ! bfd_set_section_alignment (dynobj, sreloc, 2)) - return FALSE; - } - - elf_section_data (sec)->sreloc = sreloc; - } - - /* If this is a global symbol, we count the number of - relocations we need for this symbol. */ - if (h != NULL) - { - head = &((struct elf32_arm_link_hash_entry *) h)->relocs_copied; - } - 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; - - head = ((struct elf32_arm_relocs_copied **) - &elf_section_data (s)->local_dynrel); - } - - p = *head; - if (p == NULL || p->section != sec) - { - bfd_size_type amt = sizeof *p; - p = bfd_alloc (htab->root.dynobj, amt); - if (p == NULL) - return FALSE; - p->next = *head; - *head = p; - p->section = sec; - p->count = 0; - } - - if (ELF32_R_TYPE (rel->r_info) == R_ARM_ABS32 - || ELF32_R_TYPE (rel->r_info) == R_ARM_REL32) - p->count += 1; - } - break; - - /* This relocation describes the C++ object vtable hierarchy. - Reconstruct it for later use during GC. */ - case R_ARM_GNU_VTINHERIT: - if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) - return FALSE; - break; - - /* This relocation describes which C++ vtable entries are actually - used. Record for later use during GC. */ - case R_ARM_GNU_VTENTRY: - if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset)) - return FALSE; - break; - } - } - - return TRUE; -} - -/* Find the nearest line to a particular section and offset, for error - reporting. This code is a duplicate of the code in elf.c, except - that it also accepts STT_ARM_TFUNC as a symbol that names a function. */ - -static bfd_boolean -elf32_arm_find_nearest_line - (abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr) - bfd *abfd; - asection *section; - asymbol **symbols; - bfd_vma offset; - const char **filename_ptr; - const char **functionname_ptr; - unsigned int *line_ptr; -{ - bfd_boolean found; - const char *filename; - asymbol *func; - bfd_vma low_func; - asymbol **p; - - if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset, - filename_ptr, functionname_ptr, - line_ptr, 0, - &elf_tdata (abfd)->dwarf2_find_line_info)) - return TRUE; - - if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, - &found, filename_ptr, - functionname_ptr, line_ptr, - &elf_tdata (abfd)->line_info)) - return FALSE; - - if (found) - return TRUE; - - if (symbols == NULL) - return FALSE; - - filename = NULL; - func = NULL; - low_func = 0; - - for (p = symbols; *p != NULL; p++) - { - elf_symbol_type *q; - - q = (elf_symbol_type *) *p; - - if (bfd_get_section (&q->symbol) != section) - continue; - - switch (ELF_ST_TYPE (q->internal_elf_sym.st_info)) - { - default: - break; - case STT_FILE: - filename = bfd_asymbol_name (&q->symbol); - break; - case STT_NOTYPE: - case STT_FUNC: - case STT_ARM_TFUNC: - if (q->symbol.section == section - && q->symbol.value >= low_func - && q->symbol.value <= offset) - { - func = (asymbol *) q; - low_func = q->symbol.value; - } - break; - } - } - - if (func == NULL) - return FALSE; - - *filename_ptr = filename; - *functionname_ptr = bfd_asymbol_name (func); - *line_ptr = 0; - - 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_arm_adjust_dynamic_symbol (info, h) - struct bfd_link_info * info; - struct elf_link_hash_entry * h; -{ - bfd * dynobj; - 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 (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 PC24 reloc instead. */ - h->plt.offset = (bfd_vma) -1; - h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT; - } - - return TRUE; - } - else - /* It's possible that we incorrectly decided a .plt reloc was - needed for an R_ARM_PC24 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 - processor independent code will have arranged for us to see the - real definition first, and we can just use the same value. */ - if (h->weakdef != NULL) - { - BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined - || h->weakdef->root.type == bfd_link_hash_defweak); - h->root.u.def.section = h->weakdef->root.u.def.section; - h->root.u.def.value = h->weakdef->root.u.def.value; - return TRUE; - } - - /* This is a reference to a symbol defined by a dynamic object which - is not a function. */ - - /* If we are creating a shared library, we must presume that the - only references to the symbol are via the global offset table. - For such cases we need not do anything here; the relocations will - be handled correctly by relocate_section. */ - if (info->shared) - return TRUE; - - /* We must allocate the symbol in our .dynbss section, which will - become part of the .bss section of the executable. There will be - an entry for this symbol in the .dynsym section. The dynamic - object will contain position independent code, so all references - from the dynamic object to this symbol will go through the global - offset table. The dynamic linker will use the .dynsym entry to - determine the address it must put in the global offset table, so - both the dynamic object and the regular object will refer to the - same memory location for the variable. */ - s = bfd_get_section_by_name (dynobj, ".dynbss"); - BFD_ASSERT (s != NULL); - - /* We must generate a R_ARM_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 - .rel.bss section we are going to use. */ - if ((h->root.u.def.section->flags & SEC_ALLOC) != 0) - { - asection *srel; - - srel = bfd_get_section_by_name (dynobj, ".rel.bss"); - BFD_ASSERT (srel != NULL); - srel->_raw_size += sizeof (Elf32_External_Rel); - h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY; - } - - /* We need to figure out the alignment required for this symbol. I - have no idea how ELF linkers handle this. */ - power_of_two = bfd_log2 (h->size); - if (power_of_two > 3) - power_of_two = 3; - - /* Apply the required alignment. */ - 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 (! bfd_set_section_alignment (dynobj, s, power_of_two)) - return FALSE; - } - - /* Define the symbol as being at this point in the section. */ - h->root.u.def.section = s; - h->root.u.def.value = s->_raw_size; - - /* Increment the section size to make room for the symbol. */ - s->_raw_size += h->size; - - return TRUE; -} - -/* Allocate space in .plt, .got and associated reloc sections for - dynamic relocs. */ - -static bfd_boolean -allocate_dynrelocs (h, inf) - struct elf_link_hash_entry *h; - PTR inf; -{ - struct bfd_link_info *info; - struct elf32_arm_link_hash_table *htab; - struct elf32_arm_link_hash_entry *eh; - struct elf32_arm_relocs_copied *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; - - info = (struct bfd_link_info *) inf; - htab = elf32_arm_hash_table (info); - - if (htab->root.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_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - if (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, 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_HEADER_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 += 4; - - /* We also need to make an entry in the .rel.plt section. */ - htab->srelplt->_raw_size += sizeof (Elf32_External_Rel); - } - 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; - bfd_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_elf_link_record_dynamic_symbol (info, h)) - return FALSE; - } - - s = htab->sgot; - h->got.offset = s->_raw_size; - s->_raw_size += 4; - dyn = htab->root.dynamic_sections_created; - if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT - || h->root.type != bfd_link_hash_undefweak) - && (info->shared - || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h))) - htab->srelgot->_raw_size += sizeof (Elf32_External_Rel); - } - else - h->got.offset = (bfd_vma) -1; - - eh = (struct elf32_arm_link_hash_entry *) h; - if (eh->relocs_copied == 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) - { - /* Discard relocs on undefined weak syms with non-default - visibility. */ - if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT - && h->root.type == bfd_link_hash_undefweak) - eh->relocs_copied = NULL; - } - 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->root.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_elf_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->relocs_copied = NULL; - - keep: ; - } - - /* Finally, allocate space. */ - for (p = eh->relocs_copied; p != NULL; p = p->next) - { - asection *sreloc = elf_section_data (p->section)->sreloc; - sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel); - } - - return TRUE; -} - -/* Set the sizes of the dynamic sections. */ - -static bfd_boolean -elf32_arm_size_dynamic_sections (output_bfd, info) - bfd * output_bfd ATTRIBUTE_UNUSED; - struct bfd_link_info * info; -{ - bfd * dynobj; - asection * s; - bfd_boolean plt; - bfd_boolean relocs; - bfd *ibfd; - struct elf32_arm_link_hash_table *htab; - - htab = elf32_arm_hash_table (info); - dynobj = elf_hash_table (info)->dynobj; - BFD_ASSERT (dynobj != NULL); - - if (elf_hash_table (info)->dynamic_sections_created) - { - /* Set the contents of the .interp section to the interpreter. */ - if (info->executable) - { - s = bfd_get_section_by_name (dynobj, ".interp"); - BFD_ASSERT (s != NULL); - s->_raw_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_size_type locsymcount; - Elf_Internal_Shdr *symtab_hdr; - asection *srel; - - if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour) - continue; - - for (s = ibfd->sections; s != NULL; s = s->next) - { - struct elf32_arm_relocs_copied *p; - - for (p = *((struct elf32_arm_relocs_copied **) - &elf_section_data (s)->local_dynrel); - p != NULL; - p = p->next) - { - if (!bfd_is_abs_section (p->section) - && bfd_is_abs_section (p->section->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->section)->sreloc; - srel->_raw_size += p->count * sizeof (Elf32_External_Rel); - if ((p->section->output_section->flags & SEC_READONLY) != 0) - info->flags |= DF_TEXTREL; - } - } - } - - 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, ++local_tls_type) - { - if (*local_got > 0) - { - *local_got = s->_raw_size; - s->_raw_size += 4; - if (info->shared) - srel->_raw_size += sizeof (Elf32_External_Rel); - } - 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->root, allocate_dynrelocs, (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 = FALSE; - relocs = FALSE; - for (s = dynobj->sections; s != NULL; s = s->next) - { - const char * name; - bfd_boolean strip; - - if ((s->flags & SEC_LINKER_CREATED) == 0) - continue; - - /* It's OK to base decisions on the section name, because none - of the dynobj section names depend upon the input files. */ - name = bfd_get_section_name (dynobj, s); - - strip = FALSE; - - if (strcmp (name, ".plt") == 0) - { - if (s->_raw_size == 0) - { - /* Strip this section if we don't need it; see the - comment below. */ - strip = TRUE; - } - else - { - /* Remember whether there is a PLT. */ - plt = TRUE; - } - } - else if (strncmp (name, ".rel", 4) == 0) - { - if (s->_raw_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. */ - strip = TRUE; - } - else - { - /* Remember whether there are any reloc sections other - than .rel.plt. */ - if (strcmp (name, ".rel.plt") != 0) - 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) - { - /* It's not one of our sections, so don't allocate space. */ - continue; - } - - if (strip) - { - _bfd_strip_section_from_output (info, s); - continue; - } - - /* Allocate memory for the section contents. */ - s->contents = (bfd_byte *) bfd_zalloc (dynobj, s->_raw_size); - if (s->contents == NULL && s->_raw_size != 0) - return FALSE; - } - - if (elf_hash_table (info)->dynamic_sections_created) - { - /* Add some entries to the .dynamic section. We fill in the - values later, in elf32_arm_finish_dynamic_sections, but we - must add the entries now so that we get the correct size for - the .dynamic section. The DT_DEBUG entry is filled in by the - dynamic linker and used by the debugger. */ -#define add_dynamic_entry(TAG, VAL) \ - _bfd_elf_add_dynamic_entry (info, TAG, VAL) - - if (!info->shared) - { - if (!add_dynamic_entry (DT_DEBUG, 0)) - return FALSE; - } - - if (plt) - { - if ( !add_dynamic_entry (DT_PLTGOT, 0) - || !add_dynamic_entry (DT_PLTRELSZ, 0) - || !add_dynamic_entry (DT_PLTREL, DT_REL) - || !add_dynamic_entry (DT_JMPREL, 0)) - return FALSE; - } - - if (relocs) - { - if ( !add_dynamic_entry (DT_REL, 0) - || !add_dynamic_entry (DT_RELSZ, 0) - || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel))) - return FALSE; - } - - if ((info->flags & DF_TEXTREL) != 0) - { - if (!add_dynamic_entry (DT_TEXTREL, 0)) - return FALSE; - info->flags |= DF_TEXTREL; - } - } -#undef add_synamic_entry - - return TRUE; -} - -/* Finish up dynamic symbol handling. We set the contents of various - dynamic sections here. */ - -static bfd_boolean -elf32_arm_finish_dynamic_symbol (output_bfd, info, h, sym) - bfd * output_bfd; - struct bfd_link_info * info; - struct elf_link_hash_entry * h; - Elf_Internal_Sym * sym; -{ - bfd * dynobj; - - dynobj = elf_hash_table (info)->dynobj; - - if (h->plt.offset != (bfd_vma) -1) - { - asection * splt; - asection * sgot; - asection * srel; - bfd_vma plt_index; - bfd_vma got_offset; - Elf_Internal_Rela rel; - bfd_byte *loc; - bfd_vma got_displacement; - - /* 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"); - srel = bfd_get_section_by_name (dynobj, ".rel.plt"); - BFD_ASSERT (splt != NULL && sgot != NULL && srel != NULL); - - /* 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. */ - plt_index = (h->plt.offset - PLT_HEADER_SIZE) / PLT_ENTRY_SIZE; - - /* 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. */ - got_offset = (plt_index + 3) * 4; - - /* Calculate the displacement between the PLT slot and the - entry in the GOT. */ - got_displacement = (sgot->output_section->vma - + sgot->output_offset - + got_offset - - splt->output_section->vma - - splt->output_offset - - h->plt.offset - - 8); - - BFD_ASSERT ((got_displacement & 0xf0000000) == 0); - - /* Fill in the entry in the procedure linkage table. */ - bfd_put_32 (output_bfd, elf32_arm_plt_entry[0] | ((got_displacement & 0x0ff00000) >> 20), - splt->contents + h->plt.offset + 0); - bfd_put_32 (output_bfd, elf32_arm_plt_entry[1] | ((got_displacement & 0x000ff000) >> 12), - splt->contents + h->plt.offset + 4); - bfd_put_32 (output_bfd, elf32_arm_plt_entry[2] | (got_displacement & 0x00000fff), - splt->contents + h->plt.offset + 8); -#ifdef FOUR_WORD_PLT - bfd_put_32 (output_bfd, elf32_arm_plt_entry[3], - splt->contents + h->plt.offset + 12); -#endif - - /* Fill in the entry in the global offset table. */ - bfd_put_32 (output_bfd, - (splt->output_section->vma - + splt->output_offset), - sgot->contents + got_offset); - - /* Fill in the entry in the .rel.plt section. */ - rel.r_offset = (sgot->output_section->vma - + sgot->output_offset - + got_offset); - rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_JUMP_SLOT); - loc = srel->contents + plt_index * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &rel, 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. */ - 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 * srel; - Elf_Internal_Rela rel; - bfd_byte *loc; - - /* This symbol has an entry in the global offset table. Set it - up. */ - sgot = bfd_get_section_by_name (dynobj, ".got"); - srel = bfd_get_section_by_name (dynobj, ".rel.got"); - BFD_ASSERT (sgot != NULL && srel != NULL); - - rel.r_offset = (sgot->output_section->vma - + sgot->output_offset - + (h->got.offset &~ (bfd_vma) 1)); - - /* If this is a static link, or it is a -Bsymbolic link and the - symbol is defined locally or was forced to be local because - 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 (info->shared - && SYMBOL_REFERENCES_LOCAL (info, h)) - { - BFD_ASSERT((h->got.offset & 1) != 0); - rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); - } - else - { - BFD_ASSERT((h->got.offset & 1) == 0); - bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + h->got.offset); - rel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_GLOB_DAT); - } - - loc = srel->contents + srel->reloc_count++ * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); - } - - if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) - { - asection * s; - Elf_Internal_Rela rel; - bfd_byte *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, - ".rel.bss"); - BFD_ASSERT (s != NULL); - - 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_ARM_COPY); - loc = s->contents + s->reloc_count++ * sizeof (Elf32_External_Rel); - bfd_elf32_swap_reloc_out (output_bfd, &rel, loc); - } - - /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */ - if (strcmp (h->root.root.string, "_DYNAMIC") == 0 - || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0) - sym->st_shndx = SHN_ABS; - - return TRUE; -} - -/* Finish up the dynamic sections. */ - -static bfd_boolean -elf32_arm_finish_dynamic_sections (output_bfd, info) - bfd * output_bfd; - struct bfd_link_info * info; -{ - bfd * dynobj; - asection * sgot; - asection * sdyn; - - dynobj = elf_hash_table (info)->dynobj; - - sgot = bfd_get_section_by_name (dynobj, ".got.plt"); - BFD_ASSERT (sgot != NULL); - sdyn = bfd_get_section_by_name (dynobj, ".dynamic"); - - if (elf_hash_table (info)->dynamic_sections_created) - { - asection *splt; - Elf32_External_Dyn *dyncon, *dynconend; - - splt = bfd_get_section_by_name (dynobj, ".plt"); - BFD_ASSERT (splt != NULL && sdyn != NULL); - - dyncon = (Elf32_External_Dyn *) sdyn->contents; - dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size); - - for (; dyncon < dynconend; dyncon++) - { - Elf_Internal_Dyn dyn; - const char * name; - asection * s; - - bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn); - - switch (dyn.d_tag) - { - default: - break; - - case DT_PLTGOT: - name = ".got"; - goto get_vma; - case DT_JMPREL: - name = ".rel.plt"; - get_vma: - s = bfd_get_section_by_name (output_bfd, name); - BFD_ASSERT (s != NULL); - dyn.d_un.d_ptr = s->vma; - bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); - break; - - case DT_PLTRELSZ: - s = bfd_get_section_by_name (output_bfd, ".rel.plt"); - BFD_ASSERT (s != NULL); - if (s->_cooked_size != 0) - dyn.d_un.d_val = s->_cooked_size; - else - dyn.d_un.d_val = s->_raw_size; - bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); - break; - - case DT_RELSZ: - /* My reading of the SVR4 ABI indicates that the - procedure linkage table relocs (DT_JMPREL) should be - included in the overall relocs (DT_REL). This is - what Solaris does. However, UnixWare can not handle - that case. Therefore, we override the DT_RELSZ entry - here to make it not include the JMPREL relocs. Since - the linker script arranges for .rel.plt to follow all - other relocation sections, we don't have to worry - about changing the DT_REL entry. */ - s = bfd_get_section_by_name (output_bfd, ".rel.plt"); - if (s != NULL) - { - if (s->_cooked_size != 0) - dyn.d_un.d_val -= s->_cooked_size; - else - dyn.d_un.d_val -= s->_raw_size; - } - bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); - break; - - /* Set the bottom bit of DT_INIT/FINI if the - corresponding function is Thumb. */ - case DT_INIT: - name = info->init_function; - goto get_sym; - case DT_FINI: - name = info->fini_function; - get_sym: - /* If it wasn't set by elf_bfd_final_link - then there is nothing to adjust. */ - if (dyn.d_un.d_val != 0) - { - struct elf_link_hash_entry * eh; - - eh = elf_link_hash_lookup (elf_hash_table (info), name, - FALSE, FALSE, TRUE); - if (eh != (struct elf_link_hash_entry *) NULL - && ELF_ST_TYPE (eh->type) == STT_ARM_TFUNC) - { - dyn.d_un.d_val |= 1; - bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon); - } - } - break; - } - } - - /* Fill in the first entry in the procedure linkage table. */ - if (splt->_raw_size > 0) - { - bfd_vma got_displacement; - - /* Calculate the displacement between the PLT slot and &GOT[0]. */ - got_displacement = (sgot->output_section->vma - + sgot->output_offset - - splt->output_section->vma - - splt->output_offset - - 16); - - bfd_put_32 (output_bfd, elf32_arm_plt0_entry[0], splt->contents + 0); - bfd_put_32 (output_bfd, elf32_arm_plt0_entry[1], splt->contents + 4); - bfd_put_32 (output_bfd, elf32_arm_plt0_entry[2], splt->contents + 8); - bfd_put_32 (output_bfd, elf32_arm_plt0_entry[3], splt->contents + 12); -#ifdef FOUR_WORD_PLT - /* The displacement value goes in the otherwise-unused last word of - the second entry. */ - bfd_put_32 (output_bfd, got_displacement, splt->contents + 28); -#else - bfd_put_32 (output_bfd, got_displacement, splt->contents + 16); -#endif - } - - /* UnixWare sets the entsize of .plt to 4, although that doesn't - really seem like the right value. */ - elf_section_data (splt->output_section)->this_hdr.sh_entsize = 4; - } - - /* Fill in the first three entries in the global offset table. */ - if (sgot->_raw_size > 0) - { - if (sdyn == NULL) - bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents); - else - bfd_put_32 (output_bfd, - sdyn->output_section->vma + sdyn->output_offset, - sgot->contents); - bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4); - bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8); - } - - elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4; - - return TRUE; -} - -static void -elf32_arm_post_process_headers (abfd, link_info) - bfd * abfd; - struct bfd_link_info * link_info ATTRIBUTE_UNUSED; -{ - Elf_Internal_Ehdr * i_ehdrp; /* ELF file header, internal form. */ - - i_ehdrp = elf_elfheader (abfd); - - i_ehdrp->e_ident[EI_OSABI] = ARM_ELF_OS_ABI_VERSION; - i_ehdrp->e_ident[EI_ABIVERSION] = ARM_ELF_ABI_VERSION; -} - -static enum elf_reloc_type_class -elf32_arm_reloc_type_class (rela) - const Elf_Internal_Rela *rela; -{ - switch ((int) ELF32_R_TYPE (rela->r_info)) - { - case R_ARM_RELATIVE: - return reloc_class_relative; - case R_ARM_JUMP_SLOT: - return reloc_class_plt; - case R_ARM_COPY: - return reloc_class_copy; - default: - return reloc_class_normal; - } -} - -static bfd_boolean elf32_arm_section_flags PARAMS ((flagword *, Elf_Internal_Shdr *)); -static void elf32_arm_final_write_processing PARAMS ((bfd *, bfd_boolean)); - -/* Set the right machine number for an Arm ELF file. */ - -static bfd_boolean -elf32_arm_section_flags (flags, hdr) - flagword *flags; - Elf_Internal_Shdr *hdr; -{ - if (hdr->sh_type == SHT_NOTE) - *flags |= SEC_LINK_ONCE | SEC_LINK_DUPLICATES_SAME_CONTENTS; - - return TRUE; -} - -void -elf32_arm_final_write_processing (abfd, linker) - bfd *abfd; - bfd_boolean linker ATTRIBUTE_UNUSED; -{ - bfd_arm_update_notes (abfd, ARM_NOTE_SECTION); -} - -#define ELF_ARCH bfd_arch_arm -#define ELF_MACHINE_CODE EM_ARM -#ifdef __QNXTARGET__ -#define ELF_MAXPAGESIZE 0x1000 -#else -#define ELF_MAXPAGESIZE 0x8000 -#endif - -#define bfd_elf32_bfd_copy_private_bfd_data elf32_arm_copy_private_bfd_data -#define bfd_elf32_bfd_merge_private_bfd_data elf32_arm_merge_private_bfd_data -#define bfd_elf32_bfd_set_private_flags elf32_arm_set_private_flags -#define bfd_elf32_bfd_print_private_bfd_data elf32_arm_print_private_bfd_data -#define bfd_elf32_bfd_link_hash_table_create elf32_arm_link_hash_table_create -#define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup -#define bfd_elf32_find_nearest_line elf32_arm_find_nearest_line - -#define elf_backend_get_symbol_type elf32_arm_get_symbol_type -#define elf_backend_gc_mark_hook elf32_arm_gc_mark_hook -#define elf_backend_gc_sweep_hook elf32_arm_gc_sweep_hook -#define elf_backend_check_relocs elf32_arm_check_relocs -#define elf_backend_relocate_section elf32_arm_relocate_section -#define elf_backend_adjust_dynamic_symbol elf32_arm_adjust_dynamic_symbol -#define elf_backend_create_dynamic_sections elf32_arm_create_dynamic_sections -#define elf_backend_finish_dynamic_symbol elf32_arm_finish_dynamic_symbol -#define elf_backend_finish_dynamic_sections elf32_arm_finish_dynamic_sections -#define elf_backend_size_dynamic_sections elf32_arm_size_dynamic_sections -#define elf_backend_post_process_headers elf32_arm_post_process_headers -#define elf_backend_reloc_type_class elf32_arm_reloc_type_class -#define elf_backend_object_p elf32_arm_object_p -#define elf_backend_section_flags elf32_arm_section_flags -#define elf_backend_final_write_processing elf32_arm_final_write_processing -#define elf_backend_copy_indirect_symbol elf32_arm_copy_indirect_symbol - -#define elf_backend_can_refcount 1 -#define elf_backend_can_gc_sections 1 -#define elf_backend_plt_readonly 1 -#define elf_backend_want_got_plt 1 -#define elf_backend_want_plt_sym 0 -#if !USE_REL -#define elf_backend_rela_normal 1 -#endif - -#define elf_backend_got_header_size 12 - -#include "elf32-target.h" - |