diff options
Diffstat (limited to 'x/binutils/bfd/elf32-arm.h')
| -rw-r--r-- | x/binutils/bfd/elf32-arm.h | 4108 |
1 files changed, 4108 insertions, 0 deletions
diff --git a/x/binutils/bfd/elf32-arm.h b/x/binutils/bfd/elf32-arm.h new file mode 100644 index 0000000..8c1acc0 --- /dev/null +++ b/x/binutils/bfd/elf32-arm.h @@ -0,0 +1,4108 @@ +/* 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" + |
