diff options
Diffstat (limited to 'bfd/elf32-arm.h')
| -rw-r--r-- | bfd/elf32-arm.h | 3010 |
1 files changed, 3010 insertions, 0 deletions
diff --git a/bfd/elf32-arm.h b/bfd/elf32-arm.h new file mode 100644 index 00000000000..d4e97d6b9bf --- /dev/null +++ b/bfd/elf32-arm.h @@ -0,0 +1,3010 @@ +/* 32-bit ELF support for ARM + Copyright 1998, 1999 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. */ + + +typedef unsigned long int insn32; +typedef unsigned short int insn16; + +static boolean elf32_arm_set_private_flags + PARAMS ((bfd *, flagword)); +static boolean elf32_arm_copy_private_bfd_data + PARAMS ((bfd *, bfd *)); +static boolean elf32_arm_merge_private_bfd_data + PARAMS ((bfd *, bfd *)); +static 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 *, unsigned char)); + +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 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 *)); + +/* 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 INTERWORK_FLAG( abfd ) (elf_elfheader (abfd)->e_flags & EF_INTERWORK) + +#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" + +/* 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 calles the dynamic + linker first */ + +static const bfd_byte elf32_arm_plt0_entry [PLT_ENTRY_SIZE] = +{ + 0x04, 0xe0, 0x2d, 0xe5, /* str lr, [sp, #-4]! */ + 0x10, 0xe0, 0x9f, 0xe5, /* ldr lr, [pc, #16] */ + 0x0e, 0xe0, 0x8f, 0xe0, /* adr lr, pc, lr */ + 0x08, 0xf0, 0xbe, 0xe5 /* ldr pc, [lr, #-4] */ +}; + +/* Subsequent entries in a procedure linkage table look like + this. */ + +static const bfd_byte elf32_arm_plt_entry [PLT_ENTRY_SIZE] = +{ + 0x04, 0xc0, 0x9f, 0xe5, /* ldr ip, [pc, #4] */ + 0x0c, 0xc0, 0x8f, 0xe0, /* add ip, pc, ip */ + 0x00, 0xf0, 0x9c, 0xe5, /* ldr pc, [ip] */ + 0x00, 0x00, 0x00, 0x00 /* offset to symbol in got */ +}; + + +/* 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_pcrel_relocs_copied +{ + /* Next section. */ + struct elf32_arm_pcrel_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_pcrel_relocs_copied * pcrel_relocs_copied; +}; + +/* Declare this now that the above structures are defined. */ + +static boolean elf32_arm_discard_copies + PARAMS ((struct elf32_arm_link_hash_entry *, PTR)); + +/* Traverse an arm ELF linker hash table. */ + +#define elf32_arm_link_hash_traverse(table, func, info) \ + (elf_link_hash_traverse \ + (&(table)->root, \ + (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 containg the Thumb-to-ARM glue. */ + long int thumb_glue_size; + + /* The size in bytes of the section containg the ARM-to-Thumb glue. */ + long int arm_glue_size; + + /* An arbitary input BFD chosen to hold the glue sections. */ + bfd * bfd_of_glue_owner; + }; + + +/* 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; + + ret = ((struct elf32_arm_link_hash_table *) + bfd_alloc (abfd, sizeof (struct elf32_arm_link_hash_table))); + if (ret == (struct elf32_arm_link_hash_table *) NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, + _bfd_elf_link_hash_newfunc)) + { + bfd_release (abfd, ret); + return NULL; + } + + ret->thumb_glue_size = 0; + ret->arm_glue_size = 0; + ret->bfd_of_glue_owner = NULL; + + return &ret->root.root; +} + +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 (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_get_filename (input_bfd), tmp_name, name); + + free (tmp_name); + + return hash; +} + +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 (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_get_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; + +static const insn16 t2a1_push_insn = 0xb540; +static const insn16 t2a2_ldr_insn = 0x4e03; +static const insn16 t2a3_mov_insn = 0x46fe; +static const insn16 t2a4_bx_insn = 0x4730; +static const insn32 t2a5_pop_insn = 0xe8bd4040; +static const insn32 t2a6_bx_insn = 0xe12fff1e; + +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; + register asection * s; + char * tmp_name; + struct elf_link_hash_entry * myh; + struct elf32_arm_link_hash_table * globals; + + 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 (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) + { + free (tmp_name); + return; /* we've already seen this guy */ + } + + /* 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. */ + + _bfd_generic_link_add_one_symbol (link_info, globals->bfd_of_glue_owner, tmp_name, + BSF_GLOBAL, + s, globals->arm_glue_size + 1, + NULL, true, false, + (struct bfd_link_hash_entry **) &myh); + + 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; + register asection *s; + char *tmp_name; + struct elf_link_hash_entry *myh; + struct elf32_arm_link_hash_table *hash_table; + char bind; + + 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 (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) + { + free (tmp_name); + return; /* we've already seen this guy */ + } + + _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, + BSF_GLOBAL, s, hash_table->thumb_glue_size + 1, + NULL, true, false, + (struct bfd_link_hash_entry **) &myh); + + /* If we mark it 'thumb', the disassembler will do a better job. */ + bind = ELF_ST_BIND (myh->type); + myh->type = ELF_ST_INFO (bind, STT_ARM_TFUNC); + + free (tmp_name); + + /* Allocate another symbol to mark where we switch to arm mode. */ + +#define CHANGE_TO_ARM "__%s_change_to_arm" +#define BACK_FROM_ARM "__%s_back_from_arm" + + tmp_name = (char *) bfd_malloc (strlen (name) + strlen (CHANGE_TO_ARM) + 1); + + BFD_ASSERT (tmp_name); + + sprintf (tmp_name, CHANGE_TO_ARM, name); + + myh = NULL; + + _bfd_generic_link_add_one_symbol (link_info, hash_table->bfd_of_glue_owner, tmp_name, + BSF_LOCAL, s, hash_table->thumb_glue_size + 4, + NULL, true, false, + (struct bfd_link_hash_entry **) &myh); + + free (tmp_name); + + hash_table->thumb_glue_size += THUMB2ARM_GLUE_SIZE; + + return; +} + +/* 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 */ +boolean +bfd_elf32_arm_get_bfd_for_interworking (abfd, info) + bfd *abfd; + struct bfd_link_info *info; +{ + struct elf32_arm_link_hash_table *globals; + flagword flags; + asection *sec; + + /* If we are only performing a partial link do not bother + getting a bfd to hold the glue. */ + if (info->relocateable) + return true; + + globals = elf32_arm_hash_table (info); + + BFD_ASSERT (globals != NULL); + + if (globals->bfd_of_glue_owner != NULL) + return true; + + sec = bfd_get_section_by_name (abfd, ARM2THUMB_GLUE_SECTION_NAME); + + if (sec == NULL) + { + flags = SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY; + + 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; + } + + 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 = 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; + } + + /* Save the bfd for later use. */ + globals->bfd_of_glue_owner = abfd; + + return true; +} + +boolean +bfd_elf32_arm_process_before_allocation (abfd, link_info) + bfd *abfd; + struct bfd_link_info *link_info; +{ + Elf_Internal_Shdr *symtab_hdr; + Elf_Internal_Rela *free_relocs = NULL; + Elf_Internal_Rela *irel, *irelend; + bfd_byte *contents = NULL; + bfd_byte *free_contents = NULL; + Elf32_External_Sym *extsyms = NULL; + Elf32_External_Sym *free_extsyms = 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->relocateable) + 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); + + /* 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. */ + + irel = (_bfd_elf32_link_read_relocs (abfd, sec, (PTR) NULL, + (Elf_Internal_Rela *) NULL, false)); + + BFD_ASSERT (irel != 0); + + irelend = irel + sec->reloc_count; + for (; irel < irelend; irel++) + { + long r_type; + unsigned long r_index; + unsigned char code; + + 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; + free_contents = contents; + + if (!bfd_get_section_contents (abfd, sec, contents, + (file_ptr) 0, sec->_raw_size)) + goto error_return; + } + } + + /* Read this BFD's symbols if we haven't done so already. */ + if (extsyms == NULL) + { + /* Get cached copy if it exists. */ + if (symtab_hdr->contents != NULL) + extsyms = (Elf32_External_Sym *) symtab_hdr->contents; + else + { + /* Go get them off disk. */ + extsyms = ((Elf32_External_Sym *) + bfd_malloc (symtab_hdr->sh_size)); + if (extsyms == NULL) + goto error_return; + free_extsyms = extsyms; + if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0 + || (bfd_read (extsyms, 1, symtab_hdr->sh_size, abfd) + != symtab_hdr->sh_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; + } + } + } + + return true; +error_return: + if (free_relocs != NULL) + free (free_relocs); + if (free_contents != NULL) + free (free_contents); + if (free_extsyms != NULL) + free (free_extsyms); + return false; + +} + +/* 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 (identifed 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 + abort (); /* error - not a valid branch instruction form */ + + /* FIXME: abort is probably not the right call. krk@cygnus.com */ + + 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; + char *name; + bfd *input_bfd; + bfd *output_bfd; + asection *input_section; + bfd_byte *hit_data; + asection *sym_sec; + int offset; + int addend; + bfd_vma val; +{ + asection *s = 0; + long int 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_get_filename (sym_sec->owner), name); + _bfd_error_handler + (_ (" first occurrence: %s: thumb call to arm"), + bfd_get_filename (input_bfd)); + + return false; + } + + --my_offset; + myh->root.u.def.value = my_offset; + + bfd_put_16 (output_bfd, t2a1_bx_pc_insn, + s->contents + my_offset); + + bfd_put_16 (output_bfd, t2a2_noop_insn, + s->contents + my_offset + 2); + + ret_offset = + ((bfd_signed_vma) val) /* Address of destination of the stub */ + - ((bfd_signed_vma) + (s->output_offset /* Offset from the start of the current section to the start of the stubs. */ + + my_offset /* Offset of the start of this stub from the start of the stubs. */ + + s->output_section->vma) /* Address of the start of the current section. */ + + 4 /* The branch instruction is 4 bytes into the stub. */ + + 8); /* ARM branches work from the pc of the instruction + 8. */ + + bfd_put_32 (output_bfd, + 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 = + s->output_offset + + my_offset + - (input_section->output_offset + + offset + addend) + - 4; + + tmp = bfd_get_32 (input_bfd, hit_data + - input_section->vma); + + bfd_put_32 (output_bfd, + 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; + char *name; + bfd *input_bfd; + bfd *output_bfd; + asection *input_section; + bfd_byte *hit_data; + asection *sym_sec; + int offset; + int addend; + bfd_vma val; +{ + unsigned long int tmp; + long int 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_get_filename (sym_sec->owner), name); + _bfd_error_handler + (_ (" first occurrence: %s: arm call to thumb"), + bfd_get_filename (input_bfd)); + } + --my_offset; + myh->root.u.def.value = my_offset; + + bfd_put_32 (output_bfd, a2t1_ldr_insn, + s->contents + my_offset); + + bfd_put_32 (output_bfd, 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, 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) + 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; + unsigned char sym_flags; +{ + 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; + struct elf_link_hash_entry * h = NULL; + bfd_vma addend; + + 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); + +#ifdef USE_REL + addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask); +#else + 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: + /* When generating a shared object, these relocations are copied + into the output file to be resolved at run time. */ + + if (info->shared + && (r_type != R_ARM_PC24 + || (h != NULL + && h->dynindx != -1 + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + { + Elf_Internal_Rel outrel; + 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; + + if (elf_section_data (input_section)->stab_info == NULL) + outrel.r_offset = rel->r_offset; + else + { + bfd_vma off; + + off = (_bfd_stab_section_offset + (output_bfd, &elf_hash_table (info)->stab_info, + input_section, + & elf_section_data (input_section)->stab_info, + rel->r_offset)); + if (off == (bfd_vma) -1) + skip = true; + outrel.r_offset = off; + } + + outrel.r_offset += (input_section->output_section->vma + + input_section->output_offset); + + if (skip) + { + memset (&outrel, 0, sizeof outrel); + relocate = false; + } + else if (r_type == R_ARM_PC24) + { + BFD_ASSERT (h != NULL && h->dynindx != -1); + if ((input_section->flags & SEC_ALLOC) != 0) + relocate = false; + else + relocate = true; + outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_PC24); + } + else + { + if (h == NULL + || ((info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) != 0)) + { + relocate = true; + outrel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); + } + else + { + BFD_ASSERT (h->dynindx != -1); + if ((input_section->flags & SEC_ALLOC) != 0) + relocate = false; + else + relocate = true; + outrel.r_info = ELF32_R_INFO (h->dynindx, R_ARM_ABS32); + } + } + + bfd_elf32_swap_reloc_out (output_bfd, &outrel, + (((Elf32_External_Rel *) + sreloc->contents) + + sreloc->reloc_count)); + ++sreloc->reloc_count; + + /* 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) + { + case R_ARM_PC24: + /* Arm B/BL instruction */ + + /* 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, addend, value); + return bfd_reloc_ok; + } + + value = value + addend; + value -= (input_section->output_section->vma + + input_section->output_offset + 8); + value -= rel->r_offset; + value = value >> howto->rightshift; + + value &= 0xffffff; + value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000); + 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); + 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. */ +#ifdef 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; + + case R_ARM_THM_PC22: + /* Thumb BL (branch long instruction). */ + { + bfd_vma relocation; + 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_vma src_mask = 0x007FFFFE; + bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1; + bfd_signed_vma reloc_signed_min = ~reloc_signed_max; + bfd_vma check; + bfd_signed_vma signed_check; + bfd_vma add; + bfd_signed_vma signed_add; + +#ifdef USE_REL + /* Need to refetch the addend and squish the two 11 bit pieces + together. */ + { + bfd_vma upper = bfd_get_16 (input_bfd, hit_data) & 0x7ff; + bfd_vma lower = bfd_get_16 (input_bfd, hit_data + 2) & 0x7ff; + upper = (upper ^ 0x400) - 0x400; /* sign extend */ + addend = (upper << 12) | (lower << 1); + } +#endif + + /* If it's not a call to thumb, assume call to arm */ + if (sym_flags != STT_ARM_TFUNC) + { + if (elf32_thumb_to_arm_stub + (info, sym_name, input_bfd, output_bfd, input_section, + hit_data, sym_sec, rel->r_offset, addend, value)) + return bfd_reloc_ok; + else + return bfd_reloc_dangerous; + } + + /* +4: pc is offset by 4 */ + relocation = value + addend + 4; + relocation -= (input_section->output_section->vma + + input_section->output_offset); + relocation -= rel->r_offset; + + 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); + + add = ((upper_insn & 0x7ff) << 12) | ((lower_insn & 0x7ff) << 1); + /* sign extend */ + signed_add = (add ^ 0x400000) - 0x400000; + + /* Add the value from the object file. */ + signed_check += signed_add; + relocation += signed_add; + + /* Assumes two's complement. */ + if (signed_check > reloc_signed_max + || signed_check < reloc_signed_min) + overflow = true; + + /* 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_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; + + /* 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; + + off = h->got.offset; + BFD_ASSERT (off != (bfd_vma) -1); + + if (!elf_hash_table (info)->dynamic_sections_created || + (info->shared && (info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) + { + /* 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 + { + 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_Rel outrel; + + 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); + bfd_elf32_swap_reloc_out (output_bfd, &outrel, + (((Elf32_External_Rel *) + srelgot->contents) + + srelgot->reloc_count)); + ++srelgot->reloc_count; + } + + 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_PLT32: + /* Relocation is to the entry for this symbol in the + procedure linkage table. */ + + /* Resolve a PLT32 reloc against a local symbol directly, + without using the procedure linkage table. */ + if (h == NULL) + return _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, value, + (bfd_vma) 0); + + if (h->plt.offset == (bfd_vma) -1) + /* We didn't make a PLT entry for this symbol. This + happens when statically linking PIC code, or when + using -Bsymbolic. */ + return _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, value, + (bfd_vma) 0); + + BFD_ASSERT(splt != NULL); + if (splt == NULL) + return bfd_reloc_notsupported; + + 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); + + 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; + } +} + + +/* Relocate an ARM ELF section. */ +static 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; + + 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; + + 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; + + /* ScottB: range check r_type here. */ + + howto = elf32_arm_howto_table + r_type; + + if (info->relocateable) + { + /* This is a relocateable 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]; +#ifdef USE_REL + { + bfd_vma val; + val = bfd_get_32 (input_bfd, contents + rel->r_offset); + val += (sec->output_offset + sym->st_value) >> howto->rightshift; + bfd_put_32 (input_bfd, val, contents + rel->r_offset); + } +#else + rel->r_addend += (sec->output_offset + sym->st_value) + >> howto->rightshift; +#endif + } + } + + continue; + } + + /* 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]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + } + else + { + h = sym_hashes[r_symndx - symtab_hdr->sh_info]; + while (h->root.type == bfd_link_hash_indirect + || h->root.type == bfd_link_hash_warning) + h = (struct elf_link_hash_entry *) h->root.u.i.link; + if (h->root.type == bfd_link_hash_defined + || h->root.type == bfd_link_hash_defweak) + { + sec = h->root.u.def.section; + + relocation = (h->root.u.def.value + + sec->output_section->vma + + sec->output_offset); + + /* 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: + if (info->shared + && ( + (!info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR == 0) + ) + && ((input_section->flags & SEC_ALLOC) != 0) + ) + relocation = 0; + break; + + case R_ARM_GOTPC: + relocation = 0; + break; + + case R_ARM_GOT32: + if (elf_hash_table(info)->dynamic_sections_created + && (!info->shared + || (!info->symbolic && h->dynindx != -1) + || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 + ) + ) + relocation = 0; + break; + + case R_ARM_PLT32: + if (h->plt.offset != (bfd_vma)-1) + relocation = 0; + break; + + default: + if (sec->output_section == NULL) + { + (*_bfd_error_handler) + (_("%s: warning: unresolvable relocation against symbol `%s' from %s section"), + bfd_get_filename (input_bfd), h->root.root.string, + bfd_get_section_name (input_bfd, input_section)); + relocation = 0; + } + } + } + else if (h->root.type == bfd_link_hash_undefweak) + relocation = 0; + else + { + if (!((*info->callbacks->undefined_symbol) + (info, h->root.root.string, input_bfd, + input_section, rel->r_offset))) + return false; + relocation = 0; + } + } + + 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))); + + if (r != bfd_reloc_ok) + { + const char * msg = (const char *) 0; + + switch (r) + { + case bfd_reloc_overflow: + if (!((*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))) + 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; +} + +/* Function to keep ARM specific flags in the ELF header. */ +static boolean +elf32_arm_set_private_flags (abfd, flags) + bfd *abfd; + flagword flags; +{ + if (elf_flags_init (abfd) + && elf_elfheader (abfd)->e_flags != flags) + { + if (flags & EF_INTERWORK) + _bfd_error_handler (_ ("\ +Warning: Not setting interwork flag of %s since it has already been specified as non-interworking"), + bfd_get_filename (abfd)); + else + _bfd_error_handler (_ ("\ +Warning: Clearing the interwork flag of %s due to outside request"), + bfd_get_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 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) && in_flags != out_flags) + { + /* Cannot mix PIC and non-PIC code. */ + if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) + return false; + + /* Cannot mix APCS26 and APCS32 code. */ + if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) + return false; + + /* Cannot mix float APCS and non-float APCS code. */ + if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) + return false; + + /* If the src and dest have different interworking flags + then turn off the interworking bit. */ + if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) + { + if (out_flags & EF_INTERWORK) + _bfd_error_handler (_ ("\ +Warning: Clearing the interwork flag in %s because non-interworking code in %s has been linked with it"), + bfd_get_filename (obfd), bfd_get_filename (ibfd)); + + in_flags &= ~EF_INTERWORK; + } + } + + 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 boolean +elf32_arm_merge_private_bfd_data (ibfd, obfd) + bfd *ibfd; + bfd *obfd; +{ + flagword out_flags; + flagword in_flags; + + if ( bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return true; + + /* Check if we have the same endianess */ + if ( ibfd->xvec->byteorder != obfd->xvec->byteorder + && obfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN + && ibfd->xvec->byteorder != BFD_ENDIAN_UNKNOWN) + { + (*_bfd_error_handler) + (_("%s: compiled for a %s endian system and target is %s endian"), + bfd_get_filename (ibfd), + bfd_big_endian (ibfd) ? "big" : "little", + bfd_big_endian (obfd) ? "big" : "little"); + + bfd_set_error (bfd_error_wrong_format); + return false; + } + + /* 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 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 + unitialised values, which surprise surprise, correspond + to the default values. */ + if (bfd_get_arch_info (ibfd)->the_default) + 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; + } + + /* Check flag compatibility. */ + if (in_flags == out_flags) + return true; + + /* Complain about various flag mismatches. */ + + if ((in_flags & EF_APCS_26) != (out_flags & EF_APCS_26)) + _bfd_error_handler (_ ("\ +Error: %s compiled for APCS-%d, whereas %s is compiled for APCS-%d"), + bfd_get_filename (ibfd), + in_flags & EF_APCS_26 ? 26 : 32, + bfd_get_filename (obfd), + out_flags & EF_APCS_26 ? 26 : 32); + + if ((in_flags & EF_APCS_FLOAT) != (out_flags & EF_APCS_FLOAT)) + _bfd_error_handler (_ ("\ +Error: %s passes floats in %s registers, whereas %s passes them in %s registers"), + bfd_get_filename (ibfd), + in_flags & EF_APCS_FLOAT ? _ ("float") : _ ("integer"), + bfd_get_filename (obfd), + out_flags & EF_APCS_26 ? _ ("float") : _ ("integer")); + + if ((in_flags & EF_PIC) != (out_flags & EF_PIC)) + _bfd_error_handler (_ ("\ +Error: %s is compiled as position %s code, whereas %s is not"), + bfd_get_filename (ibfd), + in_flags & EF_PIC ? _ ("independent") : _ ("dependent"), + bfd_get_filename (obfd)); + + /* Interworking mismatch is only a warning. */ + if ((in_flags & EF_INTERWORK) != (out_flags & EF_INTERWORK)) + { + _bfd_error_handler (_ ("\ +Warning: %s %s interworking, whereas %s %s"), + bfd_get_filename (ibfd), + in_flags & EF_INTERWORK ? _ ("supports") : _ ("does not support"), + bfd_get_filename (obfd), + out_flags & EF_INTERWORK ? _ ("does not") : _ ("does")); + return true; + } + + return false; +} + +/* Display the flags field */ +static boolean +elf32_arm_print_private_bfd_data (abfd, ptr) + bfd *abfd; + PTR ptr; +{ + FILE *file = (FILE *) ptr; + + BFD_ASSERT (abfd != NULL && ptr != NULL); + + /* Print normal ELF private data. */ + _bfd_elf_print_private_bfd_data (abfd, ptr); + + /* 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); + + if (elf_elfheader (abfd)->e_flags & EF_INTERWORK) + fprintf (file, _ (" [interworking enabled]")); + else + fprintf (file, _ (" [interworking not enabled]")); + + if (elf_elfheader (abfd)->e_flags & EF_APCS_26) + fprintf (file, _ (" [APCS-26]")); + else + fprintf (file, _ (" [APCS-32]")); + + if (elf_elfheader (abfd)->e_flags & EF_APCS_FLOAT) + fprintf (file, _ (" [floats passed in float registers]")); + else + fprintf (file, _ (" [floats passed in integer registers]")); + + if (elf_elfheader (abfd)->e_flags & EF_PIC) + fprintf (file, _ (" [position independent]")); + else + fprintf (file, _ (" [absolute position]")); + + fputc ('\n', file); + + return true; +} + +static int +elf32_arm_get_symbol_type (elf_sym, type) + Elf_Internal_Sym * elf_sym; + int type; +{ + if (ELF_ST_TYPE (elf_sym->st_info) == STT_ARM_TFUNC) + return ELF_ST_TYPE (elf_sym->st_info); + else + return type; +} + +static asection * +elf32_arm_gc_mark_hook (abfd, info, rel, h, sym) + bfd *abfd; + struct bfd_link_info *info; + 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; + } + } + } + else + { + if (!(elf_bad_symtab (abfd) + && ELF_ST_BIND (sym->st_info) != STB_LOCAL) + && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE) + && sym->st_shndx != SHN_COMMON)) + { + return bfd_section_from_elf_index (abfd, sym->st_shndx); + } + } + return NULL; +} + +static boolean +elf32_arm_gc_sweep_hook (abfd, info, sec, relocs) + bfd *abfd; + struct bfd_link_info *info; + asection *sec; + const Elf_Internal_Rela *relocs; +{ + /* we don't use got and plt entries for armelf */ + return true; +} + +/* Look through the relocs for a section during the first phase. + Since we don't do .gots or .plts, we just need to consider the + virtual table relocs for gc. */ + +static 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 * sgot, *srelgot, *sreloc; + bfd_vma * local_got_offsets; + + if (info->relocateable) + return true; + + sgot = srelgot = 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]; + + /* Some relocs require a global offset table. */ + if (dynobj == NULL) + { + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_ARM_GOT32: + case R_ARM_GOTOFF: + case R_ARM_GOTPC: + elf_hash_table (info)->dynobj = dynobj = abfd; + if (! _bfd_elf_create_got_section (dynobj, info)) + return false; + break; + + default: + break; + } + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + case R_ARM_GOT32: + /* This symbol requires a global offset table entry. */ + if (sgot == NULL) + { + sgot = bfd_get_section_by_name (dynobj, ".got"); + BFD_ASSERT (sgot != NULL); + } + + /* Get the got relocation section if necessary. */ + if (srelgot == NULL + && (h != NULL || info->shared)) + { + srelgot = bfd_get_section_by_name (dynobj, ".rel.got"); + + /* If no got relocation section, make one and initialize. */ + if (srelgot == NULL) + { + srelgot = bfd_make_section (dynobj, ".rel.got"); + if (srelgot == NULL + || ! bfd_set_section_flags (dynobj, srelgot, + (SEC_ALLOC + | SEC_LOAD + | SEC_HAS_CONTENTS + | SEC_IN_MEMORY + | SEC_LINKER_CREATED + | SEC_READONLY)) + || ! bfd_set_section_alignment (dynobj, srelgot, 2)) + return false; + } + } + + if (h != NULL) + { + if (h->got.offset != (bfd_vma) -1) + /* We have already allocated space in the .got. */ + break; + + h->got.offset = sgot->_raw_size; + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + + srelgot->_raw_size += sizeof (Elf32_External_Rel); + } + else + { + /* This is a global offset table entry for a local + symbol. */ + if (local_got_offsets == NULL) + { + size_t size; + register unsigned int i; + + size = symtab_hdr->sh_info * sizeof (bfd_vma); + local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size); + if (local_got_offsets == NULL) + return false; + elf_local_got_offsets (abfd) = local_got_offsets; + for (i = 0; i < symtab_hdr->sh_info; i++) + local_got_offsets[i] = (bfd_vma) -1; + } + + if (local_got_offsets[r_symndx] != (bfd_vma) -1) + /* We have already allocated space in the .got. */ + break; + + local_got_offsets[r_symndx] = sgot->_raw_size; + + if (info->shared) + /* If we are generating a shared object, we need to + output a R_ARM_RELATIVE reloc so that the dynamic + linker can adjust this GOT entry. */ + srelgot->_raw_size += sizeof (Elf32_External_Rel); + } + + sgot->_raw_size += 4; + break; + + case R_ARM_PLT32: + /* This symbol requires a procedure linkage table entry. We + actually build the entry in adjust_dynamic_symbol, + because this might be a case of linking PIC code which is + never referenced by a dynamic object, in which case we + don't need to generate a procedure linkage table entry + after all. */ + + /* If this is a local symbol, we resolve it directly without + creating a procedure linkage table entry. */ + if (h == NULL) + continue; + + h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT; + break; + + case R_ARM_ABS32: + case R_ARM_REL32: + case R_ARM_PC24: + /* 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 + pcrel_relocs_copied field of the hash table entry. */ + if (info->shared + && (ELF32_R_TYPE (rel->r_info) != R_ARM_PC24 + || (h != NULL + && (! info->symbolic + || (h->elf_link_hash_flags + & ELF_LINK_HASH_DEF_REGULAR) == 0)))) + { + /* When creating a shared object, we must copy these + reloc types into the output file. We create a reloc + section in dynobj and make room for this reloc. */ + 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; + } + } + + sreloc->_raw_size += sizeof (Elf32_External_Rel); + /* If we are linking with -Bsymbolic, and this is a + global symbol, we count the number of PC relative + relocations we have entered for this symbol, so that + we can discard them again if the symbol is later + defined by a regular object. Note that this function + is only called if we are using an elf_i386 linker + hash table, which means that h is really a pointer to + an elf_i386_link_hash_entry. */ + if (h != NULL && info->symbolic + && ELF32_R_TYPE (rel->r_info) == R_ARM_PC24) + { + struct elf32_arm_link_hash_entry * eh; + struct elf32_arm_pcrel_relocs_copied * p; + + eh = (struct elf32_arm_link_hash_entry *) h; + + for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next) + if (p->section == sreloc) + break; + + if (p == NULL) + { + p = ((struct elf32_arm_pcrel_relocs_copied *) + bfd_alloc (dynobj, sizeof * p)); + + if (p == NULL) + return false; + p->next = eh->pcrel_relocs_copied; + eh->pcrel_relocs_copied = p; + p->section = sreloc; + p->count = 0; + } + + ++p->count; + } + } + break; + + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_ARM_GNU_VTINHERIT: + if (!_bfd_elf32_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_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + 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 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; +{ + 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)) + 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 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 (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 + && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) + { + /* 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. In such a case, we don't actually need to build + a procedure linkage table, and we can just do a PC32 + reloc instead. */ + BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0); + return true; + } + + /* Make sure this symbol is output as a dynamic symbol. */ + if (h->dynindx == -1) + { + if (! bfd_elf32_link_record_dynamic_symbol (info, h)) + return false; + } + + s = bfd_get_section_by_name (dynobj, ".plt"); + BFD_ASSERT (s != NULL); + + /* If this is the first .plt entry, make room for the special + first entry. */ + if (s->_raw_size == 0) + s->_raw_size += PLT_ENTRY_SIZE; + + /* If this symbol is not defined in a regular file, and we are + not generating a shared library, then set the symbol to this + location in the .plt. This is required to make function + pointers compare as equal between the normal executable and + the shared library. */ + if (! info->shared + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + { + h->root.u.def.section = s; + h->root.u.def.value = s->_raw_size; + } + + h->plt.offset = s->_raw_size; + + /* Make room for this entry. */ + s->_raw_size += PLT_ENTRY_SIZE; + + /* We also need to make an entry in the .got.plt section, which + will be placed in the .got section by the linker script. */ + + s = bfd_get_section_by_name (dynobj, ".got.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += 4; + + /* We also need to make an entry in the .rel.plt section. */ + + s = bfd_get_section_by_name (dynobj, ".rel.plt"); + BFD_ASSERT (s != NULL); + s->_raw_size += sizeof (Elf32_External_Rel); + + return true; + } + + /* If this is a weak symbol, and there is a real definition, the + processor independent code will have arranged for us to see the + real definition first, and we can just use the same value. */ + if (h->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; +} + +/* Set the sizes of the dynamic sections. */ + +static boolean +elf32_arm_size_dynamic_sections (output_bfd, info) + bfd * output_bfd; + struct bfd_link_info * info; +{ + bfd * dynobj; + asection * s; + boolean plt; + boolean relocs; + boolean reltext; + + 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->shared) + { + 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; + } + } + else + { + /* We may have created entries in the .rel.got section. + However, if we are not creating the dynamic sections, we will + not actually use these entries. Reset the size of .rel.got, + which will cause it to get stripped from the output file + below. */ + s = bfd_get_section_by_name (dynobj, ".rel.got"); + if (s != NULL) + s->_raw_size = 0; + } + + /* If this is a -Bsymbolic shared link, then we need to discard all + PC relative relocs against symbols defined in a regular object. + We allocated space for them in the check_relocs routine, but we + will not fill them in in the relocate_section routine. */ + if (info->shared && info->symbolic) + elf32_arm_link_hash_traverse (elf32_arm_hash_table (info), + elf32_arm_discard_copies, + (PTR) NULL); + + /* The check_relocs and adjust_dynamic_symbol entry points have + determined the sizes of the various dynamic sections. Allocate + memory for them. */ + plt = false; + relocs = false; + reltext = false; + for (s = dynobj->sections; s != NULL; s = s->next) + { + const char * name; + 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 + { + asection * target; + + /* Remember whether there are any reloc sections other + than .rel.plt. */ + if (strcmp (name, ".rel.plt") != 0) + { + const char *outname; + + relocs = true; + + /* If this relocation section applies to a read only + section, then we probably need a DT_TEXTREL + entry. The entries in the .rel.plt section + really apply to the .got section, which we + created ourselves and so know is not readonly. */ + outname = bfd_get_section_name (output_bfd, + s->output_section); + target = bfd_get_section_by_name (output_bfd, outname + 4); + if (target != NULL + && (target->flags & SEC_READONLY) != 0 + && (target->flags & SEC_ALLOC) != 0) + reltext = true; + } + + /* We use the reloc_count field as a counter if we need + to copy relocs into the output file. */ + s->reloc_count = 0; + } + } + else if (strncmp (name, ".got", 4) != 0) + { + /* It's not one of our sections, so don't allocate space. */ + continue; + } + + if (strip) + { + asection ** spp; + + for (spp = &s->output_section->owner->sections; + *spp != s->output_section; + spp = &(*spp)->next) + ; + *spp = s->output_section->next; + --s->output_section->owner->section_count; + + 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. */ + if (! info->shared) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0)) + return false; + } + + if (plt) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_REL) + || ! bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0)) + return false; + } + + if (relocs) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_REL, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELSZ, 0) + || ! bfd_elf32_add_dynamic_entry (info, DT_RELENT, + sizeof (Elf32_External_Rel))) + return false; + } + + if (reltext) + { + if (! bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0)) + return false; + } + } + + return true; +} + +/* This function is called via elf32_arm_link_hash_traverse if we are + creating a shared object with -Bsymbolic. It discards the space + allocated to copy PC relative relocs against symbols which are + defined in regular objects. We allocated space for them in the + check_relocs routine, but we won't fill them in in the + relocate_section routine. */ + +static boolean +elf32_arm_discard_copies (h, ignore) + struct elf32_arm_link_hash_entry * h; + PTR ignore; +{ + struct elf32_arm_pcrel_relocs_copied * s; + + /* We only discard relocs for symbols defined in a regular object. */ + if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) + return true; + + for (s = h->pcrel_relocs_copied; s != NULL; s = s->next) + s->section->_raw_size -= s->count * sizeof (Elf32_External_Rel); + + return true; +} + +/* Finish up dynamic symbol handling. We set the contents of various + dynamic sections here. */ + +static 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_Rel rel; + + /* 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_ENTRY_SIZE - 1; + + /* 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; + + /* Fill in the entry in the procedure linkage table. */ + memcpy (splt->contents + h->plt.offset, + elf32_arm_plt_entry, + PLT_ENTRY_SIZE); + bfd_put_32 (output_bfd, + (sgot->output_section->vma + + sgot->output_offset + + got_offset + - splt->output_section->vma + - splt->output_offset + - h->plt.offset - 12), + splt->contents + h->plt.offset + 12); + + /* 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); + bfd_elf32_swap_reloc_out (output_bfd, &rel, + ((Elf32_External_Rel *) srel->contents + + plt_index)); + + 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 (h->got.offset != (bfd_vma) -1) + { + asection * sgot; + asection * srel; + Elf_Internal_Rel rel; + + /* 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 &~ 1)); + + /* If this is a -Bsymbolic link, and the symbol is defined + locally, 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 + && (info->symbolic || h->dynindx == -1) + && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)) + rel.r_info = ELF32_R_INFO (0, R_ARM_RELATIVE); + else + { + 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); + } + + bfd_elf32_swap_reloc_out (output_bfd, &rel, + ((Elf32_External_Rel *) srel->contents + + srel->reloc_count)); + ++srel->reloc_count; + } + + if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0) + { + asection * s; + Elf_Internal_Rel rel; + + /* 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); + bfd_elf32_swap_reloc_out (output_bfd, &rel, + ((Elf32_External_Rel *) s->contents + + s->reloc_count)); + ++s->reloc_count; + } + + /* 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 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; + } + } + + /* Fill in the first entry in the procedure linkage table. */ + if (splt->_raw_size > 0) + memcpy (splt->contents, elf32_arm_plt0_entry, PLT_ENTRY_SIZE); + + /* 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; +} + +#define ELF_ARCH bfd_arch_arm +#define ELF_MACHINE_CODE EM_ARM +#define ELF_MAXPAGE_SIZE 0x8000 + + +#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 _bfd_elf_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_can_gc_sections 1 +#define elf_backend_plt_readonly 1 +#define elf_backend_want_got_plt 1 +#define elf_backend_want_plt_sym 0 + +#include "elf32-target.h" |