typedef unsigned long int insn32;
typedef unsigned short int insn16;
-static reloc_howto_type *elf32_arm_reloc_type_lookup
- PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
-static void elf32_arm_info_to_howto
- PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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_print_private_bfd_data
PARAMS ((bfd *, PTR));
-static int elf32_arm_get_symbol_type
+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, struct elf_link_hash_entry *));
static insn32 insert_thumb_branch
PARAMS ((insn32, int));
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 *));
+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));
/* The linker script knows the section names for placement.
The entry_names are used to do simple name mangling on the stubs.
#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 calls 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, #8]! */
+};
+
+/* 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))
long int arm_glue_size;
/* An arbitary input BFD chosen to hold the glue sections. */
- bfd *bfd_of_glue_owner;
+ 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;
};
+/* 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->pcrel_relocs_copied = NULL;
+
+ return (struct bfd_hash_entry *) ret;
+}
/* Create an ARM elf linker hash table */
return NULL;
if (!_bfd_elf_link_hash_table_init (&ret->root, abfd,
- _bfd_elf_link_hash_newfunc))
+ elf32_arm_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;
+ ret->no_pipeline_knowledge = 0;
return &ret->root.root;
}
ldmia r13! {r6, lr}
bx lr
__func_addr:
- .word func
+ .word func
*/
#define THUMB2ARM_GLUE_SIZE 8
boolean
bfd_elf32_arm_allocate_interworking_sections (info)
- struct bfd_link_info *info;
+ struct bfd_link_info * info;
{
- asection *s;
- bfd_byte *foo;
- struct elf32_arm_link_hash_table *globals;
+ asection * s;
+ bfd_byte * foo;
+ struct elf32_arm_link_hash_table * globals;
globals = elf32_arm_hash_table (info);
static void
record_arm_to_thumb_glue (link_info, h)
- struct bfd_link_info *link_info;
- struct elf_link_hash_entry *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;
+ 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);
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 = bfd_make_section (abfd, ARM2THUMB_GLUE_SECTION_NAME);
|| !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);
|| !bfd_set_section_flags (abfd, sec, flags)
|| !bfd_set_section_alignment (abfd, sec, 2))
return false;
+
+ sec->gc_mark = 1;
}
/* Save the bfd for later use. */
}
boolean
-bfd_elf32_arm_process_before_allocation (abfd, link_info)
+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 *free_relocs = NULL;
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;
{
long r_type;
unsigned long r_index;
- unsigned char code;
struct elf_link_hash_entry *h;
r_index = ELF32_R_SYM (irel->r_info);
/* These are the only relocation types we care about */
- if (r_type != R_ARM_PC24
+ if ( r_type != R_ARM_PC24
&& r_type != R_ARM_THM_PC22)
continue;
break;
case R_ARM_THM_PC22:
- /* This one is a call from thumb code. We look
+ /* 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. */
+ target, we insert glue. */
if (ELF_ST_TYPE (h->type) != STT_ARM_TFUNC)
record_thumb_to_arm_glue (link_info, h);
}
-struct elf32_arm_reloc_map
- {
- unsigned char bfd_reloc_val;
- unsigned char elf_reloc_val;
- };
-
-static const struct elf32_arm_reloc_map elf32_arm_reloc_map[] =
-{
- {BFD_RELOC_NONE, R_ARM_NONE,},
- {BFD_RELOC_ARM_PCREL_BRANCH, R_ARM_PC24,},
- {BFD_RELOC_32, R_ARM_ABS32,},
- {BFD_RELOC_32_PCREL, R_ARM_REL32,},
- {BFD_RELOC_8, R_ARM_ABS8,},
- {BFD_RELOC_16, R_ARM_ABS16,},
- {BFD_RELOC_ARM_OFFSET_IMM, R_ARM_ABS12,},
- {BFD_RELOC_ARM_THUMB_OFFSET, R_ARM_THM_ABS5,},
- {BFD_RELOC_THUMB_PCREL_BRANCH23, R_ARM_THM_PC22,},
- {BFD_RELOC_VTABLE_INHERIT, R_ARM_GNU_VTINHERIT },
- {BFD_RELOC_VTABLE_ENTRY, R_ARM_GNU_VTENTRY },
- {BFD_RELOC_NONE, R_ARM_SBREL32,},
- {BFD_RELOC_NONE, R_ARM_AMP_VCALL9,},
- {BFD_RELOC_THUMB_PCREL_BRANCH12, R_ARM_THM_PC11,},
- {BFD_RELOC_THUMB_PCREL_BRANCH9, R_ARM_THM_PC9,}
-};
-
-static reloc_howto_type *
-elf32_arm_reloc_type_lookup (abfd, code)
- bfd *abfd;
- bfd_reloc_code_real_type code;
-{
- unsigned int i;
-
- for (i = 0;
- i < sizeof (elf32_arm_reloc_map) / sizeof (struct elf32_arm_reloc_map);
- i++)
- {
- if (elf32_arm_reloc_map[i].bfd_reloc_val == code)
- return &elf32_arm_howto_table[elf32_arm_reloc_map[i].elf_reloc_val];
- }
-
- return NULL;
-}
-
/* 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
+ 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.
+ instruction.
- It takes two thumb instructions to encode the target address. Each has
+ 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).
+ 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
+ Combine together and shifted left by 1 (it's a half word address) and
there you have it.
Op: 1111 = F,
Op: 1111 = F,
H-1, lower address-0 = 800
- They can be ordered either way, but the arm tools I've seen always put
+ 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)
}
/* Thumb code calling an ARM function */
-int
+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;
+ 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;
+ 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;
+ struct elf_link_hash_entry * myh;
+ struct elf32_arm_link_hash_table * globals;
myh = find_thumb_glue (info, name, input_bfd);
if (myh == NULL)
}
/* Arm code calling a Thumb function */
-int
+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;
+ 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;
long int my_offset;
- asection *s;
+ asection * s;
long int ret_offset;
- struct elf_link_hash_entry *myh;
- struct elf32_arm_link_hash_table *globals;
+ struct elf_link_hash_entry * myh;
+ struct elf32_arm_link_hash_table * globals;
myh = find_arm_glue (info, name, input_bfd);
if (myh == NULL)
+ 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, offset, value,
- addend, info, sym_sec, sym_name, sym_flags)
- reloc_howto_type *howto;
- bfd *input_bfd;
- bfd *output_bfd;
- asection *input_section;
- bfd_byte *contents;
- bfd_vma offset;
- bfd_vma value;
- bfd_vma addend;
- struct bfd_link_info *info;
- asection *sym_sec;
- const char *sym_name;
- unsigned char sym_flags;
+ 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;
+ unsigned char sym_flags;
+ struct elf_link_hash_entry * h;
{
- unsigned long r_type = howto->type;
- bfd_byte *hit_data = contents + offset;
+ 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;
- switch (r_type)
+ 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);
+
+#ifdef 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:
- /* Arm B/BL instruction */
-
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
- /* check for arm calling thumb function */
- if (sym_flags == STT_ARM_TFUNC)
+ 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))))
{
- elf32_arm_to_thumb_stub (info, sym_name, input_bfd, output_bfd,
- input_section, hit_data, sym_sec, offset, addend, value);
- return bfd_reloc_ok;
+ 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 */
- value = value + addend;
- value -= (input_section->output_section->vma
- + input_section->output_offset + 8);
- value -= offset;
- value = value >> howto->rightshift;
+ /* 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;
+ }
- value &= 0xffffff;
- value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);
- bfd_put_32 (input_bfd, value, hit_data);
- 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. */
- case R_ARM_ABS32:
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
- value += addend;
- if (sym_flags == STT_ARM_TFUNC)
- value |= 1;
- bfd_put_32 (input_bfd, value, hit_data);
- return bfd_reloc_ok;
+ value -= (input_section->output_section->vma
+ + input_section->output_offset);
+ value -= rel->r_offset;
+ value += addend;
- case R_ARM_REL32:
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
- value -= (input_section->output_section->vma
- + input_section->output_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;
+ }
+ }
+
+ /* 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. */
+ signed_addend = value;
+ signed_addend >>= howto->rightshift;
+ if (signed_addend > ((bfd_signed_vma)(howto->dst_mask >> 1))
+ || signed_addend < - ((bfd_signed_vma) ((howto->dst_mask + 1) >> 1)))
+ return bfd_reloc_overflow;
+ }
+
+ 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);
+ value += addend;
+ break;
+ }
bfd_put_32 (input_bfd, value, hit_data);
return bfd_reloc_ok;
case R_ARM_ABS8:
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
value += addend;
if ((long) value > 0x7f || (long) value < -0x80)
return bfd_reloc_overflow;
return bfd_reloc_ok;
case R_ARM_ABS16:
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
value += addend;
if ((long) value > 0x7fff || (long) value < -0x8000)
case R_ARM_ABS12:
/* Support ldr and str instruction for the arm */
- /* Also thumb b (unconditional branch) */
-#ifdef USE_REL
- addend = (bfd_get_32 (input_bfd, hit_data) & howto->src_mask);
-#endif
+ /* Also thumb b (unconditional branch). ??? Really? */
value += addend;
if ((long) value > 0x7ff || (long) value < -0x800)
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 |= bfd_get_16 (input_bfd, hit_data) & 0xf82f;
+ /* ??? 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). */
+ /* Thumb BL (branch long instruction). */
{
- bfd_vma relocation;
- boolean overflow = false;
- bfd_vma insn = bfd_get_32 (input_bfd, hit_data);
- bfd_vma src_mask = 0x007FFFFE;
+ 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_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 reloc_signed_min = ~ reloc_signed_max;
+ bfd_vma check;
bfd_signed_vma signed_check;
- bfd_vma add;
- bfd_signed_vma signed_add;
- /* If it's not a call to thumb, assume call to arm */
- if (sym_flags != STT_ARM_TFUNC)
+#ifdef 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
+
+ /* 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, offset, addend, value))
+ hit_data, sym_sec, rel->r_offset, signed_addend, value))
return bfd_reloc_ok;
else
return bfd_reloc_dangerous;
}
- relocation = value + addend;
- relocation -= (input_section->output_section->vma + input_section->output_offset);
- relocation -= offset;
+ 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 ((bfd_signed_vma) relocation >= 0)
signed_check = check;
else
- signed_check = (check | ((bfd_vma) - 1 & ~((bfd_vma) - 1 >> howto->rightshift)));
-
- /* Get the value from the object file. */
- if (bfd_big_endian (input_bfd))
- add = (((insn) & 0x07ff0000) >> 4) | (((insn) & 0x7ff) << 1);
- else
- add = ((((insn) & 0x7ff) << 12) | (((insn) & 0x07ff0000) >> 15));
-
- /* Get the value from the object file with an appropriate sign.
- The expression involving howto->src_mask isolates the upper
- bit of src_mask. If that bit is set in the value we are
- adding, it is negative, and we subtract out that number times
- two. If src_mask includes the highest possible bit, then we
- can not get the upper bit, but that does not matter since
- signed_add needs no adjustment to become negative in that case. */
-
- signed_add = add;
-
- if ((add & (((~src_mask) >> 1) & src_mask)) != 0)
- signed_add -= (((~src_mask) >> 1) & src_mask) << 1;
-
- /* Add the value from the object file, shifted so that it is a
- straight number. */
- /* howto->bitpos == 0 */
-
- signed_check += signed_add;
- relocation += signed_add;
+ signed_check = check | ~((bfd_vma) -1 >> howto->rightshift);
/* Assumes two's complement. */
- if (signed_check > reloc_signed_max
- || signed_check < reloc_signed_min)
+ if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)
overflow = true;
- /* Put RELOCATION into the correct bits: */
-
- if (bfd_big_endian (input_bfd))
- relocation = (((relocation & 0xffe) >> 1) | ((relocation << 4) & 0x07ff0000));
- else
- relocation = (((relocation & 0xffe) << 15) | ((relocation >> 12) & 0x7ff));
-
- /* Add RELOCATION to the correct bits of X: */
- insn = ((insn & ~howto->dst_mask) | relocation);
+ /* 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_32 (input_bfd, insn, hit_data);
+ 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);
}
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;
}
}
+#ifdef 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_vma contents;
+ bfd_signed_vma addend;
+
+ 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)
+ {
+ case R_ARM_THM_PC22:
+ 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 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;
+ 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, *relend;
- const char *name;
+ 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;
+ 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;
+ 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);
+ r_type = ELF32_R_TYPE (rel->r_info);
- if (r_type == R_ARM_GNU_VTENTRY
- || r_type == R_ARM_GNU_VTINHERIT )
+ if ( r_type == R_ARM_GNU_VTENTRY
+ || r_type == R_ARM_GNU_VTINHERIT)
continue;
- howto = elf32_arm_howto_table + r_type;
+ elf32_arm_info_to_howto (input_bfd, & bfd_reloc, rel);
+ howto = bfd_reloc.howto;
if (info->relocateable)
{
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
{
sec = local_sections[r_symndx];
- rel->r_addend += sec->output_offset + sym->st_value;
+#ifdef USE_REL
+ arm_add_to_rel (input_bfd, contents + rel->r_offset,
+ howto, sec->output_offset + sym->st_value);
+#else
+ rel->r_addend += (sec->output_offset + sym->st_value)
+ >> howto->rightshift;
+#endif
}
}
if (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak)
{
+ int relocation_needed = 1;
+
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_needed = 0;
+ break;
+
+ case R_ARM_GOTPC:
+ relocation_needed = 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_needed = 0;
+ break;
+
+ case R_ARM_PLT32:
+ if (h->plt.offset != (bfd_vma)-1)
+ relocation_needed = 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_needed = 0;
+ }
+ }
+
+ if (relocation_needed)
+ relocation = h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset;
+ else
+ relocation = 0;
}
else if (h->root.type == bfd_link_hash_undefweak)
relocation = 0;
+ else if (info->shared && !info->symbolic && !info->no_undefined)
+ relocation = 0;
else
{
if (!((*info->callbacks->undefined_symbol)
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->r_offset,
- relocation, rel->r_addend,
- info, sec, name,
+ input_section, contents, rel,
+ relocation, info, sec, name,
(h ? ELF_ST_TYPE (h->type) :
- ELF_ST_TYPE (sym->st_info)));
+ ELF_ST_TYPE (sym->st_info)), h);
if (r != bfd_reloc_ok)
{
flagword out_flags;
flagword in_flags;
- if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
+ 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;
+ in_flags = elf_elfheader (ibfd)->e_flags;
out_flags = elf_elfheader (obfd)->e_flags;
if (!elf_flags_init (obfd))
else
return type;
}
-
+
static asection *
elf32_arm_gc_mark_hook (abfd, info, rel, h, sym)
bfd *abfd;
- struct bfd_link_info *info;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
Elf_Internal_Rela *rel;
struct elf_link_hash_entry *h;
Elf_Internal_Sym *sym;
case bfd_link_hash_common:
return h->root.u.c.p->section;
+
+ default:
+ break;
}
}
}
return NULL;
}
+/* Update the got entry reference counts for the section being removed. */
+
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;
+ bfd *abfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info *info ATTRIBUTE_UNUSED;
+ asection *sec ATTRIBUTE_UNUSED;
+ const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
{
- /* we don't use got and plt entries for armelf */
+ /* We don't support garbage collection of GOT and PLT relocs yet. */
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. */
-
+/* Look through the relocs for a section during the first phase. */
+
static boolean
elf32_arm_check_relocs (abfd, info, sec, relocs)
- bfd *abfd;
- struct bfd_link_info *info;
- asection *sec;
- const Elf_Internal_Rela *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, **sym_hashes_end;
- const Elf_Internal_Rela *rel;
- const Elf_Internal_Rela *rel_end;
-
+ 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))
+ if (!_bfd_elf32_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. */
-boolean
+static boolean
elf32_arm_find_nearest_line
(abfd, section, symbols, offset, filename_ptr, functionname_ptr, line_ptr)
bfd * abfd;
asymbol ** p;
if (_bfd_dwarf2_find_nearest_line (abfd, section, symbols, offset,
- filename_ptr, functionname_ptr,
- line_ptr))
+ filename_ptr, functionname_ptr,
+ line_ptr, 0))
return true;
if (! _bfd_stab_section_find_nearest_line (abfd, symbols, section, offset,
functionname_ptr, line_ptr,
&elf_tdata (abfd)->line_info))
return false;
-
+
if (found)
return true;
*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 ATTRIBUTE_UNUSED;
+{
+ 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;
+}
+
+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;
+}
+
+
#define ELF_ARCH bfd_arch_arm
#define ELF_MACHINE_CODE EM_ARM
+#define ELF_MAXPAGESIZE 0x8000
+
-#define bfd_elf32_bfd_reloc_type_lookup elf32_arm_reloc_type_lookup
-#define elf_backend_relocate_section elf32_arm_relocate_section
#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_post_process_headers elf32_arm_post_process_headers
#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
+
+#define elf_backend_got_header_size 12
+#define elf_backend_plt_header_size PLT_ENTRY_SIZE
#include "elf32-target.h"
projects / deliverable / binutils-gdb.git / blobdiff