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cell-binutils  2.17cvs20070401
Classes | Defines | Functions | Variables
elf32-avr.c File Reference
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/avr.h"
#include "elf32-avr.h"
#include "elf32-target.h"

Go to the source code of this file.

Classes

struct  elf32_avr_stub_hash_entry
struct  avr_reloc_map

Defines

#define avr_link_hash_table(p)
#define avr_stub_hash_entry(ent)   ((struct elf32_avr_stub_hash_entry *)(ent))
#define avr_stub_hash_lookup(table, string, create, copy)
#define ADD_DUMMY_STUBS_FOR_DEBUGGING   0
#define ELF_ARCH   bfd_arch_avr
#define ELF_MACHINE_CODE   EM_AVR
#define ELF_MACHINE_ALT1   EM_AVR_OLD
#define ELF_MAXPAGESIZE   1
#define TARGET_LITTLE_SYM   bfd_elf32_avr_vec
#define TARGET_LITTLE_NAME   "elf32-avr"
#define bfd_elf32_bfd_link_hash_table_create   elf32_avr_link_hash_table_create
#define bfd_elf32_bfd_link_hash_table_free   elf32_avr_link_hash_table_free
#define elf_info_to_howto   avr_info_to_howto_rela
#define elf_info_to_howto_rel   NULL
#define elf_backend_relocate_section   elf32_avr_relocate_section
#define elf_backend_check_relocs   elf32_avr_check_relocs
#define elf_backend_can_gc_sections   1
#define elf_backend_rela_normal   1
#define elf_backend_final_write_processing   bfd_elf_avr_final_write_processing
#define elf_backend_object_p   elf32_avr_object_p
#define bfd_elf32_bfd_relax_section   elf32_avr_relax_section
#define bfd_elf32_bfd_get_relocated_section_contents   elf32_avr_get_relocated_section_contents

Functions

static struct bfd_hash_entrystub_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, const char *string)
static struct bfd_hash_entryelf32_avr_link_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, const char *string)
static struct bfd_link_hash_tableelf32_avr_link_hash_table_create (bfd *abfd)
static void elf32_avr_link_hash_table_free (struct bfd_link_hash_table *btab)
static int avr_relative_distance_considering_wrap_around (unsigned int distance)
static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, bfd_reloc_code_real_type code)
static reloc_howto_type * bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, const char *r_name)
static void avr_info_to_howto_rela (bfd *abfd ATTRIBUTE_UNUSED, arelent *cache_ptr, Elf_Internal_Rela *dst)
static bfd_boolean elf32_avr_check_relocs (bfd *abfd, struct bfd_link_info *info, asection *sec, const Elf_Internal_Rela *relocs)
static bfd_boolean avr_stub_is_required_for_16_bit_reloc (bfd_vma relocation)
static bfd_vma avr_get_stub_addr (bfd_vma srel, struct elf32_avr_link_hash_table *htab)
static bfd_reloc_status_type avr_final_link_relocate (reloc_howto_type *howto, bfd *input_bfd, asection *input_section, bfd_byte *contents, Elf_Internal_Rela *rel, bfd_vma relocation, struct elf32_avr_link_hash_table *htab)
static bfd_boolean elf32_avr_relocate_section (bfd *output_bfd ATTRIBUTE_UNUSED, 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)
static void bfd_elf_avr_final_write_processing (bfd *abfd, bfd_boolean linker ATTRIBUTE_UNUSED)
static bfd_boolean elf32_avr_object_p (bfd *abfd)
static bfd_boolean elf32_avr_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
static bfd_boolean elf32_avr_relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info, bfd_boolean *again)
static bfd_byteelf32_avr_get_relocated_section_contents (bfd *output_bfd, struct bfd_link_info *link_info, struct bfd_link_order *link_order, bfd_byte *data, bfd_boolean relocatable, asymbol **symbols)
static char * avr_stub_name (const asection *symbol_section, const bfd_vma symbol_offset, const Elf_Internal_Rela *rela)
static struct
elf32_avr_stub_hash_entry
avr_add_stub (const char *stub_name, struct elf32_avr_link_hash_table *htab)
static bfd_boolean avr_build_one_stub (struct bfd_hash_entry *bh, void *in_arg)
static bfd_boolean avr_mark_stub_not_to_be_necessary (struct bfd_hash_entry *bh, void *in_arg)
static bfd_boolean avr_size_one_stub (struct bfd_hash_entry *bh, void *in_arg)
void elf32_avr_setup_params (struct bfd_link_info *info, bfd *avr_stub_bfd, asection *avr_stub_section, bfd_boolean no_stubs, bfd_boolean deb_stubs, bfd_boolean deb_relax, bfd_vma pc_wrap_around, bfd_boolean call_ret_replacement)
int elf32_avr_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info)
static int get_local_syms (bfd *input_bfd, struct bfd_link_info *info)
bfd_boolean elf32_avr_size_stubs (bfd *output_bfd, struct bfd_link_info *info, bfd_boolean is_prealloc_run)
bfd_boolean elf32_avr_build_stubs (struct bfd_link_info *info)

Variables

static bfd_boolean debug_relax = FALSE
static bfd_boolean debug_stubs = FALSE
static reloc_howto_type elf_avr_howto_table []
static struct avr_reloc_map []
static bfd_vma avr_pc_wrap_around = 0x10000000
static int avr_replace_call_ret_sequences = 1

Class Documentation

struct elf32_avr_stub_hash_entry

Definition at line 49 of file elf32-avr.c.

Class Members
bfd_boolean is_actually_needed
bfd_vma stub_offset
bfd_vma target_value
struct elf32_avr_link_hash_table

Definition at line 65 of file elf32-avr.c.

Collaboration diagram for elf32_avr_link_hash_table:
Class Members
Elf_Internal_Sym ** all_local_syms
bfd_vma * amt_destination_addr
unsigned int amt_entry_cnt
unsigned int amt_max_entry_cnt
bfd_vma * amt_stub_offsets
unsigned int bfd_count
asection ** input_list
bfd_boolean no_stubs
bfd * stub_bfd
asection * stub_sec
int top_index
bfd_vma vector_base
struct avr_reloc_map

Definition at line 509 of file elf32-avr.c.

Class Members
bfd_reloc_code_real_type bfd_reloc_val
unsigned int elf_reloc_val

Define Documentation

Definition at line 2641 of file elf32-avr.c.

#define avr_link_hash_table (   p)
Value:
/* PR 3874: Check that we have an AVR style hash table before using it.  */\
  ((p)->hash->table.newfunc != elf32_avr_link_hash_newfunc ? NULL : \
   ((struct elf32_avr_link_hash_table *) ((p)->hash)))

Definition at line 105 of file elf32-avr.c.

#define avr_stub_hash_entry (   ent)    ((struct elf32_avr_stub_hash_entry *)(ent))

Definition at line 110 of file elf32-avr.c.

#define avr_stub_hash_lookup (   table,
  string,
  create,
  copy 
)
Value:
((struct elf32_avr_stub_hash_entry *) \
   bfd_hash_lookup ((table), (string), (create), (copy)))

Definition at line 113 of file elf32-avr.c.

Definition at line 2973 of file elf32-avr.c.

Definition at line 2959 of file elf32-avr.c.

Definition at line 2960 of file elf32-avr.c.

Definition at line 2972 of file elf32-avr.c.

#define ELF_ARCH   bfd_arch_avr

Definition at line 2951 of file elf32-avr.c.

Definition at line 2966 of file elf32-avr.c.

Definition at line 2965 of file elf32-avr.c.

Definition at line 2968 of file elf32-avr.c.

Definition at line 2970 of file elf32-avr.c.

#define elf_backend_rela_normal   1

Definition at line 2967 of file elf32-avr.c.

Definition at line 2964 of file elf32-avr.c.

Definition at line 2962 of file elf32-avr.c.

Definition at line 2963 of file elf32-avr.c.

Definition at line 2953 of file elf32-avr.c.

#define ELF_MACHINE_CODE   EM_AVR

Definition at line 2952 of file elf32-avr.c.

#define ELF_MAXPAGESIZE   1

Definition at line 2954 of file elf32-avr.c.

#define TARGET_LITTLE_NAME   "elf32-avr"

Definition at line 2957 of file elf32-avr.c.

Definition at line 2956 of file elf32-avr.c.


Function Documentation

static struct elf32_avr_stub_hash_entry* avr_add_stub ( const char *  stub_name,
struct elf32_avr_link_hash_table htab 
) [static, read]

Definition at line 2359 of file elf32-avr.c.

{
  struct elf32_avr_stub_hash_entry *hsh;

  /* Enter this entry into the linker stub hash table.  */
  hsh = avr_stub_hash_lookup (&htab->bstab, stub_name, TRUE, FALSE);

  if (hsh == NULL)
    {
      (*_bfd_error_handler) (_("%B: cannot create stub entry %s"),
                             NULL, stub_name);
      return NULL;
    }

  hsh->stub_offset = 0;
  return hsh;
}

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static bfd_boolean avr_build_one_stub ( struct bfd_hash_entry bh,
void *  in_arg 
) [static]

Definition at line 2387 of file elf32-avr.c.

{
  struct elf32_avr_stub_hash_entry *hsh;
  struct bfd_link_info *info;
  struct elf32_avr_link_hash_table *htab;
  bfd *stub_bfd;
  bfd_byte *loc;
  bfd_vma target;
  bfd_vma starget;

  /* Basic opcode */
  bfd_vma jmp_insn = 0x0000940c;

  /* Massage our args to the form they really have.  */
  hsh = avr_stub_hash_entry (bh);

  if (!hsh->is_actually_needed)
    return TRUE;

  info = (struct bfd_link_info *) in_arg;

  htab = avr_link_hash_table (info);
  if (htab == NULL)
    return FALSE;

  target = hsh->target_value;

  /* Make a note of the offset within the stubs for this entry.  */
  hsh->stub_offset = htab->stub_sec->size;
  loc = htab->stub_sec->contents + hsh->stub_offset;

  stub_bfd = htab->stub_sec->owner;

  if (debug_stubs)
    printf ("Building one Stub. Address: 0x%x, Offset: 0x%x\n",
             (unsigned int) target,
             (unsigned int) hsh->stub_offset);

  /* We now have to add the information on the jump target to the bare
     opcode bits already set in jmp_insn.  */

  /* Check for the alignment of the address.  */
  if (target & 1)
     return FALSE;

  starget = target >> 1;
  jmp_insn |= ((starget & 0x10000) | ((starget << 3) & 0x1f00000)) >> 16;
  bfd_put_16 (stub_bfd, jmp_insn, loc);
  bfd_put_16 (stub_bfd, (bfd_vma) starget & 0xffff, loc + 2);

  htab->stub_sec->size += 4;

  /* Now add the entries in the address mapping table if there is still
     space left.  */
  {
    unsigned int nr;

    nr = htab->amt_entry_cnt + 1;
    if (nr <= htab->amt_max_entry_cnt)
      {
        htab->amt_entry_cnt = nr;

        htab->amt_stub_offsets[nr - 1] = hsh->stub_offset;
        htab->amt_destination_addr[nr - 1] = target;
      }
  }

  return TRUE;
}

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static bfd_reloc_status_type avr_final_link_relocate ( reloc_howto_type *  howto,
bfd input_bfd,
asection input_section,
bfd_byte contents,
Elf_Internal_Rela rel,
bfd_vma  relocation,
struct elf32_avr_link_hash_table htab 
) [static]

Definition at line 798 of file elf32-avr.c.

{
  bfd_reloc_status_type r = bfd_reloc_ok;
  bfd_vma               x;
  bfd_signed_vma     srel;
  bfd_signed_vma     reloc_addr;
  bfd_boolean           use_stubs = FALSE;
  /* Usually is 0, unless we are generating code for a bootloader.  */
  bfd_signed_vma        base_addr = htab->vector_base;

  /* Absolute addr of the reloc in the final excecutable.  */
  reloc_addr = rel->r_offset + input_section->output_section->vma
              + input_section->output_offset;

  switch (howto->type)
    {
    case R_AVR_7_PCREL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      srel -= 2;     /* Branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
              input_section->output_offset);

      if (srel & 1)
       return bfd_reloc_outofrange;
      if (srel > ((1 << 7) - 1) || (srel < - (1 << 7)))
       return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xfc07) | (((srel >> 1) << 3) & 0x3f8);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_13_PCREL:
      contents   += rel->r_offset;
      srel = (bfd_signed_vma) relocation;
      srel += rel->r_addend;
      srel -= rel->r_offset;
      srel -= 2;     /* Branch instructions add 2 to the PC...  */
      srel -= (input_section->output_section->vma +
              input_section->output_offset);

      if (srel & 1)
       return bfd_reloc_outofrange;

      srel = avr_relative_distance_considering_wrap_around (srel);

      /* AVR addresses commands as words.  */
      srel >>= 1;

      /* Check for overflow.  */
      if (srel < -2048 || srel > 2047)
       {
          /* Relative distance is too large.  */

         /* Always apply WRAPAROUND for avr2 and avr4.  */
         switch (bfd_get_mach (input_bfd))
           {
           case bfd_mach_avr2:
           case bfd_mach_avr4:
             break;

           default:
             return bfd_reloc_overflow;
           }
       }

      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf000) | (srel & 0xfff);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (((srel > 0) && (srel & 0xffff) > 255)
         || ((srel < 0) && ((-srel) & 0xffff) > 128))
        /* Remove offset for data/eeprom section.  */
        return bfd_reloc_overflow;

      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_6:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (((srel & 0xffff) > 63) || (srel < 0))
       /* Remove offset for data/eeprom section.  */
       return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xd3f8) | ((srel & 7) | ((srel & (3 << 3)) << 7)
                       | ((srel & (1 << 5)) << 8));
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_6_ADIW:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (((srel & 0xffff) > 63) || (srel < 0))
       /* Remove offset for data/eeprom section.  */
       return bfd_reloc_overflow;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xff30) | (srel & 0xf) | ((srel & 0x30) << 2);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_MS8_LDI:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = (srel >> 24) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_MS8_LDI_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      srel = (srel >> 24) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_GS:
      use_stubs = (!htab->no_stubs);
      /* Fall through.  */
    case R_AVR_LO8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;

      if (use_stubs
          && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
        {
          bfd_vma old_srel = srel;

          /* We need to use the address of the stub instead.  */
          srel = avr_get_stub_addr (srel, htab);
          if (debug_stubs)
            printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
                    "reloc at address 0x%x.\n",
                    (unsigned int) srel,
                    (unsigned int) old_srel,
                    (unsigned int) reloc_addr);

         if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
           return bfd_reloc_outofrange;
        }

      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_GS:
      use_stubs = (!htab->no_stubs);
      /* Fall through.  */
    case R_AVR_HI8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;

      if (use_stubs
          && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
        {
          bfd_vma old_srel = srel;

          /* We need to use the address of the stub instead.  */
          srel = avr_get_stub_addr (srel, htab);
          if (debug_stubs)
            printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
                    "reloc at address 0x%x.\n",
                    (unsigned int) srel,
                    (unsigned int) old_srel,
                    (unsigned int) reloc_addr);

         if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
           return bfd_reloc_outofrange;
        }

      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_PM:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_LO8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HI8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 8) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_HH8_LDI_PM_NEG:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      srel = -srel;
      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      srel = (srel >> 16) & 0xff;
      x = bfd_get_16 (input_bfd, contents);
      x = (x & 0xf0f0) | (srel & 0xf) | ((srel << 4) & 0xf00);
      bfd_put_16 (input_bfd, x, contents);
      break;

    case R_AVR_CALL:
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;
      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      x = bfd_get_16 (input_bfd, contents);
      x |= ((srel & 0x10000) | ((srel << 3) & 0x1f00000)) >> 16;
      bfd_put_16 (input_bfd, x, contents);
      bfd_put_16 (input_bfd, (bfd_vma) srel & 0xffff, contents+2);
      break;

    case R_AVR_16_PM:
      use_stubs = (!htab->no_stubs);
      contents += rel->r_offset;
      srel = (bfd_signed_vma) relocation + rel->r_addend;

      if (use_stubs
          && avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
        {
          bfd_vma old_srel = srel;

          /* We need to use the address of the stub instead.  */
          srel = avr_get_stub_addr (srel,htab);
          if (debug_stubs)
            printf ("LD: Using jump stub (at 0x%x) with destination 0x%x for "
                    "reloc at address 0x%x.\n",
                    (unsigned int) srel,
                    (unsigned int) old_srel,
                    (unsigned int) reloc_addr);

         if (avr_stub_is_required_for_16_bit_reloc (srel - base_addr))
           return bfd_reloc_outofrange;
        }

      if (srel & 1)
       return bfd_reloc_outofrange;
      srel = srel >> 1;
      bfd_put_16 (input_bfd, (bfd_vma) srel &0x00ffff, contents);
      break;

    default:
      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                contents, rel->r_offset,
                                relocation, rel->r_addend);
    }

  return r;
}

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static bfd_vma avr_get_stub_addr ( bfd_vma  srel,
struct elf32_avr_link_hash_table htab 
) [static]

Definition at line 778 of file elf32-avr.c.

{
  unsigned int index;
  bfd_vma stub_sec_addr =
              (htab->stub_sec->output_section->vma +
              htab->stub_sec->output_offset);

  for (index = 0; index < htab->amt_max_entry_cnt; index ++)
    if (htab->amt_destination_addr[index] == srel)
      return htab->amt_stub_offsets[index] + stub_sec_addr;

  /* Return an address that could not be reached by 16 bit relocs.  */
  return 0x020000;
}

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static void avr_info_to_howto_rela ( bfd *abfd  ATTRIBUTE_UNUSED,
arelent cache_ptr,
Elf_Internal_Rela dst 
) [static]

Definition at line 710 of file elf32-avr.c.

{
  unsigned int r_type;

  r_type = ELF32_R_TYPE (dst->r_info);
  BFD_ASSERT (r_type < (unsigned int) R_AVR_max);
  cache_ptr->howto = &elf_avr_howto_table[r_type];
}
static bfd_boolean avr_mark_stub_not_to_be_necessary ( struct bfd_hash_entry bh,
void *  in_arg 
) [static]

Definition at line 2458 of file elf32-avr.c.

{
  struct elf32_avr_stub_hash_entry *hsh;
  struct elf32_avr_link_hash_table *htab;

  htab = in_arg;
  hsh = avr_stub_hash_entry (bh);
  hsh->is_actually_needed = FALSE;

  return TRUE;
}

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Definition at line 664 of file elf32-avr.c.

{
  unsigned int wrap_around_mask = avr_pc_wrap_around - 1;
  int dist_with_wrap_around = distance & wrap_around_mask;

  if (dist_with_wrap_around > ((int) (avr_pc_wrap_around >> 1)))
    dist_with_wrap_around -= avr_pc_wrap_around;

  return dist_with_wrap_around;
}

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static bfd_boolean avr_size_one_stub ( struct bfd_hash_entry bh,
void *  in_arg 
) [static]

Definition at line 2472 of file elf32-avr.c.

{
  struct elf32_avr_stub_hash_entry *hsh;
  struct elf32_avr_link_hash_table *htab;
  int size;

  /* Massage our args to the form they really have.  */
  hsh = avr_stub_hash_entry (bh);
  htab = in_arg;

  if (hsh->is_actually_needed)
    size = 4;
  else
    size = 0;

  htab->stub_sec->size += size;
  return TRUE;
}

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Definition at line 767 of file elf32-avr.c.

{
  return (relocation >= 0x020000);
}

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static char* avr_stub_name ( const asection symbol_section,
const bfd_vma  symbol_offset,
const Elf_Internal_Rela rela 
) [static]

Definition at line 2337 of file elf32-avr.c.

{
  char *stub_name;
  bfd_size_type len;

  len = 8 + 1 + 8 + 1 + 1;
  stub_name = bfd_malloc (len);

  sprintf (stub_name, "%08x+%08x",
           symbol_section->id & 0xffffffff,
           (unsigned int) ((rela->r_addend & 0xffffffff) + symbol_offset));

  return stub_name;
}

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static reloc_howto_type* bfd_elf32_bfd_reloc_name_lookup ( bfd *abfd  ATTRIBUTE_UNUSED,
const char *  r_name 
) [static]

Definition at line 692 of file elf32-avr.c.

{
  unsigned int i;

  for (i = 0;
       i < sizeof (elf_avr_howto_table) / sizeof (elf_avr_howto_table[0]);
       i++)
    if (elf_avr_howto_table[i].name != NULL
       && strcasecmp (elf_avr_howto_table[i].name, r_name) == 0)
      return &elf_avr_howto_table[i];

  return NULL;
}

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static reloc_howto_type* bfd_elf32_bfd_reloc_type_lookup ( bfd *abfd  ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type  code 
) [static]

Definition at line 677 of file elf32-avr.c.

{
  unsigned int i;

  for (i = 0;
       i < sizeof (avr_reloc_map) / sizeof (struct avr_reloc_map);
       i++)
    if (avr_reloc_map[i].bfd_reloc_val == code)
      return &elf_avr_howto_table[avr_reloc_map[i].elf_reloc_val];

  return NULL;
}
static void bfd_elf_avr_final_write_processing ( bfd abfd,
bfd_boolean linker  ATTRIBUTE_UNUSED 
) [static]

Definition at line 1286 of file elf32-avr.c.

{
  unsigned long val;

  switch (bfd_get_mach (abfd))
    {
    default:
    case bfd_mach_avr2:
      val = E_AVR_MACH_AVR2;
      break;

    case bfd_mach_avr1:
      val = E_AVR_MACH_AVR1;
      break;

    case bfd_mach_avr3:
      val = E_AVR_MACH_AVR3;
      break;

    case bfd_mach_avr4:
      val = E_AVR_MACH_AVR4;
      break;

    case bfd_mach_avr5:
      val = E_AVR_MACH_AVR5;
      break;

    case bfd_mach_avr6:
      val = E_AVR_MACH_AVR6;
      break;
    }

  elf_elfheader (abfd)->e_machine = EM_AVR;
  elf_elfheader (abfd)->e_flags &= ~ EF_AVR_MACH;
  elf_elfheader (abfd)->e_flags |= val;
  elf_elfheader (abfd)->e_flags |= EF_AVR_LINKRELAX_PREPARED;
}

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Definition at line 2902 of file elf32-avr.c.

{
  asection *stub_sec;
  struct bfd_hash_table *table;
  struct elf32_avr_link_hash_table *htab;
  bfd_size_type total_size = 0;

  htab = avr_link_hash_table (info);
  if (htab == NULL)
    return FALSE;

  /* In case that there were several stub sections:  */
  for (stub_sec = htab->stub_bfd->sections;
       stub_sec != NULL;
       stub_sec = stub_sec->next)
    {
      bfd_size_type size;

      /* Allocate memory to hold the linker stubs.  */
      size = stub_sec->size;
      total_size += size;

      stub_sec->contents = bfd_zalloc (htab->stub_bfd, size);
      if (stub_sec->contents == NULL && size != 0)
       return FALSE;
      stub_sec->size = 0;
    }

  /* Allocate memory for the adress mapping table.  */
  htab->amt_entry_cnt = 0;
  htab->amt_max_entry_cnt = total_size / 4;
  htab->amt_stub_offsets = bfd_malloc (sizeof (bfd_vma)
                                       * htab->amt_max_entry_cnt);
  htab->amt_destination_addr = bfd_malloc (sizeof (bfd_vma)
                                      * htab->amt_max_entry_cnt );

  if (debug_stubs)
    printf ("Allocating %i entries in the AMT\n", htab->amt_max_entry_cnt);

  /* Build the stubs as directed by the stub hash table.  */
  table = &htab->bstab;
  bfd_hash_traverse (table, avr_build_one_stub, info);

  if (debug_stubs)
    printf ("Final Stub section Size: %i\n", (int) htab->stub_sec->size);

  return TRUE;
}

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static bfd_boolean elf32_avr_check_relocs ( bfd abfd,
struct bfd_link_info info,
asection sec,
const Elf_Internal_Rela relocs 
) [static]

Definition at line 726 of file elf32-avr.c.

{
  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;

  if (info->relocatable)
    return TRUE;

  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];
         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;
       }
    }

  return TRUE;
}
static bfd_byte* elf32_avr_get_relocated_section_contents ( bfd output_bfd,
struct bfd_link_info link_info,
struct bfd_link_order link_order,
bfd_byte data,
bfd_boolean  relocatable,
asymbol **  symbols 
) [static]

Definition at line 2230 of file elf32-avr.c.

{
  Elf_Internal_Shdr *symtab_hdr;
  asection *input_section = link_order->u.indirect.section;
  bfd *input_bfd = input_section->owner;
  asection **sections = NULL;
  Elf_Internal_Rela *internal_relocs = NULL;
  Elf_Internal_Sym *isymbuf = NULL;

  /* We only need to handle the case of relaxing, or of having a
     particular set of section contents, specially.  */
  if (relocatable
      || elf_section_data (input_section)->this_hdr.contents == NULL)
    return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
                                                       link_order, data,
                                                       relocatable,
                                                       symbols);
  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;

  memcpy (data, elf_section_data (input_section)->this_hdr.contents,
          (size_t) input_section->size);

  if ((input_section->flags & SEC_RELOC) != 0
      && input_section->reloc_count > 0)
    {
      asection **secpp;
      Elf_Internal_Sym *isym, *isymend;
      bfd_size_type amt;

      internal_relocs = (_bfd_elf_link_read_relocs
                         (input_bfd, input_section, NULL, NULL, FALSE));
      if (internal_relocs == NULL)
        goto error_return;

      if (symtab_hdr->sh_info != 0)
        {
          isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
          if (isymbuf == NULL)
            isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
                                            symtab_hdr->sh_info, 0,
                                            NULL, NULL, NULL);
          if (isymbuf == NULL)
            goto error_return;
        }

      amt = symtab_hdr->sh_info;
      amt *= sizeof (asection *);
      sections = bfd_malloc (amt);
      if (sections == NULL && amt != 0)
        goto error_return;

      isymend = isymbuf + symtab_hdr->sh_info;
      for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
        {
          asection *isec;

          if (isym->st_shndx == SHN_UNDEF)
            isec = bfd_und_section_ptr;
          else if (isym->st_shndx == SHN_ABS)
            isec = bfd_abs_section_ptr;
          else if (isym->st_shndx == SHN_COMMON)
            isec = bfd_com_section_ptr;
          else
            isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);

          *secpp = isec;
        }

      if (! elf32_avr_relocate_section (output_bfd, link_info, input_bfd,
                                        input_section, data, internal_relocs,
                                        isymbuf, sections))
        goto error_return;

      if (sections != NULL)
        free (sections);
      if (isymbuf != NULL
          && symtab_hdr->contents != (unsigned char *) isymbuf)
        free (isymbuf);
      if (elf_section_data (input_section)->relocs != internal_relocs)
        free (internal_relocs);
    }

  return data;

 error_return:
  if (sections != NULL)
    free (sections);
  if (isymbuf != NULL
      && symtab_hdr->contents != (unsigned char *) isymbuf)
    free (isymbuf);
  if (internal_relocs != NULL
      && elf_section_data (input_section)->relocs != internal_relocs)
    free (internal_relocs);
  return NULL;
}

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static struct bfd_hash_entry* elf32_avr_link_hash_newfunc ( struct bfd_hash_entry entry,
struct bfd_hash_table table,
const char *  string 
) [static, read]

Definition at line 597 of file elf32-avr.c.

{
  return _bfd_elf_link_hash_newfunc (entry, table, string);
}

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static struct bfd_link_hash_table* elf32_avr_link_hash_table_create ( bfd abfd) [static, read]

Definition at line 609 of file elf32-avr.c.

{
  struct elf32_avr_link_hash_table *htab;
  bfd_size_type amt = sizeof (*htab);

  htab = bfd_malloc (amt);
  if (htab == NULL)
    return NULL;

  if (!_bfd_elf_link_hash_table_init (&htab->etab, abfd,
                                      elf32_avr_link_hash_newfunc,
                                      sizeof (struct elf_link_hash_entry)))
    {
      free (htab);
      return NULL;
    }

  /* Init the stub hash table too.  */
  if (!bfd_hash_table_init (&htab->bstab, stub_hash_newfunc,
                            sizeof (struct elf32_avr_stub_hash_entry)))
    return NULL;

  htab->stub_bfd = NULL;
  htab->stub_sec = NULL;

  /* Initialize the address mapping table.  */
  htab->amt_stub_offsets = NULL;
  htab->amt_destination_addr = NULL;
  htab->amt_entry_cnt = 0;
  htab->amt_max_entry_cnt = 0;

  return &htab->etab.root;
}

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static void elf32_avr_link_hash_table_free ( struct bfd_link_hash_table btab) [static]

Definition at line 646 of file elf32-avr.c.

{
  struct elf32_avr_link_hash_table *htab
    = (struct elf32_avr_link_hash_table *) btab;

  /* Free the address mapping table.  */
  if (htab->amt_stub_offsets != NULL)
    free (htab->amt_stub_offsets);
  if (htab->amt_destination_addr != NULL)
    free (htab->amt_destination_addr);

  bfd_hash_table_free (&htab->bstab);
  _bfd_generic_link_hash_table_free (btab);
}

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static bfd_boolean elf32_avr_object_p ( bfd abfd) [static]

Definition at line 1328 of file elf32-avr.c.

{
  unsigned int e_set = bfd_mach_avr2;

  if (elf_elfheader (abfd)->e_machine == EM_AVR
      || elf_elfheader (abfd)->e_machine == EM_AVR_OLD)
    {
      int e_mach = elf_elfheader (abfd)->e_flags & EF_AVR_MACH;

      switch (e_mach)
       {
       default:
       case E_AVR_MACH_AVR2:
         e_set = bfd_mach_avr2;
         break;

       case E_AVR_MACH_AVR1:
         e_set = bfd_mach_avr1;
         break;

       case E_AVR_MACH_AVR3:
         e_set = bfd_mach_avr3;
         break;

       case E_AVR_MACH_AVR4:
         e_set = bfd_mach_avr4;
         break;

       case E_AVR_MACH_AVR5:
         e_set = bfd_mach_avr5;
         break;

       case E_AVR_MACH_AVR6:
         e_set = bfd_mach_avr6;
         break;
       }
    }
  return bfd_default_set_arch_mach (abfd, bfd_arch_avr,
                                e_set);
}

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static bfd_boolean elf32_avr_relax_delete_bytes ( bfd abfd,
asection sec,
bfd_vma  addr,
int  count 
) [static]

Definition at line 1376 of file elf32-avr.c.

{
  Elf_Internal_Shdr *symtab_hdr;
  unsigned int sec_shndx;
  bfd_byte *contents;
  Elf_Internal_Rela *irel, *irelend;
  Elf_Internal_Rela *irelalign;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymbuf = NULL;
  Elf_Internal_Sym *isymend;
  bfd_vma toaddr;
  struct elf_link_hash_entry **sym_hashes;
  struct elf_link_hash_entry **end_hashes;
  unsigned int symcount;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
  contents = elf_section_data (sec)->this_hdr.contents;

  /* The deletion must stop at the next ALIGN reloc for an aligment
     power larger than the number of bytes we are deleting.  */

  irelalign = NULL;
  toaddr = sec->size;

  irel = elf_section_data (sec)->relocs;
  irelend = irel + sec->reloc_count;

  /* Actually delete the bytes.  */
  if (toaddr - addr - count > 0)
    memmove (contents + addr, contents + addr + count,
             (size_t) (toaddr - addr - count));
  sec->size -= count;

  /* Adjust all the reloc addresses.  */
  for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
    {
      bfd_vma old_reloc_address;
      bfd_vma shrinked_insn_address;

      old_reloc_address = (sec->output_section->vma
                           + sec->output_offset + irel->r_offset);
      shrinked_insn_address = (sec->output_section->vma
                              + sec->output_offset + addr - count);

      /* Get the new reloc address.  */
      if ((irel->r_offset > addr
           && irel->r_offset < toaddr))
        {
          if (debug_relax)
            printf ("Relocation at address 0x%x needs to be moved.\n"
                    "Old section offset: 0x%x, New section offset: 0x%x \n",
                    (unsigned int) old_reloc_address,
                    (unsigned int) irel->r_offset,
                    (unsigned int) ((irel->r_offset) - count));

          irel->r_offset -= count;
        }

    }

   /* The reloc's own addresses are now ok. However, we need to readjust
      the reloc's addend, i.e. the reloc's value if two conditions are met:
      1.) the reloc is relative to a symbol in this section that
          is located in front of the shrinked instruction
      2.) symbol plus addend end up behind the shrinked instruction.

      The most common case where this happens are relocs relative to
      the section-start symbol.

      This step needs to be done for all of the sections of the bfd.  */

  {
    struct bfd_section *isec;

    for (isec = abfd->sections; isec; isec = isec->next)
     {
       bfd_vma symval;
       bfd_vma shrinked_insn_address;

       shrinked_insn_address = (sec->output_section->vma
                                + sec->output_offset + addr - count);

       irelend = elf_section_data (isec)->relocs + isec->reloc_count;
       for (irel = elf_section_data (isec)->relocs;
            irel < irelend;
            irel++)
         {
           /* Read this BFD's local symbols if we haven't done
              so already.  */
           if (isymbuf == NULL && symtab_hdr->sh_info != 0)
             {
               isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
               if (isymbuf == NULL)
                 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
                                                 symtab_hdr->sh_info, 0,
                                                 NULL, NULL, NULL);
               if (isymbuf == NULL)
                 return FALSE;
             }

           /* Get the value of the symbol referred to by the reloc.  */
           if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
             {
               /* A local symbol.  */
               Elf_Internal_Sym *isym;
               asection *sym_sec;

               isym = isymbuf + ELF32_R_SYM (irel->r_info);
               sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
               symval = isym->st_value;
               /* If the reloc is absolute, it will not have
                  a symbol or section associated with it.  */
               if (sym_sec == sec)
                 {
                   symval += sym_sec->output_section->vma
                             + sym_sec->output_offset;

                   if (debug_relax)
                     printf ("Checking if the relocation's "
                             "addend needs corrections.\n"
                             "Address of anchor symbol: 0x%x \n"
                             "Address of relocation target: 0x%x \n"
                             "Address of relaxed insn: 0x%x \n",
                             (unsigned int) symval,
                             (unsigned int) (symval + irel->r_addend),
                             (unsigned int) shrinked_insn_address);

                   if (symval <= shrinked_insn_address
                       && (symval + irel->r_addend) > shrinked_insn_address)
                     {
                       irel->r_addend -= count;

                       if (debug_relax)
                         printf ("Relocation's addend needed to be fixed \n");
                     }
                 }
              /* else...Reference symbol is absolute.  No adjustment needed.  */
            }
          /* else...Reference symbol is extern.  No need for adjusting
             the addend.  */
        }
     }
  }

  /* Adjust the local symbols defined in this section.  */
  isym = (Elf_Internal_Sym *) symtab_hdr->contents;
  isymend = isym + symtab_hdr->sh_info;
  for (; isym < isymend; isym++)
    {
      if (isym->st_shndx == sec_shndx
          && isym->st_value > addr
          && isym->st_value < toaddr)
        isym->st_value -= count;
    }

  /* Now adjust the global symbols defined in this section.  */
  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
              - symtab_hdr->sh_info);
  sym_hashes = elf_sym_hashes (abfd);
  end_hashes = sym_hashes + symcount;
  for (; sym_hashes < end_hashes; sym_hashes++)
    {
      struct elf_link_hash_entry *sym_hash = *sym_hashes;
      if ((sym_hash->root.type == bfd_link_hash_defined
           || sym_hash->root.type == bfd_link_hash_defweak)
          && sym_hash->root.u.def.section == sec
          && sym_hash->root.u.def.value > addr
          && sym_hash->root.u.def.value < toaddr)
        {
          sym_hash->root.u.def.value -= count;
        }
    }

  return TRUE;
}

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static bfd_boolean elf32_avr_relax_section ( bfd abfd,
asection sec,
struct bfd_link_info link_info,
bfd_boolean again 
) [static]

Definition at line 1588 of file elf32-avr.c.

{
  Elf_Internal_Shdr *symtab_hdr;
  Elf_Internal_Rela *internal_relocs;
  Elf_Internal_Rela *irel, *irelend;
  bfd_byte *contents = NULL;
  Elf_Internal_Sym *isymbuf = NULL;
  static asection *last_input_section = NULL;
  static Elf_Internal_Rela *last_reloc = NULL;
  struct elf32_avr_link_hash_table *htab;

  htab = avr_link_hash_table (link_info);
  if (htab == NULL)
    return FALSE;

  /* Assume nothing changes.  */
  *again = FALSE;

  if ((!htab->no_stubs) && (sec == htab->stub_sec))
    {
      /* We are just relaxing the stub section.
        Let's calculate the size needed again.  */
      bfd_size_type last_estimated_stub_section_size = htab->stub_sec->size;

      if (debug_relax)
        printf ("Relaxing the stub section. Size prior to this pass: %i\n",
                (int) last_estimated_stub_section_size);

      elf32_avr_size_stubs (htab->stub_sec->output_section->owner,
                            link_info, FALSE);

      /* Check if the number of trampolines changed.  */
      if (last_estimated_stub_section_size != htab->stub_sec->size)
        *again = TRUE;

      if (debug_relax)
        printf ("Size of stub section after this pass: %i\n",
                (int) htab->stub_sec->size);

      return TRUE;
    }

  /* We don't have to do anything for a relocatable link, if
     this section does not have relocs, or if this is not a
     code section.  */
  if (link_info->relocatable
      || (sec->flags & SEC_RELOC) == 0
      || sec->reloc_count == 0
      || (sec->flags & SEC_CODE) == 0)
    return TRUE;

  /* Check if the object file to relax uses internal symbols so that we
     could fix up the relocations.  */
  if (!(elf_elfheader (abfd)->e_flags & EF_AVR_LINKRELAX_PREPARED))
    return TRUE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;

  /* Get a copy of the native relocations.  */
  internal_relocs = (_bfd_elf_link_read_relocs
                     (abfd, sec, NULL, NULL, link_info->keep_memory));
  if (internal_relocs == NULL)
    goto error_return;

  if (sec != last_input_section)
    last_reloc = NULL;

  last_input_section = sec;

  /* Walk through the relocs looking for relaxing opportunities.  */
  irelend = internal_relocs + sec->reloc_count;
  for (irel = internal_relocs; irel < irelend; irel++)
    {
      bfd_vma symval;

      if (   ELF32_R_TYPE (irel->r_info) != R_AVR_13_PCREL
          && ELF32_R_TYPE (irel->r_info) != R_AVR_7_PCREL
          && ELF32_R_TYPE (irel->r_info) != R_AVR_CALL)
        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.  */
              if (! bfd_malloc_and_get_section (abfd, sec, &contents))
                goto error_return;
            }
        }

     /* Read this BFD's local symbols if we haven't done so already.  */
      if (isymbuf == NULL && symtab_hdr->sh_info != 0)
        {
          isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
          if (isymbuf == NULL)
            isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
                                            symtab_hdr->sh_info, 0,
                                            NULL, NULL, NULL);
          if (isymbuf == NULL)
            goto error_return;
        }


      /* Get the value of the symbol referred to by the reloc.  */
      if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
        {
          /* A local symbol.  */
          Elf_Internal_Sym *isym;
          asection *sym_sec;

          isym = isymbuf + ELF32_R_SYM (irel->r_info);
          sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
          symval = isym->st_value;
          /* If the reloc is absolute, it will not have
             a symbol or section associated with it.  */
          if (sym_sec)
            symval += sym_sec->output_section->vma
              + sym_sec->output_offset;
        }
      else
        {
          unsigned long indx;
          struct elf_link_hash_entry *h;

          /* An external symbol.  */
          indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
          h = elf_sym_hashes (abfd)[indx];
          BFD_ASSERT (h != NULL);
          if (h->root.type != bfd_link_hash_defined
              && h->root.type != bfd_link_hash_defweak)
           /* This appears to be a reference to an undefined
              symbol.  Just ignore it--it will be caught by the
              regular reloc processing.  */
           continue;

          symval = (h->root.u.def.value
                    + h->root.u.def.section->output_section->vma
                    + h->root.u.def.section->output_offset);
        }

      /* For simplicity of coding, we are going to modify the section
         contents, the section relocs, and the BFD symbol table.  We
         must tell the rest of the code not to free up this
         information.  It would be possible to instead create a table
         of changes which have to be made, as is done in coff-mips.c;
         that would be more work, but would require less memory when
         the linker is run.  */
      switch (ELF32_R_TYPE (irel->r_info))
        {
         /* Try to turn a 22-bit absolute call/jump into an 13-bit
            pc-relative rcall/rjmp.  */
         case R_AVR_CALL:
          {
            bfd_vma value = symval + irel->r_addend;
            bfd_vma dot, gap;
            int distance_short_enough = 0;

            /* Get the address of this instruction.  */
            dot = (sec->output_section->vma
                   + sec->output_offset + irel->r_offset);

            /* Compute the distance from this insn to the branch target.  */
            gap = value - dot;

            /* If the distance is within -4094..+4098 inclusive, then we can
               relax this jump/call.  +4098 because the call/jump target
               will be closer after the relaxation.  */
            if ((int) gap >= -4094 && (int) gap <= 4098)
              distance_short_enough = 1;

            /* Here we handle the wrap-around case.  E.g. for a 16k device
               we could use a rjmp to jump from address 0x100 to 0x3d00!
               In order to make this work properly, we need to fill the
               vaiable avr_pc_wrap_around with the appropriate value.
               I.e. 0x4000 for a 16k device.  */
            {
               /* Shrinking the code size makes the gaps larger in the
                  case of wrap-arounds.  So we use a heuristical safety
                  margin to avoid that during relax the distance gets
                  again too large for the short jumps.  Let's assume
                  a typical code-size reduction due to relax for a
                  16k device of 600 bytes.  So let's use twice the
                  typical value as safety margin.  */
               int rgap;
               int safety_margin;

               int assumed_shrink = 600;
               if (avr_pc_wrap_around > 0x4000)
                 assumed_shrink = 900;

               safety_margin = 2 * assumed_shrink;

               rgap = avr_relative_distance_considering_wrap_around (gap);

               if (rgap >= (-4092 + safety_margin)
                   && rgap <= (4094 - safety_margin))
               distance_short_enough = 1;
            }

            if (distance_short_enough)
              {
                unsigned char code_msb;
                unsigned char code_lsb;

                if (debug_relax)
                  printf ("shrinking jump/call instruction at address 0x%x"
                          " in section %s\n\n",
                          (int) dot, sec->name);

                /* Note that we've changed the relocs, section contents,
                   etc.  */
                elf_section_data (sec)->relocs = internal_relocs;
                elf_section_data (sec)->this_hdr.contents = contents;
                symtab_hdr->contents = (unsigned char *) isymbuf;

                /* Get the instruction code for relaxing.  */
                code_lsb = bfd_get_8 (abfd, contents + irel->r_offset);
                code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);

                /* Mask out the relocation bits.  */
                code_msb &= 0x94;
                code_lsb &= 0x0E;
                if (code_msb == 0x94 && code_lsb == 0x0E)
                  {
                    /* we are changing call -> rcall .  */
                    bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
                    bfd_put_8 (abfd, 0xD0, contents + irel->r_offset + 1);
                  }
                else if (code_msb == 0x94 && code_lsb == 0x0C)
                  {
                    /* we are changeing jump -> rjmp.  */
                    bfd_put_8 (abfd, 0x00, contents + irel->r_offset);
                    bfd_put_8 (abfd, 0xC0, contents + irel->r_offset + 1);
                  }
                else
                  abort ();

                /* Fix the relocation's type.  */
                irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
                                             R_AVR_13_PCREL);

                /* Check for the vector section. There we don't want to
                   modify the ordering!  */

                if (!strcmp (sec->name,".vectors")
                    || !strcmp (sec->name,".jumptables"))
                  {
                    /* Let's insert a nop.  */
                    bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 2);
                    bfd_put_8 (abfd, 0x00, contents + irel->r_offset + 3);
                  }
                else
                  {
                    /* Delete two bytes of data.  */
                    if (!elf32_avr_relax_delete_bytes (abfd, sec,
                                                       irel->r_offset + 2, 2))
                      goto error_return;

                    /* That will change things, so, we should relax again.
                       Note that this is not required, and it may be slow.  */
                    *again = TRUE;
                  }
              }
          }

        default:
          {
            unsigned char code_msb;
            unsigned char code_lsb;
            bfd_vma dot;

            code_msb = bfd_get_8 (abfd, contents + irel->r_offset + 1);
            code_lsb = bfd_get_8 (abfd, contents + irel->r_offset + 0);

            /* Get the address of this instruction.  */
            dot = (sec->output_section->vma
                   + sec->output_offset + irel->r_offset);

            /* Here we look for rcall/ret or call/ret sequences that could be
               safely replaced by rjmp/ret or jmp/ret.  */
            if (((code_msb & 0xf0) == 0xd0)
                && avr_replace_call_ret_sequences)
              {
                /* This insn is a rcall.  */
                unsigned char next_insn_msb = 0;
                unsigned char next_insn_lsb = 0;

                if (irel->r_offset + 3 < sec->size)
                  {
                    next_insn_msb =
                        bfd_get_8 (abfd, contents + irel->r_offset + 3);
                    next_insn_lsb =
                        bfd_get_8 (abfd, contents + irel->r_offset + 2);
                  }

              if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
                  {
                    /* The next insn is a ret. We now convert the rcall insn
                       into a rjmp instruction.  */
                    code_msb &= 0xef;
                    bfd_put_8 (abfd, code_msb, contents + irel->r_offset + 1);
                    if (debug_relax)
                      printf ("converted rcall/ret sequence at address 0x%x"
                              " into rjmp/ret sequence. Section is %s\n\n",
                              (int) dot, sec->name);
                    *again = TRUE;
                    break;
                  }
              }
            else if ((0x94 == (code_msb & 0xfe))
                   && (0x0e == (code_lsb & 0x0e))
                   && avr_replace_call_ret_sequences)
              {
                /* This insn is a call.  */
                unsigned char next_insn_msb = 0;
                unsigned char next_insn_lsb = 0;

                if (irel->r_offset + 5 < sec->size)
                  {
                    next_insn_msb =
                        bfd_get_8 (abfd, contents + irel->r_offset + 5);
                    next_insn_lsb =
                        bfd_get_8 (abfd, contents + irel->r_offset + 4);
                  }

                if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
                  {
                    /* The next insn is a ret. We now convert the call insn
                       into a jmp instruction.  */

                    code_lsb &= 0xfd;
                    bfd_put_8 (abfd, code_lsb, contents + irel->r_offset);
                    if (debug_relax)
                      printf ("converted call/ret sequence at address 0x%x"
                              " into jmp/ret sequence. Section is %s\n\n",
                              (int) dot, sec->name);
                    *again = TRUE;
                    break;
                  }
              }
            else if ((0xc0 == (code_msb & 0xf0))
                     || ((0x94 == (code_msb & 0xfe))
                         && (0x0c == (code_lsb & 0x0e))))
              {
                /* This insn is a rjmp or a jmp.  */
                unsigned char next_insn_msb = 0;
                unsigned char next_insn_lsb = 0;
                int insn_size;

                if (0xc0 == (code_msb & 0xf0))
                  insn_size = 2; /* rjmp insn */
                else
                  insn_size = 4; /* jmp insn */

                if (irel->r_offset + insn_size + 1 < sec->size)
                  {
                    next_insn_msb =
                        bfd_get_8 (abfd, contents + irel->r_offset
                                         + insn_size + 1);
                    next_insn_lsb =
                        bfd_get_8 (abfd, contents + irel->r_offset
                                         + insn_size);
                  }

                if ((0x95 == next_insn_msb) && (0x08 == next_insn_lsb))
                  {
                    /* The next insn is a ret. We possibly could delete
                       this ret. First we need to check for preceeding
                       sbis/sbic/sbrs or cpse "skip" instructions.  */

                    int there_is_preceeding_non_skip_insn = 1;
                    bfd_vma address_of_ret;

                    address_of_ret = dot + insn_size;

                    if (debug_relax && (insn_size == 2))
                      printf ("found rjmp / ret sequence at address 0x%x\n",
                              (int) dot);
                    if (debug_relax && (insn_size == 4))
                      printf ("found jmp / ret sequence at address 0x%x\n",
                              (int) dot);

                    /* We have to make sure that there is a preceeding insn.  */
                    if (irel->r_offset >= 2)
                      {
                        unsigned char preceeding_msb;
                        unsigned char preceeding_lsb;
                        preceeding_msb =
                            bfd_get_8 (abfd, contents + irel->r_offset - 1);
                        preceeding_lsb =
                            bfd_get_8 (abfd, contents + irel->r_offset - 2);

                        /* sbic.  */
                        if (0x99 == preceeding_msb)
                          there_is_preceeding_non_skip_insn = 0;

                        /* sbis.  */
                        if (0x9b == preceeding_msb)
                          there_is_preceeding_non_skip_insn = 0;

                        /* sbrc */
                        if ((0xfc == (preceeding_msb & 0xfe)
                            && (0x00 == (preceeding_lsb & 0x08))))
                          there_is_preceeding_non_skip_insn = 0;

                        /* sbrs */
                        if ((0xfe == (preceeding_msb & 0xfe)
                            && (0x00 == (preceeding_lsb & 0x08))))
                          there_is_preceeding_non_skip_insn = 0;

                        /* cpse */
                        if (0x10 == (preceeding_msb & 0xfc))
                          there_is_preceeding_non_skip_insn = 0;

                        if (there_is_preceeding_non_skip_insn == 0)
                          if (debug_relax)
                            printf ("preceeding skip insn prevents deletion of"
                                    " ret insn at addr 0x%x in section %s\n",
                                    (int) dot + 2, sec->name);
                      }
                    else
                      {
                        /* There is no previous instruction.  */
                        there_is_preceeding_non_skip_insn = 0;
                      }

                    if (there_is_preceeding_non_skip_insn)
                      {
                        /* We now only have to make sure that there is no
                           local label defined at the address of the ret
                           instruction and that there is no local relocation
                           in this section pointing to the ret.  */

                        int deleting_ret_is_safe = 1;
                        unsigned int section_offset_of_ret_insn =
                                          irel->r_offset + insn_size;
                        Elf_Internal_Sym *isym, *isymend;
                        unsigned int sec_shndx;

                        sec_shndx =
                       _bfd_elf_section_from_bfd_section (abfd, sec);

                        /* Check for local symbols.  */
                        isym = (Elf_Internal_Sym *) symtab_hdr->contents;
                        isymend = isym + symtab_hdr->sh_info;
                        for (; isym < isymend; isym++)
                         {
                           if (isym->st_value == section_offset_of_ret_insn
                               && isym->st_shndx == sec_shndx)
                             {
                               deleting_ret_is_safe = 0;
                               if (debug_relax)
                                 printf ("local label prevents deletion of ret "
                                         "insn at address 0x%x\n",
                                         (int) dot + insn_size);
                             }
                         }

                         /* Now check for global symbols.  */
                         {
                           int symcount;
                           struct elf_link_hash_entry **sym_hashes;
                           struct elf_link_hash_entry **end_hashes;

                           symcount = (symtab_hdr->sh_size
                                       / sizeof (Elf32_External_Sym)
                                       - symtab_hdr->sh_info);
                           sym_hashes = elf_sym_hashes (abfd);
                           end_hashes = sym_hashes + symcount;
                           for (; sym_hashes < end_hashes; sym_hashes++)
                            {
                              struct elf_link_hash_entry *sym_hash =
                                                                 *sym_hashes;
                              if ((sym_hash->root.type == bfd_link_hash_defined
                                  || sym_hash->root.type ==
                               bfd_link_hash_defweak)
                                  && sym_hash->root.u.def.section == sec
                                  && sym_hash->root.u.def.value == section_offset_of_ret_insn)
                                {
                                  deleting_ret_is_safe = 0;
                                  if (debug_relax)
                                    printf ("global label prevents deletion of "
                                            "ret insn at address 0x%x\n",
                                            (int) dot + insn_size);
                                }
                            }
                         }
                         /* Now we check for relocations pointing to ret.  */
                         {
                           Elf_Internal_Rela *irel;
                           Elf_Internal_Rela *relend;
                           Elf_Internal_Shdr *symtab_hdr;

                           symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
                           relend = elf_section_data (sec)->relocs
                                    + sec->reloc_count;

                           for (irel = elf_section_data (sec)->relocs;
                                irel < relend; irel++)
                             {
                               bfd_vma reloc_target = 0;
                               bfd_vma symval;
                               Elf_Internal_Sym *isymbuf = NULL;

                               /* Read this BFD's local symbols if we haven't
                                  done so already.  */
                               if (isymbuf == NULL && symtab_hdr->sh_info != 0)
                                 {
                                   isymbuf = (Elf_Internal_Sym *)
                                             symtab_hdr->contents;
                                   if (isymbuf == NULL)
                                     isymbuf = bfd_elf_get_elf_syms
                                   (abfd,
                                   symtab_hdr,
                                   symtab_hdr->sh_info, 0,
                                   NULL, NULL, NULL);
                                   if (isymbuf == NULL)
                                     break;
                                  }

                               /* Get the value of the symbol referred to
                                  by the reloc.  */
                               if (ELF32_R_SYM (irel->r_info)
                                   < symtab_hdr->sh_info)
                                 {
                                   /* A local symbol.  */
                                   Elf_Internal_Sym *isym;
                                   asection *sym_sec;

                                   isym = isymbuf
                                          + ELF32_R_SYM (irel->r_info);
                                   sym_sec = bfd_section_from_elf_index
                                 (abfd, isym->st_shndx);
                                   symval = isym->st_value;

                                   /* If the reloc is absolute, it will not
                                      have a symbol or section associated
                                      with it.  */

                                   if (sym_sec)
                                     {
                                       symval +=
                                           sym_sec->output_section->vma
                                           + sym_sec->output_offset;
                                       reloc_target = symval + irel->r_addend;
                                     }
                                   else
                                     {
                                       reloc_target = symval + irel->r_addend;
                                       /* Reference symbol is absolute.  */
                                     }
                                 }
                            /* else ... reference symbol is extern.  */

                               if (address_of_ret == reloc_target)
                                 {
                                   deleting_ret_is_safe = 0;
                                   if (debug_relax)
                                     printf ("ret from "
                                             "rjmp/jmp ret sequence at address"
                                             " 0x%x could not be deleted. ret"
                                             " is target of a relocation.\n",
                                             (int) address_of_ret);
                                 }
                             }
                         }

                         if (deleting_ret_is_safe)
                           {
                             if (debug_relax)
                               printf ("unreachable ret instruction "
                                       "at address 0x%x deleted.\n",
                                       (int) dot + insn_size);

                             /* Delete two bytes of data.  */
                             if (!elf32_avr_relax_delete_bytes (abfd, sec,
                                        irel->r_offset + insn_size, 2))
                               goto error_return;

                             /* That will change things, so, we should relax
                                again. Note that this is not required, and it
                                may be slow.  */
                             *again = TRUE;
                             break;
                           }
                      }

                  }
              }
            break;
          }
        }
    }

  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    {
      if (! link_info->keep_memory)
        free (contents);
      else
        {
          /* Cache the section contents for elf_link_input_bfd.  */
          elf_section_data (sec)->this_hdr.contents = contents;
        }
    }

  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return TRUE;

 error_return:
  if (isymbuf != NULL
      && symtab_hdr->contents != (unsigned char *) isymbuf)
    free (isymbuf);
  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    free (contents);
  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return FALSE;
}

Here is the call graph for this function:

static bfd_boolean elf32_avr_relocate_section ( bfd *output_bfd  ATTRIBUTE_UNUSED,
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 
) [static]

Definition at line 1157 of file elf32-avr.c.

{
  Elf_Internal_Shdr *           symtab_hdr;
  struct elf_link_hash_entry ** sym_hashes;
  Elf_Internal_Rela *           rel;
  Elf_Internal_Rela *           relend;
  struct elf32_avr_link_hash_table * htab = avr_link_hash_table (info);

  symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  relend     = relocs + input_section->reloc_count;

  for (rel = relocs; rel < relend; rel ++)
    {
      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;
      const char *                 name;
      int                          r_type;

      r_type = ELF32_R_TYPE (rel->r_info);
      r_symndx = ELF32_R_SYM (rel->r_info);
      howto  = elf_avr_howto_table + ELF32_R_TYPE (rel->r_info);
      h      = NULL;
      sym    = NULL;
      sec    = NULL;

      if (r_symndx < symtab_hdr->sh_info)
       {
         sym = local_syms + r_symndx;
         sec = local_sections [r_symndx];
         relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);

         name = bfd_elf_string_from_elf_section
           (input_bfd, symtab_hdr->sh_link, sym->st_name);
         name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name;
       }
      else
       {
         bfd_boolean unresolved_reloc, warned;

         RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
                               r_symndx, symtab_hdr, sym_hashes,
                               h, sec, relocation,
                               unresolved_reloc, warned);

         name = h->root.root.string;
       }

      if (sec != NULL && elf_discarded_section (sec))
       {
         /* For relocs against symbols from removed linkonce sections,
            or sections discarded by a linker script, we just want the
            section contents zeroed.  Avoid any special processing.  */
         _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
         rel->r_info = 0;
         rel->r_addend = 0;
         continue;
       }

      if (info->relocatable)
       continue;

      r = avr_final_link_relocate (howto, input_bfd, input_section,
                               contents, rel, relocation, htab);

      if (r != bfd_reloc_ok)
       {
         const char * msg = (const char *) NULL;

         switch (r)
           {
           case bfd_reloc_overflow:
             r = info->callbacks->reloc_overflow
              (info, (h ? &h->root : NULL),
               name, howto->name, (bfd_vma) 0,
               input_bfd, input_section, rel->r_offset);
             break;

           case bfd_reloc_undefined:
             r = info->callbacks->undefined_symbol
              (info, name, input_bfd, input_section, rel->r_offset, TRUE);
             break;

           case bfd_reloc_outofrange:
             msg = _("internal error: out of range error");
             break;

           case bfd_reloc_notsupported:
             msg = _("internal error: unsupported relocation error");
             break;

           case bfd_reloc_dangerous:
             msg = _("internal error: dangerous relocation");
             break;

           default:
             msg = _("internal error: unknown error");
             break;
           }

         if (msg)
           r = info->callbacks->warning
             (info, msg, name, input_bfd, input_section, rel->r_offset);

         if (! r)
           return FALSE;
       }
    }

  return TRUE;
}

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void elf32_avr_setup_params ( struct bfd_link_info info,
bfd avr_stub_bfd,
asection avr_stub_section,
bfd_boolean  no_stubs,
bfd_boolean  deb_stubs,
bfd_boolean  deb_relax,
bfd_vma  pc_wrap_around,
bfd_boolean  call_ret_replacement 
)

Definition at line 2492 of file elf32-avr.c.

{
  struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);

  if (htab == NULL)
    return;
  htab->stub_sec = avr_stub_section;
  htab->stub_bfd = avr_stub_bfd;
  htab->no_stubs = no_stubs;

  debug_relax = deb_relax;
  debug_stubs = deb_stubs;
  avr_pc_wrap_around = pc_wrap_around;
  avr_replace_call_ret_sequences = call_ret_replacement;
}
int elf32_avr_setup_section_lists ( bfd output_bfd,
struct bfd_link_info info 
)

Definition at line 2523 of file elf32-avr.c.

{
  bfd *input_bfd;
  unsigned int bfd_count;
  int top_id, top_index;
  asection *section;
  asection **input_list, **list;
  bfd_size_type amt;
  struct elf32_avr_link_hash_table *htab = avr_link_hash_table(info);

  if (htab == NULL || htab->no_stubs)
    return 0;

  /* Count the number of input BFDs and find the top input section id.  */
  for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0;
       input_bfd != NULL;
       input_bfd = input_bfd->link_next)
    {
      bfd_count += 1;
      for (section = input_bfd->sections;
           section != NULL;
           section = section->next)
       if (top_id < section->id)
         top_id = section->id;
    }

  htab->bfd_count = bfd_count;

  /* We can't use output_bfd->section_count here to find the top output
     section index as some sections may have been removed, and
     strip_excluded_output_sections doesn't renumber the indices.  */
  for (section = output_bfd->sections, top_index = 0;
       section != NULL;
       section = section->next)
    if (top_index < section->index)
      top_index = section->index;

  htab->top_index = top_index;
  amt = sizeof (asection *) * (top_index + 1);
  input_list = bfd_malloc (amt);
  htab->input_list = input_list;
  if (input_list == NULL)
    return -1;

  /* For sections we aren't interested in, mark their entries with a
     value we can check later.  */
  list = input_list + top_index;
  do
    *list = bfd_abs_section_ptr;
  while (list-- != input_list);

  for (section = output_bfd->sections;
       section != NULL;
       section = section->next)
    if ((section->flags & SEC_CODE) != 0)
      input_list[section->index] = NULL;

  return 1;
}

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bfd_boolean elf32_avr_size_stubs ( bfd output_bfd,
struct bfd_link_info info,
bfd_boolean  is_prealloc_run 
)

Definition at line 2644 of file elf32-avr.c.

{
  struct elf32_avr_link_hash_table *htab;
  int stub_changed = 0;

  htab = avr_link_hash_table (info);
  if (htab == NULL)
    return FALSE;

  /* At this point we initialize htab->vector_base
     To the start of the text output section.  */
  htab->vector_base = htab->stub_sec->output_section->vma;

  if (get_local_syms (info->input_bfds, info))
    {
      if (htab->all_local_syms)
       goto error_ret_free_local;
      return FALSE;
    }

  if (ADD_DUMMY_STUBS_FOR_DEBUGGING)
    {
      struct elf32_avr_stub_hash_entry *test;

      test = avr_add_stub ("Hugo",htab);
      test->target_value = 0x123456;
      test->stub_offset = 13;

      test = avr_add_stub ("Hugo2",htab);
      test->target_value = 0x84210;
      test->stub_offset = 14;
    }

  while (1)
    {
      bfd *input_bfd;
      unsigned int bfd_indx;

      /* We will have to re-generate the stub hash table each time anything
         in memory has changed.  */

      bfd_hash_traverse (&htab->bstab, avr_mark_stub_not_to_be_necessary, htab);
      for (input_bfd = info->input_bfds, bfd_indx = 0;
           input_bfd != NULL;
           input_bfd = input_bfd->link_next, bfd_indx++)
        {
          Elf_Internal_Shdr *symtab_hdr;
          asection *section;
          Elf_Internal_Sym *local_syms;

          /* We'll need the symbol table in a second.  */
          symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
          if (symtab_hdr->sh_info == 0)
            continue;

          local_syms = htab->all_local_syms[bfd_indx];

          /* Walk over each section attached to the input bfd.  */
          for (section = input_bfd->sections;
               section != NULL;
               section = section->next)
            {
              Elf_Internal_Rela *internal_relocs, *irelaend, *irela;

              /* If there aren't any relocs, then there's nothing more
                 to do.  */
              if ((section->flags & SEC_RELOC) == 0
                  || section->reloc_count == 0)
                continue;

              /* If this section is a link-once section that will be
                 discarded, then don't create any stubs.  */
              if (section->output_section == NULL
                  || section->output_section->owner != output_bfd)
                continue;

              /* Get the relocs.  */
              internal_relocs
                = _bfd_elf_link_read_relocs (input_bfd, section, NULL, NULL,
                                             info->keep_memory);
              if (internal_relocs == NULL)
                goto error_ret_free_local;

              /* Now examine each relocation.  */
              irela = internal_relocs;
              irelaend = irela + section->reloc_count;
              for (; irela < irelaend; irela++)
                {
                  unsigned int r_type, r_indx;
                  struct elf32_avr_stub_hash_entry *hsh;
                  asection *sym_sec;
                  bfd_vma sym_value;
                  bfd_vma destination;
                  struct elf_link_hash_entry *hh;
                  char *stub_name;

                  r_type = ELF32_R_TYPE (irela->r_info);
                  r_indx = ELF32_R_SYM (irela->r_info);

                  /* Only look for 16 bit GS relocs. No other reloc will need a
                     stub.  */
                  if (!((r_type == R_AVR_16_PM)
                        || (r_type == R_AVR_LO8_LDI_GS)
                        || (r_type == R_AVR_HI8_LDI_GS)))
                    continue;

                  /* Now determine the call target, its name, value,
                     section.  */
                  sym_sec = NULL;
                  sym_value = 0;
                  destination = 0;
                  hh = NULL;
                  if (r_indx < symtab_hdr->sh_info)
                    {
                      /* It's a local symbol.  */
                      Elf_Internal_Sym *sym;
                      Elf_Internal_Shdr *hdr;

                      sym = local_syms + r_indx;
                      hdr = elf_elfsections (input_bfd)[sym->st_shndx];
                      sym_sec = hdr->bfd_section;
                      if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
                        sym_value = sym->st_value;
                      destination = (sym_value + irela->r_addend
                                     + sym_sec->output_offset
                                     + sym_sec->output_section->vma);
                    }
                  else
                    {
                      /* It's an external symbol.  */
                      int e_indx;

                      e_indx = r_indx - symtab_hdr->sh_info;
                      hh = elf_sym_hashes (input_bfd)[e_indx];

                      while (hh->root.type == bfd_link_hash_indirect
                             || hh->root.type == bfd_link_hash_warning)
                        hh = (struct elf_link_hash_entry *)
                              (hh->root.u.i.link);

                      if (hh->root.type == bfd_link_hash_defined
                          || hh->root.type == bfd_link_hash_defweak)
                        {
                          sym_sec = hh->root.u.def.section;
                          sym_value = hh->root.u.def.value;
                          if (sym_sec->output_section != NULL)
                          destination = (sym_value + irela->r_addend
                                         + sym_sec->output_offset
                                         + sym_sec->output_section->vma);
                        }
                      else if (hh->root.type == bfd_link_hash_undefweak)
                        {
                          if (! info->shared)
                            continue;
                        }
                      else if (hh->root.type == bfd_link_hash_undefined)
                        {
                          if (! (info->unresolved_syms_in_objects == RM_IGNORE
                                 && (ELF_ST_VISIBILITY (hh->other)
                                     == STV_DEFAULT)))
                             continue;
                        }
                      else
                        {
                          bfd_set_error (bfd_error_bad_value);

                          error_ret_free_internal:
                          if (elf_section_data (section)->relocs == NULL)
                            free (internal_relocs);
                          goto error_ret_free_local;
                        }
                    }

                  if (! avr_stub_is_required_for_16_bit_reloc
                    (destination - htab->vector_base))
                    {
                      if (!is_prealloc_run)
                     /* We are having a reloc that does't need a stub.  */
                     continue;

                    /* We don't right now know if a stub will be needed.
                      Let's rather be on the safe side.  */
                    }

                  /* Get the name of this stub.  */
                  stub_name = avr_stub_name (sym_sec, sym_value, irela);

                  if (!stub_name)
                    goto error_ret_free_internal;


                  hsh = avr_stub_hash_lookup (&htab->bstab,
                                              stub_name,
                                              FALSE, FALSE);
                  if (hsh != NULL)
                    {
                      /* The proper stub has already been created.  Mark it
                         to be used and write the possibly changed destination
                         value.  */
                      hsh->is_actually_needed = TRUE;
                      hsh->target_value = destination;
                      free (stub_name);
                      continue;
                    }

                  hsh = avr_add_stub (stub_name, htab);
                  if (hsh == NULL)
                    {
                      free (stub_name);
                      goto error_ret_free_internal;
                    }

                  hsh->is_actually_needed = TRUE;
                  hsh->target_value = destination;

                  if (debug_stubs)
                    printf ("Adding stub with destination 0x%x to the"
                            " hash table.\n", (unsigned int) destination);
                  if (debug_stubs)
                    printf ("(Pre-Alloc run: %i)\n", is_prealloc_run);

                  stub_changed = TRUE;
                }

              /* We're done with the internal relocs, free them.  */
              if (elf_section_data (section)->relocs == NULL)
                free (internal_relocs);
            }
        }

      /* Re-Calculate the number of needed stubs.  */
      htab->stub_sec->size = 0;
      bfd_hash_traverse (&htab->bstab, avr_size_one_stub, htab);

      if (!stub_changed)
        break;

      stub_changed = FALSE;
    }

  free (htab->all_local_syms);
  return TRUE;

 error_ret_free_local:
  free (htab->all_local_syms);
  return FALSE;
}

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static int get_local_syms ( bfd input_bfd,
struct bfd_link_info info 
) [static]

Definition at line 2590 of file elf32-avr.c.

{
  unsigned int bfd_indx;
  Elf_Internal_Sym *local_syms, **all_local_syms;
  struct elf32_avr_link_hash_table *htab = avr_link_hash_table (info);

  if (htab == NULL)
    return -1;

  /* We want to read in symbol extension records only once.  To do this
     we need to read in the local symbols in parallel and save them for
     later use; so hold pointers to the local symbols in an array.  */
  bfd_size_type amt = sizeof (Elf_Internal_Sym *) * htab->bfd_count;
  all_local_syms = bfd_zmalloc (amt);
  htab->all_local_syms = all_local_syms;
  if (all_local_syms == NULL)
    return -1;

  /* Walk over all the input BFDs, swapping in local symbols.
     If we are creating a shared library, create hash entries for the
     export stubs.  */
  for (bfd_indx = 0;
       input_bfd != NULL;
       input_bfd = input_bfd->link_next, bfd_indx++)
    {
      Elf_Internal_Shdr *symtab_hdr;

      /* We'll need the symbol table in a second.  */
      symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
      if (symtab_hdr->sh_info == 0)
       continue;

      /* We need an array of the local symbols attached to the input bfd.  */
      local_syms = (Elf_Internal_Sym *) symtab_hdr->contents;
      if (local_syms == NULL)
       {
         local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
                                        symtab_hdr->sh_info, 0,
                                        NULL, NULL, NULL);
         /* Cache them for elf_link_input_bfd.  */
         symtab_hdr->contents = (unsigned char *) local_syms;
       }
      if (local_syms == NULL)
       return -1;

      all_local_syms[bfd_indx] = local_syms;
    }

  return 0;
}

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static struct bfd_hash_entry* stub_hash_newfunc ( struct bfd_hash_entry entry,
struct bfd_hash_table table,
const char *  string 
) [static, read]

Definition at line 563 of file elf32-avr.c.

{
  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (entry == NULL)
    {
      entry = bfd_hash_allocate (table,
                                 sizeof (struct elf32_avr_stub_hash_entry));
      if (entry == NULL)
        return entry;
    }

  /* Call the allocation method of the superclass.  */
  entry = bfd_hash_newfunc (entry, table, string);
  if (entry != NULL)
    {
      struct elf32_avr_stub_hash_entry *hsh;

      /* Initialize the local fields.  */
      hsh = avr_stub_hash_entry (entry);
      hsh->stub_offset = 0;
      hsh->target_value = 0;
    }

  return entry;
}

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Variable Documentation

bfd_vma avr_pc_wrap_around = 0x10000000 [static]

Definition at line 553 of file elf32-avr.c.

struct avr_reloc_map[] [static]
Initial value:
{
  { BFD_RELOC_NONE,                 R_AVR_NONE },
  { BFD_RELOC_32,                   R_AVR_32 },
  { BFD_RELOC_AVR_7_PCREL,          R_AVR_7_PCREL },
  { BFD_RELOC_AVR_13_PCREL,         R_AVR_13_PCREL },
  { BFD_RELOC_16,                   R_AVR_16 },
  { BFD_RELOC_AVR_16_PM,            R_AVR_16_PM },
  { BFD_RELOC_AVR_LO8_LDI,          R_AVR_LO8_LDI},
  { BFD_RELOC_AVR_HI8_LDI,          R_AVR_HI8_LDI },
  { BFD_RELOC_AVR_HH8_LDI,          R_AVR_HH8_LDI },
  { BFD_RELOC_AVR_MS8_LDI,          R_AVR_MS8_LDI },
  { BFD_RELOC_AVR_LO8_LDI_NEG,      R_AVR_LO8_LDI_NEG },
  { BFD_RELOC_AVR_HI8_LDI_NEG,      R_AVR_HI8_LDI_NEG },
  { BFD_RELOC_AVR_HH8_LDI_NEG,      R_AVR_HH8_LDI_NEG },
  { BFD_RELOC_AVR_MS8_LDI_NEG,      R_AVR_MS8_LDI_NEG },
  { BFD_RELOC_AVR_LO8_LDI_PM,       R_AVR_LO8_LDI_PM },
  { BFD_RELOC_AVR_LO8_LDI_GS,       R_AVR_LO8_LDI_GS },
  { BFD_RELOC_AVR_HI8_LDI_PM,       R_AVR_HI8_LDI_PM },
  { BFD_RELOC_AVR_HI8_LDI_GS,       R_AVR_HI8_LDI_GS },
  { BFD_RELOC_AVR_HH8_LDI_PM,       R_AVR_HH8_LDI_PM },
  { BFD_RELOC_AVR_LO8_LDI_PM_NEG,   R_AVR_LO8_LDI_PM_NEG },
  { BFD_RELOC_AVR_HI8_LDI_PM_NEG,   R_AVR_HI8_LDI_PM_NEG },
  { BFD_RELOC_AVR_HH8_LDI_PM_NEG,   R_AVR_HH8_LDI_PM_NEG },
  { BFD_RELOC_AVR_CALL,             R_AVR_CALL },
  { BFD_RELOC_AVR_LDI,              R_AVR_LDI  },
  { BFD_RELOC_AVR_6,                R_AVR_6    },
  { BFD_RELOC_AVR_6_ADIW,           R_AVR_6_ADIW }
}

Definition at line 515 of file elf32-avr.c.

Definition at line 558 of file elf32-avr.c.

Definition at line 31 of file elf32-avr.c.

Definition at line 34 of file elf32-avr.c.

reloc_howto_type elf_avr_howto_table[] [static]

Definition at line 117 of file elf32-avr.c.