1629 lines
48 KiB
C
1629 lines
48 KiB
C
/* Motorola 68HC11-specific support for 32-bit ELF
|
||
Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
|
||
Contributed by Stephane Carrez (stcarrez@nerim.fr)
|
||
(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
|
||
|
||
This file is part of BFD, the Binary File Descriptor library.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
#include "bfd.h"
|
||
#include "sysdep.h"
|
||
#include "bfdlink.h"
|
||
#include "libbfd.h"
|
||
#include "elf-bfd.h"
|
||
#include "elf/m68hc11.h"
|
||
|
||
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
|
||
PARAMS ((bfd *, bfd_reloc_code_real_type));
|
||
static void m68hc11_info_to_howto_rel
|
||
PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
|
||
|
||
static bfd_reloc_status_type m68hc11_elf_ignore_reloc
|
||
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
|
||
|
||
/* GC mark and sweep. */
|
||
static asection *elf32_m68hc11_gc_mark_hook
|
||
PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
|
||
struct elf_link_hash_entry *, Elf_Internal_Sym *));
|
||
static boolean elf32_m68hc11_gc_sweep_hook
|
||
PARAMS ((bfd *, struct bfd_link_info *, asection *,
|
||
const Elf_Internal_Rela *));
|
||
static boolean elf32_m68hc11_check_relocs
|
||
PARAMS ((bfd *, struct bfd_link_info *, asection *,
|
||
const Elf_Internal_Rela *));
|
||
static boolean elf32_m68hc11_relocate_section
|
||
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
|
||
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
|
||
static boolean m68hc11_elf_relax_section
|
||
PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
|
||
static void m68hc11_elf_relax_delete_bytes
|
||
PARAMS ((bfd *, asection *, bfd_vma, int));
|
||
static void m68hc11_relax_group
|
||
PARAMS ((bfd *, asection *, bfd_byte *, unsigned,
|
||
unsigned long, unsigned long));
|
||
static int compare_reloc PARAMS ((const void *, const void *));
|
||
|
||
|
||
boolean _bfd_m68hc11_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
|
||
boolean _bfd_m68hc11_elf_set_private_flags PARAMS ((bfd *, flagword));
|
||
boolean _bfd_m68hc11_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
|
||
|
||
/* Use REL instead of RELA to save space */
|
||
#define USE_REL
|
||
|
||
/* The Motorola 68HC11 microcontroler only addresses 64Kb.
|
||
We must handle 8 and 16-bit relocations. The 32-bit relocation
|
||
is defined but not used except by gas when -gstabs is used (which
|
||
is wrong).
|
||
The 3-bit and 16-bit PC rel relocation is only used by 68HC12. */
|
||
static reloc_howto_type elf_m68hc11_howto_table[] = {
|
||
/* This reloc does nothing. */
|
||
HOWTO (R_M68HC11_NONE, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont,/* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_NONE", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 8 bit absolute relocation */
|
||
HOWTO (R_M68HC11_8, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
8, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_8", /* name */
|
||
false, /* partial_inplace */
|
||
0x00ff, /* src_mask */
|
||
0x00ff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 8 bit absolute relocation (upper address) */
|
||
HOWTO (R_M68HC11_HI8, /* type */
|
||
8, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
8, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_HI8", /* name */
|
||
false, /* partial_inplace */
|
||
0x00ff, /* src_mask */
|
||
0x00ff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 8 bit absolute relocation (upper address) */
|
||
HOWTO (R_M68HC11_LO8, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
8, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_LO8", /* name */
|
||
false, /* partial_inplace */
|
||
0x00ff, /* src_mask */
|
||
0x00ff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 8 bit PC-rel relocation */
|
||
HOWTO (R_M68HC11_PCREL_8, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
8, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_PCREL_8", /* name */
|
||
false, /* partial_inplace */
|
||
0x00ff, /* src_mask */
|
||
0x00ff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 16 bit absolute relocation */
|
||
HOWTO (R_M68HC11_16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_16", /* name */
|
||
false, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 32 bit absolute relocation. This one is never used for the
|
||
code relocation. It's used by gas for -gstabs generation. */
|
||
HOWTO (R_M68HC11_32, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_32", /* name */
|
||
false, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 3 bit absolute relocation */
|
||
HOWTO (R_M68HC11_3B, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
3, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_4B", /* name */
|
||
false, /* partial_inplace */
|
||
0x003, /* src_mask */
|
||
0x003, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 16 bit PC-rel relocation */
|
||
HOWTO (R_M68HC11_PCREL_16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_PCREL_16", /* name */
|
||
false, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* GNU extension to record C++ vtable hierarchy */
|
||
HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
NULL, /* special_function */
|
||
"R_M68HC11_GNU_VTINHERIT", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* GNU extension to record C++ vtable member usage */
|
||
HOWTO (R_M68HC11_GNU_VTENTRY, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
_bfd_elf_rel_vtable_reloc_fn, /* special_function */
|
||
"R_M68HC11_GNU_VTENTRY", /* name */
|
||
false, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 24 bit relocation */
|
||
HOWTO (R_M68HC11_24, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
24, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_24", /* name */
|
||
false, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A 16-bit low relocation */
|
||
HOWTO (R_M68HC11_LO16, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_LO16", /* name */
|
||
false, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
/* A page relocation */
|
||
HOWTO (R_M68HC11_PAGE, /* type */
|
||
0, /* rightshift */
|
||
0, /* size (0 = byte, 1 = short, 2 = long) */
|
||
8, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_bitfield, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_M68HC11_PAGE", /* name */
|
||
false, /* partial_inplace */
|
||
0x00ff, /* src_mask */
|
||
0x00ff, /* dst_mask */
|
||
false), /* pcrel_offset */
|
||
|
||
EMPTY_HOWTO (14),
|
||
EMPTY_HOWTO (15),
|
||
EMPTY_HOWTO (16),
|
||
EMPTY_HOWTO (17),
|
||
EMPTY_HOWTO (18),
|
||
EMPTY_HOWTO (19),
|
||
|
||
/* Mark beginning of a jump instruction (any form). */
|
||
HOWTO (R_M68HC11_RL_JUMP, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
m68hc11_elf_ignore_reloc, /* special_function */
|
||
"R_M68HC11_RL_JUMP", /* name */
|
||
true, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* Mark beginning of Gcc relaxation group instruction. */
|
||
HOWTO (R_M68HC11_RL_GROUP, /* type */
|
||
0, /* rightshift */
|
||
1, /* size (0 = byte, 1 = short, 2 = long) */
|
||
0, /* bitsize */
|
||
false, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
m68hc11_elf_ignore_reloc, /* special_function */
|
||
"R_M68HC11_RL_GROUP", /* name */
|
||
true, /* partial_inplace */
|
||
0, /* src_mask */
|
||
0, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
};
|
||
|
||
/* Map BFD reloc types to M68HC11 ELF reloc types. */
|
||
|
||
struct m68hc11_reloc_map
|
||
{
|
||
bfd_reloc_code_real_type bfd_reloc_val;
|
||
unsigned char elf_reloc_val;
|
||
};
|
||
|
||
static const struct m68hc11_reloc_map m68hc11_reloc_map[] = {
|
||
{BFD_RELOC_NONE, R_M68HC11_NONE,},
|
||
{BFD_RELOC_8, R_M68HC11_8},
|
||
{BFD_RELOC_M68HC11_HI8, R_M68HC11_HI8},
|
||
{BFD_RELOC_M68HC11_LO8, R_M68HC11_LO8},
|
||
{BFD_RELOC_8_PCREL, R_M68HC11_PCREL_8},
|
||
{BFD_RELOC_16_PCREL, R_M68HC11_PCREL_16},
|
||
{BFD_RELOC_16, R_M68HC11_16},
|
||
{BFD_RELOC_32, R_M68HC11_32},
|
||
{BFD_RELOC_M68HC11_3B, R_M68HC11_3B},
|
||
|
||
{BFD_RELOC_VTABLE_INHERIT, R_M68HC11_GNU_VTINHERIT},
|
||
{BFD_RELOC_VTABLE_ENTRY, R_M68HC11_GNU_VTENTRY},
|
||
|
||
{BFD_RELOC_M68HC11_LO16, R_M68HC11_LO16},
|
||
{BFD_RELOC_M68HC11_PAGE, R_M68HC11_PAGE},
|
||
{BFD_RELOC_M68HC11_24, R_M68HC11_24},
|
||
|
||
{BFD_RELOC_M68HC11_RL_JUMP, R_M68HC11_RL_JUMP},
|
||
{BFD_RELOC_M68HC11_RL_GROUP, R_M68HC11_RL_GROUP},
|
||
};
|
||
|
||
static reloc_howto_type *
|
||
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0;
|
||
i < sizeof (m68hc11_reloc_map) / sizeof (struct m68hc11_reloc_map);
|
||
i++)
|
||
{
|
||
if (m68hc11_reloc_map[i].bfd_reloc_val == code)
|
||
return &elf_m68hc11_howto_table[m68hc11_reloc_map[i].elf_reloc_val];
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* This function is used for relocs which are only used for relaxing,
|
||
which the linker should otherwise ignore. */
|
||
|
||
static bfd_reloc_status_type
|
||
m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
|
||
output_bfd, error_message)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol ATTRIBUTE_UNUSED;
|
||
PTR data ATTRIBUTE_UNUSED;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message ATTRIBUTE_UNUSED;
|
||
{
|
||
if (output_bfd != NULL)
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* Set the howto pointer for an M68HC11 ELF reloc. */
|
||
|
||
static void
|
||
m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *cache_ptr;
|
||
Elf32_Internal_Rel *dst;
|
||
{
|
||
unsigned int r_type;
|
||
|
||
r_type = ELF32_R_TYPE (dst->r_info);
|
||
BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
|
||
cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
|
||
}
|
||
|
||
static asection *
|
||
elf32_m68hc11_gc_mark_hook (sec, info, rel, h, sym)
|
||
asection *sec;
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
||
Elf_Internal_Rela *rel;
|
||
struct elf_link_hash_entry *h;
|
||
Elf_Internal_Sym *sym;
|
||
{
|
||
if (h != NULL)
|
||
{
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
default:
|
||
switch (h->root.type)
|
||
{
|
||
case bfd_link_hash_defined:
|
||
case bfd_link_hash_defweak:
|
||
return h->root.u.def.section;
|
||
|
||
case bfd_link_hash_common:
|
||
return h->root.u.c.p->section;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
|
||
|
||
return NULL;
|
||
}
|
||
|
||
static boolean
|
||
elf32_m68hc11_gc_sweep_hook (abfd, info, sec, relocs)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
struct bfd_link_info *info ATTRIBUTE_UNUSED;
|
||
asection *sec ATTRIBUTE_UNUSED;
|
||
const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED;
|
||
{
|
||
/* We don't use got and plt entries for 68hc11/68hc12. */
|
||
return true;
|
||
}
|
||
|
||
struct m68hc11_direct_relax
|
||
{
|
||
const char *name;
|
||
unsigned char code;
|
||
unsigned char direct_code;
|
||
} m68hc11_direct_relax_table[] = {
|
||
{ "adca", 0xB9, 0x99 },
|
||
{ "adcb", 0xF9, 0xD9 },
|
||
{ "adda", 0xBB, 0x9B },
|
||
{ "addb", 0xFB, 0xDB },
|
||
{ "addd", 0xF3, 0xD3 },
|
||
{ "anda", 0xB4, 0x94 },
|
||
{ "andb", 0xF4, 0xD4 },
|
||
{ "cmpa", 0xB1, 0x91 },
|
||
{ "cmpb", 0xF1, 0xD1 },
|
||
{ "cpd", 0xB3, 0x93 },
|
||
{ "cpxy", 0xBC, 0x9C },
|
||
/* { "cpy", 0xBC, 0x9C }, */
|
||
{ "eora", 0xB8, 0x98 },
|
||
{ "eorb", 0xF8, 0xD8 },
|
||
{ "jsr", 0xBD, 0x9D },
|
||
{ "ldaa", 0xB6, 0x96 },
|
||
{ "ldab", 0xF6, 0xD6 },
|
||
{ "ldd", 0xFC, 0xDC },
|
||
{ "lds", 0xBE, 0x9E },
|
||
{ "ldxy", 0xFE, 0xDE },
|
||
/* { "ldy", 0xFE, 0xDE },*/
|
||
{ "oraa", 0xBA, 0x9A },
|
||
{ "orab", 0xFA, 0xDA },
|
||
{ "sbca", 0xB2, 0x92 },
|
||
{ "sbcb", 0xF2, 0xD2 },
|
||
{ "staa", 0xB7, 0x97 },
|
||
{ "stab", 0xF7, 0xD7 },
|
||
{ "std", 0xFD, 0xDD },
|
||
{ "sts", 0xBF, 0x9F },
|
||
{ "stxy", 0xFF, 0xDF },
|
||
/* { "sty", 0xFF, 0xDF },*/
|
||
{ "suba", 0xB0, 0x90 },
|
||
{ "subb", 0xF0, 0xD0 },
|
||
{ "subd", 0xB3, 0x93 },
|
||
{ 0, 0, 0 }
|
||
};
|
||
|
||
static struct m68hc11_direct_relax *
|
||
find_relaxable_insn (unsigned char code)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; m68hc11_direct_relax_table[i].name; i++)
|
||
if (m68hc11_direct_relax_table[i].code == code)
|
||
return &m68hc11_direct_relax_table[i];
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
compare_reloc (e1, e2)
|
||
const void *e1;
|
||
const void *e2;
|
||
{
|
||
const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
|
||
const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
|
||
|
||
if (i1->r_offset == i2->r_offset)
|
||
return 0;
|
||
else
|
||
return i1->r_offset < i2->r_offset ? -1 : 1;
|
||
}
|
||
|
||
#define M6811_OP_LDX_IMMEDIATE (0xCE)
|
||
|
||
static void
|
||
m68hc11_relax_group (abfd, sec, contents, value, offset, end_group)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
bfd_byte *contents;
|
||
unsigned value;
|
||
unsigned long offset;
|
||
unsigned long end_group;
|
||
{
|
||
unsigned char code;
|
||
unsigned long start_offset;
|
||
unsigned long ldx_offset = offset;
|
||
unsigned long ldx_size;
|
||
int can_delete_ldx;
|
||
int relax_ldy = 0;
|
||
|
||
/* First instruction of the relax group must be a
|
||
LDX #value or LDY #value. If this is not the case,
|
||
ignore the relax group. */
|
||
code = bfd_get_8 (abfd, contents + offset);
|
||
if (code == 0x18)
|
||
{
|
||
relax_ldy++;
|
||
offset++;
|
||
code = bfd_get_8 (abfd, contents + offset);
|
||
}
|
||
ldx_size = offset - ldx_offset + 3;
|
||
offset += 3;
|
||
if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group)
|
||
return;
|
||
|
||
|
||
/* We can remove the LDX/LDY only when all bset/brclr instructions
|
||
of the relax group have been converted to use direct addressing
|
||
mode. */
|
||
can_delete_ldx = 1;
|
||
while (offset < end_group)
|
||
{
|
||
unsigned isize;
|
||
unsigned new_value;
|
||
int bset_use_y;
|
||
|
||
bset_use_y = 0;
|
||
start_offset = offset;
|
||
code = bfd_get_8 (abfd, contents + offset);
|
||
if (code == 0x18)
|
||
{
|
||
bset_use_y++;
|
||
offset++;
|
||
code = bfd_get_8 (abfd, contents + offset);
|
||
}
|
||
|
||
/* Check the instruction and translate to use direct addressing mode. */
|
||
switch (code)
|
||
{
|
||
/* bset */
|
||
case 0x1C:
|
||
code = 0x14;
|
||
isize = 3;
|
||
break;
|
||
|
||
/* brclr */
|
||
case 0x1F:
|
||
code = 0x13;
|
||
isize = 4;
|
||
break;
|
||
|
||
/* brset */
|
||
case 0x1E:
|
||
code = 0x12;
|
||
isize = 4;
|
||
break;
|
||
|
||
/* bclr */
|
||
case 0x1D:
|
||
code = 0x15;
|
||
isize = 3;
|
||
break;
|
||
|
||
/* This instruction is not recognized and we are not
|
||
at end of the relax group. Ignore and don't remove
|
||
the first LDX (we don't know what it is used for...). */
|
||
default:
|
||
return;
|
||
}
|
||
new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1);
|
||
new_value += value;
|
||
if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy)
|
||
{
|
||
bfd_put_8 (abfd, code, contents + offset);
|
||
bfd_put_8 (abfd, new_value, contents + offset + 1);
|
||
if (start_offset != offset)
|
||
{
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset,
|
||
offset - start_offset);
|
||
end_group--;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
can_delete_ldx = 0;
|
||
}
|
||
offset = start_offset + isize;
|
||
}
|
||
if (can_delete_ldx)
|
||
{
|
||
/* Remove the move instruction (3 or 4 bytes win). */
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size);
|
||
}
|
||
}
|
||
|
||
/* This function handles relaxing for the 68HC11.
|
||
|
||
|
||
and somewhat more difficult to support. */
|
||
|
||
static boolean
|
||
m68hc11_elf_relax_section (abfd, sec, link_info, again)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
struct bfd_link_info *link_info;
|
||
boolean *again;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *shndx_hdr;
|
||
Elf_Internal_Rela *internal_relocs;
|
||
Elf_Internal_Rela *free_relocs = NULL;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
bfd_byte *contents = NULL;
|
||
bfd_byte *free_contents = NULL;
|
||
Elf32_External_Sym *free_extsyms = NULL;
|
||
Elf_Internal_Rela *prev_insn_branch = NULL;
|
||
Elf_Internal_Rela *prev_insn_group = NULL;
|
||
unsigned insn_group_value = 0;
|
||
Elf_Internal_Sym *isymbuf = NULL;
|
||
|
||
/* Assume nothing changes. */
|
||
*again = false;
|
||
|
||
/* We don't have to do anything for a relocateable link, if
|
||
this section does not have relocs, or if this is not a
|
||
code section. */
|
||
if (link_info->relocateable
|
||
|| (sec->flags & SEC_RELOC) == 0
|
||
|| sec->reloc_count == 0
|
||
|| (sec->flags & SEC_CODE) == 0)
|
||
return true;
|
||
|
||
/* If this is the first time we have been called for this section,
|
||
initialize the cooked size. */
|
||
if (sec->_cooked_size == 0)
|
||
sec->_cooked_size = sec->_raw_size;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
|
||
|
||
/* Get a copy of the native relocations. */
|
||
internal_relocs = (_bfd_elf32_link_read_relocs
|
||
(abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
|
||
link_info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
if (! link_info->keep_memory)
|
||
free_relocs = internal_relocs;
|
||
|
||
/* Checking for branch relaxation relies on the relocations to
|
||
be sorted on 'r_offset'. This is not guaranteed so we must sort. */
|
||
qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
|
||
compare_reloc);
|
||
|
||
/* Walk through them looking for relaxing opportunities. */
|
||
irelend = internal_relocs + sec->reloc_count;
|
||
for (irel = internal_relocs; irel < irelend; irel++)
|
||
{
|
||
bfd_vma symval;
|
||
bfd_vma value;
|
||
Elf_Internal_Sym *isym;
|
||
asection *sym_sec;
|
||
|
||
/* If this isn't something that can be relaxed, then ignore
|
||
this reloc. */
|
||
if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16
|
||
&& ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP
|
||
&& ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP)
|
||
{
|
||
prev_insn_branch = 0;
|
||
prev_insn_group = 0;
|
||
continue;
|
||
}
|
||
|
||
/* Get the section contents if we haven't done so already. */
|
||
if (contents == NULL)
|
||
{
|
||
/* Get cached copy if it exists. */
|
||
if (elf_section_data (sec)->this_hdr.contents != NULL)
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
else
|
||
{
|
||
/* Go get them off disk. */
|
||
contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
|
||
if (contents == NULL)
|
||
goto error_return;
|
||
free_contents = contents;
|
||
|
||
if (! bfd_get_section_contents (abfd, sec, contents,
|
||
(file_ptr) 0, sec->_raw_size))
|
||
goto error_return;
|
||
}
|
||
}
|
||
|
||
/* Try to eliminate an unconditional 8 bit pc-relative branch
|
||
which immediately follows a conditional 8 bit pc-relative
|
||
branch around the unconditional branch.
|
||
|
||
original: new:
|
||
bCC lab1 bCC' lab2
|
||
bra lab2
|
||
lab1: lab1:
|
||
|
||
This happens when the bCC can't reach lab2 at assembly time,
|
||
but due to other relaxations it can reach at link time. */
|
||
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP)
|
||
{
|
||
Elf_Internal_Rela *nrel;
|
||
unsigned char code;
|
||
unsigned char roffset;
|
||
|
||
prev_insn_branch = 0;
|
||
prev_insn_group = 0;
|
||
|
||
/* Do nothing if this reloc is the last byte in the section. */
|
||
if (irel->r_offset == sec->_cooked_size)
|
||
continue;
|
||
|
||
/* See if the next instruction is an unconditional pc-relative
|
||
branch, more often than not this test will fail, so we
|
||
test it first to speed things up. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset + 2);
|
||
if (code != 0x7e)
|
||
continue;
|
||
|
||
/* Also make sure the next relocation applies to the next
|
||
instruction and that it's a pc-relative 8 bit branch. */
|
||
nrel = irel + 1;
|
||
if (nrel == irelend
|
||
|| irel->r_offset + 3 != nrel->r_offset
|
||
|| ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16)
|
||
continue;
|
||
|
||
/* Make sure our destination immediately follows the
|
||
unconditional branch. */
|
||
roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1);
|
||
if (roffset != 3)
|
||
continue;
|
||
|
||
prev_insn_branch = irel;
|
||
prev_insn_group = 0;
|
||
continue;
|
||
}
|
||
|
||
/* Read this BFD's 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. */
|
||
isym = isymbuf + ELF32_R_SYM (irel->r_info);
|
||
sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
|
||
symval = (isym->st_value
|
||
+ 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. */
|
||
prev_insn_branch = 0;
|
||
prev_insn_group = 0;
|
||
continue;
|
||
}
|
||
|
||
isym = 0;
|
||
sym_sec = h->root.u.def.section;
|
||
symval = (h->root.u.def.value
|
||
+ sym_sec->output_section->vma
|
||
+ sym_sec->output_offset);
|
||
}
|
||
|
||
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP)
|
||
{
|
||
prev_insn_branch = 0;
|
||
prev_insn_group = 0;
|
||
|
||
/* Do nothing if this reloc is the last byte in the section. */
|
||
if (irel->r_offset == sec->_cooked_size)
|
||
continue;
|
||
|
||
prev_insn_group = irel;
|
||
insn_group_value = isym->st_value;
|
||
continue;
|
||
}
|
||
|
||
/* When we relax some bytes, the size of our section changes.
|
||
This affects the layout of next input sections that go in our
|
||
output section. When the symbol is part of another section that
|
||
will go in the same output section as the current one, it's
|
||
final address may now be incorrect (too far). We must let the
|
||
linker re-compute all section offsets before processing this
|
||
reloc. Code example:
|
||
|
||
Initial Final
|
||
.sect .text section size = 6 section size = 4
|
||
jmp foo
|
||
jmp bar
|
||
.sect .text.foo_bar output_offset = 6 output_offset = 4
|
||
foo: rts
|
||
bar: rts
|
||
|
||
If we process the reloc now, the jmp bar is replaced by a
|
||
relative branch to the initial bar address (output_offset 6). */
|
||
if (*again && sym_sec != sec
|
||
&& sym_sec->output_section == sec->output_section)
|
||
{
|
||
prev_insn_group = 0;
|
||
prev_insn_branch = 0;
|
||
continue;
|
||
}
|
||
|
||
value = symval;
|
||
/* Try to turn a far branch to a near branch. */
|
||
if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
|
||
&& prev_insn_branch)
|
||
{
|
||
bfd_vma offset;
|
||
unsigned char code;
|
||
|
||
offset = value - (prev_insn_branch->r_offset
|
||
+ sec->output_section->vma
|
||
+ sec->output_offset + 2);
|
||
|
||
/* If the offset is still out of -128..+127 range,
|
||
leave that far branch unchanged. */
|
||
if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80)
|
||
{
|
||
prev_insn_branch = 0;
|
||
continue;
|
||
}
|
||
|
||
/* Shrink the branch. */
|
||
code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset);
|
||
if (code == 0x7e)
|
||
{
|
||
code = 0x20;
|
||
bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
|
||
bfd_put_8 (abfd, offset,
|
||
contents + prev_insn_branch->r_offset + 1);
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_NONE);
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset, 1);
|
||
}
|
||
else
|
||
{
|
||
code ^= 0x1;
|
||
bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
|
||
bfd_put_8 (abfd, offset,
|
||
contents + prev_insn_branch->r_offset + 1);
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_NONE);
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset - 1, 3);
|
||
}
|
||
prev_insn_branch = 0;
|
||
*again = true;
|
||
}
|
||
|
||
/* Try to turn a 16 bit address into a 8 bit page0 address. */
|
||
else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
|
||
&& (value & 0xff00) == 0)
|
||
{
|
||
unsigned char code;
|
||
unsigned short offset;
|
||
struct m68hc11_direct_relax *rinfo;
|
||
|
||
prev_insn_branch = 0;
|
||
offset = bfd_get_16 (abfd, contents + irel->r_offset);
|
||
offset += value;
|
||
if ((offset & 0xff00) != 0)
|
||
{
|
||
prev_insn_group = 0;
|
||
continue;
|
||
}
|
||
|
||
if (prev_insn_group)
|
||
{
|
||
unsigned long old_sec_size = sec->_cooked_size;
|
||
|
||
/* Note that we've changed the reldection contents, etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
free_relocs = NULL;
|
||
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
free_contents = NULL;
|
||
|
||
symtab_hdr->contents = (bfd_byte *) isymbuf;
|
||
free_extsyms = NULL;
|
||
|
||
m68hc11_relax_group (abfd, sec, contents, offset,
|
||
prev_insn_group->r_offset,
|
||
insn_group_value);
|
||
irel = prev_insn_group;
|
||
prev_insn_group = 0;
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_NONE);
|
||
if (sec->_cooked_size != old_sec_size)
|
||
*again = true;
|
||
continue;
|
||
}
|
||
|
||
/* Get the opcode. */
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
rinfo = find_relaxable_insn (code);
|
||
if (rinfo == 0)
|
||
{
|
||
prev_insn_group = 0;
|
||
continue;
|
||
}
|
||
|
||
/* Note that we've changed the reldection contents, etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
free_relocs = NULL;
|
||
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
free_contents = NULL;
|
||
|
||
symtab_hdr->contents = (bfd_byte *) isymbuf;
|
||
free_extsyms = NULL;
|
||
|
||
/* Fix the opcode. */
|
||
/* printf ("A relaxable case : 0x%02x (%s)\n",
|
||
code, rinfo->name); */
|
||
bfd_put_8 (abfd, rinfo->direct_code,
|
||
contents + irel->r_offset - 1);
|
||
|
||
/* Delete one byte of data (upper byte of address). */
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1);
|
||
|
||
/* Fix the relocation's type. */
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_8);
|
||
|
||
/* That will change things, so, we should relax again. */
|
||
*again = true;
|
||
}
|
||
else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16)
|
||
{
|
||
unsigned char code;
|
||
bfd_vma offset;
|
||
|
||
prev_insn_branch = 0;
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
|
||
if (code == 0x7e)
|
||
{
|
||
offset = value - (irel->r_offset
|
||
+ sec->output_section->vma
|
||
+ sec->output_offset + 1);
|
||
offset += bfd_get_16 (abfd, contents + irel->r_offset);
|
||
|
||
/* If the offset is still out of -128..+127 range,
|
||
leave that far branch unchanged. */
|
||
if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80)
|
||
{
|
||
|
||
/* Note that we've changed the reldection contents, etc. */
|
||
elf_section_data (sec)->relocs = internal_relocs;
|
||
free_relocs = NULL;
|
||
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
free_contents = NULL;
|
||
|
||
symtab_hdr->contents = (bfd_byte *) isymbuf;
|
||
free_extsyms = NULL;
|
||
|
||
/* Shrink the branch. */
|
||
code = 0x20;
|
||
bfd_put_8 (abfd, code,
|
||
contents + irel->r_offset - 1);
|
||
bfd_put_8 (abfd, offset,
|
||
contents + irel->r_offset);
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_NONE);
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec,
|
||
irel->r_offset + 1, 1);
|
||
/* That will change things, so, we should relax again. */
|
||
*again = true;
|
||
}
|
||
}
|
||
}
|
||
prev_insn_branch = 0;
|
||
}
|
||
|
||
if (free_relocs != NULL)
|
||
{
|
||
free (free_relocs);
|
||
free_relocs = NULL;
|
||
}
|
||
|
||
if (free_contents != NULL)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (free_contents);
|
||
else
|
||
{
|
||
/* Cache the section contents for elf_link_input_bfd. */
|
||
elf_section_data (sec)->this_hdr.contents = contents;
|
||
}
|
||
free_contents = NULL;
|
||
}
|
||
|
||
if (free_extsyms != NULL)
|
||
{
|
||
if (! link_info->keep_memory)
|
||
free (free_extsyms);
|
||
else
|
||
{
|
||
/* Cache the symbols for elf_link_input_bfd. */
|
||
symtab_hdr->contents = (unsigned char *) isymbuf;
|
||
}
|
||
free_extsyms = NULL;
|
||
}
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (free_relocs != NULL)
|
||
free (free_relocs);
|
||
if (free_contents != NULL)
|
||
free (free_contents);
|
||
if (free_extsyms != NULL)
|
||
free (free_extsyms);
|
||
return false;
|
||
}
|
||
|
||
/* Delete some bytes from a section while relaxing. */
|
||
|
||
static void
|
||
m68hc11_elf_relax_delete_bytes (abfd, sec, addr, count)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
bfd_vma addr;
|
||
int count;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
unsigned int sec_shndx;
|
||
bfd_byte *contents;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
bfd_vma toaddr;
|
||
Elf_Internal_Sym *isymbuf, *isym, *isymend;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
struct elf_link_hash_entry **end_hashes;
|
||
unsigned int symcount;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
|
||
|
||
sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
|
||
|
||
contents = elf_section_data (sec)->this_hdr.contents;
|
||
|
||
toaddr = sec->_cooked_size;
|
||
|
||
irel = elf_section_data (sec)->relocs;
|
||
irelend = irel + sec->reloc_count;
|
||
|
||
/* Actually delete the bytes. */
|
||
memmove (contents + addr, contents + addr + count,
|
||
(size_t) (toaddr - addr - count));
|
||
|
||
sec->_cooked_size -= count;
|
||
|
||
/* Adjust all the relocs. */
|
||
for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
|
||
{
|
||
unsigned char code;
|
||
unsigned char offset;
|
||
unsigned short raddr;
|
||
unsigned long old_offset;
|
||
int branch_pos;
|
||
|
||
old_offset = irel->r_offset;
|
||
|
||
/* See if this reloc was for the bytes we have deleted, in which
|
||
case we no longer care about it. Don't delete relocs which
|
||
represent addresses, though. */
|
||
if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP
|
||
&& irel->r_offset >= addr && irel->r_offset < addr + count)
|
||
irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
|
||
R_M68HC11_NONE);
|
||
|
||
if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE)
|
||
continue;
|
||
|
||
/* Get the new reloc address. */
|
||
if ((irel->r_offset > addr
|
||
&& irel->r_offset < toaddr))
|
||
irel->r_offset -= count;
|
||
|
||
/* If this is a PC relative reloc, see if the range it covers
|
||
includes the bytes we have deleted. */
|
||
switch (ELF32_R_TYPE (irel->r_info))
|
||
{
|
||
default:
|
||
break;
|
||
|
||
case R_M68HC11_RL_JUMP:
|
||
code = bfd_get_8 (abfd, contents + irel->r_offset);
|
||
switch (code)
|
||
{
|
||
/* jsr and jmp instruction are also marked with RL_JUMP
|
||
relocs but no adjustment must be made. */
|
||
case 0x7e:
|
||
case 0x9d:
|
||
case 0xbd:
|
||
continue;
|
||
|
||
case 0x12:
|
||
case 0x13:
|
||
branch_pos = 3;
|
||
raddr = 4;
|
||
|
||
/* Special case when we translate a brclr N,y into brclr *<addr>
|
||
In this case, the 0x18 page2 prefix is removed.
|
||
The reloc offset is not modified but the instruction
|
||
size is reduced by 1. */
|
||
if (old_offset == addr)
|
||
raddr++;
|
||
break;
|
||
|
||
case 0x1e:
|
||
case 0x1f:
|
||
branch_pos = 3;
|
||
raddr = 4;
|
||
break;
|
||
|
||
case 0x18:
|
||
branch_pos = 4;
|
||
raddr = 5;
|
||
break;
|
||
|
||
default:
|
||
branch_pos = 1;
|
||
raddr = 2;
|
||
break;
|
||
}
|
||
offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos);
|
||
raddr += old_offset;
|
||
raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0));
|
||
if (irel->r_offset < addr && raddr >= addr)
|
||
{
|
||
offset -= count;
|
||
bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
|
||
}
|
||
else if (irel->r_offset >= addr && raddr <= addr)
|
||
{
|
||
offset += count;
|
||
bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
|
||
}
|
||
else
|
||
{
|
||
/*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr,
|
||
irel->r_offset, addr);*/
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Adjust the local symbols defined in this section. */
|
||
isymend = isymbuf + symtab_hdr->sh_info;
|
||
for (isym = isymbuf; 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;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Look through the relocs for a section during the first phase.
|
||
Since we don't do .gots or .plts, we just need to consider the
|
||
virtual table relocs for gc. */
|
||
|
||
static boolean
|
||
elf32_m68hc11_check_relocs (abfd, info, sec, relocs)
|
||
bfd * abfd;
|
||
struct bfd_link_info * info;
|
||
asection * sec;
|
||
const Elf_Internal_Rela * relocs;
|
||
{
|
||
Elf_Internal_Shdr * symtab_hdr;
|
||
struct elf_link_hash_entry ** sym_hashes;
|
||
struct elf_link_hash_entry ** sym_hashes_end;
|
||
const Elf_Internal_Rela * rel;
|
||
const Elf_Internal_Rela * rel_end;
|
||
|
||
if (info->relocateable)
|
||
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];
|
||
|
||
switch (ELF32_R_TYPE (rel->r_info))
|
||
{
|
||
/* This relocation describes the C++ object vtable hierarchy.
|
||
Reconstruct it for later use during GC. */
|
||
case R_M68HC11_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_M68HC11_GNU_VTENTRY:
|
||
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
|
||
return false;
|
||
break;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Relocate a 68hc11/68hc12 ELF section. */
|
||
static boolean
|
||
elf32_m68hc11_relocate_section (output_bfd, info, input_bfd, input_section,
|
||
contents, relocs, local_syms, local_sections)
|
||
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;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
struct elf_link_hash_entry **sym_hashes;
|
||
Elf_Internal_Rela *rel, *relend;
|
||
const char *name;
|
||
|
||
symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
|
||
sym_hashes = elf_sym_hashes (input_bfd);
|
||
|
||
rel = relocs;
|
||
relend = relocs + input_section->reloc_count;
|
||
for (; rel < relend; rel++)
|
||
{
|
||
int r_type;
|
||
reloc_howto_type *howto;
|
||
unsigned long r_symndx;
|
||
Elf_Internal_Sym *sym;
|
||
asection *sec;
|
||
struct elf_link_hash_entry *h;
|
||
bfd_vma relocation;
|
||
bfd_reloc_status_type r;
|
||
|
||
r_symndx = ELF32_R_SYM (rel->r_info);
|
||
r_type = ELF32_R_TYPE (rel->r_info);
|
||
|
||
if (r_type == R_M68HC11_GNU_VTENTRY
|
||
|| r_type == R_M68HC11_GNU_VTINHERIT )
|
||
continue;
|
||
|
||
howto = elf_m68hc11_howto_table + r_type;
|
||
|
||
if (info->relocateable)
|
||
{
|
||
/* This is a relocateable link. We don't have to change
|
||
anything, unless the reloc is against a section symbol,
|
||
in which case we have to adjust according to where the
|
||
section symbol winds up in the output section. */
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
|
||
{
|
||
sec = local_sections[r_symndx];
|
||
rel->r_addend += sec->output_offset + sym->st_value;
|
||
}
|
||
}
|
||
|
||
continue;
|
||
}
|
||
|
||
/* This is a final link. */
|
||
h = NULL;
|
||
sym = NULL;
|
||
sec = NULL;
|
||
if (r_symndx < symtab_hdr->sh_info)
|
||
{
|
||
sym = local_syms + r_symndx;
|
||
sec = local_sections[r_symndx];
|
||
relocation = (sec->output_section->vma
|
||
+ sec->output_offset
|
||
+ sym->st_value);
|
||
}
|
||
else
|
||
{
|
||
h = sym_hashes[r_symndx - symtab_hdr->sh_info];
|
||
while (h->root.type == bfd_link_hash_indirect
|
||
|| h->root.type == bfd_link_hash_warning)
|
||
h = (struct elf_link_hash_entry *) h->root.u.i.link;
|
||
if (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
{
|
||
sec = h->root.u.def.section;
|
||
relocation = (h->root.u.def.value
|
||
+ sec->output_section->vma
|
||
+ sec->output_offset);
|
||
}
|
||
else if (h->root.type == bfd_link_hash_undefweak)
|
||
relocation = 0;
|
||
else
|
||
{
|
||
if (!((*info->callbacks->undefined_symbol)
|
||
(info, h->root.root.string, input_bfd,
|
||
input_section, rel->r_offset, true)))
|
||
return false;
|
||
relocation = 0;
|
||
}
|
||
}
|
||
|
||
if (h != NULL)
|
||
name = h->root.root.string;
|
||
else
|
||
{
|
||
name = (bfd_elf_string_from_elf_section
|
||
(input_bfd, symtab_hdr->sh_link, sym->st_name));
|
||
if (name == NULL || *name == '\0')
|
||
name = bfd_section_name (input_bfd, sec);
|
||
}
|
||
|
||
r = _bfd_final_link_relocate (howto, input_bfd, input_section,
|
||
contents, rel->r_offset,
|
||
relocation, rel->r_addend);
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
const char * msg = (const char *) 0;
|
||
|
||
switch (r)
|
||
{
|
||
case bfd_reloc_overflow:
|
||
if (!((*info->callbacks->reloc_overflow)
|
||
(info, name, howto->name, (bfd_vma) 0,
|
||
input_bfd, input_section, rel->r_offset)))
|
||
return false;
|
||
break;
|
||
|
||
case bfd_reloc_undefined:
|
||
if (!((*info->callbacks->undefined_symbol)
|
||
(info, name, input_bfd, input_section,
|
||
rel->r_offset, true)))
|
||
return false;
|
||
break;
|
||
|
||
case bfd_reloc_outofrange:
|
||
msg = _ ("internal error: out of range error");
|
||
goto common_error;
|
||
|
||
case bfd_reloc_notsupported:
|
||
msg = _ ("internal error: unsupported relocation error");
|
||
goto common_error;
|
||
|
||
case bfd_reloc_dangerous:
|
||
msg = _ ("internal error: dangerous error");
|
||
goto common_error;
|
||
|
||
default:
|
||
msg = _ ("internal error: unknown error");
|
||
/* fall through */
|
||
|
||
common_error:
|
||
if (!((*info->callbacks->warning)
|
||
(info, msg, name, input_bfd, input_section,
|
||
rel->r_offset)))
|
||
return false;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
|
||
|
||
/* Set and control ELF flags in ELF header. */
|
||
|
||
boolean
|
||
_bfd_m68hc11_elf_set_private_flags (abfd, flags)
|
||
bfd *abfd;
|
||
flagword flags;
|
||
{
|
||
BFD_ASSERT (!elf_flags_init (abfd)
|
||
|| elf_elfheader (abfd)->e_flags == flags);
|
||
|
||
elf_elfheader (abfd)->e_flags = flags;
|
||
elf_flags_init (abfd) = true;
|
||
return true;
|
||
}
|
||
|
||
/* Merge backend specific data from an object file to the output
|
||
object file when linking. */
|
||
|
||
boolean
|
||
_bfd_m68hc11_elf_merge_private_bfd_data (ibfd, obfd)
|
||
bfd *ibfd;
|
||
bfd *obfd;
|
||
{
|
||
flagword old_flags;
|
||
flagword new_flags;
|
||
boolean ok = true;
|
||
|
||
/* Check if we have the same endianess */
|
||
if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
|
||
return false;
|
||
|
||
if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
|
||
|| bfd_get_flavour (obfd) != bfd_target_elf_flavour)
|
||
return true;
|
||
|
||
new_flags = elf_elfheader (ibfd)->e_flags;
|
||
elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI;
|
||
old_flags = elf_elfheader (obfd)->e_flags;
|
||
|
||
if (! elf_flags_init (obfd))
|
||
{
|
||
elf_flags_init (obfd) = true;
|
||
elf_elfheader (obfd)->e_flags = new_flags;
|
||
elf_elfheader (obfd)->e_ident[EI_CLASS]
|
||
= elf_elfheader (ibfd)->e_ident[EI_CLASS];
|
||
|
||
if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
|
||
&& bfd_get_arch_info (obfd)->the_default)
|
||
{
|
||
if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
|
||
bfd_get_mach (ibfd)))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Check ABI compatibility. */
|
||
if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: linking files compiled for 16-bit integers (-mshort) "
|
||
"and others for 32-bit integers"),
|
||
bfd_archive_filename (ibfd));
|
||
ok = false;
|
||
}
|
||
if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64))
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: linking files compiled for 32-bit double (-fshort-double) "
|
||
"and others for 64-bit double"),
|
||
bfd_archive_filename (ibfd));
|
||
ok = false;
|
||
}
|
||
new_flags &= ~EF_M68HC11_ABI;
|
||
old_flags &= ~EF_M68HC11_ABI;
|
||
|
||
/* Warn about any other mismatches */
|
||
if (new_flags != old_flags)
|
||
{
|
||
(*_bfd_error_handler)
|
||
(_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
|
||
bfd_archive_filename (ibfd), (unsigned long) new_flags,
|
||
(unsigned long) old_flags);
|
||
ok = false;
|
||
}
|
||
|
||
if (! ok)
|
||
{
|
||
bfd_set_error (bfd_error_bad_value);
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
boolean
|
||
_bfd_m68hc11_elf_print_private_bfd_data (abfd, ptr)
|
||
bfd *abfd;
|
||
PTR ptr;
|
||
{
|
||
FILE *file = (FILE *) ptr;
|
||
|
||
BFD_ASSERT (abfd != NULL && ptr != NULL);
|
||
|
||
/* Print normal ELF private data. */
|
||
_bfd_elf_print_private_bfd_data (abfd, ptr);
|
||
|
||
/* xgettext:c-format */
|
||
fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
|
||
|
||
if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32)
|
||
fprintf (file, _("[abi=32-bit int,"));
|
||
else
|
||
fprintf (file, _("[abi=16-bit int,"));
|
||
|
||
if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64)
|
||
fprintf (file, _(" 64-bit double]"));
|
||
else
|
||
fprintf (file, _(" 32-bit double]"));
|
||
|
||
if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS)
|
||
fprintf (file, _(" [memory=bank-model]"));
|
||
else
|
||
fprintf (file, _(" [memory=flat]"));
|
||
|
||
fputc ('\n', file);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Below is the only difference between elf32-m68hc12.c and elf32-m68hc11.c.
|
||
The Motorola spec says to use a different Elf machine code. */
|
||
#define ELF_ARCH bfd_arch_m68hc11
|
||
#define ELF_MACHINE_CODE EM_68HC11
|
||
#define ELF_MAXPAGESIZE 0x1000
|
||
|
||
#define TARGET_BIG_SYM bfd_elf32_m68hc11_vec
|
||
#define TARGET_BIG_NAME "elf32-m68hc11"
|
||
|
||
#define elf_info_to_howto 0
|
||
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
|
||
#define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section
|
||
#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
|
||
#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
|
||
#define elf_backend_check_relocs elf32_m68hc11_check_relocs
|
||
#define elf_backend_relocate_section elf32_m68hc11_relocate_section
|
||
#define elf_backend_object_p 0
|
||
#define elf_backend_final_write_processing 0
|
||
#define elf_backend_can_gc_sections 1
|
||
#define bfd_elf32_bfd_merge_private_bfd_data \
|
||
_bfd_m68hc11_elf_merge_private_bfd_data
|
||
#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
|
||
#define bfd_elf32_bfd_print_private_bfd_data \
|
||
_bfd_m68hc11_elf_print_private_bfd_data
|
||
|
||
#include "elf32-target.h"
|