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NetBSD/gnu/dist/toolchain/bfd/elf32-cris.c

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Import binutils 2.11.
2001-04-23 16:24:25 +04:00
/* CRIS-specific support for 32-bit ELF.
Copyright (C) 2000 Free Software Foundation, Inc.
Contributed by Axis Communications AB.
Written by Hans-Peter Nilsson, based on elf32-fr30.c
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 "libbfd.h"
#include "elf-bfd.h"
#include "elf/cris.h"
/* Forward declarations. */
static reloc_howto_type * cris_reloc_type_lookup
PARAMS ((bfd *abfd, bfd_reloc_code_real_type code));
static void cris_info_to_howto_rela
PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static boolean cris_elf_relocate_section
PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static bfd_reloc_status_type cris_final_link_relocate
PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, bfd_vma));
static boolean cris_elf_gc_sweep_hook
PARAMS ((bfd *, struct bfd_link_info *, asection *,
const Elf_Internal_Rela *));
static asection * cris_elf_gc_mark_hook
PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
struct elf_link_hash_entry *, Elf_Internal_Sym *));
static boolean cris_elf_object_p PARAMS ((bfd *));
static void cris_elf_final_write_processing PARAMS ((bfd *, boolean));
static boolean cris_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
static boolean cris_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
static reloc_howto_type cris_elf_howto_table [] =
{
/* This reloc does nothing. */
HOWTO (R_CRIS_NONE, /* 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_CRIS_NONE", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* An 8 bit absolute relocation. */
HOWTO (R_CRIS_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_CRIS_8", /* name */
false, /* partial_inplace */
0x0000, /* src_mask */
0x00ff, /* dst_mask */
false), /* pcrel_offset */
/* A 16 bit absolute relocation. */
HOWTO (R_CRIS_16, /* 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_CRIS_16", /* name */
false, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
false), /* pcrel_offset */
/* A 32 bit absolute relocation. */
HOWTO (R_CRIS_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_CRIS_32", /* name */
false, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* An 8 bit absolute relocation. */
HOWTO (R_CRIS_8_PCREL, /* 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_CRIS_8_PCREL", /* name */
false, /* partial_inplace */
0x0000, /* src_mask */
0x00ff, /* dst_mask */
false), /* pcrel_offset */
/* A 16 bit absolute relocation. */
HOWTO (R_CRIS_16_PCREL, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRIS_16", /* name */
false, /* partial_inplace */
0x00000000, /* src_mask */
0x0000ffff, /* dst_mask */
false), /* pcrel_offset */
/* A 32 bit absolute relocation. */
HOWTO (R_CRIS_32_PCREL, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_CRIS_32", /* name */
false, /* partial_inplace */
0x00000000, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_CRIS_GNU_VTINHERIT, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
NULL, /* special_function */
"R_CRIS_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_CRIS_GNU_VTENTRY, /* type */
0, /* rightshift */
2, /* 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_CRIS_GNU_VTENTRY", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false) /* pcrel_offset */
};
/* Map BFD reloc types to CRIS ELF reloc types. */
struct cris_reloc_map
{
bfd_reloc_code_real_type bfd_reloc_val;
unsigned int cris_reloc_val;
};
static const struct cris_reloc_map cris_reloc_map [] =
{
{ BFD_RELOC_NONE, R_CRIS_NONE },
{ BFD_RELOC_8, R_CRIS_8 },
{ BFD_RELOC_16, R_CRIS_16 },
{ BFD_RELOC_32, R_CRIS_32 },
{ BFD_RELOC_8_PCREL, R_CRIS_8_PCREL },
{ BFD_RELOC_16_PCREL, R_CRIS_16_PCREL },
{ BFD_RELOC_32_PCREL, R_CRIS_32_PCREL },
{ BFD_RELOC_VTABLE_INHERIT, R_CRIS_GNU_VTINHERIT },
{ BFD_RELOC_VTABLE_ENTRY, R_CRIS_GNU_VTENTRY }
};
static reloc_howto_type *
cris_reloc_type_lookup (abfd, code)
bfd * abfd ATTRIBUTE_UNUSED;
bfd_reloc_code_real_type code;
{
unsigned int i;
for (i = sizeof (cris_reloc_map) / sizeof (cris_reloc_map[0]);
--i;)
if (cris_reloc_map [i].bfd_reloc_val == code)
return & cris_elf_howto_table [cris_reloc_map[i].cris_reloc_val];
return NULL;
}
/* Set the howto pointer for an CRIS ELF reloc. */
static void
cris_info_to_howto_rela (abfd, cache_ptr, dst)
bfd * abfd ATTRIBUTE_UNUSED;
arelent * cache_ptr;
Elf32_Internal_Rela * dst;
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
BFD_ASSERT (r_type < (unsigned int) R_CRIS_max);
cache_ptr->howto = & cris_elf_howto_table [r_type];
}
/* Perform a single relocation. By default we use the standard BFD
routines, but we might have to do a few relocs ourselves in the future. */
static bfd_reloc_status_type
cris_final_link_relocate (howto, input_bfd, input_section, contents, rel,
relocation)
reloc_howto_type * howto;
bfd * input_bfd;
asection * input_section;
bfd_byte * contents;
Elf_Internal_Rela * rel;
bfd_vma relocation;
{
bfd_reloc_status_type r
= _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, rel->r_addend);
return r;
}
/* Relocate an CRIS ELF section. See elf32-fr30.c, from where this was
copied, for further comments. */
static boolean
cris_elf_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;
Elf_Internal_Rela * relend;
symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (input_bfd);
relend = relocs + input_section->reloc_count;
/* It seems this can happen with erroneous or unsupported input (mixing
a.out and elf in an archive, for example.) */
if (sym_hashes == NULL)
return false;
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 = NULL;
int r_type;
r_type = ELF32_R_TYPE (rel->r_info);
if ( r_type == R_CRIS_GNU_VTINHERIT
|| r_type == R_CRIS_GNU_VTENTRY)
continue;
r_symndx = ELF32_R_SYM (rel->r_info);
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. */
howto = cris_elf_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 = (sec->output_section->vma
+ sec->output_offset
+ sym->st_value);
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;
#if 0
fprintf (stderr, "local: sec: %s, sym: %s (%d), value: %x + %x + %x addend %x\n",
sec->name, name, sym->st_name,
sec->output_section->vma, sec->output_offset,
sym->st_value, rel->r_addend);
#endif
}
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;
name = h->root.root.string;
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);
#if 0
fprintf (stderr,
"defined: sec: %s, name: %s, value: %x + %x + %x gives: %x\n",
sec->name, name, h->root.u.def.value,
sec->output_section->vma, sec->output_offset, relocation);
#endif
}
else if (h->root.type == bfd_link_hash_undefweak)
{
#if 0
fprintf (stderr, "undefined: sec: %s, name: %s\n",
sec->name, name);
#endif
relocation = 0;
}
else if (info->shared
&& ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
relocation = 0;
else
{
if (! ((*info->callbacks->undefined_symbol)
(info, h->root.root.string, input_bfd,
input_section, rel->r_offset, true)))
return false;
#if 0
fprintf (stderr, "unknown: name: %s\n", name);
#endif
relocation = 0;
}
}
r = cris_final_link_relocate (howto, input_bfd, input_section,
contents, rel, relocation);
if (r != bfd_reloc_ok)
{
const char * msg = (const char *) NULL;
switch (r)
{
case bfd_reloc_overflow:
r = info->callbacks->reloc_overflow
(info, 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;
}
/* Return the section that should be marked against GC for a given
relocation. */
static asection *
cris_elf_gc_mark_hook (abfd, info, rel, h, sym)
bfd * abfd;
struct bfd_link_info * info ATTRIBUTE_UNUSED;
Elf_Internal_Rela * rel;
struct elf_link_hash_entry * h;
Elf_Internal_Sym * sym;
{
if (h != NULL)
{
switch (ELF32_R_TYPE (rel->r_info))
{
case R_CRIS_GNU_VTINHERIT:
case R_CRIS_GNU_VTENTRY:
break;
default:
switch (h->root.type)
{
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
return h->root.u.def.section;
case bfd_link_hash_common:
return h->root.u.c.p->section;
default:
break;
}
}
}
else
{
if (!(elf_bad_symtab (abfd)
&& ELF_ST_BIND (sym->st_info) != STB_LOCAL)
&& ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
&& sym->st_shndx != SHN_COMMON))
{
return bfd_section_from_elf_index (abfd, sym->st_shndx);
}
}
return NULL;
}
/* Update the got entry reference counts for the section being removed. */
static boolean
cris_elf_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;
{
return true;
}
/* Look through the relocs for a section during the first phase.
Since we don't do .gots or .plts, we just need to consider the
virtual table relocs for gc. */
static boolean
cris_elf_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, **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_CRIS_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_CRIS_GNU_VTENTRY:
if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
return false;
break;
}
}
return true;
}
/* Reject a file depending on underscores on symbols. */
static boolean
cris_elf_object_p (abfd)
bfd *abfd;
{
if ((elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE))
return (bfd_get_symbol_leading_char (abfd) == '_');
else
return (bfd_get_symbol_leading_char (abfd) == 0);
}
/* Mark presence or absence of leading underscore. */
static void
cris_elf_final_write_processing (abfd, linker)
bfd *abfd;
boolean linker ATTRIBUTE_UNUSED;
{
if (bfd_get_symbol_leading_char (abfd) == '_')
elf_elfheader (abfd)->e_flags |= EF_CRIS_UNDERSCORE;
else
elf_elfheader (abfd)->e_flags &= ~EF_CRIS_UNDERSCORE;
}
/* Display the flags field. */
static boolean
cris_elf_print_private_bfd_data (abfd, ptr)
bfd *abfd;
PTR ptr;
{
FILE *file = (FILE *) ptr;
BFD_ASSERT (abfd != NULL && ptr != NULL)
_bfd_elf_print_private_bfd_data (abfd, ptr);
fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags);
if (elf_elfheader (abfd)->e_flags & EF_CRIS_UNDERSCORE)
fprintf (file, _(" [symbols have a _ prefix]"));
fputc ('\n', file);
return true;
}
/* Don't mix files with and without a leading underscore. */
static boolean
cris_elf_merge_private_bfd_data (ibfd, obfd)
bfd *ibfd;
bfd *obfd;
{
flagword old_flags, new_flags;
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;
if (! elf_flags_init (obfd))
{
/* This happens when ld starts out with a 'blank' output file. */
elf_flags_init (obfd) = true;
/* Set flags according to current bfd_target. */
cris_elf_final_write_processing (obfd, false);
}
old_flags = elf_elfheader (obfd)->e_flags;
new_flags = elf_elfheader (ibfd)->e_flags;
/* Is this good or bad? We'll follow with other excluding flags. */
if ((old_flags & EF_CRIS_UNDERSCORE) != (new_flags & EF_CRIS_UNDERSCORE))
{
(*_bfd_error_handler)
((new_flags & EF_CRIS_UNDERSCORE)
? _("%s: uses _-prefixed symbols, but writing file with non-prefixed symbols")
: _("%s: uses non-prefixed symbols, but writing file with _-prefixed symbols"),
bfd_get_filename (ibfd));
bfd_set_error (bfd_error_bad_value);
return false;
}
return true;
}
#define ELF_ARCH bfd_arch_cris
#define ELF_MACHINE_CODE EM_CRIS
#define ELF_MAXPAGESIZE 0x2000
#define TARGET_LITTLE_SYM bfd_elf32_cris_vec
#define TARGET_LITTLE_NAME "elf32-cris"
#define elf_symbol_leading_char 0
#define elf_info_to_howto_rel NULL
#define elf_info_to_howto cris_info_to_howto_rela
#define elf_backend_relocate_section cris_elf_relocate_section
#define elf_backend_gc_mark_hook cris_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook cris_elf_gc_sweep_hook
#define elf_backend_check_relocs cris_elf_check_relocs
#define elf_backend_can_gc_sections 1
#define elf_backend_object_p cris_elf_object_p
#define elf_backend_final_write_processing \
cris_elf_final_write_processing
#define bfd_elf32_bfd_print_private_bfd_data \
cris_elf_print_private_bfd_data
#define bfd_elf32_bfd_merge_private_bfd_data \
cris_elf_merge_private_bfd_data
#define bfd_elf32_bfd_reloc_type_lookup cris_reloc_type_lookup
/* Later, we my want to optimize RELA entries into REL entries for dynamic
linking and libraries (if it's a win of any significance). Until then,
take the easy route. */
#define elf_backend_may_use_rel_p 0
#define elf_backend_may_use_rela_p 1
#include "elf32-target.h"
#define INCLUDED_TARGET_FILE
#undef TARGET_LITTLE_SYM
#undef TARGET_LITTLE_NAME
#undef elf_symbol_leading_char
#define TARGET_LITTLE_SYM bfd_elf32_us_cris_vec
#define TARGET_LITTLE_NAME "elf32-us-cris"
#define elf_symbol_leading_char '_'
#include "elf32-target.h"
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