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Projet_SETI_RISC-V/riscv-gnu-toolchain/gdb/bfd/elf32-mt.c

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projet
2023-03-06 14:48:14 +01:00
/* Morpho Technologies MT specific support for 32-bit ELF
Copyright (C) 2001-2022 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 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., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/mt.h"
/* Prototypes. */
static reloc_howto_type * mt_reloc_type_lookup
(bfd *, bfd_reloc_code_real_type);
static bool mt_info_to_howto_rela
(bfd *, arelent *, Elf_Internal_Rela *);
static bfd_reloc_status_type mt_elf_relocate_hi16
(bfd *, Elf_Internal_Rela *, bfd_byte *, bfd_vma);
static bfd_reloc_status_type mt_final_link_relocate
(reloc_howto_type *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, bfd_vma);
static int mt_elf_relocate_section
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
/* Relocation tables. */
static reloc_howto_type mt_elf_howto_table [] =
{
/* This reloc does nothing. */
HOWTO (R_MT_NONE, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_NONE", /* name */
false, /* partial_inplace */
0 , /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
/* A 16 bit absolute relocation. */
HOWTO (R_MT_16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_16", /* name */
false, /* partial_inplace */
0 , /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* A 32 bit absolute relocation. */
HOWTO (R_MT_32, /* 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_MT_32", /* name */
false, /* partial_inplace */
0 , /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* A 32 bit pc-relative relocation. */
HOWTO (R_MT_32_PCREL, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_32_PCREL", /* name */
false, /* partial_inplace */
0 , /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* A 16 bit pc-relative relocation. */
HOWTO (R_MT_PC16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_PC16", /* name */
false, /* partial_inplace */
0, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* high 16 bits of symbol value. */
HOWTO (R_MT_HI16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_HI16", /* name */
false, /* partial_inplace */
0xffff0000, /* src_mask */
0xffff0000, /* dst_mask */
false), /* pcrel_offset */
/* Low 16 bits of symbol value. */
HOWTO (R_MT_LO16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
bfd_elf_generic_reloc, /* special_function */
"R_MT_LO16", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
};
/* Map BFD reloc types to MT ELF reloc types. */
static reloc_howto_type *
mt_reloc_type_lookup
(bfd * abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
/* Note that the mt_elf_howto_table is indxed by the R_
constants. Thus, the order that the howto records appear in the
table *must* match the order of the relocation types defined in
include/elf/mt.h. */
switch (code)
{
case BFD_RELOC_NONE:
return &mt_elf_howto_table[ (int) R_MT_NONE];
case BFD_RELOC_16:
return &mt_elf_howto_table[ (int) R_MT_16];
case BFD_RELOC_32:
return &mt_elf_howto_table[ (int) R_MT_32];
case BFD_RELOC_32_PCREL:
return &mt_elf_howto_table[ (int) R_MT_32_PCREL];
case BFD_RELOC_16_PCREL:
return &mt_elf_howto_table[ (int) R_MT_PC16];
case BFD_RELOC_HI16:
return &mt_elf_howto_table[ (int) R_MT_HI16];
case BFD_RELOC_LO16:
return &mt_elf_howto_table[ (int) R_MT_LO16];
default:
/* Pacify gcc -Wall. */
return NULL;
}
return NULL;
}
static reloc_howto_type *
mt_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (mt_elf_howto_table) / sizeof (mt_elf_howto_table[0]);
i++)
if (mt_elf_howto_table[i].name != NULL
&& strcasecmp (mt_elf_howto_table[i].name, r_name) == 0)
return &mt_elf_howto_table[i];
return NULL;
}
bfd_reloc_status_type
mt_elf_relocate_hi16
(bfd * input_bfd,
Elf_Internal_Rela * relhi,
bfd_byte * contents,
bfd_vma value)
{
bfd_vma insn;
insn = bfd_get_32 (input_bfd, contents + relhi->r_offset);
value += relhi->r_addend;
value >>= 16;
insn = ((insn & ~0xFFFF) | value);
bfd_put_32 (input_bfd, insn, contents + relhi->r_offset);
return bfd_reloc_ok;
}
/* XXX: The following code is the result of a cut&paste. This unfortunate
practice is very widespread in the various target back-end files. */
/* Set the howto pointer for a MT ELF reloc. */
static bool
mt_info_to_howto_rela (bfd *abfd,
arelent *cache_ptr,
Elf_Internal_Rela *dst)
{
unsigned int r_type;
r_type = ELF32_R_TYPE (dst->r_info);
if (r_type >= (unsigned int) R_MT_max)
{
/* xgettext:c-format */
_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
abfd, r_type);
bfd_set_error (bfd_error_bad_value);
return false;
}
cache_ptr->howto = & mt_elf_howto_table [r_type];
return true;
}
/* Perform a single relocation. By default we use the standard BFD
routines. */
static bfd_reloc_status_type
mt_final_link_relocate
(reloc_howto_type * howto,
bfd * input_bfd,
asection * input_section,
bfd_byte * contents,
Elf_Internal_Rela * rel,
bfd_vma relocation)
{
return _bfd_final_link_relocate (howto, input_bfd, input_section,
contents, rel->r_offset,
relocation, rel->r_addend);
}
/* Relocate a MT ELF section.
There is some attempt to make this function usable for many architectures,
both USE_REL and USE_RELA ['twould be nice if such a critter existed],
if only to serve as a learning tool.
The RELOCATE_SECTION function is called by the new ELF backend linker
to handle the relocations for a section.
The relocs are always passed as Rela structures; if the section
actually uses Rel structures, the r_addend field will always be
zero.
This function is responsible for adjusting the section contents as
necessary, and (if using Rela relocs and generating a relocatable
output file) adjusting the reloc addend as necessary.
This function does not have to worry about setting the reloc
address or the reloc symbol index.
LOCAL_SYMS is a pointer to the swapped in local symbols.
LOCAL_SECTIONS is an array giving the section in the input file
corresponding to the st_shndx field of each local symbol.
The global hash table entry for the global symbols can be found
via elf_sym_hashes (input_bfd).
When generating relocatable output, this function must handle
STB_LOCAL/STT_SECTION symbols specially. The output symbol is
going to be the section symbol corresponding to the output
section, which means that the addend must be adjusted
accordingly. */
static int
mt_elf_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)
{
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;
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);
r_symndx = ELF32_R_SYM (rel->r_info);
howto = mt_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 = _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 (sec) : name;
}
else
{
bool unresolved_reloc;
bool warned, ignored;
RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
r_symndx, symtab_hdr, sym_hashes,
h, sec, relocation,
unresolved_reloc, warned, ignored);
name = h->root.root.string;
}
if (sec != NULL && discarded_section (sec))
RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
rel, 1, relend, howto, 0, contents);
if (bfd_link_relocatable (info))
continue;
/* Finally, the sole MT-specific part. */
switch (r_type)
{
case R_MT_HI16:
r = mt_elf_relocate_hi16 (input_bfd, rel, contents, relocation);
break;
default:
r = mt_final_link_relocate (howto, input_bfd, input_section,
contents, rel, relocation);
break;
}
if (r != bfd_reloc_ok)
{
const char * msg = (const char *) NULL;
switch (r)
{
case bfd_reloc_overflow:
(*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:
(*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_dangerous:
msg = _("internal error: dangerous relocation");
break;
default:
msg = _("internal error: unknown error");
break;
}
if (msg)
(*info->callbacks->warning) (info, msg, name, input_bfd,
input_section, rel->r_offset);
}
}
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 bool
mt_elf_check_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;
const Elf_Internal_Rela *rel;
const Elf_Internal_Rela *rel_end;
if (bfd_link_relocatable (info))
return true;
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
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;
}
/* Return the MACH for an e_flags value. */
static int
elf32_mt_machine (bfd *abfd)
{
switch (elf_elfheader (abfd)->e_flags & EF_MT_CPU_MASK)
{
case EF_MT_CPU_MRISC: return bfd_mach_ms1;
case EF_MT_CPU_MRISC2: return bfd_mach_mrisc2;
case EF_MT_CPU_MS2: return bfd_mach_ms2;
}
return bfd_mach_ms1;
}
static bool
mt_elf_object_p (bfd *abfd)
{
bfd_default_set_arch_mach (abfd, bfd_arch_mt, elf32_mt_machine (abfd));
return true;
}
/* Function to set the ELF flag bits. */
static bool
mt_elf_set_private_flags (bfd *abfd, flagword 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. */
static bool
mt_elf_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
{
bfd *obfd = info->output_bfd;
flagword old_flags, new_flags;
bool ok = true;
/* Check if we have the same endianness. */
if (!_bfd_generic_verify_endian_match (ibfd, info))
return false;
/* If they're not both mt, then merging is meaningless, so just
don't do it. */
if (strcmp (ibfd->arch_info->arch_name, "mt") != 0)
return true;
if (strcmp (obfd->arch_info->arch_name, "mt") != 0)
return true;
new_flags = elf_elfheader (ibfd)->e_flags;
old_flags = elf_elfheader (obfd)->e_flags;
#ifdef DEBUG
_bfd_error_handler ("%pB: old_flags = 0x%.8x, new_flags = 0x%.8x, init = %s",
ibfd, old_flags, new_flags, elf_flags_init (obfd) ? "yes" : "no");
#endif
if (!elf_flags_init (obfd))
{
old_flags = new_flags;
elf_flags_init (obfd) = true;
}
else if ((new_flags & EF_MT_CPU_MASK) != (old_flags & EF_MT_CPU_MASK))
{
/* CPU has changed. This is invalid, because MRISC, MRISC2 and
MS2 are not subsets of each other. */
ok = false;
}
if (ok)
{
obfd->arch_info = ibfd->arch_info;
elf_elfheader (obfd)->e_flags = old_flags;
}
return ok;
}
static bool
mt_elf_print_private_bfd_data (bfd *abfd, void *ptr)
{
FILE *file = (FILE *) ptr;
flagword flags;
BFD_ASSERT (abfd != NULL && ptr != NULL);
/* Print normal ELF private data. */
_bfd_elf_print_private_bfd_data (abfd, ptr);
flags = elf_elfheader (abfd)->e_flags;
fprintf (file, _("private flags = 0x%lx:"), (unsigned long) flags);
switch (flags & EF_MT_CPU_MASK)
{
default:
case EF_MT_CPU_MRISC: fprintf (file, " ms1-16-002"); break;
case EF_MT_CPU_MRISC2: fprintf (file, " ms1-16-003"); break;
case EF_MT_CPU_MS2: fprintf (file, " ms2"); break;
}
fputc ('\n', file);
return true;
}
#define TARGET_BIG_SYM mt_elf32_vec
#define TARGET_BIG_NAME "elf32-mt"
#define ELF_ARCH bfd_arch_mt
#define ELF_MACHINE_CODE EM_MT
#define ELF_MAXPAGESIZE 1 /* No pages on the MT. */
#define elf_info_to_howto_rel NULL
#define elf_info_to_howto mt_info_to_howto_rela
#define elf_backend_relocate_section mt_elf_relocate_section
#define bfd_elf32_bfd_reloc_type_lookup mt_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup mt_reloc_name_lookup
#define elf_backend_check_relocs mt_elf_check_relocs
#define elf_backend_object_p mt_elf_object_p
#define elf_backend_rela_normal 1
#define elf_backend_can_gc_sections 1
#define bfd_elf32_bfd_set_private_flags mt_elf_set_private_flags
#define bfd_elf32_bfd_merge_private_bfd_data mt_elf_merge_private_bfd_data
#define bfd_elf32_bfd_print_private_bfd_data mt_elf_print_private_bfd_data
#include "elf32-target.h"
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