mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
549 lines
15 KiB
C
549 lines
15 KiB
C
/* BFD back-end for i386 a.out binaries under LynxOS.
|
||
Copyright (C) 1990-2018 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. */
|
||
|
||
#define TEXT_START_ADDR 0
|
||
#define TARGET_PAGE_SIZE 4096
|
||
#define SEGMENT_SIZE TARGET_PAGE_SIZE
|
||
#define DEFAULT_ARCH bfd_arch_i386
|
||
|
||
/* Do not "beautify" the CONCAT* macro args. Traditional C will not
|
||
remove whitespace added here, and thus will fail to concatenate
|
||
the tokens. */
|
||
#define MY(OP) CONCAT2 (i386_aout_lynx_,OP)
|
||
#define TARGETNAME "a.out-i386-lynx"
|
||
|
||
#include "sysdep.h"
|
||
#include "bfd.h"
|
||
#include "libbfd.h"
|
||
|
||
#ifndef WRITE_HEADERS
|
||
#define WRITE_HEADERS(abfd, execp) \
|
||
{ \
|
||
if (adata(abfd).magic == undecided_magic) \
|
||
NAME(aout,adjust_sizes_and_vmas) (abfd); \
|
||
\
|
||
execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE; \
|
||
execp->a_entry = bfd_get_start_address (abfd); \
|
||
\
|
||
execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * \
|
||
obj_reloc_entry_size (abfd)); \
|
||
execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * \
|
||
obj_reloc_entry_size (abfd)); \
|
||
NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes); \
|
||
\
|
||
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 \
|
||
|| bfd_bwrite (&exec_bytes, (bfd_size_type) EXEC_BYTES_SIZE, \
|
||
abfd) != EXEC_BYTES_SIZE) \
|
||
return FALSE; \
|
||
/* Now write out reloc info, followed by syms and strings */ \
|
||
\
|
||
if (bfd_get_symcount (abfd) != 0) \
|
||
{ \
|
||
if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (execp)), SEEK_SET) \
|
||
!= 0) \
|
||
return FALSE; \
|
||
\
|
||
if (! NAME(aout,write_syms) (abfd)) return FALSE; \
|
||
\
|
||
if (bfd_seek (abfd, (file_ptr) (N_TRELOFF (execp)), SEEK_SET) \
|
||
!= 0) \
|
||
return FALSE; \
|
||
\
|
||
if (!NAME(lynx,squirt_out_relocs) (abfd, obj_textsec (abfd))) \
|
||
return FALSE; \
|
||
if (bfd_seek (abfd, (file_ptr) (N_DRELOFF (execp)), SEEK_SET) \
|
||
!= 0) \
|
||
return 0; \
|
||
\
|
||
if (!NAME(lynx,squirt_out_relocs) (abfd, obj_datasec (abfd))) \
|
||
return FALSE; \
|
||
} \
|
||
}
|
||
#endif
|
||
|
||
#include "libaout.h"
|
||
#include "aout/aout64.h"
|
||
|
||
|
||
#ifdef LYNX_CORE
|
||
|
||
char *lynx_core_file_failing_command ();
|
||
int lynx_core_file_failing_signal ();
|
||
bfd_boolean lynx_core_file_matches_executable_p ();
|
||
const bfd_target *lynx_core_file_p ();
|
||
|
||
#define MY_core_file_failing_command lynx_core_file_failing_command
|
||
#define MY_core_file_failing_signal lynx_core_file_failing_signal
|
||
#define MY_core_file_matches_executable_p lynx_core_file_matches_executable_p
|
||
#define MY_core_file_p lynx_core_file_p
|
||
|
||
#endif /* LYNX_CORE */
|
||
|
||
|
||
#define KEEPIT udata.i
|
||
|
||
extern reloc_howto_type aout_32_ext_howto_table[];
|
||
extern reloc_howto_type aout_32_std_howto_table[];
|
||
|
||
/* Standard reloc stuff */
|
||
/* Output standard relocation information to a file in target byte order. */
|
||
|
||
static void
|
||
NAME(lynx,swap_std_reloc_out) (bfd *abfd,
|
||
arelent *g,
|
||
struct reloc_std_external *natptr)
|
||
{
|
||
int r_index;
|
||
asymbol *sym = *(g->sym_ptr_ptr);
|
||
int r_extern;
|
||
unsigned int r_length;
|
||
int r_pcrel;
|
||
int r_baserel, r_jmptable, r_relative;
|
||
asection *output_section = sym->section->output_section;
|
||
|
||
PUT_WORD (abfd, g->address, natptr->r_address);
|
||
|
||
r_length = g->howto->size; /* Size as a power of two */
|
||
r_pcrel = (int) g->howto->pc_relative; /* Relative to PC? */
|
||
/* r_baserel, r_jmptable, r_relative??? FIXME-soon */
|
||
r_baserel = 0;
|
||
r_jmptable = 0;
|
||
r_relative = 0;
|
||
|
||
/* name was clobbered by aout_write_syms to be symbol index */
|
||
|
||
/* If this relocation is relative to a symbol then set the
|
||
r_index to the symbols index, and the r_extern bit.
|
||
|
||
Absolute symbols can come in in two ways, either as an offset
|
||
from the abs section, or as a symbol which has an abs value.
|
||
check for that here
|
||
*/
|
||
|
||
if (bfd_is_com_section (output_section)
|
||
|| bfd_is_abs_section (output_section)
|
||
|| bfd_is_und_section (output_section))
|
||
{
|
||
if (bfd_abs_section_ptr->symbol == sym)
|
||
{
|
||
/* Whoops, looked like an abs symbol, but is really an offset
|
||
from the abs section */
|
||
r_index = 0;
|
||
r_extern = 0;
|
||
}
|
||
else
|
||
{
|
||
/* Fill in symbol */
|
||
r_extern = 1;
|
||
r_index = (*g->sym_ptr_ptr)->KEEPIT;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Just an ordinary section */
|
||
r_extern = 0;
|
||
r_index = output_section->target_index;
|
||
}
|
||
|
||
/* now the fun stuff */
|
||
if (bfd_header_big_endian (abfd))
|
||
{
|
||
natptr->r_index[0] = r_index >> 16;
|
||
natptr->r_index[1] = r_index >> 8;
|
||
natptr->r_index[2] = r_index;
|
||
natptr->r_type[0] =
|
||
(r_extern ? RELOC_STD_BITS_EXTERN_BIG : 0)
|
||
| (r_pcrel ? RELOC_STD_BITS_PCREL_BIG : 0)
|
||
| (r_baserel ? RELOC_STD_BITS_BASEREL_BIG : 0)
|
||
| (r_jmptable ? RELOC_STD_BITS_JMPTABLE_BIG : 0)
|
||
| (r_relative ? RELOC_STD_BITS_RELATIVE_BIG : 0)
|
||
| (r_length << RELOC_STD_BITS_LENGTH_SH_BIG);
|
||
}
|
||
else
|
||
{
|
||
natptr->r_index[2] = r_index >> 16;
|
||
natptr->r_index[1] = r_index >> 8;
|
||
natptr->r_index[0] = r_index;
|
||
natptr->r_type[0] =
|
||
(r_extern ? RELOC_STD_BITS_EXTERN_LITTLE : 0)
|
||
| (r_pcrel ? RELOC_STD_BITS_PCREL_LITTLE : 0)
|
||
| (r_baserel ? RELOC_STD_BITS_BASEREL_LITTLE : 0)
|
||
| (r_jmptable ? RELOC_STD_BITS_JMPTABLE_LITTLE : 0)
|
||
| (r_relative ? RELOC_STD_BITS_RELATIVE_LITTLE : 0)
|
||
| (r_length << RELOC_STD_BITS_LENGTH_SH_LITTLE);
|
||
}
|
||
}
|
||
|
||
|
||
/* Extended stuff */
|
||
/* Output extended relocation information to a file in target byte order. */
|
||
|
||
static void
|
||
NAME(lynx,swap_ext_reloc_out) (bfd *abfd,
|
||
arelent *g,
|
||
struct reloc_ext_external *natptr)
|
||
{
|
||
int r_index;
|
||
int r_extern;
|
||
unsigned int r_type;
|
||
unsigned int r_addend;
|
||
asymbol *sym = *(g->sym_ptr_ptr);
|
||
asection *output_section = sym->section->output_section;
|
||
|
||
PUT_WORD (abfd, g->address, natptr->r_address);
|
||
|
||
r_type = (unsigned int) g->howto->type;
|
||
|
||
r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
|
||
|
||
|
||
/* If this relocation is relative to a symbol then set the
|
||
r_index to the symbols index, and the r_extern bit.
|
||
|
||
Absolute symbols can come in in two ways, either as an offset
|
||
from the abs section, or as a symbol which has an abs value.
|
||
check for that here
|
||
*/
|
||
|
||
if (bfd_is_com_section (output_section)
|
||
|| bfd_is_abs_section (output_section)
|
||
|| bfd_is_und_section (output_section))
|
||
{
|
||
if (bfd_abs_section_ptr->symbol == sym)
|
||
{
|
||
/* Whoops, looked like an abs symbol, but is really an offset
|
||
from the abs section */
|
||
r_index = 0;
|
||
r_extern = 0;
|
||
}
|
||
else
|
||
{
|
||
r_extern = 1;
|
||
r_index = (*g->sym_ptr_ptr)->KEEPIT;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Just an ordinary section */
|
||
r_extern = 0;
|
||
r_index = output_section->target_index;
|
||
}
|
||
|
||
|
||
/* now the fun stuff */
|
||
if (bfd_header_big_endian (abfd))
|
||
{
|
||
natptr->r_index[0] = r_index >> 16;
|
||
natptr->r_index[1] = r_index >> 8;
|
||
natptr->r_index[2] = r_index;
|
||
natptr->r_type[0] =
|
||
(r_extern ? RELOC_EXT_BITS_EXTERN_BIG : 0)
|
||
| (r_type << RELOC_EXT_BITS_TYPE_SH_BIG);
|
||
}
|
||
else
|
||
{
|
||
natptr->r_index[2] = r_index >> 16;
|
||
natptr->r_index[1] = r_index >> 8;
|
||
natptr->r_index[0] = r_index;
|
||
natptr->r_type[0] =
|
||
(r_extern ? RELOC_EXT_BITS_EXTERN_LITTLE : 0)
|
||
| (r_type << RELOC_EXT_BITS_TYPE_SH_LITTLE);
|
||
}
|
||
|
||
PUT_WORD (abfd, r_addend, natptr->r_addend);
|
||
}
|
||
|
||
/* BFD deals internally with all things based from the section they're
|
||
in. so, something in 10 bytes into a text section with a base of
|
||
50 would have a symbol (.text+10) and know .text vma was 50.
|
||
|
||
Aout keeps all it's symbols based from zero, so the symbol would
|
||
contain 60. This macro subs the base of each section from the value
|
||
to give the true offset from the section */
|
||
|
||
|
||
#define MOVE_ADDRESS(ad) \
|
||
if (r_extern) \
|
||
{ \
|
||
/* undefined symbol */ \
|
||
cache_ptr->sym_ptr_ptr = symbols + r_index; \
|
||
cache_ptr->addend = ad; \
|
||
} \
|
||
else \
|
||
{ \
|
||
/* defined, section relative. replace symbol with pointer to \
|
||
symbol which points to section */ \
|
||
switch (r_index) { \
|
||
case N_TEXT: \
|
||
case N_TEXT | N_EXT: \
|
||
cache_ptr->sym_ptr_ptr = obj_textsec(abfd)->symbol_ptr_ptr; \
|
||
cache_ptr->addend = ad - su->textsec->vma; \
|
||
break; \
|
||
case N_DATA: \
|
||
case N_DATA | N_EXT: \
|
||
cache_ptr->sym_ptr_ptr = obj_datasec(abfd)->symbol_ptr_ptr; \
|
||
cache_ptr->addend = ad - su->datasec->vma; \
|
||
break; \
|
||
case N_BSS: \
|
||
case N_BSS | N_EXT: \
|
||
cache_ptr->sym_ptr_ptr = obj_bsssec(abfd)->symbol_ptr_ptr; \
|
||
cache_ptr->addend = ad - su->bsssec->vma; \
|
||
break; \
|
||
default: \
|
||
case N_ABS: \
|
||
case N_ABS | N_EXT: \
|
||
cache_ptr->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; \
|
||
cache_ptr->addend = ad; \
|
||
break; \
|
||
} \
|
||
} \
|
||
|
||
static void
|
||
NAME(lynx,swap_ext_reloc_in) (bfd *abfd,
|
||
struct reloc_ext_external *bytes,
|
||
arelent *cache_ptr,
|
||
asymbol **symbols,
|
||
bfd_size_type symcount ATTRIBUTE_UNUSED)
|
||
{
|
||
int r_index;
|
||
int r_extern;
|
||
unsigned int r_type;
|
||
struct aoutdata *su = &(abfd->tdata.aout_data->a);
|
||
|
||
cache_ptr->address = (GET_SWORD (abfd, bytes->r_address));
|
||
|
||
r_index = bytes->r_index[1];
|
||
r_extern = (0 != (bytes->r_index[0] & RELOC_EXT_BITS_EXTERN_BIG));
|
||
r_type = (bytes->r_index[0] & RELOC_EXT_BITS_TYPE_BIG)
|
||
>> RELOC_EXT_BITS_TYPE_SH_BIG;
|
||
|
||
cache_ptr->howto = aout_32_ext_howto_table + r_type;
|
||
MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
|
||
}
|
||
|
||
static void
|
||
NAME(lynx,swap_std_reloc_in) (bfd *abfd,
|
||
struct reloc_std_external *bytes,
|
||
arelent *cache_ptr,
|
||
asymbol **symbols,
|
||
bfd_size_type symcount ATTRIBUTE_UNUSED)
|
||
{
|
||
int r_index;
|
||
int r_extern;
|
||
unsigned int r_length;
|
||
int r_pcrel;
|
||
struct aoutdata *su = &(abfd->tdata.aout_data->a);
|
||
|
||
cache_ptr->address = H_GET_32 (abfd, bytes->r_address);
|
||
|
||
r_index = bytes->r_index[1];
|
||
r_extern = (0 != (bytes->r_index[0] & RELOC_STD_BITS_EXTERN_BIG));
|
||
r_pcrel = (0 != (bytes->r_index[0] & RELOC_STD_BITS_PCREL_BIG));
|
||
r_length = (bytes->r_index[0] & RELOC_STD_BITS_LENGTH_BIG)
|
||
>> RELOC_STD_BITS_LENGTH_SH_BIG;
|
||
|
||
cache_ptr->howto = aout_32_std_howto_table + r_length + 4 * r_pcrel;
|
||
/* FIXME-soon: Roll baserel, jmptable, relative bits into howto setting */
|
||
|
||
MOVE_ADDRESS (0);
|
||
}
|
||
|
||
/* Reloc hackery */
|
||
|
||
static bfd_boolean
|
||
NAME(lynx,slurp_reloc_table) (bfd *abfd,
|
||
sec_ptr asect,
|
||
asymbol **symbols)
|
||
{
|
||
bfd_size_type count;
|
||
bfd_size_type reloc_size;
|
||
void * relocs;
|
||
arelent *reloc_cache;
|
||
size_t each_size;
|
||
|
||
if (asect->relocation)
|
||
return TRUE;
|
||
|
||
if (asect->flags & SEC_CONSTRUCTOR)
|
||
return TRUE;
|
||
|
||
if (asect == obj_datasec (abfd))
|
||
{
|
||
reloc_size = exec_hdr (abfd)->a_drsize;
|
||
goto doit;
|
||
}
|
||
|
||
if (asect == obj_textsec (abfd))
|
||
{
|
||
reloc_size = exec_hdr (abfd)->a_trsize;
|
||
goto doit;
|
||
}
|
||
|
||
bfd_set_error (bfd_error_invalid_operation);
|
||
return FALSE;
|
||
|
||
doit:
|
||
if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
|
||
return FALSE;
|
||
each_size = obj_reloc_entry_size (abfd);
|
||
|
||
count = reloc_size / each_size;
|
||
|
||
|
||
reloc_cache = (arelent *) bfd_zmalloc (count * sizeof (arelent));
|
||
if (!reloc_cache && count != 0)
|
||
return FALSE;
|
||
|
||
relocs = bfd_alloc (abfd, reloc_size);
|
||
if (!relocs && reloc_size != 0)
|
||
{
|
||
free (reloc_cache);
|
||
return FALSE;
|
||
}
|
||
|
||
if (bfd_bread (relocs, reloc_size, abfd) != reloc_size)
|
||
{
|
||
bfd_release (abfd, relocs);
|
||
free (reloc_cache);
|
||
return FALSE;
|
||
}
|
||
|
||
if (each_size == RELOC_EXT_SIZE)
|
||
{
|
||
struct reloc_ext_external *rptr = (struct reloc_ext_external *) relocs;
|
||
unsigned int counter = 0;
|
||
arelent *cache_ptr = reloc_cache;
|
||
|
||
for (; counter < count; counter++, rptr++, cache_ptr++)
|
||
{
|
||
NAME(lynx,swap_ext_reloc_in) (abfd, rptr, cache_ptr, symbols,
|
||
(bfd_size_type) bfd_get_symcount (abfd));
|
||
}
|
||
}
|
||
else
|
||
{
|
||
struct reloc_std_external *rptr = (struct reloc_std_external *) relocs;
|
||
unsigned int counter = 0;
|
||
arelent *cache_ptr = reloc_cache;
|
||
|
||
for (; counter < count; counter++, rptr++, cache_ptr++)
|
||
{
|
||
NAME(lynx,swap_std_reloc_in) (abfd, rptr, cache_ptr, symbols,
|
||
(bfd_size_type) bfd_get_symcount (abfd));
|
||
}
|
||
|
||
}
|
||
|
||
bfd_release (abfd, relocs);
|
||
asect->relocation = reloc_cache;
|
||
asect->reloc_count = count;
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
|
||
/* Write out a relocation section into an object file. */
|
||
|
||
static bfd_boolean
|
||
NAME(lynx,squirt_out_relocs) (bfd *abfd, asection *section)
|
||
{
|
||
arelent **generic;
|
||
unsigned char *native, *natptr;
|
||
size_t each_size;
|
||
unsigned int count = section->reloc_count;
|
||
bfd_size_type natsize;
|
||
|
||
if (count == 0)
|
||
return TRUE;
|
||
|
||
each_size = obj_reloc_entry_size (abfd);
|
||
natsize = count;
|
||
natsize *= each_size;
|
||
native = (unsigned char *) bfd_zalloc (abfd, natsize);
|
||
if (!native)
|
||
return FALSE;
|
||
|
||
generic = section->orelocation;
|
||
|
||
if (each_size == RELOC_EXT_SIZE)
|
||
{
|
||
for (natptr = native;
|
||
count != 0;
|
||
--count, natptr += each_size, ++generic)
|
||
NAME(lynx,swap_ext_reloc_out) (abfd, *generic, (struct reloc_ext_external *) natptr);
|
||
}
|
||
else
|
||
{
|
||
for (natptr = native;
|
||
count != 0;
|
||
--count, natptr += each_size, ++generic)
|
||
NAME(lynx,swap_std_reloc_out) (abfd, *generic, (struct reloc_std_external *) natptr);
|
||
}
|
||
|
||
if (bfd_bwrite (native, natsize, abfd) != natsize)
|
||
{
|
||
bfd_release (abfd, native);
|
||
return FALSE;
|
||
}
|
||
bfd_release (abfd, native);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
/* This is stupid. This function should be a boolean predicate */
|
||
static long
|
||
NAME(lynx,canonicalize_reloc) (bfd *abfd,
|
||
sec_ptr section,
|
||
arelent **relptr,
|
||
asymbol **symbols)
|
||
{
|
||
arelent *tblptr = section->relocation;
|
||
unsigned int count;
|
||
|
||
if (!(tblptr || NAME(lynx,slurp_reloc_table) (abfd, section, symbols)))
|
||
return -1;
|
||
|
||
if (section->flags & SEC_CONSTRUCTOR)
|
||
{
|
||
arelent_chain *chain = section->constructor_chain;
|
||
for (count = 0; count < section->reloc_count; count++)
|
||
{
|
||
*relptr++ = &chain->relent;
|
||
chain = chain->next;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
tblptr = section->relocation;
|
||
|
||
for (count = 0; count++ < section->reloc_count;)
|
||
{
|
||
*relptr++ = tblptr++;
|
||
}
|
||
}
|
||
*relptr = 0;
|
||
|
||
return section->reloc_count;
|
||
}
|
||
|
||
#define MY_canonicalize_reloc NAME(lynx,canonicalize_reloc)
|
||
|
||
#include "aout-target.h"
|