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binutils-gdb/bfd/aout-cris.c

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/* BFD backend for CRIS a.out binaries.
Copyright (C) 2000 Free Software Foundation, Inc.
Contributed by Axis Communications AB.
Written by Hans-Peter Nilsson.
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. */
/* See info in the file PORTING for documentation of these macros and
functions. Beware; some of the information there is outdated. */
#define N_HEADER_IN_TEXT(x) 0
#define BYTES_IN_WORD 4
#define N_TXTOFF(x) 32
#define ENTRY_CAN_BE_ZERO
#define TEXT_START_ADDR 0
/* If you change this to 4, you can not link to an address N*4+2. */
#define SEGMENT_SIZE 2
/* For some reason, if the a.out file has Z_MAGIC, then
adata(abfd).exec_bytes_size is not used, but rather
adata(abfd).zmagic_disk_block_size, even though the exec_header is
*not* included in the text segment. A simple workaround is to
#define ZMAGIC_DISK_BLOCK_SIZE, which is used if defined; otherwise
TARGET_PAGE_SIZE is used. */
#define ZMAGIC_DISK_BLOCK_SIZE N_TXTOFF (0)
/* It seems odd at first to set a page-size this low, but gives greater
freedom in where things can be linked. The drawback is that you have
to set alignment and padding in linker scripts. */
#define TARGET_PAGE_SIZE SEGMENT_SIZE
#define TARGETNAME "a.out-cris"
/* N_SHARED_LIB gets this reasonable default as of 1999-07-12, but we
have to work with 2.9.1. Note that N_SHARED_LIB is used in a
SUN-specific context, not applicable to CRIS. */
#define N_SHARED_LIB(x) 0
/* The definition here seems not used; just provided as a convention. */
#define DEFAULT_ARCH bfd_arch_cris
/* ??? Spacing might be essential for the parameters in this macro.
Do Not Change. */
#define MY(OP) CAT (cris_aout_,OP)
#define NAME(x,y) CAT3(cris_aout,_32_,y)
#include "bfd.h"
/* Version 1 of the header. */
#define MY_exec_hdr_flags 1
#define MY_write_object_contents MY(write_object_contents)
static boolean MY(write_object_contents) PARAMS ((bfd *));
/* Forward this, so we can use a pointer to it in PARAMS. */
struct reloc_ext_external;
#define MY_swap_ext_reloc_out MY(swap_ext_reloc_out)
static void MY(swap_ext_reloc_out) PARAMS ((bfd *, arelent *,
struct reloc_ext_external *));
#define MY_swap_ext_reloc_in MY(swap_ext_reloc_in)
static void MY(swap_ext_reloc_in) PARAMS ((bfd *, struct
reloc_ext_external *,
arelent *, asymbol **,
bfd_size_type));
#define MY_set_sizes MY(set_sizes)
static boolean MY(set_sizes) PARAMS ((bfd *));
/* To set back reloc_size to ext, we make MY(set_sizes) be called
through this construct. Note that MY_set_arch_mach is only called
through SET_ARCH_MACH. The default bfd_default_set_arch_mach will
not call set_sizes. */
#define MY_set_arch_mach NAME (aout, set_arch_mach)
#define SET_ARCH_MACH(BFD, EXEC) \
MY_set_arch_mach (BFD, DEFAULT_ARCH, N_MACHTYPE (EXEC))
/* These macros describe the binary layout of the reloc information we
use in a file. */
#define RELOC_EXT_BITS_EXTERN_LITTLE 0x80
#define RELOC_EXT_BITS_TYPE_LITTLE 3
#define RELOC_EXT_BITS_TYPE_SH_LITTLE 0
#ifndef MY_get_section_contents
#define MY_get_section_contents aout_32_get_section_contents
#endif
/* Include generic functions (some are overridden above). */
#include "aout32.c"
#include "aout-target.h"
/* We need our own version to set header flags. */
static boolean
MY(write_object_contents) (abfd)
bfd *abfd;
{
struct external_exec exec_bytes;
struct internal_exec *execp = exec_hdr (abfd);
/* We set the reloc type to RELOC_EXT_SIZE, although setting it at all
seems unnecessary when inspecting as and ld behavior (not an
exhaustive inspection). The default write_object_contents
definition sets RELOC_EXT_SIZE, so we follow suite and set it too. */
obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
/* Setting N_SET_MACHTYPE and using N_SET_FLAGS is not performed by
the default definition. */
if (bfd_get_arch(abfd) == bfd_arch_cris)
N_SET_MACHTYPE(*execp, M_CRIS);
N_SET_FLAGS (*execp, aout_backend_info (abfd)->exec_hdr_flags);
WRITE_HEADERS (abfd, execp);
return true;
}
/* We need our own for these reasons:
- Assert that a normal 8, 16 or 32 reloc is output.
- Fix what seems to be a weak-bug (perhaps there for valid reasons). */
static void
MY(swap_ext_reloc_out) (abfd, g, natptr)
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;
if ((sym->flags & BSF_SECTION_SYM) != 0)
r_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_abs_section (bfd_get_section (sym)))
{
r_extern = 0;
r_index = N_ABS;
}
else if ((sym->flags & BSF_SECTION_SYM) == 0)
{
if (bfd_is_und_section (bfd_get_section (sym))
/* Remember to check for weak symbols; they count as global. */
|| (sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0)
r_extern = 1;
else
r_extern = 0;
r_index = (*(g->sym_ptr_ptr))->KEEPIT;
}
else
{
/* Just an ordinary section. */
r_extern = 0;
r_index = output_section->target_index;
}
/* The relocation type is the same as the canonical ones, but only
the first 3 are used: RELOC_8, RELOC_16, RELOC_32.
We may change this later, but assert this for the moment. */
if (r_type > 2)
{
(*_bfd_error_handler) (_("%s: Invalid relocation type exported: %d"),
bfd_get_filename (abfd), r_type);
bfd_set_error (bfd_error_wrong_format);
}
/* Now the fun stuff. */
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);
}
/* We need our own to assert that a normal 8, 16 or 32 reloc is input. */
static void
MY(swap_ext_reloc_in) (abfd, bytes, cache_ptr, symbols, symcount)
bfd *abfd;
struct reloc_ext_external *bytes;
arelent *cache_ptr;
asymbol **symbols;
bfd_size_type symcount;
{
unsigned 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));
/* Now the fun stuff. */
r_index = (bytes->r_index[2] << 16)
| (bytes->r_index[1] << 8)
| bytes->r_index[0];
r_extern = (0 != (bytes->r_type[0] & RELOC_EXT_BITS_EXTERN_LITTLE));
r_type = ((bytes->r_type[0]) >> RELOC_EXT_BITS_TYPE_SH_LITTLE)
& RELOC_EXT_BITS_TYPE_LITTLE;
if (r_type > 2)
{
(*_bfd_error_handler) (_("%s: Invalid relocation type imported: %d"),
bfd_get_filename (abfd), r_type);
bfd_set_error(bfd_error_wrong_format);
}
cache_ptr->howto = howto_table_ext + r_type;
if (r_extern && r_index > symcount)
{
(*_bfd_error_handler)
(_("%s: Bad relocation record imported: %d"),
bfd_get_filename (abfd), r_index);
bfd_set_error (bfd_error_wrong_format);
/* We continue, so we can catch further errors. */
r_extern = 0;
r_index = N_ABS;
}
/* Magically uses r_extern, symbols etc. Ugly, but it's what's in the
default. */
MOVE_ADDRESS (GET_SWORD (abfd, bytes->r_addend));
}
/* We use the same as the default, except that we also set
"obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;", to avoid changing
NAME (aout, set_arch_mach) in aoutx. */
static boolean
MY(set_sizes) (abfd)
bfd *abfd;
{
/* Just as the default in aout-target.h (with some #ifdefs folded)... */
adata(abfd).page_size = TARGET_PAGE_SIZE;
adata(abfd).segment_size = SEGMENT_SIZE;
adata(abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE;
adata(abfd).exec_bytes_size = EXEC_BYTES_SIZE;
/* ... except for that we have the extended reloc. The alternative
would be to add a check on bfd_arch_cris in NAME (aout,
set_arch_mach) in aoutx.h, but I don't want to do that since
target-specific things should not be added there. */
obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
return true;
}
/*
* Local variables:
* eval: (c-set-style "gnu")
* indent-tabs-mode: t
* End:
*/
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