binutils-gdb/bfd/mipsbsd.c

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/* BFD backend for MIPS BSD (a.out) binaries.
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Copyright 1993, 1994, 1995, 1997, 1998, 1999, 2000
Free Software Foundation, Inc.
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Written by Ralph Campbell.
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. */
#define BYTES_IN_WORD 4
/* #define ENTRY_CAN_BE_ZERO */
#define N_HEADER_IN_TEXT(x) 1
#define N_SHARED_LIB(x) 0
#define N_TXTADDR(x) \
(N_MAGIC(x) != ZMAGIC ? (x).a_entry : /* object file or NMAGIC */\
TEXT_START_ADDR + EXEC_BYTES_SIZE /* no padding */\
)
#define N_DATADDR(x) (N_TXTADDR(x)+N_TXTSIZE(x))
#define TEXT_START_ADDR 4096
#define TARGET_PAGE_SIZE 4096
#define SEGMENT_SIZE TARGET_PAGE_SIZE
#define DEFAULT_ARCH bfd_arch_mips
#define MACHTYPE_OK(mtype) ((mtype) == M_UNKNOWN \
|| (mtype) == M_MIPS1 || (mtype) == M_MIPS2)
#define MY_symbol_leading_char '\0'
#define MY(OP) CAT(mipsbsd_,OP)
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "libaout.h"
#define SET_ARCH_MACH(ABFD, EXEC) \
MY(set_arch_mach) (ABFD, N_MACHTYPE (EXEC)); \
MY(choose_reloc_size) (ABFD);
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static void MY(set_arch_mach) PARAMS ((bfd *abfd, int machtype));
static void MY(choose_reloc_size) PARAMS ((bfd *abfd));
#define MY_write_object_contents MY(write_object_contents)
static boolean MY(write_object_contents) PARAMS ((bfd *abfd));
/* We can't use MY(x) here because it leads to a recursive call to CAT
when expanded inside JUMP_TABLE. */
#define MY_bfd_reloc_type_lookup mipsbsd_reloc_howto_type_lookup
#define MY_canonicalize_reloc mipsbsd_canonicalize_reloc
#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define MY_final_link_callback unused
#define MY_bfd_final_link _bfd_generic_final_link
#define MY_backend_data &MY(backend_data)
#define MY_BFD_TARGET
#include "aout-target.h"
static void
MY(set_arch_mach) (abfd, machtype)
bfd *abfd;
int machtype;
{
enum bfd_architecture arch;
long machine;
/* Determine the architecture and machine type of the object file. */
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switch (machtype) {
case M_MIPS1:
arch = bfd_arch_mips;
machine = 3000;
break;
case M_MIPS2:
arch = bfd_arch_mips;
machine = 4000;
break;
default:
arch = bfd_arch_obscure;
machine = 0;
break;
}
bfd_set_arch_mach(abfd, arch, machine);
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}
/* Determine the size of a relocation entry, based on the architecture */
static void
MY(choose_reloc_size) (abfd)
bfd *abfd;
{
switch (bfd_get_arch(abfd)) {
case bfd_arch_sparc:
case bfd_arch_a29k:
case bfd_arch_mips:
obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
break;
default:
obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
break;
}
}
/* Write an object file in BSD a.out format.
Section contents have already been written. We write the
file header, symbols, and relocation. */
static boolean
MY(write_object_contents) (abfd)
bfd *abfd;
{
struct external_exec exec_bytes;
struct internal_exec *execp = exec_hdr (abfd);
/* Magic number, maestro, please! */
switch (bfd_get_arch(abfd)) {
case bfd_arch_m68k:
switch (bfd_get_mach(abfd)) {
case bfd_mach_m68010:
N_SET_MACHTYPE(*execp, M_68010);
break;
default:
case bfd_mach_m68020:
N_SET_MACHTYPE(*execp, M_68020);
break;
}
break;
case bfd_arch_sparc:
N_SET_MACHTYPE(*execp, M_SPARC);
break;
case bfd_arch_i386:
N_SET_MACHTYPE(*execp, M_386);
break;
case bfd_arch_a29k:
N_SET_MACHTYPE(*execp, M_29K);
break;
case bfd_arch_mips:
switch (bfd_get_mach(abfd)) {
case 4000:
case 6000:
N_SET_MACHTYPE(*execp, M_MIPS2);
break;
default:
N_SET_MACHTYPE(*execp, M_MIPS1);
break;
}
break;
default:
N_SET_MACHTYPE(*execp, M_UNKNOWN);
}
MY(choose_reloc_size) (abfd);
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WRITE_HEADERS(abfd, execp);
return true;
}
/*
* MIPS relocation types.
*/
#define MIPS_RELOC_32 0
#define MIPS_RELOC_JMP 1
#define MIPS_RELOC_WDISP16 2
#define MIPS_RELOC_HI16 3
#define MIPS_RELOC_HI16_S 4
#define MIPS_RELOC_LO16 5
/*
* This is only called when performing a BFD_RELOC_MIPS_JMP relocation.
* The jump destination address is formed from the upper 4 bits of the
* "current" program counter concatenated with the jump instruction's
* 26 bit field and two trailing zeros.
* If the destination address is not in the same segment as the "current"
* program counter, then we need to signal an error.
*/
static bfd_reloc_status_type
mips_fix_jmp_addr (abfd,reloc_entry,symbol,data,input_section,output_bfd)
bfd *abfd ATTRIBUTE_UNUSED;
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arelent *reloc_entry;
struct symbol_cache_entry *symbol;
PTR data ATTRIBUTE_UNUSED;
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asection *input_section;
bfd *output_bfd;
{
bfd_vma relocation, pc;
/* If this is a partial relocation, just continue. */
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if (output_bfd != (bfd *)NULL)
return bfd_reloc_continue;
/* If this is an undefined symbol, return error */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0)
return bfd_reloc_undefined;
/*
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* Work out which section the relocation is targetted at and the
* initial relocation command value.
*/
if (bfd_is_com_section (symbol->section))
relocation = 0;
else
relocation = symbol->value;
relocation += symbol->section->output_section->vma;
relocation += symbol->section->output_offset;
relocation += reloc_entry->addend;
pc = input_section->output_section->vma + input_section->output_offset +
reloc_entry->address + 4;
if ((relocation & 0xF0000000) != (pc & 0xF0000000))
return bfd_reloc_overflow;
return bfd_reloc_continue;
}
/*
* This is only called when performing a BFD_RELOC_HI16_S relocation.
* We need to see if bit 15 is set in the result. If it is, we add
* 0x10000 and continue normally. This will compensate for the sign extension
* when the low bits are added at run time.
*/
static bfd_reloc_status_type
mips_fix_hi16_s PARAMS ((bfd *, arelent *, asymbol *, PTR,
asection *, bfd *, char **));
static bfd_reloc_status_type
mips_fix_hi16_s (abfd, reloc_entry, symbol, data, input_section,
output_bfd, error_message)
bfd *abfd ATTRIBUTE_UNUSED;
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arelent *reloc_entry;
asymbol *symbol;
PTR data ATTRIBUTE_UNUSED;
asection *input_section ATTRIBUTE_UNUSED;
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bfd *output_bfd;
char **error_message ATTRIBUTE_UNUSED;
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{
bfd_vma relocation;
/* If this is a partial relocation, just continue. */
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if (output_bfd != (bfd *)NULL)
return bfd_reloc_continue;
/* If this is an undefined symbol, return error */
if (bfd_is_und_section (symbol->section)
&& (symbol->flags & BSF_WEAK) == 0)
return bfd_reloc_undefined;
/*
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* Work out which section the relocation is targetted at and the
* initial relocation command value.
*/
if (bfd_is_com_section (symbol->section))
relocation = 0;
else
relocation = symbol->value;
relocation += symbol->section->output_section->vma;
relocation += symbol->section->output_offset;
relocation += reloc_entry->addend;
if (relocation & 0x8000)
reloc_entry->addend += 0x10000;
return bfd_reloc_continue;
}
static reloc_howto_type mips_howto_table_ext[] = {
{MIPS_RELOC_32, 0, 2, 32, false, 0, complain_overflow_bitfield, 0,
"32", false, 0, 0xffffffff, false},
{MIPS_RELOC_JMP, 2, 2, 26, false, 0, complain_overflow_dont,
mips_fix_jmp_addr,
"MIPS_JMP", false, 0, 0x03ffffff, false},
{MIPS_RELOC_WDISP16, 2, 2, 16, true, 0, complain_overflow_signed, 0,
"WDISP16", false, 0, 0x0000ffff, false},
{MIPS_RELOC_HI16, 16, 2, 16, false, 0, complain_overflow_bitfield, 0,
"HI16", false, 0, 0x0000ffff, false},
{MIPS_RELOC_HI16_S, 16, 2, 16, false, 0, complain_overflow_bitfield,
mips_fix_hi16_s,
"HI16_S", false, 0, 0x0000ffff, false},
{MIPS_RELOC_LO16, 0, 2, 16, false, 0, complain_overflow_dont, 0,
"LO16", false, 0, 0x0000ffff, false},
};
static reloc_howto_type *
MY(reloc_howto_type_lookup) (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
if (bfd_get_arch (abfd) != bfd_arch_mips)
return 0;
switch (code)
{
case BFD_RELOC_CTOR:
case BFD_RELOC_32:
return (&mips_howto_table_ext[MIPS_RELOC_32]);
case BFD_RELOC_MIPS_JMP:
return (&mips_howto_table_ext[MIPS_RELOC_JMP]);
case BFD_RELOC_16_PCREL_S2:
return (&mips_howto_table_ext[MIPS_RELOC_WDISP16]);
case BFD_RELOC_HI16:
return (&mips_howto_table_ext[MIPS_RELOC_HI16]);
case BFD_RELOC_HI16_S:
return (&mips_howto_table_ext[MIPS_RELOC_HI16_S]);
case BFD_RELOC_LO16:
return (&mips_howto_table_ext[MIPS_RELOC_LO16]);
default:
return 0;
}
}
/*
* This is just like the standard aoutx.h version but we need to do our
* own mapping of external reloc type values to howto entries.
*/
long
MY(canonicalize_reloc) (abfd, section, relptr, symbols)
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bfd *abfd;
sec_ptr section;
arelent **relptr;
asymbol **symbols;
{
arelent *tblptr = section->relocation;
unsigned int count, c;
extern reloc_howto_type NAME(aout,ext_howto_table)[];
/* If we have already read in the relocation table, return the values. */
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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;
}
*relptr = 0;
return section->reloc_count;
}
if (tblptr && section->reloc_count) {
for (count = 0; count++ < section->reloc_count;)
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*relptr++ = tblptr++;
*relptr = 0;
return section->reloc_count;
}
if (!NAME(aout,slurp_reloc_table) (abfd, section, symbols))
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return -1;
tblptr = section->relocation;
/* fix up howto entries */
for (count = 0; count++ < section->reloc_count;)
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{
c = tblptr->howto - NAME(aout,ext_howto_table);
tblptr->howto = &mips_howto_table_ext[c];
*relptr++ = tblptr++;
}
*relptr = 0;
return section->reloc_count;
}
static CONST struct aout_backend_data MY(backend_data) = {
0, /* zmagic contiguous */
1, /* text incl header */
0, /* entry is text address */
0, /* exec_hdr_flags */
TARGET_PAGE_SIZE, /* text vma */
MY_set_sizes,
0, /* text size includes exec header */
0, /* add_dynamic_symbols */
0, /* add_one_symbol */
0, /* link_dynamic_object */
0, /* write_dynamic_symbol */
0, /* check_dynamic_reloc */
0 /* finish_dynamic_link */
};
extern const bfd_target aout_mips_big_vec;
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const bfd_target aout_mips_little_vec =
{
"a.out-mips-little", /* name */
bfd_target_aout_flavour,
BFD_ENDIAN_LITTLE, /* target byte order (little) */
BFD_ENDIAN_LITTLE, /* target headers byte order (little) */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
MY_symbol_leading_char,
' ', /* ar_pad_char */
15, /* ar_max_namelen */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
bfd_generic_archive_p, MY_core_file_p},
{bfd_false, MY_mkobject, /* bfd_set_format */
_bfd_generic_mkarchive, bfd_false},
{bfd_false, MY_write_object_contents, /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
BFD_JUMP_TABLE_GENERIC (MY),
BFD_JUMP_TABLE_COPY (MY),
BFD_JUMP_TABLE_CORE (MY),
BFD_JUMP_TABLE_ARCHIVE (MY),
BFD_JUMP_TABLE_SYMBOLS (MY),
BFD_JUMP_TABLE_RELOCS (MY),
BFD_JUMP_TABLE_WRITE (MY),
BFD_JUMP_TABLE_LINK (MY),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
& aout_mips_big_vec,
(PTR) MY_backend_data
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};
const bfd_target aout_mips_big_vec =
{
"a.out-mips-big", /* name */
bfd_target_aout_flavour,
BFD_ENDIAN_BIG, /* target byte order (big) */
BFD_ENDIAN_BIG, /* target headers byte order (big) */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
MY_symbol_leading_char,
' ', /* ar_pad_char */
15, /* ar_max_namelen */
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* data */
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
bfd_getb16, bfd_getb_signed_16, bfd_putb16, /* hdrs */
{_bfd_dummy_target, MY_object_p, /* bfd_check_format */
bfd_generic_archive_p, MY_core_file_p},
{bfd_false, MY_mkobject, /* bfd_set_format */
_bfd_generic_mkarchive, bfd_false},
{bfd_false, MY_write_object_contents, /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
BFD_JUMP_TABLE_GENERIC (MY),
BFD_JUMP_TABLE_COPY (MY),
BFD_JUMP_TABLE_CORE (MY),
BFD_JUMP_TABLE_ARCHIVE (MY),
BFD_JUMP_TABLE_SYMBOLS (MY),
BFD_JUMP_TABLE_RELOCS (MY),
BFD_JUMP_TABLE_WRITE (MY),
BFD_JUMP_TABLE_LINK (MY),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
& aout_mips_little_vec,
(PTR) MY_backend_data
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};