binutils-gdb/bfd/nlm32-ppc.c

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/* Support for 32-bit PowerPC NLM (NetWare Loadable Module)
Copyright (C) 1994 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#define ARCH_SIZE 32
#include "nlm/ppc-ext.h"
#define Nlm_External_Fixed_Header Nlm32_powerpc_External_Fixed_Header
#include "libnlm.h"
static boolean nlm_powerpc_backend_object_p
PARAMS ((bfd *));
static boolean nlm_powerpc_write_prefix
PARAMS ((bfd *));
static boolean nlm_powerpc_read_reloc
PARAMS ((bfd *, nlmNAME(symbol_type) *, asection **, arelent *));
static boolean nlm_powerpc_mangle_relocs
PARAMS ((bfd *, asection *, PTR, bfd_vma, bfd_size_type));
static boolean nlm_powerpc_read_import
PARAMS ((bfd *, nlmNAME(symbol_type) *));
static boolean nlm_powerpc_write_reloc
PARAMS ((bfd *, asection *, arelent *, int));
static boolean nlm_powerpc_write_import
PARAMS ((bfd *, asection *, arelent *));
static boolean nlm_powerpc_write_external
PARAMS ((bfd *, bfd_size_type, asymbol *, struct reloc_and_sec *));
/* PowerPC NLM's have a prefix header before the standard NLM. This
function reads it in, verifies the version, and seeks the bfd to
the location before the regular NLM header. */
static boolean
nlm_powerpc_backend_object_p (abfd)
bfd *abfd;
{
struct nlm32_powerpc_external_prefix_header s;
if (bfd_read ((PTR) &s, sizeof s, 1, abfd) != sizeof s)
return false;
if (memcmp (s.signature, NLM32_POWERPC_SIGNATURE, sizeof s.signature) != 0
|| bfd_h_get_32 (abfd, s.headerVersion) != NLM32_POWERPC_HEADER_VERSION)
return false;
return true;
}
/* Write out the prefix. */
static boolean
nlm_powerpc_write_prefix (abfd)
bfd *abfd;
{
struct nlm32_powerpc_external_prefix_header s;
memset (&s, 0, sizeof s);
memcpy (s.signature, NLM32_POWERPC_SIGNATURE, sizeof s.signature);
bfd_h_put_32 (abfd, (bfd_vma) NLM32_POWERPC_HEADER_VERSION, s.headerVersion);
bfd_h_put_32 (abfd, (bfd_vma) 0, s.origins);
/* FIXME: What should we do about the date? */
if (bfd_write ((PTR) &s, sizeof s, 1, abfd) != sizeof s)
return false;
return true;
}
/* How to process the various reloc types. PowerPC NLMs use XCOFF
reloc types, and I have just copied the XCOFF reloc table here. */
static reloc_howto_type nlm_powerpc_howto_table[] =
{
/* Standard 32 bit relocation. */
HOWTO (0, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_POS", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 32 bit relocation, but store negative value. */
HOWTO (1, /* type */
0, /* rightshift */
-2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_NEG", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 32 bit PC relative relocation. */
HOWTO (2, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"R_REL", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* 16 bit TOC relative relocation. */
HOWTO (3, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"R_TOC", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* I don't really know what this is. */
HOWTO (4, /* type */
1, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RTB", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* External TOC relative symbol. */
HOWTO (5, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_GL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Local TOC relative symbol. */
HOWTO (6, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_TCL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
{ 7 },
/* Non modifiable absolute branch. */
HOWTO (8, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_BA", /* name */
true, /* partial_inplace */
0x3fffffc, /* src_mask */
0x3fffffc, /* dst_mask */
false), /* pcrel_offset */
{ 9 },
/* Non modifiable relative branch. */
HOWTO (0xa, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
true, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"R_BR", /* name */
true, /* partial_inplace */
0x3fffffc, /* src_mask */
0x3fffffc, /* dst_mask */
false), /* pcrel_offset */
{ 0xb },
/* Indirect load. */
HOWTO (0xc, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Load address. */
HOWTO (0xd, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RLA", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
{ 0xe },
/* Non-relocating reference. */
HOWTO (0xf, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_REF", /* name */
false, /* partial_inplace */
0, /* src_mask */
0, /* dst_mask */
false), /* pcrel_offset */
{ 0x10 },
{ 0x11 },
/* TOC relative indirect load. */
HOWTO (0x12, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_TRL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* TOC relative load address. */
HOWTO (0x13, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_TRLA", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable relative branch. */
HOWTO (0x14, /* type */
1, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RRTBI", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable absolute branch. */
HOWTO (0x15, /* type */
1, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RRTBA", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable call absolute indirect. */
HOWTO (0x16, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_CAI", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable call relative. */
HOWTO (0x17, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_REL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable branch absolute. */
HOWTO (0x18, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RBA", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable branch absolute. */
HOWTO (0x19, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_RBAC", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable branch relative. */
HOWTO (0x1a, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
26, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"R_REL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* Modifiable branch absolute. */
HOWTO (0x1b, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"R_REL", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false) /* pcrel_offset */
};
#define HOWTO_COUNT (sizeof nlm_powerpc_howto_table \
/ sizeof nlm_powerpc_howto_table[0])
/* Read a PowerPC NLM reloc. */
static boolean
nlm_powerpc_read_reloc (abfd, sym, secp, rel)
bfd *abfd;
nlmNAME(symbol_type) *sym;
asection **secp;
arelent *rel;
{
struct nlm32_powerpc_external_reloc ext;
bfd_vma l_vaddr;
unsigned long l_symndx;
int l_rtype;
int l_rsecnm;
asection *code_sec, *data_sec, *bss_sec;
/* Read the reloc from the file. */
if (bfd_read (&ext, sizeof ext, 1, abfd) != sizeof ext)
return false;
/* Swap in the fields. */
l_vaddr = bfd_h_get_32 (abfd, ext.l_vaddr);
l_symndx = bfd_h_get_32 (abfd, ext.l_symndx);
l_rtype = bfd_h_get_16 (abfd, ext.l_rtype);
l_rsecnm = bfd_h_get_16 (abfd, ext.l_rsecnm);
/* Get the sections now, for convenience. */
code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
bss_sec = bfd_get_section_by_name (abfd, NLM_UNINITIALIZED_DATA_NAME);
/* Work out the arelent fields. */
if (sym != NULL)
{
/* This is an import. sym_ptr_ptr is filled in by
nlm_canonicalize_reloc. */
rel->sym_ptr_ptr = NULL;
}
else
{
asection *sec;
if (l_symndx == 0)
sec = code_sec;
else if (l_symndx == 1)
sec = data_sec;
else if (l_symndx == 2)
sec = bss_sec;
else
{
bfd_set_error (bfd_error_bad_value);
return false;
}
rel->sym_ptr_ptr = sec->symbol_ptr_ptr;
}
rel->addend = 0;
BFD_ASSERT ((l_rtype & 0xff) < HOWTO_COUNT);
rel->howto = nlm_powerpc_howto_table + (l_rtype & 0xff);
BFD_ASSERT (rel->howto->name != NULL
&& ((l_rtype & 0x8000) != 0
? (rel->howto->complain_on_overflow
== complain_overflow_signed)
: (rel->howto->complain_on_overflow
== complain_overflow_bitfield))
&& ((l_rtype >> 8) & 0x1f) == rel->howto->bitsize - 1);
if (l_rsecnm == 0)
*secp = code_sec;
else if (l_rsecnm == 1)
{
*secp = data_sec;
l_vaddr -= bfd_section_size (abfd, code_sec);
}
else
{
bfd_set_error (bfd_error_bad_value);
return false;
}
rel->address = l_vaddr;
return true;
}
/* Mangle PowerPC NLM relocs for output. */
static boolean
nlm_powerpc_mangle_relocs (abfd, sec, data, offset, count)
bfd *abfd;
asection *sec;
PTR data;
bfd_vma offset;
bfd_size_type count;
{
return true;
}
/* Read a PowerPC NLM import record */
static boolean
nlm_powerpc_read_import (abfd, sym)
bfd *abfd;
nlmNAME(symbol_type) *sym;
{
struct nlm_relent *nlm_relocs; /* relocation records for symbol */
bfd_size_type rcount; /* number of relocs */
bfd_byte temp[NLM_TARGET_LONG_SIZE]; /* temporary 32-bit value */
unsigned char symlength; /* length of symbol name */
char *name;
if (bfd_read ((PTR) &symlength, sizeof (symlength), 1, abfd)
!= sizeof (symlength))
return (false);
sym -> symbol.the_bfd = abfd;
name = bfd_alloc (abfd, symlength + 1);
if (name == NULL)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
if (bfd_read (name, symlength, 1, abfd) != symlength)
return (false);
name[symlength] = '\0';
sym -> symbol.name = name;
sym -> symbol.flags = 0;
sym -> symbol.value = 0;
sym -> symbol.section = &bfd_und_section;
if (bfd_read ((PTR) temp, sizeof (temp), 1, abfd) != sizeof (temp))
return (false);
rcount = bfd_h_get_32 (abfd, temp);
nlm_relocs = ((struct nlm_relent *)
bfd_alloc (abfd, rcount * sizeof (struct nlm_relent)));
if (nlm_relocs == (struct nlm_relent *) NULL)
{
bfd_set_error (bfd_error_no_memory);
return false;
}
sym -> relocs = nlm_relocs;
sym -> rcnt = 0;
while (sym -> rcnt < rcount)
{
asection *section;
if (nlm_powerpc_read_reloc (abfd, sym, &section,
&nlm_relocs -> reloc)
== false)
return false;
nlm_relocs -> section = section;
nlm_relocs++;
sym -> rcnt++;
}
return true;
}
/* Write a PowerPC NLM reloc. */
static boolean
nlm_powerpc_write_reloc (abfd, sec, rel, indx)
bfd *abfd;
asection *sec;
arelent *rel;
int indx;
{
struct nlm32_powerpc_external_reloc ext;
asection *code_sec, *data_sec, *bss_sec;
asymbol *sym;
asection *symsec;
unsigned long l_symndx;
int l_rtype;
int l_rsecnm;
const reloc_howto_type *howto;
bfd_size_type address;
/* Get the sections now, for convenience. */
code_sec = bfd_get_section_by_name (abfd, NLM_CODE_NAME);
data_sec = bfd_get_section_by_name (abfd, NLM_INITIALIZED_DATA_NAME);
bss_sec = bfd_get_section_by_name (abfd, NLM_UNINITIALIZED_DATA_NAME);
sym = *rel->sym_ptr_ptr;
symsec = bfd_get_section (sym);
if (indx != -1)
{
BFD_ASSERT (symsec == &bfd_und_section);
l_symndx = indx + 3;
}
else
{
if (symsec == code_sec)
l_symndx = 0;
else if (symsec == data_sec)
l_symndx = 1;
else if (symsec == bss_sec)
l_symndx = 2;
else
{
bfd_set_error (bfd_error_bad_value);
return false;
}
}
bfd_h_put_32 (abfd, (bfd_vma) l_symndx, ext.l_symndx);
for (howto = nlm_powerpc_howto_table;
howto < nlm_powerpc_howto_table + HOWTO_COUNT;
howto++)
{
if (howto->rightshift == rel->howto->rightshift
&& howto->size == rel->howto->size
&& howto->bitsize == rel->howto->bitsize
&& howto->pc_relative == rel->howto->pc_relative
&& howto->bitpos == rel->howto->bitpos
&& (howto->partial_inplace == rel->howto->partial_inplace
|| (! rel->howto->partial_inplace
&& rel->addend == 0))
&& (howto->src_mask == rel->howto->src_mask
|| (rel->howto->src_mask == 0
&& rel->addend == 0))
&& howto->dst_mask == rel->howto->dst_mask
&& howto->pcrel_offset == rel->howto->pcrel_offset)
break;
}
if (howto >= nlm_powerpc_howto_table + HOWTO_COUNT)
{
bfd_set_error (bfd_error_bad_value);
return false;
}
l_rtype = howto->type;
if (howto->complain_on_overflow == complain_overflow_signed)
l_rtype |= 0x8000;
l_rtype |= (howto->bitsize - 1) << 8;
bfd_h_put_16 (abfd, (bfd_vma) l_rtype, ext.l_rtype);
address = rel->address;
if (sec == code_sec)
l_rsecnm = 0;
else if (sec == data_sec)
{
l_rsecnm = 1;
address += bfd_section_size (abfd, code_sec);
}
else
{
bfd_set_error (bfd_error_bad_value);
return false;
}
bfd_h_put_16 (abfd, (bfd_vma) l_rsecnm, ext.l_rsecnm);
bfd_h_put_32 (abfd, (bfd_vma) address, ext.l_vaddr);
if (bfd_write (&ext, sizeof ext, 1, abfd) != sizeof ext)
return false;
return true;
}
/* Write a PowerPC NLM import. */
static boolean
nlm_powerpc_write_import (abfd, sec, rel)
bfd *abfd;
asection *sec;
arelent *rel;
{
return nlm_powerpc_write_reloc (abfd, sec, rel, -1);
}
/* Write a PowerPC NLM external symbol. This routine keeps a static
count of the symbol index. FIXME: I don't know if this is
necessary, and the index never gets reset. */
static boolean
nlm_powerpc_write_external (abfd, count, sym, relocs)
bfd *abfd;
bfd_size_type count;
asymbol *sym;
struct reloc_and_sec *relocs;
{
int i;
bfd_byte len;
unsigned char temp[NLM_TARGET_LONG_SIZE];
static int indx;
len = strlen (sym->name);
if ((bfd_write (&len, sizeof (bfd_byte), 1, abfd) != sizeof(bfd_byte))
|| bfd_write (sym->name, len, 1, abfd) != len)
return false;
bfd_put_32 (abfd, count, temp);
if (bfd_write (temp, sizeof(temp), 1, abfd) != sizeof (temp))
return false;
for (i = 0; i < count; i++)
{
if (nlm_powerpc_write_reloc (abfd, relocs[i].sec,
relocs[i].rel, indx) == false)
return false;
}
++indx;
return true;
}
#include "nlmswap.h"
static const struct nlm_backend_data nlm32_powerpc_backend =
{
"NetWare PowerPC Module \032",
sizeof (Nlm32_powerpc_External_Fixed_Header),
sizeof (struct nlm32_powerpc_external_prefix_header),
bfd_arch_powerpc,
0,
false,
nlm_powerpc_backend_object_p,
nlm_powerpc_write_prefix,
nlm_powerpc_read_reloc,
nlm_powerpc_mangle_relocs,
nlm_powerpc_read_import,
nlm_powerpc_write_import,
0, /* set_public_section */
0, /* get_public_offset */
nlm_swap_fixed_header_in,
nlm_swap_fixed_header_out,
nlm_powerpc_write_external,
0, /* write_export */
};
#define TARGET_BIG_NAME "nlm32-powerpc"
#define TARGET_BIG_SYM nlmNAME(powerpc_vec)
#define TARGET_BACKEND_DATA &nlm32_powerpc_backend
#include "nlm-target.h"