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darling-gdb/bfd/coff-ppc.c
Kim Knuttila e7aa05bfcf First round BFD for PE/PowerPC
1995-09-27 11:34:10 +00:00

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/* BFD back-end for PowerPC Microsoft Portable Executable files.
Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
Original version pieced together by Kim Knuttila (krk@cygnus.com)
There is nothing new under the sun. This file draws a lot on other
coff files, in particular, those for the rs/6000, alpha, mips, and
intel backends, and the PE work for the arm.
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. */
/* Current State:
- objdump works
- relocs generated by gas
*/
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "obstack.h"
#include "coff/powerpc.h"
#include "coff/internal.h"
#include "coff/pe.h"
#ifdef BADMAG
#undef BADMAG
#endif
#define BADMAG(x) PPCBADMAG(x)
#include "libcoff.h"
/* The main body of code is in coffcode.h. */
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (3)
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
from smaller values. Start with zero, widen, *then* decrement. */
#define MINUS_ONE (((bfd_vma)0) - 1)
/* these should definitely go in a header file somewhere... */
/* NOP */
#define IMAGE_REL_PPC_ABSOLUTE 0x0000
/* 64-bit address */
#define IMAGE_REL_PPC_ADDR64 0x0001
/* 32-bit address */
#define IMAGE_REL_PPC_ADDR32 0x0002
/* 26-bit address, shifted left 2 (branch absolute) */
#define IMAGE_REL_PPC_ADDR24 0x0003
/* 16-bit address */
#define IMAGE_REL_PPC_ADDR16 0x0004
/* 16-bit address, shifted left 2 (load doubleword) */
#define IMAGE_REL_PPC_ADDR14 0x0005
/* 26-bit PC-relative offset, shifted left 2 (branch relative) */
#define IMAGE_REL_PPC_REL24 0x0006
/* 16-bit PC-relative offset, shifted left 2 (br cond relative) */
#define IMAGE_REL_PPC_REL14 0x0007
/* 16-bit offset from TOC base */
#define IMAGE_REL_PPC_TOCREL16 0x0008
/* 16-bit offset from TOC base, shifted left 2 (load doubleword) */
#define IMAGE_REL_PPC_TOCREL14 0x0009
/* 32-bit addr w/o image base */
#define IMAGE_REL_PPC_ADDR32NB 0x000A
/* va of containing section (as in an image sectionhdr) */
#define IMAGE_REL_PPC_SECREL 0x000B
/* sectionheader number */
#define IMAGE_REL_PPC_SECTION 0x000C
/* substitute TOC restore instruction iff symbol is glue code */
#define IMAGE_REL_PPC_IFGLUE 0x000D
/* symbol is glue code; virtual address is TOC restore instruction */
#define IMAGE_REL_PPC_IMGLUE 0x000E
/* va of containing section (limited to 16 bits) */
#define IMAGE_REL_PPC_SECREL16 0x000F
/* stuff to handle immediate data when the number of bits in the */
/* data is greater than the number of bits in the immediate field */
/* We need to do (usually) 32 bit arithmetic on 16 bit chunks */
#define IMAGE_REL_PPC_REFHI 0x0010
#define IMAGE_REL_PPC_REFLO 0x0011
#define IMAGE_REL_PPC_PAIR 0x0012
/* Flag bits in IMAGE_RELOCATION.TYPE */
/* subtract reloc value rather than adding it */
#define IMAGE_REL_PPC_NEG 0x0100
/* fix branch prediction bit to predict branch taken */
#define IMAGE_REL_PPC_BRTAKEN 0x0200
/* fix branch prediction bit to predict branch not taken */
#define IMAGE_REL_PPC_BRNTAKEN 0x0400
/* toc slot defined in file (or, data in toc) */
#define IMAGE_REL_PPC_TOCDEFN 0x0800
/* masks to isolate above values in IMAGE_RELOCATION.Type */
#define IMAGE_REL_PPC_TYPEMASK 0x00FF
#define IMAGE_REL_PPC_FLAGMASK 0x0F00
#define EXTRACT_TYPE(x) ((x) & IMAGE_REL_PPC_TYPEMASK)
#define EXTRACT_FLAGS(x) ((x) & IMAGE_REL_PPC_FLAGMASK)
#define EXTRACT_JUNK(x) \
((x) & ~(IMAGE_REL_PPC_TYPEMASK | IMAGE_REL_PPC_FLAGMASK))
/* static helper functions to make relocation work */
/* (Work In Progress) */
static bfd_reloc_status_type ppc_refhi_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_reflo_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_pair_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_toc16_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_addr32nb_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_section_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_secrel_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
static bfd_reloc_status_type ppc_imglue_reloc PARAMS ((bfd *abfd,
arelent *reloc,
asymbol *symbol,
PTR data,
asection *section,
bfd *output_bfd,
char **error));
/* FIXME: It'll take a while to get through all of these. I only need a few to
get us started, so those I'll make sure work. Those marked FIXME are either
completely unverified or have a specific unknown marked in the comment */
/*---------------------------------------------------------------------------*/
/* */
/* Relocation entries for Windows/NT on PowerPC. */
/* */
/* From the document "" we find the following listed as used relocs: */
/* */
/* ABSOLUTE : The noop */
/* ADDR[64|32|16] : fields that hold addresses in data fields or the */
/* 16 bit displacement field on a load/store. */
/* ADDR[24|14] : fields that hold addresses in branch and cond */
/* branches. These represent [26|16] bit addresses. */
/* The low order 2 bits are preserved. */
/* REL[24|14] : branches relative to the Instruction Address */
/* register. These represent [26|16] bit addresses, */
/* as before. The instruction field will be zero, and */
/* the address of the SYM will be inserted at link time. */
/* TOCREL16 : 16 bit displacement field referring to a slot in */
/* toc. */
/* TOCREL14 : 16 bit displacement field, similar to REL14 or ADDR14. */
/* ADDR32NB : 32 bit address relative to the virtual origin. */
/* (On the alpha, this is always a linker generated thunk)*/
/* (i.e. 32bit addr relative to the image base) */
/* SECREL : The value is relative to the start of the section */
/* containing the symbol. */
/* SECTION : access to the header containing the item. Supports the */
/* codeview debugger. */
/* */
/* In particular, note that the document does not indicate that the */
/* relocations listed in the header file are used. */
/* */
/* */
/* */
/*---------------------------------------------------------------------------*/
static reloc_howto_type ppc_coff_howto_table[] =
{
/* IMAGE_REL_PPC_ABSOLUTE 0x0000 NOP */
/* Unused: */
HOWTO (IMAGE_REL_PPC_ABSOLUTE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
0, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* dont complain_on_overflow */
0, /* special_function */
"ABSOLUTE", /* name */
false, /* partial_inplace */
0x00, /* src_mask */
0x00, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR64 0x0001 64-bit address */
/* Unused: */
HOWTO(IMAGE_REL_PPC_ADDR64, /* type */
0, /* rightshift */
3, /* size (0 = byte, 1 = short, 2 = long) */
64, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_bitfield, /* complain_on_overflow */
0, /* special_function */
"ADDR64", /* name */
true, /* partial_inplace */
MINUS_ONE, /* src_mask */
MINUS_ONE, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR32 0x0002 32-bit address */
/* Used: */
HOWTO (IMAGE_REL_PPC_ADDR32, /* 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 */
"ADDR32", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR24 0x0003 26-bit address, shifted left 2 (branch absolute) */
/* the LI field is in bit 6 through bit 29 is 24 bits, + 2 for the shift */
/* Of course, That's the IBM approved bit numbering, which is not what
/* anyone else uses.... The li field is in bit 2 thru 25 */
/* Used: */
HOWTO (IMAGE_REL_PPC_ADDR24, /* 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 */
"ADDR24", /* name */
true, /* partial_inplace */
0x07fffffc, /* src_mask */
0x07fffffc, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR16 0x0004 16-bit address */
/* Used: */
HOWTO (IMAGE_REL_PPC_ADDR16, /* 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 */
"ADDR16", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR14 0x0005 */
/* 16-bit address, shifted left 2 (load doubleword) */
/* FIXME: the mask is likely wrong, and the bit position may be as well */
/* Unused: */
HOWTO (IMAGE_REL_PPC_ADDR14, /* type */
1, /* 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 */
"ADDR16", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_REL24 0x0006 */
/* 26-bit PC-relative offset, shifted left 2 (branch relative) */
/* Used: */
HOWTO (IMAGE_REL_PPC_REL24, /* 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 */
"REL24", /* name */
true, /* partial_inplace */
0x3fffffc, /* src_mask */
0x3fffffc, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_REL14 0x0007 */
/* 16-bit PC-relative offset, shifted left 2 (br cond relative) */
/* FIXME: the mask is likely wrong, and the bit position may be as well */
/* FIXME: how does it know how far to shift? */
/* Unused: */
HOWTO (IMAGE_REL_PPC_ADDR14, /* type */
1, /* 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 */
"ADDR16", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_TOCREL16 0x0008 */
/* 16-bit offset from TOC base */
/* Used: */
HOWTO (IMAGE_REL_PPC_TOCREL16,/* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
ppc_toc16_reloc, /* special_function */
"TOCREL16", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_TOCREL14 0x0009 */
/* 16-bit offset from TOC base, shifted left 2 (load doubleword) */
/* Unused: */
HOWTO (IMAGE_REL_PPC_TOCREL14,/* type */
1, /* 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 */
"TOCREL14", /* name */
false, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_ADDR32NB 0x000A */
/* 32-bit addr w/ image base */
/* Unused: */
HOWTO (IMAGE_REL_PPC_ADDR32NB,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_addr32nb_reloc, /* special_function */
"ADDR32NB", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_SECREL 0x000B */
/* va of containing section (as in an image sectionhdr) */
/* Unused: */
HOWTO (IMAGE_REL_PPC_SECREL,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_secrel_reloc, /* special_function */
"SECREL", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_SECTION 0x000C */
/* sectionheader number */
/* Unused: */
HOWTO (IMAGE_REL_PPC_SECTION,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_section_reloc, /* special_function */
"SECTION", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_IFGLUE 0x000D */
/* substitute TOC restore instruction iff symbol is glue code */
/* Used: */
HOWTO (IMAGE_REL_PPC_IFGLUE,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
0, /* special_function */
"IFGLUE", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_IMGLUE 0x000E */
/* symbol is glue code; virtual address is TOC restore instruction */
/* Unused: */
HOWTO (IMAGE_REL_PPC_IMGLUE,/* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
32, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
ppc_imglue_reloc, /* special_function */
"IMGLUE", /* name */
false, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_SECREL16 0x000F */
/* va of containing section (limited to 16 bits) */
/* Unused: */
HOWTO (IMAGE_REL_PPC_SECREL16,/* 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 */
"SECREL16", /* name */
true, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
true), /* pcrel_offset */
/* IMAGE_REL_PPC_REFHI 0x0010 */
/* Unused: */
HOWTO (IMAGE_REL_PPC_REFHI, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_refhi_reloc, /* special_function */
"REFHI", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_REFLO 0x0011 */
/* Unused: */
HOWTO (IMAGE_REL_PPC_REFLO, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_refhi_reloc, /* special_function */
"REFLO", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false), /* pcrel_offset */
/* IMAGE_REL_PPC_PAIR 0x0012 */
/* Unused: */
HOWTO (IMAGE_REL_PPC_PAIR, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
16, /* bitsize */
false, /* pc_relative */
0, /* bitpos */
complain_overflow_signed, /* complain_on_overflow */
ppc_pair_reloc, /* special_function */
"PAIR", /* name */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
false) /* pcrel_offset */
};
/* Provided the symbol, returns the value reffed */
static long get_symbol_value PARAMS ((asymbol *));
static long
get_symbol_value (symbol)
asymbol *symbol;
{
long relocation = 0;
if (bfd_is_com_section (symbol->section))
{
relocation = 0;
}
else
{
relocation = symbol->value +
symbol->section->output_section->vma +
symbol->section->output_offset;
}
return(relocation);
}
/* this function is in charge of performing all the ppc PE relocations */
/* Don't yet know if we want to do this this particular way ... (krk) */
/* (it is not yet enabled) */
static bfd_reloc_status_type
pe_ppc_reloc (abfd, reloc_entry, symbol_in, data, input_section, output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol_in;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
/* the consth relocation comes in two parts, we have to remember
the state between calls, in these variables */
static boolean part1_consth_active = false;
static unsigned long part1_consth_value;
unsigned long insn;
unsigned long sym_value;
unsigned long unsigned_value;
unsigned short r_type;
long signed_value;
unsigned long addr = reloc_entry->address ; /*+ input_section->vma*/
bfd_byte *hit_data =addr + (bfd_byte *)(data);
r_type = reloc_entry->howto->type;
if (output_bfd) {
/* Partial linking - do nothing */
reloc_entry->address += input_section->output_offset;
return bfd_reloc_ok;
}
if (symbol_in != NULL
&& bfd_is_und_section (symbol_in->section))
{
/* Keep the state machine happy in case we're called again */
if (r_type == IMAGE_REL_PPC_REFHI)
{
part1_consth_active = true;
part1_consth_value = 0;
}
return(bfd_reloc_undefined);
}
if ((part1_consth_active) && (r_type != IMAGE_REL_PPC_PAIR))
{
part1_consth_active = false;
*error_message = (char *) "Missing PAIR";
return(bfd_reloc_dangerous);
}
sym_value = get_symbol_value(symbol_in);
#if 0
switch (r_type)
{
case R_IREL:
insn = bfd_get_32(abfd, hit_data);
/* Take the value in the field and sign extend it */
signed_value = EXTRACT_HWORD(insn);
signed_value = SIGN_EXTEND_HWORD(signed_value);
signed_value <<= 2;
signed_value += sym_value + reloc_entry->addend;
if (((signed_value + reloc_entry->address) & ~0x3ffff) == 0)
{ /* Absolute jmp/call */
insn |= (1<<24); /* Make it absolute */
signed_value += reloc_entry->address;
/* FIXME: Should we change r_type to R_IABS */
}
else
{
/* Relative jmp/call, so subtract from the value the
address of the place we're coming from */
signed_value -= (input_section->output_section->vma
+ input_section->output_offset);
if (signed_value>0x1ffff || signed_value<-0x20000)
return(bfd_reloc_overflow);
}
signed_value >>= 2;
insn = INSERT_HWORD(insn, signed_value);
bfd_put_32(abfd, insn ,hit_data);
break;
case R_ILOHALF:
insn = bfd_get_32(abfd, hit_data);
unsigned_value = EXTRACT_HWORD(insn);
unsigned_value += sym_value + reloc_entry->addend;
insn = INSERT_HWORD(insn, unsigned_value);
bfd_put_32(abfd, insn, hit_data);
break;
case R_IHIHALF:
insn = bfd_get_32(abfd, hit_data);
/* consth, part 1
Just get the symbol value that is referenced */
part1_consth_active = true;
part1_consth_value = sym_value + reloc_entry->addend;
/* Don't modify insn until R_IHCONST */
break;
case R_IHCONST:
insn = bfd_get_32(abfd, hit_data);
/* consth, part 2
Now relocate the reference */
if (part1_consth_active == false) {
*error_message = (char *) "Missing IHIHALF";
return(bfd_reloc_dangerous);
}
/* sym_ptr_ptr = r_symndx, in coff_slurp_reloc_table() */
unsigned_value = 0; /*EXTRACT_HWORD(insn) << 16;*/
unsigned_value += reloc_entry->addend; /* r_symndx */
unsigned_value += part1_consth_value;
unsigned_value = unsigned_value >> 16;
insn = INSERT_HWORD(insn, unsigned_value);
part1_consth_active = false;
bfd_put_32(abfd, insn, hit_data);
break;
case R_BYTE:
insn = bfd_get_8(abfd, hit_data);
unsigned_value = insn + sym_value + reloc_entry->addend;
if (unsigned_value & 0xffffff00) {
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"byte value too large in module %s\n",
abfd->filename);
return(bfd_reloc_overflow);
}
bfd_put_8(abfd, unsigned_value, hit_data);
break;
case R_HWORD:
insn = bfd_get_16(abfd, hit_data);
unsigned_value = insn + sym_value + reloc_entry->addend;
if (unsigned_value & 0xffff0000) {
fprintf(stderr,"Relocation problem : ");
fprintf(stderr,"hword value too large in module %s\n",
abfd->filename);
return(bfd_reloc_overflow);
}
bfd_put_16(abfd, insn, hit_data);
break;
case R_WORD:
insn = bfd_get_32(abfd, hit_data);
insn += sym_value + reloc_entry->addend;
bfd_put_32(abfd, insn, hit_data);
break;
default:
*error_message = "Unrecognized reloc";
return (bfd_reloc_dangerous);
}
#endif
return(bfd_reloc_ok);
}
/* The reloc processing routine for the optimized COFF linker. */
static boolean
coff_ppc_relocate_section (output_bfd, info, input_bfd, input_section,
contents, relocs, syms, sections)
bfd *output_bfd;
struct bfd_link_info *info;
bfd *input_bfd;
asection *input_section;
bfd_byte *contents;
struct internal_reloc *relocs;
struct internal_syment *syms;
asection **sections;
{
struct internal_reloc *rel;
struct internal_reloc *relend;
boolean hihalf;
bfd_vma hihalf_val;
unsigned short r_type = EXTRACT_TYPE (rel->r_type);
unsigned short r_flags = EXTRACT_FLAGS(rel->r_type);
unsigned short junk = EXTRACT_JUNK (rel->r_type);
/* If we are performing a relocateable link, we don't need to do a
thing. The caller will take care of adjusting the reloc
addresses and symbol indices. */
if (info->relocateable)
return true;
hihalf = false;
hihalf_val = 0;
rel = relocs;
relend = rel + input_section->reloc_count;
for (; rel < relend; rel++)
{
long symndx;
bfd_byte *loc;
struct coff_link_hash_entry *h;
struct internal_syment *sym;
asection *sec;
bfd_vma val;
boolean overflow;
unsigned long insn;
long signed_value;
unsigned long unsigned_value;
bfd_reloc_status_type rstat;
symndx = rel->r_symndx;
loc = contents + rel->r_vaddr - input_section->vma;
if (symndx == -1)
h = NULL;
else
h = obj_coff_sym_hashes (input_bfd)[symndx];
sym = NULL;
sec = NULL;
val = 0;
overflow = false;
switch (r_type)
{
default:
fprintf( stderr, "unsupported reloc %s\n",
ppc_coff_howto_table[r_type].name);
bfd_set_error (bfd_error_bad_value);
return false;
case IMAGE_REL_PPC_TOCREL16:
case IMAGE_REL_PPC_IFGLUE:
case IMAGE_REL_PPC_SECTION:
case IMAGE_REL_PPC_SECREL:
case IMAGE_REL_PPC_IMGLUE:
case IMAGE_REL_PPC_ABSOLUTE:
break;
case IMAGE_REL_PPC_ADDR16:
case IMAGE_REL_PPC_REL24:
case IMAGE_REL_PPC_ADDR24:
case IMAGE_REL_PPC_ADDR32:
case IMAGE_REL_PPC_ADDR32NB:
rstat = _bfd_relocate_contents (ppc_coff_howto_table + r_type,
input_bfd, val, loc);
if (rstat == bfd_reloc_overflow)
overflow = true;
else if (rstat != bfd_reloc_ok)
abort ();
break;
}
if (overflow)
{
const char *name;
char buf[SYMNMLEN + 1];
if (symndx == -1)
name = "*ABS*";
else if (h != NULL)
name = h->root.root.string;
else if (sym == NULL)
name = "*unknown*";
else if (sym->_n._n_n._n_zeroes == 0
&& sym->_n._n_n._n_offset != 0)
name = obj_coff_strings (input_bfd) + sym->_n._n_n._n_offset;
else
{
strncpy (buf, sym->_n._n_name, SYMNMLEN);
buf[SYMNMLEN] = '\0';
name = buf;
}
if (! ((*info->callbacks->reloc_overflow)
(info, name, ppc_coff_howto_table[r_type].name, (bfd_vma) 0,
input_bfd, input_section,
rel->r_vaddr - input_section->vma)))
return false;
}
}
return true;
}
/* Some really cheezy macros that can be turned on to test stderr :-) */
#ifdef DEBUG_RELOC
#define UN_IMPL(x) \
{ \
static int i; \
if (i == 0) \
{ \
i = 1; \
fprintf(stderr,"Unimplemented Relocation -- %s\n",x); \
} \
}
#define DUMP_RELOC(n,r) \
{ \
fprintf(stderr,"%s sym %d, addr %d, addend %d\n", \
n, (*(r->sym_ptr_ptr))->name, \
r->address, r->addend); \
}
#define DUMP_RELOC2(n,r) \
{ \
fprintf(stderr,"%s sym %d, r_vaddr %d\n", \
n, r->r_symndx, r->r_vaddr); \
}
#else
#define UN_IMPL(x)
#define DUMP_RELOC(n,r)
#define DUMP_RELOC2(n,r)
#endif
static bfd_reloc_status_type
ppc_refhi_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("REFHI");
DUMP_RELOC("REFHI",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_undefined;
}
static bfd_reloc_status_type
ppc_reflo_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("REFLO");
DUMP_RELOC("REFLO",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_undefined;
}
static bfd_reloc_status_type
ppc_pair_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("PAIR");
DUMP_RELOC("PAIR",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_undefined;
}
static bfd_reloc_status_type
ppc_toc16_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("TOCREL16");
DUMP_RELOC("TOCREL16",reloc_entry);
if (output_bfd == (bfd *) NULL)
{
return bfd_reloc_continue;
}
return bfd_reloc_ok;
}
/* ADDR32NB : 32 bit address relative to the virtual origin. */
/* (On the alpha, this is always a linker generated thunk)*/
/* (i.e. 32bit addr relative to the image base) */
/* */
/* */
static bfd_reloc_status_type
ppc_addr32nb_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("ADDR32NB");
DUMP_RELOC("ADDR32NB",reloc_entry);
return bfd_reloc_ok;
}
static bfd_reloc_status_type
ppc_secrel_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("SECREL");
DUMP_RELOC("SECREL",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_ok;
}
static bfd_reloc_status_type
ppc_section_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("SECTION");
DUMP_RELOC("SECTION",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_ok;
}
static bfd_reloc_status_type
ppc_imglue_reloc (abfd,
reloc_entry,
symbol,
data,
input_section,
output_bfd,
error_message)
bfd *abfd;
arelent *reloc_entry;
asymbol *symbol;
PTR data;
asection *input_section;
bfd *output_bfd;
char **error_message;
{
UN_IMPL("IMGLUE");
DUMP_RELOC("IMGLUE",reloc_entry);
if (output_bfd == (bfd *) NULL)
return bfd_reloc_continue;
return bfd_reloc_ok;
}
#define MAX_RELOC_INDEX \
(sizeof(ppc_coff_howto_table) / sizeof(ppc_coff_howto_table[0]) - 1)
/* FIXME: There is a possiblity that when we read in a reloc from a file,
that there are some bits encoded in the upper portion of the
type field. Not yet implemented.
*/
static void ppc_coff_rtype2howto PARAMS ((arelent *relent,
struct internal_reloc *internal));
static void
ppc_coff_rtype2howto (relent, internal)
arelent *relent;
struct internal_reloc *internal;
{
/* We can encode one of three things in the type field, aside from the
type:
1. IMAGE_REL_PPC_NEG - indicates the value field is a subtraction
value, rather than an addition value
2. IMAGE_REL_PPC_BRTAKEN, IMAGE_REL_PPC_BRNTAKEN - indicates that
the branch is expected to be taken or not.
3. IMAGE_REL_PPC_TOCDEFN - toc slot definition in the file
For now, we just strip this stuff to find the type, and ignore it other
than that.
*/
unsigned short r_type = EXTRACT_TYPE (internal->r_type);
unsigned short r_flags = EXTRACT_FLAGS(internal->r_type);
unsigned short junk = EXTRACT_JUNK (internal->r_type);
/* the masking process only slices off the bottom byte for r_type. */
if ( r_type > MAX_RELOC_INDEX )
{
fprintf(stderr,
"ppc_coff_rtype2howto: reloc index %d out of range [%d, %d]\n",
internal->r_type, 0, MAX_RELOC_INDEX);
abort();
}
/* check for absolute crap */
if ( junk != 0 )
{
fprintf(stderr,
"ppc_coff_rtype2howto: reloc index %d contains junk %d\n",
internal->r_type, junk);
abort();
}
#ifdef DEBUG_RELOC
/* now examine flags */
if (r_flags != 0)
{
fprintf (stderr, "Reloc with flags found!");
if ( r_flags & IMAGE_REL_PPC_NEG )
fprintf (stderr, " NEG");
if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
fprintf (stderr, " BRTAKEN");
if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
fprintf (stderr, " BRNTAKEN");
if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
fprintf (stderr, " TOCDEFN");
fprintf(stderr, "\n");
}
#endif
switch(r_type)
{
case IMAGE_REL_PPC_ADDR16:
case IMAGE_REL_PPC_REL24:
case IMAGE_REL_PPC_ADDR24:
case IMAGE_REL_PPC_TOCREL16:
case IMAGE_REL_PPC_ADDR32:
case IMAGE_REL_PPC_IFGLUE:
case IMAGE_REL_PPC_ADDR32NB:
case IMAGE_REL_PPC_SECTION:
case IMAGE_REL_PPC_SECREL:
DUMP_RELOC2(ppc_coff_howto_table[r_type].name, internal);
break;
case IMAGE_REL_PPC_IMGLUE:
DUMP_RELOC2(ppc_coff_howto_table[r_type].name, internal);
/* IMGLUE relocs have big numbers in them. Don't know what for yet. */
internal->r_vaddr = 0; /* make it zero for now */
break;
default:
fprintf(stderr,
"Warning: Unsupported reloc %s [%d] used -- it may not work.\n",
ppc_coff_howto_table[r_type].name,
r_type);
break;
}
relent->howto = ppc_coff_howto_table + r_type;
}
static reloc_howto_type *
coff_ppc_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
bfd *abfd;
asection *sec;
struct internal_reloc *rel;
struct coff_link_hash_entry *h;
struct internal_syment *sym;
bfd_vma *addendp;
{
reloc_howto_type *howto;
/* We can encode one of three things in the type field, aside from the
type:
1. IMAGE_REL_PPC_NEG - indicates the value field is a subtraction
value, rather than an addition value
2. IMAGE_REL_PPC_BRTAKEN, IMAGE_REL_PPC_BRNTAKEN - indicates that
the branch is expected to be taken or not.
3. IMAGE_REL_PPC_TOCDEFN - toc slot definition in the file
For now, we just strip this stuff to find the type, and ignore it other
than that.
*/
unsigned short r_type = EXTRACT_TYPE (rel->r_type);
unsigned short r_flags = EXTRACT_FLAGS(rel->r_type);
unsigned short junk = EXTRACT_JUNK (rel->r_type);
/* the masking process only slices off the bottom byte for r_type. */
if ( r_type > MAX_RELOC_INDEX )
{
fprintf(stderr,
"coff_ppc_rtype_to_howto: index %d out of range [%d, %d]\n",
r_type, 0, MAX_RELOC_INDEX);
abort();
}
/* check for absolute crap */
if ( junk != 0 )
{
fprintf(stderr,
"coff_ppc_rtype_to_howto: reloc index %d contains junk %d\n",
rel->r_type, junk);
abort();
}
#ifdef DEBUG_RELOC
/* now examine flags */
if (r_flags != 0)
{
fprintf (stderr, "Reloc with flags found!");
if ( r_flags & IMAGE_REL_PPC_NEG )
fprintf (stderr, " NEG");
if ( r_flags & IMAGE_REL_PPC_BRTAKEN )
fprintf (stderr, " BRTAKEN");
if ( r_flags & IMAGE_REL_PPC_BRNTAKEN )
fprintf (stderr, " BRNTAKEN");
if ( r_flags & IMAGE_REL_PPC_TOCDEFN )
fprintf (stderr, " TOCDEFN");
fprintf(stderr, "\n");
}
#endif
switch(r_type)
{
case IMAGE_REL_PPC_ADDR32NB:
DUMP_RELOC2(ppc_coff_howto_table[r_type].name, rel);
*addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
break;
case IMAGE_REL_PPC_ADDR16:
case IMAGE_REL_PPC_REL24:
case IMAGE_REL_PPC_ADDR24:
case IMAGE_REL_PPC_TOCREL16:
case IMAGE_REL_PPC_ADDR32:
case IMAGE_REL_PPC_IFGLUE:
case IMAGE_REL_PPC_SECTION:
case IMAGE_REL_PPC_SECREL:
DUMP_RELOC2(ppc_coff_howto_table[r_type].name, rel);
break;
case IMAGE_REL_PPC_IMGLUE:
DUMP_RELOC2(ppc_coff_howto_table[r_type].name, rel);
/* IMGLUE relocs have big numbers in them. Don't know what for yet. */
rel->r_vaddr = 0; /* make it zero for now */
break;
default:
fprintf(stderr,
"Warning: Unsupported reloc %s [%d] used -- it may not work.\n",
ppc_coff_howto_table[r_type].name,
r_type);
break;
}
howto = ppc_coff_howto_table + r_type;
return howto;
}
/* a cheesy little macro to make the code a little more readable */
#define HOW2MAP(bfd_rtype,ppc_rtype) \
case bfd_rtype: return &ppc_coff_howto_table[ppc_rtype]
static reloc_howto_type *ppc_coff_reloc_type_lookup
PARAMS ((bfd *, bfd_reloc_code_real_type));
static reloc_howto_type *
ppc_coff_reloc_type_lookup (abfd, code)
bfd *abfd;
bfd_reloc_code_real_type code;
{
#ifdef DEBUG_RELOC
fprintf(stderr, "ppc_coff_reloc_type_lookup for %s\n",
bfd_get_reloc_code_name(code));
#endif
switch (code)
{
HOW2MAP(BFD_RELOC_16_GOT_PCREL, IMAGE_REL_PPC_IFGLUE);
HOW2MAP(BFD_RELOC_16, IMAGE_REL_PPC_ADDR16);
HOW2MAP(BFD_RELOC_PPC_B26, IMAGE_REL_PPC_REL24);
HOW2MAP(BFD_RELOC_PPC_BA26, IMAGE_REL_PPC_ADDR24);
HOW2MAP(BFD_RELOC_PPC_TOC16, IMAGE_REL_PPC_TOCREL16);
HOW2MAP(BFD_RELOC_32, IMAGE_REL_PPC_ADDR32);
default: return NULL;
}
return NULL;
}
#undef HOW2MAP
/* Tailor coffcode.h -- macro heaven. */
#define RTYPE2HOWTO(cache_ptr, dst) ppc_coff_rtype2howto (cache_ptr, dst)
/* We use the special COFF backend linker. */
/* #define coff_relocate_section _bfd_coff_generic_relocate_section */
#define coff_bfd_reloc_type_lookup ppc_coff_reloc_type_lookup
#define coff_rtype_to_howto coff_ppc_rtype_to_howto
#define coff_relocate_section coff_ppc_relocate_section
#define SELECT_RELOC(internal, howto) {internal.r_type=howto->type;}
#define COFF_PAGE_SIZE 0x1000
#include "coffcode.h"
/* The transfer vectors that lead the outside world to all of the above. */
#ifdef TARGET_LITTLE_SYM
const bfd_target
TARGET_LITTLE_SYM =
{
TARGET_LITTLE_NAME, /* name or coff-arm-little */
bfd_target_coff_flavour,
false, /* data byte order is little */
false, /* header byte order is little */
(HAS_RELOC | EXEC_P | /* FIXME: object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
0, /* leading char */
'/', /* ar_pad_char */
15, /* ar_max_namelen??? FIXMEmgo */
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, coff_object_p, /* bfd_check_format */
bfd_generic_archive_p, /* _bfd_dummy_target */ coff_object_p },
{bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
bfd_false},
{bfd_false, coff_write_object_contents, /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
BFD_JUMP_TABLE_GENERIC (coff),
BFD_JUMP_TABLE_COPY (coff),
BFD_JUMP_TABLE_CORE (_bfd_nocore),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (coff),
BFD_JUMP_TABLE_RELOCS (coff),
BFD_JUMP_TABLE_WRITE (coff),
BFD_JUMP_TABLE_LINK (coff),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
COFF_SWAP_TABLE,
};
#endif
#ifdef TARGET_BIG_SYM
const bfd_target
TARGET_BIG_SYM =
{
TARGET_BIG_NAME,
bfd_target_coff_flavour,
true, /* data byte order is big */
true, /* header byte order is big */
(HAS_RELOC | EXEC_P | /* FIXME: object flags */
HAS_LINENO | HAS_DEBUG |
HAS_SYMS | HAS_LOCALS | WP_TEXT),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
0, /* leading char */
'/', /* ar_pad_char */
15, /* ar_max_namelen??? FIXMEmgo */
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, coff_object_p, /* bfd_check_format */
bfd_generic_archive_p, /* _bfd_dummy_target */ coff_object_p },
{bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
bfd_false},
{bfd_false, coff_write_object_contents, /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
BFD_JUMP_TABLE_GENERIC (coff),
BFD_JUMP_TABLE_COPY (coff),
BFD_JUMP_TABLE_CORE (_bfd_nocore),
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
BFD_JUMP_TABLE_SYMBOLS (coff),
BFD_JUMP_TABLE_RELOCS (coff),
BFD_JUMP_TABLE_WRITE (coff),
BFD_JUMP_TABLE_LINK (coff),
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
COFF_SWAP_TABLE,
};
#endif
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