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37e3922eed
binutils-gdb/bfd/pdp11.c
Nick Clifton 37e3922eed Fix memory access violations triggered by running dlltool on corrupt binaries. 
PR binutils/17512
	* dlltool.c (identify_search_archive): If the last archive was the
	same as the current archive, terminate the loop.

	* pdp11.c (aout_get_external_symbols): Return false if there are
	no symbols.
2015-01-27 11:30:15 +00:00

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/* BFD back-end for PDP-11 a.out binaries.
Copyright (C) 2001-2015 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. */
/* BFD backend for PDP-11, running 2.11BSD in particular.
This file was hacked up by looking hard at the existing vaxnetbsd
back end and the header files in 2.11BSD.
TODO
* support for V7 file formats
* support for overlay object files (see 2.11 a.out(5))
* support for old and very old archives
(see 2.11 ar(5), historical section)
Search for TODO to find other areas needing more work. */
#define BYTES_IN_WORD 2
#define BYTES_IN_LONG 4
#define ARCH_SIZE 16
#undef TARGET_IS_BIG_ENDIAN_P
#define TARGET_PAGE_SIZE 1024
#define SEGMENT__SIZE TARGET_PAGE_SIZE
#define DEFAULT_ARCH bfd_arch_pdp11
#define DEFAULT_MID M_PDP11
/* 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 (pdp11_aout_,OP)
/* This needs to start with a.out so GDB knows it is an a.out variant. */
#define TARGETNAME "a.out-pdp11"
/* This is the normal load address for executables. */
#define TEXT_START_ADDR 0
/* The header is not included in the text segment. */
#define N_HEADER_IN_TEXT(x) 0
/* There is no flags field. */
#define N_FLAGS(exec) 0
#define N_SET_FLAGS(exec, flags) do { } while (0)
#define N_BADMAG(x) (N_MAGIC(x) != OMAGIC \
&& N_MAGIC(x) != NMAGIC \
&& N_MAGIC(x) != ZMAGIC)
#include "sysdep.h"
#include "bfd.h"
#define external_exec pdp11_external_exec
struct pdp11_external_exec
{
bfd_byte e_info[2]; /* Magic number. */
bfd_byte e_text[2]; /* Length of text section in bytes. */
bfd_byte e_data[2]; /* Length of data section in bytes. */
bfd_byte e_bss[2]; /* Length of bss area in bytes. */
bfd_byte e_syms[2]; /* Length of symbol table in bytes. */
bfd_byte e_entry[2]; /* Start address. */
bfd_byte e_unused[2]; /* Not used. */
bfd_byte e_flag[2]; /* Relocation info stripped. */
bfd_byte e_relocatable; /* Ugly hack. */
};
#define EXEC_BYTES_SIZE (8 * 2)
#define A_MAGIC1 OMAGIC
#define OMAGIC 0407 /* ...object file or impure executable. */
#define A_MAGIC2 NMAGIC
#define NMAGIC 0410 /* Pure executable. */
#define ZMAGIC 0413 /* Demand-paged executable. */
#define A_MAGIC3 0411 /* Separated I&D. */
#define A_MAGIC4 0405 /* Overlay. */
#define A_MAGIC5 0430 /* Auto-overlay (nonseparate). */
#define A_MAGIC6 0431 /* Auto-overlay (separate). */
#define QMAGIC 0
#define BMAGIC 0
#define A_FLAG_RELOC_STRIPPED 0x0001
#define external_nlist pdp11_external_nlist
struct pdp11_external_nlist
{
bfd_byte e_unused[2]; /* Unused. */
bfd_byte e_strx[2]; /* Index into string table of name. */
bfd_byte e_type[1]; /* Type of symbol. */
bfd_byte e_ovly[1]; /* Overlay number. */
bfd_byte e_value[2]; /* Value of symbol. */
};
#define EXTERNAL_NLIST_SIZE 8
#define N_TXTOFF(x) (EXEC_BYTES_SIZE)
#define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
#define N_TRELOFF(x) (N_DATOFF(x) + (x).a_data)
#define N_DRELOFF(x) (N_TRELOFF(x) + (x).a_trsize)
#define N_SYMOFF(x) (N_DRELOFF(x) + (x).a_drsize)
#define N_STROFF(x) (N_SYMOFF(x) + (x).a_syms)
#define WRITE_HEADERS(abfd, execp) pdp11_aout_write_headers (abfd, execp)
#include "libbfd.h"
#include "libaout.h"
#define SWAP_MAGIC(ext) bfd_getl16 (ext)
#define MY_entry_is_text_address 1
#define MY_write_object_contents MY(write_object_contents)
static bfd_boolean MY(write_object_contents) (bfd *);
#define MY_text_includes_header 1
#define MY_BFD_TARGET
#include "aout-target.h"
/* Start of modified aoutx.h. */
#define KEEPIT udata.i
#include <string.h> /* For strchr and friends. */
#include "bfd.h"
#include "sysdep.h"
#include "safe-ctype.h"
#include "bfdlink.h"
#include "libaout.h"
#include "aout/aout64.h"
#include "aout/stab_gnu.h"
#include "aout/ar.h"
#undef N_TYPE
#undef N_UNDF
#undef N_ABS
#undef N_TEXT
#undef N_DATA
#undef N_BSS
#undef N_REG
#undef N_FN
#undef N_EXT
#define N_TYPE 0x1f /* Type mask. */
#define N_UNDF 0x00 /* Undefined. */
#define N_ABS 0x01 /* Absolute. */
#define N_TEXT 0x02 /* Text segment. */
#define N_DATA 0x03 /* Data segment. */
#define N_BSS 0x04 /* Bss segment. */
#define N_REG 0x14 /* Register symbol. */
#define N_FN 0x1f /* File name. */
#define N_EXT 0x20 /* External flag. */
#define RELOC_SIZE 2
#define RELFLG 0x0001 /* PC-relative flag. */
#define RTYPE 0x000e /* Type mask. */
#define RIDXMASK 0xfff0 /* Index mask. */
#define RABS 0x00 /* Absolute. */
#define RTEXT 0x02 /* Text. */
#define RDATA 0x04 /* Data. */
#define RBSS 0x06 /* Bss. */
#define REXT 0x08 /* External. */
#define RINDEX(x) (((x) & 0xfff0) >> 4)
#ifndef MY_final_link_relocate
#define MY_final_link_relocate _bfd_final_link_relocate
#endif
#ifndef MY_relocate_contents
#define MY_relocate_contents _bfd_relocate_contents
#endif
/* A hash table used for header files with N_BINCL entries. */
struct aout_link_includes_table
{
struct bfd_hash_table root;
};
/* A linked list of totals that we have found for a particular header
file. */
struct aout_link_includes_totals
{
struct aout_link_includes_totals *next;
bfd_vma total;
};
/* An entry in the header file hash table. */
struct aout_link_includes_entry
{
struct bfd_hash_entry root;
/* List of totals we have found for this file. */
struct aout_link_includes_totals *totals;
};
/* During the final link step we need to pass around a bunch of
information, so we do it in an instance of this structure. */
struct aout_final_link_info
{
/* General link information. */
struct bfd_link_info *info;
/* Output bfd. */
bfd *output_bfd;
/* Reloc file positions. */
file_ptr treloff, dreloff;
/* File position of symbols. */
file_ptr symoff;
/* String table. */
struct bfd_strtab_hash *strtab;
/* Header file hash table. */
struct aout_link_includes_table includes;
/* A buffer large enough to hold the contents of any section. */
bfd_byte *contents;
/* A buffer large enough to hold the relocs of any section. */
void * relocs;
/* A buffer large enough to hold the symbol map of any input BFD. */
int *symbol_map;
/* A buffer large enough to hold output symbols of any input BFD. */
struct external_nlist *output_syms;
};
reloc_howto_type howto_table_pdp11[] =
{
/* type rs size bsz pcrel bitpos ovrf sf name part_inpl readmask setmask pcdone */
HOWTO( 0, 0, 1, 16, FALSE, 0, complain_overflow_signed,0,"16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
HOWTO( 1, 0, 1, 16, TRUE, 0, complain_overflow_signed,0,"DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
};
#define TABLE_SIZE(TABLE) (sizeof(TABLE)/sizeof(TABLE[0]))
static bfd_boolean aout_link_check_archive_element (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *, const char *, bfd_boolean *);
static bfd_boolean aout_link_add_object_symbols (bfd *, struct bfd_link_info *);
static bfd_boolean aout_link_add_symbols (bfd *, struct bfd_link_info *);
static bfd_boolean aout_link_write_symbols (struct aout_final_link_info *, bfd *);
reloc_howto_type *
NAME (aout, reloc_type_lookup) (bfd * abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
switch (code)
{
case BFD_RELOC_16:
return &howto_table_pdp11[0];
case BFD_RELOC_16_PCREL:
return &howto_table_pdp11[1];
default:
return NULL;
}
}
reloc_howto_type *
NAME (aout, reloc_name_lookup) (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
unsigned int i;
for (i = 0;
i < sizeof (howto_table_pdp11) / sizeof (howto_table_pdp11[0]);
i++)
if (howto_table_pdp11[i].name != NULL
&& strcasecmp (howto_table_pdp11[i].name, r_name) == 0)
return &howto_table_pdp11[i];
return NULL;
}
static int
pdp11_aout_write_headers (bfd *abfd, struct internal_exec *execp)
{
struct external_exec exec_bytes;
bfd_size_type text_size;
file_ptr text_end;
if (adata(abfd).magic == undecided_magic)
NAME (aout, adjust_sizes_and_vmas) (abfd, &text_size, &text_end);
execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE;
execp->a_entry = bfd_get_start_address (abfd);
if (obj_textsec (abfd)->reloc_count > 0
|| obj_datasec (abfd)->reloc_count > 0)
{
execp->a_trsize = execp->a_text;
execp->a_drsize = execp->a_data;
}
else
{
execp->a_trsize = 0;
execp->a_drsize = 0;
}
NAME (aout, swap_exec_header_out) (abfd, execp, & exec_bytes);
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
return FALSE;
if (bfd_bwrite ((void *) &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_outsymbols (abfd) != NULL
&& 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 (obj_textsec (abfd)->reloc_count > 0
|| obj_datasec (abfd)->reloc_count > 0)
{
if (bfd_seek (abfd, (file_ptr) (N_TRELOFF(*execp)), SEEK_SET) != 0
|| !NAME (aout, squirt_out_relocs) (abfd, obj_textsec (abfd))
|| bfd_seek (abfd, (file_ptr) (N_DRELOFF(*execp)), SEEK_SET) != 0
|| !NAME (aout, squirt_out_relocs) (abfd, obj_datasec (abfd)))
return FALSE;
}
return TRUE;
}
/* Write an object file.
Section contents have already been written. We write the
file header, symbols, and relocation. */
static bfd_boolean
MY(write_object_contents) (bfd *abfd)
{
struct internal_exec *execp = exec_hdr (abfd);
/* We must make certain that the magic number has been set. This
will normally have been done by set_section_contents, but only if
there actually are some section contents. */
if (! abfd->output_has_begun)
{
bfd_size_type text_size;
file_ptr text_end;
NAME (aout, adjust_sizes_and_vmas) (abfd, &text_size, &text_end);
}
obj_reloc_entry_size (abfd) = RELOC_SIZE;
return WRITE_HEADERS (abfd, execp);
}
/* Swap the information in an executable header @var{raw_bytes} taken
from a raw byte stream memory image into the internal exec header
structure "execp". */
#ifndef NAME_swap_exec_header_in
void
NAME (aout, swap_exec_header_in) (bfd *abfd,
struct external_exec *bytes,
struct internal_exec *execp)
{
/* The internal_exec structure has some fields that are unused in this
configuration (IE for i960), so ensure that all such uninitialized
fields are zero'd out. There are places where two of these structs
are memcmp'd, and thus the contents do matter. */
memset ((void *) execp, 0, sizeof (struct internal_exec));
/* Now fill in fields in the execp, from the bytes in the raw data. */
execp->a_info = GET_MAGIC (abfd, bytes->e_info);
execp->a_text = GET_WORD (abfd, bytes->e_text);
execp->a_data = GET_WORD (abfd, bytes->e_data);
execp->a_bss = GET_WORD (abfd, bytes->e_bss);
execp->a_syms = GET_WORD (abfd, bytes->e_syms);
execp->a_entry = GET_WORD (abfd, bytes->e_entry);
if (GET_WORD (abfd, bytes->e_flag) & A_FLAG_RELOC_STRIPPED)
{
execp->a_trsize = 0;
execp->a_drsize = 0;
}
else
{
execp->a_trsize = execp->a_text;
execp->a_drsize = execp->a_data;
}
}
#define NAME_swap_exec_header_in NAME (aout, swap_exec_header_in)
#endif
/* Swap the information in an internal exec header structure
"execp" into the buffer "bytes" ready for writing to disk. */
void
NAME (aout, swap_exec_header_out) (bfd *abfd,
struct internal_exec *execp,
struct external_exec *bytes)
{
/* Now fill in fields in the raw data, from the fields in the exec struct. */
PUT_MAGIC (abfd, execp->a_info, bytes->e_info);
PUT_WORD (abfd, execp->a_text, bytes->e_text);
PUT_WORD (abfd, execp->a_data, bytes->e_data);
PUT_WORD (abfd, execp->a_bss, bytes->e_bss);
PUT_WORD (abfd, execp->a_syms, bytes->e_syms);
PUT_WORD (abfd, execp->a_entry, bytes->e_entry);
PUT_WORD (abfd, 0, bytes->e_unused);
if ((execp->a_trsize == 0 || execp->a_text == 0)
&& (execp->a_drsize == 0 || execp->a_data == 0))
PUT_WORD (abfd, A_FLAG_RELOC_STRIPPED, bytes->e_flag);
else if (execp->a_trsize == execp->a_text
&& execp->a_drsize == execp->a_data)
PUT_WORD (abfd, 0, bytes->e_flag);
else
{
/* TODO: print a proper warning message. */
fprintf (stderr, "BFD:%s:%d: internal error\n", __FILE__, __LINE__);
PUT_WORD (abfd, 0, bytes->e_flag);
}
}
/* Make all the section for an a.out file. */
bfd_boolean
NAME (aout, make_sections) (bfd *abfd)
{
if (obj_textsec (abfd) == NULL && bfd_make_section (abfd, ".text") == NULL)
return FALSE;
if (obj_datasec (abfd) == NULL && bfd_make_section (abfd, ".data") == NULL)
return FALSE;
if (obj_bsssec (abfd) == NULL && bfd_make_section (abfd, ".bss") == NULL)
return FALSE;
return TRUE;
}
/* Some a.out variant thinks that the file open in ABFD
checking is an a.out file. Do some more checking, and set up
for access if it really is. Call back to the calling
environment's "finish up" function just before returning, to
handle any last-minute setup. */
const bfd_target *
NAME (aout, some_aout_object_p) (bfd *abfd,
struct internal_exec *execp,
const bfd_target *(*callback_to_real_object_p) (bfd *))
{
struct aout_data_struct *rawptr, *oldrawptr;
const bfd_target *result;
bfd_size_type amt = sizeof (struct aout_data_struct);
rawptr = bfd_zalloc (abfd, amt);
if (rawptr == NULL)
return 0;
oldrawptr = abfd->tdata.aout_data;
abfd->tdata.aout_data = rawptr;
/* Copy the contents of the old tdata struct.
In particular, we want the subformat, since for hpux it was set in
hp300hpux.c:swap_exec_header_in and will be used in
hp300hpux.c:callback. */
if (oldrawptr != NULL)
*abfd->tdata.aout_data = *oldrawptr;
abfd->tdata.aout_data->a.hdr = &rawptr->e;
*(abfd->tdata.aout_data->a.hdr) = *execp; /* Copy in the internal_exec struct. */
execp = abfd->tdata.aout_data->a.hdr;
/* Set the file flags. */
abfd->flags = BFD_NO_FLAGS;
if (execp->a_drsize || execp->a_trsize)
abfd->flags |= HAS_RELOC;
/* Setting of EXEC_P has been deferred to the bottom of this function. */
if (execp->a_syms)
abfd->flags |= HAS_LINENO | HAS_DEBUG | HAS_SYMS | HAS_LOCALS;
if (N_DYNAMIC(*execp))
abfd->flags |= DYNAMIC;
if (N_MAGIC (*execp) == ZMAGIC)
{
abfd->flags |= D_PAGED | WP_TEXT;
adata (abfd).magic = z_magic;
}
else if (N_MAGIC (*execp) == NMAGIC)
{
abfd->flags |= WP_TEXT;
adata (abfd).magic = n_magic;
}
else if (N_MAGIC (*execp) == OMAGIC)
adata (abfd).magic = o_magic;
else
{
/* Should have been checked with N_BADMAG before this routine
was called. */
abort ();
}
bfd_get_start_address (abfd) = execp->a_entry;
obj_aout_symbols (abfd) = NULL;
bfd_get_symcount (abfd) = execp->a_syms / sizeof (struct external_nlist);
/* The default relocation entry size is that of traditional V7 Unix. */
obj_reloc_entry_size (abfd) = RELOC_SIZE;
/* The default symbol entry size is that of traditional Unix. */
obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE;
#ifdef USE_MMAP
bfd_init_window (&obj_aout_sym_window (abfd));
bfd_init_window (&obj_aout_string_window (abfd));
#endif
obj_aout_external_syms (abfd) = NULL;
obj_aout_external_strings (abfd) = NULL;
obj_aout_sym_hashes (abfd) = NULL;
if (! NAME (aout, make_sections) (abfd))
return NULL;
obj_datasec (abfd)->size = execp->a_data;
obj_bsssec (abfd)->size = execp->a_bss;
obj_textsec (abfd)->flags =
(execp->a_trsize != 0
? (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS | SEC_RELOC)
: (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS));
obj_datasec (abfd)->flags =
(execp->a_drsize != 0
? (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS | SEC_RELOC)
: (SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_HAS_CONTENTS));
obj_bsssec (abfd)->flags = SEC_ALLOC;
#ifdef THIS_IS_ONLY_DOCUMENTATION
/* The common code can't fill in these things because they depend
on either the start address of the text segment, the rounding
up of virtual addresses between segments, or the starting file
position of the text segment -- all of which varies among different
versions of a.out. */
/* Call back to the format-dependent code to fill in the rest of the
fields and do any further cleanup. Things that should be filled
in by the callback: */
struct exec *execp = exec_hdr (abfd);
obj_textsec (abfd)->size = N_TXTSIZE(*execp);
/* Data and bss are already filled in since they're so standard. */
/* The virtual memory addresses of the sections. */
obj_textsec (abfd)->vma = N_TXTADDR(*execp);
obj_datasec (abfd)->vma = N_DATADDR(*execp);
obj_bsssec (abfd)->vma = N_BSSADDR(*execp);
/* The file offsets of the sections. */
obj_textsec (abfd)->filepos = N_TXTOFF(*execp);
obj_datasec (abfd)->filepos = N_DATOFF(*execp);
/* The file offsets of the relocation info. */
obj_textsec (abfd)->rel_filepos = N_TRELOFF(*execp);
obj_datasec (abfd)->rel_filepos = N_DRELOFF(*execp);
/* The file offsets of the string table and symbol table. */
obj_str_filepos (abfd) = N_STROFF (*execp);
obj_sym_filepos (abfd) = N_SYMOFF (*execp);
/* Determine the architecture and machine type of the object file. */
abfd->obj_arch = bfd_arch_obscure;
adata(abfd)->page_size = TARGET_PAGE_SIZE;
adata(abfd)->segment_size = SEGMENT_SIZE;
adata(abfd)->exec_bytes_size = EXEC_BYTES_SIZE;
return abfd->xvec;
/* The architecture is encoded in various ways in various a.out variants,
or is not encoded at all in some of them. The relocation size depends
on the architecture and the a.out variant. Finally, the return value
is the bfd_target vector in use. If an error occurs, return zero and
set bfd_error to the appropriate error code.
Formats such as b.out, which have additional fields in the a.out
header, should cope with them in this callback as well. */
#endif /* DOCUMENTATION */
result = (*callback_to_real_object_p)(abfd);
/* Now that the segment addresses have been worked out, take a better
guess at whether the file is executable. If the entry point
is within the text segment, assume it is. (This makes files
executable even if their entry point address is 0, as long as
their text starts at zero.).
This test had to be changed to deal with systems where the text segment
runs at a different location than the default. The problem is that the
entry address can appear to be outside the text segment, thus causing an
erroneous conclusion that the file isn't executable.
To fix this, we now accept any non-zero entry point as an indication of
executability. This will work most of the time, since only the linker
sets the entry point, and that is likely to be non-zero for most systems. */
if (execp->a_entry != 0
|| (execp->a_entry >= obj_textsec(abfd)->vma
&& execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->size))
abfd->flags |= EXEC_P;
#ifdef STAT_FOR_EXEC
else
{
struct stat stat_buf;
/* The original heuristic doesn't work in some important cases.
The a.out file has no information about the text start
address. For files (like kernels) linked to non-standard
addresses (ld -Ttext nnn) the entry point may not be between
the default text start (obj_textsec(abfd)->vma) and
(obj_textsec(abfd)->vma) + text size. This is not just a mach
issue. Many kernels are loaded at non standard addresses. */
if (abfd->iostream != NULL
&& (abfd->flags & BFD_IN_MEMORY) == 0
&& (fstat(fileno((FILE *) (abfd->iostream)), &stat_buf) == 0)
&& ((stat_buf.st_mode & 0111) != 0))
abfd->flags |= EXEC_P;
}
#endif /* STAT_FOR_EXEC */
if (!result)
{
free (rawptr);
abfd->tdata.aout_data = oldrawptr;
}
return result;
}
/* Initialize ABFD for use with a.out files. */
bfd_boolean
NAME (aout, mkobject) (bfd *abfd)
{
struct aout_data_struct *rawptr;
bfd_size_type amt = sizeof (struct aout_data_struct);
bfd_set_error (bfd_error_system_call);
/* Use an intermediate variable for clarity. */
rawptr = bfd_zalloc (abfd, amt);
if (rawptr == NULL)
return FALSE;
abfd->tdata.aout_data = rawptr;
exec_hdr (abfd) = &(rawptr->e);
obj_textsec (abfd) = NULL;
obj_datasec (abfd) = NULL;
obj_bsssec (abfd) = NULL;
return TRUE;
}
/* Keep track of machine architecture and machine type for
a.out's. Return the <<machine_type>> for a particular
architecture and machine, or <<M_UNKNOWN>> if that exact architecture
and machine can't be represented in a.out format.
If the architecture is understood, machine type 0 (default)
is always understood. */
enum machine_type
NAME (aout, machine_type) (enum bfd_architecture arch,
unsigned long machine,
bfd_boolean *unknown)
{
enum machine_type arch_flags;
arch_flags = M_UNKNOWN;
*unknown = TRUE;
switch (arch)
{
case bfd_arch_sparc:
if (machine == 0
|| machine == bfd_mach_sparc
|| machine == bfd_mach_sparc_sparclite
|| machine == bfd_mach_sparc_v9)
arch_flags = M_SPARC;
else if (machine == bfd_mach_sparc_sparclet)
arch_flags = M_SPARCLET;
break;
case bfd_arch_m68k:
switch (machine)
{
case 0: arch_flags = M_68010; break;
case bfd_mach_m68000: arch_flags = M_UNKNOWN; *unknown = FALSE; break;
case bfd_mach_m68010: arch_flags = M_68010; break;
case bfd_mach_m68020: arch_flags = M_68020; break;
default: arch_flags = M_UNKNOWN; break;
}
break;
case bfd_arch_i386:
if (machine == 0
|| machine == bfd_mach_i386_i386
|| machine == bfd_mach_i386_i386_intel_syntax)
arch_flags = M_386;
break;
case bfd_arch_arm:
if (machine == 0) arch_flags = M_ARM;
break;
case bfd_arch_mips:
switch (machine)
{
case 0:
case 2000:
case bfd_mach_mips3000:
arch_flags = M_MIPS1;
break;
case bfd_mach_mips4000: /* MIPS3 */
case bfd_mach_mips4400:
case bfd_mach_mips8000: /* MIPS4 */
case bfd_mach_mips6000: /* Real MIPS2: */
arch_flags = M_MIPS2;
break;
default:
arch_flags = M_UNKNOWN;
break;
}
break;
case bfd_arch_ns32k:
switch (machine)
{
case 0: arch_flags = M_NS32532; break;
case 32032: arch_flags = M_NS32032; break;
case 32532: arch_flags = M_NS32532; break;
default: arch_flags = M_UNKNOWN; break;
}
break;
case bfd_arch_pdp11:
/* TODO: arch_flags = M_PDP11; */
*unknown = FALSE;
break;
case bfd_arch_vax:
*unknown = FALSE;
break;
default:
arch_flags = M_UNKNOWN;
}
if (arch_flags != M_UNKNOWN)
*unknown = FALSE;
return arch_flags;
}
/* Set the architecture and the machine of the ABFD to the
values ARCH and MACHINE. Verify that @ABFD's format
can support the architecture required. */
bfd_boolean
NAME (aout, set_arch_mach) (bfd *abfd,
enum bfd_architecture arch,
unsigned long machine)
{
if (! bfd_default_set_arch_mach (abfd, arch, machine))
return FALSE;
if (arch != bfd_arch_unknown)
{
bfd_boolean unknown;
NAME (aout, machine_type) (arch, machine, &unknown);
if (unknown)
return FALSE;
}
obj_reloc_entry_size (abfd) = RELOC_SIZE;
return (*aout_backend_info(abfd)->set_sizes) (abfd);
}
static void
adjust_o_magic (bfd *abfd, struct internal_exec *execp)
{
file_ptr pos = adata (abfd).exec_bytes_size;
bfd_vma vma = 0;
int pad = 0;
/* Text. */
obj_textsec (abfd)->filepos = pos;
if (! obj_textsec (abfd)->user_set_vma)
obj_textsec (abfd)->vma = vma;
else
vma = obj_textsec (abfd)->vma;
pos += obj_textsec (abfd)->size;
vma += obj_textsec (abfd)->size;
/* Data. */
if (!obj_datasec (abfd)->user_set_vma)
{
obj_textsec (abfd)->size += pad;
pos += pad;
vma += pad;
obj_datasec (abfd)->vma = vma;
}
else
vma = obj_datasec (abfd)->vma;
obj_datasec (abfd)->filepos = pos;
pos += obj_datasec (abfd)->size;
vma += obj_datasec (abfd)->size;
/* BSS. */
if (! obj_bsssec (abfd)->user_set_vma)
{
obj_datasec (abfd)->size += pad;
pos += pad;
vma += pad;
obj_bsssec (abfd)->vma = vma;
}
else
{
/* The VMA of the .bss section is set by the VMA of the
.data section plus the size of the .data section. We may
need to add padding bytes to make this true. */
pad = obj_bsssec (abfd)->vma - vma;
if (pad > 0)
{
obj_datasec (abfd)->size += pad;
pos += pad;
}
}
obj_bsssec (abfd)->filepos = pos;
/* Fix up the exec header. */
execp->a_text = obj_textsec (abfd)->size;
execp->a_data = obj_datasec (abfd)->size;
execp->a_bss = obj_bsssec (abfd)->size;
N_SET_MAGIC (*execp, OMAGIC);
}
static void
adjust_z_magic (bfd *abfd, struct internal_exec *execp)
{
bfd_size_type data_pad, text_pad;
file_ptr text_end;
const struct aout_backend_data *abdp;
int ztih; /* Nonzero if text includes exec header. */
abdp = aout_backend_info (abfd);
/* Text. */
ztih = (abdp != NULL
&& (abdp->text_includes_header
|| obj_aout_subformat (abfd) == q_magic_format));
obj_textsec(abfd)->filepos = (ztih
? adata(abfd).exec_bytes_size
: adata(abfd).zmagic_disk_block_size);
if (! obj_textsec(abfd)->user_set_vma)
{
/* ?? Do we really need to check for relocs here? */
obj_textsec(abfd)->vma = ((abfd->flags & HAS_RELOC)
? 0
: (ztih
? (abdp->default_text_vma
+ adata (abfd).exec_bytes_size)
: abdp->default_text_vma));
text_pad = 0;
}
else
{
/* The .text section is being loaded at an unusual address. We
may need to pad it such that the .data section starts at a page
boundary. */
if (ztih)
text_pad = ((obj_textsec (abfd)->filepos - obj_textsec (abfd)->vma)
& (adata (abfd).page_size - 1));
else
text_pad = ((- obj_textsec (abfd)->vma)
& (adata (abfd).page_size - 1));
}
/* Find start of data. */
if (ztih)
{
text_end = obj_textsec (abfd)->filepos + obj_textsec (abfd)->size;
text_pad += BFD_ALIGN (text_end, adata (abfd).page_size) - text_end;
}
else
{
/* Note that if page_size == zmagic_disk_block_size, then
filepos == page_size, and this case is the same as the ztih
case. */
text_end = obj_textsec (abfd)->size;
text_pad += BFD_ALIGN (text_end, adata (abfd).page_size) - text_end;
text_end += obj_textsec (abfd)->filepos;
}
obj_textsec (abfd)->size += text_pad;
text_end += text_pad;
/* Data. */
if (!obj_datasec(abfd)->user_set_vma)
{
bfd_vma vma;
vma = obj_textsec(abfd)->vma + obj_textsec(abfd)->size;
obj_datasec(abfd)->vma = BFD_ALIGN (vma, adata(abfd).segment_size);
}
if (abdp && abdp->zmagic_mapped_contiguous)
{
text_pad = (obj_datasec(abfd)->vma
- obj_textsec(abfd)->vma
- obj_textsec(abfd)->size);
obj_textsec(abfd)->size += text_pad;
}
obj_datasec (abfd)->filepos = (obj_textsec (abfd)->filepos
+ obj_textsec (abfd)->size);
/* Fix up exec header while we're at it. */
execp->a_text = obj_textsec(abfd)->size;
if (ztih && (!abdp || (abdp && !abdp->exec_header_not_counted)))
execp->a_text += adata(abfd).exec_bytes_size;
N_SET_MAGIC (*execp, ZMAGIC);
/* Spec says data section should be rounded up to page boundary. */
obj_datasec(abfd)->size
= align_power (obj_datasec(abfd)->size,
obj_bsssec(abfd)->alignment_power);
execp->a_data = BFD_ALIGN (obj_datasec(abfd)->size,
adata(abfd).page_size);
data_pad = execp->a_data - obj_datasec(abfd)->size;
/* BSS. */
if (!obj_bsssec(abfd)->user_set_vma)
obj_bsssec(abfd)->vma = (obj_datasec(abfd)->vma
+ obj_datasec(abfd)->size);
/* If the BSS immediately follows the data section and extra space
in the page is left after the data section, fudge data
in the header so that the bss section looks smaller by that
amount. We'll start the bss section there, and lie to the OS.
(Note that a linker script, as well as the above assignment,
could have explicitly set the BSS vma to immediately follow
the data section.) */
if (align_power (obj_bsssec(abfd)->vma, obj_bsssec(abfd)->alignment_power)
== obj_datasec(abfd)->vma + obj_datasec(abfd)->size)
execp->a_bss = (data_pad > obj_bsssec(abfd)->size) ? 0 :
obj_bsssec(abfd)->size - data_pad;
else
execp->a_bss = obj_bsssec(abfd)->size;
}
static void
adjust_n_magic (bfd *abfd, struct internal_exec *execp)
{
file_ptr pos = adata(abfd).exec_bytes_size;
bfd_vma vma = 0;
int pad;
/* Text. */
obj_textsec(abfd)->filepos = pos;
if (!obj_textsec(abfd)->user_set_vma)
obj_textsec(abfd)->vma = vma;
else
vma = obj_textsec(abfd)->vma;
pos += obj_textsec(abfd)->size;
vma += obj_textsec(abfd)->size;
/* Data. */
obj_datasec(abfd)->filepos = pos;
if (!obj_datasec(abfd)->user_set_vma)
obj_datasec(abfd)->vma = BFD_ALIGN (vma, adata(abfd).segment_size);
vma = obj_datasec(abfd)->vma;
/* Since BSS follows data immediately, see if it needs alignment. */
vma += obj_datasec(abfd)->size;
pad = align_power (vma, obj_bsssec(abfd)->alignment_power) - vma;
obj_datasec(abfd)->size += pad;
pos += obj_datasec(abfd)->size;
/* BSS. */
if (!obj_bsssec(abfd)->user_set_vma)
obj_bsssec(abfd)->vma = vma;
else
vma = obj_bsssec(abfd)->vma;
/* Fix up exec header. */
execp->a_text = obj_textsec(abfd)->size;
execp->a_data = obj_datasec(abfd)->size;
execp->a_bss = obj_bsssec(abfd)->size;
N_SET_MAGIC (*execp, NMAGIC);
}
bfd_boolean
NAME (aout, adjust_sizes_and_vmas) (bfd *abfd,
bfd_size_type *text_size,
file_ptr * text_end ATTRIBUTE_UNUSED)
{
struct internal_exec *execp = exec_hdr (abfd);
if (! NAME (aout, make_sections) (abfd))
return FALSE;
if (adata(abfd).magic != undecided_magic)
return TRUE;
obj_textsec(abfd)->size =
align_power(obj_textsec(abfd)->size,
obj_textsec(abfd)->alignment_power);
*text_size = obj_textsec (abfd)->size;
/* Rule (heuristic) for when to pad to a new page. Note that there
are (at least) two ways demand-paged (ZMAGIC) files have been
handled. Most Berkeley-based systems start the text segment at
(TARGET_PAGE_SIZE). However, newer versions of SUNOS start the text
segment right after the exec header; the latter is counted in the
text segment size, and is paged in by the kernel with the rest of
the text. */
/* This perhaps isn't the right way to do this, but made it simpler for me
to understand enough to implement it. Better would probably be to go
right from BFD flags to alignment/positioning characteristics. But the
old code was sloppy enough about handling the flags, and had enough
other magic, that it was a little hard for me to understand. I think
I understand it better now, but I haven't time to do the cleanup this
minute. */
if (abfd->flags & WP_TEXT)
adata(abfd).magic = n_magic;
else
adata(abfd).magic = o_magic;
#ifdef BFD_AOUT_DEBUG /* requires gcc2 */
#if __GNUC__ >= 2
fprintf (stderr, "%s text=<%x,%x,%x> data=<%x,%x,%x> bss=<%x,%x,%x>\n",
({ char *str;
switch (adata(abfd).magic) {
case n_magic: str = "NMAGIC"; break;
case o_magic: str = "OMAGIC"; break;
case z_magic: str = "ZMAGIC"; break;
default: abort ();
}
str;
}),
obj_textsec(abfd)->vma, obj_textsec(abfd)->size,
obj_textsec(abfd)->alignment_power,
obj_datasec(abfd)->vma, obj_datasec(abfd)->size,
obj_datasec(abfd)->alignment_power,
obj_bsssec(abfd)->vma, obj_bsssec(abfd)->size,
obj_bsssec(abfd)->alignment_power);
#endif
#endif
switch (adata(abfd).magic)
{
case o_magic:
adjust_o_magic (abfd, execp);
break;
case z_magic:
adjust_z_magic (abfd, execp);
break;
case n_magic:
adjust_n_magic (abfd, execp);
break;
default:
abort ();
}
#ifdef BFD_AOUT_DEBUG
fprintf (stderr, " text=<%x,%x,%x> data=<%x,%x,%x> bss=<%x,%x>\n",
obj_textsec(abfd)->vma, obj_textsec(abfd)->size,
obj_textsec(abfd)->filepos,
obj_datasec(abfd)->vma, obj_datasec(abfd)->size,
obj_datasec(abfd)->filepos,
obj_bsssec(abfd)->vma, obj_bsssec(abfd)->size);
#endif
return TRUE;
}
/* Called by the BFD in response to a bfd_make_section request. */
bfd_boolean
NAME (aout, new_section_hook) (bfd *abfd, asection *newsect)
{
/* Align to double at least. */
newsect->alignment_power = bfd_get_arch_info(abfd)->section_align_power;
if (bfd_get_format (abfd) == bfd_object)
{
if (obj_textsec (abfd) == NULL
&& !strcmp (newsect->name, ".text"))
{
obj_textsec(abfd)= newsect;
newsect->target_index = N_TEXT;
}
else if (obj_datasec (abfd) == NULL
&& !strcmp (newsect->name, ".data"))
{
obj_datasec (abfd) = newsect;
newsect->target_index = N_DATA;
}
else if (obj_bsssec (abfd) == NULL
&& !strcmp (newsect->name, ".bss"))
{
obj_bsssec (abfd) = newsect;
newsect->target_index = N_BSS;
}
}
/* We allow more than three sections internally. */
return _bfd_generic_new_section_hook (abfd, newsect);
}
bfd_boolean
NAME (aout, set_section_contents) (bfd *abfd,
sec_ptr section,
const void * location,
file_ptr offset,
bfd_size_type count)
{
file_ptr text_end;
bfd_size_type text_size;
if (! abfd->output_has_begun)
{
if (! NAME (aout, adjust_sizes_and_vmas) (abfd, & text_size, & text_end))
return FALSE;
}
if (section == obj_bsssec (abfd))
{
bfd_set_error (bfd_error_no_contents);
return FALSE;
}
if (section != obj_textsec (abfd)
&& section != obj_datasec (abfd))
{
(*_bfd_error_handler)
("%s: can not represent section `%s' in a.out object file format",
bfd_get_filename (abfd), bfd_get_section_name (abfd, section));
bfd_set_error (bfd_error_nonrepresentable_section);
return FALSE;
}
if (count != 0)
{
if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
|| bfd_bwrite (location, count, abfd) != count)
return FALSE;
}
return TRUE;
}
/* Read the external symbols from an a.out file. */
static bfd_boolean
aout_get_external_symbols (bfd *abfd)
{
if (obj_aout_external_syms (abfd) == NULL)
{
bfd_size_type count;
struct external_nlist *syms;
count = exec_hdr (abfd)->a_syms / EXTERNAL_NLIST_SIZE;
/* PR 17512: file: 011f5a08. */
if (count == 0)
return FALSE;
#ifdef USE_MMAP
if (! bfd_get_file_window (abfd, obj_sym_filepos (abfd),
exec_hdr (abfd)->a_syms,
&obj_aout_sym_window (abfd), TRUE))
return FALSE;
syms = (struct external_nlist *) obj_aout_sym_window (abfd).data;
#else
/* We allocate using malloc to make the values easy to free
later on. If we put them on the objalloc it might not be
possible to free them. */
syms = bfd_malloc (count * EXTERNAL_NLIST_SIZE);
if (syms == NULL && count != 0)
return FALSE;
if (bfd_seek (abfd, obj_sym_filepos (abfd), SEEK_SET) != 0
|| (bfd_bread (syms, exec_hdr (abfd)->a_syms, abfd)
!= exec_hdr (abfd)->a_syms))
{
free (syms);
return FALSE;
}
#endif
obj_aout_external_syms (abfd) = syms;
obj_aout_external_sym_count (abfd) = count;
}
if (obj_aout_external_strings (abfd) == NULL
&& exec_hdr (abfd)->a_syms != 0)
{
unsigned char string_chars[BYTES_IN_LONG];
bfd_size_type stringsize;
char *strings;
/* Get the size of the strings. */
if (bfd_seek (abfd, obj_str_filepos (abfd), SEEK_SET) != 0
|| (bfd_bread ((void *) string_chars, (bfd_size_type) BYTES_IN_LONG,
abfd) != BYTES_IN_LONG))
return FALSE;
stringsize = H_GET_32 (abfd, string_chars);
#ifdef USE_MMAP
if (! bfd_get_file_window (abfd, obj_str_filepos (abfd), stringsize,
&obj_aout_string_window (abfd), TRUE))
return FALSE;
strings = (char *) obj_aout_string_window (abfd).data;
#else
strings = bfd_malloc (stringsize + 1);
if (strings == NULL)
return FALSE;
/* Skip space for the string count in the buffer for convenience
when using indexes. */
if (bfd_bread (strings + 4, stringsize - 4, abfd) != stringsize - 4)
{
free (strings);
return FALSE;
}
#endif
/* Ensure that a zero index yields an empty string. */
strings[0] = '\0';
strings[stringsize - 1] = 0;
obj_aout_external_strings (abfd) = strings;
obj_aout_external_string_size (abfd) = stringsize;
}
return TRUE;
}
/* Translate an a.out symbol into a BFD symbol. The desc, other, type
and symbol->value fields of CACHE_PTR will be set from the a.out
nlist structure. This function is responsible for setting
symbol->flags and symbol->section, and adjusting symbol->value. */
static bfd_boolean
translate_from_native_sym_flags (bfd *abfd,
aout_symbol_type *cache_ptr)
{
flagword visible;
if (cache_ptr->type == N_FN)
{
asection *sec;
/* This is a debugging symbol. */
cache_ptr->symbol.flags = BSF_DEBUGGING;
/* Work out the symbol section. */
switch (cache_ptr->type & N_TYPE)
{
case N_TEXT:
case N_FN:
sec = obj_textsec (abfd);
break;
case N_DATA:
sec = obj_datasec (abfd);
break;
case N_BSS:
sec = obj_bsssec (abfd);
break;
default:
case N_ABS:
sec = bfd_abs_section_ptr;
break;
}
cache_ptr->symbol.section = sec;
cache_ptr->symbol.value -= sec->vma;
return TRUE;
}
/* Get the default visibility. This does not apply to all types, so
we just hold it in a local variable to use if wanted. */
if ((cache_ptr->type & N_EXT) == 0)
visible = BSF_LOCAL;
else
visible = BSF_GLOBAL;
switch (cache_ptr->type)
{
default:
case N_ABS: case N_ABS | N_EXT:
cache_ptr->symbol.section = bfd_abs_section_ptr;
cache_ptr->symbol.flags = visible;
break;
case N_UNDF | N_EXT:
if (cache_ptr->symbol.value != 0)
{
/* This is a common symbol. */
cache_ptr->symbol.flags = BSF_GLOBAL;
cache_ptr->symbol.section = bfd_com_section_ptr;
}
else
{
cache_ptr->symbol.flags = 0;
cache_ptr->symbol.section = bfd_und_section_ptr;
}
break;
case N_TEXT: case N_TEXT | N_EXT:
cache_ptr->symbol.section = obj_textsec (abfd);
cache_ptr->symbol.value -= cache_ptr->symbol.section->vma;
cache_ptr->symbol.flags = visible;
break;
case N_DATA: case N_DATA | N_EXT:
cache_ptr->symbol.section = obj_datasec (abfd);
cache_ptr->symbol.value -= cache_ptr->symbol.section->vma;
cache_ptr->symbol.flags = visible;
break;
case N_BSS: case N_BSS | N_EXT:
cache_ptr->symbol.section = obj_bsssec (abfd);
cache_ptr->symbol.value -= cache_ptr->symbol.section->vma;
cache_ptr->symbol.flags = visible;
break;
}
return TRUE;
}
/* Set the fields of SYM_POINTER according to CACHE_PTR. */
static bfd_boolean
translate_to_native_sym_flags (bfd *abfd,
asymbol *cache_ptr,
struct external_nlist *sym_pointer)
{
bfd_vma value = cache_ptr->value;
asection *sec;
bfd_vma off;
/* Mask out any existing type bits in case copying from one section
to another. */
sym_pointer->e_type[0] &= ~N_TYPE;
sec = bfd_get_section (cache_ptr);
off = 0;
if (sec == NULL)
{
/* This case occurs, e.g., for the *DEBUG* section of a COFF
file. */
(*_bfd_error_handler)
("%B: can not represent section for symbol `%s' in a.out object file format",
abfd, cache_ptr->name != NULL ? cache_ptr->name : "*unknown*");
bfd_set_error (bfd_error_nonrepresentable_section);
return FALSE;
}
if (sec->output_section != NULL)
{
off = sec->output_offset;
sec = sec->output_section;
}
if (bfd_is_abs_section (sec))
sym_pointer->e_type[0] |= N_ABS;
else if (sec == obj_textsec (abfd))
sym_pointer->e_type[0] |= N_TEXT;
else if (sec == obj_datasec (abfd))
sym_pointer->e_type[0] |= N_DATA;
else if (sec == obj_bsssec (abfd))
sym_pointer->e_type[0] |= N_BSS;
else if (bfd_is_und_section (sec))
sym_pointer->e_type[0] = N_UNDF | N_EXT;
else if (bfd_is_com_section (sec))
sym_pointer->e_type[0] = N_UNDF | N_EXT;
else
{
(*_bfd_error_handler)
("%B: can not represent section `%A' in a.out object file format",
abfd, sec);
bfd_set_error (bfd_error_nonrepresentable_section);
return FALSE;
}
/* Turn the symbol from section relative to absolute again */
value += sec->vma + off;
if ((cache_ptr->flags & BSF_DEBUGGING) != 0)
sym_pointer->e_type[0] = ((aout_symbol_type *) cache_ptr)->type;
else if ((cache_ptr->flags & BSF_GLOBAL) != 0)
sym_pointer->e_type[0] |= N_EXT;
PUT_WORD(abfd, value, sym_pointer->e_value);
return TRUE;
}
/* Native-level interface to symbols. */
asymbol *
NAME (aout, make_empty_symbol) (bfd *abfd)
{
bfd_size_type amt = sizeof (aout_symbol_type);
aout_symbol_type *new_symbol_type = bfd_zalloc (abfd, amt);
if (!new_symbol_type)
return NULL;
new_symbol_type->symbol.the_bfd = abfd;
return &new_symbol_type->symbol;
}
/* Translate a set of internal symbols into external symbols. */
bfd_boolean
NAME (aout, translate_symbol_table) (bfd *abfd,
aout_symbol_type *in,
struct external_nlist *ext,
bfd_size_type count,
char *str,
bfd_size_type strsize,
bfd_boolean dynamic)
{
struct external_nlist *ext_end;
ext_end = ext + count;
for (; ext < ext_end; ext++, in++)
{
bfd_vma x;
x = GET_WORD (abfd, ext->e_strx);
in->symbol.the_bfd = abfd;
/* For the normal symbols, the zero index points at the number
of bytes in the string table but is to be interpreted as the
null string. For the dynamic symbols, the number of bytes in
the string table is stored in the __DYNAMIC structure and the
zero index points at an actual string. */
if (x == 0 && ! dynamic)
in->symbol.name = "";
else if (x < strsize)
in->symbol.name = str + x;
else
return FALSE;
in->symbol.value = GET_SWORD (abfd, ext->e_value);
/* TODO: is 0 a safe value here? */
in->desc = 0;
in->other = 0;
in->type = H_GET_8 (abfd, ext->e_type);
in->symbol.udata.p = NULL;
if (! translate_from_native_sym_flags (abfd, in))
return FALSE;
if (dynamic)
in->symbol.flags |= BSF_DYNAMIC;
}
return TRUE;
}
/* We read the symbols into a buffer, which is discarded when this
function exits. We read the strings into a buffer large enough to
hold them all plus all the cached symbol entries. */
bfd_boolean
NAME (aout, slurp_symbol_table) (bfd *abfd)
{
struct external_nlist *old_external_syms;
aout_symbol_type *cached;
bfd_size_type cached_size;
/* If there's no work to be done, don't do any. */
if (obj_aout_symbols (abfd) != NULL)
return TRUE;
old_external_syms = obj_aout_external_syms (abfd);
if (! aout_get_external_symbols (abfd))
return FALSE;
cached_size = obj_aout_external_sym_count (abfd);
cached_size *= sizeof (aout_symbol_type);
cached = bfd_zmalloc (cached_size);
if (cached == NULL && cached_size != 0)
return FALSE;
/* Convert from external symbol information to internal. */
if (! (NAME (aout, translate_symbol_table)
(abfd, cached,
obj_aout_external_syms (abfd),
obj_aout_external_sym_count (abfd),
obj_aout_external_strings (abfd),
obj_aout_external_string_size (abfd),
FALSE)))
{
free (cached);
return FALSE;
}
bfd_get_symcount (abfd) = obj_aout_external_sym_count (abfd);
obj_aout_symbols (abfd) = cached;
/* It is very likely that anybody who calls this function will not
want the external symbol information, so if it was allocated
because of our call to aout_get_external_symbols, we free it up
right away to save space. */
if (old_external_syms == NULL
&& obj_aout_external_syms (abfd) != NULL)
{
#ifdef USE_MMAP
bfd_free_window (&obj_aout_sym_window (abfd));
#else
free (obj_aout_external_syms (abfd));
#endif
obj_aout_external_syms (abfd) = NULL;
}
return TRUE;
}
/* We use a hash table when writing out symbols so that we only write
out a particular string once. This helps particularly when the
linker writes out stabs debugging entries, because each different
contributing object file tends to have many duplicate stabs
strings.
This hash table code breaks dbx on SunOS 4.1.3, so we don't do it
if BFD_TRADITIONAL_FORMAT is set. */
/* Get the index of a string in a strtab, adding it if it is not
already present. */
static INLINE bfd_size_type
add_to_stringtab (bfd *abfd,
struct bfd_strtab_hash *tab,
const char *str,
bfd_boolean copy)
{
bfd_boolean hash;
bfd_size_type str_index;
/* An index of 0 always means the empty string. */
if (str == 0 || *str == '\0')
return 0;
/* Don't hash if BFD_TRADITIONAL_FORMAT is set, because SunOS dbx
doesn't understand a hashed string table. */
hash = TRUE;
if ((abfd->flags & BFD_TRADITIONAL_FORMAT) != 0)
hash = FALSE;
str_index = _bfd_stringtab_add (tab, str, hash, copy);
if (str_index != (bfd_size_type) -1)
/* Add BYTES_IN_LONG to the return value to account for the
space taken up by the string table size. */
str_index += BYTES_IN_LONG;
return str_index;
}
/* Write out a strtab. ABFD is already at the right location in the
file. */
static bfd_boolean
emit_stringtab (bfd *abfd, struct bfd_strtab_hash *tab)
{
bfd_byte buffer[BYTES_IN_LONG];
/* The string table starts with the size. */
H_PUT_32 (abfd, _bfd_stringtab_size (tab) + BYTES_IN_LONG, buffer);
if (bfd_bwrite ((void *) buffer, (bfd_size_type) BYTES_IN_LONG, abfd)
!= BYTES_IN_LONG)
return FALSE;
return _bfd_stringtab_emit (abfd, tab);
}
bfd_boolean
NAME (aout, write_syms) (bfd *abfd)
{
unsigned int count ;
asymbol **generic = bfd_get_outsymbols (abfd);
struct bfd_strtab_hash *strtab;
strtab = _bfd_stringtab_init ();
if (strtab == NULL)
return FALSE;
for (count = 0; count < bfd_get_symcount (abfd); count++)
{
asymbol *g = generic[count];
bfd_size_type indx;
struct external_nlist nsp;
PUT_WORD (abfd, 0, nsp.e_unused);
indx = add_to_stringtab (abfd, strtab, g->name, FALSE);
if (indx == (bfd_size_type) -1)
goto error_return;
PUT_WORD (abfd, indx, nsp.e_strx);
if (bfd_asymbol_flavour(g) == abfd->xvec->flavour)
H_PUT_8 (abfd, aout_symbol(g)->type, nsp.e_type);
else
H_PUT_8 (abfd, 0, nsp.e_type);
if (! translate_to_native_sym_flags (abfd, g, &nsp))
goto error_return;
H_PUT_8 (abfd, 0, nsp.e_ovly);
if (bfd_bwrite ((void *)&nsp, (bfd_size_type) EXTERNAL_NLIST_SIZE, abfd)
!= EXTERNAL_NLIST_SIZE)
goto error_return;
/* NB: `KEEPIT' currently overlays `udata.p', so set this only
here, at the end. */
g->KEEPIT = count;
}
if (! emit_stringtab (abfd, strtab))
goto error_return;
_bfd_stringtab_free (strtab);
return TRUE;
error_return:
_bfd_stringtab_free (strtab);
return FALSE;
}
long
NAME (aout, canonicalize_symtab) (bfd *abfd, asymbol **location)
{
unsigned int counter = 0;
aout_symbol_type *symbase;
if (!NAME (aout, slurp_symbol_table) (abfd))
return -1;
for (symbase = obj_aout_symbols (abfd); counter++ < bfd_get_symcount (abfd);)
*(location++) = (asymbol *)(symbase++);
*location++ =0;
return bfd_get_symcount (abfd);
}
/* Output extended relocation information to a file in target byte order. */
static void
pdp11_aout_swap_reloc_out (bfd *abfd, arelent *g, bfd_byte *natptr)
{
int r_index;
int r_pcrel;
int reloc_entry;
int r_type;
asymbol *sym = *(g->sym_ptr_ptr);
asection *output_section = sym->section->output_section;
if (g->addend != 0)
fprintf (stderr, "BFD: can't do this reloc addend stuff\n");
r_pcrel = g->howto->pc_relative;
if (bfd_is_abs_section (output_section))
r_type = RABS;
else if (output_section == obj_textsec (abfd))
r_type = RTEXT;
else if (output_section == obj_datasec (abfd))
r_type = RDATA;
else if (output_section == obj_bsssec (abfd))
r_type = RBSS;
else if (bfd_is_und_section (output_section))
r_type = REXT;
else if (bfd_is_com_section (output_section))
r_type = REXT;
else
r_type = -1;
BFD_ASSERT (r_type != -1);
if (r_type == RABS)
r_index = 0;
else
r_index = (*(g->sym_ptr_ptr))->KEEPIT;
reloc_entry = r_index << 4 | r_type | r_pcrel;
PUT_WORD (abfd, reloc_entry, natptr);
}
/* 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
pdp11_aout_swap_reloc_in (bfd * abfd,
bfd_byte * bytes,
arelent * cache_ptr,
bfd_size_type offset,
asymbol ** symbols,
bfd_size_type symcount)
{
struct aoutdata *su = &(abfd->tdata.aout_data->a);
unsigned int r_index;
int reloc_entry;
int r_extern;
int r_pcrel;
reloc_entry = GET_WORD (abfd, (void *) bytes);
r_pcrel = reloc_entry & RELFLG;
cache_ptr->address = offset;
cache_ptr->howto = howto_table_pdp11 + (r_pcrel ? 1 : 0);
if ((reloc_entry & RTYPE) == RABS)
r_index = N_ABS;
else
r_index = RINDEX (reloc_entry);
/* r_extern reflects whether the symbol the reloc is against is
local or global. */
r_extern = (reloc_entry & RTYPE) == REXT;
if (r_extern && r_index > symcount)
{
/* We could arrange to return an error, but it might be useful
to see the file even if it is bad. */
r_extern = 0;
r_index = N_ABS;
}
MOVE_ADDRESS(0);
}
/* Read and swap the relocs for a section. */
bfd_boolean
NAME (aout, slurp_reloc_table) (bfd *abfd, sec_ptr asect, asymbol **symbols)
{
bfd_byte *rptr;
bfd_size_type count;
bfd_size_type reloc_size;
void * relocs;
arelent *reloc_cache;
size_t each_size;
unsigned int counter = 0;
arelent *cache_ptr;
if (asect->relocation)
return TRUE;
if (asect->flags & SEC_CONSTRUCTOR)
return TRUE;
if (asect == obj_datasec (abfd))
reloc_size = exec_hdr(abfd)->a_drsize;
else if (asect == obj_textsec (abfd))
reloc_size = exec_hdr(abfd)->a_trsize;
else if (asect == obj_bsssec (abfd))
reloc_size = 0;
else
{
bfd_set_error (bfd_error_invalid_operation);
return FALSE;
}
if (bfd_seek (abfd, asect->rel_filepos, SEEK_SET) != 0)
return FALSE;
each_size = obj_reloc_entry_size (abfd);
relocs = bfd_malloc (reloc_size);
if (relocs == NULL && reloc_size != 0)
return FALSE;
if (bfd_bread (relocs, reloc_size, abfd) != reloc_size)
{
free (relocs);
return FALSE;
}
count = reloc_size / each_size;
/* Count the number of NON-ZERO relocs, this is the count we want. */
{
unsigned int real_count = 0;
for (counter = 0; counter < count; counter++)
{
int x;
x = GET_WORD (abfd, (char *) relocs + each_size * counter);
if (x != 0)
real_count++;
}
count = real_count;
}
reloc_cache = bfd_zmalloc (count * sizeof (arelent));
if (reloc_cache == NULL && count != 0)
return FALSE;
cache_ptr = reloc_cache;
rptr = relocs;
for (counter = 0;
counter < count;
counter++, rptr += RELOC_SIZE, cache_ptr++)
{
while (GET_WORD (abfd, (void *) rptr) == 0)
{
rptr += RELOC_SIZE;
if ((char *) rptr >= (char *) relocs + reloc_size)
goto done;
}
pdp11_aout_swap_reloc_in (abfd, rptr, cache_ptr,
(bfd_size_type) ((char *) rptr - (char *) relocs),
symbols,
(bfd_size_type) bfd_get_symcount (abfd));
}
done:
/* Just in case, if rptr >= relocs + reloc_size should happen
too early. */
BFD_ASSERT (counter == count);
free (relocs);
asect->relocation = reloc_cache;
asect->reloc_count = cache_ptr - reloc_cache;
return TRUE;
}
/* Write out a relocation section into an object file. */
bfd_boolean
NAME (aout, squirt_out_relocs) (bfd *abfd, asection *section)
{
arelent **generic;
unsigned char *native;
unsigned int count = section->reloc_count;
bfd_size_type natsize;
natsize = section->size;
native = bfd_zalloc (abfd, natsize);
if (!native)
return FALSE;
generic = section->orelocation;
if (generic != NULL)
{
while (count > 0)
{
bfd_byte *r;
r = native + (*generic)->address;
pdp11_aout_swap_reloc_out (abfd, *generic, r);
count--;
generic++;
}
}
if (bfd_bwrite ((void *) 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. */
long
NAME (aout, canonicalize_reloc) (bfd *abfd,
sec_ptr section,
arelent **relptr,
asymbol **symbols)
{
arelent *tblptr = section->relocation;
unsigned int count;
if (section == obj_bsssec (abfd))
{
*relptr = NULL;
return 0;
}
if (!(tblptr || NAME (aout, 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;
}
long
NAME (aout, get_reloc_upper_bound) (bfd *abfd, sec_ptr asect)
{
if (bfd_get_format (abfd) != bfd_object)
{
bfd_set_error (bfd_error_invalid_operation);
return -1;
}
if (asect->flags & SEC_CONSTRUCTOR)
return (sizeof (arelent *) * (asect->reloc_count + 1));
if (asect == obj_datasec (abfd))
return (sizeof (arelent *)
* ((exec_hdr (abfd)->a_drsize / obj_reloc_entry_size (abfd))
+ 1));
if (asect == obj_textsec (abfd))
return (sizeof (arelent *)
* ((exec_hdr (abfd)->a_trsize / obj_reloc_entry_size (abfd))
+ 1));
/* TODO: why are there two if statements for obj_bsssec()? */
if (asect == obj_bsssec (abfd))
return sizeof (arelent *);
if (asect == obj_bsssec (abfd))
return 0;
bfd_set_error (bfd_error_invalid_operation);
return -1;
}
long
NAME (aout, get_symtab_upper_bound) (bfd *abfd)
{
if (!NAME (aout, slurp_symbol_table) (abfd))
return -1;
return (bfd_get_symcount (abfd) + 1) * (sizeof (aout_symbol_type *));
}
alent *
NAME (aout, get_lineno) (bfd * abfd ATTRIBUTE_UNUSED,
asymbol * symbol ATTRIBUTE_UNUSED)
{
return NULL;
}
void
NAME (aout, get_symbol_info) (bfd * abfd ATTRIBUTE_UNUSED,
asymbol *symbol,
symbol_info *ret)
{
bfd_symbol_info (symbol, ret);
if (ret->type == '?')
{
int type_code = aout_symbol(symbol)->type & 0xff;
const char *stab_name = bfd_get_stab_name (type_code);
static char buf[10];
if (stab_name == NULL)
{
sprintf(buf, "(%d)", type_code);
stab_name = buf;
}
ret->type = '-';
ret->stab_type = type_code;
ret->stab_other = (unsigned) (aout_symbol(symbol)->other & 0xff);
ret->stab_desc = (unsigned) (aout_symbol(symbol)->desc & 0xffff);
ret->stab_name = stab_name;
}
}
void
NAME (aout, print_symbol) (bfd * abfd,
void * afile,
asymbol *symbol,
bfd_print_symbol_type how)
{
FILE *file = (FILE *) afile;
switch (how)
{
case bfd_print_symbol_name:
if (symbol->name)
fprintf(file,"%s", symbol->name);
break;
case bfd_print_symbol_more:
fprintf(file,"%4x %2x %2x",
(unsigned) (aout_symbol (symbol)->desc & 0xffff),
(unsigned) (aout_symbol (symbol)->other & 0xff),
(unsigned) (aout_symbol (symbol)->type));
break;
case bfd_print_symbol_all:
{
const char *section_name = symbol->section->name;
bfd_print_symbol_vandf (abfd, (void *) file, symbol);
fprintf (file," %-5s %04x %02x %02x",
section_name,
(unsigned) (aout_symbol (symbol)->desc & 0xffff),
(unsigned) (aout_symbol (symbol)->other & 0xff),
(unsigned) (aout_symbol (symbol)->type & 0xff));
if (symbol->name)
fprintf(file," %s", symbol->name);
}
break;
}
}
/* If we don't have to allocate more than 1MB to hold the generic
symbols, we use the generic minisymbol method: it's faster, since
it only translates the symbols once, not multiple times. */
#define MINISYM_THRESHOLD (1000000 / sizeof (asymbol))
/* Read minisymbols. For minisymbols, we use the unmodified a.out
symbols. The minisymbol_to_symbol function translates these into
BFD asymbol structures. */
long
NAME (aout, read_minisymbols) (bfd *abfd,
bfd_boolean dynamic,
void * *minisymsp,
unsigned int *sizep)
{
if (dynamic)
/* We could handle the dynamic symbols here as well, but it's
easier to hand them off. */
return _bfd_generic_read_minisymbols (abfd, dynamic, minisymsp, sizep);
if (! aout_get_external_symbols (abfd))
return -1;
if (obj_aout_external_sym_count (abfd) < MINISYM_THRESHOLD)
return _bfd_generic_read_minisymbols (abfd, dynamic, minisymsp, sizep);
*minisymsp = (void *) obj_aout_external_syms (abfd);
/* By passing the external symbols back from this routine, we are
giving up control over the memory block. Clear
obj_aout_external_syms, so that we do not try to free it
ourselves. */
obj_aout_external_syms (abfd) = NULL;
*sizep = EXTERNAL_NLIST_SIZE;
return obj_aout_external_sym_count (abfd);
}
/* Convert a minisymbol to a BFD asymbol. A minisymbol is just an
unmodified a.out symbol. The SYM argument is a structure returned
by bfd_make_empty_symbol, which we fill in here. */
asymbol *
NAME (aout, minisymbol_to_symbol) (bfd *abfd,
bfd_boolean dynamic,
const void * minisym,
asymbol *sym)
{
if (dynamic
|| obj_aout_external_sym_count (abfd) < MINISYM_THRESHOLD)
return _bfd_generic_minisymbol_to_symbol (abfd, dynamic, minisym, sym);
memset (sym, 0, sizeof (aout_symbol_type));
/* We call translate_symbol_table to translate a single symbol. */
if (! (NAME (aout, translate_symbol_table)
(abfd,
(aout_symbol_type *) sym,
(struct external_nlist *) minisym,
(bfd_size_type) 1,
obj_aout_external_strings (abfd),
obj_aout_external_string_size (abfd),
FALSE)))
return NULL;
return sym;
}
/* Provided a BFD, a section and an offset into the section, calculate
and return the name of the source file and the line nearest to the
wanted location. */
bfd_boolean
NAME (aout, find_nearest_line) (bfd *abfd,
asymbol **symbols,
asection *section,
bfd_vma offset,
const char **filename_ptr,
const char **functionname_ptr,
unsigned int *line_ptr,
unsigned int *discriminator_ptr)
{
/* Run down the file looking for the filename, function and linenumber. */
asymbol **p;
const char *directory_name = NULL;
const char *main_file_name = NULL;
const char *current_file_name = NULL;
const char *line_file_name = NULL; /* Value of current_file_name at line number. */
bfd_vma low_line_vma = 0;
bfd_vma low_func_vma = 0;
asymbol *func = 0;
size_t filelen, funclen;
char *buf;
*filename_ptr = abfd->filename;
*functionname_ptr = 0;
*line_ptr = 0;
if (discriminator_ptr)
*discriminator_ptr = 0;
if (symbols != NULL)
{
for (p = symbols; *p; p++)
{
aout_symbol_type *q = (aout_symbol_type *)(*p);
next:
switch (q->type)
{
case N_TEXT:
/* If this looks like a file name symbol, and it comes after
the line number we have found so far, but before the
offset, then we have probably not found the right line
number. */
if (q->symbol.value <= offset
&& ((q->symbol.value > low_line_vma
&& (line_file_name != NULL
|| *line_ptr != 0))
|| (q->symbol.value > low_func_vma
&& func != NULL)))
{
const char * symname;
symname = q->symbol.name;
if (strcmp (symname + strlen (symname) - 2, ".o") == 0)
{
if (q->symbol.value > low_line_vma)
{
*line_ptr = 0;
line_file_name = NULL;
}
if (q->symbol.value > low_func_vma)
func = NULL;
}
}
break;
case N_SO:
/* If this symbol is less than the offset, but greater than
the line number we have found so far, then we have not
found the right line number. */
if (q->symbol.value <= offset)
{
if (q->symbol.value > low_line_vma)
{
*line_ptr = 0;
line_file_name = NULL;
}
if (q->symbol.value > low_func_vma)
func = NULL;
}
main_file_name = current_file_name = q->symbol.name;
/* Look ahead to next symbol to check if that too is an N_SO. */
p++;
if (*p == NULL)
break;
q = (aout_symbol_type *)(*p);
if (q->type != (int) N_SO)
goto next;
/* Found a second N_SO First is directory; second is filename. */
directory_name = current_file_name;
main_file_name = current_file_name = q->symbol.name;
if (obj_textsec(abfd) != section)
goto done;
break;
case N_SOL:
current_file_name = q->symbol.name;
break;
case N_SLINE:
case N_DSLINE:
case N_BSLINE:
/* We'll keep this if it resolves nearer than the one we have
already. */
if (q->symbol.value >= low_line_vma
&& q->symbol.value <= offset)
{
*line_ptr = q->desc;
low_line_vma = q->symbol.value;
line_file_name = current_file_name;
}
break;
case N_FUN:
{
/* We'll keep this if it is nearer than the one we have already. */
if (q->symbol.value >= low_func_vma &&
q->symbol.value <= offset)
{
low_func_vma = q->symbol.value;
func = (asymbol *) q;
}
else if (q->symbol.value > offset)
goto done;
}
break;
}
}
}
done:
if (*line_ptr != 0)
main_file_name = line_file_name;
if (main_file_name == NULL
|| main_file_name[0] == '/'
|| directory_name == NULL)
filelen = 0;
else
filelen = strlen (directory_name) + strlen (main_file_name);
if (func == NULL)
funclen = 0;
else
funclen = strlen (bfd_asymbol_name (func));
if (adata (abfd).line_buf != NULL)
free (adata (abfd).line_buf);
if (filelen + funclen == 0)
adata (abfd).line_buf = buf = NULL;
else
{
buf = bfd_malloc ((bfd_size_type) filelen + funclen + 3);
adata (abfd).line_buf = buf;
if (buf == NULL)
return FALSE;
}
if (main_file_name != NULL)
{
if (main_file_name[0] == '/' || directory_name == NULL)
*filename_ptr = main_file_name;
else
{
sprintf (buf, "%s%s", directory_name, main_file_name);
*filename_ptr = buf;
buf += filelen + 1;
}
}
if (func)
{
const char *function = func->name;
char *colon;
/* The caller expects a symbol name. We actually have a
function name, without the leading underscore. Put the
underscore back in, so that the caller gets a symbol name. */
if (bfd_get_symbol_leading_char (abfd) == '\0')
strcpy (buf, function);
else
{
buf[0] = bfd_get_symbol_leading_char (abfd);
strcpy (buf + 1, function);
}
/* Have to remove : stuff. */
colon = strchr (buf, ':');
if (colon != NULL)
*colon = '\0';
*functionname_ptr = buf;
}
return TRUE;
}
int
NAME (aout, sizeof_headers) (bfd *abfd,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
return adata (abfd).exec_bytes_size;
}
/* Free all information we have cached for this BFD. We can always
read it again later if we need it. */
bfd_boolean
NAME (aout, bfd_free_cached_info) (bfd *abfd)
{
asection *o;
if (bfd_get_format (abfd) != bfd_object)
return TRUE;
#define BFCI_FREE(x) if (x != NULL) { free (x); x = NULL; }
BFCI_FREE (obj_aout_symbols (abfd));
#ifdef USE_MMAP
obj_aout_external_syms (abfd) = 0;
bfd_free_window (&obj_aout_sym_window (abfd));
bfd_free_window (&obj_aout_string_window (abfd));
obj_aout_external_strings (abfd) = 0;
#else
BFCI_FREE (obj_aout_external_syms (abfd));
BFCI_FREE (obj_aout_external_strings (abfd));
#endif
for (o = abfd->sections; o != NULL; o = o->next)
BFCI_FREE (o->relocation);
#undef BFCI_FREE
return TRUE;
}
/* Routine to create an entry in an a.out link hash table. */
struct bfd_hash_entry *
NAME (aout, link_hash_newfunc) (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
struct aout_link_hash_entry *ret = (struct aout_link_hash_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == NULL)
ret = bfd_hash_allocate (table, sizeof (* ret));
if (ret == NULL)
return NULL;
/* Call the allocation method of the superclass. */
ret = (struct aout_link_hash_entry *)
_bfd_link_hash_newfunc ((struct bfd_hash_entry *) ret, table, string);
if (ret)
{
/* Set local fields. */
ret->written = FALSE;
ret->indx = -1;
}
return (struct bfd_hash_entry *) ret;
}
/* Initialize an a.out link hash table. */
bfd_boolean
NAME (aout, link_hash_table_init) (struct aout_link_hash_table *table,
bfd *abfd,
struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
struct bfd_hash_table *,
const char *),
unsigned int entsize)
{
return _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
}
/* Create an a.out link hash table. */
struct bfd_link_hash_table *
NAME (aout, link_hash_table_create) (bfd *abfd)
{
struct aout_link_hash_table *ret;
bfd_size_type amt = sizeof (struct aout_link_hash_table);
ret = bfd_malloc (amt);
if (ret == NULL)
return NULL;
if (! NAME (aout, link_hash_table_init) (ret, abfd,
NAME (aout, link_hash_newfunc),
sizeof (struct aout_link_hash_entry)))
{
free (ret);
return NULL;
}
return &ret->root;
}
/* Free up the internal symbols read from an a.out file. */
static bfd_boolean
aout_link_free_symbols (bfd *abfd)
{
if (obj_aout_external_syms (abfd) != NULL)
{
#ifdef USE_MMAP
bfd_free_window (&obj_aout_sym_window (abfd));
#else
free ((void *) obj_aout_external_syms (abfd));
#endif
obj_aout_external_syms (abfd) = NULL;
}
if (obj_aout_external_strings (abfd) != NULL)
{
#ifdef USE_MMAP
bfd_free_window (&obj_aout_string_window (abfd));
#else
free ((void *) obj_aout_external_strings (abfd));
#endif
obj_aout_external_strings (abfd) = NULL;
}
return TRUE;
}
/* Given an a.out BFD, add symbols to the global hash table as
appropriate. */
bfd_boolean
NAME (aout, link_add_symbols) (bfd *abfd, struct bfd_link_info *info)
{
switch (bfd_get_format (abfd))
{
case bfd_object:
return aout_link_add_object_symbols (abfd, info);
case bfd_archive:
return _bfd_generic_link_add_archive_symbols
(abfd, info, aout_link_check_archive_element);
default:
bfd_set_error (bfd_error_wrong_format);
return FALSE;
}
}
/* Add symbols from an a.out object file. */
static bfd_boolean
aout_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
{
if (! aout_get_external_symbols (abfd))
return FALSE;
if (! aout_link_add_symbols (abfd, info))
return FALSE;
if (! info->keep_memory)
{
if (! aout_link_free_symbols (abfd))
return FALSE;
}
return TRUE;
}
/* Look through the internal symbols to see if this object file should
be included in the link. We should include this object file if it
defines any symbols which are currently undefined. If this object
file defines a common symbol, then we may adjust the size of the
known symbol but we do not include the object file in the link
(unless there is some other reason to include it). */
static bfd_boolean
aout_link_check_ar_symbols (bfd *abfd,
struct bfd_link_info *info,
bfd_boolean *pneeded,
bfd **subsbfd)
{
struct external_nlist *p;
struct external_nlist *pend;
char *strings;
*pneeded = FALSE;
/* Look through all the symbols. */
p = obj_aout_external_syms (abfd);
pend = p + obj_aout_external_sym_count (abfd);
strings = obj_aout_external_strings (abfd);
for (; p < pend; p++)
{
int type = H_GET_8 (abfd, p->e_type);
const char *name;
struct bfd_link_hash_entry *h;
/* Ignore symbols that are not externally visible. This is an
optimization only, as we check the type more thoroughly
below. */
if ((type & N_EXT) == 0
|| type == N_FN)
continue;
name = strings + GET_WORD (abfd, p->e_strx);
h = bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, TRUE);
/* We are only interested in symbols that are currently
undefined or common. */
if (h == NULL
|| (h->type != bfd_link_hash_undefined
&& h->type != bfd_link_hash_common))
continue;
if (type == (N_TEXT | N_EXT)
|| type == (N_DATA | N_EXT)
|| type == (N_BSS | N_EXT)
|| type == (N_ABS | N_EXT))
{
/* This object file defines this symbol. We must link it
in. This is true regardless of whether the current
definition of the symbol is undefined or common. If the
current definition is common, we have a case in which we
have already seen an object file including
int a;
and this object file from the archive includes
int a = 5;
In such a case we must include this object file.
FIXME: The SunOS 4.1.3 linker will pull in the archive
element if the symbol is defined in the .data section,
but not if it is defined in the .text section. That
seems a bit crazy to me, and I haven't implemented it.
However, it might be correct. */
if (!(*info->callbacks
->add_archive_element) (info, abfd, name, subsbfd))
return FALSE;
*pneeded = TRUE;
return TRUE;
}
if (type == (N_UNDF | N_EXT))
{
bfd_vma value;
value = GET_WORD (abfd, p->e_value);
if (value != 0)
{
/* This symbol is common in the object from the archive
file. */
if (h->type == bfd_link_hash_undefined)
{
bfd *symbfd;
unsigned int power;
symbfd = h->u.undef.abfd;
if (symbfd == NULL)
{
/* This symbol was created as undefined from
outside BFD. We assume that we should link
in the object file. This is done for the -u
option in the linker. */
if (!(*info->callbacks
->add_archive_element) (info, abfd, name, subsbfd))
return FALSE;
*pneeded = TRUE;
return TRUE;
}
/* Turn the current link symbol into a common
symbol. It is already on the undefs list. */
h->type = bfd_link_hash_common;
h->u.c.p = bfd_hash_allocate (&info->hash->table,
sizeof (struct bfd_link_hash_common_entry));
if (h->u.c.p == NULL)
return FALSE;
h->u.c.size = value;
/* FIXME: This isn't quite right. The maximum
alignment of a common symbol should be set by the
architecture of the output file, not of the input
file. */
power = bfd_log2 (value);
if (power > bfd_get_arch_info (abfd)->section_align_power)
power = bfd_get_arch_info (abfd)->section_align_power;
h->u.c.p->alignment_power = power;
h->u.c.p->section = bfd_make_section_old_way (symbfd,
"COMMON");
}
else
{
/* Adjust the size of the common symbol if
necessary. */
if (value > h->u.c.size)
h->u.c.size = value;
}
}
}
}
/* We do not need this object file. */
return TRUE;
}
/* Check a single archive element to see if we need to include it in
the link. *PNEEDED is set according to whether this element is
needed in the link or not. This is called from
_bfd_generic_link_add_archive_symbols. */
static bfd_boolean
aout_link_check_archive_element (bfd *abfd,
struct bfd_link_info *info,
struct bfd_link_hash_entry *h ATTRIBUTE_UNUSED,
const char *name ATTRIBUTE_UNUSED,
bfd_boolean *pneeded)
{
bfd *oldbfd;
bfd_boolean needed;
if (!aout_get_external_symbols (abfd))
return FALSE;
oldbfd = abfd;
if (!aout_link_check_ar_symbols (abfd, info, pneeded, &abfd))
return FALSE;
needed = *pneeded;
if (needed)
{
/* Potentially, the add_archive_element hook may have set a
substitute BFD for us. */
if (abfd != oldbfd)
{
if (!info->keep_memory
&& !aout_link_free_symbols (oldbfd))
return FALSE;
if (!aout_get_external_symbols (abfd))
return FALSE;
}
if (!aout_link_add_symbols (abfd, info))
return FALSE;
}
if (!info->keep_memory || !needed)
{
if (!aout_link_free_symbols (abfd))
return FALSE;
}
return TRUE;
}
/* Add all symbols from an object file to the hash table. */
static bfd_boolean
aout_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
{
bfd_boolean (*add_one_symbol)
(struct bfd_link_info *, bfd *, const char *, flagword, asection *,
bfd_vma, const char *, bfd_boolean, bfd_boolean,
struct bfd_link_hash_entry **);
struct external_nlist *syms;
bfd_size_type sym_count;
char *strings;
bfd_boolean copy;
struct aout_link_hash_entry **sym_hash;
struct external_nlist *p;
struct external_nlist *pend;
syms = obj_aout_external_syms (abfd);
sym_count = obj_aout_external_sym_count (abfd);
strings = obj_aout_external_strings (abfd);
if (info->keep_memory)
copy = FALSE;
else
copy = TRUE;
if (aout_backend_info (abfd)->add_dynamic_symbols != NULL)
{
if (! ((*aout_backend_info (abfd)->add_dynamic_symbols)
(abfd, info, &syms, &sym_count, &strings)))
return FALSE;
}
/* We keep a list of the linker hash table entries that correspond
to particular symbols. We could just look them up in the hash
table, but keeping the list is more efficient. Perhaps this
should be conditional on info->keep_memory. */
sym_hash = bfd_alloc (abfd,
sym_count * sizeof (struct aout_link_hash_entry *));
if (sym_hash == NULL && sym_count != 0)
return FALSE;
obj_aout_sym_hashes (abfd) = sym_hash;
add_one_symbol = aout_backend_info (abfd)->add_one_symbol;
if (add_one_symbol == NULL)
add_one_symbol = _bfd_generic_link_add_one_symbol;
p = syms;
pend = p + sym_count;
for (; p < pend; p++, sym_hash++)
{
int type;
const char *name;
bfd_vma value;
asection *section;
flagword flags;
const char *string;
*sym_hash = NULL;
type = H_GET_8 (abfd, p->e_type);
name = strings + GET_WORD (abfd, p->e_strx);
value = GET_WORD (abfd, p->e_value);
flags = BSF_GLOBAL;
string = NULL;
switch (type)
{
default:
/* Anything else should be a debugging symbol. */
BFD_ASSERT ((type & N_STAB) != 0);
continue;
case N_UNDF:
case N_ABS:
case N_TEXT:
case N_DATA:
case N_BSS:
case N_REG:
case N_FN:
/* Ignore symbols that are not externally visible. */
continue;
case N_UNDF | N_EXT:
if (value == 0)
{
section = bfd_und_section_ptr;
flags = 0;
}
else
section = bfd_com_section_ptr;
break;
case N_ABS | N_EXT:
section = bfd_abs_section_ptr;
break;
case N_TEXT | N_EXT:
section = obj_textsec (abfd);
value -= bfd_get_section_vma (abfd, section);
break;
case N_DATA | N_EXT:
/* Treat N_SETV symbols as N_DATA symbol; see comment in
translate_from_native_sym_flags. */
section = obj_datasec (abfd);
value -= bfd_get_section_vma (abfd, section);
break;
case N_BSS | N_EXT:
section = obj_bsssec (abfd);
value -= bfd_get_section_vma (abfd, section);
break;
}
if (! ((*add_one_symbol)
(info, abfd, name, flags, section, value, string, copy, FALSE,
(struct bfd_link_hash_entry **) sym_hash)))
return FALSE;
/* Restrict the maximum alignment of a common symbol based on
the architecture, since a.out has no way to represent
alignment requirements of a section in a .o file. FIXME:
This isn't quite right: it should use the architecture of the
output file, not the input files. */
if ((*sym_hash)->root.type == bfd_link_hash_common
&& ((*sym_hash)->root.u.c.p->alignment_power >
bfd_get_arch_info (abfd)->section_align_power))
(*sym_hash)->root.u.c.p->alignment_power =
bfd_get_arch_info (abfd)->section_align_power;
/* If this is a set symbol, and we are not building sets, then
it is possible for the hash entry to not have been set. In
such a case, treat the symbol as not globally defined. */
if ((*sym_hash)->root.type == bfd_link_hash_new)
{
BFD_ASSERT ((flags & BSF_CONSTRUCTOR) != 0);
*sym_hash = NULL;
}
}
return TRUE;
}
/* Look up an entry in an the header file hash table. */
#define aout_link_includes_lookup(table, string, create, copy) \
((struct aout_link_includes_entry *) \
bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
/* The function to create a new entry in the header file hash table. */
static struct bfd_hash_entry *
aout_link_includes_newfunc (struct bfd_hash_entry *entry,
struct bfd_hash_table *table,
const char *string)
{
struct aout_link_includes_entry * ret =
(struct aout_link_includes_entry *) entry;
/* Allocate the structure if it has not already been allocated by a
subclass. */
if (ret == NULL)
ret = bfd_hash_allocate (table,
sizeof (struct aout_link_includes_entry));
if (ret == NULL)
return NULL;
/* Call the allocation method of the superclass. */
ret = ((struct aout_link_includes_entry *)
bfd_hash_newfunc ((struct bfd_hash_entry *) ret, table, string));
if (ret)
/* Set local fields. */
ret->totals = NULL;
return (struct bfd_hash_entry *) ret;
}
static bfd_boolean
aout_link_write_other_symbol (struct bfd_hash_entry *bh, void *data)
{
struct aout_link_hash_entry *h = (struct aout_link_hash_entry *) bh;
struct aout_final_link_info *flaginfo = (struct aout_final_link_info *) data;
bfd *output_bfd;
int type;
bfd_vma val;
struct external_nlist outsym;
bfd_size_type indx;
bfd_size_type amt;
if (h->root.type == bfd_link_hash_warning)
{
h = (struct aout_link_hash_entry *) h->root.u.i.link;
if (h->root.type == bfd_link_hash_new)
return TRUE;
}
output_bfd = flaginfo->output_bfd;
if (aout_backend_info (output_bfd)->write_dynamic_symbol != NULL)
{
if (! ((*aout_backend_info (output_bfd)->write_dynamic_symbol)
(output_bfd, flaginfo->info, h)))
{
/* FIXME: No way to handle errors. */
abort ();
}
}
if (h->written)
return TRUE;
h->written = TRUE;
/* An indx of -2 means the symbol must be written. */
if (h->indx != -2
&& (flaginfo->info->strip == strip_all
|| (flaginfo->info->strip == strip_some
&& bfd_hash_lookup (flaginfo->info->keep_hash, h->root.root.string,
FALSE, FALSE) == NULL)))
return TRUE;
switch (h->root.type)
{
default:
abort ();
/* Avoid variable not initialized warnings. */
return TRUE;
case bfd_link_hash_new:
/* This can happen for set symbols when sets are not being
built. */
return TRUE;
case bfd_link_hash_undefined:
type = N_UNDF | N_EXT;
val = 0;
break;
case bfd_link_hash_defined:
case bfd_link_hash_defweak:
{
asection *sec;
sec = h->root.u.def.section->output_section;
BFD_ASSERT (bfd_is_abs_section (sec)
|| sec->owner == output_bfd);
if (sec == obj_textsec (output_bfd))
type = h->root.type == bfd_link_hash_defined ? N_TEXT : N_WEAKT;
else if (sec == obj_datasec (output_bfd))
type = h->root.type == bfd_link_hash_defined ? N_DATA : N_WEAKD;
else if (sec == obj_bsssec (output_bfd))
type = h->root.type == bfd_link_hash_defined ? N_BSS : N_WEAKB;
else
type = h->root.type == bfd_link_hash_defined ? N_ABS : N_WEAKA;
type |= N_EXT;
val = (h->root.u.def.value
+ sec->vma
+ h->root.u.def.section->output_offset);
}
break;
case bfd_link_hash_common:
type = N_UNDF | N_EXT;
val = h->root.u.c.size;
break;
case bfd_link_hash_undefweak:
type = N_WEAKU;
val = 0;
case bfd_link_hash_indirect:
case bfd_link_hash_warning:
/* FIXME: Ignore these for now. The circumstances under which
they should be written out are not clear to me. */
return TRUE;
}
H_PUT_8 (output_bfd, type, outsym.e_type);
indx = add_to_stringtab (output_bfd, flaginfo->strtab, h->root.root.string,
FALSE);
if (indx == (bfd_size_type) -1)
/* FIXME: No way to handle errors. */
abort ();
PUT_WORD (output_bfd, indx, outsym.e_strx);
PUT_WORD (output_bfd, val, outsym.e_value);
amt = EXTERNAL_NLIST_SIZE;
if (bfd_seek (output_bfd, flaginfo->symoff, SEEK_SET) != 0
|| bfd_bwrite ((void *) &outsym, amt, output_bfd) != amt)
/* FIXME: No way to handle errors. */
abort ();
flaginfo->symoff += amt;
h->indx = obj_aout_external_sym_count (output_bfd);
++obj_aout_external_sym_count (output_bfd);
return TRUE;
}
/* Handle a link order which is supposed to generate a reloc. */
static bfd_boolean
aout_link_reloc_link_order (struct aout_final_link_info *flaginfo,
asection *o,
struct bfd_link_order *p)
{
struct bfd_link_order_reloc *pr;
int r_index;
int r_extern;
reloc_howto_type *howto;
file_ptr *reloff_ptr;
struct reloc_std_external srel;
void * rel_ptr;
bfd_size_type rel_size;
pr = p->u.reloc.p;
if (p->type == bfd_section_reloc_link_order)
{
r_extern = 0;
if (bfd_is_abs_section (pr->u.section))
r_index = N_ABS | N_EXT;
else
{
BFD_ASSERT (pr->u.section->owner == flaginfo->output_bfd);
r_index = pr->u.section->target_index;
}
}
else
{
struct aout_link_hash_entry *h;
BFD_ASSERT (p->type == bfd_symbol_reloc_link_order);
r_extern = 1;
h = ((struct aout_link_hash_entry *)
bfd_wrapped_link_hash_lookup (flaginfo->output_bfd, flaginfo->info,
pr->u.name, FALSE, FALSE, TRUE));
if (h != NULL
&& h->indx >= 0)
r_index = h->indx;
else if (h != NULL)
{
/* We decided to strip this symbol, but it turns out that we
can't. Note that we lose the other and desc information
here. I don't think that will ever matter for a global
symbol. */
h->indx = -2;
h->written = FALSE;
if (!aout_link_write_other_symbol (&h->root.root, flaginfo))
return FALSE;
r_index = h->indx;
}
else
{
if (! ((*flaginfo->info->callbacks->unattached_reloc)
(flaginfo->info, pr->u.name, NULL, NULL, (bfd_vma) 0)))
return FALSE;
r_index = 0;
}
}
howto = bfd_reloc_type_lookup (flaginfo->output_bfd, pr->reloc);
if (howto == 0)
{
bfd_set_error (bfd_error_bad_value);
return FALSE;
}
if (o == obj_textsec (flaginfo->output_bfd))
reloff_ptr = &flaginfo->treloff;
else if (o == obj_datasec (flaginfo->output_bfd))
reloff_ptr = &flaginfo->dreloff;
else
abort ();
#ifdef MY_put_reloc
MY_put_reloc(flaginfo->output_bfd, r_extern, r_index, p->offset, howto,
&srel);
#else
{
int r_pcrel;
int r_baserel;
int r_jmptable;
int r_relative;
int r_length;
fprintf (stderr, "TODO: line %d in bfd/pdp11.c\n", __LINE__);
r_pcrel = howto->pc_relative;
r_baserel = (howto->type & 8) != 0;
r_jmptable = (howto->type & 16) != 0;
r_relative = (howto->type & 32) != 0;
r_length = howto->size;
PUT_WORD (flaginfo->output_bfd, p->offset, srel.r_address);
if (bfd_header_big_endian (flaginfo->output_bfd))
{
srel.r_index[0] = r_index >> 16;
srel.r_index[1] = r_index >> 8;
srel.r_index[2] = r_index;
srel.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
{
srel.r_index[2] = r_index >> 16;
srel.r_index[1] = r_index >> 8;
srel.r_index[0] = r_index;
srel.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));
}
}
#endif
rel_ptr = (void *) &srel;
/* We have to write the addend into the object file, since
standard a.out relocs are in place. It would be more
reliable if we had the current contents of the file here,
rather than assuming zeroes, but we can't read the file since
it was opened using bfd_openw. */
if (pr->addend != 0)
{
bfd_size_type size;
bfd_reloc_status_type r;
bfd_byte *buf;
bfd_boolean ok;
size = bfd_get_reloc_size (howto);
buf = bfd_zmalloc (size);
if (buf == NULL && size != 0)
return FALSE;
r = MY_relocate_contents (howto, flaginfo->output_bfd,
pr->addend, buf);
switch (r)
{
case bfd_reloc_ok:
break;
default:
case bfd_reloc_outofrange:
abort ();
case bfd_reloc_overflow:
if (! ((*flaginfo->info->callbacks->reloc_overflow)
(flaginfo->info, NULL,
(p->type == bfd_section_reloc_link_order
? bfd_section_name (flaginfo->output_bfd,
pr->u.section)
: pr->u.name),
howto->name, pr->addend, NULL,
(asection *) NULL, (bfd_vma) 0)))
{
free (buf);
return FALSE;
}
break;
}
ok = bfd_set_section_contents (flaginfo->output_bfd, o,
(void *) buf,
(file_ptr) p->offset,
size);
free (buf);
if (! ok)
return FALSE;
}
rel_size = obj_reloc_entry_size (flaginfo->output_bfd);
if (bfd_seek (flaginfo->output_bfd, *reloff_ptr, SEEK_SET) != 0
|| bfd_bwrite (rel_ptr, rel_size, flaginfo->output_bfd) != rel_size)
return FALSE;
*reloff_ptr += rel_size;
/* Assert that the relocs have not run into the symbols, and that n
the text relocs have not run into the data relocs. */
BFD_ASSERT (*reloff_ptr <= obj_sym_filepos (flaginfo->output_bfd)
&& (reloff_ptr != &flaginfo->treloff
|| (*reloff_ptr
<= obj_datasec (flaginfo->output_bfd)->rel_filepos)));
return TRUE;
}
/* Get the section corresponding to a reloc index. */
static inline asection *
aout_reloc_type_to_section (bfd *abfd, int type)
{
switch (type)
{
case RTEXT: return obj_textsec (abfd);
case RDATA: return obj_datasec (abfd);
case RBSS: return obj_bsssec (abfd);
case RABS: return bfd_abs_section_ptr;
case REXT: return bfd_und_section_ptr;
default: abort ();
}
}
static bfd_boolean
pdp11_aout_link_input_section (struct aout_final_link_info *flaginfo,
bfd *input_bfd,
asection *input_section,
bfd_byte *relocs,
bfd_size_type rel_size,
bfd_byte *contents)
{
bfd_boolean (*check_dynamic_reloc)
(struct bfd_link_info *, bfd *, asection *,
struct aout_link_hash_entry *, void *, bfd_byte *, bfd_boolean *,
bfd_vma *);
bfd *output_bfd;
bfd_boolean relocatable;
struct external_nlist *syms;
char *strings;
struct aout_link_hash_entry **sym_hashes;
int *symbol_map;
bfd_byte *rel;
bfd_byte *rel_end;
output_bfd = flaginfo->output_bfd;
check_dynamic_reloc = aout_backend_info (output_bfd)->check_dynamic_reloc;
BFD_ASSERT (obj_reloc_entry_size (input_bfd) == RELOC_SIZE);
BFD_ASSERT (input_bfd->xvec->header_byteorder
== output_bfd->xvec->header_byteorder);
relocatable = flaginfo->info->relocatable;
syms = obj_aout_external_syms (input_bfd);
strings = obj_aout_external_strings (input_bfd);
sym_hashes = obj_aout_sym_hashes (input_bfd);
symbol_map = flaginfo->symbol_map;
rel = relocs;
rel_end = rel + rel_size;
for (; rel < rel_end; rel += RELOC_SIZE)
{
bfd_vma r_addr;
int r_index;
int r_type;
int r_pcrel;
int r_extern;
reloc_howto_type *howto;
struct aout_link_hash_entry *h = NULL;
bfd_vma relocation;
bfd_reloc_status_type r;
int reloc_entry;
reloc_entry = GET_WORD (input_bfd, (void *) rel);
if (reloc_entry == 0)
continue;
{
unsigned int howto_idx;
r_index = (reloc_entry & RIDXMASK) >> 4;
r_type = reloc_entry & RTYPE;
r_pcrel = reloc_entry & RELFLG;
r_addr = (char *) rel - (char *) relocs;
r_extern = (r_type == REXT);
howto_idx = r_pcrel;
BFD_ASSERT (howto_idx < TABLE_SIZE (howto_table_pdp11));
howto = howto_table_pdp11 + howto_idx;
}
if (relocatable)
{
/* We are generating a relocatable output file, and must
modify the reloc accordingly. */
if (r_extern)
{
/* If we know the symbol this relocation is against,
convert it into a relocation against a section. This
is what the native linker does. */
h = sym_hashes[r_index];
if (h != NULL
&& (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak))
{
asection *output_section;
/* Compute a new r_index. */
output_section = h->root.u.def.section->output_section;
if (output_section == obj_textsec (output_bfd))
r_type = N_TEXT;
else if (output_section == obj_datasec (output_bfd))
r_type = N_DATA;
else if (output_section == obj_bsssec (output_bfd))
r_type = N_BSS;
else
r_type = N_ABS;
/* Add the symbol value and the section VMA to the
addend stored in the contents. */
relocation = (h->root.u.def.value
+ output_section->vma
+ h->root.u.def.section->output_offset);
}
else
{
/* We must change r_index according to the symbol
map. */
r_index = symbol_map[r_index];
if (r_index == -1)
{
if (h != NULL)
{
/* We decided to strip this symbol, but it
turns out that we can't. Note that we
lose the other and desc information here.
I don't think that will ever matter for a
global symbol. */
if (h->indx < 0)
{
h->indx = -2;
h->written = FALSE;
if (!aout_link_write_other_symbol (&h->root.root,
flaginfo))
return FALSE;
}
r_index = h->indx;
}
else
{
const char *name;
name = strings + GET_WORD (input_bfd,
syms[r_index].e_strx);
if (! ((*flaginfo->info->callbacks->unattached_reloc)
(flaginfo->info, name, input_bfd, input_section,
r_addr)))
return FALSE;
r_index = 0;
}
}
relocation = 0;
}
/* Write out the new r_index value. */
reloc_entry = GET_WORD (input_bfd, rel);
reloc_entry &= RIDXMASK;
reloc_entry |= r_index << 4;
PUT_WORD (input_bfd, reloc_entry, rel);
}
else
{
asection *section;
/* This is a relocation against a section. We must
adjust by the amount that the section moved. */
section = aout_reloc_type_to_section (input_bfd, r_type);
relocation = (section->output_section->vma
+ section->output_offset
- section->vma);
}
/* Change the address of the relocation. */
fprintf (stderr, "TODO: change the address of the relocation\n");
/* Adjust a PC relative relocation by removing the reference
to the original address in the section and including the
reference to the new address. */
if (r_pcrel)
relocation -= (input_section->output_section->vma
+ input_section->output_offset
- input_section->vma);
#ifdef MY_relocatable_reloc
MY_relocatable_reloc (howto, output_bfd, rel, relocation, r_addr);
#endif
if (relocation == 0)
r = bfd_reloc_ok;
else
r = MY_relocate_contents (howto,
input_bfd, relocation,
contents + r_addr);
}
else
{
bfd_boolean hundef;
/* We are generating an executable, and must do a full
relocation. */
hundef = FALSE;
if (r_extern)
{
h = sym_hashes[r_index];
if (h != NULL
&& (h->root.type == bfd_link_hash_defined
|| h->root.type == bfd_link_hash_defweak))
{
relocation = (h->root.u.def.value
+ h->root.u.def.section->output_section->vma
+ h->root.u.def.section->output_offset);
}
else if (h != NULL
&& h->root.type == bfd_link_hash_undefweak)
relocation = 0;
else
{
hundef = TRUE;
relocation = 0;
}
}
else
{
asection *section;
section = aout_reloc_type_to_section (input_bfd, r_type);
relocation = (section->output_section->vma
+ section->output_offset
- section->vma);
if (r_pcrel)
relocation += input_section->vma;
}
if (check_dynamic_reloc != NULL)
{
bfd_boolean skip;
if (! ((*check_dynamic_reloc)
(flaginfo->info, input_bfd, input_section, h,
(void *) rel, contents, &skip, &relocation)))
return FALSE;
if (skip)
continue;
}
/* Now warn if a global symbol is undefined. We could not
do this earlier, because check_dynamic_reloc might want
to skip this reloc. */
if (hundef && ! flaginfo->info->shared)
{
const char *name;
if (h != NULL)
name = h->root.root.string;
else
name = strings + GET_WORD (input_bfd, syms[r_index].e_strx);
if (! ((*flaginfo->info->callbacks->undefined_symbol)
(flaginfo->info, name, input_bfd, input_section,
r_addr, TRUE)))
return FALSE;
}
r = MY_final_link_relocate (howto,
input_bfd, input_section,
contents, r_addr, relocation,
(bfd_vma) 0);
}
if (r != bfd_reloc_ok)
{
switch (r)
{
default:
case bfd_reloc_outofrange:
abort ();
case bfd_reloc_overflow:
{
const char *name;
if (h != NULL)
name = NULL;
else if (r_extern)
name = strings + GET_WORD (input_bfd,
syms[r_index].e_strx);
else
{
asection *s;
s = aout_reloc_type_to_section (input_bfd, r_type);
name = bfd_section_name (input_bfd, s);
}
if (! ((*flaginfo->info->callbacks->reloc_overflow)
(flaginfo->info, (h ? &h->root : NULL), name,
howto->name, (bfd_vma) 0, input_bfd,
input_section, r_addr)))
return FALSE;
}
break;
}
}
}
return TRUE;
}
/* Link an a.out section into the output file. */
static bfd_boolean
aout_link_input_section (struct aout_final_link_info *flaginfo,
bfd *input_bfd,
asection *input_section,
file_ptr *reloff_ptr,
bfd_size_type rel_size)
{
bfd_size_type input_size;
void * relocs;
/* Get the section contents. */
input_size = input_section->size;
if (! bfd_get_section_contents (input_bfd, input_section,
(void *) flaginfo->contents,
(file_ptr) 0, input_size))
return FALSE;
/* Read in the relocs if we haven't already done it. */
if (aout_section_data (input_section) != NULL
&& aout_section_data (input_section)->relocs != NULL)
relocs = aout_section_data (input_section)->relocs;
else
{
relocs = flaginfo->relocs;
if (rel_size > 0)
{
if (bfd_seek (input_bfd, input_section->rel_filepos, SEEK_SET) != 0
|| bfd_bread (relocs, rel_size, input_bfd) != rel_size)
return FALSE;
}
}
/* Relocate the section contents. */
if (! pdp11_aout_link_input_section (flaginfo, input_bfd, input_section,
(bfd_byte *) relocs,
rel_size, flaginfo->contents))
return FALSE;
/* Write out the section contents. */
if (! bfd_set_section_contents (flaginfo->output_bfd,
input_section->output_section,
(void *) flaginfo->contents,
(file_ptr) input_section->output_offset,
input_size))
return FALSE;
/* If we are producing relocatable output, the relocs were
modified, and we now write them out. */
if (flaginfo->info->relocatable && rel_size > 0)
{
if (bfd_seek (flaginfo->output_bfd, *reloff_ptr, SEEK_SET) != 0)
return FALSE;
if (bfd_bwrite (relocs, rel_size, flaginfo->output_bfd) != rel_size)
return FALSE;
*reloff_ptr += rel_size;
/* Assert that the relocs have not run into the symbols, and
that if these are the text relocs they have not run into the
data relocs. */
BFD_ASSERT (*reloff_ptr <= obj_sym_filepos (flaginfo->output_bfd)
&& (reloff_ptr != &flaginfo->treloff
|| (*reloff_ptr
<= obj_datasec (flaginfo->output_bfd)->rel_filepos)));
}
return TRUE;
}
/* Link an a.out input BFD into the output file. */
static bfd_boolean
aout_link_input_bfd (struct aout_final_link_info *flaginfo, bfd *input_bfd)
{
BFD_ASSERT (bfd_get_format (input_bfd) == bfd_object);
/* If this is a dynamic object, it may need special handling. */
if ((input_bfd->flags & DYNAMIC) != 0
&& aout_backend_info (input_bfd)->link_dynamic_object != NULL)
return ((*aout_backend_info (input_bfd)->link_dynamic_object)
(flaginfo->info, input_bfd));
/* Get the symbols. We probably have them already, unless
flaginfo->info->keep_memory is FALSE. */
if (! aout_get_external_symbols (input_bfd))
return FALSE;
/* Write out the symbols and get a map of the new indices. The map
is placed into flaginfo->symbol_map. */
if (! aout_link_write_symbols (flaginfo, input_bfd))
return FALSE;
/* Relocate and write out the sections. These functions use the
symbol map created by aout_link_write_symbols. The linker_mark
field will be set if these sections are to be included in the
link, which will normally be the case. */
if (obj_textsec (input_bfd)->linker_mark)
{
if (! aout_link_input_section (flaginfo, input_bfd,
obj_textsec (input_bfd),
&flaginfo->treloff,
exec_hdr (input_bfd)->a_trsize))
return FALSE;
}
if (obj_datasec (input_bfd)->linker_mark)
{
if (! aout_link_input_section (flaginfo, input_bfd,
obj_datasec (input_bfd),
&flaginfo->dreloff,
exec_hdr (input_bfd)->a_drsize))
return FALSE;
}
/* If we are not keeping memory, we don't need the symbols any
longer. We still need them if we are keeping memory, because the
strings in the hash table point into them. */
if (! flaginfo->info->keep_memory)
{
if (! aout_link_free_symbols (input_bfd))
return FALSE;
}
return TRUE;
}
/* Do the final link step. This is called on the output BFD. The
INFO structure should point to a list of BFDs linked through the
link.next field which can be used to find each BFD which takes part
in the output. Also, each section in ABFD should point to a list
of bfd_link_order structures which list all the input sections for
the output section. */
bfd_boolean
NAME (aout, final_link) (bfd *abfd,
struct bfd_link_info *info,
void (*callback) (bfd *, file_ptr *, file_ptr *, file_ptr *))
{
struct aout_final_link_info aout_info;
bfd_boolean includes_hash_initialized = FALSE;
bfd *sub;
bfd_size_type trsize, drsize;
bfd_size_type max_contents_size;
bfd_size_type max_relocs_size;
bfd_size_type max_sym_count;
bfd_size_type text_size;
file_ptr text_end;
struct bfd_link_order *p;
asection *o;
bfd_boolean have_link_order_relocs;
if (info->shared)
abfd->flags |= DYNAMIC;
aout_info.info = info;
aout_info.output_bfd = abfd;
aout_info.contents = NULL;
aout_info.relocs = NULL;
aout_info.symbol_map = NULL;
aout_info.output_syms = NULL;
if (!bfd_hash_table_init_n (&aout_info.includes.root,
aout_link_includes_newfunc,
sizeof (struct aout_link_includes_entry),
251))
goto error_return;
includes_hash_initialized = TRUE;
/* Figure out the largest section size. Also, if generating
relocatable output, count the relocs. */
trsize = 0;
drsize = 0;
max_contents_size = 0;
max_relocs_size = 0;
max_sym_count = 0;
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
{
size_t sz;
if (info->relocatable)
{
if (bfd_get_flavour (sub) == bfd_target_aout_flavour)
{
trsize += exec_hdr (sub)->a_trsize;
drsize += exec_hdr (sub)->a_drsize;
}
else
{
/* FIXME: We need to identify the .text and .data sections
and call get_reloc_upper_bound and canonicalize_reloc to
work out the number of relocs needed, and then multiply
by the reloc size. */
(*_bfd_error_handler)
("%s: relocatable link from %s to %s not supported",
bfd_get_filename (abfd),
sub->xvec->name, abfd->xvec->name);
bfd_set_error (bfd_error_invalid_operation);
goto error_return;
}
}
if (bfd_get_flavour (sub) == bfd_target_aout_flavour)
{
sz = obj_textsec (sub)->size;
if (sz > max_contents_size)
max_contents_size = sz;
sz = obj_datasec (sub)->size;
if (sz > max_contents_size)
max_contents_size = sz;
sz = exec_hdr (sub)->a_trsize;
if (sz > max_relocs_size)
max_relocs_size = sz;
sz = exec_hdr (sub)->a_drsize;
if (sz > max_relocs_size)
max_relocs_size = sz;
sz = obj_aout_external_sym_count (sub);
if (sz > max_sym_count)
max_sym_count = sz;
}
}
if (info->relocatable)
{
if (obj_textsec (abfd) != NULL)
trsize += (_bfd_count_link_order_relocs (obj_textsec (abfd)
->map_head.link_order)
* obj_reloc_entry_size (abfd));
if (obj_datasec (abfd) != NULL)
drsize += (_bfd_count_link_order_relocs (obj_datasec (abfd)
->map_head.link_order)
* obj_reloc_entry_size (abfd));
}
exec_hdr (abfd)->a_trsize = trsize;
exec_hdr (abfd)->a_drsize = drsize;
exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
/* Adjust the section sizes and vmas according to the magic number.
This sets a_text, a_data and a_bss in the exec_hdr and sets the
filepos for each section. */
if (! NAME (aout, adjust_sizes_and_vmas) (abfd, &text_size, &text_end))
goto error_return;
/* The relocation and symbol file positions differ among a.out
targets. We are passed a callback routine from the backend
specific code to handle this.
FIXME: At this point we do not know how much space the symbol
table will require. This will not work for any (nonstandard)
a.out target that needs to know the symbol table size before it
can compute the relocation file positions. This may or may not
be the case for the hp300hpux target, for example. */
(*callback) (abfd, &aout_info.treloff, &aout_info.dreloff,
&aout_info.symoff);
obj_textsec (abfd)->rel_filepos = aout_info.treloff;
obj_datasec (abfd)->rel_filepos = aout_info.dreloff;
obj_sym_filepos (abfd) = aout_info.symoff;
/* We keep a count of the symbols as we output them. */
obj_aout_external_sym_count (abfd) = 0;
/* We accumulate the string table as we write out the symbols. */
aout_info.strtab = _bfd_stringtab_init ();
if (aout_info.strtab == NULL)
goto error_return;
/* Allocate buffers to hold section contents and relocs. */
aout_info.contents = bfd_malloc (max_contents_size);
aout_info.relocs = bfd_malloc (max_relocs_size);
aout_info.symbol_map = bfd_malloc (max_sym_count * sizeof (int *));
aout_info.output_syms = bfd_malloc ((max_sym_count + 1)
* sizeof (struct external_nlist));
if ((aout_info.contents == NULL && max_contents_size != 0)
|| (aout_info.relocs == NULL && max_relocs_size != 0)
|| (aout_info.symbol_map == NULL && max_sym_count != 0)
|| aout_info.output_syms == NULL)
goto error_return;
/* If we have a symbol named __DYNAMIC, force it out now. This is
required by SunOS. Doing this here rather than in sunos.c is a
hack, but it's easier than exporting everything which would be
needed. */
{
struct aout_link_hash_entry *h;
h = aout_link_hash_lookup (aout_hash_table (info), "__DYNAMIC",
FALSE, FALSE, FALSE);
if (h != NULL)
aout_link_write_other_symbol (&h->root.root, &aout_info);
}
/* The most time efficient way to do the link would be to read all
the input object files into memory and then sort out the
information into the output file. Unfortunately, that will
probably use too much memory. Another method would be to step
through everything that composes the text section and write it
out, and then everything that composes the data section and write
it out, and then write out the relocs, and then write out the
symbols. Unfortunately, that requires reading stuff from each
input file several times, and we will not be able to keep all the
input files open simultaneously, and reopening them will be slow.
What we do is basically process one input file at a time. We do
everything we need to do with an input file once--copy over the
section contents, handle the relocation information, and write
out the symbols--and then we throw away the information we read
from it. This approach requires a lot of lseeks of the output
file, which is unfortunate but still faster than reopening a lot
of files.
We use the output_has_begun field of the input BFDs to see
whether we have already handled it. */
for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
sub->output_has_begun = FALSE;
/* Mark all sections which are to be included in the link. This
will normally be every section. We need to do this so that we
can identify any sections which the linker has decided to not
include. */
for (o = abfd->sections; o != NULL; o = o->next)
{
for (p = o->map_head.link_order; p != NULL; p = p->next)
if (p->type == bfd_indirect_link_order)
p->u.indirect.section->linker_mark = TRUE;
}
have_link_order_relocs = FALSE;
for (o = abfd->sections; o != NULL; o = o->next)
{
for (p = o->map_head.link_order;
p != NULL;
p = p->next)
{
if (p->type == bfd_indirect_link_order
&& (bfd_get_flavour (p->u.indirect.section->owner)
== bfd_target_aout_flavour))
{
bfd *input_bfd;
input_bfd = p->u.indirect.section->owner;
if (! input_bfd->output_has_begun)
{
if (! aout_link_input_bfd (&aout_info, input_bfd))
goto error_return;
input_bfd->output_has_begun = TRUE;
}
}
else if (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order)
/* These are handled below. */
have_link_order_relocs = TRUE;
else
{
if (! _bfd_default_link_order (abfd, info, o, p))
goto error_return;
}
}
}
/* Write out any symbols that we have not already written out. */
bfd_hash_traverse (&info->hash->table,
aout_link_write_other_symbol,
&aout_info);
/* Now handle any relocs we were asked to create by the linker.
These did not come from any input file. We must do these after
we have written out all the symbols, so that we know the symbol
indices to use. */
if (have_link_order_relocs)
{
for (o = abfd->sections; o != NULL; o = o->next)
{
for (p = o->map_head.link_order;
p != NULL;
p = p->next)
{
if (p->type == bfd_section_reloc_link_order
|| p->type == bfd_symbol_reloc_link_order)
{
if (! aout_link_reloc_link_order (&aout_info, o, p))
goto error_return;
}
}
}
}
if (aout_info.contents != NULL)
{
free (aout_info.contents);
aout_info.contents = NULL;
}
if (aout_info.relocs != NULL)
{
free (aout_info.relocs);
aout_info.relocs = NULL;
}
if (aout_info.symbol_map != NULL)
{
free (aout_info.symbol_map);
aout_info.symbol_map = NULL;
}
if (aout_info.output_syms != NULL)
{
free (aout_info.output_syms);
aout_info.output_syms = NULL;
}
if (includes_hash_initialized)
{
bfd_hash_table_free (&aout_info.includes.root);
includes_hash_initialized = FALSE;
}
/* Finish up any dynamic linking we may be doing. */
if (aout_backend_info (abfd)->finish_dynamic_link != NULL)
{
if (! (*aout_backend_info (abfd)->finish_dynamic_link) (abfd, info))
goto error_return;
}
/* Update the header information. */
abfd->symcount = obj_aout_external_sym_count (abfd);
exec_hdr (abfd)->a_syms = abfd->symcount * EXTERNAL_NLIST_SIZE;
obj_str_filepos (abfd) = obj_sym_filepos (abfd) + exec_hdr (abfd)->a_syms;
obj_textsec (abfd)->reloc_count =
exec_hdr (abfd)->a_trsize / obj_reloc_entry_size (abfd);
obj_datasec (abfd)->reloc_count =
exec_hdr (abfd)->a_drsize / obj_reloc_entry_size (abfd);
/* Write out the string table, unless there are no symbols. */
if (abfd->symcount > 0)
{
if (bfd_seek (abfd, obj_str_filepos (abfd), SEEK_SET) != 0
|| ! emit_stringtab (abfd, aout_info.strtab))
goto error_return;
}
else if (obj_textsec (abfd)->reloc_count == 0
&& obj_datasec (abfd)->reloc_count == 0)
{
bfd_byte b;
b = 0;
if (bfd_seek (abfd,
(file_ptr) (obj_datasec (abfd)->filepos
+ exec_hdr (abfd)->a_data
- 1),
SEEK_SET) != 0
|| bfd_bwrite (&b, (bfd_size_type) 1, abfd) != 1)
goto error_return;
}
return TRUE;
error_return:
if (aout_info.contents != NULL)
free (aout_info.contents);
if (aout_info.relocs != NULL)
free (aout_info.relocs);
if (aout_info.symbol_map != NULL)
free (aout_info.symbol_map);
if (aout_info.output_syms != NULL)
free (aout_info.output_syms);
if (includes_hash_initialized)
bfd_hash_table_free (&aout_info.includes.root);
return FALSE;
}
/* Adjust and write out the symbols for an a.out file. Set the new
symbol indices into a symbol_map. */
static bfd_boolean
aout_link_write_symbols (struct aout_final_link_info *flaginfo, bfd *input_bfd)
{
bfd *output_bfd;
bfd_size_type sym_count;
char *strings;
enum bfd_link_strip strip;
enum bfd_link_discard discard;
struct external_nlist *outsym;
bfd_size_type strtab_index;
struct external_nlist *sym;
struct external_nlist *sym_end;
struct aout_link_hash_entry **sym_hash;
int *symbol_map;
bfd_boolean pass;
bfd_boolean skip_next;
output_bfd = flaginfo->output_bfd;
sym_count = obj_aout_external_sym_count (input_bfd);
strings = obj_aout_external_strings (input_bfd);
strip = flaginfo->info->strip;
discard = flaginfo->info->discard;
outsym = flaginfo->output_syms;
/* First write out a symbol for this object file, unless we are
discarding such symbols. */
if (strip != strip_all
&& (strip != strip_some
|| bfd_hash_lookup (flaginfo->info->keep_hash, input_bfd->filename,
FALSE, FALSE) != NULL)
&& discard != discard_all)
{
H_PUT_8 (output_bfd, N_TEXT, outsym->e_type);
strtab_index = add_to_stringtab (output_bfd, flaginfo->strtab,
input_bfd->filename, FALSE);
if (strtab_index == (bfd_size_type) -1)
return FALSE;
PUT_WORD (output_bfd, strtab_index, outsym->e_strx);
PUT_WORD (output_bfd,
(bfd_get_section_vma (output_bfd,
obj_textsec (input_bfd)->output_section)
+ obj_textsec (input_bfd)->output_offset),
outsym->e_value);
++obj_aout_external_sym_count (output_bfd);
++outsym;
}
pass = FALSE;
skip_next = FALSE;
sym = obj_aout_external_syms (input_bfd);
sym_end = sym + sym_count;
sym_hash = obj_aout_sym_hashes (input_bfd);
symbol_map = flaginfo->symbol_map;
memset (symbol_map, 0, (size_t) sym_count * sizeof *symbol_map);
for (; sym < sym_end; sym++, sym_hash++, symbol_map++)
{
const char *name;
int type;
struct aout_link_hash_entry *h;
bfd_boolean skip;
asection *symsec;
bfd_vma val = 0;
bfd_boolean copy;
/* We set *symbol_map to 0 above for all symbols. If it has
already been set to -1 for this symbol, it means that we are
discarding it because it appears in a duplicate header file.
See the N_BINCL code below. */
if (*symbol_map == -1)
continue;
/* Initialize *symbol_map to -1, which means that the symbol was
not copied into the output file. We will change it later if
we do copy the symbol over. */
*symbol_map = -1;
type = H_GET_8 (input_bfd, sym->e_type);
name = strings + GET_WORD (input_bfd, sym->e_strx);
h = NULL;
if (pass)
{
/* Pass this symbol through. It is the target of an
indirect or warning symbol. */
val = GET_WORD (input_bfd, sym->e_value);
pass = FALSE;
}
else if (skip_next)
{
/* Skip this symbol, which is the target of an indirect
symbol that we have changed to no longer be an indirect
symbol. */
skip_next = FALSE;
continue;
}
else
{
struct aout_link_hash_entry *hresolve;
/* We have saved the hash table entry for this symbol, if
there is one. Note that we could just look it up again
in the hash table, provided we first check that it is an
external symbol. */
h = *sym_hash;
/* Use the name from the hash table, in case the symbol was
wrapped. */
if (h != NULL)
name = h->root.root.string;
/* If this is an indirect or warning symbol, then change
hresolve to the base symbol. We also change *sym_hash so
that the relocation routines relocate against the real
symbol. */
hresolve = h;
if (h != NULL
&& (h->root.type == bfd_link_hash_indirect
|| h->root.type == bfd_link_hash_warning))
{
hresolve = (struct aout_link_hash_entry *) h->root.u.i.link;
while (hresolve->root.type == bfd_link_hash_indirect
|| hresolve->root.type == bfd_link_hash_warning)
hresolve = ((struct aout_link_hash_entry *)
hresolve->root.u.i.link);
*sym_hash = hresolve;
}
/* If the symbol has already been written out, skip it. */
if (h != NULL
&& h->root.type != bfd_link_hash_warning
&& h->written)
{
if ((type & N_TYPE) == N_INDR
|| type == N_WARNING)
skip_next = TRUE;
*symbol_map = h->indx;
continue;
}
/* See if we are stripping this symbol. */
skip = FALSE;
switch (strip)
{
case strip_none:
break;
case strip_debugger:
if ((type & N_STAB) != 0)
skip = TRUE;
break;
case strip_some:
if (bfd_hash_lookup (flaginfo->info->keep_hash, name, FALSE, FALSE)
== NULL)
skip = TRUE;
break;
case strip_all:
skip = TRUE;
break;
}
if (skip)
{
if (h != NULL)
h->written = TRUE;
continue;
}
/* Get the value of the symbol. */
if ((type & N_TYPE) == N_TEXT
|| type == N_WEAKT)
symsec = obj_textsec (input_bfd);
else if ((type & N_TYPE) == N_DATA
|| type == N_WEAKD)
symsec = obj_datasec (input_bfd);
else if ((type & N_TYPE) == N_BSS
|| type == N_WEAKB)
symsec = obj_bsssec (input_bfd);
else if ((type & N_TYPE) == N_ABS
|| type == N_WEAKA)
symsec = bfd_abs_section_ptr;
else if (((type & N_TYPE) == N_INDR
&& (hresolve == NULL
|| (hresolve->root.type != bfd_link_hash_defined
&& hresolve->root.type != bfd_link_hash_defweak
&& hresolve->root.type != bfd_link_hash_common)))
|| type == N_WARNING)
{
/* Pass the next symbol through unchanged. The
condition above for indirect symbols is so that if
the indirect symbol was defined, we output it with
the correct definition so the debugger will
understand it. */
pass = TRUE;
val = GET_WORD (input_bfd, sym->e_value);
symsec = NULL;
}
else if ((type & N_STAB) != 0)
{
val = GET_WORD (input_bfd, sym->e_value);
symsec = NULL;
}
else
{
/* If we get here with an indirect symbol, it means that
we are outputting it with a real definition. In such
a case we do not want to output the next symbol,
which is the target of the indirection. */
if ((type & N_TYPE) == N_INDR)
skip_next = TRUE;
symsec = NULL;
/* We need to get the value from the hash table. We use
hresolve so that if we have defined an indirect
symbol we output the final definition. */
if (h == NULL)
{
switch (type & N_TYPE)
{
case N_SETT:
symsec = obj_textsec (input_bfd);
break;
case N_SETD:
symsec = obj_datasec (input_bfd);
break;
case N_SETB:
symsec = obj_bsssec (input_bfd);
break;
case N_SETA:
symsec = bfd_abs_section_ptr;
break;
default:
val = 0;
break;
}
}
else if (hresolve->root.type == bfd_link_hash_defined
|| hresolve->root.type == bfd_link_hash_defweak)
{
asection *input_section;
asection *output_section;
/* This case usually means a common symbol which was
turned into a defined symbol. */
input_section = hresolve->root.u.def.section;
output_section = input_section->output_section;
BFD_ASSERT (bfd_is_abs_section (output_section)
|| output_section->owner == output_bfd);
val = (hresolve->root.u.def.value
+ bfd_get_section_vma (output_bfd, output_section)
+ input_section->output_offset);
/* Get the correct type based on the section. If
this is a constructed set, force it to be
globally visible. */
if (type == N_SETT
|| type == N_SETD
|| type == N_SETB
|| type == N_SETA)
type |= N_EXT;
type &=~ N_TYPE;
if (output_section == obj_textsec (output_bfd))
type |= (hresolve->root.type == bfd_link_hash_defined
? N_TEXT
: N_WEAKT);
else if (output_section == obj_datasec (output_bfd))
type |= (hresolve->root.type == bfd_link_hash_defined
? N_DATA
: N_WEAKD);
else if (output_section == obj_bsssec (output_bfd))
type |= (hresolve->root.type == bfd_link_hash_defined
? N_BSS
: N_WEAKB);
else
type |= (hresolve->root.type == bfd_link_hash_defined
? N_ABS
: N_WEAKA);
}
else if (hresolve->root.type == bfd_link_hash_common)
val = hresolve->root.u.c.size;
else if (hresolve->root.type == bfd_link_hash_undefweak)
{
val = 0;
type = N_WEAKU;
}
else
val = 0;
}
if (symsec != NULL)
val = (symsec->output_section->vma
+ symsec->output_offset
+ (GET_WORD (input_bfd, sym->e_value)
- symsec->vma));
/* If this is a global symbol set the written flag, and if
it is a local symbol see if we should discard it. */
if (h != NULL)
{
h->written = TRUE;
h->indx = obj_aout_external_sym_count (output_bfd);
}
else if ((type & N_TYPE) != N_SETT
&& (type & N_TYPE) != N_SETD
&& (type & N_TYPE) != N_SETB
&& (type & N_TYPE) != N_SETA)
{
switch (discard)
{
case discard_none:
case discard_sec_merge:
break;
case discard_l:
if ((type & N_STAB) == 0
&& bfd_is_local_label_name (input_bfd, name))
skip = TRUE;
break;
case discard_all:
skip = TRUE;
break;
}
if (skip)
{
pass = FALSE;
continue;
}
}
/* An N_BINCL symbol indicates the start of the stabs
entries for a header file. We need to scan ahead to the
next N_EINCL symbol, ignoring nesting, adding up all the
characters in the symbol names, not including the file
numbers in types (the first number after an open
parenthesis). */
if (type == N_BINCL)
{
struct external_nlist *incl_sym;
int nest;
struct aout_link_includes_entry *incl_entry;
struct aout_link_includes_totals *t;
val = 0;
nest = 0;
for (incl_sym = sym + 1; incl_sym < sym_end; incl_sym++)
{
int incl_type;
incl_type = H_GET_8 (input_bfd, incl_sym->e_type);
if (incl_type == N_EINCL)
{
if (nest == 0)
break;
--nest;
}
else if (incl_type == N_BINCL)
++nest;
else if (nest == 0)
{
const char *s;
s = strings + GET_WORD (input_bfd, incl_sym->e_strx);
for (; *s != '\0'; s++)
{
val += *s;
if (*s == '(')
{
/* Skip the file number. */
++s;
while (ISDIGIT (*s))
++s;
--s;
}
}
}
}
/* If we have already included a header file with the
same value, then replace this one with an N_EXCL
symbol. */
copy = ! flaginfo->info->keep_memory;
incl_entry = aout_link_includes_lookup (&flaginfo->includes,
name, TRUE, copy);
if (incl_entry == NULL)
return FALSE;
for (t = incl_entry->totals; t != NULL; t = t->next)
if (t->total == val)
break;
if (t == NULL)
{
/* This is the first time we have seen this header
file with this set of stabs strings. */
t = bfd_hash_allocate (&flaginfo->includes.root,
sizeof *t);
if (t == NULL)
return FALSE;
t->total = val;
t->next = incl_entry->totals;
incl_entry->totals = t;
}
else
{
int *incl_map;
/* This is a duplicate header file. We must change
it to be an N_EXCL entry, and mark all the
included symbols to prevent outputting them. */
type = N_EXCL;
nest = 0;
for (incl_sym = sym + 1, incl_map = symbol_map + 1;
incl_sym < sym_end;
incl_sym++, incl_map++)
{
int incl_type;
incl_type = H_GET_8 (input_bfd, incl_sym->e_type);
if (incl_type == N_EINCL)
{
if (nest == 0)
{
*incl_map = -1;
break;
}
--nest;
}
else if (incl_type == N_BINCL)
++nest;
else if (nest == 0)
*incl_map = -1;
}
}
}
}
/* Copy this symbol into the list of symbols we are going to
write out. */
H_PUT_8 (output_bfd, type, outsym->e_type);
copy = FALSE;
if (! flaginfo->info->keep_memory)
{
/* name points into a string table which we are going to
free. If there is a hash table entry, use that string.
Otherwise, copy name into memory. */
if (h != NULL)
name = h->root.root.string;
else
copy = TRUE;
}
strtab_index = add_to_stringtab (output_bfd, flaginfo->strtab,
name, copy);
if (strtab_index == (bfd_size_type) -1)
return FALSE;
PUT_WORD (output_bfd, strtab_index, outsym->e_strx);
PUT_WORD (output_bfd, val, outsym->e_value);
*symbol_map = obj_aout_external_sym_count (output_bfd);
++obj_aout_external_sym_count (output_bfd);
++outsym;
}
/* Write out the output symbols we have just constructed. */
if (outsym > flaginfo->output_syms)
{
bfd_size_type size;
if (bfd_seek (output_bfd, flaginfo->symoff, SEEK_SET) != 0)
return FALSE;
size = outsym - flaginfo->output_syms;
size *= EXTERNAL_NLIST_SIZE;
if (bfd_bwrite ((void *) flaginfo->output_syms, size, output_bfd) != size)
return FALSE;
flaginfo->symoff += size;
}
return TRUE;
}
/* Write out a symbol that was not associated with an a.out input
object. */
static bfd_vma
bfd_getp32 (const void *p)
{
const bfd_byte *addr = p;
unsigned long v;
v = (unsigned long) addr[1] << 24;
v |= (unsigned long) addr[0] << 16;
v |= (unsigned long) addr[3] << 8;
v |= (unsigned long) addr[2];
return v;
}
#define COERCE32(x) (((bfd_signed_vma) (x) ^ 0x80000000) - 0x80000000)
static bfd_signed_vma
bfd_getp_signed_32 (const void *p)
{
const bfd_byte *addr = p;
unsigned long v;
v = (unsigned long) addr[1] << 24;
v |= (unsigned long) addr[0] << 16;
v |= (unsigned long) addr[3] << 8;
v |= (unsigned long) addr[2];
return COERCE32 (v);
}
static void
bfd_putp32 (bfd_vma data, void *p)
{
bfd_byte *addr = p;
addr[0] = (data >> 16) & 0xff;
addr[1] = (data >> 24) & 0xff;
addr[2] = (data >> 0) & 0xff;
addr[3] = (data >> 8) & 0xff;
}
const bfd_target MY (vec) =
{
TARGETNAME, /* 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),
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC | SEC_CODE | SEC_DATA),
MY_symbol_leading_char,
AR_PAD_CHAR, /* AR_pad_char. */
15, /* AR_max_namelen. */
0, /* match priority. */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getp32, bfd_getp_signed_32, bfd_putp32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Data. */
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
bfd_getp32, bfd_getp_signed_32, bfd_putp32,
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* Headers. */
{_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 (MY),
/* Alternative_target. */
NULL,
(void *) MY_backend_data
};
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