Make writing to files work properly. (Fixes to BFD are also needed.)

[binutils.git] / bfd / aoutf1.h

/* A.out "format 1" file handling code
   Copyright (C) 1990-1991 Free Software Foundation, Inc.
   Written by Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <ansidecl.h>
#include <sysdep.h>
struct external_exec;
#include <a.out.sun4.h>
#include "bfd.h"
#include "libaout.h"           
#include "libbfd.h"

#include "aout64.h"
#include "stab.gnu.h"
#include "ar.h"

/*
The file @code{aoutf1.h} contains the code for BFD's
a.out back end. Control over the generated back end is given by these
two preprocessor names:
@table @code
@item ARCH_SIZE
This value should be either 32 or 64, depending upon the size of an
int in the target format. It changes the sizes of the structs which
perform the memory/disk mapping of structures.

The 64 bit backend may only be used if the host compiler supports 64
ints (eg long long with gcc), by defining the name @code{HOST_64_BIT} in @code{bfd.h}.
With this name defined, @emph{all} bfd operations are performed with 64bit
arithmetic, not just those to a 64bit target.

@item TARGETNAME
The name put into the target vector.
@item
@end table

*/

void (*bfd_error_trap)();

static bfd_target *sunos4_callback ();

/*SUPPRESS558*/
/*SUPPRESS529*/

bfd_target *
DEFUN(NAME(sunos,object_p), (abfd),
     bfd *abfd)
{
  unsigned char magicbuf[4];	/* Raw bytes of magic number from file */
  unsigned long magic;		/* Swapped magic number */

  bfd_error = system_call_error;

  if (bfd_read ((PTR)magicbuf, 1 , 4, abfd) !=
      sizeof (magicbuf))
    return 0;
  magic = bfd_h_get_32 (abfd, magicbuf);

  if (N_BADMAG (*((struct internal_exec *) &magic))) return 0;

  return NAME(aout,some_aout_object_p) (abfd, sunos4_callback);
}

  /* Determine the size of a relocation entry, based on the architecture */
static void
DEFUN(choose_reloc_size,(abfd),
bfd *abfd)
  {
    switch (abfd->obj_arch) {
    case bfd_arch_sparc:
    case bfd_arch_a29k:
      obj_reloc_entry_size (abfd) = RELOC_EXT_SIZE;
      break;
    default:
      obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
      break;
    }
  }

/* Set parameters about this a.out file that are machine-dependent.
   This routine is called from some_aout_object_p just before it returns.  */

static bfd_target *
sunos4_callback (abfd)
     bfd *abfd;
{
  struct internal_exec *execp = exec_hdr (abfd);

  WORK_OUT_FILE_POSITIONS(abfd, execp);  

  /* Determine the architecture and machine type of the object file.  */
  switch (N_MACHTYPE (*exec_hdr (abfd))) {
    
  case M_UNKNOWN:
    abfd->obj_arch = bfd_arch_unknown;
    abfd->obj_machine = 0;
    break;
    
  case M_68010:
    abfd->obj_arch = bfd_arch_m68k;
    abfd->obj_machine = 68010;
    break;
    
  case M_68020:
    abfd->obj_arch = bfd_arch_m68k;
    abfd->obj_machine = 68020;
    break;
    
  case M_SPARC:
    abfd->obj_arch = bfd_arch_sparc;
    abfd->obj_machine = 0;
    break;
    
  case M_386:
    abfd->obj_arch = bfd_arch_i386;
    abfd->obj_machine = 0;
    break;
    
  case M_29K:
    abfd->obj_arch = bfd_arch_a29k;
    abfd->obj_machine = 0;
    break;
    
  default:
    abfd->obj_arch = bfd_arch_obscure;
    abfd->obj_machine = 0;
    break;
  }
  
  choose_reloc_size(abfd);
  return abfd->xvec;
}


/* Write an object file in SunOS format.
Section contents have already been written.  We write the
file header, symbols, and relocation.  */

boolean
DEFUN(NAME(aout,sunos4_write_object_contents),(abfd),
      bfd *abfd)

  {
    bfd_size_type data_pad = 0;
    struct external_exec exec_bytes;
    struct internal_exec *execp = exec_hdr (abfd);
    
    
    
    execp->a_text = obj_textsec (abfd)->size;
    
    /* Magic number, maestro, please!  */
    switch (bfd_get_architecture(abfd)) {
    case bfd_arch_m68k:
      switch (bfd_get_machine(abfd)) {
      case 68010:
	N_SET_MACHTYPE(*execp, M_68010);
	break;
      default:
      case 68020:
	N_SET_MACHTYPE(*execp, M_68020);
	break;
      }
      break;
    case bfd_arch_sparc:
      N_SET_MACHTYPE(*execp, M_SPARC);
      break;
    case bfd_arch_i386:
      N_SET_MACHTYPE(*execp, M_386);
      break;
    case bfd_arch_a29k:
      N_SET_MACHTYPE(*execp, M_29K);
      break;
    default:
      N_SET_MACHTYPE(*execp, M_UNKNOWN);
    }
    
    choose_reloc_size(abfd);

    /* FIXME */
    N_SET_FLAGS (*execp, 0x1);
    
    WRITE_HEADERS(abfd, execp);

  return true;
}
\f
/* core files */

#define CORE_MAGIC 0x080456
#define CORE_NAMELEN 16

/* The core structure is taken from the Sun documentation.
Unfortunately, they don't document the FPA structure, or at least I
can't find it easily.  Fortunately the core header contains its own
length.  So this shouldn't cause problems, except for c_ucode, which
so far we don't use but is easy to find with a little arithmetic. */

/* But the reg structure can be gotten from the SPARC processor handbook.
This really should be in a GNU include file though so that gdb can use
the same info. */
struct regs {
  int r_psr;
  int r_pc;
  int r_npc;
  int r_y;
  int r_g1;
  int r_g2;
  int r_g3;
  int r_g4;
  int r_g5;
  int r_g6;
  int r_g7;
  int r_o0;
  int r_o1;
  int r_o2;
  int r_o3;
  int r_o4;
  int r_o5;
  int r_o6;
  int r_o7;
};

/* Taken from Sun documentation: */

/* FIXME:  It's worse than we expect.  This struct contains TWO substructs
neither of whose size we know, WITH STUFF IN BETWEEN THEM!  We can't
even portably access the stuff in between!  */

struct external_sparc_core {
  int c_magic;			/* Corefile magic number */
  int c_len;			/* Sizeof (struct core) */
#define	SPARC_CORE_LEN	432
  int c_regs[19];		/* General purpose registers -- MACHDEP SIZE */
  struct external_exec c_aouthdr;	/* A.out header */
  int c_signo;			/* Killing signal, if any */
  int c_tsize;			/* Text size (bytes) */
  int c_dsize;			/* Data size (bytes) */
  int c_ssize;			/* Stack size (bytes) */
  char c_cmdname[CORE_NAMELEN + 1]; /* Command name */
  double fp_stuff[1];		    /* external FPU state (size unknown by us) */
  /* The type "double" is critical here, for alignment.
    SunOS declares a struct here, but the struct's alignment
      is double since it contains doubles.  */
  int c_ucode;			/* Exception no. from u_code */
  /* (this member is not accessible by name since we don't
    portably know the size of fp_stuff.) */
};

struct external_sun3_core {
  int c_magic;			/* Corefile magic number */
  int c_len;			/* Sizeof (struct core) */
#define	SUN3_CORE_LEN	826	/* As of SunOS 4.1.1 */
  int c_regs[18];		/* General purpose registers -- MACHDEP SIZE */
  struct external_exec c_aouthdr;	/* A.out header */
  int c_signo;			/* Killing signal, if any */
  int c_tsize;			/* Text size (bytes) */
  int c_dsize;			/* Data size (bytes) */
  int c_ssize;			/* Stack size (bytes) */
  char c_cmdname[CORE_NAMELEN + 1]; /* Command name */
  double fp_stuff[1];		    /* external FPU state (size unknown by us) */
  /* The type "double" is critical here, for alignment.
    SunOS declares a struct here, but the struct's alignment
      is double since it contains doubles.  */
  int c_ucode;			/* Exception no. from u_code */
  /* (this member is not accessible by name since we don't
    portably know the size of fp_stuff.) */
};

struct internal_sunos_core {
  int c_magic;			/* Corefile magic number */
  int c_len;			/* Sizeof (struct core) */
  long c_regs_pos;		/* file offset of General purpose registers */
  int c_regs_size;		/* size of General purpose registers */
  struct internal_exec c_aouthdr;	/* A.out header */
  int c_signo;			/* Killing signal, if any */
  int c_tsize;			/* Text size (bytes) */
  int c_dsize;			/* Data size (bytes) */
  int c_ssize;			/* Stack size (bytes) */
  long c_stacktop;		/* Stack top (address) */
  char c_cmdname[CORE_NAMELEN + 1]; /* Command name */
  long fp_stuff_pos;		/* file offset of external FPU state (regs) */
  int fp_stuff_size;		/* Size of it */
  int c_ucode;			/* Exception no. from u_code */
};

/* byte-swap in the Sun-3 core structure */
static void
DEFUN(swapcore_sun3,(abfd, ext, intcore),
      bfd *abfd AND
      char *ext;
      struct internal_sunos_core *intcore)
{
  struct external_exec exec_bytes;
  struct external_sun3_core *extcore = (struct external_sun3_core *)ext;
  
  intcore->c_magic = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_magic);
  intcore->c_len   = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_len  );
  intcore->c_regs_pos  = (long) (((struct external_sun3_core *)0)->c_regs);
  intcore->c_regs_size = sizeof (extcore->c_regs);
  NAME(aout,swap_exec_header_in)(abfd, &extcore->c_aouthdr,&intcore->c_aouthdr);
  intcore->c_signo = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_signo);
  intcore->c_tsize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_tsize);
  intcore->c_dsize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_dsize);
  intcore->c_ssize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_ssize);
  bcopy (extcore->c_cmdname, intcore->c_cmdname, sizeof (intcore->c_cmdname));
  intcore->fp_stuff_pos = (long) (((struct external_sun3_core *)0)->fp_stuff);
  /* FP stuff takes up whole rest of struct, except c_ucode. */
  intcore->fp_stuff_size = intcore->c_len - (sizeof extcore->c_ucode) -
    (file_ptr)(((struct external_sun3_core *)0)->fp_stuff);
  /* Ucode is the last thing in the struct -- just before the end */
  intcore->c_ucode = bfd_h_get_32 (abfd, 
	intcore->c_len - sizeof (extcore->c_ucode) + (unsigned char *)extcore);
  intcore->c_stacktop = 0x0E000000;	/* By experimentation */
}


/* byte-swap in the Sun-3 core structure */
static void
DEFUN(swapcore_sparc,(abfd, ext, intcore),
      bfd *abfd AND
      char *ext;
      struct internal_sunos_core *intcore)
{
  struct external_sparc_core *extcore = (struct external_sparc_core *)ext;
  
  intcore->c_magic = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_magic);
  intcore->c_len   = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_len  );
  intcore->c_regs_pos  = (long) (((struct external_sparc_core *)0)->c_regs);
  intcore->c_regs_size = sizeof (extcore->c_regs);
  NAME(aout,swap_exec_header_in)(abfd, &extcore->c_aouthdr,&intcore->c_aouthdr);
  intcore->c_signo = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_signo);
  intcore->c_tsize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_tsize);
  intcore->c_dsize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_dsize);
  intcore->c_ssize = bfd_h_get_32 (abfd, (unsigned char *)&extcore->c_ssize);
  bcopy (extcore->c_cmdname, intcore->c_cmdname, sizeof (intcore->c_cmdname));
  intcore->fp_stuff_pos = (long) (((struct external_sparc_core *)0)->fp_stuff);
  /* FP stuff takes up whole rest of struct, except c_ucode. */
  intcore->fp_stuff_size = intcore->c_len - (sizeof extcore->c_ucode) -
    (file_ptr)(((struct external_sparc_core *)0)->fp_stuff);
  /* Ucode is the last thing in the struct -- just before the end */
  intcore->c_ucode = bfd_h_get_32 (abfd, 
	intcore->c_len - sizeof (extcore->c_ucode) + (unsigned char *)extcore);
  /* Supposedly the user stack grows downward from the bottom of kernel memory.
     Presuming that this remains true, this definition will work. */
#define USRSTACK (-(128*1024*1024))
  intcore->c_stacktop = USRSTACK;	/* By experimentation */
#undef USRSTACK
}

/* need this cast because ptr is really void * */
#define core_hdr(bfd) (((struct suncoredata *) (bfd->tdata))->hdr)
#define core_datasec(bfd) (((struct suncoredata *) ((bfd)->tdata))->data_section)
#define core_stacksec(bfd) (((struct suncoredata*)((bfd)->tdata))->stack_section)
#define core_regsec(bfd) (((struct suncoredata *) ((bfd)->tdata))->reg_section)
#define core_reg2sec(bfd) (((struct suncoredata *) ((bfd)->tdata))->reg2_section)

/* These are stored in the bfd's tdata */
struct suncoredata {
  struct internal_sunos_core *hdr;             /* core file header */
  asection *data_section;
  asection *stack_section;
  asection *reg_section;
  asection *reg2_section;
};

static bfd_target *
DEFUN(sunos4_core_file_p,(abfd),
      bfd *abfd)
{
  unsigned char longbuf[4];	/* Raw bytes of various header fields */
  int core_size;
  int core_mag;
  struct internal_sunos_core *core;
  char *extcore;
  char *rawptr;
  struct mergem {
    struct suncoredata suncoredata;
    struct internal_sunos_core internal_sunos_core;
    char external_core[1];
  } *mergem;
  
  bfd_error = system_call_error;
  
  if (bfd_read ((PTR)longbuf, 1, sizeof (longbuf), abfd) !=
      sizeof (longbuf))
    return 0;
  core_mag = bfd_h_get_32 (abfd, longbuf);

  if (core_mag != CORE_MAGIC) return 0;

  /* SunOS core headers can vary in length; second word is size; */
  if (bfd_read ((PTR)longbuf, 1, sizeof (longbuf), abfd) !=
      sizeof (longbuf))
    return 0;
  core_size = bfd_h_get_32 (abfd, longbuf);
  /* Sanity check */
  if (core_size > 20000)
    return 0;

  if (bfd_seek (abfd, 0L, false) < 0) return 0;

  mergem = (struct mergem *)bfd_zalloc (abfd, core_size + sizeof (struct mergem));
  if (mergem == NULL) {
    bfd_error = no_memory;
    return 0;
  }

  extcore = mergem->external_core;

  if ((bfd_read ((PTR) extcore, 1, core_size, abfd)) != core_size) {
    bfd_error = system_call_error;
    bfd_release (abfd, (char *)mergem);
    return 0;
  }

  /* Validate that it's a core file we know how to handle, due to sun
     botching the positioning of registers and other fields in a machine
     dependent way.  */
  core = &mergem->internal_sunos_core;
  switch (core_size) {
  case SPARC_CORE_LEN:
    swapcore_sparc (abfd, extcore, core);
    break;
  case SUN3_CORE_LEN:
    swapcore_sun3 (abfd, extcore, core);
    break;
  default:
    bfd_error = system_call_error;		/* FIXME */
    bfd_release (abfd, (char *)mergem);
    return 0;
  }

  set_tdata (abfd, &mergem->suncoredata);
  core_hdr (abfd) = core;

  /* create the sections.  This is raunchy, but bfd_close wants to reclaim
     them */
  core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_stacksec (abfd) == NULL) {
  loser:
    bfd_error = no_memory;
    bfd_release (abfd, rawptr);
    return 0;
  }
  core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_datasec (abfd) == NULL) {
  loser1:
    bfd_release (abfd, core_stacksec (abfd));
    goto loser;
  }
  core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_regsec (abfd) == NULL) {
  loser2:
    bfd_release (abfd, core_datasec (abfd));
    goto loser1;
  }
  core_reg2sec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  if (core_reg2sec (abfd) == NULL) {
    bfd_release (abfd, core_regsec (abfd));
    goto loser2;
  }

  core_stacksec (abfd)->name = ".stack";
  core_datasec (abfd)->name = ".data";
  core_regsec (abfd)->name = ".reg";
  core_reg2sec (abfd)->name = ".reg2";

  core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
  core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD;
  core_regsec (abfd)->flags = SEC_ALLOC;
  core_reg2sec (abfd)->flags = SEC_ALLOC;

  core_stacksec (abfd)->size = core->c_ssize;
  core_datasec (abfd)->size = core->c_dsize;
  core_regsec (abfd)->size = core->c_regs_size;
  core_reg2sec (abfd)->size = core->fp_stuff_size;

  core_stacksec (abfd)->vma = (core->c_stacktop - core->c_ssize);
  core_datasec (abfd)->vma = N_DATADDR(core->c_aouthdr);
  core_regsec (abfd)->vma = -1;
  core_reg2sec (abfd)->vma = -1;

  core_stacksec (abfd)->filepos = core->c_len + core->c_dsize;
  core_datasec (abfd)->filepos = core->c_len;
  /* We'll access the regs afresh in the core file, like any section: */
  core_regsec (abfd)->filepos = (file_ptr)core->c_regs_pos;
  core_reg2sec (abfd)->filepos = (file_ptr)core->fp_stuff_pos;

  /* Align to word at least */
  core_stacksec (abfd)->alignment_power = 2;
  core_datasec (abfd)->alignment_power = 2;
  core_regsec (abfd)->alignment_power = 2;
  core_reg2sec (abfd)->alignment_power = 2;

  abfd->sections = core_stacksec (abfd);
  core_stacksec (abfd)->next = core_datasec (abfd);
  core_datasec (abfd)->next = core_regsec (abfd);
  core_regsec (abfd)->next = core_reg2sec (abfd);

  abfd->section_count = 4;

  return abfd->xvec;
}

static char *sunos4_core_file_failing_command (abfd)
bfd *abfd;
  {
  return core_hdr (abfd)->c_cmdname;
}

static int
DEFUN(sunos4_core_file_failing_signal,(abfd),
      bfd *abfd)
{
  return core_hdr (abfd)->c_signo;
}

static boolean
DEFUN(sunos4_core_file_matches_executable_p, (core_bfd, exec_bfd),
      bfd *core_bfd AND
      bfd *exec_bfd)
{
  if (core_bfd->xvec != exec_bfd->xvec) {
    bfd_error = system_call_error;
    return false;
  }

  return (bcmp ((char *)&core_hdr (core_bfd), (char*) &exec_hdr (exec_bfd),
		sizeof (struct internal_exec)) == 0) ? true : false;
}
\f
/* We use BFD generic archive files.  */
#define	aout_32_openr_next_archived_file	bfd_generic_openr_next_archived_file
#define	aout_32_generic_stat_arch_elt		bfd_generic_stat_arch_elt
#define	aout_32_slurp_armap			bfd_slurp_bsd_armap
#define	aout_32_slurp_extended_name_table	bfd_true
#define	aout_32_write_armap			bsd_write_armap
#define	aout_32_truncate_arname			bfd_bsd_truncate_arname
#define aout_32_machine_type 			sunos_machine_type

#define	aout_32_core_file_failing_command 	sunos4_core_file_failing_command
#define	aout_32_core_file_failing_signal	sunos4_core_file_failing_signal
#define	aout_32_core_file_matches_executable_p	sunos4_core_file_matches_executable_p


#define	aout_64_openr_next_archived_file	bfd_generic_openr_next_archived_file
#define	aout_64_generic_stat_arch_elt		bfd_generic_stat_arch_elt
#define	aout_64_slurp_armap			bfd_slurp_bsd_armap
#define	aout_64_slurp_extended_name_table	bfd_true
#define	aout_64_write_armap			bsd_write_armap
#define	aout_64_truncate_arname			bfd_bsd_truncate_arname
#define aout_64_machine_type 			sunos_machine_type

#define	aout_64_core_file_failing_command 	sunos4_core_file_failing_command
#define	aout_64_core_file_failing_signal	sunos4_core_file_failing_signal
#define	aout_64_core_file_matches_executable_p	sunos4_core_file_matches_executable_p

#define aout_64_bfd_debug_info_start		bfd_void
#define aout_64_bfd_debug_info_end		bfd_void
#define aout_64_bfd_debug_info_accumulate	bfd_void

#define aout_32_bfd_debug_info_start		bfd_void
#define aout_32_bfd_debug_info_end		bfd_void
#define aout_32_bfd_debug_info_accumulate	(PROTO(void,(*),(bfd*, struct sec *))) bfd_void



/* We implement these routines ourselves, rather than using the generic
a.out versions.  */
#define	aout_write_object_contents	sunos4_write_object_contents

bfd_target VECNAME =
  {
    TARGETNAME,
    bfd_target_aout_flavour_enum,
    true,			/* target byte order */
    true,			/* target headers byte order */
    (HAS_RELOC | EXEC_P |	/* object flags */
     HAS_LINENO | HAS_DEBUG |
     HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
    (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
    ' ',						   /* ar_pad_char */
    16,							   /* ar_max_namelen */
    3,							   /* minimum alignment power */
    _do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* data */
    _do_getb64, _do_putb64, _do_getb32, _do_putb32, _do_getb16, _do_putb16, /* hdrs */
    
      {_bfd_dummy_target, NAME(sunos,object_p),
       bfd_generic_archive_p, sunos4_core_file_p},
      {bfd_false, NAME(aout,mkobject),
       _bfd_generic_mkarchive, bfd_false},
      {bfd_false, NAME(aout,sunos4_write_object_contents), /* bfd_write_contents */
       _bfd_write_archive_contents, bfd_false},
    
    JUMP_TABLE(JNAME(aout))
    };