aoutf1.h

早期freebsd实现

/* A.out "format 1" file handling code for BFD.
   Copyright 1990, 1991, 1992 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 "bfd.h"
#include "sysdep.h"
#include "libbfd.h"

#include "aout/sun4.h"
#include "libaout.h"           /* BFD a.out internal data structures */

#include "aout/aout64.h"
#include "aout/stab_gnu.h"
#include "aout/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)();

/*SUPPRESS558*/
/*SUPPRESS529*/

void
DEFUN(NAME(sunos,set_arch_mach), (abfd, machtype),
      bfd *abfd AND int machtype)
{
  /* Determine the architecture and machine type of the object file.  */
  enum bfd_architecture arch;
  long machine;
  switch (machtype) {

  case M_UNKNOWN:
      /* Some Sun3s make magic numbers without cpu types in them, so
	 we'll default to the 68020. */
    arch = bfd_arch_m68k;
    machine = 68020;
    break;
    
  case M_68010:
  case M_HP200:
    arch = bfd_arch_m68k;
    machine = 68010;
    break;
    
  case M_68020:
  case M_HP300:
    arch = bfd_arch_m68k;
    machine = 68020;
    break;
    
  case M_SPARC:
    arch = bfd_arch_sparc;
    machine = 0;
    break;
    
  case M_386:
    arch = bfd_arch_i386;
    machine = 0;
    break;
    
  case M_29K:
    arch = bfd_arch_a29k;
    machine = 0;
    break;
    
  case M_HPUX:
    arch = bfd_arch_m68k;
    machine = 0;
    break;

  default:
    arch = bfd_arch_obscure;
    machine = 0;
    break;
  }
  bfd_set_arch_mach(abfd, arch, machine);  
}

#define SET_ARCH_MACH(ABFD, EXEC) \
  NAME(sunos,set_arch_mach)(ABFD, N_MACHTYPE (EXEC)); \
  choose_reloc_size(ABFD);

/* Determine the size of a relocation entry, based on the architecture */
static void
DEFUN(choose_reloc_size,(abfd),
bfd *abfd)
{
  switch (bfd_get_arch(abfd)) {
  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;
  }
}

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

static boolean
DEFUN(NAME(aout,sunos4_write_object_contents),
      (abfd),
      bfd *abfd)
{
  struct external_exec exec_bytes;
  struct internal_exec *execp = exec_hdr (abfd);
    
  /* Magic number, maestro, please!  */
  switch (bfd_get_arch(abfd)) {
  case bfd_arch_m68k:
    switch (bfd_get_mach(abfd)) {
    case 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;
}

/* 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 AND
      struct internal_sunos_core *intcore)
{
  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);