19990502 sourceware import

1 files changed, 644 insertions, 0 deletions

diff --git a/bfd/riscix.c b/bfd/riscix.c
new file mode 100644
index 0000000000..f5ab49a692
--- /dev/null
+++ b/bfd/riscix.c
@@ -0,0 +1,644 @@
+/* BFD back-end for RISC iX (Acorn, arm) binaries.
+   Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Contributed by Richard Earnshaw (rwe@pegasus.esprit.ec.org)
+   
+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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+
+/* RISC iX overloads the MAGIC field to indicate more than just the usual
+   [ZNO]MAGIC values.  Also included are squeezing information and
+   shared library usage.  */
+
+/* The following come from the man page.  */
+#define SHLIBLEN 60
+
+#define MF_IMPURE       00200
+#define MF_SQUEEZED     01000
+#define MF_USES_SL      02000
+#define MF_IS_SL        04000
+
+/* Common combinations.  */
+#define IMAGIC          (MF_IMPURE|ZMAGIC)      /* Demand load (impure text) */
+#define SPOMAGIC        (MF_USES_SL|OMAGIC)     /* OMAGIC with large header */
+                                        /* -- may contain a ref to a */
+                                        /* shared lib required by the */
+                                        /* object. */
+#define SLOMAGIC        (MF_IS_SL|OMAGIC) /* A reference to a shared library */
+                                          /* The text portion of the object */
+                                          /* contains "overflow text" from */
+                                          /* the shared library to be linked */
+                                          /* in with an object */
+#define QMAGIC          (MF_SQUEEZED|ZMAGIC)    /* Sqeezed demand paged. */
+                                          /* NOTE: This interpretation of */
+                                          /* QMAGIC seems to be at variance */
+                                          /* With that used on other */
+                                          /* architectures. */
+#define SPZMAGIC        (MF_USES_SL|ZMAGIC)     /* program which uses sl */
+#define SPQMAGIC        (MF_USES_SL|QMAGIC)     /* sqeezed ditto */
+#define SLZMAGIC        (MF_IS_SL|ZMAGIC)       /* shared lib part of prog */
+#define SLPZMAGIC       (MF_USES_SL|SLZMAGIC)   /* sl which uses another */
+
+#define N_SHARED_LIB(x) ((x).a_info & MF_USES_SL)
+
+/* Only a pure OMAGIC file has the minimal header */
+#define N_TXTOFF(x)                     \
+ ((x).a_info == OMAGIC ? 32             \
+  : (N_MAGIC(x) == ZMAGIC) ? TARGET_PAGE_SIZE  \
+  : 999)
+
+#define N_TXTADDR(x)                                                         \
+  (N_MAGIC(x) != ZMAGIC ? 0 /* object file or NMAGIC */                      \
+   /* Programs with shared libs are loaded at the first page after all the   \
+      text segments of the shared library programs.  Without looking this    \
+      up we can't know exactly what the address will be.  A reasonable guess \
+      is that a_entry will be in the first page of the executable.  */       \
+   : N_SHARED_LIB(x) ? ((x).a_entry & ~(TARGET_PAGE_SIZE - 1))                      \
+   : TEXT_START_ADDR)
+
+#define N_SYMOFF(x) \
+  (N_TXTOFF (x) + (x).a_text + (x).a_data + (x).a_trsize + (x).a_drsize)
+
+#define N_STROFF(x) (N_SYMOFF (x) + (x).a_syms)
+
+#define TEXT_START_ADDR 32768
+#define TARGET_PAGE_SIZE 32768
+#define SEGMENT_SIZE TARGET_PAGE_SIZE
+#define DEFAULT_ARCH bfd_arch_arm
+
+#define MY(OP) CAT(riscix_,OP)
+#define TARGETNAME "a.out-riscix"
+#define N_BADMAG(x) ((((x).a_info & ~007200) != ZMAGIC) && \
+                     (((x).a_info & ~006000) != OMAGIC) && \
+                     ((x).a_info != NMAGIC))
+#define N_MAGIC(x) ((x).a_info & ~07200)
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "libbfd.h"
+
+#define WRITE_HEADERS(abfd, execp)					   \
+  {									   \
+    bfd_size_type text_size; /* dummy vars */				   \
+    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);			   \
+    									   \
+    execp->a_trsize = ((obj_textsec (abfd)->reloc_count) *		   \
+		       obj_reloc_entry_size (abfd));			   \
+    execp->a_drsize = ((obj_datasec (abfd)->reloc_count) *		   \
+		       obj_reloc_entry_size (abfd));			   \
+    NAME(aout,swap_exec_header_out) (abfd, execp, &exec_bytes);		   \
+    									   \
+    if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0) return false;	   \
+    if (bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)		   \
+	!= EXEC_BYTES_SIZE)						   \
+      return false;							   \
+    /* Now write out reloc info, followed by syms and strings */	   \
+									   \
+    if (bfd_get_outsymbols (abfd) != (asymbol **) 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 (bfd_seek (abfd, (file_ptr)(N_TRELOFF(*execp)), SEEK_SET) != 0) \
+	  return false;							   \
+									   \
+	if (! riscix_squirt_out_relocs (abfd, obj_textsec (abfd)))	   \
+	  return false;							   \
+	if (bfd_seek (abfd, (file_ptr)(N_DRELOFF(*execp)), SEEK_SET) != 0) \
+	  return false;							   \
+									   \
+	if (!NAME(aout,squirt_out_relocs)(abfd, obj_datasec (abfd)))	   \
+	  return false;							   \
+      }									   \
+  }
+
+#include "libaout.h"
+#include "aout/aout64.h"
+
+static bfd_reloc_status_type
+riscix_fix_pcrel_26_done PARAMS ((bfd *, arelent *, asymbol *, PTR,
+				  asection *, bfd *, char **));
+
+static bfd_reloc_status_type
+riscix_fix_pcrel_26 PARAMS ((bfd *, arelent *, asymbol *, PTR,
+			     asection *, bfd *, char **));
+
+static reloc_howto_type riscix_std_reloc_howto[] = {
+  /* type              rs size bsz  pcrel bitpos ovrf                     sf name     part_inpl readmask  setmask    pcdone */
+  HOWTO( 0,              0,  0,   8,  false, 0, complain_overflow_bitfield,0,"8",        true, 0x000000ff,0x000000ff, false),
+  HOWTO( 1,              0,  1,   16, false, 0, complain_overflow_bitfield,0,"16",        true, 0x0000ffff,0x0000ffff, false),
+  HOWTO( 2,              0,  2,   32, false, 0, complain_overflow_bitfield,0,"32",        true, 0xffffffff,0xffffffff, false),
+  HOWTO( 3,              2,  3,   26, true, 0, complain_overflow_signed,  riscix_fix_pcrel_26 , "ARM26",      true, 0x00ffffff,0x00ffffff, false),
+  HOWTO( 4,              0,  0,   8,  true,  0, complain_overflow_signed,  0,"DISP8",     true, 0x000000ff,0x000000ff, true),
+  HOWTO( 5,              0,  1,   16, true,  0, complain_overflow_signed,  0,"DISP16",    true, 0x0000ffff,0x0000ffff, true),
+  HOWTO( 6,              0,  2,   32, true,  0, complain_overflow_signed,  0,"DISP32",    true, 0xffffffff,0xffffffff, true),
+  HOWTO( 7,              2,  3,   26, false, 0, complain_overflow_signed,  riscix_fix_pcrel_26_done, "ARM26D",true,0x00ffffff,0x00ffffff, false),
+  {-1},
+  HOWTO( 9,              0, -1,   16, false, 0, complain_overflow_bitfield,0,"NEG16",        true, 0x0000ffff,0x0000ffff, false),
+  HOWTO( 10,              0, -2,   32, false, 0, complain_overflow_bitfield,0,"NEG32",        true, 0xffffffff,0xffffffff, false)
+};
+
+#define RISCIX_TABLE_SIZE \
+  (sizeof (riscix_std_reloc_howto) / sizeof (reloc_howto_type))
+
+
+static bfd_reloc_status_type
+riscix_fix_pcrel_26_done (abfd, reloc_entry, symbol, data, input_section,
+			  output_bfd, error_message)
+     bfd *abfd;
+     arelent *reloc_entry;
+     asymbol *symbol;
+     PTR data;
+     asection *input_section;
+     bfd *output_bfd;
+     char **error_message;
+{
+  /* This is dead simple at present.  */
+  return bfd_reloc_ok;
+}
+
+static bfd_reloc_status_type
+riscix_fix_pcrel_26 (abfd, reloc_entry, symbol, data, input_section,
+		     output_bfd, error_message)
+     bfd *abfd;
+     arelent *reloc_entry;
+     asymbol *symbol;
+     PTR data;
+     asection *input_section;
+     bfd *output_bfd;
+     char **error_message;
+{
+  bfd_vma relocation;
+  bfd_size_type addr = reloc_entry->address;
+  long target = bfd_get_32 (abfd, (bfd_byte *) data + addr);
+  bfd_reloc_status_type flag = bfd_reloc_ok;
+  
+  /* If this is an undefined symbol, return error */
+  if (symbol->section == &bfd_und_section
+      && (symbol->flags & BSF_WEAK) == 0)
+    return output_bfd ? bfd_reloc_continue : bfd_reloc_undefined;
+
+  /* If the sections are different, and we are doing a partial relocation,
+     just ignore it for now.  */
+  if (symbol->section->name != input_section->name
+      && output_bfd != (bfd *)NULL)
+    return bfd_reloc_continue;
+
+  relocation = (target & 0x00ffffff) << 2;
+  relocation = (relocation ^ 0x02000000) - 0x02000000; /* Sign extend */
+  relocation += symbol->value;
+  relocation += symbol->section->output_section->vma;
+  relocation += symbol->section->output_offset;
+  relocation += reloc_entry->addend;
+  relocation -= input_section->output_section->vma;
+  relocation -= input_section->output_offset;
+  relocation -= addr;
+  if (relocation & 3)
+    return bfd_reloc_overflow;
+
+  /* Check for overflow */
+  if (relocation & 0x02000000)
+    {
+      if ((relocation & ~ (bfd_vma) 0x03ffffff) != ~ (bfd_vma) 0x03ffffff)
+	flag = bfd_reloc_overflow;
+    }
+  else if (relocation & ~0x03ffffff)
+    flag = bfd_reloc_overflow;
+
+  target &= ~0x00ffffff;
+  target |= (relocation >> 2) & 0x00ffffff;
+  bfd_put_32 (abfd, target, (bfd_byte *) data + addr);
+
+  /* Now the ARM magic... Change the reloc type so that it is marked as done.
+     Strictly this is only necessary if we are doing a partial relocation.  */
+  reloc_entry->howto = &riscix_std_reloc_howto[7];
+  
+  return flag;
+}
+
+reloc_howto_type *
+DEFUN(riscix_reloc_type_lookup,(abfd,code),
+      bfd *abfd AND
+      bfd_reloc_code_real_type code)
+{
+#define ASTD(i,j)       case i: return &riscix_std_reloc_howto[j]
+  if (code == BFD_RELOC_CTOR)
+    switch (bfd_get_arch_info (abfd)->bits_per_address)
+      {
+      case 32:
+        code = BFD_RELOC_32;
+        break;
+      default: return (reloc_howto_type *) NULL;
+      }
+
+  switch (code)
+    {
+      ASTD (BFD_RELOC_16, 1);
+      ASTD (BFD_RELOC_32, 2);
+      ASTD (BFD_RELOC_ARM_PCREL_BRANCH, 3);
+      ASTD (BFD_RELOC_8_PCREL, 4);
+      ASTD (BFD_RELOC_16_PCREL, 5);
+      ASTD (BFD_RELOC_32_PCREL, 6);
+    default: return (reloc_howto_type *) NULL;
+    }
+}
+
+#define MY_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
+#define MY_bfd_link_add_symbols _bfd_generic_link_add_symbols
+#define MY_final_link_callback should_not_be_used
+#define MY_bfd_final_link _bfd_generic_final_link
+
+#define MY_bfd_reloc_type_lookup riscix_reloc_type_lookup
+#define MY_canonicalize_reloc riscix_canonicalize_reloc
+#define MY_object_p riscix_object_p
+
+static const bfd_target *riscix_callback PARAMS ((bfd *));
+
+void
+riscix_swap_std_reloc_out (abfd, g, natptr)
+     bfd *abfd;
+     arelent *g;
+     struct reloc_std_external *natptr;
+{
+  int r_index;
+  asymbol *sym = *(g->sym_ptr_ptr);
+  int r_extern;
+  int r_length;
+  int r_pcrel;
+  int r_neg = 0;	/* Negative relocs use the BASEREL bit.  */
+  asection *output_section = sym->section->output_section;
+
+  PUT_WORD(abfd, g->address, natptr->r_address);
+
+  r_length = g->howto->size ;   /* Size as a power of two */
+  if (r_length < 0)
+    {
+      r_length = -r_length;
+      r_neg = 1;
+    }
+
+  r_pcrel  = (int) g->howto->pc_relative; /* Relative to PC? */
+
+  /* For RISC iX, in pc-relative relocs the r_pcrel bit means that the
+     relocation has been done already (Only for the 26-bit one I think)???!!!
+     */
+  
+  if (r_length == 3)
+    r_pcrel = r_pcrel ? 0 : 1;
+  
+
+#if 0
+  /* For a standard reloc, the addend is in the object file.  */
+  r_addend = g->addend + (*(g->sym_ptr_ptr))->section->output_section->vma;
+#endif
+
+  /* name was clobbered by aout_write_syms to be symbol index */
+
+  /* If this relocation is relative to a symbol then set the
+     r_index to the symbols index, and the r_extern bit.
+
+     Absolute symbols can come in in two ways, either as an offset
+     from the abs section, or as a symbol which has an abs value.
+     check for that here
+     */
+
+  if (bfd_is_com_section (output_section)
+      || output_section == &bfd_abs_section
+      || output_section == &bfd_und_section)
+    {
+      if (bfd_abs_section.symbol == sym)
+	{
+	  /* Whoops, looked like an abs symbol, but is really an offset
+	     from the abs section */
+	  r_index = 0;
+	  r_extern = 0;
+	}
+      else
+	{
+	  /* Fill in symbol */
+	  r_extern = 1;
+	  r_index = (*g->sym_ptr_ptr)->udata.i;
+	}
+    }
+  else
+    {
+      /* Just an ordinary section */
+      r_extern = 0;
+      r_index  = output_section->target_index;
+    }
+
+  /* now the fun stuff */
+  if (bfd_header_big_endian (abfd))
+    {
+      natptr->r_index[0] = r_index >> 16;
+      natptr->r_index[1] = r_index >> 8;
+      natptr->r_index[2] = r_index;
+      natptr->r_type[0] =
+	(  (r_extern ?   RELOC_STD_BITS_EXTERN_BIG: 0)
+	 | (r_pcrel  ?   RELOC_STD_BITS_PCREL_BIG: 0)
+	 | (r_neg    ?   RELOC_STD_BITS_BASEREL_BIG: 0)
+	 | (r_length <<  RELOC_STD_BITS_LENGTH_SH_BIG));
+    }
+  else
+    {
+      natptr->r_index[2] = r_index >> 16;
+      natptr->r_index[1] = r_index >> 8;
+      natptr->r_index[0] = r_index;
+      natptr->r_type[0] =
+	(  (r_extern ?   RELOC_STD_BITS_EXTERN_LITTLE: 0)
+	 | (r_pcrel  ?   RELOC_STD_BITS_PCREL_LITTLE: 0)
+	 | (r_neg    ?   RELOC_STD_BITS_BASEREL_LITTLE: 0)
+	 | (r_length <<  RELOC_STD_BITS_LENGTH_SH_LITTLE));
+    }
+}
+
+boolean
+riscix_squirt_out_relocs (abfd, section)
+     bfd *abfd;
+     asection *section;
+{
+  arelent **generic;
+  unsigned char *native, *natptr;
+  size_t each_size;
+  
+  unsigned int count = section->reloc_count;
+  size_t natsize;
+
+  if (count == 0) return true;
+
+  each_size = obj_reloc_entry_size (abfd);
+  natsize = each_size * count;
+  native = (unsigned char *) bfd_zalloc (abfd, natsize);
+  if (!native)
+    return false;
+
+  generic = section->orelocation;
+
+  for (natptr = native;
+       count != 0;
+       --count, natptr += each_size, ++generic)
+    riscix_swap_std_reloc_out (abfd, *generic,
+			       (struct reloc_std_external *) natptr);
+
+  if ( bfd_write ((PTR) native, 1, natsize, abfd) != natsize)
+    {
+      bfd_release(abfd, native);
+      return false;
+    }
+
+  bfd_release (abfd, native);
+  return true;
+}
+
+
+/*
+ * This is just like the standard aoutx.h version but we need to do our
+ * own mapping of external reloc type values to howto entries.
+ */
+long
+MY(canonicalize_reloc)(abfd, section, relptr, symbols)
+      bfd *abfd;
+      sec_ptr section;
+      arelent **relptr;
+      asymbol **symbols;
+{
+  arelent *tblptr = section->relocation;
+  unsigned int count, c;
+  extern reloc_howto_type NAME(aout,std_howto_table)[];
+
+  /* If we have already read in the relocation table, return the values. */
+  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;
+    }
+    *relptr = 0;
+    return section->reloc_count;
+  }
+  if (tblptr && section->reloc_count) {
+    for (count = 0; count++ < section->reloc_count;)
+      *relptr++ = tblptr++;
+    *relptr = 0;
+    return section->reloc_count;
+  }
+
+  if (!NAME(aout,slurp_reloc_table)(abfd, section, symbols))
+    return -1;
+  tblptr = section->relocation;
+
+  /* fix up howto entries */
+  for (count = 0; count++ < section->reloc_count;)
+    {
+      c = tblptr->howto - NAME(aout,std_howto_table);
+      BFD_ASSERT (c < RISCIX_TABLE_SIZE);
+      tblptr->howto = &riscix_std_reloc_howto[c];
+
+      *relptr++ = tblptr++;
+    }
+  *relptr = 0;
+  return section->reloc_count;
+}
+
+/* This is the same as NAME(aout,some_aout_object_p), but has different 
+   expansions of the macro definitions.  */
+
+const bfd_target *
+riscix_some_aout_object_p (abfd, execp, callback_to_real_object_p)
+     bfd *abfd;
+     struct internal_exec *execp;
+     const bfd_target *(*callback_to_real_object_p) PARAMS ((bfd *));
+{
+  struct aout_data_struct *rawptr, *oldrawptr;
+  const bfd_target *result;
+
+  rawptr = ((struct aout_data_struct  *) 
+	    bfd_zalloc (abfd, sizeof (struct aout_data_struct )));
+
+  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 ((execp->a_info & MF_SQUEEZED) != 0) /* Squeezed files aren't supported 
+					     (yet)! */
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+  else if ((execp->a_info & MF_IS_SL) != 0)	/* Nor are shared libraries */
+    {
+      bfd_set_error (bfd_error_wrong_format);
+      return NULL;
+    }
+  else 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) = (aout_symbol_type *)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_STD_SIZE;
+
+  /* The default symbol entry size is that of traditional Unix. */
+  obj_symbol_entry_size (abfd) = EXTERNAL_NLIST_SIZE;
+
+  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)->_raw_size = execp->a_data;
+  obj_bsssec (abfd)->_raw_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;
+
+  result = (*callback_to_real_object_p)(abfd);
+
+#if defined(MACH) || defined(STAT_FOR_EXEC)
+  /* 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.
+   */
+  {
+    struct stat stat_buf;
+    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;
+  }
+#else /* ! MACH */
+  /* 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.)
+
+     At some point we should probably break down and stat the file and
+     declare it executable if (one of) its 'x' bits are on...  */
+  if ((execp->a_entry >= obj_textsec(abfd)->vma) &&
+      (execp->a_entry < obj_textsec(abfd)->vma + obj_textsec(abfd)->_raw_size))
+    abfd->flags |= EXEC_P;
+#endif /* MACH */
+  if (result)
+    {
+    }
+  else
+    {
+      free (rawptr);
+      abfd->tdata.aout_data = oldrawptr;
+    }
+  return result;
+}
+
+
+static const bfd_target *
+MY(object_p) (abfd)
+     bfd *abfd;
+{
+  struct external_exec exec_bytes;      /* Raw exec header from file */
+  struct internal_exec exec;            /* Cleaned-up exec header */
+  const bfd_target *target;
+
+  if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
+      != EXEC_BYTES_SIZE) {
+    if (bfd_get_error () != bfd_error_system_call)
+      bfd_set_error (bfd_error_wrong_format);
+    return 0;
+  }
+
+  exec.a_info = bfd_h_get_32 (abfd, exec_bytes.e_info);
+
+  if (N_BADMAG (exec)) return 0;
+#ifdef MACHTYPE_OK
+  if (!(MACHTYPE_OK (N_MACHTYPE (exec)))) return 0;
+#endif
+
+  NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
+
+  target = riscix_some_aout_object_p (abfd, &exec, MY(callback));
+
+  return target;
+}
+
+
+#include "aout-target.h"