Applied Michael's Sokolov's patch to implement --embedded-relocs for m68k coff.

1 files changed, 245 insertions, 0 deletions

diff --git a/ld/emultempl/m68kcoff.em b/ld/emultempl/m68kcoff.em
new file mode 100644
index 0000000..06422d3
--- /dev/null
+++ b/ld/emultempl/m68kcoff.em
@@ -0,0 +1,245 @@
+# This shell script emits a C file. -*- C -*-
+# It does some substitutions.
+cat >e${EMULATION_NAME}.c <<EOF
+/* This file is is generated by a shell script.  DO NOT EDIT! */
+
+/* Handle embedded relocs for m68k.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on generic.em
+   by Steve Chamberlain <steve@cygnus.com>, embedded relocs code based on
+   mipsecoff.em by Ian Lance Taylor <ian@cygnus.com>.
+
+This file is part of GLD, the Gnu Linker.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#define TARGET_IS_${EMULATION_NAME}
+
+#include "bfd.h"
+#include "sysdep.h"
+#include "bfdlink.h"
+
+#include "ld.h"
+#include "ldmain.h"
+#include "ldemul.h"
+#include "ldfile.h"
+#include "ldmisc.h"
+
+static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
+static void gld${EMULATION_NAME}_after_open PARAMS ((void));
+static void check_sections PARAMS ((bfd *, asection *, PTR));
+static void gld${EMULATION_NAME}_after_allocation PARAMS ((void));
+static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));
+
+static void
+gld${EMULATION_NAME}_before_parse ()
+{
+#ifndef TARGET_			/* I.e., if not generic.  */
+  ldfile_set_output_arch ("`echo ${ARCH}`");
+#endif /* not TARGET_ */
+}
+
+/* This function is run after all the input files have been opened.
+   We create a .emreloc section for each input file with a non zero
+   .data section.  The BFD backend will fill in these sections with
+   magic numbers which can be used to relocate the data section at run
+   time.  */
+
+static void
+gld${EMULATION_NAME}_after_open ()
+{
+  bfd *abfd;
+
+  if (! command_line.embedded_relocs
+      || link_info.relocateable)
+    return;
+
+  for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
+    {
+      asection *datasec;
+
+      /* As first-order business, make sure that each input BFD is COFF. It
+         better be, as we are directly calling a COFF backend function.  */
+      if (bfd_get_flavour (abfd) != bfd_target_coff_flavour)
+	einfo ("%F%B: all input objects must be COFF for --embedded-relocs\n");
+
+      datasec = bfd_get_section_by_name (abfd, ".data");
+
+      /* Note that we assume that the reloc_count field has already
+         been set up.  We could call bfd_get_reloc_upper_bound, but
+         that returns the size of a memory buffer rather than a reloc
+         count.  We do not want to call bfd_canonicalize_reloc,
+         because although it would always work it would force us to
+         read in the relocs into BFD canonical form, which would waste
+         a significant amount of time and memory.  */
+      if (datasec != NULL && datasec->reloc_count > 0)
+	{
+	  asection *relsec;
+
+	  relsec = bfd_make_section (abfd, ".emreloc");
+	  if (relsec == NULL
+	      || ! bfd_set_section_flags (abfd, relsec,
+					  (SEC_ALLOC
+					   | SEC_LOAD
+					   | SEC_HAS_CONTENTS
+					   | SEC_IN_MEMORY))
+	      || ! bfd_set_section_alignment (abfd, relsec, 2)
+	      || ! bfd_set_section_size (abfd, relsec,
+					 datasec->reloc_count * 12))
+	    einfo ("%F%B: can not create .emreloc section: %E\n");
+	}
+
+      /* Double check that all other data sections are empty, as is
+         required for embedded PIC code.  */
+      bfd_map_over_sections (abfd, check_sections, (PTR) datasec);
+    }
+}
+
+/* Check that of the data sections, only the .data section has
+   relocs.  This is called via bfd_map_over_sections.  */
+
+static void
+check_sections (abfd, sec, datasec)
+     bfd *abfd;
+     asection *sec;
+     PTR datasec;
+{
+  if ((bfd_get_section_flags (abfd, sec) & SEC_DATA)
+      && sec != (asection *) datasec
+      && sec->reloc_count != 0)
+    einfo ("%B%X: section %s has relocs; can not use --embedded-relocs\n",
+	   abfd, bfd_get_section_name (abfd, sec));
+}
+
+/* This function is called after the section sizes and offsets have
+   been set.  If we are generating embedded relocs, it calls a special
+   BFD backend routine to do the work.  */
+
+static void
+gld${EMULATION_NAME}_after_allocation ()
+{
+  bfd *abfd;
+
+  if (! command_line.embedded_relocs
+      || link_info.relocateable)
+    return;
+
+  for (abfd = link_info.input_bfds; abfd != NULL; abfd = abfd->link_next)
+    {
+      asection *datasec, *relsec;
+      char *errmsg;
+
+      datasec = bfd_get_section_by_name (abfd, ".data");
+
+      if (datasec == NULL || datasec->reloc_count == 0)
+	continue;
+
+      relsec = bfd_get_section_by_name (abfd, ".emreloc");
+      ASSERT (relsec != NULL);
+
+      if (! bfd_m68k_coff_create_embedded_relocs (abfd, &link_info,
+						   datasec, relsec,
+						   &errmsg))
+	{
+	  if (errmsg == NULL)
+	    einfo ("%B%X: can not create runtime reloc information: %E\n",
+		   abfd);
+	  else
+	    einfo ("%X%B: can not create runtime reloc information: %s\n",
+		   abfd, errmsg);
+	}
+    }
+}
+
+static char *
+gld${EMULATION_NAME}_get_script(isfile)
+     int *isfile;
+EOF
+
+if test -n "$COMPILE_IN"
+then
+# Scripts compiled in.
+
+# sed commands to quote an ld script as a C string.
+sc="-f stringify.sed"
+
+cat >>e${EMULATION_NAME}.c <<EOF
+{			     
+  *isfile = 0;
+
+  if (link_info.relocateable == true && config.build_constructors == true)
+    return
+EOF
+sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
+echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
+echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
+echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
+echo '  ; else return'                                     >> e${EMULATION_NAME}.c
+sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
+echo '; }'                                                 >> e${EMULATION_NAME}.c
+
+else
+# Scripts read from the filesystem.
+
+cat >>e${EMULATION_NAME}.c <<EOF
+{			     
+  *isfile = 1;
+
+  if (link_info.relocateable == true && config.build_constructors == true)
+    return "ldscripts/${EMULATION_NAME}.xu";
+  else if (link_info.relocateable == true)
+    return "ldscripts/${EMULATION_NAME}.xr";
+  else if (!config.text_read_only)
+    return "ldscripts/${EMULATION_NAME}.xbn";
+  else if (!config.magic_demand_paged)
+    return "ldscripts/${EMULATION_NAME}.xn";
+  else
+    return "ldscripts/${EMULATION_NAME}.x";
+}
+EOF
+
+fi
+
+cat >>e${EMULATION_NAME}.c <<EOF
+
+struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
+{
+  gld${EMULATION_NAME}_before_parse,
+  syslib_default,
+  hll_default,
+  after_parse_default,
+  gld${EMULATION_NAME}_after_open,
+  gld${EMULATION_NAME}_after_allocation,
+  set_output_arch_default,
+  ldemul_default_target,
+  before_allocation_default,
+  gld${EMULATION_NAME}_get_script,
+  "${EMULATION_NAME}",
+  "${OUTPUT_FORMAT}",
+  NULL,	/* finish */
+  NULL,	/* create output section statements */
+  NULL,	/* open dynamic archive */
+  NULL,	/* place orphan */
+  NULL,	/* set symbols */
+  NULL,	/* parse args */
+  NULL,	/* unrecognized file */
+  NULL,	/* list options */
+  NULL,	/* recognized file */
+  NULL 	/* find_potential_libraries */
+};
+EOF