add support for embedded relocs in m68k ELF port

1 files changed, 154 insertions, 0 deletions

diff --git a/ld/emultempl/m68kelf.em b/ld/emultempl/m68kelf.em
new file mode 100644
index 0000000000..a5e0373361
--- /dev/null
+++ b/ld/emultempl/m68kelf.em
@@ -0,0 +1,154 @@
+# This shell script emits a C file. -*- C -*-
+#   Copyright (C) 2000 Free Software Foundation, Inc.
+#   Written by Michael Sokolov <msokolov@ivan.Harhan.ORG>, based on armelf.em
+#
+# 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.
+#
+
+# This file is sourced from elf32.em, and defines extra m68k ELF
+# specific routines.
+#
+cat >>e${EMULATION_NAME}.c <<EOF
+
+static void m68k_elf_after_open PARAMS((void));
+static void check_sections PARAMS ((bfd *, asection *, PTR));
+static void m68k_elf_after_allocation PARAMS ((void));
+
+/* This function is run after all the input files have been opened.
+   We create a .emreloc section for each input file with a non zero
+   .data section.  The BFD backend will fill in these sections with
+   magic numbers which can be used to relocate the data section at run
+   time.  */
+
+static void
+m68k_elf_after_open ()
+{
+  bfd *abfd;
+
+  /* Call the standard elf routine.  */
+  gld${EMULATION_NAME}_after_open ();
+
+  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 ELF. It
+         better be, as we are directly calling a ELF backend function.  */
+      if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
+	einfo ("%F%B: all input objects must be ELF 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
+m68k_elf_after_allocation ()
+{
+  bfd *abfd;
+
+  /* Call the standard elf routine.  */
+  gld${EMULATION_NAME}_before_allocation ();
+
+  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_elf32_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);
+	}
+    }
+}
+
+EOF
+
+# We have our own after_open and after_allocation functions, but they call
+# the standard routines, so give them a different name.
+LDEMUL_AFTER_OPEN=m68k_elf_after_open
+LDEMUL_AFTER_ALLOCATION=m68k_elf_after_allocation