kvx: New port.

1 files changed, 316 insertions, 0 deletions

diff --git a/ld/emultempl/kvxelf.em b/ld/emultempl/kvxelf.em
new file mode 100644
index 0000000..16e36c5
--- /dev/null
+++ b/ld/emultempl/kvxelf.em
@@ -0,0 +1,316 @@
+# This shell script emits a C file. -*- C -*-
+#   Copyright (C) 2009-2023 Free Software Foundation, Inc.
+#   Contributed by Kalray Inc.
+#
+# This file is part of the GNU Binutils.
+#
+# 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 3 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; see the file COPYING3. If not,
+# see <http://www.gnu.org/licenses/>.
+#
+
+# This file is sourced from elf32.em, and defines extra kvx-elf
+# specific routines.
+#
+fragment <<EOF
+
+#include "ldctor.h"
+#include "elf/kvx.h"
+#include "elfxx-kvx.h"
+
+
+static void
+elf${ELFSIZE}_kvx_before_allocation (void)
+{
+EOF
+if test x"${EMULATION_NAME}" != x"elf64kvx_linux"; then
+fragment <<EOF
+  if (bfd_link_pie (&link_info)) {
+          einfo (_("%F:%P: -pie not supported\n"));
+  }
+EOF
+fi
+fragment <<EOF
+
+  /* Call the standard elf routine.  */
+  gld${EMULATION_NAME}_before_allocation ();
+}
+
+
+
+/* Fake input file for stubs.  */
+static lang_input_statement_type *stub_file;
+
+/* Whether we need to call gldarm_layout_sections_again.  */
+static int need_laying_out = 0;
+
+/* Maximum size of a group of input sections that can be handled by
+   one stub section.  A value of +/-1 indicates the bfd back-end
+   should use a suitable default size.  */
+static bfd_signed_vma group_size = -1;
+
+struct hook_stub_info
+{
+  lang_statement_list_type add;
+  asection *input_section;
+};
+
+/* Traverse the linker tree to find the spot where the stub goes.  */
+
+static bool
+hook_in_stub (struct hook_stub_info *info, lang_statement_union_type **lp)
+{
+  lang_statement_union_type *l;
+  bool ret;
+
+  for (; (l = *lp) != NULL; lp = &l->header.next)
+    {
+      switch (l->header.type)
+	{
+	case lang_constructors_statement_enum:
+	  ret = hook_in_stub (info, &constructor_list.head);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_output_section_statement_enum:
+	  ret = hook_in_stub (info,
+                  &l->output_section_statement.children.head);
+
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_wild_statement_enum:
+	  ret = hook_in_stub (info, &l->wild_statement.children.head);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_group_statement_enum:
+	  ret = hook_in_stub (info, &l->group_statement.children.head);
+	  if (ret)
+	    return ret;
+	  break;
+
+	case lang_input_section_enum:
+	  if (l->input_section.section == info->input_section)
+            {
+	      /* We've found our section.  Insert the stub immediately
+		 after its associated input section.  */
+	      *(info->add.tail) = l->header.next;
+	      l->header.next = info->add.head;
+	      return true;
+	    }
+
+	  break;
+
+	case lang_data_statement_enum:
+	case lang_reloc_statement_enum:
+	case lang_object_symbols_statement_enum:
+	case lang_output_statement_enum:
+	case lang_target_statement_enum:
+	case lang_input_statement_enum:
+	case lang_assignment_statement_enum:
+	case lang_padding_statement_enum:
+	case lang_address_statement_enum:
+	case lang_fill_statement_enum:
+	  break;
+
+	default:
+	  FAIL ();
+	  break;
+	}
+    }
+  return false;
+}
+
+
+/* Call-back for elf${ELFSIZE}_kvx_size_stubs.  */
+
+/* Create a new stub section, and arrange for it to be linked
+   immediately after INPUT_SECTION.  */
+
+static asection *
+elf${ELFSIZE}_kvx_add_stub_section (const char *stub_sec_name,
+                                    asection *input_section)
+{
+  asection *stub_sec;
+  flagword flags;
+  asection *output_section;
+  lang_output_section_statement_type *os;
+  struct hook_stub_info info;
+
+  flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE
+	   | SEC_HAS_CONTENTS | SEC_RELOC | SEC_IN_MEMORY | SEC_KEEP);
+  stub_sec = bfd_make_section_anyway_with_flags (stub_file->the_bfd,
+						 stub_sec_name, flags);
+  if (stub_sec == NULL)
+    goto err_ret;
+
+  bfd_set_section_alignment (stub_sec, 2);
+
+  output_section = input_section->output_section;
+  os = lang_output_section_get (output_section);
+
+  info.input_section = input_section;
+  lang_list_init (&info.add);
+  lang_add_section (&info.add, stub_sec, NULL, NULL, os);
+
+  if (info.add.head == NULL)
+    goto err_ret;
+
+  if (hook_in_stub (&info, &os->children.head))
+    return stub_sec;
+
+ err_ret:
+  einfo ("%X%P: can not make stub section: %E\n");
+  return NULL;
+}
+
+/* Another call-back for elf${ELFSIZE}_kvx_size_stubs.  */
+
+static void
+gldkvx_layout_sections_again (void)
+{
+  /* If we have changed sizes of the stub sections, then we need
+     to recalculate all the section offsets.  This may mean we need to
+     add even more stubs.  */
+  ldelf_map_segments (true);
+  need_laying_out = -1;
+}
+
+static void
+build_section_lists (lang_statement_union_type *statement)
+{
+  if (statement->header.type == lang_input_section_enum)
+    {
+      asection *i = statement->input_section.section;
+
+      if (!((lang_input_statement_type *) i->owner->usrdata)->flags.just_syms
+	  && (i->flags & SEC_EXCLUDE) == 0
+	  && i->output_section != NULL
+	  && i->output_section->owner == link_info.output_bfd)
+	elf${ELFSIZE}_kvx_next_input_section (& link_info, i);
+    }
+}
+
+static void
+gld${EMULATION_NAME}_after_allocation (void)
+{
+  int ret;
+
+  /* bfd_elf32_discard_info just plays with debugging sections,
+     ie. doesn't affect any code, so we can delay resizing the
+     sections.  It's likely we'll resize everything in the process of
+     adding stubs.  */
+  ret = bfd_elf_discard_info (link_info.output_bfd, & link_info);
+  if (ret < 0)
+    {
+      einfo ("%X%P: .eh_frame/.stab edit: %E\n");
+      return;
+    }
+  else if (ret > 0)
+    need_laying_out = 1;
+
+  /* If generating a relocatable output file, then we don't
+     have to examine the relocs.  */
+  if (stub_file != NULL && !bfd_link_relocatable (&link_info))
+    {
+      ret = elf${ELFSIZE}_kvx_setup_section_lists (link_info.output_bfd,
+						       &link_info);
+      if (ret != 0)
+	{
+	  if (ret < 0)
+	    {
+	      einfo ("%X%P: could not compute sections lists for stub generation: %E\n");
+	      return;
+	    }
+
+	  lang_for_each_statement (build_section_lists);
+
+	  /* Call into the BFD backend to do the real work.  */
+	  if (! elf${ELFSIZE}_kvx_size_stubs (link_info.output_bfd,
+					  stub_file->the_bfd,
+					  & link_info,
+					  group_size,
+					  & elf${ELFSIZE}_kvx_add_stub_section,
+					  & gldkvx_layout_sections_again))
+	    {
+	      einfo ("%X%P: cannot size stub section: %E\n");
+	      return;
+	    }
+	}
+    }
+
+  if (need_laying_out != -1)
+    ldelf_map_segments (need_laying_out);
+}
+
+static void
+gld${EMULATION_NAME}_finish (void)
+{
+  if (!bfd_link_relocatable (&link_info))
+    {
+      /* Now build the linker stubs.  */
+      if (stub_file != NULL
+	  && stub_file->the_bfd->sections != NULL)
+	{
+	  if (! elf${ELFSIZE}_kvx_build_stubs (& link_info))
+	    einfo ("%X%P: can not build stubs: %E\n");
+	}
+    }
+
+  finish_default ();
+}
+
+/* This is a convenient point to tell BFD about target specific flags.
+   After the output has been created, but before inputs are read.  */
+static void
+kvx_elf_create_output_section_statements (void)
+{
+  if (!(bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour
+        && elf_object_id (link_info.output_bfd) == KVX_ELF_DATA))
+    return;
+
+  stub_file = lang_add_input_file ("linker stubs",
+				   lang_input_file_is_fake_enum,
+				   NULL);
+  stub_file->the_bfd = bfd_create ("linker stubs", link_info.output_bfd);
+  if (stub_file->the_bfd == NULL
+      || ! bfd_set_arch_mach (stub_file->the_bfd,
+			      bfd_get_arch (link_info.output_bfd),
+			      bfd_get_mach (link_info.output_bfd)))
+    {
+      einfo ("%X%P: can not create BFD %E\n");
+      return;
+    }
+
+  stub_file->the_bfd->flags |= BFD_LINKER_CREATED;
+  ldlang_add_file (stub_file);
+
+  if (!kvx_elf${ELFSIZE}_init_stub_bfd (&link_info, stub_file->the_bfd))
+    einfo ("%F%P: can not init BFD: %E\n");
+}
+
+
+#define lang_for_each_input_file kvx_lang_for_each_input_file
+
+EOF
+
+LDEMUL_BEFORE_ALLOCATION=elf${ELFSIZE}_kvx_before_allocation
+LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=kvx_elf_create_output_section_statements
+
+# Call the extra arm-elf function
+LDEMUL_FINISH=gld${EMULATION_NAME}_finish