Patch for retaining relocation entries in executable objects

[Momchil Velikov <velco at fadata dot bg>]

Hi, folks.

This patch: 
 * adds the field 'boolean retain_relocs;' to struct bfd_link_info;
 * adds the command line option --retain-relocs to ld -- when given
   sets the above field to true.
 * modifies bfd/elflink.h so the relocation entries are output if
   --retain-relocs is given on the command line.

Without the patch, I was unable to found any other way to execute
multiple processes on platforms without a MMU.

What do you think ?

Regards,
-velco
diff -ur binutils-2.9.5.0.24.orig/bfd/elflink.h binutils-2.9.5.0.24/bfd/elflink.h
--- binutils-2.9.5.0.24.orig/bfd/elflink.h	Thu Jan 13 21:52:34 2000
+++ binutils-2.9.5.0.24/bfd/elflink.h	Mon Mar 06 19:22:00 2000
@@ -4166,7 +4166,7 @@
 		 the linker has decided to not include.  */
 	      sec->linker_mark = true;
 
-	      if (info->relocateable)
+	      if (info->relocateable || info->retain_relocs )
 		o->reloc_count += sec->reloc_count;
 
 	      if (sec->_raw_size > max_contents_size)
@@ -4234,7 +4234,7 @@
   /* Figure out how many relocations we will have in each section.
      Just using RELOC_COUNT isn't good enough since that doesn't
      maintain a separate value for REL vs. RELA relocations.  */
-  if (info->relocateable)
+  if (info->relocateable || info->retain_relocs )
     for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
       for (o = sub->sections; o != NULL; o = o->next)
 	{
@@ -5553,7 +5553,7 @@
 				     finfo->sections))
 	    return false;
 
-	  if (finfo->info->relocateable)
+	  if (finfo->info->relocateable || finfo->info->retain_relocs )
 	    {
 	      Elf_Internal_Rela *irela;
 	      Elf_Internal_Rela *irelaend;
@@ -5574,7 +5574,10 @@
 		  Elf_Internal_Sym *isym;
 		  asection *sec;
 
-		  irela->r_offset += o->output_offset;
+		  if (finfo->info->relocateable )
+		    irela->r_offset += o->output_offset;
+		  else
+		    irela->r_offset += o->output_offset + o->output_section->vma;
 
 		  r_symndx = ELF_R_SYM (irela->r_info);
 
diff -ur binutils-2.9.5.0.24.orig/include/bfdlink.h binutils-2.9.5.0.24/include/bfdlink.h
--- binutils-2.9.5.0.24.orig/include/bfdlink.h	Sun Jun 27 03:03:06 1999
+++ binutils-2.9.5.0.24/include/bfdlink.h	Mon Mar 06 18:43:10 2000
@@ -179,6 +179,8 @@
   const struct bfd_link_callbacks *callbacks;
   /* true if BFD should generate a relocateable object file.  */
   boolean relocateable;
+  /* true if BFD should retain relocation entries even if not generating a relocateable object file.  */
+  boolean retain_relocs;
   /* true if BFD should generate a "task linked" object file,
      similar to relocatable but also with globals converted to statics. */
   boolean task_link;
diff -ur binutils-2.9.5.0.24.orig/ld/ldmain.c binutils-2.9.5.0.24/ld/ldmain.c
--- binutils-2.9.5.0.24.orig/ld/ldmain.c	Thu Jan 13 20:24:40 2000
+++ binutils-2.9.5.0.24/ld/ldmain.c	Mon Mar 06 16:06:38 2000
@@ -215,6 +215,7 @@
 
   link_info.callbacks = &link_callbacks;
   link_info.relocateable = false;
+  link_info.retain_relocs = false;
   link_info.shared = false;
   link_info.symbolic = false;
   link_info.static_link = false;
diff -ur binutils-2.9.5.0.24.orig/ld/lexsup.c binutils-2.9.5.0.24/ld/lexsup.c
--- binutils-2.9.5.0.24.orig/ld/lexsup.c	Sun Oct 10 20:23:22 1999
+++ binutils-2.9.5.0.24/ld/lexsup.c	Mon Mar 06 16:06:02 2000
@@ -89,7 +89,8 @@
 #define OPTION_NO_WHOLE_ARCHIVE		(OPTION_NON_SHARED + 1)
 #define OPTION_OFORMAT			(OPTION_NO_WHOLE_ARCHIVE + 1)
 #define OPTION_RELAX			(OPTION_OFORMAT + 1)
-#define OPTION_RETAIN_SYMBOLS_FILE	(OPTION_RELAX + 1)
+#define OPTION_RETAIN_RELOCS		(OPTION_RELAX + 1)
+#define OPTION_RETAIN_SYMBOLS_FILE	(OPTION_RETAIN_RELOCS + 1)
 #define OPTION_RPATH			(OPTION_RETAIN_SYMBOLS_FILE + 1)
 #define OPTION_RPATH_LINK		(OPTION_RPATH + 1)
 #define OPTION_SHARED			(OPTION_RPATH_LINK + 1)
@@ -317,6 +318,9 @@
       '\0', NULL, N_("Ignored for Linux compatibility"), ONE_DASH },
   { {"relax", no_argument, NULL, OPTION_RELAX},
       '\0', NULL, N_("Relax branches on certain targets"), TWO_DASHES },
+  { {"retain-relocs", no_argument, NULL,
+       OPTION_RETAIN_RELOCS},
+      '\0', NULL, N_("Retain relocations"), TWO_DASHES },
   { {"retain-symbols-file", required_argument, NULL,
        OPTION_RETAIN_SYMBOLS_FILE},
       '\0', N_("FILE"), N_("Keep only symbols listed in FILE"), TWO_DASHES },
@@ -813,6 +817,9 @@
 	  break;
 	case OPTION_RELAX:
 	  command_line.relax = true;
+	  break;
+	case OPTION_RETAIN_RELOCS:
+	  link_info.retain_relocs = true;
 	  break;
 	case OPTION_RETAIN_SYMBOLS_FILE:
 	  add_keepsyms_file (optarg);