--split-by-reloc, --split-by-file extensions. --unique option.

ld/ChangeLog

@@ -1,3 +1,33 @@
+2000-09-05  Alan Modra  <alan@linuxcare.com.au>
+
+	* ld.h (ld_config_type): Add unique_orphan_sections.
+	* lexsup.c (OPTION_UNIQUE): Define.
+	(ld_options): Add "--unique".
+	(parse_args): Handle it.
+	* emultempl/elf32.em (gld${EMULATION_NAME}_place_orphan): Don't
+	search for an existing output section if unique_orphan_sections is
+	set.  Make use of bfd_get_unique_section_name rather than
+	duplicating code here.
+	* ld.texinfo: Describe --unique.
+
+	* lexsup.c (ld_options): Make split-by-reloc arg optional. Add
+	optional arg to split-by-file.
+	(parse_args): Handle them.
+	* ld.texinfo: Update description of these options.
+	* ldwrite.c (clone_section): Pass in the section name.  Replace
+	local code with bfd_get_unique_section_name.
+	(split_sections): Tidy code and comments.  Use a list traversal
+	more appropriate to the list construction.  Handle cooked section
+	sizes.  Split when split_by_reloc reached rather than exceeded.
+	Track section size and split when split_by_file reached.  Fix
+	link_order_tail (even though it's not used).
+	(ldwrite): Modify condition for calling split_sections to suit
+	changed split_by_reloc and split_by_file.
+	* ldmain.c (main): Init config.split_by_reloc and
+	config.split_by_file to -1.
+	* ld.h (ld_config_type): Change split_by_reloc to unsigned.
+	Change split_by_file to bfd_size_type.
+
 2000-09-02  Nick Clifton  <nickc@redhat.com>
 
 	* configure.in: Increase version number to 2.10.91.

ld/emultempl/elf32.em

@@ -1012,23 +1012,28 @@ gld${EMULATION_NAME}_place_orphan (file, s)
   lang_statement_list_type *old = NULL;
   lang_statement_list_type add;
   etree_type *address;
-  const char *secname, *ps = NULL;
+  const char *secname;
   const char *outsecname;
+  const char *ps = NULL;
   lang_output_section_statement_type *os;
 
   secname = bfd_get_section_name (s->owner, s);
 
+  if (! config.unique_orphan_sections)
+    {
       /* Look through the script to see where to place this section.  */ 
       os = lang_output_section_find (secname);
 
       if (os != NULL
 	  && os->bfd_section != NULL
-      && ((s->flags ^ os->bfd_section->flags) & (SEC_LOAD | SEC_ALLOC)) == 0)
+	  && ((s->flags ^ os->bfd_section->flags)
+	      & (SEC_LOAD | SEC_ALLOC)) == 0)
 	{
 	  /* We have already placed a section with this name.  */
 	  wild_doit (&os->children, s, os, file);
 	  return true;
 	}
+    }
 
   if (hold_text.os == NULL)
     hold_text.os = lang_output_section_find (".text");
@@ -1087,24 +1092,7 @@ gld${EMULATION_NAME}_place_orphan (file, s)
      loadable or allocateable characteristics.  */
   outsecname = secname;
   if (bfd_get_section_by_name (output_bfd, outsecname) != NULL)
-    {
+    outsecname = bfd_get_unique_section_name (output_bfd, outsecname, NULL);
-      unsigned int len;
-      char *newname;
-      unsigned int i;
-
-      len = strlen (outsecname);
-      newname = xmalloc (len + 5);
-      strcpy (newname, outsecname);
-      i = 0;
-      do
-	{
-	  sprintf (newname + len, "%d", i);
-	  ++i;
-	}
-      while (bfd_get_section_by_name (output_bfd, newname) != NULL);
-
-      outsecname = newname;
-    }
 
   if (place != NULL)
     {

ld/ld.h

@@ -206,8 +206,12 @@ typedef struct
 
   boolean stats;
 
-  int split_by_reloc;
+  /* If set, orphan input sections will be mapped to separate output
-  boolean split_by_file;
+     sections.  */
+  boolean unique_orphan_sections;
+
+  unsigned int split_by_reloc;
+  bfd_size_type split_by_file;
 } ld_config_type;
 
 extern ld_config_type config;

ld/ld.texinfo

@@ -692,6 +692,14 @@ with @samp{-Ur}; once the constructor table has been built, it cannot
 be added to.  Use @samp{-Ur} only for the last partial link, and
 @samp{-r} for the others.
 
+@kindex --unique
+@item --unique
+Creates a separate output section for every orphan input section.  This
+option prevents the normal merging of orphan input sections with the same
+name.  An orphan section is one not specifically mentioned in a linker
+script, so this option along with a custom linker script allows any
+selection of input sections to be merged while others are kept separate.
+
 @kindex -v
 @kindex -V
 @kindex --version
@@ -1135,22 +1143,23 @@ everything else.  This is to prevent gaps between symbols due to
 alignment constraints.
 
 @kindex --split-by-file
-@item --split-by-file
+@item --split-by-file [@var{size}]
 Similar to @code{--split-by-reloc} but creates a new output section for
-each input file.
+each input file when @var{size} is reached.  @var{size} defaults to a
+size of 1 if not given.
 
 @kindex --split-by-reloc
-@item --split-by-reloc @var{count}
+@item --split-by-reloc [@var{count}]
-Trys to creates extra sections in the output file so that no single
+Tries to creates extra sections in the output file so that no single
 output section in the file contains more than @var{count} relocations.
-This is useful when generating huge relocatable for downloading into
+This is useful when generating huge relocatable files for downloading into
 certain real time kernels with the COFF object file format; since COFF
 cannot represent more than 65535 relocations in a single section.  Note
 that this will fail to work with object file formats which do not
 support arbitrary sections.  The linker will not split up individual
 input sections for redistribution, so if a single input section contains
 more than @var{count} relocations one output section will contain that
-many relocations.
+many relocations.  @var{count} defaults to a value of 32768.
 
 @kindex --stats
 @item --stats

ld/ldmain.c

@@ -200,6 +200,8 @@ main (argc, argv)
   config.build_constructors = true;
   config.dynamic_link = false;
   config.has_shared = false;
+  config.split_by_reloc = (unsigned) -1;
+  config.split_by_file = (bfd_size_type) -1;
   command_line.force_common_definition = false;
   command_line.interpreter = NULL;
   command_line.rpath = NULL;

ld/ldwrite.c

@@ -1,5 +1,5 @@
 /* ldwrite.c -- write out the linked file
-   Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 1998
+   Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 2000
    Free Software Foundation, Inc.
    Written by Steve Chamberlain sac@cygnus.com
 
@@ -33,7 +33,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #include "ldmain.h"
 
 static void build_link_order PARAMS ((lang_statement_union_type *));
-static asection *clone_section PARAMS ((bfd *, asection *, int *));
+static asection *clone_section PARAMS ((bfd *, asection *, const char *, int *));
 static void split_sections PARAMS ((bfd *, struct bfd_link_info *));
 
 /* Build link_order structures for the BFD linker.  */
@@ -297,33 +297,29 @@ build_link_order (statement)
 /* Wander around the input sections, make sure that
    we'll never try and create an output section with more relocs
    than will fit.. Do this by always assuming the worst case, and
-   creating new output sections with all the right bits */
+   creating new output sections with all the right bits.  */
 #define TESTIT 1
 static asection *
-clone_section (abfd, s, count)
+clone_section (abfd, s, name, count)
      bfd *abfd;
      asection *s;
+     const char *name;
      int *count;
 {
-  char sname[8];		/* ??  find the name for this size */
+  char template[6];
+  char *sname;
   asection *n;
   struct bfd_link_hash_entry *h;
-  /* Invent a section name - use first five
-     chars of base section name and a digit suffix */
-  do
-    {
-      unsigned int i;
-      char b[6];
-      for (i = 0; i < sizeof (b) - 1 && s->name[i]; i++)
-	b[i] = s->name[i];
-      b[i] = 0;
-      sprintf (sname, "%s%d", b, (*count)++);
-    }
-  while (bfd_get_section_by_name (abfd, sname));
 
-  n = bfd_make_section_anyway (abfd, xstrdup (sname));
+  /* Invent a section name from the first five chars of the base
+     section name and a digit suffix.  */
+  strncpy (template, name, sizeof (template) - 1);
+  template[sizeof (template) - 1] = '\0';
+  sname = bfd_get_unique_section_name (abfd, template, count);
 
-  /* Create a symbol of the same name */
+  n = bfd_make_section_anyway (abfd, sname);
+
+  /* Create a symbol of the same name.  */
 
   h = bfd_link_hash_lookup (link_info.hash,
 			    sname, true, true, false);
@@ -331,7 +327,6 @@ clone_section (abfd, s, count)
   h->u.def.value = 0;
   h->u.def.section = n;
 
-
   n->flags = s->flags;
   n->vma = s->vma;
   n->user_set_vma = s->user_set_vma;
@@ -409,27 +404,27 @@ split_sections (abfd, info)
   asection *original_sec;
   int nsecs = abfd->section_count;
   sanity_check (abfd);
-  /* look through all the original sections */
+  /* Look through all the original sections.  */
   for (original_sec = abfd->sections;
        original_sec && nsecs;
        original_sec = original_sec->next, nsecs--)
     {
-      boolean first = true;
       int count = 0;
-      int lines = 0;
+      unsigned int lines = 0;
-      int relocs = 0;
+      unsigned int relocs = 0;
-      struct bfd_link_order **pp;
+      bfd_size_type sec_size = 0;
+      struct bfd_link_order *l;
+      struct bfd_link_order *p;
       bfd_vma vma = original_sec->vma;
-      bfd_vma shift_offset = 0;
       asection *cursor = original_sec;
 
-      /* count up the relocations and line entries to see if
+      /* Count up the relocations and line entries to see if anything
-	 anything would be too big to fit */
+	 would be too big to fit.  Accumulate section size too.  */
-      for (pp = &(cursor->link_order_head); *pp; pp = &((*pp)->next))
+      for (l = NULL, p = cursor->link_order_head; p != NULL; p = l->next)
 	{
-	  struct bfd_link_order *p = *pp;
+	  unsigned int thislines = 0;
-	  int thislines = 0;
+	  unsigned int thisrelocs = 0;
-	  int thisrelocs = 0;
+	  bfd_size_type thissize = 0;
 	  if (p->type == bfd_indirect_link_order)
 	    {
 	      asection *sec;
@@ -443,63 +438,81 @@ split_sections (abfd, info)
 	      if (info->relocateable)
 		thisrelocs = sec->reloc_count;
 
+	      if (sec->_cooked_size != 0)
+		thissize = sec->_cooked_size;
+	      else
+		thissize = sec->_raw_size;
+
 	    }
 	  else if (info->relocateable
 		   && (p->type == bfd_section_reloc_link_order
 		       || p->type == bfd_symbol_reloc_link_order))
 	    thisrelocs++;
 
-	  if (! first
+	  if (l != NULL
-	      && (thisrelocs + relocs > config.split_by_reloc
+	      && (thisrelocs + relocs >= config.split_by_reloc
-		  || thislines + lines > config.split_by_reloc
+		  || thislines + lines >= config.split_by_reloc
-		  || config.split_by_file))
+		  || thissize + sec_size >= config.split_by_file))
 	    {
-	      /* create a new section and put this link order and the
+	      /* Create a new section and put this link order and the
-		 following link orders into it */
+		 following link orders into it.  */
-	      struct bfd_link_order *l = p;
+	      bfd_vma shift_offset;
-	      asection *n = clone_section (abfd, cursor, &count);
+	      asection *n;
-	      *pp = NULL;	/* Snip off link orders from old section */
-	      n->link_order_head = l;	/* attach to new section */
-	      pp = &n->link_order_head;
 
-	      /* change the size of the original section and
+	      n = clone_section (abfd, cursor, original_sec->name, &count);
-		 update the vma of the new one */
+
+	      /* Attach the link orders to the new section and snip
+		 them off from the old section.  */
+	      n->link_order_head = p;
+	      n->link_order_tail = cursor->link_order_tail;
+	      cursor->link_order_tail = l;
+	      l->next = NULL;
+	      l = p;
+
+	      /* Change the size of the original section and
+		 update the vma of the new one.  */
 
 	      dump ("before snip", cursor, n);
 
-	      n->_raw_size = cursor->_raw_size - l->offset;
+	      shift_offset = p->offset;
-	      cursor->_raw_size = l->offset;
+	      if (cursor->_cooked_size != 0)
+		{
+		  n->_cooked_size = cursor->_cooked_size - shift_offset;
+		  cursor->_cooked_size = shift_offset;
+		}
+	      n->_raw_size = cursor->_raw_size - shift_offset;
+	      cursor->_raw_size = shift_offset;
 
-	      vma += cursor->_raw_size;
+	      vma += shift_offset;
 	      n->lma = n->vma = vma;
 
-	      shift_offset = l->offset;
+	      /* Run down the chain and change the output section to
-
+		 the right one, update the offsets too.  */
-	      /* run down the chain and change the output section to
+	      do
-		 the right one, update the offsets too */
-
-	      while (l)
 		{
-		  l->offset -= shift_offset;
+		  p->offset -= shift_offset;
-		  if (l->type == bfd_indirect_link_order)
+		  if (p->type == bfd_indirect_link_order)
 		    {
-		      l->u.indirect.section->output_section = n;
+		      p->u.indirect.section->output_section = n;
-		      l->u.indirect.section->output_offset = l->offset;
+		      p->u.indirect.section->output_offset = p->offset;
 		    }
-		  l = l->next;
+		  p = p->next;
 		}
+	      while (p);
+
 	      dump ("after snip", cursor, n);
 	      cursor = n;
 	      relocs = thisrelocs;
 	      lines = thislines;
+	      sec_size = thissize;
 	    }
 	  else
 	    {
+	      l = p;
 	      relocs += thisrelocs;
 	      lines += thislines;
+	      sec_size += thissize;
 	    }
-
-	  first = false;
 	}
     }
   sanity_check (abfd);
@@ -509,11 +522,12 @@ void
 ldwrite ()
 {
   /* Reset error indicator, which can typically something like invalid
-     format from openning up the .o files */
+     format from opening up the .o files.  */
   bfd_set_error (bfd_error_no_error);
   lang_for_each_statement (build_link_order);
 
-  if (config.split_by_reloc || config.split_by_file)
+  if (config.split_by_reloc != (unsigned) -1
+      || config.split_by_file != (bfd_size_type) -1)
     split_sections (output_bfd, &link_info);
   if (!bfd_final_link (output_bfd, &link_info))
     {

ld/lexsup.c

@@ -125,6 +125,7 @@ int parsing_defsym = 0;
 #define OPTION_INIT                     (OPTION_NO_UNDEFINED + 1)
 #define OPTION_FINI                     (OPTION_INIT + 1)
 #define OPTION_SECTION_START		(OPTION_FINI + 1)
+#define OPTION_UNIQUE			(OPTION_SECTION_START + 1)
 
 /* The long options.  This structure is used for both the option
    parsing and the help text.  */
@@ -224,6 +225,8 @@ static const struct ld_option ld_options[] =
       'T', N_("FILE"), N_("Read linker script"), TWO_DASHES },
   { {"undefined", required_argument, NULL, 'u'},
       'u', N_("SYMBOL"), N_("Start with undefined reference to SYMBOL"), TWO_DASHES },
+  { {"unique", no_argument, NULL, OPTION_UNIQUE},
+      '\0', NULL, N_("Don't merge orphan sections with the same name"), TWO_DASHES },
   { {"Ur", no_argument, NULL, OPTION_UR},
       '\0', NULL, N_("Build global constructor/destructor tables"), ONE_DASH },
   { {"version", no_argument, NULL, OPTION_VERSION},
@@ -326,10 +329,10 @@ static const struct ld_option ld_options[] =
       '\0', NULL, N_("Sort common symbols by size"), TWO_DASHES },
   { {"sort_common", no_argument, NULL, OPTION_SORT_COMMON},
       '\0', NULL, NULL, NO_HELP },
-  { {"split-by-file", no_argument, NULL, OPTION_SPLIT_BY_FILE},
+  { {"split-by-file", optional_argument, NULL, OPTION_SPLIT_BY_FILE},
-      '\0', NULL, N_("Split output sections for each file"), TWO_DASHES },
+      '\0', N_("[=SIZE]"), N_("Split output sections every SIZE octets"), TWO_DASHES },
-  { {"split-by-reloc", required_argument, NULL, OPTION_SPLIT_BY_RELOC},
+  { {"split-by-reloc", optional_argument, NULL, OPTION_SPLIT_BY_RELOC},
-      '\0', N_("COUNT"), N_("Split output sections every COUNT relocs"), TWO_DASHES },
+      '\0', N_("[=COUNT]"), N_("Split output sections every COUNT relocs"), TWO_DASHES },
   { {"stats", no_argument, NULL, OPTION_STATS},
       '\0', NULL, N_("Print memory usage statistics"), TWO_DASHES },
   { {"task-link", required_argument, NULL, OPTION_TASK_LINK},
@@ -917,6 +920,9 @@ parse_args (argc, argv)
 	case 'u':
 	  ldlang_add_undef (optarg);
 	  break;
+	case OPTION_UNIQUE:
+	  config.unique_orphan_sections = true;
+	  break;
 	case OPTION_VERBOSE:
 	  ldversion (1);
 	  version_printed = true;
@@ -1005,10 +1011,16 @@ the GNU General Public License.  This program has absolutely no warranty.\n"));
 	  add_ysym (optarg);
 	  break;
 	case OPTION_SPLIT_BY_RELOC:
+	  if (optarg != NULL)
 	    config.split_by_reloc = strtoul (optarg, NULL, 0);
+	  else
+	    config.split_by_reloc = 32768;
 	  break; 
 	case OPTION_SPLIT_BY_FILE:
-	  config.split_by_file = true;
+	  if (optarg != NULL)
+	    config.split_by_file = bfd_scan_vma (optarg, NULL, 0);
+	  else
+	    config.split_by_file = 1;
 	  break; 
 	case OPTION_CHECK_SECTIONS:
 	  command_line.check_section_addresses = true;