bfd/

	* elf32-ppc.h (ppc_elf_select_plt_layout): Update prototype.
	(enum ppc_elf_plt_type): Move from..
	* elf32-ppc.c: ..here.
	(struct ppc_elf_obj_tdata): Add makes_plt_call and has_rel16.
	(struct ppc_elf_link_hash_table): Reorder.  Add old_bfd.  Delete
	can_use_new_plt.  Make is_vxworks a bitfield.
	(ppc_elf_link_hash_table_create): Don't clear is_vxworks (again).
	(ppc_elf_check_relocs): Update setting of reloc flags.  Set old_bfd.
	(ppc_elf_select_plt_layout): Modify parameters.  Use bfd reloc
	flags to better detect object files needing old bss-style plt.
	Allow secure plt to be used without rel16 relocs being detected.
	Warn if secure plt request cannot be allowed.
ld/
	* emultempl/ppc32elf.em (plt_style): New variable.
	(old_plt): Delete.
	(ppc_after_open): Adjust ppc_elf_select_plt_layout call.
	(PARSE_AND_LIST_PROLOGUE): Define OPTION_NEW_PLT, renumber
	OPTION_OLD_PLT, OPTION_OLD_GOT and OPTION_STUBSYMS.
	(PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS): Add secure-plt.
	(PARSE_AND_LIST_ARGS_CASES): Handle OPTION_NEW_PLT.
	* ld.texinfo (--secure-plt): Document.

3 files changed, 33 insertions, 7 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 3a7e751..6951481 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,14 @@
+2007-05-11  Alan Modra  <amodra@bigpond.net.au>
+
+	* emultempl/ppc32elf.em (plt_style): New variable.
+	(old_plt): Delete.
+	(ppc_after_open): Adjust ppc_elf_select_plt_layout call.
+	(PARSE_AND_LIST_PROLOGUE): Define OPTION_NEW_PLT, renumber
+	OPTION_OLD_PLT, OPTION_OLD_GOT and OPTION_STUBSYMS.
+	(PARSE_AND_LIST_LONGOPTS, PARSE_AND_LIST_OPTIONS): Add secure-plt.
+	(PARSE_AND_LIST_ARGS_CASES): Handle OPTION_NEW_PLT.
+	* ld.texinfo (--secure-plt): Document.
+
 2007-05-08  Alan Modra  <amodra@bigpond.net.au>
 
 	* ld.h (args_type, ld_config_type): Reorder fields.
diff --git a/ld/emultempl/ppc32elf.em b/ld/emultempl/ppc32elf.em
index cee14c0..b0239e0 100644
--- a/ld/emultempl/ppc32elf.em
+++ b/ld/emultempl/ppc32elf.em
@@ -1,5 +1,5 @@
 # This shell script emits a C file. -*- C -*-
-#   Copyright 2003, 2005 Free Software Foundation, Inc.
+#   Copyright 2003, 2005, 2007 Free Software Foundation, Inc.
 #
 # This file is part of GLD, the Gnu Linker.
 #
@@ -45,7 +45,7 @@ static int notlsopt = 0;
 static int emit_stub_syms = 0;
 
 /* Chooses the correct place for .plt and .got.  */
-static int old_plt = 0;
+static enum ppc_elf_plt_type plt_style = PLT_UNSET;
 static int old_got = 0;
 
 static void
@@ -62,7 +62,7 @@ ppc_after_open (void)
       lang_output_section_statement_type *got_os[2];
 
       emit_stub_syms |= link_info.emitrelocations;
-      new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, old_plt,
+      new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, plt_style,
 					   emit_stub_syms);
       if (new_plt < 0)
 	einfo ("%X%P: select_plt_layout problem %E\n");
@@ -148,14 +148,16 @@ fi
 #
 PARSE_AND_LIST_PROLOGUE='
 #define OPTION_NO_TLS_OPT		301
-#define OPTION_OLD_PLT			302
-#define OPTION_OLD_GOT			303
-#define OPTION_STUBSYMS			304
+#define OPTION_NEW_PLT			302
+#define OPTION_OLD_PLT			303
+#define OPTION_OLD_GOT			304
+#define OPTION_STUBSYMS			305
 '
 
 PARSE_AND_LIST_LONGOPTS='
   { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
+  { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
   { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
 '
@@ -164,6 +166,7 @@ PARSE_AND_LIST_OPTIONS='
   fprintf (file, _("\
   --emit-stub-syms      Label linker stubs with a symbol.\n\
   --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
+  --secure-plt          Use new-style PLT if possible.\n\
   --bss-plt             Force old-style BSS PLT.\n\
   --sdata-got           Force GOT location just before .sdata.\n"
 		   ));
@@ -178,8 +181,12 @@ PARSE_AND_LIST_ARGS_CASES='
       notlsopt = 1;
       break;
 
+    case OPTION_NEW_PLT:
+      plt_style = PLT_NEW;
+      break;
+
     case OPTION_OLD_PLT:
-      old_plt = 1;
+      plt_style = PLT_OLD;
       break;
 
     case OPTION_OLD_GOT:
diff --git a/ld/ld.texinfo b/ld/ld.texinfo
index 788c515..700662e 100644
--- a/ld/ld.texinfo
+++ b/ld/ld.texinfo
@@ -5699,6 +5699,14 @@ PLT, if all input files (including startup and static libraries) were
 compiled with @samp{-msecure-plt}.  @samp{--bss-plt} forces the old
 BSS PLT (and GOT layout) which can give slightly better performance.
 
+@kindex --secure-plt
+@item --secure-plt
+@command{ld} will use the new PLT and GOT layout if it is linking new
+@samp{-fpic} or @samp{-fPIC} code, but does not do so automatically
+when linking non-PIC code.  This option requests the new PLT and GOT
+layout.  A warning will be given if some object file requires the old
+style BSS PLT.
+
 @cindex PowerPC GOT
 @kindex --sdata-got
 @item --sdata-got