* ldgram.y: Add SPECIAL token.

(sect_constraint): Handle SPECIAL. * ldlang.c (lang_output_section_find_1): Don't match SPECIAL. (map_input_to_output_sections): Likewise. * ldlex.l (SPECIAL): Define. * emulparams/elf32ppc.sh (DATA_GOT, SDATA_GOT, SEPARATE_GOTPLT, GOT, PLT, GOTPLT): Define. * emultempl/ppc32elf.em (old_plt, old_got): New static vars. (ppc_after_open): New function. (PARSE_AND_LIST_PROLOGUE): Define OPTION_OLD_LPT and OPTION_OLD_GOT. (PARSE_AND_LIST_LONGOPTS): Add "bss-plt" and "sdata-got". (PARSE_AND_LIST_OPTIONS): Document them. (PARSE_AND_LIST_ARGS_CASES): Handle them. (LDEMUL_AFTER_OPEN): Define. * scripttempl/elf.sc (PLT): Don't override existing define. (DATA_GOT, SDATA_GOT): Define and use to enable alternate got placement rather than using NO_SMALL_DATA. Emit GOTPLT for RELRO_NOW.
2005-05-11 14:10:10 +00:00 · 2005-05-11 14:10:10 +00:00 · 0cf7d72c50
commit 0cf7d72c50
parent d7128ce4b1
7 changed files with 135 additions and 13 deletions
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@ -1,3 +1,23 @@
+2005-05-11  Alan Modra  <amodra@bigpond.net.au>
+
+	* ldgram.y: Add SPECIAL token.
+	(sect_constraint): Handle SPECIAL.
+	* ldlang.c (lang_output_section_find_1): Don't match SPECIAL.
+	(map_input_to_output_sections): Likewise.
+	* ldlex.l (SPECIAL): Define.
+	* emulparams/elf32ppc.sh (DATA_GOT, SDATA_GOT, SEPARATE_GOTPLT,
+	GOT, PLT, GOTPLT): Define.
+	* emultempl/ppc32elf.em (old_plt, old_got): New static vars.
+	(ppc_after_open): New function.
+	(PARSE_AND_LIST_PROLOGUE): Define OPTION_OLD_LPT and OPTION_OLD_GOT.
+	(PARSE_AND_LIST_LONGOPTS): Add "bss-plt" and "sdata-got".
+	(PARSE_AND_LIST_OPTIONS): Document them.
+	(PARSE_AND_LIST_ARGS_CASES): Handle them.
+	(LDEMUL_AFTER_OPEN): Define.
+	* scripttempl/elf.sc (PLT): Don't override existing define.
+	(DATA_GOT, SDATA_GOT): Define and use to enable alternate got
+	placement rather than using NO_SMALL_DATA.  Emit GOTPLT for RELRO_NOW.
+
 2005-05-10  Alan Modra  <amodra@bigpond.net.au>

 	* scripttempl/elf.sc (DATA_SEGMENT_RELRO_GOTPLT_END): Delete.
@ -164,7 +184,7 @@
 2005-04-07  Nick Clifton  <nickc@redhat.com>

 	* emultempl/m68kcoff.em: Include ldexp.h and ldlang.h so that
-	ldfile.h can use the lang_input_statement type. 
+	ldfile.h can use the lang_input_statement type.

 2005-04-06  Jakub Jelinek  <jakub@redhat.com>

--- a/ld/emulparams/elf32ppc.sh
+++ b/ld/emulparams/elf32ppc.sh
@ -12,7 +12,16 @@ MAXPAGESIZE=0x10000
 COMMONPAGESIZE=0x1000
 ARCH=powerpc:common
 MACHINE=
+# Yes, we want duplicate .got and .plt sections.  The linker chooses the
+# appropriate one magically in ppc_after_open
+DATA_GOT=
+SDATA_GOT=
+SEPARATE_GOTPLT=0
 BSS_PLT=
+GOT=".got          ${RELOCATING-0} : SPECIAL { *(.got) }"
+PLT=".plt          ${RELOCATING-0} : SPECIAL { *(.plt) }"
+GOTPLT="${PLT}"
+OTHER_TEXT_SECTIONS="*(.glink)"
 EXECUTABLE_SYMBOLS='PROVIDE (__stack = 0); PROVIDE (___stack = 0);'
 OTHER_BSS_END_SYMBOLS='__end = .;'
 OTHER_RELRO_SECTIONS="
--- a/ld/emultempl/ppc32elf.em
+++ b/ld/emultempl/ppc32elf.em
@ -32,6 +32,66 @@ extern const bfd_target bfd_elf32_powerpcle_vec;
 /* Whether to run tls optimization.  */
 static int notlsopt = 0;

+/* Chooses the correct place for .plt and .got.  */
+static int old_plt = 0;
+static int old_got = 0;
+
+static void
+ppc_after_open (void)
+{
+  if (link_info.hash->creator == &bfd_elf32_powerpc_vec
+      || link_info.hash->creator == &bfd_elf32_powerpcle_vec)
+    {
+      int new_plt;
+      int keep_new;
+      unsigned int num_plt;
+      unsigned int num_got;
+      lang_output_section_statement_type *os;
+      lang_output_section_statement_type *plt_os[2];
+      lang_output_section_statement_type *got_os[2];
+
+      new_plt = ppc_elf_select_plt_layout (output_bfd, &link_info, old_plt);
+      if (new_plt < 0)
+	einfo ("%X%P: select_plt_layout problem %E\n");
+
+      num_got = 0;
+      num_plt = 0;
+      for (os = &lang_output_section_statement.head->output_section_statement;
+	   os != NULL;
+	   os = os->next)
+	{
+	  if (os->constraint == SPECIAL && strcmp (os->name, ".plt") == 0)
+	    {
+	      if (num_plt < 2)
+		plt_os[num_plt] = os;
+	      ++num_plt;
+	    }
+	  if (os->constraint == SPECIAL && strcmp (os->name, ".got") == 0)
+	    {
+	      if (num_got < 2)
+		got_os[num_got] = os;
+	      ++num_got;
+	    }
+	}
+
+      keep_new = new_plt == 1 ? 0 : -1;
+      if (num_plt == 2)
+	{
+	  plt_os[0]->constraint = keep_new;
+	  plt_os[1]->constraint = ~keep_new;
+	}
+      if (num_got == 2)
+	{
+	  if (old_got)
+	    keep_new = -1;
+	  got_os[0]->constraint = keep_new;
+	  got_os[1]->constraint = ~keep_new;
+	}
+    }
+
+  gld${EMULATION_NAME}_after_open ();
+}
+
 static void
 ppc_before_allocation (void)
 {
@ -68,15 +128,21 @@ EOF
 #
 PARSE_AND_LIST_PROLOGUE='
 #define OPTION_NO_TLS_OPT		301
+#define OPTION_OLD_PLT			302
+#define OPTION_OLD_GOT			303
 '

 PARSE_AND_LIST_LONGOPTS='
  { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
+  { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
+  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
 '

 PARSE_AND_LIST_OPTIONS='
  fprintf (file, _("\
-  --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n"
+  --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
+  --bss-plt             Force old-style BSS PLT.\n\
+  --sdata-got           Force GOT location just before .sdata.\n"
 		   ));
 '

@ -84,9 +150,18 @@ PARSE_AND_LIST_ARGS_CASES='
    case OPTION_NO_TLS_OPT:
      notlsopt = 1;
      break;
+
+    case OPTION_OLD_PLT:
+      old_plt = 1;
+      break;
+
+    case OPTION_OLD_GOT:
+      old_got = 1;
+      break;
 '

 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 #
+LDEMUL_AFTER_OPEN=ppc_after_open
 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
--- a/ld/ldgram.y
+++ b/ld/ldgram.y
@ -151,7 +151,7 @@ static int error_index;
 %token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM CASE EXTERN START
 %token <name> VERS_TAG VERS_IDENTIFIER
 %token GLOBAL LOCAL VERSIONK INPUT_VERSION_SCRIPT
-%token KEEP ONLY_IF_RO ONLY_IF_RW
+%token KEEP ONLY_IF_RO ONLY_IF_RW SPECIAL
 %token EXCLUDE_FILE
 %type <versyms> vers_defns
 %type <versnode> vers_tag
@ -899,6 +899,7 @@ opt_subalign:
 sect_constraint:
 		ONLY_IF_RO { $$ = ONLY_IF_RO; }
 	|	ONLY_IF_RW { $$ = ONLY_IF_RW; }
+	|	SPECIAL { $$ = SPECIAL; }
 	|	{ $$ = 0; }
 	;

--- a/ld/ldlang.c
+++ b/ld/ldlang.c
@ -991,7 +991,9 @@ lang_output_section_find_1 (const char *const name, int constraint)
    {
      if (strcmp (name, lookup->name) == 0
 	  && lookup->constraint != -1
-	  && (constraint == 0 || constraint == lookup->constraint))
+	  && (constraint == 0
+	      || (constraint == lookup->constraint
+		  && constraint != SPECIAL)))
 	return lookup;
    }
  return NULL;
@ -2951,7 +2953,8 @@ map_input_to_output_sections
 	case lang_output_section_statement_enum:
 	  if (s->output_section_statement.constraint)
 	    {
-	      if (s->output_section_statement.constraint == -1)
+	      if (s->output_section_statement.constraint != ONLY_IF_RW
+		  && s->output_section_statement.constraint != ONLY_IF_RO)
 		break;
 	      s->output_section_statement.all_input_readonly = TRUE;
 	      check_input_sections (s->output_section_statement.children.head,
--- a/ld/ldlex.l
+++ b/ld/ldlex.l
@ -303,6 +303,7 @@ V_IDENTIFIER [*?.$_a-zA-Z\[\]\-\!\^\\]([*?.$_a-zA-Z0-9\[\]\-\!\^\\]|::)*
 <EXPRESSION,BOTH,SCRIPT>"OVERLAY"	{ RTOKEN(OVERLAY);}
 <EXPRESSION,BOTH,SCRIPT>"ONLY_IF_RO"	{ RTOKEN(ONLY_IF_RO); }
 <EXPRESSION,BOTH,SCRIPT>"ONLY_IF_RW"	{ RTOKEN(ONLY_IF_RW); }
+<EXPRESSION,BOTH,SCRIPT>"SPECIAL"	{ RTOKEN(SPECIAL); }
 <BOTH,SCRIPT>"o"			{ RTOKEN(ORIGIN);}
 <BOTH,SCRIPT>"org"			{ RTOKEN(ORIGIN);}
 <BOTH,SCRIPT>"l"			{ RTOKEN( LENGTH);}
--- a/ld/scripttempl/elf.sc
+++ b/ld/scripttempl/elf.sc
@ -101,7 +101,9 @@ if test -n "${COMMONPAGESIZE}"; then
  DATA_SEGMENT_RELRO_END=". = DATA_SEGMENT_RELRO_END (${SEPARATE_GOTPLT-0}, .);"
 fi
 INTERP=".interp       ${RELOCATING-0} : { *(.interp) }"
-PLT=".plt          ${RELOCATING-0} : { *(.plt) }"
+if test -z "$PLT"; then
+  PLT=".plt          ${RELOCATING-0} : { *(.plt) }"
+fi
 if test -z "$GOT"; then
  if test -z "$SEPARATE_GOTPLT"; then
    GOT=".got          ${RELOCATING-0} : { *(.got.plt) *(.got) }"
@ -144,6 +146,16 @@ if test -z "${NO_SMALL_DATA}"; then
 else
  NO_SMALL_DATA=" "
 fi
+if test -z "${DATA_GOT}"; then
+  if test -n "${NO_SMALL_DATA}"; then
+    DATA_GOT=" "
+  fi
+fi
+if test -z "${SDATA_GOT}"; then
+  if test -z "${NO_SMALL_DATA}"; then
+    SDATA_GOT=" "
+  fi
+fi
 test -n "$SEPARATE_GOTPLT" && SEPARATE_GOTPLT=" "
 CTOR=".ctors        ${CONSTRUCTING-0} : 
  {
@ -343,11 +355,12 @@ cat <<EOF
  ${RELOCATING+${DATARELRO}}
  ${OTHER_RELRO_SECTIONS}
  ${TEXT_DYNAMIC-${DYNAMIC}}
-  ${NO_SMALL_DATA+${RELRO_NOW+${GOT}}}
-  ${NO_SMALL_DATA+${RELRO_NOW-${SEPARATE_GOTPLT+${GOT}}}}
+  ${DATA_GOT+${RELRO_NOW+${GOT}}}
+  ${DATA_GOT+${RELRO_NOW+${GOTPLT}}}
+  ${DATA_GOT+${RELRO_NOW-${SEPARATE_GOTPLT+${GOT}}}}
  ${RELOCATING+${DATA_SEGMENT_RELRO_END}}
-  ${NO_SMALL_DATA+${RELRO_NOW-${SEPARATE_GOTPLT+${GOTPLT}}}}
-  ${NO_SMALL_DATA+${RELRO_NOW-${SEPARATE_GOTPLT-${GOT}}}}
+  ${DATA_GOT+${RELRO_NOW-${SEPARATE_GOTPLT-${GOT}}}}
+  ${DATA_GOT+${RELRO_NOW-${GOTPLT}}}

  ${DATA_PLT+${PLT_BEFORE_GOT-${PLT}}}

@ -364,9 +377,9 @@ cat <<EOF
  ${SMALL_DATA_CTOR+${RELOCATING+${CTOR}}}
  ${SMALL_DATA_DTOR+${RELOCATING+${DTOR}}}
  ${DATA_PLT+${PLT_BEFORE_GOT+${PLT}}}
-  ${RELOCATING+${OTHER_GOT_SYMBOLS}}
-  ${NO_SMALL_DATA-${GOT}}
-  ${OTHER_GOT_SECTIONS}
+  ${SDATA_GOT+${RELOCATING+${OTHER_GOT_SYMBOLS}}}
+  ${SDATA_GOT+${GOT}}
+  ${SDATA_GOT+${OTHER_GOT_SECTIONS}}
  ${SDATA}
  ${OTHER_SDATA_SECTIONS}
  ${RELOCATING+${DATA_END_SYMBOLS-_edata = .; PROVIDE (edata = .);}}