X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=ld%2Femultempl%2Fppc32elf.em;h=56148132df83285f9f3af4923f8dde9d2d488c66;hb=74e315dbfe5200c473b226e937935fb8ce391489;hp=cb27161f7171a52bfbe53f2d7f09f33d12cc7315;hpb=75be928bd2cbcc431c59bb3b9f20a7c002fc2022;p=binutils-gdb.git

diff --git a/ld/emultempl/ppc32elf.em b/ld/emultempl/ppc32elf.em
index cb27161f717..56148132df8 100644
--- a/ld/emultempl/ppc32elf.em
+++ b/ld/emultempl/ppc32elf.em
@@ -1,11 +1,11 @@
 # This shell script emits a C file. -*- C -*-
-#   Copyright 2003, 2005 Free Software Foundation, Inc.
+#   Copyright (C) 2003-2022 Free Software Foundation, Inc.
 #
-# This file is part of GLD, the Gnu Linker.
+# 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 2 of the License, or
+# 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,
@@ -15,32 +15,55 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
+# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+# MA 02110-1301, USA.
 #
 
-# This file is sourced from elf32.em, and defines extra powerpc32-elf
+# This file is sourced from elf.em, and defines extra powerpc32-elf
 # specific routines.
 #
-cat >>e${EMULATION_NAME}.c <<EOF
+fragment <<EOF
 
-#include "libbfd.h"
 #include "elf32-ppc.h"
+#include "ldlex.h"
+#include "ldlang.h"
 
-extern const bfd_target bfd_elf32_powerpc_vec;
-extern const bfd_target bfd_elf32_powerpcle_vec;
+#define is_ppc_elf(bfd) \
+  (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
+   && elf_object_id (bfd) == PPC32_ELF_DATA)
 
 /* Whether to run tls optimization.  */
 static int notlsopt = 0;
 
-/* Chooses the correct place for .plt and .got.  */
-static int old_plt = 0;
+/* Whether to convert inline PLT calls to direct.  */
+static int no_inline_opt = 0;
+
+/* Choose the correct place for .got.  */
 static int old_got = 0;
 
+static struct ppc_elf_params params = { PLT_UNSET, 0, -1,
+					0, 0, 0, 0, 0, 0, 0 };
+
+static void
+ppc_after_open_output (void)
+{
+  if (params.emit_stub_syms < 0)
+    params.emit_stub_syms = (link_info.emitrelocations
+			     || bfd_link_pic (&link_info));
+  if (params.pagesize == 0)
+    params.pagesize = link_info.commonpagesize;
+  ppc_elf_link_params (&link_info, &params);
+}
+
+EOF
+
+# No --secure-plt, --bss-plt, or --sdata-got for vxworks.
+if test -z "$VXWORKS_BASE_EM_FILE" ; then
+  fragment <<EOF
 static void
-ppc_after_open (void)
+ppc_after_check_relocs (void)
 {
-  if (link_info.hash->creator == &bfd_elf32_powerpc_vec
-      || link_info.hash->creator == &bfd_elf32_powerpcle_vec)
+  if (is_ppc_elf (link_info.output_bfd))
     {
       int new_plt;
       int keep_new;
@@ -50,13 +73,13 @@ ppc_after_open (void)
       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);
+      new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
       if (new_plt < 0)
-	einfo ("%X%P: select_plt_layout problem %E\n");
+	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;
+      for (os = (void *) lang_os_list.head;
 	   os != NULL;
 	   os = os->next)
 	{
@@ -89,79 +112,335 @@ ppc_after_open (void)
 	}
     }
 
-  gld${EMULATION_NAME}_after_open ();
+  after_check_relocs_default ();
+}
+
+EOF
+fi
+fragment <<EOF
+static void
+prelim_size_sections (void)
+{
+  if (expld.phase != lang_mark_phase_enum)
+    {
+      expld.phase = lang_mark_phase_enum;
+      expld.dataseg.phase = exp_seg_none;
+      one_lang_size_sections_pass (NULL, false);
+      /* We must not cache anything from the preliminary sizing.  */
+      lang_reset_memory_regions ();
+    }
 }
 
 static void
 ppc_before_allocation (void)
 {
-  if (link_info.hash->creator == &bfd_elf32_powerpc_vec
-      || link_info.hash->creator == &bfd_elf32_powerpcle_vec)
+  if (is_ppc_elf (link_info.output_bfd))
     {
-      if (ppc_elf_tls_setup (output_bfd, &link_info) && !notlsopt)
+      if (!no_inline_opt
+	  && !bfd_link_relocatable (&link_info))
+	{
+	  prelim_size_sections ();
+
+	  if (!ppc_elf_inline_plt (&link_info))
+	    einfo (_("%X%P: inline PLT: %E\n"));
+	}
+
+      if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
+	  && !notlsopt)
 	{
-	  if (!ppc_elf_tls_optimize (output_bfd, &link_info))
+	  if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
 	    {
-	      einfo ("%X%P: TLS problem %E\n");
+	      einfo (_("%X%P: TLS problem %E\n"));
 	      return;
 	    }
 	}
     }
+
   gld${EMULATION_NAME}_before_allocation ();
+
+  ppc_elf_maybe_strip_sdata_syms (&link_info);
+
+  if (RELAXATION_ENABLED)
+    params.branch_trampolines = 1;
+
+  /* Turn on relaxation if executable sections have addresses that
+     might make branches overflow.  */
+  else if (!RELAXATION_DISABLED_BY_USER)
+    {
+      bfd_vma low = (bfd_vma) -1;
+      bfd_vma high = 0;
+      asection *o;
+
+      /* Run lang_size_sections even if already done, so as to pick
+	 up gld${EMULATION_NAME}_before_allocation sizing.  This
+	 matters when we have an executable bss plt which will
+	 typically be laid out near the end of the image, ie. worst
+	 case for branches at the start of .text.  */
+      expld.phase = lang_first_phase_enum;
+      prelim_size_sections ();
+
+      for (o = link_info.output_bfd->sections; o != NULL; o = o->next)
+	{
+	  if ((o->flags & (SEC_ALLOC | SEC_CODE)) != (SEC_ALLOC | SEC_CODE))
+	    continue;
+	  if (o->rawsize == 0)
+	    continue;
+	  if (low > o->vma)
+	    low = o->vma;
+	  if (high < o->vma + o->rawsize - 1)
+	    high = o->vma + o->rawsize - 1;
+	}
+      if (high > low && high - low > (1 << 25) - 1)
+	params.branch_trampolines = 1;
+    }
+
+  if (params.branch_trampolines
+      || params.ppc476_workaround
+      || params.pic_fixup > 0)
+    ENABLE_RELAXATION;
 }
 
+/* Replaces default zero fill padding in executable sections with
+   "ba 0" instructions.  This works around the ppc476 icache bug if we
+   have a function pointer tail call near the end of a page, some
+   small amount of padding, then the function called at the beginning
+   of the next page.  If the "ba 0" is ever executed we should hit a
+   segv, so it's almost as good as an illegal instruction (zero).  */
+
 static void
-gld${EMULATION_NAME}_after_allocation (void)
+no_zero_padding (lang_statement_union_type *l)
 {
-  if (link_info.hash->creator == &bfd_elf32_powerpc_vec
-      || link_info.hash->creator == &bfd_elf32_powerpcle_vec)
+  if (l->header.type == lang_padding_statement_enum
+      && l->padding_statement.size != 0
+      && l->padding_statement.output_section != NULL
+      && (l->padding_statement.output_section->flags & SEC_CODE) != 0
+      && l->padding_statement.fill->size == 0)
     {
-      if (!ppc_elf_set_sdata_syms (output_bfd, &link_info))
-	einfo ("%X%P: cannot set sdata syms %E\n");
+      struct _ppc_fill_type
+      {
+	size_t size;
+	unsigned char data[4];
+      };
+      static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} };
+      static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} };
+
+      if (bfd_big_endian (link_info.output_bfd))
+	l->padding_statement.fill = (struct _fill_type *) &fill_be;
+      else
+	l->padding_statement.fill = (struct _fill_type *) &fill_le;
     }
 }
 
+static void
+ppc_finish (void)
+{
+  if (params.ppc476_workaround)
+    lang_for_each_statement (no_zero_padding);
+  if (!ppc_finish_symbols (&link_info))
+    einfo (_("%X%P: ppc_finish_symbols problem %E\n"));
+  finish_default ();
+}
+
 EOF
 
+if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
+  fragment <<EOF
+/* Special handling for embedded SPU executables.  */
+extern bool embedded_spu_file (lang_input_statement_type *, const char *);
+
+static bool
+ppc_recognized_file (lang_input_statement_type *entry)
+{
+  if (embedded_spu_file (entry, "-m32"))
+    return true;
+
+  return ldelf_load_symbols (entry);
+}
+
+EOF
+LDEMUL_RECOGNIZED_FILE=ppc_recognized_file
+fi
+
 # Define some shell vars to insert bits of code into the standard elf
 # parse_args and list_options functions.
 #
-PARSE_AND_LIST_PROLOGUE='
-#define OPTION_NO_TLS_OPT		301
-#define OPTION_OLD_PLT			302
-#define OPTION_OLD_GOT			303
+PARSE_AND_LIST_PROLOGUE=${PARSE_AND_LIST_PROLOGUE}'
+enum ppc32_opt
+{
+  OPTION_NO_TLS_OPT = 321,
+  OPTION_NO_TLS_GET_ADDR_OPT,
+  OPTION_NEW_PLT,
+  OPTION_OLD_PLT,
+  OPTION_PLT_ALIGN,
+  OPTION_NO_PLT_ALIGN,
+  OPTION_NO_INLINE_OPT,
+  OPTION_OLD_GOT,
+  OPTION_STUBSYMS,
+  OPTION_NO_STUBSYMS,
+  OPTION_PPC476_WORKAROUND,
+  OPTION_NO_PPC476_WORKAROUND,
+  OPTION_NO_PICFIXUP,
+  OPTION_VLE_RELOC_FIXUP
+};
 '
 
-PARSE_AND_LIST_LONGOPTS='
+PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
+  { "emit-stub-syms", no_argument, NULL, OPTION_STUBSYMS },
+  { "no-emit-stub-syms", no_argument, NULL, OPTION_NO_STUBSYMS },
   { "no-tls-optimize", no_argument, NULL, OPTION_NO_TLS_OPT },
+  { "no-tls-get-addr-optimize", no_argument, NULL, OPTION_NO_TLS_GET_ADDR_OPT },'
+if test -z "$VXWORKS_BASE_EM_FILE" ; then
+  PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
+  { "secure-plt", no_argument, NULL, OPTION_NEW_PLT },
   { "bss-plt", no_argument, NULL, OPTION_OLD_PLT },
-  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },
+  { "plt-align", optional_argument, NULL, OPTION_PLT_ALIGN },
+  { "no-plt-align", no_argument, NULL, OPTION_NO_PLT_ALIGN },
+  { "no-inline-optimize", no_argument, NULL, OPTION_NO_INLINE_OPT },
+  { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
+fi
+PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
+  { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
+  { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
+  { "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP },
+  { "vle-reloc-fixup", no_argument, NULL, OPTION_VLE_RELOC_FIXUP },
 '
 
-PARSE_AND_LIST_OPTIONS='
+PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
+  fprintf (file, _("\
+  --emit-stub-syms            Label linker stubs with a symbol\n"
+		   ));
+  fprintf (file, _("\
+  --no-emit-stub-syms         Don'\''t label linker stubs with a symbol\n"
+		   ));
   fprintf (file, _("\
-  --no-tls-optimize     Don'\''t try to optimize TLS accesses.\n\
-  --bss-plt             Force old-style BSS PLT.\n\
-  --sdata-got           Force GOT location just before .sdata.\n"
+  --no-tls-optimize           Don'\''t try to optimize TLS accesses\n"
+		   ));
+  fprintf (file, _("\
+  --no-tls-get-addr-optimize  Don'\''t use a special __tls_get_addr call\n"
+		   ));'
+if test -z "$VXWORKS_BASE_EM_FILE" ; then
+  PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
+  fprintf (file, _("\
+  --secure-plt                Use new-style PLT if possible\n"
+		   ));
+  fprintf (file, _("\
+  --bss-plt                   Force old-style BSS PLT\n"
+		   ));
+  fprintf (file, _("\
+  --plt-align                 Align PLT call stubs to fit cache lines\n"
+		   ));
+  fprintf (file, _("\
+  --no-plt-align              Dont'\''t align individual PLT call stubs\n"
+		   ));
+  fprintf (file, _("\
+  --no-inline-optimize        Don'\''t convert inline PLT to direct calls\n"
+		   ));
+  fprintf (file, _("\
+  --sdata-got                 Force GOT location just before .sdata\n"
+		   ));'
+fi
+PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
+  fprintf (file, _("\
+  --ppc476-workaround [=pagesize]\n\
+                              Avoid a cache bug on ppc476\n"
+		   ));
+  fprintf (file, _("\
+  --no-ppc476-workaround      Disable workaround\n"
+		   ));
+  fprintf (file, _("\
+  --no-pic-fixup              Don'\''t edit non-pic to pic\n"
+		   ));
+  fprintf (file, _("\
+  --vle-reloc-fixup           Correct old object file 16A/16D relocation\n"
 		   ));
 '
 
-PARSE_AND_LIST_ARGS_CASES='
+PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
+    case OPTION_STUBSYMS:
+      params.emit_stub_syms = 1;
+      break;
+
+    case OPTION_NO_STUBSYMS:
+      params.emit_stub_syms = 0;
+      break;
+
     case OPTION_NO_TLS_OPT:
       notlsopt = 1;
       break;
 
+    case OPTION_NO_TLS_GET_ADDR_OPT:
+      params.no_tls_get_addr_opt = 1;
+      break;
+
+    case OPTION_NEW_PLT:
+      params.plt_style = PLT_NEW;
+      break;
+
     case OPTION_OLD_PLT:
-      old_plt = 1;
+      params.plt_style = PLT_OLD;
+      break;
+
+    case OPTION_PLT_ALIGN:
+      if (optarg != NULL)
+	{
+	  char *end;
+	  unsigned long val = strtoul (optarg, &end, 0);
+	  if (*end || val > 5)
+	    einfo (_("%F%P: invalid --plt-align `%s'\''\n"), optarg);
+	  params.plt_stub_align = val;
+	}
+      else
+	params.plt_stub_align = 5;
+      break;
+
+    case OPTION_NO_PLT_ALIGN:
+      params.plt_stub_align = 0;
+      break;
+
+    case OPTION_NO_INLINE_OPT:
+      no_inline_opt = 1;
       break;
 
     case OPTION_OLD_GOT:
       old_got = 1;
       break;
+
+    case OPTION_TRADITIONAL_FORMAT:
+      notlsopt = 1;
+      params.no_tls_get_addr_opt = 1;
+      return false;
+
+    case OPTION_PPC476_WORKAROUND:
+      params.ppc476_workaround = 1;
+      if (optarg != NULL)
+	{
+	  char *end;
+	  params.pagesize = strtoul (optarg, &end, 0);
+	  if (*end
+	      || (params.pagesize < 4096 && params.pagesize != 0)
+	      || params.pagesize != (params.pagesize & -params.pagesize))
+	    einfo (_("%F%P: invalid pagesize `%s'\''\n"), optarg);
+	}
+      break;
+
+    case OPTION_NO_PPC476_WORKAROUND:
+      params.ppc476_workaround = 0;
+      break;
+
+    case OPTION_NO_PICFIXUP:
+      params.pic_fixup = -1;
+      break;
+
+    case OPTION_VLE_RELOC_FIXUP:
+      params.vle_reloc_fixup = 1;
+      break;
 '
 
 # Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
 #
-LDEMUL_AFTER_OPEN=ppc_after_open
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
+if test -z "$VXWORKS_BASE_EM_FILE" ; then
+  LDEMUL_AFTER_CHECK_RELOCS=ppc_after_check_relocs
+fi
 LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
-LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_FINISH=ppc_finish