# This shell script emits a C file. -*- C -*-
-# Copyright 2003, 2005, 2007, 2008, 2009, 2010, 2011, 2012
-# Free Software Foundation, Inc.
+# Copyright (C) 2003-2016 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
#include "libbfd.h"
#include "elf32-ppc.h"
#include "ldlex.h"
+#include "ldlang.h"
#define is_ppc_elf(bfd) \
(bfd_get_flavour (bfd) == bfd_target_elf_flavour \
/* Whether to run tls optimization. */
static int notlsopt = 0;
-static int no_tls_get_addr_opt = 0;
-/* Whether to emit symbols for stubs. */
-static int emit_stub_syms = -1;
-
-/* Chooses the correct place for .plt and .got. */
-static enum ppc_elf_plt_type plt_style = PLT_UNSET;
+/* Choose the correct place for .got. */
static int old_got = 0;
+static bfd_vma pagesize = 0;
+
+static struct ppc_elf_params params = { PLT_UNSET, -1, 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 (pagesize == 0)
+ pagesize = config.commonpagesize;
+ params.pagesize_p2 = bfd_log2 (pagesize);
+ ppc_elf_link_params (&link_info, ¶ms);
+}
+
+EOF
+
+# No --secure-plt, --bss-plt, or --sdata-got for vxworks.
+if test -z "$VXWORKS_BASE_EM_FILE" ; then
+ fragment <<EOF
static void
ppc_after_open (void)
{
lang_output_section_statement_type *plt_os[2];
lang_output_section_statement_type *got_os[2];
- if (emit_stub_syms < 0)
- emit_stub_syms = link_info.emitrelocations || link_info.shared;
- new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info,
- plt_style, emit_stub_syms);
+ new_plt = ppc_elf_select_plt_layout (link_info.output_bfd, &link_info);
if (new_plt < 0)
einfo ("%X%P: select_plt_layout problem %E\n");
gld${EMULATION_NAME}_after_open ();
}
+EOF
+fi
+fragment <<EOF
static void
ppc_before_allocation (void)
{
if (is_ppc_elf (link_info.output_bfd))
{
- if (ppc_elf_tls_setup (link_info.output_bfd, &link_info,
- no_tls_get_addr_opt)
+ if (ppc_elf_tls_setup (link_info.output_bfd, &link_info)
&& !notlsopt)
{
if (!ppc_elf_tls_optimize (link_info.output_bfd, &link_info))
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. */
- if (RELAXATION_DISABLED_BY_DEFAULT)
+ else if (!RELAXATION_DISABLED_BY_USER)
{
bfd_vma low = (bfd_vma) -1;
bfd_vma high = 0;
high = o->vma + o->rawsize - 1;
}
if (high > low && high - low > (1 << 25) - 1)
- ENABLE_RELAXATION;
+ 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
+no_zero_padding (lang_statement_union_type *l)
+{
+ 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)
+ {
+ 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);
+ finish_default ();
}
EOF
#define OPTION_OLD_GOT (OPTION_OLD_PLT + 1)
#define OPTION_STUBSYMS (OPTION_OLD_GOT + 1)
#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
+#define OPTION_PPC476_WORKAROUND (OPTION_NO_STUBSYMS + 1)
+#define OPTION_NO_PPC476_WORKAROUND (OPTION_PPC476_WORKAROUND + 1)
+#define OPTION_NO_PICFIXUP (OPTION_NO_PPC476_WORKAROUND + 1)
'
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 },
+ { "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 },
+ { "sdata-got", no_argument, NULL, OPTION_OLD_GOT },'
+fi
+PARSE_AND_LIST_LONGOPTS=${PARSE_AND_LIST_LONGOPTS}'
+ { "ppc476-workaround", optional_argument, NULL, OPTION_PPC476_WORKAROUND },
+ { "no-ppc476-workaround", no_argument, NULL, OPTION_NO_PPC476_WORKAROUND },
+ { "no-pic-fixup", no_argument, NULL, OPTION_NO_PICFIXUP },
'
PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'
--emit-stub-syms Label linker stubs with a symbol.\n\
--no-emit-stub-syms Don'\''t label linker stubs with a symbol.\n\
--no-tls-optimize Don'\''t try to optimize TLS accesses.\n\
- --no-tls-get-addr-optimize Don'\''t use a special __tls_get_addr call.\n\
+ --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}'\
--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"
+ --sdata-got Force GOT location just before .sdata.\n'
+fi
+PARSE_AND_LIST_OPTIONS=${PARSE_AND_LIST_OPTIONS}'\
+ --ppc476-workaround [=pagesize]\n\
+ Avoid a cache bug on ppc476.\n\
+ --no-ppc476-workaround Disable workaround.\n\
+ --no-pic-fixup Don'\''t edit non-pic to pic.\n"
));
'
PARSE_AND_LIST_ARGS_CASES=${PARSE_AND_LIST_ARGS_CASES}'
case OPTION_STUBSYMS:
- emit_stub_syms = 1;
+ params.emit_stub_syms = 1;
break;
case OPTION_NO_STUBSYMS:
- emit_stub_syms = 0;
+ params.emit_stub_syms = 0;
break;
case OPTION_NO_TLS_OPT:
break;
case OPTION_NO_TLS_GET_ADDR_OPT:
- no_tls_get_addr_opt = 1;
+ params.no_tls_get_addr_opt = 1;
break;
case OPTION_NEW_PLT:
- plt_style = PLT_NEW;
+ params.plt_style = PLT_NEW;
break;
case OPTION_OLD_PLT:
- plt_style = PLT_OLD;
+ params.plt_style = PLT_OLD;
break;
case OPTION_OLD_GOT:
case OPTION_TRADITIONAL_FORMAT:
notlsopt = 1;
- no_tls_get_addr_opt = 1;
+ params.no_tls_get_addr_opt = 1;
return FALSE;
+
+ case OPTION_PPC476_WORKAROUND:
+ params.ppc476_workaround = 1;
+ if (optarg != NULL)
+ {
+ char *end;
+ pagesize = strtoul (optarg, &end, 0);
+ if (*end
+ || (pagesize < 4096 && pagesize != 0)
+ || pagesize != (pagesize & -pagesize))
+ einfo (_("%P%F: 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;
'
# 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_OPEN=ppc_after_open
+fi
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
+LDEMUL_FINISH=ppc_finish
projects / deliverable / binutils-gdb.git / blobdiff