# 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 \
static bfd_vma pagesize = 0;
-static struct ppc_elf_params params = { PLT_UNSET, -1, 0, 0, 0, 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 || link_info.shared;
+ 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 "$VXWORKS_BASE_EM_FILE" ; then
+ fragment <<EOF
static void
ppc_after_open (void)
{
gld${EMULATION_NAME}_after_open ();
}
+EOF
+fi
+fragment <<EOF
static void
ppc_before_allocation (void)
{
gld${EMULATION_NAME}_before_allocation ();
+ ppc_elf_maybe_strip_sdata_syms (&link_info);
+
if (RELAXATION_ENABLED)
params.branch_trampolines = 1;
params.branch_trampolines = 1;
}
- if (params.ppc476_workaround || params.branch_trampolines)
+ if (params.branch_trampolines
+ || params.ppc476_workaround
+ || params.pic_fixup > 0)
ENABLE_RELAXATION;
}
+/* Replaces default zero fill padding in executable sections with
+ "ba 0" instructions. This works around the ppc476 icache bug if we
+ have a function pointer tail call near the end of a page, some
+ small amount of padding, then the function called at the beginning
+ of the next page. If the "ba 0" is ever executed we should hit a
+ segv, so it's almost as good as an illegal instruction (zero). */
+
+static void
+no_zero_padding (lang_statement_union_type *l)
+{
+ if (l->header.type == lang_padding_statement_enum
+ && l->padding_statement.size != 0
+ && l->padding_statement.output_section != NULL
+ && (l->padding_statement.output_section->flags & SEC_CODE) != 0
+ && l->padding_statement.fill->size == 0)
+ {
+ struct _ppc_fill_type
+ {
+ size_t size;
+ unsigned char data[4];
+ };
+ static struct _ppc_fill_type fill_be = { 4, {0x48, 0, 0, 2} };
+ static struct _ppc_fill_type fill_le = { 4, {2, 0, 0, 0x48} };
+
+ if (bfd_big_endian (link_info.output_bfd))
+ l->padding_statement.fill = (struct _fill_type *) &fill_be;
+ else
+ l->padding_statement.fill = (struct _fill_type *) &fill_le;
+ }
+}
+
+static void
+ppc_finish (void)
+{
+ if (params.ppc476_workaround)
+ lang_for_each_statement (no_zero_padding);
+ finish_default ();
+}
+
EOF
if grep -q 'ld_elf32_spu_emulation' ldemul-list.h; then
#define OPTION_NO_STUBSYMS (OPTION_STUBSYMS + 1)
#define OPTION_PPC476_WORKAROUND (OPTION_NO_STUBSYMS + 1)
#define OPTION_NO_PPC476_WORKAROUND (OPTION_PPC476_WORKAROUND + 1)
+#define OPTION_NO_PICFIXUP (OPTION_NO_PPC476_WORKAROUND + 1)
'
PARSE_AND_LIST_LONGOPTS=${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=${PARSE_AND_LIST_OPTIONS}'\
--ppc476-workaround [=pagesize]\n\
Avoid a cache bug on ppc476.\n\
- --no-ppc476-workaround Disable workaround.\n"
+ --no-ppc476-workaround Disable workaround.\n\
+ --no-pic-fixup Don'\''t edit non-pic to pic.\n"
));
'
case OPTION_NO_PPC476_WORKAROUND:
params.ppc476_workaround = 0;
break;
+
+ case OPTION_NO_PICFIXUP:
+ params.pic_fixup = -1;
+ break;
'
# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=ppc_after_open_output
-LDEMUL_AFTER_OPEN=ppc_after_open
+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