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[GOLD] Add --secure-plt option for ppc32

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Added just to accept, and ignore.  gcc since 2015-10-21, when
configured with --enable-secureplt passes this option to the linker.
As powerpc gold cannot link --bss-plt code successfully, gold needs to
accept the option or the gcc specs file needs to be changed.

The patch also make gold detect --bss-plt code and error out rather
than producing a binary that crashes.

	* options.h: Add --secure-plt option.
	* powerpc.cc (Target_powerpc::Scan::local): Detect and error
	on -fPIC -mbss-plt code.
	(Target_powerpc::Scan::global): Likewise.
This commit is contained in:
Alan Modra 2017-01-10 10:24:09 +10:30
parent eaa38cfd42
commit f159cdb611
3 changed files with 48 additions and 0 deletions
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7
gold/ChangeLog
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@ -1,3 +1,10 @@
2017-01-10 Alan Modra <amodra@gmail.com>
* options.h: Add --secure-plt option.
* powerpc.cc (Target_powerpc::Scan::local): Detect and error
on -fPIC -mbss-plt code.
(Target_powerpc::Scan::global): Likewise.
2017-01-09 Alan Modra <amodra@gmail.com>
* powerpc.cc (Target_powerpc::make_plt_section): Point sh_info of

3
gold/options.h
View file

@ -1203,6 +1203,9 @@ class General_options
DEFINE_special(section_start, options::TWO_DASHES, '\0',
N_("Set address of section"), N_("SECTION=ADDRESS"));
DEFINE_bool(secure_plt, options::TWO_DASHES , '\0', true,
N_("(PowerPC only) Use new-style PLT"), NULL);
DEFINE_optional_string(sort_common, options::TWO_DASHES, '\0', NULL,
N_("Sort common symbols by alignment"),
N_("[={ascending,descending}]"));

38
gold/powerpc.cc
View file

@ -5972,6 +5972,30 @@ Target_powerpc<size, big_endian>::Scan::local(
break;
}
if (size == 32)
{
switch (r_type)
{
case elfcpp::R_POWERPC_REL32:
if (ppc_object->got2_shndx() != 0
&& parameters->options().output_is_position_independent())
{
unsigned int shndx = lsym.get_st_shndx();
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
bool is_ordinary;
shndx = ppc_object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
if (is_ordinary && shndx == ppc_object->got2_shndx()
&& (ppc_object->section_flags(data_shndx)
& elfcpp::SHF_EXECINSTR) != 0)
gold_error(_("%s: unsupported -mbss-plt code"),
ppc_object->name().c_str());
}
break;
default:
break;
}
}
switch (r_type)
{
case elfcpp::R_POWERPC_GOT_TLSLD16:
@ -6473,6 +6497,20 @@ Target_powerpc<size, big_endian>::Scan::global(
break;
}
if (size == 32)
{
switch (r_type)
{
case elfcpp::R_PPC_LOCAL24PC:
if (strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0)
gold_error(_("%s: unsupported -mbss-plt code"),
ppc_object->name().c_str());
break;
default:
break;
}
}
switch (r_type)
{
case elfcpp::R_POWERPC_GOT_TLSLD16: