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authorAlan Modra <amodra@gmail.com>2017-09-20 09:17:56 +0930
committerAlan Modra <amodra@gmail.com>2017-09-20 09:56:19 +0930
commit64b5d6d785eb4c337b7c071ab9607186541a8b14 (patch)
treec6dd995b5b91dde8a284551d384e637526c68ea3 /gold
parentdba74cb2b725ee8857dee865fb7f49c86aad1aed (diff)
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[GOLD] PowerPC function address in non-PIC
ppc32, like many targets, defines the address of a function as the PLT call stub code for functions referenced but not defined in a non-PIC executable. ppc32 gold, unlike other targets, inherits the ppc64 multiple stub capability for dealing with very large binaries where one set of stubs can't be reached from all code locations. This means there can be multiple choices of address for a function, which might cause function pointer comparison failures. So for ppc32, make non-branch references always use the first stub group. (PowerPC64 ELFv1 is always PIC so doesn't need to define the address of an external function as the PLT stub. PowerPC64 ELFv2 needs a special set of global entry stubs to serve as the address of external functions, so it too is not affected by this bug.) * powerpc.cc (Target_powerpc::Branch_info::make_stub): Put stubs for ppc32 non-branch relocs in first stub table. (Target_powerpc::Relocate::relocate): Resolve similarly.
Diffstat (limited to 'gold')
-rw-r--r--gold/ChangeLog6
-rw-r--r--gold/powerpc.cc25
2 files changed, 26 insertions, 5 deletions
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 867cbef..4faf195 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,9 @@
+2017-09-20 Alan Modra <amodra@gmail.com>
+
+ * powerpc.cc (Target_powerpc::Branch_info::make_stub): Put
+ stubs for ppc32 non-branch relocs in first stub table.
+ (Target_powerpc::Relocate::relocate): Resolve similarly.
+
2017-09-19 Alan Modra <amodra@gmail.com>
* options.h (stub-group-multi): Default to true. Add
diff --git a/gold/powerpc.cc b/gold/powerpc.cc
index ff116e3..ba302f2 100644
--- a/gold/powerpc.cc
+++ b/gold/powerpc.cc
@@ -3151,11 +3151,17 @@ Target_powerpc<size, big_endian>::Branch_info::make_stub(
target->glink_section()->add_global_entry(gsym);
else
{
- if (stub_table == NULL)
+ if (stub_table == NULL
+ && !(size == 32
+ && gsym != NULL
+ && !parameters->options().output_is_position_independent()
+ && !is_branch_reloc(this->r_type_)))
stub_table = this->object_->stub_table(this->shndx_);
if (stub_table == NULL)
{
- // This is a ref from a data section to an ifunc symbol.
+ // This is a ref from a data section to an ifunc symbol,
+ // or a non-branch reloc for which we always want to use
+ // one set of stubs for resolving function addresses.
stub_table = ifunc_stub_table;
}
gold_assert(stub_table != NULL);
@@ -8334,11 +8340,20 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
}
else
{
- Stub_table<size, big_endian>* stub_table
- = object->stub_table(relinfo->data_shndx);
+ Stub_table<size, big_endian>* stub_table = NULL;
+ if (target->stub_tables().size() == 1)
+ stub_table = target->stub_tables()[0];
+ if (stub_table == NULL
+ && !(size == 32
+ && gsym != NULL
+ && !parameters->options().output_is_position_independent()
+ && !is_branch_reloc(r_type)))
+ stub_table = object->stub_table(relinfo->data_shndx);
if (stub_table == NULL)
{
- // This is a ref from a data section to an ifunc symbol.
+ // This is a ref from a data section to an ifunc symbol,
+ // or a non-branch reloc for which we always want to use
+ // one set of stubs for resolving function addresses.
if (target->stub_tables().size() != 0)
stub_table = target->stub_tables()[0];
}