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authorCary Coutant <ccoutant@google.com>2010-12-09 23:19:50 +0000
committerCary Coutant <ccoutant@google.com>2010-12-09 23:19:50 +0000
commit83e17bd5ed3c2586f558202172bf9f52ac80650c (patch)
tree3e1249454b28872800852006958bd7e5e27c2705 /gold
parentf9bbfb18bec91f344bcc74343ad77c8a0e49ed4e (diff)
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* layout.cc (Layout::layout_gnu_stack): Add warnings for executable
stack. * layout.h (Layout::layout_gnu_stack): Add pointer to Object parameter; change all callers. * object.cc (Sized_relobj::do_layout): Adjust call to layout_gnu_stack. * options.h (warn_execstack): New option.
Diffstat (limited to 'gold')
-rw-r--r--gold/ChangeLog9
-rw-r--r--gold/layout.cc20
-rw-r--r--gold/layout.h3
-rw-r--r--gold/object.cc2
-rw-r--r--gold/options.h4
5 files changed, 33 insertions, 5 deletions
diff --git a/gold/ChangeLog b/gold/ChangeLog
index 7a5c36c..5febda7 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,12 @@
+2010-12-09 Cary Coutant <ccoutant@google.com>
+
+ * layout.cc (Layout::layout_gnu_stack): Add warnings for executable
+ stack.
+ * layout.h (Layout::layout_gnu_stack): Add pointer to Object
+ parameter; change all callers.
+ * object.cc (Sized_relobj::do_layout): Adjust call to layout_gnu_stack.
+ * options.h (warn_execstack): New option.
+
2010-12-07 Doug Kwan <dougkwan@google.com>
* arm.cc (Target_arm::Scan::get_reference_flags): Treat R_ARM_PREL31
diff --git a/gold/layout.cc b/gold/layout.cc
index 52120cc..9bf9a9f 100644
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -1344,15 +1344,29 @@ Layout::expected_segment_count() const
// object. On some targets that will force an executable stack.
void
-Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags)
+Layout::layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags,
+ const Object* obj)
{
if (!seen_gnu_stack)
- this->input_without_gnu_stack_note_ = true;
+ {
+ this->input_without_gnu_stack_note_ = true;
+ if (parameters->options().warn_execstack()
+ && parameters->target().is_default_stack_executable())
+ gold_warning(_("%s: missing .note.GNU-stack section"
+ " implies executable stack"),
+ obj->name().c_str());
+ }
else
{
this->input_with_gnu_stack_note_ = true;
if ((gnu_stack_flags & elfcpp::SHF_EXECINSTR) != 0)
- this->input_requires_executable_stack_ = true;
+ {
+ this->input_requires_executable_stack_ = true;
+ if (parameters->options().warn_execstack()
+ || parameters->options().is_stack_executable())
+ gold_warning(_("%s: requires executable stack"),
+ obj->name().c_str());
+ }
}
}
diff --git a/gold/layout.h b/gold/layout.h
index 6e817ca..cfbb9f0 100644
--- a/gold/layout.h
+++ b/gold/layout.h
@@ -470,7 +470,8 @@ class Layout
// .note.GNU-stack section. GNU_STACK_FLAGS is the section flags
// from that section if there was one.
void
- layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags);
+ layout_gnu_stack(bool seen_gnu_stack, uint64_t gnu_stack_flags,
+ const Object*);
// Add an Output_section_data to the layout. This is used for
// special sections like the GOT section. ORDER is where the
diff --git a/gold/object.cc b/gold/object.cc
index bde89f6..466d26f 100644
--- a/gold/object.cc
+++ b/gold/object.cc
@@ -1429,7 +1429,7 @@ Sized_relobj<size, big_endian>::do_layout(Symbol_table* symtab,
}
if (!is_gc_pass_two)
- layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
+ layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags, this);
// When doing a relocatable link handle the reloc sections at the
// end. Garbage collection and Identical Code Folding is not
diff --git a/gold/options.h b/gold/options.h
index 7a694a9..8f240f0 100644
--- a/gold/options.h
+++ b/gold/options.h
@@ -1035,6 +1035,10 @@ class General_options
DEFINE_bool(warn_constructors, options::TWO_DASHES, '\0', false,
N_("Ignored"), N_("Ignored"));
+ DEFINE_bool(warn_execstack, options::TWO_DASHES, '\0', false,
+ N_("Warn if the stack is executable"),
+ N_("Do not warn if the stack is executable (default)"));
+
DEFINE_bool(warn_mismatch, options::TWO_DASHES, '\0', true,
NULL, N_("Don't warn about mismatched input files"));