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Fix handling of __ehdr_start when it cannot be defined.

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2014-05-02  Cary Coutant  <ccoutant@google.com>

	* defstd.cc (in_segment): Define __ehdr_start here...
	* layout.cc (Layout::finalize): ...Instead of here.  Set the
	output segment when known.
	* resolve.cc (Symbol::override_base_with_special): Remember
	the original binding.
	* symtab.cc (Symbol::set_output_segment): New function.
	(Symbol::set_undefined): New function.
	* symtab.h (Symbol::is_weak_undefined): Check original undef
	binding.
	(Symbol::is_strong_undefined): New function.
	(Symbol::set_output_segment): New function.
	(Symbol::set_undefined): New function.
	* target-reloc.h (is_strong_undefined): Remove.
	(issue_undefined_symbol_error): Call Symbol::is_weak_undefined.
	Check for hidden undefs.
	(relocate_section): Call Symbol::is_strong_undefined.

	* testsuite/Makefile.am (ehdr_start_test_1)
	(ehdr_start_test_2, ehdr_start_test_3)
	(ehdr_start_test_4, ehdr_start_test_5): New test cases.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/ehdr_start_def.cc: New source file.
	* testsuite/ehdr_start_test.cc: New source file.
	* testsuite/ehdr_start_test.t: New linker script.
	* testsuite/ehdr_start_test_4.sh: New shell script.
This commit is contained in:
Cary Coutant
2014-04-02 14:21:14 -07:00
parent 30a1e6cc77
commit d1bddd3c4b
13 changed files with 533 additions and 44 deletions
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14
gold/layout.cc
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@@ -2749,12 +2749,14 @@ Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab,
// If there is a load segment that contains the file and program headers,
// provide a symbol __ehdr_start pointing there.
// A program can use this to examine itself robustly.
if (load_seg != NULL)
symtab->define_in_output_segment("__ehdr_start", NULL,
Symbol_table::PREDEFINED, load_seg, 0, 0,
elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
elfcpp::STV_HIDDEN, 0,
Symbol::SEGMENT_START, true);
Symbol *ehdr_start = symtab->lookup("__ehdr_start");
if (ehdr_start != NULL && ehdr_start->is_predefined())
{
if (load_seg != NULL)
ehdr_start->set_output_segment(load_seg, Symbol::SEGMENT_START);
else
ehdr_start->set_undefined();
}
// Set the file offsets of all the non-data sections we've seen so
// far which don't have to wait for the input sections. We need