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[PATCH] gold: provide __ehdr_start magic symbol
- From: Roland McGrath <mcgrathr at google dot com>
- To: binutils at sourceware dot org
- Date: Fri, 22 Jun 2012 09:58:35 -0700
- Subject: [PATCH] gold: provide __ehdr_start magic symbol
This makes gold define __ehdr_start, consistent with the change that just
went into BFD ld.
Ok for trunk?
Thanks,
Roland
gold/
2012-06-22 Roland McGrath <mcgrathr@google.com>
* layout.cc (finalize): Define __ehdr_start symbol if applicable.
diff --git a/gold/layout.cc b/gold/layout.cc
index 154be88..ad667ab 100644
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -2509,6 +2509,16 @@ Layout::finalize(const Input_objects* input_objects, Symbol_table* symtab,
while (target->may_relax()
&& target->relax(pass, input_objects, symtab, this, task));
+ // 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_DEFAULT, 0,
+ Symbol::SEGMENT_START, true);
+
// 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
// this in order to finalize local symbols in non-allocated