[PATCH] D19543: [MSan] [PowerPC] Dereference function descriptors when recording stack origins.

[Marcin Kościelnicki via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL267795: [MSan] [PowerPC] Dereference function descriptors when recording stack origins. (authored by koriakin).

Changed prior to commit:
  http://reviews.llvm.org/D19543?vs=55310&id=55320#toc

Repository:
  rL LLVM

http://reviews.llvm.org/D19543

Files:
  compiler-rt/trunk/lib/msan/msan.cc

Index: compiler-rt/trunk/lib/msan/msan.cc
===================================================================
--- compiler-rt/trunk/lib/msan/msan.cc
+++ compiler-rt/trunk/lib/msan/msan.cc
@@ -538,6 +538,13 @@
     u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
     CHECK_LT(idx, kNumStackOriginDescrs);
     StackOriginDescr[idx] = descr + 4;
+#if SANITIZER_PPC64V1
+    // On PowerPC64 ELFv1, the address of a function actually points to a
+    // three-doubleword data structure with the first field containing
+    // the address of the function's code.
+    if (pc)
+      pc = *reinterpret_cast<uptr*>(pc);
+#endif
     StackOriginPC[idx] = pc;
     id = Origin::CreateStackOrigin(idx).raw_id();
     *id_ptr = id;


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