[PATCH] D46469: [sanitizer] Port fast stack unwinder to sparcv8

[Walter Lee via Phabricator via llvm-commits]

waltl created this revision.
waltl added reviewers: vitalybuka, eugenis, alekseyshl.
Herald added subscribers: chrib, fedor.sergeev, kubamracek, jyknight.

Repository:
  rL LLVM

https://reviews.llvm.org/D46469

Files:
  compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc


Index: compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -20,7 +20,7 @@
 uptr StackTrace::GetNextInstructionPc(uptr pc) {
 #if defined(__mips__)
   return pc + 8;
-#elif defined(__powerpc__)
+#elif defined(__powerpc__) || defined(__sparc__)
   return pc + 4;
 #else
   return pc + 1;
@@ -71,6 +71,10 @@
   trace_buffer[0] = pc;
   size = 1;
   if (stack_top < 4096) return;  // Sanity check for stack top.
+#if defined(__sparcv8__)
+  // Flush register windows to memory
+  asm volatile("ta 3" ::: "memory");
+#endif
   uhwptr *frame = GetCanonicFrame(bp, stack_top, stack_bottom);
   // Lowest possible address that makes sense as the next frame pointer.
   // Goes up as we walk the stack.
@@ -90,6 +94,8 @@
     uhwptr pc1 = caller_frame[2];
 #elif defined(__s390__)
     uhwptr pc1 = frame[14];
+#elif defined(__sparcv8__)
+    uhwptr pc1 = frame[15];
 #else
     uhwptr pc1 = frame[1];
 #endif
@@ -102,7 +108,11 @@
       trace_buffer[size++] = (uptr) pc1;
     }
     bottom = (uptr)frame;
+#if defined(__sparcv8__)
+    frame = GetCanonicFrame((uptr)frame[14], stack_top, bottom);
+#else
     frame = GetCanonicFrame((uptr)frame[0], stack_top, bottom);
+#endif
   }
 }
 


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