[compiler-rt] r332046 - [sanitizer] Port fast stack unwinder to sparcv8
Walter Lee via llvm-commits
llvm-commits at lists.llvm.org
Thu May 10 14:40:16 PDT 2018
Author: waltl
Date: Thu May 10 14:40:16 2018
New Revision: 332046
URL: http://llvm.org/viewvc/llvm-project?rev=332046&view=rev
Log:
[sanitizer] Port fast stack unwinder to sparcv8
Differential Revision: https://reviews.llvm.org/D46469
Added:
compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace_sparc.cc
Modified:
compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt
compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc
Modified: compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt?rev=332046&r1=332045&r2=332046&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt (original)
+++ compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt Thu May 10 14:40:16 2018
@@ -72,6 +72,7 @@ set(SANITIZER_SYMBOLIZER_SOURCES
sanitizer_stacktrace.cc
sanitizer_stacktrace_libcdep.cc
sanitizer_stacktrace_printer.cc
+ sanitizer_stacktrace_sparc.cc
sanitizer_symbolizer.cc
sanitizer_symbolizer_fuchsia.cc
sanitizer_symbolizer_libbacktrace.cc
Modified: compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc?rev=332046&r1=332045&r2=332046&view=diff
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc (original)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace.cc Thu May 10 14:40:16 2018
@@ -20,7 +20,7 @@ namespace __sanitizer {
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;
@@ -40,6 +40,9 @@ void BufferedStackTrace::Init(const uptr
top_frame_bp = 0;
}
+// Sparc implemention is in its own file.
+#if !defined(__sparc__)
+
// In GCC on ARM bp points to saved lr, not fp, so we should check the next
// cell in stack to be a saved frame pointer. GetCanonicFrame returns the
// pointer to saved frame pointer in any case.
@@ -106,6 +109,8 @@ void BufferedStackTrace::FastUnwindStack
}
}
+#endif // !defined(__sparc__)
+
void BufferedStackTrace::PopStackFrames(uptr count) {
CHECK_LT(count, size);
size -= count;
Added: compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace_sparc.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace_sparc.cc?rev=332046&view=auto
==============================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace_sparc.cc (added)
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_stacktrace_sparc.cc Thu May 10 14:40:16 2018
@@ -0,0 +1,58 @@
+//===-- sanitizer_stacktrace_sparc.cc -------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries.
+//
+// Implemention of fast stack unwinding for Sparc.
+//===----------------------------------------------------------------------===//
+
+// This file is ported to Sparc v8, but it should be easy to port to
+// Sparc v9.
+#if defined(__sparcv8__)
+
+#include "sanitizer_common.h"
+#include "sanitizer_stacktrace.h"
+
+namespace __sanitizer {
+
+void BufferedStackTrace::FastUnwindStack(uptr pc, uptr bp, uptr stack_top,
+ uptr stack_bottom, u32 max_depth) {
+ const uptr kPageSize = GetPageSizeCached();
+ CHECK_GE(max_depth, 2);
+ trace_buffer[0] = pc;
+ size = 1;
+ if (stack_top < 4096) return; // Sanity check for stack top.
+ // Flush register windows to memory
+ asm volatile("ta 3" ::: "memory");
+ uhwptr *frame = (uhwptr*)bp;
+ // Lowest possible address that makes sense as the next frame pointer.
+ // Goes up as we walk the stack.
+ uptr bottom = stack_bottom;
+ // Avoid infinite loop when frame == frame[0] by using frame > prev_frame.
+ while (IsValidFrame((uptr)frame, stack_top, bottom) &&
+ IsAligned((uptr)frame, sizeof(*frame)) &&
+ size < max_depth) {
+ uhwptr pc1 = frame[15];
+ // Let's assume that any pointer in the 0th page is invalid and
+ // stop unwinding here. If we're adding support for a platform
+ // where this isn't true, we need to reconsider this check.
+ if (pc1 < kPageSize)
+ break;
+ if (pc1 != pc) {
+ trace_buffer[size++] = (uptr) pc1;
+ }
+ bottom = (uptr)frame;
+ frame = (uhwptr*)frame[14];
+ }
+}
+
+} // namespace __sanitizer
+
+#endif // !defined(__sparcv8__)
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