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//===-- 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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