mirror of git://gcc.gnu.org/git/gcc.git
58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
//===-- sanitizer_stacktrace_sparc.cc -------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries.
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//
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// Implemention of fast stack unwinding for Sparc.
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//===----------------------------------------------------------------------===//
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// This file is ported to Sparc v8, but it should be easy to port to
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// Sparc v9.
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#if defined(__sparcv8__) || defined(__sparcv8) || defined(__sparc_v8__)
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#include "sanitizer_common.h"
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#include "sanitizer_stacktrace.h"
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namespace __sanitizer {
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void BufferedStackTrace::FastUnwindStack(uptr pc, uptr bp, uptr stack_top,
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uptr stack_bottom, u32 max_depth) {
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const uptr kPageSize = GetPageSizeCached();
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CHECK_GE(max_depth, 2);
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trace_buffer[0] = pc;
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size = 1;
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if (stack_top < 4096) return; // Sanity check for stack top.
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// Flush register windows to memory
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asm volatile("ta 3" ::: "memory");
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uhwptr *frame = (uhwptr*)bp;
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// Lowest possible address that makes sense as the next frame pointer.
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// Goes up as we walk the stack.
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uptr bottom = stack_bottom;
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// Avoid infinite loop when frame == frame[0] by using frame > prev_frame.
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while (IsValidFrame((uptr)frame, stack_top, bottom) &&
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IsAligned((uptr)frame, sizeof(*frame)) &&
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size < max_depth) {
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uhwptr pc1 = frame[15];
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// Let's assume that any pointer in the 0th page is invalid and
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// stop unwinding here. If we're adding support for a platform
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// where this isn't true, we need to reconsider this check.
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if (pc1 < kPageSize)
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break;
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if (pc1 != pc) {
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trace_buffer[size++] = (uptr) pc1;
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}
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bottom = (uptr)frame;
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frame = (uhwptr*)frame[14];
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}
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}
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} // namespace __sanitizer
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#endif // !defined(__sparcv8__) && !defined(__sparcv8) &&
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// !defined(__sparc_v8__)
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