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[sanitizer_common] Fix UnwindFast on SPARC #101634

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Aug 3, 2024
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[sanitizer_common] Fix UnwindFast on SPARC #101634

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11 changes: 5 additions & 6 deletions compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_sparc.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -58,17 +58,16 @@ void BufferedStackTrace::UnwindFast(uptr pc, uptr bp, uptr stack_top,
// Avoid infinite loop when frame == frame[0] by using frame > prev_frame.
while (IsValidFrame(bp, stack_top, bottom) && IsAligned(bp, sizeof(uhwptr)) &&
size < max_depth) {
uhwptr pc1 = ((uhwptr *)bp)[15];
// %o7 contains the address of the call instruction and not the
// return address, so we need to compensate.
uhwptr pc1 = GetNextInstructionPc(((uhwptr *)bp)[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) {
// %o7 contains the address of the call instruction and not the
// return address, so we need to compensate.
trace_buffer[size++] = GetNextInstructionPc((uptr)pc1);
}
if (pc1 != pc)
trace_buffer[size++] = pc1;
bottom = bp;
bp = (uptr)((uhwptr *)bp)[14] + STACK_BIAS;
}
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