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Revert "[PowerPC] Fix sanitizer frame unwind on 32-bit ABIs" 

This broke GreenDragon:
http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA_check/29210/

llvm-svn: 298029
This commit is contained in:
Juergen Ributzka 2017-03-17 01:15:39 +00:00
parent c4e4dcdf64
commit eecb0ec2ea
1 changed files with 7 additions and 14 deletions
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21
compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
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@ -79,22 +79,15 @@ void BufferedStackTrace::FastUnwindStack(uptr pc, uptr bp, uptr stack_top,
while (IsValidFrame((uptr)frame, stack_top, bottom) &&
IsAligned((uptr)frame, sizeof(*frame)) &&
size < max_depth) {
// PowerPC ABIs specify that the return address is saved on the
// *caller's* stack frame. Thus we must dereference the back chain
// to find the caller frame before extracting it.
uhwptr *caller_frame = (uhwptr*)frame[0];
if (!IsValidFrame((uptr)caller_frame, stack_top, bottom) ||
!IsAligned((uptr)caller_frame, sizeof(uhwptr)))
break;
#ifdef __powerpc__
// For most ABIs the offset where the return address is saved is two
// register sizes. The exception is the SVR4 ABI, which uses an
// offset of only one register size.
#ifdef _CALL_SYSV
uhwptr pc1 = caller_frame[1];
#else
// PowerPC ABIs specify that the return address is saved at offset
// 16 of the *caller's* stack frame. Thus we must dereference the
// back chain to find the caller frame before extracting it.
uhwptr *caller_frame = (uhwptr*)frame[0];
if (!IsValidFrame((uptr)caller_frame, stack_top, bottom) ||
!IsAligned((uptr)caller_frame, sizeof(uhwptr)))
break;
uhwptr pc1 = caller_frame[2];
#endif
#elif defined(__s390__)
uhwptr pc1 = frame[14];
#else