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re PR sanitizer/63927 (AddressSanitizer painfully slow on ppc64)

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2015-07-28  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR sanitizer/63927
	* sanitizer_common/sanitizer_stacktrace.cc
	(BufferedStackTrace::FastUnwindStack): Fix code for PowerPC to
	find the link register at an offset of 16 from the base of the
	caller's stack frame.

From-SVN: r226335
This commit is contained in:
Bill Schmidt 2015-07-29 03:33:10 +00:00 • committed by William Schmidt
parent c73858e982
commit 3d61d87585
2 changed files with 19 additions and 0 deletions
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8
libsanitizer/ChangeLog
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@ -1,3 +1,11 @@
2015-07-28 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR sanitizer/63927
* sanitizer_common/sanitizer_stacktrace.cc
(BufferedStackTrace::FastUnwindStack): Fix code for PowerPC to
find the link register at an offset of 16 from the base of the
caller's stack frame.
2015-05-13 Michael Haubenwallner <michael.haubenwallner@ssi-schaefer.com>
* Makefile.in: Regenerated with automake-1.11.6.

11
libsanitizer/sanitizer_common/sanitizer_stacktrace.cc
View file

@ -86,7 +86,18 @@ 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) {
#ifdef __powerpc__
// 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];
#else
uhwptr pc1 = frame[1];
#endif
if (pc1 != pc) {
trace_buffer[size++] = (uptr) pc1;
}