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Stefan Liebler 890b7a4b33 S390: Fix "backtrace() returns infinitely deep stack frames with makecontext()" [BZ #18508]. 
On s390/s390x backtrace(buffer, size) returns the series of called functions until
"makecontext_ret" and additional entries (up to "size") with "makecontext_ret".
GDB-backtrace is also warning:
"Backtrace stopped: previous frame identical to this frame (corrupt stack?)"

To reproduce this scenario you have to setup a new context with makecontext()
and activate it with setcontext(). See e.g. cf() function in testcase stdlib/tst-makecontext.c.
Or see bug in libgo "Bug 66303 - runtime.Caller() returns infinitely deep stack frames
on s390x " (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66303).

This patch omits the cfi_startproc/cfi_endproc directives in ENTRY/END macro of
__makecontext_ret. Thus no frame information is generated in .eh_frame and backtrace
stops after __makecontext_ret. There is also no .eh_frame info for _start or
thread_start functions.

ChangeLog:

	[BZ #18508]
	* stdlib/Makefile ($(objpfx)tst-makecontext3):
	Depend on $(libdl).
	* stdlib/tst-makecontext.c (cf): Test if _Unwind_Backtrace
	is not called infinitely times.
	(backtrace_helper): New function.
	(trace_arg): New struct.
	(st1): Enlarge stack size.
	* sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:
	(__makecontext_ret): Omit cfi_startproc and cfi_endproc.
	* sysdeps/unix/sysv/linux/s390/s390-64/__makecontext_ret.S:
	Likewise.
 		2015-07-07 16:11:14 +02:00
..
bits Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
sys
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Depend
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Makefile S390: Fix "backtrace() returns infinitely deep stack frames with makecontext()" [BZ #18508]. 2015-07-07 16:11:14 +02:00
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tst-limits.c Fix a couple of -Wundef warnings. 2014-12-29 23:14:38 -05:00
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tst-setcontext2.c S/390: Fix setcontext/swapcontext which are not restoring sigmask. 2015-03-12 11:08:11 +01:00
tst-setcontext3.c Bug 18125: Call exit after last linked context. 2015-05-08 11:29:38 -04:00
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tst-strtod-round-data Fix strtof decimal rounding close to half least subnormal (bug 18247). 2015-04-10 20:45:30 +00:00
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