glibc/sysdeps/s390
Stefan Liebler 8beba15d53 S390: Add cfi information for start routines in order to stop unwinding.
GDB failed to detect the outermost frame while showing the backtrace
within a thread:
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Before this patch, the start routines like thread_start had no cfi information.
GDB is then using the prologue unwinder if no cfi information is available.
This unwinder tries to unwind r15 and stops e.g. if r15 was updated or
on some jump-instructions.

On older glibc-versions (before commit "Remove cached PID/TID in clone"
c579f48edb), the thread_start function used
such a jump-instruction and GDB did not fail with an error.

This patch adds cfi information for _start, thread_start and __makecontext_ret
and marks r14 as undefined which marks the frame as outermost frame and GDB
stops the backtrace. Also tested different gcc versions in order to test
_Unwind_Backtrace() in libgcc as this is used by backtrace() in glibc.

ChangeLog:

	* sysdeps/s390/s390-64/start.S (_start): Add cfi information for r14.
	* sysdeps/s390/s390-32/start.S: (_start): Likewise
	* sysdeps/unix/sysv/linux/s390/s390-64/clone.S
	(thread_start): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/clone.S
	(thread_start): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/__makecontext_ret.S
	(__makecontext_ret): Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S
	(__makecontext_ret): Likewise.
2017-11-21 08:45:28 +01:00
..
bits Remove bits/string.h. 2017-06-20 08:21:24 -04:00
fpu S390: Regenerate ULPs 2017-10-05 12:50:49 +02:00
multiarch S390: Use cu21 instruction for converting from utf16 to utf8. 2017-06-27 17:09:43 +02:00
nptl nptl: Define __PTHREAD_MUTEX_{NUSERS_AFTER_KIND,USE_UNION} 2017-11-07 09:48:41 -02:00
s390-32 S390: Add cfi information for start routines in order to stop unwinding. 2017-11-21 08:45:28 +01:00
s390-64 S390: Add cfi information for start routines in order to stop unwinding. 2017-11-21 08:45:28 +01:00
abort-instr.h S390: Use __asm__ instead of asm. 2015-11-20 08:56:40 +01:00
asm-syntax.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
atomic-machine.h Optimize generic spinlock code and use C11 like atomic macros. 2017-06-06 09:41:56 +02:00
configure Require binutils 2.25 or later to build glibc. 2017-06-28 11:31:50 +00:00
configure.ac Require binutils 2.25 or later to build glibc. 2017-06-28 11:31:50 +00:00
dl-irel.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
dl-procinfo.c S390: Add new s390 platform z14. 2017-08-15 14:00:07 +02:00
dl-procinfo.h S390: Add new s390 platform z14. 2017-08-15 14:00:07 +02:00
dl-tls.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
ffs.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
fix-fp-int-convert-overflow.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gconv-modules Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Implies * math/divtc3.c: New file. 2006-02-01 03:02:06 +00:00
iso-8859-1_cp037_z900.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
ldsodefs.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
libc-tls.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
linkmap.h S390: Use DT_JUMPREL in prelink undo code. 2016-07-06 15:22:35 +02:00
longjmp.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
Makefile Rename cppflags-iterator.mk to libof-iterator.mk, remove extra-modules.mk. 2017-05-09 07:06:29 -04:00
mempcpy.S Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
preconfigure Move base_machine and machine settings from configure.ac to sysdeps preconfigure fragments. 2014-06-25 17:52:56 +00:00
sotruss-lib.c Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
string_private.h Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
utf8-utf16-z9.c S390: Use cu21 instruction for converting from utf16 to utf8. 2017-06-27 17:09:43 +02:00
utf8-utf32-z9.c S390: Use cu41 instruction for converting from utf32 to utf8. 2017-06-27 17:09:42 +02:00
utf16-utf32-z9.c S390: Use cu24 instruction for converting from utf16 to utf32. 2017-06-27 17:09:43 +02:00
Versions S/390: Revert the jmp_buf/ucontext_t ABI change. 2014-07-31 20:04:54 +02:00