S390: Sync ptrace.h with kernel. [BZ #21539]

This patch removes PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS
and PTRACE_SETFPREGS as these requests does not exist on s390 kernel.

But the kernel has support for PTRACE_SINGLEBLOCK,
PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA, PTRACE_POKEUSR_AREA,
PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE, PTRACE_DISABLE_TE and
PTRACE_TE_ABORT_RAND.  Thus those are defined now.

The current kernel s390 specific ptrace.h file also defines
PTRACE_PEEKTEXT_AREA, PTRACE_PEEKDATA_AREA, PTRACE_POKETEXT_AREA,
PTRACE_POKEDATA_AREA, PTRACE_PEEK_SYSTEM_CALL, PTRACE_POKE_SYSTEM_CALL
and PTRACE_PROT, but those requests are not supported.
Thus those defines are skipped in glibc ptrace.h.

There were old includes of ptrace.h in sysdeps/s390/fpu/fesetenv.c.
The ptrace feature isn't used there anymore, thus I removed the includes.

Before this patch, <glibc>/sysdeps/unix/sysv/linux/s390/sys/ptrace.h
uses ptrace-request 12 for PTRACE_GETREGS,
but <kernel>/include/uapi/linux/ptrace.h uses 12 for PTRACE_SINGLEBLOCK.

The s390 kernel has never had support for PTRACE_GETREGS!
Thus glibc ptrace.h is adjusted to match kernel ptrace.h.

The new s390 specific test ensures, that PTRACE_SINGLEBLOCK defined
in glibc works as expected.  If the kernel would interpret it as
PTRACE_GETREGS, then the testcase will not make any progress
and will time out.

ChangeLog:

	[BZ #21539]
	* NEWS: Mention s390 ptrace request changes.
	* sysdeps/unix/sysv/linux/s390/sys/ptrace.h
	(PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS,
	PTRACE_SETFPREGS): Remove enum constant.
	(PT_GETREGS, PT_SETREGS, PT_GETFPREGS, T_SETFPREGS):
	Remove defines.
	(PTRACE_SINGLEBLOCK): New enum constant.
	(PT_STEPBLOCK): New define.
	(PTRACE_PEEKUSR_AREA, PTRACE_POKEUSR_AREA,
	PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE, PTRACE_DISABLE_TE,
	PTRACE_TE_ABORT_RAND): New enum constant and define.
	* sysdeps/s390/fpu/fesetenv.c: Remove ptrace.h includes.
	* sysdeps/unix/sysv/linux/s390/tst-ptrace-singleblock.c:
	New file.
	* sysdeps/unix/sysv/linux/s390/Makefile: Add test.

1 files changed, 9 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 804c1b92e6..9ee22185e8 100644
--- a/NEWS
+++ b/NEWS
@@ -98,6 +98,15 @@ Version 2.26
 * The tunables feature is now enabled by default.  This allows users to tweak
   behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
 
+* The s390 specific ptrace requests are adjusted to the kernel ones.  Request 12
+  is now used for PTRACE_SINGLEBLOCK instead of PTRACE_GETREGS.  The requests
+  PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS were
+  removed as those are not supported by the s390 kernel.  The requests
+  PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
+  PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
+  PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND were added as those are supported
+  by the s390 kernel.
+
 Security related changes:
 
 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,