tools: fix testing/selftests/sigaltstack for s390x
On s390x the compilation of the file sas.c in directory tools/testing/selftests/sigaltstack fails with this error message: root@s35lp76 testing]# make selftests/sigaltstack/sas cc selftests/sigaltstack/sas.c -o selftests/sigaltstack/sas selftests/sigaltstack/sas.c: In function ‘my_usr1’: selftests/sigaltstack/sas.c:42:25: error: invalid register name for ‘sp’ register unsigned long sp asm("sp"); ^~ <builtin>: recipe for target 'selftests/sigaltstack/sas' failed make: *** [selftests/sigaltstack/sas] Error 1 [root@s35lp76 testing]# On s390x the stack pointer is register r15, the register name "sp" is unknown. Make this line platform dependend and use register r15. With this patch the compilation and test succeeds: [root@s35lp76 testing]# ./selftests/sigaltstack/sas TAP version 13 ok 1 Initial sigaltstack state was SS_DISABLE # [RUN] signal USR1 ok 2 sigaltstack is disabled in sighandler # [RUN] switched to user ctx # [RUN] signal USR2 # [OK] Stack preserved ok 3 sigaltstack is still SS_AUTODISARM after signal Pass 3 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0 1..3 [root@s35lp76 testing]# Signed-off-by: NThomas Richter <tmricht@linux.vnet.ibm.com> Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>
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