On s390x the compilation of the file sas.c in directory
tools/testing/selftests/sigaltstack fails with this error message:
[root@s8360046 sigaltstack]# make
gcc -Wall sas.c -o /root/linux/tools/testing/selftests/sigaltstack/sas
sas.c: In function ‘my_usr1’:
sas.c:40:25: error: invalid register name for ‘sp’
register unsigned long sp asm("sp");
^~
../lib.mk:62: recipe for target '/root/linux/tools/testing/selftests/sigaltstack/sas' failed
make: *** [/root/linux/tools/testing/selftests/sigaltstack/sas] Error 1
[root@s8360046 sigaltstack]#
On s390x the stack pointer is register r15, the register name "sp"
is unknown.
Make this line platform dependend and use register r15.
Which this patch the compilation and test succeeds:
[root@s8360046 sigaltstack]# make
gcc -Wall sas.c -o /root/linux/tools/testing/selftests/sigaltstack/sas
[root@s8360046 sigaltstack]# ./sas
[OK] Initial sigaltstack state was SS_DISABLE
[RUN] signal USR1
[OK] sigaltstack is disabled in sighandler
[RUN] switched to user ctx
[RUN] signal USR2
[OK] Stack preserved
[OK] sigaltstack is still SS_AUTODISARM after signal
[OK] Test passed
[root@s8360046 sigaltstack]#
Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/sigaltstack/sas.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/testing/selftests/sigaltstack/sas.c b/tools/testing/selftests/sigaltstack/sas.c
index ccd0734..4bbd19d 100644
--- a/tools/testing/selftests/sigaltstack/sas.c
+++ b/tools/testing/selftests/sigaltstack/sas.c
@@ -37,7 +37,11 @@ void my_usr1(int sig, siginfo_t *si, void *u)
stack_t stk;
struct stk_data *p;
+#if __s390x__
+ register unsigned long sp asm("%15");
+#else
register unsigned long sp asm("sp");
+#endif
if (sp < (unsigned long)sstack ||
sp >= (unsigned long)sstack + SIGSTKSZ) {
--
2.9.3
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