nsyscalls.test: add mips o32 support

Out-of-range syscalls looks differently on mips o32.

* tests/nsyscalls.c (main): Handle LINUX_MIPSO32.
* tests/nsyscalls.test: Trace syscall called "syscall" on mips.

tests/nsyscalls.c

@@ -71,9 +71,15 @@ main(void)
 	};
 
 	long rc = syscall(nr, a[0], a[1], a[2], a[3], a[4], a[5]);
+#ifdef LINUX_MIPSO32
+	printf("syscall(%#lx, %#lx, %#lx, %#lx, %#lx, %#lx, %#lx)"
+	       " = %ld ENOSYS (%m)\n", nr,
+	       a[0], a[1], a[2], a[3], a[4], a[5], rc);
+#else
 	printf("syscall_%lu(%#lx, %#lx, %#lx, %#lx, %#lx, %#lx)"
 	       " = %ld (errno %d)\n", nr & (~SYSCALL_BIT),
 	       a[0], a[1], a[2], a[3], a[4], a[5], rc, errno);
+#endif
 
 	puts("+++ exited with 0 +++");
 	return 0;

tests/nsyscalls.test

@@ -3,4 +3,10 @@
 # Check decoding of out-of-range syscalls.
 
 . "${srcdir=.}/init.sh"
-run_strace_match_diff -e trace=none
+
+case "$STRACE_ARCH" in
+	mips) syscall=syscall ;;
+	*) syscall=none ;;
+esac
+
+run_strace_match_diff -e trace=$syscall