1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2016, Michael Ellerman, IBM Corp.
4  */
5 
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <string.h>
9 #include <sys/mman.h>
10 
11 #include <asm/cputable.h>
12 
13 #include "utils.h"
14 
15 #define SIZE (64 * 1024)
16 
17 int test_prot_sao(void)
18 {
19 	char *p;
20 
21 	/* 2.06 or later should support SAO */
22 	SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06));
23 
24 	/*
25 	 * Ensure we can ask for PROT_SAO.
26 	 * We can't really verify that it does the right thing, but at least we
27 	 * confirm the kernel will accept it.
28 	 */
29 	p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO,
30 		 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
31 	FAIL_IF(p == MAP_FAILED);
32 
33 	/* Write to the mapping, to at least cause a fault */
34 	memset(p, 0xaa, SIZE);
35 
36 	return 0;
37 }
38 
39 int main(void)
40 {
41 	return test_harness(test_prot_sao, "prot-sao");
42 }
43