| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /* |
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| 3 | * Copyright 2016, Michael Ellerman, IBM Corp. |
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| 4 | */ |
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| 5 | |
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| 6 | #include <stdio.h> |
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| 7 | #include <stdlib.h> |
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| 8 | #include <string.h> |
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| 9 | #include <sys/mman.h> |
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| 10 | #include <unistd.h> |
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| 11 | |
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| 12 | #include <asm/cputable.h> |
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| 13 | |
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| 14 | #include "utils.h" |
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| 15 | |
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| 16 | #define SIZE (64 * 1024) |
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| 17 | |
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| 18 | int test_prot_sao(void) |
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| 19 | { |
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| 20 | char *p; |
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| 21 | |
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| 22 | /* |
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| 23 | * SAO was introduced in 2.06 and removed in 3.1. It's disabled in |
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| 24 | * guests/LPARs by default, so also skip if we are running in a guest. |
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| 25 | */ |
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| 26 | SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06) || |
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| 27 | have_hwcap2(PPC_FEATURE2_ARCH_3_1) || |
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| 28 | access("/proc/device-tree/rtas/ibm,hypertas-functions" , F_OK) == 0); |
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| 29 | |
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| 30 | /* |
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| 31 | * Ensure we can ask for PROT_SAO. |
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| 32 | * We can't really verify that it does the right thing, but at least we |
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| 33 | * confirm the kernel will accept it. |
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| 34 | */ |
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| 35 | p = mmap(NULL, SIZE, PROT_READ | PROT_WRITE | PROT_SAO, |
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| 36 | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); |
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| 37 | FAIL_IF(p == MAP_FAILED); |
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| 38 | |
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| 39 | /* Write to the mapping, to at least cause a fault */ |
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| 40 | memset(p, 0xaa, SIZE); |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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| 45 | int main(void) |
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| 46 | { |
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| 47 | return test_harness(test_prot_sao, "prot-sao" ); |
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| 48 | } |
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| 49 | |
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