xref: /linux/tools/testing/selftests/arm64/pauth/exec_target.c (revision a4eb44a6435d6d8f9e642407a4a06f65eb90ca04)
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ARM Limited
3 
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <sys/auxv.h>
7 
8 #include "helper.h"
9 
10 int main(void)
11 {
12 	struct signatures signed_vals;
13 	unsigned long hwcaps;
14 	size_t val;
15 
16 	fread(&val, sizeof(size_t), 1, stdin);
17 
18 	/* don't try to execute illegal (unimplemented) instructions) caller
19 	 * should have checked this and keep worker simple
20 	 */
21 	hwcaps = getauxval(AT_HWCAP);
22 
23 	if (hwcaps & HWCAP_PACA) {
24 		signed_vals.keyia = keyia_sign(val);
25 		signed_vals.keyib = keyib_sign(val);
26 		signed_vals.keyda = keyda_sign(val);
27 		signed_vals.keydb = keydb_sign(val);
28 	}
29 	signed_vals.keyg = (hwcaps & HWCAP_PACG) ?  keyg_sign(val) : 0;
30 
31 	fwrite(&signed_vals, sizeof(struct signatures), 1, stdout);
32 
33 	return 0;
34 }
35