exec_target.c

 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
10int main(void)
11{
12	struct signatures signed_vals;
13	unsigned long hwcaps;
14	size_t val;
15
16	size_t size = fread(&val, sizeof(size_t), 1, stdin);
17
18	if (size != 1) {
19		fprintf(stderr, "Could not read input from stdin\n");
20		return EXIT_FAILURE;
21	}
22
23	/* don't try to execute illegal (unimplemented) instructions) caller
24	 * should have checked this and keep worker simple
25	 */
26	hwcaps = getauxval(AT_HWCAP);
27
28	if (hwcaps & HWCAP_PACA) {
29		signed_vals.keyia = keyia_sign(val);
30		signed_vals.keyib = keyib_sign(val);
31		signed_vals.keyda = keyda_sign(val);
32		signed_vals.keydb = keydb_sign(val);
33	}
34	signed_vals.keyg = (hwcaps & HWCAP_PACG) ?  keyg_sign(val) : 0;
35
36	fwrite(&signed_vals, sizeof(struct signatures), 1, stdout);
37
38	return 0;
39}