sve_vl.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Copyright (C) 2021 ARM Limited
 4 *
 5 * Check that the SVE vector length reported in signal contexts is the
 6 * expected one.
 7 */
 8
 9#include <signal.h>
10#include <ucontext.h>
11#include <sys/prctl.h>
12
13#include "test_signals_utils.h"
14#include "testcases.h"
15
16struct fake_sigframe sf;
17unsigned int vl;
18
19static bool get_sve_vl(struct tdescr *td)
20{
21	int ret = prctl(PR_SVE_GET_VL);
22	if (ret == -1)
23		return false;
24
25	vl = ret;
26
27	return true;
28}
29
30static int sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
31{
32	size_t resv_sz, offset;
33	struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);
34	struct sve_context *sve;
35
36	/* Get a signal context which should have a SVE frame in it */
37	if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
38		return 1;
39
40	resv_sz = GET_SF_RESV_SIZE(sf);
41	head = get_header(head, SVE_MAGIC, resv_sz, &offset);
42	if (!head) {
43		fprintf(stderr, "No SVE context\n");
44		return 1;
45	}
46	sve = (struct sve_context *)head;
47
48	if (sve->vl != vl) {
49		fprintf(stderr, "sigframe VL %u, expected %u\n",
50			sve->vl, vl);
51		return 1;
52	} else {
53		fprintf(stderr, "got expected VL %u\n", vl);
54	}
55
56	td->pass = 1;
57
58	return 0;
59}
60
61struct tdescr tde = {
62	.name = "SVE VL",
63	.descr = "Check that we get the right SVE VL reported",
64	.feats_required = FEAT_SVE,
65	.timeout = 3,
66	.init = get_sve_vl,
67	.run = sve_vl,
68};