1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2021 ARM Limited
4  *
5  * Check that the SME 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 
16 struct fake_sigframe sf;
17 unsigned int vl;
18 
get_sme_vl(struct tdescr * td)19 static bool get_sme_vl(struct tdescr *td)
20 {
21 	int ret = prctl(PR_SME_GET_VL);
22 	if (ret == -1)
23 		return false;
24 
25 	vl = ret;
26 
27 	return true;
28 }
29 
sme_vl(struct tdescr * td,siginfo_t * si,ucontext_t * uc)30 static int sme_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 za_context *za;
35 
36 	/* Get a signal context which should have a ZA 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, ZA_MAGIC, resv_sz, &offset);
42 	if (!head) {
43 		fprintf(stderr, "No ZA context\n");
44 		return 1;
45 	}
46 	za = (struct za_context *)head;
47 
48 	if (za->vl != vl) {
49 		fprintf(stderr, "ZA sigframe VL %u, expected %u\n",
50 			za->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 
61 struct tdescr tde = {
62 	.name = "SME VL",
63 	.descr = "Check that we get the right SME VL reported",
64 	.feats_required = FEAT_SME,
65 	.timeout = 3,
66 	.init = get_sme_vl,
67 	.run = sme_vl,
68 };
69