1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 ARM Limited
4 *
5 * Verify that the ZA register context in signal frames is set up as
6 * expected.
7 */
8
9 #include <kselftest.h>
10 #include <signal.h>
11 #include <ucontext.h>
12 #include <sys/prctl.h>
13
14 #include "test_signals_utils.h"
15 #include "sve_helpers.h"
16 #include "testcases.h"
17
18 static union {
19 ucontext_t uc;
20 char buf[1024 * 128];
21 } context;
22
23 static bool sme_get_vls(struct tdescr *td)
24 {
25 int res = sve_fill_vls(VLS_USE_SME, 1);
26
27 if (!res)
28 return true;
29
30 if (res == KSFT_SKIP)
31 td->result = KSFT_SKIP;
32
33 return false;
34 }
35
36 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
37 unsigned int vl)
38 {
39 size_t offset;
40 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
41 struct za_context *za;
42
43 fprintf(stderr, "Testing VL %d\n", vl);
44
45 if (prctl(PR_SME_SET_VL, vl) != vl) {
46 fprintf(stderr, "Failed to set VL\n");
47 return 1;
48 }
49
50 /*
51 * Get a signal context which should have a SVE frame and registers
52 * in it.
53 */
54 if (!get_current_context(td, &context.uc, sizeof(context)))
55 return 1;
56
57 head = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), &offset);
58 if (!head) {
59 fprintf(stderr, "No ZA context\n");
60 return 1;
61 }
62
63 za = (struct za_context *)head;
64 if (za->vl != vl) {
65 fprintf(stderr, "Got VL %d, expected %d\n", za->vl, vl);
66 return 1;
67 }
68
69 if (head->size != ZA_SIG_REGS_OFFSET) {
70 fprintf(stderr, "Context size %u, expected %lu\n",
71 head->size, ZA_SIG_REGS_OFFSET);
72 return 1;
73 }
74
75 /* The actual size validation is done in get_current_context() */
76 fprintf(stderr, "Got expected size %u and VL %d\n",
77 head->size, za->vl);
78
79 return 0;
80 }
81
82 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
83 {
84 int i;
85
86 for (i = 0; i < nvls; i++) {
87 if (do_one_sme_vl(td, si, uc, vls[i]))
88 return 1;
89 }
90
91 td->pass = 1;
92
93 return 0;
94 }
95
96 struct tdescr tde = {
97 .name = "ZA registers - ZA disabled",
98 .descr = "Check ZA context with ZA disabled",
99 .feats_required = FEAT_SME,
100 .timeout = 3,
101 .init = sme_get_vls,
102 .run = sme_regs,
103 };
104
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