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 <signal.h>
10 #include <ucontext.h>
11 #include <sys/prctl.h>
12
13 #include "test_signals_utils.h"
14 #include "testcases.h"
15
16 static union {
17 ucontext_t uc;
18 char buf[1024 * 128];
19 } context;
20 static unsigned int vls[SVE_VQ_MAX];
21 unsigned int nvls = 0;
22
sme_get_vls(struct tdescr * td)23 static bool sme_get_vls(struct tdescr *td)
24 {
25 int vq, vl;
26
27 /*
28 * Enumerate up to SME_VQ_MAX vector lengths
29 */
30 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
31 vl = prctl(PR_SME_SET_VL, vq * 16);
32 if (vl == -1)
33 return false;
34
35 vl &= PR_SME_VL_LEN_MASK;
36
37 /* Skip missing VLs */
38 vq = sve_vq_from_vl(vl);
39
40 vls[nvls++] = vl;
41 }
42
43 /* We need at least one VL */
44 if (nvls < 1) {
45 fprintf(stderr, "Only %d VL supported\n", nvls);
46 return false;
47 }
48
49 return true;
50 }
51
setup_za_regs(void)52 static void setup_za_regs(void)
53 {
54 /* smstart za; real data is TODO */
55 asm volatile(".inst 0xd503457f" : : : );
56 }
57
58 static char zeros[ZA_SIG_REGS_SIZE(SVE_VQ_MAX)];
59
do_one_sme_vl(struct tdescr * td,siginfo_t * si,ucontext_t * uc,unsigned int vl)60 static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
61 unsigned int vl)
62 {
63 size_t offset;
64 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
65 struct za_context *za;
66
67 fprintf(stderr, "Testing VL %d\n", vl);
68
69 if (prctl(PR_SME_SET_VL, vl) != vl) {
70 fprintf(stderr, "Failed to set VL\n");
71 return 1;
72 }
73
74 /*
75 * Get a signal context which should have a SVE frame and registers
76 * in it.
77 */
78 setup_za_regs();
79 if (!get_current_context(td, &context.uc, sizeof(context)))
80 return 1;
81
82 head = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), &offset);
83 if (!head) {
84 fprintf(stderr, "No ZA context\n");
85 return 1;
86 }
87
88 za = (struct za_context *)head;
89 if (za->vl != vl) {
90 fprintf(stderr, "Got VL %d, expected %d\n", za->vl, vl);
91 return 1;
92 }
93
94 if (head->size != ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(vl))) {
95 fprintf(stderr, "ZA context size %u, expected %lu\n",
96 head->size, ZA_SIG_CONTEXT_SIZE(sve_vq_from_vl(vl)));
97 return 1;
98 }
99
100 fprintf(stderr, "Got expected size %u and VL %d\n",
101 head->size, za->vl);
102
103 /* We didn't load any data into ZA so it should be all zeros */
104 if (memcmp(zeros, (char *)za + ZA_SIG_REGS_OFFSET,
105 ZA_SIG_REGS_SIZE(sve_vq_from_vl(za->vl))) != 0) {
106 fprintf(stderr, "ZA data invalid\n");
107 return 1;
108 }
109
110 return 0;
111 }
112
sme_regs(struct tdescr * td,siginfo_t * si,ucontext_t * uc)113 static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
114 {
115 int i;
116
117 for (i = 0; i < nvls; i++) {
118 if (do_one_sme_vl(td, si, uc, vls[i]))
119 return 1;
120 }
121
122 td->pass = 1;
123
124 return 0;
125 }
126
127 struct tdescr tde = {
128 .name = "ZA register",
129 .descr = "Check that we get the right ZA registers reported",
130 .feats_required = FEAT_SME,
131 .timeout = 3,
132 .init = sme_get_vls,
133 .run = sme_regs,
134 };
135
