1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 ARM Limited
4 *
5 * Verify that the SVE 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 * 64];
19 } context;
20 static unsigned int vls[SVE_VQ_MAX];
21 unsigned int nvls = 0;
22
23 static bool sve_get_vls(struct tdescr *td)
24 {
25 int vq, vl;
26
27 /*
28 * Enumerate up to SVE_VQ_MAX vector lengths
29 */
30 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
31 vl = prctl(PR_SVE_SET_VL, vq * 16);
32 if (vl == -1)
33 return false;
34
35 vl &= PR_SVE_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
52 static void setup_sve_regs(void)
53 {
54 /* RDVL x16, #1 so we should have SVE regs; real data is TODO */
55 asm volatile(".inst 0x04bf5030" : : : "x16" );
56 }
57
58 static int do_one_sve_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
59 unsigned int vl)
60 {
61 size_t offset;
62 struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
63 struct sve_context *sve;
64
65 fprintf(stderr, "Testing VL %d\n", vl);
66
67 if (prctl(PR_SVE_SET_VL, vl) == -1) {
68 fprintf(stderr, "Failed to set VL\n");
69 return 1;
70 }
71
72 /*
73 * Get a signal context which should have a SVE frame and registers
74 * in it.
75 */
76 setup_sve_regs();
77 if (!get_current_context(td, &context.uc, sizeof(context)))
78 return 1;
79
80 head = get_header(head, SVE_MAGIC, GET_BUF_RESV_SIZE(context),
81 &offset);
82 if (!head) {
83 fprintf(stderr, "No SVE context\n");
84 return 1;
85 }
86
87 sve = (struct sve_context *)head;
88 if (sve->vl != vl) {
89 fprintf(stderr, "Got VL %d, expected %d\n", sve->vl, vl);
90 return 1;
91 }
92
93 /* The actual size validation is done in get_current_context() */
94 fprintf(stderr, "Got expected size %u and VL %d\n",
95 head->size, sve->vl);
96
97 return 0;
98 }
99
100 static int sve_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
101 {
102 int i;
103
104 for (i = 0; i < nvls; i++) {
105 if (do_one_sve_vl(td, si, uc, vls[i]))
106 return 1;
107 }
108
109 td->pass = 1;
110
111 return 0;
112 }
113
114 struct tdescr tde = {
115 .name = "SVE registers",
116 .descr = "Check that we get the right SVE registers reported",
117 .feats_required = FEAT_SVE,
118 .timeout = 3,
119 .init = sve_get_vls,
120 .run = sve_regs,
121 };
122
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