1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2021 ARM Limited
4  *
5  * Verify that using an instruction not supported in streaming mode
6  * traps when in streaming mode.
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 
enable_za(void)21 static void enable_za(void)
22 {
23 	/* smstart za; real data is TODO */
24 	asm volatile(".inst 0xd503457f" : : : );
25 }
26 
zt_regs_run(struct tdescr * td,siginfo_t * si,ucontext_t * uc)27 int zt_regs_run(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
28 {
29 	size_t offset;
30 	struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
31 	struct zt_context *zt;
32 	char *zeros;
33 
34 	/*
35 	 * Get a signal context which should have a ZT frame and registers
36 	 * in it.
37 	 */
38 	enable_za();
39 	if (!get_current_context(td, &context.uc, sizeof(context)))
40 		return 1;
41 
42 	head = get_header(head, ZT_MAGIC, GET_BUF_RESV_SIZE(context), &offset);
43 	if (!head) {
44 		fprintf(stderr, "No ZT context\n");
45 		return 1;
46 	}
47 
48 	zt = (struct zt_context *)head;
49 	if (zt->nregs == 0) {
50 		fprintf(stderr, "Got context with no registers\n");
51 		return 1;
52 	}
53 
54 	fprintf(stderr, "Got expected size %u for %d registers\n",
55 		head->size, zt->nregs);
56 
57 	/* We didn't load any data into ZT so it should be all zeros */
58 	zeros = malloc(ZT_SIG_REGS_SIZE(zt->nregs));
59 	if (!zeros) {
60 		fprintf(stderr, "Out of memory, nregs=%u\n", zt->nregs);
61 		return 1;
62 	}
63 	memset(zeros, 0, ZT_SIG_REGS_SIZE(zt->nregs));
64 
65 	if (memcmp(zeros, (char *)zt + ZT_SIG_REGS_OFFSET,
66 		   ZT_SIG_REGS_SIZE(zt->nregs)) != 0) {
67 		fprintf(stderr, "ZT data invalid\n");
68 		free(zeros);
69 		return 1;
70 	}
71 
72 	free(zeros);
73 
74 	td->pass = 1;
75 
76 	return 0;
77 }
78 
79 struct tdescr tde = {
80 	.name = "ZT register data",
81 	.descr = "Validate that ZT is present and has data when ZA is enabled",
82 	.feats_required = FEAT_SME2,
83 	.timeout = 3,
84 	.sanity_disabled = true,
85 	.run = zt_regs_run,
86 };
87