za_no_regs.c

  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
 18static union {
 19	ucontext_t uc;
 20	char buf[1024 * 128];
 21} context;
 22
 23static 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
 36static 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
 82static 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
 96struct 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};