// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2021 ARM Limited
 *
 * Verify that the ZA register context in signal frames is set up as
 * expected.
 */

#include <kselftest.h>
#include <signal.h>
#include <ucontext.h>
#include <sys/prctl.h>

#include "test_signals_utils.h"
#include "sve_helpers.h"
#include "testcases.h"

static union {
        ucontext_t uc;
        char buf[1024 * 128];
} context;

static bool sme_get_vls(struct tdescr *td)
{
        int res = sve_fill_vls(VLS_USE_SME, 1);

        if (!res)
                return true;

        if (res == KSFT_SKIP)
                td->result = KSFT_SKIP;

        return false;
}

static int do_one_sme_vl(struct tdescr *td, siginfo_t *si, ucontext_t *uc,
                         unsigned int vl)
{
        size_t offset;
        struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
        struct za_context *za;

        fprintf(stderr, "Testing VL %d\n", vl);

        if (prctl(PR_SME_SET_VL, vl) != vl) {
                fprintf(stderr, "Failed to set VL\n");
                return 1;
        }

        /*
         * Get a signal context which should have a SVE frame and registers
         * in it.
         */
        if (!get_current_context(td, &context.uc, sizeof(context)))
                return 1;

        head = get_header(head, ZA_MAGIC, GET_BUF_RESV_SIZE(context), &offset);
        if (!head) {
                fprintf(stderr, "No ZA context\n");
                return 1;
        }

        za = (struct za_context *)head;
        if (za->vl != vl) {
                fprintf(stderr, "Got VL %d, expected %d\n", za->vl, vl);
                return 1;
        }

        if (head->size != ZA_SIG_REGS_OFFSET) {
                fprintf(stderr, "Context size %u, expected %lu\n",
                        head->size, ZA_SIG_REGS_OFFSET);
                return 1;
        }

        /* The actual size validation is done in get_current_context() */
        fprintf(stderr, "Got expected size %u and VL %d\n",
                head->size, za->vl);

        return 0;
}

static int sme_regs(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
        int i;

        for (i = 0; i < nvls; i++) {
                if (do_one_sme_vl(td, si, uc, vls[i]))
                        return 1;
        }

        td->pass = 1;

        return 0;
}

struct tdescr tde = {
        .name = "ZA registers - ZA disabled",
        .descr = "Check ZA context with ZA disabled",
        .feats_required = FEAT_SME,
        .timeout = 3,
        .init = sme_get_vls,
        .run = sme_regs,
};