// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019 ARM Limited
 *
 * Place a fake sigframe on the stack missing the mandatory FPSIMD
 * record: on sigreturn Kernel must spot this attempt and the test
 * case is expected to be terminated via SEGV.
 */

#include <stdio.h>
#include <signal.h>
#include <ucontext.h>

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

struct fake_sigframe sf;

static int fake_sigreturn_missing_fpsimd_run(struct tdescr *td,
                                             siginfo_t *si, ucontext_t *uc)
{
        size_t resv_sz, offset;
        struct _aarch64_ctx *head = GET_SF_RESV_HEAD(sf);

        /* just to fill the ucontext_t with something real */
        if (!get_current_context(td, &sf.uc, sizeof(sf.uc)))
                return 1;

        resv_sz = GET_SF_RESV_SIZE(sf);
        head = get_header(head, FPSIMD_MAGIC, resv_sz, &offset);
        if (head && resv_sz - offset >= HDR_SZ) {
                fprintf(stderr, "Mangling template header. Spare space:%zd\n",
                        resv_sz - offset);
                /* Just overwrite fpsmid_context */
                write_terminator_record(head);

                ASSERT_BAD_CONTEXT(&sf.uc);
                fake_sigreturn(&sf, sizeof(sf), 0);
        }

        return 1;
}

struct tdescr tde = {
                .name = "FAKE_SIGRETURN_MISSING_FPSIMD",
                .descr = "Triggers a sigreturn with a missing fpsimd_context",
                .sig_ok = SIGSEGV,
                .timeout = 3,
                .run = fake_sigreturn_missing_fpsimd_run,
};