// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2023 Arm Limited
 *
 * Verify that the POR_EL0 register context in signal frames is set up as
 * expected.
 */

#include <signal.h>
#include <ucontext.h>
#include <sys/auxv.h>
#include <sys/prctl.h>
#include <unistd.h>
#include <asm/sigcontext.h>

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

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

#define SYS_POR_EL0 "S3_3_C10_C2_4"

static uint64_t get_por_el0(void)
{
        uint64_t val;

        asm volatile(
                "mrs    %0, " SYS_POR_EL0 "\n"
                : "=r"(val)
                :
                : );

        return val;
}

int poe_present(struct tdescr *td, siginfo_t *si, ucontext_t *uc)
{
        struct _aarch64_ctx *head = GET_BUF_RESV_HEAD(context);
        struct poe_context *poe_ctx;
        size_t offset;
        bool in_sigframe;
        bool have_poe;
        __u64 orig_poe;

        have_poe = getauxval(AT_HWCAP2) & HWCAP2_POE;
        if (have_poe)
                orig_poe = get_por_el0();

        if (!get_current_context(td, &context.uc, sizeof(context)))
                return 1;

        poe_ctx = (struct poe_context *)
                get_header(head, POE_MAGIC, td->live_sz, &offset);

        in_sigframe = poe_ctx != NULL;

        fprintf(stderr, "POR_EL0 sigframe %s on system %s POE\n",
                in_sigframe ? "present" : "absent",
                have_poe ? "with" : "without");

        td->pass = (in_sigframe == have_poe);

        /*
         * Check that the value we read back was the one present at
         * the time that the signal was triggered.
         */
        if (have_poe && poe_ctx) {
                if (poe_ctx->por_el0 != orig_poe) {
                        fprintf(stderr, "POR_EL0 in frame is %llx, was %llx\n",
                                poe_ctx->por_el0, orig_poe);
                        td->pass = false;
                }
        }

        return 0;
}

struct tdescr tde = {
        .name = "POR_EL0",
        .descr = "Validate that POR_EL0 is present as expected",
        .timeout = 3,
        .run = poe_present,
};