examples/performance-thread/common/arch/arm64/ctx.c

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2017 Cavium, Inc
 */

#include <rte_common.h>
#include <ctx.h>

void
ctx_switch(struct ctx *new_ctx __rte_unused, struct ctx *curr_ctx __rte_unused)
{
    /* SAVE CURRENT CONTEXT */
    asm volatile (
        /* Save SP */
        "mov x3, sp\n"
        "str x3, [x1, #0]\n"

        /* Save FP and LR */
        "stp x29, x30, [x1, #8]\n"

        /* Save Callee Saved Regs x19 - x28 */
        "stp x19, x20, [x1, #24]\n"
        "stp x21, x22, [x1, #40]\n"
        "stp x23, x24, [x1, #56]\n"
        "stp x25, x26, [x1, #72]\n"
        "stp x27, x28, [x1, #88]\n"

        /*
         * Save bottom 64-bits of Callee Saved
         * SIMD Regs v8 - v15
         */
        "stp d8, d9, [x1, #104]\n"
        "stp d10, d11, [x1, #120]\n"
        "stp d12, d13, [x1, #136]\n"
        "stp d14, d15, [x1, #152]\n"
    );

    /* RESTORE NEW CONTEXT */
    asm volatile (
        /* Restore SP */
        "ldr x3, [x0, #0]\n"
        "mov sp, x3\n"

        /* Restore FP and LR */
        "ldp x29, x30, [x0, #8]\n"

        /* Restore Callee Saved Regs x19 - x28 */
        "ldp x19, x20, [x0, #24]\n"
        "ldp x21, x22, [x0, #40]\n"
        "ldp x23, x24, [x0, #56]\n"
        "ldp x25, x26, [x0, #72]\n"
        "ldp x27, x28, [x0, #88]\n"

        /*
         * Restore bottom 64-bits of Callee Saved
         * SIMD Regs v8 - v15
         */
        "ldp d8, d9, [x0, #104]\n"
        "ldp d10, d11, [x0, #120]\n"
        "ldp d12, d13, [x0, #136]\n"
        "ldp d14, d15, [x0, #152]\n"
    );
}