/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2018 The FreeBSD Foundation
 *
 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <machine/asmacros.h>

#include "assym.inc"

        .text
ENTRY(efi_rt_arch_call)
        pushq   %rbp
        movq    %rsp, %rbp

        movq    %rbx, EC_RBX(%rdi)
        movq    %rsp, EC_RSP(%rdi)
        movq    %rbp, EC_RBP(%rdi)
        movq    %r12, EC_R12(%rdi)
        movq    %r13, EC_R13(%rdi)
        movq    %r14, EC_R14(%rdi)
        movq    %r15, EC_R15(%rdi)
        pushfq
        popq    %rax
        movq    %rax, EC_RFLAGS(%rdi)
        movq    PCPU(CURTHREAD), %rax
        movq    %rdi, TD_MD+MD_EFIRT_TMP(%rax)
        movq    PCPU(CURPCB), %rsi

        movl    EC_ARGCNT(%rdi), %ecx
        movl    %ecx, %ebx
        movl    $4, %eax
        cmpl    %eax, %ecx
        cmovbl  %eax, %ecx
        shll    $3, %ecx
        subq    %rcx, %rsp
        andq    $~0xf, %rsp

        cmpl    $0, %ebx
        jz      1f
        movq    EC_ARG1(%rdi), %rcx
        decl    %ebx
        jz      1f
        movq    EC_ARG2(%rdi), %rdx
        decl    %ebx
        jz      1f
        movq    EC_ARG3(%rdi), %r8
        decl    %ebx
        jz      1f
        movq    EC_ARG4(%rdi), %r9
        decl    %ebx
        jz      1f
        movq    EC_ARG5(%rdi), %rax
        movq    %rax, 4*8(%rsp)
        decl    %ebx
        jz      1f
        movq    $efi_rt_panic_str, %rdi
        call    panic
1:      movq    EC_FPTR(%rdi), %rax
        movq    $efi_rt_fault, PCB_ONFAULT(%rsi)
        callq   *%rax

        movq    PCPU(CURTHREAD), %rbx
        movq    TD_MD+MD_EFIRT_TMP(%rbx), %rdi
        movq    %rax, EC_EFI_STATUS(%rdi)
        movq    PCPU(CURPCB), %rsi
        xorl    %eax, %eax
        movq    %rax, PCB_ONFAULT(%rsi)

efi_rt_arch_call_tail:
        movq    EC_R15(%rdi), %r15
        movq    EC_R14(%rdi), %r14
        movq    EC_R13(%rdi), %r13
        movq    EC_R12(%rdi), %r12
        movq    EC_RBP(%rdi), %rbp
        movq    EC_RSP(%rdi), %rsp
        movq    EC_RBX(%rdi), %rbx
        pushq   EC_RFLAGS(%rdi)
        popfq

        popq    %rbp
        ret
END(efi_rt_arch_call)

ENTRY(efi_rt_fault)
        xorl    %eax, %eax
        movq    PCPU(CURPCB), %rsi
        movq    %rax, PCB_ONFAULT(%rsi)
        movl    $EFAULT, %eax
        movq    PCPU(CURTHREAD), %rbx
        movq    TD_MD+MD_EFIRT_TMP(%rbx), %rdi
        jmp     efi_rt_arch_call_tail
END(efi_rt_fault)

efi_rt_panic_str:       .asciz  "efi_rt_arch_call: too many args"

        .section .note.GNU-stack,"",%progbits