Differential D16972 Diff 47598 head/sys/amd64/amd64/efirt_support.S

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head/sys/amd64/amd64/efirt_support.S

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2018 The FreeBSD Foundation
				* All rights reserved.
				*
				* 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.
				*
				* $FreeBSD$
				*/

				#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)
				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

				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

				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"