;   crt0-efi-x86_64.S - x86_64 EFI startup code.
;   Copyright (C) 1999 Hewlett-Packard Co.
;	Contributed by David Mosberger <davidm@hpl.hp.com>.
;   Copyright (C) 2005 Intel Co.
;	Contributed by Fenghua Yu <fenghua.yu@intel.com>.
;
;    All rights reserved.
;
;    Redistribution and use in source and binary forms, with or without
;    modification, are permitted provided that the following conditions
;    are met:
;
;    * Redistributions of source code must retain the above copyright
;      notice, this list of conditions and the following disclaimer.
;    * 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.
;    * Neither the name of Hewlett-Packard Co. nor the names of its
;      contributors may be used to endorse or promote products derived
;      from this software without specific prior written permission.
;
;    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR CONTRIBUTORS
;    BE LIABLE FOR ANYDIRECT, 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.
;
;	2018-05-05 Converted to NASM syntax by Justin C. Miller

extern ImageBase
extern _DYNAMIC
extern _relocate
extern efi_main

section .text
align 4

global _start
_start:
	sub rsp, 8
	push rcx
	push rdx

	; These are already in RDI/RSI from EFI calling us, right? -justin
	;lea rdi, [ImageBase]
	;lea rsi, [_DYNAMIC]

	pop rcx
	pop rdx
	push rcx
	push rdx
	call _relocate

	pop rdi
	pop rsi

	call efi_main
	add rsp, 8

.exit:	
  	ret

; hand-craft a dummy .reloc section so EFI knows it's a relocatable executable:
section .data
dummy:
	dd 0


%define IMAGE_REL_ABSOLUTE	0

section .reloc
label1:
	dd 0							; Page RVA
 	dd 10							; Block Size (2*4+2)
	dw (IMAGE_REL_ABSOLUTE<<12) + 0	; reloc for dummy