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MessageBox for 64-bits Windows or 32-bits Windows? FASM x64format binary as 'exe'
include 'win64a.inc'
struc dbs [data]
{
common
. db data
.size = $ - .
}
IMAGE_DOS_SIGNATURE equ 5A4Dh ;'MZ'
IMAGE_NT_SIGNATURE equ 00004550h ;'PE',0,0
PROCESSOR_AMD_X8664 equ 8664h
IMAGE_SCN_CNT_CODE equ 00000020h
IMAGE_SCN_MEM_WRITE equ 80000000h
IMAGE_SCN_MEM_READ equ 40000000h
IMAGE_SCN_CNT_INITIALIZED_DATA equ 00000040h
IMAGE_SUBSYSTEM_WINDOWS_GUI equ 2
IMAGE_NT_OPTIONAL_HDR64_MAGIC equ 20Bh
IMAGE_FILE_RELOCS_STRIPPED equ 1
IMAGE_FILE_EXECUTABLE_IMAGE equ 2
IMAGE_BASE equ 0x400000
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE equ 8000h
use64
org 0
;--------DOS-stub-------------------------------
Signature dw IMAGE_DOS_SIGNATURE,0
;-------PE-header--------------------------------------------------
ntHeader dd IMAGE_NT_SIGNATURE;'PE'
;image_header----
Machine dw PROCESSOR_AMD_X8664;CPU Type
Count_of_section dw 0;Number of sections
TimeStump dd 0;Information about the time when the PE-file was compiled
Symbol_table_offset dd 0;A pointer to the size of debug information
Symbol_table_count dd 0;A pointer to the COFF symbol table-PE-format
Size_of_optional_header dw begin-optional_header;The size of optional header
Characteristics dw IMAGE_FILE_RELOCS_STRIPPED or \
IMAGE_FILE_EXECUTABLE_IMAGE;file attributes
;-------Standard field NT
optional_header:
Magic_optional_header dw IMAGE_NT_OPTIONAL_HDR64_MAGIC;Status Display File
Linker_version_major_and_minor dw 9;Contain the linker version that created the file.
Size_of_code dd 0;The total size of the code sections
Size_of_init_data dd 0x70;The total size of initialized data
Size_of_uninit_data dd 0;The total size of the uninitialized data
entry_point dd start
base_of_code dd begin
;------Additional fields NT-----------------------------------------------
image_base dq IMAGE_BASE
section_alignment dd 4
file_alignment dd ntHeader
OS_version_major_minor dw 5,2
image_version_major_minor dd 0
subsystem_version_major_minor dw 5,2
Win32_version dd 0
size_of_image dd end_import
size_of_header dd begin
checksum dd 0
subsystem dw IMAGE_SUBSYSTEM_WINDOWS_GUI
DLL_flag dw IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
Stack_allocation dq 0x100000
Stack_commit dq 0x1000
Heap_allocation dq 0x100000
Heap_commit dq 0x1000
loader_flag dd 0
number_of_dirs dd (begin-export_RVA_size)/8
export_RVA_size dq 0
import_RVA_size dd _import,end_import-import
;--------code and data-----------------------------------------
begin:
MsgBoxText dbs 'Win64 Assembly is Great!',0
MsgCaption db "Win64 Iczelion's lesson #2: MessageBox",0
start:
push rbp; <-- not sub rsp,28h
xor ecx,ecx
mov edx,MsgBoxText+IMAGE_BASE
lea r8d,[rdx+MsgBoxText.size]; <-- not mov r8d,offset MsgCaption
xor r9d,r9d; MB_OK
call [MessageBox]
pop rbp
retn
;---------import---------------------------------------
Import_Table:
user32_table:
MessageBox dq _MessageBox
_import:
dd 0,0,0,user32_dll,user32_table,0
user32_dll db "user32",0,0 ;<-- not "user32.dll"
dw 0
_MessageBox db 0,0,"MessageBoxA"
end_import: