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Delete drawpixel.asm
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[ORG 0x10000]
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[BITS 32]
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; assemble using 'nasm' assembler
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; C:>nasm header.asm -o simple.xbe
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; XBE HEADER PART ------------------------------------------------------------
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db 'XBEH'
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resb 0x100 ; reserve 100 bytes for the xbe security signature
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; This only matters on signed xbe's which are
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; ms authorised :)
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dd 0x10000 ; Base address of image
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dd 0x760 ; Size of header
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dd 0x7000 ; Size of image
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dd 0x178 ; Size of image header
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dd 0x3f16d3ce ; Time Date Stamp
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dd cert_header ; Certificate Address (plus offset)
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dd 0x1 ; Number of sections
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dd section_header ; Sectrion headers Address(plus offset)
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dd 0x1 ; Initialisation Flags
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dd 0x11100 ^ 0xA8FC57AB
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; Entry point (XOR with 0xA8FC57AB)
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; ***** Very important - this will be our entry
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; point for our code - which is the base address of
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; our file added to the actual file offset.
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dd 0x16000 ; Thread local storage directory address
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dd 0x0 ; Size of stack commit
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dd 0x0 ; Size of heap reserve
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dd 0x0 ; Size of heap commit
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dd 0x0 ; Original base address
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dd 0x0 ; Original size of image
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dd 0x0 ; Original checksum
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dd 0x3f16d3ce ; Original time date stamp
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dd debugpath ; Debug path name address
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dd debugpath
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dd szname
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dd 0x11000 ^ 0x5B6D40B6
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; Kernel image thunk address
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; We XOR the original address with 0x5B6D40B6
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dd 0x0 ; Non-kernel import directory address
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dd 0x0 ; Number of library versions
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dd 0x0 ; Library versions area addresses
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dd 0x3 ; Kernel library version address
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dd 0x0 ; XAPI library version address
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dd 0 ; Logo bitmap address
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dd 0 ; Logo bitmap size
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; Not included a logo bitmap for this simple example
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; and will still run without it, but you could encode
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; a really cool image logo for you app maybe :)
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; Note: - a lot of assemblers use "[ORG 0x354]" to align data within the assembled
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; file, but for nasm, you have to use: TIMES 0x178-($-$$), which implies
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; that everything from this line is from 0x178 in the file.
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; XBE CERTIFICATION ----------------------------------------------------------
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TIMES 0x178-($-$$) DB 0 ; I've aligned the certificate to exactly 0x178 in
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; the file, but you could exclude this if you want.
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cert_header:
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dd 0x1dc ; Size of Certification
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dd 0x3f16d3ce ; Date Stamp
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dd 0x0 ; Title ID
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resb 0x50 ; Title name null terminated string
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resb 0x40 ; Alt Title
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dd 0x0 ; Allowed Media
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dd 0x0 ; Game Region
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dd 0x0 ; Game Rating
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dd 0x0 ; Disk Number
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dd 0x0 ; version
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resb 0x10 ; Lan
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resb 0x10 ; Signature Key
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resb 0x100 ; Alt Sig
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; SECTION HEADERS ------------------------------------------------------------
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TIMES 0x354-($-$$) DB 0 ; Similar to the xbe cert header, I've aligned the
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; single section header to offset 0x354 exactly, but
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; you don't have to.
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section_header:
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dd 0x07 ; Flags
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dd 0x11000 ; Virtual Address (remember offset of 0x10000)
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dd 0x6000 ; Virutal Size
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dd 0x1000 ; File pointer to raw data
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dd 0x6000 ; Size of raw data
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dd section_name ; Address of the section name (Null terminated)
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dd 0x0 ;
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dd rc1 ; head_count_address
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dd rc2 ; tail_count_address
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debugpath:
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db 0x0,0x0,0x0,0x0,0x0,0,0,0,0,0,0,0,0,0,0
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szname:
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dw 'x','b','d','e','v',0,0,0
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rc1:
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dd 0
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rc2:
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dd 0
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section_name:
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db '.','t','e','x','t',0,0
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; 'OUR CODE'
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; THE SECTION WE DEFINED -----------------------------------------------------
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; This is the start of our section.. the start of our simple
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; code.
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; Its offset in the file is at 0x1000
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TIMES 0x1000-($-$$) DB 0
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section_1_start: ; this should be 0x11000 in memory when loaded
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; kernel thunk table
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MmAllocateContiguousMemoryEx:
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dd 0x80000000 + 166
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MmGetPhysicalAddress:
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dd 0x80000000 + 173
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NtAllocateVirtualMemory:
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dd 0x80000000 + 184
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dd 0 ; end of table
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; Entry point of our code - offset 0x1100 in the file.
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TIMES 0x1100-($-$$) DB 0x90 ; this should be 0x11100 in memory when loaded
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jmp start
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framebuffer:
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dd 0xf0010000 + 640*320 + 80;
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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DrawPixel:
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; Setup Function
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push ebp ; Setup our function
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mov ebp, esp
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; ecx = y;
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; ebx = x
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; ecx*=640
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; ecx = x+y*640
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mov ecx, DWORD [ebp+12] ; put y pos in ecx
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imul ecx, 640
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mov ebx, DWORD [ebp+8] ; put x pos int edx
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add ecx, ebx ; hence ecx = x+y*640
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mov ebx, DWORD [framebuffer] ; Get the location in memory
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; where we will put this pixel
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; e.g. framebuffer
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; Put blue pixel into memory
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mov eax, DWORD [ebp+16] ; put pixel colour in eax
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and eax, 255
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mov BYTE [ebx+ecx*4], al
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; Put green pixel into memory
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mov eax, DWORD [ebp+16] ; put pixel colour in edx
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and eax, 65280
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shr eax, 8
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mov BYTE [ebx+ecx*4+1], al
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; Put red pixel into memory
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mov eax, DWORD [ebp+16]
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and eax, 16711680
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shr eax, 16
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mov BYTE [ebx+ecx*4+2], al
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; tidy up and return from function call
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pop ebp
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ret 0
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; End of DrawPixel
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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; Globals
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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xpos:
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dd 310 ; width/2 = 640/2 = 310
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ypos:
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dd 240 ; height/2 = 480/2 = 240
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colour:
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dd 0xff0000 ; Red colour pixel
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xloop: ; We do a simple loop and draw a small line
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dd 0x50
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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start:
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;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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a_loop:
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; This is the same as DrawPixel(x, y, colour)
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push DWORD [colour]
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push DWORD [ypos]
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push DWORD [xpos]
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call DrawPixel
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add esp, 12
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; Increment the ypos.
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mov eax, [ypos]
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add eax, 1
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mov [ypos], eax
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; Loop around 100 times back to loopx - as sometimes people say...I can't see
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; the red pixel...so using this simple asm loop... we've managed to draw a
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; simple line :)
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mov eax, [xloop]
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dec eax
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mov [xloop],eax
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jne a_loop
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; Program has now finished, so we simply just stay here and loop :)
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bbb:
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jmp bbb;
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TIMES 0x6000-($-$$) DB 0x90 ; this will make our section finish at 0x6000
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; from the start of the file.
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TIMES 0x7000-($-$$) DB 0x0 ; And of course, this will make our file size
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; equal to 0x7000 a nice round number -
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; 0x7000 is 28672bytes... so if you assemble the file
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; you should find its that size exactly.
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