问题描述
我正在使用 nasm、cl.exe 和 win32 API 调用为 windows 编写 x86-64 程序集的游戏。我的应用程序成功创建了一个窗口,但它没有正确的大小和位置(它非常高但水平方向很窄)。
这是我的代码的一部分,用于创建窗口并在使用 HINSTANCE
获取 GetModuleHandleA(NULL)
并使用 RegisterClassA
注册窗口类后显示它。
; Create The Window
mov RCX,0 ; dwExStyle
mov RDX,WindowClassName ; lpClassName
MOV R8,WindowName ; lpWindowName
MOV R9,13565952 ; dwStyle
sub rsp,48
mov qword[rbp - 48],0 ; lpParam
mov RAX,qword[HINSTANCE] ;
mov qword[rbp - 40],RAX ; hInstance
mov qword[rbp - 32],0 ; hMenu
mov qword[rbp - 24],0 ; hWndParent
mov dword[rbp - 16],1080 ; nHeight
mov dword[rbp - 12],1920 ; nWidth
mov dword[rbp - 8],100 ; Y
mov dword[rbp - 4],100 ; X
call CreateWindowExA
mov qword[HWND],RAX ; Save the window handle
; Show The Window
mov RCX,qword[HWND]
mov RDX,5 ; SW_SHOW
call ShowWindow
我在二进制 ninja 中查看了它,我告诉我只有 6 个第一个参数被传递给 CreateWindowExA
。我查看了 Microsoft's x64 calling convention,但没有发现任何问题。
根据它,参数是这样传递的:
CreateWindowExA(dwExStyle: 0,lpClassName: 0x403010,lpWindowName: 0x403023,dwStyle: 0xcf0000,X: 0x438,Y: 0x64)
。我确实注意到 X 的值是错误的,但我也不明白为什么。
预先感谢您可能给我的任何帮助!
如果有帮助,这是我的完整代码:
global _start
extern GetModuleHandleA
extern RegisterClassA
extern DefWindowProcA
extern CreateWindowExA
extern ShowWindow
extern PeekMessageA
extern TranslateMessage
extern DispatchMessageA
section .text
_start:
; Prologue
push rbp
mov rbp,rsp
; Get hInstance
xor RCX,RCX
call GetModuleHandleA
mov qword[HINSTANCE],RAX ; Save hInstance
; Register The Window Class
mov dword[WNDCLASSA],3 ; style
mov qword[WNDCLASSA + 8],DefWindowProcA ; lpfnWndProc
mov dword[WNDCLASSA + 12],0 ; cbClsExtra
mov dword[WNDCLASSA + 16],0 ; cbWndExtra
mov RAX,qword[HINSTANCE]
mov qword[WNDCLASSA + 24],RAX ; hInstance
mov qword[WNDCLASSA + 32],0 ; hIcon
mov qword[WNDCLASSA + 40],0 ; hCursor
mov qword[WNDCLASSA + 48],0 ; hbrBackground
mov qword[WNDCLASSA + 56],0 ; lpszMenuName
mov qword[WNDCLASSA + 64],WindowClassName ; lpszClassName
lea RCX,WNDCLASSA
call RegisterClassA
; Create The Window
mov RCX,0 ; dwExStyle
mov RDX,WindowClassName ; lpClassName
MOV R8,WindowName ; lpWindowName
MOV R9,13565952 ; dwStyle
sub rsp,48
mov qword[rbp - 48],0 ; lpParam
mov RAX,qword[HINSTANCE] ;
mov qword[rbp - 40],RAX ; hInstance
mov qword[rbp - 32],0 ; hMenu
mov qword[rbp - 24],0 ; hWndParent
mov dword[rbp - 16],1080 ; nHeight
mov dword[rbp - 12],1920 ; nWidth
mov dword[rbp - 8],100 ; Y
mov dword[rbp - 4],100 ; X
call CreateWindowExA
mov qword[HWND],RAX ; Save the window handle
; Show The Window
mov RCX,qword[HWND]
mov RDX,5
call ShowWindow
a:
jmp a
; Message Loop
message_loop:
LEA RCX,MSG
mov RDX,qword[HWND]
mov R8,0
mov R9,0
sub rsp,4
mov dword[rbp - 4],1
call PeekMessageA
LEA RCX,MSG
call TranslateMessage
LEA RCX,MSG
call DispatchMessageA
jmp message_loop
; Epilogue
mov rsp,rbp
pop rbp
ret
section .data
HINSTANCE dq 0
HWND dq 0
WindowClassName db 'Polar Window Class',0
WindowName db 'Polar Window',0
section .bss
WNDCLASSA resb 72
MSG resb 48
解决方法
我的代码有很多问题,所以我找不到解决所有问题的问题。因此,这是我在评论的帮助下解决我的问题的方法(谢谢)。我没有分配影子空间,也没有将放在堆栈上的参数对齐到 8 个字节。我的汇编代码现在看起来像这样(未优化且无异常处理):
global _start
extern GetModuleHandleA
extern RegisterClassA
extern DefWindowProcA
extern CreateWindowExA
extern ShowWindow
extern PeekMessageA
extern TranslateMessage
extern DispatchMessageA
section .text
_start:
; Prologue
push rbp
mov rbp,rsp
; Get hInstance
xor RCX,RCX
call GetModuleHandleA
mov qword[HINSTANCE],RAX ; Save hInstance
; Register The Window Class
mov dword[WNDCLASSA],3 ; style
mov qword[WNDCLASSA + 8],DefWindowProcA ; lpfnWndProc
mov dword[WNDCLASSA + 12],0 ; cbClsExtra
mov dword[WNDCLASSA + 16],0 ; cbWndExtra
mov RAX,qword[HINSTANCE]
mov qword[WNDCLASSA + 24],RAX ; hInstance
mov qword[WNDCLASSA + 32],0 ; hIcon
mov qword[WNDCLASSA + 40],0 ; hCursor
mov qword[WNDCLASSA + 48],0 ; hbrBackground
mov qword[WNDCLASSA + 56],0 ; lpszMenuName
mov qword[WNDCLASSA + 64],WindowClassName ; lpszClassName
lea RCX,WNDCLASSA
sub rsp,0x20 ; Shadow Space
call RegisterClassA
add rsp,0x20 ; Shadow Space
; Create The Window
xor RCX,RCX ; dwExStyle
mov RDX,WindowClassName ; lpClassName
MOV R8,WindowName ; lpWindowName
MOV R9,13565952 ; dwStyle
sub rsp,96
mov qword[rsp + 20h + 56],0 ; lpParam
mov RAX,qword[HINSTANCE] ;
mov qword[rsp + 20h + 48],RAX ; hInstance
mov qword[rsp + 20h + 40],0 ; hMenu
mov qword[rsp + 20h + 32],0 ; hWndParent
mov qword[rsp + 20h + 24],1080 ; nHeight
mov qword[rsp + 20h + 16],1920 ; nWidth
mov qword[rsp + 20h + 8],100 ; Y
mov qword[rsp + 20h],100 ; X
call CreateWindowExA
add rsp,96
mov qword[HWND],RAX ; Save the window handle
; Show The Window
sub rsp,0x20
mov RCX,qword[HWND]
mov RDX,5
call ShowWindow
add rsp,0x20
; Message Loop
message_loop:
sub rsp,48
LEA RCX,[MSG]
mov RDX,qword[HWND]
mov R8,0
mov R9,0
mov qword[rsp + 20h],1
call PeekMessageA
add rsp,48
sub rsp,32
LEA RCX,[MSG]
call TranslateMessage
LEA RCX,[MSG]
call DispatchMessageA
add rsp,32
jmp message_loop
; Epilogue
mov rsp,rbp
pop rbp
ret
section .data
HINSTANCE dq 0
HWND dq 0
WindowClassName db 'Polar Window Class',0
WindowName db 'Polar Window',0
section .bss
WNDCLASSA resb 72
MSG resb 48