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@nicolas17
Last activeDecember 15, 2025 05:53
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    hello-world iOS app
    .global_main
    .extern_putchar
    .align4
    _main:
    ; prolog; save fp,lr,x19
    stp x29, x30,[sp, #-0x20]!
    str x19,[sp, #0x10]
    mov x29,sp
    ; make space for 2 dword local vars
    subsp,sp, #0x10
    ; save argc/argv
    stp x0, x1,[sp]
    ; create autorelease pool and save into x19
    bl _objc_autoreleasePoolPush
    mov x19, x0
    ; initialize app delegate class
    bl initAppDelegate
    ; create CFString with delegate class name
    mov x0,0
    adrp x1, str_AppDelegate@PAGE
    add x1, x1, str_AppDelegate@PAGEOFF
    mov x2,0x0600 ; kCFStringEncodingASCII
    bl _CFStringCreateWithCString
    ; x0 = UIApplicationMain(argc, argv, nil, CFSTR("AppDelegate"));
    mov x3, x0
    ldr x0,[sp]
    ldr x1,[sp, #0x8]
    mov x2, #0
    bl _UIApplicationMain
    mov x7, x0 ; save retval
    ; pop autorelease pool
    mov x0, x19
    bl _objc_autoreleasePoolPop
    ; epilog
    ; restore stack pointer
    addsp,sp,0x10
    ; restore saved registers
    ldr x19,[sp, #0x10]
    ldp x29, x30,[sp], #0x20
    ; get retval
    mov x0, x7
    ret
    initAppDelegate:
    ; prolog; save fp,lr,x20
    stp x29, x30,[sp, #-0x20]!
    str x20,[sp, #0x10]
    mov x29,sp
    ; Class c = objc_allocateClassPair(objc_getClass("NSObject"), "AppDelegate", 0);
    adrp x0, str_NSObject@PAGE
    add x0, x0, str_NSObject@PAGEOFF
    bl _objc_getClass
    adrp x1, str_AppDelegate@PAGE
    add x1, x1, str_AppDelegate@PAGEOFF
    mov x2,0
    bl _objc_allocateClassPair
    ; save the class since we'll clobber x0 several times
    mov x20, x0
    ; class_addProtocol(c, objc_getProtocol("UIApplicationDelegate"));
    adrp x0, str_UIAppDelegate@PAGE
    add x0, x0, str_UIAppDelegate@PAGEOFF
    bl _objc_getProtocol
    mov x1, x0
    mov x0, x20
    bl _class_addProtocol
    ; class_addMethod(c, S("application:didFinishLaunchingWithOptions:"), didFinishLaunching, "B@:@@");
    adrp x0, str_didFinishLaunchingSel@PAGE
    add x0, x0, str_didFinishLaunchingSel@PAGEOFF
    bl _sel_getUid
    mov x1, x0
    mov x0, x20
    adr x2, didFinishLaunching
    adrp x3, str_typestr@PAGE
    add x3, x3, str_typestr@PAGEOFF
    bl _class_addMethod
    ; objc_registerClassPair(c);
    mov x0, x20
    bl _objc_registerClassPair
    ; epilog
    ldr x20,[sp, #0x10]
    ldp x29, x30,[sp], #0x20
    ret
    ; parameters:
    ; x0: self
    ; x1: _sel
    ; x2: application
    ; x3: launchOptions
    didFinishLaunching:
    ; prolog, save fp, lr, x19-x22
    stp x29, x30,[sp, #-0x30]!
    stp x19, x20,[sp, #0x10]
    stp x21, x22,[sp, #0x20]
    mov x29,sp
    subsp,sp,0x20
    ; x19 = @selector(mainScreen)
    adrp x0, str_mainScreen@PAGE
    add x0, x0, str_mainScreen@PAGEOFF
    bl _sel_getUid
    mov x19, x0
    ; objc_getClass("UIScreen")
    adrp x0, str_UIScreen@PAGE
    add x0, x0, str_UIScreen@PAGEOFF
    bl _objc_getClass
    ; x20 = [UIScreen mainScreen]
    mov x1, x19
    bl _objc_msgSend
    mov x20, x0
    ; x19 is now free
    ; x1 = @selector(bounds)
    adrp x0, str_bounds@PAGE
    add x0, x0, str_bounds@PAGEOFF
    bl _sel_getUid
    mov x1, x0
    ; [x20 bounds]
    mov x0, x20
    bl _objc_msgSend
    stp d0, d1,[sp]
    stp d2, d3,[sp, #0x10]
    ; x19 = @selector(initWithFrame:)
    adrp x0, str_initWithFrame@PAGE
    add x0, x0, str_initWithFrame@PAGEOFF
    bl _sel_getUid
    mov x19, x0
    ; x0 = UIWindow
    adrp x0, str_UIWindow@PAGE
    add x0, x0, str_UIWindow@PAGEOFF
    bl _objc_getClass
    ; x0 = class_createInstance(x0)
    mov x1, #0x0
    bl _class_createInstance
    ; x0 now has the instance
    ; x20 = [x0 initWithFrame:d]
    mov x1, x19 ;initWithFrame
    ldp d0, d1,[sp]
    ldp d2, d3,[sp, #0x10]
    bl _objc_msgSend
    mov x20, x0
    ; x19 = @selector(init)
    adrp x0, str_init@PAGE
    add x0, x0, str_init@PAGEOFF
    bl _sel_getUid
    mov x19, x0
    ; x0 = UIViewController
    adrp x0, str_UIViewController@PAGE
    add x0, x0, str_UIViewController@PAGEOFF
    bl _objc_getClass
    ; x0 = class_createInstance(UIViewController)
    mov x1, #0x0
    bl _class_createInstance
    ; x0 now has the instance
    ; x21 = [x0 init]
    mov x1, x19 ;init
    bl _objc_msgSend
    mov x21, x0
    ; x19 = @selector(yellowColor)
    adrp x0, str_yellowColor@PAGE
    add x0, x0, str_yellowColor@PAGEOFF
    bl _sel_getUid
    mov x19, x0
    ; x22 = [UIColor yellowColor]
    adrp x0, str_UIColor@PAGE
    add x0, x0, str_UIColor@PAGEOFF
    bl _objc_getClass
    mov x1, x19
    bl _objc_msgSend
    mov x22, x0
    ; x19 = @selector(setBackgroundColor:)
    adrp x0, str_setBackgroundColor@PAGE
    add x0, x0, str_setBackgroundColor@PAGEOFF
    bl _sel_getUid
    mov x19, x0
    ; x1 = @selector(view)
    adrp x0, str_view@PAGE
    add x0, x0, str_view@PAGEOFF
    bl _sel_getUid
    mov x1, x0
    ; x0 = [[controller view] setBackgroundColor: x22];
    mov x0, x21
    bl _objc_msgSend
    mov x1, x19
    mov x2, x22
    bl _objc_msgSend
    adrp x0, str_setRoot@PAGE
    add x0, x0, str_setRoot@PAGEOFF
    bl _sel_getUid
    mov x1, x0
    ; [window setRootViewController:viewController]
    mov x0, x20
    mov x2, x21
    bl _objc_msgSend
    ; [x20 makeKeyAndVisible]
    adrp x0, str_makeKeyAndVisible@PAGE
    add x0, x0, str_makeKeyAndVisible@PAGEOFF
    bl _sel_getUid
    mov x1, x0
    mov x0, x20
    bl _objc_msgSend
    ; return YES
    mov x0, #0x1
    ; epilog
    addsp,sp,0x20
    ldp x19, x20,[sp, #0x10]
    ldp x21, x22,[sp, #0x20]
    ldp x29, x30,[sp], #0x30
    ret
    .data
    str_NSObject: .asciz"NSObject"
    str_AppDelegate: .asciz"AppDelegate"
    str_UIAppDelegate: .asciz"UIApplicationDelegate"
    str_UIScreen: .asciz"UIScreen"
    str_UIWindow: .asciz"UIWindow"
    str_UIViewController: .asciz"UIViewController"
    str_UIColor: .asciz"UIColor"
    str_typestr: .asciz"B@:@@"
    str_didFinishLaunchingSel: .asciz"application:didFinishLaunchingWithOptions:"
    str_mainScreen: .asciz"mainScreen"
    str_bounds: .asciz"bounds"
    str_initWithFrame: .asciz"initWithFrame:"
    str_makeKeyAndVisible: .asciz"makeKeyAndVisible"
    str_init: .asciz"init"
    str_view: .asciz"view"
    str_setBackgroundColor: .asciz"setBackgroundColor:"
    str_yellowColor: .asciz"yellowColor"
    str_setRoot: .asciz"setRootViewController:"
    @mraniki
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    Could you provide build/deploy steps?

    @Nukoooo
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    ; make space for 2 dword local vars

    not an ARM guy, but shouldn't it be 4 dwords or 2 qwords?

    @hirschsn
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    hirschsn commentedOct 30, 2025•
    edited
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    not an ARM guy, but shouldn't it be 4 dwords or 2 qwords?

    On ARM (32-bit and 64-bit) platforms, "word" commonly refers to as a 32-bit value

    @Nukoooo
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    good to know, thought it was the same as x86

    @pguyot
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    Line 37, do you have a guarantee that _objc_autoreleasePoolPop preserves x7?

    You could also pop x0 and x1 at once on line 33.

    @ozanyasindogan
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    Lol, don't forget to deploy it to appstore and make it paid :D

    @delneg
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    delneg commentedOct 31, 2025•
    edited
    Loading

    build & run:

    bashSDK_PATH=$(xcrun --sdk iphonesimulator --show-sdk-path)# Compile assemblyxcrun -sdk iphonesimulator as -o build/main.o src/main.sxcrun -sdk iphonesimulator ld \  -e _main \  -o build/assembly-app \  -L"$SDK_PATH/usr/lib" \  -F"$SDK_PATH/System/Library/Frameworks" \  -lSystem \  -lobjc \  -framework UIKit \  -framework Foundation \  -framework CoreFoundation \  build/main.omkdir -p build/assembly-app.appcp build/assembly-app build/assembly-app.app/AssemblyAppcp Info.plist build/assembly-app.app/xcrun simctl install booted build/assembly-app.appxcrun simctl launch booted com.example.AssemblyApp

    plist:

    <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"><plist version="1.0"><dict>    <key>CFBundleExecutable</key>    <string>AssemblyApp</string>    <key>CFBundleIdentifier</key>    <string>com.example.AssemblyApp</string>    <key>CFBundleInfoDictionaryVersion</key>    <string>6.0</string>    <key>CFBundleName</key>    <string>AssemblyApp</string>    <key>CFBundlePackageType</key>    <string>APPL</string>    <key>CFBundleShortVersionString</key>    <string>1.0</string>    <key>CFBundleVersion</key>    <string>1</string></dict></plist>

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