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Simplified Interceptor reimplemented in TypeScript
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const THUMB_HOOK_REDIRECT_SIZE = 8; | |
const THUMB_BIT_REMOVAL_MASK = ptr(1).not(); | |
const trampolines: NativePointer[] = []; | |
const replacements: NativePointer[] = []; | |
export function makeTrampoline(target: NativePointer): NativePointer { | |
const targetAddress = target.and(THUMB_BIT_REMOVAL_MASK); | |
const trampoline = Memory.alloc(Process.pageSize); | |
Memory.patchCode(trampoline, 128, code => { | |
const writer = new ThumbWriter(code, { pc: trampoline }); | |
const relocator = new ThumbRelocator(targetAddress, writer); | |
let n: number; | |
do { | |
n = relocator.readOne(); | |
} while (n < THUMB_HOOK_REDIRECT_SIZE); | |
relocator.writeAll(); | |
if (!relocator.eoi) { | |
writer.putLdrRegAddress(ArmRegister.Pc, target.add(n)); | |
} | |
writer.flush(); | |
}); | |
trampolines.push(trampoline); | |
return trampoline.or(1); | |
} | |
export function replace(target: NativePointer, replacement: NativePointer): void { | |
const targetAddress = target.and(THUMB_BIT_REMOVAL_MASK); | |
Memory.patchCode(targetAddress, 128, code => { | |
const writer = new ThumbWriter(code, { pc: targetAddress }); | |
writer.putLdrRegAddress(ArmRegister.Pc, replacement); | |
writer.flush(); | |
}); | |
replacements.push(replacement); | |
} |
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