131 lines
4.3 KiB
Java
131 lines
4.3 KiB
Java
/* Unicorn Emulator Engine */
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/* By Nguyen Anh Quynh, 2015 */
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/* Sample code to demonstrate how to emulate ARM code */
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import unicorn.*;
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public class Sample_arm {
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// code to be emulated
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public static final byte[] ARM_CODE = {55,0,(byte)0xa0,(byte)0xe3,3,16,66,(byte)0xe0}; // mov r0, #0x37; sub r1, r2, r3
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public static final byte[] THUMB_CODE = {(byte)0x83, (byte)0xb0}; // sub sp, #0xc
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// memory address where emulation starts
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public static final int ADDRESS = 0x10000;
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public static final long toInt(byte val[]) {
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long res = 0;
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for (int i = 0; i < val.length; i++) {
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long v = val[i] & 0xff;
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res = res + (v << (i * 8));
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}
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return res;
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}
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private static class MyBlockHook implements BlockHook {
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public void hook(Unicorn u, long address, int size, Object user_data)
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{
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System.out.print(String.format(">>> Tracing basic block at 0x%x, block size = 0x%x\n", address, size));
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}
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}
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// callback for tracing instruction
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private static class MyCodeHook implements CodeHook {
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public void hook(Unicorn u, long address, int size, Object user_data) {
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System.out.print(String.format(">>> Tracing instruction at 0x%x, instruction size = 0x%x\n", address, size));
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}
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}
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static void test_arm()
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{
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byte[] r0 = {0x34, 0x12, 0, 0}; // R0 register
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byte[] r2 = {(byte)0x89, 0x67, 0, 0}; // R1 register
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byte[] r3 = {0x33, 0x33, 0, 0}; // R2 register
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byte[] r1; // R1 register
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System.out.print("Emulate ARM code\n");
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// Initialize emulator in ARM mode
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Unicorn u = new Unicorn(Unicorn.UC_ARCH_ARM, Unicorn.UC_MODE_ARM);
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// map 2MB memory for this emulation
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u.mem_map(ADDRESS, 2 * 1024 * 1024, Unicorn.UC_PROT_READ | Unicorn.UC_PROT_WRITE);
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// write machine code to be emulated to memory
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u.mem_write(ADDRESS, ARM_CODE);
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// initialize machine registers
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u.reg_write(Unicorn.UC_ARM_REG_R0, r0);
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u.reg_write(Unicorn.UC_ARM_REG_R2, r2);
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u.reg_write(Unicorn.UC_ARM_REG_R3, r3);
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// tracing all basic blocks with customized callback
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u.hook_add(new MyBlockHook(), 1, 0, null);
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// tracing one instruction at ADDRESS with customized callback
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u.hook_add(new MyCodeHook(), ADDRESS, ADDRESS, null);
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// emulate machine code in infinite time (last param = 0), or when
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// finishing all the code.
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u.emu_start(ADDRESS, ADDRESS + ARM_CODE.length, 0, 0);
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// now print out some registers
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System.out.print(">>> Emulation done. Below is the CPU context\n");
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r0 = u.reg_read(Unicorn.UC_ARM_REG_R0, 4);
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r1 = u.reg_read(Unicorn.UC_ARM_REG_R1, 4);
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System.out.print(String.format(">>> R0 = 0x%x\n", toInt(r0)));
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System.out.print(String.format(">>> R1 = 0x%x\n", toInt(r1)));
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u.close();
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}
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static void test_thumb()
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{
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byte[] sp = {0x34, 0x12, 0, 0}; // R0 register
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System.out.print("Emulate THUMB code\n");
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// Initialize emulator in ARM mode
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Unicorn u = new Unicorn(Unicorn.UC_ARCH_ARM, Unicorn.UC_MODE_THUMB);
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// map 2MB memory for this emulation
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u.mem_map(ADDRESS, 2 * 1024 * 1024, Unicorn.UC_PROT_READ | Unicorn.UC_PROT_WRITE);
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// write machine code to be emulated to memory
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u.mem_write(ADDRESS, THUMB_CODE);
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// initialize machine registers
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u.reg_write(Unicorn.UC_ARM_REG_SP, sp);
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// tracing all basic blocks with customized callback
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u.hook_add(new MyBlockHook(), 1, 0, null);
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// tracing one instruction at ADDRESS with customized callback
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u.hook_add(new MyCodeHook(), ADDRESS, ADDRESS, null);
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// emulate machine code in infinite time (last param = 0), or when
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// finishing all the code.
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u.emu_start(ADDRESS, ADDRESS + THUMB_CODE.length, 0, 0);
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// now print out some registers
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System.out.print(">>> Emulation done. Below is the CPU context\n");
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sp = u.reg_read(Unicorn.UC_ARM_REG_SP, 4);
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System.out.print(String.format(">>> SP = 0x%x\n", toInt(sp)));
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u.close();
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}
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public static void main(String args[])
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{
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test_arm();
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System.out.print("==========================\n");
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test_thumb();
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}
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}
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