constexpr uchar I_REX_B_41 = 0x41;
constexpr uchar I_REX_W_48 = 0x48;
constexpr uchar I_REX_WXB_4b = 0x4b;
constexpr uchar I_REX_WRXB_4f = 0x4f;

// INTEL: Opcodes
constexpr uchar I_PUSH_BP_55 = 0x55;
constexpr uchar I_LEA_8d = 0x8d;
constexpr uchar I_MOV_r8_rm8_8a = 0x8a;
constexpr uchar I_MOV_r64_r64_8b = 0x8b;

constexpr uchar I_LEA_bf = 0xbf;
constexpr uchar I_JMP_e9 = 0xe9;
constexpr uchar I_CALL_e8 = 0xe8;
constexpr uchar I_XOR_30 = 0x30;

// Intel: Mod/RM
constexpr uchar I_RM_BITS_07 = 0x07;
constexpr uchar I_MOD_BITS_c0 = 128 + 64;
constexpr uchar I_MOD_SDWORD_RAX_SDWORD_AL_80 = 0x80;
constexpr uchar I_MOD_SDWORD_RDI_SDWORD_BH_bf = 0xBF;
constexpr uchar I_BP_MOD_00 = 0x00;
constexpr uchar I_BP_RM_RIP_DISP32_05 = 0x05;

// ARM
constexpr uchar A_LDR_e5 = 0xe5;
constexpr uchar A_PUSH_e9 = 0xe9;

bool identify_cpu_and_pic_mode() {
  uchar *start = (uchar *)identify_cpu_and_pic_mode;
  uchar *p = start;
  uchar c0,c1,c2;
  int i = 0; p = start;
  do {
    c0 = *p; c1 = *(p+1); c2 = *(p+2);
    // 4c 8b 3d aa 38 20 00    mov    r15,QWORD PTR [rip+0x2038aa] 
    if ((c0 >= I_REX_W_48 && c0 <= I_REX_WRXB_4f) &&
        (c1 == I_LEA_8d || c1 == I_MOV_r64_r64_8b) &&
        ((c2 & I_RM_BITS_07) == I_BP_RM_RIP_DISP32_05)) {
      intel = true; pic_mode = true; return true;
    }
    p++;
  } while (++i < 20);
  i = 0; p = start;
  do {
    c0 = *p; c1 = *(p+1); c2 = *(p+2);
    // 8a 88 9f 1a 40 00       mov    cl,BYTE PTR [rax+0x401a9f] 
    // 8a 05 f9 ff ff ff       mov    al,BYTE PTR [rip-5]
    if (c0 == I_MOV_r8_rm8_8a && 
        (c1 >= I_MOD_SDWORD_RAX_SDWORD_AL_80 && 
        c1 <= I_MOD_SDWORD_RDI_SDWORD_BH_bf)) {
      intel = true; pic_mode = false; return true;
    }
    p++;
  } while (++i < 20);
  uchar c3; int ldr_count = 0;
  i = 0; p = start;
  do {
    c0 = *p; c1 = *(p+1); c2 = *(p+2); c3 = *(p + 3); 
    // e59f0028        ldr     r0, [pc, #40]
    if (c3 == A_LDR_e5) { ldr_count++; }
    p += 4;
    i += 4;
  } while (i < 100);
  if (ldr_count >= 4) { arm = true; pic_mode = true; return true; } 
  if (ldr_count > 1) { arm = true; return true; } 

  cout << "Unknown CPU id: "; dump(start, 20);
  return false;
}