ARM Cortex R4F - Manual (Page 339)

Debug
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 11-70
ID013010 Non-Confidential, Unrestricted Access
// Step 1. Save R0.
saved_r0 := ReadRegister(0);
// Step 2. Execute instruction MCR p15, 0, R0, c0, c1, 0 through the ITR.
ExecuteARMInstruction(0xEE000010 + (CPnum<<8) + (opc1<<21) + (CRn<<16) + CRm
+ (opc2<<5));
// Step 3. Read the value of R0 that now contains the CP register.
CP15c1 := ReadRegister(0);
// Step 4. Restore the value of R0.
WriteRegister(0, saved_r0);
return CP15c1;
}