====== ARM ======

====== Registers ======

  * **r10** sl Stack limit
  * **r11** fp Argument pointer
  * **r12** ip Temporary workspace. Register r12 (IP) may be used by a linker as a scratch register between a routine and any subroutine it calls (for details, see §5.3.1.1, Use of IP by the linker). It can also be used within a routine to hold intermediate values between subroutine calls.
  * **r13** sp Stack pointer
  * **r14** lr Link register Workspace 

====== xPSR ======

Special-purpose program status registers (xPSR)
  * ''APSR'' Application PSR contains the condition code flags. Before entering an exception, the processor saves the condition code flags on the stack
  * ''IPSR'' Interrupt PSR contains the Interrupt Service Routine (ISR) number of the current exception activation.
  * ''EPSR'' Execution PSR contains the Thumb state bit (T-bit).