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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).