Differences

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--- arm [2018/01/30 08:15] – created niziak
+++ arm [2022/07/06 19:51] (current) – niziak
@@ Line 1: / Line 1: @@
+====== ARM ======
 ====== Registers ======
   * **r10** sl Stack limit
   * **r11** fp Argument pointer
-  * **r12** ip Temporary workspace
+  * **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.
-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).