in AM335X_StarterWare_02_00_00_06\examples\evmAM335x\isr_reloc\exceptionhandler_ewarm.S
the IRQHandler does not appear to save the SPSR register, however the TRM (spurh73f section 6.2.2) suggest it should be saved
;******************************************************************************
;* Function Definition of IRQ Handler
;******************************************************************************
;
; The IRQ handler jumps to the ISR of highest priority pending IRQ.
; This handler doesnot support nesting.
;
IRQHandler:
STMFD r13!, {r0-r3, r12, r14} ; Save context in IRQ stack
;; ===================================== shouldnt the spsr be preserved here
LDR r0, =ADDR_SIR_IRQ ; Get the Active IRQ
LDR r1, [r0]
AND r1, r1, #MASK_ACTIVE_IRQ ; Mask the Active IRQ number
LDR r0, =fnRAMVectors ; Load the base of the vector table
ADD r14, pc, #0 ; Save return address in LR
LDR pc, [r0, r1, lsl #2] ; Jump to the ISR
MOV r0, #NEWIRQAGR ; Acknowledge the current IRQ
LDR r1, =ADDR_CONTROL
STR r0, [r1]
DMB ; Barrier to complete the data write
LDMFD r13!, {r0-r3, r12, r14} ; Restore registers from IRQ stack
SUBS pc, r14, #0x4 ; Return to program before IRQ
