ARMv7 exception helper

.gdbinit

define armex
	if $lr & 0xd == 0xd
		printf "Uses PSP 0x%x return.\n", $PSP
		set $armex_base = $PSP
	else
		printf "Uses MSP 0x%x return.\n", $MSP
		set $armex_base = $MSP
	end

	printf "xPSR            0x%x\n", *($armex_base+28)
	printf "ReturnAddress   0x%x\n", *($armex_base+24)
	printf "LR (R14)        0x%x\n", *($armex_base+20)
	printf "R12             0x%x\n", *($armex_base+16)
	printf "R3              0x%x\n", *($armex_base+12)
	printf "R2              0x%x\n", *($armex_base+8)
	printf "R1              0x%x\n", *($armex_base+4)
	printf "R0              0x%x\n", *($armex_base)
	printf "Return instruction:\n"
	x/i *($armex_base+24)
end

document armex
ARMv7 Exception entry behavior.
xPSR, ReturnAddress, LR (R14), R12, R3, R2, R1, and R0
end

(gdb) armex