angel_SWI_ARM
Christopher Covington
cov at codeaurora.org
Wed Aug 7 09:48:16 EDT 2013
On 08/07/2013 06:57 AM, zhaobin xv wrote:
> Hello
> when I read linux/arch/arm/boot/compressed/head.S
> I can't understand :
> mrs r2, cpsr @ get current mode
> tst r2, #3 @ not user?
> bne not_angel
> mov r0, #0x17 @ angel_SWIreason_EnterSVC
> swi 0x123456 @ angel_SWI_ARM
> I want to know :
> a) what is angel_SWI_ARM
> b) what is angel debuger
> c)Do the code " swi 0x123456 " make interrupt what make program
> jump to addr 0x0000 0008
> ,but addr 0x0000 0008 doesn't initialize.
Angel is ARM's semihosting interface.
http://infocenter.arm.com/help/topic/com.arm.doc.dui0471c/CHDJHHDI.html
HTH,
Christopher
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