startup.s

来自「mx21 Nor flash Bootloader 源代码」· S 代码 · 共 41 行

	.extern	main
	.global	_start
	.extern	__end_data

	b		_start		// this line is mainly for debugging with bootstrap mode
							// so that the first line of b-record is executed correctly
	.equ		ImageSize,		__end_data - 0xC0800200
	.long		ImageSize

_start:
	ldr	r1,=StackInit
	ldr	sp,[r1]
	b		main

	.equ		StackInitValue,	__end_data+0x1000		// 4K

StackInit:
	.long		StackInitValue

 	.global	JumpToKernel
//	r0 = jump address
//	r1 = pointer to command line
JumpToKernel:
//	jump to the copy code (get the arguments right)
	mov	pc, r0

 	.global	JumpToKernel0x
//	r0 = jump address
//	r1-r4 = arguments to use (these get shifted)
JumpToKernel0x:
//	jump to the copy code (get the arguments right)
	mov	r8, r0
	mov	r0, r1
	mov	r1, r2
	mov	r2, r3
	mov	r3, r4
	mov	pc, r8
.section ".data.boot"
.section ".bss.boot"