?? crt0.s
字號:
@ r0 -> start of flash
@ r1 -> where to load data
@ r2 -> start of program
.text
.align
.global main,_main
main:
_main:
# copy .data section
ldr r3, =_etext
ldr r4, =_sdata
ldr r5, =_edata
subs r5, r5, r4
bl copydata
# clear .bss section
ldr r4, =_sbss
ldr r5, =_ebss
subs r5, r5, r4
mov r0, #0
bl clearbss
# and jump to the kernel
b boot
copydata:
subs r5, r5, #4
ldr r6, [r3], #4
str r6, [r4], #4
bne copydata
mov pc, lr
clearbss:
subs r5, r5, #4
str r0, [r3], #4
bne clearbss
mov pc, lr
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