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