?? asmstartup.s
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/* *---------------------------------------------------------------------- * T-Kernel * * Copyright (C) 2004-2006 by Ken Sakamura. All rights reserved. * T-Kernel is distributed under the T-License. *---------------------------------------------------------------------- * * Version: 1.02.02 * Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/9. * *---------------------------------------------------------------------- *//* * @(#)asmstartup.S (crttk) * * Driver/manager startup */#include <machine.h>#include <tk/asm.h> .text .balign 4 .globl Csym(_C_startup) .type Csym(_C_startup), @functionCsym(_C_startup): cmp/pz r4 bf l_noinit // Initialize is performed only when ac >= 0 mov.l DATA_ORG, r1 // When data area does not need to be moved, mov.l DATA_START, r2 // OS loads cmp/eq r1, r2 bt l_noinit mov.l DATA_END, r3 bra l1 // initialize data area nop copydata: mov.l @r1+, r0 mov.l r0, @r2 add #4, r2 l1: cmp/hi r2, r3 bt copydata mov.l BSS_START, r2 // clear bss area mov.l BSS_END, r3 bra l2 mov #0, r0 clrbss: mov.l r0, @-r3 l2: cmp/hi r2, r3 bt clrbss l_noinit: mov.l L_Startup, r0 jmp @r0 nop .balign 4DATA_ORG: .long Csym(__data_org)DATA_START: .long Csym(__data_start)DATA_END: .long Csym(_edata)BSS_START: .long Csym(__bss_start)BSS_END: .long Csym(_end)L_Startup: .long Csym(_P_startup)?? 快捷鍵說(shuō)明
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