crt0.s

来自「M68K 的 Diab C源码。包括启动程序crt0.s」· S 代码 · 共 27 行

;
;       example/m68k/crt0.s: startup for Bubble Sort example
;
;       *** Simplified version for Bubble Sort example only. ***
;       *** See src/crt68/crt0.s for complete version.       ***
;       --------------------------------------------------------
;
;       Copyright 1997-1998 Diab Data, Inc.

        .file   "crt0.s"
        PSECT
        XDEF    start
        ALIGN   4
        nop                     ; Debuggers may object to starting at 0.

start:
        move.l  #___SP_INIT,a7  ; Initialize stack pointer a7 to value in
                                ; linker command file. (No sdata for a5.)

        move.w  #0x0a00,d1      ; Set "I/O port" value to byte-swapped 10
        move.w  d1,_input_count ; (for bubble sort example only).

        jsr     ___init_main    ; Finishes initialization (copies .data ROM
                                ; to RAM, clears .bss), then calls example
                                ; main(), which calls exit(), which halts.