| /* Startup code for M68HC11/M68HC12. |
| * Copyright (C) 1999, 2000, 2001, 2002 Stephane Carrez (stcarrez@nerim.fr) |
| * |
| * The authors hereby grant permission to use, copy, modify, distribute, |
| * and license this software and its documentation for any purpose, provided |
| * that existing copyright notices are retained in all copies and that this |
| * notice is included verbatim in any distributions. No written agreement, |
| * license, or royalty fee is required for any of the authorized uses. |
| * Modifications to this software may be copyrighted by their authors |
| * and need not follow the licensing terms described here, provided that |
| * the new terms are clearly indicated on the first page of each file where |
| * they apply. |
| */ |
| |
| ;----------------------------------------- |
| ; startup code |
| ;----------------------------------------- |
| .file "crt0.s" |
| |
| ;; |
| ;; |
| ;; The linker concatenate the .install* sections in the following order: |
| ;; |
| ;; .install0 Setup the stack pointer |
| ;; .install1 Place holder for applications |
| ;; .install2 Optional installation of data section in memory |
| ;; .install3 Place holder for applications |
| ;; .install4 Invokes the main |
| ;; |
| .sect .install0,"ax",@progbits |
| .globl _start |
| |
| _start: |
| ;; |
| ;; At this step, the stack is not initialized and interrupts are masked. |
| ;; Applications only have 64 cycles to initialize some registers. |
| ;; |
| ;; To have a generic/configurable startup, initialize the stack to |
| ;; the end of some memory region. The _stack symbol is defined by |
| ;; the linker. |
| ;; |
| lds #_stack |
| |
| .sect .install2,"ax",@progbits |
| ;; |
| ;; Call a specific initialization operation. The default is empty. |
| ;; It can be overriden by applications. It is intended to initialize |
| ;; the 68hc11 registers. Function prototype is: |
| ;; |
| ;; int __premain(void); |
| ;; |
| jsr __premain |
| |
| ;; |
| ;; |
| ;; |
| .sect .install4,"ax",@progbits |
| jsr main |
| fatal: |
| jsr exit |
| bra fatal |
| |
| ;----------------------------------------- |
| ; end startup code |
| ;----------------------------------------- |
| ;; Force loading of data section mapping and bss clear |
| .globl __map_data_section |
| .globl __init_bss_section |
| |