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