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jeremybenn |
/* Startup code for M68HC11.
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Copyright (C) 1999, 2000, 2002, 2008, 2009 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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. */
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;-----------------------------------------
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; startup code
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;-----------------------------------------
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#ifdef __HAVE_SHORT_INT__
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.mode mshort
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#else
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.mode mlong
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#endif
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#if defined(__USE_RTC__) && defined(mc68hc12)
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.macro jsr name
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call \name
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.endm
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#endif
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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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;;
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;; .install0 Setup the stack pointer
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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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;; .install3 Place holder for applications
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;; .install4 Invokes the main
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;;
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.sect .install0,"ax",@progbits
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.globl _start
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_start:
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;;
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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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;;
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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 linker.
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;;
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lds #_stack
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.sect .install2,"ax",@progbits
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;;
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;; Call a specific initialization operation. The default is empty.
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;; It can be overridden by applications. It is intended to initialize
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;; the 68hc11 registers. Function prototype is:
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;;
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;; int __premain(void);
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;;
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jsr __premain
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;;
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;;
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;;
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.sect .install4,"ax",@progbits
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jsr main
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fatal:
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jsr exit
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bra fatal
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;-----------------------------------------
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; end startup code
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;-----------------------------------------
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;; Force loading of data section mapping and bss clear
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.2byte __map_data_section
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.2byte __init_bss_section
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