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/* Startup code for M68HC11.
Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
In addition to the permissions in the GNU General Public License, the
Free Software Foundation gives you unlimited permission to link the
compiled version of this file with other programs, and to distribute
those programs without any restriction coming from the use of this
file. (The General Public License restrictions do apply in other
respects; for example, they cover modification of the file, and
distribution when not linked into another program.)
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* As a special exception, if you link this library with other files,
some of which are compiled with GCC, to produce an executable,
this library does not by itself cause the resulting executable
to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
;-----------------------------------------
; startup code
;-----------------------------------------
.file "crt0.s"
#ifdef __HAVE_SHORT_INT__
.mode mshort
#else
.mode mlong
#endif
#if defined(__USE_RTC__) && defined(mc68hc12)
.macro jsr name
call \name
.endm
#endif
;;
;;
;; 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 overridden 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
.2byte __map_data_section
.2byte __init_bss_section
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