1/* Startup code for M68HC11.
2   Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc.
3
4This file is free software; you can redistribute it and/or modify it
5under the terms of the GNU General Public License as published by the
6Free Software Foundation; either version 2, or (at your option) any
7later version.
8
9In addition to the permissions in the GNU General Public License, the
10Free Software Foundation gives you unlimited permission to link the
11compiled version of this file with other programs, and to distribute
12those programs without any restriction coming from the use of this
13file.  (The General Public License restrictions do apply in other
14respects; for example, they cover modification of the file, and
15distribution when not linked into another program.)
16
17This file is distributed in the hope that it will be useful, but
18WITHOUT ANY WARRANTY; without even the implied warranty of
19MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20General Public License for more details.
21
22You should have received a copy of the GNU General Public License
23along with this program; see the file COPYING.  If not, write to
24the Free Software Foundation, 59 Temple Place - Suite 330,
25Boston, MA 02111-1307, USA.  */
26
27/* As a special exception, if you link this library with other files,
28   some of which are compiled with GCC, to produce an executable,
29   this library does not by itself cause the resulting executable
30   to be covered by the GNU General Public License.
31   This exception does not however invalidate any other reasons why
32   the executable file might be covered by the GNU General Public License.  */
33
34;-----------------------------------------
35; startup code
36;-----------------------------------------
37	.file	"crt0.s"
38
39#ifdef __HAVE_SHORT_INT__
40	.mode mshort
41#else
42	.mode mlong
43#endif
44
45#if defined(__USE_RTC__) && defined(mc68hc12)
46	.macro jsr name
47	call	\name
48	.endm
49#endif
50;;
51;;
52;; The linker concatenate the .install* sections in the following order:
53;;
54;; .install0	Setup the stack pointer
55;; .install1	Place holder for applications
56;; .install2	Optional installation of data section in memory
57;; .install3	Place holder for applications
58;; .install4	Invokes the main
59;;
60	.sect   .install0,"ax",@progbits
61	.globl _start
62
63_start:
64;;
65;; At this step, the stack is not initialized and interrupts are masked.
66;; Applications only have 64 cycles to initialize some registers.
67;;
68;; To have a generic/configurable startup, initialize the stack to
69;; the end of some memory region.  The _stack symbol is defined by
70;; the linker.
71;;
72	lds	#_stack
73
74	.sect	.install2,"ax",@progbits
75;;
76;; Call a specific initialization operation.  The default is empty.
77;; It can be overridden by applications.  It is intended to initialize
78;; the 68hc11 registers.  Function prototype is:
79;;
80;;	int __premain(void);
81;;
82	jsr	__premain
83
84;;
85;;
86;;
87	.sect	.install4,"ax",@progbits
88	jsr     main
89fatal:
90	jsr	exit
91	bra fatal
92
93;-----------------------------------------
94; end startup code
95;-----------------------------------------
96;; Force loading of data section mapping and bss clear
97	.2byte	__map_data_section
98	.2byte  __init_bss_section
99