source: trunk/libs/newlib/src/libgloss/m68hc11/crt0.S @ 610

Last change on this file since 610 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.0 KB
RevLine 
[444]1/* Startup code for M68HC11/M68HC12.
2 * Copyright (C) 1999, 2000, 2001, 2002 Stephane Carrez (stcarrez@nerim.fr)     
3 *
4 * The authors hereby grant permission to use, copy, modify, distribute,
5 * and license this software and its documentation for any purpose, provided
6 * that existing copyright notices are retained in all copies and that this
7 * notice is included verbatim in any distributions. No written agreement,
8 * license, or royalty fee is required for any of the authorized uses.
9 * Modifications to this software may be copyrighted by their authors
10 * and need not follow the licensing terms described here, provided that
11 * the new terms are clearly indicated on the first page of each file where
12 * they apply.
13 */
14
15;-----------------------------------------
16; startup code
17;-----------------------------------------
18        .file   "crt0.s"
19
20;;
21;;
22;; The linker concatenate the .install* sections in the following order:
23;;
24;; .install0    Setup the stack pointer
25;; .install1    Place holder for applications
26;; .install2    Optional installation of data section in memory
27;; .install3    Place holder for applications
28;; .install4    Invokes the main
29;;
30        .sect   .install0,"ax",@progbits
31        .globl _start
32
33_start:
34;;
35;; At this step, the stack is not initialized and interrupts are masked.
36;; Applications only have 64 cycles to initialize some registers.
37;;
38;; To have a generic/configurable startup, initialize the stack to
39;; the end of some memory region.  The _stack symbol is defined by
40;; the linker.
41;;
42        lds     #_stack
43       
44        .sect   .install2,"ax",@progbits
45;;
46;; Call a specific initialization operation.  The default is empty.
47;; It can be overriden by applications.  It is intended to initialize
48;; the 68hc11 registers.  Function prototype is:
49;;
50;;      int __premain(void);
51;;
52        jsr     __premain
53       
54;;
55;;
56;;
57        .sect   .install4,"ax",@progbits
58        jsr     main
59fatal:
60        jsr     exit
61        bra fatal
62
63;-----------------------------------------
64; end startup code
65;-----------------------------------------
66;; Force loading of data section mapping and bss clear
67        .globl  __map_data_section
68        .globl  __init_bss_section
69
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