source: rtems/c/src/lib/libbsp/m68k/gen68360/startup/linkcmds.prom @ 1587af6

4.104.114.84.95
Last change on this file since 1587af6 was 1587af6, checked in by Joel Sherrill <joel.sherrill@…>, on 12/20/97 at 16:37:29

Update from Eric Norum to include C++ support.
  • Property mode set to 100644
File size: 4.4 KB
Line 
1/*
2 * This file contains GNU linker directives for a generic MC68360 board.
3 * Variations in hardware type and dynamic memory size can be made
4 * by overriding some values with linker command-line arguments.
5 *
6 * These linker directives are for producing a BOOTP PROM.
7 * To create the PROM image from the linker output you must use objcopy
8 * (--adjust-section-vma) to place the data segment at the end of the text
9 * segment in the PROM.  The start-up code takes care of copying this region
10 * to RAM.
11 *
12 * Saskatchewan Accelerator Laboratory
13 * University of Saskatchewan
14 * Saskatoon, Saskatchewan, CANADA
15 * eric@skatter.usask.ca
16 *
17 *  $Id$
18 */
19
20/*
21 * a.out format doesn't handle prom images very well
22 */
23OUTPUT_FORMAT(coff-m68k)
24
25/*
26 * Declare some sizes.
27 * XXX: The assignment of ". += XyzSize;" fails in older gld's if the
28 *      number used there is not constant.  If this happens to you, edit
29 *      the lines marked XXX below to use a constant value.
30 */
31RamSize = DEFINED(RamSize) ? RamSize : 4M;
32HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000;
33StackSize = DEFINED(StackSize) ? StackSize : 0x1000;
34
35/*
36 * Declare hardware type
37 */
38MC68360HardwareTypeMotorolaGeneric = 0;
39MC68360HardwareTypeAtlasHSB = 1;
40MC68360HardwareType = DEFINED(MC68360HardwareType) ? MC68360HardwareType : 0;
41
42/*
43 * Declare on-board memory.
44 * It would be nice if the ram length could be given as
45 * LENGTH=RamSize, but gld doesn't allow non-constant
46 * values in the LENGTH expression. 
47 */
48MEMORY {
49          ram : ORIGIN = 0x00000000, LENGTH = 64M
50          rom : ORIGIN = 0xFF000000, LENGTH = 1M
51        dpram : ORIGIN = 0xFE000000, LENGTH = 8k
52}
53
54/*
55 * Declare low-order three octets of Ethernet address.
56 */
57ETHERNET_ADDRESS = DEFINED(ETHERNET_ADDRESS) ? ETHERNET_ADDRESS : 0xDEAD12;
58
59/*
60 * Declare hardware type.
61 * Acceptable values are:
62 *      0 - Generic system as described in the MC68360 User's Manual
63 *          (MC68360UM/AD Rev. 1).
64 *      1 - ATLAS Computer Equipment Incorporated ACE360/HSB.
65 */
66MC68360HardwareType = DEFINED(MC68360HardwareType) ? MC68360HardwareType : 0;
67
68/*
69 * Load objects
70 */
71SECTIONS {
72        /*
73         * Hardware variations
74         */
75        _RamSize = RamSize;
76        __RamSize = RamSize;
77        _MC68360HardwareType = MC68360HardwareType;
78        __MC68360HardwareType = MC68360HardwareType;
79        _MC68360HardwareTypeMotorolaGeneric = MC68360HardwareTypeMotorolaGeneric;
80        __MC68360HardwareTypeMotorolaGeneric = MC68360HardwareTypeMotorolaGeneric;
81        _MC68360HardwareTypeAtlasHSB = MC68360HardwareTypeAtlasHSB;
82        __MC68360HardwareTypeAtlasHSB = MC68360HardwareTypeAtlasHSB;
83
84        /*
85         * Boot PROM
86         */
87        rom : {
88                _RomBase = .;
89                __RomBase = .;
90        } >rom
91
92        /*
93         * Dynamic RAM
94         */
95        ram : {
96                _RamBase = .;
97                __RamBase = .;
98        } >ram
99
100        /*
101         * Text, data and bss segments
102         */
103        .text : {
104                CREATE_OBJECT_SYMBOLS
105                *(.text)
106                . = ALIGN (16);
107                etext = .;
108                _etext = .;
109
110                /*
111                 * C++ constructors
112                 */
113                __CTOR_LIST__ = .;
114                LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)
115                *(.ctors)
116                LONG(0)
117                __CTOR_END__ = .;
118                __DTOR_LIST__ = .;
119                LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)
120                *(.dtors)
121                LONG(0)
122                __DTOR_END__ = .;
123        } >rom
124        .data : {
125                copy_start = .;
126                *(.data)
127                . = ALIGN (16);
128                _edata = .;
129                copy_end = .;
130        } >ram
131        .bss : {
132                M68Kvec = .;
133                _M68Kvec = .;
134                . += (256 * 4);
135                clear_start = .;
136                *(.bss)
137                *(COMMON)
138                . = ALIGN (16);
139                _end = .;
140
141                _HeapStart = .;
142                __HeapStart = .;
143                . += HeapSize;  /* XXX -- Old gld can't handle this */
144                . += StackSize; /* XXX -- Old gld can't handle this */
145                /* . += 0x10000; */ /* HeapSize for old gld */
146                /* . += 0x1000;  */ /* StackSize for old gld */
147                . = ALIGN (16);
148                stack_init = .;
149                clear_end = .;
150
151                _WorkspaceBase = .;
152                __WorkspaceBase = .;
153        } >ram
154
155        /*
156         * On-chip memory/peripherals
157         */
158        dpram : {
159                m360 = .;
160                _m360 = .;
161                . += (8 * 1024);
162
163        } >dpram
164}
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