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