1 | /* |
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2 | * This file contains GNU linker directives for a generic MC68360 board. |
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3 | * Variations in memory size and allocation can be made by |
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4 | * 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 bootstrap PROM version. |
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7 | * The data segment is placed at the end of the text segment in the PROM. |
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8 | * The start-up code takes care of copying this region to RAM. |
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9 | * |
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10 | * Saskatchewan Accelerator Laboratory |
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11 | * University of Saskatchewan |
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12 | * Saskatoon, Saskatchewan, CANADA |
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13 | * eric@skatter.usask.ca |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | /* |
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19 | * Declare some sizes. |
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20 | * A heap size of 0 means `use all available memory for the heap'. |
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21 | */ |
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22 | _RamBase = DEFINED(_RamBase) ? _RamBase : 0x0; |
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23 | _RamSize = DEFINED(_RamSize) ? _RamSize : 64M; |
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24 | _HeapSize = DEFINED(_HeapSize) ? _HeapSize : 0x0; |
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25 | _StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000; |
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26 | |
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27 | /* |
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28 | * Declare on-board memory. |
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29 | */ |
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30 | MEMORY { |
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31 | ram : ORIGIN = 0x00000000, LENGTH = 64M |
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32 | myram : ORIGIN = 16M-400k, LENGTH = 400k |
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33 | rom : ORIGIN = 0x0F000000, LENGTH = 1M |
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34 | dpram : ORIGIN = 0x0E000000, LENGTH = 8k |
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35 | } |
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36 | |
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37 | /* |
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38 | * Load objects |
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39 | */ |
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40 | SECTIONS { |
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41 | /* |
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42 | * Boot PROM |
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43 | */ |
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44 | rom : { |
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45 | _RomBase = .; |
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46 | } >rom |
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47 | |
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48 | /* |
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49 | * Dynamic RAM |
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50 | */ |
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51 | ram : { |
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52 | _RamBase = .; |
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53 | } >ram |
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54 | |
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55 | /* |
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56 | * Text, data and bss segments |
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57 | */ |
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58 | .text : AT(0x0) { |
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59 | *(.text) |
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60 | |
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61 | /* |
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62 | * C++ constructors/destructors |
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63 | */ |
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64 | *(.gnu.linkonce.t.*) |
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65 | |
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66 | /* |
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67 | * Initialization and finalization code. |
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68 | */ |
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69 | PROVIDE (_init = .); |
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70 | *crti.o(.init) |
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71 | *(.init) |
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72 | *crtn.o(.init) |
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73 | PROVIDE (_fini = .); |
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74 | *crti.o(.fini) |
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75 | *(.fini) |
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76 | *crtn.o(.fini) |
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77 | |
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78 | /* |
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79 | * C++ constructors/destructors |
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80 | */ |
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81 | . = ALIGN (16); |
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82 | *crtbegin.o(.ctors) |
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83 | *(.ctors) |
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84 | *crtend.o(.ctors) |
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85 | *crtbegin.o(.dtors) |
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86 | *(.dtors) |
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87 | *crtend.o(.dtors) |
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88 | |
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89 | /* |
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90 | * Exception frame info |
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91 | */ |
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92 | . = ALIGN (16); |
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93 | *(.eh_frame) |
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94 | |
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95 | /* |
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96 | * Read-only data |
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97 | */ |
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98 | . = ALIGN (16); |
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99 | _rodata_start = . ; |
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100 | *(.rodata) |
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101 | *(.gnu.linkonce.r*) |
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102 | |
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103 | . = ALIGN (16); |
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104 | PROVIDE (etext = .); |
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105 | } >rom |
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106 | .data : AT(SIZEOF(.text)) { |
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107 | _copy_start = .; |
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108 | *(.data) |
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109 | *(.gnu.linkonce.d*) |
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110 | *(.gcc_except_table) |
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111 | . = ALIGN (16); |
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112 | PROVIDE (edata = .); |
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113 | _copy_end = .; |
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114 | } >myram |
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115 | .bss : { |
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116 | M68Kvec = .; |
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117 | . += (256 * 4); |
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118 | _clear_start = .; |
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119 | *(.bss) |
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120 | *(COMMON) |
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121 | . = ALIGN (16); |
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122 | PROVIDE (end = .); |
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123 | |
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124 | . += _StackSize; |
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125 | . = ALIGN (16); |
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126 | _stack_init = .; |
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127 | _clear_end = .; |
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128 | |
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129 | _WorkspaceBase = .; |
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130 | } >myram |
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131 | |
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132 | /* |
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133 | * On-chip memory/peripherals |
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134 | */ |
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135 | dpram : { |
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136 | m360 = .; |
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137 | . += (8 * 1024); |
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138 | } >dpram |
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139 | } |
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