[c257ec4e] | 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 | * Saskatchewan Accelerator Laboratory |
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| 7 | * University of Saskatchewan |
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| 8 | * Saskatoon, Saskatchewan, CANADA |
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| 9 | * eric@skatter.usask.ca |
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| 10 | * |
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| 11 | * $Id$ |
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| 12 | */ |
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| 13 | |
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| 14 | /* |
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| 15 | * Declare some sizes. |
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| 16 | */ |
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| 17 | HeapSize = DEFINED(HeapSize) ? HeapSize : 0x10000; |
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| 18 | StackSize = DEFINED(StackSize) ? StackSize : 0x1000; |
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| 19 | |
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| 20 | /* |
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| 21 | * Declare on-board memory. |
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| 22 | */ |
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| 23 | MEMORY { |
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| 24 | ram : ORIGIN = 0x00000000, LENGTH = 64M |
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| 25 | rom : ORIGIN = 0x0F000000, LENGTH = 1M |
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| 26 | dpram : ORIGIN = 0x0E000000, LENGTH = 8k |
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| 27 | } |
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| 28 | |
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| 29 | /* |
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| 30 | * Load objects |
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| 31 | */ |
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| 32 | SECTIONS { |
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| 33 | /* |
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| 34 | * Boot PROM |
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| 35 | */ |
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| 36 | rom : { |
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| 37 | _RomBase = .; |
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| 38 | } >rom |
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| 39 | |
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| 40 | /* |
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| 41 | * Dynamic RAM |
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| 42 | */ |
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| 43 | ram : { |
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| 44 | _RamBase = .; |
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| 45 | } >ram |
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| 46 | |
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| 47 | /* |
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| 48 | * Text, data and bss segments |
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| 49 | */ |
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| 50 | .text : { |
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| 51 | *(.text) |
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| 52 | |
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[b2b4835] | 53 | /* |
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| 54 | * C++ constructors/destructors |
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| 55 | */ |
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[01c36de] | 56 | *(.gnu.linkonce.t.*) |
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| 57 | |
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[b2b4835] | 58 | /* |
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| 59 | * Initialization and finalization code. |
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| 60 | * |
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| 61 | * Various files can provide initialization and finalization |
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| 62 | * functions. crtbegin.o and crtend.o are two instances. The |
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| 63 | * body of these functions are in .init and .fini sections. We |
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| 64 | * accumulate the bodies here, and prepend function prologues |
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| 65 | * from crti.o and function epilogues from crtn.o. crti.o must |
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| 66 | * be linked first; crtn.o must be linked last. Because these |
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| 67 | * are wildcards, it doesn't matter if the user does not |
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| 68 | * actually link against crti.o and crtn.o; the linker won't |
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| 69 | * look for a file to match a wildcard. The wildcard also |
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| 70 | * means that it doesn't matter which directory crti.o and |
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| 71 | * crtn.o are in. |
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| 72 | */ |
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| 73 | PROVIDE (_init = .); |
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| 74 | *crti.o(.init) |
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| 75 | *(.init) |
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| 76 | *crtn.o(.init) |
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| 77 | PROVIDE (_fini = .); |
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| 78 | *crti.o(.fini) |
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| 79 | *(.fini) |
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| 80 | *crtn.o(.fini) |
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[f86ec42] | 81 | |
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[c257ec4e] | 82 | /* |
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[b2b4835] | 83 | * C++ constructors/destructors |
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| 84 | * |
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| 85 | * gcc uses crtbegin.o to find the start of the constructors |
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| 86 | * and destructors so we make sure it is first. Because this |
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| 87 | * is a wildcard, it doesn't matter if the user does not |
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| 88 | * actually link against crtbegin.o; the linker won't look for |
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| 89 | * a file to match a wildcard. The wildcard also means that |
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| 90 | * it doesn't matter which directory crtbegin.o is in. The |
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| 91 | * constructor and destructor list are terminated in |
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| 92 | * crtend.o. The same comments apply to it. |
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[c257ec4e] | 93 | */ |
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[b2b4835] | 94 | . = ALIGN (16); |
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| 95 | *crtbegin.o(.ctors) |
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[c257ec4e] | 96 | *(.ctors) |
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[b2b4835] | 97 | *crtend.o(.ctors) |
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| 98 | *crtbegin.o(.dtors) |
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[c257ec4e] | 99 | *(.dtors) |
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[b2b4835] | 100 | *crtend.o(.dtors) |
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| 101 | |
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| 102 | /* |
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| 103 | * Exception frame info |
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| 104 | */ |
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| 105 | . = ALIGN (16); |
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| 106 | *(.eh_frame) |
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[c257ec4e] | 107 | |
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[b2b4835] | 108 | /* |
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| 109 | * Read-only data |
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| 110 | */ |
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| 111 | . = ALIGN (16); |
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[01c36de] | 112 | _rodata_start = . ; |
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| 113 | *(.rodata) |
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| 114 | *(.gnu.linkonce.r*) |
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| 115 | |
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[0af1b73f] | 116 | . = ALIGN (16); |
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[b2b4835] | 117 | PROVIDE (etext = .); |
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| 118 | } >ram |
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[c257ec4e] | 119 | .data : { |
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| 120 | copy_start = .; |
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| 121 | *(.data) |
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[01c36de] | 122 | *(.gnu.linkonce.d*) |
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| 123 | *(.gcc_except_table) |
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[c257ec4e] | 124 | . = ALIGN (16); |
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[b2b4835] | 125 | PROVIDE (_edata = .); |
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[c257ec4e] | 126 | copy_end = .; |
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| 127 | } >ram |
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| 128 | .bss : { |
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| 129 | M68Kvec = .; |
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| 130 | _M68Kvec = .; |
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| 131 | . += (256 * 4); |
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| 132 | clear_start = .; |
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| 133 | *(.bss) |
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| 134 | *(COMMON) |
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| 135 | . = ALIGN (16); |
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[b2b4835] | 136 | PROVIDE (end = .); |
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| 137 | |
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| 138 | . += StackSize; |
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| 139 | PROVIDE (_stack_init = .); |
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| 140 | |
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[c257ec4e] | 141 | . = ALIGN (16); |
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[b2b4835] | 142 | PROVIDE (_HeapStart = .); |
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| 143 | . += HeapSize; |
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| 144 | PROVIDE (_HeapEnd = .); |
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| 145 | |
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[c257ec4e] | 146 | clear_end = .; |
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| 147 | |
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| 148 | _WorkspaceBase = .; |
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| 149 | } >ram |
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| 150 | |
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| 151 | /* |
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| 152 | * On-chip memory/peripherals |
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| 153 | */ |
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| 154 | dpram : { |
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| 155 | m360 = .; |
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| 156 | _m360 = .; |
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| 157 | . += (8 * 1024); |
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| 158 | |
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| 159 | } >dpram |
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| 160 | } |
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