| 1 | STARTUP(crt0.o) |
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| 2 | OUTPUT_ARCH(m68k) |
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| 3 | /* Uncomment this if you want srecords. This is needed for a.out |
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| 4 | * if you plan to use GDB. |
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| 5 | OUTPUT_FORMAT(srec) |
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| 6 | */ |
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| 7 | |
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| 8 | SEARCH_DIR(.) |
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| 9 | GROUP(-lidp -lc -lgcc) |
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| 10 | __DYNAMIC = 0; |
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| 11 | |
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| 12 | /* |
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| 13 | * Setup the memory map of the MC68ec0x0 Board (IDP) |
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| 14 | * stack grows down from high memory. This works for |
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| 15 | * both the rom68k and the mon68k monitors. |
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| 16 | * |
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| 17 | * The memory map look like this: |
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| 18 | * +--------------------+ <- low memory |
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| 19 | * | .text | |
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| 20 | * | _etext | |
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| 21 | * | ctor list | the ctor and dtor lists are for |
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| 22 | * | dtor list | C++ support |
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| 23 | * +--------------------+ |
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| 24 | * | .data | initialized data goes here |
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| 25 | * | _edata | |
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| 26 | * +--------------------+ |
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| 27 | * | .bss | |
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| 28 | * | __bss_start | start of bss, cleared by crt0 |
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| 29 | * | _end | start of heap, used by sbrk() |
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| 30 | * +--------------------+ |
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| 31 | * . . |
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| 32 | * . . |
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| 33 | * . . |
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| 34 | * | __stack | top of stack |
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| 35 | * +--------------------+ |
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| 36 | */ |
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| 37 | |
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| 38 | /* |
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| 39 | * When the IDP is not remapped (see rom68k's MP command in the |
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| 40 | * "M68EC0x0IDP Users Manual", the first 64K bytes are reserved; |
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| 41 | * Otherwise the first 256K bytes are reserved. |
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| 42 | * |
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| 43 | * The following memory map describes a unmapped IDP w/2MB RAM. |
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| 44 | */ |
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| 45 | |
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| 46 | MEMORY |
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| 47 | { |
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| 48 | ram (rwx) : ORIGIN = 0x00010000, LENGTH = 2M-64K |
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| 49 | rom0 : ORIGIN = 0x00800000, LENGTH = 1M |
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| 50 | rom1 : ORIGIN = 0x00900000, LENGTH = 1M |
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| 51 | } |
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| 52 | |
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| 53 | /* |
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| 54 | * allocate the stack to be at the top of memory, since the stack |
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| 55 | * grows down |
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| 56 | */ |
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| 57 | |
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| 58 | PROVIDE (__stack = 2M - 8); |
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| 59 | |
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| 60 | /* |
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| 61 | * Initalize some symbols to be zero so we can reference them in the |
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| 62 | * crt0 without core dumping. These functions are all optional, but |
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| 63 | * we do this so we can have our crt0 always use them if they exist. |
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| 64 | * This is so BSPs work better when using the crt0 installed with gcc. |
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| 65 | * We have to initalize them twice, so we cover a.out (which prepends |
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| 66 | * an underscore) and coff object file formats. |
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| 67 | */ |
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| 68 | PROVIDE (hardware_init_hook = 0); |
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| 69 | PROVIDE (_hardware_init_hook = 0); |
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| 70 | PROVIDE (software_init_hook = 0); |
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| 71 | PROVIDE (_software_init_hook = 0); |
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| 72 | /* |
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| 73 | * stick everything in ram (of course) |
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| 74 | */ |
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| 75 | SECTIONS |
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| 76 | { |
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| 77 | .text : |
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| 78 | { |
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| 79 | CREATE_OBJECT_SYMBOLS |
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| 80 | *(.text .text.*) |
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| 81 | |
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| 82 | . = ALIGN(0x4); |
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| 83 | /* These are for running static constructors and destructors under ELF. */ |
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| 84 | KEEP (*crtbegin.o(.ctors)) |
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| 85 | KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors)) |
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| 86 | KEEP (*(SORT(.ctors.*))) |
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| 87 | KEEP (*(.ctors)) |
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| 88 | KEEP (*crtbegin.o(.dtors)) |
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| 89 | KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors)) |
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| 90 | KEEP (*(SORT(.dtors.*))) |
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| 91 | KEEP (*(.dtors)) |
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| 92 | |
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| 93 | *(.rodata .rodata.*) |
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| 94 | |
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| 95 | . = ALIGN(0x4); |
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| 96 | *(.gcc_except_table) |
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| 97 | |
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| 98 | . = ALIGN(0x4); |
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| 99 | *(.eh_frame) |
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| 100 | |
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| 101 | . = ALIGN(0x4); |
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| 102 | __INIT_SECTION__ = . ; |
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| 103 | LONG (0x4e560000) /* linkw %fp,#0 */ |
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| 104 | *(.init) |
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| 105 | SHORT (0x4e5e) /* unlk %fp */ |
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| 106 | SHORT (0x4e75) /* rts */ |
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| 107 | |
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| 108 | . = ALIGN(0x4); |
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| 109 | __FINI_SECTION__ = . ; |
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| 110 | LONG (0x4e560000) /* linkw %fp,#0 */ |
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| 111 | *(.fini) |
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| 112 | SHORT (0x4e5e) /* unlk %fp */ |
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| 113 | SHORT (0x4e75) /* rts */ |
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| 114 | |
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| 115 | _etext = .; |
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| 116 | *(.lit) |
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| 117 | } > ram |
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| 118 | |
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| 119 | .data : |
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| 120 | { |
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| 121 | *(.got.plt) *(.got) |
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| 122 | *(.shdata) |
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| 123 | *(.data .data.*) |
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| 124 | _edata = .; |
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| 125 | } > ram |
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| 126 | |
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| 127 | .bss : |
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| 128 | { |
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| 129 | . = ALIGN(0x4); |
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| 130 | __bss_start = . ; |
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| 131 | *(.shbss) |
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| 132 | *(.bss .bss.*) |
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| 133 | *(COMMON) |
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| 134 | _end = ALIGN (0x8); |
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| 135 | __end = _end; |
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| 136 | } > ram |
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| 137 | |
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| 138 | .stab 0 (NOLOAD) : |
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| 139 | { |
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| 140 | *(.stab) |
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| 141 | } |
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| 142 | |
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| 143 | .stabstr 0 (NOLOAD) : |
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| 144 | { |
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| 145 | *(.stabstr) |
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| 146 | } |
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| 147 | } |
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