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/*
* This file contains GNU linker directives for a generic MC68340/349 board.
* Variations in hardware type and dynamic memory size can be made
* by overriding some values with linker command-line arguments.
*
* ATTENTION: RAM and ROM placement must accord those in start340.S!!
* (next time I'll use some shared variables :) )
*
* Geoffroy Montel
* France Telecom - CNET/DSM/TAM/CAT
* 4, rue du Clos Courtel
* 35512 CESSON-SEVIGNE
* FRANCE
*
* e-mail: g_montel@yahoo.com
*
* $Id$
*/
/*
* Declare some sizes.
*/
_RamBase = 0x10000000;
_RamSize = DEFINED(_RamSize) ? _RamSize : 4M;
_HeapSize = DEFINED(_HeapSize) ? _HeapSize : 0x10000;
_StackSize = DEFINED(_StackSize) ? _StackSize : 0x1000;
/*
* Declare on-board memory.
* It would be nice if the ram length could be given as
* LENGTH=_RamSize, but gld doesn't allow non-constant
* values in the LENGTH expression.
*/
MEMORY {
ram : ORIGIN = 0x10000000, LENGTH = 4M
rom : ORIGIN = 0x01000000, LENGTH = 4M
/* dpram : ORIGIN = 0xFE000000, LENGTH = 8k */
}
/*
* Declare low-order three octets of Ethernet address.
*/
ETHERNET_ADDRESS = DEFINED(ETHERNET_ADDRESS) ? ETHERNET_ADDRESS : 0xDEAD12;
/*
* Load objects
*/
SECTIONS {
/*
* Boot PROM
*/
rom : {
_RomBase = .;
__RomBase = .;
} >rom
/*
* Dynamic RAM
*/
ram : {
. = .;
} >ram
/*
* Text, data and bss segments
*/
.text : {
*(.text)
/*
* C++ constructors/destructors
*/
*(.gnu.linkonce.t.*)
/*
* Initialization and finalization code.
*
* Various files can provide initialization and finalization
* functions. crtbegin.o and crtend.o are two instances. The
* body of these functions are in .init and .fini sections. We
* accumulate the bodies here, and prepend function prologues
* from crti.o and function epilogues from crtn.o. crti.o must
* be linked first; crtn.o must be linked last. Because these
* are wildcards, it doesn't matter if the user does not
* actually link against crti.o and crtn.o; the linker won't
* look for a file to match a wildcard. The wildcard also
* means that it doesn't matter which directory crti.o and
* crtn.o are in.
*/
PROVIDE (_init = .);
*crti.o(.init)
*(.init)
*crtn.o(.init)
PROVIDE (_fini = .);
*crti.o(.fini)
*(.fini)
*crtn.o(.fini)
/*
* C++ constructors/destructors
*
* gcc uses crtbegin.o to find the start of the constructors
* and destructors so we make sure it is first. Because this
* is a wildcard, it doesn't matter if the user does not
* actually link against crtbegin.o; the linker won't look for
* a file to match a wildcard. The wildcard also means that
* it doesn't matter which directory crtbegin.o is in. The
* constructor and destructor list are terminated in
* crtend.o. The same comments apply to it.
*/
. = ALIGN (16);
*crtbegin.o(.ctors)
*(.ctors)
*crtend.o(.ctors)
*crtbegin.o(.dtors)
*(.dtors)
*crtend.o(.dtors)
/*
* Exception frame info
*/
. = ALIGN (16);
*(.eh_frame)
/*
* Read-only data
*/
. = ALIGN (16);
_rodata_start = . ;
*(.rodata)
*(.gnu.linkonce.r*)
. = ALIGN (16);
PROVIDE (_etext = .);
} >ram
.data : {
PROVIDE (_copy_start = .);
*(.data)
*(.gnu.linkonce.d*)
*(.gcc_except_table)
. = ALIGN (16);
PROVIDE (_edata = .);
PROVIDE (_copy_end = .);
} >ram
.bss : {
M68Kvec = .;
. += (256 * 4);
_clear_start = .;
*(.bss)
*(COMMON)
. = ALIGN (16);
PROVIDE (end = .);
. += _StackSize;
. = ALIGN (16);
_stack_init = .;
_clear_end = .;
_WorkspaceBase = .;
} >ram
/*
* On-chip memory/peripherals
*
*/
dpram : {
m340 = .;
_m340 = .;
. += (8 * 1024);
} >ram
}
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