forked from Imagelibrary/rtems
204 lines
6.1 KiB
Plaintext
204 lines
6.1 KiB
Plaintext
/*
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* This file contains directives for the GNU linker which are specific
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* to the Intel 386ex evaluation board.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*
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* Memory layout:
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*
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* 0x3f80000 -> 0x3ff0000 : text section
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* 0x3ff0000 -> 0x3ff0028 : global descriptor table in ROM
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* 0x3ff0028 -> 0x3fff000 : data section ( copied by start.s to RAM )
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* 0x3fff000 -> 0x3fffff0 : initial section ( init 386ex, goto protected mode, copy ROM-RAM )
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* 0x3fffff0 -> 0x4000000 : reset section ( jmp to initial only )
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*/
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ENTRY(reset) ;
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SECTIONS
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{
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/****************************************************************************************
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* data section:
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*
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* This section defines the locations of the data section in ROM as well as in RAM.
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* start.s copies the data section to RAM in real mode. This is done PRIOR to the lgdt
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* instruction since the data section contains the Global_descriptor_table and GDTR.
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***********************************************************************************/
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_rom_data_start = 0x3ff0000;
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_rom_data_segment = 0xF000;
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_rom_data_offset = 0x0;
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_ram_data_segment = 0x0000 ;
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_ram_data_offset = 0x0;
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_ram_data_location = _ram_data_segment * 16 + _ram_data_offset;
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.init : { _init = .; *(.init) } = 0x9090
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.fini : { _fini = .; *(.fini) } = 0x9090
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.data :
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AT ( _rom_data_start )
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{
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_sdata = .;
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*(.data);
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*(.gnu.linkonce.d*)
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*(.gcc_except_table)
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_edata = .;
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}
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_data_start = ADDR(.data) ;
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data_start = _data_start ;
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_data_size = _edata - _sdata ;
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/**************************************************************************************
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* bss section:
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*
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* The bss section is the last section in RAM.
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*************************************************************************************/
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_edata = ALIGN( 0x10 );
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.bss :
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{
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_bss_start = .;
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*(.bss);
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*(COMMON);
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_ebss = ALIGN(0x10);
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end = _ebss;
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_end = end;
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__end = end;
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}
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_bss_size = _ebss - _bss_start ;
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/**************************************************************************************
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* General variables:
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*
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* The stack_size variable is customizable here. The heap is located directly after
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* The stack in RAM. A routine within bspstart.c uses these variables to ensure that
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* the heap used by RTEMS is as large as the RAM remaining after all workspace configurations
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* are complete.
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*************************************************************************************/
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stack_size = 0x8000 ;
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stack_origin = end + stack_size ;
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heap_bottom = stack_origin + 4 ;
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/***************************************************************************************
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* text section:
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*
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* This section is NOT copied into RAM. It is left in ROM, as the flash ROM is quick enough.
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***************************************************************************************/
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.text ( 0x3f80000 ):
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{
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CREATE_OBJECT_SYMBOLS
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text_start = . ;
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_text_start = . ;
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*(.text ) ;
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/*
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* Special FreeBSD sysctl sections.
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*/
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. = ALIGN (16);
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__start_set_sysctl_set = .;
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*(set_sysctl_*);
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__stop_set_sysctl_set = ABSOLUTE(.);
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*(set_domain_*);
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*(set_pseudo_*);
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*(.eh_fram)
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. = ALIGN (16);
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/*
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* C++ constructors
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*/
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__CTOR_LIST__ = .;
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LONG((__CTOR_END__ - __CTOR_LIST__) / 4 - 2)
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*(.ctors)
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LONG(0)
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__CTOR_END__ = .;
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. = ALIGN (4) ;
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__DTOR_LIST__ = .;
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LONG((__DTOR_END__ - __DTOR_LIST__) / 4 - 2)
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*(.dtors)
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LONG(0)
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__DTOR_END__ = .;
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_rodata_start = . ;
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*(.rodata*)
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*(.eh_frame)
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*(.gnu.linkonce.r*)
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_erodata = ALIGN( 0x10 ) ;
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_etext = ALIGN( 0x10 );
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_endtext = . ;
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}
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/*******************************************************************************************
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* initial section:
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*
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* This section is defined after the data section. It must be in the top 64K of memory
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* to enable the initial short jmp from the reset section while still in real-mode. It
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* initializes the i386ex, moves the gdt from ROM to RAM,loads the gdt,
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* jumps to protected mode, copies the data section from ROM to RAM and loads the idt.
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******************************************************************************************/
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.initial _rom_data_start + _data_size :
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{
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*(.initial);
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}
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/*******************************************************************************************
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* board reset section:
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*
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* This section contains the short jmp from the reset section to the initial section. It is
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* the first code executed on reset/power on.
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******************************************************************************************/
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.reset 0x3fffff0:
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{
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*(.reset);
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}
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/* Stabs debugging sections. */
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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/* DWARF debug sections.
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Symbols in the DWARF debugging sections are relative to the beginning
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of the section so we begin them at 0. */
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/* DWARF 1 */
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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/* GNU DWARF 1 extensions */
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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/* DWARF 1.1 and DWARF 2 */
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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/* DWARF 2 */
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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/* SGI/MIPS DWARF 2 extensions */
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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/* These must appear regardless of . */
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}
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