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001 /* Copyright (C) 2003, Thomas Petazzoni 001 /* Copyright (C) 2003, Thomas Petazzoni 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 /* We generate binary in the ELF format */ 019 /* We generate binary in the ELF format */ 020 OUTPUT_FORMAT("elf32-i386","elf32-i386","elf32 020 OUTPUT_FORMAT("elf32-i386","elf32-i386","elf32-i386"); 021 021 022 /* The entry point is _start (defined in boot. 022 /* The entry point is _start (defined in boot.S) */ 023 ENTRY(_start) 023 ENTRY(_start) 024 024 025 /* The architecture is i386 */ 025 /* The architecture is i386 */ 026 OUTPUT_ARCH("i386") 026 OUTPUT_ARCH("i386") 027 027 028 SECTIONS 028 SECTIONS 029 { 029 { 030 /* our kernel is loaded at 0x200000 */ 030 /* our kernel is loaded at 0x200000 */ 031 . = 0x200000; 031 . = 0x200000; 032 __b_load = .; 032 __b_load = .; 033 033 034 /* the multiboot header MUST come early en 034 /* the multiboot header MUST come early enough in the output 035 object file */ 035 object file */ 036 .multiboot : 036 .multiboot : 037 { 037 { 038 /* The multiboot section (containing t 038 /* The multiboot section (containing the multiboot header) 039 goes here */ 039 goes here */ 040 *(.multiboot); 040 *(.multiboot); 041 041 042 /* 042 /* 043 * With the following line, we force t 043 * With the following line, we force this section to be 044 * allocated in the output file as soo 044 * allocated in the output file as soon as possible, no matter 045 * when the file containing the multib 045 * when the file containing the multiboot header (multiboot.S) 046 * is compiled. This is to conform to 046 * is compiled. This is to conform to the multiboot spec, which 047 * says "The Multiboot header must be 047 * says "The Multiboot header must be contained completely 048 * within the first 8192 bytes of the 048 * within the first 8192 bytes of the OS image, and must be 049 * longword (32-bit) aligned." 049 * longword (32-bit) aligned." 050 */ 050 */ 051 LONG(0); 051 LONG(0); 052 } 052 } 053 053 054 /* Defines a symbol '__b_kernel to mark th 054 /* Defines a symbol '__b_kernel to mark the start of the kernel 055 code/data */ 055 code/data */ 056 . = ALIGN(4096); 056 . = ALIGN(4096); 057 __b_kernel = .; 057 __b_kernel = .; 058 058 059 /* Beginning of the text section */ 059 /* Beginning of the text section */ 060 .text ALIGN(4096) : 060 .text ALIGN(4096) : 061 { 061 { 062 /* This section includes the code */ 062 /* This section includes the code */ 063 *(.text*) 063 *(.text*) 064 /* Defines the 'etext' and '_etext' at 064 /* Defines the 'etext' and '_etext' at the end */ 065 PROVIDE(etext = .); 065 PROVIDE(etext = .); 066 PROVIDE(_etext = .); 066 PROVIDE(_etext = .); 067 } 067 } 068 068 069 /* Beginning of the data section */ 069 /* Beginning of the data section */ 070 .data . : 070 .data . : 071 { *(.data*) 071 { *(.data*) 072 PROVIDE(edata = .); 072 PROVIDE(edata = .); 073 PROVIDE(_edata = .); 073 PROVIDE(_edata = .); 074 } 074 } 075 075 076 /* Beginning of the read-only data section 076 /* Beginning of the read-only data section */ 077 .rodata . : 077 .rodata . : 078 { *(.rodata*) 078 { *(.rodata*) 079 *(.eh_frame*) << 080 << 081 /* For articles 7.5 and later, it is b << 082 "files" are located on a 4kB bounda << 083 binfmt_elf32 to share program pages << 084 user, alleviating the need to alloc << 085 user code */ << 086 . = ALIGN(4096); << 087 *(.userprogs) << 088 << 089 PROVIDE(erodata = .); 079 PROVIDE(erodata = .); 090 PROVIDE(_erodata = .); 080 PROVIDE(_erodata = .); 091 } 081 } 092 << 093 /* We take note of the end of the data to 082 /* We take note of the end of the data to load */ 094 __e_load = .; 083 __e_load = .; 095 084 096 /* Beginning of the BSS section (global un 085 /* Beginning of the BSS section (global uninitialized data) */ 097 .bss SIZEOF(.rodata) + ADDR(.rodata) : 086 .bss SIZEOF(.rodata) + ADDR(.rodata) : 098 { *(.bss) 087 { *(.bss) 099 *(COMMON) 088 *(COMMON) 100 << 101 /* We put the stack of the bootstrap t << 102 boundary, because it can be un-allo << 103 . = ALIGN(4096); << 104 *(.init_stack) << 105 << 106 PROVIDE(ebss = .); 089 PROVIDE(ebss = .); 107 PROVIDE(_ebss = .); 090 PROVIDE(_ebss = .); 108 } 091 } 109 092 110 /* We take note of the end of the kernel: !! 093 /* We take note of the end of the kernel */ 111 will begin */ << 112 __e_kernel = .; 094 __e_kernel = .; >> 095 >> 096 /* We don't care of the note, indent, comment, etc.. sections >> 097 generated by gcc */ >> 098 /DISCARD/ :{ >> 099 *(.note*) >> 100 *(.indent) >> 101 *(.comment) >> 102 *(.stab) >> 103 *(.stabstr) >> 104 } >> 105 113 } 106 } >> 107
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