arch/i386/kernel/vmlinux.lds.S

   1 /* ld script to make i386 Linux kernel
   2  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
   3  *
   4  * Don't define absolute symbols until and unless you know that symbol
   5  * value is should remain constant even if kernel image is relocated
   6  * at run time. Absolute symbols are not relocated. If symbol value should
   7  * change if kernel is relocated, make the symbol section relative and
   8  * put it inside the section definition.
   9  */
  10
  11 /* Don't define absolute symbols until and unless you know that symbol
  12  * value is should remain constant even if kernel image is relocated
  13  * at run time. Absolute symbols are not relocated. If symbol value should
  14  * change if kernel is relocated, make the symbol section relative and
  15  * put it inside the section definition.
  16  */
  17 #define LOAD_OFFSET __PAGE_OFFSET
  18
  19 #include <asm-generic/vmlinux.lds.h>
  20 #include <asm/thread_info.h>
  21 #include <asm/page.h>
  22 #include <asm/cache.h>
  23 #include <asm/boot.h>
  24
  25 OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
  26 OUTPUT_ARCH(i386)
  27 ENTRY(phys_startup_32)
  28 jiffies = jiffies_64;
  29
  30 PHDRS {
  31         text PT_LOAD FLAGS(5);  /* R_E */
  32         data PT_LOAD FLAGS(7);  /* RWE */
  33         note PT_NOTE FLAGS(4);  /* R__ */
  34 }
  35 SECTIONS
  36 {
  37   . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
  38   phys_startup_32 = startup_32 - LOAD_OFFSET;
  39
  40   .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
  41         _text = .;                      /* Text and read-only data */
  42         *(.text.head)
  43   } :text = 0x9090
  44
  45   /* read-only */
  46   .text : AT(ADDR(.text) - LOAD_OFFSET) {
  47         *(.text)
  48         SCHED_TEXT
  49         LOCK_TEXT
  50         KPROBES_TEXT
  51         *(.fixup)
  52         *(.gnu.warning)
  53         _etext = .;                     /* End of text section */
  54   } :text = 0x9090
  55
  56   . = ALIGN(16);                /* Exception table */
  57   __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
  58         __start___ex_table = .;
  59          *(__ex_table)
  60         __stop___ex_table = .;
  61   }
  62
  63   BUG_TABLE
  64
  65   . = ALIGN(4);
  66   .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
  67         __tracedata_start = .;
  68         *(.tracedata)
  69         __tracedata_end = .;
  70   }
  71
  72   RODATA
  73
  74   /* writeable */
  75   . = ALIGN(4096);
  76   .data : AT(ADDR(.data) - LOAD_OFFSET) {       /* Data */
  77         *(.data)
  78         CONSTRUCTORS
  79         } :data
  80
  81   .paravirtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) {
  82         __start_paravirtprobe = .;
  83         *(.paravirtprobe)
  84         __stop_paravirtprobe = .;
  85   }
  86
  87   . = ALIGN(4096);
  88   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
  89         __nosave_begin = .;
  90         *(.data.nosave)
  91         . = ALIGN(4096);
  92         __nosave_end = .;
  93   }
  94
  95   . = ALIGN(4096);
  96   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
  97         *(.data.idt)
  98   }
  99
 100   . = ALIGN(32);
 101   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 102         *(.data.cacheline_aligned)
 103   }
 104
 105   /* rarely changed data like cpu maps */
 106   . = ALIGN(32);
 107   .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 108         *(.data.read_mostly)
 109         _edata = .;             /* End of data section */
 110   }
 111
 112   . = ALIGN(THREAD_SIZE);       /* init_task */
 113   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 114         *(.data.init_task)
 115   }
 116
 117   /* might get freed after init */
 118   . = ALIGN(4096);
 119   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 120         __smp_locks = .;
 121         *(.smp_locks)
 122         __smp_locks_end = .;
 123   }
 124   /* will be freed after init
 125    * Following ALIGN() is required to make sure no other data falls on the
 126    * same page where __smp_alt_end is pointing as that page might be freed
 127    * after boot. Always make sure that ALIGN() directive is present after
 128    * the section which contains __smp_alt_end.
 129    */
 130   . = ALIGN(4096);
 131
 132   /* will be freed after init */
 133   . = ALIGN(4096);              /* Init code and data */
 134   .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 135         __init_begin = .;
 136         _sinittext = .;
 137         *(.init.text)
 138         _einittext = .;
 139   }
 140   .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { *(.init.data) }
 141   . = ALIGN(16);
 142   .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 143         __setup_start = .;
 144         *(.init.setup)
 145         __setup_end = .;
 146    }
 147   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 148         __initcall_start = .;
 149         INITCALLS
 150         __initcall_end = .;
 151   }
 152   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 153         __con_initcall_start = .;
 154         *(.con_initcall.init)
 155         __con_initcall_end = .;
 156   }
 157   SECURITY_INIT
 158   . = ALIGN(4);
 159   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 160         __alt_instructions = .;
 161         *(.altinstructions)
 162         __alt_instructions_end = .;
 163   }
 164   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
 165         *(.altinstr_replacement)
 166   }
 167   . = ALIGN(4);
 168   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 169         __start_parainstructions = .;
 170         *(.parainstructions)
 171         __stop_parainstructions = .;
 172   }
 173   /* .exit.text is discard at runtime, not link time, to deal with references
 174      from .altinstructions and .eh_frame */
 175   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { *(.exit.text) }
 176   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { *(.exit.data) }
 177 #if defined(CONFIG_BLK_DEV_INITRD)
 178   . = ALIGN(4096);
 179   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 180         __initramfs_start = .;
 181         *(.init.ramfs)
 182         __initramfs_end = .;
 183   }
 184 #endif
 185   . = ALIGN(4096);
 186   .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
 187         __per_cpu_start = .;
 188         *(.data.percpu)
 189         __per_cpu_end = .;
 190   }
 191   . = ALIGN(4096);
 192   /* freed after init ends here */
 193
 194   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 195         __init_end = .;
 196         __bss_start = .;                /* BSS */
 197         *(.bss.page_aligned)
 198         *(.bss)
 199         . = ALIGN(4);
 200         __bss_stop = .;
 201         _end = . ;
 202         /* This is where the kernel creates the early boot page tables */
 203         . = ALIGN(4096);
 204         pg0 = . ;
 205   }
 206
 207   /* Sections to be discarded */
 208   /DISCARD/ : {
 209         *(.exitcall.exit)
 210         }
 211
 212   STABS_DEBUG
 213
 214   DWARF_DEBUG
 215
 216   NOTES
 217 }