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(0);  /* ___ */
  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   . = ALIGN(4096);
  82   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
  83         __nosave_begin = .;
  84         *(.data.nosave)
  85         . = ALIGN(4096);
  86         __nosave_end = .;
  87   }
  88
  89   . = ALIGN(4096);
  90   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
  91         *(.data.idt)
  92   }
  93
  94   . = ALIGN(32);
  95   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
  96         *(.data.cacheline_aligned)
  97   }
  98
  99   /* rarely changed data like cpu maps */
 100   . = ALIGN(32);
 101   .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 102         *(.data.read_mostly)
 103         _edata = .;             /* End of data section */
 104   }
 105
 106   . = ALIGN(THREAD_SIZE);       /* init_task */
 107   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 108         *(.data.init_task)
 109   }
 110
 111   /* might get freed after init */
 112   . = ALIGN(4096);
 113   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 114         __smp_locks = .;
 115         *(.smp_locks)
 116         __smp_locks_end = .;
 117   }
 118   /* will be freed after init
 119    * Following ALIGN() is required to make sure no other data falls on the
 120    * same page where __smp_alt_end is pointing as that page might be freed
 121    * after boot. Always make sure that ALIGN() directive is present after
 122    * the section which contains __smp_alt_end.
 123    */
 124   . = ALIGN(4096);
 125
 126   /* will be freed after init */
 127   . = ALIGN(4096);              /* Init code and data */
 128   .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 129         __init_begin = .;
 130         _sinittext = .;
 131         *(.init.text)
 132         _einittext = .;
 133   }
 134   .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { *(.init.data) }
 135   . = ALIGN(16);
 136   .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 137         __setup_start = .;
 138         *(.init.setup)
 139         __setup_end = .;
 140    }
 141   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 142         __initcall_start = .;
 143         INITCALLS
 144         __initcall_end = .;
 145   }
 146   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 147         __con_initcall_start = .;
 148         *(.con_initcall.init)
 149         __con_initcall_end = .;
 150   }
 151   SECURITY_INIT
 152   . = ALIGN(4);
 153   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 154         __alt_instructions = .;
 155         *(.altinstructions)
 156         __alt_instructions_end = .;
 157   }
 158   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
 159         *(.altinstr_replacement)
 160   }
 161   . = ALIGN(4);
 162   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 163         __parainstructions = .;
 164         *(.parainstructions)
 165         __parainstructions_end = .;
 166   }
 167   /* .exit.text is discard at runtime, not link time, to deal with references
 168      from .altinstructions and .eh_frame */
 169   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { *(.exit.text) }
 170   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { *(.exit.data) }
 171 #if defined(CONFIG_BLK_DEV_INITRD)
 172   . = ALIGN(4096);
 173   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 174         __initramfs_start = .;
 175         *(.init.ramfs)
 176         __initramfs_end = .;
 177   }
 178 #endif
 179   . = ALIGN(4096);
 180   .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
 181         __per_cpu_start = .;
 182         *(.data.percpu)
 183         __per_cpu_end = .;
 184   }
 185   . = ALIGN(4096);
 186   /* freed after init ends here */
 187
 188   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 189         __init_end = .;
 190         __bss_start = .;                /* BSS */
 191         *(.bss.page_aligned)
 192         *(.bss)
 193         . = ALIGN(4);
 194         __bss_stop = .;
 195         _end = . ;
 196         /* This is where the kernel creates the early boot page tables */
 197         . = ALIGN(4096);
 198         pg0 = . ;
 199   }
 200
 201   /* Sections to be discarded */
 202   /DISCARD/ : {
 203         *(.exitcall.exit)
 204         }
 205
 206   STABS_DEBUG
 207
 208   DWARF_DEBUG
 209
 210   NOTES
 211 }