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 _proxy_pda = 1;
  30
  31 PHDRS {
  32         text PT_LOAD FLAGS(5);  /* R_E */
  33         data PT_LOAD FLAGS(7);  /* RWE */
  34         note PT_NOTE FLAGS(4);  /* R__ */
  35 }
  36 SECTIONS
  37 {
  38   . = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
  39   phys_startup_32 = startup_32 - LOAD_OFFSET;
  40
  41   .text.head : AT(ADDR(.text.head) - LOAD_OFFSET) {
  42         _text = .;                      /* Text and read-only data */
  43         *(.text.head)
  44   } :text = 0x9090
  45
  46   /* read-only */
  47   .text : AT(ADDR(.text) - LOAD_OFFSET) {
  48         *(.text)
  49         SCHED_TEXT
  50         LOCK_TEXT
  51         KPROBES_TEXT
  52         *(.fixup)
  53         *(.gnu.warning)
  54         _etext = .;                     /* End of text section */
  55   } :text = 0x9090
  56
  57   . = ALIGN(16);                /* Exception table */
  58   __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
  59         __start___ex_table = .;
  60          *(__ex_table)
  61         __stop___ex_table = .;
  62   }
  63
  64   BUG_TABLE
  65
  66   . = ALIGN(4);
  67   .tracedata : AT(ADDR(.tracedata) - LOAD_OFFSET) {
  68         __tracedata_start = .;
  69         *(.tracedata)
  70         __tracedata_end = .;
  71   }
  72
  73   RODATA
  74
  75   /* writeable */
  76   . = ALIGN(4096);
  77   .data : AT(ADDR(.data) - LOAD_OFFSET) {       /* Data */
  78         *(.data)
  79         CONSTRUCTORS
  80         } :data
  81
  82   .paravirtprobe : AT(ADDR(.paravirtprobe) - LOAD_OFFSET) {
  83         __start_paravirtprobe = .;
  84         *(.paravirtprobe)
  85         __stop_paravirtprobe = .;
  86   }
  87
  88   . = ALIGN(4096);
  89   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
  90         __nosave_begin = .;
  91         *(.data.nosave)
  92         . = ALIGN(4096);
  93         __nosave_end = .;
  94   }
  95
  96   . = ALIGN(4096);
  97   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
  98         *(.data.idt)
  99   }
 100
 101   . = ALIGN(32);
 102   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
 103         *(.data.cacheline_aligned)
 104   }
 105
 106   /* rarely changed data like cpu maps */
 107   . = ALIGN(32);
 108   .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
 109         *(.data.read_mostly)
 110         _edata = .;             /* End of data section */
 111   }
 112
 113   . = ALIGN(THREAD_SIZE);       /* init_task */
 114   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 115         *(.data.init_task)
 116   }
 117
 118   /* might get freed after init */
 119   . = ALIGN(4096);
 120   .smp_altinstructions : AT(ADDR(.smp_altinstructions) - LOAD_OFFSET) {
 121         __smp_alt_begin = .;
 122         __smp_alt_instructions = .;
 123         *(.smp_altinstructions)
 124         __smp_alt_instructions_end = .;
 125   }
 126   . = ALIGN(4);
 127   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 128         __smp_locks = .;
 129         *(.smp_locks)
 130         __smp_locks_end = .;
 131   }
 132   .smp_altinstr_replacement : AT(ADDR(.smp_altinstr_replacement) - LOAD_OFFSET) {
 133         *(.smp_altinstr_replacement)
 134         __smp_alt_end = .;
 135   }
 136   /* will be freed after init
 137    * Following ALIGN() is required to make sure no other data falls on the
 138    * same page where __smp_alt_end is pointing as that page might be freed
 139    * after boot. Always make sure that ALIGN() directive is present after
 140    * the section which contains __smp_alt_end.
 141    */
 142   . = ALIGN(4096);
 143
 144   /* will be freed after init */
 145   . = ALIGN(4096);              /* Init code and data */
 146   .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 147         __init_begin = .;
 148         _sinittext = .;
 149         *(.init.text)
 150         _einittext = .;
 151   }
 152   .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) { *(.init.data) }
 153   . = ALIGN(16);
 154   .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 155         __setup_start = .;
 156         *(.init.setup)
 157         __setup_end = .;
 158    }
 159   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 160         __initcall_start = .;
 161         INITCALLS
 162         __initcall_end = .;
 163   }
 164   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 165         __con_initcall_start = .;
 166         *(.con_initcall.init)
 167         __con_initcall_end = .;
 168   }
 169   SECURITY_INIT
 170   . = ALIGN(4);
 171   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 172         __alt_instructions = .;
 173         *(.altinstructions)
 174         __alt_instructions_end = .;
 175   }
 176   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
 177         *(.altinstr_replacement)
 178   }
 179   . = ALIGN(4);
 180   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 181         __start_parainstructions = .;
 182         *(.parainstructions)
 183         __stop_parainstructions = .;
 184   }
 185   /* .exit.text is discard at runtime, not link time, to deal with references
 186      from .altinstructions and .eh_frame */
 187   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { *(.exit.text) }
 188   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { *(.exit.data) }
 189 #if defined(CONFIG_BLK_DEV_INITRD)
 190   . = ALIGN(4096);
 191   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 192         __initramfs_start = .;
 193         *(.init.ramfs)
 194         __initramfs_end = .;
 195   }
 196 #endif
 197   . = ALIGN(4096);
 198   .data.percpu  : AT(ADDR(.data.percpu) - LOAD_OFFSET) {
 199         __per_cpu_start = .;
 200         *(.data.percpu)
 201         __per_cpu_end = .;
 202   }
 203   . = ALIGN(4096);
 204   /* freed after init ends here */
 205
 206   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 207         __init_end = .;
 208         __bss_start = .;                /* BSS */
 209         *(.bss.page_aligned)
 210         *(.bss)
 211         . = ALIGN(4);
 212         __bss_stop = .;
 213         _end = . ;
 214         /* This is where the kernel creates the early boot page tables */
 215         . = ALIGN(4096);
 216         pg0 = . ;
 217   }
 218
 219   /* Sections to be discarded */
 220   /DISCARD/ : {
 221         *(.exitcall.exit)
 222         }
 223
 224   STABS_DEBUG
 225
 226   DWARF_DEBUG
 227
 228   NOTES
 229 }