arch/x86/kernel/vmlinux_64.lds.S

   1 /* ld script to make x86-64 Linux kernel
   2  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
   3  */
   4
   5 #define LOAD_OFFSET __START_KERNEL_map
   6
   7 #include <asm-generic/vmlinux.lds.h>
   8 #include <asm/asm-offsets.h>
   9 #include <asm/page.h>
  10
  11 #undef i386     /* in case the preprocessor is a 32bit one */
  12
  13 OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64", "elf64-x86-64")
  14 OUTPUT_ARCH(i386:x86-64)
  15 ENTRY(phys_startup_64)
  16 jiffies_64 = jiffies;
  17 PHDRS {
  18         text PT_LOAD FLAGS(5);  /* R_E */
  19         data PT_LOAD FLAGS(7);  /* RWE */
  20         user PT_LOAD FLAGS(7);  /* RWE */
  21         data.init PT_LOAD FLAGS(7);     /* RWE */
  22 #ifdef CONFIG_SMP
  23         percpu PT_LOAD FLAGS(7);        /* RWE */
  24 #endif
  25         data.init2 PT_LOAD FLAGS(7);    /* RWE */
  26         note PT_NOTE FLAGS(0);  /* ___ */
  27 }
  28 SECTIONS
  29 {
  30   . = __START_KERNEL;
  31   phys_startup_64 = startup_64 - LOAD_OFFSET;
  32   _text = .;                    /* Text and read-only data */
  33   .text :  AT(ADDR(.text) - LOAD_OFFSET) {
  34         /* First the code that has to be first for bootstrapping */
  35         *(.text.head)
  36         _stext = .;
  37         /* Then the rest */
  38         TEXT_TEXT
  39         SCHED_TEXT
  40         LOCK_TEXT
  41         KPROBES_TEXT
  42         IRQENTRY_TEXT
  43         *(.fixup)
  44         *(.gnu.warning)
  45         _etext = .;             /* End of text section */
  46   } :text = 0x9090
  47
  48   NOTES :text :note
  49
  50   . = ALIGN(16);                /* Exception table */
  51   __ex_table : AT(ADDR(__ex_table) - LOAD_OFFSET) {
  52         __start___ex_table = .;
  53          *(__ex_table)
  54         __stop___ex_table = .;
  55   } :text = 0x9090
  56
  57   RODATA
  58
  59   . = ALIGN(PAGE_SIZE);         /* Align data segment to page size boundary */
  60                                 /* Data */
  61   .data : AT(ADDR(.data) - LOAD_OFFSET) {
  62         DATA_DATA
  63         CONSTRUCTORS
  64         } :data
  65
  66   _edata = .;                   /* End of data section */
  67
  68   . = ALIGN(PAGE_SIZE);
  69   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
  70   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
  71         *(.data.cacheline_aligned)
  72   }
  73   . = ALIGN(CONFIG_X86_INTERNODE_CACHE_BYTES);
  74   .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) {
  75         *(.data.read_mostly)
  76   }
  77
  78 #define VSYSCALL_ADDR (-10*1024*1024)
  79 #define VSYSCALL_PHYS_ADDR ((LOADADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
  80 #define VSYSCALL_VIRT_ADDR ((ADDR(.data.read_mostly) + SIZEOF(.data.read_mostly) + 4095) & ~(4095))
  81
  82 #define VLOAD_OFFSET (VSYSCALL_ADDR - VSYSCALL_PHYS_ADDR)
  83 #define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
  84
  85 #define VVIRT_OFFSET (VSYSCALL_ADDR - VSYSCALL_VIRT_ADDR)
  86 #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
  87
  88   . = VSYSCALL_ADDR;
  89   .vsyscall_0 :  AT(VSYSCALL_PHYS_ADDR) { *(.vsyscall_0) } :user
  90   __vsyscall_0 = VSYSCALL_VIRT_ADDR;
  91
  92   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
  93   .vsyscall_fn : AT(VLOAD(.vsyscall_fn)) { *(.vsyscall_fn) }
  94   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
  95   .vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data))
  96                 { *(.vsyscall_gtod_data) }
  97   vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
  98   .vsyscall_clock : AT(VLOAD(.vsyscall_clock))
  99                 { *(.vsyscall_clock) }
 100   vsyscall_clock = VVIRT(.vsyscall_clock);
 101
 102
 103   .vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1))
 104                 { *(.vsyscall_1) }
 105   .vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2))
 106                 { *(.vsyscall_2) }
 107
 108   .vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) { *(.vgetcpu_mode) }
 109   vgetcpu_mode = VVIRT(.vgetcpu_mode);
 110
 111   . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
 112   .jiffies : AT(VLOAD(.jiffies)) { *(.jiffies) }
 113   jiffies = VVIRT(.jiffies);
 114
 115   .vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3))
 116                 { *(.vsyscall_3) }
 117
 118   . = VSYSCALL_VIRT_ADDR + PAGE_SIZE;
 119
 120 #undef VSYSCALL_ADDR
 121 #undef VSYSCALL_PHYS_ADDR
 122 #undef VSYSCALL_VIRT_ADDR
 123 #undef VLOAD_OFFSET
 124 #undef VLOAD
 125 #undef VVIRT_OFFSET
 126 #undef VVIRT
 127
 128   . = ALIGN(THREAD_SIZE);       /* init_task */
 129   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 130         *(.data.init_task)
 131   }:data.init
 132
 133   . = ALIGN(PAGE_SIZE);
 134   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
 135         *(.data.page_aligned)
 136   }
 137
 138   /* might get freed after init */
 139   . = ALIGN(PAGE_SIZE);
 140   __smp_alt_begin = .;
 141   __smp_locks = .;
 142   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 143         *(.smp_locks)
 144   }
 145   __smp_locks_end = .;
 146   . = ALIGN(PAGE_SIZE);
 147   __smp_alt_end = .;
 148
 149   . = ALIGN(PAGE_SIZE);         /* Init code and data */
 150   __init_begin = .;
 151   .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 152         _sinittext = .;
 153         INIT_TEXT
 154         _einittext = .;
 155   }
 156   .init.data : AT(ADDR(.init.data) - LOAD_OFFSET) {
 157         __initdata_begin = .;
 158         INIT_DATA
 159         __initdata_end = .;
 160    }
 161
 162   . = ALIGN(16);
 163   __setup_start = .;
 164   .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) { *(.init.setup) }
 165   __setup_end = .;
 166   __initcall_start = .;
 167   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 168         INITCALLS
 169   }
 170   __initcall_end = .;
 171   __con_initcall_start = .;
 172   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 173         *(.con_initcall.init)
 174   }
 175   __con_initcall_end = .;
 176   __x86_cpu_dev_start = .;
 177   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
 178         *(.x86_cpu_dev.init)
 179   }
 180   __x86_cpu_dev_end = .;
 181   SECURITY_INIT
 182
 183   . = ALIGN(8);
 184   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 185   __parainstructions = .;
 186        *(.parainstructions)
 187   __parainstructions_end = .;
 188   }
 189
 190   . = ALIGN(8);
 191   __alt_instructions = .;
 192   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 193         *(.altinstructions)
 194   }
 195   __alt_instructions_end = .;
 196   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
 197         *(.altinstr_replacement)
 198   }
 199   /* .exit.text is discard at runtime, not link time, to deal with references
 200      from .altinstructions and .eh_frame */
 201   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 202         EXIT_TEXT
 203   }
 204   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
 205         EXIT_DATA
 206   }
 207
 208 #ifdef CONFIG_BLK_DEV_INITRD
 209   . = ALIGN(PAGE_SIZE);
 210   __initramfs_start = .;
 211   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) { *(.init.ramfs) }
 212   __initramfs_end = .;
 213 #endif
 214
 215 #ifdef CONFIG_SMP
 216   /*
 217    * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
 218    * output PHDR, so the next output section - __data_nosave - should
 219    * start another section data.init2.  Also, pda should be at the head of
 220    * percpu area.  Preallocate it and define the percpu offset symbol
 221    * so that it can be accessed as a percpu variable.
 222    */
 223   . = ALIGN(PAGE_SIZE);
 224   PERCPU_VADDR(0, :percpu)
 225 #else
 226   PERCPU(PAGE_SIZE)
 227 #endif
 228
 229   . = ALIGN(PAGE_SIZE);
 230   __init_end = .;
 231
 232   . = ALIGN(PAGE_SIZE);
 233   __nosave_begin = .;
 234   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 235       *(.data.nosave)
 236   } :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */
 237   . = ALIGN(PAGE_SIZE);
 238   __nosave_end = .;
 239
 240   __bss_start = .;              /* BSS */
 241   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 242         *(.bss.page_aligned)
 243         *(.bss)
 244         }
 245   __bss_stop = .;
 246
 247   _end = . ;
 248
 249   /* Sections to be discarded */
 250   /DISCARD/ : {
 251         *(.exitcall.exit)
 252         *(.eh_frame)
 253         }
 254
 255   STABS_DEBUG
 256
 257   DWARF_DEBUG
 258 }
 259
 260  /*
 261   * Per-cpu symbols which need to be offset from __per_cpu_load
 262   * for the boot processor.
 263   */
 264 #define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
 265 INIT_PER_CPU(gdt_page);
 266 INIT_PER_CPU(irq_stack_union);
 267
 268 /*
 269  * Build-time check on the image size:
 270  */
 271 ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
 272         "kernel image bigger than KERNEL_IMAGE_SIZE")
 273
 274 #ifdef CONFIG_SMP
 275 ASSERT((per_cpu__irq_stack_union == 0),
 276         "irq_stack_union is not at start of per-cpu area");
 277 #endif