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_types.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 :  AT(ADDR(.text) - LOAD_OFFSET) {
  33         _text = .;                      /* Text and read-only data */
  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         _edata = .;                     /* End of data section */
  65         } :data
  66
  67
  68   .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) {
  69         . = ALIGN(PAGE_SIZE);
  70         . = ALIGN(CONFIG_X86_L1_CACHE_BYTES);
  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   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 129         . = ALIGN(THREAD_SIZE); /* init_task */
 130         *(.data.init_task)
 131   }:data.init
 132
 133   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
 134         . = ALIGN(PAGE_SIZE);
 135         *(.data.page_aligned)
 136   }
 137
 138   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
 139         /* might get freed after init */
 140         . = ALIGN(PAGE_SIZE);
 141         __smp_alt_begin = .;
 142         __smp_locks = .;
 143         *(.smp_locks)
 144         __smp_locks_end = .;
 145         . = ALIGN(PAGE_SIZE);
 146         __smp_alt_end = .;
 147   }
 148
 149   . = ALIGN(PAGE_SIZE);         /* Init code and data */
 150   __init_begin = .;     /* paired with __init_end */
 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   .init.setup : AT(ADDR(.init.setup) - LOAD_OFFSET) {
 163         . = ALIGN(16);
 164         __setup_start = .;
 165         *(.init.setup)
 166         __setup_end = .;
 167   }
 168   .initcall.init : AT(ADDR(.initcall.init) - LOAD_OFFSET) {
 169         __initcall_start = .;
 170         INITCALLS
 171         __initcall_end = .;
 172   }
 173   .con_initcall.init : AT(ADDR(.con_initcall.init) - LOAD_OFFSET) {
 174         __con_initcall_start = .;
 175         *(.con_initcall.init)
 176         __con_initcall_end = .;
 177   }
 178   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
 179         __x86_cpu_dev_start = .;
 180         *(.x86_cpu_dev.init)
 181         __x86_cpu_dev_end = .;
 182   }
 183   SECURITY_INIT
 184
 185   . = ALIGN(8);
 186   .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
 187         __parainstructions = .;
 188        *(.parainstructions)
 189         __parainstructions_end = .;
 190   }
 191
 192   .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
 193         . = ALIGN(8);
 194         __alt_instructions = .;
 195         *(.altinstructions)
 196         __alt_instructions_end = .;
 197   }
 198   .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
 199         *(.altinstr_replacement)
 200   }
 201   /* .exit.text is discard at runtime, not link time, to deal with references
 202      from .altinstructions and .eh_frame */
 203   .exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
 204         EXIT_TEXT
 205   }
 206   .exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
 207         EXIT_DATA
 208   }
 209
 210 #ifdef CONFIG_BLK_DEV_INITRD
 211   . = ALIGN(PAGE_SIZE);
 212   .init.ramfs : AT(ADDR(.init.ramfs) - LOAD_OFFSET) {
 213         __initramfs_start = .;
 214         *(.init.ramfs)
 215         __initramfs_end = .;
 216   }
 217 #endif
 218
 219 #ifdef CONFIG_SMP
 220   /*
 221    * percpu offsets are zero-based on SMP.  PERCPU_VADDR() changes the
 222    * output PHDR, so the next output section - __data_nosave - should
 223    * start another section data.init2.  Also, pda should be at the head of
 224    * percpu area.  Preallocate it and define the percpu offset symbol
 225    * so that it can be accessed as a percpu variable.
 226    */
 227   . = ALIGN(PAGE_SIZE);
 228   PERCPU_VADDR(0, :percpu)
 229 #else
 230   PERCPU(PAGE_SIZE)
 231 #endif
 232
 233   . = ALIGN(PAGE_SIZE);
 234   __init_end = .;
 235
 236   .data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
 237         . = ALIGN(PAGE_SIZE);
 238         __nosave_begin = .;
 239         *(.data.nosave)
 240         . = ALIGN(PAGE_SIZE);
 241         __nosave_end = .;
 242   } :data.init2 /* use another section data.init2, see PERCPU_VADDR() above */
 243
 244   .bss : AT(ADDR(.bss) - LOAD_OFFSET) {
 245         . = ALIGN(PAGE_SIZE);
 246         __bss_start = .;                /* BSS */
 247         *(.bss.page_aligned)
 248         *(.bss)
 249         __bss_stop = .;
 250   }
 251
 252   .brk : AT(ADDR(.brk) - LOAD_OFFSET) {
 253         . = ALIGN(PAGE_SIZE);
 254         __brk_base = . ;
 255         . += 64 * 1024 ;        /* 64k alignment slop space */
 256         *(.brk_reservation)     /* areas brk users have reserved */
 257         __brk_limit = . ;
 258   }
 259
 260   _end = . ;
 261
 262   /* Sections to be discarded */
 263   /DISCARD/ : {
 264         *(.exitcall.exit)
 265         *(.eh_frame)
 266         *(.discard)
 267         }
 268
 269   STABS_DEBUG
 270
 271   DWARF_DEBUG
 272 }
 273
 274  /*
 275   * Per-cpu symbols which need to be offset from __per_cpu_load
 276   * for the boot processor.
 277   */
 278 #define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
 279 INIT_PER_CPU(gdt_page);
 280 INIT_PER_CPU(irq_stack_union);
 281
 282 /*
 283  * Build-time check on the image size:
 284  */
 285 ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
 286         "kernel image bigger than KERNEL_IMAGE_SIZE")
 287
 288 #ifdef CONFIG_SMP
 289 ASSERT((per_cpu__irq_stack_union == 0),
 290         "irq_stack_union is not at start of per-cpu area");
 291 #endif
 292
 293 #ifdef CONFIG_KEXEC
 294 #include <asm/kexec.h>
 295
 296 ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
 297        "kexec control code size is too big")
 298 #endif