arch/arm64/kernel/vmlinux.lds.S

   1 /*
   2  * ld script to make ARM Linux kernel
   3  * taken from the i386 version by Russell King
   4  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   5  */
   6
   7 #include <asm-generic/vmlinux.lds.h>
   8 #include <asm/thread_info.h>
   9 #include <asm/memory.h>
  10 #include <asm/page.h>
  11 #include <asm/pgtable.h>
  12
  13 #include "image.h"
  14
  15 /* .exit.text needed in case of alternative patching */
  16 #define ARM_EXIT_KEEP(x)        x
  17 #define ARM_EXIT_DISCARD(x)
  18
  19 OUTPUT_ARCH(aarch64)
  20 ENTRY(_text)
  21
  22 jiffies = jiffies_64;
  23
  24 #define HYPERVISOR_TEXT                                 \
  25         /*                                              \
  26          * Align to 4 KB so that                        \
  27          * a) the HYP vector table is at its minimum    \
  28          *    alignment of 2048 bytes                   \
  29          * b) the HYP init code will not cross a page   \
  30          *    boundary if its size does not exceed      \
  31          *    4 KB (see related ASSERT() below)         \
  32          */                                             \
  33         . = ALIGN(SZ_4K);                               \
  34         VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;     \
  35         *(.hyp.idmap.text)                              \
  36         VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;       \
  37         VMLINUX_SYMBOL(__hyp_text_start) = .;           \
  38         *(.hyp.text)                                    \
  39         VMLINUX_SYMBOL(__hyp_text_end) = .;
  40
  41 #define IDMAP_TEXT                                      \
  42         . = ALIGN(SZ_4K);                               \
  43         VMLINUX_SYMBOL(__idmap_text_start) = .;         \
  44         *(.idmap.text)                                  \
  45         VMLINUX_SYMBOL(__idmap_text_end) = .;
  46
  47 /*
  48  * The size of the PE/COFF section that covers the kernel image, which
  49  * runs from stext to _edata, must be a round multiple of the PE/COFF
  50  * FileAlignment, which we set to its minimum value of 0x200. 'stext'
  51  * itself is 4 KB aligned, so padding out _edata to a 0x200 aligned
  52  * boundary should be sufficient.
  53  */
  54 PECOFF_FILE_ALIGNMENT = 0x200;
  55
  56 #ifdef CONFIG_EFI
  57 #define PECOFF_EDATA_PADDING    \
  58         .pecoff_edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGNMENT); }
  59 #else
  60 #define PECOFF_EDATA_PADDING
  61 #endif
  62
  63 #ifdef CONFIG_DEBUG_ALIGN_RODATA
  64 #define ALIGN_DEBUG_RO                  . = ALIGN(1<<SECTION_SHIFT);
  65 #define ALIGN_DEBUG_RO_MIN(min)         ALIGN_DEBUG_RO
  66 #else
  67 #define ALIGN_DEBUG_RO
  68 #define ALIGN_DEBUG_RO_MIN(min)         . = ALIGN(min);
  69 #endif
  70
  71 SECTIONS
  72 {
  73         /*
  74          * XXX: The linker does not define how output sections are
  75          * assigned to input sections when there are multiple statements
  76          * matching the same input section name.  There is no documented
  77          * order of matching.
  78          */
  79         /DISCARD/ : {
  80                 ARM_EXIT_DISCARD(EXIT_TEXT)
  81                 ARM_EXIT_DISCARD(EXIT_DATA)
  82                 EXIT_CALL
  83                 *(.discard)
  84                 *(.discard.*)
  85         }
  86
  87         . = PAGE_OFFSET + TEXT_OFFSET;
  88
  89         .head.text : {
  90                 _text = .;
  91                 HEAD_TEXT
  92         }
  93         ALIGN_DEBUG_RO
  94         .text : {                       /* Real text segment            */
  95                 _stext = .;             /* Text and read-only data      */
  96                         __exception_text_start = .;
  97                         *(.exception.text)
  98                         __exception_text_end = .;
  99                         IRQENTRY_TEXT
 100                         TEXT_TEXT
 101                         SCHED_TEXT
 102                         LOCK_TEXT
 103                         HYPERVISOR_TEXT
 104                         IDMAP_TEXT
 105                         *(.fixup)
 106                         *(.gnu.warning)
 107                 . = ALIGN(16);
 108                 *(.got)                 /* Global offset table          */
 109         }
 110
 111         ALIGN_DEBUG_RO
 112         RO_DATA(PAGE_SIZE)
 113         EXCEPTION_TABLE(8)
 114         NOTES
 115         ALIGN_DEBUG_RO
 116         _etext = .;                     /* End of text and rodata section */
 117
 118         ALIGN_DEBUG_RO_MIN(PAGE_SIZE)
 119         __init_begin = .;
 120
 121         INIT_TEXT_SECTION(8)
 122         .exit.text : {
 123                 ARM_EXIT_KEEP(EXIT_TEXT)
 124         }
 125
 126         ALIGN_DEBUG_RO_MIN(16)
 127         .init.data : {
 128                 INIT_DATA
 129                 INIT_SETUP(16)
 130                 INIT_CALLS
 131                 CON_INITCALL
 132                 SECURITY_INITCALL
 133                 INIT_RAM_FS
 134         }
 135         .exit.data : {
 136                 ARM_EXIT_KEEP(EXIT_DATA)
 137         }
 138
 139         PERCPU_SECTION(64)
 140
 141         . = ALIGN(PAGE_SIZE);
 142         __init_end = .;
 143
 144         . = ALIGN(4);
 145         .altinstructions : {
 146                 __alt_instructions = .;
 147                 *(.altinstructions)
 148                 __alt_instructions_end = .;
 149         }
 150         .altinstr_replacement : {
 151                 *(.altinstr_replacement)
 152         }
 153
 154         . = ALIGN(PAGE_SIZE);
 155         _data = .;
 156         _sdata = .;
 157         RW_DATA_SECTION(64, PAGE_SIZE, THREAD_SIZE)
 158         PECOFF_EDATA_PADDING
 159         _edata = .;
 160
 161         BSS_SECTION(0, 0, 0)
 162
 163         . = ALIGN(PAGE_SIZE);
 164         idmap_pg_dir = .;
 165         . += IDMAP_DIR_SIZE;
 166         swapper_pg_dir = .;
 167         . += SWAPPER_DIR_SIZE;
 168
 169         _end = .;
 170
 171         STABS_DEBUG
 172
 173         HEAD_SYMBOLS
 174 }
 175
 176 /*
 177  * The HYP init code and ID map text can't be longer than a page each,
 178  * and should not cross a page boundary.
 179  */
 180 ASSERT(__hyp_idmap_text_end - (__hyp_idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
 181         "HYP init code too big or misaligned")
 182 ASSERT(__idmap_text_end - (__idmap_text_start & ~(SZ_4K - 1)) <= SZ_4K,
 183         "ID map text too big or misaligned")
 184
 185 /*
 186  * If padding is applied before .head.text, virt<->phys conversions will fail.
 187  */
 188 ASSERT(_text == (PAGE_OFFSET + TEXT_OFFSET), "HEAD is misaligned")