root/arch/arm/boot/compressed/vmlinux.lds.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Copyright (C) 2000 Russell King
   4  */
   5 
   6 #ifdef CONFIG_CPU_ENDIAN_BE8
   7 #define ZIMAGE_MAGIC(x) ( (((x) >> 24) & 0x000000ff) | \
   8                           (((x) >>  8) & 0x0000ff00) | \
   9                           (((x) <<  8) & 0x00ff0000) | \
  10                           (((x) << 24) & 0xff000000) )
  11 #else
  12 #define ZIMAGE_MAGIC(x) (x)
  13 #endif
  14 
  15 OUTPUT_ARCH(arm)
  16 ENTRY(_start)
  17 SECTIONS
  18 {
  19   /DISCARD/ : {
  20     *(.ARM.exidx*)
  21     *(.ARM.extab*)
  22     /*
  23      * Discard any r/w data - this produces a link error if we have any,
  24      * which is required for PIC decompression.  Local data generates
  25      * GOTOFF relocations, which prevents it being relocated independently
  26      * of the text/got segments.
  27      */
  28     *(.data)
  29   }
  30 
  31   . = TEXT_START;
  32   _text = .;
  33 
  34   .text : {
  35     _start = .;
  36     *(.start)
  37     *(.text)
  38     *(.text.*)
  39     *(.fixup)
  40     *(.gnu.warning)
  41     *(.glue_7t)
  42     *(.glue_7)
  43   }
  44   .table : ALIGN(4) {
  45     _table_start = .;
  46     LONG(ZIMAGE_MAGIC(4))
  47     LONG(ZIMAGE_MAGIC(0x5a534c4b))
  48     LONG(ZIMAGE_MAGIC(__piggy_size_addr - _start))
  49     LONG(ZIMAGE_MAGIC(_kernel_bss_size))
  50     LONG(0)
  51     _table_end = .;
  52   }
  53   .rodata : {
  54     *(.rodata)
  55     *(.rodata.*)
  56     *(.data.rel.ro)
  57   }
  58   .piggydata : {
  59     *(.piggydata)
  60     __piggy_size_addr = . - 4;
  61   }
  62 
  63   . = ALIGN(4);
  64   _etext = .;
  65 
  66   .got.plt              : { *(.got.plt) }
  67   _got_start = .;
  68   .got                  : { *(.got) }
  69   _got_end = .;
  70 
  71   /* ensure the zImage file size is always a multiple of 64 bits */
  72   /* (without a dummy byte, ld just ignores the empty section) */
  73   .pad                  : { BYTE(0); . = ALIGN(8); }
  74 
  75 #ifdef CONFIG_EFI_STUB
  76   .data : ALIGN(4096) {
  77     __pecoff_data_start = .;
  78     /*
  79      * The EFI stub always executes from RAM, and runs strictly before the
  80      * decompressor, so we can make an exception for its r/w data, and keep it
  81      */
  82     *(.data.efistub)
  83     __pecoff_data_end = .;
  84 
  85     /*
  86      * PE/COFF mandates a file size which is a multiple of 512 bytes if the
  87      * section size equals or exceeds 4 KB
  88      */
  89     . = ALIGN(512);
  90   }
  91   __pecoff_data_rawsize = . - ADDR(.data);
  92 #endif
  93 
  94   _edata = .;
  95 
  96   /*
  97    * The image_end section appears after any additional loadable sections
  98    * that the linker may decide to insert in the binary image.  Having
  99    * this symbol allows further debug in the near future.
 100    */
 101   .image_end (NOLOAD) : {
 102     /*
 103      * EFI requires that the image is aligned to 512 bytes, and appended
 104      * DTB requires that we know where the end of the image is.  Ensure
 105      * that both are satisfied by ensuring that there are no additional
 106      * sections emitted into the decompressor image.
 107      */
 108     _edata_real = .;
 109   }
 110 
 111   _magic_sig = ZIMAGE_MAGIC(0x016f2818);
 112   _magic_start = ZIMAGE_MAGIC(_start);
 113   _magic_end = ZIMAGE_MAGIC(_edata);
 114   _magic_table = ZIMAGE_MAGIC(_table_start - _start);
 115 
 116   . = BSS_START;
 117   __bss_start = .;
 118   .bss                  : { *(.bss) }
 119   _end = .;
 120 
 121   . = ALIGN(8);         /* the stack must be 64-bit aligned */
 122   .stack                : { *(.stack) }
 123 
 124   PROVIDE(__pecoff_data_size = ALIGN(512) - ADDR(.data));
 125   PROVIDE(__pecoff_end = ALIGN(512));
 126 
 127   .stab 0               : { *(.stab) }
 128   .stabstr 0            : { *(.stabstr) }
 129   .stab.excl 0          : { *(.stab.excl) }
 130   .stab.exclstr 0       : { *(.stab.exclstr) }
 131   .stab.index 0         : { *(.stab.index) }
 132   .stab.indexstr 0      : { *(.stab.indexstr) }
 133   .comment 0            : { *(.comment) }
 134 }
 135 ASSERT(_edata_real == _edata, "error: zImage file size is incorrect");