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root/arch/x86/vdso/vdso-layout.lds.S

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/*
 * Linker script for vDSO.  This is an ELF shared object prelinked to
 * its virtual address, and with only one read-only segment.
 * This script controls its layout.
 */

SECTIONS
{
        . = VDSO_PRELINK + SIZEOF_HEADERS;

        .hash           : { *(.hash) }                  :text
        .gnu.hash       : { *(.gnu.hash) }
        .dynsym         : { *(.dynsym) }
        .dynstr         : { *(.dynstr) }
        .gnu.version    : { *(.gnu.version) }
        .gnu.version_d  : { *(.gnu.version_d) }
        .gnu.version_r  : { *(.gnu.version_r) }

        .note           : { *(.note.*) }                :text   :note

        .eh_frame_hdr   : { *(.eh_frame_hdr) }          :text   :eh_frame_hdr
        .eh_frame       : { KEEP (*(.eh_frame)) }       :text

        .dynamic        : { *(.dynamic) }               :text   :dynamic

        .rodata         : { *(.rodata*) }               :text
        .data           : {
              *(.data*)
              *(.sdata*)
              *(.got.plt) *(.got)
              *(.gnu.linkonce.d.*)
              *(.bss*)
              *(.dynbss*)
              *(.gnu.linkonce.b.*)
        }

        .altinstructions        : { *(.altinstructions) }
        .altinstr_replacement   : { *(.altinstr_replacement) }

        /*
         * Align the actual code well away from the non-instruction data.
         * This is the best thing for the I-cache.
         */
        . = ALIGN(0x100);

        .text           : { *(.text*) }                 :text   =0x90909090
}

/*
 * Very old versions of ld do not recognize this name token; use the constant.
 */
#define PT_GNU_EH_FRAME 0x6474e550

/*
 * We must supply the ELF program headers explicitly to get just one
 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
 */
PHDRS
{
        text            PT_LOAD         FLAGS(5) FILEHDR PHDRS; /* PF_R|PF_X */
        dynamic         PT_DYNAMIC      FLAGS(4);               /* PF_R */
        note            PT_NOTE         FLAGS(4);               /* PF_R */
        eh_frame_hdr    PT_GNU_EH_FRAME;
}

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