/*
 * 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.
 */

#if defined(BUILD_VDSO64)
# define SHDR_SIZE 64
#elif defined(BUILD_VDSO32)
# define SHDR_SIZE 40
#else
# error unknown VDSO target
#endif

#define NUM_FAKE_SHDRS 7

SECTIONS
{
        /*
         * User/kernel shared data is before the vDSO.  This may be a little
         * uglier than putting it after the vDSO, but it avoids issues with
         * non-allocatable things that dangle past the end of the PT_LOAD
         * segment. Page size is 8192 for both 64-bit and 32-bit vdso binaries
         */

        vvar_start = . -8192;
        vvar_data = vvar_start;

        . = 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) }

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

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

                /*
                 * Ideally this would live in a C file: kept in here for
                 * compatibility with x86-64.
                 */
                VDSO_FAKE_SECTION_TABLE_START = .;
                . = . + NUM_FAKE_SHDRS * SHDR_SIZE;
                VDSO_FAKE_SECTION_TABLE_END = .;
        }                                               :text

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


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

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


        /*
         * Text is well-separated from actual data: there's plenty of
         * stuff that isn't used at runtime in between.
         */

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

        /DISCARD/ : {
                *(.discard)
                *(.discard.*)
                *(__bug_table)
        }
}

/*
 * 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;
}