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

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/*
 * Linker script for 64-bit vDSO.
 * We #include the file to define the layout details.
 * Here we only choose the prelinked virtual address.
 *
 * This file defines the version script giving the user-exported symbols in
 * the DSO.  We can define local symbols here called VDSO* to make their
 * values visible using the asm-x86/vdso.h macros from the kernel proper.
 */

#define VDSO_PRELINK 0xffffffffff700000
#include "vdso-layout.lds.S"

/*
 * This controls what userland symbols we export from the vDSO.
 */
VERSION {
        LINUX_2.6 {
        global:
                clock_gettime;
                __vdso_clock_gettime;
                gettimeofday;
                __vdso_gettimeofday;
                getcpu;
                __vdso_getcpu;
        local: *;
        };
}

VDSO64_PRELINK = VDSO_PRELINK;

/*
 * Define VDSO64_x for each VEXTERN(x), for use via VDSO64_SYMBOL.
 */
#define VEXTERN(x)      VDSO64_ ## x = vdso_ ## x;
#include "vextern.h"
#undef  VEXTERN

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