x86_64: move vdso

[sfrench/cifs-2.6.git] / arch / x86 / vdso / vdso.lds.S

diff --git a/arch/x86/vdso/vdso.lds.S b/arch/x86/vdso/vdso.lds.S
new file mode 100644 (file)
index 0000000..b9a60e6
--- /dev/null
+++ b/arch/x86/vdso/vdso.lds.S
@@ -0,0 +1,77 @@
+/*
+ * Linker script for vsyscall DSO.  The vsyscall page is an ELF shared
+ * object prelinked to its virtual address, and with only one read-only
+ * segment (that fits in one page).  This script controls its layout.
+ */
+#include <asm/asm-offsets.h>
+#include "voffset.h"
+
+#define VDSO_PRELINK 0xffffffffff700000
+
+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) }
+
+  /* This linker script is used both with -r and with -shared.
+     For the layouts to match, we need to skip more than enough
+     space for the dynamic symbol table et al.  If this amount
+     is insufficient, ld -shared will barf.  Just increase it here.  */
+  . = VDSO_PRELINK + VDSO_TEXT_OFFSET;
+
+  .text           : { *(.text) }               :text
+  .text.ptr       : { *(.text.ptr) }           :text
+  . = VDSO_PRELINK + 0x900;
+  .data           : { *(.data) }               :text
+  .bss            : { *(.bss) }                        :text
+
+  .altinstructions : { *(.altinstructions) }                   :text
+  .altinstr_replacement  : { *(.altinstr_replacement) }        :text
+
+  .note                  : { *(.note.*) }              :text :note
+  .eh_frame_hdr   : { *(.eh_frame_hdr) }       :text :eh_frame_hdr
+  .eh_frame       : { KEEP (*(.eh_frame)) }    :text
+  .dynamic        : { *(.dynamic) }            :text :dynamic
+  .useless        : {
+       *(.got.plt) *(.got)
+       *(.gnu.linkonce.d.*)
+       *(.dynbss)
+       *(.gnu.linkonce.b.*)
+  }                                            :text
+}
+
+/*
+ * 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 FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
+  dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
+  note PT_NOTE FLAGS(4); /* PF_R */
+  eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */
+}
+
+/*
+ * This controls what symbols we export from the DSO.
+ */
+VERSION
+{
+  LINUX_2.6 {
+    global:
+       clock_gettime;
+       __vdso_clock_gettime;
+       gettimeofday;
+       __vdso_gettimeofday;
+       getcpu;
+       __vdso_getcpu;
+    local: *;
+  };
+}