arch/ia64/kernel/gate.lds.S

   1 /*
   2  * Linker script for gate DSO.  The gate pages are an ELF shared object prelinked to its
   3  * virtual address, with only one read-only segment and one execute-only segment (both fit
   4  * in one page).  This script controls its layout.
   5  */
   6
   7 #include <linux/config.h>
   8
   9 #include <asm/system.h>
  10
  11 SECTIONS
  12 {
  13   . = GATE_ADDR + SIZEOF_HEADERS;
  14
  15   .hash                         : { *(.hash) }                          :readable
  16   .dynsym                       : { *(.dynsym) }
  17   .dynstr                       : { *(.dynstr) }
  18   .gnu.version                  : { *(.gnu.version) }
  19   .gnu.version_d                : { *(.gnu.version_d) }
  20   .gnu.version_r                : { *(.gnu.version_r) }
  21   .dynamic                      : { *(.dynamic) }                       :readable :dynamic
  22
  23   /*
  24    * This linker script is used both with -r and with -shared.  For the layouts to match,
  25    * we need to skip more than enough space for the dynamic symbol table et al.  If this
  26    * amount is insufficient, ld -shared will barf.  Just increase it here.
  27    */
  28   . = GATE_ADDR + 0x500;
  29
  30   .data.patch                   : {
  31                                     __start_gate_mckinley_e9_patchlist = .;
  32                                     *(.data.patch.mckinley_e9)
  33                                     __end_gate_mckinley_e9_patchlist = .;
  34
  35                                     __start_gate_vtop_patchlist = .;
  36                                     *(.data.patch.vtop)
  37                                     __end_gate_vtop_patchlist = .;
  38
  39                                     __start_gate_fsyscall_patchlist = .;
  40                                     *(.data.patch.fsyscall_table)
  41                                     __end_gate_fsyscall_patchlist = .;
  42
  43                                     __start_gate_brl_fsys_bubble_down_patchlist = .;
  44                                     *(.data.patch.brl_fsys_bubble_down)
  45                                     __end_gate_brl_fsys_bubble_down_patchlist = .;
  46   }                                                                     :readable
  47   .IA_64.unwind_info            : { *(.IA_64.unwind_info*) }
  48   .IA_64.unwind                 : { *(.IA_64.unwind*) }                 :readable :unwind
  49 #ifdef HAVE_BUGGY_SEGREL
  50   .text (GATE_ADDR + PAGE_SIZE) : { *(.text) *(.text.*) }               :readable
  51 #else
  52   . = ALIGN (PERCPU_PAGE_SIZE) + (. & (PERCPU_PAGE_SIZE - 1));
  53   .text                         : { *(.text) *(.text.*) }               :epc
  54 #endif
  55
  56   /DISCARD/                     : {
  57         *(.got.plt) *(.got)
  58         *(.data .data.* .gnu.linkonce.d.*)
  59         *(.dynbss)
  60         *(.bss .bss.* .gnu.linkonce.b.*)
  61         *(__ex_table)
  62   }
  63 }
  64
  65 /*
  66  * We must supply the ELF program headers explicitly to get just one
  67  * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  68  */
  69 PHDRS
  70 {
  71   readable  PT_LOAD     FILEHDR PHDRS   FLAGS(4);       /* PF_R */
  72 #ifndef HAVE_BUGGY_SEGREL
  73   epc       PT_LOAD     FILEHDR PHDRS   FLAGS(1);       /* PF_X */
  74 #endif
  75   dynamic   PT_DYNAMIC                  FLAGS(4);       /* PF_R */
  76   unwind    0x70000001; /* PT_IA_64_UNWIND, but ld doesn't match the name */
  77 }
  78
  79 /*
  80  * This controls what symbols we export from the DSO.
  81  */
  82 VERSION
  83 {
  84   LINUX_2.5 {
  85     global:
  86         __kernel_syscall_via_break;
  87         __kernel_syscall_via_epc;
  88         __kernel_sigtramp;
  89
  90     local: *;
  91   };
  92 }
  93
  94 /* The ELF entry point can be used to set the AT_SYSINFO value.  */
  95 ENTRY(__kernel_syscall_via_epc)