arch/ia64/kernel/gate.lds.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linker script for gate DSO.  The gate pages are an ELF shared object
   4  * prelinked to its virtual address, with only one read-only segment and
   5  * one execute-only segment (both fit in one page).  This script controls
   6  * its layout.
   7  */
   8
   9 #include <asm/page.h>
  10
  11 SECTIONS
  12 {
  13         . = GATE_ADDR + SIZEOF_HEADERS;
  14
  15         .hash                   : { *(.hash) }          :readable
  16         .gnu.hash               : { *(.gnu.hash) }
  17         .dynsym                 : { *(.dynsym) }
  18         .dynstr                 : { *(.dynstr) }
  19         .gnu.version            : { *(.gnu.version) }
  20         .gnu.version_d          : { *(.gnu.version_d) }
  21         .gnu.version_r          : { *(.gnu.version_r) }
  22
  23         .note                   : { *(.note*) }         :readable       :note
  24
  25         .dynamic                : { *(.dynamic) }       :readable       :dynamic
  26
  27         /*
  28          * This linker script is used both with -r and with -shared.  For
  29          * the layouts to match, we need to skip more than enough space for
  30          * the dynamic symbol table et al.  If this amount is insufficient,
  31          * ld -shared will barf.  Just increase it here.
  32          */
  33         . = GATE_ADDR + 0x600;
  34
  35         .data..patch            : {
  36                 __start_gate_mckinley_e9_patchlist = .;
  37                 *(.data..patch.mckinley_e9)
  38                 __end_gate_mckinley_e9_patchlist = .;
  39
  40                 __start_gate_vtop_patchlist = .;
  41                 *(.data..patch.vtop)
  42                 __end_gate_vtop_patchlist = .;
  43
  44                 __start_gate_fsyscall_patchlist = .;
  45                 *(.data..patch.fsyscall_table)
  46                 __end_gate_fsyscall_patchlist = .;
  47
  48                 __start_gate_brl_fsys_bubble_down_patchlist = .;
  49                 *(.data..patch.brl_fsys_bubble_down)
  50                 __end_gate_brl_fsys_bubble_down_patchlist = .;
  51         }                                               :readable
  52
  53         .IA_64.unwind_info      : { *(.IA_64.unwind_info*) }
  54         .IA_64.unwind           : { *(.IA_64.unwind*) } :readable       :unwind
  55 #ifdef HAVE_BUGGY_SEGREL
  56         .text (GATE_ADDR + PAGE_SIZE) : { *(.text) *(.text.*) } :readable
  57 #else
  58         . = ALIGN(PERCPU_PAGE_SIZE) + (. & (PERCPU_PAGE_SIZE - 1));
  59         .text                   : { *(.text) *(.text.*) }       :epc
  60 #endif
  61
  62         /DISCARD/               : {
  63                 *(.got.plt) *(.got)
  64                 *(.data .data.* .gnu.linkonce.d.*)
  65                 *(.dynbss)
  66                 *(.bss .bss.* .gnu.linkonce.b.*)
  67                 *(__ex_table)
  68                 *(__mca_table)
  69         }
  70 }
  71
  72 /*
  73  * ld does not recognize this name token; use the constant.
  74  */
  75 #define PT_IA_64_UNWIND 0x70000001
  76
  77 /*
  78  * We must supply the ELF program headers explicitly to get just one
  79  * PT_LOAD segment, and set the flags explicitly to make segments read-only.
  80  */
  81 PHDRS
  82 {
  83         readable        PT_LOAD FILEHDR PHDRS   FLAGS(4);       /* PF_R */
  84 #ifndef HAVE_BUGGY_SEGREL
  85         epc             PT_LOAD FILEHDR PHDRS   FLAGS(1);       /* PF_X */
  86 #endif
  87         dynamic         PT_DYNAMIC              FLAGS(4);       /* PF_R */
  88         note            PT_NOTE                 FLAGS(4);       /* PF_R */
  89         unwind          PT_IA_64_UNWIND;
  90 }
  91
  92 /*
  93  * This controls what symbols we export from the DSO.
  94  */
  95 VERSION
  96 {
  97         LINUX_2.5 {
  98         global:
  99                 __kernel_syscall_via_break;
 100                 __kernel_syscall_via_epc;
 101                 __kernel_sigtramp;
 102
 103         local: *;
 104         };
 105 }
 106
 107 /* The ELF entry point can be used to set the AT_SYSINFO value.  */
 108 ENTRY(__kernel_syscall_via_epc)