arch/i386/kernel/vsyscall-int80.S

   1 /*
   2  * Code for the vsyscall page.  This version uses the old int $0x80 method.
   3  *
   4  * NOTE:
   5  * 1) __kernel_vsyscall _must_ be first in this page.
   6  * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S
   7  *    for details.
   8  */
   9
  10         .text
  11         .globl __kernel_vsyscall
  12         .type __kernel_vsyscall,@function
  13 __kernel_vsyscall:
  14 .LSTART_vsyscall:
  15         int $0x80
  16         ret
  17 .LEND_vsyscall:
  18         .size __kernel_vsyscall,.-.LSTART_vsyscall
  19         .previous
  20
  21         .section .eh_frame,"a",@progbits
  22 .LSTARTFRAMEDLSI:
  23         .long .LENDCIEDLSI-.LSTARTCIEDLSI
  24 .LSTARTCIEDLSI:
  25         .long 0                 /* CIE ID */
  26         .byte 1                 /* Version number */
  27         .string "zR"            /* NUL-terminated augmentation string */
  28         .uleb128 1              /* Code alignment factor */
  29         .sleb128 -4             /* Data alignment factor */
  30         .byte 8                 /* Return address register column */
  31         .uleb128 1              /* Augmentation value length */
  32         .byte 0x1b              /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
  33         .byte 0x0c              /* DW_CFA_def_cfa */
  34         .uleb128 4
  35         .uleb128 4
  36         .byte 0x88              /* DW_CFA_offset, column 0x8 */
  37         .uleb128 1
  38         .align 4
  39 .LENDCIEDLSI:
  40         .long .LENDFDEDLSI-.LSTARTFDEDLSI /* Length FDE */
  41 .LSTARTFDEDLSI:
  42         .long .LSTARTFDEDLSI-.LSTARTFRAMEDLSI /* CIE pointer */
  43         .long .LSTART_vsyscall-.        /* PC-relative start address */
  44         .long .LEND_vsyscall-.LSTART_vsyscall
  45         .uleb128 0
  46         .align 4
  47 .LENDFDEDLSI:
  48         .previous
  49
  50 /*
  51  * Get the common code for the sigreturn entry points.
  52  */
  53 #include "vsyscall-sigreturn.S"