linux/arch/x86/vdso/vdso32/int80.S
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   1/*
   2 * Code for the vDSO.  This version uses the old int $0x80 method.
   3 *
   4 * First get the common code for the sigreturn entry points.
   5 * This must come first.
   6 */
   7#include "sigreturn.S"
   8
   9        .text
  10        .globl __kernel_vsyscall
  11        .type __kernel_vsyscall,@function
  12        ALIGN
  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         * Pad out the segment to match the size of the sysenter.S version.
  52         */
  53VDSO32_vsyscall_eh_frame_size = 0x40
  54        .section .data,"aw",@progbits
  55        .space VDSO32_vsyscall_eh_frame_size-(.LENDFDEDLSI-.LSTARTFRAMEDLSI), 0
  56        .previous
  57
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