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linux-vybrid_pu...
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arch
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i386
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kernel
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vsyscall-int80.S

vsyscall-int80.S 1.4 KB
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  1. /*
    2. 

  2.  * Code for the vsyscall page.  This version uses the old int $0x80 method.
    3. 

  3.  *
    4. 

  4.  * NOTE:
    5. 

  5.  * 1) __kernel_vsyscall _must_ be first in this page.
    6. 

  6.  * 2) there are alignment constraints on this stub, see vsyscall-sigreturn.S
    7. 

  7.  *    for details.
    8. 

  8.  */
    9. 

  9. 

  10. 	.text
    11. 

  11. 	.globl __kernel_vsyscall
    12. 

  12. 	.type __kernel_vsyscall,@function
    13. 

  13. __kernel_vsyscall:
    14. 

  14. .LSTART_vsyscall:
    15. 

  15. 	int $0x80
    16. 

  16. 	ret
    17. 

  17. .LEND_vsyscall:
    18. 

  18. 	.size __kernel_vsyscall,.-.LSTART_vsyscall
    19. 

  19. 	.previous
    20. 

  20. 

  21. 	.section .eh_frame,"a",@progbits
    22. 

  22. .LSTARTFRAMEDLSI:
    23. 

  23. 	.long .LENDCIEDLSI-.LSTARTCIEDLSI
    24. 

  24. .LSTARTCIEDLSI:
    25. 

  25. 	.long 0			/* CIE ID */
    26. 

  26. 	.byte 1			/* Version number */
    27. 

  27. 	.string "zR"		/* NUL-terminated augmentation string */
    28. 

  28. 	.uleb128 1		/* Code alignment factor */
    29. 

  29. 	.sleb128 -4		/* Data alignment factor */
    30. 

  30. 	.byte 8			/* Return address register column */
    31. 

  31. 	.uleb128 1		/* Augmentation value length */
    32. 

  32. 	.byte 0x1b		/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
    33. 

  33. 	.byte 0x0c		/* DW_CFA_def_cfa */
    34. 

  34. 	.uleb128 4
    35. 

  35. 	.uleb128 4
    36. 

  36. 	.byte 0x88		/* DW_CFA_offset, column 0x8 */
    37. 

  37. 	.uleb128 1
    38. 

  38. 	.align 4
    39. 

  39. .LENDCIEDLSI:
    40. 

  40. 	.long .LENDFDEDLSI-.LSTARTFDEDLSI /* Length FDE */
    41. 

  41. .LSTARTFDEDLSI:
    42. 

  42. 	.long .LSTARTFDEDLSI-.LSTARTFRAMEDLSI /* CIE pointer */
    43. 

  43. 	.long .LSTART_vsyscall-.	/* PC-relative start address */
    44. 

  44. 	.long .LEND_vsyscall-.LSTART_vsyscall
    45. 

  45. 	.uleb128 0
    46. 

  46. 	.align 4
    47. 

  47. .LENDFDEDLSI:
    48. 

  48. 	.previous
    49. 

  49. 

  50. /*
    51. 

  51.  * Get the common code for the sigreturn entry points.
    52. 

  52.  */
    53. 

  53. #include "vsyscall-sigreturn.S"
    54.