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vsyscall-syscall.S

vsyscall-syscall.S 1.8 KB
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  1. /*
    2. 

  2.  * Code for the vsyscall page.  This version uses the syscall instruction.
    3. 

  3.  */
    4. 

  4. 

  5. #include <asm/ia32_unistd.h>
    6. 

  6. #include <asm/offset.h>
    7. 

  7. #include <asm/segment.h>
    8. 

  8. 

  9. 	.text
    10. 

  10. 	.section .text.vsyscall,"ax"
    11. 

  11. 	.globl __kernel_vsyscall
    12. 

  12. 	.type __kernel_vsyscall,@function
    13. 

  13. __kernel_vsyscall:
    14. 

  14. .LSTART_vsyscall:
    15. 

  15. 	push	%ebp
    16. 

  16. .Lpush_ebp:
    17. 

  17. 	movl	%ecx, %ebp
    18. 

  18. 	syscall
    19. 

  19. 	movl	$__USER32_DS, %ecx
    20. 

  20. 	movl	%ecx, %ss
    21. 

  21. 	movl	%ebp, %ecx
    22. 

  22. 	popl	%ebp
    23. 

  23. .Lpop_ebp:
    24. 

  24. 	ret
    25. 

  25. .LEND_vsyscall:
    26. 

  26. 	.size __kernel_vsyscall,.-.LSTART_vsyscall
    27. 

  27. 

  28. 	.section .eh_frame,"a",@progbits
    29. 

  29. .LSTARTFRAME:
    30. 

  30. 	.long .LENDCIE-.LSTARTCIE
    31. 

  31. .LSTARTCIE:
    32. 

  32. 	.long 0			/* CIE ID */
    33. 

  33. 	.byte 1			/* Version number */
    34. 

  34. 	.string "zR"		/* NUL-terminated augmentation string */
    35. 

  35. 	.uleb128 1		/* Code alignment factor */
    36. 

  36. 	.sleb128 -4		/* Data alignment factor */
    37. 

  37. 	.byte 8			/* Return address register column */
    38. 

  38. 	.uleb128 1		/* Augmentation value length */
    39. 

  39. 	.byte 0x1b		/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
    40. 

  40. 	.byte 0x0c		/* DW_CFA_def_cfa */
    41. 

  41. 	.uleb128 4
    42. 

  42. 	.uleb128 4
    43. 

  43. 	.byte 0x88		/* DW_CFA_offset, column 0x8 */
    44. 

  44. 	.uleb128 1
    45. 

  45. 	.align 4
    46. 

  46. .LENDCIE:
    47. 

  47. 

  48. 	.long .LENDFDE1-.LSTARTFDE1	/* Length FDE */
    49. 

  49. .LSTARTFDE1:
    50. 

  50. 	.long .LSTARTFDE1-.LSTARTFRAME	/* CIE pointer */
    51. 

  51. 	.long .LSTART_vsyscall-.	/* PC-relative start address */
    52. 

  52. 	.long .LEND_vsyscall-.LSTART_vsyscall
    53. 

  53. 	.uleb128 0			/* Augmentation length */
    54. 

  54. 	/* What follows are the instructions for the table generation.
    55. 

  55. 	   We have to record all changes of the stack pointer.  */
    56. 

  56. 	.byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
    57. 

  57. 	.byte 0x0e		/* DW_CFA_def_cfa_offset */
    58. 

  58. 	.uleb128 8
    59. 

  59. 	.byte 0x85, 0x02	/* DW_CFA_offset %ebp -8 */
    60. 

  60. 	.byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
    61. 

  61. 	.byte 0xc5		/* DW_CFA_restore %ebp */
    62. 

  62. 	.byte 0x0e		/* DW_CFA_def_cfa_offset */
    63. 

  63. 	.uleb128 4
    64. 

  64. 	.align 4
    65. 

  65. .LENDFDE1:
    66. 

  66. 

  67. #define SYSCALL_ENTER_KERNEL	syscall
    68. 

  68. #include "vsyscall-sigreturn.S"
    69.