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sclow.S

sclow.S 1.9 KB
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  1. /* sclow.S: Low level special syscall handling.
    2. 

  2.  *          Basically these are cases where we can completely
    3. 

  3.  *          handle the system call without saving any state
    4. 

  4.  *          because we know that the process will not sleep.
    5. 

  5.  *
    6. 

  6.  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
    7. 

  7.  */
    8. 

  8. 

  9. #include <asm/ptrace.h>
    10. 

  10. #include <asm/asm_offsets.h>
    11. 

  11. #include <asm/errno.h>
    12. 

  12. #include <asm/winmacro.h>
    13. 

  13. #include <asm/thread_info.h>
    14. 

  14. #include <asm/psr.h>
    15. 

  15. #include <asm/page.h>
    16. 

  16. 

  17. #define CC_AND_RETT  \
    18. 

  18. 	set	PSR_C, %l4; \
    19. 

  19. 	andn	%l0, %l4, %l4; \
    20. 

  20. 	wr	%l4, 0x0, %psr; \
    21. 

  21. 	nop; nop; nop; \
    22. 

  22. 	jmp	%l2; \
    23. 

  23. 	rett	%l2 + 4;
    24. 

  24. 

  25. #define SC_AND_RETT  \
    26. 

  26. 	set	PSR_C, %l4; \
    27. 

  27. 	or	%l0, %l4, %l4; \
    28. 

  28. 	wr	%l4, 0x0, %psr; \
    29. 

  29. 	nop; nop; nop; \
    30. 

  30. 	jmp	%l2; \
    31. 

  31. 	rett	%l2 + 4;
    32. 

  32. 

  33. #define LABEL(func)  func##_low
    34. 

  34. 

  35. 	.globl	LABEL(sunosnop)
    36. 

  36. LABEL(sunosnop):
    37. 

  37. 	CC_AND_RETT
    38. 

  38. 

  39. #if (ASIZ_task_uid == 2 && ASIZ_task_euid == 2)
    40. 

  40. 	.globl	LABEL(sunosgetuid)
    41. 

  41. LABEL(sunosgetuid):
    42. 

  42. 	LOAD_CURRENT(l4, l5)
    43. 

  43. 	ld	[%l4 + TI_TASK], %l4
    44. 

  44. 	lduh	[%l4 + AOFF_task_uid], %i0
    45. 

  45. 	lduh	[%l4 + AOFF_task_euid], %i1
    46. 

  46. 	CC_AND_RETT
    47. 

  47. #endif
    48. 

  48. 

  49. #if (ASIZ_task_gid == 2 && ASIZ_task_egid == 2)
    50. 

  50. 	.globl	LABEL(sunosgetgid)
    51. 

  51. LABEL(sunosgetgid):
    52. 

  52. 	LOAD_CURRENT(l4, l5)
    53. 

  53. 	ld	[%l4 + TI_TASK], %l4
    54. 

  54. 	lduh	[%l4 + AOFF_task_gid], %i0
    55. 

  55. 	lduh	[%l4 + AOFF_task_egid], %i1
    56. 

  56. 	CC_AND_RETT
    57. 

  57. #endif
    58. 

  58. 

  59. 	.globl	LABEL(sunosmctl)
    60. 

  60. LABEL(sunosmctl):
    61. 

  61. 	mov	0, %i0
    62. 

  62. 	CC_AND_RETT
    63. 

  63. 

  64. 	.globl	LABEL(sunosgdtsize)
    65. 

  65. LABEL(sunosgdtsize):	
    66. 

  66. 	mov	256, %i0
    67. 

  67. 	CC_AND_RETT
    68. 

  68. 

  69. 	.globl	LABEL(getpagesize)
    70. 

  70. LABEL(getpagesize):
    71. 

  71. 	set	PAGE_SIZE, %i0
    72. 

  72. 	CC_AND_RETT
    73. 

  73. 

  74. 	/* XXX sys_nice() XXX */
    75. 

  75. 	/* XXX sys_setpriority() XXX */
    76. 

  76. 	/* XXX sys_getpriority() XXX */
    77. 

  77. 	/* XXX sys_setregid() XXX */
    78. 

  78. 	/* XXX sys_setgid() XXX */
    79. 

  79. 	/* XXX sys_setreuid() XXX */
    80. 

  80. 	/* XXX sys_setuid() XXX */
    81. 

  81. 	/* XXX sys_setfsuid() XXX */
    82. 

  82. 	/* XXX sys_setfsgid() XXX */
    83. 

  83. 	/* XXX sys_setpgid() XXX */
    84. 

  84. 	/* XXX sys_getpgid() XXX */
    85. 

  85. 	/* XXX sys_setsid() XXX */
    86. 

  86. 	/* XXX sys_getsid() XXX */
    87.