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fenva.S

fenva.S 1.5 KB
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  1. /*++
    2. 

  2. 

  3. Copyright (c) 2015 Minoca Corp.
    4. 

  4. 

  5.     This file is licensed under the terms of the GNU General Public License
    6. 

  6.     version 3. Alternative licensing terms are available. Contact
    7. 

  7.     info@minocacorp.com for details. See the LICENSE file at the root of this
    8. 

  8.     project for complete licensing information.
    9. 

  9. 

  10. Module Name:
    11. 

  11. 

  12.     fenva.S
    13. 

  13. 

  14. Abstract:
    15. 

  15. 

  16.     This module implements assembly support functionality for ARM floating
    17. 

  17.     point (VFP).
    18. 

  18. 

  19. Author:
    20. 

  20. 

  21.     Evan Green 11-Nov-2015
    22. 

  22. 

  23. Environment:
    24. 

  24. 

  25.     User Mode C Library
    26. 

  26. 

  27. --*/
    28. 

  28. 

  29. //
    30. 

  30. // ------------------------------------------------------------------- Includes
    31. 

  31. //
    32. 

  32. 

  33. #include <minoca/kernel/arm.inc>
    34. 

  34. 

  35. //
    36. 

  36. // ---------------------------------------------------------------- Definitions
    37. 

  37. //
    38. 

  38. 

  39. //
    40. 

  40. // ----------------------------------------------------------------------- Code
    41. 

  41. //
    42. 

  42. 

  43. ASSEMBLY_FILE_HEADER
    44. 

  44. .fpu vfpv3
    45. 

  45. 

  46. //
    47. 

  47. // unsigned int
    48. 

  48. // ClpGetFpscr (
    49. 

  49. //     void
    50. 

  50. //     )
    51. 

  51. //
    52. 

  52. 

  53. /*++
    54. 

  54. 

  55. Routine Description:
    56. 

  56. 

  57.     This routine returns the VFP floating point status and control register
    58. 

  58.     (FPSCR).
    59. 

  59. 

  60. Arguments:
    61. 

  61. 

  62.     None.
    63. 

  63. 

  64. Return Value:
    65. 

  65. 

  66.     Returns the FPSCR.
    67. 

  67. 

  68. --*/
    69. 

  69. 

  70. FUNCTION ClpGetFpscr
    71. 

  71.     vmrs    %r0, FPSCR
    72. 

  72.     bx      %lr
    73. 

  73. 

  74. END_FUNCTION ClpGetFpscr
    75. 

  75. 

  76. //
    77. 

  77. // void
    78. 

  78. // ClpSetFpscr (
    79. 

  79. //     unsigned int Value
    80. 

  80. //     )
    81. 

  81. //
    82. 

  82. 

  83. /*++
    84. 

  84. 

  85. Routine Description:
    86. 

  86. 

  87.     This routine sets the VFP floating point status and control register
    88. 

  88.     (FPSCR).
    89. 

  89. 

  90. Arguments:
    91. 

  91. 

  92.     Value - Supplies the new value to set.
    93. 

  93. 

  94. Return Value:
    95. 

  95. 

  96.     None.
    97. 

  97. 

  98. --*/
    99. 

  99. 

  100. FUNCTION ClpSetFpscr
    101. 

  101.     vmsr    FPSCR, %r0
    102. 

  102.     bx      %lr
    103. 

  103. 

  104. END_FUNCTION ClpSetFpscr
    105. 

  105.