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monkey2
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modules
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std
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fiber
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native
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asm
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make_arm64_aapcs_elf_gas.S

make_arm64_aapcs_elf_gas.S 3.6 KB
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  1. /*
    2. 

  2.             Copyright Edward Nevill + Oliver Kowalke 2015
    3. 

  3.    Distributed under the Boost Software License, Version 1.0.
    4. 

  4.       (See accompanying file LICENSE_1_0.txt or copy at
    5. 

  5.           http://www.boost.org/LICENSE_1_0.txt)
    6. 

  6. */
    7. 

  7. /*******************************************************
    8. 

  8.  *                                                     *
    9. 

  9.  *  -------------------------------------------------  *
    10. 

  10.  *  |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  *
    11. 

  11.  *  -------------------------------------------------  *
    12. 

  12.  *  | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c|  *
    13. 

  13.  *  -------------------------------------------------  *
    14. 

  14.  *  |    d8     |    d9     |    d10    |    d11    |  *
    15. 

  15.  *  -------------------------------------------------  *
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  16.  *  -------------------------------------------------  *
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  17.  *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
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  18.  *  -------------------------------------------------  *
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  19.  *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
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  20.  *  -------------------------------------------------  *
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  21.  *  |    d12    |    d13    |    d14    |    d15    |  *
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  22.  *  -------------------------------------------------  *
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  23.  *  -------------------------------------------------  *
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  24.  *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *
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  25.  *  -------------------------------------------------  *
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  26.  *  | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c|  *
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  27.  *  -------------------------------------------------  *
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  28.  *  |    x19    |    x20    |    x21    |    x22    |  *
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  29.  *  -------------------------------------------------  *
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  30.  *  -------------------------------------------------  *
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  31.  *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *
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  32.  *  -------------------------------------------------  *
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  33.  *  | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c|  *
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  34.  *  -------------------------------------------------  *
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  35.  *  |    x23    |    x24    |    x25    |    x26    |  *
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  36.  *  -------------------------------------------------  *
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  38.  *  |  32 |  33 |  34 |  35 |  36 |  37 |  38 |  39 |  *
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  39.  *  -------------------------------------------------  *
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  40.  *  | 0x80| 0x84| 0x88| 0x8c| 0x90| 0x94| 0x98| 0x9c|  *
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  41.  *  -------------------------------------------------  *
    42. 

  42.  *  |    x27    |    x28    |    FP     |     LR    |  *
    43. 

  43.  *  -------------------------------------------------  *
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  44.  *  -------------------------------------------------  *
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  45.  *  |  40 |  41 |  42 | 43  |           |           |  *
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  46.  *  -------------------------------------------------  *
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  47.  *  | 0xa0| 0xa4| 0xa8| 0xac|           |           |  *
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  48.  *  -------------------------------------------------  *
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  49.  *  |     PC    |   align   |           |           |  *
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  50.  *  -------------------------------------------------  *
    51. 

  51.  *                                                     *
    52. 

  52.  *******************************************************/
    53. 

  53. 

  54. .text
    55. 

  55. .align  2
    56. 

  56. .global make_fcontext
    57. 

  57. .type   make_fcontext, %function
    58. 

  58. make_fcontext:
    59. 

  59.     # shift address in x0 (allocated stack) to lower 16 byte boundary
    60. 

  60.     and x0, x0, ~0xF
    61. 

  61. 

  62.     # reserve space for context-data on context-stack
    63. 

  63.     sub  x0, x0, #0xb0
    64. 

  64. 

  65.     # third arg of make_fcontext() == address of context-function
    66. 

  66.     # store address as a PC to jump in
    67. 

  67.     str  x2, [x0, #0xa0]
    68. 

  68. 

  69.     # save address of finish as return-address for context-function
    70. 

  70.     # will be entered after context-function returns (LR register)
    71. 

  71.     adr  x1, finish
    72. 

  72.     str  x1, [x0, #0x98]
    73. 

  73. 

  74.     ret  x30 // return pointer to context-data (x0)
    75. 

  75. 

  76. finish:
    77. 

  77.     # exit code is zero
    78. 

  78.     mov  x0, #0
    79. 

  79.     # exit application
    80. 

  80.     bl  _exit
    81. 

  81. 

  82. .size   make_fcontext,.-make_fcontext
    83. 

  83. # Mark that we don't need executable stack.
    84. 

  84. .section .note.GNU-stack,"",%progbits
    85.