libs/context/src/asm/make_arm_aapcs_macho_gas.S

   1 /*
   2             Copyright Oliver Kowalke 2009.
   3    Distributed under the Boost Software License, Version 1.0.
   4       (See accompanying file LICENSE_1_0.txt or copy at
   5           http://www.boost.org/LICENSE_1_0.txt)
   6 */
   7
   8 /*******************************************************
   9  *                                                     *
  10  *  -------------------------------------------------  *
  11  *  |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  *
  12  *  -------------------------------------------------  *
  13  *  | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c|  *
  14  *  -------------------------------------------------  *
  15  *  | s16 | s17 | s18 | s19 | s20 | s21 | s22 | s23 |  *
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  18  *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
  19  *  -------------------------------------------------  *
  20  *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
  21  *  -------------------------------------------------  *
  22  *  | s24 | s25 | s26 | s27 | s28 | s29 | s30 | s31 |  *
  23  *  -------------------------------------------------  *
  24  *  -------------------------------------------------  *
  25  *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *
  26  *  -------------------------------------------------  *
  27  *  | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c|  *
  28  *  -------------------------------------------------  *
  29  *  | sjlj|hiddn|  v1 |  v2 |  v3 |  v4 |  v5 |  v6 |  *
  30  *  -------------------------------------------------  *
  31  *  -------------------------------------------------  *
  32  *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *
  33  *  -------------------------------------------------  *
  34  *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
  35  *  -------------------------------------------------  *
  36  *  |  v7 |  v8 |  lr |  pc | FCTX| DATA|           |  *
  37  *  -------------------------------------------------  *
  38  *                                                     *
  39  *******************************************************/
  40
  41 .text
  42 .globl _make_fcontext
  43 .align 2
  44 _make_fcontext:
  45     @ shift address in A1 to lower 16 byte boundary
  46     bic  a1, a1, #15
  47
  48     @ reserve space for context-data on context-stack
  49     sub  a1, a1, #124
  50
  51     @ third arg of make_fcontext() == address of context-function
  52     str  a3, [a1, #108]
  53
  54     @ compute address of returned transfer_t
  55     add  a2, a1, #112
  56     mov  a3, a2
  57     str  a3, [a1, #68]
  58
  59     @ compute abs address of label finish
  60     adr  a2, finish
  61     @ save address of finish as return-address for context-function
  62     @ will be entered after context-function returns
  63     str  a2, [a1, #104]
  64
  65     bx  lr @ return pointer to context-data
  66
  67 finish:
  68     @ exit code is zero
  69     mov  a1, #0
  70     @ exit application
  71     bl  __exit