ceph/src/boost/libs/context/src/asm/make_mips64_n64_elf_gas.S

   1 /*
   2             Copyright Jiaxun Yang 2018.
   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  *  |     0     |     8     |    16     |     24    |  *
  14  *  -------------------------------------------------  *
  15  *  |    F24    |    F25    |    F26    |    F27    |  *
  16  *  -------------------------------------------------  *
  17  *  -------------------------------------------------  *
  18  *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
  19  *  -------------------------------------------------  *
  20  *  |     32    |    40     |     48    |     56    |  *
  21  *  -------------------------------------------------  *
  22  *  |    F28    |    F29    |    F30    |    F31    |  *
  23  *  -------------------------------------------------  *
  24  *  -------------------------------------------------  *
  25  *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *
  26  *  -------------------------------------------------  *
  27  *  |     64    |    72     |     80    |     88    |  *
  28  *  -------------------------------------------------  *
  29  *  |    S0     |    S1     |     S2    |     S3    |  *
  30  *  -------------------------------------------------  *
  31  *  -------------------------------------------------  *
  32  *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *
  33  *  -------------------------------------------------  *
  34  *  |  96 | 100 | 104 | 108 | 112 | 116 | 120 | 124 |  *
  35  *  -------------------------------------------------  *
  36  *  |    S4     |    S5     |     S6    |     S7    |  *
  37  *  -------------------------------------------------  *
  38  *  -------------------------------------------------  *
  39  *  |  32 |  33 |  34 |  35 |  36 |  37 |  38 |  39 |  *
  40  *  -------------------------------------------------  *
  41  *  | 128 | 132 | 136 | 140 | 144 | 148 | 152 | 156 |  *
  42  *  -------------------------------------------------  *
  43  *  |    FP     |    GP     |     RA    |     PC    |  *
  44  *  -------------------------------------------------  *
  45  *                                                     *
  46  * *****************************************************/
  47
  48 .file "make_mips64_n64_elf_gas.S"
  49 .text
  50 .globl make_fcontext
  51 .align 2
  52 .type make_fcontext,@function
  53 .ent make_fcontext
  54 make_fcontext:
  55 #ifdef __PIC__
  56 .set    noreorder
  57 .cpload $t9
  58 .set    reorder
  59 #endif
  60     # shift address in A0 to lower 16 byte boundary
  61     li $v1, 0xfffffffffffffff0
  62     and $v0, $v1, $a0
  63
  64     # reserve space for context-data on context-stack
  65     daddiu $v0, $v0, -160
  66
  67     # third arg of make_fcontext() == address of context-function
  68     sd  $a2, 152($v0)
  69     # save global pointer in context-data
  70     sd  $gp, 136($v0)
  71
  72     # psudo instruction compute abs address of label finish based on GP
  73     dla  $t9, finish
  74
  75     # save address of finish as return-address for context-function
  76     # will be entered after context-function returns
  77     sd  $t9, 144($v0)
  78
  79     jr  $ra # return pointer to context-data
  80
  81 finish:
  82     # reload our gp register (needed for la)
  83     daddiu $t0, $sp, -160
  84     ld $gp, 136($t0)
  85
  86     # call _exit(0)
  87     #  the previous function should have left the 16 bytes incoming argument
  88     #  area on the stack which we reuse for calling _exit
  89     dla $t9, _exit
  90     move $a0, $zero
  91     jr $t9
  92 .end make_fcontext
  93 .size make_fcontext, .-make_fcontext
  94
  95 /* Mark that we don't need executable stack.  */
  96 .section .note.GNU-stack,"",%progbits