ceph/src/boost/libs/context/src/asm/jump_arm_aapcs_pe_armasm.asm

   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 ; *  |deall|limit| base|hiddn|  v1 |  v2 |  v3 |  v4 |  *
  16 ; *  -------------------------------------------------  *
  17 ; *  -------------------------------------------------  *
  18 ; *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
  19 ; *  -------------------------------------------------  *
  20 ; *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
  21 ; *  -------------------------------------------------  *
  22 ; *  |  v5 |  v6 |  v7 |  v8 |  lr |  pc | FCTX| DATA|  *
  23 ; *  -------------------------------------------------  *
  24 ; *                                                     *
  25 ; *******************************************************
  26
  27     AREA |.text|, CODE
  28     ALIGN 4
  29     EXPORT jump_fcontext
  30
  31 jump_fcontext PROC
  32     ; save LR as PC
  33     push {lr}
  34     ; save hidden,V1-V8,LR
  35     push {a1,v1-v8,lr}
  36
  37     ; load TIB to save/restore thread size and limit.
  38     ; we do not need preserve CPU flag and can use it's arg register
  39     mrc     p15, #0, v1, c13, c0, #2
  40
  41     ; save current stack base
  42     ldr  a5, [v1, #0x04]
  43     push {a5}
  44     ; save current stack limit
  45     ldr  a5, [v1, #0x08]
  46     push {a5}
  47     ; save current deallocation stack
  48     ldr  a5, [v1, #0xe0c]
  49     push {a5}
  50
  51     ; store RSP (pointing to context-data) in A1
  52     mov  a1, sp
  53
  54     ; restore RSP (pointing to context-data) from A2
  55     mov  sp, a2
  56
  57     ; restore deallocation stack
  58     pop  {a5}
  59     str  a5, [v1, #0xe0c]
  60     ; restore stack limit
  61     pop  {a5}
  62     str  a5, [v1, #0x08]
  63     ; restore stack base
  64     pop  {a5}
  65     str  a5, [v1, #0x04]
  66
  67     ; restore hidden,V1-V8,LR
  68     pop {a4,v1-v8,lr}
  69
  70     ; return transfer_t from jump
  71     str  a1, [a4, #0]
  72     str  a3, [a4, #4]
  73     ; pass transfer_t as first arg in context function
  74     ; A1 == FCTX, A2 == DATA
  75     mov  a2, a3
  76
  77     ; restore PC
  78     pop {pc}
  79
  80     ENDP
  81     END