EdkCompatibilityPkg/Foundation/Library/EdkIIGlueLib/Library/BaseLib/Ipf/SwitchStack.s

   1 /// Copyright (c) 2004, Intel Corporation
   2 /// All rights reserved. This program and the accompanying materials
   3 /// are licensed and made available under the terms and conditions of the BSD License
   4 /// which accompanies this distribution.  The full text of the license may be found at
   5 /// http://opensource.org/licenses/bsd-license.php
   6 ///
   7 /// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   8 /// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   9 ///
  10 /// Module Name:
  11 ///
  12 ///   SwitchStack.s
  13 ///
  14 /// Abstract:
  15 ///
  16 ///
  17
  18 .auto
  19 .text
  20
  21 .proc   AsmSwitchStackAndBackingStore
  22 .type   AsmSwitchStackAndBackingStore, @function
  23 .regstk 5, 0, 0, 0
  24 AsmSwitchStackAndBackingStore::
  25         mov                 r14 = ar.rsc
  26         movl                r2  = ~((((1 << 14) - 1) << 16) | 3)
  27
  28         mov                 r17 = in1
  29         mov                 r18 = in2
  30         and                 r2  = r14, r2
  31
  32         mov                 ar.rsc = r2
  33         mov                 sp  = in3
  34         mov                 r19 = in4
  35
  36         ld8.nt1             r16 = [in0], 8
  37         ld8.nta             gp  = [in0]
  38         mov                 r3  = -1
  39
  40         loadrs
  41         mov                 ar.bspstore = r19
  42         mov                 b7  = r16
  43
  44         alloc               r2  = ar.pfs, 0, 0, 2, 0
  45         mov                 out0 = r17
  46         mov                 out1 = r18
  47
  48         mov                 ar.rnat = r3
  49         mov                 ar.rsc = r14
  50         br.call.sptk.many   b0  = b7
  51 .endp   AsmSwitchStackAndBackingStore