Current IPF version SwitchStack implementation uses loadrs instruction to restore...

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ipf / SwitchStack.s

/// @file\r
///  IPF specific SwitchStack() function\r
///\r
/// Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>\r
/// This program and the accompanying materials\r
/// are licensed and made available under the terms and conditions of the BSD License\r
/// which accompanies this distribution.  The full text of the license may be found at\r
/// http://opensource.org/licenses/bsd-license.php.\r
///\r
/// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
/// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
///\r
/// Module Name: SwitchStack.s\r
///\r
///\r
\r
.auto\r
.text\r
\r
.proc   AsmSwitchStackAndBackingStore\r
.type   AsmSwitchStackAndBackingStore, @function\r
.regstk 5, 0, 0, 0\r
AsmSwitchStackAndBackingStore::\r
        mov                 r14 = ar.rsc\r
        movl                r2  = ~((((1 << 14) - 1) << 16) | 3)\r
\r
        mov                 r17 = in1\r
        mov                 r18 = in2\r
        and                 r2  = r14, r2\r
        \r
        flushrs\r
        \r
        mov                 ar.rsc = r2\r
        mov                 sp  = in3\r
        mov                 r19 = in4\r
\r
        ld8.nt1             r16 = [in0], 8\r
        ld8.nta             gp  = [in0]\r
        mov                 r3  = -1\r
\r
        loadrs\r
        mov                 ar.bspstore = r19\r
        mov                 b7  = r16\r
\r
        alloc               r2  = ar.pfs, 0, 0, 2, 0\r
        mov                 out0 = r17\r
        mov                 out1 = r18\r
\r
        mov                 ar.rnat = r3\r
        mov                 ar.rsc = r14\r
        br.call.sptk.many   b0  = b7\r
.endp   AsmSwitchStackAndBackingStore\r