1. adjust contents layout of SPD header editor, FPD header editor.

[mirror_edk2.git] / EdkModulePkg / Universal / Ebc / Dxe / Ipf / EbcLowLevel.s

//++\r
// Copyright (c) 2006, Intel Corporation                                                         \r
// All rights reserved. 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:\r
//\r
//   EbcLowLevel.s\r
//\r
// Abstract:\r
//\r
//   Contains low level routines for the Virtual Machine implementation\r
//   on an Itanium-based platform.\r
//\r
//\r
//--\r
\r
.file  "EbcLowLevel.s"\r
\r
#define PROCEDURE_ENTRY(name)   .##text;            \\r
                                .##type name, @function;    \\r
                                .##proc name;           \\r
name::\r
\r
#define PROCEDURE_EXIT(name)    .##endp name\r
\r
// Note: use of NESTED_SETUP requires number of locals (l) >= 3\r
\r
#define NESTED_SETUP(i,l,o,r) \\r
         alloc loc1=ar##.##pfs,i,l,o,r ;\\r
         mov loc0=b0\r
\r
#define NESTED_RETURN \\r
         mov b0=loc0 ;\\r
         mov ar##.##pfs=loc1 ;;\\r
         br##.##ret##.##dpnt  b0;;\r
\r
\r
//-----------------------------------------------------------------------------\r
//++\r
// EbcAsmLLCALLEX\r
//\r
//  Implements the low level EBC CALLEX instruction. Sets up the\r
//  stack pointer, does the spill of function arguments, and\r
//  calls the native function. On return it restores the original\r
//  stack pointer and returns to the caller.\r
//\r
// Arguments : \r
//\r
// On Entry :\r
//    in0 = Address of native code to call\r
//    in1 = New stack pointer\r
//\r
// Return Value: \r
// \r
// As per static calling conventions. \r
// \r
//--\r
//---------------------------------------------------------------------------\r
;// void EbcAsmLLCALLEX (UINTN FunctionAddr, UINTN EbcStackPointer)\r
PROCEDURE_ENTRY(EbcAsmLLCALLEX)\r
  NESTED_SETUP (2,6,8,0)\r
\r
  // NESTED_SETUP uses loc0 and loc1 for context save\r
\r
  //\r
  // Save a copy of the EBC VM stack pointer\r
  //\r
  mov r8 = in1;;\r
\r
  //\r
  // Copy stack arguments from EBC stack into registers. \r
  // Assume worst case and copy 8.\r
  //\r
  ld8   out0 = [r8], 8;;\r
  ld8   out1 = [r8], 8;;\r
  ld8   out2 = [r8], 8;;\r
  ld8   out3 = [r8], 8;;\r
  ld8   out4 = [r8], 8;;\r
  ld8   out5 = [r8], 8;;\r
  ld8   out6 = [r8], 8;;\r
  ld8   out7 = [r8], 8;;\r
\r
  //\r
  // Save the original stack pointer\r
  //\r
  mov   loc2 = r12;\r
\r
  //\r
  // Save the gp\r
  //\r
  or    loc3 = r1, r0\r
\r
  //\r
  // Set the new aligned stack pointer. Reserve space for the required \r
  // 16-bytes of scratch area as well.\r
  //\r
  add  r12 = 48, in1\r
\r
  //\r
  // Now call the function. Load up the function address from the descriptor\r
  // pointed to by in0. Then get the gp from the descriptor at the following\r
  // address in the descriptor.\r
  //\r
  ld8   r31 = [in0], 8;;\r
  ld8   r30 = [in0];;\r
  mov   b1 = r31\r
  mov   r1 = r30\r
  (p0) br.call.dptk.many b0 = b1;;\r
\r
  //\r
  // Restore the original stack pointer and gp\r
  //\r
  mov   r12 = loc2\r
  or    r1 = loc3, r0\r
\r
  //\r
  // Now return\r
  //\r
  NESTED_RETURN\r
\r
PROCEDURE_EXIT(EbcAsmLLCALLEX)\r
\r
//\r
// UINTN EbcLLGetEbcEntryPoint(VOID)\r
//\r
// Description:\r
//    Simply return, so that the caller retrieves the return register\r
//    contents (R8). That's where the thunk-to-ebc code stuffed the\r
//    EBC entry point.\r
//\r
PROCEDURE_ENTRY(EbcLLGetEbcEntryPoint)\r
    br.ret.sptk  b0 ;;\r
PROCEDURE_EXIT(EbcLLGetEbcEntryPoint)\r
\r
//\r
// INT64 EbcLLGetReturnValue(VOID)\r
//\r
// Description:\r
//    This function is called to get the value returned by native code\r
//     to EBC. It simply returns because the return value should still\r
//    be in the register, so the caller just gets the unmodified value.\r
//\r
PROCEDURE_ENTRY(EbcLLGetReturnValue)\r
    br.ret.sptk  b0 ;;\r
PROCEDURE_EXIT(EbcLLGetReturnValue)\r
\r
//\r
// UINTN EbcLLGetStackPointer(VOID)\r
//\r
PROCEDURE_ENTRY(EbcLLGetStackPointer)\r
    mov    r8 = r12 ;;\r
    br.ret.sptk  b0 ;;\r
    br.sptk.few b6 \r
PROCEDURE_EXIT(EbcLLGetStackPointer)\r
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