878ddf1fc3
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@3 6f19259b-4bc3-4df7-8a09-765794883524
168 lines
4.3 KiB
ArmAsm
168 lines
4.3 KiB
ArmAsm
//++
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// Copyright (c) 2006, Intel Corporation
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// All rights reserved. This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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// Module Name:
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//
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// EbcLowLevel.s
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//
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// Abstract:
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//
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// Contains low level routines for the Virtual Machine implementation
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// on an Itanium-based platform.
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//
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//
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//--
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.file "EbcLowLevel.s"
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#define PROCEDURE_ENTRY(name) .##text; \
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.##type name, @function; \
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.##proc name; \
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name::
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#define PROCEDURE_EXIT(name) .##endp name
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// Note: use of NESTED_SETUP requires number of locals (l) >= 3
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#define NESTED_SETUP(i,l,o,r) \
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alloc loc1=ar##.##pfs,i,l,o,r ;\
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mov loc0=b0
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#define NESTED_RETURN \
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mov b0=loc0 ;\
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mov ar##.##pfs=loc1 ;;\
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br##.##ret##.##dpnt b0;;
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//-----------------------------------------------------------------------------
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//++
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// EbcAsmLLCALLEX
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//
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// Implements the low level EBC CALLEX instruction. Sets up the
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// stack pointer, does the spill of function arguments, and
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// calls the native function. On return it restores the original
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// stack pointer and returns to the caller.
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//
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// Arguments :
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//
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// On Entry :
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// in0 = Address of native code to call
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// in1 = New stack pointer
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//
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// Return Value:
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//
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// As per static calling conventions.
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//
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//--
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//---------------------------------------------------------------------------
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;// void EbcAsmLLCALLEX (UINTN FunctionAddr, UINTN EbcStackPointer)
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PROCEDURE_ENTRY(EbcAsmLLCALLEX)
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NESTED_SETUP (2,6,8,0)
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// NESTED_SETUP uses loc0 and loc1 for context save
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//
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// Save a copy of the EBC VM stack pointer
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//
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mov r8 = in1;;
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//
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// Copy stack arguments from EBC stack into registers.
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// Assume worst case and copy 8.
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//
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ld8 out0 = [r8], 8;;
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ld8 out1 = [r8], 8;;
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ld8 out2 = [r8], 8;;
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ld8 out3 = [r8], 8;;
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ld8 out4 = [r8], 8;;
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ld8 out5 = [r8], 8;;
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ld8 out6 = [r8], 8;;
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ld8 out7 = [r8], 8;;
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//
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// Save the original stack pointer
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//
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mov loc2 = r12;
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//
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// Save the gp
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//
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or loc3 = r1, r0
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//
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// Set the new aligned stack pointer. Reserve space for the required
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// 16-bytes of scratch area as well.
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//
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add r12 = 48, in1
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//
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// Now call the function. Load up the function address from the descriptor
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// pointed to by in0. Then get the gp from the descriptor at the following
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// address in the descriptor.
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//
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ld8 r31 = [in0], 8;;
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ld8 r30 = [in0];;
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mov b1 = r31
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mov r1 = r30
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(p0) br.call.dptk.many b0 = b1;;
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//
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// Restore the original stack pointer and gp
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//
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mov r12 = loc2
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or r1 = loc3, r0
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//
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// Now return
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//
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NESTED_RETURN
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PROCEDURE_EXIT(EbcAsmLLCALLEX)
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//
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// UINTN EbcLLGetEbcEntryPoint(VOID)
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//
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// Description:
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// Simply return, so that the caller retrieves the return register
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// contents (R8). That's where the thunk-to-ebc code stuffed the
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// EBC entry point.
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//
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PROCEDURE_ENTRY(EbcLLGetEbcEntryPoint)
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br.ret.sptk b0 ;;
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PROCEDURE_EXIT(EbcLLGetEbcEntryPoint)
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//
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// INT64 EbcLLGetReturnValue(VOID)
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//
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// Description:
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// This function is called to get the value returned by native code
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// to EBC. It simply returns because the return value should still
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// be in the register, so the caller just gets the unmodified value.
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//
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PROCEDURE_ENTRY(EbcLLGetReturnValue)
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br.ret.sptk b0 ;;
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PROCEDURE_EXIT(EbcLLGetReturnValue)
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//
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// UINTN EbcLLGetStackPointer(VOID)
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//
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PROCEDURE_ENTRY(EbcLLGetStackPointer)
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mov r8 = r12 ;;
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br.ret.sptk b0 ;;
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br.sptk.few b6
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PROCEDURE_EXIT(EbcLLGetStackPointer)
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