#------------------------------------------------------------------------------

#

# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>

# This program and the accompanying materials

# are licensed and made available under the terms and conditions of the BSD License

# which accompanies this distribution. The full text of the license may be found at

# http://opensource.org/licenses/bsd-license.php.

#

# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,

# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

#

# Module Name:

#

# SwitchStack.S

#

# Abstract:

#

#------------------------------------------------------------------------------

#------------------------------------------------------------------------------

# Routine Description:

#

# Routine for switching stacks with 2 parameters

#

# Arguments:

#

# (rcx) EntryPoint - Entry point with new stack.

# (rdx) Context1 - Parameter1 for entry point.

# (r8) Context2 - Parameter2 for entry point.

# (r9) NewStack - The pointer to new stack.

#

# Returns:

#

# None

#

#------------------------------------------------------------------------------

ASM_GLOBAL ASM_PFX(InternalSwitchStack)

ASM_PFX(InternalSwitchStack):

pushq %rbp

movq %rsp, %rbp

mov %rcx, %rax // Shift registers for new call

mov %rdx, %rcx

mov %r8, %rdx

#

# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,

# in case the callee wishes to spill them.

#

lea -0x20(%r9), %rsp

pushq $0 // stop gdb stack unwind

jmp *%rax // call EntryPoint ()