4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#------------------------------------------------------------------------------
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# This program and the accompanying materials
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# are licensed and made available under the terms and conditions of the BSD License
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# which accompanies this distribution. The full text of the license may be found at
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# http://opensource.org/licenses/bsd-license.php.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Module Name:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# SwitchStack.S
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Abstract:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#------------------------------------------------------------------------------
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#------------------------------------------------------------------------------
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Routine Description:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Routine for switching stacks with 2 parameters
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Arguments:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# (rcx) EntryPoint - Entry point with new stack.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# (rdx) Context1 - Parameter1 for entry point.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# (r8) Context2 - Parameter2 for entry point.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# (r9) NewStack - The pointer to new stack.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# Returns:
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync# None
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync#------------------------------------------------------------------------------
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncASM_GLOBAL ASM_PFX(InternalSwitchStack)
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsyncASM_PFX(InternalSwitchStack):
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync pushq %rbp
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync movq %rsp, %rbp
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync mov %rcx, %rax // Shift registers for new call
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync mov %rdx, %rcx
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync mov %r8, %rdx
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync #
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync # in case the callee wishes to spill them.
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync #
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync lea -0x20(%r9), %rsp
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync pushq $0 // stop gdb stack unwind
4fd606d1f5abe38e1f42c38de1d2e895166bd0f4vboxsync jmp *%rax // call EntryPoint ()