MdePkg/Library/BaseLib/X64/SwitchStack.S File Reference
Detailed Description
#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.
# 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 ()