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#------------------------------------------------------------------------------
#
# 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 3 parameters EFI ABI
# Convert UNIX to EFI ABI
#
# Arguments:
#
# (rdi) EntryPoint - Entry point with new stack.
# (rsi) Context1 - Parameter1 for entry point. (rcx)
# (rdx) Context2 - Parameter2 for entry point. (rdx)
# (rcx) Context3 - Parameter3 for entry point. (r8)
# (r8) NewStack - The pointer to new stack.
#
# Returns:
#
# None
#
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(PeiSwitchStacks)
ASM_PFX(PeiSwitchStacks):
pushq %rbp // stack frame is for the debugger
movq %rsp, %rbp
movq %r8, %rsp
movq %rdi, %rax
movq %rsi, %rcx
movq %rcx, %r8
#
# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
# in case the callee wishes to spill them.
#
subq $32, %rsp // 32-byte shadow space plus alignment pad
call *%rax
#------------------------------------------------------------------------------
# Routine Description:
#
# Routine for switching stacks with 3 parameters UNIX ABI
#
# Arguments:
#
# (rdi) EntryPoint - Entry point with new stack.
# (rsi) Context1 - Parameter1 for entry point.
# (rdx) Context2 - Parameter2 for entry point.
# (rcx) Context3 - Parameter3 for entry point.
# (r8) NewStack - The pointer to new stack.
#
# Returns:
#
# None
#
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(UnixPeiSwitchStacks)
ASM_PFX(UnixPeiSwitchStacks):
pushq %rbp // stack frame is for the debugger
movq %rsp, %rbp
mov %rdi, %rax
mov %rsi, %rdi
mov %rdx, %rsi
mov %rcx, %rdx
mov %r8, %rsp
#
# Reserve space for redzone on the stack,
# in case the callee wishes to spill them.
#
lea -0x80(%rsp), %rsp
call *%rax
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# SecSwitchStack (
# UINT32 TemporaryMemoryBase, // Rcx, Rdi
# UINT32 PermenentMemoryBase // Rdx, Rsi
# );
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(SecSwitchStack)
ASM_PFX(SecSwitchStack):
pushq %rbp // stack frame is for the debugger
movq %rsp, %rbp
mov %rsp, %rax
sub %rdi, %rax
add %rsi, %rax
mov (%rip), %r10
mov %r10, (%rax)
popq %rbp
ret
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