#------------------------------------------------------------------------------
#
-# Copyright (c) 2006, Intel Corporation
+# 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
#------------------------------------------------------------------------------
# Routine Description:
#
-# Routine for switching stacks with 1 parameter
+# Routine for switching stacks with 2 parameters
#
# Arguments:
#
-# (rdi) EntryPoint - Entry point with new stack.
-# (rsi) Context1 - Parameter1 for entry point.
-# (rdx) Context2 - Parameter2 for entry point.
-# (rcx) NewStack - Pointer to new stack.
+# (rcx) EntryPoint - Entry point with new stack.
+# (rdx) Context1 - Parameter1 for entry point.
+# (r8) Context2 - Parameter2 for entry point.
+# (r9) NewStack - Pointer to new stack.
#
# Returns:
#
# None
#
#------------------------------------------------------------------------------
-.global _InternalSwitchStack;
-_InternalSwitchStack:
+.global ASM_PFX(InternalSwitchStack)
+ASM_PFX(InternalSwitchStack):
mov %rcx, %rax
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
call *%rax