/** @file | |
SwitchStack() function for IA-32. | |
Copyright (c) 2006, Intel Corporation<BR> | |
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: InternalSwitchStack.c | |
**/ | |
/** | |
Transfers control to a function starting with a new stack. | |
Transfers control to the function specified by EntryPoint using the new stack | |
specified by NewStack and passing in the parameters specified by Context1 and | |
Context2. Context1 and Context2 are optional and may be NULL. The function | |
EntryPoint must never return. | |
@param EntryPoint A pointer to function to call with the new stack. | |
@param Context1 A pointer to the context to pass into the EntryPoint | |
function. | |
@param Context2 A pointer to the context to pass into the EntryPoint | |
function. | |
@param NewStack A pointer to the new stack to use for the EntryPoint | |
function. | |
**/ | |
VOID | |
EFIAPI | |
InternalSwitchStack ( | |
IN SWITCH_STACK_ENTRY_POINT EntryPoint, | |
IN VOID *Context1, | |
IN VOID *Context2, | |
IN VOID *NewStack | |
) | |
{ | |
BASE_LIBRARY_JUMP_BUFFER JumpBuffer; | |
JumpBuffer.Eip = (UINTN)EntryPoint; | |
JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*); | |
JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2); | |
((VOID**)JumpBuffer.Esp)[1] = Context1; | |
((VOID**)JumpBuffer.Esp)[2] = Context2; | |
LongJump (&JumpBuffer, (UINTN)-1); | |
} |