/** @file | |
SwitchStack() function for IA-32. | |
Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include "BaseLibInternals.h" | |
/** | |
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. | |
Marker will be ignored on IA-32, x64, and EBC. | |
IPF CPUs expect one additional parameter of type VOID * that specifies | |
the new backing store pointer. | |
If EntryPoint is NULL, then ASSERT(). | |
If NewStack is NULL, then ASSERT(). | |
@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. | |
@param Marker VA_LIST marker for the variable argument list. | |
**/ | |
VOID | |
EFIAPI | |
InternalSwitchStack ( | |
IN SWITCH_STACK_ENTRY_POINT EntryPoint, | |
IN VOID *Context1 OPTIONAL, | |
IN VOID *Context2 OPTIONAL, | |
IN VOID *NewStack, | |
IN VA_LIST Marker | |
) | |
{ | |
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); | |
} |