mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-26 12:05:36 +01:00
55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/** @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);
|
|
}
|