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55 lines
1.9 KiB
C
55 lines
1.9 KiB
C
/** @file
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SwitchStack() function for IA-32.
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Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "BaseLibInternals.h"
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/**
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Transfers control to a function starting with a new stack.
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Transfers control to the function specified by EntryPoint using the
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new stack specified by NewStack and passing in the parameters specified
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by Context1 and Context2. Context1 and Context2 are optional and may
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be NULL. The function EntryPoint must never return.
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Marker will be ignored on IA-32, x64, and EBC.
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IPF CPUs expect one additional parameter of type VOID * that specifies
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the new backing store pointer.
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If EntryPoint is NULL, then ASSERT().
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If NewStack is NULL, then ASSERT().
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@param EntryPoint A pointer to function to call with the new stack.
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@param Context1 A pointer to the context to pass into the EntryPoint
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function.
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@param Context2 A pointer to the context to pass into the EntryPoint
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function.
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@param NewStack A pointer to the new stack to use for the EntryPoint
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function.
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@param Marker VA_LIST marker for the variable argument list.
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**/
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VOID
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EFIAPI
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InternalSwitchStack (
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IN SWITCH_STACK_ENTRY_POINT EntryPoint,
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IN VOID *Context1, OPTIONAL
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IN VOID *Context2, OPTIONAL
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IN VOID *NewStack,
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IN VA_LIST Marker
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)
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{
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BASE_LIBRARY_JUMP_BUFFER JumpBuffer;
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JumpBuffer.Eip = (UINTN)EntryPoint;
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JumpBuffer.Esp = (UINTN)NewStack - sizeof (VOID*);
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JumpBuffer.Esp -= sizeof (Context1) + sizeof (Context2);
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((VOID**)JumpBuffer.Esp)[1] = Context1;
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((VOID**)JumpBuffer.Esp)[2] = Context2;
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LongJump (&JumpBuffer, (UINTN)-1);
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}
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