mirror of https://github.com/acidanthera/audk.git
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/** @file
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SwitchStack() function for IA-32.
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Copyright (c) 2006, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name: InternalSwitchStack.c
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**/
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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 new stack
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specified by NewStack and passing in the parameters specified by Context1 and
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Context2. Context1 and Context2 are optional and may be NULL. The function
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EntryPoint must never return.
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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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**/
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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,
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IN VOID *Context2,
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IN VOID *NewStack
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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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