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49 lines
1.6 KiB
49 lines
1.6 KiB
4 years ago
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#------------------------------------------------------------------------------
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#
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# Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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# Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR>
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# 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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#
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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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#
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# Module Name:
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#
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# InternalSwitchStack.S
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#
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# Abstract:
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#
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# Implementation of a stack switch on IA-32.
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#
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#------------------------------------------------------------------------------
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ASM_GLOBAL ASM_PFX(InternalSwitchStack)
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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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# );
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#------------------------------------------------------------------------------
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ASM_PFX(InternalSwitchStack):
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pushl %ebp
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movl %esp, %ebp
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movl 20(%ebp), %esp # switch stack
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subl $8, %esp
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movl 16(%ebp), %eax
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movl %eax, 4(%esp)
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movl 12(%ebp), %eax
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movl %eax, (%esp)
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pushl $0 # keeps gdb from unwinding stack
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jmp *8(%ebp) # call and never return
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