1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 # Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR> 5 # This program and the accompanying materials 6 # are licensed and made available under the terms and conditions of the BSD License 7 # which accompanies this distribution. The full text of the license may be found at 8 # http://opensource.org/licenses/bsd-license.php. 9 # 10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 # 13 # Module Name: 14 # 15 # InternalSwitchStack.S 16 # 17 # Abstract: 18 # 19 # Implementation of a stack switch on IA-32. 20 # 21 #------------------------------------------------------------------------------ 22 23 ASM_GLOBAL ASM_PFX(InternalSwitchStack) 24 25 #------------------------------------------------------------------------------ 26 # VOID 27 # EFIAPI 28 # InternalSwitchStack ( 29 # IN SWITCH_STACK_ENTRY_POINT EntryPoint, 30 # IN VOID *Context1, OPTIONAL 31 # IN VOID *Context2, OPTIONAL 32 # IN VOID *NewStack 33 # ); 34 #------------------------------------------------------------------------------ 35 ASM_PFX(InternalSwitchStack): 36 pushl %ebp 37 movl %esp, %ebp 38 39 movl 20(%ebp), %esp # switch stack 40 subl $8, %esp 41 42 movl 16(%ebp), %eax 43 movl %eax, 4(%esp) 44 movl 12(%ebp), %eax 45 movl %eax, (%esp) 46 pushl $0 # keeps gdb from unwinding stack 47 jmp *8(%ebp) # call and never return 48 49
