1 ;------------------------------------------------------------------------------ 2 ; 3 ; Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 ; This program and the accompanying materials 5 ; are licensed and made available under the terms and conditions of the BSD License 6 ; which accompanies this distribution. The full text of the license may be found at 7 ; http://opensource.org/licenses/bsd-license.php. 8 ; 9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 11 ; 12 ; Module Name: 13 ; 14 ; SwitchStack.Asm 15 ; 16 ; Abstract: 17 ; 18 ;------------------------------------------------------------------------------ 19 20 DEFAULT REL 21 SECTION .text 22 23 ;------------------------------------------------------------------------------ 24 ; Routine Description: 25 ; 26 ; Routine for switching stacks with 2 parameters 27 ; 28 ; Arguments: 29 ; 30 ; (rcx) EntryPoint - Entry point with new stack. 31 ; (rdx) Context1 - Parameter1 for entry point. 32 ; (r8) Context2 - Parameter2 for entry point. 33 ; (r9) NewStack - The pointer to new stack. 34 ; 35 ; Returns: 36 ; 37 ; None 38 ; 39 ;------------------------------------------------------------------------------ 40 global ASM_PFX(InternalSwitchStack) 41 ASM_PFX(InternalSwitchStack): 42 mov rax, rcx 43 mov rcx, rdx 44 mov rdx, r8 45 ; 46 ; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack, 47 ; in case the callee wishes to spill them. 48 ; 49 lea rsp, [r9 - 0x20] 50 call rax 51 52
