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.S 15 # 16 # Abstract: 17 # 18 #------------------------------------------------------------------------------ 19 20 21 #------------------------------------------------------------------------------ 22 # Routine Description: 23 # 24 # Routine for switching stacks with 2 parameters 25 # 26 # Arguments: 27 # 28 # (rcx) EntryPoint - Entry point with new stack. 29 # (rdx) Context1 - Parameter1 for entry point. 30 # (r8) Context2 - Parameter2 for entry point. 31 # (r9) NewStack - The pointer to new stack. 32 # 33 # Returns: 34 # 35 # None 36 # 37 #------------------------------------------------------------------------------ 38 ASM_GLOBAL ASM_PFX(InternalSwitchStack) 39 ASM_PFX(InternalSwitchStack): 40 pushq %rbp 41 movq %rsp, %rbp 42 43 mov %rcx, %rax // Shift registers for new call 44 mov %rdx, %rcx 45 mov %r8, %rdx 46 # 47 # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack, 48 # in case the callee wishes to spill them. 49 # 50 lea -0x20(%r9), %rsp 51 pushq $0 // stop gdb stack unwind 52 jmp *%rax // call EntryPoint () 53
