1 #------------------------------------------------------------------------------ 2 # 3 # Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4 # Portitions copyright (c) 2011, Apple Inc. All rights reserved. 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 #------------------------------------------------------------------------------ 14 15 16 #------------------------------------------------------------------------------ 17 # Routine Description: 18 # 19 # Routine for switching stacks with 2 parameters EFI ABI 20 # Convert UNIX to EFI ABI 21 # 22 # Arguments: 23 # 24 # (rdi) EntryPoint - Entry point with new stack. 25 # (rsi) Context1 - Parameter1 for entry point. (rcx) 26 # (rdx) Context2 - Parameter2 for entry point. (rdx) 27 # (rcx) NewStack - The pointer to new stack. 28 # 29 # Returns: 30 # 31 # None 32 # 33 #------------------------------------------------------------------------------ 34 ASM_GLOBAL ASM_PFX(PeiSwitchStacks) 35 ASM_PFX(PeiSwitchStacks): 36 pushq $0 // tells gdb to stop unwinding frame 37 movq %rsp, %rbp 38 39 movq %rcx, %rsp // update stack pointer 40 41 movq %rdi, %rax // entry point to %rax 42 movq %rsi, %rcx // Adjust Context1 43 // Context2 already in the rigth spot 44 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 subq $32, %rsp // 32-byte shadow space plus alignment pad 50 call *%rax 51 52 53 54
