#------------------------------------------------------------------------------ | |
# | |
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> | |
# Portions copyright (c) 2011, Apple Inc. All rights reserved. | |
# SPDX-License-Identifier: BSD-2-Clause-Patent | |
# | |
#------------------------------------------------------------------------------ | |
#------------------------------------------------------------------------------ | |
# Routine Description: | |
# | |
# Routine for switching stacks with 2 parameters EFI ABI | |
# Convert UNIX to EFI ABI | |
# | |
# Arguments: | |
# | |
# (rdi) EntryPoint - Entry point with new stack. | |
# (rsi) Context1 - Parameter1 for entry point. (rcx) | |
# (rdx) Context2 - Parameter2 for entry point. (rdx) | |
# (rcx) NewStack - The pointer to new stack. | |
# | |
# Returns: | |
# | |
# None | |
# | |
#------------------------------------------------------------------------------ | |
ASM_GLOBAL ASM_PFX(PeiSwitchStacks) | |
ASM_PFX(PeiSwitchStacks): | |
pushq $0 // tells gdb to stop unwinding frame | |
movq %rsp, %rbp | |
movq %rcx, %rsp // update stack pointer | |
movq %rdi, %rax // entry point to %rax | |
movq %rsi, %rcx // Adjust Context1 | |
// Context2 already in the rigth spot | |
# | |
# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack, | |
# in case the callee wishes to spill them. | |
# | |
subq $32, %rsp // 32-byte shadow space plus alignment pad | |
call *%rax | |