[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / SwitchStack.S

#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, Intel Corporation
# All rights reserved. This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution.  The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
# Module Name:
#
#   SwitchStack.S
#
# Abstract:
#
#------------------------------------------------------------------------------


#------------------------------------------------------------------------------
# Routine Description:
#
#   Routine for switching stacks with 2 parameters
#
# Arguments:
#
#   (rcx) EntryPoint    - Entry point with new stack.
#   (rdx) Context1      - Parameter1 for entry point.
#   (r8)  Context2      - Parameter2 for entry point.
#   (r9)  NewStack      - Pointer to new stack.
#
# Returns:
#
#   None
#
#------------------------------------------------------------------------------
.global ASM_PFX(InternalSwitchStack)
ASM_PFX(InternalSwitchStack):
    mov     %rcx, %rax
    mov     %rdx, %rcx
    mov     %r8, %rdx
    #
    # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
    # in case the callee wishes to spill them.
    #
    lea     -0x20(%r9), %rsp
    call    *%rax
Commit	Line	Data
f1baef62	1	#------------------------------------------------------------------------------
f1baef62	2	#
d2e6d788	3	# Copyright (c) 2006 - 2008, Intel Corporation
f1baef62	4	# All rights reserved. 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	#
d2e6d788	24	# Routine for switching stacks with 2 parameters
f1baef62	25	#
	26	# Arguments:
	27	#
d2e6d788	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 - Pointer to new stack.
f1baef62	32	#
	33	# Returns:
	34	#
	35	# None
	36	#
	37	#------------------------------------------------------------------------------
85c25283	38	.global ASM_PFX(InternalSwitchStack)
85c25283	39	ASM_PFX(InternalSwitchStack):
f1baef62	40	mov %rcx, %rax
	41	mov %rdx, %rcx
	42	mov %r8, %rdx
85c25283	43	#
	44	# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
	45	# in case the callee wishes to spill them.
d2e6d788	46	#
f1baef62	47	lea -0x20(%r9), %rsp
f1baef62	48	call *%rax