[mirror_edk2.git] / UnixPkg / Library / UnixBaseLib / X64 / SwitchStack.S

#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
# This program and the accompanying materials\r
# are licensed and made available under the terms and conditions of the BSD License\r
# which accompanies this distribution.  The full text of the license may be found at\r
# http://opensource.org/licenses/bsd-license.php.\r
#\r
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
#\r
# Module Name:\r
#\r
#   SwitchStack.S\r
#\r
# Abstract:\r
#\r
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
# Routine Description:\r
#\r
#   Routine for switching stacks with 2 parameters\r
#\r
# Arguments:\r
#\r
#   (rcx) EntryPoint    - Entry point with new stack.\r
#   (rdx) Context1      - Parameter1 for entry point.\r
#   (r8)  Context2      - Parameter2 for entry point.\r
#   (r9)  NewStack      - The pointer to new stack.\r
#\r
# Returns:\r
#\r
#   None\r
#\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(InternalSwitchStack)\r
ASM_PFX(InternalSwitchStack):\r
    movq    %rcx, %rax\r
    movq    %rdx, %rcx\r
    movq    %r8,  %rdx\r
    #\r
    # Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,\r
    # in case the callee wishes to spill them.\r
    #\r
    lea     -0x20(%r9), %rsp\r
    call    *%rax\r
Commit	Line	Data
5fc3b5d6	1	#------------------------------------------------------------------------------\r
	2	#\r
	3	# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
	4	# This program and the accompanying materials\r
	5	# are licensed and made available under the terms and conditions of the BSD License\r
	6	# which accompanies this distribution. The full text of the license may be found at\r
	7	# http://opensource.org/licenses/bsd-license.php.\r
	8	#\r
	9	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	10	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	11	#\r
	12	# Module Name:\r
	13	#\r
	14	# SwitchStack.S\r
	15	#\r
	16	# Abstract:\r
	17	#\r
	18	#------------------------------------------------------------------------------\r
	19	\r
	20	\r
	21	#------------------------------------------------------------------------------\r
	22	# Routine Description:\r
	23	#\r
	24	# Routine for switching stacks with 2 parameters\r
	25	#\r
	26	# Arguments:\r
	27	#\r
	28	# (rcx) EntryPoint - Entry point with new stack.\r
	29	# (rdx) Context1 - Parameter1 for entry point.\r
	30	# (r8) Context2 - Parameter2 for entry point.\r
	31	# (r9) NewStack - The pointer to new stack.\r
	32	#\r
	33	# Returns:\r
	34	#\r
	35	# None\r
	36	#\r
	37	#------------------------------------------------------------------------------\r
5fc3b5d6	38	ASM_GLOBAL ASM_PFX(InternalSwitchStack)\r
5fc3b5d6	39	ASM_PFX(InternalSwitchStack):\r
bb111c23	40	movq %rcx, %rax\r
	41	movq %rdx, %rcx\r
	42	movq %r8, %rdx\r
5fc3b5d6	43	#\r
	44	# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,\r
	45	# in case the callee wishes to spill them.\r
	46	#\r
2ff79f2e	47	lea -0x20(%r9), %rsp\r
5fc3b5d6	48	call *%rax\r