[mirror_edk2.git] / InOsEmuPkg / Unix / Sec / X64 / SwitchStack.S

#------------------------------------------------------------------------------\r
#\r
# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
# Portitions copyright (c) 2011, Apple Inc. All rights reserved.\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
#------------------------------------------------------------------------------\r
\r
\r
#------------------------------------------------------------------------------\r
# Routine Description:\r
#\r
#   Routine for switching stacks with 2 parameters EFI ABI\r
#   Convert UNIX to EFI ABI\r
#\r
# Arguments:\r
#\r
#   (rdi) EntryPoint    - Entry point with new stack.\r
#   (rsi) Context1      - Parameter1 for entry point. (rcx)\r
#   (rdx) Context2      - Parameter2 for entry point. (rdx) \r
#   (rcx) NewStack      - The pointer to new stack.\r
#\r
# Returns:\r
#\r
#   None\r
#\r
#------------------------------------------------------------------------------\r
ASM_GLOBAL ASM_PFX(PeiSwitchStacks)\r
ASM_PFX(PeiSwitchStacks):\r
    pushq   $0            // tells gdb to stop unwinding frame\r
    movq    %rsp, %rbp\r
\r
    movq    %rcx, %rsp    // update stack pointer\r
    \r
    movq    %rdi, %rax    // entry point to %rax\r
    movq    %rsi, %rcx    // Adjust Context1\r
                          // Context2 already in the rigth spot\r
    \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
    subq    $32, %rsp  // 32-byte shadow space plus alignment pad\r
    call    *%rax\r
\r
  \r
\r
Commit	Line	Data
949f388f	1	#------------------------------------------------------------------------------\r
	2	#\r
	3	# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
	4	# Portitions copyright (c) 2011, Apple Inc. All rights reserved.\r
	5	# This program and the accompanying materials\r
	6	# are licensed and made available under the terms and conditions of the BSD License\r
	7	# which accompanies this distribution. The full text of the license may be found at\r
	8	# http://opensource.org/licenses/bsd-license.php.\r
	9	#\r
	10	# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	#\r
	13	#------------------------------------------------------------------------------\r
	14	\r
	15	\r
	16	#------------------------------------------------------------------------------\r
	17	# Routine Description:\r
	18	#\r
d59326d3	19	# Routine for switching stacks with 2 parameters EFI ABI\r
949f388f	20	# Convert UNIX to EFI ABI\r
	21	#\r
	22	# Arguments:\r
	23	#\r
	24	# (rdi) EntryPoint - Entry point with new stack.\r
	25	# (rsi) Context1 - Parameter1 for entry point. (rcx)\r
	26	# (rdx) Context2 - Parameter2 for entry point. (rdx) \r
d59326d3	27	# (rcx) NewStack - The pointer to new stack.\r
949f388f	28	#\r
	29	# Returns:\r
	30	#\r
	31	# None\r
	32	#\r
	33	#------------------------------------------------------------------------------\r
	34	ASM_GLOBAL ASM_PFX(PeiSwitchStacks)\r
	35	ASM_PFX(PeiSwitchStacks):\r
	36	pushq $0 // tells gdb to stop unwinding frame\r
	37	movq %rsp, %rbp\r
	38	\r
d59326d3	39	movq %rcx, %rsp // update stack pointer\r
949f388f	40	\r
d59326d3	41	movq %rdi, %rax // entry point to %rax\r
	42	movq %rsi, %rcx // Adjust Context1\r
	43	// Context2 already in the rigth spot\r
949f388f	44	\r
	45	#\r
	46	# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,\r
	47	# in case the callee wishes to spill them.\r
	48	#\r
	49	subq $32, %rsp // 32-byte shadow space plus alignment pad\r
	50	call *%rax\r
	51	\r
	52	\r
	53	\r