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1. Add comments about reserve space on space according to x64 calling convention 

2. Fix comments in SwitchStack as for the x64 calling convention.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5315 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
qhuang8 2008-05-30 02:03:15 +00:00
parent fbbe00ad9d
commit d2e6d78887
2 changed files with 17 additions and 9 deletions
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16
MdePkg/Library/BaseLib/X64/SwitchStack.S
View File

@ -1,6 +1,6 @@
#------------------------------------------------------------------------------
#
# Copyright (c) 2006, Intel Corporation
# 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
@ -21,14 +21,14 @@
#------------------------------------------------------------------------------
# Routine Description:
#
# Routine for switching stacks with 1 parameter
# Routine for switching stacks with 2 parameters
#
# Arguments:
#
# (rdi) EntryPoint - Entry point with new stack.
# (rsi) Context1 - Parameter1 for entry point.
# (rdx) Context2 - Parameter2 for entry point.
# (rcx) NewStack - Pointer to new stack.
# (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:
#
@ -40,5 +40,9 @@ _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

10
MdePkg/Library/BaseLib/X64/SwitchStack.asm
View File

@ -1,6 +1,6 @@
;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation
; 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
@ -22,12 +22,12 @@
;------------------------------------------------------------------------------
; Routine Description:
;
; Routine for switching stacks with 1 parameter
; Routine for switching stacks with 2 parameters
;
; Arguments:
;
; (rcx) EntryPoint - Entry point with new stack.
; (rdx) Context - Parameter for entry point.
; (rdx) Context1 - Parameter1 for entry point.
; (r8) Context2 - Parameter2 for entry point.
; (r9) NewStack - Pointer to new stack.
;
@ -40,6 +40,10 @@ InternalSwitchStack PROC
mov rax, rcx
mov rcx, rdx
mov rdx, r8
;
; Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
; in case the callee wishes to spill them.
;
lea rsp, [r9 - 20h]
call rax
InternalSwitchStack ENDP