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

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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
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@ -1,6 +1,6 @@
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
# #
# Copyright (c) 2006, Intel Corporation # Copyright (c) 2006 - 2008, Intel Corporation
# All rights reserved. This program and the accompanying materials # All rights reserved. This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License # 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 # which accompanies this distribution. The full text of the license may be found at
@ -21,14 +21,14 @@
#------------------------------------------------------------------------------ #------------------------------------------------------------------------------
# Routine Description: # Routine Description:
# #
# Routine for switching stacks with 1 parameter # Routine for switching stacks with 2 parameters
# #
# Arguments: # Arguments:
# #
# (rdi) EntryPoint - Entry point with new stack. # (rcx) EntryPoint - Entry point with new stack.
# (rsi) Context1 - Parameter1 for entry point. # (rdx) Context1 - Parameter1 for entry point.
# (rdx) Context2 - Parameter2 for entry point. # (r8) Context2 - Parameter2 for entry point.
# (rcx) NewStack - Pointer to new stack. # (r9) NewStack - Pointer to new stack.
# #
# Returns: # Returns:
# #
@ -40,5 +40,9 @@ _InternalSwitchStack:
mov %rcx, %rax mov %rcx, %rax
mov %rdx, %rcx mov %rdx, %rcx
mov %r8, %rdx 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 lea -0x20(%r9), %rsp
call *%rax 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 ; All rights reserved. This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License ; 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 ; which accompanies this distribution. The full text of the license may be found at
@ -22,12 +22,12 @@
;------------------------------------------------------------------------------ ;------------------------------------------------------------------------------
; Routine Description: ; Routine Description:
; ;
; Routine for switching stacks with 1 parameter ; Routine for switching stacks with 2 parameters
; ;
; Arguments: ; Arguments:
; ;
; (rcx) EntryPoint - Entry point with new stack. ; (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. ; (r8) Context2 - Parameter2 for entry point.
; (r9) NewStack - Pointer to new stack. ; (r9) NewStack - Pointer to new stack.
; ;
@ -40,6 +40,10 @@ InternalSwitchStack PROC
mov rax, rcx mov rax, rcx
mov rcx, rdx mov rcx, rdx
mov rdx, r8 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] lea rsp, [r9 - 20h]
call rax call rax
InternalSwitchStack ENDP InternalSwitchStack ENDP