diff options
Diffstat (limited to 'MdePkg')
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/SwitchStack.S | 16 | ||||
| -rw-r--r-- | MdePkg/Library/BaseLib/X64/SwitchStack.asm | 10 |
2 files changed, 17 insertions, 9 deletions
diff --git a/MdePkg/Library/BaseLib/X64/SwitchStack.S b/MdePkg/Library/BaseLib/X64/SwitchStack.S index 85cdb43..9aee37b 100644 --- a/MdePkg/Library/BaseLib/X64/SwitchStack.S +++ b/MdePkg/Library/BaseLib/X64/SwitchStack.S @@ -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 diff --git a/MdePkg/Library/BaseLib/X64/SwitchStack.asm b/MdePkg/Library/BaseLib/X64/SwitchStack.asm index 53d1417..380289a 100644 --- a/MdePkg/Library/BaseLib/X64/SwitchStack.asm +++ b/MdePkg/Library/BaseLib/X64/SwitchStack.asm @@ -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
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