Sync all bug fixes between EDK1.04 and EDK1.06 into EdkCompatibilityPkg.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11094 6f19259b-4bc3-4df7-8a09-765794883524

10 files changed, 246 insertions, 44 deletions

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.S b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.S
index fcf7ff44d4..dd1cb289fc 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.S
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.S
@@ -1,6 +1,6 @@
 #*****************************************************************************

 #*

-#*   Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+#*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 #*   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        

@@ -51,4 +51,26 @@ ASM_PFX(AsmFxRestore):
     ret

 #AsmFxRestore ENDP

 

+#------------------------------------------------------------------------------

+# UINTN

+# AsmGetEflags (

+#   VOID

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(AsmGetEflags):

+    pushfl

+    pop   %eax

+    ret

+#AsmGetEflags ENDP

 

+#------------------------------------------------------------------------------

+# VOID

+# AsmSetEflags (

+#   IN UINTN   Eflags

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(AsmSetEflags):

+    push  4(%esp)

+    popfl

+    ret

+#AsmSetEflags ENDP

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.asm b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.asm
index e07b52a46c..7f3f275b37 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.asm
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Fx.asm
@@ -1,6 +1,6 @@
 ;*****************************************************************************

 ;*

-;*   Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+;*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 ;*   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        

@@ -48,4 +48,28 @@ AsmFxRestore  PROC
     ret

 AsmFxRestore  ENDP

 

+;------------------------------------------------------------------------------

+; UINTN

+; AsmGetEflags (

+;   VOID

+;   );

+;------------------------------------------------------------------------------

+AsmGetEflags PROC

+    pushfd

+    pop   eax

+    ret

+AsmGetEflags ENDP

+

+;------------------------------------------------------------------------------

+; VOID

+; AsmSetEflags (

+;   IN UINTN   Eflags

+;   );

+;------------------------------------------------------------------------------

+AsmSetEflags PROC

+    push  [esp + 4]

+    popfd

+    ret

+AsmSetEflags ENDP

+

     END

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.S b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.S
index d1feb9972e..55415d8703 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.S
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.S
@@ -1,6 +1,6 @@
 #*****************************************************************************

 #*

-#*   Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>

+#*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 #*   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        

@@ -72,6 +72,9 @@ ASM_PFX(Thunk16):
     push   $0xd

     pop    %ecx

     rep movsl %ds:(%esi),%es:(%edi)   #; copy context to 16-bit stack

+    #; copy eflags to stack frame

+    mov    -12(%esi), %eax

+    mov    %eax, -72(%edi) 

     pop    %ebx                       #; ebx <- 16-bit stack offset

     mov    $L_Lable1,%eax

     stos   %eax,%es:(%edi)

@@ -140,20 +143,23 @@ ASM_PFX(RealMode):
     popw    %es

     popw    %fs

     popw    %gs

-    addw    $4, %sp                     # skip EFlags

-    testw   $1, 14(%esp)                  #(_STK16 ptr [esp + 8]).ThunkFlags, 1

+    sub     60, %esp

+    popfw

+    testw   $1, 74(%esp)                #(_STK16 ptr [esp + STACK_PARAM_SIZE + sizeof(IA32_REGS)]).ThunkFlags, 1

+

     jz      1f

-    pushf

+    pushf                               # push Flags when it's INT#

 1: 

     pushw   %cs

 #    push    @FarCallRet - _Code16Addr

     .byte   0x68                        # push /iw

     .word   FarCallRet - _Code16Addr

     jz      2f

-    ljmp    *6(%esp)                  #bugbug

+    ljmp    *66(%esp)                   #[esp + 6 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 2: 

-    ljmp    *4(%esp)                  #bugbug

+    ljmp    *64(%esp)                   #[esp + 4 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 FarCallRet: 

+    add     60, %esp

     pushfl

     pushw   %gs

     pushw   %fs

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm
index 410347764a..76c1317469 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Ia32/Thunk16.asm
@@ -1,6 +1,6 @@
 ;*****************************************************************************

 ;*

-;*   Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>

+;*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 ;*   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        

@@ -55,6 +55,8 @@ _DATA   ENDS
 

 _TEXT   SEGMENT FLAT    "CODE"  PARA

 

+STACK_PARAM_SIZE  EQU  16

+

 IA32_REGS   STRUC   4t

 _EDI        DD      ?

 _ESI        DD      ?

@@ -99,6 +101,11 @@ __Thunk16   PROC    USES    ebp ebx esi edi ds  es  fs  gs
     push    sizeof (IA32_REGS) / 4

     pop     ecx

     rep     movsd                       ; copy context to 16-bit stack

+

+    ; copy eflags to stack frame

+    mov     eax, [esi - sizeof(IA32_REGS)]._EFLAGS

+    mov     [edi - sizeof(IA32_REGS) - STACK_PARAM_SIZE - 4], eax

+

     pop     ebx                         ; ebx <- 16-bit stack offset

     mov     eax, offset @F              ; return offset

     stosd

@@ -158,20 +165,22 @@ RealMode    PROC
     pop     es

     pop     fs

     pop     gs

-    add     sp, 4                       ; skip EFlags

-    test    (_STK16 ptr [esp + 8]).ThunkFlags, 1

+    sub     esp, (sizeof(IA32_REGS) - 12) + STACK_PARAM_SIZE + 4

+    popfd

+    test    (_STK16 ptr [esp + STACK_PARAM_SIZE + sizeof(IA32_REGS)]).ThunkFlags, 1

     jz      @F

-    pushf

+    pushf                               ; push Flags when it's INT#

 @@:

     push    cs

 ;    push    @FarCallRet - _Code16Addr

     DB      68h                         ; push /iw

     DW      @FarCallRet - _Code16Addr

     jz      @F

-    jmp     fword ptr [esp + 6]

+    jmp     fword ptr [esp + 6 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 @@:

-    jmp     fword ptr [esp + 4]

+    jmp     fword ptr [esp + 4 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 @FarCallRet:

+    add     esp, (sizeof(IA32_REGS) - 12) + STACK_PARAM_SIZE + 4

     pushfd

     push    gs

     push    fs

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Thunk16Lib.h b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Thunk16Lib.h
index 8a865616c1..6c16e25e4b 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/Thunk16Lib.h
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/Thunk16Lib.h
@@ -1,6 +1,6 @@
 /*++

 

-Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 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        

@@ -237,6 +237,13 @@ Returns:
 --*/

 ;

 

+BOOLEAN

+AsmThunk16SetUserStack (

+  IN THUNK_CONTEXT             *ThunkContext,

+  IN VOID                      *Stack,

+  IN UINTN                     StackSize

+  );

+

 VOID

 EFIAPI

 AsmThunk16Destroy (

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.S b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.S
index 30c76974e2..c0807bc523 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.S
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.S
@@ -41,8 +41,30 @@ ASM_PFX(AsmFxSave):
 #   IN CONST IA32_FX_BUFFER *Buffer
 #   );
 #------------------------------------------------------------------------------
-
 ASM_PFX(AsmFxRestore):
     fxrstor (%rcx)
     retq
-    
\ No newline at end of file
+
+#------------------------------------------------------------------------------

+# UINTN

+# AsmGetEflags (

+#   VOID

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(AsmGetEflags):

+    pushfq

+    popq  %rax

+    ret

+#AsmGetEflags ENDP

+

+#------------------------------------------------------------------------------

+# VOID

+# AsmSetEflags (

+#   IN UINTN   Eflags

+#   );

+#------------------------------------------------------------------------------

+ASM_PFX(AsmSetEflags):

+    pushq  %rcx

+    popfq

+    ret

+#AsmSetEflags ENDP

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.asm b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.asm
index f9c2e4d57b..ab4a97f23a 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.asm
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Fx.asm
@@ -1,6 +1,6 @@
 ;*****************************************************************************

 ;*

-;*   Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+;*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 ;*   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        

@@ -43,4 +43,28 @@ AsmFxRestore  PROC
     ret

 AsmFxRestore  ENDP

 

+;------------------------------------------------------------------------------

+; UINTN

+; AsmGetEflags (

+;   VOID

+;   );

+;------------------------------------------------------------------------------

+AsmGetEflags PROC

+    pushfq

+    pop   rax

+    ret

+AsmGetEflags ENDP

+

+;------------------------------------------------------------------------------

+; VOID

+; AsmSetEflags (

+;   IN UINTN   Eflags

+;   );

+;------------------------------------------------------------------------------

+AsmSetEflags PROC

+    push  rcx

+    popfq

+    ret

+AsmSetEflags ENDP

+

     END

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.S b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.S
index 888801b1ab..10f3a34c19 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.S
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.S
@@ -1,6 +1,6 @@
 #*****************************************************************************

 #*

-#*   Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>

+#*   Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>

 #*   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        

@@ -106,6 +106,9 @@ ASM_PFX(Thunk16):
       pushq  $0xe                       #push    sizeof (IA32_REGS) / 4

       pop    %rcx

       rep movsl %ds:(%rsi),%es:(%rdi)

+      #; copy eflags to stack frame

+      mov    -16(%rsi), %rax

+      mov    %rax, -80(%rsi)

       pop    %rbx                       #rbx <- 16-bit stack offset

       lea    Label,%eax                 #42 <_Thunk16+0x42>

       stos   %eax,%es:(%rdi)

@@ -183,27 +186,30 @@ ASM_PFX(RealMode):
    .byte   0x07                        #pop es

     popq   %fs

     popq   %gs

-    add    $0x8,%esp                   #skip RFLAGS

-   .byte   0x67                        #test [esp + 0eh], 1

+    sub    64, %esp

+    .byte  0x66, 0x9d                  #popfd

+    add    $0x4,%esp                   #skip high part of RFLAGS

+   .byte   0x67                        #; test    (_STK16 ptr [esp + STACK_PARAM_SIZE + sizeof(IA32_REGS)]).ThunkFlags, 1

    .byte   0xf7    

    .byte   0x44

    .byte   0x24

-   .byte   0x0e

+   .byte   0x4e

    .byte   0x01

    .byte   0x00

     jz      1f

-    pushfq                             #pushf, actually

+    pushfq                             #pushf, actually, when it's INT#

 1:

    .byte   0x0e                        #push cs

    .byte   0x68                        #push /iw

    .word   FarCallRet - _Code16Addr

     jz     2f

    .byte   0x66

-    ljmp   *6(%esp)

+    ljmp   *70(%esp)

 2:    

    .byte   0x66

-    ljmp   *4(%esp)

+    ljmp   *68(%esp)

 FarCallRet: 

+    add    64, %esp

    .byte   0x66

     push   $0x00                       #push a dword of zero

    .byte   0x66

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.asm b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.asm
index b6a8f86879..0638d5faa8 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.asm
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X64/Thunk16.asm
@@ -1,6 +1,6 @@
 ;*****************************************************************************

 ;*

-;*   Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+;*   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 ;*   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        

@@ -49,6 +49,8 @@ _16Gdtr         LABEL   FWORD
 

     .code

 

+STACK_PARAM_SIZE  EQU  16

+

 IA32_REGS   STRUC   4t

 _EDI        DD      ?

 _ESI        DD      ?

@@ -98,6 +100,11 @@ _Thunk16    PROC    USES    rbp rbx rsi rdi r12 r13 r14 r15
     push    sizeof (IA32_REGS) / 4

     pop     rcx

     rep     movsd

+

+    ; copy eflags to stack frame

+    mov     rax, (IA32_REGS ptr [rsi - sizeof(IA32_REGS)])._RFLAGS

+    mov     [rdi - sizeof(IA32_REGS) - STACK_PARAM_SIZE - 8], rax

+

     pop     rbx                         ; rbx <- 16-bit stack offset

     lea     eax, @F                     ; return offset

     stosd

@@ -165,22 +172,27 @@ RealMode    PROC
     DB      7                           ; pop es

     pop     fs

     pop     gs

+    sub     esp, (sizeof(IA32_REGS) - 16) + STACK_PARAM_SIZE + 8

 

-    add     esp, 8                      ; skip RFLAGS

-    DB      67h, 0f7h, 44h, 24h, 0eh, 1, 0  ; test [esp + 0eh], 1

+    DB      66h, 9Dh                    ; popfd

+    add     esp, 4                      ; skip high part of RFLAGS

+    DB      67h, 0f7h, 44h, 24h         ; test    (_STK16 ptr [esp + STACK_PARAM_SIZE + sizeof(IA32_REGS)]).ThunkFlags, 1

+    DB      (STACK_PARAM_SIZE + sizeof(IA32_REGS) + 6)

+    DB      1, 0

     jz      @F

-    pushfq                              ; pushf, actually

+    pushfq                              ; pushf, actually, when it's INT#

 @@:

     DB      0eh                         ; push cs

     DB      68h                         ; push /iw

     DW      @FarCallRet - _Code16Addr

     jz      @F

     DB      66h

-    jmp     fword ptr [esp + 6]

+    jmp     fword ptr [esp + 6 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 @@:

     DB      66h

-    jmp     fword ptr [esp + 4]

+    jmp     fword ptr [esp + 4 + STACK_PARAM_SIZE + sizeof(IA32_REGS) - 8]

 @FarCallRet:

+    add     esp, (sizeof(IA32_REGS) - 16) + STACK_PARAM_SIZE + 8

     DB      66h

     push    0                           ; push a dword of zero

     pushf                               ; pushfd, actually

diff --git a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X86Thunk.c b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X86Thunk.c
index c9aafd36aa..ed24663b48 100644
--- a/EdkCompatibilityPkg/Foundation/Library/Thunk16/X86Thunk.c
+++ b/EdkCompatibilityPkg/Foundation/Library/Thunk16/X86Thunk.c
@@ -1,6 +1,6 @@
 /*++

 

-Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>

 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        

@@ -53,6 +53,18 @@ AsmFxSave (
   OUT IA32_FX_BUFFER *Buffer

   );

 

+UINTN

+EFIAPI

+AsmGetEflags (

+  VOID

+  );

+

+VOID

+EFIAPI

+AsmSetEflags (

+  IN UINTN   Eflags

+  );

+

 //

 // Implementation

 //

@@ -98,6 +110,7 @@ Returns:
 {

   IA32_FX_BUFFER                    *FpSavedState;

   UINT8                             FpBuffer[sizeof (*FpSavedState) + 0x10];

+  UINTN                             Eflags;

 

   FpSavedState = (IA32_FX_BUFFER*)(((UINTN)FpBuffer + 0xf) & ~0xf);

 

@@ -110,6 +123,8 @@ Returns:
     AsmFxSave (FpSavedState);

   }

 

+  Eflags = AsmGetEflags ();

+

   EfiCommonLibCopyMem (

     RegisterSet,

     _Thunk16 (

@@ -120,6 +135,8 @@ Returns:
     sizeof (*RegisterSet)

     );

 

+   AsmSetEflags (Eflags);

+

   if (ThunkFlags & THUNK_SAVE_FP_STATE) {

     AsmFxRestore (FpSavedState);

   }

@@ -200,6 +217,67 @@ Returns:
   return ThunkContext;

 }

 

+#pragma pack (1)

+

+typedef struct {

+  UINT32                            EDI;

+  UINT32                            ESI;

+  UINT32                            EBP;

+  UINT32                            ESP;

+  UINT32                            EBX;

+  UINT32                            EDX;

+  UINT32                            ECX;

+  UINT32                            EAX;

+  UINT16                            DS;

+  UINT16                            ES;

+  UINT16                            FS;

+  UINT16                            GS;

+  UINTN                             EFLAGS;

+  UINT32                            EIP;

+  UINT16                            CS;

+  UINT16                            SS;

+} IA32_REGS;

+

+typedef struct {

+  UINT16  Limit;

+  UINT32  Base;

+} IA32_DESC;

+

+typedef struct {

+  UINT32    RetEip;

+  UINT16    RetCs;

+  UINT16    ThunkFlags;

+#ifdef EFI32

+  UINT32    SavedEsp;

+  UINT16    SavedSs;

+#endif

+  IA32_DESC SavedGdtr;

+#ifdef EFIX64

+  UINT16    Resvd1;

+#endif

+  UINT32    SavedCr0;

+  UINT32    SavedCr4;

+} _STK16;

+#pragma pack ()

+

+#define STACK_PARAM_SIZE  16

+

+BOOLEAN

+AsmThunk16SetUserStack (

+  IN THUNK_CONTEXT             *ThunkContext,

+  IN VOID                      *Stack,

+  IN UINTN                     StackSize

+  )

+{

+  if (StackSize > STACK_PARAM_SIZE) {

+    return FALSE;

+  }

+

+  EfiCommonLibCopyMem ((VOID *)(UINTN)(ThunkContext->DefaultStack - sizeof(_STK16) - sizeof(IA32_REGS) - STACK_PARAM_SIZE), Stack, StackSize);

+

+  return TRUE;

+}

+

 VOID

 EFIAPI

 AsmThunk16Destroy (

@@ -253,12 +331,8 @@ Arguments:
                   set on input, otherwise ignored.

                   EFlages is ignored on input.

                   On output, values of CS, EIP, SS and ESP should be ignored.

-  ThunkFlags    - 2 flags have currently been defined, THUNK_SAVE_FP_STATE and

-                  THUNK_USER_STACK.

-                  THUNK_SAVE_FP_STATE - FPU state would be saved/restored

-                                        before/after calling real mode code.

-                  THUNK_USER_STACK    - The stack specified by SS:ESP would be

-                                        used instead of the default stack.

+  ThunkFlags    - THUNK_USER_STACK: The stack specified by SS:ESP would be

+                  used instead of the default stack.

 

 Returns:

 

@@ -298,12 +372,8 @@ Arguments:
                   set on input, otherwise ignored.

                   EFlages is ignored on input.

                   On output, values of CS, EIP, SS and ESP should be ignored.

-  ThunkFlags    - 2 flags have currently been defined, THUNK_SAVE_FP_STATE and

-                  THUNK_USER_STACK.

-                  THUNK_SAVE_FP_STATE - FPU state would be saved/restored

-                                        before/after calling real mode code.

-                  THUNK_USER_STACK    - The stack specified by SS:ESP would be

-                                        used instead of the default stack.

+  ThunkFlags    - THUNK_USER_STACK: The stack specified by SS:ESP would be

+                  used instead of the default stack.

 

 Returns: