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; $Id: bs3-cmn-TrapSetJmp.asm $
;; @file
; BS3Kit - Bs3TrapSetJmp.
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
BS3_EXTERN_CMN Bs3RegCtxSave
%if TMPL_BITS == 16
BS3_EXTERN_CMN_FAR Bs3SelFar32ToFlat32
%endif
BS3_EXTERN_DATA16 g_Bs3TrapSetJmpCtx
BS3_EXTERN_DATA16 g_pBs3TrapSetJmpFrame
TMPL_BEGIN_TEXT
;;
; Sets up a one-shot set-jmp-on-trap.
;
; @uses See, applicable C calling convention.
;
BS3_PROC_BEGIN_CMN Bs3TrapSetJmp, BS3_PBC_HYBRID
BS3_CALL_CONV_PROLOG 1
push xBP
mov xBP, xSP
push xBX
BONLY64 sub xSP, 20h
;
; Save the current register context.
;
BONLY16 push ds
BS3_LEA_MOV_WRT_RIP(xAX, BS3_DATA16_WRT(g_Bs3TrapSetJmpCtx))
push xAX
BS3_CALL Bs3RegCtxSave, 1
add xSP, sCB
;
; Adjust the return context a little.
;
BS3_LEA_MOV_WRT_RIP(xBX, BS3_DATA16_WRT(g_Bs3TrapSetJmpCtx))
mov xAX, [xBP + xCB] ; The return address of this function
mov [xBX + BS3REGCTX.rip], xAX
%if TMPL_BITS == 16
mov xAX, [xBP + xCB+2] ; The return address CS of this function.
mov [xBX + BS3REGCTX.cs], xAX
%endif
mov xAX, [xBP]
mov [xBX + BS3REGCTX.rbp], xAX
lea xAX, [xBP + xCB + cbCurRetAddr]
mov [xBX + BS3REGCTX.rsp], xAX
mov xAX, [xBP - xCB]
mov [xBX + BS3REGCTX.rbx], xAX
xor xAX, xAX
mov [xBX + BS3REGCTX.rax], xAX ; the return value.
;
; Fill the trap frame return structure.
;
push xDI
%if TMPL_BITS == 16
push es
les di, [xBP + xCB + cbCurRetAddr]
mov cx, BS3TRAPFRAME_size / 2
mov ax, 0faceh
rep stosw
pop es
%else
mov xDI, [xBP + xCB*2]
mov ecx, BS3TRAPFRAME_size / 4
mov xAX, 0feedfaceh
rep stosd
%endif
pop xDI
;
; Save the (flat) pointer to the trap frame return structure.
;
%if TMPL_BITS == 16
xor ax, ax
push word [xBP + xCB + cbCurRetAddr + 2]
push ax
push word [xBP + xCB + cbCurRetAddr]
push cs
call Bs3SelFar32ToFlat32
add sp, 6h
mov [BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], ax
mov [2 + BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], dx
%else
mov xAX, [xBP + xCB*2]
mov [BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], eax
%endif
;
; Return 'true'.
;
mov xAX, 1
BONLY64 add xSP, 20h
pop xBX
pop xBP
BS3_CALL_CONV_EPILOG 1
BS3_HYBRID_RET
BS3_PROC_END_CMN Bs3TrapSetJmp
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