; $Id: bs3-cmn-TrapSetJmp.asm 76553 2019-01-01 01:45:53Z vboxsync $ ;; @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