1 | ; $Id: bs3-cmn-TrapSetJmp.asm 82968 2020-02-04 10:35:17Z vboxsync $
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2 | ;; @file
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3 | ; BS3Kit - Bs3TrapSetJmp.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2007-2020 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 |
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28 | ;*********************************************************************************************************************************
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29 | ;* Header Files *
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30 | ;*********************************************************************************************************************************
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31 | %include "bs3kit-template-header.mac"
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32 |
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33 |
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34 | ;*********************************************************************************************************************************
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35 | ;* External Symbols *
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36 | ;*********************************************************************************************************************************
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37 | BS3_EXTERN_CMN Bs3RegCtxSave
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38 | %if TMPL_BITS == 16
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39 | BS3_EXTERN_CMN_FAR Bs3SelFar32ToFlat32
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40 | %endif
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41 | BS3_EXTERN_DATA16 g_Bs3TrapSetJmpCtx
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42 | BS3_EXTERN_DATA16 g_pBs3TrapSetJmpFrame
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43 | TMPL_BEGIN_TEXT
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44 |
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45 |
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46 | ;;
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47 | ; Sets up a one-shot set-jmp-on-trap.
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48 | ;
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49 | ; @uses See, applicable C calling convention.
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50 | ;
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51 | BS3_PROC_BEGIN_CMN Bs3TrapSetJmp, BS3_PBC_HYBRID
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52 | BS3_CALL_CONV_PROLOG 1
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53 | push xBP
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54 | mov xBP, xSP
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55 | push xBX
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56 | BONLY64 sub xSP, 20h
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57 |
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58 | ;
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59 | ; Save the current register context.
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60 | ;
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61 | BONLY16 push ds
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62 | BS3_LEA_MOV_WRT_RIP(xAX, BS3_DATA16_WRT(g_Bs3TrapSetJmpCtx))
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63 | push xAX
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64 | BS3_CALL Bs3RegCtxSave, 1
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65 | add xSP, sCB
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66 |
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67 | ;
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68 | ; Adjust the return context a little.
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69 | ;
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70 | BS3_LEA_MOV_WRT_RIP(xBX, BS3_DATA16_WRT(g_Bs3TrapSetJmpCtx))
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71 | mov xAX, [xBP + xCB] ; The return address of this function
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72 | mov [xBX + BS3REGCTX.rip], xAX
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73 | %if TMPL_BITS == 16
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74 | mov xAX, [xBP + xCB+2] ; The return address CS of this function.
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75 | mov [xBX + BS3REGCTX.cs], xAX
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76 | %endif
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77 | mov xAX, [xBP]
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78 | mov [xBX + BS3REGCTX.rbp], xAX
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79 | lea xAX, [xBP + xCB + cbCurRetAddr]
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80 | mov [xBX + BS3REGCTX.rsp], xAX
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81 | mov xAX, [xBP - xCB]
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82 | mov [xBX + BS3REGCTX.rbx], xAX
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83 | xor xAX, xAX
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84 | mov [xBX + BS3REGCTX.rax], xAX ; the return value.
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85 |
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86 | ;
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87 | ; Fill the trap frame return structure.
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88 | ;
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89 | push xDI
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90 | %if TMPL_BITS == 16
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91 | push es
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92 | les di, [xBP + xCB + cbCurRetAddr]
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93 | mov cx, BS3TRAPFRAME_size / 2
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94 | mov ax, 0faceh
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95 | rep stosw
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96 | pop es
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97 | %else
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98 | mov xDI, [xBP + xCB*2]
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99 | mov ecx, BS3TRAPFRAME_size / 4
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100 | mov xAX, 0feedfaceh
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101 | rep stosd
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102 | %endif
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103 | pop xDI
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104 |
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105 | ;
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106 | ; Save the (flat) pointer to the trap frame return structure.
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107 | ;
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108 | %if TMPL_BITS == 16
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109 | xor ax, ax
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110 | push word [xBP + xCB + cbCurRetAddr + 2]
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111 | push ax
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112 | push word [xBP + xCB + cbCurRetAddr]
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113 | push cs
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114 | call Bs3SelFar32ToFlat32
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115 | add sp, 6h
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116 | mov [BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], ax
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117 | mov [2 + BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], dx
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118 | %else
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119 | mov xAX, [xBP + xCB*2]
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120 | mov [BS3_DATA16_WRT(g_pBs3TrapSetJmpFrame)], eax
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121 | %endif
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122 |
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123 | ;
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124 | ; Return 'true'.
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125 | ;
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126 | mov xAX, 1
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127 | BONLY64 add xSP, 20h
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128 | pop xBX
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129 | pop xBP
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130 | BS3_CALL_CONV_EPILOG 1
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131 | BS3_HYBRID_RET
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132 | BS3_PROC_END_CMN Bs3TrapSetJmp
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133 |
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