1 | ; $Id: VMMR0A.asm 5999 2007-12-07 15:05:06Z vboxsync $
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2 | ;; @file
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3 | ; VMM - R0 assembly routines.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2007 innotek GmbH
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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 |
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18 | ;*******************************************************************************
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19 | ;* Header Files *
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20 | ;*******************************************************************************
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21 | %include "VBox/asmdefs.mac"
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22 | %include "VMMInternal.mac"
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23 | %include "iprt/err.mac"
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24 |
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25 |
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26 | %ifdef RT_ARCH_X86 ; The other architecture(s) use(s) C99 variadict macros.
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27 | extern IMPNAME(RTLogLogger)
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28 | %endif
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29 |
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30 |
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31 | BEGINCODE
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32 |
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33 |
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34 | ;;
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35 | ; The setjmp variant used for calling Ring-3.
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36 | ;
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37 | ; This differs from the normal setjmp in that it will resume VMMR0CallHost if we're
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38 | ; in the middle of a ring-3 call. Another differences is the function pointer and
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39 | ; argument. This has to do with resuming code and the stack frame of the caller.
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40 | ;
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41 | ; @returns VINF_SUCCESS on success or whatever is passed to vmmR0CallHostLongJmp.
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42 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[esp+4] Our jmp_buf.
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43 | ; @param pfn msc:rdx gcc:rsi x86:[esp+8] The function to be called when not resuming.
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44 | ; @param pvUser msc:r8 gcc:rdx x86:[esp+c] The argument of that function.
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45 | ;
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46 | BEGINPROC vmmR0CallHostSetJmp
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47 | GLOBALNAME vmmR0CallHostSetJmpEx
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48 | %ifdef RT_ARCH_X86
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49 | ;
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50 | ; Save the registers.
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51 | ;
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52 | mov edx, [esp + 4h] ; pJmpBuf
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53 | mov [edx + VMMR0JMPBUF.ebx], ebx
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54 | mov [edx + VMMR0JMPBUF.esi], esi
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55 | mov [edx + VMMR0JMPBUF.edi], edi
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56 | mov [edx + VMMR0JMPBUF.ebp], ebp
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57 | mov eax, [esp]
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58 | mov [edx + VMMR0JMPBUF.eip], eax
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59 | lea ecx, [esp + 4] ; (used in resume)
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60 | mov [edx + VMMR0JMPBUF.esp], ecx
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61 |
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62 | ;
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63 | ; If we're not in a ring-3 call, call pfn and return.
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64 | ;
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65 | test byte [edx + VMMR0JMPBUF.fInRing3Call], 1
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66 | jnz .resume
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67 |
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68 | mov ecx, [esp + 0ch] ; pvArg
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69 | mov eax, [esp + 08h] ; pfn
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70 | sub esp, 12 ; align the stack on a 16-byte boundrary.
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71 | mov [esp], ecx
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72 | call eax
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73 | add esp, 12
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74 | mov edx, [esp + 4h] ; pJmpBuf
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75 | and dword [edx + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
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76 | ret
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77 |
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78 | ;
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79 | ; Resume VMMR0CallHost the call.
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80 | ;
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81 | .resume:
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82 | ; Sanity checks.
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83 | cmp ecx, [edx + VMMR0JMPBUF.SpCheck]
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84 | je .espCheck_ok
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85 | .bad:
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86 | and dword [edx + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
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87 | mov edi, [edx + VMMR0JMPBUF.edi]
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88 | mov esi, [edx + VMMR0JMPBUF.esi]
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89 | mov ebx, [edx + VMMR0JMPBUF.ebx]
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90 | mov eax, VERR_INTERNAL_ERROR ; todo better return code!
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91 | ret
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92 |
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93 | .espCheck_ok:
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94 | mov ecx, [edx + VMMR0JMPBUF.cbSavedStack]
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95 | cmp ecx, 8192
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96 | ja .bad
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97 | test ecx, 3
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98 | jnz .bad
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99 | mov edi, [edx + VMMR0JMPBUF.esp]
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100 | sub edi, [edx + VMMR0JMPBUF.SpResume]
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101 | cmp ecx, edi
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102 | jne .bad
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103 |
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104 | ;
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105 | ; Restore the stack.
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106 | ;
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107 | mov byte [edx + VMMR0JMPBUF.fInRing3Call], 0
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108 | mov ecx, [edx + VMMR0JMPBUF.cbSavedStack]
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109 | shr ecx, 2
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110 | mov esi, [edx + VMMR0JMPBUF.pvSavedStack]
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111 | mov edi, [edx + VMMR0JMPBUF.SpResume]
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112 | mov esp, edi
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113 | rep movsd
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114 |
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115 | ;
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116 | ; Continue where we left off.
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117 | ;
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118 | popf
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119 | pop ebx
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120 | pop esi
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121 | pop edi
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122 | pop ebp
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123 | xor eax, eax ; VINF_SUCCESS
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124 | ret
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125 | %endif ; RT_ARCH_X86
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126 |
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127 | %ifdef RT_ARCH_AMD64
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128 | ;
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129 | ; Save the registers.
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130 | ;
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131 | push rbp
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132 | mov rbp, rsp
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133 | %ifdef ASM_CALL64_MSC
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134 | sub rsp, 30h
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135 | mov r11, rdx ; pfn
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136 | mov rdx, rcx ; pJmpBuf;
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137 | %else
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138 | sub rsp, 10h
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139 | mov r8, rdx ; pvUser (save it like MSC)
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140 | mov r11, rsi ; pfn
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141 | mov rdx, rdi ; pJmpBuf
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142 | %endif
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143 | mov [rdx + VMMR0JMPBUF.rbx], rbx
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144 | %ifdef ASM_CALL64_MSC
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145 | mov [rdx + VMMR0JMPBUF.rsi], rsi
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146 | mov [rdx + VMMR0JMPBUF.rdi], rdi
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147 | %endif
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148 | mov r10, [rbp]
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149 | mov [rdx + VMMR0JMPBUF.rbp], r10
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150 | mov [rdx + VMMR0JMPBUF.r12], r12
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151 | mov [rdx + VMMR0JMPBUF.r13], r13
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152 | mov [rdx + VMMR0JMPBUF.r14], r14
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153 | mov [rdx + VMMR0JMPBUF.r15], r15
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154 | mov rax, [rbp + 8]
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155 | mov [rdx + VMMR0JMPBUF.rip], rax
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156 | lea r10, [rbp + 10h] ; (used in resume)
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157 | mov [rdx + VMMR0JMPBUF.rsp], r10
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158 |
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159 | ;
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160 | ; If we're not in a ring-3 call, call pfn and return.
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161 | ;
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162 | test byte [rdx + VMMR0JMPBUF.fInRing3Call], 1
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163 | jnz .resume
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164 |
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165 | mov [rbp - 8], rdx ; Save it and fix stack alignment (16).
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166 | %ifdef ASM_CALL64_MSC
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167 | mov rcx, r8 ; pvUser -> arg0
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168 | %else
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169 | mov rdi, r8 ; pvUser -> arg0
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170 | %endif
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171 | call r11
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172 | mov rdx, [rbp - 8] ; pJmpBuf
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173 | and qword [rdx + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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174 | leave
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175 | ret
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176 |
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177 | ;
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178 | ; Resume VMMR0CallHost the call.
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179 | ;
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180 | .resume:
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181 | ; Sanity checks.
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182 | cmp r10, [rdx + VMMR0JMPBUF.SpCheck]
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183 | je .rspCheck_ok
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184 | .bad:
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185 | and qword [rdx + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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186 | mov rbx, [rdx + VMMR0JMPBUF.rbx]
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187 | %ifdef ASM_CALL64_MSC
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188 | mov rsi, [rdx + VMMR0JMPBUF.rsi]
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189 | mov rdi, [rdx + VMMR0JMPBUF.rdi]
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190 | %endif
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191 | mov r12, [rdx + VMMR0JMPBUF.r12]
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192 | mov r13, [rdx + VMMR0JMPBUF.r13]
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193 | mov r14, [rdx + VMMR0JMPBUF.r14]
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194 | mov r15, [rdx + VMMR0JMPBUF.r15]
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195 | mov eax, VERR_INTERNAL_ERROR ; todo better return code!
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196 | leave
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197 | ret
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198 |
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199 | .rspCheck_ok:
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200 | mov ecx, [rdx + VMMR0JMPBUF.cbSavedStack]
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201 | cmp rcx, 8192
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202 | ja .bad
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203 | test rcx, 3
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204 | jnz .bad
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205 | mov rdi, [rdx + VMMR0JMPBUF.rsp]
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206 | sub rdi, [rdx + VMMR0JMPBUF.SpResume]
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207 | cmp rcx, rdi
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208 | jne .bad
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209 |
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210 | ;
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211 | ; Restore the stack.
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212 | ;
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213 | mov byte [rdx + VMMR0JMPBUF.fInRing3Call], 0
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214 | mov ecx, [rdx + VMMR0JMPBUF.cbSavedStack]
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215 | shr ecx, 3
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216 | mov rsi, [rdx + VMMR0JMPBUF.pvSavedStack]
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217 | mov rdi, [rdx + VMMR0JMPBUF.SpResume]
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218 | mov rsp, rdi
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219 | rep movsq
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220 |
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221 | ;
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222 | ; Continue where we left off.
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223 | ;
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224 | popf
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225 | pop rbx
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226 | %ifdef ASM_CALL64_MSC
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227 | pop rsi
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228 | pop rdi
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229 | %endif
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230 | pop r12
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231 | pop r13
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232 | pop r14
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233 | pop r15
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234 | pop rbp
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235 | xor eax, eax ; VINF_SUCCESS
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236 | ret
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237 | %endif
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238 | ENDPROC vmmR0CallHostSetJmp
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239 |
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240 |
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241 | ;;
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242 | ; Worker for VMMR0CallHost.
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243 | ; This will save the stack and registers.
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244 | ;
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245 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[ebp+8] Pointer to the jump buffer.
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246 | ; @param rc msc:rdx gcc:rsi x86:[ebp+c] The return code.
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247 | ;
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248 | BEGINPROC vmmR0CallHostLongJmp
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249 | %ifdef RT_ARCH_X86
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250 | ;
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251 | ; Save the registers on the stack.
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252 | ;
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253 | push ebp
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254 | mov ebp, esp
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255 | push edi
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256 | push esi
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257 | push ebx
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258 | pushf
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259 |
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260 | ;
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261 | ; Load parameters.
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262 | ;
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263 | mov edx, [ebp + 08h] ; pJmpBuf
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264 | mov eax, [ebp + 0ch] ; rc
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265 |
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266 | ;
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267 | ; Is the jump buffer armed?
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268 | ;
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269 | cmp dword [edx + VMMR0JMPBUF.eip], byte 0
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270 | je .nok
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271 |
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272 | ;
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273 | ; Save the stack.
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274 | ;
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275 | mov edi, [edx + VMMR0JMPBUF.pvSavedStack]
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276 | mov [edx + VMMR0JMPBUF.SpResume], esp
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277 | mov esi, esp
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278 | mov ecx, [edx + VMMR0JMPBUF.esp]
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279 | sub ecx, esi
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280 |
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281 | ; two sanity checks on the size.
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282 | cmp ecx, 8192 ; check max size.
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283 | jbe .ok
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284 | .nok:
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285 | mov eax, VERR_INTERNAL_ERROR
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286 | popf
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287 | pop ebx
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288 | pop esi
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289 | pop edi
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290 | leave
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291 | ret
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292 | .ok:
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293 | test ecx, 3 ; check alignment
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294 | jnz .nok
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295 | mov [edx + VMMR0JMPBUF.cbSavedStack], ecx
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296 | shr ecx, 2
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297 | rep movsd
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298 |
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299 | ; store the last pieces of info.
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300 | mov ecx, [edx + VMMR0JMPBUF.esp]
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301 | mov [edx + VMMR0JMPBUF.SpCheck], ecx
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302 | mov byte [edx + VMMR0JMPBUF.fInRing3Call], 1
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303 |
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304 | ;
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305 | ; Do the long jump.
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306 | ;
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307 | mov ebx, [edx + VMMR0JMPBUF.ebx]
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308 | mov esi, [edx + VMMR0JMPBUF.esi]
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309 | mov edi, [edx + VMMR0JMPBUF.edi]
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310 | mov ebp, [edx + VMMR0JMPBUF.ebp]
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311 | mov ecx, [edx + VMMR0JMPBUF.eip]
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312 | mov esp, [edx + VMMR0JMPBUF.esp]
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313 | jmp ecx
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314 | %endif ; RT_ARCH_X86
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315 |
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316 | %ifdef RT_ARCH_AMD64
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317 | ;
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318 | ; Save the registers on the stack.
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319 | ;
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320 | push rbp
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321 | mov rbp, rsp
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322 | push r15
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323 | push r14
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324 | push r13
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325 | push r12
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326 | %ifdef ASM_CALL64_MSC
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327 | push rdi
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328 | push rsi
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329 | %endif
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330 | push rbx
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331 | pushf
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332 |
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333 | ;
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334 | ; Normalize the parameters.
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335 | ;
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336 | %ifdef ASM_CALL64_MSC
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337 | mov eax, edx ; rc
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338 | mov rdx, rcx ; pJmpBuf
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339 | %else
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340 | mov rdx, rdi ; pJmpBuf
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341 | mov eax, esi ; rc
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342 | %endif
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343 |
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344 | ;
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345 | ; Is the jump buffer armed?
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346 | ;
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347 | cmp qword [rdx + VMMR0JMPBUF.rip], byte 0
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348 | je .nok
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349 |
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350 | ;
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351 | ; Save the stack.
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352 | ;
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353 | mov rdi, [rdx + VMMR0JMPBUF.pvSavedStack]
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354 | mov [rdx + VMMR0JMPBUF.SpResume], rsp
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355 | mov rsi, rsp
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356 | mov rcx, [rdx + VMMR0JMPBUF.rsp]
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357 | sub rcx, rsi
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358 |
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359 | ; two sanity checks on the size.
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360 | cmp rcx, 8192 ; check max size.
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361 | jbe .ok
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362 | .nok:
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363 | mov eax, VERR_INTERNAL_ERROR
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364 | popf
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365 | pop rbx
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366 | %ifdef ASM_CALL64_MSC
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367 | pop rsi
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368 | pop rdi
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369 | %endif
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370 | pop r12
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371 | pop r13
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372 | pop r14
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373 | pop r15
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374 | leave
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375 | ret
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376 |
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377 | .ok:
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378 | test ecx, 7 ; check alignment
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379 | jnz .nok
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380 | mov [rdx + VMMR0JMPBUF.cbSavedStack], ecx
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381 | shr ecx, 3
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382 | rep movsq
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383 |
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384 | ; store the last pieces of info.
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385 | mov rcx, [rdx + VMMR0JMPBUF.rsp]
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386 | mov [rdx + VMMR0JMPBUF.SpCheck], rcx
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387 | mov byte [rdx + VMMR0JMPBUF.fInRing3Call], 1
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388 |
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389 | ;
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390 | ; Do the long jump.
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391 | ;
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392 | mov rbx, [rdx + VMMR0JMPBUF.rbx]
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393 | %ifdef ASM_CALL64_MSC
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394 | mov rsi, [rdx + VMMR0JMPBUF.rsi]
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395 | mov rdi, [rdx + VMMR0JMPBUF.rdi]
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396 | %endif
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397 | mov r12, [rdx + VMMR0JMPBUF.r12]
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398 | mov r13, [rdx + VMMR0JMPBUF.r13]
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399 | mov r14, [rdx + VMMR0JMPBUF.r14]
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400 | mov r15, [rdx + VMMR0JMPBUF.r15]
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401 | mov rbp, [rdx + VMMR0JMPBUF.rbp]
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402 | mov rcx, [rdx + VMMR0JMPBUF.rip]
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403 | mov rsp, [rdx + VMMR0JMPBUF.rsp]
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404 | jmp rcx
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405 | %endif
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406 | ENDPROC vmmR0CallHostLongJmp
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407 |
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408 |
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409 | ;;
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410 | ; Internal R0 logger worker: Logger wrapper.
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411 | ;
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412 | ; @cproto VMMR0DECL(void) vmmR0LoggerWrapper(const char *pszFormat, ...)
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413 | ;
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414 | EXPORTEDNAME vmmR0LoggerWrapper
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415 | %ifdef RT_ARCH_X86 ; The other architecture(s) use(s) C99 variadict macros.
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416 | push 0 ; assumes we're the wrapper for a default instance.
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417 | call IMP(RTLogLogger)
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418 | add esp, byte 4
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419 | ret
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420 | %else
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421 | int3
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422 | int3
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423 | int3
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424 | ret
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425 | %endif
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426 | ENDPROC vmmR0LoggerWrapper
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427 |
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