1 | ; $Id: VMMR0A.asm 7507 2008-03-20 14:16:51Z 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 |
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76 | ; restore the registers that we're not allowed to modify
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77 | ; otherwise a resume might restore the wrong values (from the previous run)
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78 | mov edi, [edx + VMMR0JMPBUF.edi]
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79 | mov esi, [edx + VMMR0JMPBUF.esi]
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80 | mov ebx, [edx + VMMR0JMPBUF.ebx]
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81 | mov ebp, [edx + VMMR0JMPBUF.ebp]
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82 |
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83 | and dword [edx + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
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84 | ret
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85 |
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86 | ;
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87 | ; Resume VMMR0CallHost the call.
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88 | ;
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89 | .resume:
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90 | ; Sanity checks.
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91 | cmp ecx, [edx + VMMR0JMPBUF.SpCheck]
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92 | je .espCheck_ok
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93 | .bad:
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94 | and dword [edx + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
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95 | mov edi, [edx + VMMR0JMPBUF.edi]
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96 | mov esi, [edx + VMMR0JMPBUF.esi]
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97 | mov ebx, [edx + VMMR0JMPBUF.ebx]
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98 | mov eax, VERR_INTERNAL_ERROR ; todo better return code!
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99 | ret
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100 |
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101 | .espCheck_ok:
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102 | mov ecx, [edx + VMMR0JMPBUF.cbSavedStack]
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103 | cmp ecx, 8192
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104 | ja .bad
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105 | test ecx, 3
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106 | jnz .bad
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107 | mov edi, [edx + VMMR0JMPBUF.esp]
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108 | sub edi, [edx + VMMR0JMPBUF.SpResume]
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109 | cmp ecx, edi
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110 | jne .bad
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111 |
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112 | ;
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113 | ; Restore the stack.
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114 | ;
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115 | mov byte [edx + VMMR0JMPBUF.fInRing3Call], 0
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116 | mov ecx, [edx + VMMR0JMPBUF.cbSavedStack]
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117 | shr ecx, 2
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118 | mov esi, [edx + VMMR0JMPBUF.pvSavedStack]
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119 | mov edi, [edx + VMMR0JMPBUF.SpResume]
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120 | mov esp, edi
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121 | rep movsd
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122 |
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123 | ;
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124 | ; Continue where we left off.
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125 | ;
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126 | popf
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127 | pop ebx
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128 | pop esi
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129 | pop edi
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130 | pop ebp
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131 | xor eax, eax ; VINF_SUCCESS
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132 | ret
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133 | %endif ; RT_ARCH_X86
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134 |
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135 | %ifdef RT_ARCH_AMD64
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136 | ;
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137 | ; Save the registers.
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138 | ;
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139 | push rbp
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140 | mov rbp, rsp
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141 | %ifdef ASM_CALL64_MSC
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142 | sub rsp, 30h
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143 | mov r11, rdx ; pfn
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144 | mov rdx, rcx ; pJmpBuf;
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145 | %else
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146 | sub rsp, 10h
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147 | mov r8, rdx ; pvUser (save it like MSC)
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148 | mov r11, rsi ; pfn
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149 | mov rdx, rdi ; pJmpBuf
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150 | %endif
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151 | mov [rdx + VMMR0JMPBUF.rbx], rbx
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152 | %ifdef ASM_CALL64_MSC
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153 | mov [rdx + VMMR0JMPBUF.rsi], rsi
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154 | mov [rdx + VMMR0JMPBUF.rdi], rdi
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155 | %endif
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156 | mov r10, [rbp]
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157 | mov [rdx + VMMR0JMPBUF.rbp], r10
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158 | mov [rdx + VMMR0JMPBUF.r12], r12
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159 | mov [rdx + VMMR0JMPBUF.r13], r13
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160 | mov [rdx + VMMR0JMPBUF.r14], r14
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161 | mov [rdx + VMMR0JMPBUF.r15], r15
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162 | mov rax, [rbp + 8]
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163 | mov [rdx + VMMR0JMPBUF.rip], rax
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164 | lea r10, [rbp + 10h] ; (used in resume)
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165 | mov [rdx + VMMR0JMPBUF.rsp], r10
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166 |
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167 | ;
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168 | ; If we're not in a ring-3 call, call pfn and return.
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169 | ;
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170 | test byte [rdx + VMMR0JMPBUF.fInRing3Call], 1
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171 | jnz .resume
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172 |
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173 | mov [rbp - 8], rdx ; Save it and fix stack alignment (16).
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174 | %ifdef ASM_CALL64_MSC
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175 | mov rcx, r8 ; pvUser -> arg0
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176 | %else
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177 | mov rdi, r8 ; pvUser -> arg0
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178 | %endif
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179 | call r11
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180 | mov rdx, [rbp - 8] ; pJmpBuf
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181 |
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182 | ; restore the registers that we're not allowed to modify
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183 | ; otherwise a resume might restore the wrong values (from the previous run)
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184 | mov rbx, [rdx + VMMR0JMPBUF.rbx]
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185 | %ifdef ASM_CALL64_MSC
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186 | mov rsi, [rdx + VMMR0JMPBUF.rsi]
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187 | mov rdi, [rdx + VMMR0JMPBUF.rdi]
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188 | %endif
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189 | mov r12, [rdx + VMMR0JMPBUF.r12]
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190 | mov r13, [rdx + VMMR0JMPBUF.r13]
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191 | mov r14, [rdx + VMMR0JMPBUF.r14]
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192 | mov r15, [rdx + VMMR0JMPBUF.r15]
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193 |
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194 | and qword [rdx + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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195 | leave
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196 | ret
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197 |
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198 | ;
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199 | ; Resume VMMR0CallHost the call.
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200 | ;
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201 | .resume:
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202 | ; Sanity checks.
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203 | cmp r10, [rdx + VMMR0JMPBUF.SpCheck]
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204 | je .rspCheck_ok
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205 | .bad:
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206 | and qword [rdx + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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207 | mov rbx, [rdx + VMMR0JMPBUF.rbx]
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208 | %ifdef ASM_CALL64_MSC
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209 | mov rsi, [rdx + VMMR0JMPBUF.rsi]
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210 | mov rdi, [rdx + VMMR0JMPBUF.rdi]
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211 | %endif
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212 | mov r12, [rdx + VMMR0JMPBUF.r12]
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213 | mov r13, [rdx + VMMR0JMPBUF.r13]
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214 | mov r14, [rdx + VMMR0JMPBUF.r14]
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215 | mov r15, [rdx + VMMR0JMPBUF.r15]
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216 | mov eax, VERR_INTERNAL_ERROR ; todo better return code!
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217 | leave
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218 | ret
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219 |
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220 | .rspCheck_ok:
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221 | mov ecx, [rdx + VMMR0JMPBUF.cbSavedStack]
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222 | cmp rcx, 8192
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223 | ja .bad
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224 | test rcx, 3
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225 | jnz .bad
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226 | mov rdi, [rdx + VMMR0JMPBUF.rsp]
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227 | sub rdi, [rdx + VMMR0JMPBUF.SpResume]
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228 | cmp rcx, rdi
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229 | jne .bad
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230 |
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231 | ;
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232 | ; Restore the stack.
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233 | ;
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234 | mov byte [rdx + VMMR0JMPBUF.fInRing3Call], 0
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235 | mov ecx, [rdx + VMMR0JMPBUF.cbSavedStack]
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236 | shr ecx, 3
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237 | mov rsi, [rdx + VMMR0JMPBUF.pvSavedStack]
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238 | mov rdi, [rdx + VMMR0JMPBUF.SpResume]
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239 | mov rsp, rdi
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240 | rep movsq
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241 |
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242 | ;
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243 | ; Continue where we left off.
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244 | ;
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245 | popf
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246 | pop rbx
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247 | %ifdef ASM_CALL64_MSC
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248 | pop rsi
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249 | pop rdi
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250 | %endif
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251 | pop r12
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252 | pop r13
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253 | pop r14
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254 | pop r15
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255 | pop rbp
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256 | xor eax, eax ; VINF_SUCCESS
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257 | ret
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258 | %endif
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259 | ENDPROC vmmR0CallHostSetJmp
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260 |
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261 |
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262 | ;;
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263 | ; Worker for VMMR0CallHost.
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264 | ; This will save the stack and registers.
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265 | ;
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266 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[ebp+8] Pointer to the jump buffer.
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267 | ; @param rc msc:rdx gcc:rsi x86:[ebp+c] The return code.
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268 | ;
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269 | BEGINPROC vmmR0CallHostLongJmp
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270 | %ifdef RT_ARCH_X86
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271 | ;
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272 | ; Save the registers on the stack.
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273 | ;
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274 | push ebp
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275 | mov ebp, esp
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276 | push edi
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277 | push esi
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278 | push ebx
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279 | pushf
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280 |
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281 | ;
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282 | ; Load parameters.
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283 | ;
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284 | mov edx, [ebp + 08h] ; pJmpBuf
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285 | mov eax, [ebp + 0ch] ; rc
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286 |
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287 | ;
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288 | ; Is the jump buffer armed?
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289 | ;
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290 | cmp dword [edx + VMMR0JMPBUF.eip], byte 0
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291 | je .nok
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292 |
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293 | ;
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294 | ; Save the stack.
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295 | ;
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296 | mov edi, [edx + VMMR0JMPBUF.pvSavedStack]
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297 | mov [edx + VMMR0JMPBUF.SpResume], esp
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298 | mov esi, esp
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299 | mov ecx, [edx + VMMR0JMPBUF.esp]
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300 | sub ecx, esi
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301 |
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302 | ; two sanity checks on the size.
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303 | cmp ecx, 8192 ; check max size.
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304 | jbe .ok
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305 | .nok:
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306 | mov eax, VERR_INTERNAL_ERROR
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307 | popf
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308 | pop ebx
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309 | pop esi
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310 | pop edi
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311 | leave
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312 | ret
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313 | .ok:
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314 | test ecx, 3 ; check alignment
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315 | jnz .nok
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316 | mov [edx + VMMR0JMPBUF.cbSavedStack], ecx
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317 | shr ecx, 2
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318 | rep movsd
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319 |
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320 | ; store the last pieces of info.
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321 | mov ecx, [edx + VMMR0JMPBUF.esp]
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322 | mov [edx + VMMR0JMPBUF.SpCheck], ecx
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323 | mov byte [edx + VMMR0JMPBUF.fInRing3Call], 1
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324 |
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325 | ;
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326 | ; Do the long jump.
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327 | ;
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328 | mov ebx, [edx + VMMR0JMPBUF.ebx]
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329 | mov esi, [edx + VMMR0JMPBUF.esi]
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330 | mov edi, [edx + VMMR0JMPBUF.edi]
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331 | mov ebp, [edx + VMMR0JMPBUF.ebp]
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332 | mov ecx, [edx + VMMR0JMPBUF.eip]
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333 | mov esp, [edx + VMMR0JMPBUF.esp]
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334 | jmp ecx
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335 | %endif ; RT_ARCH_X86
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336 |
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337 | %ifdef RT_ARCH_AMD64
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338 | ;
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339 | ; Save the registers on the stack.
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340 | ;
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341 | push rbp
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342 | mov rbp, rsp
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343 | push r15
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344 | push r14
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345 | push r13
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346 | push r12
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347 | %ifdef ASM_CALL64_MSC
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348 | push rdi
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349 | push rsi
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350 | %endif
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351 | push rbx
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352 | pushf
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353 |
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354 | ;
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355 | ; Normalize the parameters.
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356 | ;
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357 | %ifdef ASM_CALL64_MSC
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358 | mov eax, edx ; rc
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359 | mov rdx, rcx ; pJmpBuf
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360 | %else
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361 | mov rdx, rdi ; pJmpBuf
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362 | mov eax, esi ; rc
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363 | %endif
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364 |
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365 | ;
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366 | ; Is the jump buffer armed?
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367 | ;
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368 | cmp qword [rdx + VMMR0JMPBUF.rip], byte 0
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369 | je .nok
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370 |
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371 | ;
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372 | ; Save the stack.
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373 | ;
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374 | mov rdi, [rdx + VMMR0JMPBUF.pvSavedStack]
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375 | mov [rdx + VMMR0JMPBUF.SpResume], rsp
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376 | mov rsi, rsp
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377 | mov rcx, [rdx + VMMR0JMPBUF.rsp]
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378 | sub rcx, rsi
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379 |
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380 | ; two sanity checks on the size.
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381 | cmp rcx, 8192 ; check max size.
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382 | jbe .ok
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383 | .nok:
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384 | mov eax, VERR_INTERNAL_ERROR
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385 | popf
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386 | pop rbx
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387 | %ifdef ASM_CALL64_MSC
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388 | pop rsi
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389 | pop rdi
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390 | %endif
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391 | pop r12
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392 | pop r13
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393 | pop r14
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394 | pop r15
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395 | leave
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396 | ret
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397 |
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398 | .ok:
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399 | test ecx, 7 ; check alignment
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400 | jnz .nok
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401 | mov [rdx + VMMR0JMPBUF.cbSavedStack], ecx
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402 | shr ecx, 3
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403 | rep movsq
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404 |
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405 | ; store the last pieces of info.
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406 | mov rcx, [rdx + VMMR0JMPBUF.rsp]
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407 | mov [rdx + VMMR0JMPBUF.SpCheck], rcx
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408 | mov byte [rdx + VMMR0JMPBUF.fInRing3Call], 1
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409 |
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410 | ;
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411 | ; Do the long jump.
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412 | ;
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413 | mov rbx, [rdx + VMMR0JMPBUF.rbx]
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414 | %ifdef ASM_CALL64_MSC
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415 | mov rsi, [rdx + VMMR0JMPBUF.rsi]
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416 | mov rdi, [rdx + VMMR0JMPBUF.rdi]
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417 | %endif
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418 | mov r12, [rdx + VMMR0JMPBUF.r12]
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419 | mov r13, [rdx + VMMR0JMPBUF.r13]
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420 | mov r14, [rdx + VMMR0JMPBUF.r14]
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421 | mov r15, [rdx + VMMR0JMPBUF.r15]
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422 | mov rbp, [rdx + VMMR0JMPBUF.rbp]
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423 | mov rcx, [rdx + VMMR0JMPBUF.rip]
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424 | mov rsp, [rdx + VMMR0JMPBUF.rsp]
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425 | jmp rcx
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426 | %endif
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427 | ENDPROC vmmR0CallHostLongJmp
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428 |
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429 |
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430 | ;;
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431 | ; Internal R0 logger worker: Logger wrapper.
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432 | ;
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433 | ; @cproto VMMR0DECL(void) vmmR0LoggerWrapper(const char *pszFormat, ...)
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434 | ;
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435 | EXPORTEDNAME vmmR0LoggerWrapper
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436 | %ifdef RT_ARCH_X86 ; The other architecture(s) use(s) C99 variadict macros.
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437 | push 0 ; assumes we're the wrapper for a default instance.
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438 | call IMP(RTLogLogger)
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439 | add esp, byte 4
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440 | ret
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441 | %else
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442 | int3
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443 | int3
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444 | int3
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445 | ret
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446 | %endif
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447 | ENDPROC vmmR0LoggerWrapper
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448 |
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