1 | ; $Id: VMMR0JmpA-amd64.asm 87456 2021-01-28 12:11:20Z vboxsync $
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2 | ;; @file
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3 | ; VMM - R0 SetJmp / LongJmp routines for AMD64.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2020 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 |
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18 | ;*******************************************************************************
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19 | ;* Header Files *
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20 | ;*******************************************************************************
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21 | %define RT_ASM_WITH_SEH64_ALT
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22 | %include "VBox/asmdefs.mac"
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23 | %include "VMMInternal.mac"
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24 | %include "VBox/err.mac"
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25 | %include "VBox/param.mac"
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26 |
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27 |
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28 | ;*******************************************************************************
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29 | ;* Defined Constants And Macros *
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30 | ;*******************************************************************************
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31 | %define RESUME_MAGIC 07eadf00dh
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32 | %define STACK_PADDING 0eeeeeeeeeeeeeeeeh
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33 |
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34 | ;; Workaround for linux 4.6 fast/slow syscall stack depth difference.
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35 | %ifdef VMM_R0_SWITCH_STACK
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36 | %define STACK_FUZZ_SIZE 0
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37 | %else
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38 | %define STACK_FUZZ_SIZE 128
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39 | %endif
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40 |
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41 |
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42 | BEGINCODE
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43 |
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44 |
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45 | ;;
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46 | ; The setjmp variant used for calling Ring-3.
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47 | ;
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48 | ; This differs from the normal setjmp in that it will resume VMMRZCallRing3 if we're
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49 | ; in the middle of a ring-3 call. Another differences is the function pointer and
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50 | ; argument. This has to do with resuming code and the stack frame of the caller.
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51 | ;
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52 | ; @returns VINF_SUCCESS on success or whatever is passed to vmmR0CallRing3LongJmp.
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53 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[esp+0x04] Our jmp_buf.
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54 | ; @param pfn msc:rdx gcc:rsi x86:[esp+0x08] The function to be called when not resuming.
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55 | ; @param pvUser1 msc:r8 gcc:rdx x86:[esp+0x0c] The argument of that function.
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56 | ; @param pvUser2 msc:r9 gcc:rcx x86:[esp+0x10] The argument of that function.
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57 | ;
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58 | GLOBALNAME vmmR0CallRing3SetJmp2
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59 | GLOBALNAME vmmR0CallRing3SetJmpEx
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60 | BEGINPROC vmmR0CallRing3SetJmp
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61 | ;
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62 | ; Save the registers.
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63 | ;
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64 | push rbp
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65 | SEH64_PUSH_xBP
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66 | mov rbp, rsp
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67 | SEH64_SET_FRAME_xBP 0
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68 | %ifdef ASM_CALL64_MSC
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69 | sub rsp, 30h + STACK_FUZZ_SIZE ; (10h is used by resume (??), 20h for callee spill area)
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70 | SEH64_ALLOCATE_STACK 30h + STACK_FUZZ_SIZE
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71 | SEH64_END_PROLOGUE
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72 | mov r11, rdx ; pfn
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73 | mov rdx, rcx ; pJmpBuf;
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74 | %else
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75 | sub rsp, 10h + STACK_FUZZ_SIZE ; (10h is used by resume (??))
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76 | SEH64_ALLOCATE_STACK 10h + STACK_FUZZ_SIZE
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77 | SEH64_END_PROLOGUE
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78 | mov r8, rdx ; pvUser1 (save it like MSC)
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79 | mov r9, rcx ; pvUser2 (save it like MSC)
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80 | mov r11, rsi ; pfn
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81 | mov rdx, rdi ; pJmpBuf
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82 | %endif
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83 | mov [xDX + VMMR0JMPBUF.rbx], rbx
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84 | %ifdef ASM_CALL64_MSC
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85 | mov [xDX + VMMR0JMPBUF.rsi], rsi
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86 | mov [xDX + VMMR0JMPBUF.rdi], rdi
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87 | %endif
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88 | mov [xDX + VMMR0JMPBUF.rbp], rbp
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89 | mov [xDX + VMMR0JMPBUF.r12], r12
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90 | mov [xDX + VMMR0JMPBUF.r13], r13
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91 | mov [xDX + VMMR0JMPBUF.r14], r14
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92 | mov [xDX + VMMR0JMPBUF.r15], r15
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93 | mov xAX, [rbp + 8] ; (not really necessary, except for validity check)
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94 | mov [xDX + VMMR0JMPBUF.rip], xAX
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95 | %ifdef ASM_CALL64_MSC
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96 | lea r10, [rsp + 20h] ; must save the spill area
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97 | %else
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98 | lea r10, [rsp]
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99 | %endif
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100 | mov [xDX + VMMR0JMPBUF.rsp], r10
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101 | %ifdef RT_OS_WINDOWS
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102 | movdqa [xDX + VMMR0JMPBUF.xmm6], xmm6
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103 | movdqa [xDX + VMMR0JMPBUF.xmm7], xmm7
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104 | movdqa [xDX + VMMR0JMPBUF.xmm8], xmm8
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105 | movdqa [xDX + VMMR0JMPBUF.xmm9], xmm9
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106 | movdqa [xDX + VMMR0JMPBUF.xmm10], xmm10
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107 | movdqa [xDX + VMMR0JMPBUF.xmm11], xmm11
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108 | movdqa [xDX + VMMR0JMPBUF.xmm12], xmm12
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109 | movdqa [xDX + VMMR0JMPBUF.xmm13], xmm13
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110 | movdqa [xDX + VMMR0JMPBUF.xmm14], xmm14
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111 | movdqa [xDX + VMMR0JMPBUF.xmm15], xmm15
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112 | %endif
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113 | pushf
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114 | pop xAX
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115 | mov [xDX + VMMR0JMPBUF.rflags], xAX
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116 |
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117 | ;
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118 | ; If we're not in a ring-3 call, call pfn and return.
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119 | ;
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120 | test byte [xDX + VMMR0JMPBUF.fInRing3Call], 1
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121 | jnz .resume
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122 |
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123 | %ifdef VMM_R0_SWITCH_STACK
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124 | mov r15, [xDX + VMMR0JMPBUF.pvSavedStack]
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125 | test r15, r15
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126 | jz .entry_error
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127 | %ifdef VBOX_STRICT
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128 | cmp dword [r15], 0h
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129 | jne .entry_error
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130 | mov rdi, r15
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131 | mov rcx, VMM_STACK_SIZE / 8
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132 | mov rax, qword 0eeeeeeeffeeeeeeeh
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133 | repne stosq
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134 | mov [rdi - 10h], rbx
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135 | %endif
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136 | lea r15, [r15 + VMM_STACK_SIZE - 40h]
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137 | mov rsp, r15 ; Switch stack!
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138 | %endif ; VMM_R0_SWITCH_STACK
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139 |
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140 | mov r12, rdx ; Save pJmpBuf.
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141 | %ifdef ASM_CALL64_MSC
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142 | mov rcx, r8 ; pvUser -> arg0
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143 | mov rdx, r9
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144 | %else
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145 | mov rdi, r8 ; pvUser -> arg0
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146 | mov rsi, r9
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147 | %endif
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148 | call r11
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149 | mov rdx, r12 ; Restore pJmpBuf
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150 |
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151 | %ifdef VMM_R0_SWITCH_STACK
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152 | %ifdef VBOX_STRICT
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153 | mov r15, [xDX + VMMR0JMPBUF.pvSavedStack]
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154 | mov dword [r15], 0h ; Reset the marker
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155 | %endif
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156 | %endif
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157 |
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158 | ;
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159 | ; Return like in the long jump but clear eip, no shortcuts here.
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160 | ;
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161 | .proper_return:
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162 | %ifdef RT_OS_WINDOWS
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163 | movdqa xmm6, [xDX + VMMR0JMPBUF.xmm6 ]
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164 | movdqa xmm7, [xDX + VMMR0JMPBUF.xmm7 ]
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165 | movdqa xmm8, [xDX + VMMR0JMPBUF.xmm8 ]
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166 | movdqa xmm9, [xDX + VMMR0JMPBUF.xmm9 ]
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167 | movdqa xmm10, [xDX + VMMR0JMPBUF.xmm10]
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168 | movdqa xmm11, [xDX + VMMR0JMPBUF.xmm11]
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169 | movdqa xmm12, [xDX + VMMR0JMPBUF.xmm12]
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170 | movdqa xmm13, [xDX + VMMR0JMPBUF.xmm13]
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171 | movdqa xmm14, [xDX + VMMR0JMPBUF.xmm14]
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172 | movdqa xmm15, [xDX + VMMR0JMPBUF.xmm15]
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173 | %endif
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174 | mov rbx, [xDX + VMMR0JMPBUF.rbx]
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175 | %ifdef ASM_CALL64_MSC
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176 | mov rsi, [xDX + VMMR0JMPBUF.rsi]
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177 | mov rdi, [xDX + VMMR0JMPBUF.rdi]
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178 | %endif
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179 | mov r12, [xDX + VMMR0JMPBUF.r12]
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180 | mov r13, [xDX + VMMR0JMPBUF.r13]
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181 | mov r14, [xDX + VMMR0JMPBUF.r14]
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182 | mov r15, [xDX + VMMR0JMPBUF.r15]
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183 | mov rbp, [xDX + VMMR0JMPBUF.rbp]
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184 | and qword [xDX + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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185 | mov rsp, [xDX + VMMR0JMPBUF.rsp]
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186 | push qword [xDX + VMMR0JMPBUF.rflags]
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187 | popf
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188 | leave
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189 | ret
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190 |
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191 | .entry_error:
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192 | mov eax, VERR_VMM_SET_JMP_ERROR
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193 | jmp .proper_return
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194 |
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195 | .stack_overflow:
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196 | mov eax, VERR_VMM_SET_JMP_STACK_OVERFLOW
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197 | jmp .proper_return
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198 |
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199 | ;
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200 | ; Aborting resume.
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201 | ; Note! No need to restore XMM registers here since we haven't touched them yet.
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202 | ;
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203 | .bad:
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204 | and qword [xDX + VMMR0JMPBUF.rip], byte 0 ; used for valid check.
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205 | mov rbx, [xDX + VMMR0JMPBUF.rbx]
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206 | %ifdef ASM_CALL64_MSC
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207 | mov rsi, [xDX + VMMR0JMPBUF.rsi]
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208 | mov rdi, [xDX + VMMR0JMPBUF.rdi]
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209 | %endif
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210 | mov r12, [xDX + VMMR0JMPBUF.r12]
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211 | mov r13, [xDX + VMMR0JMPBUF.r13]
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212 | mov r14, [xDX + VMMR0JMPBUF.r14]
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213 | mov r15, [xDX + VMMR0JMPBUF.r15]
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214 | mov eax, VERR_VMM_SET_JMP_ABORTED_RESUME
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215 | leave
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216 | ret
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217 |
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218 | ;
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219 | ; Resume VMMRZCallRing3 the call.
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220 | ;
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221 | .resume:
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222 | %ifndef VMM_R0_SWITCH_STACK
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223 | ; Sanity checks incoming stack, applying fuzz if needed.
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224 | sub r10, [xDX + VMMR0JMPBUF.SpCheck]
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225 | jz .resume_stack_checked_out
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226 | add r10, STACK_FUZZ_SIZE ; plus/minus STACK_FUZZ_SIZE is fine.
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227 | cmp r10, STACK_FUZZ_SIZE * 2
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228 | ja .bad
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229 |
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230 | mov r10, [xDX + VMMR0JMPBUF.SpCheck]
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231 | mov [xDX + VMMR0JMPBUF.rsp], r10 ; Must be update in case of another long jump (used for save calc).
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232 |
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233 | .resume_stack_checked_out:
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234 | mov ecx, [xDX + VMMR0JMPBUF.cbSavedStack]
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235 | cmp rcx, VMM_STACK_SIZE
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236 | ja .bad
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237 | test rcx, 7
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238 | jnz .bad
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239 | mov rdi, [xDX + VMMR0JMPBUF.SpCheck]
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240 | sub rdi, [xDX + VMMR0JMPBUF.SpResume]
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241 | cmp rcx, rdi
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242 | jne .bad
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243 | %endif
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244 |
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245 | %ifdef VMM_R0_SWITCH_STACK
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246 | ; Switch stack.
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247 | mov rsp, [xDX + VMMR0JMPBUF.SpResume]
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248 | %else
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249 | ; Restore the stack.
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250 | mov ecx, [xDX + VMMR0JMPBUF.cbSavedStack]
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251 | shr ecx, 3
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252 | mov rsi, [xDX + VMMR0JMPBUF.pvSavedStack]
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253 | mov rdi, [xDX + VMMR0JMPBUF.SpResume]
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254 | mov rsp, rdi
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255 | rep movsq
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256 | %endif ; !VMM_R0_SWITCH_STACK
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257 | mov byte [xDX + VMMR0JMPBUF.fInRing3Call], 0
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258 |
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259 | ;
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260 | ; Continue where we left off.
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261 | ;
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262 | %ifdef VBOX_STRICT
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263 | pop rax ; magic
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264 | cmp rax, RESUME_MAGIC
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265 | je .magic_ok
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266 | mov ecx, 0123h
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267 | mov [ecx], edx
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268 | .magic_ok:
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269 | %endif
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270 | %ifdef RT_OS_WINDOWS
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271 | movdqa xmm6, [rsp + 000h]
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272 | movdqa xmm7, [rsp + 010h]
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273 | movdqa xmm8, [rsp + 020h]
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274 | movdqa xmm9, [rsp + 030h]
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275 | movdqa xmm10, [rsp + 040h]
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276 | movdqa xmm11, [rsp + 050h]
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277 | movdqa xmm12, [rsp + 060h]
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278 | movdqa xmm13, [rsp + 070h]
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279 | movdqa xmm14, [rsp + 080h]
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280 | movdqa xmm15, [rsp + 090h]
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281 | add rsp, 0a0h
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282 | %endif
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283 | popf
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284 | pop rbx
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285 | %ifdef ASM_CALL64_MSC
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286 | pop rsi
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287 | pop rdi
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288 | %endif
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289 | pop r12
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290 | pop r13
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291 | pop r14
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292 | pop r15
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293 | pop rbp
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294 | xor eax, eax ; VINF_SUCCESS
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295 | ret
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296 | ENDPROC vmmR0CallRing3SetJmp
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297 |
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298 |
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299 | ;;
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300 | ; Worker for VMMRZCallRing3.
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301 | ; This will save the stack and registers.
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302 | ;
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303 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[ebp+8] Pointer to the jump buffer.
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304 | ; @param rc msc:rdx gcc:rsi x86:[ebp+c] The return code.
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305 | ;
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306 | BEGINPROC vmmR0CallRing3LongJmp
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307 | ;
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308 | ; Save the registers on the stack.
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309 | ;
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310 | push rbp
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311 | SEH64_PUSH_xBP
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312 | mov rbp, rsp
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313 | SEH64_SET_FRAME_xBP 0
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314 | push r15
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315 | SEH64_PUSH_GREG r15
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316 | push r14
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317 | SEH64_PUSH_GREG r14
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318 | push r13
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319 | SEH64_PUSH_GREG r13
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320 | push r12
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321 | SEH64_PUSH_GREG r12
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322 | %ifdef ASM_CALL64_MSC
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323 | push rdi
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324 | SEH64_PUSH_GREG rdi
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325 | push rsi
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326 | SEH64_PUSH_GREG rsi
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327 | %endif
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328 | push rbx
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329 | SEH64_PUSH_GREG rbx
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330 | pushf
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331 | SEH64_ALLOCATE_STACK 8
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332 | %ifdef RT_OS_WINDOWS
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333 | sub rsp, 0a0h
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334 | SEH64_ALLOCATE_STACK 0a0h
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335 | movdqa [rsp + 000h], xmm6
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336 | movdqa [rsp + 010h], xmm7
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337 | movdqa [rsp + 020h], xmm8
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338 | movdqa [rsp + 030h], xmm9
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339 | movdqa [rsp + 040h], xmm10
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340 | movdqa [rsp + 050h], xmm11
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341 | movdqa [rsp + 060h], xmm12
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342 | movdqa [rsp + 070h], xmm13
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343 | movdqa [rsp + 080h], xmm14
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344 | movdqa [rsp + 090h], xmm15
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345 | %endif
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346 | %ifdef VBOX_STRICT
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347 | push RESUME_MAGIC
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348 | SEH64_ALLOCATE_STACK 8
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349 | %endif
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350 | SEH64_END_PROLOGUE
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351 |
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352 | ;
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353 | ; Normalize the parameters.
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354 | ;
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355 | %ifdef ASM_CALL64_MSC
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356 | mov eax, edx ; rc
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357 | mov rdx, rcx ; pJmpBuf
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358 | %else
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359 | mov rdx, rdi ; pJmpBuf
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360 | mov eax, esi ; rc
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361 | %endif
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362 |
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363 | ;
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364 | ; Is the jump buffer armed?
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365 | ;
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366 | cmp qword [xDX + VMMR0JMPBUF.rip], byte 0
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367 | je .nok
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368 |
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369 | ;
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370 | ; Sanity checks.
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371 | ;
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372 | mov rdi, [xDX + VMMR0JMPBUF.pvSavedStack]
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373 | test rdi, rdi ; darwin may set this to 0.
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374 | jz .nok
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375 | mov [xDX + VMMR0JMPBUF.SpResume], rsp
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376 | %ifndef VMM_R0_SWITCH_STACK
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377 | mov rsi, rsp
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378 | mov rcx, [xDX + VMMR0JMPBUF.rsp]
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379 | sub rcx, rsi
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380 |
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381 | ; two sanity checks on the size.
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382 | cmp rcx, VMM_STACK_SIZE ; check max size.
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383 | jnbe .nok
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384 |
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385 | ;
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386 | ; Copy the stack
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387 | ;
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388 | test ecx, 7 ; check alignment
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389 | jnz .nok
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390 | mov [xDX + VMMR0JMPBUF.cbSavedStack], ecx
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391 | shr ecx, 3
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392 | rep movsq
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393 |
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394 | %endif ; !VMM_R0_SWITCH_STACK
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395 |
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396 | ; Save a PC and return PC here to assist unwinding.
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397 | .unwind_point:
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398 | lea rcx, [.unwind_point wrt RIP]
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399 | mov [xDX + VMMR0JMPBUF.SavedEipForUnwind], rcx
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400 | mov rcx, [xDX + VMMR0JMPBUF.rbp]
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401 | lea rcx, [rcx + 8]
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402 | mov [xDX + VMMR0JMPBUF.UnwindRetPcLocation], rcx
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403 | mov rcx, [rcx]
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404 | mov [xDX + VMMR0JMPBUF.UnwindRetPcValue], rcx
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405 |
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406 | ; Save RSP & RBP to enable stack dumps
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407 | mov rcx, rbp
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408 | mov [xDX + VMMR0JMPBUF.SavedEbp], rcx
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409 | sub rcx, 8
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410 | mov [xDX + VMMR0JMPBUF.SavedEsp], rcx
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411 |
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412 | ; store the last pieces of info.
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413 | mov rcx, [xDX + VMMR0JMPBUF.rsp]
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414 | mov [xDX + VMMR0JMPBUF.SpCheck], rcx
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415 | mov byte [xDX + VMMR0JMPBUF.fInRing3Call], 1
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416 |
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417 | ;
|
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418 | ; Do the long jump.
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419 | ;
|
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420 | %ifdef RT_OS_WINDOWS
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421 | movdqa xmm6, [xDX + VMMR0JMPBUF.xmm6 ]
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422 | movdqa xmm7, [xDX + VMMR0JMPBUF.xmm7 ]
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423 | movdqa xmm8, [xDX + VMMR0JMPBUF.xmm8 ]
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424 | movdqa xmm9, [xDX + VMMR0JMPBUF.xmm9 ]
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425 | movdqa xmm10, [xDX + VMMR0JMPBUF.xmm10]
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426 | movdqa xmm11, [xDX + VMMR0JMPBUF.xmm11]
|
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427 | movdqa xmm12, [xDX + VMMR0JMPBUF.xmm12]
|
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428 | movdqa xmm13, [xDX + VMMR0JMPBUF.xmm13]
|
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429 | movdqa xmm14, [xDX + VMMR0JMPBUF.xmm14]
|
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430 | movdqa xmm15, [xDX + VMMR0JMPBUF.xmm15]
|
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431 | %endif
|
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432 | mov rbx, [xDX + VMMR0JMPBUF.rbx]
|
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433 | %ifdef ASM_CALL64_MSC
|
---|
434 | mov rsi, [xDX + VMMR0JMPBUF.rsi]
|
---|
435 | mov rdi, [xDX + VMMR0JMPBUF.rdi]
|
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436 | %endif
|
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437 | mov r12, [xDX + VMMR0JMPBUF.r12]
|
---|
438 | mov r13, [xDX + VMMR0JMPBUF.r13]
|
---|
439 | mov r14, [xDX + VMMR0JMPBUF.r14]
|
---|
440 | mov r15, [xDX + VMMR0JMPBUF.r15]
|
---|
441 | mov rbp, [xDX + VMMR0JMPBUF.rbp]
|
---|
442 | mov rsp, [xDX + VMMR0JMPBUF.rsp]
|
---|
443 | push qword [xDX + VMMR0JMPBUF.rflags]
|
---|
444 | popf
|
---|
445 | leave
|
---|
446 | ret
|
---|
447 |
|
---|
448 | ;
|
---|
449 | ; Failure
|
---|
450 | ;
|
---|
451 | .nok:
|
---|
452 | %ifdef VBOX_STRICT
|
---|
453 | pop rax ; magic
|
---|
454 | cmp rax, RESUME_MAGIC
|
---|
455 | je .magic_ok
|
---|
456 | mov ecx, 0123h
|
---|
457 | mov [rcx], edx
|
---|
458 | .magic_ok:
|
---|
459 | %endif
|
---|
460 | mov eax, VERR_VMM_LONG_JMP_ERROR
|
---|
461 | %ifdef RT_OS_WINDOWS
|
---|
462 | add rsp, 0a0h ; skip XMM registers since they are unmodified.
|
---|
463 | %endif
|
---|
464 | popf
|
---|
465 | pop rbx
|
---|
466 | %ifdef ASM_CALL64_MSC
|
---|
467 | pop rsi
|
---|
468 | pop rdi
|
---|
469 | %endif
|
---|
470 | pop r12
|
---|
471 | pop r13
|
---|
472 | pop r14
|
---|
473 | pop r15
|
---|
474 | leave
|
---|
475 | ret
|
---|
476 | ENDPROC vmmR0CallRing3LongJmp
|
---|
477 |
|
---|
478 |
|
---|
479 | ;;
|
---|
480 | ; Internal R0 logger worker: Logger wrapper.
|
---|
481 | ;
|
---|
482 | ; @cproto VMMR0DECL(void) vmmR0LoggerWrapper(const char *pszFormat, ...)
|
---|
483 | ;
|
---|
484 | BEGINPROC_EXPORTED vmmR0LoggerWrapper
|
---|
485 | SEH64_END_PROLOGUE
|
---|
486 | int3
|
---|
487 | int3
|
---|
488 | int3
|
---|
489 | ret
|
---|
490 | ENDPROC vmmR0LoggerWrapper
|
---|
491 |
|
---|