| 1 | ; $Id: VMMR0JmpA-x86.asm 39402 2011-11-23 16:25:04Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; VMM - R0 SetJmp / LongJmp routines for X86.
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2006-2009 Oracle Corporation
|
|---|
| 8 | ;
|
|---|
| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | ; available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | ; General Public License (GPL) as published by the Free Software
|
|---|
| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | ;
|
|---|
| 17 |
|
|---|
| 18 | ;*******************************************************************************
|
|---|
| 19 | ;* Header Files *
|
|---|
| 20 | ;*******************************************************************************
|
|---|
| 21 | %include "VBox/asmdefs.mac"
|
|---|
| 22 | %include "VMMInternal.mac"
|
|---|
| 23 | %include "iprt/err.mac"
|
|---|
| 24 | %include "VBox/param.mac"
|
|---|
| 25 |
|
|---|
| 26 |
|
|---|
| 27 | ;*******************************************************************************
|
|---|
| 28 | ;* Defined Constants And Macros *
|
|---|
| 29 | ;*******************************************************************************
|
|---|
| 30 | %define RESUME_MAGIC 07eadf00dh
|
|---|
| 31 | %define STACK_PADDING 0eeeeeeeeh
|
|---|
| 32 |
|
|---|
| 33 |
|
|---|
| 34 | ; For vmmR0LoggerWrapper. (The other architecture(s) use(s) C99 variadic macros.)
|
|---|
| 35 | extern NAME(RTLogLogger)
|
|---|
| 36 |
|
|---|
| 37 |
|
|---|
| 38 | BEGINCODE
|
|---|
| 39 |
|
|---|
| 40 |
|
|---|
| 41 | ;;
|
|---|
| 42 | ; The setjmp variant used for calling Ring-3.
|
|---|
| 43 | ;
|
|---|
| 44 | ; This differs from the normal setjmp in that it will resume VMMRZCallRing3 if we're
|
|---|
| 45 | ; in the middle of a ring-3 call. Another differences is the function pointer and
|
|---|
| 46 | ; argument. This has to do with resuming code and the stack frame of the caller.
|
|---|
| 47 | ;
|
|---|
| 48 | ; @returns VINF_SUCCESS on success or whatever is passed to vmmR0CallRing3LongJmp.
|
|---|
| 49 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[esp+0x04] Our jmp_buf.
|
|---|
| 50 | ; @param pfn msc:rdx gcc:rsi x86:[esp+0x08] The function to be called when not resuming.
|
|---|
| 51 | ; @param pvUser1 msc:r8 gcc:rdx x86:[esp+0x0c] The argument of that function.
|
|---|
| 52 | ; @param pvUser2 msc:r9 gcc:rcx x86:[esp+0x10] The argument of that function.
|
|---|
| 53 | ;
|
|---|
| 54 | BEGINPROC vmmR0CallRing3SetJmp
|
|---|
| 55 | GLOBALNAME vmmR0CallRing3SetJmpEx
|
|---|
| 56 | ;
|
|---|
| 57 | ; Save the registers.
|
|---|
| 58 | ;
|
|---|
| 59 | mov edx, [esp + 4h] ; pJmpBuf
|
|---|
| 60 | mov [xDX + VMMR0JMPBUF.ebx], ebx
|
|---|
| 61 | mov [xDX + VMMR0JMPBUF.esi], esi
|
|---|
| 62 | mov [xDX + VMMR0JMPBUF.edi], edi
|
|---|
| 63 | mov [xDX + VMMR0JMPBUF.ebp], ebp
|
|---|
| 64 | mov xAX, [esp]
|
|---|
| 65 | mov [xDX + VMMR0JMPBUF.eip], xAX
|
|---|
| 66 | lea ecx, [esp + 4] ; (used in resume)
|
|---|
| 67 | mov [xDX + VMMR0JMPBUF.esp], ecx
|
|---|
| 68 | pushf
|
|---|
| 69 | pop xAX
|
|---|
| 70 | mov [xDX + VMMR0JMPBUF.eflags], xAX
|
|---|
| 71 |
|
|---|
| 72 | ;
|
|---|
| 73 | ; If we're not in a ring-3 call, call pfn and return.
|
|---|
| 74 | ;
|
|---|
| 75 | test byte [xDX + VMMR0JMPBUF.fInRing3Call], 1
|
|---|
| 76 | jnz .resume
|
|---|
| 77 |
|
|---|
| 78 | mov ebx, edx ; pJmpBuf -> ebx (persistent reg)
|
|---|
| 79 | %ifdef VMM_R0_SWITCH_STACK
|
|---|
| 80 | mov esi, [ebx + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 81 | test esi, esi
|
|---|
| 82 | jz .entry_error
|
|---|
| 83 | %ifdef VBOX_STRICT
|
|---|
| 84 | cmp dword [esi], 0h
|
|---|
| 85 | jne .entry_error
|
|---|
| 86 | mov edx, esi
|
|---|
| 87 | mov edi, esi
|
|---|
| 88 | mov ecx, VMM_STACK_SIZE / 4
|
|---|
| 89 | mov eax, STACK_PADDING
|
|---|
| 90 | repne stosd
|
|---|
| 91 | %endif
|
|---|
| 92 | lea esi, [esi + VMM_STACK_SIZE - 32]
|
|---|
| 93 | mov [esi + 1ch], dword 0deadbeefh ; Marker 1.
|
|---|
| 94 | mov [esi + 18h], ebx ; Save pJmpBuf pointer.
|
|---|
| 95 | mov [esi + 14h], dword 00c00ffeeh ; Marker 2.
|
|---|
| 96 | mov [esi + 10h], dword 0f00dbeefh ; Marker 3.
|
|---|
| 97 | mov edx, [esp + 10h] ; pvArg2
|
|---|
| 98 | mov ecx, [esp + 0ch] ; pvArg1
|
|---|
| 99 | mov eax, [esp + 08h] ; pfn
|
|---|
| 100 | %if 1 ; Use this to eat of some extra stack - handy for finding paths using lots of stack.
|
|---|
| 101 | %define FRAME_OFFSET 0
|
|---|
| 102 | %else
|
|---|
| 103 | %define FRAME_OFFSET 1024
|
|---|
| 104 | %endif
|
|---|
| 105 | mov [esi - FRAME_OFFSET + 04h], edx
|
|---|
| 106 | mov [esi - FRAME_OFFSET ], ecx
|
|---|
| 107 | lea esp, [esi - FRAME_OFFSET] ; Switch stack!
|
|---|
| 108 | call eax
|
|---|
| 109 | and dword [esi + 1ch], byte 0 ; reset marker.
|
|---|
| 110 |
|
|---|
| 111 | %ifdef VBOX_STRICT
|
|---|
| 112 | ; Calc stack usage and check for overflows.
|
|---|
| 113 | mov edi, [ebx + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 114 | cmp dword [edi], STACK_PADDING ; Check for obvious stack overflow.
|
|---|
| 115 | jne .stack_overflow
|
|---|
| 116 | mov esi, eax ; save eax
|
|---|
| 117 | mov eax, STACK_PADDING
|
|---|
| 118 | mov ecx, VMM_STACK_SIZE / 4
|
|---|
| 119 | cld
|
|---|
| 120 | repe scasd
|
|---|
| 121 | shl ecx, 2 ; *4
|
|---|
| 122 | cmp ecx, VMM_STACK_SIZE - 64 ; Less than 64 bytes left -> overflow as well.
|
|---|
| 123 | mov eax, esi ; restore eax in case of overflow (esi remains used)
|
|---|
| 124 | jae .stack_overflow_almost
|
|---|
| 125 |
|
|---|
| 126 | ; Update stack usage statistics.
|
|---|
| 127 | cmp ecx, [ebx + VMMR0JMPBUF.cbUsedMax] ; New max usage?
|
|---|
| 128 | jle .no_used_max
|
|---|
| 129 | mov [ebx + VMMR0JMPBUF.cbUsedMax], ecx
|
|---|
| 130 | .no_used_max:
|
|---|
| 131 | ; To simplify the average stuff, just historize before we hit div errors.
|
|---|
| 132 | inc dword [ebx + VMMR0JMPBUF.cUsedTotal]
|
|---|
| 133 | test [ebx + VMMR0JMPBUF.cUsedTotal], dword 0c0000000h
|
|---|
| 134 | jz .no_historize
|
|---|
| 135 | mov dword [ebx + VMMR0JMPBUF.cUsedTotal], 2
|
|---|
| 136 | mov edi, [ebx + VMMR0JMPBUF.cbUsedAvg]
|
|---|
| 137 | mov [ebx + VMMR0JMPBUF.cbUsedTotal], edi
|
|---|
| 138 | mov dword [ebx + VMMR0JMPBUF.cbUsedTotal + 4], 0
|
|---|
| 139 | .no_historize:
|
|---|
| 140 | add [ebx + VMMR0JMPBUF.cbUsedTotal], ecx
|
|---|
| 141 | adc dword [ebx + VMMR0JMPBUF.cbUsedTotal + 4], 0
|
|---|
| 142 | mov eax, [ebx + VMMR0JMPBUF.cbUsedTotal]
|
|---|
| 143 | mov edx, [ebx + VMMR0JMPBUF.cbUsedTotal + 4]
|
|---|
| 144 | mov edi, [ebx + VMMR0JMPBUF.cUsedTotal]
|
|---|
| 145 | div edi
|
|---|
| 146 | mov [ebx + VMMR0JMPBUF.cbUsedAvg], eax
|
|---|
| 147 |
|
|---|
| 148 | mov eax, esi ; restore eax (final, esi released)
|
|---|
| 149 |
|
|---|
| 150 | mov edi, [ebx + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 151 | mov dword [edi], 0h ; Reset the overflow marker.
|
|---|
| 152 | %endif ; VBOX_STRICT
|
|---|
| 153 |
|
|---|
| 154 | %else ; !VMM_R0_SWITCH_STACK
|
|---|
| 155 | mov ecx, [esp + 0ch] ; pvArg1
|
|---|
| 156 | mov edx, [esp + 10h] ; pvArg2
|
|---|
| 157 | mov eax, [esp + 08h] ; pfn
|
|---|
| 158 | sub esp, 12 ; align the stack on a 16-byte boundary.
|
|---|
| 159 | mov [esp ], ecx
|
|---|
| 160 | mov [esp + 04h], edx
|
|---|
| 161 | call eax
|
|---|
| 162 | %endif ; !VMM_R0_SWITCH_STACK
|
|---|
| 163 | mov edx, ebx ; pJmpBuf -> edx (volatile reg)
|
|---|
| 164 |
|
|---|
| 165 | ;
|
|---|
| 166 | ; Return like in the long jump but clear eip, no short cuts here.
|
|---|
| 167 | ;
|
|---|
| 168 | .proper_return:
|
|---|
| 169 | mov ebx, [xDX + VMMR0JMPBUF.ebx]
|
|---|
| 170 | mov esi, [xDX + VMMR0JMPBUF.esi]
|
|---|
| 171 | mov edi, [xDX + VMMR0JMPBUF.edi]
|
|---|
| 172 | mov ebp, [xDX + VMMR0JMPBUF.ebp]
|
|---|
| 173 | mov xCX, [xDX + VMMR0JMPBUF.eip]
|
|---|
| 174 | and dword [xDX + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
|
|---|
| 175 | mov esp, [xDX + VMMR0JMPBUF.esp]
|
|---|
| 176 | push dword [xDX + VMMR0JMPBUF.eflags]
|
|---|
| 177 | popf
|
|---|
| 178 | jmp xCX
|
|---|
| 179 |
|
|---|
| 180 | .entry_error:
|
|---|
| 181 | mov eax, VERR_VMM_SET_JMP_ERROR
|
|---|
| 182 | jmp .proper_return
|
|---|
| 183 |
|
|---|
| 184 | .stack_overflow:
|
|---|
| 185 | mov eax, VERR_VMM_SET_JMP_STACK_OVERFLOW
|
|---|
| 186 | mov edx, ebx
|
|---|
| 187 | jmp .proper_return
|
|---|
| 188 |
|
|---|
| 189 | .stack_overflow_almost:
|
|---|
| 190 | mov eax, VERR_VMM_SET_JMP_STACK_OVERFLOW
|
|---|
| 191 | mov edx, ebx
|
|---|
| 192 | jmp .proper_return
|
|---|
| 193 |
|
|---|
| 194 | ;
|
|---|
| 195 | ; Aborting resume.
|
|---|
| 196 | ;
|
|---|
| 197 | .bad:
|
|---|
| 198 | and dword [xDX + VMMR0JMPBUF.eip], byte 0 ; used for valid check.
|
|---|
| 199 | mov edi, [xDX + VMMR0JMPBUF.edi]
|
|---|
| 200 | mov esi, [xDX + VMMR0JMPBUF.esi]
|
|---|
| 201 | mov ebx, [xDX + VMMR0JMPBUF.ebx]
|
|---|
| 202 | mov eax, VERR_VMM_SET_JMP_ABORTED_RESUME
|
|---|
| 203 | ret
|
|---|
| 204 |
|
|---|
| 205 | ;
|
|---|
| 206 | ; Resume VMMRZCallRing3 the call.
|
|---|
| 207 | ;
|
|---|
| 208 | .resume:
|
|---|
| 209 | ; Sanity checks.
|
|---|
| 210 | %ifdef VMM_R0_SWITCH_STACK
|
|---|
| 211 | mov eax, [xDX + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 212 | %ifdef RT_STRICT
|
|---|
| 213 | cmp dword [eax], STACK_PADDING
|
|---|
| 214 | %endif
|
|---|
| 215 | lea eax, [eax + VMM_STACK_SIZE - 32]
|
|---|
| 216 | cmp dword [eax + 1ch], 0deadbeefh ; Marker 1.
|
|---|
| 217 | jne .bad
|
|---|
| 218 | %ifdef RT_STRICT
|
|---|
| 219 | cmp [esi + 18h], edx ; The saved pJmpBuf pointer.
|
|---|
| 220 | jne .bad
|
|---|
| 221 | cmp dword [esi + 14h], 00c00ffeeh ; Marker 2.
|
|---|
| 222 | jne .bad
|
|---|
| 223 | cmp dword [esi + 10h], 0f00dbeefh ; Marker 3.
|
|---|
| 224 | jne .bad
|
|---|
| 225 | %endif
|
|---|
| 226 | %else ; !VMM_R0_SWITCH_STACK
|
|---|
| 227 | cmp ecx, [xDX + VMMR0JMPBUF.SpCheck]
|
|---|
| 228 | jne .bad
|
|---|
| 229 | .espCheck_ok:
|
|---|
| 230 | mov ecx, [xDX + VMMR0JMPBUF.cbSavedStack]
|
|---|
| 231 | cmp ecx, VMM_STACK_SIZE
|
|---|
| 232 | ja .bad
|
|---|
| 233 | test ecx, 3
|
|---|
| 234 | jnz .bad
|
|---|
| 235 | mov edi, [xDX + VMMR0JMPBUF.esp]
|
|---|
| 236 | sub edi, [xDX + VMMR0JMPBUF.SpResume]
|
|---|
| 237 | cmp ecx, edi
|
|---|
| 238 | jne .bad
|
|---|
| 239 | %endif
|
|---|
| 240 |
|
|---|
| 241 | %ifdef VMM_R0_SWITCH_STACK
|
|---|
| 242 | ; Switch stack.
|
|---|
| 243 | mov esp, [xDX + VMMR0JMPBUF.SpResume]
|
|---|
| 244 | %else
|
|---|
| 245 | ; Restore the stack.
|
|---|
| 246 | mov ecx, [xDX + VMMR0JMPBUF.cbSavedStack]
|
|---|
| 247 | shr ecx, 2
|
|---|
| 248 | mov esi, [xDX + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 249 | mov edi, [xDX + VMMR0JMPBUF.SpResume]
|
|---|
| 250 | mov esp, edi
|
|---|
| 251 | rep movsd
|
|---|
| 252 | %endif ; !VMM_R0_SWITCH_STACK
|
|---|
| 253 | mov byte [xDX + VMMR0JMPBUF.fInRing3Call], 0
|
|---|
| 254 |
|
|---|
| 255 | ;
|
|---|
| 256 | ; Continue where we left off.
|
|---|
| 257 | ;
|
|---|
| 258 | %ifdef VBOX_STRICT
|
|---|
| 259 | pop eax ; magic
|
|---|
| 260 | cmp eax, RESUME_MAGIC
|
|---|
| 261 | je .magic_ok
|
|---|
| 262 | mov ecx, 0123h
|
|---|
| 263 | mov [ecx], edx
|
|---|
| 264 | .magic_ok:
|
|---|
| 265 | %endif
|
|---|
| 266 | popf
|
|---|
| 267 | pop ebx
|
|---|
| 268 | pop esi
|
|---|
| 269 | pop edi
|
|---|
| 270 | pop ebp
|
|---|
| 271 | xor eax, eax ; VINF_SUCCESS
|
|---|
| 272 | ret
|
|---|
| 273 | ENDPROC vmmR0CallRing3SetJmp
|
|---|
| 274 |
|
|---|
| 275 |
|
|---|
| 276 | ;;
|
|---|
| 277 | ; Worker for VMMRZCallRing3.
|
|---|
| 278 | ; This will save the stack and registers.
|
|---|
| 279 | ;
|
|---|
| 280 | ; @param pJmpBuf msc:rcx gcc:rdi x86:[ebp+8] Pointer to the jump buffer.
|
|---|
| 281 | ; @param rc msc:rdx gcc:rsi x86:[ebp+c] The return code.
|
|---|
| 282 | ;
|
|---|
| 283 | BEGINPROC vmmR0CallRing3LongJmp
|
|---|
| 284 | ;
|
|---|
| 285 | ; Save the registers on the stack.
|
|---|
| 286 | ;
|
|---|
| 287 | push ebp
|
|---|
| 288 | mov ebp, esp
|
|---|
| 289 | push edi
|
|---|
| 290 | push esi
|
|---|
| 291 | push ebx
|
|---|
| 292 | pushf
|
|---|
| 293 | %ifdef VBOX_STRICT
|
|---|
| 294 | push RESUME_MAGIC
|
|---|
| 295 | %endif
|
|---|
| 296 |
|
|---|
| 297 | ;
|
|---|
| 298 | ; Load parameters.
|
|---|
| 299 | ;
|
|---|
| 300 | mov edx, [ebp + 08h] ; pJmpBuf
|
|---|
| 301 | mov eax, [ebp + 0ch] ; rc
|
|---|
| 302 |
|
|---|
| 303 | ;
|
|---|
| 304 | ; Is the jump buffer armed?
|
|---|
| 305 | ;
|
|---|
| 306 | cmp dword [xDX + VMMR0JMPBUF.eip], byte 0
|
|---|
| 307 | je .nok
|
|---|
| 308 |
|
|---|
| 309 | ;
|
|---|
| 310 | ; Sanity checks.
|
|---|
| 311 | ;
|
|---|
| 312 | mov edi, [xDX + VMMR0JMPBUF.pvSavedStack]
|
|---|
| 313 | test edi, edi ; darwin may set this to 0.
|
|---|
| 314 | jz .nok
|
|---|
| 315 | mov [xDX + VMMR0JMPBUF.SpResume], esp
|
|---|
| 316 | %ifndef VMM_R0_SWITCH_STACK
|
|---|
| 317 | mov esi, esp
|
|---|
| 318 | mov ecx, [xDX + VMMR0JMPBUF.esp]
|
|---|
| 319 | sub ecx, esi
|
|---|
| 320 |
|
|---|
| 321 | ; two sanity checks on the size.
|
|---|
| 322 | cmp ecx, VMM_STACK_SIZE ; check max size.
|
|---|
| 323 | jnbe .nok
|
|---|
| 324 |
|
|---|
| 325 | ;
|
|---|
| 326 | ; Copy the stack.
|
|---|
| 327 | ;
|
|---|
| 328 | test ecx, 3 ; check alignment
|
|---|
| 329 | jnz .nok
|
|---|
| 330 | mov [xDX + VMMR0JMPBUF.cbSavedStack], ecx
|
|---|
| 331 | shr ecx, 2
|
|---|
| 332 | rep movsd
|
|---|
| 333 | %endif ; !VMM_R0_SWITCH_STACK
|
|---|
| 334 |
|
|---|
| 335 | ; Save ESP & EBP to enable stack dumps
|
|---|
| 336 | mov ecx, ebp
|
|---|
| 337 | mov [xDX + VMMR0JMPBUF.SavedEbp], ecx
|
|---|
| 338 | sub ecx, 4
|
|---|
| 339 | mov [xDX + VMMR0JMPBUF.SavedEsp], ecx
|
|---|
| 340 |
|
|---|
| 341 | ; store the last pieces of info.
|
|---|
| 342 | mov ecx, [xDX + VMMR0JMPBUF.esp]
|
|---|
| 343 | mov [xDX + VMMR0JMPBUF.SpCheck], ecx
|
|---|
| 344 | mov byte [xDX + VMMR0JMPBUF.fInRing3Call], 1
|
|---|
| 345 |
|
|---|
| 346 | ;
|
|---|
| 347 | ; Do the long jump.
|
|---|
| 348 | ;
|
|---|
| 349 | mov ebx, [xDX + VMMR0JMPBUF.ebx]
|
|---|
| 350 | mov esi, [xDX + VMMR0JMPBUF.esi]
|
|---|
| 351 | mov edi, [xDX + VMMR0JMPBUF.edi]
|
|---|
| 352 | mov ebp, [xDX + VMMR0JMPBUF.ebp]
|
|---|
| 353 | mov ecx, [xDX + VMMR0JMPBUF.eip]
|
|---|
| 354 | mov esp, [xDX + VMMR0JMPBUF.esp]
|
|---|
| 355 | push dword [xDX + VMMR0JMPBUF.eflags]
|
|---|
| 356 | popf
|
|---|
| 357 | jmp ecx
|
|---|
| 358 |
|
|---|
| 359 | ;
|
|---|
| 360 | ; Failure
|
|---|
| 361 | ;
|
|---|
| 362 | .nok:
|
|---|
| 363 | %ifdef VBOX_STRICT
|
|---|
| 364 | pop eax ; magic
|
|---|
| 365 | cmp eax, RESUME_MAGIC
|
|---|
| 366 | je .magic_ok
|
|---|
| 367 | mov ecx, 0123h
|
|---|
| 368 | mov [ecx], edx
|
|---|
| 369 | .magic_ok:
|
|---|
| 370 | %endif
|
|---|
| 371 | popf
|
|---|
| 372 | pop ebx
|
|---|
| 373 | pop esi
|
|---|
| 374 | pop edi
|
|---|
| 375 | mov eax, VERR_VMM_LONG_JMP_ERROR
|
|---|
| 376 | leave
|
|---|
| 377 | ret
|
|---|
| 378 | ENDPROC vmmR0CallRing3LongJmp
|
|---|
| 379 |
|
|---|
| 380 |
|
|---|
| 381 | ;;
|
|---|
| 382 | ; Internal R0 logger worker: Logger wrapper.
|
|---|
| 383 | ;
|
|---|
| 384 | ; @cproto VMMR0DECL(void) vmmR0LoggerWrapper(const char *pszFormat, ...)
|
|---|
| 385 | ;
|
|---|
| 386 | EXPORTEDNAME vmmR0LoggerWrapper
|
|---|
| 387 | push 0 ; assumes we're the wrapper for a default instance.
|
|---|
| 388 | call NAME(RTLogLogger)
|
|---|
| 389 | add esp, byte 4
|
|---|
| 390 | ret
|
|---|
| 391 | ENDPROC vmmR0LoggerWrapper
|
|---|
| 392 |
|
|---|
