projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 28ee5816 LG |
1 | ;------------------------------------------------------------------------------ ;\r |
| 2 | ; Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>\r | |
| 3 | ; This program and the accompanying materials\r | |
| 4 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
| 5 | ; which accompanies this distribution. The full text of the license may be found at\r | |
| 6 | ; http://opensource.org/licenses/bsd-license.php.\r | |
| 7 | ;\r | |
| 8 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
| 9 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
| 10 | ;\r | |
| 11 | ; Module Name:\r | |
| 12 | ;\r | |
| 13 | ; SmiException.nasm\r | |
| 14 | ;\r | |
| 15 | ; Abstract:\r | |
| 16 | ;\r | |
| 17 | ; Exception handlers used in SM mode\r | |
| 18 | ;\r | |
| 19 | ;-------------------------------------------------------------------------------\r | |
| 20 | \r | |
| 21 | extern ASM_PFX(FeaturePcdGet (PcdCpuSmmProfileEnable))\r | |
| 22 | extern ASM_PFX(gSmiMtrrs)\r | |
| 23 | extern ASM_PFX(SmiPFHandler)\r | |
| 24 | \r | |
| 25 | global ASM_PFX(gcSmiIdtr)\r | |
| 26 | global ASM_PFX(gcSmiGdtr)\r | |
| 27 | global ASM_PFX(gcPsd)\r | |
| 28 | \r | |
| 29 | SECTION .data\r | |
| 30 | \r | |
| 31 | NullSeg: DQ 0 ; reserved by architecture\r | |
| 32 | CodeSeg32:\r | |
| 33 | DW -1 ; LimitLow\r | |
| 34 | DW 0 ; BaseLow\r | |
| 35 | DB 0 ; BaseMid\r | |
| 36 | DB 0x9b\r | |
| 37 | DB 0xcf ; LimitHigh\r | |
| 38 | DB 0 ; BaseHigh\r | |
| 39 | ProtModeCodeSeg32:\r | |
| 40 | DW -1 ; LimitLow\r | |
| 41 | DW 0 ; BaseLow\r | |
| 42 | DB 0 ; BaseMid\r | |
| 43 | DB 0x9b\r | |
| 44 | DB 0xcf ; LimitHigh\r | |
| 45 | DB 0 ; BaseHigh\r | |
| 46 | ProtModeSsSeg32:\r | |
| 47 | DW -1 ; LimitLow\r | |
| 48 | DW 0 ; BaseLow\r | |
| 49 | DB 0 ; BaseMid\r | |
| 50 | DB 0x93\r | |
| 51 | DB 0xcf ; LimitHigh\r | |
| 52 | DB 0 ; BaseHigh\r | |
| 53 | DataSeg32:\r | |
| 54 | DW -1 ; LimitLow\r | |
| 55 | DW 0 ; BaseLow\r | |
| 56 | DB 0 ; BaseMid\r | |
| 57 | DB 0x93\r | |
| 58 | DB 0xcf ; LimitHigh\r | |
| 59 | DB 0 ; BaseHigh\r | |
| 60 | CodeSeg16:\r | |
| 61 | DW -1\r | |
| 62 | DW 0\r | |
| 63 | DB 0\r | |
| 64 | DB 0x9b\r | |
| 65 | DB 0x8f\r | |
| 66 | DB 0\r | |
| 67 | DataSeg16:\r | |
| 68 | DW -1\r | |
| 69 | DW 0\r | |
| 70 | DB 0\r | |
| 71 | DB 0x93\r | |
| 72 | DB 0x8f\r | |
| 73 | DB 0\r | |
| 74 | CodeSeg64:\r | |
| 75 | DW -1 ; LimitLow\r | |
| 76 | DW 0 ; BaseLow\r | |
| 77 | DB 0 ; BaseMid\r | |
| 78 | DB 0x9b\r | |
| 79 | DB 0xaf ; LimitHigh\r | |
| 80 | DB 0 ; BaseHigh\r | |
| 81 | GDT_SIZE equ $ - NullSeg\r | |
| 82 | \r | |
| 83 | TssSeg:\r | |
| 84 | DW TSS_DESC_SIZE ; LimitLow\r | |
| 85 | DW 0 ; BaseLow\r | |
| 86 | DB 0 ; BaseMid\r | |
| 87 | DB 0x89\r | |
| 88 | DB 0x80 ; LimitHigh\r | |
| 89 | DB 0 ; BaseHigh\r | |
| 90 | ExceptionTssSeg:\r | |
| 91 | DW TSS_DESC_SIZE ; LimitLow\r | |
| 92 | DW 0 ; BaseLow\r | |
| 93 | DB 0 ; BaseMid\r | |
| 94 | DB 0x89\r | |
| 95 | DB 0x80 ; LimitHigh\r | |
| 96 | DB 0 ; BaseHigh\r | |
| 97 | \r | |
| 98 | CODE_SEL equ CodeSeg32 - NullSeg\r | |
| 99 | DATA_SEL equ DataSeg32 - NullSeg\r | |
| 100 | TSS_SEL equ TssSeg - NullSeg\r | |
| 101 | EXCEPTION_TSS_SEL equ ExceptionTssSeg - NullSeg\r | |
| 102 | \r | |
| 103 | struc IA32_TSS\r | |
| 104 | resw 1\r | |
| 105 | resw 1\r | |
| 106 | .ESP0: resd 1\r | |
| 107 | .SS0: resw 1\r | |
| 108 | resw 1\r | |
| 109 | .ESP1: resd 1\r | |
| 110 | .SS1: resw 1\r | |
| 111 | resw 1\r | |
| 112 | .ESP2: resd 1\r | |
| 113 | .SS2: resw 1\r | |
| 114 | resw 1\r | |
| 115 | ._CR3: resd 1\r | |
| 116 | .EIP: resd 1\r | |
| 117 | .EFLAGS: resd 1\r | |
| 118 | ._EAX: resd 1\r | |
| 119 | ._ECX: resd 1\r | |
| 120 | ._EDX: resd 1\r | |
| 121 | ._EBX: resd 1\r | |
| 122 | ._ESP: resd 1\r | |
| 123 | ._EBP: resd 1\r | |
| 124 | ._ESI: resd 1\r | |
| 125 | ._EDI: resd 1\r | |
| 126 | ._ES: resw 1\r | |
| 127 | resw 1\r | |
| 128 | ._CS: resw 1\r | |
| 129 | resw 1\r | |
| 130 | ._SS: resw 1\r | |
| 131 | resw 1\r | |
| 132 | ._DS: resw 1\r | |
| 133 | resw 1\r | |
| 134 | ._FS: resw 1\r | |
| 135 | resw 1\r | |
| 136 | ._GS: resw 1\r | |
| 137 | resw 1\r | |
| 138 | .LDT: resw 1\r | |
| 139 | resw 1\r | |
| 140 | resw 1\r | |
| 141 | resw 1\r | |
| 142 | endstruc\r | |
| 143 | \r | |
| 144 | ; Create 2 TSS segments just after GDT\r | |
| 145 | TssDescriptor:\r | |
| 146 | DW 0 ; PreviousTaskLink\r | |
| 147 | DW 0 ; Reserved\r | |
| 148 | DD 0 ; ESP0\r | |
| 149 | DW 0 ; SS0\r | |
| 150 | DW 0 ; Reserved\r | |
| 151 | DD 0 ; ESP1\r | |
| 152 | DW 0 ; SS1\r | |
| 153 | DW 0 ; Reserved\r | |
| 154 | DD 0 ; ESP2\r | |
| 155 | DW 0 ; SS2\r | |
| 156 | DW 0 ; Reserved\r | |
| 157 | DD 0 ; CR3\r | |
| 158 | DD 0 ; EIP\r | |
| 159 | DD 0 ; EFLAGS\r | |
| 160 | DD 0 ; EAX\r | |
| 161 | DD 0 ; ECX\r | |
| 162 | DD 0 ; EDX\r | |
| 163 | DD 0 ; EBX\r | |
| 164 | DD 0 ; ESP\r | |
| 165 | DD 0 ; EBP\r | |
| 166 | DD 0 ; ESI\r | |
| 167 | DD 0 ; EDI\r | |
| 168 | DW 0 ; ES\r | |
| 169 | DW 0 ; Reserved\r | |
| 170 | DW 0 ; CS\r | |
| 171 | DW 0 ; Reserved\r | |
| 172 | DW 0 ; SS\r | |
| 173 | DW 0 ; Reserved\r | |
| 174 | DW 0 ; DS\r | |
| 175 | DW 0 ; Reserved\r | |
| 176 | DW 0 ; FS\r | |
| 177 | DW 0 ; Reserved\r | |
| 178 | DW 0 ; GS\r | |
| 179 | DW 0 ; Reserved\r | |
| 180 | DW 0 ; LDT Selector\r | |
| 181 | DW 0 ; Reserved\r | |
| 182 | DW 0 ; T\r | |
| 183 | DW 0 ; I/O Map Base\r | |
| 184 | TSS_DESC_SIZE equ $ - TssDescriptor\r | |
| 185 | \r | |
| 186 | ExceptionTssDescriptor:\r | |
| 187 | DW 0 ; PreviousTaskLink\r | |
| 188 | DW 0 ; Reserved\r | |
| 189 | DD 0 ; ESP0\r | |
| 190 | DW 0 ; SS0\r | |
| 191 | DW 0 ; Reserved\r | |
| 192 | DD 0 ; ESP1\r | |
| 193 | DW 0 ; SS1\r | |
| 194 | DW 0 ; Reserved\r | |
| 195 | DD 0 ; ESP2\r | |
| 196 | DW 0 ; SS2\r | |
| 197 | DW 0 ; Reserved\r | |
| 198 | DD 0 ; CR3\r | |
| 199 | DD PFHandlerEntry ; EIP\r | |
| 200 | DD 00000002 ; EFLAGS\r | |
| 201 | DD 0 ; EAX\r | |
| 202 | DD 0 ; ECX\r | |
| 203 | DD 0 ; EDX\r | |
| 204 | DD 0 ; EBX\r | |
| 205 | DD 0 ; ESP\r | |
| 206 | DD 0 ; EBP\r | |
| 207 | DD 0 ; ESI\r | |
| 208 | DD 0 ; EDI\r | |
| 209 | DW DATA_SEL ; ES\r | |
| 210 | DW 0 ; Reserved\r | |
| 211 | DW CODE_SEL ; CS\r | |
| 212 | DW 0 ; Reserved\r | |
| 213 | DW DATA_SEL ; SS\r | |
| 214 | DW 0 ; Reserved\r | |
| 215 | DW DATA_SEL ; DS\r | |
| 216 | DW 0 ; Reserved\r | |
| 217 | DW DATA_SEL ; FS\r | |
| 218 | DW 0 ; Reserved\r | |
| 219 | DW DATA_SEL ; GS\r | |
| 220 | DW 0 ; Reserved\r | |
| 221 | DW 0 ; LDT Selector\r | |
| 222 | DW 0 ; Reserved\r | |
| 223 | DW 0 ; T\r | |
| 224 | DW 0 ; I/O Map Base\r | |
| 225 | \r | |
| 226 | ASM_PFX(gcPsd):\r | |
| 227 | DB 'PSDSIG '\r | |
| 228 | DW PSD_SIZE\r | |
| 229 | DW 2\r | |
| 230 | DW 1 << 2\r | |
| 231 | DW CODE_SEL\r | |
| 232 | DW DATA_SEL\r | |
| 233 | DW DATA_SEL\r | |
| 234 | DW DATA_SEL\r | |
| 235 | DW 0\r | |
| 236 | DQ 0\r | |
| 237 | DQ 0\r | |
| 238 | DQ 0\r | |
| 239 | DD 0\r | |
| 240 | DD NullSeg\r | |
| 241 | DD GDT_SIZE\r | |
| 242 | DD 0\r | |
| 243 | times 24 DB 0\r | |
| 244 | DD 0\r | |
| 245 | DD ASM_PFX(gSmiMtrrs)\r | |
| 246 | PSD_SIZE equ $ - ASM_PFX(gcPsd)\r | |
| 247 | \r | |
| 248 | ASM_PFX(gcSmiGdtr):\r | |
| 249 | DW GDT_SIZE - 1\r | |
| 250 | DD NullSeg\r | |
| 251 | \r | |
| 252 | ASM_PFX(gcSmiIdtr):\r | |
| 253 | DW IDT_SIZE - 1\r | |
| 254 | DD _SmiIDT\r | |
| 255 | \r | |
| 256 | _SmiIDT:\r | |
| 257 | %rep 32\r | |
| 258 | DW 0 ; Offset 0:15\r | |
| 259 | DW CODE_SEL ; Segment selector\r | |
| 260 | DB 0 ; Unused\r | |
| 261 | DB 0x8e ; Interrupt Gate, Present\r | |
| 262 | DW 0 ; Offset 16:31\r | |
| 263 | %endrep\r | |
| 264 | \r | |
| 265 | IDT_SIZE equ $ - _SmiIDT\r | |
| 266 | \r | |
| 267 | TaskGateDescriptor:\r | |
| 268 | DW 0 ; Reserved\r | |
| 269 | DW EXCEPTION_TSS_SEL ; TSS Segment selector\r | |
| 270 | DB 0 ; Reserved\r | |
| 271 | DB 0x85 ; Task Gate, present, DPL = 0\r | |
| 272 | DW 0 ; Reserved\r | |
| 273 | \r | |
| 274 | SECTION .text\r | |
| 275 | ;------------------------------------------------------------------------------\r | |
| 276 | ; PageFaultIdtHandlerSmmProfile is the entry point page fault only\r | |
| 277 | ;\r | |
| 278 | ;\r | |
| 279 | ; Stack:\r | |
| 280 | ; +---------------------+\r | |
| 281 | ; + EFlags +\r | |
| 282 | ; +---------------------+\r | |
| 283 | ; + CS +\r | |
| 284 | ; +---------------------+\r | |
| 285 | ; + EIP +\r | |
| 286 | ; +---------------------+\r | |
| 287 | ; + Error Code +\r | |
| 288 | ; +---------------------+\r | |
| 289 | ; + Vector Number +\r | |
| 290 | ; +---------------------+\r | |
| 291 | ; + EBP +\r | |
| 292 | ; +---------------------+ <-- EBP\r | |
| 293 | ;\r | |
| 294 | ;\r | |
| 295 | ;------------------------------------------------------------------------------\r | |
| 296 | global ASM_PFX(PageFaultIdtHandlerSmmProfile)\r | |
| 297 | ASM_PFX(PageFaultIdtHandlerSmmProfile):\r | |
| 298 | push 0xe ; Page Fault\r | |
| 299 | \r | |
| 300 | push ebp\r | |
| 301 | mov ebp, esp\r | |
| 302 | \r | |
| 303 | ;\r | |
| 304 | ; Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32\r | |
| 305 | ; is 16-byte aligned\r | |
| 306 | ;\r | |
| 307 | and esp, 0xfffffff0\r | |
| 308 | sub esp, 12\r | |
| 309 | \r | |
| 310 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
| 311 | push eax\r | |
| 312 | push ecx\r | |
| 313 | push edx\r | |
| 314 | push ebx\r | |
| 315 | lea ecx, [ebp + 6 * 4]\r | |
| 316 | push ecx ; ESP\r | |
| 317 | push dword [ebp] ; EBP\r | |
| 318 | push esi\r | |
| 319 | push edi\r | |
| 320 | \r | |
| 321 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
| 322 | mov eax, ss\r | |
| 323 | push eax\r | |
| 324 | movzx eax, word [ebp + 4 * 4]\r | |
| 325 | push eax\r | |
| 326 | mov eax, ds\r | |
| 327 | push eax\r | |
| 328 | mov eax, es\r | |
| 329 | push eax\r | |
| 330 | mov eax, fs\r | |
| 331 | push eax\r | |
| 332 | mov eax, gs\r | |
| 333 | push eax\r | |
| 334 | \r | |
| 335 | ;; UINT32 Eip;\r | |
| 336 | mov eax, [ebp + 3 * 4]\r | |
| 337 | push eax\r | |
| 338 | \r | |
| 339 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
| 340 | sub esp, 8\r | |
| 341 | sidt [esp]\r | |
| 342 | mov eax, [esp + 2]\r | |
| 343 | xchg eax, [esp]\r | |
| 344 | and eax, 0xFFFF\r | |
| 345 | mov [esp+4], eax\r | |
| 346 | \r | |
| 347 | sub esp, 8\r | |
| 348 | sgdt [esp]\r | |
| 349 | mov eax, [esp + 2]\r | |
| 350 | xchg eax, [esp]\r | |
| 351 | and eax, 0xFFFF\r | |
| 352 | mov [esp+4], eax\r | |
| 353 | \r | |
| 354 | ;; UINT32 Ldtr, Tr;\r | |
| 355 | xor eax, eax\r | |
| 356 | str ax\r | |
| 357 | push eax\r | |
| 358 | sldt ax\r | |
| 359 | push eax\r | |
| 360 | \r | |
| 361 | ;; UINT32 EFlags;\r | |
| 362 | mov eax, [ebp + 5 * 4]\r | |
| 363 | push eax\r | |
| 364 | \r | |
| 365 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
| 366 | mov eax, cr4\r | |
| 367 | or eax, 0x208\r | |
| 368 | mov cr4, eax\r | |
| 369 | push eax\r | |
| 370 | mov eax, cr3\r | |
| 371 | push eax\r | |
| 372 | mov eax, cr2\r | |
| 373 | push eax\r | |
| 374 | xor eax, eax\r | |
| 375 | push eax\r | |
| 376 | mov eax, cr0\r | |
| 377 | push eax\r | |
| 378 | \r | |
| 379 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
| 380 | mov eax, dr7\r | |
| 381 | push eax\r | |
| 382 | mov eax, dr6\r | |
| 383 | push eax\r | |
| 384 | mov eax, dr3\r | |
| 385 | push eax\r | |
| 386 | mov eax, dr2\r | |
| 387 | push eax\r | |
| 388 | mov eax, dr1\r | |
| 389 | push eax\r | |
| 390 | mov eax, dr0\r | |
| 391 | push eax\r | |
| 392 | \r | |
| 393 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
| 394 | sub esp, 512\r | |
| 395 | mov edi, esp\r | |
| 396 | db 0xf, 0xae, 0x7 ;fxsave [edi]\r | |
| 397 | \r | |
| 398 | ; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear\r | |
| 399 | cld\r | |
| 400 | \r | |
| 401 | ;; UINT32 ExceptionData;\r | |
| 402 | push dword [ebp + 2 * 4]\r | |
| 403 | \r | |
| 404 | ;; call into exception handler\r | |
| 405 | \r | |
| 406 | ;; Prepare parameter and call\r | |
| 407 | mov edx, esp\r | |
| 408 | push edx\r | |
| 409 | mov edx, dword [ebp + 1 * 4]\r | |
| 410 | push edx\r | |
| 411 | \r | |
| 412 | ;\r | |
| 413 | ; Call External Exception Handler\r | |
| 414 | ;\r | |
| 415 | mov eax, ASM_PFX(SmiPFHandler)\r | |
| 416 | call eax\r | |
| 417 | add esp, 8\r | |
| 418 | \r | |
| 419 | ;; UINT32 ExceptionData;\r | |
| 420 | add esp, 4\r | |
| 421 | \r | |
| 422 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
| 423 | mov esi, esp\r | |
| 424 | db 0xf, 0xae, 0xe ; fxrstor [esi]\r | |
| 425 | add esp, 512\r | |
| 426 | \r | |
| 427 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
| 428 | ;; Skip restoration of DRx registers to support debuggers\r | |
| 429 | ;; that set breakpoint in interrupt/exception context\r | |
| 430 | add esp, 4 * 6\r | |
| 431 | \r | |
| 432 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
| 433 | pop eax\r | |
| 434 | mov cr0, eax\r | |
| 435 | add esp, 4 ; not for Cr1\r | |
| 436 | pop eax\r | |
| 437 | mov cr2, eax\r | |
| 438 | pop eax\r | |
| 439 | mov cr3, eax\r | |
| 440 | pop eax\r | |
| 441 | mov cr4, eax\r | |
| 442 | \r | |
| 443 | ;; UINT32 EFlags;\r | |
| 444 | pop dword [ebp + 5 * 4]\r | |
| 445 | \r | |
| 446 | ;; UINT32 Ldtr, Tr;\r | |
| 447 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
| 448 | ;; Best not let anyone mess with these particular registers...\r | |
| 449 | add esp, 24\r | |
| 450 | \r | |
| 451 | ;; UINT32 Eip;\r | |
| 452 | pop dword [ebp + 3 * 4]\r | |
| 453 | \r | |
| 454 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
| 455 | ;; NOTE - modified segment registers could hang the debugger... We\r | |
| 456 | ;; could attempt to insulate ourselves against this possibility,\r | |
| 457 | ;; but that poses risks as well.\r | |
| 458 | ;;\r | |
| 459 | pop gs\r | |
| 460 | pop fs\r | |
| 461 | pop es\r | |
| 462 | pop ds\r | |
| 463 | pop dword [ebp + 4 * 4]\r | |
| 464 | pop ss\r | |
| 465 | \r | |
| 466 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
| 467 | pop edi\r | |
| 468 | pop esi\r | |
| 469 | add esp, 4 ; not for ebp\r | |
| 470 | add esp, 4 ; not for esp\r | |
| 471 | pop ebx\r | |
| 472 | pop edx\r | |
| 473 | pop ecx\r | |
| 474 | pop eax\r | |
| 475 | \r | |
| 476 | mov esp, ebp\r | |
| 477 | pop ebp\r | |
| 478 | \r | |
| 479 | ; Enable TF bit after page fault handler runs\r | |
| 480 | bts dword [esp + 16], 8 ; EFLAGS\r | |
| 481 | \r | |
| 482 | add esp, 8 ; skip INT# & ErrCode\r | |
| 483 | Return:\r | |
| 484 | iretd\r | |
| 485 | ;\r | |
| 486 | ; Page Fault Exception Handler entry when SMM Stack Guard is enabled\r | |
| 487 | ; Executiot starts here after a task switch\r | |
| 488 | ;\r | |
| 489 | PFHandlerEntry:\r | |
| 490 | ;\r | |
| 491 | ; Get this processor's TSS\r | |
| 492 | ;\r | |
| 493 | sub esp, 8\r | |
| 494 | sgdt [esp + 2]\r | |
| 495 | mov eax, [esp + 4] ; GDT base\r | |
| 496 | add esp, 8\r | |
| 497 | mov ecx, [eax + TSS_SEL + 2]\r | |
| 498 | shl ecx, 8\r | |
| 499 | mov cl, [eax + TSS_SEL + 7]\r | |
| 500 | ror ecx, 8 ; ecx = TSS base\r | |
| 501 | \r | |
| 502 | mov ebp, esp\r | |
| 503 | \r | |
| 504 | ;\r | |
| 505 | ; Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32\r | |
| 506 | ; is 16-byte aligned\r | |
| 507 | ;\r | |
| 508 | and esp, 0xfffffff0\r | |
| 509 | sub esp, 12\r | |
| 510 | \r | |
| 511 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
| 512 | push dword [ecx + IA32_TSS._EAX]\r | |
| 513 | push dword [ecx + IA32_TSS._ECX]\r | |
| 514 | push dword [ecx + IA32_TSS._EDX]\r | |
| 515 | push dword [ecx + IA32_TSS._EBX]\r | |
| 516 | push dword [ecx + IA32_TSS._ESP]\r | |
| 517 | push dword [ecx + IA32_TSS._EBP]\r | |
| 518 | push dword [ecx + IA32_TSS._ESI]\r | |
| 519 | push dword [ecx + IA32_TSS._EDI]\r | |
| 520 | \r | |
| 521 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
| 522 | movzx eax, word [ecx + IA32_TSS._SS]\r | |
| 523 | push eax\r | |
| 524 | movzx eax, word [ecx + IA32_TSS._CS]\r | |
| 525 | push eax\r | |
| 526 | movzx eax, word [ecx + IA32_TSS._DS]\r | |
| 527 | push eax\r | |
| 528 | movzx eax, word [ecx + IA32_TSS._ES]\r | |
| 529 | push eax\r | |
| 530 | movzx eax, word [ecx + IA32_TSS._FS]\r | |
| 531 | push eax\r | |
| 532 | movzx eax, word [ecx + IA32_TSS._GS]\r | |
| 533 | push eax\r | |
| 534 | \r | |
| 535 | ;; UINT32 Eip;\r | |
| 536 | push dword [ecx + IA32_TSS.EIP]\r | |
| 537 | \r | |
| 538 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
| 539 | sub esp, 8\r | |
| 540 | sidt [esp]\r | |
| 541 | mov eax, [esp + 2]\r | |
| 542 | xchg eax, [esp]\r | |
| 543 | and eax, 0xFFFF\r | |
| 544 | mov [esp+4], eax\r | |
| 545 | \r | |
| 546 | sub esp, 8\r | |
| 547 | sgdt [esp]\r | |
| 548 | mov eax, [esp + 2]\r | |
| 549 | xchg eax, [esp]\r | |
| 550 | and eax, 0xFFFF\r | |
| 551 | mov [esp+4], eax\r | |
| 552 | \r | |
| 553 | ;; UINT32 Ldtr, Tr;\r | |
| 554 | mov eax, TSS_SEL\r | |
| 555 | push eax\r | |
| 556 | movzx eax, word [ecx + IA32_TSS.LDT]\r | |
| 557 | push eax\r | |
| 558 | \r | |
| 559 | ;; UINT32 EFlags;\r | |
| 560 | push dword [ecx + IA32_TSS.EFLAGS]\r | |
| 561 | \r | |
| 562 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
| 563 | mov eax, cr4\r | |
| 564 | or eax, 0x208\r | |
| 565 | mov cr4, eax\r | |
| 566 | push eax\r | |
| 567 | mov eax, cr3\r | |
| 568 | push eax\r | |
| 569 | mov eax, cr2\r | |
| 570 | push eax\r | |
| 571 | xor eax, eax\r | |
| 572 | push eax\r | |
| 573 | mov eax, cr0\r | |
| 574 | push eax\r | |
| 575 | \r | |
| 576 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
| 577 | mov eax, dr7\r | |
| 578 | push eax\r | |
| 579 | mov eax, dr6\r | |
| 580 | push eax\r | |
| 581 | mov eax, dr3\r | |
| 582 | push eax\r | |
| 583 | mov eax, dr2\r | |
| 584 | push eax\r | |
| 585 | mov eax, dr1\r | |
| 586 | push eax\r | |
| 587 | mov eax, dr0\r | |
| 588 | push eax\r | |
| 589 | \r | |
| 590 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
| 591 | ;; Clear TS bit in CR0 to avoid Device Not Available Exception (#NM)\r | |
| 592 | ;; when executing fxsave/fxrstor instruction\r | |
| 593 | clts\r | |
| 594 | sub esp, 512\r | |
| 595 | mov edi, esp\r | |
| 596 | db 0xf, 0xae, 0x7 ;fxsave [edi]\r | |
| 597 | \r | |
| 598 | ; UEFI calling convention for IA32 requires that Direction flag in EFLAGs is clear\r | |
| 599 | cld\r | |
| 600 | \r | |
| 601 | ;; UINT32 ExceptionData;\r | |
| 602 | push dword [ebp]\r | |
| 603 | \r | |
| 604 | ;; call into exception handler\r | |
| 605 | mov ebx, ecx\r | |
| 606 | mov eax, ASM_PFX(SmiPFHandler)\r | |
| 607 | \r | |
| 608 | ;; Prepare parameter and call\r | |
| 609 | mov edx, esp\r | |
| 610 | push edx\r | |
| 611 | mov edx, 14\r | |
| 612 | push edx\r | |
| 613 | \r | |
| 614 | ;\r | |
| 615 | ; Call External Exception Handler\r | |
| 616 | ;\r | |
| 617 | call eax\r | |
| 618 | add esp, 8\r | |
| 619 | \r | |
| 620 | mov ecx, ebx\r | |
| 621 | ;; UINT32 ExceptionData;\r | |
| 622 | add esp, 4\r | |
| 623 | \r | |
| 624 | ;; FX_SAVE_STATE_IA32 FxSaveState;\r | |
| 625 | mov esi, esp\r | |
| 626 | db 0xf, 0xae, 0xe ; fxrstor [esi]\r | |
| 627 | add esp, 512\r | |
| 628 | \r | |
| 629 | ;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;\r | |
| 630 | ;; Skip restoration of DRx registers to support debuggers\r | |
| 631 | ;; that set breakpoints in interrupt/exception context\r | |
| 632 | add esp, 4 * 6\r | |
| 633 | \r | |
| 634 | ;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;\r | |
| 635 | pop eax\r | |
| 636 | mov cr0, eax\r | |
| 637 | add esp, 4 ; not for Cr1\r | |
| 638 | pop eax\r | |
| 639 | mov cr2, eax\r | |
| 640 | pop eax\r | |
| 641 | mov dword [ecx + IA32_TSS._CR3], eax\r | |
| 642 | pop eax\r | |
| 643 | mov cr4, eax\r | |
| 644 | \r | |
| 645 | ;; UINT32 EFlags;\r | |
| 646 | pop dword [ecx + IA32_TSS.EFLAGS]\r | |
| 647 | \r | |
| 648 | ;; UINT32 Ldtr, Tr;\r | |
| 649 | ;; UINT32 Gdtr[2], Idtr[2];\r | |
| 650 | ;; Best not let anyone mess with these particular registers...\r | |
| 651 | add esp, 24\r | |
| 652 | \r | |
| 653 | ;; UINT32 Eip;\r | |
| 654 | pop dword [ecx + IA32_TSS.EIP]\r | |
| 655 | \r | |
| 656 | ;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;\r | |
| 657 | ;; NOTE - modified segment registers could hang the debugger... We\r | |
| 658 | ;; could attempt to insulate ourselves against this possibility,\r | |
| 659 | ;; but that poses risks as well.\r | |
| 660 | ;;\r | |
| 661 | pop eax\r | |
| 662 | o16 mov [ecx + IA32_TSS._GS], ax\r | |
| 663 | pop eax\r | |
| 664 | o16 mov [ecx + IA32_TSS._FS], ax\r | |
| 665 | pop eax\r | |
| 666 | o16 mov [ecx + IA32_TSS._ES], ax\r | |
| 667 | pop eax\r | |
| 668 | o16 mov [ecx + IA32_TSS._DS], ax\r | |
| 669 | pop eax\r | |
| 670 | o16 mov [ecx + IA32_TSS._CS], ax\r | |
| 671 | pop eax\r | |
| 672 | o16 mov [ecx + IA32_TSS._SS], ax\r | |
| 673 | \r | |
| 674 | ;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;\r | |
| 675 | pop dword [ecx + IA32_TSS._EDI]\r | |
| 676 | pop dword [ecx + IA32_TSS._ESI]\r | |
| 677 | add esp, 4 ; not for ebp\r | |
| 678 | add esp, 4 ; not for esp\r | |
| 679 | pop dword [ecx + IA32_TSS._EBX]\r | |
| 680 | pop dword [ecx + IA32_TSS._EDX]\r | |
| 681 | pop dword [ecx + IA32_TSS._ECX]\r | |
| 682 | pop dword [ecx + IA32_TSS._EAX]\r | |
| 683 | \r | |
| 684 | mov esp, ebp\r | |
| 685 | \r | |
| 686 | ; Set single step DB# if SMM profile is enabled and page fault exception happens\r | |
| 687 | cmp byte [dword ASM_PFX(FeaturePcdGet (PcdCpuSmmProfileEnable))], 0\r | |
| 688 | jz @Done2\r | |
| 689 | \r | |
| 690 | ; Create return context for iretd in stub function\r | |
| 691 | mov eax, dword [ecx + IA32_TSS._ESP] ; Get old stack pointer\r | |
| 692 | mov ebx, dword [ecx + IA32_TSS.EIP]\r | |
| 693 | mov [eax - 0xc], ebx ; create EIP in old stack\r | |
| 694 | movzx ebx, word [ecx + IA32_TSS._CS]\r | |
| 695 | mov [eax - 0x8], ebx ; create CS in old stack\r | |
| 696 | mov ebx, dword [ecx + IA32_TSS.EFLAGS]\r | |
| 697 | bts ebx, 8\r | |
| 698 | mov [eax - 0x4], ebx ; create eflags in old stack\r | |
| 699 | mov eax, dword [ecx + IA32_TSS._ESP] ; Get old stack pointer\r | |
| 700 | sub eax, 0xc ; minus 12 byte\r | |
| 701 | mov dword [ecx + IA32_TSS._ESP], eax ; Set new stack pointer\r | |
| 702 | ; Replace the EIP of interrupted task with stub function\r | |
| 703 | mov eax, ASM_PFX(PageFaultStubFunction)\r | |
| 704 | mov dword [ecx + IA32_TSS.EIP], eax\r | |
| 705 | ; Jump to the iretd so next page fault handler as a task will start again after iretd.\r | |
| 706 | @Done2:\r | |
| 707 | add esp, 4 ; skip ErrCode\r | |
| 708 | \r | |
| 709 | jmp Return\r | |
| 710 | \r | |
| 711 | global ASM_PFX(PageFaultStubFunction)\r | |
| 712 | ASM_PFX(PageFaultStubFunction):\r | |
| 713 | ;\r | |
| 714 | ; we need clean TS bit in CR0 to execute\r | |
| 715 | ; x87 FPU/MMX/SSE/SSE2/SSE3/SSSE3/SSE4 instructions.\r | |
| 716 | ;\r | |
| 717 | clts\r | |
| 718 | iretd\r | |
| 719 | \r | |
| 720 | global ASM_PFX(InitializeIDTSmmStackGuard)\r | |
| 721 | ASM_PFX(InitializeIDTSmmStackGuard):\r | |
| 722 | push ebx\r | |
| 723 | ;\r | |
| 724 | ; If SMM Stack Guard feature is enabled, the Page Fault Exception entry in IDT\r | |
| 725 | ; is a Task Gate Descriptor so that when a Page Fault Exception occurrs,\r | |
| 726 | ; the processors can use a known good stack in case stack is ran out.\r | |
| 727 | ;\r | |
| 728 | lea ebx, [_SmiIDT + 14 * 8]\r | |
| 729 | lea edx, [TaskGateDescriptor]\r | |
| 730 | mov eax, [edx]\r | |
| 731 | mov [ebx], eax\r | |
| 732 | mov eax, [edx + 4]\r | |
| 733 | mov [ebx + 4], eax\r | |
| 734 | pop ebx\r | |
| 735 | ret\r |