psctxalp.c File Reference

#include "psp.h"

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Functions
VOID	PspGetContext (IN PKTRAP_FRAME TrapFrame, IN PKNONVOLATILE_CONTEXT_POINTERS ContextPointers, IN OUT PCONTEXT ContextRecord)
VOID	PspSetContext (IN OUT PKTRAP_FRAME TrapFrame, IN PKNONVOLATILE_CONTEXT_POINTERS ContextPointers, IN PCONTEXT ContextRecord, IN KPROCESSOR_MODE ProcessorMode)
VOID	PspGetSetContextSpecialApcMain (IN PKAPC Apc, IN PKNORMAL_ROUTINE *NormalRoutine, IN PVOID *NormalContext, IN PVOID *SystemArgument1, IN PVOID *SystemArgument2)

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Function Documentation

VOID PspGetContext (  IN PKTRAP_FRAME  TrapFrame, IN PKNONVOLATILE_CONTEXT_POINTERS  ContextPointers, IN OUT PCONTEXT  ContextRecord )

Definition at line 29 of file psctxalp.c. 00037 : 00038 00039 This function selectively moves the contents of the specified trap frame 00040 and nonvolatile context to the specified context record. 00041 00042 Arguments: 00043 00044 TrapFrame - Supplies a pointer to a trap frame. 00045 00046 ContextPointers - Supplies the address of context pointers record. 00047 00048 ContextRecord - Supplies the address of a context record. 00049 00050 Return Value: 00051 00052 None. 00053 00054 --*/ 00055 00056 { 00057 00058 // 00059 // Get control information if specified. 00060 // 00061 00062 if ((ContextRecord->ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL) { 00063 00064 // 00065 // Get integer registers gp, ra, sp, FIR, and PSR from trap frame. 00066 // 00067 00068 ContextRecord->IntGp = TrapFrame->IntGp; 00069 ContextRecord->IntSp = TrapFrame->IntSp; 00070 ContextRecord->IntRa = TrapFrame->IntRa; 00071 ContextRecord->Fir = TrapFrame->Fir; 00072 ContextRecord->Psr = TrapFrame->Psr; 00073 } 00074 00075 // 00076 // Get integer register contents if specified. 00077 // 00078 00079 if ((ContextRecord->ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER) { 00080 00081 // 00082 // Get volatile integer registers v0 and t0 - t7 from trap frame. 00083 // 00084 00085 ContextRecord->IntV0 = TrapFrame->IntV0; 00086 ContextRecord->IntT0 = TrapFrame->IntT0; 00087 ContextRecord->IntT1 = TrapFrame->IntT1; 00088 ContextRecord->IntT2 = TrapFrame->IntT2; 00089 ContextRecord->IntT3 = TrapFrame->IntT3; 00090 ContextRecord->IntT4 = TrapFrame->IntT4; 00091 ContextRecord->IntT5 = TrapFrame->IntT5; 00092 ContextRecord->IntT6 = TrapFrame->IntT6; 00093 ContextRecord->IntT7 = TrapFrame->IntT7; 00094 00095 // 00096 // Get nonvolatile integer registers s0 - s5 through context pointers. 00097 // 00098 00099 ContextRecord->IntS0 = *ContextPointers->IntS0; 00100 ContextRecord->IntS1 = *ContextPointers->IntS1; 00101 ContextRecord->IntS2 = *ContextPointers->IntS2; 00102 ContextRecord->IntS3 = *ContextPointers->IntS3; 00103 ContextRecord->IntS4 = *ContextPointers->IntS4; 00104 ContextRecord->IntS5 = *ContextPointers->IntS5; 00105 00106 // 00107 // Get volatile integer registers fp/s6, a0 - a5, and t8 - t12 from 00108 // trap frame. 00109 // 00110 00111 ContextRecord->IntFp = TrapFrame->IntFp; 00112 00113 ContextRecord->IntA0 = TrapFrame->IntA0; 00114 ContextRecord->IntA1 = TrapFrame->IntA1; 00115 ContextRecord->IntA2 = TrapFrame->IntA2; 00116 ContextRecord->IntA3 = TrapFrame->IntA3; 00117 ContextRecord->IntA4 = TrapFrame->IntA4; 00118 ContextRecord->IntA5 = TrapFrame->IntA5; 00119 00120 ContextRecord->IntT8 = TrapFrame->IntT8; 00121 ContextRecord->IntT9 = TrapFrame->IntT9; 00122 ContextRecord->IntT10 = TrapFrame->IntT10; 00123 ContextRecord->IntT11 = TrapFrame->IntT11; 00124 ContextRecord->IntT12 = TrapFrame->IntT12; 00125 00126 // 00127 // Get volatile integer register AT from trap frame. 00128 // Get integer register zero. 00129 // 00130 00131 ContextRecord->IntAt = TrapFrame->IntAt; 00132 ContextRecord->IntZero = 0; 00133 } 00134 00135 // 00136 // Get floating register contents if specified. 00137 // 00138 00139 if ((ContextRecord->ContextFlags & CONTEXT_FLOATING_POINT) == CONTEXT_FLOATING_POINT) { 00140 00141 // 00142 // Get volatile floating registers f0 - f1 from trap frame. 00143 // 00144 00145 ContextRecord->FltF0 = TrapFrame->FltF0; 00146 ContextRecord->FltF1 = TrapFrame->FltF1; 00147 00148 // 00149 // Get volatile floating registers f10 - f30 from trap frame. 00150 // This assumes that f10 - f30 are contiguous in the trap frame. 00151 // 00152 00153 ASSERT((&ContextRecord->FltF30 - &ContextRecord->FltF10) == 20); 00154 RtlMoveMemory(&ContextRecord->FltF10, &TrapFrame->FltF10, 00155 sizeof(ULONGLONG) * 21); 00156 00157 ContextRecord->FltF31 = 0; 00158 00159 // 00160 // Get nonvolatile floating registers f2 - f9 through context pointers. 00161 // 00162 00163 ContextRecord->FltF2 = *ContextPointers->FltF2; 00164 ContextRecord->FltF3 = *ContextPointers->FltF3; 00165 ContextRecord->FltF4 = *ContextPointers->FltF4; 00166 ContextRecord->FltF5 = *ContextPointers->FltF5; 00167 ContextRecord->FltF6 = *ContextPointers->FltF6; 00168 ContextRecord->FltF7 = *ContextPointers->FltF7; 00169 ContextRecord->FltF8 = *ContextPointers->FltF8; 00170 ContextRecord->FltF9 = *ContextPointers->FltF9; 00171 00172 // 00173 // Get floating point control register from trap frame. 00174 // Get the current software FPCR value from the TEB. 00175 // 00176 00177 ContextRecord->Fpcr = TrapFrame->Fpcr; 00178 try { 00179 ContextRecord->SoftFpcr = 00180 (ULONGLONG)(NtCurrentTeb()->FpSoftwareStatusRegister); 00181 00182 } except (EXCEPTION_EXECUTE_HANDLER) { 00183 ContextRecord->SoftFpcr = 0; 00184 } 00185 } 00186 00187 return; 00188 }

VOID PspGetSetContextSpecialApcMain (  IN PKAPC  Apc, IN PKNORMAL_ROUTINE *  NormalRoutine, IN PVOID *  NormalContext, IN PVOID *  SystemArgument1, IN PVOID *  SystemArgument2 )

Definition at line 349 of file psctxalp.c. References _GETSETCONTEXT::Context, FALSE, _KTHREAD::InitialStack, KeSetEvent(), _GETSETCONTEXT::Mode, NULL, _GETSETCONTEXT::OperationComplete, PsGetCurrentThread, PspGetContext(), PspSetContext(), RtlLookupFunctionEntry(), RtlVirtualUnwind(), and _ETHREAD::Tcb. 00359 : 00360 00361 This function either captures the user mode state of the current 00362 thread, or sets the user mode state of the current thread. The 00363 operation type is determined by the value of SystemArgument1. A 00364 zero value is used for get context, and a nonzero value is used 00365 for set context. 00366 00367 Arguments: 00368 00369 Apc - Supplies a pointer to the APC control object that caused entry 00370 into this routine. 00371 00372 NormalRoutine - Supplies a pointer to the normal routine function that 00373 was specified when the APC was initialized. This parameter is not 00374 used. 00375 00376 NormalContext - Supplies a pointer to an arbitrary data structure that 00377 was specified when the APC was initialized. This parameter is not 00378 used. 00379 00380 SystemArgument1, SystemArgument2 - Supplies a set of two pointer to two 00381 arguments that contain untyped data. These parameters are not used. 00382 00383 Return Value: 00384 00385 None. 00386 00387 --*/ 00388 00389 { 00390 00391 PGETSETCONTEXT ContextBlock; 00392 KNONVOLATILE_CONTEXT_POINTERS ContextPointers; 00393 CONTEXT ContextRecord; 00394 ULONG_PTR ControlPc; 00395 FRAME_POINTERS EstablisherFrame; 00396 PRUNTIME_FUNCTION FunctionEntry; 00397 BOOLEAN InFunction; 00398 PETHREAD Thread; 00399 ULONGLONG TrapFrame1; 00400 ULONGLONG TrapFrame2; 00401 00402 // 00403 // Get the address of the context block and compute the address of the 00404 // system entry trap frame. 00405 // 00406 00407 ContextBlock = CONTAINING_RECORD(Apc, GETSETCONTEXT, Apc); 00408 Thread = PsGetCurrentThread(); 00409 TrapFrame1 = (ULONGLONG)(LONG_PTR)Thread->Tcb.InitialStack - KTRAP_FRAME_LENGTH; 00410 00411 // 00412 // The lower bounds for locating the first system service trap frame on 00413 // the kernel stack is one trap frame below TrapFrame1. 00414 // 00415 00416 TrapFrame2 = TrapFrame1 - KTRAP_FRAME_LENGTH; 00417 00418 // 00419 // Capture the current thread context and set the initial control PC 00420 // value. 00421 // 00422 00423 RtlCaptureContext(&ContextRecord); 00424 ControlPc = (ULONG_PTR)ContextRecord.IntRa; 00425 00426 // 00427 // Initialize context pointers for the nonvolatile integer and floating 00428 // registers. 00429 // 00430 00431 ContextPointers.IntS0 = &ContextRecord.IntS0; 00432 ContextPointers.IntS1 = &ContextRecord.IntS1; 00433 ContextPointers.IntS2 = &ContextRecord.IntS2; 00434 ContextPointers.IntS3 = &ContextRecord.IntS3; 00435 ContextPointers.IntS4 = &ContextRecord.IntS4; 00436 ContextPointers.IntS5 = &ContextRecord.IntS5; 00437 00438 ContextPointers.FltF2 = &ContextRecord.FltF2; 00439 ContextPointers.FltF3 = &ContextRecord.FltF3; 00440 ContextPointers.FltF4 = &ContextRecord.FltF4; 00441 ContextPointers.FltF5 = &ContextRecord.FltF5; 00442 ContextPointers.FltF6 = &ContextRecord.FltF6; 00443 ContextPointers.FltF7 = &ContextRecord.FltF7; 00444 ContextPointers.FltF8 = &ContextRecord.FltF8; 00445 ContextPointers.FltF9 = &ContextRecord.FltF9; 00446 00447 // 00448 // Start with the frame specified by the context record and virtually 00449 // unwind call frames until the system entry trap frame is encountered. 00450 // 00451 00452 do { 00453 00454 // 00455 // Lookup the function table entry using the point at which control 00456 // left the procedure. 00457 // 00458 00459 FunctionEntry = RtlLookupFunctionEntry(ControlPc); 00460 00461 // 00462 // If there is a function table entry for the routine, then virtually 00463 // unwind to the caller of the current routine to obtain the address 00464 // where control left the caller. Otherwise, the function is a leaf 00465 // function and the return address register contains the address of 00466 // where control left the caller. 00467 // 00468 00469 if (FunctionEntry != NULL) { 00470 ControlPc = RtlVirtualUnwind(ControlPc, 00471 FunctionEntry, 00472 &ContextRecord, 00473 &InFunction, 00474 &EstablisherFrame, 00475 &ContextPointers); 00476 00477 } else { 00478 ControlPc = (ULONG_PTR)ContextRecord.IntRa; 00479 } 00480 00481 // 00482 // N.B. The virtual frame pointer of the kernel frame just below the 00483 // trap frame may not be exactly equal to TrapFrame1 since the trap 00484 // code can allocate additional stack space (for local variables or 00485 // system service arguments). Therefore we must check for a range of 00486 // values at or below TrapFrame1, but also above TrapFrame2 (so in 00487 // case there is more than one trap frame on the stack, we get the 00488 // one at the top. 00489 // 00490 00491 } while ((ContextRecord.IntSp != TrapFrame1) && 00492 ((ContextRecord.IntSp < TrapFrame2) || 00493 (ControlPc < PCR->SystemServiceDispatchStart) || 00494 (ControlPc >= PCR->SystemServiceDispatchEnd))); 00495 00496 // 00497 // If system argument one is nonzero, then set the context of the current 00498 // thread. Otherwise, get the context of the current thread. 00499 // 00500 00501 if (Apc->SystemArgument1 != 0) { 00502 00503 // 00504 // Set context of current thread. 00505 // 00506 00507 PspSetContext((PKTRAP_FRAME)TrapFrame1, 00508 &ContextPointers, 00509 &ContextBlock->Context, 00510 ContextBlock->Mode); 00511 00512 } else { 00513 00514 // 00515 // Get context of current thread. 00516 // 00517 00518 PspGetContext((PKTRAP_FRAME)TrapFrame1, 00519 &ContextPointers, 00520 &ContextBlock->Context); 00521 } 00522 00523 KeSetEvent(&ContextBlock->OperationComplete, 0, FALSE); 00524 return; 00525 } }

VOID PspSetContext (  IN OUT PKTRAP_FRAME  TrapFrame, IN PKNONVOLATILE_CONTEXT_POINTERS  ContextPointers, IN PCONTEXT  ContextRecord, IN KPROCESSOR_MODE  ProcessorMode )

Definition at line 191 of file psctxalp.c. References ASSERT, CONTEXT_CONTROL, CONTEXT_FLOATING_POINT, CONTEXT_INTEGER, and EXCEPTION_EXECUTE_HANDLER. 00200 : 00201 00202 This function selectively moves the contents of the specified context 00203 record to the specified trap frame and nonvolatile context. 00204 00205 Arguments: 00206 00207 TrapFrame - Supplies the address of a trap frame. 00208 00209 ContextPointers - Supplies the address of a context pointers record. 00210 00211 ContextRecord - Supplies the address of a context record. 00212 00213 ProcessorMode - Supplies the processor mode to use when sanitizing 00214 the PSR and FSR. 00215 00216 Return Value: 00217 00218 None. 00219 00220 --*/ 00221 00222 { 00223 00224 // 00225 // Set control information if specified. 00226 // 00227 00228 if ((ContextRecord->ContextFlags & CONTEXT_CONTROL) == CONTEXT_CONTROL) { 00229 00230 // 00231 // Set integer registers gp, sp, ra, FIR, and PSR in trap frame. 00232 // 00233 00234 TrapFrame->IntGp = ContextRecord->IntGp; 00235 TrapFrame->IntSp = ContextRecord->IntSp; 00236 TrapFrame->IntRa = ContextRecord->IntRa; 00237 TrapFrame->Fir = ContextRecord->Fir; 00238 TrapFrame->Psr = SANITIZE_PSR(ContextRecord->Psr, ProcessorMode); 00239 } 00240 00241 // 00242 // Set integer register contents if specified. 00243 // 00244 00245 if ((ContextRecord->ContextFlags & CONTEXT_INTEGER) == CONTEXT_INTEGER) { 00246 00247 // 00248 // Set volatile integer registers v0 and t0 - t7 in trap frame. 00249 // 00250 00251 TrapFrame->IntV0 = ContextRecord->IntV0; 00252 TrapFrame->IntT0 = ContextRecord->IntT0; 00253 TrapFrame->IntT1 = ContextRecord->IntT1; 00254 TrapFrame->IntT2 = ContextRecord->IntT2; 00255 TrapFrame->IntT3 = ContextRecord->IntT3; 00256 TrapFrame->IntT4 = ContextRecord->IntT4; 00257 TrapFrame->IntT5 = ContextRecord->IntT5; 00258 TrapFrame->IntT6 = ContextRecord->IntT6; 00259 TrapFrame->IntT7 = ContextRecord->IntT7; 00260 00261 // 00262 // Set nonvolatile integer registers s0 - s5 through context pointers. 00263 // 00264 00265 *ContextPointers->IntS0 = ContextRecord->IntS0; 00266 *ContextPointers->IntS1 = ContextRecord->IntS1; 00267 *ContextPointers->IntS2 = ContextRecord->IntS2; 00268 *ContextPointers->IntS3 = ContextRecord->IntS3; 00269 *ContextPointers->IntS4 = ContextRecord->IntS4; 00270 *ContextPointers->IntS5 = ContextRecord->IntS5; 00271 00272 // 00273 // Set volatile integer registers fp/s6, a0 - a5, t8 - t12, and AT 00274 // in trap frame. 00275 // 00276 00277 TrapFrame->IntFp = ContextRecord->IntFp; 00278 00279 TrapFrame->IntA0 = ContextRecord->IntA0; 00280 TrapFrame->IntA1 = ContextRecord->IntA1; 00281 TrapFrame->IntA2 = ContextRecord->IntA2; 00282 TrapFrame->IntA3 = ContextRecord->IntA3; 00283 TrapFrame->IntA4 = ContextRecord->IntA4; 00284 TrapFrame->IntA5 = ContextRecord->IntA5; 00285 00286 TrapFrame->IntT8 = ContextRecord->IntT8; 00287 TrapFrame->IntT9 = ContextRecord->IntT9; 00288 TrapFrame->IntT10 = ContextRecord->IntT10; 00289 TrapFrame->IntT11 = ContextRecord->IntT11; 00290 TrapFrame->IntT12 = ContextRecord->IntT12; 00291 00292 TrapFrame->IntAt = ContextRecord->IntAt; 00293 } 00294 00295 // 00296 // Set floating register contents if specified. 00297 // 00298 00299 if ((ContextRecord->ContextFlags & CONTEXT_FLOATING_POINT) == CONTEXT_FLOATING_POINT) { 00300 00301 // 00302 // Set volatile floating registers f0 - f1 in trap frame. 00303 // 00304 00305 TrapFrame->FltF0 = ContextRecord->FltF0; 00306 TrapFrame->FltF1 = ContextRecord->FltF1; 00307 00308 // 00309 // Set volatile floating registers f10 - f30 in trap frame. 00310 // This assumes that f10 - f30 are contiguous in the trap frame. 00311 // 00312 00313 ASSERT((&ContextRecord->FltF30 - &ContextRecord->FltF10) == 20); 00314 RtlMoveMemory(&TrapFrame->FltF10, &ContextRecord->FltF10, 00315 sizeof(ULONGLONG) * 21); 00316 00317 // 00318 // Set nonvolatile floating registers f2 - f9 through context pointers. 00319 // 00320 00321 *ContextPointers->FltF2 = ContextRecord->FltF2; 00322 *ContextPointers->FltF3 = ContextRecord->FltF3; 00323 *ContextPointers->FltF4 = ContextRecord->FltF4; 00324 *ContextPointers->FltF5 = ContextRecord->FltF5; 00325 *ContextPointers->FltF6 = ContextRecord->FltF6; 00326 *ContextPointers->FltF7 = ContextRecord->FltF7; 00327 *ContextPointers->FltF8 = ContextRecord->FltF8; 00328 *ContextPointers->FltF9 = ContextRecord->FltF9; 00329 00330 // 00331 // Set floating point control register in trap frame. 00332 // Set the current software FPCR value in the TEB. 00333 // 00334 00335 TrapFrame->Fpcr = ContextRecord->Fpcr; 00336 try { 00337 NtCurrentTeb()->FpSoftwareStatusRegister = 00338 (ULONG)ContextRecord->SoftFpcr; 00339 00340 } except (EXCEPTION_EXECUTE_HANDLER) { 00341 NOTHING; 00342 } 00343 } 00344 00345 return; 00346 }

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