/*++ Copyright (c) 1990 Microsoft Corporation Module Name: kdcpuapi.c Abstract: This module implements CPU specific remote debug APIs. Author: Mark Lucovsky (markl) 04-Sep-1990 Revision History: 24-sep-90 bryanwi Port to the x86. --*/ #include #include "kdp.h" #define END_OF_CONTROL_SPACE (sizeof(KPROCESSOR_STATE)) extern ULONG KdpCurrentSymbolStart, KdpCurrentSymbolEnd; extern ULONG KdSpecialCalls[]; extern ULONG KdNumberOfSpecialCalls; LONG KdpLevelChange ( ULONG Pc, PCONTEXT ContextRecord, PBOOLEAN SpecialCall ); LONG regValue( UCHAR reg, PCONTEXT ContextRecord ); BOOLEAN KdpIsSpecialCall ( ULONG Pc, PCONTEXT ContextRecord, UCHAR opcode, UCHAR ModRM ); ULONG KdpGetReturnAddress ( PCONTEXT ContextRecord ); ULONG KdpGetCallNextOffset ( ULONG Pc, PCONTEXT ContextRecord ); #ifdef ALLOC_PRAGMA #pragma alloc_text(PAGEKD, KdpLevelChange) #pragma alloc_text(PAGEKD, regValue) #pragma alloc_text(PAGEKD, KdpIsSpecialCall) #pragma alloc_text(PAGEKD, KdpGetReturnAddress) #pragma alloc_text(PAGEKD, KdpSetLoadState) #pragma alloc_text(PAGEKD, KdpSetStateChange) #pragma alloc_text(PAGEKD, KdpGetStateChange) #pragma alloc_text(PAGEKD, KdpReadControlSpace) #pragma alloc_text(PAGEKD, KdpWriteControlSpace) #pragma alloc_text(PAGEKD, KdpReadIoSpace) #pragma alloc_text(PAGEKD, KdpWriteIoSpace) #pragma alloc_text(PAGEKD, KdpReadMachineSpecificRegister) #pragma alloc_text(PAGEKD, KdpWriteMachineSpecificRegister) #pragma alloc_text(PAGEKD, KdpGetCallNextOffset) #endif /**** KdpIsTryFinallyReturn - detect finally optimization * Input: * pc - program counter of instruction to check * ContextRecord - machine specific context * Output: * returns TRUE if this is a try-finally returning to the same * scope */ BOOLEAN KdpIsTryFinallyReturn ( ULONG Pc, PCONTEXT ContextRecord ) { ULONG retaddr; ULONG calldisp; UCHAR inst; // The complier generates code for a try-finally that involves having // a ret instruction that does not match with a call instruction. // This ret never returns a value (ie, it's a c3 return and not a // c2). It always returns into the current symbol scope. It is never // preceeded by a leave, which (hopefully) should differentiate it // from recursive returns. Check for this, and if we find it count // it as *0* level change. // As an optimization, the compiler will often change: // CALL // RET // into: // JMP // In either case, we figure out the return address. It's the first 4 bytes // on the stack. KdpMoveMemory( (PCHAR)&retaddr, (PCHAR)ContextRecord->Esp, 4 ); // DPRINT(( "Start %x return %x end %x\n", KdpCurrentSymbolStart, retaddr, KdpCurrentSymbolEnd )); if ( (KdpCurrentSymbolStart < retaddr) && (retaddr < KdpCurrentSymbolEnd) ) { // Well, things aren't this nice. We may have transferred but not yet // updated the start/end. This case occurs in a call to a thunk. We // look to see if the instruction before the return address is a call. // Gross and not 100% reliable. KdpMoveMemory( (PCHAR)&inst, (PCHAR)retaddr - 5, 1 ); KdpMoveMemory( (PCHAR)&calldisp, (PCHAR)retaddr - 4, 4 ); if (inst == 0xe8 && calldisp + retaddr == Pc) { // DPRINT(( "call to thunk @ %x\n", Pc )); return FALSE; } // returning to the current function. Either a finally // or a recursive return. Check for a leave. This is not 100% // reliable since we are betting on an instruction longer than a byte // and not ending with 0xc9. KdpMoveMemory( (PCHAR)&inst, (PCHAR)Pc-1, 1 ); if ( inst != 0xc9 ) { // not a leave. Assume a try-finally. // DPRINT(( "transfer at %x is try-finally\n", Pc )); return TRUE; } } // This appears to be a true RET instruction return FALSE; } /**** KdpLevelChange - say how the instruction affects the call level * Input: * pc - program counter of instruction to check * ContextRecord - machine specific context * SpecialCall - pointer to returned boolean indicating if the * instruction is a transfer to a special routine * Output: * returns -1 for a level pop, 1 for a push and 0 if it is * unchanged. * NOTE: This function belongs in some other file. I should move it. */ LONG KdpLevelChange ( ULONG Pc, PCONTEXT ContextRecord, PBOOLEAN SpecialCall ) { UCHAR membuf[2]; ULONG Addr; KdpMoveMemory( (PCHAR)membuf, (PCHAR)Pc, 2 ); switch (membuf[0]) { case 0xe8: // CALL direct w/32 bit displacement // For try/finally, the compiler may, in addition to the push/ret trick // below, use a call to the finally thunk. Since we treat a RET to // within the same symbol scope as not changing levels, we will also // treat such a call as not changing levels either KdpMoveMemory( (PCHAR)&Addr, (PCHAR)Pc+1, 4 ); Addr += Pc + 5; if ((KdpCurrentSymbolStart <= Addr) && (Addr < KdpCurrentSymbolEnd)) { *SpecialCall = FALSE; return 0; } case 0x9a: // CALL segmented 16:32 *SpecialCall = KdpIsSpecialCall( Pc, ContextRecord, membuf[0], membuf[1] ); return 1; case 0xff: // This is a compound instruction. Dispatch on operation switch (membuf[1] & 0x38) { case 0x10: // CALL with mod r/m *SpecialCall = KdpIsSpecialCall( Pc, ContextRecord, membuf[0], membuf[1] ); return 1; case 0x20: // JMP with mod r/m *SpecialCall = KdpIsSpecialCall( Pc, ContextRecord, membuf[0], membuf[1] ); // If this is a try/finally, we'd like to treat it as call since the // return inside the destination will bring us back to this context. // However, if it is a jmp to a special routine, we must treat it // as a no-level change operation since we won't see the special // routines's return. // If it is not a try/finally, we'd like to treat it as a no-level // change, unless again, it is a transfer to a special call which // views this as a level up. if (KdpIsTryFinallyReturn( Pc, ContextRecord )) { if (*SpecialCall) { // We won't see the return, so pretend it is just // inline code return 0; } else { // The destinations return will bring us back to this // context return 1; } } else if (*SpecialCall) { // We won't see the return but we are, indeed, doing one. return -1; } else { return 0; } default: *SpecialCall = FALSE; return 0; } case 0xc3: // RET // If we are a try/finally ret, then we indicate that it is NOT a level // change if (KdpIsTryFinallyReturn( Pc, ContextRecord )) { *SpecialCall = FALSE; return 0; } case 0xc2: // RET w/16 bit esp change case 0xca: // RETF w/16 bit esp change case 0xcb: // RETF *SpecialCall = FALSE; return -1; default: *SpecialCall = FALSE; return 0; } } // KdpLevelChange LONG regValue( UCHAR reg, PCONTEXT ContextRecord ) { switch (reg) { case 0x0: return(ContextRecord->Eax); break; case 0x1: return(ContextRecord->Ecx); break; case 0x2: return(ContextRecord->Edx); break; case 0x3: return(ContextRecord->Ebx); break; case 0x4: return(ContextRecord->Esp); break; case 0x5: return(ContextRecord->Ebp); break; case 0x6: return(ContextRecord->Esi); break; case 0x7: return(ContextRecord->Edi); break; } return 0; // Bash compiler warning } BOOLEAN KdpIsSpecialCall ( ULONG Pc, PCONTEXT ContextRecord, UCHAR opcode, UCHAR modRM ) /*++ Routine Description: Check to see if the instruction at pc is a call to one of the SpecialCall routines. Argument: Pc - program counter of instruction in question. --*/ { UCHAR sib; USHORT twoBytes; ULONG callAddr; ULONG addrAddr; LONG offset; ULONG i; char d8; if ( opcode == 0xe8 ) { // Signed offset from pc KdpMoveMemory( (PCHAR)&offset, (PCHAR)Pc+1, 4 ); callAddr = Pc + offset + 5; // +5 for instr len. } else if ( opcode == 0xff ) { if ( ((modRM & 0x38) != 0x10) && ((modRM & 0x38) != 0x20) ) { // not call or jump return FALSE; } if ( (modRM & 0x08) == 0x08 ) { // m16:16 or m16:32 -- we don't handle this return FALSE; } if ( (modRM & 0xc0) == 0xc0 ) { /* Direct register addressing */ callAddr = regValue( (UCHAR)(modRM&0x7), ContextRecord ); } else if ( (modRM & 0xc7) == 0x05 ) { // Calls across dll boundaries involve a call into a jump table, // wherein the jump address is set to the real called routine at DLL // load time. Check to see if we're calling such an instruction, // and if so, compute its target address and set callAddr there. // ff15 or ff25 -- call or jump indirect with disp32. Get // address of address KdpMoveMemory( (PCHAR)&addrAddr, (PCHAR)Pc+2, 4 ); // Get real destination address KdpMoveMemory( (PCHAR)&callAddr, (PCHAR)addrAddr, 4 ); // DPRINT(( "Indirect call/jmp @ %x\n", Pc )); } else if ( (modRM & 0x7) == 0x4 ) { LONG indexValue; /* sib byte present */ KdpMoveMemory( (PCHAR)&sib, (PCHAR)Pc+2, 1 ); indexValue = regValue( (UCHAR)((sib & 0x31) >> 3), ContextRecord ); switch ( sib&0xc0 ) { case 0x0: /* x1 */ break; case 0x40: indexValue *= 2; break; case 0x80: indexValue *= 4; break; case 0xc0: indexValue *= 8; break; } /* switch */ switch ( modRM & 0xc0 ) { case 0x0: /* no displacement */ if ( (sib & 0x7) == 0x5 ) { // DPRINT(("funny call #1 at %x\n", Pc)); return FALSE; } callAddr = indexValue + regValue((UCHAR)(sib&0x7), ContextRecord ); break; case 0x40: if ( (sib & 0x6) == 0x4 ) { // DPRINT(("Funny call #2\n")); /* calling into the stack */ return FALSE; } KdpMoveMemory( &d8, (PCHAR)Pc+3,1 ); callAddr = indexValue + d8 + regValue((UCHAR)(sib&0x7), ContextRecord ); break; case 0x80: if ( (sib & 0x6) == 0x4 ) { // DPRINT(("Funny call #3\n")); /* calling into the stack */ return FALSE; } KdpMoveMemory( (PCHAR)&offset, (PCHAR)Pc+3, 4 ); callAddr = indexValue + offset + regValue((UCHAR)(sib&0x7), ContextRecord ); break; case 0xc0: ASSERT( FALSE ); break; } } else { //KdPrint(( "undecoded call at %x\n", // CONTEXT_TO_PROGRAM_COUNTER(ContextRecord) )); return FALSE; } } else if ( opcode == 0x9a ) { /* Absolute address call (best I can tell, cc doesn't generate this) */ KdpMoveMemory( (PCHAR)&callAddr, (PCHAR)Pc+1, 4 ); } else { return FALSE; } // Calls across dll boundaries involve a call into a jump table, // wherein the jump address is set to the real called routine at DLL // load time. Check to see if we're calling such an instruction, // and if so, compute its target address and set callAddr there. #if 0 KdpMoveMemory( (PCHAR)&twoBytes, (PCHAR)callAddr, 2 ); if ( twoBytes == 0x25ff ) { /* i386 is little-Endian; really 0xff25 */ // This is a 'jmp dword ptr [mem]' instruction, which is the sort of // jump used for a dll-boundary crossing call. Fixup callAddr. KdpMoveMemory( (PCHAR)&addrAddr, (PCHAR)callAddr+2, 4 ); KdpMoveMemory( (PCHAR)&callAddr, (PCHAR)addrAddr, 4 ); } #endif for ( i = 0; i < KdNumberOfSpecialCalls; i++ ) { if ( KdSpecialCalls[i] == callAddr ) { return TRUE; } } return FALSE; } /* * Find the return address of the current function. Only works when * locals haven't yet been pushed (ie, on the first instruction of the * function). */ ULONG KdpGetReturnAddress ( PCONTEXT ContextRecord ) { ULONG retaddr; KdpMoveMemory((PCHAR)(&retaddr), (PCHAR)(ContextRecord->Esp), 4 ); return retaddr; } // KdpGetReturnAddress VOID KdpSetLoadState( IN PDBGKD_WAIT_STATE_CHANGE WaitStateChange, IN PCONTEXT ContextRecord ) /*++ Routine Description: Fill in the Wait_State_Change message record for the load symbol case. Arguments: WaitStateChange - Supplies pointer to record to fill in ContextRecord - Supplies a pointer to a context record. Return Value: None. --*/ { ULONG Count; PVOID End; PKPRCB Prcb; // Store the special x86 register into the control report structure. Prcb = KeGetCurrentPrcb(); WaitStateChange->ControlReport.Dr6 = Prcb->ProcessorState.SpecialRegisters.KernelDr6; WaitStateChange->ControlReport.Dr7 = Prcb->ProcessorState.SpecialRegisters.KernelDr7; // Copy the immediate instruction stream into the control report structure. Count = KdpMoveMemory((PCHAR)(&(WaitStateChange->ControlReport.InstructionStream[0])), (PCHAR)(WaitStateChange->ProgramCounter), DBGKD_MAXSTREAM); WaitStateChange->ControlReport.InstructionCount = (USHORT)Count; // Clear breakpoints in the copied instruction stream. If any breakpoints // are cleared, then recopy the instruction stream. End = (PVOID)((PUCHAR)(WaitStateChange->ProgramCounter) + Count - 1); if (KdpDeleteBreakpointRange(WaitStateChange->ProgramCounter, End) != FALSE) { KdpMoveMemory(&(WaitStateChange->ControlReport.InstructionStream[0]), WaitStateChange->ProgramCounter, Count); } // Store the segment registers into the control report structure and set the // control flags. WaitStateChange->ControlReport.SegCs = (USHORT)(ContextRecord->SegCs); WaitStateChange->ControlReport.SegDs = (USHORT)(ContextRecord->SegDs); WaitStateChange->ControlReport.SegEs = (USHORT)(ContextRecord->SegEs); WaitStateChange->ControlReport.SegFs = (USHORT)(ContextRecord->SegFs); WaitStateChange->ControlReport.EFlags = ContextRecord->EFlags; WaitStateChange->ControlReport.ReportFlags = REPORT_INCLUDES_SEGS; // Copy context record into wait state change structure. KdpMoveMemory((PCHAR)(&WaitStateChange->Context), (PCHAR)ContextRecord, sizeof(CONTEXT)); return; } VOID KdpSetStateChange( IN PDBGKD_WAIT_STATE_CHANGE WaitStateChange, IN PEXCEPTION_RECORD ExceptionRecord, IN PCONTEXT ContextRecord, IN BOOLEAN SecondChance ) /*++ Routine Description: Fill in the Wait_State_Change message record. Arguments: WaitStateChange - Supplies pointer to record to fill in ExceptionRecord - Supplies a pointer to an exception record. ContextRecord - Supplies a pointer to a context record. SecondChance - Supplies a boolean value that determines whether this is the first or second chance for the exception. Return Value: None. --*/ { PKPRCB Prcb; BOOLEAN status; // Set up description of event, including exception record WaitStateChange->NewState = DbgKdExceptionStateChange; WaitStateChange->ProcessorLevel = KeProcessorLevel; WaitStateChange->Processor = (USHORT)KeGetCurrentPrcb()->Number; WaitStateChange->NumberProcessors = (ULONG)KeNumberProcessors; WaitStateChange->Thread = (PVOID)KeGetCurrentThread(); WaitStateChange->ProgramCounter = (PVOID)CONTEXT_TO_PROGRAM_COUNTER(ContextRecord); KdpQuickMoveMemory( (PCHAR)&WaitStateChange->u.Exception.ExceptionRecord, (PCHAR)ExceptionRecord, sizeof(EXCEPTION_RECORD) ); WaitStateChange->u.Exception.FirstChance = !SecondChance; // Copy instruction stream immediately following location of event WaitStateChange->ControlReport.InstructionCount = (USHORT)KdpMoveMemory( (PCHAR)(&(WaitStateChange->ControlReport.InstructionStream[0])), (PCHAR)(WaitStateChange->ProgramCounter), DBGKD_MAXSTREAM ); // Copy context record immediately following instruction stream KdpMoveMemory( (PCHAR)(&WaitStateChange->Context), (PCHAR)ContextRecord, sizeof(*ContextRecord) ); // Clear breakpoints in copied area status = KdpDeleteBreakpointRange( WaitStateChange->ProgramCounter, (PVOID)((PUCHAR)WaitStateChange->ProgramCounter + WaitStateChange->ControlReport.InstructionCount - 1) ); // If there were any breakpoints cleared, recopy the area without them if (status == TRUE) { KdpMoveMemory( &(WaitStateChange->ControlReport.InstructionStream[0]), WaitStateChange->ProgramCounter, WaitStateChange->ControlReport.InstructionCount ); } // Special registers for the x86 Prcb = KeGetCurrentPrcb(); WaitStateChange->ControlReport.Dr6 = Prcb->ProcessorState.SpecialRegisters.KernelDr6; WaitStateChange->ControlReport.Dr7 = Prcb->ProcessorState.SpecialRegisters.KernelDr7; WaitStateChange->ControlReport.SegCs = (USHORT)(ContextRecord->SegCs); WaitStateChange->ControlReport.SegDs = (USHORT)(ContextRecord->SegDs); WaitStateChange->ControlReport.SegEs = (USHORT)(ContextRecord->SegEs); WaitStateChange->ControlReport.SegFs = (USHORT)(ContextRecord->SegFs); WaitStateChange->ControlReport.EFlags = ContextRecord->EFlags; WaitStateChange->ControlReport.ReportFlags = REPORT_INCLUDES_SEGS; } VOID KdpGetStateChange( IN PDBGKD_MANIPULATE_STATE ManipulateState, IN PCONTEXT ContextRecord ) /*++ Routine Description: Extract continuation control data from Manipulate_State message Arguments: ManipulateState - supplies pointer to Manipulate_State packet ContextRecord - Supplies a pointer to a context record. Return Value: None. --*/ { PKPRCB Prcb; ULONG Processor; if (NT_SUCCESS(ManipulateState->u.Continue2.ContinueStatus) == TRUE) { // If NT_SUCCESS returns TRUE, then the debugger is doing a // continue, and it makes sense to apply control changes. // Otherwise the debugger is saying that it doesn't know what // to do with this exception, so control values are ignored. if (ManipulateState->u.Continue2.ControlSet.TraceFlag == TRUE) { ContextRecord->EFlags |= 0x100L; } else { ContextRecord->EFlags &= ~0x100L; } for (Processor = 0; Processor < (ULONG)KeNumberProcessors; Processor++) { Prcb = KiProcessorBlock[Processor]; Prcb->ProcessorState.SpecialRegisters.KernelDr7 = ManipulateState->u.Continue2.ControlSet.Dr7; Prcb->ProcessorState.SpecialRegisters.KernelDr6 = 0L; } if (ManipulateState->u.Continue2.ControlSet.CurrentSymbolStart != 1) { KdpCurrentSymbolStart = ManipulateState->u.Continue2.ControlSet.CurrentSymbolStart; KdpCurrentSymbolEnd = ManipulateState->u.Continue2.ControlSet.CurrentSymbolEnd; } } } VOID KdpReadControlSpace( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a read control space state manipulation message. Its function is to read implementation specific system data. IMPLEMENTATION NOTE: On the X86, control space is defined as follows: 0: Base of KPROCESSOR_STATE structure. (KPRCB.ProcessorState) This includes CONTEXT record, followed by a SPECIAL_REGISTERs record Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_READ_MEMORY a = &m->u.ReadMemory; STRING MessageHeader; ULONG Length, t; PVOID StartAddr; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; ASSERT(AdditionalData->Length == 0); if (a->TransferCount > (PACKET_MAX_SIZE - sizeof(DBGKD_MANIPULATE_STATE))) { Length = PACKET_MAX_SIZE - sizeof(DBGKD_MANIPULATE_STATE); } else { Length = a->TransferCount; } if ((a->TargetBaseAddress < (PVOID)END_OF_CONTROL_SPACE) && (m->Processor < (USHORT)KeNumberProcessors)) { t = (ULONG)END_OF_CONTROL_SPACE - (ULONG)(a->TargetBaseAddress); if (t < Length) { Length = t; } StartAddr = (PVOID)((ULONG)a->TargetBaseAddress + (ULONG)&(KiProcessorBlock[m->Processor]->ProcessorState)); AdditionalData->Length = (USHORT)KdpMoveMemory( AdditionalData->Buffer, StartAddr, Length ); if (Length == AdditionalData->Length) { m->ReturnStatus = STATUS_SUCCESS; } else { m->ReturnStatus = STATUS_UNSUCCESSFUL; } a->ActualBytesRead = AdditionalData->Length; } else { AdditionalData->Length = 0; m->ReturnStatus = STATUS_UNSUCCESSFUL; a->ActualBytesRead = 0; } KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, AdditionalData ); UNREFERENCED_PARAMETER(Context); } VOID KdpWriteControlSpace( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a write control space state manipulation message. Its function is to write implementation specific system data. Control space for x86 is as defined above. Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_WRITE_MEMORY a = &m->u.WriteMemory; ULONG Length; STRING MessageHeader; PVOID StartAddr; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; if ((((PUCHAR)a->TargetBaseAddress + a->TransferCount) <= (PUCHAR)END_OF_CONTROL_SPACE) && (m->Processor < (USHORT)KeNumberProcessors)) { StartAddr = (PVOID)((ULONG)a->TargetBaseAddress + (ULONG)&(KiProcessorBlock[m->Processor]->ProcessorState)); Length = KdpMoveMemory( StartAddr, AdditionalData->Buffer, AdditionalData->Length ); if (Length == AdditionalData->Length) { m->ReturnStatus = STATUS_SUCCESS; } else { m->ReturnStatus = STATUS_UNSUCCESSFUL; } a->ActualBytesWritten = Length; } else { AdditionalData->Length = 0; m->ReturnStatus = STATUS_UNSUCCESSFUL; a->ActualBytesWritten = 0; } KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, AdditionalData ); UNREFERENCED_PARAMETER(Context); } VOID KdpReadIoSpace( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a read io space state manipulation message. Its function is to read system io locations. Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_READ_WRITE_IO a = &m->u.ReadWriteIo; STRING MessageHeader; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; ASSERT(AdditionalData->Length == 0); m->ReturnStatus = STATUS_SUCCESS; // Check Size and Alignment switch ( a->DataSize ) { case 1: a->DataValue = (ULONG)READ_PORT_UCHAR(a->IoAddress); break; case 2: if ((ULONG)a->IoAddress & 1 ) { m->ReturnStatus = STATUS_DATATYPE_MISALIGNMENT; } else { a->DataValue = (ULONG)READ_PORT_USHORT(a->IoAddress); } break; case 4: if ((ULONG)a->IoAddress & 3 ) { m->ReturnStatus = STATUS_DATATYPE_MISALIGNMENT; } else { a->DataValue = READ_PORT_ULONG(a->IoAddress); } break; default: m->ReturnStatus = STATUS_INVALID_PARAMETER; } KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, NULL ); UNREFERENCED_PARAMETER(Context); } VOID KdpWriteIoSpace( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a write io space state manipulation message. Its function is to write to system io locations. Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_READ_WRITE_IO a = &m->u.ReadWriteIo; STRING MessageHeader; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; ASSERT(AdditionalData->Length == 0); m->ReturnStatus = STATUS_SUCCESS; // Check Size and Alignment switch ( a->DataSize ) { case 1: WRITE_PORT_UCHAR(a->IoAddress, (UCHAR)a->DataValue); break; case 2: if ((ULONG)a->IoAddress & 1 ) { m->ReturnStatus = STATUS_DATATYPE_MISALIGNMENT; } else { WRITE_PORT_USHORT(a->IoAddress, (USHORT)a->DataValue); } break; case 4: if ((ULONG)a->IoAddress & 3 ) { m->ReturnStatus = STATUS_DATATYPE_MISALIGNMENT; } else { WRITE_PORT_ULONG(a->IoAddress, a->DataValue); } break; default: m->ReturnStatus = STATUS_INVALID_PARAMETER; } KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, NULL ); UNREFERENCED_PARAMETER(Context); } VOID KdpReadMachineSpecificRegister( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a read MSR manipulation message. Its function is to read the MSR. Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_READ_WRITE_MSR a = &m->u.ReadWriteMsr; STRING MessageHeader; LARGE_INTEGER l; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; ASSERT(AdditionalData->Length == 0); m->ReturnStatus = STATUS_SUCCESS; try { l.QuadPart = RDMSR(a->Msr); } except (EXCEPTION_EXECUTE_HANDLER) { l.QuadPart = 0; m->ReturnStatus = STATUS_NO_SUCH_DEVICE; } a->DataValueLow = l.LowPart; a->DataValueHigh = l.HighPart; KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, NULL ); UNREFERENCED_PARAMETER(Context); } VOID KdpWriteMachineSpecificRegister( IN PDBGKD_MANIPULATE_STATE m, IN PSTRING AdditionalData, IN PCONTEXT Context ) /*++ Routine Description: This function is called in response of a write of a MSR manipulation message. Its function is to write to the MSR Arguments: m - Supplies the state manipulation message. AdditionalData - Supplies any additional data for the message. Context - Supplies the current context. Return Value: None. --*/ { PDBGKD_READ_WRITE_MSR a = &m->u.ReadWriteMsr; STRING MessageHeader; LARGE_INTEGER l; MessageHeader.Length = sizeof(*m); MessageHeader.Buffer = (PCHAR)m; ASSERT(AdditionalData->Length == 0); m->ReturnStatus = STATUS_SUCCESS; l.HighPart = a->DataValueHigh; l.LowPart = a->DataValueLow; try { WRMSR (a->Msr, l.QuadPart); } except (EXCEPTION_EXECUTE_HANDLER) { m->ReturnStatus = STATUS_NO_SUCH_DEVICE; } KdpSendPacket( PACKET_TYPE_KD_STATE_MANIPULATE, &MessageHeader, NULL ); UNREFERENCED_PARAMETER(Context); } /*** KdpGetCallNextOffset - compute "next" instruction on a call-like instruction * Purpose: * Compute how many bytes are in a call-type instruction * so that a breakpoint can be set upon this instruction's * return. Treat indirect jmps as if they were call/ret/ret * Returns: * offset to "next" instruction, or 0 if it wasn't a call instruction. */ ULONG KdpGetCallNextOffset ( ULONG Pc, PCONTEXT ContextRecord ) { UCHAR membuf[2]; UCHAR opcode; ULONG sib; ULONG disp; KdpMoveMemory( membuf, (PVOID)Pc, 2 ); opcode = membuf[0]; if ( opcode == 0xe8 ) { // CALL 32 bit disp return Pc+5; } else if ( opcode == 0x9a ) { // CALL 16:32 return Pc+7; } else if ( opcode == 0xff ) { if ( membuf[1] == 0x25) { // JMP indirect return KdpGetReturnAddress( ContextRecord ); } sib = ((membuf[1] & 0x07) == 0x04) ? 1 : 0; disp = (membuf[1] & 0xc0) >> 6; switch (disp) { case 0: if ( (membuf[1] & 0x07) == 0x05 ) { disp = 4; // disp32 alone } else { // disp = 0; // no displacement with reg or sib } break; case 1: // disp = 1; // disp8 with reg or sib break; case 2: disp = 4; // disp32 with reg or sib break; case 3: disp = 0; // direct register addressing (e.g., call esi) break; } return Pc + 2 + sib + disp; } return 0; } // KdpGetCallNextOffset