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250 lines
7.9 KiB
250 lines
7.9 KiB
/*-----------------------------------------------------------------------------
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Copyright (c) 2000 Microsoft Corporation
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Module:
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exts.cpp
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Sampe file showing couple of extension examples
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-----------------------------------------------------------------------------*/
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#include "dbgexts.h"
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/*
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Sample extension to demonstrace ececuting debugger command
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*/
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HRESULT CALLBACK
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cmdsample(PDEBUG_CLIENT Client, PCSTR args)
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{
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CHAR Input[256];
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INIT_API();
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//
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// Output a 10 frame stack
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//
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g_ExtControl->OutputStackTrace(DEBUG_OUTCTL_ALL_CLIENTS | // Flags on what to do with output
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DEBUG_OUTCTL_OVERRIDE_MASK |
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DEBUG_OUTCTL_NOT_LOGGED,
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NULL,
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10, // number of frames to display
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DEBUG_STACK_FUNCTION_INFO | DEBUG_STACK_COLUMN_NAMES |
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DEBUG_STACK_ARGUMENTS | DEBUG_STACK_FRAME_ADDRESSES);
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//
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// Engine interface for print
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//
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g_ExtControl->Output(DEBUG_OUTCTL_ALL_CLIENTS, "\n\nDebugger module list\n");
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//
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// list all the modules by executing lm command
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//
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g_ExtControl->Execute(DEBUG_OUTCTL_ALL_CLIENTS |
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DEBUG_OUTCTL_OVERRIDE_MASK |
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DEBUG_OUTCTL_NOT_LOGGED,
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"lm", // Command to be executed
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DEBUG_EXECUTE_DEFAULT );
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//
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// Ask for user input
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//
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g_ExtControl->Output(DEBUG_OUTCTL_ALL_CLIENTS, "\n\n***User Input sample\n\nEnter Command to run : ");
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GetInputLine(NULL, &Input[0], sizeof(Input));
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g_ExtControl->Execute(DEBUG_OUTCTL_ALL_CLIENTS |
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DEBUG_OUTCTL_OVERRIDE_MASK |
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DEBUG_OUTCTL_NOT_LOGGED,
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Input, // Command to be executed
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DEBUG_EXECUTE_DEFAULT );
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EXIT_API();
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return S_OK;
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}
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/*
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Sample extension to read and dump a struct on target
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This reads the struct _EXCEPTION_RECORD which is defined as:
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typedef struct _EXCEPTION_RECORD {
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NTSTATUS ExceptionCode;
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ULONG ExceptionFlags;
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struct _EXCEPTION_RECORD *ExceptionRecord;
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PVOID ExceptionAddress;
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ULONG NumberParameters;
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ULONG_PTR ExceptionInformation[EXCEPTION_MAXIMUM_PARAMETERS];
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} EXCEPTION_RECORD;
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*/
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HRESULT CALLBACK
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structsample(PDEBUG_CLIENT Client, PCSTR args)
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{
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ULONG64 Address;
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INIT_API();
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Address = GetExpression(args);
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DWORD Buffer[4], cb;
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// Read and display first 4 dwords at Address
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if (ReadMemory(Address, &Buffer, sizeof(Buffer), &cb) && cb == sizeof(Buffer)) {
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dprintf("%p: %08lx %08lx %08lx %08lx\n\n", Address,
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Buffer[0], Buffer[1], Buffer[2], Buffer[3]);
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}
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//
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// Method 1 to dump a struct
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//
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dprintf("Method 1:\n");
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// Inititalze type read from the Address
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if (InitTypeRead(Address, _EXCEPTION_RECORD) != 0) {
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dprintf("Error in reading _EXCEPTION_RECORD at %p", // Use %p to print pointer values
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Address);
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} else {
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// read and dump the fields
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dprintf("_EXCEPTION_RECORD @ %p\n", Address);
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dprintf("\tExceptionCode : %lx\n", (ULONG) ReadField(ExceptionCode));
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dprintf("\tExceptionAddress : %p\n", ReadField(ExceptionAddress));
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dprintf("\tExceptionInformation[1] : %I64lx\n", ReadField(ExceptionInformation[1]));
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// And so on...
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}
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//
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// Method 2 to read a struct
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//
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ULONG64 ExceptionInformation_1, ExceptionAddress, ExceptionCode;
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dprintf("\n\nMethod 2:\n");
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// Read and dump the fields by specifying type and address individually
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if (GetFieldValue(Address, "_EXCEPTION_RECORD", "ExceptionCode", ExceptionCode)) {
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dprintf("Error in reading _EXCEPTION_RECORD at %p\n",
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Address);
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} else {
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// Pointers are read as ULONG64 values
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GetFieldValue(Address, "_EXCEPTION_RECORD", "ExceptionAddress", ExceptionAddress);
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GetFieldValue(Address, "_EXCEPTION_RECORD", "ExceptionInformation[1]", ExceptionInformation_1);
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// And so on..
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dprintf("_EXCEPTION_RECORD @ %p\n", Address);
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dprintf("\tExceptionCode : %lx\n", ExceptionCode);
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dprintf("\tExceptionAddress : %p\n", ExceptionAddress);
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dprintf("\tExceptionInformation[1] : %I64lx\n", ExceptionInformation_1);
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}
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ULONG64 Module;
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ULONG i, TypeId;
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CHAR Name[MAX_PATH];
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//
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// To get/list field names
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//
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g_ExtSymbols->GetSymbolTypeId("_EXCEPTION_RECORD", &TypeId, &Module);
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dprintf("Fields of _EXCEPTION_RECORD\n");
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for (i=0; ;i++) {
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HRESULT Hr;
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ULONG Offset=0;
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Hr = g_ExtSymbols2->GetFieldName(Module, TypeId, i, Name, MAX_PATH, NULL);
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if (Hr == S_OK) {
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g_ExtSymbols->GetFieldOffset(Module, TypeId, Name, &Offset);
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dprintf("%lx (+%03lx) %s\n", i, Offset, Name);
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} else if (Hr == E_INVALIDARG) {
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// All Fields done
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break;
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} else {
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dprintf("GetFieldName Failed %lx\n", Hr);
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break;
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}
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}
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//
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// Get name for an enumerate
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//
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// typedef enum {
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// Enum1,
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// Enum2,
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// Enum3,
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// } TEST_ENUM;
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//
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ULONG ValueOfEnum = 0;
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g_ExtSymbols->GetSymbolTypeId("TEST_ENUM", &TypeId, &Module);
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g_ExtSymbols2->GetConstantName(Module, TypeId, ValueOfEnum, Name, MAX_PATH, NULL);
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dprintf("Testenum %I64lx == %s\n", ExceptionCode, Name);
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// This prints out, Testenum 0 == Enum1
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//
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// Read an array
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//
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// typedef struct FOO_TYPE {
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// ULONG Bar;
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// ULONG Bar2;
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// } FOO_TYPE;
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//
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// FOO_TYPE sampleArray[20];
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ULONG Bar, Bar2;
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CHAR TypeName[100];
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for (i=0; i<20; i++) {
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sprintf(TypeName, "sampleArray[%lx]", i);
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if (GetFieldValue(0, TypeName, "Bar", Bar))
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break;
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GetFieldValue(0, TypeName, "Bar2", Bar2);
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dprintf("%16s - Bar %2ld Bar2 %ld\n", TypeName, Bar, Bar2);
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}
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EXIT_API();
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return S_OK;
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}
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/*
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This gets called (by DebugExtensionNotify whentarget is halted and is accessible
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*/
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HRESULT
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NotifyOnTargetAccessible(PDEBUG_CONTROL Control)
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{
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dprintf("Extension dll detected a break");
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if (Connected) {
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dprintf(" connected to ");
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switch (TargetMachine) {
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case IMAGE_FILE_MACHINE_I386:
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dprintf("X86");
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break;
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case IMAGE_FILE_MACHINE_AMD64:
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dprintf("AMD64");
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break;
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case IMAGE_FILE_MACHINE_IA64:
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dprintf("IA64");
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break;
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default:
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dprintf("Other");
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break;
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}
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}
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dprintf("\n");
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//
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// show the top frame and execute dv to dump the locals here and return
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//
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Control->Execute(DEBUG_OUTCTL_ALL_CLIENTS |
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DEBUG_OUTCTL_OVERRIDE_MASK |
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DEBUG_OUTCTL_NOT_LOGGED,
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".frame", // Command to be executed
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DEBUG_EXECUTE_DEFAULT );
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Control->Execute(DEBUG_OUTCTL_ALL_CLIENTS |
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DEBUG_OUTCTL_OVERRIDE_MASK |
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DEBUG_OUTCTL_NOT_LOGGED,
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"dv", // Command to be executed
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DEBUG_EXECUTE_DEFAULT );
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return S_OK;
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}
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/*
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A built-in help for the extension dll
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*/
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HRESULT CALLBACK
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help(PDEBUG_CLIENT Client, PCSTR args)
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{
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INIT_API();
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dprintf("Help for dbgexts.dll\n"
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" cmdsample - This does stacktrace and lists\n"
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" help = Shows this help\n"
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" structsample <addr> - This dumps a struct at given address\n"
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);
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EXIT_API();
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return S_OK;
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}
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