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reactos/drivers/base/kdgdb/gdb_input.c
Jérôme Gardou 6e0d8de013 [KDGDB] Support "int 0x2c" for x86 & amd64 targets
2021-07-05 10:55:47 +02:00

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/*
* COPYRIGHT: GPL, see COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/base/kddll/gdb_input.c
* PURPOSE: Base functions for the kernel debugger.
*/
#include "kdgdb.h"
/* LOCALS *********************************************************************/
static ULONG_PTR gdb_run_tid;
static struct
{
ULONG_PTR Address;
ULONG Handle;
} BreakPointHandles[32];
/* GLOBALS ********************************************************************/
UINT_PTR gdb_dbg_pid;
UINT_PTR gdb_dbg_tid;
static inline
KDSTATUS
LOOP_IF_SUCCESS(int x)
{
return (x == KdPacketReceived) ? (KDSTATUS)-1 : x;
}
/* PRIVATE FUNCTIONS **********************************************************/
static
UINT_PTR
hex_to_tid(char* buffer)
{
ULONG_PTR ret = 0;
char hex;
while (*buffer)
{
hex = hex_value(*buffer++);
if (hex < 0)
return ret;
ret <<= 4;
ret += hex;
}
return ret;
}
#define hex_to_pid hex_to_tid
static
ULONG64
hex_to_address(char* buffer)
{
ULONG64 ret = 0;
char hex;
while (*buffer)
{
hex = hex_value(*buffer++);
if (hex < 0)
return ret;
ret <<= 4;
ret += hex;
}
return ret;
}
/* H* packets */
static
KDSTATUS
handle_gdb_set_thread(void)
{
KDSTATUS Status;
switch (gdb_input[1])
{
case 'c':
if (strcmp(&gdb_input[2], "-1") == 0)
gdb_run_tid = (ULONG_PTR)-1;
else
gdb_run_tid = hex_to_tid(&gdb_input[2]);
Status = send_gdb_packet("OK");
break;
case 'g':
KDDBGPRINT("Setting debug thread: %s.\n", gdb_input);
#if MONOPROCESS
gdb_dbg_pid = 0;
if (strncmp(&gdb_input[2], "-1", 2) == 0)
{
gdb_dbg_tid = (UINT_PTR)-1;
}
else
{
gdb_dbg_tid = hex_to_tid(&gdb_input[2]);
}
#else
if (strncmp(&gdb_input[2], "p-1", 3) == 0)
{
gdb_dbg_pid = (UINT_PTR)-1;
gdb_dbg_tid = (UINT_PTR)-1;
}
else
{
char* ptr = strstr(gdb_input, ".") + 1;
gdb_dbg_pid = hex_to_pid(&gdb_input[3]);
if (strncmp(ptr, "-1", 2) == 0)
gdb_dbg_tid = (UINT_PTR)-1;
else
gdb_dbg_tid = hex_to_tid(ptr);
}
#endif
Status = send_gdb_packet("OK");
break;
default:
KDDBGPRINT("KDGBD: Unknown 'H' command: %s\n", gdb_input);
Status = send_gdb_packet("");
}
return Status;
}
static
KDSTATUS
handle_gdb_thread_alive(void)
{
ULONG_PTR Pid, Tid;
PETHREAD Thread;
KDSTATUS Status;
#if MONOPROCESS
Pid = 0;
Tid = hex_to_tid(&gdb_input[1]);
KDDBGPRINT("Checking if %p is alive.\n", Tid);
#else
Pid = hex_to_pid(&gdb_input[2]);
Tid = hex_to_tid(strstr(gdb_input, ".") + 1);
/* We cannot use PsLookupProcessThreadByCid as we could be running at any IRQL.
* So loop. */
KDDBGPRINT("Checking if p%p.%p is alive.\n", Pid, Tid);
#endif
Thread = find_thread(Pid, Tid);
if (Thread != NULL)
Status = send_gdb_packet("OK");
else
Status = send_gdb_packet("E03");
return Status;
}
/* q* packets */
static
KDSTATUS
handle_gdb_query(void)
{
if (strncmp(gdb_input, "qSupported:", 11) == 0)
{
#if MONOPROCESS
return send_gdb_packet("PacketSize=1000;qXfer:libraries:read+;");
#else
return send_gdb_packet("PacketSize=1000;multiprocess+;qXfer:libraries:read+;");
#endif
}
if (strncmp(gdb_input, "qAttached", 9) == 0)
{
#if MONOPROCESS
return send_gdb_packet("1");
#else
UINT_PTR queried_pid = hex_to_pid(&gdb_input[10]);
/* Let's say we created system process */
if (gdb_pid_to_handle(queried_pid) == NULL)
return send_gdb_packet("0");
else
return send_gdb_packet("1");
#endif
}
if (strncmp(gdb_input, "qRcmd,", 6) == 0)
{
return send_gdb_packet("OK");
}
if (strcmp(gdb_input, "qC") == 0)
{
char gdb_out[64];
#if MONOPROCESS
sprintf(gdb_out, "QC:%"PRIxPTR";",
handle_to_gdb_tid(PsGetThreadId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread)));
#else
sprintf(gdb_out, "QC:p%"PRIxPTR".%"PRIxPTR";",
handle_to_gdb_pid(PsGetThreadProcessId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread)),
handle_to_gdb_tid(PsGetThreadId((PETHREAD)(ULONG_PTR)CurrentStateChange.Thread)));
#endif
return send_gdb_packet(gdb_out);
}
if (strncmp(gdb_input, "qfThreadInfo", 12) == 0)
{
PEPROCESS Process;
char gdb_out[40];
LIST_ENTRY* CurrentProcessEntry;
CurrentProcessEntry = ProcessListHead->Flink;
if (CurrentProcessEntry == NULL) /* Ps is not initialized */
{
#if MONOPROCESS
return send_gdb_packet("m1");
#else
return send_gdb_packet("mp1.1");
#endif
}
/* We will push threads as we find them */
start_gdb_packet();
/* Start with the system thread */
#if MONOPROCESS
send_gdb_partial_packet("m1");
#else
send_gdb_partial_packet("mp1.1");
#endif
/* List all the processes */
for ( ;
CurrentProcessEntry != ProcessListHead;
CurrentProcessEntry = CurrentProcessEntry->Flink)
{
LIST_ENTRY* CurrentThreadEntry;
Process = CONTAINING_RECORD(CurrentProcessEntry, EPROCESS, ActiveProcessLinks);
/* List threads from this process */
for ( CurrentThreadEntry = Process->ThreadListHead.Flink;
CurrentThreadEntry != &Process->ThreadListHead;
CurrentThreadEntry = CurrentThreadEntry->Flink)
{
PETHREAD Thread = CONTAINING_RECORD(CurrentThreadEntry, ETHREAD, ThreadListEntry);
#if MONOPROCESS
_snprintf(gdb_out, 40, ",%p", handle_to_gdb_tid(Thread->Cid.UniqueThread));
#else
_snprintf(gdb_out, 40, ",p%p.%p",
handle_to_gdb_pid(Process->UniqueProcessId),
handle_to_gdb_tid(Thread->Cid.UniqueThread));
#endif
send_gdb_partial_packet(gdb_out);
}
}
return finish_gdb_packet();
}
if (strncmp(gdb_input, "qsThreadInfo", 12) == 0)
{
/* We sent the whole thread list on first qfThreadInfo call */
return send_gdb_packet("l");
}
if (strncmp(gdb_input, "qGetTIBAddr:", 12) == 0)
{
ULONG_PTR Pid, Tid;
PETHREAD Thread;
#if MONOPROCESS
Pid = 0;
Tid = hex_to_tid(&gdb_input[12]);
KDDBGPRINT(" %p.\n", Tid);
Thread = find_thread(Pid, Tid);
#else
Pid = hex_to_pid(&gdb_input[13]);
Tid = hex_to_tid(strstr(&gdb_input[13], ".") + 1);
/* We cannot use PsLookupProcessThreadByCid as we could be running at any IRQL.
* So loop. */
KDDBGPRINT(" p%p.%p.\n", Pid, Tid);
Thread = find_thread(Pid, Tid);
#endif
return send_gdb_memory(&Thread->Tcb.Teb, sizeof(Thread->Tcb.Teb));
}
if (strncmp(gdb_input, "qThreadExtraInfo,", 17) == 0)
{
ULONG_PTR Pid, Tid;
PETHREAD Thread;
PEPROCESS Process;
char out_string[64];
STRING String = {0, 64, out_string};
KDDBGPRINT("Giving extra info for");
#if MONOPROCESS
Pid = 0;
Tid = hex_to_tid(&gdb_input[17]);
KDDBGPRINT(" %p.\n", Tid);
Thread = find_thread(Pid, Tid);
Process = CONTAINING_RECORD(Thread->Tcb.Process, EPROCESS, Pcb);
#else
Pid = hex_to_pid(&gdb_input[18]);
Tid = hex_to_tid(strstr(&gdb_input[18], ".") + 1);
/* We cannot use PsLookupProcessThreadByCid as we could be running at any IRQL.
* So loop. */
KDDBGPRINT(" p%p.%p.\n", Pid, Tid);
Process = find_process(Pid);
Thread = find_thread(Pid, Tid);
#endif
if (PsGetThreadProcessId(Thread) == 0)
{
String.Length = sprintf(out_string, "SYSTEM");
}
else
{
String.Length = sprintf(out_string, "%.*s", 16, Process->ImageFileName);
}
return gdb_send_debug_io(&String, FALSE);
}
if (strcmp(gdb_input, "qTStatus") == 0)
{
/* No tracepoint support */
return send_gdb_packet("T0");
}
if (strcmp(gdb_input, "qSymbol::") == 0)
{
/* No need */
return send_gdb_packet("OK");
}
if (strncmp(gdb_input, "qXfer:libraries:read::", 22) == 0)
{
static LIST_ENTRY* CurrentEntry = NULL;
char str_helper[256];
char name_helper[64];
ULONG_PTR Offset = hex_to_address(&gdb_input[22]);
ULONG_PTR ToSend = hex_to_address(strstr(&gdb_input[22], ",") + 1);
ULONG Sent = 0;
static BOOLEAN allDone = FALSE;
KDDBGPRINT("KDGDB: qXfer:libraries:read !\n");
/* Start the packet */
start_gdb_packet();
if (allDone)
{
send_gdb_partial_packet("l");
allDone = FALSE;
return finish_gdb_packet();
}
send_gdb_partial_packet("m");
Sent++;
/* Are we starting ? */
if (Offset == 0)
{
Sent += send_gdb_partial_binary("<?xml version=\"1.0\"?>", 21);
Sent += send_gdb_partial_binary("<library-list>", 14);
CurrentEntry = ModuleListHead->Flink;
if (!CurrentEntry)
{
/* Ps is not initialized. Send end of XML data or mark that we are finished. */
Sent += send_gdb_partial_binary("</library-list>", 15);
allDone = TRUE;
return finish_gdb_packet();
}
}
for ( ;
CurrentEntry != ModuleListHead;
CurrentEntry = CurrentEntry->Flink)
{
PLDR_DATA_TABLE_ENTRY TableEntry = CONTAINING_RECORD(CurrentEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
PVOID DllBase = (PVOID)((ULONG_PTR)TableEntry->DllBase + 0x1000);
LONG mem_length;
USHORT i;
/* Convert names to lower case. Yes this _is_ ugly */
for (i = 0; i < (TableEntry->BaseDllName.Length / sizeof(WCHAR)); i++)
{
name_helper[i] = (char)TableEntry->BaseDllName.Buffer[i];
if (name_helper[i] >= 'A' && name_helper[i] <= 'Z')
name_helper[i] += 'a' - 'A';
}
name_helper[i] = 0;
/* GDB doesn't load the file if you don't prefix it with a drive letter... */
mem_length = _snprintf(str_helper, 256, "<library name=\"C:\\%s\"><segment address=\"0x%p\"/></library>", &name_helper, DllBase);
/* DLL name must be too long. */
if (mem_length < 0)
{
KDDBGPRINT("Failed to report %wZ\n", &TableEntry->BaseDllName);
continue;
}
if ((Sent + mem_length) > ToSend)
{
/* We're done for this pass */
return finish_gdb_packet();
}
Sent += send_gdb_partial_binary(str_helper, mem_length);
}
if ((ToSend - Sent) > 15)
{
Sent += send_gdb_partial_binary("</library-list>", 15);
allDone = TRUE;
}
return finish_gdb_packet();
}
KDDBGPRINT("KDGDB: Unknown query: %s\n", gdb_input);
return send_gdb_packet("");
}
#if 0
static
KDSTATUS
handle_gdb_registers(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength)
{
/*
if (gdb_dbg_thread)
KDDBGPRINT("Should get registers from other thread!\n");
*/
State->ApiNumber = DbgKdGetContextApi;
State->ReturnStatus = STATUS_SUCCESS; /* ? */
State->Processor = CurrentStateChange.Processor;
State->ProcessorLevel = CurrentStateChange.ProcessorLevel;
if (MessageData)
MessageData->Length = 0;
*MessageLength = 0;
return KdPacketReceived;
}
#endif
static
BOOLEAN
ReadMemorySendHandler(
_In_ ULONG PacketType,
_In_ PSTRING MessageHeader,
_In_ PSTRING MessageData)
{
DBGKD_MANIPULATE_STATE64* State = (DBGKD_MANIPULATE_STATE64*)MessageHeader->Buffer;
if (PacketType != PACKET_TYPE_KD_STATE_MANIPULATE)
{
// KdAssert
KDDBGPRINT("Wrong packet type (%lu) received after DbgKdReadVirtualMemoryApi request.\n", PacketType);
return FALSE;
}
if (State->ApiNumber != DbgKdReadVirtualMemoryApi)
{
KDDBGPRINT("Wrong API number (%lu) after DbgKdReadVirtualMemoryApi request.\n", State->ApiNumber);
return FALSE;
}
/* Check status. Allow to send partial data. */
if (!MessageData->Length && !NT_SUCCESS(State->ReturnStatus))
send_gdb_ntstatus(State->ReturnStatus);
else
send_gdb_memory(MessageData->Buffer, MessageData->Length);
KdpSendPacketHandler = NULL;
KdpManipulateStateHandler = NULL;
#if MONOPROCESS
if (gdb_dbg_tid != 0)
/* Reset the TLB */
#else
if ((gdb_dbg_pid != 0) && gdb_pid_to_handle(gdb_dbg_pid) != PsGetCurrentProcessId())
#endif
{
/* Only do this if Ps is initialized */
if (ProcessListHead->Flink)
__writecr3(PsGetCurrentProcess()->Pcb.DirectoryTableBase[0]);
}
return TRUE;
}
static
KDSTATUS
handle_gdb_read_mem(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
State->ApiNumber = DbgKdReadVirtualMemoryApi;
State->ReturnStatus = STATUS_SUCCESS; /* ? */
State->Processor = CurrentStateChange.Processor;
State->ProcessorLevel = CurrentStateChange.ProcessorLevel;
if (MessageData)
MessageData->Length = 0;
*MessageLength = 0;
/* Set the TLB according to the process being read. Pid 0 means any process. */
#if MONOPROCESS
if ((gdb_dbg_tid != 0) && gdb_tid_to_handle(gdb_dbg_tid) != PsGetCurrentThreadId())
{
PETHREAD AttachedThread = find_thread(0, gdb_dbg_tid);
PKPROCESS AttachedProcess;
if (AttachedThread == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
AttachedProcess = AttachedThread->Tcb.Process;
if (AttachedProcess == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
__writecr3(AttachedProcess->DirectoryTableBase[0]);
}
#else
if ((gdb_dbg_pid != 0) && gdb_pid_to_handle(gdb_dbg_pid) != PsGetCurrentProcessId())
{
PEPROCESS AttachedProcess = find_process(gdb_dbg_pid);
if (AttachedProcess == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
/* Only do this if Ps is initialized */
if (ProcessListHead->Flink)
__writecr3(AttachedProcess->Pcb.DirectoryTableBase[0]);
}
#endif
State->u.ReadMemory.TargetBaseAddress = hex_to_address(&gdb_input[1]);
State->u.ReadMemory.TransferCount = hex_to_address(strstr(&gdb_input[1], ",") + 1);
/* KD will reply with KdSendPacket. Catch it */
KdpSendPacketHandler = ReadMemorySendHandler;
return KdPacketReceived;
}
static
BOOLEAN
WriteMemorySendHandler(
_In_ ULONG PacketType,
_In_ PSTRING MessageHeader,
_In_ PSTRING MessageData)
{
DBGKD_MANIPULATE_STATE64* State = (DBGKD_MANIPULATE_STATE64*)MessageHeader->Buffer;
if (PacketType != PACKET_TYPE_KD_STATE_MANIPULATE)
{
// KdAssert
KDDBGPRINT("Wrong packet type (%lu) received after DbgKdWriteVirtualMemoryApi request.\n", PacketType);
return FALSE;
}
if (State->ApiNumber != DbgKdWriteVirtualMemoryApi)
{
KDDBGPRINT("Wrong API number (%lu) after DbgKdWriteVirtualMemoryApi request.\n", State->ApiNumber);
return FALSE;
}
/* Check status */
if (!NT_SUCCESS(State->ReturnStatus))
send_gdb_ntstatus(State->ReturnStatus);
else
send_gdb_packet("OK");
KdpSendPacketHandler = NULL;
KdpManipulateStateHandler = NULL;
#if MONOPROCESS
if (gdb_dbg_tid != 0)
/* Reset the TLB */
#else
if ((gdb_dbg_pid != 0) && gdb_pid_to_handle(gdb_dbg_pid) != PsGetCurrentProcessId())
#endif
{
/* Only do this if Ps is initialized */
if (ProcessListHead->Flink)
__writecr3(PsGetCurrentProcess()->Pcb.DirectoryTableBase[0]);
}
return TRUE;
}
static
KDSTATUS
handle_gdb_write_mem(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
/* Maximal input buffer is 0x1000. Each byte is encoded on two bytes by GDB */
static UCHAR OutBuffer[0x800];
ULONG BufferLength;
char* blob_ptr;
UCHAR* OutPtr;
State->ApiNumber = DbgKdWriteVirtualMemoryApi;
State->ReturnStatus = STATUS_SUCCESS; /* ? */
State->Processor = CurrentStateChange.Processor;
State->ProcessorLevel = CurrentStateChange.ProcessorLevel;
/* Set the TLB according to the process being read. Pid 0 means any process. */
#if MONOPROCESS
if ((gdb_dbg_tid != 0) && gdb_tid_to_handle(gdb_dbg_tid) != PsGetCurrentThreadId())
{
PETHREAD AttachedThread = find_thread(0, gdb_dbg_tid);
PKPROCESS AttachedProcess;
if (AttachedThread == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
AttachedProcess = AttachedThread->Tcb.Process;
if (AttachedProcess == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
__writecr3(AttachedProcess->DirectoryTableBase[0]);
}
#else
if ((gdb_dbg_pid != 0) && gdb_pid_to_handle(gdb_dbg_pid) != PsGetCurrentProcessId())
{
PEPROCESS AttachedProcess = find_process(gdb_dbg_pid);
if (AttachedProcess == NULL)
{
KDDBGPRINT("The current GDB debug thread is invalid!");
return LOOP_IF_SUCCESS(send_gdb_packet("E03"));
}
/* Only do this if Ps is initialized */
if (ProcessListHead->Flink)
__writecr3(AttachedProcess->Pcb.DirectoryTableBase[0]);
}
#endif
State->u.WriteMemory.TargetBaseAddress = hex_to_address(&gdb_input[1]);
BufferLength = hex_to_address(strstr(&gdb_input[1], ",") + 1);
if (BufferLength == 0)
{
/* Nothing to do */
return LOOP_IF_SUCCESS(send_gdb_packet("OK"));
}
State->u.WriteMemory.TransferCount = BufferLength;
MessageData->Length = BufferLength;
MessageData->Buffer = (CHAR*)OutBuffer;
OutPtr = OutBuffer;
blob_ptr = strstr(strstr(&gdb_input[1], ",") + 1, ":") + 1;
while (BufferLength)
{
if (BufferLength >= 4)
{
*((ULONG*)OutPtr) = *((ULONG*)blob_ptr);
OutPtr += 4;
blob_ptr += 4;
BufferLength -= 4;
}
else if (BufferLength >= 2)
{
*((USHORT*)OutPtr) = *((USHORT*)blob_ptr);
OutPtr += 2;
blob_ptr += 2;
BufferLength -= 2;
}
else
{
*OutPtr++ = *blob_ptr++;
BufferLength--;
}
}
/* KD will reply with KdSendPacket. Catch it */
KdpSendPacketHandler = WriteMemorySendHandler;
return KdPacketReceived;
}
static
BOOLEAN
WriteBreakPointSendHandler(
_In_ ULONG PacketType,
_In_ PSTRING MessageHeader,
_In_ PSTRING MessageData)
{
DBGKD_MANIPULATE_STATE64* State = (DBGKD_MANIPULATE_STATE64*)MessageHeader->Buffer;
if (PacketType != PACKET_TYPE_KD_STATE_MANIPULATE)
{
// KdAssert
KDDBGPRINT("Wrong packet type (%lu) received after DbgKdWriteBreakPointApi request.\n", PacketType);
return FALSE;
}
if (State->ApiNumber != DbgKdWriteBreakPointApi)
{
KDDBGPRINT("Wrong API number (%lu) after DbgKdWriteBreakPointApi request.\n", State->ApiNumber);
return FALSE;
}
/* Check status */
if (!NT_SUCCESS(State->ReturnStatus))
{
KDDBGPRINT("Inserting breakpoint failed!\n");
send_gdb_ntstatus(State->ReturnStatus);
}
else
{
/* Keep track of the address+handle couple */
ULONG i;
for (i = 0; i < (sizeof(BreakPointHandles) / sizeof(BreakPointHandles[0])); i++)
{
if (BreakPointHandles[i].Address == 0)
{
BreakPointHandles[i].Address = (ULONG_PTR)State->u.WriteBreakPoint.BreakPointAddress;
BreakPointHandles[i].Handle = State->u.WriteBreakPoint.BreakPointHandle;
break;
}
}
send_gdb_packet("OK");
}
KdpSendPacketHandler = NULL;
KdpManipulateStateHandler = NULL;
return TRUE;
}
static
KDSTATUS
handle_gdb_insert_breakpoint(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
State->ReturnStatus = STATUS_SUCCESS; /* ? */
State->Processor = CurrentStateChange.Processor;
State->ProcessorLevel = CurrentStateChange.ProcessorLevel;
if (MessageData)
MessageData->Length = 0;
*MessageLength = 0;
switch (gdb_input[1])
{
case '0':
{
ULONG_PTR Address = hex_to_address(&gdb_input[3]);
ULONG i;
BOOLEAN HasFreeSlot = FALSE;
KDDBGPRINT("Inserting breakpoint at %p.\n", (void*)Address);
for (i = 0; i < (sizeof(BreakPointHandles) / sizeof(BreakPointHandles[0])); i++)
{
if (BreakPointHandles[i].Address == 0)
HasFreeSlot = TRUE;
}
if (!HasFreeSlot)
{
/* We don't have a way to keep track of this break point. Fail. */
KDDBGPRINT("No breakpoint slot available!\n");
return LOOP_IF_SUCCESS(send_gdb_packet("E01"));
}
State->ApiNumber = DbgKdWriteBreakPointApi;
State->u.WriteBreakPoint.BreakPointAddress = Address;
/* FIXME : ignoring all other Z0 arguments */
/* KD will reply with KdSendPacket. Catch it */
KdpSendPacketHandler = WriteBreakPointSendHandler;
return KdPacketReceived;
}
}
KDDBGPRINT("Unhandled 'Z' packet: %s\n", gdb_input);
return LOOP_IF_SUCCESS(send_gdb_packet("E01"));
}
static
BOOLEAN
RestoreBreakPointSendHandler(
_In_ ULONG PacketType,
_In_ PSTRING MessageHeader,
_In_ PSTRING MessageData)
{
DBGKD_MANIPULATE_STATE64* State = (DBGKD_MANIPULATE_STATE64*)MessageHeader->Buffer;
ULONG i;
if (PacketType != PACKET_TYPE_KD_STATE_MANIPULATE)
{
// KdAssert
KDDBGPRINT("Wrong packet type (%lu) received after DbgKdRestoreBreakPointApi request.\n", PacketType);
return FALSE;
}
if (State->ApiNumber != DbgKdRestoreBreakPointApi)
{
KDDBGPRINT("Wrong API number (%lu) after DbgKdRestoreBreakPointApi request.\n", State->ApiNumber);
return FALSE;
}
/* We ignore failure here. If DbgKdRestoreBreakPointApi fails,
* this means that the breakpoint was already invalid for KD. So clean it up on our side. */
for (i = 0; i < (sizeof(BreakPointHandles) / sizeof(BreakPointHandles[0])); i++)
{
if (BreakPointHandles[i].Handle == State->u.RestoreBreakPoint.BreakPointHandle)
{
BreakPointHandles[i].Address = 0;
BreakPointHandles[i].Handle = 0;
break;
}
}
send_gdb_packet("OK");
KdpSendPacketHandler = NULL;
KdpManipulateStateHandler = NULL;
return TRUE;
}
static
KDSTATUS
handle_gdb_remove_breakpoint(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
State->ReturnStatus = STATUS_SUCCESS; /* ? */
State->Processor = CurrentStateChange.Processor;
State->ProcessorLevel = CurrentStateChange.ProcessorLevel;
if (MessageData)
MessageData->Length = 0;
*MessageLength = 0;
switch (gdb_input[1])
{
case '0':
{
ULONG_PTR Address = hex_to_address(&gdb_input[3]);
ULONG i, Handle = 0;
KDDBGPRINT("Removing breakpoint on %p.\n", (void*)Address);
for (i = 0; i < (sizeof(BreakPointHandles) / sizeof(BreakPointHandles[0])); i++)
{
if (BreakPointHandles[i].Address == Address)
{
Handle = BreakPointHandles[i].Handle;
break;
}
}
if (Handle == 0)
{
KDDBGPRINT("Received %s, but breakpoint was never inserted ?!\n", gdb_input);
return LOOP_IF_SUCCESS(send_gdb_packet("E01"));
}
State->ApiNumber = DbgKdRestoreBreakPointApi;
State->u.RestoreBreakPoint.BreakPointHandle = Handle;
/* FIXME : ignoring all other z0 arguments */
/* KD will reply with KdSendPacket. Catch it */
KdpSendPacketHandler = RestoreBreakPointSendHandler;
return KdPacketReceived;
}
}
KDDBGPRINT("Unhandled 'Z' packet: %s\n", gdb_input);
return LOOP_IF_SUCCESS(send_gdb_packet("E01"));
}
static
KDSTATUS
handle_gdb_c(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
KDSTATUS Status;
/* Tell GDB everything is fine, we will handle it */
Status = send_gdb_packet("OK");
if (Status != KdPacketReceived)
return Status;
if (CurrentStateChange.NewState == DbgKdExceptionStateChange)
{
DBGKM_EXCEPTION64* Exception = &CurrentStateChange.u.Exception;
ULONG_PTR ProgramCounter = KdpGetContextPc(&CurrentContext);
/* See if we should update the program counter */
if ((Exception->ExceptionRecord.ExceptionCode == STATUS_BREAKPOINT)
&& ((*(KD_BREAKPOINT_TYPE*)ProgramCounter) == KD_BREAKPOINT_VALUE))
{
/* We must get past the breakpoint instruction */
KdpSetContextPc(&CurrentContext, ProgramCounter + KD_BREAKPOINT_SIZE);
SetContextManipulateHandler(State, MessageData, MessageLength, KdContext);
KdpManipulateStateHandler = ContinueManipulateStateHandler;
return KdPacketReceived;
}
#if defined(_M_IX86) || defined(_M_AMD64)
if ((Exception->ExceptionRecord.ExceptionCode == STATUS_ASSERTION_FAILURE)
&& ((*(KD_BREAKPOINT_TYPE*)ProgramCounter) == 0xCD)
&& (*((KD_BREAKPOINT_TYPE*)ProgramCounter + 1) == 0x2C))
{
/* INT 2C (a.k.a. runtime check failure) */
KdpSetContextPc(&CurrentContext, ProgramCounter + 2);
SetContextManipulateHandler(State, MessageData, MessageLength, KdContext);
KdpManipulateStateHandler = ContinueManipulateStateHandler;
return KdPacketReceived;
}
#endif
}
return ContinueManipulateStateHandler(State, MessageData, MessageLength, KdContext);
}
static
KDSTATUS
handle_gdb_s(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
KDDBGPRINT("Single stepping.\n");
/* Set CPU single step mode and continue */
KdpSetSingleStep(&CurrentContext);
SetContextManipulateHandler(State, MessageData, MessageLength, KdContext);
KdpManipulateStateHandler = ContinueManipulateStateHandler;
return KdPacketReceived;
}
static
KDSTATUS
handle_gdb_v(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
if (strncmp(gdb_input, "vCont", 5) == 0)
{
if (gdb_input[5] == '?')
{
/* Report what we support */
return LOOP_IF_SUCCESS(send_gdb_packet("vCont;c;s"));
}
if (strncmp(gdb_input, "vCont;c", 7) == 0)
{
return handle_gdb_c(State, MessageData, MessageLength, KdContext);
}
if (strncmp(gdb_input, "vCont;s", 7) == 0)
{
return handle_gdb_s(State, MessageData, MessageLength, KdContext);
}
}
KDDBGPRINT("Unhandled 'v' packet: %s\n", gdb_input);
return LOOP_IF_SUCCESS(send_gdb_packet(""));
}
KDSTATUS
gdb_receive_and_interpret_packet(
_Out_ DBGKD_MANIPULATE_STATE64* State,
_Out_ PSTRING MessageData,
_Out_ PULONG MessageLength,
_Inout_ PKD_CONTEXT KdContext)
{
KDSTATUS Status;
do
{
KDDBGPRINT("KDGBD: Receiving packet.\n");
Status = gdb_receive_packet(KdContext);
KDDBGPRINT("KDGBD: Packet \"%s\" received with status %u\n", gdb_input, Status);
if (Status != KdPacketReceived)
return Status;
Status = (KDSTATUS)-1;
switch (gdb_input[0])
{
case '?':
/* Send the Status */
Status = LOOP_IF_SUCCESS(gdb_send_exception());
break;
case '!':
Status = LOOP_IF_SUCCESS(send_gdb_packet("OK"));
break;
case 'c':
case 'C':
Status = handle_gdb_c(State, MessageData, MessageLength, KdContext);
break;
case 'g':
Status = LOOP_IF_SUCCESS(gdb_send_registers());
break;
case 'H':
Status = LOOP_IF_SUCCESS(handle_gdb_set_thread());
break;
case 'm':
Status = handle_gdb_read_mem(State, MessageData, MessageLength, KdContext);
break;
case 'p':
Status = LOOP_IF_SUCCESS(gdb_send_register());
break;
case 'q':
Status = LOOP_IF_SUCCESS(handle_gdb_query());
break;
case 's':
Status = handle_gdb_s(State, MessageData, MessageLength, KdContext);
break;
case 'T':
Status = LOOP_IF_SUCCESS(handle_gdb_thread_alive());
break;
case 'v':
Status = handle_gdb_v(State, MessageData, MessageLength, KdContext);
break;
case 'X':
Status = handle_gdb_write_mem(State, MessageData, MessageLength, KdContext);
break;
case 'z':
Status = handle_gdb_remove_breakpoint(State, MessageData, MessageLength, KdContext);
break;
case 'Z':
Status = handle_gdb_insert_breakpoint(State, MessageData, MessageLength, KdContext);
break;
default:
/* We don't know how to handle this request. */
KDDBGPRINT("Unsupported GDB command: %s.\n", gdb_input);
Status = LOOP_IF_SUCCESS(send_gdb_packet(""));
}
} while (Status == (KDSTATUS)-1);
return Status;
}
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