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DBGCGdbRemoteStub.cpp

Last change on this file was 103433, checked in by vboxsync, 2 months ago
Debugger: Some warning fixes, bugref:3409
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 100.7 KB

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1	/* $Id: DBGCGdbRemoteStub.cpp 103433 2024-02-19 12:11:34Z vboxsync $ */
2	/** @file
3	* DBGC - Debugger Console, GDB Remote Stub.
4	*/
5
6	/*
7	* Copyright (C) 2010-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#include <VBox/dbg.h>
33	#include <VBox/vmm/dbgf.h>
34	#include <VBox/vmm/vmapi.h> /* VMR3GetVM() */
35	#include <VBox/vmm/hm.h> /* HMR3IsEnabled */
36	#include <VBox/vmm/nem.h> /* NEMR3IsEnabled */
37	#include <iprt/cdefs.h>
38	#include <iprt/err.h>
39	#include <iprt/list.h>
40	#include <iprt/mem.h>
41	#include <iprt/string.h>
42
43	#include <stdlib.h>
44
45	#include "DBGCInternal.h"
46
47
48	/*********************************************************************************************************************************
49	* Defined Constants And Macros *
50	*********************************************************************************************************************************/
51
52	/** Character indicating the start of a packet. */
53	#define GDBSTUB_PKT_START '$'
54	/** Character indicating the end of a packet (excluding the checksum). */
55	#define GDBSTUB_PKT_END '#'
56	/** The escape character. */
57	#define GDBSTUB_PKT_ESCAPE '{'
58	/** The out-of-band interrupt character. */
59	#define GDBSTUB_OOB_INTERRUPT 0x03
60
61
62	/** Indicate support for the 'qXfer:features:read' packet to support the target description. */
63	#define GDBSTUBCTX_FEATURES_F_TGT_DESC RT_BIT(0)
64
65
66	/*********************************************************************************************************************************
67	* Structures and Typedefs *
68	*********************************************************************************************************************************/
69
70	/**
71	* Trace point type.
72	*/
73	typedef enum GDBSTUBTPTYPE
74	{
75	/** Invalid type, do not use. */
76	GDBSTUBTPTYPE_INVALID = 0,
77	/** An instruction software trace point. */
78	GDBSTUBTPTYPE_EXEC_SW,
79	/** An instruction hardware trace point. */
80	GDBSTUBTPTYPE_EXEC_HW,
81	/** A memory read trace point. */
82	GDBSTUBTPTYPE_MEM_READ,
83	/** A memory write trace point. */
84	GDBSTUBTPTYPE_MEM_WRITE,
85	/** A memory access trace point. */
86	GDBSTUBTPTYPE_MEM_ACCESS,
87	/** 32bit hack. */
88	GDBSTUBTPTYPE_32BIT_HACK = 0x7fffffff
89	} GDBSTUBTPTYPE;
90
91
92	/**
93	* GDB stub receive state.
94	*/
95	typedef enum GDBSTUBRECVSTATE
96	{
97	/** Invalid state. */
98	GDBSTUBRECVSTATE_INVALID = 0,
99	/** Waiting for the start character. */
100	GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START,
101	/** Reiceiving the packet body up until the END character. */
102	GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY,
103	/** Receiving the checksum. */
104	GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM,
105	/** Blow up the enum to 32bits for easier alignment of members in structs. */
106	GDBSTUBRECVSTATE_32BIT_HACK = 0x7fffffff
107	} GDBSTUBRECVSTATE;
108
109
110	/**
111	* GDB target register descriptor.
112	*/
113	typedef struct GDBREGDESC
114	{
115	/** Register name. */
116	const char *pszName;
117	/** DBGF register index. */
118	DBGFREG enmReg;
119	/** Bitsize */
120	uint32_t cBits;
121	/** Type. */
122	const char *pszType;
123	/** Group. */
124	const char *pszGroup;
125	} GDBREGDESC;
126	/** Pointer to a GDB target register descriptor. */
127	typedef GDBREGDESC *PGDBREGDESC;
128	/** Pointer to a const GDB target register descriptor. */
129	typedef const GDBREGDESC *PCGDBREGDESC;
130
131
132	/**
133	* A tracepoint descriptor.
134	*/
135	typedef struct GDBSTUBTP
136	{
137	/** List node for the list of tracepoints. */
138	RTLISTNODE NdTps;
139	/** The breakpoint number from the DBGF API. */
140	uint32_t iBp;
141	/** The tracepoint type for identification. */
142	GDBSTUBTPTYPE enmTpType;
143	/** The tracepoint address for identification. */
144	uint64_t GdbTgtAddr;
145	/** The tracepoint kind for identification. */
146	uint64_t uKind;
147	} GDBSTUBTP;
148	/** Pointer to a tracepoint. */
149	typedef GDBSTUBTP *PGDBSTUBTP;
150
151
152	/**
153	* GDB stub context data.
154	*/
155	typedef struct GDBSTUBCTX
156	{
157	/** Internal debugger console data. */
158	DBGC Dbgc;
159	/** The current state when receiving a new packet. */
160	GDBSTUBRECVSTATE enmState;
161	/** Maximum number of bytes the packet buffer can hold. */
162	size_t cbPktBufMax;
163	/** Current offset into the packet buffer. */
164	size_t offPktBuf;
165	/** The size of the packet (minus the start, end characters and the checksum). */
166	size_t cbPkt;
167	/** Pointer to the packet buffer data. */
168	uint8_t *pbPktBuf;
169	/** Number of bytes left for the checksum. */
170	size_t cbChksumRecvLeft;
171	/** Send packet checksum. */
172	uint8_t uChkSumSend;
173	/** Feature flags supported we negotiated with the remote end. */
174	uint32_t fFeatures;
175	/** Pointer to the XML target description. */
176	char *pachTgtXmlDesc;
177	/** Size of the XML target description. */
178	size_t cbTgtXmlDesc;
179	/** Pointer to the selected GDB register set. */
180	PCGDBREGDESC paRegs;
181	/** Number of entries in the register set. */
182	uint32_t cRegs;
183	/** Flag whether the stub is in extended mode. */
184	bool fExtendedMode;
185	/** Flag whether was something was output using the 'O' packet since it was reset last. */
186	bool fOutput;
187	/** List of registered trace points.
188	* GDB removes breakpoints/watchpoints using the parameters they were
189	* registered with while we only use the BP number form DBGF internally.
190	* Means we have to track all registration so we can remove them later on. */
191	RTLISTANCHOR LstTps;
192	/** Flag whether a ThreadInfo query was started. */
193	bool fInThrdInfoQuery;
194	/** Next ID to return in the current ThreadInfo query. */
195	VMCPUID idCpuNextThrdInfoQuery;
196	} GDBSTUBCTX;
197	/** Pointer to the GDB stub context data. */
198	typedef GDBSTUBCTX *PGDBSTUBCTX;
199	/** Pointer to const GDB stub context data. */
200	typedef const GDBSTUBCTX *PCGDBSTUBCTX;
201	/** Pointer to a GDB stub context data pointer. */
202	typedef PGDBSTUBCTX *PPGDBSTUBCTX;
203
204
205	/**
206	* Specific query packet processor callback.
207	*
208	* @returns Status code.
209	* @param pThis The GDB stub context.
210	* @param pbVal Pointer to the remaining value.
211	* @param cbVal Size of the remaining value in bytes.
212	*/
213	typedef DECLCALLBACKTYPE(int, FNGDBSTUBQPKTPROC,(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal));
214	typedef FNGDBSTUBQPKTPROC *PFNGDBSTUBQPKTPROC;
215
216
217	/**
218	* 'q' packet processor.
219	*/
220	typedef struct GDBSTUBQPKTPROC
221	{
222	/** Name */
223	const char *pszName;
224	/** Length of name in characters (without \0 terminator). */
225	uint32_t cchName;
226	/** The callback to call for processing the particular query. */
227	PFNGDBSTUBQPKTPROC pfnProc;
228	} GDBSTUBQPKTPROC;
229	/** Pointer to a 'q' packet processor entry. */
230	typedef GDBSTUBQPKTPROC *PGDBSTUBQPKTPROC;
231	/** Pointer to a const 'q' packet processor entry. */
232	typedef const GDBSTUBQPKTPROC *PCGDBSTUBQPKTPROC;
233
234
235	/**
236	* 'v' packet processor.
237	*/
238	typedef struct GDBSTUBVPKTPROC
239	{
240	/** Name */
241	const char *pszName;
242	/** Length of name in characters (without \0 terminator). */
243	uint32_t cchName;
244	/** Replay to a query packet (ends with ?). */
245	const char *pszReplyQ;
246	/** Length of the query reply (without \0 terminator). */
247	uint32_t cchReplyQ;
248	/** The callback to call for processing the particular query. */
249	PFNGDBSTUBQPKTPROC pfnProc;
250	} GDBSTUBVPKTPROC;
251	/** Pointer to a 'q' packet processor entry. */
252	typedef GDBSTUBVPKTPROC *PGDBSTUBVPKTPROC;
253	/** Pointer to a const 'q' packet processor entry. */
254	typedef const GDBSTUBVPKTPROC *PCGDBSTUBVPKTPROC;
255
256
257	/**
258	* Feature callback.
259	*
260	* @returns Status code.
261	* @param pThis The GDB stub context.
262	* @param pbVal Pointer to the value.
263	* @param cbVal Size of the value in bytes.
264	*/
265	typedef DECLCALLBACKTYPE(int, FNGDBSTUBFEATHND,(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal));
266	typedef FNGDBSTUBFEATHND *PFNGDBSTUBFEATHND;
267
268
269	/**
270	* GDB feature descriptor.
271	*/
272	typedef struct GDBSTUBFEATDESC
273	{
274	/** Feature name */
275	const char *pszName;
276	/** Length of the feature name in characters (without \0 terminator). */
277	uint32_t cchName;
278	/** The callback to call for processing the particular feature. */
279	PFNGDBSTUBFEATHND pfnHandler;
280	/** Flag whether the feature requires a value. */
281	bool fVal;
282	} GDBSTUBFEATDESC;
283	/** Pointer to a GDB feature descriptor. */
284	typedef GDBSTUBFEATDESC *PGDBSTUBFEATDESC;
285	/** Pointer to a const GDB feature descriptor. */
286	typedef const GDBSTUBFEATDESC *PCGDBSTUBFEATDESC;
287
288
289	/*********************************************************************************************************************************
290	* Internal Functions *
291	*********************************************************************************************************************************/
292
293
294	/**
295	* Tries to find a trace point with the given parameters in the list of registered trace points.
296	*
297	* @returns Pointer to the trace point registration record if found or NULL if none was found.
298	* @param pThis The GDB stub context.
299	* @param enmTpType The trace point type.
300	* @param GdbTgtAddr Target address given by GDB.
301	* @param uKind Trace point kind.
302	*/
303	static PGDBSTUBTP dbgcGdbStubTpFind(PGDBSTUBCTX pThis, GDBSTUBTPTYPE enmTpType, uint64_t GdbTgtAddr, uint64_t uKind)
304	{
305	PGDBSTUBTP pTpCur = NULL;
306	RTListForEach(&pThis->LstTps, pTpCur, GDBSTUBTP, NdTps)
307	{
308	if ( pTpCur->enmTpType == enmTpType
309	&& pTpCur->GdbTgtAddr == GdbTgtAddr
310	&& pTpCur->uKind == uKind)
311	return pTpCur;
312	}
313
314	return NULL;
315	}
316
317
318	/**
319	* Registers a new trace point.
320	*
321	* @returns VBox status code.
322	* @param pThis The GDB stub context.
323	* @param enmTpType The trace point type.
324	* @param GdbTgtAddr Target address given by GDB.
325	* @param uKind Trace point kind.
326	* @param iBp The internal DBGF breakpoint ID this trace point was registered with.
327	*/
328	static int dbgcGdbStubTpRegister(PGDBSTUBCTX pThis, GDBSTUBTPTYPE enmTpType, uint64_t GdbTgtAddr, uint64_t uKind, uint32_t iBp)
329	{
330	int rc = VERR_ALREADY_EXISTS;
331
332	/* Can't register a tracepoint with the same parameters twice or we can't decide whom to remove later on. */
333	PGDBSTUBTP pTp = dbgcGdbStubTpFind(pThis, enmTpType, GdbTgtAddr, uKind);
334	if (!pTp)
335	{
336	pTp = (PGDBSTUBTP)RTMemAllocZ(sizeof(*pTp));
337	if (pTp)
338	{
339	pTp->enmTpType = enmTpType;
340	pTp->GdbTgtAddr = GdbTgtAddr;
341	pTp->uKind = uKind;
342	pTp->iBp = iBp;
343	RTListAppend(&pThis->LstTps, &pTp->NdTps);
344	rc = VINF_SUCCESS;
345	}
346	else
347	rc = VERR_NO_MEMORY;
348	}
349
350	return rc;
351	}
352
353
354	/**
355	* Deregisters the given trace point (needs to be unregistered from DBGF by the caller before).
356	*
357	* @param pTp The trace point to deregister.
358	*/
359	static void dbgcGdbStubTpDeregister(PGDBSTUBTP pTp)
360	{
361	RTListNodeRemove(&pTp->NdTps);
362	RTMemFree(pTp);
363	}
364
365
366	/**
367	* Converts a given to the hexadecimal value if valid.
368	*
369	* @returns The hexadecimal value the given character represents 0-9,a-f,A-F or 0xff on error.
370	* @param ch The character to convert.
371	*/
372	DECLINLINE(uint8_t) dbgcGdbStubCtxChrToHex(char ch)
373	{
374	if (ch >= '0' && ch <= '9')
375	return ch - '0';
376	if (ch >= 'A' && ch <= 'F')
377	return ch - 'A' + 0xa;
378	if (ch >= 'a' && ch <= 'f')
379	return ch - 'a' + 0xa;
380
381	return 0xff;
382	}
383
384
385	/**
386	* Converts a 4bit hex number to the appropriate character.
387	*
388	* @returns Character representing the 4bit hex number.
389	* @param uHex The 4 bit hex number.
390	*/
391	DECLINLINE(char) dbgcGdbStubCtxHexToChr(uint8_t uHex)
392	{
393	if (uHex < 0xa)
394	return '0' + uHex;
395	if (uHex <= 0xf)
396	return 'A' + uHex - 0xa;
397
398	return 'X';
399	}
400
401
402	/**
403	* Wrapper for the I/O interface write callback.
404	*
405	* @returns Status code.
406	* @param pThis The GDB stub context.
407	* @param pvPkt The packet data to send.
408	* @param cbPkt Size of the packet in bytes.
409	*/
410	DECLINLINE(int) dbgcGdbStubCtxWrite(PGDBSTUBCTX pThis, const void *pvPkt, size_t cbPkt)
411	{
412	return pThis->Dbgc.pIo->pfnWrite(pThis->Dbgc.pIo, pvPkt, cbPkt, NULL /pcbWritten/);
413	}
414
415
416	/**
417	* Starts transmission of a new reply packet.
418	*
419	* @returns Status code.
420	* @param pThis The GDB stub context.
421	*/
422	static int dbgcGdbStubCtxReplySendBegin(PGDBSTUBCTX pThis)
423	{
424	pThis->uChkSumSend = 0;
425
426	uint8_t chPktStart = GDBSTUB_PKT_START;
427	return dbgcGdbStubCtxWrite(pThis, &chPktStart, sizeof(chPktStart));
428	}
429
430
431	/**
432	* Sends the given data in the reply.
433	*
434	* @returns Status code.
435	* @param pThis The GDB stub context.
436	* @param pvReplyData The reply data to send.
437	* @param cbReplyData Size of the reply data in bytes.
438	*/
439	static int dbgcGdbStubCtxReplySendData(PGDBSTUBCTX pThis, const void *pvReplyData, size_t cbReplyData)
440	{
441	/* Update checksum. */
442	const uint8_t pbData = (const uint8_t )pvReplyData;
443	for (uint32_t i = 0; i < cbReplyData; i++)
444	pThis->uChkSumSend += pbData[i];
445
446	return dbgcGdbStubCtxWrite(pThis, pvReplyData, cbReplyData);
447	}
448
449
450	/**
451	* Finishes transmission of the current reply by sending the packet end character and the checksum.
452	*
453	* @returns Status code.
454	* @param pThis The GDB stub context.
455	*/
456	static int dbgcGdbStubCtxReplySendEnd(PGDBSTUBCTX pThis)
457	{
458	uint8_t achPktEnd[3];
459
460	achPktEnd[0] = GDBSTUB_PKT_END;
461	achPktEnd[1] = dbgcGdbStubCtxHexToChr(pThis->uChkSumSend >> 4);
462	achPktEnd[2] = dbgcGdbStubCtxHexToChr(pThis->uChkSumSend & 0xf);
463
464	return dbgcGdbStubCtxWrite(pThis, &achPktEnd[0], sizeof(achPktEnd));
465	}
466
467
468	/**
469	* Sends the given reply packet, doing the framing, checksumming, etc. in one call.
470	*
471	* @returns Status code.
472	* @param pThis The GDB stub context.
473	* @param pvReplyPkt The reply packet to send.
474	* @param cbReplyPkt Size of the reply packet in bytes.
475	*/
476	static int dbgcGdbStubCtxReplySend(PGDBSTUBCTX pThis, const void *pvReplyPkt, size_t cbReplyPkt)
477	{
478	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
479	if (RT_SUCCESS(rc))
480	{
481	rc = dbgcGdbStubCtxReplySendData(pThis, pvReplyPkt, cbReplyPkt);
482	if (RT_SUCCESS(rc))
483	rc = dbgcGdbStubCtxReplySendEnd(pThis);
484	}
485
486	return rc;
487	}
488
489
490	/**
491	* Encodes the given buffer as a hexstring string it into the given destination buffer.
492	*
493	* @returns Status code.
494	* @param pbDst Where store the resulting hex string on success.
495	* @param cbDst Size of the destination buffer in bytes.
496	* @param pvSrc The data to encode.
497	* @param cbSrc Number of bytes to encode.
498	*/
499	DECLINLINE(int) dbgcGdbStubCtxEncodeBinaryAsHex(uint8_t pbDst, size_t cbDst, const void pvSrc, size_t cbSrc)
500	{
501	return RTStrPrintHexBytes((char *)pbDst, cbDst, pvSrc, cbSrc, RTSTRPRINTHEXBYTES_F_UPPER);
502	}
503
504
505	/**
506	* Decodes the given ASCII hexstring as binary data up until the given separator is found or the end of the string is reached.
507	*
508	* @returns Status code.
509	* @param pbBuf The buffer containing the hexstring to convert.
510	* @param cbBuf Size of the buffer in bytes.
511	* @param puVal Where to store the decoded integer.
512	* @param chSep The character to stop conversion at.
513	* @param ppbSep Where to store the pointer in the buffer where the separator was found, optional.
514	*/
515	static int dbgcGdbStubCtxParseHexStringAsInteger(const uint8_t pbBuf, size_t cbBuf, uint64_t puVal, uint8_t chSep, const uint8_t **ppbSep)
516	{
517	uint64_t uVal = 0;
518
519	while ( cbBuf
520	&& *pbBuf != chSep)
521	{
522	uVal = uVal * 16 + dbgcGdbStubCtxChrToHex(*pbBuf++);
523	cbBuf--;
524	}
525
526	*puVal = uVal;
527
528	if (ppbSep)
529	*ppbSep = pbBuf;
530
531	return VINF_SUCCESS;
532	}
533
534
535	/**
536	* Decodes the given ASCII hexstring as a byte buffer up until the given separator is found or the end of the string is reached.
537	*
538	* @returns Status code.
539	* @param pbBuf The buffer containing the hexstring to convert.
540	* @param cbBuf Size of the buffer in bytes.
541	* @param pvDst Where to store the decoded data.
542	* @param cbDst Maximum buffer size in bytes.
543	* @param pcbDecoded Where to store the number of consumed bytes from the input.
544	*/
545	DECLINLINE(int) dbgcGdbStubCtxParseHexStringAsByteBuf(const uint8_t pbBuf, size_t cbBuf, void pvDst, size_t cbDst, size_t *pcbDecoded)
546	{
547	size_t cbDecode = RT_MIN(cbBuf, cbDst * 2);
548
549	if (pcbDecoded)
550	*pcbDecoded = cbDecode;
551
552	return RTStrConvertHexBytes((const char )pbBuf, pvDst, cbDecode, 0 / fFlags*/);
553	}
554
555	#if 0 /unused for now/
556	/**
557	* Sends a 'OK' part of a reply packet only (packet start and end needs to be handled separately).
558	*
559	* @returns Status code.
560	* @param pThis The GDB stub context.
561	*/
562	static int dbgcGdbStubCtxReplySendOkData(PGDBSTUBCTX pThis)
563	{
564	char achOk[2] = { 'O', 'K' };
565	return dbgcGdbStubCtxReplySendData(pThis, &achOk[0], sizeof(achOk));
566	}
567	#endif
568
569
570	/**
571	* Sends a 'OK' reply packet.
572	*
573	* @returns Status code.
574	* @param pThis The GDB stub context.
575	*/
576	static int dbgcGdbStubCtxReplySendOk(PGDBSTUBCTX pThis)
577	{
578	char achOk[2] = { 'O', 'K' };
579	return dbgcGdbStubCtxReplySend(pThis, &achOk[0], sizeof(achOk));
580	}
581
582	#if 0 /unused for now/
583	/**
584	* Sends a 'E NN' part of a reply packet only (packet start and end needs to be handled separately).
585	*
586	* @returns Status code.
587	* @param pThis The GDB stub context.
588	* @param uErr The error code to send.
589	*/
590	static int dbgcGdbStubCtxReplySendErrData(PGDBSTUBCTX pThis, uint8_t uErr)
591	{
592	char achErr[3] = { 'E', 0, 0 };
593	achErr[1] = dbgcGdbStubCtxHexToChr(uErr >> 4);
594	achErr[2] = dbgcGdbStubCtxHexToChr(uErr & 0xf);
595	return dbgcGdbStubCtxReplySendData(pThis, &achErr[0], sizeof(achErr));
596	}
597	#endif
598
599	/**
600	* Sends a 'E NN' reply packet.
601	*
602	* @returns Status code.
603	* @param pThis The GDB stub context.
604	* @param uErr The error code to send.
605	*/
606	static int dbgcGdbStubCtxReplySendErr(PGDBSTUBCTX pThis, uint8_t uErr)
607	{
608	char achErr[3] = { 'E', 0, 0 };
609	achErr[1] = dbgcGdbStubCtxHexToChr(uErr >> 4);
610	achErr[2] = dbgcGdbStubCtxHexToChr(uErr & 0xf);
611	return dbgcGdbStubCtxReplySend(pThis, &achErr[0], sizeof(achErr));
612	}
613
614
615	/**
616	* Sends a signal trap (S 05) packet to indicate that the target has stopped.
617	*
618	* @returns Status code.
619	* @param pThis The GDB stub context.
620	*/
621	static int dbgcGdbStubCtxReplySendSigTrap(PGDBSTUBCTX pThis)
622	{
623	char achReply[32];
624	ssize_t cchStr = RTStrPrintf2(&achReply[0], sizeof(achReply), "T05thread:%02x;", pThis->Dbgc.idCpu + 1);
625	return dbgcGdbStubCtxReplySend(pThis, &achReply[0], cchStr);
626	}
627
628
629	/**
630	* Sends a GDB stub status code indicating an error using the error reply packet.
631	*
632	* @returns Status code.
633	* @param pThis The GDB stub context.
634	* @param rc The status code to send.
635	*/
636	static int dbgcGdbStubCtxReplySendErrSts(PGDBSTUBCTX pThis, int rc)
637	{
638	/** @todo convert error codes maybe. */
639	return dbgcGdbStubCtxReplySendErr(pThis, (-rc) & 0xff);
640	}
641
642
643	/**
644	* Ensures that there is at least the given amount of bytes of free space left in the packet buffer.
645	*
646	* @returns Status code (error when increasing the buffer failed).
647	* @param pThis The GDB stub context.
648	* @param cbSpace Number of bytes required.
649	*/
650	static int dbgcGdbStubCtxEnsurePktBufSpace(PGDBSTUBCTX pThis, size_t cbSpace)
651	{
652	if (pThis->cbPktBufMax - pThis->offPktBuf >= cbSpace)
653	return VINF_SUCCESS;
654
655	/* Slow path allocate new buffer and copy content over. */
656	int rc = VINF_SUCCESS;
657	size_t cbPktBufMaxNew = pThis->cbPktBufMax + cbSpace;
658	void *pvNew = RTMemRealloc(pThis->pbPktBuf, cbPktBufMaxNew);
659	if (pvNew)
660	{
661	pThis->pbPktBuf = (uint8_t *)pvNew;
662	pThis->cbPktBufMax = cbPktBufMaxNew;
663	}
664	else
665	rc = VERR_NO_MEMORY;
666
667	return rc;
668	}
669
670
671	/**
672	* Parses the arguments of a 'Z' and 'z' packet.
673	*
674	* @returns Status code.
675	* @param pbArgs Pointer to the start of the first argument.
676	* @param cbArgs Number of argument bytes.
677	* @param penmTpType Where to store the tracepoint type on success.
678	* @param pGdbTgtAddr Where to store the address on success.
679	* @param puKind Where to store the kind argument on success.
680	*/
681	static int dbgcGdbStubCtxParseTpPktArgs(const uint8_t pbArgs, size_t cbArgs, GDBSTUBTPTYPE penmTpType, uint64_t pGdbTgtAddr, uint64_t puKind)
682	{
683	const uint8_t *pbPktSep = NULL;
684	uint64_t uType = 0;
685
686	int rc = dbgcGdbStubCtxParseHexStringAsInteger(pbArgs, cbArgs, &uType,
687	',', &pbPktSep);
688	if (RT_SUCCESS(rc))
689	{
690	cbArgs -= (uintptr_t)(pbPktSep - pbArgs) - 1;
691	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, cbArgs, pGdbTgtAddr,
692	',', &pbPktSep);
693	if (RT_SUCCESS(rc))
694	{
695	cbArgs -= (uintptr_t)(pbPktSep - pbArgs) - 1;
696	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, cbArgs, puKind,
697	GDBSTUB_PKT_END, NULL);
698	if (RT_SUCCESS(rc))
699	{
700	switch (uType)
701	{
702	case 0:
703	*penmTpType = GDBSTUBTPTYPE_EXEC_SW;
704	break;
705	case 1:
706	*penmTpType = GDBSTUBTPTYPE_EXEC_HW;
707	break;
708	case 2:
709	*penmTpType = GDBSTUBTPTYPE_MEM_WRITE;
710	break;
711	case 3:
712	*penmTpType = GDBSTUBTPTYPE_MEM_READ;
713	break;
714	case 4:
715	*penmTpType = GDBSTUBTPTYPE_MEM_ACCESS;
716	break;
717	default:
718	rc = VERR_INVALID_PARAMETER;
719	break;
720	}
721	}
722	}
723	}
724
725	return rc;
726	}
727
728
729	/**
730	* Processes the 'TStatus' query.
731	*
732	* @returns Status code.
733	* @param pThis The GDB stub context.
734	* @param pbArgs Pointer to the start of the arguments in the packet.
735	* @param cbArgs Size of arguments in bytes.
736	*/
737	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryTStatus(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
738	{
739	RT_NOREF(pbArgs, cbArgs);
740
741	char achReply[2] = { 'T', '0' };
742	return dbgcGdbStubCtxReplySend(pThis, &achReply[0], sizeof(achReply));
743	}
744
745
746	/**
747	* @copydoc FNGDBSTUBQPKTPROC
748	*/
749	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessFeatXmlRegs(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal)
750	{
751	/*
752	* xmlRegisters contain a list of supported architectures delimited by ','.
753	* Check that the architecture is in the supported list.
754	*/
755	while (cbVal)
756	{
757	/* Find the next delimiter. */
758	size_t cbThisVal = cbVal;
759	const uint8_t pbDelim = (const uint8_t )memchr(pbVal, ',', cbVal);
760	if (pbDelim)
761	cbThisVal = pbDelim - pbVal;
762
763	const size_t cchArch64 = sizeof("i386:x86-64") - 1;
764	const size_t cchArch32 = sizeof("i386") - 1;
765	if ( !memcmp(pbVal, "i386:x86-64", RT_MIN(cbVal, cchArch64))
766	\|\| !memcmp(pbVal, "i386", RT_MIN(cbVal, cchArch32)))
767	{
768	/* Set the flag to support the qXfer:features:read packet. */
769	pThis->fFeatures \|= GDBSTUBCTX_FEATURES_F_TGT_DESC;
770	break;
771	}
772
773	cbVal -= cbThisVal + (pbDelim ? 1 : 0);
774	pbVal = pbDelim + (pbDelim ? 1 : 0);
775	}
776
777	return VINF_SUCCESS;
778	}
779
780
781	/**
782	* Features which can be reported by the remote GDB which we might support.
783	*
784	* @note The sorting matters for features which start the same, the longest must come first.
785	*/
786	static const GDBSTUBFEATDESC g_aGdbFeatures[] =
787	{
788	#define GDBSTUBFEATDESC_INIT(a_Name, a_pfnHnd, a_fVal) { a_Name, sizeof(a_Name) - 1, a_pfnHnd, a_fVal }
789	GDBSTUBFEATDESC_INIT("xmlRegisters", dbgcGdbStubCtxPktProcessFeatXmlRegs, true),
790	#undef GDBSTUBFEATDESC_INIT
791	};
792
793
794	/**
795	* Calculates the feature length of the next feature pointed to by the given arguments buffer.
796	*
797	* @returns Status code.
798	* @param pbArgs Pointer to the start of the arguments in the packet.
799	* @param cbArgs Size of arguments in bytes.
800	* @param pcbArg Where to store the size of the argument in bytes on success (excluding the delimiter).
801	* @param pfTerminator Whereto store the flag whether the packet terminator (#) was seen as a delimiter.
802	*/
803	static int dbgcGdbStubCtxQueryPktQueryFeatureLen(const uint8_t pbArgs, size_t cbArgs, size_t pcbArg, bool *pfTerminator)
804	{
805	const uint8_t *pbArgCur = pbArgs;
806
807	while ( cbArgs
808	&& *pbArgCur != ';'
809	&& *pbArgCur != GDBSTUB_PKT_END)
810	{
811	cbArgs--;
812	pbArgCur++;
813	}
814
815	if ( !cbArgs
816	&& *pbArgCur != ';'
817	&& *pbArgCur != GDBSTUB_PKT_END)
818	return VERR_NET_PROTOCOL_ERROR;
819
820	*pcbArg = pbArgCur - pbArgs;
821	pfTerminator = pbArgCur == GDBSTUB_PKT_END ? true : false;
822
823	return VINF_SUCCESS;
824	}
825
826
827	/**
828	* Sends the reply to the 'qSupported' packet.
829	*
830	* @returns Status code.
831	* @param pThis The GDB stub context.
832	*/
833	static int dbgcGdbStubCtxPktProcessQuerySupportedReply(PGDBSTUBCTX pThis)
834	{
835	/** @todo Enhance. */
836	if (pThis->fFeatures & GDBSTUBCTX_FEATURES_F_TGT_DESC)
837	return dbgcGdbStubCtxReplySend(pThis, "qXfer:features:read+;vContSupported+", sizeof("qXfer:features:read+;vContSupported+") - 1);
838
839	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
840	}
841
842
843	/**
844	* Processes the 'Supported' query.
845	*
846	* @returns Status code.
847	* @param pThis The GDB stub context.
848	* @param pbArgs Pointer to the start of the arguments in the packet.
849	* @param cbArgs Size of arguments in bytes.
850	*/
851	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQuerySupported(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
852	{
853	/* Skip the : following the qSupported start. */
854	if ( cbArgs < 1
855	\|\| pbArgs[0] != ':')
856	return VERR_NET_PROTOCOL_ERROR;
857
858	cbArgs--;
859	pbArgs++;
860
861	/*
862	* Each feature but the last one are separated by ; and the last one is delimited by the # packet end symbol.
863	* We first determine the boundaries of the reported feature and pass it to the appropriate handler.
864	*/
865	int rc = VINF_SUCCESS;
866	while ( cbArgs
867	&& RT_SUCCESS(rc))
868	{
869	bool fTerminator = false;
870	size_t cbArg = 0;
871	rc = dbgcGdbStubCtxQueryPktQueryFeatureLen(pbArgs, cbArgs, &cbArg, &fTerminator);
872	if (RT_SUCCESS(rc))
873	{
874	/* Search for the feature handler. */
875	for (uint32_t i = 0; i < RT_ELEMENTS(g_aGdbFeatures); i++)
876	{
877	PCGDBSTUBFEATDESC pFeatDesc = &g_aGdbFeatures[i];
878
879	if ( cbArg > pFeatDesc->cchName /* At least one character must come after the feature name ('+', '-' or '='). */
880	&& !memcmp(pFeatDesc->pszName, pbArgs, pFeatDesc->cchName))
881	{
882	/* Found, execute handler after figuring out whether there is a value attached. */
883	const uint8_t *pbVal = pbArgs + pFeatDesc->cchName;
884	size_t cbVal = cbArg - pFeatDesc->cchName;
885
886	if (pFeatDesc->fVal)
887	{
888	if ( *pbVal == '='
889	&& cbVal > 1)
890	{
891	pbVal++;
892	cbVal--;
893	}
894	else
895	rc = VERR_NET_PROTOCOL_ERROR;
896	}
897	else if ( cbVal != 1
898	\|\| ( *pbVal != '+'
899	&& pbVal != '-')) / '+' and '-' are allowed to indicate support for a particular feature. */
900	rc = VERR_NET_PROTOCOL_ERROR;
901
902	if (RT_SUCCESS(rc))
903	rc = pFeatDesc->pfnHandler(pThis, pbVal, cbVal);
904	break;
905	}
906	}
907
908	cbArgs -= cbArg;
909	pbArgs += cbArg;
910	if (!fTerminator)
911	{
912	cbArgs--;
913	pbArgs++;
914	}
915	else
916	break;
917	}
918	}
919
920	/* If everything went alright send the reply with our supported features. */
921	if (RT_SUCCESS(rc))
922	rc = dbgcGdbStubCtxPktProcessQuerySupportedReply(pThis);
923
924	return rc;
925	}
926
927
928	/**
929	* Sends the reply to a 'qXfer:object:read:...' request.
930	*
931	* @returns Status code.
932	* @param pThis The GDB stub context.
933	* @param offRead Where to start reading from within the object.
934	* @param cbRead How much to read.
935	* @param pbObj The start of the object.
936	* @param cbObj Size of the object.
937	*/
938	static int dbgcGdbStubCtxQueryXferReadReply(PGDBSTUBCTX pThis, uint32_t offRead, size_t cbRead, const uint8_t *pbObj, size_t cbObj)
939	{
940	int rc = VINF_SUCCESS;
941	if (offRead < cbObj)
942	{
943	/** @todo Escaping */
944	size_t cbThisRead = offRead + cbRead < cbObj ? cbRead : cbObj - offRead;
945
946	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbThisRead + 1);
947	if (RT_SUCCESS(rc))
948	{
949	uint8_t *pbPktBuf = pThis->pbPktBuf;
950	*pbPktBuf++ = cbThisRead < cbRead ? 'l' : 'm';
951	memcpy(pbPktBuf, pbObj + offRead, cbThisRead);
952	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbThisRead + 1);
953	}
954	else
955	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NO_MEMORY);
956	}
957	else if (offRead == cbObj)
958	rc = dbgcGdbStubCtxReplySend(pThis, "l", sizeof("l") - 1);
959	else
960	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
961
962	return rc;
963	}
964
965
966	/**
967	* Parses the annex:offset,length part of a 'qXfer:object:read:...' request.
968	*
969	* @returns Status code.
970	* @param pbArgs Start of the arguments beginning with annex.
971	* @param cbArgs Number of bytes remaining for the arguments.
972	* @param ppchAnnex Where to store the pointer to the beginning of the annex on success.
973	* @param pcchAnnex Where to store the number of characters for the annex on success.
974	* @param poffRead Where to store the offset on success.
975	* @param pcbRead Where to store the length on success.
976	*/
977	static int dbgcGdbStubCtxPktProcessQueryXferParseAnnexOffLen(const uint8_t pbArgs, size_t cbArgs, const char ppchAnnex, size_t pcchAnnex,
978	uint32_t poffRead, size_t pcbRead)
979	{
980	int rc = VINF_SUCCESS;
981	const uint8_t pbSep = (const uint8_t )memchr(pbArgs, ':', cbArgs);
982	if (pbSep)
983	{
984	ppchAnnex = (const char )pbArgs;
985	*pcchAnnex = pbSep - pbArgs;
986
987	pbSep++;
988	cbArgs -= *pcchAnnex + 1;
989
990	uint64_t u64Tmp = 0;
991	const uint8_t *pbLenStart = NULL;
992	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbSep, cbArgs, &u64Tmp, ',', &pbLenStart);
993	if ( RT_SUCCESS(rc)
994	&& (uint32_t)u64Tmp == u64Tmp)
995	{
996	*poffRead = (uint32_t)u64Tmp;
997	cbArgs -= pbLenStart - pbSep;
998
999	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbLenStart + 1, cbArgs, &u64Tmp, '#', &pbLenStart);
1000	if ( RT_SUCCESS(rc)
1001	&& (size_t)u64Tmp == u64Tmp)
1002	*pcbRead = (size_t)u64Tmp;
1003	else
1004	rc = VERR_NET_PROTOCOL_ERROR;
1005	}
1006	else
1007	rc = VERR_NET_PROTOCOL_ERROR;
1008	}
1009	else
1010	rc = VERR_NET_PROTOCOL_ERROR;
1011
1012	return rc;
1013	}
1014
1015
1016	#define DBGREG_DESC_INIT_INT64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "int64", NULL }
1017	#define DBGREG_DESC_INIT_INT32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "int32", NULL }
1018	#define DBGREG_DESC_INIT_DATA_PTR64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "data_ptr", NULL }
1019	#define DBGREG_DESC_INIT_CODE_PTR64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "code_ptr", NULL }
1020	#define DBGREG_DESC_INIT_DATA_PTR32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "data_ptr", NULL }
1021	#define DBGREG_DESC_INIT_CODE_PTR32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "code_ptr", NULL }
1022	#define DBGREG_DESC_INIT_X87(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 80, "i387_ext", NULL }
1023	#define DBGREG_DESC_INIT_X87_CTRL(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "int", "float" }
1024
1025
1026	/**
1027	* amd64 GDB register set.
1028	*/
1029	static const GDBREGDESC g_aGdbRegs64[] =
1030	{
1031	DBGREG_DESC_INIT_INT64( "rax", DBGFREG_RAX),
1032	DBGREG_DESC_INIT_INT64( "rbx", DBGFREG_RBX),
1033	DBGREG_DESC_INIT_INT64( "rcx", DBGFREG_RCX),
1034	DBGREG_DESC_INIT_INT64( "rdx", DBGFREG_RDX),
1035	DBGREG_DESC_INIT_INT64( "rsi", DBGFREG_RSI),
1036	DBGREG_DESC_INIT_INT64( "rdi", DBGFREG_RDI),
1037	DBGREG_DESC_INIT_DATA_PTR64("rbp", DBGFREG_RBP),
1038	DBGREG_DESC_INIT_DATA_PTR64("rsp", DBGFREG_RSP),
1039	DBGREG_DESC_INIT_INT64( "r8", DBGFREG_R8),
1040	DBGREG_DESC_INIT_INT64( "r9", DBGFREG_R9),
1041	DBGREG_DESC_INIT_INT64( "r10", DBGFREG_R10),
1042	DBGREG_DESC_INIT_INT64( "r11", DBGFREG_R11),
1043	DBGREG_DESC_INIT_INT64( "r12", DBGFREG_R12),
1044	DBGREG_DESC_INIT_INT64( "r13", DBGFREG_R13),
1045	DBGREG_DESC_INIT_INT64( "r14", DBGFREG_R14),
1046	DBGREG_DESC_INIT_INT64( "r15", DBGFREG_R15),
1047	DBGREG_DESC_INIT_CODE_PTR64("rip", DBGFREG_RIP),
1048	DBGREG_DESC_INIT_INT32( "eflags", DBGFREG_FLAGS),
1049	DBGREG_DESC_INIT_INT32( "cs", DBGFREG_CS),
1050	DBGREG_DESC_INIT_INT32( "ss", DBGFREG_SS),
1051	DBGREG_DESC_INIT_INT32( "ds", DBGFREG_DS),
1052	DBGREG_DESC_INIT_INT32( "es", DBGFREG_ES),
1053	DBGREG_DESC_INIT_INT32( "fs", DBGFREG_FS),
1054	DBGREG_DESC_INIT_INT32( "gs", DBGFREG_GS),
1055
1056	DBGREG_DESC_INIT_X87( "st0", DBGFREG_ST0),
1057	DBGREG_DESC_INIT_X87( "st1", DBGFREG_ST1),
1058	DBGREG_DESC_INIT_X87( "st2", DBGFREG_ST2),
1059	DBGREG_DESC_INIT_X87( "st3", DBGFREG_ST3),
1060	DBGREG_DESC_INIT_X87( "st4", DBGFREG_ST4),
1061	DBGREG_DESC_INIT_X87( "st5", DBGFREG_ST5),
1062	DBGREG_DESC_INIT_X87( "st6", DBGFREG_ST6),
1063	DBGREG_DESC_INIT_X87( "st7", DBGFREG_ST7),
1064
1065	DBGREG_DESC_INIT_X87_CTRL( "fctrl", DBGFREG_FCW),
1066	DBGREG_DESC_INIT_X87_CTRL( "fstat", DBGFREG_FSW),
1067	DBGREG_DESC_INIT_X87_CTRL( "ftag", DBGFREG_FTW),
1068	DBGREG_DESC_INIT_X87_CTRL( "fop", DBGFREG_FOP),
1069	DBGREG_DESC_INIT_X87_CTRL( "fioff", DBGFREG_FPUIP),
1070	DBGREG_DESC_INIT_X87_CTRL( "fiseg", DBGFREG_FPUCS),
1071	DBGREG_DESC_INIT_X87_CTRL( "fooff", DBGFREG_FPUDP),
1072	DBGREG_DESC_INIT_X87_CTRL( "foseg", DBGFREG_FPUDS)
1073	};
1074
1075
1076	/**
1077	* i386 GDB register set.
1078	*/
1079	static const GDBREGDESC g_aGdbRegs32[] =
1080	{
1081	DBGREG_DESC_INIT_INT32( "eax", DBGFREG_EAX),
1082	DBGREG_DESC_INIT_INT32( "ebx", DBGFREG_EBX),
1083	DBGREG_DESC_INIT_INT32( "ecx", DBGFREG_ECX),
1084	DBGREG_DESC_INIT_INT32( "edx", DBGFREG_EDX),
1085	DBGREG_DESC_INIT_INT32( "esi", DBGFREG_ESI),
1086	DBGREG_DESC_INIT_INT32( "edi", DBGFREG_EDI),
1087	DBGREG_DESC_INIT_DATA_PTR32("ebp", DBGFREG_EBP),
1088	DBGREG_DESC_INIT_DATA_PTR32("esp", DBGFREG_ESP),
1089	DBGREG_DESC_INIT_CODE_PTR32("eip", DBGFREG_EIP),
1090	DBGREG_DESC_INIT_INT32( "eflags", DBGFREG_FLAGS),
1091	DBGREG_DESC_INIT_INT32( "cs", DBGFREG_CS),
1092	DBGREG_DESC_INIT_INT32( "ss", DBGFREG_SS),
1093	DBGREG_DESC_INIT_INT32( "ds", DBGFREG_DS),
1094	DBGREG_DESC_INIT_INT32( "es", DBGFREG_ES),
1095	DBGREG_DESC_INIT_INT32( "fs", DBGFREG_FS),
1096	DBGREG_DESC_INIT_INT32( "gs", DBGFREG_GS),
1097
1098	DBGREG_DESC_INIT_X87( "st0", DBGFREG_ST0),
1099	DBGREG_DESC_INIT_X87( "st1", DBGFREG_ST1),
1100	DBGREG_DESC_INIT_X87( "st2", DBGFREG_ST2),
1101	DBGREG_DESC_INIT_X87( "st3", DBGFREG_ST3),
1102	DBGREG_DESC_INIT_X87( "st4", DBGFREG_ST4),
1103	DBGREG_DESC_INIT_X87( "st5", DBGFREG_ST5),
1104	DBGREG_DESC_INIT_X87( "st6", DBGFREG_ST6),
1105	DBGREG_DESC_INIT_X87( "st7", DBGFREG_ST7),
1106
1107	DBGREG_DESC_INIT_X87_CTRL( "fctrl", DBGFREG_FCW),
1108	DBGREG_DESC_INIT_X87_CTRL( "fstat", DBGFREG_FSW),
1109	DBGREG_DESC_INIT_X87_CTRL( "ftag", DBGFREG_FTW),
1110	DBGREG_DESC_INIT_X87_CTRL( "fop", DBGFREG_FOP),
1111	DBGREG_DESC_INIT_X87_CTRL( "fioff", DBGFREG_FPUIP),
1112	DBGREG_DESC_INIT_X87_CTRL( "fiseg", DBGFREG_FPUCS),
1113	DBGREG_DESC_INIT_X87_CTRL( "fooff", DBGFREG_FPUDP),
1114	DBGREG_DESC_INIT_X87_CTRL( "foseg", DBGFREG_FPUDS)
1115	};
1116
1117	#undef DBGREG_DESC_INIT_CODE_PTR64
1118	#undef DBGREG_DESC_INIT_DATA_PTR64
1119	#undef DBGREG_DESC_INIT_CODE_PTR32
1120	#undef DBGREG_DESC_INIT_DATA_PTR32
1121	#undef DBGREG_DESC_INIT_INT32
1122	#undef DBGREG_DESC_INIT_INT64
1123	#undef DBGREG_DESC_INIT_X87
1124	#undef DBGREG_DESC_INIT_X87_CTRL
1125
1126
1127	/**
1128	* Creates the target XML description.
1129	*
1130	* @returns Status code.
1131	* @param pThis The GDB stub context.
1132	*/
1133	static int dbgcGdbStubCtxTgtXmlDescCreate(PGDBSTUBCTX pThis)
1134	{
1135	static const char s_szXmlTgtHdr64[] =
1136	"<?xml version=\"1.0\"?>\n"
1137	"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
1138	"<target version=\"1.0\">\n"
1139	" <architecture>i386:x86-64</architecture>\n"
1140	" <feature name=\"org.gnu.gdb.i386.core\">\n";
1141	static const char s_szXmlTgtHdr32[] =
1142	"<?xml version=\"1.0\"?>\n"
1143	"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
1144	"<target version=\"1.0\">\n"
1145	" <architecture>i386</architecture>\n"
1146	" <feature name=\"org.gnu.gdb.i386.core\">\n";
1147	static const char s_szXmlTgtFooter[] =
1148	" </feature>\n"
1149	"</target>\n";
1150
1151	int rc = VINF_SUCCESS;
1152
1153	pThis->pachTgtXmlDesc = (char *)RTStrAlloc(_32K);
1154	if (pThis->pachTgtXmlDesc)
1155	{
1156	size_t cbLeft = _32K;
1157	char *pachXmlCur = pThis->pachTgtXmlDesc;
1158	pThis->cbTgtXmlDesc = cbLeft;
1159
1160	rc = RTStrCatP(&pachXmlCur, &cbLeft, pThis->paRegs == &g_aGdbRegs64[0] ? &s_szXmlTgtHdr64[0] : &s_szXmlTgtHdr32[0]);
1161	if (RT_SUCCESS(rc))
1162	{
1163	/* Register */
1164	for (uint32_t i = 0; i < pThis->cRegs && RT_SUCCESS(rc); i++)
1165	{
1166	const struct GDBREGDESC *pReg = &pThis->paRegs[i];
1167
1168	ssize_t cchStr = 0;
1169	if (pReg->pszGroup)
1170	cchStr = RTStrPrintf2(pachXmlCur, cbLeft,
1171	"<reg name=\"%s\" bitsize=\"%u\" regnum=\"%u\" type=\"%s\" group=\"%s\"/>\n",
1172	pReg->pszName, pReg->cBits, i, pReg->pszType, pReg->pszGroup);
1173	else
1174	cchStr = RTStrPrintf2(pachXmlCur, cbLeft,
1175	"<reg name=\"%s\" bitsize=\"%u\" regnum=\"%u\" type=\"%s\"/>\n",
1176	pReg->pszName, pReg->cBits, i, pReg->pszType);
1177
1178	if (cchStr > 0)
1179	{
1180	pachXmlCur += cchStr;
1181	cbLeft -= cchStr;
1182	}
1183	else
1184	rc = VERR_BUFFER_OVERFLOW;
1185	}
1186	}
1187
1188	if (RT_SUCCESS(rc))
1189	rc = RTStrCatP(&pachXmlCur, &cbLeft, &s_szXmlTgtFooter[0]);
1190
1191	pThis->cbTgtXmlDesc -= cbLeft;
1192	}
1193	else
1194	rc = VERR_NO_MEMORY;
1195
1196	return rc;
1197	}
1198
1199
1200	/**
1201	* Returns the GDB register descriptor describing the given DBGF register enum.
1202	*
1203	* @returns Pointer to the GDB register descriptor or NULL if not found.
1204	* @param pThis The GDB stub context.
1205	* @param idxReg The register to look for.
1206	*/
1207	static const GDBREGDESC *dbgcGdbStubRegGet(PGDBSTUBCTX pThis, uint32_t idxReg)
1208	{
1209	if (RT_LIKELY(idxReg < pThis->cRegs))
1210	return &pThis->paRegs[idxReg];
1211
1212	return NULL;
1213	}
1214
1215
1216	/**
1217	* Processes the 'C' query (query current thread ID).
1218	*
1219	* @returns Status code.
1220	* @param pThis The GDB stub context.
1221	* @param pbArgs Pointer to the start of the arguments in the packet.
1222	* @param cbArgs Size of arguments in bytes.
1223	*/
1224	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadId(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1225	{
1226	RT_NOREF(pbArgs, cbArgs);
1227
1228	int rc = VERR_BUFFER_OVERFLOW;
1229	char achReply[32];
1230	ssize_t cchStr = RTStrPrintf(&achReply[0], sizeof(achReply), "QC %02x", pThis->Dbgc.idCpu + 1);
1231	if (cchStr > 0)
1232	rc = dbgcGdbStubCtxReplySend(pThis, &achReply[0], cchStr);
1233
1234	return rc;
1235	}
1236
1237
1238	/**
1239	* Processes the 'Attached' query.
1240	*
1241	* @returns Status code.
1242	* @param pThis The GDB stub context.
1243	* @param pbArgs Pointer to the start of the arguments in the packet.
1244	* @param cbArgs Size of arguments in bytes.
1245	*/
1246	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryAttached(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1247	{
1248	RT_NOREF(pbArgs, cbArgs);
1249
1250	/* We always report attached so that the VM doesn't get killed when GDB quits. */
1251	uint8_t bAttached = '1';
1252	return dbgcGdbStubCtxReplySend(pThis, &bAttached, sizeof(bAttached));
1253	}
1254
1255
1256	/**
1257	* Processes the 'Xfer:features:read' query.
1258	*
1259	* @returns Status code.
1260	* @param pThis The GDB stub context.
1261	* @param pbArgs Pointer to the start of the arguments in the packet.
1262	* @param cbArgs Size of arguments in bytes.
1263	*/
1264	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryXferFeatRead(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1265	{
1266	/* Skip the : following the Xfer:features:read start. */
1267	if ( cbArgs < 1
1268	\|\| pbArgs[0] != ':')
1269	return VERR_NET_PROTOCOL_ERROR;
1270
1271	cbArgs--;
1272	pbArgs++;
1273
1274	int rc = VINF_SUCCESS;
1275	if (pThis->fFeatures & GDBSTUBCTX_FEATURES_F_TGT_DESC)
1276	{
1277	/* Create the target XML description if not existing. */
1278	if (!pThis->pachTgtXmlDesc)
1279	rc = dbgcGdbStubCtxTgtXmlDescCreate(pThis);
1280
1281	if (RT_SUCCESS(rc))
1282	{
1283	/* Parse annex, offset and length and return the data. */
1284	const char *pchAnnex = NULL;
1285	size_t cchAnnex = 0;
1286	uint32_t offRead = 0;
1287	size_t cbRead = 0;
1288
1289	rc = dbgcGdbStubCtxPktProcessQueryXferParseAnnexOffLen(pbArgs, cbArgs,
1290	&pchAnnex, &cchAnnex,
1291	&offRead, &cbRead);
1292	if (RT_SUCCESS(rc))
1293	{
1294	/* Check whether the annex is supported. */
1295	if ( cchAnnex == sizeof("target.xml") - 1
1296	&& !memcmp(pchAnnex, "target.xml", cchAnnex))
1297	rc = dbgcGdbStubCtxQueryXferReadReply(pThis, offRead, cbRead, (const uint8_t *)pThis->pachTgtXmlDesc,
1298	pThis->cbTgtXmlDesc);
1299	else
1300	rc = dbgcGdbStubCtxReplySendErr(pThis, 0);
1301	}
1302	else
1303	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1304	}
1305	else
1306	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1307	}
1308	else
1309	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0); /* Not supported. */
1310
1311	return rc;
1312	}
1313
1314
1315	/**
1316	* Processes the 'Rcmd' query.
1317	*
1318	* @returns Status code.
1319	* @param pThis The GDB stub context.
1320	* @param pbArgs Pointer to the start of the arguments in the packet.
1321	* @param cbArgs Size of arguments in bytes.
1322	*/
1323	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryRcmd(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1324	{
1325	/* Skip the , following the qRcmd start. */
1326	if ( cbArgs < 1
1327	\|\| pbArgs[0] != ',')
1328	return VERR_NET_PROTOCOL_ERROR;
1329
1330	cbArgs--;
1331	pbArgs++;
1332
1333	/* Decode the command. */
1334	/** @todo Make this dynamic. */
1335	char szCmd[_4K];
1336	RT_ZERO(szCmd);
1337
1338	if (cbArgs / 2 >= sizeof(szCmd))
1339	return VERR_NET_PROTOCOL_ERROR;
1340
1341	size_t cbDecoded = 0;
1342	int rc = RTStrConvertHexBytesEx((const char )pbArgs, &szCmd[0], sizeof(szCmd), 0 /fFlags*/,
1343	NULL /* ppszNext */, &cbDecoded);
1344	if (rc == VWRN_TRAILING_CHARS)
1345	rc = VINF_SUCCESS;
1346	if (RT_SUCCESS(rc))
1347	{
1348	szCmd[cbDecoded] = '\0'; /* Ensure zero termination. */
1349
1350	pThis->fOutput = false;
1351	rc = dbgcEvalCommand(&pThis->Dbgc, &szCmd[0], cbDecoded - 1, false /fNoExecute/);
1352	dbgcGdbStubCtxReplySendOk(pThis);
1353	if ( rc != VERR_DBGC_QUIT
1354	&& rc != VWRN_DBGC_CMD_PENDING)
1355	rc = VINF_SUCCESS; /* ignore other statuses */
1356	}
1357
1358	return rc;
1359	}
1360
1361
1362	/**
1363	* Worker for both 'qfThreadInfo' and 'qsThreadInfo'.
1364	*
1365	* @returns VBox status code.
1366	* @param pThis The GDB stub context.
1367	*/
1368	static int dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(PGDBSTUBCTX pThis)
1369	{
1370	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
1371	if (RT_SUCCESS(rc))
1372	{
1373	uint8_t bReplyStart = { 'm' };
1374	rc = dbgcGdbStubCtxReplySendData(pThis, &bReplyStart, sizeof(bReplyStart));
1375	if (RT_SUCCESS(rc))
1376	{
1377	char achReply[32];
1378	ssize_t cchStr = RTStrPrintf(&achReply[0], sizeof(achReply), "%02x", pThis->idCpuNextThrdInfoQuery + 1);
1379	if (cchStr <= 0)
1380	rc = VERR_BUFFER_OVERFLOW;
1381
1382	if (RT_SUCCESS(rc))
1383	rc = dbgcGdbStubCtxReplySendData(pThis, &achReply[0], cchStr);
1384	if (RT_SUCCESS(rc))
1385	rc = dbgcGdbStubCtxReplySendEnd(pThis);
1386	pThis->idCpuNextThrdInfoQuery++;
1387	}
1388	}
1389
1390	return rc;
1391	}
1392
1393
1394	/**
1395	* Processes the 'fThreadInfo' query.
1396	*
1397	* @returns Status code.
1398	* @param pThis The GDB stub context.
1399	* @param pbArgs Pointer to the start of the arguments in the packet.
1400	* @param cbArgs Size of arguments in bytes.
1401	*/
1402	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadInfoStart(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1403	{
1404	RT_NOREF(pbArgs, cbArgs);
1405
1406	pThis->idCpuNextThrdInfoQuery = 0;
1407	pThis->fInThrdInfoQuery = true;
1408	return dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(pThis);
1409	}
1410
1411
1412	/**
1413	* Processes the 'fThreadInfo' query.
1414	*
1415	* @returns Status code.
1416	* @param pThis The GDB stub context.
1417	* @param pbArgs Pointer to the start of the arguments in the packet.
1418	* @param cbArgs Size of arguments in bytes.
1419	*/
1420	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadInfoCont(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1421	{
1422	RT_NOREF(pbArgs, cbArgs);
1423
1424	/* If we are in a thread info query we just send the end of list specifier (all thread IDs where sent previously already). */
1425	if (!pThis->fInThrdInfoQuery)
1426	return dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1427
1428	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1429	if (pThis->idCpuNextThrdInfoQuery == cCpus)
1430	{
1431	pThis->fInThrdInfoQuery = false;
1432	uint8_t bEoL = 'l';
1433	return dbgcGdbStubCtxReplySend(pThis, &bEoL, sizeof(bEoL));
1434	}
1435
1436	return dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(pThis);
1437	}
1438
1439
1440	/**
1441	* Processes the 'ThreadExtraInfo' query.
1442	*
1443	* @returns Status code.
1444	* @param pThis The GDB stub context.
1445	* @param pbArgs Pointer to the start of the arguments in the packet.
1446	* @param cbArgs Size of arguments in bytes.
1447	*/
1448	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadExtraInfo(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1449	{
1450	/* Skip the , following the qThreadExtraInfo start. */
1451	if ( cbArgs < 1
1452	\|\| pbArgs[0] != ',')
1453	return VERR_NET_PROTOCOL_ERROR;
1454
1455	/cbArgs--;/ /* Not used */
1456	pbArgs++;
1457
1458	/* We know there is an # character denoting the end so the following must return with VWRN_TRAILING_CHARS. */
1459	VMCPUID idCpu;
1460	int rc = RTStrToUInt32Ex((const char )pbArgs, NULL /ppszNext*/, 16, &idCpu);
1461	if ( rc == VWRN_TRAILING_CHARS
1462	&& idCpu > 0)
1463	{
1464	idCpu--;
1465
1466	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1467	if (idCpu < cCpus)
1468	{
1469	const char *pszCpuState = DBGFR3CpuGetState(pThis->Dbgc.pUVM, idCpu);
1470	size_t cchCpuState = strlen(pszCpuState);
1471
1472	if (!pszCpuState)
1473	pszCpuState = "DBGFR3CpuGetState() -> NULL";
1474
1475	rc = dbgcGdbStubCtxReplySendBegin(pThis);
1476	if (RT_SUCCESS(rc))
1477	{
1478	/* Convert the characters to hex. */
1479	const char *pachCur = pszCpuState;
1480
1481	while ( cchCpuState
1482	&& RT_SUCCESS(rc))
1483	{
1484	uint8_t achHex[512 + 1];
1485	size_t cbThisSend = RT_MIN((sizeof(achHex) - 1) / 2, cchCpuState); /* Each character needs two bytes. */
1486
1487	rc = dbgcGdbStubCtxEncodeBinaryAsHex(&achHex[0], cbThisSend * 2 + 1, pachCur, cbThisSend);
1488	if (RT_SUCCESS(rc))
1489	rc = dbgcGdbStubCtxReplySendData(pThis, &achHex[0], cbThisSend * 2);
1490
1491	pachCur += cbThisSend;
1492	cchCpuState -= cbThisSend;
1493	}
1494
1495	dbgcGdbStubCtxReplySendEnd(pThis);
1496	}
1497	}
1498	else
1499	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1500	}
1501	else if ( RT_SUCCESS(rc)
1502	\|\| !idCpu)
1503	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1504
1505	return rc;
1506	}
1507
1508
1509	/**
1510	* List of supported query packets.
1511	*/
1512	static const GDBSTUBQPKTPROC g_aQPktProcs[] =
1513	{
1514	#define GDBSTUBQPKTPROC_INIT(a_Name, a_pfnProc) { a_Name, sizeof(a_Name) - 1, a_pfnProc }
1515	GDBSTUBQPKTPROC_INIT("C", dbgcGdbStubCtxPktProcessQueryThreadId),
1516	GDBSTUBQPKTPROC_INIT("Attached", dbgcGdbStubCtxPktProcessQueryAttached),
1517	GDBSTUBQPKTPROC_INIT("TStatus", dbgcGdbStubCtxPktProcessQueryTStatus),
1518	GDBSTUBQPKTPROC_INIT("Supported", dbgcGdbStubCtxPktProcessQuerySupported),
1519	GDBSTUBQPKTPROC_INIT("Xfer:features:read", dbgcGdbStubCtxPktProcessQueryXferFeatRead),
1520	GDBSTUBQPKTPROC_INIT("Rcmd", dbgcGdbStubCtxPktProcessQueryRcmd),
1521	GDBSTUBQPKTPROC_INIT("fThreadInfo", dbgcGdbStubCtxPktProcessQueryThreadInfoStart),
1522	GDBSTUBQPKTPROC_INIT("sThreadInfo", dbgcGdbStubCtxPktProcessQueryThreadInfoCont),
1523	GDBSTUBQPKTPROC_INIT("ThreadExtraInfo", dbgcGdbStubCtxPktProcessQueryThreadExtraInfo),
1524	#undef GDBSTUBQPKTPROC_INIT
1525	};
1526
1527
1528	/**
1529	* Processes a 'q' packet, sending the appropriate reply.
1530	*
1531	* @returns Status code.
1532	* @param pThis The GDB stub context.
1533	* @param pbQuery The query packet data (without the 'q').
1534	* @param cbQuery Size of the remaining query packet in bytes.
1535	*/
1536	static int dbgcGdbStubCtxPktProcessQuery(PGDBSTUBCTX pThis, const uint8_t *pbQuery, size_t cbQuery)
1537	{
1538	/* Search the query and execute the processor or return an empty reply if not supported. */
1539	for (uint32_t i = 0; i < RT_ELEMENTS(g_aQPktProcs); i++)
1540	{
1541	size_t cbCmp = g_aQPktProcs[i].cchName < cbQuery ? g_aQPktProcs[i].cchName : cbQuery;
1542
1543	if (!memcmp(pbQuery, g_aQPktProcs[i].pszName, cbCmp))
1544	return g_aQPktProcs[i].pfnProc(pThis, pbQuery + cbCmp, cbQuery - cbCmp);
1545	}
1546
1547	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1548	}
1549
1550
1551	/**
1552	* Processes a 'vCont[;action[:thread-id]]' packet.
1553	*
1554	* @returns Status code.
1555	* @param pThis The GDB stub context.
1556	* @param pbArgs Pointer to the start of the arguments in the packet.
1557	* @param cbArgs Size of arguments in bytes.
1558	*/
1559	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessVCont(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1560	{
1561	int rc = VINF_SUCCESS;
1562
1563	/* Skip the ; following the identifier. */
1564	if ( cbArgs < 2
1565	\|\| pbArgs[0] != ';')
1566	return dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1567
1568	pbArgs++;
1569	/cbArgs--;/ /* Not used */
1570
1571	/** @todo For now we don't care about multiple threads and ignore thread IDs and multiple actions. */
1572	switch (pbArgs[0])
1573	{
1574	case 'c':
1575	{
1576	if (DBGFR3IsHalted(pThis->Dbgc.pUVM, VMCPUID_ALL))
1577	DBGFR3Resume(pThis->Dbgc.pUVM, VMCPUID_ALL);
1578	break;
1579	}
1580	case 's':
1581	{
1582	PDBGFADDRESS pStackPop = NULL;
1583	RTGCPTR cbStackPop = 0;
1584	rc = DBGFR3StepEx(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, DBGF_STEP_F_INTO, NULL,
1585	pStackPop, cbStackPop, 1 /cMaxSteps/);
1586	if (RT_FAILURE(rc))
1587	dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1588	break;
1589	}
1590	case 't':
1591	{
1592	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM, VMCPUID_ALL))
1593	rc = DBGFR3Halt(pThis->Dbgc.pUVM, VMCPUID_ALL);
1594	/* The reply will be send in the event loop. */
1595	break;
1596	}
1597	default:
1598	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1599	}
1600
1601	return rc;
1602	}
1603
1604
1605	/**
1606	* List of supported 'v<identifier>' packets.
1607	*/
1608	static const GDBSTUBVPKTPROC g_aVPktProcs[] =
1609	{
1610	#define GDBSTUBVPKTPROC_INIT(a_Name, a_pszReply, a_pfnProc) { a_Name, sizeof(a_Name) - 1, a_pszReply, sizeof(a_pszReply) - 1, a_pfnProc }
1611	GDBSTUBVPKTPROC_INIT("Cont", "vCont;s;c;t", dbgcGdbStubCtxPktProcessVCont)
1612	#undef GDBSTUBVPKTPROC_INIT
1613	};
1614
1615
1616	/**
1617	* Processes a 'v<identifier>' packet, sending the appropriate reply.
1618	*
1619	* @returns Status code.
1620	* @param pThis The GDB stub context.
1621	* @param pbPktRem The remaining packet data (without the 'v').
1622	* @param cbPktRem Size of the remaining packet in bytes.
1623	*/
1624	static int dbgcGdbStubCtxPktProcessV(PGDBSTUBCTX pThis, const uint8_t *pbPktRem, size_t cbPktRem)
1625	{
1626	/* Determine the end of the identifier, delimiters are '?', ';' or end of packet. */
1627	bool fQuery = false;
1628	const uint8_t pbDelim = (const uint8_t )memchr(pbPktRem, '?', cbPktRem);
1629	if (!pbDelim)
1630	pbDelim = (const uint8_t *)memchr(pbPktRem, ';', cbPktRem);
1631	else
1632	fQuery = true;
1633
1634	size_t cchId = 0;
1635	if (pbDelim) /* Delimiter found, calculate length. */
1636	cchId = pbDelim - pbPktRem;
1637	else /* Not found, size goes till end of packet. */
1638	cchId = cbPktRem;
1639
1640	/* Search the query and execute the processor or return an empty reply if not supported. */
1641	for (uint32_t i = 0; i < RT_ELEMENTS(g_aVPktProcs); i++)
1642	{
1643	PCGDBSTUBVPKTPROC pVProc = &g_aVPktProcs[i];
1644
1645	if ( pVProc->cchName == cchId
1646	&& !memcmp(pbPktRem, pVProc->pszName, cchId))
1647	{
1648	/* Just send the static reply for a query and execute the processor for everything else. */
1649	if (fQuery)
1650	return dbgcGdbStubCtxReplySend(pThis, pVProc->pszReplyQ, pVProc->cchReplyQ);
1651
1652	/* Execute the handler. */
1653	return pVProc->pfnProc(pThis, pbPktRem + cchId, cbPktRem - cchId);
1654	}
1655	}
1656
1657	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1658	}
1659
1660
1661	/**
1662	* Processes a 'H<op><thread-id>' packet, sending the appropriate reply.
1663	*
1664	* @returns Status code.
1665	* @param pThis The GDB stub context.
1666	* @param pbPktRem The remaining packet data (without the 'H').
1667	* @param cbPktRem Size of the remaining packet in bytes.
1668	*/
1669	static int dbgcGdbStubCtxPktProcessH(PGDBSTUBCTX pThis, const uint8_t *pbPktRem, size_t cbPktRem)
1670	{
1671	int rc = VINF_SUCCESS;
1672
1673	if (*pbPktRem == 'g')
1674	{
1675	/Unused: cbPktRem--;/ RT_NOREF(cbPktRem);
1676	pbPktRem++;
1677
1678	/* We know there is an # character denoting the end so the following must return with VWRN_TRAILING_CHARS. */
1679	VMCPUID idCpu;
1680	rc = RTStrToUInt32Ex((const char )pbPktRem, NULL /ppszNext*/, 16, &idCpu);
1681	if ( rc == VWRN_TRAILING_CHARS
1682	&& idCpu > 0)
1683	{
1684	idCpu--;
1685
1686	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1687	if (idCpu < cCpus)
1688	{
1689	pThis->Dbgc.idCpu = idCpu;
1690	rc = dbgcGdbStubCtxReplySendOk(pThis);
1691	}
1692	else
1693	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1694	}
1695	else
1696	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1697	}
1698	else /* Do not support the 'c' operation for now (will be handled through vCont later on anyway). */
1699	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1700
1701	return rc;
1702	}
1703
1704
1705	/**
1706	* Processes a completely received packet.
1707	*
1708	* @returns Status code.
1709	* @param pThis The GDB stub context.
1710	*/
1711	static int dbgcGdbStubCtxPktProcess(PGDBSTUBCTX pThis)
1712	{
1713	int rc = VINF_SUCCESS;
1714
1715	if (pThis->cbPkt >= 1)
1716	{
1717	switch (pThis->pbPktBuf[1])
1718	{
1719	case '!': /* Enabled extended mode. */
1720	{
1721	pThis->fExtendedMode = true;
1722	rc = dbgcGdbStubCtxReplySendOk(pThis);
1723	break;
1724	}
1725	case '?':
1726	{
1727	/* Return signal state. */
1728	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
1729	break;
1730	}
1731	case 's': /* Single step, response will be sent in the event loop. */
1732	{
1733	PDBGFADDRESS pStackPop = NULL;
1734	RTGCPTR cbStackPop = 0;
1735	rc = DBGFR3StepEx(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, DBGF_STEP_F_INTO, NULL,
1736	pStackPop, cbStackPop, 1 /cMaxSteps/);
1737	if (RT_FAILURE(rc))
1738	dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1739	break;
1740	}
1741	case 'c': /* Continue, no response */
1742	{
1743	if (DBGFR3IsHalted(pThis->Dbgc.pUVM, VMCPUID_ALL))
1744	DBGFR3Resume(pThis->Dbgc.pUVM, VMCPUID_ALL);
1745	break;
1746	}
1747	case 'H':
1748	{
1749	rc = dbgcGdbStubCtxPktProcessH(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
1750	break;
1751	}
1752	case 'T':
1753	{
1754	rc = dbgcGdbStubCtxReplySendOk(pThis);
1755	break;
1756	}
1757	case 'g': /* Read general registers. */
1758	{
1759	uint32_t idxRegMax = 0;
1760	size_t cbRegs = 0;
1761	for (;;)
1762	{
1763	const GDBREGDESC *pReg = &pThis->paRegs[idxRegMax++];
1764	cbRegs += pReg->cBits / 8;
1765	if (pReg->enmReg == DBGFREG_SS) /* Up to this seems to belong to the general register set. */
1766	break;
1767	}
1768
1769	size_t cbReplyPkt = cbRegs * 2 + 1; /* One byte needs two characters. */
1770	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1771	if (RT_SUCCESS(rc))
1772	{
1773	size_t cbLeft = cbReplyPkt;
1774	uint8_t *pbReply = pThis->pbPktBuf;
1775
1776	for (uint32_t i = 0; i < idxRegMax && RT_SUCCESS(rc); i++)
1777	{
1778	const GDBREGDESC *pReg = &pThis->paRegs[i];
1779	size_t cbReg = pReg->cBits / 8;
1780	union
1781	{
1782	uint32_t u32;
1783	uint64_t u64;
1784	uint8_t au8[8];
1785	} RegVal;
1786
1787	if (pReg->cBits == 32)
1788	rc = DBGFR3RegCpuQueryU32(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->enmReg, &RegVal.u32);
1789	else
1790	rc = DBGFR3RegCpuQueryU64(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->enmReg, &RegVal.u64);
1791
1792	if (RT_SUCCESS(rc))
1793	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pbReply, cbLeft, &RegVal.au8[0], cbReg);
1794
1795	pbReply += cbReg * 2;
1796	cbLeft -= cbReg * 2;
1797	}
1798
1799	if (RT_SUCCESS(rc))
1800	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1801	else
1802	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1803	}
1804
1805	break;
1806	}
1807	case 'm': /* Read memory. */
1808	{
1809	uint64_t GdbTgtAddr = 0;
1810	const uint8_t *pbPktSep = NULL;
1811
1812	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &GdbTgtAddr,
1813	',', &pbPktSep);
1814	if (RT_SUCCESS(rc))
1815	{
1816	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1817	uint64_t cbRead = 0;
1818	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &cbRead, GDBSTUB_PKT_END, NULL);
1819	if (RT_SUCCESS(rc))
1820	{
1821	size_t cbReplyPkt = cbRead * 2 + 1; /* One byte needs two characters. */
1822
1823	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1824	if (RT_SUCCESS(rc))
1825	{
1826	uint8_t *pbPktBuf = pThis->pbPktBuf;
1827	size_t cbPktBufLeft = cbReplyPkt;
1828	DBGFADDRESS AddrRead;
1829
1830	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &AddrRead, GdbTgtAddr);
1831
1832	while ( cbRead
1833	&& RT_SUCCESS(rc))
1834	{
1835	uint8_t abTmp[_4K];
1836	size_t cbThisRead = RT_MIN(cbRead, sizeof(abTmp));
1837
1838	rc = DBGFR3MemRead(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &AddrRead, &abTmp[0], cbThisRead);
1839	if (RT_FAILURE(rc))
1840	break;
1841
1842	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pbPktBuf, cbPktBufLeft, &abTmp[0], cbThisRead);
1843	if (RT_FAILURE(rc))
1844	break;
1845
1846	DBGFR3AddrAdd(&AddrRead, cbThisRead);
1847	cbRead -= cbThisRead;
1848	pbPktBuf += cbThisRead;
1849	cbPktBufLeft -= cbThisRead;
1850	}
1851
1852	if (RT_SUCCESS(rc))
1853	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1854	else
1855	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1856	}
1857	else
1858	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1859	}
1860	else
1861	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1862	}
1863	else
1864	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1865	break;
1866	}
1867	case 'M': /* Write memory. */
1868	{
1869	uint64_t GdbTgtAddr = 0;
1870	const uint8_t *pbPktSep = NULL;
1871
1872	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &GdbTgtAddr,
1873	',', &pbPktSep);
1874	if (RT_SUCCESS(rc))
1875	{
1876	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1877	uint64_t cbWrite = 0;
1878	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &cbWrite, ':', &pbPktSep);
1879	if (RT_SUCCESS(rc))
1880	{
1881	cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1882	const uint8_t *pbDataCur = pbPktSep + 1;
1883	size_t cbDataLeft = pThis->cbPkt - 1 - cbProcessed - 1 - 1;
1884	DBGFADDRESS AddrWrite;
1885
1886	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &AddrWrite, GdbTgtAddr);
1887
1888	while ( cbWrite
1889	&& RT_SUCCESS(rc))
1890	{
1891	uint8_t abTmp[_4K];
1892	size_t cbThisWrite = RT_MIN(cbWrite, sizeof(abTmp));
1893	size_t cbDecoded = 0;
1894
1895	rc = dbgcGdbStubCtxParseHexStringAsByteBuf(pbDataCur, cbDataLeft, &abTmp[0], cbThisWrite, &cbDecoded);
1896	if (!rc)
1897	rc = DBGFR3MemWrite(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &AddrWrite, &abTmp[0], cbThisWrite);
1898
1899	DBGFR3AddrAdd(&AddrWrite, cbThisWrite);
1900	cbWrite -= cbThisWrite;
1901	pbDataCur += cbDecoded;
1902	cbDataLeft -= cbDecoded;
1903	}
1904
1905	if (RT_SUCCESS(rc))
1906	rc = dbgcGdbStubCtxReplySendOk(pThis);
1907	else
1908	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1909	}
1910	else
1911	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1912	}
1913	else
1914	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1915	break;
1916	}
1917	case 'p': /* Read a single register */
1918	{
1919	uint64_t uReg = 0;
1920	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &uReg,
1921	GDBSTUB_PKT_END, NULL);
1922	if (RT_SUCCESS(rc))
1923	{
1924	DBGFREGVAL RegVal;
1925	DBGFREGVALTYPE enmType;
1926	const GDBREGDESC *pReg = dbgcGdbStubRegGet(pThis, uReg);
1927	if (RT_LIKELY(pReg))
1928	{
1929	rc = DBGFR3RegNmQuery(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->pszName, &RegVal, &enmType);
1930	if (RT_SUCCESS(rc))
1931	{
1932	size_t cbReg = pReg->cBits / 8;
1933	size_t cbReplyPkt = cbReg * 2 + 1; /* One byte needs two characters. */
1934
1935	/* Encode data and send. */
1936	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1937	if (RT_SUCCESS(rc))
1938	{
1939	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pThis->pbPktBuf, pThis->cbPktBufMax, &RegVal.au8[0], cbReg);
1940	if (RT_SUCCESS(rc))
1941	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1942	else
1943	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1944	}
1945	else
1946	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1947	}
1948	else
1949	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1950	}
1951	else
1952	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1953	}
1954	else
1955	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1956	break;
1957	}
1958	case 'P': /* Write a single register */
1959	{
1960	uint64_t uReg = 0;
1961	const uint8_t *pbPktSep = NULL;
1962	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &uReg,
1963	'=', &pbPktSep);
1964	if (RT_SUCCESS(rc))
1965	{
1966	const GDBREGDESC *pReg = dbgcGdbStubRegGet(pThis, uReg);
1967
1968	if (pReg)
1969	{
1970	DBGFREGVAL RegVal;
1971	DBGFREGVALTYPE enmValType = pReg->cBits == 64 ? DBGFREGVALTYPE_U64 : DBGFREGVALTYPE_U32;
1972	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1973	rc = dbgcGdbStubCtxParseHexStringAsByteBuf(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &RegVal.au8[0], pReg->cBits / 8, NULL);
1974	if (RT_SUCCESS(rc))
1975	{
1976	rc = DBGFR3RegNmSet(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->pszName, &RegVal, enmValType);
1977	if (RT_SUCCESS(rc))
1978	rc = dbgcGdbStubCtxReplySendOk(pThis);
1979	else
1980	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1981	}
1982	}
1983	else
1984	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1985	}
1986	else
1987	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1988	break;
1989	}
1990	case 'Z': /* Insert a breakpoint/watchpoint. */
1991	{
1992	GDBSTUBTPTYPE enmTpType = GDBSTUBTPTYPE_INVALID;
1993	uint64_t GdbTgtTpAddr = 0;
1994	uint64_t uKind = 0;
1995
1996	rc = dbgcGdbStubCtxParseTpPktArgs(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &enmTpType, &GdbTgtTpAddr, &uKind);
1997	if (RT_SUCCESS(rc))
1998	{
1999	uint32_t iBp = 0;
2000	DBGFADDRESS BpAddr;
2001	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &BpAddr, GdbTgtTpAddr);
2002
2003	switch (enmTpType)
2004	{
2005	case GDBSTUBTPTYPE_EXEC_SW:
2006	{
2007	rc = DBGFR3BpSetInt3(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &BpAddr,
2008	1 /iHitTrigger/, UINT64_MAX /iHitDisable/, &iBp);
2009	break;
2010	}
2011	case GDBSTUBTPTYPE_EXEC_HW:
2012	{
2013	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2014	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2015	X86_DR7_RW_EO, 1 /cb/, &iBp);
2016	break;
2017	}
2018	case GDBSTUBTPTYPE_MEM_ACCESS:
2019	case GDBSTUBTPTYPE_MEM_READ:
2020	{
2021	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2022	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2023	X86_DR7_RW_RW, uKind /cb/, &iBp);
2024	break;
2025	}
2026	case GDBSTUBTPTYPE_MEM_WRITE:
2027	{
2028	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2029	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2030	X86_DR7_RW_WO, uKind /cb/, &iBp);
2031	break;
2032	}
2033	default:
2034	AssertMsgFailed(("Invalid trace point type %d\n", enmTpType));
2035	}
2036
2037	if (RT_SUCCESS(rc))
2038	{
2039	rc = dbgcBpAdd(&pThis->Dbgc, iBp, NULL /pszCmd/);
2040	if (RT_SUCCESS(rc))
2041	{
2042	rc = dbgcGdbStubTpRegister(pThis, enmTpType, GdbTgtTpAddr, uKind, iBp);
2043	if (RT_SUCCESS(rc))
2044	rc = dbgcGdbStubCtxReplySendOk(pThis);
2045	else
2046	dbgcBpDelete(&pThis->Dbgc, iBp);
2047	}
2048
2049	if (RT_FAILURE(rc))
2050	{
2051	DBGFR3BpClear(pThis->Dbgc.pUVM, iBp);
2052	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2053	}
2054	}
2055	else
2056	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2057	}
2058	else
2059	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2060	break;
2061	}
2062	case 'z': /* Remove a breakpoint/watchpoint. */
2063	{
2064	GDBSTUBTPTYPE enmTpType = GDBSTUBTPTYPE_INVALID;
2065	uint64_t GdbTgtTpAddr = 0;
2066	uint64_t uKind = 0;
2067
2068	rc = dbgcGdbStubCtxParseTpPktArgs(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &enmTpType, &GdbTgtTpAddr, &uKind);
2069	if (RT_SUCCESS(rc))
2070	{
2071	PGDBSTUBTP pTp = dbgcGdbStubTpFind(pThis, enmTpType, GdbTgtTpAddr, uKind);
2072	if (pTp)
2073	{
2074	int rc2 = DBGFR3BpClear(pThis->Dbgc.pUVM, pTp->iBp);
2075	if (RT_SUCCESS(rc2) \|\| rc2 == VERR_DBGF_BP_NOT_FOUND)
2076	dbgcBpDelete(&pThis->Dbgc, pTp->iBp);
2077
2078	if (RT_SUCCESS(rc2))
2079	{
2080	dbgcGdbStubTpDeregister(pTp);
2081	rc = dbgcGdbStubCtxReplySendOk(pThis);
2082	}
2083	else
2084	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2085	}
2086	else
2087	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NOT_FOUND);
2088	}
2089	else
2090	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2091	break;
2092	}
2093	case 'q': /* Query packet */
2094	{
2095	rc = dbgcGdbStubCtxPktProcessQuery(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
2096	break;
2097	}
2098	case 'v': /* Multiletter identifier (verbose?) */
2099	{
2100	rc = dbgcGdbStubCtxPktProcessV(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
2101	break;
2102	}
2103	case 'R': /* Restart target. */
2104	{
2105	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
2106	break;
2107	}
2108	case 'k': /* Kill target. */
2109	{
2110	/* This is what the 'harakiri' command is doing. */
2111	for (;;)
2112	exit(126);
2113	break;
2114	}
2115	case 'D': /* Detach */
2116	{
2117	rc = dbgcGdbStubCtxReplySendOk(pThis);
2118	if (RT_SUCCESS(rc))
2119	rc = VERR_DBGC_QUIT;
2120	break;
2121	}
2122	default:
2123	/* Not supported, send empty reply. */
2124	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
2125	}
2126	}
2127
2128	return rc;
2129	}
2130
2131
2132	/**
2133	* Resets the packet buffer.
2134	*
2135	* @param pThis The GDB stub context.
2136	*/
2137	static void dbgcGdbStubCtxPktBufReset(PGDBSTUBCTX pThis)
2138	{
2139	pThis->offPktBuf = 0;
2140	pThis->cbPkt = 0;
2141	pThis->cbChksumRecvLeft = 2;
2142	}
2143
2144
2145	/**
2146	* Resets the given GDB stub context to the initial state.
2147	*
2148	* @param pThis The GDB stub context.
2149	*/
2150	static void dbgcGdbStubCtxReset(PGDBSTUBCTX pThis)
2151	{
2152	pThis->enmState = GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START;
2153	dbgcGdbStubCtxPktBufReset(pThis);
2154	}
2155
2156
2157	/**
2158	* Searches for the start character in the current data buffer.
2159	*
2160	* @returns Status code.
2161	* @param pThis The GDB stub context.
2162	* @param cbData Number of new bytes in the packet buffer.
2163	* @param pcbProcessed Where to store the amount of bytes processed.
2164	*/
2165	static int dbgcGdbStubCtxPktBufSearchStart(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2166	{
2167	int rc = VINF_SUCCESS;
2168	const uint8_t pbStart = (const uint8_t )memchr(pThis->pbPktBuf, GDBSTUB_PKT_START, cbData);
2169	if (pbStart)
2170	{
2171	/* Found the start character, align the start to the beginning of the packet buffer and advance the state machine. */
2172	memmove(pThis->pbPktBuf, pbStart, cbData - (pbStart - pThis->pbPktBuf));
2173	pThis->enmState = GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY;
2174	*pcbProcessed = (uintptr_t)(pbStart - pThis->pbPktBuf);
2175	pThis->offPktBuf = 0;
2176	}
2177	else
2178	{
2179	/* Check for out of band characters. */
2180	if (memchr(pThis->pbPktBuf, GDBSTUB_OOB_INTERRUPT, cbData) != NULL)
2181	{
2182	/* Stop target and send packet to indicate the target has stopped. */
2183	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM, VMCPUID_ALL))
2184	rc = DBGFR3Halt(pThis->Dbgc.pUVM, VMCPUID_ALL);
2185	/* The reply will be send in the event loop. */
2186	}
2187
2188	/* Not found, ignore the received data and reset the packet buffer. */
2189	dbgcGdbStubCtxPktBufReset(pThis);
2190	*pcbProcessed = cbData;
2191	}
2192
2193	return rc;
2194	}
2195
2196
2197	/**
2198	* Searches for the end character in the current data buffer.
2199	*
2200	* @returns Status code.
2201	* @param pThis The GDB stub context.
2202	* @param cbData Number of new bytes in the packet buffer.
2203	* @param pcbProcessed Where to store the amount of bytes processed.
2204	*/
2205	static int dbgcGdbStubCtxPktBufSearchEnd(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2206	{
2207	const uint8_t pbEnd = (const uint8_t )memchr(&pThis->pbPktBuf[pThis->offPktBuf], GDBSTUB_PKT_END, cbData);
2208	if (pbEnd)
2209	{
2210	/* Found the end character, next comes the checksum. */
2211	pThis->enmState = GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM;
2212
2213	*pcbProcessed = (uintptr_t)(pbEnd - &pThis->pbPktBuf[pThis->offPktBuf]) + 1;
2214	pThis->offPktBuf += *pcbProcessed;
2215	pThis->cbPkt = pThis->offPktBuf - 1; /* Don't account for the start and end character. */
2216	}
2217	else
2218	{
2219	/* Not found, still in the middle of a packet. */
2220	/** @todo Look for out of band characters. */
2221	*pcbProcessed = cbData;
2222	pThis->offPktBuf += cbData;
2223	}
2224
2225	return VINF_SUCCESS;
2226	}
2227
2228
2229	/**
2230	* Processes the checksum.
2231	*
2232	* @returns Status code.
2233	* @param pThis The GDB stub context.
2234	* @param cbData Number of new bytes in the packet buffer.
2235	* @param pcbProcessed Where to store the amount of bytes processed.
2236	*/
2237	static int dbgcGdbStubCtxPktBufProcessChksum(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2238	{
2239	int rc = VINF_SUCCESS;
2240	size_t cbChksumProcessed = (cbData < pThis->cbChksumRecvLeft) ? cbData : pThis->cbChksumRecvLeft;
2241
2242	pThis->cbChksumRecvLeft -= cbChksumProcessed;
2243	if (!pThis->cbChksumRecvLeft)
2244	{
2245	/* Verify checksum of the whole packet. */
2246	uint8_t uChkSum = dbgcGdbStubCtxChrToHex(pThis->pbPktBuf[pThis->offPktBuf]) << 4
2247	\| dbgcGdbStubCtxChrToHex(pThis->pbPktBuf[pThis->offPktBuf + 1]);
2248
2249	uint8_t uSum = 0;
2250	for (size_t i = 1; i < pThis->cbPkt; i++)
2251	uSum += pThis->pbPktBuf[i];
2252
2253	if (uSum == uChkSum)
2254	{
2255	/* Checksum matches, send acknowledge and continue processing the complete payload. */
2256	char chAck = '+';
2257	rc = dbgcGdbStubCtxWrite(pThis, &chAck, sizeof(chAck));
2258	if (RT_SUCCESS(rc))
2259	rc = dbgcGdbStubCtxPktProcess(pThis);
2260	}
2261	else
2262	{
2263	/* Send NACK and reset for the next packet. */
2264	char chAck = '-';
2265	rc = dbgcGdbStubCtxWrite(pThis, &chAck, sizeof(chAck));
2266	}
2267
2268	dbgcGdbStubCtxReset(pThis);
2269	}
2270
2271	*pcbProcessed += cbChksumProcessed;
2272	return rc;
2273	}
2274
2275
2276	/**
2277	* Process read data in the packet buffer based on the current state.
2278	*
2279	* @returns Status code.
2280	* @param pThis The GDB stub context.
2281	* @param cbData Number of new bytes in the packet buffer.
2282	*/
2283	static int dbgcGdbStubCtxPktBufProcess(PGDBSTUBCTX pThis, size_t cbData)
2284	{
2285	int rc = VINF_SUCCESS;
2286
2287	while ( cbData
2288	&& RT_SUCCESS(rc))
2289	{
2290	size_t cbProcessed = 0;
2291
2292	switch (pThis->enmState)
2293	{
2294	case GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START:
2295	{
2296	rc = dbgcGdbStubCtxPktBufSearchStart(pThis, cbData, &cbProcessed);
2297	break;
2298	}
2299	case GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY:
2300	{
2301	rc = dbgcGdbStubCtxPktBufSearchEnd(pThis, cbData, &cbProcessed);
2302	break;
2303	}
2304	case GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM:
2305	{
2306	rc = dbgcGdbStubCtxPktBufProcessChksum(pThis, cbData, &cbProcessed);
2307	break;
2308	}
2309	default:
2310	/* Should never happen. */
2311	rc = VERR_INTERNAL_ERROR;
2312	}
2313
2314	cbData -= cbProcessed;
2315	}
2316
2317	return rc;
2318	}
2319
2320
2321	/**
2322	* Receive data and processes complete packets.
2323	*
2324	* @returns Status code.
2325	* @param pThis The GDB stub context.
2326	*/
2327	static int dbgcGdbStubCtxRecv(PGDBSTUBCTX pThis)
2328	{
2329	/*
2330	* Read in 32 bytes chunks for now (need some peek API to get the amount of bytes actually available
2331	* to make it a bit more optimized).
2332	*/
2333	int rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, 32);
2334	if (RT_SUCCESS(rc))
2335	{
2336	size_t cbThisRead = 32;
2337	rc = pThis->Dbgc.pIo->pfnRead(pThis->Dbgc.pIo, &pThis->pbPktBuf[pThis->offPktBuf], cbThisRead, &cbThisRead);
2338	if (RT_SUCCESS(rc))
2339	rc = dbgcGdbStubCtxPktBufProcess(pThis, cbThisRead);
2340	}
2341
2342	return rc;
2343	}
2344
2345
2346	/**
2347	* Processes debugger events.
2348	*
2349	* @returns VBox status code.
2350	* @param pThis The GDB stub context data.
2351	* @param pEvent Pointer to event data.
2352	*/
2353	static int dbgcGdbStubCtxProcessEvent(PGDBSTUBCTX pThis, PCDBGFEVENT pEvent)
2354	{
2355	/*
2356	* Process the event.
2357	*/
2358	PDBGC pDbgc = &pThis->Dbgc;
2359	pThis->Dbgc.pszScratch = &pThis->Dbgc.achInput[0];
2360	pThis->Dbgc.iArg = 0;
2361	int rc = VINF_SUCCESS;
2362	switch (pEvent->enmType)
2363	{
2364	/*
2365	* The first part is events we have initiated with commands.
2366	*/
2367	case DBGFEVENT_HALT_DONE:
2368	{
2369	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2370	break;
2371	}
2372
2373
2374	/*
2375	* The second part is events which can occur at any time.
2376	*/
2377	case DBGFEVENT_FATAL_ERROR:
2378	{
2379	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbf event: Fatal error! (%s)\n",
2380	dbgcGetEventCtx(pEvent->enmCtx));
2381	if (RT_SUCCESS(rc))
2382	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2383	break;
2384	}
2385
2386	case DBGFEVENT_BREAKPOINT:
2387	case DBGFEVENT_BREAKPOINT_IO:
2388	case DBGFEVENT_BREAKPOINT_MMIO:
2389	case DBGFEVENT_BREAKPOINT_HYPER:
2390	{
2391	rc = dbgcBpExec(pDbgc, pEvent->u.Bp.hBp);
2392	switch (rc)
2393	{
2394	case VERR_DBGC_BP_NOT_FOUND:
2395	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Unknown breakpoint %u! (%s)\n",
2396	pEvent->u.Bp.hBp, dbgcGetEventCtx(pEvent->enmCtx));
2397	break;
2398
2399	case VINF_DBGC_BP_NO_COMMAND:
2400	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Breakpoint %u! (%s)\n",
2401	pEvent->u.Bp.hBp, dbgcGetEventCtx(pEvent->enmCtx));
2402	break;
2403
2404	case VINF_BUFFER_OVERFLOW:
2405	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Breakpoint %u! Command too long to execute! (%s)\n",
2406	pEvent->u.Bp.hBp, dbgcGetEventCtx(pEvent->enmCtx));
2407	break;
2408
2409	default:
2410	break;
2411	}
2412	if (RT_SUCCESS(rc) && DBGFR3IsHalted(pDbgc->pUVM, VMCPUID_ALL))
2413	{
2414	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2415
2416	/* Set the resume flag to ignore the breakpoint when resuming execution. */
2417	if ( RT_SUCCESS(rc)
2418	&& pEvent->enmType == DBGFEVENT_BREAKPOINT)
2419	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r eflags.rf = 1");
2420	}
2421
2422	if (RT_FAILURE(rc))
2423	pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "Executing the breakpoint %u (%s) failed with %Rrc!\n",
2424	pEvent->u.Bp.hBp, dbgcGetEventCtx(pEvent->enmCtx), rc);
2425
2426	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2427	break;
2428	}
2429
2430	case DBGFEVENT_STEPPED:
2431	case DBGFEVENT_STEPPED_HYPER:
2432	{
2433	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2434	break;
2435	}
2436
2437	case DBGFEVENT_ASSERTION_HYPER:
2438	{
2439	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2440	"\ndbgf event: Hypervisor Assertion! (%s)\n"
2441	"%s"
2442	"%s"
2443	"\n",
2444	dbgcGetEventCtx(pEvent->enmCtx),
2445	pEvent->u.Assert.pszMsg1,
2446	pEvent->u.Assert.pszMsg2);
2447	if (RT_SUCCESS(rc))
2448	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2449	break;
2450	}
2451
2452	case DBGFEVENT_DEV_STOP:
2453	{
2454	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2455	"\n"
2456	"dbgf event: DBGFSTOP (%s)\n"
2457	"File: %s\n"
2458	"Line: %d\n"
2459	"Function: %s\n",
2460	dbgcGetEventCtx(pEvent->enmCtx),
2461	pEvent->u.Src.pszFile,
2462	pEvent->u.Src.uLine,
2463	pEvent->u.Src.pszFunction);
2464	if (RT_SUCCESS(rc) && pEvent->u.Src.pszMessage && *pEvent->u.Src.pszMessage)
2465	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2466	"Message: %s\n",
2467	pEvent->u.Src.pszMessage);
2468	if (RT_SUCCESS(rc))
2469	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2470	break;
2471	}
2472
2473
2474	case DBGFEVENT_INVALID_COMMAND:
2475	{
2476	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf/dbgc error: Invalid command event!\n");
2477	break;
2478	}
2479
2480	case DBGFEVENT_POWERING_OFF:
2481	{
2482	pThis->Dbgc.fReady = false;
2483	pThis->Dbgc.pIo->pfnSetReady(pThis->Dbgc.pIo, false);
2484	rc = VERR_GENERAL_FAILURE;
2485	break;
2486	}
2487
2488	default:
2489	{
2490	/*
2491	* Probably a generic event. Look it up to find its name.
2492	*/
2493	PCDBGCSXEVT pEvtDesc = dbgcEventLookup(pEvent->enmType);
2494	if (pEvtDesc)
2495	{
2496	if (pEvtDesc->enmKind == kDbgcSxEventKind_Interrupt)
2497	{
2498	Assert(pEvtDesc->pszDesc);
2499	Assert(pEvent->u.Generic.cArgs == 1);
2500	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s no %#llx! (%s)\n",
2501	pEvtDesc->pszDesc, pEvent->u.Generic.auArgs[0], pEvtDesc->pszName);
2502	}
2503	else if (pEvtDesc->fFlags & DBGCSXEVT_F_BUGCHECK)
2504	{
2505	Assert(pEvent->u.Generic.cArgs >= 5);
2506	char szDetails[512];
2507	DBGFR3FormatBugCheck(pDbgc->pUVM, szDetails, sizeof(szDetails), pEvent->u.Generic.auArgs[0],
2508	pEvent->u.Generic.auArgs[1], pEvent->u.Generic.auArgs[2],
2509	pEvent->u.Generic.auArgs[3], pEvent->u.Generic.auArgs[4]);
2510	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s %s%s!\n%s", pEvtDesc->pszName,
2511	pEvtDesc->pszDesc ? "- " : "", pEvtDesc->pszDesc ? pEvtDesc->pszDesc : "",
2512	szDetails);
2513	}
2514	else if ( (pEvtDesc->fFlags & DBGCSXEVT_F_TAKE_ARG)
2515	\|\| pEvent->u.Generic.cArgs > 1
2516	\|\| ( pEvent->u.Generic.cArgs == 1
2517	&& pEvent->u.Generic.auArgs[0] != 0))
2518	{
2519	if (pEvtDesc->pszDesc)
2520	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s - %s!",
2521	pEvtDesc->pszName, pEvtDesc->pszDesc);
2522	else
2523	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s!", pEvtDesc->pszName);
2524	if (pEvent->u.Generic.cArgs <= 1)
2525	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, " arg=%#llx\n", pEvent->u.Generic.auArgs[0]);
2526	else
2527	{
2528	for (uint32_t i = 0; i < pEvent->u.Generic.cArgs; i++)
2529	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, " args[%u]=%#llx", i, pEvent->u.Generic.auArgs[i]);
2530	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\n");
2531	}
2532	}
2533	else
2534	{
2535	if (pEvtDesc->pszDesc)
2536	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s - %s!\n",
2537	pEvtDesc->pszName, pEvtDesc->pszDesc);
2538	else
2539	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s!\n", pEvtDesc->pszName);
2540	}
2541	}
2542	else
2543	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf/dbgc error: Unknown event %d!\n", pEvent->enmType);
2544	break;
2545	}
2546	}
2547
2548	return rc;
2549	}
2550
2551
2552	/**
2553	* Run the debugger console.
2554	*
2555	* @returns VBox status code.
2556	* @param pThis Pointer to the GDB stub context.
2557	*/
2558	static int dbgcGdbStubRun(PGDBSTUBCTX pThis)
2559	{
2560	/* Select the register set based on the CPU mode. */
2561	CPUMMODE enmMode = DBGCCmdHlpGetCpuMode(&pThis->Dbgc.CmdHlp);
2562	switch (enmMode)
2563	{
2564	case CPUMMODE_PROTECTED:
2565	pThis->paRegs = &g_aGdbRegs32[0];
2566	pThis->cRegs = RT_ELEMENTS(g_aGdbRegs32);
2567	break;
2568	case CPUMMODE_LONG:
2569	pThis->paRegs = &g_aGdbRegs64[0];
2570	pThis->cRegs = RT_ELEMENTS(g_aGdbRegs64);
2571	break;
2572	case CPUMMODE_REAL:
2573	default:
2574	return DBGCCmdHlpPrintf(&pThis->Dbgc.CmdHlp, "error: Invalid CPU mode %d.\n", enmMode);
2575	}
2576
2577	/*
2578	* We're ready for commands now.
2579	*/
2580	pThis->Dbgc.fReady = true;
2581	pThis->Dbgc.pIo->pfnSetReady(pThis->Dbgc.pIo, true);
2582
2583	/*
2584	* Main Debugger Loop.
2585	*
2586	* This loop will either block on waiting for input or on waiting on
2587	* debug events. If we're forwarding the log we cannot wait for long
2588	* before we must flush the log.
2589	*/
2590	int rc;
2591	for (;;)
2592	{
2593	rc = VERR_SEM_OUT_OF_TURN;
2594	if (pThis->Dbgc.pUVM)
2595	rc = DBGFR3QueryWaitable(pThis->Dbgc.pUVM);
2596
2597	if (RT_SUCCESS(rc))
2598	{
2599	/*
2600	* Wait for a debug event.
2601	*/
2602	DBGFEVENT Event;
2603	rc = DBGFR3EventWait(pThis->Dbgc.pUVM, 32, &Event);
2604	if (RT_SUCCESS(rc))
2605	{
2606	rc = dbgcGdbStubCtxProcessEvent(pThis, &Event);
2607	if (RT_FAILURE(rc))
2608	break;
2609	}
2610	else if (rc != VERR_TIMEOUT)
2611	break;
2612
2613	/*
2614	* Check for input.
2615	*/
2616	if (pThis->Dbgc.pIo->pfnInput(pThis->Dbgc.pIo, 0))
2617	{
2618	rc = dbgcGdbStubCtxRecv(pThis);
2619	if (RT_FAILURE(rc))
2620	break;
2621	}
2622	}
2623	else if (rc == VERR_SEM_OUT_OF_TURN)
2624	{
2625	/*
2626	* Wait for input.
2627	*/
2628	if (pThis->Dbgc.pIo->pfnInput(pThis->Dbgc.pIo, 1000))
2629	{
2630	rc = dbgcGdbStubCtxRecv(pThis);
2631	if (RT_FAILURE(rc))
2632	break;
2633	}
2634	}
2635	else
2636	break;
2637	}
2638
2639	return rc;
2640	}
2641
2642
2643	/**
2644	* @copydoc DBGC::pfnOutput
2645	*/
2646	static DECLCALLBACK(int) dbgcOutputGdb(void pvUser, const char pachChars, size_t cbChars)
2647	{
2648	PGDBSTUBCTX pThis = (PGDBSTUBCTX)pvUser;
2649
2650	pThis->fOutput = true;
2651	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
2652	if (RT_SUCCESS(rc))
2653	{
2654	uint8_t chConOut = 'O';
2655	rc = dbgcGdbStubCtxReplySendData(pThis, &chConOut, sizeof(chConOut));
2656	if (RT_SUCCESS(rc))
2657	{
2658	/* Convert the characters to hex. */
2659	const char *pachCur = pachChars;
2660
2661	while ( cbChars
2662	&& RT_SUCCESS(rc))
2663	{
2664	uint8_t achHex[512 + 1];
2665	size_t cbThisSend = RT_MIN((sizeof(achHex) - 1) / 2, cbChars); /* Each character needs two bytes. */
2666
2667	rc = dbgcGdbStubCtxEncodeBinaryAsHex(&achHex[0], cbThisSend * 2 + 1, pachCur, cbThisSend);
2668	if (RT_SUCCESS(rc))
2669	rc = dbgcGdbStubCtxReplySendData(pThis, &achHex[0], cbThisSend * 2);
2670
2671	pachCur += cbThisSend;
2672	cbChars -= cbThisSend;
2673	}
2674	}
2675
2676	dbgcGdbStubCtxReplySendEnd(pThis);
2677	}
2678
2679	return rc;
2680	}
2681
2682
2683	/**
2684	* Creates a GDB stub context instance with the given backend.
2685	*
2686	* @returns VBox status code.
2687	* @param ppGdbStubCtx Where to store the pointer to the GDB stub context instance on success.
2688	* @param pIo Pointer to the I/O callback table.
2689	* @param fFlags Flags controlling the behavior.
2690	*/
2691	static int dbgcGdbStubCtxCreate(PPGDBSTUBCTX ppGdbStubCtx, PCDBGCIO pIo, unsigned fFlags)
2692	{
2693	/*
2694	* Validate input.
2695	*/
2696	AssertPtrReturn(pIo, VERR_INVALID_POINTER);
2697	AssertMsgReturn(!fFlags, ("%#x", fFlags), VERR_INVALID_PARAMETER);
2698
2699	/*
2700	* Allocate and initialize.
2701	*/
2702	PGDBSTUBCTX pThis = (PGDBSTUBCTX)RTMemAllocZ(sizeof(*pThis));
2703	if (!pThis)
2704	return VERR_NO_MEMORY;
2705
2706	dbgcInitCmdHlp(&pThis->Dbgc);
2707	/*
2708	* This is compied from the native debug console (will be used for monitor commands)
2709	* in DBGCConsole.cpp. Try to keep both functions in sync.
2710	*/
2711	pThis->Dbgc.pIo = pIo;
2712	pThis->Dbgc.pfnOutput = dbgcOutputGdb;
2713	pThis->Dbgc.pvOutputUser = pThis;
2714	pThis->Dbgc.pVM = NULL;
2715	pThis->Dbgc.pUVM = NULL;
2716	pThis->Dbgc.idCpu = 0;
2717	pThis->Dbgc.hDbgAs = DBGF_AS_GLOBAL;
2718	pThis->Dbgc.pszEmulation = "CodeView/WinDbg";
2719	pThis->Dbgc.paEmulationCmds = &g_aCmdsCodeView[0];
2720	pThis->Dbgc.cEmulationCmds = g_cCmdsCodeView;
2721	pThis->Dbgc.paEmulationFuncs = &g_aFuncsCodeView[0];
2722	pThis->Dbgc.cEmulationFuncs = g_cFuncsCodeView;
2723	//pThis->Dbgc.fLog = false;
2724	pThis->Dbgc.fRegTerse = true;
2725	pThis->Dbgc.fStepTraceRegs = true;
2726	//pThis->Dbgc.cPagingHierarchyDumps = 0;
2727	//pThis->Dbgc.DisasmPos = {0};
2728	//pThis->Dbgc.SourcePos = {0};
2729	//pThis->Dbgc.DumpPos = {0};
2730	pThis->Dbgc.pLastPos = &pThis->Dbgc.DisasmPos;
2731	//pThis->Dbgc.cbDumpElement = 0;
2732	//pThis->Dbgc.cVars = 0;
2733	//pThis->Dbgc.paVars = NULL;
2734	//pThis->Dbgc.pPlugInHead = NULL;
2735	//pThis->Dbgc.pFirstBp = NULL;
2736	//pThis->Dbgc.abSearch = {0};
2737	//pThis->Dbgc.cbSearch = 0;
2738	pThis->Dbgc.cbSearchUnit = 1;
2739	pThis->Dbgc.cMaxSearchHits = 1;
2740	//pThis->Dbgc.SearchAddr = {0};
2741	//pThis->Dbgc.cbSearchRange = 0;
2742
2743	//pThis->Dbgc.uInputZero = 0;
2744	//pThis->Dbgc.iRead = 0;
2745	//pThis->Dbgc.iWrite = 0;
2746	//pThis->Dbgc.cInputLines = 0;
2747	//pThis->Dbgc.fInputOverflow = false;
2748	pThis->Dbgc.fReady = true;
2749	pThis->Dbgc.pszScratch = &pThis->Dbgc.achScratch[0];
2750	//pThis->Dbgc.iArg = 0;
2751	//pThis->Dbgc.rcOutput = 0;
2752	//pThis->Dbgc.rcCmd = 0;
2753
2754	//pThis->Dbgc.pszHistoryFile = NULL;
2755	//pThis->Dbgc.pszGlobalInitScript = NULL;
2756	//pThis->Dbgc.pszLocalInitScript = NULL;
2757
2758	dbgcEvalInit();
2759
2760	/* Init the GDB stub specific parts. */
2761	pThis->cbPktBufMax = 0;
2762	pThis->pbPktBuf = NULL;
2763	pThis->fFeatures = GDBSTUBCTX_FEATURES_F_TGT_DESC;
2764	pThis->pachTgtXmlDesc = NULL;
2765	pThis->cbTgtXmlDesc = 0;
2766	pThis->fExtendedMode = false;
2767	pThis->fOutput = false;
2768	pThis->fInThrdInfoQuery = false;
2769	RTListInit(&pThis->LstTps);
2770	dbgcGdbStubCtxReset(pThis);
2771
2772	*ppGdbStubCtx = pThis;
2773	return VINF_SUCCESS;
2774	}
2775
2776
2777	/**
2778	* Destroys the given GDB stub context.
2779	*
2780	* @param pThis The GDB stub context to destroy.
2781	*/
2782	static void dbgcGdbStubDestroy(PGDBSTUBCTX pThis)
2783	{
2784	AssertPtr(pThis);
2785
2786	/* Detach from the VM. */
2787	if (pThis->Dbgc.pUVM)
2788	DBGFR3Detach(pThis->Dbgc.pUVM);
2789
2790	/* Free config strings. */
2791	RTStrFree(pThis->Dbgc.pszGlobalInitScript);
2792	pThis->Dbgc.pszGlobalInitScript = NULL;
2793	RTStrFree(pThis->Dbgc.pszLocalInitScript);
2794	pThis->Dbgc.pszLocalInitScript = NULL;
2795	RTStrFree(pThis->Dbgc.pszHistoryFile);
2796	pThis->Dbgc.pszHistoryFile = NULL;
2797
2798	/* Finally, free the instance memory. */
2799	RTMemFree(pThis);
2800	}
2801
2802
2803	DECL_HIDDEN_CALLBACK(int) dbgcGdbStubRunloop(PUVM pUVM, PCDBGCIO pIo, unsigned fFlags)
2804	{
2805	/*
2806	* Validate input.
2807	*/
2808	AssertPtrNullReturn(pUVM, VERR_INVALID_VM_HANDLE);
2809	PVM pVM = NULL;
2810	if (pUVM)
2811	{
2812	pVM = VMR3GetVM(pUVM);
2813	AssertPtrReturn(pVM, VERR_INVALID_VM_HANDLE);
2814	}
2815
2816	/*
2817	* Allocate and initialize instance data
2818	*/
2819	PGDBSTUBCTX pThis;
2820	int rc = dbgcGdbStubCtxCreate(&pThis, pIo, fFlags);
2821	if (RT_FAILURE(rc))
2822	return rc;
2823	if (!HMR3IsEnabled(pUVM) && !NEMR3IsEnabled(pUVM))
2824	pThis->Dbgc.hDbgAs = DBGF_AS_RC_AND_GC_GLOBAL;
2825
2826	/*
2827	* Attach to the specified VM.
2828	*/
2829	if (RT_SUCCESS(rc) && pUVM)
2830	{
2831	rc = DBGFR3Attach(pUVM);
2832	if (RT_SUCCESS(rc))
2833	{
2834	pThis->Dbgc.pVM = pVM;
2835	pThis->Dbgc.pUVM = pUVM;
2836	pThis->Dbgc.idCpu = 0;
2837	}
2838	else
2839	rc = pThis->Dbgc.CmdHlp.pfnVBoxError(&pThis->Dbgc.CmdHlp, rc, "When trying to attach to VM %p\n", pThis->Dbgc.pVM);
2840	}
2841
2842	/*
2843	* Load plugins.
2844	*/
2845	if (RT_SUCCESS(rc))
2846	{
2847	if (pVM)
2848	DBGFR3PlugInLoadAll(pThis->Dbgc.pUVM);
2849	dbgcEventInit(&pThis->Dbgc);
2850	//dbgcRunInitScripts(pDbgc); Not yet
2851
2852	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM, VMCPUID_ALL))
2853	rc = DBGFR3Halt(pThis->Dbgc.pUVM, VMCPUID_ALL);
2854
2855	/*
2856	* Run the debugger main loop.
2857	*/
2858	rc = dbgcGdbStubRun(pThis);
2859	dbgcEventTerm(&pThis->Dbgc);
2860	}
2861
2862	/*
2863	* Cleanup console debugger session.
2864	*/
2865	dbgcGdbStubDestroy(pThis);
2866	return rc == VERR_DBGC_QUIT ? VINF_SUCCESS : rc;
2867	}
2868

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source: vbox/trunk/src/VBox/Debugger/DBGCGdbRemoteStub.cpp

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