DBGCGdbRemoteStub.cpp@ 85972

Last change on this file since 85972 was 85367, checked in by vboxsync, 4 years ago
Debugger/GDBStub: Support 32bit mode as well
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1	/* $Id: DBGCGdbRemoteStub.cpp 85367 2020-07-17 08:50:59Z vboxsync $ */
2	/** @file
3	* DBGC - Debugger Console, GDB Remote Stub.
4	*/
5
6	/*
7	* Copyright (C) 2010-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#include <VBox/dbg.h>
23	#include <VBox/vmm/dbgf.h>
24	#include <VBox/vmm/vmapi.h> /* VMR3GetVM() */
25	#include <VBox/vmm/hm.h> /* HMR3IsEnabled */
26	#include <VBox/vmm/nem.h> /* NEMR3IsEnabled */
27	#include <iprt/cdefs.h>
28	#include <iprt/err.h>
29	#include <iprt/list.h>
30	#include <iprt/mem.h>
31	#include <iprt/string.h>
32
33	#include <stdlib.h>
34
35	#include "DBGCInternal.h"
36
37
38	/*********************************************************************************************************************************
39	* Defined Constants And Macros *
40	*********************************************************************************************************************************/
41
42	/** Character indicating the start of a packet. */
43	#define GDBSTUB_PKT_START '$'
44	/** Character indicating the end of a packet (excluding the checksum). */
45	#define GDBSTUB_PKT_END '#'
46	/** The escape character. */
47	#define GDBSTUB_PKT_ESCAPE '{'
48	/** The out-of-band interrupt character. */
49	#define GDBSTUB_OOB_INTERRUPT 0x03
50
51
52	/** Indicate support for the 'qXfer:features:read' packet to support the target description. */
53	#define GDBSTUBCTX_FEATURES_F_TGT_DESC RT_BIT(0)
54
55
56	/*********************************************************************************************************************************
57	* Structures and Typedefs *
58	*********************************************************************************************************************************/
59
60	/**
61	* Trace point type.
62	*/
63	typedef enum GDBSTUBTPTYPE
64	{
65	/** Invalid type, do not use. */
66	GDBSTUBTPTYPE_INVALID = 0,
67	/** An instruction software trace point. */
68	GDBSTUBTPTYPE_EXEC_SW,
69	/** An instruction hardware trace point. */
70	GDBSTUBTPTYPE_EXEC_HW,
71	/** A memory read trace point. */
72	GDBSTUBTPTYPE_MEM_READ,
73	/** A memory write trace point. */
74	GDBSTUBTPTYPE_MEM_WRITE,
75	/** A memory access trace point. */
76	GDBSTUBTPTYPE_MEM_ACCESS,
77	/** 32bit hack. */
78	GDBSTUBTPTYPE_32BIT_HACK = 0x7fffffff
79	} GDBSTUBTPTYPE;
80
81
82	/**
83	* GDB stub receive state.
84	*/
85	typedef enum GDBSTUBRECVSTATE
86	{
87	/** Invalid state. */
88	GDBSTUBRECVSTATE_INVALID = 0,
89	/** Waiting for the start character. */
90	GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START,
91	/** Reiceiving the packet body up until the END character. */
92	GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY,
93	/** Receiving the checksum. */
94	GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM,
95	/** Blow up the enum to 32bits for easier alignment of members in structs. */
96	GDBSTUBRECVSTATE_32BIT_HACK = 0x7fffffff
97	} GDBSTUBRECVSTATE;
98
99
100	/**
101	* GDB target register descriptor.
102	*/
103	typedef struct GDBREGDESC
104	{
105	/** Register name. */
106	const char *pszName;
107	/** DBGF register index. */
108	DBGFREG enmReg;
109	/** Bitsize */
110	uint32_t cBits;
111	/** Type. */
112	const char *pszType;
113	/** Group. */
114	const char *pszGroup;
115	} GDBREGDESC;
116	/** Pointer to a GDB target register descriptor. */
117	typedef GDBREGDESC *PGDBREGDESC;
118	/** Pointer to a const GDB target register descriptor. */
119	typedef const GDBREGDESC *PCGDBREGDESC;
120
121
122	/**
123	* A tracepoint descriptor.
124	*/
125	typedef struct GDBSTUBTP
126	{
127	/** List node for the list of tracepoints. */
128	RTLISTNODE NdTps;
129	/** The breakpoint number from the DBGF API. */
130	uint32_t iBp;
131	/** The tracepoint type for identification. */
132	GDBSTUBTPTYPE enmTpType;
133	/** The tracepoint address for identification. */
134	uint64_t GdbTgtAddr;
135	/** The tracepoint kind for identification. */
136	uint64_t uKind;
137	} GDBSTUBTP;
138	/** Pointer to a tracepoint. */
139	typedef GDBSTUBTP *PGDBSTUBTP;
140
141
142	/**
143	* GDB stub context data.
144	*/
145	typedef struct GDBSTUBCTX
146	{
147	/** Internal debugger console data. */
148	DBGC Dbgc;
149	/** The current state when receiving a new packet. */
150	GDBSTUBRECVSTATE enmState;
151	/** Maximum number of bytes the packet buffer can hold. */
152	size_t cbPktBufMax;
153	/** Current offset into the packet buffer. */
154	size_t offPktBuf;
155	/** The size of the packet (minus the start, end characters and the checksum). */
156	size_t cbPkt;
157	/** Pointer to the packet buffer data. */
158	uint8_t *pbPktBuf;
159	/** Number of bytes left for the checksum. */
160	size_t cbChksumRecvLeft;
161	/** Send packet checksum. */
162	uint8_t uChkSumSend;
163	/** Feature flags supported we negotiated with the remote end. */
164	uint32_t fFeatures;
165	/** Pointer to the XML target description. */
166	char *pachTgtXmlDesc;
167	/** Size of the XML target description. */
168	size_t cbTgtXmlDesc;
169	/** Pointer to the selected GDB register set. */
170	PCGDBREGDESC paRegs;
171	/** Number of entries in the register set. */
172	uint32_t cRegs;
173	/** Flag whether the stub is in extended mode. */
174	bool fExtendedMode;
175	/** Flag whether was something was output using the 'O' packet since it was reset last. */
176	bool fOutput;
177	/** List of registered trace points.
178	* GDB removes breakpoints/watchpoints using the parameters they were
179	* registered with while we only use the BP number form DBGF internally.
180	* Means we have to track all registration so we can remove them later on. */
181	RTLISTANCHOR LstTps;
182	/** Flag whether a ThreadInfo query was started. */
183	bool fInThrdInfoQuery;
184	/** Next ID to return in the current ThreadInfo query. */
185	VMCPUID idCpuNextThrdInfoQuery;
186	} GDBSTUBCTX;
187	/** Pointer to the GDB stub context data. */
188	typedef GDBSTUBCTX *PGDBSTUBCTX;
189	/** Pointer to const GDB stub context data. */
190	typedef const GDBSTUBCTX *PCGDBSTUBCTX;
191	/** Pointer to a GDB stub context data pointer. */
192	typedef PGDBSTUBCTX *PPGDBSTUBCTX;
193
194
195	/**
196	* Specific query packet processor callback.
197	*
198	* @returns Status code.
199	* @param pThis The GDB stub context.
200	* @param pbVal Pointer to the remaining value.
201	* @param cbVal Size of the remaining value in bytes.
202	*/
203	typedef DECLCALLBACKTYPE(int, FNGDBSTUBQPKTPROC,(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal));
204	typedef FNGDBSTUBQPKTPROC *PFNGDBSTUBQPKTPROC;
205
206
207	/**
208	* 'q' packet processor.
209	*/
210	typedef struct GDBSTUBQPKTPROC
211	{
212	/** Name */
213	const char *pszName;
214	/** Length of name in characters (without \0 terminator). */
215	uint32_t cchName;
216	/** The callback to call for processing the particular query. */
217	PFNGDBSTUBQPKTPROC pfnProc;
218	} GDBSTUBQPKTPROC;
219	/** Pointer to a 'q' packet processor entry. */
220	typedef GDBSTUBQPKTPROC *PGDBSTUBQPKTPROC;
221	/** Pointer to a const 'q' packet processor entry. */
222	typedef const GDBSTUBQPKTPROC *PCGDBSTUBQPKTPROC;
223
224
225	/**
226	* 'v' packet processor.
227	*/
228	typedef struct GDBSTUBVPKTPROC
229	{
230	/** Name */
231	const char *pszName;
232	/** Length of name in characters (without \0 terminator). */
233	uint32_t cchName;
234	/** Replay to a query packet (ends with ?). */
235	const char *pszReplyQ;
236	/** Length of the query reply (without \0 terminator). */
237	uint32_t cchReplyQ;
238	/** The callback to call for processing the particular query. */
239	PFNGDBSTUBQPKTPROC pfnProc;
240	} GDBSTUBVPKTPROC;
241	/** Pointer to a 'q' packet processor entry. */
242	typedef GDBSTUBVPKTPROC *PGDBSTUBVPKTPROC;
243	/** Pointer to a const 'q' packet processor entry. */
244	typedef const GDBSTUBVPKTPROC *PCGDBSTUBVPKTPROC;
245
246
247	/**
248	* Feature callback.
249	*
250	* @returns Status code.
251	* @param pThis The GDB stub context.
252	* @param pbVal Pointer to the value.
253	* @param cbVal Size of the value in bytes.
254	*/
255	typedef DECLCALLBACKTYPE(int, FNGDBSTUBFEATHND,(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal));
256	typedef FNGDBSTUBFEATHND *PFNGDBSTUBFEATHND;
257
258
259	/**
260	* GDB feature descriptor.
261	*/
262	typedef struct GDBSTUBFEATDESC
263	{
264	/** Feature name */
265	const char *pszName;
266	/** Length of the feature name in characters (without \0 terminator). */
267	uint32_t cchName;
268	/** The callback to call for processing the particular feature. */
269	PFNGDBSTUBFEATHND pfnHandler;
270	/** Flag whether the feature requires a value. */
271	bool fVal;
272	} GDBSTUBFEATDESC;
273	/** Pointer to a GDB feature descriptor. */
274	typedef GDBSTUBFEATDESC *PGDBSTUBFEATDESC;
275	/** Pointer to a const GDB feature descriptor. */
276	typedef const GDBSTUBFEATDESC *PCGDBSTUBFEATDESC;
277
278
279	/*********************************************************************************************************************************
280	* Internal Functions *
281	*********************************************************************************************************************************/
282
283
284	/**
285	* Tries to find a trace point with the given parameters in the list of registered trace points.
286	*
287	* @returns Pointer to the trace point registration record if found or NULL if none was found.
288	* @param pThis The GDB stub context.
289	* @param enmTpType The trace point type.
290	* @param GdbTgtAddr Target address given by GDB.
291	* @param uKind Trace point kind.
292	*/
293	static PGDBSTUBTP dbgcGdbStubTpFind(PGDBSTUBCTX pThis, GDBSTUBTPTYPE enmTpType, uint64_t GdbTgtAddr, uint64_t uKind)
294	{
295	PGDBSTUBTP pTpCur = NULL;
296	RTListForEach(&pThis->LstTps, pTpCur, GDBSTUBTP, NdTps)
297	{
298	if ( pTpCur->enmTpType == enmTpType
299	&& pTpCur->GdbTgtAddr == GdbTgtAddr
300	&& pTpCur->uKind == uKind)
301	return pTpCur;
302	}
303
304	return NULL;
305	}
306
307
308	/**
309	* Registers a new trace point.
310	*
311	* @returns VBox status code.
312	* @param pThis The GDB stub context.
313	* @param enmTpType The trace point type.
314	* @param GdbTgtAddr Target address given by GDB.
315	* @param uKind Trace point kind.
316	* @param iBp The internal DBGF breakpoint ID this trace point was registered with.
317	*/
318	static int dbgcGdbStubTpRegister(PGDBSTUBCTX pThis, GDBSTUBTPTYPE enmTpType, uint64_t GdbTgtAddr, uint64_t uKind, uint32_t iBp)
319	{
320	int rc = VERR_ALREADY_EXISTS;
321
322	/* Can't register a tracepoint with the same parameters twice or we can't decide whom to remove later on. */
323	PGDBSTUBTP pTp = dbgcGdbStubTpFind(pThis, enmTpType, GdbTgtAddr, uKind);
324	if (!pTp)
325	{
326	pTp = (PGDBSTUBTP)RTMemAllocZ(sizeof(*pTp));
327	if (pTp)
328	{
329	pTp->enmTpType = enmTpType;
330	pTp->GdbTgtAddr = GdbTgtAddr;
331	pTp->uKind = uKind;
332	pTp->iBp = iBp;
333	RTListAppend(&pThis->LstTps, &pTp->NdTps);
334	rc = VINF_SUCCESS;
335	}
336	else
337	rc = VERR_NO_MEMORY;
338	}
339
340	return rc;
341	}
342
343
344	/**
345	* Deregisters the given trace point (needs to be unregistered from DBGF by the caller before).
346	*
347	* @returns nothing.
348	* @param pTp The trace point to deregister.
349	*/
350	static void dbgcGdbStubTpDeregister(PGDBSTUBTP pTp)
351	{
352	RTListNodeRemove(&pTp->NdTps);
353	RTMemFree(pTp);
354	}
355
356
357	/**
358	* Converts a given to the hexadecimal value if valid.
359	*
360	* @returns The hexadecimal value the given character represents 0-9,a-f,A-F or 0xff on error.
361	* @param ch The character to convert.
362	*/
363	DECLINLINE(uint8_t) dbgcGdbStubCtxChrToHex(char ch)
364	{
365	if (ch >= '0' && ch <= '9')
366	return ch - '0';
367	if (ch >= 'A' && ch <= 'F')
368	return ch - 'A' + 0xa;
369	if (ch >= 'a' && ch <= 'f')
370	return ch - 'a' + 0xa;
371
372	return 0xff;
373	}
374
375
376	/**
377	* Converts a 4bit hex number to the appropriate character.
378	*
379	* @returns Character representing the 4bit hex number.
380	* @param uHex The 4 bit hex number.
381	*/
382	DECLINLINE(char) dbgcGdbStubCtxHexToChr(uint8_t uHex)
383	{
384	if (uHex < 0xa)
385	return '0' + uHex;
386	if (uHex <= 0xf)
387	return 'A' + uHex - 0xa;
388
389	return 'X';
390	}
391
392
393	/**
394	* Wrapper for the I/O interface write callback.
395	*
396	* @returns Status code.
397	* @param pThis The GDB stub context.
398	* @param pvPkt The packet data to send.
399	* @param cbPkt Size of the packet in bytes.
400	*/
401	DECLINLINE(int) dbgcGdbStubCtxWrite(PGDBSTUBCTX pThis, const void *pvPkt, size_t cbPkt)
402	{
403	return pThis->Dbgc.pBack->pfnWrite(pThis->Dbgc.pBack, pvPkt, cbPkt, NULL /pcbWritten/);
404	}
405
406
407	/**
408	* Starts transmission of a new reply packet.
409	*
410	* @returns Status code.
411	* @param pThis The GDB stub context.
412	*/
413	static int dbgcGdbStubCtxReplySendBegin(PGDBSTUBCTX pThis)
414	{
415	pThis->uChkSumSend = 0;
416
417	uint8_t chPktStart = GDBSTUB_PKT_START;
418	return dbgcGdbStubCtxWrite(pThis, &chPktStart, sizeof(chPktStart));
419	}
420
421
422	/**
423	* Sends the given data in the reply.
424	*
425	* @returns Status code.
426	* @param pThis The GDB stub context.
427	* @param pvReplyData The reply data to send.
428	* @param cbReplyData Size of the reply data in bytes.
429	*/
430	static int dbgcGdbStubCtxReplySendData(PGDBSTUBCTX pThis, const void *pvReplyData, size_t cbReplyData)
431	{
432	/* Update checksum. */
433	const uint8_t pbData = (const uint8_t )pvReplyData;
434	for (uint32_t i = 0; i < cbReplyData; i++)
435	pThis->uChkSumSend += pbData[i];
436
437	return dbgcGdbStubCtxWrite(pThis, pvReplyData, cbReplyData);
438	}
439
440
441	/**
442	* Finishes transmission of the current reply by sending the packet end character and the checksum.
443	*
444	* @returns Status code.
445	* @param pThis The GDB stub context.
446	*/
447	static int dbgcGdbStubCtxReplySendEnd(PGDBSTUBCTX pThis)
448	{
449	uint8_t achPktEnd[3];
450
451	achPktEnd[0] = GDBSTUB_PKT_END;
452	achPktEnd[1] = dbgcGdbStubCtxHexToChr(pThis->uChkSumSend >> 4);
453	achPktEnd[2] = dbgcGdbStubCtxHexToChr(pThis->uChkSumSend & 0xf);
454
455	return dbgcGdbStubCtxWrite(pThis, &achPktEnd[0], sizeof(achPktEnd));
456	}
457
458
459	/**
460	* Sends the given reply packet, doing the framing, checksumming, etc. in one call.
461	*
462	* @returns Status code.
463	* @param pThis The GDB stub context.
464	* @param pvReplyPkt The reply packet to send.
465	* @param cbReplyPkt Size of the reply packet in bytes.
466	*/
467	static int dbgcGdbStubCtxReplySend(PGDBSTUBCTX pThis, const void *pvReplyPkt, size_t cbReplyPkt)
468	{
469	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
470	if (RT_SUCCESS(rc))
471	{
472	rc = dbgcGdbStubCtxReplySendData(pThis, pvReplyPkt, cbReplyPkt);
473	if (RT_SUCCESS(rc))
474	rc = dbgcGdbStubCtxReplySendEnd(pThis);
475	}
476
477	return rc;
478	}
479
480
481	/**
482	* Encodes the given buffer as a hexstring string it into the given destination buffer.
483	*
484	* @returns Status code.
485	* @param pbDst Where store the resulting hex string on success.
486	* @param cbDst Size of the destination buffer in bytes.
487	* @param pvSrc The data to encode.
488	* @param cbSrc Number of bytes to encode.
489	*/
490	DECLINLINE(int) dbgcGdbStubCtxEncodeBinaryAsHex(uint8_t pbDst, size_t cbDst, const void pvSrc, size_t cbSrc)
491	{
492	return RTStrPrintHexBytes((char *)pbDst, cbDst, pvSrc, cbSrc, RTSTRPRINTHEXBYTES_F_UPPER);
493	}
494
495
496	/**
497	* Decodes the given ASCII hexstring as binary data up until the given separator is found or the end of the string is reached.
498	*
499	* @returns Status code.
500	* @param pbBuf The buffer containing the hexstring to convert.
501	* @param cbBuf Size of the buffer in bytes.
502	* @param puVal Where to store the decoded integer.
503	* @param chSep The character to stop conversion at.
504	* @param ppbSep Where to store the pointer in the buffer where the separator was found, optional.
505	*/
506	static int dbgcGdbStubCtxParseHexStringAsInteger(const uint8_t pbBuf, size_t cbBuf, uint64_t puVal, uint8_t chSep, const uint8_t **ppbSep)
507	{
508	uint64_t uVal = 0;
509
510	while ( cbBuf
511	&& *pbBuf != chSep)
512	{
513	uVal = uVal * 16 + dbgcGdbStubCtxChrToHex(*pbBuf++);
514	cbBuf--;
515	}
516
517	*puVal = uVal;
518
519	if (ppbSep)
520	*ppbSep = pbBuf;
521
522	return VINF_SUCCESS;
523	}
524
525
526	/**
527	* Decodes the given ASCII hexstring as a byte buffer up until the given separator is found or the end of the string is reached.
528	*
529	* @returns Status code.
530	* @param pbBuf The buffer containing the hexstring to convert.
531	* @param cbBuf Size of the buffer in bytes.
532	* @param pvDst Where to store the decoded data.
533	* @param cbDst Maximum buffer size in bytes.
534	* @param pcbDecoded Where to store the number of consumed bytes from the input.
535	*/
536	DECLINLINE(int) dbgcGdbStubCtxParseHexStringAsByteBuf(const uint8_t pbBuf, size_t cbBuf, void pvDst, size_t cbDst, size_t *pcbDecoded)
537	{
538	size_t cbDecode = RT_MIN(cbBuf, cbDst * 2);
539
540	if (pcbDecoded)
541	*pcbDecoded = cbDecode;
542
543	return RTStrConvertHexBytes((const char )pbBuf, pvDst, cbDecode, 0 / fFlags*/);
544	}
545
546	#if 0 /unused for now/
547	/**
548	* Sends a 'OK' part of a reply packet only (packet start and end needs to be handled separately).
549	*
550	* @returns Status code.
551	* @param pThis The GDB stub context.
552	*/
553	static int dbgcGdbStubCtxReplySendOkData(PGDBSTUBCTX pThis)
554	{
555	char achOk[2] = { 'O', 'K' };
556	return dbgcGdbStubCtxReplySendData(pThis, &achOk[0], sizeof(achOk));
557	}
558	#endif
559
560
561	/**
562	* Sends a 'OK' reply packet.
563	*
564	* @returns Status code.
565	* @param pThis The GDB stub context.
566	*/
567	static int dbgcGdbStubCtxReplySendOk(PGDBSTUBCTX pThis)
568	{
569	char achOk[2] = { 'O', 'K' };
570	return dbgcGdbStubCtxReplySend(pThis, &achOk[0], sizeof(achOk));
571	}
572
573	#if 0 /unused for now/
574	/**
575	* Sends a 'E NN' part of a reply packet only (packet start and end needs to be handled separately).
576	*
577	* @returns Status code.
578	* @param pThis The GDB stub context.
579	* @param uErr The error code to send.
580	*/
581	static int dbgcGdbStubCtxReplySendErrData(PGDBSTUBCTX pThis, uint8_t uErr)
582	{
583	char achErr[3] = { 'E', 0, 0 };
584	achErr[1] = dbgcGdbStubCtxHexToChr(uErr >> 4);
585	achErr[2] = dbgcGdbStubCtxHexToChr(uErr & 0xf);
586	return dbgcGdbStubCtxReplySendData(pThis, &achErr[0], sizeof(achErr));
587	}
588	#endif
589
590	/**
591	* Sends a 'E NN' reply packet.
592	*
593	* @returns Status code.
594	* @param pThis The GDB stub context.
595	* @param uErr The error code to send.
596	*/
597	static int dbgcGdbStubCtxReplySendErr(PGDBSTUBCTX pThis, uint8_t uErr)
598	{
599	char achErr[3] = { 'E', 0, 0 };
600	achErr[1] = dbgcGdbStubCtxHexToChr(uErr >> 4);
601	achErr[2] = dbgcGdbStubCtxHexToChr(uErr & 0xf);
602	return dbgcGdbStubCtxReplySend(pThis, &achErr[0], sizeof(achErr));
603	}
604
605
606	/**
607	* Sends a signal trap (S 05) packet to indicate that the target has stopped.
608	*
609	* @returns Status code.
610	* @param pThis The GDB stub context.
611	*/
612	static int dbgcGdbStubCtxReplySendSigTrap(PGDBSTUBCTX pThis)
613	{
614	char achReply[32];
615	ssize_t cchStr = RTStrPrintf2(&achReply[0], sizeof(achReply), "T05thread:%02x;", pThis->Dbgc.idCpu + 1);
616	return dbgcGdbStubCtxReplySend(pThis, &achReply[0], cchStr);
617	}
618
619
620	/**
621	* Sends a GDB stub status code indicating an error using the error reply packet.
622	*
623	* @returns Status code.
624	* @param pThis The GDB stub context.
625	* @param rc The status code to send.
626	*/
627	static int dbgcGdbStubCtxReplySendErrSts(PGDBSTUBCTX pThis, int rc)
628	{
629	/** @todo convert error codes maybe. */
630	return dbgcGdbStubCtxReplySendErr(pThis, (-rc) & 0xff);
631	}
632
633
634	/**
635	* Ensures that there is at least the given amount of bytes of free space left in the packet buffer.
636	*
637	* @returns Status code (error when increasing the buffer failed).
638	* @param pThis The GDB stub context.
639	* @param cbSpace Number of bytes required.
640	*/
641	static int dbgcGdbStubCtxEnsurePktBufSpace(PGDBSTUBCTX pThis, size_t cbSpace)
642	{
643	if (pThis->cbPktBufMax - pThis->offPktBuf >= cbSpace)
644	return VINF_SUCCESS;
645
646	/* Slow path allocate new buffer and copy content over. */
647	int rc = VINF_SUCCESS;
648	size_t cbPktBufMaxNew = pThis->cbPktBufMax + cbSpace;
649	void *pvNew = RTMemRealloc(pThis->pbPktBuf, cbPktBufMaxNew);
650	if (pvNew)
651	{
652	pThis->pbPktBuf = (uint8_t *)pvNew;
653	pThis->cbPktBufMax = cbPktBufMaxNew;
654	}
655	else
656	rc = VERR_NO_MEMORY;
657
658	return rc;
659	}
660
661
662	/**
663	* Parses the arguments of a 'Z' and 'z' packet.
664	*
665	* @returns Status code.
666	* @param pbArgs Pointer to the start of the first argument.
667	* @param cbArgs Number of argument bytes.
668	* @param penmTpType Where to store the tracepoint type on success.
669	* @param pGdbTgtAddr Where to store the address on success.
670	* @param puKind Where to store the kind argument on success.
671	*/
672	static int dbgcGdbStubCtxParseTpPktArgs(const uint8_t pbArgs, size_t cbArgs, GDBSTUBTPTYPE penmTpType, uint64_t pGdbTgtAddr, uint64_t puKind)
673	{
674	const uint8_t *pbPktSep = NULL;
675	uint64_t uType = 0;
676
677	int rc = dbgcGdbStubCtxParseHexStringAsInteger(pbArgs, cbArgs, &uType,
678	',', &pbPktSep);
679	if (RT_SUCCESS(rc))
680	{
681	cbArgs -= (uintptr_t)(pbPktSep - pbArgs) - 1;
682	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, cbArgs, pGdbTgtAddr,
683	',', &pbPktSep);
684	if (RT_SUCCESS(rc))
685	{
686	cbArgs -= (uintptr_t)(pbPktSep - pbArgs) - 1;
687	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, cbArgs, puKind,
688	GDBSTUB_PKT_END, NULL);
689	if (RT_SUCCESS(rc))
690	{
691	switch (uType)
692	{
693	case 0:
694	*penmTpType = GDBSTUBTPTYPE_EXEC_SW;
695	break;
696	case 1:
697	*penmTpType = GDBSTUBTPTYPE_EXEC_HW;
698	break;
699	case 2:
700	*penmTpType = GDBSTUBTPTYPE_MEM_WRITE;
701	break;
702	case 3:
703	*penmTpType = GDBSTUBTPTYPE_MEM_READ;
704	break;
705	case 4:
706	*penmTpType = GDBSTUBTPTYPE_MEM_ACCESS;
707	break;
708	default:
709	rc = VERR_INVALID_PARAMETER;
710	break;
711	}
712	}
713	}
714	}
715
716	return rc;
717	}
718
719
720	/**
721	* Processes the 'TStatus' query.
722	*
723	* @returns Status code.
724	* @param pThis The GDB stub context.
725	* @param pbArgs Pointer to the start of the arguments in the packet.
726	* @param cbArgs Size of arguments in bytes.
727	*/
728	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryTStatus(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
729	{
730	RT_NOREF(pbArgs, cbArgs);
731
732	char achReply[2] = { 'T', '0' };
733	return dbgcGdbStubCtxReplySend(pThis, &achReply[0], sizeof(achReply));
734	}
735
736
737	/**
738	* @copydoc FNGDBSTUBQPKTPROC
739	*/
740	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessFeatXmlRegs(PGDBSTUBCTX pThis, const uint8_t *pbVal, size_t cbVal)
741	{
742	/*
743	* xmlRegisters contain a list of supported architectures delimited by ','.
744	* Check that the architecture is in the supported list.
745	*/
746	while (cbVal)
747	{
748	/* Find the next delimiter. */
749	size_t cbThisVal = cbVal;
750	const uint8_t pbDelim = (const uint8_t )memchr(pbVal, ',', cbVal);
751	if (pbDelim)
752	cbThisVal = pbDelim - pbVal;
753
754	const size_t cchArch64 = sizeof("i386:x86-64") - 1;
755	const size_t cchArch32 = sizeof("i386") - 1;
756	if ( !memcmp(pbVal, "i386:x86-64", RT_MIN(cbVal, cchArch64))
757	\|\| !memcmp(pbVal, "i386", RT_MIN(cbVal, cchArch32)))
758	{
759	/* Set the flag to support the qXfer:features:read packet. */
760	pThis->fFeatures \|= GDBSTUBCTX_FEATURES_F_TGT_DESC;
761	break;
762	}
763
764	cbVal -= cbThisVal + (pbDelim ? 1 : 0);
765	pbVal = pbDelim + (pbDelim ? 1 : 0);
766	}
767
768	return VINF_SUCCESS;
769	}
770
771
772	/**
773	* Features which can be reported by the remote GDB which we might support.
774	*
775	* @note The sorting matters for features which start the same, the longest must come first.
776	*/
777	static const GDBSTUBFEATDESC g_aGdbFeatures[] =
778	{
779	#define GDBSTUBFEATDESC_INIT(a_Name, a_pfnHnd, a_fVal) { a_Name, sizeof(a_Name) - 1, a_pfnHnd, a_fVal }
780	GDBSTUBFEATDESC_INIT("xmlRegisters", dbgcGdbStubCtxPktProcessFeatXmlRegs, true),
781	#undef GDBSTUBFEATDESC_INIT
782	};
783
784
785	/**
786	* Calculates the feature length of the next feature pointed to by the given arguments buffer.
787	*
788	* @returns Status code.
789	* @param pbArgs Pointer to the start of the arguments in the packet.
790	* @param cbArgs Size of arguments in bytes.
791	* @param pcbArg Where to store the size of the argument in bytes on success (excluding the delimiter).
792	* @param pfTerminator Whereto store the flag whether the packet terminator (#) was seen as a delimiter.
793	*/
794	static int dbgcGdbStubCtxQueryPktQueryFeatureLen(const uint8_t pbArgs, size_t cbArgs, size_t pcbArg, bool *pfTerminator)
795	{
796	const uint8_t *pbArgCur = pbArgs;
797
798	while ( cbArgs
799	&& *pbArgCur != ';'
800	&& *pbArgCur != GDBSTUB_PKT_END)
801	{
802	cbArgs--;
803	pbArgCur++;
804	}
805
806	if ( !cbArgs
807	&& *pbArgCur != ';'
808	&& *pbArgCur != GDBSTUB_PKT_END)
809	return VERR_NET_PROTOCOL_ERROR;
810
811	*pcbArg = pbArgCur - pbArgs;
812	pfTerminator = pbArgCur == GDBSTUB_PKT_END ? true : false;
813
814	return VINF_SUCCESS;
815	}
816
817
818	/**
819	* Sends the reply to the 'qSupported' packet.
820	*
821	* @returns Status code.
822	* @param pThis The GDB stub context.
823	*/
824	static int dbgcGdbStubCtxPktProcessQuerySupportedReply(PGDBSTUBCTX pThis)
825	{
826	/** @todo Enhance. */
827	if (pThis->fFeatures & GDBSTUBCTX_FEATURES_F_TGT_DESC)
828	return dbgcGdbStubCtxReplySend(pThis, "qXfer:features:read+;vContSupported+", sizeof("qXfer:features:read+;vContSupported+") - 1);
829
830	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
831	}
832
833
834	/**
835	* Processes the 'Supported' query.
836	*
837	* @returns Status code.
838	* @param pThis The GDB stub context.
839	* @param pbArgs Pointer to the start of the arguments in the packet.
840	* @param cbArgs Size of arguments in bytes.
841	*/
842	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQuerySupported(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
843	{
844	/* Skip the : following the qSupported start. */
845	if ( cbArgs < 1
846	\|\| pbArgs[0] != ':')
847	return VERR_NET_PROTOCOL_ERROR;
848
849	cbArgs--;
850	pbArgs++;
851
852	/*
853	* Each feature but the last one are separated by ; and the last one is delimited by the # packet end symbol.
854	* We first determine the boundaries of the reported feature and pass it to the appropriate handler.
855	*/
856	int rc = VINF_SUCCESS;
857	while ( cbArgs
858	&& RT_SUCCESS(rc))
859	{
860	bool fTerminator = false;
861	size_t cbArg = 0;
862	rc = dbgcGdbStubCtxQueryPktQueryFeatureLen(pbArgs, cbArgs, &cbArg, &fTerminator);
863	if (RT_SUCCESS(rc))
864	{
865	/* Search for the feature handler. */
866	for (uint32_t i = 0; i < RT_ELEMENTS(g_aGdbFeatures); i++)
867	{
868	PCGDBSTUBFEATDESC pFeatDesc = &g_aGdbFeatures[i];
869
870	if ( cbArg > pFeatDesc->cchName /* At least one character must come after the feature name ('+', '-' or '='). */
871	&& !memcmp(pFeatDesc->pszName, pbArgs, pFeatDesc->cchName))
872	{
873	/* Found, execute handler after figuring out whether there is a value attached. */
874	const uint8_t *pbVal = pbArgs + pFeatDesc->cchName;
875	size_t cbVal = cbArg - pFeatDesc->cchName;
876
877	if (pFeatDesc->fVal)
878	{
879	if ( *pbVal == '='
880	&& cbVal > 1)
881	{
882	pbVal++;
883	cbVal--;
884	}
885	else
886	rc = VERR_NET_PROTOCOL_ERROR;
887	}
888	else if ( cbVal != 1
889	\|\| ( *pbVal != '+'
890	&& pbVal != '-')) / '+' and '-' are allowed to indicate support for a particular feature. */
891	rc = VERR_NET_PROTOCOL_ERROR;
892
893	if (RT_SUCCESS(rc))
894	rc = pFeatDesc->pfnHandler(pThis, pbVal, cbVal);
895	break;
896	}
897	}
898
899	cbArgs -= cbArg;
900	pbArgs += cbArg;
901	if (!fTerminator)
902	{
903	cbArgs--;
904	pbArgs++;
905	}
906	else
907	break;
908	}
909	}
910
911	/* If everything went alright send the reply with our supported features. */
912	if (RT_SUCCESS(rc))
913	rc = dbgcGdbStubCtxPktProcessQuerySupportedReply(pThis);
914
915	return rc;
916	}
917
918
919	/**
920	* Sends the reply to a 'qXfer:object:read:...' request.
921	*
922	* @returns Status code.
923	* @param pThis The GDB stub context.
924	* @param offRead Where to start reading from within the object.
925	* @param cbRead How much to read.
926	* @param pbObj The start of the object.
927	* @param cbObj Size of the object.
928	*/
929	static int dbgcGdbStubCtxQueryXferReadReply(PGDBSTUBCTX pThis, uint32_t offRead, size_t cbRead, const uint8_t *pbObj, size_t cbObj)
930	{
931	int rc = VINF_SUCCESS;
932	if (offRead < cbObj)
933	{
934	/** @todo Escaping */
935	size_t cbThisRead = offRead + cbRead < cbObj ? cbRead : cbObj - offRead;
936
937	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbThisRead + 1);
938	if (RT_SUCCESS(rc))
939	{
940	uint8_t *pbPktBuf = pThis->pbPktBuf;
941	*pbPktBuf++ = cbThisRead < cbRead ? 'l' : 'm';
942	memcpy(pbPktBuf, pbObj + offRead, cbThisRead);
943	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbThisRead + 1);
944	}
945	else
946	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NO_MEMORY);
947	}
948	else if (offRead == cbObj)
949	rc = dbgcGdbStubCtxReplySend(pThis, "l", sizeof("l") - 1);
950	else
951	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
952
953	return rc;
954	}
955
956
957	/**
958	* Parses the annex:offset,length part of a 'qXfer:object:read:...' request.
959	*
960	* @returns Status code.
961	* @param pbArgs Start of the arguments beginning with annex.
962	* @param cbArgs Number of bytes remaining for the arguments.
963	* @param ppchAnnex Where to store the pointer to the beginning of the annex on success.
964	* @param pcchAnnex Where to store the number of characters for the annex on success.
965	* @param poffRead Where to store the offset on success.
966	* @param pcbRead Where to store the length on success.
967	*/
968	static int dbgcGdbStubCtxPktProcessQueryXferParseAnnexOffLen(const uint8_t pbArgs, size_t cbArgs, const char ppchAnnex, size_t pcchAnnex,
969	uint32_t poffRead, size_t pcbRead)
970	{
971	int rc = VINF_SUCCESS;
972	const uint8_t pbSep = (const uint8_t )memchr(pbArgs, ':', cbArgs);
973	if (pbSep)
974	{
975	ppchAnnex = (const char )pbArgs;
976	*pcchAnnex = pbSep - pbArgs;
977
978	pbSep++;
979	cbArgs -= *pcchAnnex + 1;
980
981	uint64_t u64Tmp = 0;
982	const uint8_t *pbLenStart = NULL;
983	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbSep, cbArgs, &u64Tmp, ',', &pbLenStart);
984	if ( RT_SUCCESS(rc)
985	&& (uint32_t)u64Tmp == u64Tmp)
986	{
987	*poffRead = (uint32_t)u64Tmp;
988	cbArgs -= pbLenStart - pbSep;
989
990	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbLenStart + 1, cbArgs, &u64Tmp, '#', &pbLenStart);
991	if ( RT_SUCCESS(rc)
992	&& (size_t)u64Tmp == u64Tmp)
993	*pcbRead = (size_t)u64Tmp;
994	else
995	rc = VERR_NET_PROTOCOL_ERROR;
996	}
997	else
998	rc = VERR_NET_PROTOCOL_ERROR;
999	}
1000	else
1001	rc = VERR_NET_PROTOCOL_ERROR;
1002
1003	return rc;
1004	}
1005
1006
1007	#define DBGREG_DESC_INIT_INT64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "int64", NULL }
1008	#define DBGREG_DESC_INIT_INT32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "int32", NULL }
1009	#define DBGREG_DESC_INIT_DATA_PTR64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "data_ptr", NULL }
1010	#define DBGREG_DESC_INIT_CODE_PTR64(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 64, "code_ptr", NULL }
1011	#define DBGREG_DESC_INIT_DATA_PTR32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "data_ptr", NULL }
1012	#define DBGREG_DESC_INIT_CODE_PTR32(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "code_ptr", NULL }
1013	#define DBGREG_DESC_INIT_X87(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 80, "i387_ext", NULL }
1014	#define DBGREG_DESC_INIT_X87_CTRL(a_Name, a_enmDbgfReg) { a_Name, a_enmDbgfReg, 32, "int", "float" }
1015
1016
1017	/**
1018	* amd64 GDB register set.
1019	*/
1020	static const GDBREGDESC g_aGdbRegs64[] =
1021	{
1022	DBGREG_DESC_INIT_INT64( "rax", DBGFREG_RAX),
1023	DBGREG_DESC_INIT_INT64( "rbx", DBGFREG_RBX),
1024	DBGREG_DESC_INIT_INT64( "rcx", DBGFREG_RCX),
1025	DBGREG_DESC_INIT_INT64( "rdx", DBGFREG_RDX),
1026	DBGREG_DESC_INIT_INT64( "rsi", DBGFREG_RSI),
1027	DBGREG_DESC_INIT_INT64( "rdi", DBGFREG_RDI),
1028	DBGREG_DESC_INIT_DATA_PTR64("rbp", DBGFREG_RBP),
1029	DBGREG_DESC_INIT_DATA_PTR64("rsp", DBGFREG_RSP),
1030	DBGREG_DESC_INIT_INT64( "r8", DBGFREG_R8),
1031	DBGREG_DESC_INIT_INT64( "r9", DBGFREG_R9),
1032	DBGREG_DESC_INIT_INT64( "r10", DBGFREG_R10),
1033	DBGREG_DESC_INIT_INT64( "r11", DBGFREG_R11),
1034	DBGREG_DESC_INIT_INT64( "r12", DBGFREG_R12),
1035	DBGREG_DESC_INIT_INT64( "r13", DBGFREG_R13),
1036	DBGREG_DESC_INIT_INT64( "r14", DBGFREG_R14),
1037	DBGREG_DESC_INIT_INT64( "r15", DBGFREG_R15),
1038	DBGREG_DESC_INIT_CODE_PTR64("rip", DBGFREG_RIP),
1039	DBGREG_DESC_INIT_INT32( "eflags", DBGFREG_FLAGS),
1040	DBGREG_DESC_INIT_INT32( "cs", DBGFREG_CS),
1041	DBGREG_DESC_INIT_INT32( "ss", DBGFREG_SS),
1042	DBGREG_DESC_INIT_INT32( "ds", DBGFREG_DS),
1043	DBGREG_DESC_INIT_INT32( "es", DBGFREG_ES),
1044	DBGREG_DESC_INIT_INT32( "fs", DBGFREG_FS),
1045	DBGREG_DESC_INIT_INT32( "gs", DBGFREG_GS),
1046
1047	DBGREG_DESC_INIT_X87( "st0", DBGFREG_ST0),
1048	DBGREG_DESC_INIT_X87( "st1", DBGFREG_ST1),
1049	DBGREG_DESC_INIT_X87( "st2", DBGFREG_ST2),
1050	DBGREG_DESC_INIT_X87( "st3", DBGFREG_ST3),
1051	DBGREG_DESC_INIT_X87( "st4", DBGFREG_ST4),
1052	DBGREG_DESC_INIT_X87( "st5", DBGFREG_ST5),
1053	DBGREG_DESC_INIT_X87( "st6", DBGFREG_ST6),
1054	DBGREG_DESC_INIT_X87( "st7", DBGFREG_ST7),
1055
1056	DBGREG_DESC_INIT_X87_CTRL( "fctrl", DBGFREG_FCW),
1057	DBGREG_DESC_INIT_X87_CTRL( "fstat", DBGFREG_FSW),
1058	DBGREG_DESC_INIT_X87_CTRL( "ftag", DBGFREG_FTW),
1059	DBGREG_DESC_INIT_X87_CTRL( "fop", DBGFREG_FOP),
1060	DBGREG_DESC_INIT_X87_CTRL( "fioff", DBGFREG_FPUIP),
1061	DBGREG_DESC_INIT_X87_CTRL( "fiseg", DBGFREG_FPUCS),
1062	DBGREG_DESC_INIT_X87_CTRL( "fooff", DBGFREG_FPUDP),
1063	DBGREG_DESC_INIT_X87_CTRL( "foseg", DBGFREG_FPUDS)
1064	};
1065
1066
1067	/**
1068	* i386 GDB register set.
1069	*/
1070	static const GDBREGDESC g_aGdbRegs32[] =
1071	{
1072	DBGREG_DESC_INIT_INT32( "eax", DBGFREG_EAX),
1073	DBGREG_DESC_INIT_INT32( "ebx", DBGFREG_EBX),
1074	DBGREG_DESC_INIT_INT32( "ecx", DBGFREG_ECX),
1075	DBGREG_DESC_INIT_INT32( "edx", DBGFREG_EDX),
1076	DBGREG_DESC_INIT_INT32( "esi", DBGFREG_ESI),
1077	DBGREG_DESC_INIT_INT32( "edi", DBGFREG_EDI),
1078	DBGREG_DESC_INIT_DATA_PTR32("ebp", DBGFREG_EBP),
1079	DBGREG_DESC_INIT_DATA_PTR32("esp", DBGFREG_ESP),
1080	DBGREG_DESC_INIT_CODE_PTR32("eip", DBGFREG_EIP),
1081	DBGREG_DESC_INIT_INT32( "eflags", DBGFREG_FLAGS),
1082	DBGREG_DESC_INIT_INT32( "cs", DBGFREG_CS),
1083	DBGREG_DESC_INIT_INT32( "ss", DBGFREG_SS),
1084	DBGREG_DESC_INIT_INT32( "ds", DBGFREG_DS),
1085	DBGREG_DESC_INIT_INT32( "es", DBGFREG_ES),
1086	DBGREG_DESC_INIT_INT32( "fs", DBGFREG_FS),
1087	DBGREG_DESC_INIT_INT32( "gs", DBGFREG_GS),
1088
1089	DBGREG_DESC_INIT_X87( "st0", DBGFREG_ST0),
1090	DBGREG_DESC_INIT_X87( "st1", DBGFREG_ST1),
1091	DBGREG_DESC_INIT_X87( "st2", DBGFREG_ST2),
1092	DBGREG_DESC_INIT_X87( "st3", DBGFREG_ST3),
1093	DBGREG_DESC_INIT_X87( "st4", DBGFREG_ST4),
1094	DBGREG_DESC_INIT_X87( "st5", DBGFREG_ST5),
1095	DBGREG_DESC_INIT_X87( "st6", DBGFREG_ST6),
1096	DBGREG_DESC_INIT_X87( "st7", DBGFREG_ST7),
1097
1098	DBGREG_DESC_INIT_X87_CTRL( "fctrl", DBGFREG_FCW),
1099	DBGREG_DESC_INIT_X87_CTRL( "fstat", DBGFREG_FSW),
1100	DBGREG_DESC_INIT_X87_CTRL( "ftag", DBGFREG_FTW),
1101	DBGREG_DESC_INIT_X87_CTRL( "fop", DBGFREG_FOP),
1102	DBGREG_DESC_INIT_X87_CTRL( "fioff", DBGFREG_FPUIP),
1103	DBGREG_DESC_INIT_X87_CTRL( "fiseg", DBGFREG_FPUCS),
1104	DBGREG_DESC_INIT_X87_CTRL( "fooff", DBGFREG_FPUDP),
1105	DBGREG_DESC_INIT_X87_CTRL( "foseg", DBGFREG_FPUDS)
1106	};
1107
1108	#undef DBGREG_DESC_INIT_CODE_PTR64
1109	#undef DBGREG_DESC_INIT_DATA_PTR64
1110	#undef DBGREG_DESC_INIT_CODE_PTR32
1111	#undef DBGREG_DESC_INIT_DATA_PTR32
1112	#undef DBGREG_DESC_INIT_INT32
1113	#undef DBGREG_DESC_INIT_INT64
1114	#undef DBGREG_DESC_INIT_X87
1115	#undef DBGREG_DESC_INIT_X87_CTRL
1116
1117
1118	/**
1119	* Creates the target XML description.
1120	*
1121	* @returns Status code.
1122	* @param pThis The GDB stub context.
1123	*/
1124	static int dbgcGdbStubCtxTgtXmlDescCreate(PGDBSTUBCTX pThis)
1125	{
1126	static const char s_szXmlTgtHdr64[] =
1127	"<?xml version=\"1.0\"?>\n"
1128	"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
1129	"<target version=\"1.0\">\n"
1130	" <architecture>i386:x86-64</architecture>\n"
1131	" <feature name=\"org.gnu.gdb.i386.core\">\n";
1132	static const char s_szXmlTgtHdr32[] =
1133	"<?xml version=\"1.0\"?>\n"
1134	"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">\n"
1135	"<target version=\"1.0\">\n"
1136	" <architecture>i386</architecture>\n"
1137	" <feature name=\"org.gnu.gdb.i386.core\">\n";
1138	static const char s_szXmlTgtFooter[] =
1139	" </feature>\n"
1140	"</target>\n";
1141
1142	int rc = VINF_SUCCESS;
1143
1144	pThis->pachTgtXmlDesc = (char *)RTStrAlloc(_32K);
1145	if (pThis->pachTgtXmlDesc)
1146	{
1147	size_t cbLeft = _32K;
1148	char *pachXmlCur = pThis->pachTgtXmlDesc;
1149	pThis->cbTgtXmlDesc = cbLeft;
1150
1151	rc = RTStrCatP(&pachXmlCur, &cbLeft, pThis->paRegs == &g_aGdbRegs64[0] ? &s_szXmlTgtHdr64[0] : &s_szXmlTgtHdr32[0]);
1152	if (RT_SUCCESS(rc))
1153	{
1154	/* Register */
1155	for (uint32_t i = 0; i < pThis->cRegs && RT_SUCCESS(rc); i++)
1156	{
1157	const struct GDBREGDESC *pReg = &pThis->paRegs[i];
1158
1159	ssize_t cchStr = 0;
1160	if (pReg->pszGroup)
1161	cchStr = RTStrPrintf2(pachXmlCur, cbLeft,
1162	"<reg name=\"%s\" bitsize=\"%u\" regnum=\"%u\" type=\"%s\" group=\"%s\"/>\n",
1163	pReg->pszName, pReg->cBits, i, pReg->pszType, pReg->pszGroup);
1164	else
1165	cchStr = RTStrPrintf2(pachXmlCur, cbLeft,
1166	"<reg name=\"%s\" bitsize=\"%u\" regnum=\"%u\" type=\"%s\"/>\n",
1167	pReg->pszName, pReg->cBits, i, pReg->pszType);
1168
1169	if (cchStr > 0)
1170	{
1171	pachXmlCur += cchStr;
1172	cbLeft -= cchStr;
1173	}
1174	else
1175	rc = VERR_BUFFER_OVERFLOW;
1176	}
1177	}
1178
1179	if (RT_SUCCESS(rc))
1180	rc = RTStrCatP(&pachXmlCur, &cbLeft, &s_szXmlTgtFooter[0]);
1181
1182	pThis->cbTgtXmlDesc -= cbLeft;
1183	}
1184	else
1185	rc = VERR_NO_MEMORY;
1186
1187	return rc;
1188	}
1189
1190
1191	/**
1192	* Returns the GDB register descriptor describing the given DBGF register enum.
1193	*
1194	* @returns Pointer to the GDB register descriptor or NULL if not found.
1195	* @param pThis The GDB stub context.
1196	* @param idxReg The register to look for.
1197	*/
1198	static const GDBREGDESC *dbgcGdbStubRegGet(PGDBSTUBCTX pThis, uint32_t idxReg)
1199	{
1200	if (RT_LIKELY(idxReg < pThis->cRegs))
1201	return &pThis->paRegs[idxReg];
1202
1203	return NULL;
1204	}
1205
1206
1207	/**
1208	* Processes the 'C' query (query current thread ID).
1209	*
1210	* @returns Status code.
1211	* @param pThis The GDB stub context.
1212	* @param pbArgs Pointer to the start of the arguments in the packet.
1213	* @param cbArgs Size of arguments in bytes.
1214	*/
1215	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadId(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1216	{
1217	RT_NOREF(pbArgs, cbArgs);
1218
1219	int rc = VERR_BUFFER_OVERFLOW;
1220	char achReply[32];
1221	ssize_t cchStr = RTStrPrintf(&achReply[0], sizeof(achReply), "QC %02x", pThis->Dbgc.idCpu + 1);
1222	if (cchStr > 0)
1223	rc = dbgcGdbStubCtxReplySend(pThis, &achReply[0], cchStr);
1224
1225	return rc;
1226	}
1227
1228
1229	/**
1230	* Processes the 'Attached' query.
1231	*
1232	* @returns Status code.
1233	* @param pThis The GDB stub context.
1234	* @param pbArgs Pointer to the start of the arguments in the packet.
1235	* @param cbArgs Size of arguments in bytes.
1236	*/
1237	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryAttached(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1238	{
1239	RT_NOREF(pbArgs, cbArgs);
1240
1241	/* We always report attached so that the VM doesn't get killed when GDB quits. */
1242	uint8_t bAttached = '1';
1243	return dbgcGdbStubCtxReplySend(pThis, &bAttached, sizeof(bAttached));
1244	}
1245
1246
1247	/**
1248	* Processes the 'Xfer:features:read' query.
1249	*
1250	* @returns Status code.
1251	* @param pThis The GDB stub context.
1252	* @param pbArgs Pointer to the start of the arguments in the packet.
1253	* @param cbArgs Size of arguments in bytes.
1254	*/
1255	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryXferFeatRead(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1256	{
1257	/* Skip the : following the Xfer:features:read start. */
1258	if ( cbArgs < 1
1259	\|\| pbArgs[0] != ':')
1260	return VERR_NET_PROTOCOL_ERROR;
1261
1262	cbArgs--;
1263	pbArgs++;
1264
1265	int rc = VINF_SUCCESS;
1266	if (pThis->fFeatures & GDBSTUBCTX_FEATURES_F_TGT_DESC)
1267	{
1268	/* Create the target XML description if not existing. */
1269	if (!pThis->pachTgtXmlDesc)
1270	rc = dbgcGdbStubCtxTgtXmlDescCreate(pThis);
1271
1272	if (RT_SUCCESS(rc))
1273	{
1274	/* Parse annex, offset and length and return the data. */
1275	const char *pchAnnex = NULL;
1276	size_t cchAnnex = 0;
1277	uint32_t offRead = 0;
1278	size_t cbRead = 0;
1279
1280	rc = dbgcGdbStubCtxPktProcessQueryXferParseAnnexOffLen(pbArgs, cbArgs,
1281	&pchAnnex, &cchAnnex,
1282	&offRead, &cbRead);
1283	if (RT_SUCCESS(rc))
1284	{
1285	/* Check whether the annex is supported. */
1286	if ( cchAnnex == sizeof("target.xml") - 1
1287	&& !memcmp(pchAnnex, "target.xml", cchAnnex))
1288	rc = dbgcGdbStubCtxQueryXferReadReply(pThis, offRead, cbRead, (const uint8_t *)pThis->pachTgtXmlDesc,
1289	pThis->cbTgtXmlDesc);
1290	else
1291	rc = dbgcGdbStubCtxReplySendErr(pThis, 0);
1292	}
1293	else
1294	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1295	}
1296	else
1297	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1298	}
1299	else
1300	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0); /* Not supported. */
1301
1302	return rc;
1303	}
1304
1305
1306	/**
1307	* Processes the 'Rcmd' query.
1308	*
1309	* @returns Status code.
1310	* @param pThis The GDB stub context.
1311	* @param pbArgs Pointer to the start of the arguments in the packet.
1312	* @param cbArgs Size of arguments in bytes.
1313	*/
1314	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryRcmd(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1315	{
1316	/* Skip the , following the qRcmd start. */
1317	if ( cbArgs < 1
1318	\|\| pbArgs[0] != ',')
1319	return VERR_NET_PROTOCOL_ERROR;
1320
1321	cbArgs--;
1322	pbArgs++;
1323
1324	/* Decode the command. */
1325	/** @todo Make this dynamic. */
1326	char szCmd[_4K];
1327	RT_ZERO(szCmd);
1328
1329	if (cbArgs / 2 >= sizeof(szCmd))
1330	return VERR_NET_PROTOCOL_ERROR;
1331
1332	size_t cbDecoded = 0;
1333	int rc = RTStrConvertHexBytesEx((const char )pbArgs, &szCmd[0], sizeof(szCmd), 0 /fFlags*/,
1334	NULL /* ppszNext */, &cbDecoded);
1335	if (rc == VWRN_TRAILING_CHARS)
1336	rc = VINF_SUCCESS;
1337	if (RT_SUCCESS(rc))
1338	{
1339	szCmd[cbDecoded] = '\0'; /* Ensure zero termination. */
1340
1341	pThis->fOutput = false;
1342	rc = dbgcEvalCommand(&pThis->Dbgc, &szCmd[0], cbDecoded, false /fNoExecute/);
1343	dbgcGdbStubCtxReplySendOk(pThis);
1344	if ( rc != VERR_DBGC_QUIT
1345	&& rc != VWRN_DBGC_CMD_PENDING)
1346	rc = VINF_SUCCESS; /* ignore other statuses */
1347	}
1348
1349	return rc;
1350	}
1351
1352
1353	/**
1354	* Worker for both 'qfThreadInfo' and 'qsThreadInfo'.
1355	*
1356	* @returns VBox status code.
1357	* @param pThis The GDB stub context.
1358	*/
1359	static int dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(PGDBSTUBCTX pThis)
1360	{
1361	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
1362	if (RT_SUCCESS(rc))
1363	{
1364	uint8_t bReplyStart = { 'm' };
1365	rc = dbgcGdbStubCtxReplySendData(pThis, &bReplyStart, sizeof(bReplyStart));
1366	if (RT_SUCCESS(rc))
1367	{
1368	char achReply[32];
1369	ssize_t cchStr = RTStrPrintf(&achReply[0], sizeof(achReply), "%02x", pThis->idCpuNextThrdInfoQuery + 1);
1370	if (cchStr <= 0)
1371	rc = VERR_BUFFER_OVERFLOW;
1372
1373	if (RT_SUCCESS(rc))
1374	rc = dbgcGdbStubCtxReplySendData(pThis, &achReply[0], cchStr);
1375	pThis->idCpuNextThrdInfoQuery++;
1376	}
1377
1378	rc = dbgcGdbStubCtxReplySendEnd(pThis);
1379	}
1380
1381	return rc;
1382	}
1383
1384
1385	/**
1386	* Processes the 'fThreadInfo' query.
1387	*
1388	* @returns Status code.
1389	* @param pThis The GDB stub context.
1390	* @param pbArgs Pointer to the start of the arguments in the packet.
1391	* @param cbArgs Size of arguments in bytes.
1392	*/
1393	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadInfoStart(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1394	{
1395	RT_NOREF(pbArgs, cbArgs);
1396
1397	pThis->idCpuNextThrdInfoQuery = 0;
1398	pThis->fInThrdInfoQuery = true;
1399	return dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(pThis);
1400	}
1401
1402
1403	/**
1404	* Processes the 'fThreadInfo' query.
1405	*
1406	* @returns Status code.
1407	* @param pThis The GDB stub context.
1408	* @param pbArgs Pointer to the start of the arguments in the packet.
1409	* @param cbArgs Size of arguments in bytes.
1410	*/
1411	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadInfoCont(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1412	{
1413	RT_NOREF(pbArgs, cbArgs);
1414
1415	/* If we are in a thread info query we just send the end of list specifier (all thread IDs where sent previously already). */
1416	if (!pThis->fInThrdInfoQuery)
1417	return dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1418
1419	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1420	if (pThis->idCpuNextThrdInfoQuery == cCpus)
1421	{
1422	pThis->fInThrdInfoQuery = false;
1423	uint8_t bEoL = 'l';
1424	return dbgcGdbStubCtxReplySend(pThis, &bEoL, sizeof(bEoL));
1425	}
1426
1427	return dbgcGdbStubCtxPktProcessQueryThreadInfoWorker(pThis);
1428	}
1429
1430
1431	/**
1432	* Processes the 'ThreadExtraInfo' query.
1433	*
1434	* @returns Status code.
1435	* @param pThis The GDB stub context.
1436	* @param pbArgs Pointer to the start of the arguments in the packet.
1437	* @param cbArgs Size of arguments in bytes.
1438	*/
1439	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessQueryThreadExtraInfo(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1440	{
1441	/* Skip the , following the qThreadExtraInfo start. */
1442	if ( cbArgs < 1
1443	\|\| pbArgs[0] != ',')
1444	return VERR_NET_PROTOCOL_ERROR;
1445
1446	cbArgs--;
1447	pbArgs++;
1448
1449	/* We know there is an # character denoting the end so the following must return with VWRN_TRAILING_CHARS. */
1450	VMCPUID idCpu;
1451	int rc = RTStrToUInt32Ex((const char )pbArgs, NULL /ppszNext*/, 16, &idCpu);
1452	if ( rc == VWRN_TRAILING_CHARS
1453	&& idCpu > 0)
1454	{
1455	idCpu--;
1456
1457	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1458	if (idCpu < cCpus)
1459	{
1460	const char *pszCpuState = DBGFR3CpuGetState(pThis->Dbgc.pUVM, idCpu);
1461	size_t cchCpuState = strlen(pszCpuState);
1462
1463	if (!pszCpuState)
1464	pszCpuState = "DBGFR3CpuGetState() -> NULL";
1465
1466	rc = dbgcGdbStubCtxReplySendBegin(pThis);
1467	if (RT_SUCCESS(rc))
1468	{
1469	/* Convert the characters to hex. */
1470	const char *pachCur = pszCpuState;
1471
1472	while ( cchCpuState
1473	&& RT_SUCCESS(rc))
1474	{
1475	uint8_t achHex[512 + 1];
1476	size_t cbThisSend = RT_MIN((sizeof(achHex) - 1) / 2, cchCpuState); /* Each character needs two bytes. */
1477
1478	rc = dbgcGdbStubCtxEncodeBinaryAsHex(&achHex[0], cbThisSend * 2 + 1, pachCur, cbThisSend);
1479	if (RT_SUCCESS(rc))
1480	rc = dbgcGdbStubCtxReplySendData(pThis, &achHex[0], cbThisSend * 2);
1481
1482	pachCur += cbThisSend;
1483	cchCpuState -= cbThisSend;
1484	}
1485
1486	dbgcGdbStubCtxReplySendEnd(pThis);
1487	}
1488	}
1489	else
1490	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1491	}
1492	else if ( RT_SUCCESS(rc)
1493	\|\| !idCpu)
1494	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1495
1496	return rc;
1497	}
1498
1499
1500	/**
1501	* List of supported query packets.
1502	*/
1503	static const GDBSTUBQPKTPROC g_aQPktProcs[] =
1504	{
1505	#define GDBSTUBQPKTPROC_INIT(a_Name, a_pfnProc) { a_Name, sizeof(a_Name) - 1, a_pfnProc }
1506	GDBSTUBQPKTPROC_INIT("C", dbgcGdbStubCtxPktProcessQueryThreadId),
1507	GDBSTUBQPKTPROC_INIT("Attached", dbgcGdbStubCtxPktProcessQueryAttached),
1508	GDBSTUBQPKTPROC_INIT("TStatus", dbgcGdbStubCtxPktProcessQueryTStatus),
1509	GDBSTUBQPKTPROC_INIT("Supported", dbgcGdbStubCtxPktProcessQuerySupported),
1510	GDBSTUBQPKTPROC_INIT("Xfer:features:read", dbgcGdbStubCtxPktProcessQueryXferFeatRead),
1511	GDBSTUBQPKTPROC_INIT("Rcmd", dbgcGdbStubCtxPktProcessQueryRcmd),
1512	GDBSTUBQPKTPROC_INIT("fThreadInfo", dbgcGdbStubCtxPktProcessQueryThreadInfoStart),
1513	GDBSTUBQPKTPROC_INIT("sThreadInfo", dbgcGdbStubCtxPktProcessQueryThreadInfoCont),
1514	GDBSTUBQPKTPROC_INIT("ThreadExtraInfo", dbgcGdbStubCtxPktProcessQueryThreadExtraInfo),
1515	#undef GDBSTUBQPKTPROC_INIT
1516	};
1517
1518
1519	/**
1520	* Processes a 'q' packet, sending the appropriate reply.
1521	*
1522	* @returns Status code.
1523	* @param pThis The GDB stub context.
1524	* @param pbQuery The query packet data (without the 'q').
1525	* @param cbQuery Size of the remaining query packet in bytes.
1526	*/
1527	static int dbgcGdbStubCtxPktProcessQuery(PGDBSTUBCTX pThis, const uint8_t *pbQuery, size_t cbQuery)
1528	{
1529	/* Search the query and execute the processor or return an empty reply if not supported. */
1530	for (uint32_t i = 0; i < RT_ELEMENTS(g_aQPktProcs); i++)
1531	{
1532	size_t cbCmp = g_aQPktProcs[i].cchName < cbQuery ? g_aQPktProcs[i].cchName : cbQuery;
1533
1534	if (!memcmp(pbQuery, g_aQPktProcs[i].pszName, cbCmp))
1535	return g_aQPktProcs[i].pfnProc(pThis, pbQuery + cbCmp, cbQuery - cbCmp);
1536	}
1537
1538	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1539	}
1540
1541
1542	/**
1543	* Processes a 'vCont[;action[:thread-id]]' packet.
1544	*
1545	* @returns Status code.
1546	* @param pThis The GDB stub context.
1547	* @param pbArgs Pointer to the start of the arguments in the packet.
1548	* @param cbArgs Size of arguments in bytes.
1549	*/
1550	static DECLCALLBACK(int) dbgcGdbStubCtxPktProcessVCont(PGDBSTUBCTX pThis, const uint8_t *pbArgs, size_t cbArgs)
1551	{
1552	int rc = VINF_SUCCESS;
1553
1554	/* Skip the ; following the identifier. */
1555	if ( cbArgs < 2
1556	\|\| pbArgs[0] != ';')
1557	return dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1558
1559	pbArgs++;
1560	cbArgs--;
1561
1562	/** @todo For now we don't care about multiple threads and ignore thread IDs and multiple actions. */
1563	switch (pbArgs[0])
1564	{
1565	case 'c':
1566	{
1567	if (DBGFR3IsHalted(pThis->Dbgc.pUVM))
1568	DBGFR3Resume(pThis->Dbgc.pUVM);
1569	break;
1570	}
1571	case 's':
1572	{
1573	PDBGFADDRESS pStackPop = NULL;
1574	RTGCPTR cbStackPop = 0;
1575	rc = DBGFR3StepEx(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, DBGF_STEP_F_INTO, NULL,
1576	pStackPop, cbStackPop, 1 /cMaxSteps/);
1577	if (RT_FAILURE(rc))
1578	dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1579	break;
1580	}
1581	case 't':
1582	{
1583	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM))
1584	rc = DBGFR3Halt(pThis->Dbgc.pUVM);
1585	/* The reply will be send in the event loop. */
1586	break;
1587	}
1588	default:
1589	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1590	}
1591
1592	return rc;
1593	}
1594
1595
1596	/**
1597	* List of supported 'v<identifier>' packets.
1598	*/
1599	static const GDBSTUBVPKTPROC g_aVPktProcs[] =
1600	{
1601	#define GDBSTUBVPKTPROC_INIT(a_Name, a_pszReply, a_pfnProc) { a_Name, sizeof(a_Name) - 1, a_pszReply, sizeof(a_pszReply) - 1, a_pfnProc }
1602	GDBSTUBVPKTPROC_INIT("Cont", "vCont;s;c;t", dbgcGdbStubCtxPktProcessVCont)
1603	#undef GDBSTUBVPKTPROC_INIT
1604	};
1605
1606
1607	/**
1608	* Processes a 'v<identifier>' packet, sending the appropriate reply.
1609	*
1610	* @returns Status code.
1611	* @param pThis The GDB stub context.
1612	* @param pbPktRem The remaining packet data (without the 'v').
1613	* @param cbPktRem Size of the remaining packet in bytes.
1614	*/
1615	static int dbgcGdbStubCtxPktProcessV(PGDBSTUBCTX pThis, const uint8_t *pbPktRem, size_t cbPktRem)
1616	{
1617	/* Determine the end of the identifier, delimiters are '?', ';' or end of packet. */
1618	bool fQuery = false;
1619	const uint8_t pbDelim = (const uint8_t )memchr(pbPktRem, '?', cbPktRem);
1620	if (!pbDelim)
1621	pbDelim = (const uint8_t *)memchr(pbPktRem, ';', cbPktRem);
1622	else
1623	fQuery = true;
1624
1625	size_t cchId = 0;
1626	if (pbDelim) /* Delimiter found, calculate length. */
1627	cchId = pbDelim - pbPktRem;
1628	else /* Not found, size goes till end of packet. */
1629	cchId = cbPktRem;
1630
1631	/* Search the query and execute the processor or return an empty reply if not supported. */
1632	for (uint32_t i = 0; i < RT_ELEMENTS(g_aVPktProcs); i++)
1633	{
1634	PCGDBSTUBVPKTPROC pVProc = &g_aVPktProcs[i];
1635
1636	if ( pVProc->cchName == cchId
1637	&& !memcmp(pbPktRem, pVProc->pszName, cchId))
1638	{
1639	/* Just send the static reply for a query and execute the processor for everything else. */
1640	if (fQuery)
1641	return dbgcGdbStubCtxReplySend(pThis, pVProc->pszReplyQ, pVProc->cchReplyQ);
1642
1643	/* Execute the handler. */
1644	return pVProc->pfnProc(pThis, pbPktRem + cchId, cbPktRem - cchId);
1645	}
1646	}
1647
1648	return dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1649	}
1650
1651
1652	/**
1653	* Processes a 'H<op><thread-id>' packet, sending the appropriate reply.
1654	*
1655	* @returns Status code.
1656	* @param pThis The GDB stub context.
1657	* @param pbPktRem The remaining packet data (without the 'H').
1658	* @param cbPktRem Size of the remaining packet in bytes.
1659	*/
1660	static int dbgcGdbStubCtxPktProcessH(PGDBSTUBCTX pThis, const uint8_t *pbPktRem, size_t cbPktRem)
1661	{
1662	int rc = VINF_SUCCESS;
1663
1664	if (*pbPktRem == 'g')
1665	{
1666	cbPktRem--;
1667	pbPktRem++;
1668
1669	/* We know there is an # character denoting the end so the following must return with VWRN_TRAILING_CHARS. */
1670	VMCPUID idCpu;
1671	rc = RTStrToUInt32Ex((const char )pbPktRem, NULL /ppszNext*/, 16, &idCpu);
1672	if ( rc == VWRN_TRAILING_CHARS
1673	&& idCpu > 0)
1674	{
1675	idCpu--;
1676
1677	VMCPUID cCpus = DBGFR3CpuGetCount(pThis->Dbgc.pUVM);
1678	if (idCpu < cCpus)
1679	{
1680	pThis->Dbgc.idCpu = idCpu;
1681	rc = dbgcGdbStubCtxReplySendOk(pThis);
1682	}
1683	else
1684	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1685	}
1686	else
1687	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1688	}
1689	else /* Do not support the 'c' operation for now (will be handled through vCont later on anyway). */
1690	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
1691
1692	return rc;
1693	}
1694
1695
1696	/**
1697	* Processes a completely received packet.
1698	*
1699	* @returns Status code.
1700	* @param pThis The GDB stub context.
1701	*/
1702	static int dbgcGdbStubCtxPktProcess(PGDBSTUBCTX pThis)
1703	{
1704	int rc = VINF_SUCCESS;
1705
1706	if (pThis->cbPkt >= 1)
1707	{
1708	switch (pThis->pbPktBuf[1])
1709	{
1710	case '!': /* Enabled extended mode. */
1711	{
1712	pThis->fExtendedMode = true;
1713	rc = dbgcGdbStubCtxReplySendOk(pThis);
1714	break;
1715	}
1716	case '?':
1717	{
1718	/* Return signal state. */
1719	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
1720	break;
1721	}
1722	case 's': /* Single step, response will be sent in the event loop. */
1723	{
1724	PDBGFADDRESS pStackPop = NULL;
1725	RTGCPTR cbStackPop = 0;
1726	rc = DBGFR3StepEx(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, DBGF_STEP_F_INTO, NULL,
1727	pStackPop, cbStackPop, 1 /cMaxSteps/);
1728	if (RT_FAILURE(rc))
1729	dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1730	break;
1731	}
1732	case 'c': /* Continue, no response */
1733	{
1734	if (DBGFR3IsHalted(pThis->Dbgc.pUVM))
1735	DBGFR3Resume(pThis->Dbgc.pUVM);
1736	break;
1737	}
1738	case 'H':
1739	{
1740	rc = dbgcGdbStubCtxPktProcessH(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
1741	break;
1742	}
1743	case 'T':
1744	{
1745	rc = dbgcGdbStubCtxReplySendOk(pThis);
1746	break;
1747	}
1748	case 'g': /* Read general registers. */
1749	{
1750	uint32_t idxRegMax = 0;
1751	size_t cbRegs = 0;
1752	for (;;)
1753	{
1754	const GDBREGDESC *pReg = &pThis->paRegs[idxRegMax++];
1755	cbRegs += pReg->cBits / 8;
1756	if (pReg->enmReg == DBGFREG_SS) /* Up to this seems to belong to the general register set. */
1757	break;
1758	}
1759
1760	size_t cbReplyPkt = cbRegs * 2 + 1; /* One byte needs two characters. */
1761	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1762	if (RT_SUCCESS(rc))
1763	{
1764	size_t cbLeft = cbReplyPkt;
1765	uint8_t *pbReply = pThis->pbPktBuf;
1766
1767	for (uint32_t i = 0; i < idxRegMax && RT_SUCCESS(rc); i++)
1768	{
1769	const GDBREGDESC *pReg = &pThis->paRegs[i];
1770	size_t cbReg = pReg->cBits / 8;
1771	union
1772	{
1773	uint32_t u32;
1774	uint64_t u64;
1775	uint8_t au8[8];
1776	} RegVal;
1777
1778	if (pReg->cBits == 32)
1779	rc = DBGFR3RegCpuQueryU32(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->enmReg, &RegVal.u32);
1780	else
1781	rc = DBGFR3RegCpuQueryU64(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->enmReg, &RegVal.u64);
1782
1783	if (RT_SUCCESS(rc))
1784	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pbReply, cbLeft, &RegVal.au8[0], cbReg);
1785
1786	pbReply += cbReg * 2;
1787	cbLeft -= cbReg * 2;
1788	}
1789
1790	if (RT_SUCCESS(rc))
1791	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1792	else
1793	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1794	}
1795
1796	break;
1797	}
1798	case 'm': /* Read memory. */
1799	{
1800	uint64_t GdbTgtAddr = 0;
1801	const uint8_t *pbPktSep = NULL;
1802
1803	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &GdbTgtAddr,
1804	',', &pbPktSep);
1805	if (RT_SUCCESS(rc))
1806	{
1807	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1808	uint64_t cbRead = 0;
1809	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &cbRead, GDBSTUB_PKT_END, NULL);
1810	if (RT_SUCCESS(rc))
1811	{
1812	size_t cbReplyPkt = cbRead * 2 + 1; /* One byte needs two characters. */
1813
1814	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1815	if (RT_SUCCESS(rc))
1816	{
1817	uint8_t *pbPktBuf = pThis->pbPktBuf;
1818	size_t cbPktBufLeft = cbReplyPkt;
1819	DBGFADDRESS AddrRead;
1820
1821	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &AddrRead, GdbTgtAddr);
1822
1823	while ( cbRead
1824	&& RT_SUCCESS(rc))
1825	{
1826	uint8_t abTmp[_4K];
1827	size_t cbThisRead = RT_MIN(cbRead, sizeof(abTmp));
1828
1829	rc = DBGFR3MemRead(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &AddrRead, &abTmp[0], cbThisRead);
1830	if (RT_FAILURE(rc))
1831	break;
1832
1833	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pbPktBuf, cbPktBufLeft, &abTmp[0], cbThisRead);
1834	if (RT_FAILURE(rc))
1835	break;
1836
1837	DBGFR3AddrAdd(&AddrRead, cbThisRead);
1838	cbRead -= cbThisRead;
1839	pbPktBuf += cbThisRead;
1840	cbPktBufLeft -= cbThisRead;
1841	}
1842
1843	if (RT_SUCCESS(rc))
1844	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1845	else
1846	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1847	}
1848	else
1849	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1850	}
1851	else
1852	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1853	}
1854	else
1855	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1856	break;
1857	}
1858	case 'M': /* Write memory. */
1859	{
1860	uint64_t GdbTgtAddr = 0;
1861	const uint8_t *pbPktSep = NULL;
1862
1863	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &GdbTgtAddr,
1864	',', &pbPktSep);
1865	if (RT_SUCCESS(rc))
1866	{
1867	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1868	uint64_t cbWrite = 0;
1869	rc = dbgcGdbStubCtxParseHexStringAsInteger(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &cbWrite, ':', &pbPktSep);
1870	if (RT_SUCCESS(rc))
1871	{
1872	cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1873	const uint8_t *pbDataCur = pbPktSep + 1;
1874	size_t cbDataLeft = pThis->cbPkt - 1 - cbProcessed - 1 - 1;
1875	DBGFADDRESS AddrWrite;
1876
1877	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &AddrWrite, GdbTgtAddr);
1878
1879	while ( cbWrite
1880	&& RT_SUCCESS(rc))
1881	{
1882	uint8_t abTmp[_4K];
1883	size_t cbThisWrite = RT_MIN(cbWrite, sizeof(abTmp));
1884	size_t cbDecoded = 0;
1885
1886	rc = dbgcGdbStubCtxParseHexStringAsByteBuf(pbDataCur, cbDataLeft, &abTmp[0], cbThisWrite, &cbDecoded);
1887	if (!rc)
1888	rc = DBGFR3MemWrite(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &AddrWrite, &abTmp[0], cbThisWrite);
1889
1890	DBGFR3AddrAdd(&AddrWrite, cbThisWrite);
1891	cbWrite -= cbThisWrite;
1892	pbDataCur += cbDecoded;
1893	cbDataLeft -= cbDecoded;
1894	}
1895
1896	if (RT_SUCCESS(rc))
1897	rc = dbgcGdbStubCtxReplySendOk(pThis);
1898	else
1899	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1900	}
1901	else
1902	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1903	}
1904	else
1905	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1906	break;
1907	}
1908	case 'p': /* Read a single register */
1909	{
1910	uint64_t uReg = 0;
1911	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &uReg,
1912	GDBSTUB_PKT_END, NULL);
1913	if (RT_SUCCESS(rc))
1914	{
1915	DBGFREGVAL RegVal;
1916	DBGFREGVALTYPE enmType;
1917	const GDBREGDESC *pReg = dbgcGdbStubRegGet(pThis, uReg);
1918	if (RT_LIKELY(pReg))
1919	{
1920	rc = DBGFR3RegNmQuery(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->pszName, &RegVal, &enmType);
1921	if (RT_SUCCESS(rc))
1922	{
1923	size_t cbReg = pReg->cBits / 8;
1924	size_t cbReplyPkt = cbReg * 2 + 1; /* One byte needs two characters. */
1925
1926	/* Encode data and send. */
1927	rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, cbReplyPkt);
1928	if (RT_SUCCESS(rc))
1929	{
1930	rc = dbgcGdbStubCtxEncodeBinaryAsHex(pThis->pbPktBuf, pThis->cbPktBufMax, &RegVal.au8[0], cbReg);
1931	if (RT_SUCCESS(rc))
1932	rc = dbgcGdbStubCtxReplySend(pThis, pThis->pbPktBuf, cbReplyPkt);
1933	else
1934	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1935	}
1936	else
1937	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1938	}
1939	else
1940	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1941	}
1942	else
1943	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1944	}
1945	else
1946	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1947	break;
1948	}
1949	case 'P': /* Write a single register */
1950	{
1951	uint64_t uReg = 0;
1952	const uint8_t *pbPktSep = NULL;
1953	rc = dbgcGdbStubCtxParseHexStringAsInteger(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &uReg,
1954	'=', &pbPktSep);
1955	if (RT_SUCCESS(rc))
1956	{
1957	const GDBREGDESC *pReg = dbgcGdbStubRegGet(pThis, uReg);
1958
1959	if (pReg)
1960	{
1961	DBGFREGVAL RegVal;
1962	DBGFREGVALTYPE enmValType = pReg->cBits == 64 ? DBGFREGVALTYPE_U64 : DBGFREGVALTYPE_U32;
1963	size_t cbProcessed = pbPktSep - &pThis->pbPktBuf[2];
1964	rc = dbgcGdbStubCtxParseHexStringAsByteBuf(pbPktSep + 1, pThis->cbPkt - 1 - cbProcessed - 1, &RegVal.au8[0], pReg->cBits / 8, NULL);
1965	if (RT_SUCCESS(rc))
1966	{
1967	rc = DBGFR3RegNmSet(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, pReg->pszName, &RegVal, enmValType);
1968	if (RT_SUCCESS(rc))
1969	rc = dbgcGdbStubCtxReplySendOk(pThis);
1970	else
1971	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1972	}
1973	}
1974	else
1975	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NET_PROTOCOL_ERROR);
1976	}
1977	else
1978	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
1979	break;
1980	}
1981	case 'Z': /* Insert a breakpoint/watchpoint. */
1982	{
1983	GDBSTUBTPTYPE enmTpType = GDBSTUBTPTYPE_INVALID;
1984	uint64_t GdbTgtTpAddr = 0;
1985	uint64_t uKind = 0;
1986
1987	rc = dbgcGdbStubCtxParseTpPktArgs(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &enmTpType, &GdbTgtTpAddr, &uKind);
1988	if (RT_SUCCESS(rc))
1989	{
1990	uint32_t iBp = 0;
1991	DBGFADDRESS BpAddr;
1992	DBGFR3AddrFromFlat(pThis->Dbgc.pUVM, &BpAddr, GdbTgtTpAddr);
1993
1994	switch (enmTpType)
1995	{
1996	case GDBSTUBTPTYPE_EXEC_SW:
1997	{
1998	rc = DBGFR3BpSetInt3(pThis->Dbgc.pUVM, pThis->Dbgc.idCpu, &BpAddr,
1999	1 /iHitTrigger/, UINT64_MAX /iHitDisable/, &iBp);
2000	break;
2001	}
2002	case GDBSTUBTPTYPE_EXEC_HW:
2003	{
2004	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2005	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2006	X86_DR7_RW_EO, 1 /cb/, &iBp);
2007	break;
2008	}
2009	case GDBSTUBTPTYPE_MEM_ACCESS:
2010	case GDBSTUBTPTYPE_MEM_READ:
2011	{
2012	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2013	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2014	X86_DR7_RW_RW, uKind /cb/, &iBp);
2015	break;
2016	}
2017	case GDBSTUBTPTYPE_MEM_WRITE:
2018	{
2019	rc = DBGFR3BpSetReg(pThis->Dbgc.pUVM, &BpAddr,
2020	1 /iHitTrigger/, UINT64_MAX /iHitDisable/,
2021	X86_DR7_RW_WO, uKind /cb/, &iBp);
2022	break;
2023	}
2024	default:
2025	AssertMsgFailed(("Invalid trace point type %d\n", enmTpType));
2026	}
2027
2028	if (RT_SUCCESS(rc))
2029	{
2030	rc = dbgcBpAdd(&pThis->Dbgc, iBp, NULL /pszCmd/);
2031	if (RT_SUCCESS(rc))
2032	{
2033	rc = dbgcGdbStubTpRegister(pThis, enmTpType, GdbTgtTpAddr, uKind, iBp);
2034	if (RT_SUCCESS(rc))
2035	rc = dbgcGdbStubCtxReplySendOk(pThis);
2036	else
2037	dbgcBpDelete(&pThis->Dbgc, iBp);
2038	}
2039
2040	if (RT_FAILURE(rc))
2041	{
2042	DBGFR3BpClear(pThis->Dbgc.pUVM, iBp);
2043	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2044	}
2045	}
2046	else
2047	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2048	}
2049	else
2050	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2051	break;
2052	}
2053	case 'z': /* Remove a breakpoint/watchpoint. */
2054	{
2055	GDBSTUBTPTYPE enmTpType = GDBSTUBTPTYPE_INVALID;
2056	uint64_t GdbTgtTpAddr = 0;
2057	uint64_t uKind = 0;
2058
2059	rc = dbgcGdbStubCtxParseTpPktArgs(&pThis->pbPktBuf[2], pThis->cbPkt - 1, &enmTpType, &GdbTgtTpAddr, &uKind);
2060	if (RT_SUCCESS(rc))
2061	{
2062	PGDBSTUBTP pTp = dbgcGdbStubTpFind(pThis, enmTpType, GdbTgtTpAddr, uKind);
2063	if (pTp)
2064	{
2065	int rc2 = DBGFR3BpClear(pThis->Dbgc.pUVM, pTp->iBp);
2066	if (RT_SUCCESS(rc2) \|\| rc2 == VERR_DBGF_BP_NOT_FOUND)
2067	dbgcBpDelete(&pThis->Dbgc, pTp->iBp);
2068
2069	if (RT_SUCCESS(rc2))
2070	{
2071	dbgcGdbStubTpDeregister(pTp);
2072	rc = dbgcGdbStubCtxReplySendOk(pThis);
2073	}
2074	else
2075	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2076	}
2077	else
2078	rc = dbgcGdbStubCtxReplySendErrSts(pThis, VERR_NOT_FOUND);
2079	}
2080	else
2081	rc = dbgcGdbStubCtxReplySendErrSts(pThis, rc);
2082	break;
2083	}
2084	case 'q': /* Query packet */
2085	{
2086	rc = dbgcGdbStubCtxPktProcessQuery(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
2087	break;
2088	}
2089	case 'v': /* Multiletter identifier (verbose?) */
2090	{
2091	rc = dbgcGdbStubCtxPktProcessV(pThis, &pThis->pbPktBuf[2], pThis->cbPkt - 1);
2092	break;
2093	}
2094	case 'R': /* Restart target. */
2095	{
2096	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
2097	break;
2098	}
2099	case 'k': /* Kill target. */
2100	{
2101	/* This is what the 'harakiri' command is doing. */
2102	for (;;)
2103	exit(126);
2104	break;
2105	}
2106	case 'D': /* Detach */
2107	{
2108	rc = dbgcGdbStubCtxReplySendOk(pThis);
2109	if (RT_SUCCESS(rc))
2110	rc = VERR_DBGC_QUIT;
2111	break;
2112	}
2113	default:
2114	/* Not supported, send empty reply. */
2115	rc = dbgcGdbStubCtxReplySend(pThis, NULL, 0);
2116	}
2117	}
2118
2119	return rc;
2120	}
2121
2122
2123	/**
2124	* Resets the packet buffer.
2125	*
2126	* @returns nothing.
2127	* @param pThis The GDB stub context.
2128	*/
2129	static void dbgcGdbStubCtxPktBufReset(PGDBSTUBCTX pThis)
2130	{
2131	pThis->offPktBuf = 0;
2132	pThis->cbPkt = 0;
2133	pThis->cbChksumRecvLeft = 2;
2134	}
2135
2136
2137	/**
2138	* Resets the given GDB stub context to the initial state.
2139	*
2140	* @returns nothing.
2141	* @param pThis The GDB stub context.
2142	*/
2143	static void dbgcGdbStubCtxReset(PGDBSTUBCTX pThis)
2144	{
2145	pThis->enmState = GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START;
2146	dbgcGdbStubCtxPktBufReset(pThis);
2147	}
2148
2149
2150	/**
2151	* Searches for the start character in the current data buffer.
2152	*
2153	* @returns Status code.
2154	* @param pThis The GDB stub context.
2155	* @param cbData Number of new bytes in the packet buffer.
2156	* @param pcbProcessed Where to store the amount of bytes processed.
2157	*/
2158	static int dbgcGdbStubCtxPktBufSearchStart(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2159	{
2160	int rc = VINF_SUCCESS;
2161	const uint8_t pbStart = (const uint8_t )memchr(pThis->pbPktBuf, GDBSTUB_PKT_START, cbData);
2162	if (pbStart)
2163	{
2164	/* Found the start character, align the start to the beginning of the packet buffer and advance the state machine. */
2165	memmove(pThis->pbPktBuf, pbStart, cbData - (pbStart - pThis->pbPktBuf));
2166	pThis->enmState = GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY;
2167	*pcbProcessed = (uintptr_t)(pbStart - pThis->pbPktBuf);
2168	pThis->offPktBuf = 0;
2169	}
2170	else
2171	{
2172	/* Check for out of band characters. */
2173	if (memchr(pThis->pbPktBuf, GDBSTUB_OOB_INTERRUPT, cbData) != NULL)
2174	{
2175	/* Stop target and send packet to indicate the target has stopped. */
2176	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM))
2177	rc = DBGFR3Halt(pThis->Dbgc.pUVM);
2178	/* The reply will be send in the event loop. */
2179	}
2180
2181	/* Not found, ignore the received data and reset the packet buffer. */
2182	dbgcGdbStubCtxPktBufReset(pThis);
2183	*pcbProcessed = cbData;
2184	}
2185
2186	return rc;
2187	}
2188
2189
2190	/**
2191	* Searches for the end character in the current data buffer.
2192	*
2193	* @returns Status code.
2194	* @param pThis The GDB stub context.
2195	* @param cbData Number of new bytes in the packet buffer.
2196	* @param pcbProcessed Where to store the amount of bytes processed.
2197	*/
2198	static int dbgcGdbStubCtxPktBufSearchEnd(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2199	{
2200	const uint8_t pbEnd = (const uint8_t )memchr(&pThis->pbPktBuf[pThis->offPktBuf], GDBSTUB_PKT_END, cbData);
2201	if (pbEnd)
2202	{
2203	/* Found the end character, next comes the checksum. */
2204	pThis->enmState = GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM;
2205
2206	*pcbProcessed = (uintptr_t)(pbEnd - &pThis->pbPktBuf[pThis->offPktBuf]) + 1;
2207	pThis->offPktBuf += *pcbProcessed;
2208	pThis->cbPkt = pThis->offPktBuf - 1; /* Don't account for the start and end character. */
2209	}
2210	else
2211	{
2212	/* Not found, still in the middle of a packet. */
2213	/** @todo Look for out of band characters. */
2214	*pcbProcessed = cbData;
2215	pThis->offPktBuf += cbData;
2216	}
2217
2218	return VINF_SUCCESS;
2219	}
2220
2221
2222	/**
2223	* Processes the checksum.
2224	*
2225	* @returns Status code.
2226	* @param pThis The GDB stub context.
2227	* @param cbData Number of new bytes in the packet buffer.
2228	* @param pcbProcessed Where to store the amount of bytes processed.
2229	*/
2230	static int dbgcGdbStubCtxPktBufProcessChksum(PGDBSTUBCTX pThis, size_t cbData, size_t *pcbProcessed)
2231	{
2232	int rc = VINF_SUCCESS;
2233	size_t cbChksumProcessed = (cbData < pThis->cbChksumRecvLeft) ? cbData : pThis->cbChksumRecvLeft;
2234
2235	pThis->cbChksumRecvLeft -= cbChksumProcessed;
2236	if (!pThis->cbChksumRecvLeft)
2237	{
2238	/* Verify checksum of the whole packet. */
2239	uint8_t uChkSum = dbgcGdbStubCtxChrToHex(pThis->pbPktBuf[pThis->offPktBuf]) << 4
2240	\| dbgcGdbStubCtxChrToHex(pThis->pbPktBuf[pThis->offPktBuf + 1]);
2241
2242	uint8_t uSum = 0;
2243	for (size_t i = 1; i < pThis->cbPkt; i++)
2244	uSum += pThis->pbPktBuf[i];
2245
2246	if (uSum == uChkSum)
2247	{
2248	/* Checksum matches, send acknowledge and continue processing the complete payload. */
2249	char chAck = '+';
2250	rc = dbgcGdbStubCtxWrite(pThis, &chAck, sizeof(chAck));
2251	if (RT_SUCCESS(rc))
2252	rc = dbgcGdbStubCtxPktProcess(pThis);
2253	}
2254	else
2255	{
2256	/* Send NACK and reset for the next packet. */
2257	char chAck = '-';
2258	rc = dbgcGdbStubCtxWrite(pThis, &chAck, sizeof(chAck));
2259	}
2260
2261	dbgcGdbStubCtxReset(pThis);
2262	}
2263
2264	*pcbProcessed += cbChksumProcessed;
2265	return rc;
2266	}
2267
2268
2269	/**
2270	* Process read data in the packet buffer based on the current state.
2271	*
2272	* @returns Status code.
2273	* @param pThis The GDB stub context.
2274	* @param cbData Number of new bytes in the packet buffer.
2275	*/
2276	static int dbgcGdbStubCtxPktBufProcess(PGDBSTUBCTX pThis, size_t cbData)
2277	{
2278	int rc = VINF_SUCCESS;
2279
2280	while ( cbData
2281	&& RT_SUCCESS(rc))
2282	{
2283	size_t cbProcessed = 0;
2284
2285	switch (pThis->enmState)
2286	{
2287	case GDBSTUBRECVSTATE_PACKET_WAIT_FOR_START:
2288	{
2289	rc = dbgcGdbStubCtxPktBufSearchStart(pThis, cbData, &cbProcessed);
2290	break;
2291	}
2292	case GDBSTUBRECVSTATE_PACKET_RECEIVE_BODY:
2293	{
2294	rc = dbgcGdbStubCtxPktBufSearchEnd(pThis, cbData, &cbProcessed);
2295	break;
2296	}
2297	case GDBSTUBRECVSTATE_PACKET_RECEIVE_CHECKSUM:
2298	{
2299	rc = dbgcGdbStubCtxPktBufProcessChksum(pThis, cbData, &cbProcessed);
2300	break;
2301	}
2302	default:
2303	/* Should never happen. */
2304	rc = VERR_INTERNAL_ERROR;
2305	}
2306
2307	cbData -= cbProcessed;
2308	}
2309
2310	return rc;
2311	}
2312
2313
2314	/**
2315	* Receive data and processes complete packets.
2316	*
2317	* @returns Status code.
2318	* @param pThis The GDB stub context.
2319	*/
2320	static int dbgcGdbStubCtxRecv(PGDBSTUBCTX pThis)
2321	{
2322	/*
2323	* Read in 32 bytes chunks for now (need some peek API to get the amount of bytes actually available
2324	* to make it a bit more optimized).
2325	*/
2326	int rc = dbgcGdbStubCtxEnsurePktBufSpace(pThis, 32);
2327	if (RT_SUCCESS(rc))
2328	{
2329	size_t cbThisRead = 32;
2330	rc = pThis->Dbgc.pBack->pfnRead(pThis->Dbgc.pBack, &pThis->pbPktBuf[pThis->offPktBuf], cbThisRead, &cbThisRead);
2331	if (RT_SUCCESS(rc))
2332	rc = dbgcGdbStubCtxPktBufProcess(pThis, cbThisRead);
2333	}
2334
2335	return rc;
2336	}
2337
2338
2339	/**
2340	* Processes debugger events.
2341	*
2342	* @returns VBox status code.
2343	* @param pThis The GDB stub context data.
2344	* @param pEvent Pointer to event data.
2345	*/
2346	static int dbgcGdbStubCtxProcessEvent(PGDBSTUBCTX pThis, PCDBGFEVENT pEvent)
2347	{
2348	/*
2349	* Process the event.
2350	*/
2351	PDBGC pDbgc = &pThis->Dbgc;
2352	pThis->Dbgc.pszScratch = &pThis->Dbgc.achInput[0];
2353	pThis->Dbgc.iArg = 0;
2354	int rc = VINF_SUCCESS;
2355	switch (pEvent->enmType)
2356	{
2357	/*
2358	* The first part is events we have initiated with commands.
2359	*/
2360	case DBGFEVENT_HALT_DONE:
2361	{
2362	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2363	break;
2364	}
2365
2366
2367	/*
2368	* The second part is events which can occur at any time.
2369	*/
2370	case DBGFEVENT_FATAL_ERROR:
2371	{
2372	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbf event: Fatal error! (%s)\n",
2373	dbgcGetEventCtx(pEvent->enmCtx));
2374	if (RT_SUCCESS(rc))
2375	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2376	break;
2377	}
2378
2379	case DBGFEVENT_BREAKPOINT:
2380	case DBGFEVENT_BREAKPOINT_IO:
2381	case DBGFEVENT_BREAKPOINT_MMIO:
2382	case DBGFEVENT_BREAKPOINT_HYPER:
2383	{
2384	rc = dbgcBpExec(pDbgc, pEvent->u.Bp.iBp);
2385	switch (rc)
2386	{
2387	case VERR_DBGC_BP_NOT_FOUND:
2388	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Unknown breakpoint %u! (%s)\n",
2389	pEvent->u.Bp.iBp, dbgcGetEventCtx(pEvent->enmCtx));
2390	break;
2391
2392	case VINF_DBGC_BP_NO_COMMAND:
2393	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Breakpoint %u! (%s)\n",
2394	pEvent->u.Bp.iBp, dbgcGetEventCtx(pEvent->enmCtx));
2395	break;
2396
2397	case VINF_BUFFER_OVERFLOW:
2398	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: Breakpoint %u! Command too long to execute! (%s)\n",
2399	pEvent->u.Bp.iBp, dbgcGetEventCtx(pEvent->enmCtx));
2400	break;
2401
2402	default:
2403	break;
2404	}
2405	if (RT_SUCCESS(rc) && DBGFR3IsHalted(pDbgc->pUVM))
2406	{
2407	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2408
2409	/* Set the resume flag to ignore the breakpoint when resuming execution. */
2410	if ( RT_SUCCESS(rc)
2411	&& pEvent->enmType == DBGFEVENT_BREAKPOINT)
2412	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r eflags.rf = 1");
2413	}
2414
2415	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2416	break;
2417	}
2418
2419	case DBGFEVENT_STEPPED:
2420	case DBGFEVENT_STEPPED_HYPER:
2421	{
2422	rc = dbgcGdbStubCtxReplySendSigTrap(pThis);
2423	break;
2424	}
2425
2426	case DBGFEVENT_ASSERTION_HYPER:
2427	{
2428	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2429	"\ndbgf event: Hypervisor Assertion! (%s)\n"
2430	"%s"
2431	"%s"
2432	"\n",
2433	dbgcGetEventCtx(pEvent->enmCtx),
2434	pEvent->u.Assert.pszMsg1,
2435	pEvent->u.Assert.pszMsg2);
2436	if (RT_SUCCESS(rc))
2437	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2438	break;
2439	}
2440
2441	case DBGFEVENT_DEV_STOP:
2442	{
2443	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2444	"\n"
2445	"dbgf event: DBGFSTOP (%s)\n"
2446	"File: %s\n"
2447	"Line: %d\n"
2448	"Function: %s\n",
2449	dbgcGetEventCtx(pEvent->enmCtx),
2450	pEvent->u.Src.pszFile,
2451	pEvent->u.Src.uLine,
2452	pEvent->u.Src.pszFunction);
2453	if (RT_SUCCESS(rc) && pEvent->u.Src.pszMessage && *pEvent->u.Src.pszMessage)
2454	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL,
2455	"Message: %s\n",
2456	pEvent->u.Src.pszMessage);
2457	if (RT_SUCCESS(rc))
2458	rc = pDbgc->CmdHlp.pfnExec(&pDbgc->CmdHlp, "r");
2459	break;
2460	}
2461
2462
2463	case DBGFEVENT_INVALID_COMMAND:
2464	{
2465	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf/dbgc error: Invalid command event!\n");
2466	break;
2467	}
2468
2469	case DBGFEVENT_POWERING_OFF:
2470	{
2471	pThis->Dbgc.fReady = false;
2472	pThis->Dbgc.pBack->pfnSetReady(pThis->Dbgc.pBack, false);
2473	rc = VERR_GENERAL_FAILURE;
2474	break;
2475	}
2476
2477	default:
2478	{
2479	/*
2480	* Probably a generic event. Look it up to find its name.
2481	*/
2482	PCDBGCSXEVT pEvtDesc = dbgcEventLookup(pEvent->enmType);
2483	if (pEvtDesc)
2484	{
2485	if (pEvtDesc->enmKind == kDbgcSxEventKind_Interrupt)
2486	{
2487	Assert(pEvtDesc->pszDesc);
2488	Assert(pEvent->u.Generic.cArgs == 1);
2489	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s no %#llx! (%s)\n",
2490	pEvtDesc->pszDesc, pEvent->u.Generic.auArgs[0], pEvtDesc->pszName);
2491	}
2492	else if (pEvtDesc->fFlags & DBGCSXEVT_F_BUGCHECK)
2493	{
2494	Assert(pEvent->u.Generic.cArgs >= 5);
2495	char szDetails[512];
2496	DBGFR3FormatBugCheck(pDbgc->pUVM, szDetails, sizeof(szDetails), pEvent->u.Generic.auArgs[0],
2497	pEvent->u.Generic.auArgs[1], pEvent->u.Generic.auArgs[2],
2498	pEvent->u.Generic.auArgs[3], pEvent->u.Generic.auArgs[4]);
2499	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s %s%s!\n%s", pEvtDesc->pszName,
2500	pEvtDesc->pszDesc ? "- " : "", pEvtDesc->pszDesc ? pEvtDesc->pszDesc : "",
2501	szDetails);
2502	}
2503	else if ( (pEvtDesc->fFlags & DBGCSXEVT_F_TAKE_ARG)
2504	\|\| pEvent->u.Generic.cArgs > 1
2505	\|\| ( pEvent->u.Generic.cArgs == 1
2506	&& pEvent->u.Generic.auArgs[0] != 0))
2507	{
2508	if (pEvtDesc->pszDesc)
2509	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s - %s!",
2510	pEvtDesc->pszName, pEvtDesc->pszDesc);
2511	else
2512	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s!", pEvtDesc->pszName);
2513	if (pEvent->u.Generic.cArgs <= 1)
2514	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, " arg=%#llx\n", pEvent->u.Generic.auArgs[0]);
2515	else
2516	{
2517	for (uint32_t i = 0; i < pEvent->u.Generic.cArgs; i++)
2518	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, " args[%u]=%#llx", i, pEvent->u.Generic.auArgs[i]);
2519	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\n");
2520	}
2521	}
2522	else
2523	{
2524	if (pEvtDesc->pszDesc)
2525	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s - %s!\n",
2526	pEvtDesc->pszName, pEvtDesc->pszDesc);
2527	else
2528	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf event: %s!\n", pEvtDesc->pszName);
2529	}
2530	}
2531	else
2532	rc = pDbgc->CmdHlp.pfnPrintf(&pDbgc->CmdHlp, NULL, "\ndbgf/dbgc error: Unknown event %d!\n", pEvent->enmType);
2533	break;
2534	}
2535	}
2536
2537	return rc;
2538	}
2539
2540
2541	/**
2542	* Run the debugger console.
2543	*
2544	* @returns VBox status code.
2545	* @param pThis Pointer to the GDB stub context.
2546	*/
2547	int dbgcGdbStubRun(PGDBSTUBCTX pThis)
2548	{
2549	/* Select the register set based on the CPU mode. */
2550	CPUMMODE enmMode = DBGCCmdHlpGetCpuMode(&pThis->Dbgc.CmdHlp);
2551	switch (enmMode)
2552	{
2553	case CPUMMODE_PROTECTED:
2554	pThis->paRegs = &g_aGdbRegs32[0];
2555	pThis->cRegs = RT_ELEMENTS(g_aGdbRegs32);
2556	break;
2557	case CPUMMODE_LONG:
2558	pThis->paRegs = &g_aGdbRegs64[0];
2559	pThis->cRegs = RT_ELEMENTS(g_aGdbRegs64);
2560	break;
2561	case CPUMMODE_REAL:
2562	default:
2563	return DBGCCmdHlpPrintf(&pThis->Dbgc.CmdHlp, "error: Invalid CPU mode %d.\n", enmMode);
2564	}
2565
2566	/*
2567	* We're ready for commands now.
2568	*/
2569	pThis->Dbgc.fReady = true;
2570	pThis->Dbgc.pBack->pfnSetReady(pThis->Dbgc.pBack, true);
2571
2572	/*
2573	* Main Debugger Loop.
2574	*
2575	* This loop will either block on waiting for input or on waiting on
2576	* debug events. If we're forwarding the log we cannot wait for long
2577	* before we must flush the log.
2578	*/
2579	int rc;
2580	for (;;)
2581	{
2582	rc = VERR_SEM_OUT_OF_TURN;
2583	if (pThis->Dbgc.pUVM)
2584	rc = DBGFR3QueryWaitable(pThis->Dbgc.pUVM);
2585
2586	if (RT_SUCCESS(rc))
2587	{
2588	/*
2589	* Wait for a debug event.
2590	*/
2591	PCDBGFEVENT pEvent;
2592	rc = DBGFR3EventWait(pThis->Dbgc.pUVM, 32, &pEvent);
2593	if (RT_SUCCESS(rc))
2594	{
2595	rc = dbgcGdbStubCtxProcessEvent(pThis, pEvent);
2596	if (RT_FAILURE(rc))
2597	break;
2598	}
2599	else if (rc != VERR_TIMEOUT)
2600	break;
2601
2602	/*
2603	* Check for input.
2604	*/
2605	if (pThis->Dbgc.pBack->pfnInput(pThis->Dbgc.pBack, 0))
2606	{
2607	rc = dbgcGdbStubCtxRecv(pThis);
2608	if (RT_FAILURE(rc))
2609	break;
2610	}
2611	}
2612	else if (rc == VERR_SEM_OUT_OF_TURN)
2613	{
2614	/*
2615	* Wait for input.
2616	*/
2617	if (pThis->Dbgc.pBack->pfnInput(pThis->Dbgc.pBack, 1000))
2618	{
2619	rc = dbgcGdbStubCtxRecv(pThis);
2620	if (RT_FAILURE(rc))
2621	break;
2622	}
2623	}
2624	else
2625	break;
2626	}
2627
2628	return rc;
2629	}
2630
2631
2632	/**
2633	* @copydoc DBGC::pfnOutput
2634	*/
2635	static DECLCALLBACK(int) dbgcOutputGdb(void pvUser, const char pachChars, size_t cbChars)
2636	{
2637	PGDBSTUBCTX pThis = (PGDBSTUBCTX)pvUser;
2638
2639	pThis->fOutput = true;
2640	int rc = dbgcGdbStubCtxReplySendBegin(pThis);
2641	if (RT_SUCCESS(rc))
2642	{
2643	uint8_t chConOut = 'O';
2644	rc = dbgcGdbStubCtxReplySendData(pThis, &chConOut, sizeof(chConOut));
2645	if (RT_SUCCESS(rc))
2646	{
2647	/* Convert the characters to hex. */
2648	const char *pachCur = pachChars;
2649
2650	while ( cbChars
2651	&& RT_SUCCESS(rc))
2652	{
2653	uint8_t achHex[512 + 1];
2654	size_t cbThisSend = RT_MIN((sizeof(achHex) - 1) / 2, cbChars); /* Each character needs two bytes. */
2655
2656	rc = dbgcGdbStubCtxEncodeBinaryAsHex(&achHex[0], cbThisSend * 2 + 1, pachCur, cbThisSend);
2657	if (RT_SUCCESS(rc))
2658	rc = dbgcGdbStubCtxReplySendData(pThis, &achHex[0], cbThisSend * 2);
2659
2660	pachCur += cbThisSend;
2661	cbChars -= cbThisSend;
2662	}
2663	}
2664
2665	dbgcGdbStubCtxReplySendEnd(pThis);
2666	}
2667
2668	return rc;
2669	}
2670
2671
2672	/**
2673	* Creates a GDB stub context instance with the given backend.
2674	*
2675	* @returns VBox status code.
2676	* @param ppGdbStubCtx Where to store the pointer to the GDB stub context instance on success.
2677	* @param pBack The backend to use for I/O.
2678	* @param fFlags Flags controlling the behavior.
2679	*/
2680	static int dbgcGdbStubCtxCreate(PPGDBSTUBCTX ppGdbStubCtx, PDBGCBACK pBack, unsigned fFlags)
2681	{
2682	/*
2683	* Validate input.
2684	*/
2685	AssertPtrReturn(pBack, VERR_INVALID_POINTER);
2686	AssertMsgReturn(!fFlags, ("%#x", fFlags), VERR_INVALID_PARAMETER);
2687
2688	/*
2689	* Allocate and initialize.
2690	*/
2691	PGDBSTUBCTX pThis = (PGDBSTUBCTX)RTMemAllocZ(sizeof(*pThis));
2692	if (!pThis)
2693	return VERR_NO_MEMORY;
2694
2695	dbgcInitCmdHlp(&pThis->Dbgc);
2696	/*
2697	* This is compied from the native debug console (will be used for monitor commands)
2698	* in DBGCConsole.cpp. Try to keep both functions in sync.
2699	*/
2700	pThis->Dbgc.pBack = pBack;
2701	pThis->Dbgc.pfnOutput = dbgcOutputGdb;
2702	pThis->Dbgc.pvOutputUser = pThis;
2703	pThis->Dbgc.pVM = NULL;
2704	pThis->Dbgc.pUVM = NULL;
2705	pThis->Dbgc.idCpu = 0;
2706	pThis->Dbgc.hDbgAs = DBGF_AS_GLOBAL;
2707	pThis->Dbgc.pszEmulation = "CodeView/WinDbg";
2708	pThis->Dbgc.paEmulationCmds = &g_aCmdsCodeView[0];
2709	pThis->Dbgc.cEmulationCmds = g_cCmdsCodeView;
2710	pThis->Dbgc.paEmulationFuncs = &g_aFuncsCodeView[0];
2711	pThis->Dbgc.cEmulationFuncs = g_cFuncsCodeView;
2712	//pThis->Dbgc.fLog = false;
2713	pThis->Dbgc.fRegTerse = true;
2714	pThis->Dbgc.fStepTraceRegs = true;
2715	//pThis->Dbgc.cPagingHierarchyDumps = 0;
2716	//pThis->Dbgc.DisasmPos = {0};
2717	//pThis->Dbgc.SourcePos = {0};
2718	//pThis->Dbgc.DumpPos = {0};
2719	pThis->Dbgc.pLastPos = &pThis->Dbgc.DisasmPos;
2720	//pThis->Dbgc.cbDumpElement = 0;
2721	//pThis->Dbgc.cVars = 0;
2722	//pThis->Dbgc.paVars = NULL;
2723	//pThis->Dbgc.pPlugInHead = NULL;
2724	//pThis->Dbgc.pFirstBp = NULL;
2725	//pThis->Dbgc.abSearch = {0};
2726	//pThis->Dbgc.cbSearch = 0;
2727	pThis->Dbgc.cbSearchUnit = 1;
2728	pThis->Dbgc.cMaxSearchHits = 1;
2729	//pThis->Dbgc.SearchAddr = {0};
2730	//pThis->Dbgc.cbSearchRange = 0;
2731
2732	//pThis->Dbgc.uInputZero = 0;
2733	//pThis->Dbgc.iRead = 0;
2734	//pThis->Dbgc.iWrite = 0;
2735	//pThis->Dbgc.cInputLines = 0;
2736	//pThis->Dbgc.fInputOverflow = false;
2737	pThis->Dbgc.fReady = true;
2738	pThis->Dbgc.pszScratch = &pThis->Dbgc.achScratch[0];
2739	//pThis->Dbgc.iArg = 0;
2740	//pThis->Dbgc.rcOutput = 0;
2741	//pThis->Dbgc.rcCmd = 0;
2742
2743	//pThis->Dbgc.pszHistoryFile = NULL;
2744	//pThis->Dbgc.pszGlobalInitScript = NULL;
2745	//pThis->Dbgc.pszLocalInitScript = NULL;
2746
2747	dbgcEvalInit();
2748
2749	/* Init the GDB stub specific parts. */
2750	pThis->cbPktBufMax = 0;
2751	pThis->pbPktBuf = NULL;
2752	pThis->fFeatures = GDBSTUBCTX_FEATURES_F_TGT_DESC;
2753	pThis->pachTgtXmlDesc = NULL;
2754	pThis->cbTgtXmlDesc = 0;
2755	pThis->fExtendedMode = false;
2756	pThis->fOutput = false;
2757	pThis->fInThrdInfoQuery = false;
2758	RTListInit(&pThis->LstTps);
2759	dbgcGdbStubCtxReset(pThis);
2760
2761	*ppGdbStubCtx = pThis;
2762	return VINF_SUCCESS;
2763	}
2764
2765
2766	/**
2767	* Destroys the given GDB stub context.
2768	*
2769	* @returns nothing.
2770	* @param pThis The GDB stub context to destroy.
2771	*/
2772	static void dbgcGdbStubDestroy(PGDBSTUBCTX pThis)
2773	{
2774	AssertPtr(pThis);
2775
2776	/* Detach from the VM. */
2777	if (pThis->Dbgc.pUVM)
2778	DBGFR3Detach(pThis->Dbgc.pUVM);
2779
2780	/* Free config strings. */
2781	RTStrFree(pThis->Dbgc.pszGlobalInitScript);
2782	pThis->Dbgc.pszGlobalInitScript = NULL;
2783	RTStrFree(pThis->Dbgc.pszLocalInitScript);
2784	pThis->Dbgc.pszLocalInitScript = NULL;
2785	RTStrFree(pThis->Dbgc.pszHistoryFile);
2786	pThis->Dbgc.pszHistoryFile = NULL;
2787
2788	/* Finally, free the instance memory. */
2789	RTMemFree(pThis);
2790	}
2791
2792
2793	DECLHIDDEN(int) dbgcGdbStubCreate(PUVM pUVM, PDBGCBACK pBack, unsigned fFlags)
2794	{
2795	/*
2796	* Validate input.
2797	*/
2798	AssertPtrNullReturn(pUVM, VERR_INVALID_VM_HANDLE);
2799	PVM pVM = NULL;
2800	if (pUVM)
2801	{
2802	pVM = VMR3GetVM(pUVM);
2803	AssertPtrReturn(pVM, VERR_INVALID_VM_HANDLE);
2804	}
2805
2806	/*
2807	* Allocate and initialize instance data
2808	*/
2809	PGDBSTUBCTX pThis;
2810	int rc = dbgcGdbStubCtxCreate(&pThis, pBack, fFlags);
2811	if (RT_FAILURE(rc))
2812	return rc;
2813	if (!HMR3IsEnabled(pUVM) && !NEMR3IsEnabled(pUVM))
2814	pThis->Dbgc.hDbgAs = DBGF_AS_RC_AND_GC_GLOBAL;
2815
2816	/*
2817	* Attach to the specified VM.
2818	*/
2819	if (RT_SUCCESS(rc) && pUVM)
2820	{
2821	rc = DBGFR3Attach(pUVM);
2822	if (RT_SUCCESS(rc))
2823	{
2824	pThis->Dbgc.pVM = pVM;
2825	pThis->Dbgc.pUVM = pUVM;
2826	pThis->Dbgc.idCpu = 0;
2827	}
2828	else
2829	rc = pThis->Dbgc.CmdHlp.pfnVBoxError(&pThis->Dbgc.CmdHlp, rc, "When trying to attach to VM %p\n", pThis->Dbgc.pVM);
2830	}
2831
2832	/*
2833	* Load plugins.
2834	*/
2835	if (RT_SUCCESS(rc))
2836	{
2837	if (pVM)
2838	DBGFR3PlugInLoadAll(pThis->Dbgc.pUVM);
2839	dbgcEventInit(&pThis->Dbgc);
2840	//dbgcRunInitScripts(pDbgc); Not yet
2841
2842	if (!DBGFR3IsHalted(pThis->Dbgc.pUVM))
2843	rc = DBGFR3Halt(pThis->Dbgc.pUVM);
2844
2845	/*
2846	* Run the debugger main loop.
2847	*/
2848	rc = dbgcGdbStubRun(pThis);
2849	dbgcEventTerm(&pThis->Dbgc);
2850	}
2851
2852	/*
2853	* Cleanup console debugger session.
2854	*/
2855	dbgcGdbStubDestroy(pThis);
2856	return rc == VERR_DBGC_QUIT ? VINF_SUCCESS : rc;
2857	}
2858

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source: vbox/trunk/src/VBox/Debugger/DBGCGdbRemoteStub.cpp@ 85972

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