1 /****************************************************************************
3 THIS SOFTWARE IS NOT COPYRIGHTED
5 HP offers the following for use in the public domain. HP makes no
6 warranty with regard to the software or it's performance and the
7 user accepts the software "AS IS" with all faults.
9 HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
10 TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
11 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
13 ****************************************************************************/
15 /****************************************************************************
16 * Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
18 * Module name: remcom.c $
20 * Date: 91/03/09 12:29:49 $
21 * Contributor: Lake Stevens Instrument Division$
23 * Description: low level support for gdb debugger. $
25 * Considerations: only works on target hardware $
27 * Written by: Glenn Engel $
28 * ModuleState: Experimental $
32 * Modified for 386 by Jim Kingdon, Cygnus Support.
33 * Modified for ReactOS by Casper S. Hornstrup <chorns@users.sourceforge.net>
35 * To enable debugger support, two things need to happen. One, setting
36 * up a routine so that it is in the exception path, is necessary in order
37 * to allow any breakpoints or error conditions to be properly intercepted
38 * and reported to gdb.
39 * Two, a breakpoint needs to be generated to begin communication.
41 * Because gdb will sometimes write to the stack area to execute function
42 * calls, this program cannot rely on using the supervisor stack so it
43 * uses it's own stack area.
47 * The following gdb commands are supported:
49 * command function Return value
51 * g return the value of the CPU Registers hex data or ENN
52 * G set the value of the CPU Registers OK or ENN
54 * mAA..AA,LLLL Read LLLL bytes at address AA..AA hex data or ENN
55 * MAA..AA,LLLL: Write LLLL bytes at address AA.AA OK or ENN
57 * c Resume at current address SNN ( signal NN)
58 * cAA..AA Continue at address AA..AA SNN
60 * s Step one instruction SNN
61 * sAA..AA Step one instruction from AA..AA SNN
65 * ? What was the last sigval ? SNN (signal NN)
67 * All commands and responses are sent with a packet which includes a
68 * Checksum. A packet consists of
70 * $<packet info>#<Checksum>.
73 * <packet info> :: <characters representing the command or response>
74 * <Checksum> :: < two hex digits computed as modulo 256 sum of <packetinfo>>
76 * When a packet is received, it is first acknowledged with either '+' or '-'.
77 * '+' indicates a successful transfer. '-' indicates a failed transfer.
82 * $m0,10#2a +$00010203040506070809101112131415#42
84 ****************************************************************************/
88 #include <internal/debug.h>
89 #include <internal/ps.h>
91 /************************************************************************/
92 /* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
93 /* at least NUMREGBYTES*2 are needed for register packets */
96 static BOOLEAN GspInitialized
;
98 static PKINTERRUPT GspInterrupt
;
101 static BOOLEAN GspRemoteDebug
;
103 static CONST CHAR HexChars
[]="0123456789abcdef";
105 static PETHREAD GspRunThread
; /* NULL means run all threads */
106 static PETHREAD GspDbgThread
;
107 static PETHREAD GspEnumThread
;
109 extern LIST_ENTRY PsActiveProcessHead
;
110 KD_PORT_INFORMATION GdbPortInfo
= { 2, 115200, 0 }; /* FIXME hardcoded for COM2, 115200 baud */
112 /* Number of Registers. */
117 EAX
, ECX
, EDX
, EBX
, ESP
, EBP
, ESI
, EDI
,
118 PC
/* also known as eip */,
119 PS
/* also known as eflags */,
120 CS
, SS
, DS
, ES
, FS
, GS
123 typedef struct _CPU_REGISTER
127 DWORD OffsetInContext
;
128 BOOLEAN SetInContext
;
129 } CPU_REGISTER
, *PCPU_REGISTER
;
131 #define KTRAP_FRAME_X86 KTRAP_FRAME
138 (*PKSYSTEM_ROUTINE
)(PKSTART_ROUTINE StartRoutine
,
143 KiThreadStartup(PKSYSTEM_ROUTINE SystemRoutine
,
144 PKSTART_ROUTINE StartRoutine
,
147 KTRAP_FRAME TrapFrame
);
149 static CPU_REGISTER GspRegisters
[NUMREGS
] =
151 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Eax
), FIELD_OFFSET (CONTEXT
, Eax
), TRUE
},
152 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Ecx
), FIELD_OFFSET (CONTEXT
, Ecx
), TRUE
},
153 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Edx
), FIELD_OFFSET (CONTEXT
, Edx
), FALSE
},
154 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Ebx
), FIELD_OFFSET (CONTEXT
, Ebx
), TRUE
},
155 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Esp
), FIELD_OFFSET (CONTEXT
, Esp
), TRUE
},
156 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Ebp
), FIELD_OFFSET (CONTEXT
, Ebp
), TRUE
},
157 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Esi
), FIELD_OFFSET (CONTEXT
, Esi
), TRUE
},
158 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Edi
), FIELD_OFFSET (CONTEXT
, Edi
), TRUE
},
159 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Eip
), FIELD_OFFSET (CONTEXT
, Eip
), TRUE
},
160 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Eflags
), FIELD_OFFSET (CONTEXT
, EFlags
), TRUE
},
161 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Cs
), FIELD_OFFSET (CONTEXT
, SegCs
), TRUE
},
162 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Ss
), FIELD_OFFSET (CONTEXT
, SegSs
), TRUE
},
163 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Ds
), FIELD_OFFSET (CONTEXT
, SegDs
), TRUE
},
164 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Es
), FIELD_OFFSET (CONTEXT
, SegEs
), TRUE
},
165 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Fs
), FIELD_OFFSET (CONTEXT
, SegFs
), TRUE
},
166 { 4, FIELD_OFFSET (KTRAP_FRAME_X86
, Gs
), FIELD_OFFSET (CONTEXT
, SegGs
), TRUE
}
169 static PCHAR GspThreadStates
[DeferredReady
+1] =
184 if ((ch
>= '0') && (ch
<= '9')) return (ch
- '0');
185 if ((ch
>= 'a') && (ch
<= 'f')) return (ch
- 'a' + 10);
186 if ((ch
>= 'A') && (ch
<= 'F')) return (ch
- 'A' + 10);
190 static CHAR GspInBuffer
[BUFMAX
];
191 static CHAR GspOutBuffer
[BUFMAX
];
194 GdbPutChar(UCHAR Value
)
196 KdPortPutByteEx (&GdbPortInfo
, Value
);
204 while (!KdPortGetByteEx (&GdbPortInfo
, &Value
));
209 /* scan for the sequence $<data>#<Checksum> */
214 PCHAR Buffer
= &GspInBuffer
[0];
222 /* wait around for the start character, ignore all other characters */
223 while ((ch
= GdbGetChar ()) != '$');
230 /* now, read until a # or end of Buffer is found */
231 while (Count
< BUFMAX
)
238 Checksum
= Checksum
+ ch
;
247 XmitChecksum
= (CHAR
)(HexValue (ch
) << 4);
249 XmitChecksum
+= (CHAR
)(HexValue (ch
));
251 if (Checksum
!= XmitChecksum
)
253 GdbPutChar ('-'); /* failed checksum */
257 GdbPutChar ('+'); /* successful transfer */
259 /* if a sequence char is present, reply the sequence ID */
260 if (Buffer
[2] == ':')
262 GdbPutChar (Buffer
[0]);
263 GdbPutChar (Buffer
[1]);
274 /* send the packet in Buffer. */
277 GspPutPacket (PCHAR Buffer
)
283 /* $<packet info>#<Checksum>. */
290 while ((ch
= Buffer
[Count
]))
298 GdbPutChar (HexChars
[(Checksum
>> 4) & 0xf]);
299 GdbPutChar (HexChars
[Checksum
& 0xf]);
301 while (GdbGetChar () != '+');
306 GspPutPacketNoWait (PCHAR Buffer
)
312 /* $<packet info>#<Checksum>. */
317 while ((ch
= Buffer
[Count
]))
325 GdbPutChar (HexChars
[(Checksum
>> 4) & 0xf]);
326 GdbPutChar (HexChars
[Checksum
& 0xf]);
329 /* Indicate to caller of GspMem2Hex or GspHex2Mem that there has been an
331 static volatile BOOLEAN GspMemoryError
= FALSE
;
332 static volatile void *GspAccessLocation
= NULL
;
335 /* Convert the memory pointed to by Address into hex, placing result in Buffer */
336 /* Return a pointer to the last char put in Buffer (null) */
337 /* If MayFault is TRUE, then we should set GspMemoryError in response to
338 a fault; if FALSE treat a fault like any other fault in the stub. */
340 GspMem2Hex (PCHAR Address
,
348 if (NULL
== Address
&& MayFault
)
350 GspMemoryError
= TRUE
;
354 for (i
= 0; i
< (ULONG
) Count
; i
++)
357 GspAccessLocation
= Address
;
359 GspAccessLocation
= NULL
;
360 if (MayFault
&& GspMemoryError
)
364 *Buffer
++ = HexChars
[(ch
>> 4) & 0xf];
365 *Buffer
++ = HexChars
[ch
& 0xf];
373 /* Convert the hex array pointed to by Buffer into binary to be placed at Address */
374 /* Return a pointer to the character AFTER the last byte read from Buffer */
376 GspHex2Mem (PCHAR Buffer
,
389 while ( current
< Address
+ Count
)
391 page
= (PCHAR
)PAGE_ROUND_DOWN (current
);
392 if (Address
+ Count
<= page
+ PAGE_SIZE
)
394 /* Fits in this page */
399 /* Flows into next page, handle only current page in this iteration */
400 countinpage
= PAGE_SIZE
- (Address
- page
);
404 oldprot
= MmGetPageProtect (NULL
, Address
);
405 MmSetPageProtect (NULL
, Address
, PAGE_EXECUTE_READWRITE
);
408 for (i
= 0; i
< countinpage
&& ! GspMemoryError
; i
++)
410 ch
= (CHAR
)(HexValue (*Buffer
++) << 4);
411 ch
= (CHAR
)(ch
+ HexValue (*Buffer
++));
413 GspAccessLocation
= current
;
415 GspAccessLocation
= NULL
;
420 MmSetPageProtect (NULL
, page
, oldprot
);
432 /* This function takes the 386 exception vector and attempts to
433 translate this number into a unix compatible signal value */
435 GspComputeSignal (NTSTATUS ExceptionCode
)
439 switch (ExceptionCode
)
441 case STATUS_INTEGER_DIVIDE_BY_ZERO
:
443 break; /* divide by zero */
444 case STATUS_SINGLE_STEP
:
445 /* debug exception */
446 case STATUS_BREAKPOINT
:
448 break; /* breakpoint */
449 case STATUS_INTEGER_OVERFLOW
:
450 /* into instruction (overflow) */
451 case STATUS_ARRAY_BOUNDS_EXCEEDED
:
453 break; /* bound instruction */
454 case STATUS_ILLEGAL_INSTRUCTION
:
456 break; /* Invalid opcode */
458 case STATUS_FLT_INVALID_OPERATION
:
460 break; /* coprocessor not available */
462 case STATUS_STACK_OVERFLOW
:
463 /* stack exception */
464 case STATUS_DATATYPE_MISALIGNMENT
:
466 case STATUS_ACCESS_VIOLATION
:
467 SigVal
= 11; /* access violation */
470 SigVal
= 7; /* "software generated" */
476 /**********************************************/
477 /* WHILE WE FIND NICE HEX CHARS, BUILD A LONG */
478 /* RETURN NUMBER OF CHARS PROCESSED */
479 /**********************************************/
481 GspHex2Long (PCHAR
*Address
,
491 Hex
= HexValue (**Address
);
494 *Value
= (*Value
<< 4) | Hex
;
508 GspLong2Hex (PCHAR
*Address
,
513 Save
= (((Value
>> 0) & 0xff) << 24) |
514 (((Value
>> 8) & 0xff) << 16) |
515 (((Value
>> 16) & 0xff) << 8) |
516 (((Value
>> 24) & 0xff) << 0);
517 *Address
= GspMem2Hex ((PCHAR
) &Save
, *Address
, 4, FALSE
);
522 * When coming from kernel mode, Esp is not stored in the trap frame.
523 * Instead, it was pointing to the location of the TrapFrame Esp member
524 * when the exception occured. When coming from user mode, Esp is just
525 * stored in the TrapFrame Esp member.
528 GspGetEspFromTrapFrame(PKTRAP_FRAME TrapFrame
)
531 return KeGetPreviousMode() == KernelMode
532 ? (LONG
) &TrapFrame
->Esp
: TrapFrame
->Esp
;
537 GspGetRegistersFromTrapFrame(PCHAR Address
,
539 PKTRAP_FRAME TrapFrame
)
547 for (i
= 0; i
< sizeof (GspRegisters
) / sizeof (GspRegisters
[0]); i
++)
553 Value
= GspGetEspFromTrapFrame (TrapFrame
);
557 p
= (PULONG
) ((ULONG_PTR
) TrapFrame
+ GspRegisters
[i
].OffsetInTF
);
561 else if (i
== EIP_REGNO
)
564 * This thread has not been sheduled yet so assume it
565 * is still in PsBeginThreadWithContextInternal().
567 Value
= (ULONG
)KiThreadStartup
;
573 Buffer
= GspMem2Hex ((PCHAR
) &Value
, Buffer
, GspRegisters
[i
].Size
, FALSE
);
579 GspSetRegistersInTrapFrame(PCHAR Address
,
581 PKTRAP_FRAME TrapFrame
)
592 for (i
= 0; i
< NUMREGS
; i
++)
594 if (GspRegisters
[i
].SetInContext
)
595 p
= (PULONG
) ((ULONG_PTR
) Context
+ GspRegisters
[i
].OffsetInContext
);
597 p
= (PULONG
) ((ULONG_PTR
) TrapFrame
+ GspRegisters
[i
].OffsetInTF
);
599 Buffer
= GspHex2Mem (Buffer
, (PCHAR
) &Value
, GspRegisters
[i
].Size
, FALSE
);
606 GspSetSingleRegisterInTrapFrame(PCHAR Address
,
609 PKTRAP_FRAME TrapFrame
)
617 if (GspRegisters
[Number
].SetInContext
)
618 p
= (PULONG
) ((ULONG_PTR
) Context
+ GspRegisters
[Number
].OffsetInContext
);
620 p
= (PULONG
) ((ULONG_PTR
) TrapFrame
+ GspRegisters
[Number
].OffsetInTF
);
622 GspHex2Mem (Address
, (PCHAR
) &Value
, GspRegisters
[Number
].Size
, FALSE
);
628 GspFindThread(PCHAR Data
,
631 PETHREAD ThreadInfo
= NULL
;
633 if (strcmp (Data
, "-1") == 0)
642 PCHAR ptr
= &Data
[0];
644 GspHex2Long (&ptr
, (PULONG
) &uThreadId
);
645 ThreadId
= (HANDLE
)uThreadId
;
647 if (!NT_SUCCESS (PsLookupThreadByThreadId (ThreadId
, &ThreadInfo
)))
653 *Thread
= ThreadInfo
;
659 GspSetThread(PCHAR Request
)
662 PCHAR ptr
= &Request
[1];
666 case 'c': /* Run thread */
667 if (GspFindThread (ptr
, &ThreadInfo
))
669 GspOutBuffer
[0] = 'O';
670 GspOutBuffer
[1] = 'K';
672 if (NULL
!= GspRunThread
)
674 ObDereferenceObject(GspRunThread
);
676 GspRunThread
= ThreadInfo
;
677 if (NULL
!= GspRunThread
)
679 ObReferenceObject(GspRunThread
);
684 GspOutBuffer
[0] = 'E';
687 case 'g': /* Debug thread */
688 if (GspFindThread (ptr
, &ThreadInfo
))
690 GspOutBuffer
[0] = 'O';
691 GspOutBuffer
[1] = 'K';
693 if(GspDbgThread
) ObDereferenceObject(GspDbgThread
);
695 GspDbgThread
= ThreadInfo
;
699 GspOutBuffer
[0] = 'E';
709 GspQuery(PCHAR Request
)
714 Command
= strtok (Request
, ",");
715 if (strncmp (Command
, "C", 1) == 0)
717 PCHAR ptr
= &GspOutBuffer
[2];
719 /* Get current thread id */
720 GspOutBuffer
[0] = 'Q';
721 GspOutBuffer
[1] = 'C';
722 if (NULL
!= GspDbgThread
)
724 Value
= (ULONG
) GspDbgThread
->Cid
.UniqueThread
;
728 Value
= (ULONG
) PsGetCurrentThread()->Cid
.UniqueThread
;
730 GspLong2Hex (&ptr
, Value
);
732 else if (strncmp (Command
, "fThreadInfo", 11) == 0)
735 PLIST_ENTRY AThread
, AProcess
;
736 PCHAR ptr
= &GspOutBuffer
[1];
738 /* Get first thread id */
739 GspEnumThread
= NULL
;
740 AProcess
= PsActiveProcessHead
.Flink
;
741 while(AProcess
!= &PsActiveProcessHead
)
743 Process
= CONTAINING_RECORD(AProcess
, EPROCESS
, ProcessListEntry
);
744 AThread
= Process
->ThreadListHead
.Flink
;
745 if(AThread
!= &Process
->ThreadListHead
)
747 GspEnumThread
= CONTAINING_RECORD (Process
->ThreadListHead
.Flink
,
748 ETHREAD
, ThreadListEntry
);
751 AProcess
= AProcess
->Flink
;
753 if(GspEnumThread
!= NULL
)
755 GspOutBuffer
[0] = 'm';
756 Value
= (ULONG
) GspEnumThread
->Cid
.UniqueThread
;
757 GspLong2Hex (&ptr
, Value
);
761 /* FIXME - what to do here? This case should never happen though, there
762 should always be at least one thread on the system... */
763 /* GspOutBuffer[0] = 'l'; */
766 else if (strncmp (Command
, "sThreadInfo", 11) == 0)
769 PLIST_ENTRY AThread
, AProcess
;
770 PCHAR ptr
= &GspOutBuffer
[1];
772 /* Get next thread id */
773 if (GspEnumThread
!= NULL
)
775 /* find the next thread */
776 Process
= GspEnumThread
->ThreadsProcess
;
777 if(GspEnumThread
->ThreadListEntry
.Flink
!= &Process
->ThreadListHead
)
779 GspEnumThread
= CONTAINING_RECORD (GspEnumThread
->ThreadListEntry
.Flink
,
780 ETHREAD
, ThreadListEntry
);
784 PETHREAD Thread
= NULL
;
785 AProcess
= Process
->ProcessListEntry
.Flink
;
786 while(AProcess
!= &PsActiveProcessHead
)
788 Process
= CONTAINING_RECORD(AProcess
, EPROCESS
, ProcessListEntry
);
789 AThread
= Process
->ThreadListHead
.Flink
;
790 if(AThread
!= &Process
->ThreadListHead
)
792 Thread
= CONTAINING_RECORD (Process
->ThreadListHead
.Flink
,
793 ETHREAD
, ThreadListEntry
);
796 AProcess
= AProcess
->Flink
;
798 GspEnumThread
= Thread
;
801 if(GspEnumThread
!= NULL
)
804 GspOutBuffer
[0] = 'm';
805 Value
= (ULONG
) GspEnumThread
->Cid
.UniqueThread
;
806 GspLong2Hex (&ptr
, Value
);
810 GspOutBuffer
[0] = 'l';
815 GspOutBuffer
[0] = 'l';
818 else if (strncmp (Command
, "ThreadExtraInfo", 15) == 0)
821 PCHAR ptr
= &Command
[15];
823 /* Get thread information */
824 if (GspFindThread (ptr
, &ThreadInfo
))
826 PCHAR String
= GspThreadStates
[ThreadInfo
->Tcb
.State
];
828 ObDereferenceObject(ThreadInfo
);
830 GspMem2Hex (String
, &GspOutBuffer
[0], strlen (String
), FALSE
);
834 else if (strncmp (Command
, "L", 1) == 0)
836 PLIST_ENTRY CurrentEntry
;
838 ULONG MaxThreads
= 0;
840 ULONG ThreadCount
= 0;
843 GspHex2Mem (&Request
[1], (PCHAR
) &MaxThreads
, 2, TRUE
);
844 GspHex2Mem (&Request
[3], (PCHAR
) &Value
, 4, TRUE
);
845 GspHex2Mem (&Request
[11], (PCHAR
) &ThreadId
, 4, TRUE
);
847 GspOutBuffer
[0] = 'q';
848 GspOutBuffer
[1] = 'M';
850 GspMem2Hex ((PCHAR
) &Value
, &GspOutBuffer
[5], 4, TRUE
);
851 GspMem2Hex ((PCHAR
) &ThreadId
, &GspOutBuffer
[13], 4, TRUE
);
853 CurrentEntry
= PiThreadListHead
.Flink
;
854 while ((CurrentEntry
!= &PiThreadListHead
) && (ThreadCount
< MaxThreads
))
856 Current
= CONTAINING_RECORD (CurrentEntry
, ETHREAD
, Tcb
.ThreadListEntry
);
858 GspMem2Hex ((PCHAR
) &Value
, &GspOutBuffer
[21+ThreadCount
*16], 4, TRUE
);
859 Value
= (ULONG
) Current
->Cid
.UniqueThread
;
860 GspMem2Hex ((PCHAR
) &Value
, &GspOutBuffer
[21+ThreadCount
*16+8], 4, TRUE
);
861 CurrentEntry
= CurrentEntry
->Flink
;
865 if (CurrentEntry
!= &PiThreadListHead
)
867 GspOutBuffer
[4] = '0';
871 GspOutBuffer
[4] = '1';
874 GspMem2Hex ((PCHAR
) &ThreadCount
, &GspOutBuffer
[2], 1, TRUE
);
877 else if (strncmp (Command
, "Offsets", 7) == 0)
879 strcpy (GspOutBuffer
, "Text=0;Data=0;Bss=0");
884 GspQueryThreadStatus(PCHAR Request
)
887 PCHAR ptr
= &Request
[0];
889 if (GspFindThread (ptr
, &ThreadInfo
))
891 ObDereferenceObject(ThreadInfo
);
893 GspOutBuffer
[0] = 'O';
894 GspOutBuffer
[1] = 'K';
895 GspOutBuffer
[2] = '\0';
899 GspOutBuffer
[0] = 'E';
900 GspOutBuffer
[1] = '\0';
905 typedef struct _GsHwBreakPoint
913 #if defined(__GNUC__)
914 GsHwBreakPoint GspBreakpoints
[4] =
922 GsHwBreakPoint GspBreakpoints
[4] =
932 GspCorrectHwBreakpoint()
934 ULONG BreakpointNumber
;
939 #if defined(__GNUC__)
941 "movl %%db7, %0\n" : "=r" (dr7_
) : );
944 ULONG addr0
, addr1
, addr2
, addr3
;
951 : "=r" (addr0
), "=r" (addr1
),
952 "=r" (addr2
), "=r" (addr3
) : );
954 #elif defined(_MSC_VER)
957 mov eax
, dr7
; mov dr7_
, eax
;
958 mov eax
, dr0
; mov addr0
, eax
;
959 mov eax
, dr1
; mov addr1
, eax
;
960 mov eax
, dr2
; mov addr2
, eax
;
961 mov eax
, dr3
; mov addr3
, eax
;
964 #error Unknown compiler for inline assembler
967 for (BreakpointNumber
= 0; BreakpointNumber
< 3; BreakpointNumber
++)
969 Bit
= 2 << (BreakpointNumber
<< 1);
970 if (!(dr7_
& Bit
) && GspBreakpoints
[BreakpointNumber
].Enabled
) {
973 dr7_
&= ~(0xf0000 << (BreakpointNumber
<< 2));
974 dr7_
|= (((GspBreakpoints
[BreakpointNumber
].Length
<< 2) |
975 GspBreakpoints
[BreakpointNumber
].Type
) << 16) << (BreakpointNumber
<< 2);
976 switch (BreakpointNumber
) {
977 #if defined(__GNUC__)
979 asm volatile ("movl %0, %%dr0\n"
980 : : "r" (GspBreakpoints
[BreakpointNumber
].Address
) );
984 asm volatile ("movl %0, %%dr1\n"
985 : : "r" (GspBreakpoints
[BreakpointNumber
].Address
) );
989 asm volatile ("movl %0, %%dr2\n"
990 : : "r" (GspBreakpoints
[BreakpointNumber
].Address
) );
994 asm volatile ("movl %0, %%dr3\n"
995 : : "r" (GspBreakpoints
[BreakpointNumber
].Address
) );
997 #elif defined(_MSC_VER)
1000 ULONG addr
= GspBreakpoints
[BreakpointNumber
].Address
;
1001 __asm mov eax
, addr
;
1007 ULONG addr
= GspBreakpoints
[BreakpointNumber
].Address
;
1008 __asm mov eax
, addr
;
1014 ULONG addr
= GspBreakpoints
[BreakpointNumber
].Address
;
1015 __asm mov eax
, addr
;
1021 ULONG addr
= GspBreakpoints
[BreakpointNumber
].Address
;
1022 __asm mov eax
, addr
;
1027 #error Unknown compiler for inline assembler
1031 else if ((dr7_
& Bit
) && !GspBreakpoints
[BreakpointNumber
].Enabled
)
1035 dr7_
&= ~(0xf0000 << (BreakpointNumber
<< 2));
1040 #if defined(__GNUC__)
1041 asm volatile ( "movl %0, %%db7\n" : : "r" (dr7_
));
1042 #elif defined(_MSC_VER)
1043 __asm mov eax
, dr7_
;
1046 #error Unknown compiler for inline assembler
1052 GspRemoveHwBreakpoint(ULONG BreakpointNumber
)
1054 if (!GspBreakpoints
[BreakpointNumber
].Enabled
)
1058 GspBreakpoints
[BreakpointNumber
].Enabled
= 0;
1064 GspSetHwBreakpoint(ULONG BreakpointNumber
,
1069 if (GspBreakpoints
[BreakpointNumber
].Enabled
)
1073 GspBreakpoints
[BreakpointNumber
].Enabled
= TRUE
;
1074 GspBreakpoints
[BreakpointNumber
].Type
= Type
;
1075 GspBreakpoints
[BreakpointNumber
].Length
= Length
;
1076 GspBreakpoints
[BreakpointNumber
].Address
= Address
;
1082 * This function does all command procesing for interfacing to gdb.
1086 KdpGdbEnterDebuggerException(PEXCEPTION_RECORD ExceptionRecord
,
1088 PKTRAP_FRAME TrapFrame
)
1098 /* FIXME: Stop on other CPUs too */
1099 /* Disable hardware debugging while we are inside the stub */
1100 #if defined(__GNUC__)
1101 __asm__("movl %0,%%db7" : /* no output */ : "r" (0));
1102 #elif defined(_MSC_VER)
1103 __asm mov eax
, 0 __asm mov dr7
, eax
1105 #error Unknown compiler for inline assembler
1108 if (STATUS_ACCESS_VIOLATION
== (NTSTATUS
) ExceptionRecord
->ExceptionCode
&&
1109 NULL
!= GspAccessLocation
&&
1110 (ULONG_PTR
) GspAccessLocation
==
1111 (ULONG_PTR
) ExceptionRecord
->ExceptionInformation
[1])
1113 GspAccessLocation
= NULL
;
1114 GspMemoryError
= TRUE
;
1115 TrapFrame
->Eip
+= 2;
1119 /* Don't switch threads */
1121 /* Always use the current thread when entering the exception handler */
1122 if (NULL
!= GspDbgThread
)
1124 ObDereferenceObject(GspDbgThread
);
1125 GspDbgThread
= NULL
;
1128 /* reply to host that an exception has occurred */
1129 SigVal
= GspComputeSignal (ExceptionRecord
->ExceptionCode
);
1131 ptr
= &GspOutBuffer
[0];
1133 *ptr
++ = 'T'; /* notify gdb with signo, PC, FP and SP */
1134 *ptr
++ = HexChars
[(SigVal
>> 4) & 0xf];
1135 *ptr
++ = HexChars
[SigVal
& 0xf];
1137 *ptr
++ = HexChars
[ESP
];
1140 Esp
= GspGetEspFromTrapFrame (TrapFrame
); /* SP */
1141 ptr
= GspMem2Hex ((PCHAR
) &Esp
, ptr
, 4, 0);
1144 *ptr
++ = HexChars
[EBP
];
1146 ptr
= GspMem2Hex ((PCHAR
) &TrapFrame
->Ebp
, ptr
, 4, 0); /* FP */
1149 *ptr
++ = HexChars
[PC
];
1151 ptr
= GspMem2Hex((PCHAR
) &TrapFrame
->Eip
, ptr
, 4, 0); /* PC */
1156 GspPutPacket (&GspOutBuffer
[0]);
1162 /* Zero the buffer now so we don't have to worry about the terminating zero character */
1163 memset (GspOutBuffer
, 0, sizeof (GspInBuffer
));
1164 ptr
= GspGetPacket ();
1169 GspOutBuffer
[0] = 'S';
1170 GspOutBuffer
[1] = HexChars
[SigVal
>> 4];
1171 GspOutBuffer
[2] = HexChars
[SigVal
% 16];
1172 GspOutBuffer
[3] = 0;
1175 GspRemoteDebug
= !GspRemoteDebug
; /* toggle debug flag */
1177 case 'g': /* return the value of the CPU Registers */
1178 if (NULL
!= GspDbgThread
)
1180 GspGetRegistersFromTrapFrame (&GspOutBuffer
[0], Context
, GspDbgThread
->Tcb
.TrapFrame
);
1184 GspGetRegistersFromTrapFrame (&GspOutBuffer
[0], Context
, TrapFrame
);
1187 case 'G': /* set the value of the CPU Registers - return OK */
1188 if (NULL
!= GspDbgThread
)
1190 GspSetRegistersInTrapFrame (ptr
, Context
, GspDbgThread
->Tcb
.TrapFrame
);
1194 GspSetRegistersInTrapFrame (ptr
, Context
, TrapFrame
);
1196 strcpy (GspOutBuffer
, "OK");
1198 case 'P': /* set the value of a single CPU register - return OK */
1202 if ((GspHex2Long (&ptr
, &Register
)) && (*ptr
++ == '='))
1203 if ((Register
>= 0) && (Register
< NUMREGS
))
1207 GspSetSingleRegisterInTrapFrame(ptr
, Register
,
1208 Context
, GspDbgThread
->Tcb
.TrapFrame
);
1212 GspSetSingleRegisterInTrapFrame (ptr
, Register
, Context
, TrapFrame
);
1214 strcpy (GspOutBuffer
, "OK");
1218 strcpy (GspOutBuffer
, "E01");
1222 /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
1224 /* TRY TO READ %x,%x. IF SUCCEED, SET PTR = 0 */
1225 if (GspHex2Long (&ptr
, &Address
))
1226 if (*(ptr
++) == ',')
1227 if (GspHex2Long (&ptr
, &Length
))
1230 GspMemoryError
= FALSE
;
1231 GspMem2Hex ((PCHAR
) Address
, GspOutBuffer
, Length
, 1);
1234 strcpy (GspOutBuffer
, "E03");
1235 DPRINT ("Fault during memory read\n");
1240 strcpy (GspOutBuffer
, "E01");
1243 /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
1245 /* TRY TO READ '%x,%x:'. IF SUCCEED, SET PTR = 0 */
1246 if (GspHex2Long (&ptr
, &Address
))
1247 if (*(ptr
++) == ',')
1248 if (GspHex2Long (&ptr
, &Length
))
1249 if (*(ptr
++) == ':')
1251 GspMemoryError
= FALSE
;
1252 GspHex2Mem (ptr
, (PCHAR
) Address
, Length
, TRUE
);
1256 strcpy (GspOutBuffer
, "E03");
1257 DPRINT ("Fault during memory write\n");
1261 strcpy (GspOutBuffer
, "OK");
1267 strcpy (GspOutBuffer
, "E02");
1270 /* cAA..AA Continue at address AA..AA(optional) */
1271 /* sAA..AA Step one instruction from AA..AA(optional) */
1276 ULONG BreakpointNumber
;
1279 /* try to read optional parameter, pc unchanged if no parm */
1280 if (GspHex2Long (&ptr
, &Address
))
1281 Context
->Eip
= Address
;
1283 NewPC
= Context
->Eip
;
1285 /* clear the trace bit */
1286 Context
->EFlags
&= 0xfffffeff;
1288 /* set the trace bit if we're Stepping */
1290 Context
->EFlags
|= 0x100;
1292 #if defined(__GNUC__)
1293 asm volatile ("movl %%db6, %0\n" : "=r" (dr6_
) : );
1294 #elif defined(_MSC_VER)
1295 __asm mov eax
, dr6 __asm mov dr6_
, eax
;
1297 #error Unknown compiler for inline assembler
1299 if (!(dr6_
& 0x4000))
1301 for (BreakpointNumber
= 0; BreakpointNumber
< 4; ++BreakpointNumber
)
1303 if (dr6_
& (1 << BreakpointNumber
))
1305 if (GspBreakpoints
[BreakpointNumber
].Type
== 0)
1307 /* Set restore flag */
1308 Context
->EFlags
|= 0x10000;
1314 GspCorrectHwBreakpoint();
1315 #if defined(__GNUC__)
1316 asm volatile ("movl %0, %%db6\n" : : "r" (0));
1317 #elif defined(_MSC_VER)
1318 __asm mov eax
, 0 __asm mov dr6
, eax
;
1320 #error Unknown compiler for inline assembler
1323 KeContextToTrapFrame(Context
, TrapFrame
);
1324 return ((SigVal
== 5) ? (kdContinue
) : (kdHandleException
));
1328 case 'k': /* kill the program */
1329 strcpy (GspOutBuffer
, "OK");
1331 /* kill the program */
1333 case 'H': /* Set thread */
1337 case 'q': /* Query */
1341 case 'T': /* Query thread status */
1342 GspQueryThreadStatus (ptr
);
1352 ptr
= &GspOutBuffer
[1];
1353 GspHex2Long (&ptr
, &Number
);
1355 GspHex2Long (&ptr
, &Type
);
1357 GspHex2Long (&ptr
, &Length
);
1359 GspHex2Long (&ptr
, &Address
);
1360 if (GspSetHwBreakpoint (Number
& 0x3, Type
& 0x3 , Length
& 0x3, Address
) == 0)
1362 strcpy (GspOutBuffer
, "OK");
1366 strcpy (GspOutBuffer
, "E");
1371 /* Remove hardware breakpoint */
1376 ptr
= &GspOutBuffer
[1];
1377 GspHex2Long(&ptr
, &Number
);
1378 if (GspRemoveHwBreakpoint (Number
& 0x3) == 0)
1380 strcpy (GspOutBuffer
, "OK");
1384 strcpy (GspOutBuffer
, "E");
1393 /* reply to the request */
1394 GspPutPacket (&GspOutBuffer
[0]);
1401 return kdDoNotHandleException
;
1407 GspBreakIn(PKINTERRUPT Interrupt
,
1408 PVOID ServiceContext
)
1410 PKTRAP_FRAME TrapFrame
;
1416 DPRINT ("Break In\n");
1419 while (KdPortGetByteEx (&GdbPortInfo
, &Value
))
1428 KeRaiseIrql (HIGH_LEVEL
, &OldIrql
);
1430 TrapFrame
= PsGetCurrentThread()->Tcb
.TrapFrame
;
1432 KeTrapFrameToContext (TrapFrame
, &Context
);
1434 KdpGdbEnterDebuggerException (NULL
, &Context
, TrapFrame
);
1436 KeContextToTrapFrame (&Context
, TrapFrame
);
1438 KeLowerIrql (OldIrql
);
1444 extern ULONG KdpPortIrq
;
1449 KdpGdbDebugPrint(PCH Message
)
1452 /* This can be quite annoying! */
1457 GspOutBuffer
[0] = 'O';
1458 GspOutBuffer
[1] = '\0';
1459 strcat (&GspOutBuffer
[0], Message
);
1460 Length
= strlen (Message
);
1461 GspOutBuffer
[2 + Length
] = '\n';
1462 GspOutBuffer
[3 + Length
] = '\0';
1463 GspPutPacketNoWait (&GspOutBuffer
[0]);
1469 extern LIST_ENTRY ModuleListHead
;
1474 PLIST_ENTRY CurrentEntry
;
1475 PMODULE_OBJECT Current
;
1482 CurrentEntry
= ModuleListHead
.Flink
;
1483 while (CurrentEntry
!= (&ModuleListHead
))
1485 Current
= CONTAINING_RECORD (CurrentEntry
, MODULE_OBJECT
, ListEntry
);
1487 DbgPrint ("Module %S Base 0x%.08x Length 0x%.08x\n",
1488 Current
->BaseName
.Buffer
, Current
->Base
, Current
->Length
);
1491 CurrentEntry
= CurrentEntry
->Flink
;
1494 DbgPrint ("%d modules listed\n", ModuleCount
);
1497 /* Initialize the GDB stub */
1500 KdpGdbStubInit(PKD_DISPATCH_TABLE WrapperTable
,
1503 if (!KdDebuggerEnabled
|| !KdpDebugMode
.Gdb
) return;
1507 /* Write out the functions that we support for now */
1508 WrapperTable
->KdpInitRoutine
= KdpGdbStubInit
;
1509 WrapperTable
->KdpPrintRoutine
= KdpGdbDebugPrint
;
1510 WrapperTable
->KdpExceptionRoutine
= KdpGdbEnterDebuggerException
;
1512 /* Initialize the Port */
1513 KdPortInitializeEx(&GdbPortInfo
, 0, 0);
1515 else if (BootPhase
== 1)
1517 GspInitialized
= TRUE
;
1519 GspRunThread
= NULL
;
1520 GspDbgThread
= NULL
;
1521 GspEnumThread
= NULL
;
1523 HalDisplayString("Waiting for GDB to attach\n");
1524 DbgPrint("Module 'hal.dll' loaded at 0x%.08x.\n", LdrHalBase
);
1525 DbgBreakPointWithStatus (DBG_STATUS_CONTROL_C
);
1527 else if (BootPhase
== 2)
1529 HalDisplayString("\n GDB debugging enabled\n\n");