mirror of
https://github.com/reactos/reactos.git
synced 2024-12-29 10:35:28 +00:00
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
|
|
* COPYRIGHT: GPL, see COPYING in the top level directory
|
|
* PROJECT: ReactOS kernel
|
|
* FILE: drivers/base/kddll/gdb_receive.c
|
|
* PURPOSE: Base functions for the kernel debugger.
|
|
*/
|
|
|
|
#include "kdgdb.h"
|
|
|
|
/* GLOBALS ********************************************************************/
|
|
CHAR gdb_input[0x1000];
|
|
|
|
/* GLOBAL FUNCTIONS ***********************************************************/
|
|
char
|
|
hex_value(char ch)
|
|
{
|
|
if ((ch >= '0') && (ch <= '9'))
|
|
return (ch - '0');
|
|
|
|
if ((ch >= 'a') && (ch <= 'f'))
|
|
return (ch - 'a' + 10);
|
|
|
|
if ((ch >= 'A') && (ch <= 'F'))
|
|
return (ch - 'A' + 10);
|
|
|
|
return -1;
|
|
}
|
|
|
|
KDSTATUS
|
|
NTAPI
|
|
gdb_receive_packet(_Inout_ PKD_CONTEXT KdContext)
|
|
{
|
|
UCHAR* ByteBuffer;
|
|
UCHAR Byte;
|
|
KDSTATUS Status;
|
|
CHAR CheckSum, ReceivedCheckSum;
|
|
|
|
do
|
|
{
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KdPacketReceived)
|
|
return Status;
|
|
} while (Byte != '$');
|
|
|
|
get_packet:
|
|
CheckSum = 0;
|
|
ByteBuffer = (UCHAR*)gdb_input;
|
|
|
|
while (TRUE)
|
|
{
|
|
/* Try to get a byte from the port */
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KdPacketReceived)
|
|
return Status;
|
|
|
|
if (Byte == '#')
|
|
{
|
|
*ByteBuffer = '\0';
|
|
break;
|
|
}
|
|
CheckSum += (CHAR)Byte;
|
|
|
|
/* See if we should escape */
|
|
if (Byte == 0x7d)
|
|
{
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KdPacketReceived)
|
|
return Status;
|
|
CheckSum += (CHAR)Byte;
|
|
Byte ^= 0x20;
|
|
}
|
|
*ByteBuffer++ = Byte;
|
|
}
|
|
|
|
/* Get Check sum (two bytes) */
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KdPacketReceived)
|
|
goto end;
|
|
ReceivedCheckSum = hex_value(Byte) << 4;
|
|
|
|
Status = KdpReceiveByte(&Byte);
|
|
if (Status != KdPacketReceived)
|
|
goto end;
|
|
ReceivedCheckSum += hex_value(Byte);
|
|
|
|
end:
|
|
if (ReceivedCheckSum != CheckSum)
|
|
{
|
|
/* Do not acknowledge to GDB */
|
|
KDDBGPRINT("Check sums don't match!");
|
|
KdpSendByte('-');
|
|
return KdPacketNeedsResend;
|
|
}
|
|
|
|
/* Ensure there is nothing left in the pipe */
|
|
while (KdpPollByte(&Byte) == KdPacketReceived)
|
|
{
|
|
switch (Byte)
|
|
{
|
|
case '$':
|
|
KDDBGPRINT("Received new packet just after %s.\n", gdb_input);
|
|
goto get_packet;
|
|
case 0x03:
|
|
KdContext->KdpControlCPending = TRUE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Acknowledge */
|
|
KdpSendByte('+');
|
|
|
|
return KdPacketReceived;
|
|
}
|