/** ‘P n...=r...’
Writes the new value of n-th register received into the input buffer to the n-th register
@param SystemContext Register content at time of the exception
@param InBuffer Ponter to the input buffer received from gdb server
**/
VOID
EFIAPI
WriteNthRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
)
{
UINTN RegNumber;
CHAR8 RegNumBuffer[MAX_REG_NUM_BUF_SIZE]; // put the 'n..' part of the message into this array
CHAR8 *RegNumBufPtr;
CHAR8 *InBufPtr; // pointer to the input buffer
// find the register number to write
InBufPtr = &InBuffer[1];
RegNumBufPtr = RegNumBuffer;
while (*InBufPtr != '=') {
*RegNumBufPtr++ = *InBufPtr++;
}
*RegNumBufPtr = '\0';
RegNumber = AsciiStrHexToUintn (RegNumBuffer);
// check if this is a valid Register Number
if ((RegNumber < 0) || (RegNumber >= sizeof (gRegisterOffsets)/sizeof (UINTN))) {
SendError (GDB_EINVALIDREGNUM);
return;
}
InBufPtr++; // skips the '=' character
BasicWriteRegister (SystemContext, RegNumber, InBufPtr);
SendSuccess();
}
/** ‘G XX...’
Writes the new values received into the input buffer to the general registers
@param SystemContext Register content at time of the exception
@param InBuffer Pointer to the input buffer received from gdb server
**/
VOID
EFIAPI
WriteGeneralRegisters (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
)
{
UINTN i;
CHAR8 *InBufPtr; /// pointer to the input buffer
// check to see if the buffer is the right size which is
// 1 (for 'G') + 16 (for 16 registers) * 8 ( for 8 hex chars each) = 129
if (AsciiStrLen(InBuffer) != 129) { // 16 regs, 8 hex chars each, and the end '\0' (escape seq)
//Bad message. Message is not the right length
SendError (GDB_EBADBUFSIZE);
return;
}
InBufPtr = &InBuffer[1];
// Read the new values for the registers from the input buffer to an array, NewValueArray.
// The values in the array are in the gdb ordering
for(i=0; i < sizeof (gRegisterOffsets)/sizeof (UINTN); i++) { // there are only 16 registers to write
InBufPtr = BasicWriteRegister(SystemContext, i, InBufPtr);
}
SendSuccess();
}
VOID
EFIAPI
WriteGeneralRegisters (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
)
{
UINTN i;
CHAR8 *InBufPtr; /// pointer to the input buffer
UINTN MinLength;
UINTN RegisterCount = (sizeof (gRegisterOffsets)/sizeof (UINTN));
MinLength = (RegisterCount * 8) + 1; // 'G' plus the registers in ASCII format
if (AsciiStrLen(InBuffer) < MinLength) {
//Bad message. Message is not the right length
SendError (GDB_EBADBUFSIZE);
return;
}
InBufPtr = &InBuffer[1];
// Read the new values for the registers from the input buffer to an array, NewValueArray.
// The values in the array are in the gdb ordering
for(i = 0; i < RegisterCount; i++) {
InBufPtr = BasicWriteRegister (SystemContext, i, InBufPtr);
}
SendSuccess ();
}
