/** @file
Private include file for GDB stub
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#ifndef __GCC_DEBUG_AGENT_INTERNAL__
#define __GCC_DEBUG_AGENT_INTERNAL__
#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/GdbSerialLib.h>
#include <Library/PrintLib.h>
#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugAgentTimerLib.h>
#include <Library/DebugAgentLib.h>
#include <IndustryStandard/PeImage.h>
#include <Protocol/DebugSupport.h>
extern CONST CHAR8 mHexToStr[];
// maximum size of input and output buffers
// This value came from the show remote command of the gdb we tested against
#define MAX_BUF_SIZE 2000
// maximum size of address buffer
#define MAX_ADDR_SIZE 32
// maximum size of register number buffer
#define MAX_REG_NUM_BUF_SIZE 32
// maximum size of length buffer
#define MAX_LENGTH_SIZE 32
// maximum size of T signal members
#define MAX_T_SIGNAL_SIZE 64
// the mask used to clear all the cache
#define TF_BIT 0x00000100
//
// GDB Signal definitions - generic names for interrupts
//
#define GDB_SIGINT 2 // Interrupt process via ctrl-c
#define GDB_SIGILL 4 // Illegal instruction
#define GDB_SIGTRAP 5 // Trace Trap (Breakpoint and SingleStep)
#define GDB_SIGEMT 7 // Emulator Trap
#define GDB_SIGFPE 8 // Floating point exception
#define GDB_SIGSEGV 11 // Setgment violation, page fault
//
// GDB File I/O Error values, zero means no error
// Includes all general GDB Unix like error values
//
#define GDB_EBADMEMADDRBUFSIZE 11 // the buffer that stores memory Address to be read from/written to is not the right size
#define GDB_EBADMEMLENGBUFSIZE 12 // the buffer that stores Length is not the right size
#define GDB_EBADMEMLENGTH 13 // Length, the given number of bytes to read or write, is not the right size
#define GDB_EBADMEMDATA 14 // one of the bytes or nibbles of the memory is leess than 0
#define GDB_EBADMEMDATASIZE 15 // the memory data, 'XX..', is too short or too long
#define GDB_EBADBUFSIZE 21 // the buffer created is not the correct size
#define GDB_EINVALIDARG 31 // argument is invalid
#define GDB_ENOSPACE 41 //
#define GDB_EINVALIDBRKPOINTTYPE 51 // the breakpoint type is not recognized
#define GDB_EINVALIDREGNUM 61 // given register number is not valid: either <0 or >=Number of Registers
#define GDB_EUNKNOWN 255 // unknown
//
// These devices are open by GDB so we can just read and write to them
//
#define GDB_STDIN 0x00
#define GDB_STDOUT 0x01
#define GDB_STDERR 0x02
//
//Define Register size for different architectures
//
#if defined (MDE_CPU_IA32)
#define REG_SIZE 32
#elif defined (MDE_CPU_X64)
#define REG_SIZE 64
#elif defined (MDE_CPU_ARM)
#define REG_SIZE 32
#endif
typedef struct {
EFI_EXCEPTION_TYPE Exception;
UINT8 SignalNo;
} EFI_EXCEPTION_TYPE_ENTRY;
#if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
//
// Byte packed structure for DR6
// 32-bits on IA-32
// 64-bits on X64. The upper 32-bits on X64 are reserved
//
typedef union {
struct {
UINT32 B0:1; // Breakpoint condition detected
UINT32 B1:1; // Breakpoint condition detected
UINT32 B2:1; // Breakpoint condition detected
UINT32 B3:1; // Breakpoint condition detected
UINT32 Reserved_1:9; // Reserved
UINT32 BD:1; // Debug register access detected
UINT32 BS:1; // Single step
UINT32 BT:1; // Task switch
UINT32 Reserved_2:16; // Reserved
} Bits;
UINTN UintN;
} IA32_DR6;
//
// Byte packed structure for DR7
// 32-bits on IA-32
// 64-bits on X64. The upper 32-bits on X64 are reserved
//
typedef union {
struct {
UINT32 L0:1; // Local breakpoint enable
UINT32 G0:1; // Global breakpoint enable
UINT32 L1:1; // Local breakpoint enable
UINT32 G1:1; // Global breakpoint enable
UINT32 L2:1; // Local breakpoint enable
UINT32 G2:1; // Global breakpoint enable
UINT32 L3:1; // Local breakpoint enable
UINT32 G3:1; // Global breakpoint enable
UINT32 LE:1; // Local exact breakpoint enable
UINT32 GE:1; // Global exact breakpoint enable
UINT32 Reserved_1:3; // Reserved
UINT32 GD:1; // Global detect enable
UINT32 Reserved_2:2; // Reserved
UINT32 RW0:2; // Read/Write field
UINT32 LEN0:2; // Length field
UINT32 RW1:2; // Read/Write field
UINT32 LEN1:2; // Length field
UINT32 RW2:2; // Read/Write field
UINT32 LEN2:2; // Length field
UINT32 RW3:2; // Read/Write field
UINT32 LEN3:2; // Length field
} Bits;
UINTN UintN;
} IA32_DR7;
#endif /* if defined (MDE_CPU_IA32) || defined (MDE_CPU_X64) */
typedef enum {
InstructionExecution, //Hardware breakpoint
DataWrite, //watch
DataRead, //rwatch
DataReadWrite, //awatch
SoftwareBreakpoint, //Software breakpoint
NotSupported
} BREAK_TYPE;
//
// Array of exception types that need to be hooked by the debugger
//
extern EFI_EXCEPTION_TYPE_ENTRY gExceptionType[];
//
// If the periodic callback is called while we are processing an F packet we need
// to let the callback know to not read from the serail stream as it could steal
// characters from the F reponse packet
//
extern BOOLEAN gProcessingFPacket;
/**
Return the number of entries in the gExceptionType[]
@retval UINTN, the number of entries in the gExceptionType[] array.
**/
UINTN
MaxEfiException (
VOID
);
/**
Check to see if the ISA is supported.
ISA = Instruction Set Architecture
@retval TRUE if Isa is supported,
FALSE otherwise.
**/
BOOLEAN
CheckIsa (
IN EFI_INSTRUCTION_SET_ARCHITECTURE Isa
);
/**
Send the T signal with the given exception type (in gdb order) and possibly with n:r pairs related to the watchpoints
@param SystemContext Register content at time of the exception
@param GdbExceptionType GDB exception type
**/
VOID
GdbSendTSignal (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINT8 GdbExceptionType
);
/**
Translates the EFI mapping to GDB mapping
@param EFIExceptionType EFI Exception that is being processed
@retval UINTN that corresponds to EFIExceptionType's GDB exception type number
**/
UINT8
ConvertEFItoGDBtype (
IN EFI_EXCEPTION_TYPE EFIExceptionType
);
/**
Empties the given buffer
@param *Buf pointer to the first element in buffer to be emptied
**/
VOID
EmptyBuffer (
IN CHAR8 *Buf
);
/**
Converts an 8-bit Hex Char into a INTN.
@param Char - the hex character to be converted into UINTN
@retval a INTN, from 0 to 15, that corressponds to Char
-1 if Char is not a hex character
**/
INTN
HexCharToInt (
IN CHAR8 Char
);
/** 'E NN'
Send an error with the given error number after converting to hex.
The error number is put into the buffer in hex. '255' is the biggest errno we can send.
ex: 162 will be sent as A2.
@param errno the error number that will be sent
**/
VOID
EFIAPI
SendError (
IN UINT8 ErrorNum
);
/**
Send 'OK' when the function is done executing successfully.
**/
VOID
SendSuccess (
VOID
);
/**
Send empty packet to specify that particular command/functionality is not supported.
**/
VOID
SendNotSupported (
VOID
);
/** ‘p n’
Reads the n-th register's value into an output buffer and sends it as a packet
@param SystemContext Register content at time of the exception
@param InBuffer This is the input buffer received from gdb server
**/
VOID
ReadNthRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
);
/** ‘g’
Reads the general registers into an output buffer and sends it as a packet
@param SystemContext Register content at time of the exception
**/
VOID
ReadGeneralRegisters (
IN EFI_SYSTEM_CONTEXT SystemContext
);
/** ‘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 This is the input buffer received from gdb server
**/
VOID
WriteNthRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
);
/** ‘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
WriteGeneralRegisters (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *InBuffer
);
/** ‘m addr,length ’
Find the Length of the area to read and the start addres. Finally, pass them to
another function, TransferFromMemToOutBufAndSend, that will read from that memory space and
send it as a packet.
@param *PacketData Pointer to Payload data for the packet
**/
VOID
ReadFromMemory (
IN CHAR8 *PacketData
);
/** ‘M addr,length :XX...’
Find the Length of the area in bytes to write and the start addres. Finally, pass them to
another function, TransferFromInBufToMem, that will write to that memory space the info in
the input buffer.
@param PacketData Pointer to Payload data for the packet
**/
VOID
WriteToMemory (
IN CHAR8 *PacketData
);
/** ‘c [addr ]’
Continue. addr is Address to resume. If addr is omitted, resume at current
Address.
@param SystemContext Register content at time of the exception
@param *PacketData Pointer to PacketData
**/
VOID
ContinueAtAddress (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *PacketData
);
/** ‘s [addr ]’
Single step. addr is the Address at which to resume. If addr is omitted, resume
at same Address.
@param SystemContext Register content at time of the exception
@param PacketData Pointer to Payload data for the packet
**/
VOID
SingleStep (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *PacketData
);
/**
Insert Single Step in the SystemContext
@param SystemContext Register content at time of the exception
**/
VOID
AddSingleStep (
IN EFI_SYSTEM_CONTEXT SystemContext
);
/**
Remove Single Step in the SystemContext
@param SystemContext Register content at time of the exception
**/
VOID
RemoveSingleStep (
IN EFI_SYSTEM_CONTEXT SystemContext
);
/**
‘Z1, [addr], [length]’
‘Z2, [addr], [length]’
‘Z3, [addr], [length]’
‘Z4, [addr], [length]’
Insert hardware breakpoint/watchpoint at address addr of size length
@param SystemContext Register content at time of the exception
@param *PacketData Pointer to the Payload data for the packet
**/
VOID
EFIAPI
InsertBreakPoint(
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *PacketData
);
/**
‘z1, [addr], [length]’
‘z2, [addr], [length]’
‘z3, [addr], [length]’
‘z4, [addr], [length]’
Remove hardware breakpoint/watchpoint at address addr of size length
@param SystemContext Register content at time of the exception
@param *PacketData Pointer to the Payload data for the packet
**/
VOID
EFIAPI
RemoveBreakPoint(
IN EFI_SYSTEM_CONTEXT SystemContext,
IN CHAR8 *PacketData
);
/**
Exception Hanldler for GDB. It will be called for all exceptions
registered via the gExceptionType[] array.
@param ExceptionType Exception that is being processed
@param SystemContext Register content at time of the exception
**/
VOID
EFIAPI
GdbExceptionHandler (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
);
/**
Periodic callback for GDB. This function is used to catch a ctrl-c or other
break in type command from GDB.
@param SystemContext Register content at time of the call
**/
VOID
EFIAPI
GdbPeriodicCallBack (
IN OUT EFI_SYSTEM_CONTEXT SystemContext
);
/**
Make two serail consoles: 1) StdIn and StdOut via GDB. 2) StdErr via GDB.
These console show up on the remote system running GDB
**/
VOID
GdbInitializeSerialConsole (
VOID
);
/**
Send a GDB Remote Serial Protocol Packet
$PacketData#checksum PacketData is passed in and this function adds the packet prefix '$',
the packet teminating character '#' and the two digit checksum.
If an ack '+' is not sent resend the packet, but timeout eventually so we don't end up
in an infinit loop. This is so if you unplug the debugger code just keeps running
@param PacketData Payload data for the packet
@retval Number of bytes of packet data sent.
**/
UINTN
SendPacket (
IN CHAR8 *PacketData
);
/**
Receive a GDB Remote Serial Protocol Packet
$PacketData#checksum PacketData is passed in and this function adds the packet prefix '$',
the packet teminating character '#' and the two digit checksum.
If host re-starts sending a packet without ending the previous packet, only the last valid packet is processed.
(In other words, if received packet is '$12345$12345$123456#checksum', only '$123456#checksum' will be processed.)
If an ack '+' is not sent resend the packet
@param PacketData Payload data for the packet
@retval Number of bytes of packet data received.
**/
UINTN
ReceivePacket (
OUT CHAR8 *PacketData,
IN UINTN PacketDataSize
);
/**
Read data from a FileDescriptor. On success number of bytes read is returned. Zero indicates
the end of a file. On error -1 is returned. If count is zero, GdbRead returns zero.
@param FileDescriptor Device to talk to.
@param Buffer Buffer to hold Count bytes that were read
@param Count Number of bytes to transfer.
@retval -1 Error
@retval {other} Number of bytes read.
**/
INTN
GdbRead (
IN INTN FileDescriptor,
OUT VOID *Buffer,
IN UINTN Count
);
/**
Write data to a FileDescriptor. On success number of bytes written is returned. Zero indicates
nothing was written. On error -1 is returned.
@param FileDescriptor Device to talk to.
@param Buffer Buffer to hold Count bytes that are to be written
@param Count Number of bytes to transfer.
@retval -1 Error
@retval {other} Number of bytes written.
**/
INTN
GdbWrite (
IN INTN FileDescriptor,
OUT CONST VOID *Buffer,
IN UINTN Count
);
UINTN *
FindPointerToRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN RegNumber
);
CHAR8 *
BasicReadRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN RegNumber,
IN CHAR8 *OutBufPtr
);
VOID
TransferFromInBufToMem (
IN UINTN Length,
IN UINT8 *Address,
IN CHAR8 *NewData
);
VOID
TransferFromMemToOutBufAndSend (
IN UINTN Length,
IN UINT8 *Address
);
CHAR8 *
BasicWriteRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN RegNumber,
IN CHAR8 *InBufPtr
);
VOID
PrintReg (
EFI_SYSTEM_CONTEXT SystemContext
);
UINTN
ParseBreakpointPacket (
IN CHAR8 *PacketData,
OUT UINTN *Type,
OUT UINTN *Address,
OUT UINTN *Length
);
UINTN
GetBreakpointDataAddress (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN BreakpointNumber
);
UINTN
GetBreakpointDetected (
IN EFI_SYSTEM_CONTEXT SystemContext
);
BREAK_TYPE
GetBreakpointType (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN BreakpointNumber
);
UINTN
ConvertLengthData (
IN UINTN Length
);
EFI_STATUS
FindNextFreeDebugRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
OUT UINTN *Register
);
EFI_STATUS
EnableDebugRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN Register,
IN UINTN Address,
IN UINTN Length,
IN UINTN Type
);
EFI_STATUS
FindMatchingDebugRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN Address,
IN UINTN Length,
IN UINTN Type,
OUT UINTN *Register
);
EFI_STATUS
DisableDebugRegister (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINTN Register
);
VOID
InitializeProcessor (
VOID
);
/**
Send the T signal with the given exception type (in gdb order) and possibly with n:r pairs related to the watchpoints
@param SystemContext Register content at time of the exception
@param GdbExceptionType GDB exception type
**/
VOID
ProcessorSendTSignal (
IN EFI_SYSTEM_CONTEXT SystemContext,
IN UINT8 GdbExceptionType,
IN OUT CHAR8 *TSignalPtr,
IN UINTN SizeOfBuffer
);
/**
Check to see if this exception is related to ctrl-c handling.
@param ExceptionType Exception that is being processed
@param SystemContext Register content at time of the exception
@return TRUE This was a ctrl-c check that did not find a ctrl-c
@return FALSE This was not a ctrl-c check or some one hit ctrl-c
**/
BOOLEAN
ProcessorControlC (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN OUT EFI_SYSTEM_CONTEXT SystemContext
);
/**
Initialize debug agent.
This function is used to set up debug enviroment. It may enable interrupts.
@param[in] InitFlag Init flag is used to decide initialize process.
@param[in] Context Context needed according to InitFlag, it was optional.
**/
VOID
EFIAPI
DebugAgentHookExceptions (
IN UINT32 InitFlag,
IN VOID *Context OPTIONAL
);
#endif