3402aac7d9
Trailing spaces create issue/warning when generating/applying patches. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ronald Cron <ronald.cron@arm.com> Reviewed-By: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15833 6f19259b-4bc3-4df7-8a09-765794883524
816 lines
21 KiB
C
Executable File
816 lines
21 KiB
C
Executable File
/** @file
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Debug Agent library implementition with empty functions.
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Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "GdbDebugAgent.h"
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UINTN gMaxProcessorIndex = 0;
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//
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// Buffers for basic gdb communication
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//
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CHAR8 gInBuffer[MAX_BUF_SIZE];
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CHAR8 gOutBuffer[MAX_BUF_SIZE];
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//
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// Globals for returning XML from qXfer:libraries:read packet
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//
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UINTN gPacketqXferLibraryOffset = 0;
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UINTN gEfiDebugImageTableEntry = 0;
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CHAR8 gXferLibraryBuffer[2000];
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GLOBAL_REMOVE_IF_UNREFERENCED CONST CHAR8 mHexToStr[] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
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// add-symbol-file c:/work/edk2/Build/BeagleBoard/DEBUG_ARMGCC/ARM/BeagleBoardPkg/Sec/Sec/DEBUG/BeagleBoardSec.dll 0x80008360
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CHAR8 *qXferHack = "<library name=\"c:/work/edk2/Build/BeagleBoard/DEBUG_ARMGCC/ARM/BeagleBoardPkg/Sec/Sec/DEBUG/BeagleBoardSec.dll\"><segment address=\"0x80008360\"/></library>";
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UINTN
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gXferObjectReadResponse (
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IN CHAR8 Type,
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IN CHAR8 *Str
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)
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{
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CHAR8 *OutBufPtr; // pointer to the output buffer
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CHAR8 Char;
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UINTN Count;
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// responce starts with 'm' or 'l' if it is the end
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OutBufPtr = gOutBuffer;
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*OutBufPtr++ = Type;
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Count = 1;
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// Binary data encoding
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OutBufPtr = gOutBuffer;
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while (*Str != '\0') {
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Char = *Str++;
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if ((Char == 0x7d) || (Char == 0x23) || (Char == 0x24) || (Char == 0x2a)) {
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// escape character
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*OutBufPtr++ = 0x7d;
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Char ^= 0x20;
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}
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*OutBufPtr++ = Char;
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Count++;
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}
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*OutBufPtr = '\0' ; // the end of the buffer
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SendPacket (gOutBuffer);
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return Count;
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}
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/**
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Process "qXfer:object:read:annex:offset,length" request.
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Returns an XML document that contains loaded libraries. In our case it is
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infomration in the EFI Debug Inmage Table converted into an XML document.
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GDB will call with an arbitrary length (it can't know the real length and
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will reply with chunks of XML that are easy for us to deal with. Gdb will
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keep calling until we say we are done. XML doc looks like:
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<library-list>
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<library name="/a/a/c/d.dSYM"><segment address="0x10000000"/></library>
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<library name="/a/m/e/e.pdb"><segment address="0x20000000"/></library>
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<library name="/a/l/f/f.dll"><segment address="0x30000000"/></library>
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</library-list>
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Since we can not allocate memory in interupt context this module has
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assumptions about how it will get called:
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1) Length will generally be max remote packet size (big enough)
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2) First Offset of an XML document read needs to be 0
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3) This code will return back small chunks of the XML document on every read.
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Each subseqent call will ask for the next availble part of the document.
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Note: The only variable size element in the XML is:
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" <library name=\"%s\"><segment address=\"%p\"/></library>\n" and it is
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based on the file path and name of the symbol file. If the symbol file name
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is bigger than the max gdb remote packet size we could update this code
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to respond back in chunks.
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@param Offset offset into special data area
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@param Length number of bytes to read starting at Offset
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**/
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VOID
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QxferLibrary (
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IN UINTN Offset,
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IN UINTN Length
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)
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{
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gPacketqXferLibraryOffset += gXferObjectReadResponse ('m', "<library-list>\n");
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gPacketqXferLibraryOffset += gXferObjectReadResponse ('m', qXferHack);
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gXferObjectReadResponse ('l', "</library-list>\n");
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gPacketqXferLibraryOffset = 0;
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}
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/**
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Transfer length bytes of input buffer, starting at Address, to memory.
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@param length the number of the bytes to be transferred/written
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@param *address the start address of the transferring/writing the memory
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@param *new_data the new data to be written to memory
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**/
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VOID
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TransferFromInBufToMem (
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IN UINTN Length,
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IN unsigned char *Address,
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IN CHAR8 *NewData
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)
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{
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CHAR8 c1;
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CHAR8 c2;
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while (Length-- > 0) {
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c1 = (CHAR8)HexCharToInt (*NewData++);
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c2 = (CHAR8)HexCharToInt (*NewData++);
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if ((c1 < 0) || (c2 < 0)) {
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SendError (GDB_EBADMEMDATA);
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return;
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}
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*Address++ = (UINT8)((c1 << 4) + c2);
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}
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SendSuccess();
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}
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/**
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Transfer Length bytes of memory starting at Address to an output buffer, OutBuffer. This function will finally send the buffer
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as a packet.
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@param Length the number of the bytes to be transferred/read
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@param *address pointer to the start address of the transferring/reading the memory
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**/
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VOID
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TransferFromMemToOutBufAndSend (
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IN UINTN Length,
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IN unsigned char *Address
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)
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{
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// there are Length bytes and every byte is represented as 2 hex chars
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CHAR8 OutBuffer[MAX_BUF_SIZE];
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CHAR8 *OutBufPtr; // pointer to the output buffer
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CHAR8 Char;
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OutBufPtr = OutBuffer;
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while (Length > 0) {
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Char = mHexToStr[*Address >> 4];
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if ((Char >= 'A') && (Char <= 'F')) {
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Char = Char - 'A' + 'a';
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}
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*OutBufPtr++ = Char;
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Char = mHexToStr[*Address & 0x0f];
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if ((Char >= 'A') && (Char <= 'F')) {
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Char = Char - 'A' + 'a';
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}
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*OutBufPtr++ = Char;
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Address++;
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Length--;
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}
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*OutBufPtr = '\0' ; // the end of the buffer
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SendPacket (OutBuffer);
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}
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/**
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Send a GDB Remote Serial Protocol Packet
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$PacketData#checksum PacketData is passed in and this function adds the packet prefix '$',
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the packet teminating character '#' and the two digit checksum.
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If an ack '+' is not sent resend the packet, but timeout eventually so we don't end up
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in an infinit loop. This is so if you unplug the debugger code just keeps running
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@param PacketData Payload data for the packet
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@retval Number of bytes of packet data sent.
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**/
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UINTN
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SendPacket (
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IN CHAR8 *PacketData
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)
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{
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UINT8 CheckSum;
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UINTN Timeout;
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CHAR8 *Ptr;
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CHAR8 TestChar;
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UINTN Count;
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Timeout = PcdGet32 (PcdGdbMaxPacketRetryCount);
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Count = 0;
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do {
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Ptr = PacketData;
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if (Timeout-- == 0) {
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// Only try a finite number of times so we don't get stuck in the loop
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return Count;
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}
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// Packet prefix
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GdbPutChar ('$');
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for (CheckSum = 0, Count =0 ; *Ptr != '\0'; Ptr++, Count++) {
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GdbPutChar (*Ptr);
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CheckSum = CheckSum + *Ptr;
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}
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// Packet terminating character and checksum
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GdbPutChar ('#');
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GdbPutChar (mHexToStr[CheckSum >> 4]);
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GdbPutChar (mHexToStr[CheckSum & 0x0F]);
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TestChar = GdbGetChar ();
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} while (TestChar != '+');
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return Count;
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}
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/**
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Receive a GDB Remote Serial Protocol Packet
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$PacketData#checksum PacketData is passed in and this function adds the packet prefix '$',
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the packet teminating character '#' and the two digit checksum.
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If host re-starts sending a packet without ending the previous packet, only the last valid packet is proccessed.
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(In other words, if received packet is '$12345$12345$123456#checksum', only '$123456#checksum' will be processed.)
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If an ack '+' is not sent resend the packet
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@param PacketData Payload data for the packet
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@retval Number of bytes of packet data received.
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**/
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UINTN
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ReceivePacket (
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OUT CHAR8 *PacketData,
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IN UINTN PacketDataSize
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)
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{
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UINT8 CheckSum;
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UINTN Index;
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CHAR8 Char;
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CHAR8 SumString[3];
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CHAR8 TestChar;
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ZeroMem (PacketData, PacketDataSize);
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for (;;) {
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// wait for the start of a packet
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TestChar = GdbGetChar ();
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while (TestChar != '$') {
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TestChar = GdbGetChar ();
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};
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retry:
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for (Index = 0, CheckSum = 0; Index < (PacketDataSize - 1); Index++) {
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Char = GdbGetChar ();
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if (Char == '$') {
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goto retry;
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}
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if (Char == '#') {
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break;
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}
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PacketData[Index] = Char;
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CheckSum = CheckSum + Char;
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}
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PacketData[Index] = '\0';
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if (Index == PacketDataSize) {
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continue;
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}
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SumString[0] = GdbGetChar ();
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SumString[1] = GdbGetChar ();
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SumString[2] = '\0';
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if (AsciiStrHexToUintn (SumString) == CheckSum) {
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// Ack: Success
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GdbPutChar ('+');
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// Null terminate the callers string
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PacketData[Index] = '\0';
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return Index;
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} else {
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// Ack: Failure
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GdbPutChar ('-');
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}
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}
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//return 0;
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}
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/**
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Empties the given buffer
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@param Buf pointer to the first element in buffer to be emptied
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**/
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VOID
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EmptyBuffer (
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IN CHAR8 *Buf
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)
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{
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*Buf = '\0';
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}
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/**
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Converts an 8-bit Hex Char into a INTN.
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@param Char the hex character to be converted into UINTN
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@retval a INTN, from 0 to 15, that corressponds to Char
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-1 if Char is not a hex character
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**/
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INTN
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HexCharToInt (
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IN CHAR8 Char
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)
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{
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if ((Char >= 'A') && (Char <= 'F')) {
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return Char - 'A' + 10;
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} else if ((Char >= 'a') && (Char <= 'f')) {
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return Char - 'a' + 10;
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} else if ((Char >= '0') && (Char <= '9')) {
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return Char - '0';
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} else { // if not a hex value, return a negative value
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return -1;
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}
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}
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// 'E' + the biggest error number is 255, so its 2 hex digits + buffer end
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CHAR8 *gError = "E__";
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/** 'E NN'
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Send an error with the given error number after converting to hex.
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The error number is put into the buffer in hex. '255' is the biggest errno we can send.
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ex: 162 will be sent as A2.
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@param errno the error number that will be sent
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**/
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VOID
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EFIAPI
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SendError (
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IN UINT8 ErrorNum
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)
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{
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//
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// Replace _, or old data, with current errno
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//
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gError[1] = mHexToStr [ErrorNum >> 4];
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gError[2] = mHexToStr [ErrorNum & 0x0f];
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SendPacket (gError); // send buffer
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}
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/**
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Send 'OK' when the function is done executing successfully.
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**/
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VOID
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EFIAPI
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SendSuccess (
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VOID
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)
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{
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SendPacket ("OK"); // send buffer
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}
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/**
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Send empty packet to specify that particular command/functionality is not supported.
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**/
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VOID
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EFIAPI
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SendNotSupported (
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VOID
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)
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{
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SendPacket ("");
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}
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/**
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Translates the EFI mapping to GDB mapping
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@param EFIExceptionType EFI Exception that is being processed
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@retval UINTN that corresponds to EFIExceptionType's GDB exception type number
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**/
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UINT8
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ConvertEFItoGDBtype (
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IN EFI_EXCEPTION_TYPE EFIExceptionType
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)
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{
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UINTN i;
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for (i=0; i < MaxEfiException() ; i++) {
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if (gExceptionType[i].Exception == EFIExceptionType) {
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return gExceptionType[i].SignalNo;
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}
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}
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return GDB_SIGTRAP; // this is a GDB trap
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}
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/** "m addr,length"
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Find the Length of the area to read and the start addres. Finally, pass them to
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another function, TransferFromMemToOutBufAndSend, that will read from that memory space and
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send it as a packet.
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**/
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VOID
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EFIAPI
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ReadFromMemory (
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CHAR8 *PacketData
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)
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{
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UINTN Address;
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UINTN Length;
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CHAR8 AddressBuffer[MAX_ADDR_SIZE]; // the buffer that will hold the address in hex chars
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CHAR8 *AddrBufPtr; // pointer to the address buffer
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CHAR8 *InBufPtr; /// pointer to the input buffer
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AddrBufPtr = AddressBuffer;
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InBufPtr = &PacketData[1];
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while (*InBufPtr != ',') {
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*AddrBufPtr++ = *InBufPtr++;
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}
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*AddrBufPtr = '\0';
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InBufPtr++; // this skips ',' in the buffer
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/* Error checking */
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if (AsciiStrLen(AddressBuffer) >= MAX_ADDR_SIZE) {
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SendError (GDB_EBADMEMADDRBUFSIZE);
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return;
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}
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// 2 = 'm' + ','
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if (AsciiStrLen(PacketData) - AsciiStrLen(AddressBuffer) - 2 >= MAX_LENGTH_SIZE) {
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SendError (GDB_EBADMEMLENGTH);
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return;
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}
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Address = AsciiStrHexToUintn (AddressBuffer);
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Length = AsciiStrHexToUintn (InBufPtr);
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TransferFromMemToOutBufAndSend (Length, (unsigned char *)Address);
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}
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/** "M addr,length :XX..."
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Find the Length of the area in bytes to write and the start addres. Finally, pass them to
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another function, TransferFromInBufToMem, that will write to that memory space the info in
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the input buffer.
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**/
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VOID
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EFIAPI
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WriteToMemory (
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IN CHAR8 *PacketData
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)
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{
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UINTN Address;
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UINTN Length;
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UINTN MessageLength;
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CHAR8 AddressBuffer[MAX_ADDR_SIZE]; // the buffer that will hold the Address in hex chars
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CHAR8 LengthBuffer[MAX_LENGTH_SIZE]; // the buffer that will hold the Length in hex chars
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CHAR8 *AddrBufPtr; // pointer to the Address buffer
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CHAR8 *LengthBufPtr; // pointer to the Length buffer
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CHAR8 *InBufPtr; /// pointer to the input buffer
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AddrBufPtr = AddressBuffer;
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LengthBufPtr = LengthBuffer;
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InBufPtr = &PacketData[1];
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while (*InBufPtr != ',') {
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*AddrBufPtr++ = *InBufPtr++;
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}
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*AddrBufPtr = '\0';
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InBufPtr++; // this skips ',' in the buffer
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while (*InBufPtr != ':') {
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*LengthBufPtr++ = *InBufPtr++;
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}
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*LengthBufPtr = '\0';
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InBufPtr++; // this skips ':' in the buffer
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Address = AsciiStrHexToUintn (AddressBuffer);
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Length = AsciiStrHexToUintn (LengthBuffer);
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/* Error checking */
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//Check if Address is not too long.
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if (AsciiStrLen(AddressBuffer) >= MAX_ADDR_SIZE) {
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SendError (GDB_EBADMEMADDRBUFSIZE);
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return;
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}
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//Check if message length is not too long
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if (AsciiStrLen(LengthBuffer) >= MAX_LENGTH_SIZE) {
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SendError (GDB_EBADMEMLENGBUFSIZE);
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return;
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}
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// Check if Message is not too long/short.
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// 3 = 'M' + ',' + ':'
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MessageLength = (AsciiStrLen(PacketData) - AsciiStrLen(AddressBuffer) - AsciiStrLen(LengthBuffer) - 3);
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if (MessageLength != (2*Length)) {
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//Message too long/short. New data is not the right size.
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SendError (GDB_EBADMEMDATASIZE);
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return;
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}
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TransferFromInBufToMem (Length, (unsigned char *)Address, InBufPtr);
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}
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/**
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Parses breakpoint packet data and captures Breakpoint type, Address and length.
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In case of an error, function returns particular error code. Returning 0 meaning
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no error.
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@param PacketData Pointer to the payload data for the packet.
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@param Type Breakpoint type
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@param Address Breakpoint address
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@param Length Breakpoint length in Bytes (1 byte, 2 byte, 4 byte)
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|
||
@retval 1 Success
|
||
@retval {other} Particular error code
|
||
|
||
**/
|
||
UINTN
|
||
ParseBreakpointPacket (
|
||
IN CHAR8 *PacketData,
|
||
OUT UINTN *Type,
|
||
OUT UINTN *Address,
|
||
OUT UINTN *Length
|
||
)
|
||
{
|
||
CHAR8 AddressBuffer[MAX_ADDR_SIZE];
|
||
CHAR8 *AddressBufferPtr;
|
||
CHAR8 *PacketDataPtr;
|
||
|
||
PacketDataPtr = &PacketData[1];
|
||
AddressBufferPtr = AddressBuffer;
|
||
|
||
*Type = AsciiStrHexToUintn (PacketDataPtr);
|
||
|
||
//Breakpoint/watchpoint type should be between 0 to 4
|
||
if (*Type > 4) {
|
||
return 22; //EINVAL: Invalid argument.
|
||
}
|
||
|
||
//Skip ',' in the buffer.
|
||
while (*PacketDataPtr++ != ',');
|
||
|
||
//Parse Address information
|
||
while (*PacketDataPtr != ',') {
|
||
*AddressBufferPtr++ = *PacketDataPtr++;
|
||
}
|
||
*AddressBufferPtr = '\0';
|
||
|
||
//Check if Address is not too long.
|
||
if (AsciiStrLen(AddressBuffer) >= MAX_ADDR_SIZE) {
|
||
return 40; //EMSGSIZE: Message size too long.
|
||
}
|
||
|
||
*Address = AsciiStrHexToUintn (AddressBuffer);
|
||
|
||
PacketDataPtr++; //This skips , in the buffer
|
||
|
||
//Parse Length information
|
||
*Length = AsciiStrHexToUintn (PacketDataPtr);
|
||
|
||
//Length should be 1, 2 or 4 bytes
|
||
if (*Length > 4) {
|
||
return 22; //EINVAL: Invalid argument
|
||
}
|
||
|
||
return 0; //0 = No error
|
||
}
|
||
|
||
|
||
|
||
/**
|
||
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
|
||
)
|
||
{
|
||
CHAR8 TSignalBuffer[128];
|
||
CHAR8 *TSignalPtr;
|
||
|
||
TSignalPtr = &TSignalBuffer[0];
|
||
|
||
//Construct TSignal packet
|
||
*TSignalPtr++ = 'T';
|
||
|
||
//
|
||
// replace _, or previous value, with Exception type
|
||
//
|
||
*TSignalPtr++ = mHexToStr [GdbExceptionType >> 4];
|
||
*TSignalPtr++ = mHexToStr [GdbExceptionType & 0x0f];
|
||
|
||
ProcessorSendTSignal (SystemContext, GdbExceptionType, TSignalPtr, sizeof (TSignalBuffer) - 2);
|
||
|
||
SendPacket (TSignalBuffer);
|
||
}
|
||
|
||
VOID
|
||
GdbFWrite (
|
||
IN UINTN Fd,
|
||
IN CHAR8 *Data,
|
||
IN UINTN DataSize
|
||
)
|
||
{
|
||
CHAR8 Buffer[128];
|
||
|
||
AsciiSPrint (Buffer, sizeof (Buffer), "Fwrite,%x,%x,%x", Fd, Data, DataSize);
|
||
SendPacket (Buffer);
|
||
|
||
for( ; ; ) {
|
||
ReceivePacket (gInBuffer, MAX_BUF_SIZE);
|
||
|
||
switch (gInBuffer[0]) {
|
||
case 'm':
|
||
ReadFromMemory (gInBuffer);
|
||
break;
|
||
|
||
case 'M':
|
||
WriteToMemory (gInBuffer);
|
||
break;
|
||
|
||
case 'F':
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
VOID
|
||
GdbFPutString (
|
||
IN CHAR8 *String
|
||
)
|
||
{
|
||
UINTN Len = AsciiStrSize (String);
|
||
|
||
GdbFWrite (2, String, Len);
|
||
}
|
||
|
||
|
||
/**
|
||
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
|
||
)
|
||
{
|
||
UINT8 GdbExceptionType;
|
||
CHAR8 *Ptr;
|
||
|
||
if (ProcessorControlC (ExceptionType, SystemContext)) {
|
||
// We tried to process a control C handler and there is nothing to do
|
||
return;
|
||
}
|
||
|
||
GdbExceptionType = ConvertEFItoGDBtype (ExceptionType);
|
||
GdbSendTSignal (SystemContext, GdbExceptionType);
|
||
|
||
for( ; ; ) {
|
||
ReceivePacket (gInBuffer, MAX_BUF_SIZE);
|
||
|
||
switch (gInBuffer[0]) {
|
||
case '?':
|
||
GdbSendTSignal (SystemContext, GdbExceptionType);
|
||
break;
|
||
|
||
case 'c':
|
||
ContinueAtAddress (SystemContext, gInBuffer);
|
||
return;
|
||
|
||
case 'D':
|
||
// gdb wants to disconnect so return "OK" packet since.
|
||
SendSuccess ();
|
||
return;
|
||
|
||
case 'g':
|
||
ReadGeneralRegisters (SystemContext);
|
||
break;
|
||
|
||
case 'G':
|
||
WriteGeneralRegisters (SystemContext, gInBuffer);
|
||
break;
|
||
|
||
case 'H':
|
||
//Return "OK" packet since we don't have more than one thread.
|
||
SendSuccess ();
|
||
break;
|
||
|
||
case 'm':
|
||
ReadFromMemory (gInBuffer);
|
||
break;
|
||
|
||
case 'M':
|
||
WriteToMemory (gInBuffer);
|
||
break;
|
||
|
||
case 'P':
|
||
WriteNthRegister (SystemContext, gInBuffer);
|
||
break;
|
||
|
||
//
|
||
// Still debugging this code. Not used in Darwin
|
||
//
|
||
case 'q':
|
||
// General Query Packets
|
||
if (AsciiStrnCmp (gInBuffer, "qSupported", 10) == 0) {
|
||
// return what we currently support, we don't parse what gdb suports
|
||
AsciiSPrint (gOutBuffer, MAX_BUF_SIZE, "qXfer:libraries:read+;PacketSize=%d", MAX_BUF_SIZE);
|
||
SendPacket (gOutBuffer);
|
||
} else if (AsciiStrnCmp (gInBuffer, "qXfer:libraries:read::", 22) == 0) {
|
||
// <20>qXfer:libraries:read::offset,length
|
||
// gInBuffer[22] is offset string, ++Ptr is length string<6E>
|
||
for (Ptr = &gInBuffer[22]; *Ptr != ','; Ptr++);
|
||
|
||
// Not sure if multi-radix support is required. Currently only support decimal
|
||
QxferLibrary (AsciiStrHexToUintn (&gInBuffer[22]), AsciiStrHexToUintn (++Ptr));
|
||
} else if (AsciiStrnCmp (gInBuffer, "qOffsets", 8) == 0) {
|
||
AsciiSPrint (gOutBuffer, MAX_BUF_SIZE, "Text=1000;Data=f000;Bss=f000");
|
||
SendPacket (gOutBuffer);
|
||
} else if (AsciiStrnCmp (gInBuffer, "qAttached", 9) == 0) {
|
||
// remote server attached to an existing process
|
||
SendPacket ("1");
|
||
} else {
|
||
//Send empty packet
|
||
SendNotSupported ();
|
||
}
|
||
break;
|
||
|
||
case 's':
|
||
SingleStep (SystemContext, gInBuffer);
|
||
return;
|
||
|
||
case 'z':
|
||
RemoveBreakPoint (SystemContext, gInBuffer);
|
||
break;
|
||
|
||
case 'Z':
|
||
InsertBreakPoint (SystemContext, gInBuffer);
|
||
break;
|
||
|
||
default:
|
||
//Send empty packet
|
||
SendNotSupported ();
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
|
||
|
||
|