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Date: Mon, 4 Aug 2008 00:31:06 -0600 (MDT)
From: jmerkey@...fmountaingroup.com
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.27-rc1 6/25] mdb: Merkey's Kernel Debugger 2.6.27-rc1
Netware style debugger for Linux written by Jeffrey Vernon Merkey
--- a/debug/mdb.c 1969-12-31 17:00:00.000000000 -0700
+++ b/debug/mdb.c 2008-08-03 16:15:00.000000000 -0600
@@ -0,0 +1,496 @@
+
+/***************************************************************************
+*
+* Copyright (c) 1997, 2008 Jeff V. Merkey All Rights Reserved.
+* 1058 East 50 South
+* Lindon, Utah 84042
+* jmerkey@...fmountaingroup.com
+*
+* This program is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License as published by the
+* Free Software Foundation, version 2, or any later version.
+*
+* This program is distributed in the hope that it will be useful, but
+* WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+* General Public License for more details.
+*
+* You are free to modify and re-distribute this program in accordance
+* with the terms specified in the GNU Public License. The copyright
+* contained in this code is required to be present in any derivative
+* works and you are required to provide the source code for this
+* program as part of any commercial or non-commercial distribution.
+* You are required to respect the rights of the Copyright holders
+* named within this code.
+*
+* jmerkey@...h-nac.org is the official maintainer of
+* this code. You are encouraged to report any bugs, problems, fixes,
+* suggestions, and comments about this software to jmerkey@...h-nac.org
+* or linux-kernel@...r.kernel.org. New releases, patches, bug fixes, and
+* technical documentation can be found at www.kernel.org. I will
+* periodically post new releases of this software to www.kernel.org
+* that contain bug fixes and enhanced capabilities.
+*
+*
+* AUTHOR : Jeff V. Merkey
+* FILE : MDB.C
+* DESCRIP : Merkey's NetWare Debugger
+* DATE : December 20, 2001
+*
+***************************************************************************/
+
+#include "mdb.h"
+
+#ifdef CONFIG_MDB
+
+extern void MDBInitializeDebugger(void);
+extern void MDBClearDebuggerState(void);
+
+ULONG TotalSystemMemory = 0;
+ULONG HistoryPointer = 0;
+BYTE HistoryBuffer[16][256]; // remember last 32 non-repeating commands
+BYTE delim_table[256];
+void set_delimiter(BYTE c) { delim_table[c & 0xFF] = TRUE; }
+
+void SaveLastCommandInfo(ULONG processor)
+{
+ register int i;
+
+ repeatCommand = 0;
+ lastCommand = toupper(debugCommand[0]);
+ lastDisplayLength = displayLength;
+ ProcessorMode[processor] = 0;
+
+ for (i=0; (i < 80) && (debugCommand[i]); i++)
+ {
+ if ((debugCommand[i] == '\n') || (debugCommand[i] == '\r'))
+ lastDebugCommand[i] = '\0';
+ else
+ lastDebugCommand[i] = debugCommand[i];
+ }
+ lastDebugCommand[i] = '\0';
+
+ return;
+}
+
+StackFrame CurrentStackFrame[MAX_PROCESSORS];
+
+atomic_t inmdb = { 0 };
+BYTE *mdb_oops = NULL;
+BYTE *last_mdb_oops = NULL;
+
+int mdb(int reason, int error, void *frame)
+{
+ register ULONG retCode = 0, processor = get_processor_id();
+ extern void ReadStackFrame(void *, StackFrame *, ULONG);
+ extern void WriteStackFrame(void *, StackFrame *, ULONG);
+ unsigned long state;
+#ifdef CONFIG_MDB_CONSOLE_REDIRECTION
+ extern int kmsg_redirect;
+ int kmsg_redirect_save;
+#endif
+
+ preempt_disable();
+#ifdef CONFIG_MDB_CONSOLE_REDIRECTION
+ kmsg_redirect_save = kmsg_redirect;
+ kmsg_redirect = 0;
+#endif
+
+ last_mdb_oops = NULL;
+ if (mdb_oops)
+ {
+ last_mdb_oops = mdb_oops;
+ mdb_oops = NULL;
+ }
+ atomic_inc(&inmdb);
+ state = save_flags();
+ memset(&CurrentStackFrame[processor], 0, sizeof(StackFrame));
+ ReadStackFrame(frame, &CurrentStackFrame[processor], processor);
+ CurrentStackFrame[processor].tReserved[2] = (ULONG)frame;
+ retCode = debugger_entry(reason, &CurrentStackFrame[processor],
+ processor);
+ WriteStackFrame(frame, &CurrentStackFrame[processor], processor);
+
+ restore_flags(state);
+ atomic_dec(&inmdb);
+
+#ifdef CONFIG_MDB_CONSOLE_REDIRECTION
+ kmsg_redirect = kmsg_redirect_save;
+#endif
+ preempt_enable();
+
+ return retCode;
+}
+
+int mdb_close(void) { MDBClearDebuggerState(); return 0; }
+
+ALT_DEBUGGER MDBDebugger = { NULL, NULL, NULL };
+
+int mdb_init(void)
+{
+ register int i;
+
+ MDBInitializeDebugger();
+ MDBDebugger.AlternateDebugger = mdb;
+ AddAlternateDebugger(&MDBDebugger);
+
+ // initialize delimiter lookup table
+ for (i=0; i < 256; i++)
+ delim_table[i] = '\0';
+
+ set_delimiter('\0');
+ set_delimiter('\n');
+ set_delimiter('\r');
+ set_delimiter('[');
+ set_delimiter(']');
+ set_delimiter('<');
+ set_delimiter('>');
+ set_delimiter('(');
+ set_delimiter(')');
+ set_delimiter('|');
+ set_delimiter('&');
+ set_delimiter('=');
+ set_delimiter('*');
+ set_delimiter('+');
+ set_delimiter('-');
+ set_delimiter('/');
+ set_delimiter('%');
+ set_delimiter('~');
+ set_delimiter('^');
+ set_delimiter('!');
+ set_delimiter(' ');
+
+ return 0;
+}
+
+ULONG ScreenInputFromKeyboard(BYTE *buf, ULONG buf_index, ULONG max_index)
+{
+ register ULONG key;
+ register BYTE *p;
+ register int i, r, temp;
+ register ULONG orig_index, HistoryIndex;
+ extern ULONG IsAccelerator(ULONG);
+
+ if (buf_index > max_index)
+ return 0;
+
+ if (!max_index)
+ return 0;
+
+ orig_index = buf_index;
+
+ p = (BYTE *)((ULONG)buf + (ULONG)buf_index);
+ for (i=0; i < (max_index - buf_index); i++)
+ *p++ = '\0';
+
+ HistoryIndex = HistoryPointer;
+ while (1)
+ {
+ key = mdb_getkey();
+
+ if ((IsAccelerator(key)) && (key != 13))
+ return key;
+
+ switch (key)
+ {
+ case 8: // backspace
+ if (buf_index)
+ {
+ register int delta;
+
+ buf_index--;
+ DBGPrint("\b \b");
+
+// if (!buf[buf_index + 1])
+// buf[buf_index] = '\0';
+// else
+// buf[buf_index] = ' ';
+
+ delta = strlen(buf) - buf_index;
+
+ for (i=0; i < delta; i++)
+ DBGPrint(" ");
+
+ for (i=0; i < delta; i++)
+ DBGPrint("\b");
+
+ p = (BYTE *) &buf[buf_index];
+ temp = buf_index;
+ p++;
+ while ((*p) && (temp < max_index))
+ buf[temp++] = *p++;
+ buf[temp] = '\0';
+
+ delta = strlen(buf) - buf_index;
+
+ for (i=0; (i < delta) && (buf[i]); i++)
+ DBGPrint("%c", buf[buf_index + i]);
+
+ for (i=0; i < delta; i++)
+ DBGPrint("\b");
+ }
+ break;
+
+ case K_P7: // home
+ {
+ BYTE s[256];
+
+ for (i=0; (i < buf_index) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ buf_index = orig_index;
+ }
+ break;
+
+ case K_P1: // end
+ {
+ BYTE s[256];
+
+ for (i=0; (i < buf_index) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ for (i=0; (i < strlen(buf)) && (i < 255); i++)
+ DBGPrint("%c", buf[i]);
+
+ buf_index = strlen(buf);
+
+ }
+ break;
+
+ case K_P4: // left arrow
+ if (buf_index)
+ {
+ buf_index--;
+ DBGPrint("\b");
+ }
+ break;
+
+ case K_P6: // right arrow
+ if (buf_index < strlen(buf))
+ {
+ DBGPrint("%c", buf[buf_index]);
+ buf_index++;
+ }
+ break;
+
+ case K_PDOT:
+ {
+ register int delta;
+
+ delta = strlen(buf) - buf_index;
+
+ for (i=0; i < delta; i++)
+ DBGPrint(" ");
+
+ for (i=0; i < delta; i++)
+ DBGPrint("\b");
+
+ p = (BYTE *) &buf[buf_index];
+ temp = buf_index;
+ p++;
+ while ((*p) && (temp < max_index))
+ buf[temp++] = *p++;
+ buf[temp] = '\0';
+
+ delta = strlen(buf) - buf_index;
+
+ for (i=0; (i < delta) && (buf[i]); i++)
+ DBGPrint("%c", buf[buf_index + i]);
+
+ for (i=0; i < delta; i++)
+ DBGPrint("\b");
+ }
+ break;
+
+ case 13: // enter
+ if (strncmp(HistoryBuffer[(HistoryPointer - 1) & 0xF], buf,
+ strlen(buf)) || (strlen(buf) !=
+ strlen(HistoryBuffer[(HistoryPointer - 1) & 0xF])))
+ {
+ for (r=0; r < max_index; r++)
+ {
+ if (buf[0])
+ HistoryBuffer[HistoryPointer & 0xF][r] = buf[r];
+ }
+ if (buf[0])
+ HistoryPointer++;
+ }
+ return 13;
+
+ case K_P8: // up arrow
+ if (HistoryBuffer[(HistoryIndex - 1) & 0xF][0])
+ {
+ BYTE s[256];
+
+ for (i=0; (i < buf_index) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ for (i=0; (i < strlen(buf)) && (i < 255); i++)
+ s[i] = ' ';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ for (i=0; (i < strlen(buf)) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ HistoryIndex--;
+
+ for (r=0; r < max_index; r++)
+ buf[r] = HistoryBuffer[HistoryIndex & 0xF][r];
+ buf_index = strlen(buf);
+
+ DBGPrint("%s", buf);
+ }
+ break;
+
+ case K_P2: // down arrow
+ if (HistoryBuffer[HistoryIndex & 0xF][0])
+ {
+ BYTE s[256];
+
+ for (i=0; (i < buf_index) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ for (i=0; (i < strlen(buf)) && (i < 255); i++)
+ s[i] = ' ';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ for (i=0; (i < strlen(buf)) && (i < 255); i++)
+ s[i] = '\b';
+ s[i] = '\0';
+ DBGPrint("%s", s);
+
+ HistoryIndex++;
+
+ for (r=0; r < max_index; r++)
+ buf[r] = HistoryBuffer[HistoryIndex & 0xF][r];
+ buf_index = strlen(buf);
+
+ DBGPrint("%s", buf);
+ }
+ break;
+
+ default:
+ if ((key > 0x7E) || (key < ' ')) // if above or below text
+ break;
+ else
+ {
+ if (strlen(buf) < max_index)
+ {
+ register int delta;
+
+ for (i=max_index; i > buf_index; i--)
+ buf[i] = buf[i-1];
+ buf[buf_index] = (BYTE)key;
+ if (buf_index < max_index)
+ buf_index++;
+
+ delta = strlen(buf) - buf_index;
+
+ for (i=0; (i < delta) && (buf[i]); i++)
+ DBGPrint("%c", buf[buf_index + i]);
+
+ for (i=0; i < delta; i++)
+ DBGPrint("\b");
+ }
+ }
+ break;
+ }
+ }
+}
+
+ULONG debugger_command_entry(ULONG processor, ULONG Exception,
+ StackFrame *stackFrame)
+{
+ BYTE verbBuffer[100];
+ register BYTE *verb, *pp, *vp;
+ register ULONG count, retCode, key;
+ extern ULONG reason_toggle;
+ extern void displayRegisters(StackFrame *, ULONG);
+
+ if (Exception > 22)
+ Exception = 20;
+
+ lastUnasmAddress = (ULONG) GetIP(stackFrame);
+ lastLinkAddress = lastDumpAddress = (BYTE *)
GetStackAddress(stackFrame);
+ lastDisplayLength = displayLength = 20;
+ lastCommandEntry = lastCommand;
+
+ if (reason_toggle)
+ {
+ if (!ConsoleDisplayBreakReason(stackFrame, Exception, processor,
+ lastCommand))
+ return 0;
+ }
+ displayRegisters(stackFrame, processor);
+ nextUnasmAddress = disassemble(stackFrame, lastUnasmAddress, 1, 1);
+ ClearTempBreakpoints();
+
+ while (1)
+ {
+ extern int nextline;
+
+ nextline = 0;
+
+ DBGPrint("(%i)> ", (int)processor);
+
+ SaveLastCommandInfo(processor);
+
+ key = ScreenInputFromKeyboard((BYTE *)&debugCommand[0], 0, 80);
+ if (key)
+ {
+ extern ULONG AccelRoutine(ULONG key, void *p);
+
+ retCode = AccelRoutine(key, stackFrame);
+ switch (retCode)
+ {
+ case 0:
+ break;
+
+ case -1:
+ return retCode;
+
+ default:
+ DBGPrint("\n");
+ continue;
+ }
+ }
+
+ if (*debugCommand)
+ {
+ count = 0;
+ pp = (BYTE *)debugCommand;
+ vp = verb = &verbBuffer[0];
+ while (*pp && *pp == ' ' && count++ < 80)
+ pp++;
+
+ while (*pp && *pp != ' ' && *pp != '=' && count++ < 80)
+ *vp++ = *pp++;
+ *vp = '\0';
+
+ while (*pp && *pp == ' ' && count++ < 80)
+ pp++;
+
+ retCode = DebuggerParserRoutine(verb, (BYTE *)debugCommand,
+ stackFrame, Exception);
+ switch (retCode)
+ {
+ case -1:
+ return retCode;
+ }
+ }
+ }
+}
+
+#endif
By making a contribution to this project, I certify that
the contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file.
Jeffrey Vernon Merkey
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