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Message-Id: <200808210250.m7L2oan4028337@wolfmountaingroup.com>
Date: Wed, 20 Aug 2008 20:50:36 -0600
From: jmerkey@...fmountaingroup.com
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.27-rc4 15/27] mdb: add mdb-main.c linux debugger entry functions
add mdb-main.c linux debugger entry functions
add MAGIC_SYSRQ keyboard support. add support for panic notify_die
callback.
Signed-off-by: Jeffrey Vernon Merkey (jmerkey@...fmountaingroup.com)
--- a/debug/mdb/mdb-main.c 1969-12-31 17:00:00.000000000 -0700
+++ b/debug/mdb/mdb-main.c 2008-08-19 21:33:27.000000000 -0600
@@ -0,0 +1,694 @@
+
+/***************************************************************************
+*
+* Copyright (c) 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.
+*
+* 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@...fmountaingroup.com is the official maintainer of
+* this code. You are encouraged to report any bugs, problems, fixes,
+* suggestions, and comments about this software.
+*
+* AUTHOR : Jeff V. Merkey
+* DESCRIP : Merkey's Linux Debugger
+*
+***************************************************************************/
+
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/mm.h>
+#include <linux/cdrom.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/ctype.h>
+#include <linux/keyboard.h>
+#include <linux/console.h>
+#include <linux/serial_reg.h>
+#include <linux/uaccess.h>
+#include <asm/system.h>
+#include <asm/segment.h>
+#include <asm/atomic.h>
+#include <asm/msr.h>
+#include <linux/io.h>
+#include <linux/kdebug.h>
+#include <linux/notifier.h>
+#include <linux/sysrq.h>
+#include <linux/input.h>
+
+#ifdef CONFIG_SMP
+#include <mach_apic.h>
+#include <mach_ipi.h>
+#endif
+
+#define __KERNEL_SYSCALLS__
+#include <linux/unistd.h>
+#include <linux/kallsyms.h>
+
+#include "mdb.h"
+#include "mdb-ia32.h"
+#include "mdb-list.h"
+#include "mdb-ia32-proc.h"
+#include "mdb-base.h"
+#include "mdb-proc.h"
+#include "mdb-os.h"
+#include "mdb-keyboard.h"
+
+extern void MDBInitializeDebugger(void);
+extern void MDBClearDebuggerState(void);
+
+unsigned long TotalSystemMemory;
+unsigned long HistoryPointer;
+unsigned char HistoryBuffer[16][256];
+ /* remember non-repeating commands */
+unsigned char delim_table[256];
+unsigned char workBuffer[256];
+unsigned char verbBuffer[100];
+void set_delimiter(unsigned char c) { delim_table[c & 0xFF] = 1; }
+StackFrame CurrentStackFrame[MAX_PROCESSORS];
+atomic_t inmdb = { 0 };
+unsigned char *mdb_oops;
+unsigned char *last_mdb_oops;
+
+void SaveLastCommandInfo(unsigned long processor)
+{
+ register int i;
+
+ repeatCommand = 0;
+ lastCommand = toupper(debugCommand[0]);
+ lastDisplayLength = displayLength;
+ atomic_set(&focusActive, 0);
+ atomic_set(&traceProcessors[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;
+}
+
+int mdb(int reason, int error, void *frame)
+{
+ register unsigned long retCode = 0, processor = get_processor_id();
+ extern void ReadStackFrame(void *, StackFrame *, unsigned long);
+ extern void WriteStackFrame(void *, StackFrame *, unsigned long);
+ unsigned long state;
+#ifdef CONFIG_MDB_CONSOLE_REDIRECTION
+ extern int kmsg_redirect;
+ int kmsg_redirect_save;
+#endif
+
+ retCode = AlternateDebuggerRoutine(reason, error, frame);
+ if (retCode)
+ return retCode;
+
+ 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] = (unsigned long)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;
+}
+
+static inline void out_chars(int c, unsigned char ch)
+{
+ register int i;
+
+ for (i=0; i < c; i++)
+ DBGPrint("%c", ch);
+ return;
+}
+
+static inline void out_copy_chars_limit(int c, unsigned char ch,
+ unsigned char *s, int limit)
+{
+ register int i;
+
+ for (i=0; (i < c) && (i < limit); i++)
+ s[i] = ch;
+ s[i] = '\0';
+ DBGPrint("%s", s);
+ return;
+}
+
+static inline void out_buffer_chars_limit(unsigned char *s, int limit)
+{
+ register int i;
+
+ for (i=0; (i < strlen(s)) && (i < limit); i++)
+ DBGPrint("%c", s[i]);
+ return;
+}
+
+static inline void out_buffer_chars_limit_index(unsigned char *s, int limit,
+ int index)
+{
+ register int i;
+
+ for (i=0; (i < limit) && (s[i]); i++)
+ DBGPrint("%c", s[index + i]);
+ return;
+}
+
+static inline void out_string(unsigned char *s)
+{
+ DBGPrint("%s", s);
+ return;
+}
+
+static inline void out_char(unsigned char ch)
+{
+ DBGPrint("%c", ch);
+ return;
+}
+
+unsigned long ScreenInputFromKeyboard(unsigned char *buf,
+ unsigned long buf_index,
+ unsigned long max_index)
+{
+ register unsigned long key;
+ register unsigned char *p;
+ register int i, r, temp;
+ register unsigned long orig_index, HistoryIndex;
+ extern unsigned long IsAccelerator(unsigned long);
+
+ if (buf_index > max_index)
+ return 0;
+
+ if (!max_index)
+ return 0;
+
+ orig_index = buf_index;
+
+ p = (unsigned char *)((unsigned long)buf + (unsigned long)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--;
+ out_string("\b \b");
+
+ delta = strlen(buf) - buf_index;
+ out_chars(delta, ' ');
+ out_chars(delta, '\b');
+
+ p = (unsigned char *) &buf[buf_index];
+ temp = buf_index;
+ p++;
+ while ((*p) && (temp < max_index))
+ buf[temp++] = *p++;
+ buf[temp] = '\0';
+
+ delta = strlen(buf) - buf_index;
+ out_buffer_chars_limit_index(buf, delta, buf_index);
+ out_chars(delta, '\b');
+ }
+ break;
+
+ case K_P7: /* home */
+ {
+ unsigned char *s = &workBuffer[0];
+
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+ buf_index = orig_index;
+ }
+ break;
+
+ case K_P1: /* end */
+ {
+ unsigned char *s = &workBuffer[0];
+
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+ out_buffer_chars_limit(buf, 255);
+ buf_index = strlen(buf);
+ }
+ break;
+
+ case K_P4: /* left arrow */
+ if (buf_index)
+ {
+ buf_index--;
+ out_string("\b");
+ }
+ break;
+
+ case K_P6: /* right arrow */
+ if (buf_index < strlen(buf))
+ {
+ out_char(buf[buf_index]);
+ buf_index++;
+ }
+ break;
+
+ case K_PDOT:
+ {
+ register int delta;
+
+ delta = strlen(buf) - buf_index;
+
+ out_chars(delta, ' ');
+ out_chars(delta, '\b');
+
+ p = (unsigned char *) &buf[buf_index];
+ temp = buf_index;
+ p++;
+ while ((*p) && (temp < max_index))
+ buf[temp++] = *p++;
+ buf[temp] = '\0';
+
+ delta = strlen(buf) - buf_index;
+ out_buffer_chars_limit_index(buf, delta, buf_index);
+ out_chars(delta, '\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])
+ {
+ unsigned char *s = &workBuffer[0];
+
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+ out_copy_chars_limit(buf_index, ' ', s, 255);
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+
+ HistoryIndex--;
+
+ for (r=0; r < max_index; r++)
+ buf[r] = HistoryBuffer[HistoryIndex & 0xF][r];
+ buf_index = strlen(buf);
+
+ out_string(buf);
+ }
+ break;
+
+ case K_P2: /* down arrow */
+ if (HistoryBuffer[HistoryIndex & 0xF][0])
+ {
+ unsigned char *s = &workBuffer[0];
+
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+ out_copy_chars_limit(buf_index, ' ', s, 255);
+ out_copy_chars_limit(buf_index, '\b', s, 255);
+
+ HistoryIndex++;
+
+ for (r=0; r < max_index; r++)
+ buf[r] = HistoryBuffer[HistoryIndex & 0xF][r];
+ buf_index = strlen(buf);
+
+ out_string(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] = (unsigned char)key;
+ if (buf_index < max_index)
+ buf_index++;
+
+ delta = strlen(buf) - buf_index;
+ out_buffer_chars_limit_index(buf, delta, buf_index);
+ out_chars(delta, '\b');
+ }
+ }
+ break;
+ }
+ }
+}
+
+unsigned long debugger_command_entry(unsigned long processor,
+ unsigned long Exception,
+ StackFrame *stackFrame)
+{
+ register unsigned char *verb, *pp, *vp;
+ register unsigned long count, retCode, key;
+ extern unsigned long reason_toggle;
+ extern void displayRegisters(StackFrame *, unsigned long);
+
+ if (Exception > 22)
+ Exception = 20;
+
+ lastUnasmAddress = (unsigned long) GetIP(stackFrame);
+ lastLinkAddress = lastDumpAddress =
+ (unsigned char *) GetStackAddress(stackFrame);
+ lastDisplayLength = displayLength = 20;
+ lastCommandEntry = lastCommand;
+ nextline = 0;
+ pause_mode = 0;
+
+ if (!ssbmode)
+ {
+ if (reason_toggle && !ConsoleDisplayBreakReason(stackFrame,
+ Exception, processor, lastCommand))
+ return 0;
+ displayRegisters(stackFrame, processor);
+ }
+ nextUnasmAddress = disassemble(stackFrame, lastUnasmAddress, 1, 1);
+ ClearTempBreakpoints();
+ if (SSBUpdate(stackFrame, processor) == -1)
+ return 0;
+
+ while (1)
+ {
+ pause_mode = 1;
+ nextline = 0;
+ DBGPrint("(%i)> ", (int)processor);
+
+ SaveLastCommandInfo(processor);
+ key = ScreenInputFromKeyboard((unsigned char *)&debugCommand[0], 0, 80);
+ if (key)
+ {
+ extern unsigned long AccelRoutine(unsigned long 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 = (unsigned char *)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, (unsigned char *)debugCommand,
+ stackFrame, Exception);
+ switch (retCode)
+ {
+ case -1:
+ return retCode;
+ }
+ }
+ }
+}
+
+#if MDB_DEBUG_DEBUGGER
+unsigned char *kdebug_state[]=
+{
+ "",
+ "DIE_OOPS",
+ "DIE_INT3",
+ "DIE_DEBUG",
+ "DIE_PANIC",
+ "DIE_NMI",
+ "DIE_DIE",
+ "DIE_NMIWATCHDOG",
+ "DIE_KERNELDEBUG",
+ "DIE_TRAP",
+ "DIE_GPF",
+ "DIE_CALL",
+ "DIE_NMI_IPI",
+ "DIE_PAGE_FAULT",
+ "DIE_NMIUNKNOWN",
+};
+int kdebug_state_size = sizeof(kdebug_state) / sizeof(unsigned char *);
+#endif
+
+static int mdb_notify(struct notifier_block *nb, unsigned long reason,
+ void *data)
+{
+ register struct die_args *args = (struct die_args *)data;
+ register int err = 0;
+#if MDB_DEBUG_DEBUGGER
+ register unsigned long p = get_processor_id();
+
+ oops_in_progress = 1;
+ DBGPrint("%i: notify reason:%lu %s\n",
+ (int)p, reason, kdebug_state[reason % kdebug_state_size]);
+#else
+ oops_in_progress = 1;
+#endif
+ if (args)
+ {
+ switch (reason)
+ {
+ case DIE_DIE:
+ case DIE_PANIC:
+ case DIE_OOPS:
+ mdb_oops = (unsigned char *)args->str;
+ if (args->regs)
+ err = mdb(SOFTWARE_EXCEPTION, args->err, args->regs);
+ else
+ {
+ struct pt_regs *regs = get_irq_regs();
+
+ if (regs)
+ {
+ err = mdb(SOFTWARE_EXCEPTION, args->err, regs);
+ break;
+ }
+
+ /* if there are no regs passed on DIE_PANIC, or we
+ * cannot locate a local interrupt context, trigger an
+ * int 3 breakpoint and get the register context since
+ * we were apparently called from panic() outside of an
+ * exception.
+ */
+ oops_in_progress = 0;
+ mdb_breakpoint();
+ return NOTIFY_STOP;
+ }
+ break;
+
+ case DIE_INT3:
+ err = mdb(BREAKPOINT_EXCEPTION, args->err, args->regs);
+ break;
+
+ case DIE_DEBUG:
+ err = mdb(DEBUGGER_EXCEPTION, args->err, args->regs);
+ break;
+
+ case DIE_NMI:
+ case DIE_NMIWATCHDOG:
+ case DIE_NMIUNKNOWN:
+ case DIE_NMI_IPI:
+ err = mdb(NMI_EXCEPTION, args->err, args->regs);
+ break;
+
+ case DIE_KERNELDEBUG:
+ err = mdb(KEYBOARD_ENTRY, args->err, args->regs);
+ break;
+
+ case DIE_GPF:
+ err = mdb(GENERAL_PROTECTION, args->err, args->regs);
+ break;
+
+ case DIE_PAGE_FAULT:
+ err = mdb(PAGE_FAULT_EXCEPTION, args->err, args->regs);
+ break;
+
+ default:
+ break;
+ }
+ }
+ oops_in_progress = 0;
+ return (err ? NOTIFY_STOP : 0);
+}
+
+static struct notifier_block mdb_notifier =
+{
+ .notifier_call = mdb_notify,
+ .priority = 0x7FFFFFFF,
+};
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static void sysrq_mdb(int key, struct tty_struct *tty)
+{
+ {__asm__ __volatile__ ("int $0x03");};
+ return;
+}
+
+static struct sysrq_key_op sysrq_op =
+{
+ .handler = sysrq_mdb,
+ .help_msg = "mdb(J)",
+ .action_msg = "MDB",
+};
+#endif
+
+static int __init mdb_init_module(void)
+{
+ register int i;
+ register int ret = 0;
+
+ /* return if debugger already initialized */
+ if (debuggerInitialized)
+ return 0;
+
+ MDBInitializeDebugger();
+
+ ret = register_die_notifier(&mdb_notifier);
+ if (ret)
+ {
+ MDBClearDebuggerState();
+ return ret;
+ }
+
+#ifdef CONFIG_MAGIC_SYSRQ
+ register_sysrq_key('j', &sysrq_op);
+#endif
+
+ /* 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;
+}
+
+static void __exit mdb_exit_module(void)
+{
+#ifdef CONFIG_MAGIC_SYSRQ
+ unregister_sysrq_key('j', &sysrq_op);
+#endif
+ unregister_die_notifier(&mdb_notifier);
+ MDBClearDebuggerState();
+ return;
+}
+
+module_init(mdb_init_module);
+module_exit(mdb_exit_module);
+
+MODULE_DESCRIPTION("Merkey's Kernel Debugger");
+MODULE_LICENSE("GPL");
--
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