kgdb-lite for 2.6.2 (i386 specific parts)

[Pavel Machek]

Hi!

These are i386-specific parts. They probably can't go in as-is.

Change that worries me most is change of do_IRQ calling convention. If
that is dropped, kgdb will still work, but traceback through interrupt
will be impossible; right?
								Pavel

--- clean.2.5/arch/i386/Kconfig	2004-02-05 01:53:54.000000000 +0100
+++ linux-mm/arch/i386/Kconfig	2004-02-16 23:15:53.000000000 +0100
@@ -1253,6 +1253,20 @@
 	  If you say Y here, various routines which may sleep will become very
 	  noisy if they are called with a spinlock held.	
 
+config KGDB
+	bool "KGDB: kernel debugging with remote gdb"
+	depends on DEBUG_KERNEL
+	select DEBUG_INFO
+	select FRAME_POINTER
+	help
+	  If you say Y here, it will be possible to remotely debug the
+	  kernel using gdb. This enlarges your kernel image disk size by
+	  several megabytes and requires a machine with more than 128 MB
+	  RAM to avoid excessive linking time. 
+	  Documentation of kernel debugger available at
+	  http://kgdb.sourceforge.net
+	  This is only useful for kernel hackers. If unsure, say N.
+
 config FRAME_POINTER
 	bool "Compile the kernel with frame pointers"
 	help
--- clean.2.5/arch/i386/kernel/Makefile	2004-01-09 20:24:13.000000000 +0100
+++ linux-mm/arch/i386/kernel/Makefile	2004-02-16 23:09:06.000000000 +0100
@@ -31,6 +31,7 @@
 obj-$(CONFIG_ACPI_SRAT) 	+= srat.o
 obj-$(CONFIG_HPET_TIMER) 	+= time_hpet.o
 obj-$(CONFIG_EFI) 		+= efi.o efi_stub.o
+obj-$(CONFIG_KGDB)		+= i386-stub.o
 
 EXTRA_AFLAGS   := -traditional
 
--- clean.2.5/arch/i386/kernel/entry.S	2003-11-24 17:08:26.000000000 +0100
+++ linux-mm/arch/i386/kernel/entry.S	2004-02-16 23:09:06.000000000 +0100
@@ -399,7 +399,17 @@
 	ALIGN
 common_interrupt:
 	SAVE_ALL
+	movl %esp, %eax
+/* Create a fake function call followed by a fake function prologue to fool
+ * gdb into believing that this is a normal function call. */
+	pushl EIP(%eax)
+
+common_interrupt_1:
+	pushl %ebp
+	movl %esp, %ebp
+	pushl %eax
 	call do_IRQ
+	addl $12, %esp
 	jmp ret_from_intr
 
 #define BUILD_INTERRUPT(name, nr)	\
--- clean.2.5/arch/i386/kernel/i386-stub.c	2004-02-17 11:39:06.000000000 +0100
+++ linux-mm/arch/i386/kernel/i386-stub.c	2004-02-16 23:09:06.000000000 +0100
@@ -0,0 +1,373 @@
+/*
+ *
+ * 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; either version 2, or (at your option) 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.
+ *
+ */
+
+/*
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ */
+/*
+ *  Contributor:     Lake Stevens Instrument Division$
+ *  Written by:      Glenn Engel $
+ *  Updated by:	     Amit Kale<akale@xxxxxxxxxxx>
+ *  Modified for 386 by Jim Kingdon, Cygnus Support.
+ *  Origianl kgdb, compatibility with 2.1.xx kernel by David Grothe <dave@xxxxxxxx>
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <asm/vm86.h>
+#include <asm/system.h>
+#include <asm/ptrace.h>			/* for linux pt_regs struct */
+#include <linux/kgdb.h>
+#ifdef CONFIG_GDB_CONSOLE
+#include <linux/console.h>
+#endif
+#include <linux/init.h>
+#include <linux/debugger.h>
+
+/* Put the error code here just in case the user cares.  */
+int gdb_i386errcode;
+/* Likewise, the vector number here (since GDB only gets the signal
+   number through the usual means, and that's not very specific).  */
+int gdb_i386vector = -1;
+
+#if KGDB_MAX_NO_CPUS != 8
+#error change the definition of slavecpulocks
+#endif
+
+void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+    gdb_regs[_EAX] =  regs->eax;
+    gdb_regs[_EBX] =  regs->ebx;
+    gdb_regs[_ECX] =  regs->ecx;
+    gdb_regs[_EDX] =  regs->edx;
+    gdb_regs[_ESI] =  regs->esi;
+    gdb_regs[_EDI] =  regs->edi;
+    gdb_regs[_EBP] =  regs->ebp;
+    gdb_regs[ _DS] =  regs->xds;
+    gdb_regs[ _ES] =  regs->xes;
+    gdb_regs[ _PS] =  regs->eflags;
+    gdb_regs[ _CS] =  regs->xcs;
+    gdb_regs[ _PC] =  regs->eip;
+    gdb_regs[_ESP] =  (int) (&regs->esp) ;
+    gdb_regs[ _SS] =  __KERNEL_DS;
+    gdb_regs[ _FS] =  0xFFFF;
+    gdb_regs[ _GS] =  0xFFFF;
+}
+
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+	gdb_regs[_EAX] = 0;
+	gdb_regs[_EBX] = 0;
+	gdb_regs[_ECX] = 0;
+	gdb_regs[_EDX] = 0;
+	gdb_regs[_ESI] = 0;
+	gdb_regs[_EDI] = 0;
+	gdb_regs[_EBP] = *(int *)p->thread.esp;
+	gdb_regs[_DS]  = __KERNEL_DS;
+	gdb_regs[_ES]  = __KERNEL_DS;
+	gdb_regs[_PS]  = 0;
+	gdb_regs[_CS]  = __KERNEL_CS;
+	gdb_regs[_PC]  = p->thread.eip;
+	gdb_regs[_ESP] = p->thread.esp;
+	gdb_regs[_SS]  = __KERNEL_DS;
+	gdb_regs[_FS]  = 0xFFFF;
+	gdb_regs[_GS]  = 0xFFFF;
+}
+
+void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+    regs->eax	=     gdb_regs[_EAX] ;
+    regs->ebx	=     gdb_regs[_EBX] ;
+    regs->ecx	=     gdb_regs[_ECX] ;
+    regs->edx	=     gdb_regs[_EDX] ;
+    regs->esi	=     gdb_regs[_ESI] ;
+    regs->edi	=     gdb_regs[_EDI] ;
+    regs->ebp	=     gdb_regs[_EBP] ;
+    regs->xds	=     gdb_regs[ _DS] ;
+    regs->xes	=     gdb_regs[ _ES] ;
+    regs->eflags=     gdb_regs[ _PS] ;
+    regs->xcs	=     gdb_regs[ _CS] ;
+    regs->eip	=     gdb_regs[ _PC] ;
+#if 0					/* can't change these */
+    regs->esp	=     gdb_regs[_ESP] ;
+    regs->xss	=     gdb_regs[ _SS] ;
+    regs->fs	=     gdb_regs[ _FS] ;
+    regs->gs	=     gdb_regs[ _GS] ;
+#endif
+
+}
+
+struct hw_breakpoint {
+	unsigned enabled;
+	unsigned type;
+	unsigned len;
+	unsigned addr;
+} breakinfo[4] = { {
+enabled:0}, {
+enabled:0}, {
+enabled:0}, {
+enabled:0}};
+
+void kgdb_correct_hw_break(void)
+{
+	int breakno;
+	int correctit;
+	int breakbit;
+	unsigned dr7;
+
+	asm volatile ("movl %%db7, %0\n":"=r" (dr7)
+		      :);
+	do {
+		unsigned addr0, addr1, addr2, addr3;
+		asm volatile ("movl %%db0, %0\n"
+			      "movl %%db1, %1\n"
+			      "movl %%db2, %2\n"
+			      "movl %%db3, %3\n":"=r" (addr0), "=r"(addr1),
+			      "=r"(addr2), "=r"(addr3):);
+	} while (0);
+	correctit = 0;
+	for (breakno = 0; breakno < 3; breakno++) {
+		breakbit = 2 << (breakno << 1);
+		if (!(dr7 & breakbit) && breakinfo[breakno].enabled) {
+			correctit = 1;
+			dr7 |= breakbit;
+			dr7 &= ~(0xf0000 << (breakno << 2));
+			dr7 |= (((breakinfo[breakno].len << 2) |
+				 breakinfo[breakno].type) << 16) <<
+			    (breakno << 2);
+			switch (breakno) {
+			case 0:
+				asm volatile ("movl %0, %%dr0\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 1:
+				asm volatile ("movl %0, %%dr1\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 2:
+				asm volatile ("movl %0, %%dr2\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 3:
+				asm volatile ("movl %0, %%dr3\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+			}
+		} else if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
+			correctit = 1;
+			dr7 &= ~breakbit;
+			dr7 &= ~(0xf0000 << (breakno << 2));
+		}
+	}
+	if (correctit) {
+		asm volatile ("movl %0, %%db7\n"::"r" (dr7));
+	}
+}
+
+int kgdb_remove_hw_break(unsigned long addr, int type)
+{
+	int i, idx = -1;
+	for (i = 0; i < 4; i ++) {
+		if (breakinfo[i].addr == addr && breakinfo[i].enabled) {
+			idx = i;
+			break;
+		}
+	}
+	if (idx == -1)
+		return -1;
+
+	breakinfo[idx].enabled = 0;
+	return 0;
+}
+
+int kgdb_set_hw_break(unsigned long addr, int type)
+{
+	int i, idx = -1;
+	for (i = 0; i < 4; i ++) {
+		if (!breakinfo[i].enabled) {
+			idx = i;
+			break;
+		}
+	}
+	if (idx == -1)
+		return -1;
+
+	breakinfo[idx].enabled = 1;
+	breakinfo[idx].type = type;
+	breakinfo[idx].len = 1;
+	breakinfo[idx].addr = addr;
+	return 0;
+}
+
+int remove_hw_break(unsigned breakno)
+{
+	if (!breakinfo[breakno].enabled) {
+		return -1;
+	}
+	breakinfo[breakno].enabled = 0;
+	return 0;
+}
+
+int set_hw_break(unsigned breakno,
+		 unsigned type, unsigned len, unsigned addr)
+{
+	if (breakinfo[breakno].enabled) {
+		return -1;
+	}
+	breakinfo[breakno].enabled = 1;
+	breakinfo[breakno].type = type;
+	breakinfo[breakno].len = len;
+	breakinfo[breakno].addr = addr;
+	return 0;
+}
+
+void kgdb_printexceptioninfo(int exceptionNo, int errorcode, char *buffer)
+{
+	unsigned	dr6;
+	int		i;
+	switch (exceptionNo) {
+	case 1:		/* debug exception */
+		break;
+	case 3:		/* breakpoint */
+		sprintf(buffer, "Software breakpoint");
+		return;
+	default:
+		sprintf(buffer, "Details not available");
+		return;
+	}
+	asm volatile ("movl %%db6, %0\n":"=r" (dr6)
+		      :);
+	if (dr6 & 0x4000) {
+		sprintf(buffer, "Single step");
+		return;
+	}
+	for (i = 0; i < 4; ++i) {
+		if (dr6 & (1 << i)) {
+			sprintf(buffer, "Hardware breakpoint %d", i);
+			return;
+		}
+	}
+	sprintf(buffer, "Unknown trap");
+	return;
+}
+
+void kgdb_disable_hw_debug(struct pt_regs *regs) 
+{
+	/* Disable hardware debugging while we are in kgdb */
+	asm volatile("movl %0,%%db7": /* no output */ : "r"(0));
+}
+
+void kgdb_post_master_code(struct pt_regs *regs, int eVector, int err_code)
+{
+	/* Master processor is completely in the debugger */
+	gdb_i386vector = eVector;
+	gdb_i386errcode = err_code;
+}
+
+int kgdb_arch_handle_exception(int exceptionVector, int signo,
+		int err_code, char *remcomInBuffer, char *remcomOutBuffer,
+		struct pt_regs *linux_regs)
+{
+	long addr, length;
+	long breakno, breaktype;
+	char *ptr;
+	int newPC;
+	int dr6;
+	
+	switch (remcomInBuffer[0]) {
+	case 'c':
+	case 's':
+		if (kgdb_contthread && kgdb_contthread != current) {
+			strcpy(remcomOutBuffer, "E00");
+			break;
+		}
+
+		kgdb_contthread = NULL;
+
+		/* try to read optional parameter, pc unchanged if no parm */
+		ptr = &remcomInBuffer[1];
+		if (kgdb_hex2long(&ptr, &addr)) {
+			linux_regs->eip = addr;
+		} 
+		newPC = linux_regs->eip;
+		
+		/* clear the trace bit */
+		linux_regs->eflags &= 0xfffffeff;
+
+		/* set the trace bit if we're stepping */
+		if (remcomInBuffer[0] == 's') {
+			linux_regs->eflags |= 0x100;
+			debugger_step = 1;
+		}
+
+		asm volatile ("movl %%db6, %0\n" : "=r" (dr6));
+		if (!(dr6 & 0x4000)) {
+			for (breakno = 0; breakno < 4; ++breakno) {
+				if (dr6 & (1 << breakno)) {
+					if (breakinfo[breakno].type == 0) {
+						/* Set restore flag */
+						linux_regs->eflags |= 0x10000;
+						break;
+					}
+				}
+			}
+		}
+		kgdb_correct_hw_break();
+		asm volatile ("movl %0, %%db6\n"::"r" (0));
+
+		return (0);
+
+	case 'Y':
+		ptr = &remcomInBuffer[1];
+		kgdb_hex2long(&ptr, &breakno);
+		ptr++;
+		kgdb_hex2long(&ptr, &breaktype);
+		ptr++;
+		kgdb_hex2long(&ptr, &length);
+		ptr++;
+		kgdb_hex2long(&ptr, &addr);
+		if (set_hw_break(breakno & 0x3, breaktype & 0x3, 
+				 length & 0x3, addr) == 0) {
+			strcpy(remcomOutBuffer, "OK");
+		} else {
+			strcpy(remcomOutBuffer, "ERROR");
+		}
+		break;
+
+		/* Remove hardware breakpoint */
+	case 'y':
+		ptr = &remcomInBuffer[1];
+		kgdb_hex2long(&ptr, &breakno);
+		if (remove_hw_break(breakno & 0x3) == 0) {
+			strcpy(remcomOutBuffer, "OK");
+		} else {
+			strcpy(remcomOutBuffer, "ERROR");
+		}
+		break;
+
+	}		/* switch */
+	return -1; /* this means that we do not want to exit from the handler */
+}
+
+struct kgdb_arch arch_kgdb_ops =  {
+	.gdb_bpt_instr = {0xcc},
+	.flags = KGDB_HW_BREAKPOINT,
+};
--- clean.2.5/arch/i386/kernel/irq.c	2004-01-09 20:24:13.000000000 +0100
+++ linux-mm/arch/i386/kernel/irq.c	2004-02-16 23:09:06.000000000 +0100
@@ -410,7 +410,7 @@
  * SMP cross-CPU interrupts have their own specific
  * handlers).
  */
-asmlinkage unsigned int do_IRQ(struct pt_regs regs)
+asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
 {	
 	/* 
 	 * We ack quickly, we don't want the irq controller
@@ -422,7 +422,7 @@
 	 * 0 return value means that this irq is already being
 	 * handled by some other CPU. (or is disabled)
 	 */
-	int irq = regs.orig_eax & 0xff; /* high bits used in ret_from_ code  */
+	int irq = regs->orig_eax & 0xff; /* high bits used in ret_from_ code  */
 	irq_desc_t *desc = irq_desc + irq;
 	struct irqaction * action;
 	unsigned int status;
@@ -488,7 +488,7 @@
 		irqreturn_t action_ret;
 
 		spin_unlock(&desc->lock);
-		action_ret = handle_IRQ_event(irq, &regs, action);
+		action_ret = handle_IRQ_event(irq, regs, action);
 		spin_lock(&desc->lock);
 		if (!noirqdebug)
 			note_interrupt(irq, desc, action_ret);
--- clean.2.5/arch/i386/kernel/nmi.c	2003-08-10 21:22:30.000000000 +0200
+++ linux-mm/arch/i386/kernel/nmi.c	2004-02-16 23:09:06.000000000 +0100
@@ -25,6 +25,7 @@
 #include <linux/module.h>
 #include <linux/nmi.h>
 #include <linux/sysdev.h>
+#include <linux/debugger.h>
 
 #include <asm/smp.h>
 #include <asm/mtrr.h>
@@ -420,14 +421,25 @@
 	int sum, cpu = smp_processor_id();
 
 	sum = irq_stat[cpu].apic_timer_irqs;
+	if (atomic_read(&debugger_active)) {
 
-	if (last_irq_sums[cpu] == sum) {
+		/*
+		 * The machine is in debugger, hold this cpu if already
+		 * not held.
+		 */
+		debugger_nmihook(cpu, regs);
+		alert_counter[cpu] = 0;
+
+	} else if (last_irq_sums[cpu] == sum) {
 		/*
 		 * Ayiee, looks like this CPU is stuck ...
 		 * wait a few IRQs (5 seconds) before doing the oops ...
 		 */
 		alert_counter[cpu]++;
 		if (alert_counter[cpu] == 5*nmi_hz) {
+
+			CHK_DEBUGGER(2,SIGSEGV,0,regs,)
+
 			spin_lock(&nmi_print_lock);
 			/*
 			 * We are in trouble anyway, lets at least try
--- clean.2.5/arch/i386/kernel/signal.c	2003-11-24 17:08:26.000000000 +0100
+++ linux-mm/arch/i386/kernel/signal.c	2004-02-16 23:09:06.000000000 +0100
@@ -580,7 +580,8 @@
 		 * have been cleared if the watchpoint triggered
 		 * inside the kernel.
 		 */
-		__asm__("movl %0,%%db7"	: : "r" (current->thread.debugreg[7]));
+		if (current->thread.debugreg[7])
+			__asm__("movl %0,%%db7"	: : "r" (current->thread.debugreg[7]));
 
 		/* Whee!  Actually deliver the signal.  */
 		handle_signal(signr, &info, oldset, regs);
--- clean.2.5/arch/i386/kernel/traps.c	2003-10-18 20:26:27.000000000 +0200
+++ linux-mm/arch/i386/kernel/traps.c	2004-02-16 23:09:06.000000000 +0100
@@ -51,6 +51,7 @@
 
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/debugger.h>
 
 #include "mach_traps.h"
 
@@ -256,6 +257,7 @@
 {
 	static int die_counter;
 
+	CHK_DEBUGGER(1,SIGTRAP,err,regs,)
 	console_verbose();
 	spin_lock_irq(&die_lock);
 	bust_spinlocks(1);
@@ -330,6 +332,7 @@
 #define DO_ERROR(trapnr, signr, str, name) \
 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
 { \
+	CHK_DEBUGGER(trapnr,signr,error_code,regs,)\
 	do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \
 }
 
@@ -347,7 +350,10 @@
 #define DO_VM86_ERROR(trapnr, signr, str, name) \
 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
 { \
+	CHK_DEBUGGER(trapnr,signr,error_code,regs,goto skip_trap)\
 	do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \
+skip_trap: \
+	return; \
 }
 
 #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
@@ -547,7 +553,7 @@
 	tsk->thread.debugreg[6] = condition;
 
 	/* Mask out spurious TF errors due to lazy TF clearing */
-	if (condition & DR_STEP) {
+	if (condition & DR_STEP && !debugger_step) {
 		/*
 		 * The TF error should be masked out only if the current
 		 * process is not traced and if the TRAP flag has been set
@@ -570,11 +576,13 @@
 	info.si_errno = 0;
 	info.si_code = TRAP_BRKPT;
 	
-	/* If this is a kernel mode trap, save the user PC on entry to 
-	 * the kernel, that's what the debugger can make sense of.
-	 */
-	info.si_addr = ((regs->xcs & 3) == 0) ? (void *)tsk->thread.eip : 
-	                                        (void *)regs->eip;
+
+	/* If this is a kernel mode trap, we need to reset db7 to allow us
+	 * to continue sanely */
+	if ((regs->xcs & 3) == 0)
+		goto clear_dr7;
+
+	info.si_addr = (void *)regs->eip;
 	force_sig_info(SIGTRAP, &info, tsk);
 
 	/* Disable additional traps. They'll be re-enabled when
@@ -584,6 +592,7 @@
 	__asm__("movl %0,%%db7"
 		: /* no output */
 		: "r" (0));
+	CHK_DEBUGGER(1,SIGTRAP,error_code,regs,)
 	return;
 
 debug_vm86:
--- clean.2.5/arch/i386/mm/fault.c	2003-12-21 20:29:03.000000000 +0100
+++ linux-mm/arch/i386/mm/fault.c	2004-02-16 23:09:06.000000000 +0100
@@ -2,6 +2,11 @@
  *  linux/arch/i386/mm/fault.c
  *
  *  Copyright (C) 1995  Linus Torvalds
+ *
+ *  Change History
+ *
+ *	Tigran Aivazian <tigran@xxxxxxx>	Remote debugging support.
+ *
  */
 
 #include <linux/signal.h>
@@ -21,6 +26,7 @@
 #include <linux/vt_kern.h>		/* For unblank_screen() */
 #include <linux/highmem.h>
 #include <linux/module.h>
+#include <linux/debugger.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -399,6 +405,8 @@
  	if (is_prefetch(regs, address))
  		return;
 
+	CHK_DEBUGGER(14, SIGSEGV,error_code, regs,)
+
 /*
  * Oops. The kernel tried to access some bad page. We'll have to
  * terminate things with extreme prejudice.
--- clean.2.5/include/asm-i386/kgdb.h	2004-02-17 11:39:24.000000000 +0100
+++ linux-mm/include/asm-i386/kgdb.h	2004-02-16 23:09:06.000000000 +0100
@@ -0,0 +1,49 @@
+#ifndef _ASM_KGDB_H_
+#define _ASM_KGDB_H_
+
+/*
+ * Copyright (C) 2001-2004 Amit S. Kale
+ */
+
+#include <linux/ptrace.h>
+
+/* gdb locks */
+#define KGDB_MAX_NO_CPUS 8
+
+/************************************************************************/
+/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
+/* at least NUMREGBYTES*2 are needed for register packets */
+/* Longer buffer is needed to list all threads */
+#define BUFMAX 1024
+
+/* Number of bytes of registers.  */
+#define NUMREGBYTES 64
+/*
+ *  Note that this register image is in a different order than
+ *  the register image that Linux produces at interrupt time.
+ *  
+ *  Linux's register image is defined by struct pt_regs in ptrace.h.
+ *  Just why GDB uses a different order is a historical mystery.
+ */
+enum regnames { _EAX,  /* 0 */
+	_ECX,  /* 1 */
+	_EDX,  /* 2 */
+	_EBX,  /* 3 */
+	_ESP,  /* 4 */
+	_EBP,  /* 5 */
+	_ESI,  /* 6 */
+	_EDI,  /* 7 */
+	_PC,   /* 8 also known as eip */
+	_PS,   /* 9 also known as eflags */
+	_CS,   /* 10 */
+	_SS,   /* 11 */
+	_DS,   /* 12 */
+	_ES,   /* 13 */
+	_FS,   /* 14 */
+	_GS    /* 15 */
+};
+
+#define BREAKPOINT() asm("   int $3");
+#define BREAK_INSTR_SIZE       1
+
+#endif /* _ASM_KGDB_H_ */
--- clean.2.5/include/asm-i386/processor.h	2004-01-09 20:24:24.000000000 +0100
+++ linux-mm/include/asm-i386/processor.h	2004-02-16 23:09:06.000000000 +0100
@@ -425,6 +425,8 @@
 	unsigned int		saved_fs, saved_gs;
 /* IO permissions */
 	unsigned long	*io_bitmap_ptr;
+	void *		debuggerinfo;
+
 };
 
 #define INIT_THREAD  {							\


-- 
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
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