i386-lite [patch 2/3] [Re: kgdb for mainline kernel: core-lite [patch 1/3]]

Amit S. Kale
2004-03-09T09:34:24Z

i386 part with this email
-Amit

On Tuesday 09 Mar 2004 2:59 pm, Amit S. Kale wrote:
> I attempted it and found that it works better than my expectation! I am
> attaching revised core-lite.patch with this email and sending
> i386-lite.patch as a reply.

Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/Kconfig
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/Kconfig 2004-03-08
14:30:07.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/Kconfig 2004-03-09 14:16:55.226362584
+0530
@@ -1253,6 +1253,8 @@
If you say Y here, various routines which may sleep will become very
noisy if they are called with a spinlock held.

+source "kernel/Kconfig.kgdb"
+
config FRAME_POINTER
bool "Compile the kernel with frame pointers"
help
Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/Makefile
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/Makefile 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/Makefile 2004-03-09
14:16:55.241360304 +0530
@@ -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) += kgdb.o

EXTRA_AFLAGS := -traditional

Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/irq.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/irq.c 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/irq.c 2004-03-09
14:16:55.242360152 +0530
@@ -34,6 +34,7 @@
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kallsyms.h>
+#include <linux/kgdb.h>

#include <asm/atomic.h>
#include <asm/io.h>
@@ -508,6 +509,8 @@

irq_exit();

+ kgdb_process_breakpoint();
+
return 1;
}

Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/kgdb.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/kgdb.c 2003-01-30
15:54:37.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/kgdb.c 2004-03-09
14:19:34.200194888 +0530
@@ -0,0 +1,380 @@
+/*
+ *
+ * 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@veritas.com>
+ * Modified for 386 by Jim Kingdon, Cygnus Support.
+ * Origianl kgdb, compatibility with 2.1.xx kernel by David Grothe
<dave@gcom.com>
+ */
+
+#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;
+}
+
+/*
+ * Extracts ebp, esp and eip values understandable by gdb from the values
+ * saved by switch_to.
+ * thread.esp points to ebp. flags and ebp are pushed in switch_to hence esp
+ * prior to entering switch_to is 8 greater then the value that is saved.
+ * If switch_to changes, change following code appropriately.
+ */
+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] = *(unsigned long *)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 + 8;
+ 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 *remcom_in_buffer,
+ char *remcom_out_buffer,
+ struct pt_regs *linux_regs)
+{
+ long addr, length;
+ long breakno, breaktype;
+ char *ptr;
+ int newPC;
+ int dr6;
+
+ switch (remcom_in_buffer[0]) {
+ case 'c':
+ case 's':
+ if (kgdb_contthread && kgdb_contthread != current) {
+ strcpy(remcom_out_buffer, "E00");
+ break;
+ }
+
+ kgdb_contthread = NULL;
+
+ /* try to read optional parameter, pc unchanged if no parm */
+ ptr = &remcom_in_buffer[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 (remcom_in_buffer[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 = &remcom_in_buffer[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(remcom_out_buffer, "OK");
+ } else {
+ strcpy(remcom_out_buffer, "ERROR");
+ }
+ break;
+
+ /* Remove hardware breakpoint */
+ case 'y':
+ ptr = &remcom_in_buffer[1];
+ kgdb_hex2long(&ptr, &breakno);
+ if (remove_hw_break(breakno & 0x3) == 0) {
+ strcpy(remcom_out_buffer, "OK");
+ } else {
+ strcpy(remcom_out_buffer, "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,
+};
Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/nmi.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/nmi.c 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/nmi.c 2004-03-09
14:16:55.260357416 +0530
@@ -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
Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/signal.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/signal.c 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/signal.c 2004-03-09
14:16:55.274355288 +0530
@@ -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);
Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/traps.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/kernel/traps.c 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/kernel/traps.c 2004-03-09
14:16:55.275355136 +0530
@@ -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:
Index: linux-2.6.4-rc2-bk3-kgdb/arch/i386/mm/fault.c
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/arch/i386/mm/fault.c 2004-03-08
14:30:06.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/arch/i386/mm/fault.c 2004-03-09
14:16:55.284353768 +0530
@@ -2,6 +2,11 @@
* linux/arch/i386/mm/fault.c
*
* Copyright (C) 1995 Linus Torvalds
+ *
+ * Change History
+ *
+ * Tigran Aivazian <tigran@sco.com> 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.
@@ -406,6 +414,7 @@

bust_spinlocks(1);

+
if (address < PAGE_SIZE)
printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
else
Index: linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/kgdb.h
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/include/asm-i386/kgdb.h 2003-01-30
15:54:37.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/kgdb.h 2004-03-09
14:16:55.284353768 +0530
@@ -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_ */
Index: linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/processor.h
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/include/asm-i386/processor.h 2004-03-08
14:30:19.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/processor.h 2004-03-09
14:16:55.290352856 +0530
@@ -425,6 +425,8 @@
unsigned int saved_fs, saved_gs;
/* IO permissions */
unsigned long *io_bitmap_ptr;
+ void * debuggerinfo;
+
};

#define INIT_THREAD { \
Index: linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/system.h
===================================================================
--- linux-2.6.4-rc2-bk3-kgdb.orig/include/asm-i386/system.h 2004-03-08
14:30:19.000000000 +0530
+++ linux-2.6.4-rc2-bk3-kgdb/include/asm-i386/system.h 2004-03-09
14:16:55.297351792 +0530
@@ -12,6 +12,8 @@
struct task_struct; /* one of the stranger aspects of C forward
declarations.. */
extern struct task_struct * FASTCALL(__switch_to(struct task_struct *prev,
struct task_struct *next));

+/* sleeping_thread_to_gdb_regs depends on this code. Correct it if you change
+ * any of the following */
#define switch_to(prev,next,last) do { \
unsigned long esi,edi; \
asm volatile("pushfl\n\t" \