Re: kgdb-lite for 2.6.2 (i386 specific parts)

From: Amit S. Kale
Date: Tue Feb 17 2004 - 07:30:42 EST

On Tuesday 17 Feb 2004 5:10 pm, Pavel Machek wrote:
> 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?

Yes. do_IRQ calling convention required only for backtrace to go through an
interrupt entry point.

-Amit


> 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 { \

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