Message-ID: <478F66F6.40107@siemens.com>
Date:	Thu, 17 Jan 2008 15:32:22 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] kgdb:unify x86-kgdb

diff -up arch/x86/kernel/kgdb_32.c arch/x86/kernel/kgdb_64.c

screamed for unification. Here it is.

Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>

---
 arch/x86/kernel/Makefile_32 |    2 
 arch/x86/kernel/Makefile_64 |    2 
 arch/x86/kernel/kgdb.c      |  561 ++++++++++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/kgdb_32.c   |  414 --------------------------------
 arch/x86/kernel/kgdb_64.c   |  495 --------------------------------------
 5 files changed, 563 insertions(+), 911 deletions(-)

Index: b/arch/x86/kernel/Makefile_32
===================================================================
--- a/arch/x86/kernel/Makefile_32
+++ b/arch/x86/kernel/Makefile_32
@@ -37,7 +37,7 @@ obj-y				+= sysenter_32.o vsyscall_32.o
 obj-$(CONFIG_ACPI_SRAT) 	+= srat_32.o
 obj-$(CONFIG_EFI) 		+= efi_32.o efi_stub_32.o
 obj-$(CONFIG_DOUBLEFAULT) 	+= doublefault_32.o
-obj-$(CONFIG_KGDB)		+= kgdb_32.o kgdb-jmp_32.o
+obj-$(CONFIG_KGDB)		+= kgdb.o kgdb-jmp_32.o
 obj-$(CONFIG_VM86)		+= vm86_32.o
 obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 obj-$(CONFIG_HPET_TIMER) 	+= hpet.o
Index: b/arch/x86/kernel/Makefile_64
===================================================================
--- a/arch/x86/kernel/Makefile_64
+++ b/arch/x86/kernel/Makefile_64
@@ -31,7 +31,7 @@ obj-$(CONFIG_GART_IOMMU)	+= pci-gart_64.
 obj-$(CONFIG_CALGARY_IOMMU)	+= pci-calgary_64.o tce_64.o
 obj-$(CONFIG_SWIOTLB)		+= pci-swiotlb_64.o
 obj-$(CONFIG_KPROBES)		+= kprobes_64.o
-obj-$(CONFIG_KGDB)		+= kgdb_64.o kgdb-jmp_64.o
+obj-$(CONFIG_KGDB)		+= kgdb.o kgdb-jmp_64.o
 obj-$(CONFIG_X86_PM_TIMER)	+= pmtimer_64.o
 obj-$(CONFIG_X86_VSMP)		+= vsmp_64.o
 obj-$(CONFIG_K8_NB)		+= k8.o
Index: b/arch/x86/kernel/kgdb.c
===================================================================
--- /dev/null
+++ b/arch/x86/kernel/kgdb.c
@@ -0,0 +1,561 @@
+/*
+ * arch/x86/kernel/kgdb.c
+ *
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002 Andi Kleen, SuSE Labs
+ * Copyright (C) 2004 Amit S. Kale <amitkale@...syssoft.com>
+ * Copyright (C) 2004 LinSysSoft Technologies Pvt. Ltd.
+ * Copyright (C) 2007 Jason Wessel, Wind River Systems, Inc.
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ *
+ *
+ * Contributors at various stages not listed above:
+ *  Lake Stevens Instrument Division (Glenn Engel)
+ *  Tom Rini <trini@...nel.crashing.org>
+ *  Jim Kingdon, Cygnus Support.
+ *  David Grothe <dave@...m.com>
+ *  Tigran Aivazian <tigran@....com>
+ *  Jim Houston
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#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/system.h>
+#include <linux/ptrace.h>		/* for linux pt_regs struct */
+#include <linux/kgdb.h>
+#include <linux/init.h>
+#include <linux/kdebug.h>
+#ifdef CONFIG_X86_32
+#include <mach_ipi.h>
+#else /* !CONFIG_X86_32 */
+#include <asm/mach_apic.h>
+#endif /* !CONFIG_X86_32 */
+
+/* Put the error code here just in case the user cares.  */
+int gdb_x86_errcode;
+/* Likewise, the vector number here (since GDB only gets the signal
+   number through the usual means, and that's not very specific).  */
+int gdb_x86_vector = -1;
+
+#ifdef CONFIG_X86_32
+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;
+	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];
+}
+
+#else /* CONFIG_X86_64 */
+
+void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+	gdb_regs[_RAX] = regs->rax;
+	gdb_regs[_RBX] = regs->rbx;
+	gdb_regs[_RCX] = regs->rcx;
+	gdb_regs[_RDX] = regs->rdx;
+	gdb_regs[_RSI] = regs->rsi;
+	gdb_regs[_RDI] = regs->rdi;
+	gdb_regs[_RBP] = regs->rbp;
+	gdb_regs[_PS] = regs->eflags;
+	gdb_regs[_PC] = regs->rip;
+	gdb_regs[_R8] = regs->r8;
+	gdb_regs[_R9] = regs->r9;
+	gdb_regs[_R10] = regs->r10;
+	gdb_regs[_R11] = regs->r11;
+	gdb_regs[_R12] = regs->r12;
+	gdb_regs[_R13] = regs->r13;
+	gdb_regs[_R14] = regs->r14;
+	gdb_regs[_R15] = regs->r15;
+	gdb_regs[_RSP] = regs->rsp;
+}
+
+extern void thread_return(void);
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+	gdb_regs[_RAX] = 0;
+	gdb_regs[_RBX] = 0;
+	gdb_regs[_RCX] = 0;
+	gdb_regs[_RDX] = 0;
+	gdb_regs[_RSI] = 0;
+	gdb_regs[_RDI] = 0;
+	gdb_regs[_RBP] = *(unsigned long *)p->thread.rsp;
+	gdb_regs[_PS] = *(unsigned long *)(p->thread.rsp + 8);
+	gdb_regs[_PC] = (unsigned long)&thread_return;
+	gdb_regs[_R8] = 0;
+	gdb_regs[_R9] = 0;
+	gdb_regs[_R10] = 0;
+	gdb_regs[_R11] = 0;
+	gdb_regs[_R12] = 0;
+	gdb_regs[_R13] = 0;
+	gdb_regs[_R14] = 0;
+	gdb_regs[_R15] = 0;
+	gdb_regs[_RSP] = p->thread.rsp;
+}
+
+void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+	regs->rax = gdb_regs[_RAX];
+	regs->rbx = gdb_regs[_RBX];
+	regs->rcx = gdb_regs[_RCX];
+	regs->rdx = gdb_regs[_RDX];
+	regs->rsi = gdb_regs[_RSI];
+	regs->rdi = gdb_regs[_RDI];
+	regs->rbp = gdb_regs[_RBP];
+	regs->eflags = gdb_regs[_PS];
+	regs->rip = gdb_regs[_PC];
+	regs->r8 = gdb_regs[_R8];
+	regs->r9 = gdb_regs[_R9];
+	regs->r10 = gdb_regs[_R10];
+	regs->r11 = gdb_regs[_R11];
+	regs->r12 = gdb_regs[_R12];
+	regs->r13 = gdb_regs[_R13];
+	regs->r14 = gdb_regs[_R14];
+	regs->r15 = gdb_regs[_R15];
+}
+#endif /* CONFIG_X86_64 */
+
+static struct hw_breakpoint {
+	unsigned enabled;
+	unsigned type;
+	unsigned len;
+	unsigned long addr;
+} breakinfo[4] = {
+	{ .enabled = 0 },
+	{ .enabled = 0 },
+	{ .enabled = 0 },
+	{ .enabled = 0 },
+};
+
+static void kgdb_correct_hw_break(void)
+{
+	int breakno;
+	int breakbit;
+	int correctit = 0;
+	unsigned long dr7;
+
+	get_debugreg(dr7, 7);
+	for (breakno = 0; breakno < 4; 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) <<
+			       ((breakno << 2) + 16);
+			switch (breakno) {
+			case 0:
+				set_debugreg(breakinfo[0].addr, 0);
+				break;
+
+			case 1:
+				set_debugreg(breakinfo[1].addr, 1);
+				break;
+
+			case 2:
+				set_debugreg(breakinfo[2].addr, 2);
+				break;
+
+			case 3:
+				set_debugreg(breakinfo[3].addr, 3);
+				break;
+			}
+		} else if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
+			correctit = 1;
+			dr7 &= ~breakbit;
+			dr7 &= ~(0xf0000 << (breakno << 2));
+		}
+	}
+	if (correctit)
+		set_debugreg(dr7, 7);
+}
+
+static int kgdb_remove_hw_break(unsigned long addr, int len,
+				enum kgdb_bptype bptype)
+{
+	int i;
+
+	for (i = 0; i < 4; i++)
+		if (breakinfo[i].addr == addr && breakinfo[i].enabled)
+			break;
+	if (i == 4)
+		return -1;
+
+	breakinfo[i].enabled = 0;
+	return 0;
+}
+
+static void kgdb_remove_all_hw_break(void)
+{
+	int i;
+
+	for (i = 0; i < 4; i++)
+		memset(&breakinfo[i], 0, sizeof(struct hw_breakpoint));
+}
+
+static int kgdb_set_hw_break(unsigned long addr, int len,
+			     enum kgdb_bptype bptype)
+{
+	int i;
+	unsigned type;
+
+	for (i = 0; i < 4; i++)
+		if (!breakinfo[i].enabled)
+			break;
+	if (i == 4)
+		return -1;
+
+	switch (bptype) {
+	case bp_hardware_breakpoint:
+		type = 0;
+		len  = 1;
+		break;
+	case bp_write_watchpoint:
+		type = 1;
+		break;
+	case bp_access_watchpoint:
+		type = 3;
+		break;
+	default:
+		return -1;
+	}
+
+	if (len == 1 || len == 2 || len == 4)
+		breakinfo[i].len  = len - 1;
+	else
+		return -1;
+
+	breakinfo[i].enabled = 1;
+	breakinfo[i].addr = addr;
+	breakinfo[i].type = type;
+	return 0;
+}
+
+void kgdb_disable_hw_debug(struct pt_regs *regs)
+{
+	/* Disable hardware debugging while we are in kgdb */
+	set_debugreg(0UL, 7);
+}
+
+void kgdb_post_master_code(struct pt_regs *regs, int e_vector, int err_code)
+{
+	/* Master processor is completely in the debugger */
+	gdb_x86_vector = e_vector;
+	gdb_x86_errcode = err_code;
+}
+
+#ifdef CONFIG_SMP
+void kgdb_roundup_cpus(unsigned long flags)
+{
+	send_IPI_allbutself(APIC_DM_NMI);
+}
+#endif
+
+int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
+			       char *remcom_in_buffer, char *remcom_out_buffer,
+			       struct pt_regs *linux_regs)
+{
+	unsigned long addr;
+	char *ptr;
+	int newPC;
+	unsigned long dr6;
+
+	switch (remcom_in_buffer[0]) {
+	case 'c':
+	case 's':
+		/* try to read optional parameter, pc unchanged if no parm */
+		ptr = &remcom_in_buffer[1];
+		if (kgdb_hex2long(&ptr, &addr))
+			instruction_pointer(linux_regs) = addr;
+		newPC = instruction_pointer(linux_regs);
+
+		/* clear the trace bit */
+		linux_regs->eflags &= ~TF_MASK;
+		atomic_set(&cpu_doing_single_step, -1);
+
+		/* set the trace bit if we're stepping */
+		if (remcom_in_buffer[0] == 's') {
+			linux_regs->eflags |= TF_MASK;
+			debugger_step = 1;
+			if (kgdb_contthread)
+				atomic_set(&cpu_doing_single_step,
+					   raw_smp_processor_id());
+
+		}
+
+		get_debugreg(dr6, 6);
+		if (!(dr6 & 0x4000)) {
+			int breakno;
+
+			for (breakno = 0; breakno < 4; ++breakno) {
+				if (dr6 & (1 << breakno) &&
+				    breakinfo[breakno].type == 0) {
+					/* Set restore flag */
+					linux_regs->eflags |= X86_EFLAGS_RF;
+					break;
+				}
+			}
+		}
+		set_debugreg(0UL, 6);
+		kgdb_correct_hw_break();
+
+		return 0;
+	}
+	/* this means that we do not want to exit from the handler */
+	return -1;
+}
+
+#ifdef CONFIG_X86_64
+static struct pt_regs *in_interrupt_stack(unsigned long rsp, int cpu)
+{
+	struct pt_regs *regs = NULL;
+	unsigned long end = (unsigned long)cpu_pda(cpu)->irqstackptr;
+
+	if (rsp <= end && rsp >= end - IRQSTACKSIZE + 8)
+		regs = *(((struct pt_regs **)end) - 1);
+
+	return regs;
+}
+
+static struct pt_regs *in_exception_stack(unsigned long rsp, int cpu)
+{
+	struct tss_struct *init_tss = &__get_cpu_var(init_tss);
+	struct pt_regs *regs;
+	int i;
+
+	for (i = 0; i < N_EXCEPTION_STACKS; i++)
+		if (rsp >= init_tss[cpu].ist[i] &&
+		    rsp <= init_tss[cpu].ist[i] + EXCEPTION_STKSZ) {
+			regs = (void *) init_tss[cpu].ist[i] + EXCEPTION_STKSZ;
+			return regs - 1;
+		}
+
+	return NULL;
+}
+
+void kgdb_shadowinfo(struct pt_regs *regs, char *buffer, unsigned threadid)
+{
+	static char intr_desc[] = "Stack at interrupt entrypoint";
+	static char exc_desc[] = "Stack at exception entrypoint";
+	struct pt_regs *stregs;
+	int cpu = raw_smp_processor_id();
+	stregs = in_interrupt_stack(regs->rsp, cpu);
+	if (stregs)
+		kgdb_mem2hex(intr_desc, buffer, strlen(intr_desc));
+	else {
+		stregs = in_exception_stack(regs->rsp, cpu);
+		if (stregs)
+			kgdb_mem2hex(exc_desc, buffer, strlen(exc_desc));
+	}
+}
+
+struct task_struct *kgdb_get_shadow_thread(struct pt_regs *regs, int threadid)
+{
+	struct pt_regs *stregs;
+	int cpu = raw_smp_processor_id();
+
+	stregs = in_interrupt_stack(regs->rsp, cpu);
+	if (stregs)
+		return current;
+	else {
+		stregs = in_exception_stack(regs->rsp, cpu);
+		if (stregs)
+			return current;
+	}
+
+	return NULL;
+}
+
+struct pt_regs *kgdb_shadow_regs(struct pt_regs *regs, int threadid)
+{
+	struct pt_regs *stregs;
+	int cpu = raw_smp_processor_id();
+
+	stregs = in_interrupt_stack(regs->rsp, cpu);
+	if (stregs)
+		return stregs;
+	else {
+		stregs = in_exception_stack(regs->rsp, cpu);
+		if (stregs)
+			return stregs;
+	}
+
+	return NULL;
+}
+#endif /* CONFIG_X86_64 */
+
+static inline int single_step_cont(struct pt_regs *regs,
+			struct die_args *args)
+{
+	/* single step exception from kernel space to user space so
+	 * eat the exception and continue the process
+	 */
+	printk(KERN_ERR "KGDB: trap/step from kernel to user space,"
+			" resuming...\n");
+	kgdb_arch_handle_exception(args->trapnr, args->signr,
+				   args->err, "c", "", regs);
+
+	return NOTIFY_STOP;
+}
+
+static int kgdb_notify(struct notifier_block *self, unsigned long cmd,
+		       void *ptr)
+{
+	struct die_args *args = ptr;
+	struct pt_regs *regs = args->regs;
+
+	switch (cmd) {
+	case DIE_NMI:
+		if (atomic_read(&debugger_active)) {
+			/* KGDB CPU roundup */
+			kgdb_nmihook(raw_smp_processor_id(), regs);
+			return NOTIFY_STOP;
+		}
+		return NOTIFY_DONE;
+	case DIE_NMI_IPI:
+		if (atomic_read(&debugger_active)) {
+			/* KGDB CPU roundup */
+			if (kgdb_nmihook(raw_smp_processor_id(), regs))
+				return NOTIFY_DONE;
+			return NOTIFY_STOP;
+		}
+		return NOTIFY_DONE;
+	case DIE_NMIWATCHDOG:
+		if (atomic_read(&debugger_active)) {
+			/* KGDB CPU roundup */
+			kgdb_nmihook(raw_smp_processor_id(), regs);
+			return NOTIFY_STOP;
+		}
+		/* Enter debugger */
+		break;
+	case DIE_DEBUG:
+		if (atomic_read(&cpu_doing_single_step) ==
+			raw_smp_processor_id() && user_mode(regs))
+			return single_step_cont(regs, args);
+		/* fall through */
+	default:
+		if (user_mode(regs))
+			return NOTIFY_DONE;
+	}
+
+	if (kgdb_may_fault) {
+		kgdb_fault_longjmp(kgdb_fault_jmp_regs);
+		return NOTIFY_STOP;
+	}
+
+	if (kgdb_handle_exception(args->trapnr, args->signr,
+				  args->err, regs))
+		return NOTIFY_DONE;
+
+	return NOTIFY_STOP;
+}
+
+static struct notifier_block kgdb_notifier = {
+	.notifier_call = kgdb_notify,
+	.priority = 0x7fffffff,	/* we need to be notified first */
+};
+
+int kgdb_arch_init(void)
+{
+	register_die_notifier(&kgdb_notifier);
+	return 0;
+}
+
+/*
+ * Skip an int3 exception when it occurs after a breakpoint has been
+ * removed. Backtrack eip by 1 since the int3 would have caused it to
+ * increment by 1.
+ */
+
+int kgdb_skipexception(int exception, struct pt_regs *regs)
+{
+	if (exception == 3 &&
+	    kgdb_isremovedbreak(instruction_pointer(regs) - 1)) {
+		instruction_pointer(regs) -= 1;
+		return 1;
+	}
+	return 0;
+}
+
+unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
+{
+	if (exception == 3)
+		return instruction_pointer(regs) - 1;
+	return instruction_pointer(regs);
+}
+
+struct kgdb_arch arch_kgdb_ops = {
+	.gdb_bpt_instr = {0xcc},
+	.flags = KGDB_HW_BREAKPOINT,
+#ifdef CONFIG_X86_64
+	.shadowth = 1,
+#endif
+	.set_hw_breakpoint = kgdb_set_hw_break,
+	.remove_hw_breakpoint = kgdb_remove_hw_break,
+	.remove_all_hw_break = kgdb_remove_all_hw_break,
+	.correct_hw_break = kgdb_correct_hw_break,
+};
Index: b/arch/x86/kernel/kgdb_32.c
===================================================================
--- a/arch/x86/kernel/kgdb_32.c
+++ /dev/null
@@ -1,414 +0,0 @@
-/*
- *
- * 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.
- * Copyright (C) 2007 Wind River Systems, Inc.
- * Copyright (C) 2007 MontaVista Software, Inc.
- */
-/*
- *  Contributor:     Lake Stevens Instrument Division$
- *  Written by:      Glenn Engel $
- *  Updated by:	     Amit Kale<akale@...itas.com>
- *  Updated by:	     Tom Rini <trini@...nel.crashing.org>
- *  Updated by:	     Jason Wessel <jason.wessel@...driver.com>
- *  Modified for 386 by Jim Kingdon, Cygnus Support.
- *  Origianl kgdb, compatibility with 2.1.xx kernel by
- *  David Grothe <dave@...m.com>
- *  Additional support from Tigran Aivazian <tigran@....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 <linux/ptrace.h>		/* for linux pt_regs struct */
-#include <linux/kgdb.h>
-#include <linux/init.h>
-#include <linux/kdebug.h>
-#include <asm/apicdef.h>
-#include <asm/desc.h>
-
-#include "mach_ipi.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;
-
-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;
-	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];
-}
-
-static struct hw_breakpoint {
-	unsigned enabled;
-	unsigned type;
-	unsigned len;
-	unsigned addr;
-} breakinfo[4] = {
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-};
-
-static void kgdb_correct_hw_break(void)
-{
-	int breakno;
-	int breakbit;
-	int correctit = 0;
-	unsigned long dr7;
-
-	get_debugreg(dr7, 7);
-	for (breakno = 0; breakno < 4; 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) <<
-			       ((breakno << 2) + 16);
-			switch (breakno) {
-			case 0:
-				set_debugreg(breakinfo[0].addr, 0);
-				break;
-
-			case 1:
-				set_debugreg(breakinfo[1].addr, 1);
-				break;
-
-			case 2:
-				set_debugreg(breakinfo[2].addr, 2);
-				break;
-
-			case 3:
-				set_debugreg(breakinfo[3].addr, 3);
-				break;
-			}
-		} else if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
-			correctit = 1;
-			dr7 &= ~breakbit;
-			dr7 &= ~(0xf0000 << (breakno << 2));
-		}
-	}
-	if (correctit)
-		set_debugreg(dr7, 7);
-}
-
-static int kgdb_remove_hw_break(unsigned long addr, int len,
-				enum kgdb_bptype bptype)
-{
-	int i;
-
-	for (i = 0; i < 4; i++)
-		if (breakinfo[i].addr == addr && breakinfo[i].enabled)
-			break;
-	if (i == 4)
-		return -1;
-
-	breakinfo[i].enabled = 0;
-	return 0;
-}
-
-static void kgdb_remove_all_hw_break(void)
-{
-	int i;
-
-	for (i = 0; i < 4; i++)
-		memset(&breakinfo[i], 0, sizeof(struct hw_breakpoint));
-}
-
-static int kgdb_set_hw_break(unsigned long addr, int len,
-			     enum kgdb_bptype bptype)
-{
-	int i;
-	unsigned type;
-
-	for (i = 0; i < 4; i++)
-		if (!breakinfo[i].enabled)
-			break;
-	if (i == 4)
-		return -1;
-
-	switch (bptype) {
-	case bp_hardware_breakpoint:
-		type = 0;
-		len  = 1;
-		break;
-	case bp_write_watchpoint:
-		type = 1;
-		break;
-	case bp_access_watchpoint:
-		type = 3;
-		break;
-	default:
-		return -1;
-	}
-
-	if (len == 1 || len == 2 || len == 4)
-		breakinfo[i].len  = len - 1;
-	else
-		return -1;
-
-	breakinfo[i].enabled = 1;
-	breakinfo[i].addr = addr;
-	breakinfo[i].type = type;
-	return 0;
-}
-
-void kgdb_disable_hw_debug(struct pt_regs *regs)
-{
-	/* Disable hardware debugging while we are in kgdb */
-	set_debugreg(0, 7);
-}
-
-void kgdb_post_master_code(struct pt_regs *regs, int e_vector, int err_code)
-{
-	/* Master processor is completely in the debugger */
-	gdb_i386vector = e_vector;
-	gdb_i386errcode = err_code;
-}
-
-#ifdef CONFIG_SMP
-void kgdb_roundup_cpus(unsigned long flags)
-{
-	send_IPI_allbutself(APIC_DM_NMI);
-}
-#endif
-
-int kgdb_arch_handle_exception(int e_vector, int signo,
-			       int err_code, char *remcom_in_buffer,
-			       char *remcom_out_buffer,
-			       struct pt_regs *linux_regs)
-{
-	long addr;
-	char *ptr;
-	int newPC;
-	int dr6;
-
-	switch (remcom_in_buffer[0]) {
-	case 'c':
-	case 's':
-		/* 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 &= ~TF_MASK;
-		atomic_set(&cpu_doing_single_step, -1);
-
-		/* set the trace bit if we're stepping */
-		if (remcom_in_buffer[0] == 's') {
-			linux_regs->eflags |= TF_MASK;
-			debugger_step = 1;
-			atomic_set(&cpu_doing_single_step,
-				   raw_smp_processor_id());
-		}
-
-		get_debugreg(dr6, 6);
-		if (!(dr6 & 0x4000)) {
-			int breakno;
-			for (breakno = 0; breakno < 4; ++breakno) {
-				if (dr6 & (1 << breakno) &&
-				    breakinfo[breakno].type == 0) {
-					/* Set restore flag */
-					linux_regs->eflags |= X86_EFLAGS_RF;
-					break;
-				}
-			}
-		}
-		set_debugreg(0, 6);
-		kgdb_correct_hw_break();
-
-		return 0;
-	}
-	/* this means that we do not want to exit from the handler */
-	return -1;
-}
-
-static inline int single_step_cont(struct pt_regs *regs,
-			struct die_args *args)
-{
-	/* single step exception from kernel space to user space so
-	 * eat the exception and continue the process
-	 */
-	printk(KERN_ERR "KGDB: trap/step from kernel to user space,"
-			" resuming...\n");
-	kgdb_arch_handle_exception(args->trapnr, args->signr,
-			args->err, "c", "", regs);
-
-	return NOTIFY_STOP;
-}
-
-static int kgdb_notify(struct notifier_block *self, unsigned long cmd,
-		       void *ptr)
-{
-	struct die_args *args = ptr;
-	struct pt_regs *regs = args->regs;
-
-	switch (cmd) {
-	case DIE_NMI:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			kgdb_nmihook(raw_smp_processor_id(), regs);
-			return NOTIFY_STOP;
-		}
-		return NOTIFY_DONE;
-	case DIE_NMI_IPI:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			if (kgdb_nmihook(raw_smp_processor_id(), regs))
-				return NOTIFY_DONE;
-			return NOTIFY_STOP;
-		}
-		return NOTIFY_DONE;
-	case DIE_NMIWATCHDOG:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			kgdb_nmihook(raw_smp_processor_id(), regs);
-			return NOTIFY_STOP;
-		}
-		/* Enter debugger */
-		break;
-	case DIE_DEBUG:
-		if (atomic_read(&cpu_doing_single_step) ==
-			raw_smp_processor_id() &&
-			user_mode(regs))
-			return single_step_cont(regs, args);
-		/* fall through */
-	default:
-		if (user_mode(regs))
-			return NOTIFY_DONE;
-	}
-
-	if (kgdb_may_fault) {
-		kgdb_fault_longjmp(kgdb_fault_jmp_regs);
-		return NOTIFY_STOP;
-	}
-
-	if (kgdb_handle_exception(args->trapnr, args->signr,
-	   args->err, regs))
-		return NOTIFY_DONE;
-
-	return NOTIFY_STOP;
-}
-
-static struct notifier_block kgdb_notifier = {
-	.notifier_call = kgdb_notify,
-};
-
-int kgdb_arch_init(void)
-{
-	register_die_notifier(&kgdb_notifier);
-	return 0;
-}
-
-/*
- * Skip an int3 exception when it occurs after a breakpoint has been
- * removed. Backtrack eip by 1 since the int3 would have caused it to
- * increment by 1.
- */
-
-int kgdb_skipexception(int exception, struct pt_regs *regs)
-{
-	if (exception == 3 && kgdb_isremovedbreak(regs->eip - 1)) {
-		regs->eip -= 1;
-		return 1;
-	}
-	return 0;
-}
-
-unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
-{
-	if (exception == 3)
-		return instruction_pointer(regs) - 1;
-
-	return instruction_pointer(regs);
-}
-
-struct kgdb_arch arch_kgdb_ops = {
-	.gdb_bpt_instr = {0xcc},
-	.flags = KGDB_HW_BREAKPOINT,
-	.set_hw_breakpoint = kgdb_set_hw_break,
-	.remove_hw_breakpoint = kgdb_remove_hw_break,
-	.remove_all_hw_break = kgdb_remove_all_hw_break,
-	.correct_hw_break = kgdb_correct_hw_break,
-};
Index: b/arch/x86/kernel/kgdb_64.c
===================================================================
--- a/arch/x86/kernel/kgdb_64.c
+++ /dev/null
@@ -1,495 +0,0 @@
-/*
- *
- * 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) 2004 Amit S. Kale <amitkale@...syssoft.com>
- * Copyright (C) 2000-2001 VERITAS Software Corporation.
- * Copyright (C) 2002 Andi Kleen, SuSE Labs
- * Copyright (C) 2004 LinSysSoft Technologies Pvt. Ltd.
- * Copyright (C) 2007 Jason Wessel, Wind River Systems, Inc.
- * Copyright (C) 2007 MontaVista Software, Inc.
- */
-/****************************************************************************
- *  Contributor:     Lake Stevens Instrument Division$
- *  Written by:      Glenn Engel $
- *  Updated by:	     Amit Kale<akale@...itas.com>
- *  Modified for 386 by Jim Kingdon, Cygnus Support.
- *  Origianl kgdb, compatibility with 2.1.xx kernel by
- *  David Grothe <dave@...m.com>
- *  Integrated into 2.2.5 kernel by Tigran Aivazian <tigran@....com>
- *  X86_64 changes from Andi Kleen's patch merged by Jim Houston
- */
-
-#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/system.h>
-#include <linux/ptrace.h>		/* for linux pt_regs struct */
-#include <linux/kgdb.h>
-#include <linux/init.h>
-#include <linux/kdebug.h>
-#include <asm/apicdef.h>
-#include <asm/mach_apic.h>
-#include <asm/debugreg.h>
-
-/* Put the error code here just in case the user cares.  */
-int gdb_x86_64errcode;
-/* Likewise, the vector number here (since GDB only gets the signal
-   number through the usual means, and that's not very specific).  */
-int gdb_x86_64vector = -1;
-
-void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-	gdb_regs[_RAX] = regs->rax;
-	gdb_regs[_RBX] = regs->rbx;
-	gdb_regs[_RCX] = regs->rcx;
-	gdb_regs[_RDX] = regs->rdx;
-	gdb_regs[_RSI] = regs->rsi;
-	gdb_regs[_RDI] = regs->rdi;
-	gdb_regs[_RBP] = regs->rbp;
-	gdb_regs[_PS] = regs->eflags;
-	gdb_regs[_PC] = regs->rip;
-	gdb_regs[_R8] = regs->r8;
-	gdb_regs[_R9] = regs->r9;
-	gdb_regs[_R10] = regs->r10;
-	gdb_regs[_R11] = regs->r11;
-	gdb_regs[_R12] = regs->r12;
-	gdb_regs[_R13] = regs->r13;
-	gdb_regs[_R14] = regs->r14;
-	gdb_regs[_R15] = regs->r15;
-	gdb_regs[_RSP] = regs->rsp;
-}
-
-extern void thread_return(void);
-void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
-{
-	gdb_regs[_RAX] = 0;
-	gdb_regs[_RBX] = 0;
-	gdb_regs[_RCX] = 0;
-	gdb_regs[_RDX] = 0;
-	gdb_regs[_RSI] = 0;
-	gdb_regs[_RDI] = 0;
-	gdb_regs[_RBP] = *(unsigned long *)p->thread.rsp;
-	gdb_regs[_PS] = *(unsigned long *)(p->thread.rsp + 8);
-	gdb_regs[_PC] = (unsigned long)&thread_return;
-	gdb_regs[_R8] = 0;
-	gdb_regs[_R9] = 0;
-	gdb_regs[_R10] = 0;
-	gdb_regs[_R11] = 0;
-	gdb_regs[_R12] = 0;
-	gdb_regs[_R13] = 0;
-	gdb_regs[_R14] = 0;
-	gdb_regs[_R15] = 0;
-	gdb_regs[_RSP] = p->thread.rsp;
-}
-
-void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
-{
-	regs->rax = gdb_regs[_RAX];
-	regs->rbx = gdb_regs[_RBX];
-	regs->rcx = gdb_regs[_RCX];
-	regs->rdx = gdb_regs[_RDX];
-	regs->rsi = gdb_regs[_RSI];
-	regs->rdi = gdb_regs[_RDI];
-	regs->rbp = gdb_regs[_RBP];
-	regs->eflags = gdb_regs[_PS];
-	regs->rip = gdb_regs[_PC];
-	regs->r8 = gdb_regs[_R8];
-	regs->r9 = gdb_regs[_R9];
-	regs->r10 = gdb_regs[_R10];
-	regs->r11 = gdb_regs[_R11];
-	regs->r12 = gdb_regs[_R12];
-	regs->r13 = gdb_regs[_R13];
-	regs->r14 = gdb_regs[_R14];
-	regs->r15 = gdb_regs[_R15];
-}				/* gdb_regs_to_regs */
-
-static struct hw_breakpoint {
-	unsigned enabled;
-	unsigned type;
-	unsigned len;
-	unsigned long addr;
-} breakinfo[4] = {
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-	{ .enabled = 0 },
-};
-
-static void kgdb_correct_hw_break(void)
-{
-	int breakno;
-	int breakbit;
-	int correctit = 0;
-	unsigned long dr7;
-
-	get_debugreg(dr7, 7);
-	for (breakno = 0; breakno < 4; 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) <<
-			       ((breakno << 2) + 16);
-			switch (breakno) {
-			case 0:
-				set_debugreg(breakinfo[0].addr, 0);
-				break;
-
-			case 1:
-				set_debugreg(breakinfo[1].addr, 1);
-				break;
-
-			case 2:
-				set_debugreg(breakinfo[2].addr, 2);
-				break;
-
-			case 3:
-				set_debugreg(breakinfo[3].addr, 3);
-				break;
-			}
-		} else if ((dr7 & breakbit) && !breakinfo[breakno].enabled) {
-			correctit = 1;
-			dr7 &= ~breakbit;
-			dr7 &= ~(0xf0000 << (breakno << 2));
-		}
-	}
-	if (correctit)
-		set_debugreg(dr7, 7);
-}
-
-static int kgdb_remove_hw_break(unsigned long addr, int len,
-				enum kgdb_bptype bptype)
-{
-	int i;
-
-	for (i = 0; i < 4; i++)
-		if (breakinfo[i].addr == addr && breakinfo[i].enabled)
-			break;
-	if (i == 4)
-		return -1;
-
-	breakinfo[i].enabled = 0;
-	return 0;
-}
-
-static void kgdb_remove_all_hw_break(void)
-{
-	int i;
-
-	for (i = 0; i < 4; i++)
-		memset(&breakinfo[i], 0, sizeof(struct hw_breakpoint));
-}
-
-static int kgdb_set_hw_break(unsigned long addr, int len,
-			     enum kgdb_bptype bptype)
-{
-	int i;
-	unsigned type;
-
-	for (i = 0; i < 4; i++)
-		if (!breakinfo[i].enabled)
-			break;
-	if (i == 4)
-		return -1;
-
-	switch (bptype) {
-	case bp_hardware_breakpoint:
-		type = 0;
-		len  = 1;
-		break;
-	case bp_write_watchpoint:
-		type = 1;
-		break;
-	case bp_access_watchpoint:
-		type = 3;
-		break;
-	default:
-		return -1;
-	}
-
-	if (len == 1 || len == 2 || len == 4)
-		breakinfo[i].len  = len - 1;
-	else
-		return -1;
-
-	breakinfo[i].enabled = 1;
-	breakinfo[i].addr = addr;
-	breakinfo[i].type = type;
-	return 0;
-}
-
-void kgdb_disable_hw_debug(struct pt_regs *regs)
-{
-	/* Disable hardware debugging while we are in kgdb */
-	set_debugreg(0UL, 7);
-}
-
-void kgdb_post_master_code(struct pt_regs *regs, int e_vector, int err_code)
-{
-	/* Master processor is completely in the debugger */
-	gdb_x86_64vector = e_vector;
-	gdb_x86_64errcode = err_code;
-}
-
-void kgdb_roundup_cpus(unsigned long flags)
-{
-	send_IPI_allbutself(APIC_DM_NMI);
-}
-
-int kgdb_arch_handle_exception(int e_vector, int signo, int err_code,
-			       char *remcomInBuffer, char *remcomOutBuffer,
-			       struct pt_regs *linux_regs)
-{
-	unsigned long addr;
-	char *ptr;
-	int newPC;
-	unsigned long dr6;
-
-	switch (remcomInBuffer[0]) {
-	case 'c':
-	case 's':
-		/* try to read optional parameter, pc unchanged if no parm */
-		ptr = &remcomInBuffer[1];
-		if (kgdb_hex2long(&ptr, &addr))
-			linux_regs->rip = addr;
-		newPC = linux_regs->rip;
-
-		/* clear the trace bit */
-		linux_regs->eflags &= ~TF_MASK;
-		atomic_set(&cpu_doing_single_step, -1);
-
-		/* set the trace bit if we're stepping */
-		if (remcomInBuffer[0] == 's') {
-			linux_regs->eflags |= TF_MASK;
-			debugger_step = 1;
-			if (kgdb_contthread)
-				atomic_set(&cpu_doing_single_step,
-					   raw_smp_processor_id());
-
-		}
-
-		get_debugreg(dr6, 6);
-		if (!(dr6 & 0x4000)) {
-			int breakno;
-
-			for (breakno = 0; breakno < 4; ++breakno) {
-				if (dr6 & (1 << breakno) &&
-				    breakinfo[breakno].type == 0) {
-					/* Set restore flag */
-					linux_regs->eflags |= X86_EFLAGS_RF;
-					break;
-				}
-			}
-		}
-		set_debugreg(0UL, 6);
-		kgdb_correct_hw_break();
-
-		return 0;
-	}
-	/* this means that we do not want to exit from the handler */
-	return -1;
-}
-
-static struct pt_regs *in_interrupt_stack(unsigned long rsp, int cpu)
-{
-	struct pt_regs *regs = NULL;
-	unsigned long end = (unsigned long)cpu_pda(cpu)->irqstackptr;
-
-	if (rsp <= end && rsp >= end - IRQSTACKSIZE + 8)
-		regs = *(((struct pt_regs **)end) - 1);
-
-	return regs;
-}
-
-static struct pt_regs *in_exception_stack(unsigned long rsp, int cpu)
-{
-	struct tss_struct *init_tss = &__get_cpu_var(init_tss);
-	struct pt_regs *regs;
-	int i;
-
-	for (i = 0; i < N_EXCEPTION_STACKS; i++)
-		if (rsp >= init_tss[cpu].ist[i] &&
-		    rsp <= init_tss[cpu].ist[i] + EXCEPTION_STKSZ) {
-			regs = (void *) init_tss[cpu].ist[i] + EXCEPTION_STKSZ;
-			return regs - 1;
-		}
-
-	return NULL;
-}
-
-void kgdb_shadowinfo(struct pt_regs *regs, char *buffer, unsigned threadid)
-{
-	static char intr_desc[] = "Stack at interrupt entrypoint";
-	static char exc_desc[] = "Stack at exception entrypoint";
-	struct pt_regs *stregs;
-	int cpu = raw_smp_processor_id();
-	stregs = in_interrupt_stack(regs->rsp, cpu);
-	if (stregs)
-		kgdb_mem2hex(intr_desc, buffer, strlen(intr_desc));
-	else {
-		stregs = in_exception_stack(regs->rsp, cpu);
-		if (stregs)
-			kgdb_mem2hex(exc_desc, buffer, strlen(exc_desc));
-	}
-}
-
-struct task_struct *kgdb_get_shadow_thread(struct pt_regs *regs, int threadid)
-{
-	struct pt_regs *stregs;
-	int cpu = raw_smp_processor_id();
-
-	stregs = in_interrupt_stack(regs->rsp, cpu);
-	if (stregs)
-		return current;
-	else {
-		stregs = in_exception_stack(regs->rsp, cpu);
-		if (stregs)
-			return current;
-	}
-
-	return NULL;
-}
-
-struct pt_regs *kgdb_shadow_regs(struct pt_regs *regs, int threadid)
-{
-	struct pt_regs *stregs;
-	int cpu = raw_smp_processor_id();
-
-	stregs = in_interrupt_stack(regs->rsp, cpu);
-	if (stregs)
-		return stregs;
-	else {
-		stregs = in_exception_stack(regs->rsp, cpu);
-		if (stregs)
-			return stregs;
-	}
-
-	return NULL;
-}
-
-static inline int single_step_cont(struct pt_regs *regs,
-			struct die_args *args)
-{
-	/* single step exception from kernel space to user space so
-	 * eat the exception and continue the process
-	 */
-	printk(KERN_ERR "KGDB: trap/step from kernel to user space,"
-			" resuming...\n");
-	kgdb_arch_handle_exception(args->trapnr, args->signr,
-			args->err, "c", "", regs);
-
-	return NOTIFY_STOP;
-}
-
-static int kgdb_notify(struct notifier_block *self, unsigned long cmd,
-		       void *ptr)
-{
-	struct die_args *args = ptr;
-	struct pt_regs *regs = args->regs;
-
-	switch (cmd) {
-	case DIE_NMI:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			kgdb_nmihook(raw_smp_processor_id(), regs);
-			return NOTIFY_STOP;
-		}
-		return NOTIFY_DONE;
-	case DIE_NMI_IPI:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			if (kgdb_nmihook(raw_smp_processor_id(), regs))
-				return NOTIFY_DONE;
-			return NOTIFY_STOP;
-		}
-		return NOTIFY_DONE;
-	case DIE_NMIWATCHDOG:
-		if (atomic_read(&debugger_active)) {
-			/* KGDB CPU roundup */
-			kgdb_nmihook(raw_smp_processor_id(), regs);
-			return NOTIFY_STOP;
-		}
-		/* Enter debugger */
-		break;
-	case DIE_DEBUG:
-		if (atomic_read(&cpu_doing_single_step) ==
-			raw_smp_processor_id() &&
-			user_mode(regs))
-			return single_step_cont(regs, args);
-		/* fall through */
-	default:
-		if (user_mode(regs))
-			return NOTIFY_DONE;
-	}
-
-	if (kgdb_may_fault) {
-		kgdb_fault_longjmp(kgdb_fault_jmp_regs);
-		return NOTIFY_STOP;
-	}
-
-	if (kgdb_handle_exception(args->trapnr, args->signr,
-		args->err, regs))
-		return NOTIFY_DONE;
-
-	return NOTIFY_STOP;
-}
-
-static struct notifier_block kgdb_notifier = {
-	.notifier_call = kgdb_notify,
-	.priority = 0x7fffffff,	/* we need to be notified first */
-};
-
-int kgdb_arch_init(void)
-{
-	register_die_notifier(&kgdb_notifier);
-	return 0;
-}
-
-/*
- * Skip an int3 exception when it occurs after a breakpoint has been
- * removed. Backtrack eip by 1 since the int3 would have caused it to
- * increment by 1.
- */
-
-int kgdb_skipexception(int exception, struct pt_regs *regs)
-{
-	if (exception == 3 && kgdb_isremovedbreak(regs->rip - 1)) {
-		regs->rip -= 1;
-		return 1;
-	}
-	return 0;
-}
-
-unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs)
-{
-	if (exception == 3)
-		return instruction_pointer(regs) - 1;
-	return instruction_pointer(regs);
-}
-
-struct kgdb_arch arch_kgdb_ops = {
-	.gdb_bpt_instr = {0xcc},
-	.flags = KGDB_HW_BREAKPOINT,
-	.shadowth = 1,
-	.set_hw_breakpoint = kgdb_set_hw_break,
-	.remove_hw_breakpoint = kgdb_remove_hw_break,
-	.remove_all_hw_break = kgdb_remove_all_hw_break,
-	.correct_hw_break = kgdb_correct_hw_break,
-};
--
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