x86_64-lite.patch

Linux-2.6.18内核调试工具补丁程序KGDB。

This adds support for the x86_64 architecture.  In addition to what was noted
in the core-lite patch about stuff outside of new files, we add -g0 to
compiling of syscalls.o as otherwise we run into problems when debugging
modules, and like i386 annotate switch_to().

Signed-off-by: Milind Dumbare <[e-mail]>

arch/x86_64/Kconfig.debug     |    3
 arch/x86_64/kernel/Makefile   |    1
 arch/x86_64/kernel/kgdb-jmp.S |   65 +++++
 arch/x86_64/kernel/kgdb.c     |  474 ++++++++++++++++++++++++++++++++++++++++++
 include/asm-x86_64/kgdb.h     |   50 ++++
 include/asm-x86_64/system.h   |    6
 include/linux/kgdb.h          |    4
 kernel/kgdb.c                 |   14 +
 lib/Kconfig.debug             |    2
 9 files changed, 613 insertions(+), 6 deletions(-)

Index: linux-2.6.15-rc6-x86_64/arch/x86_64/Kconfig.debug
===================================================================
--- linux-2.6.15-rc6-x86_64.orig/arch/x86_64/Kconfig.debug	2005-12-21 10:09:55.000000000 +0530
+++ linux-2.6.15-rc6-x86_64/arch/x86_64/Kconfig.debug	2005-12-26 14:01:58.318765792 +0530
@@ -32,7 +32,4 @@
          Add a simple leak tracer to the IOMMU code. This is useful when you
 	 are debugging a buggy device driver that leaks IOMMU mappings.
 
-#config X86_REMOTE_DEBUG
-#       bool "kgdb debugging stub"
-
 endmenu
Index: linux-2.6.15-rc6-x86_64/arch/x86_64/kernel/kgdb-jmp.S
===================================================================
--- linux-2.6.15-rc6-x86_64.orig/arch/x86_64/kernel/kgdb-jmp.S	2005-12-26 12:14:53.973528792 +0530
+++ linux-2.6.15-rc6-x86_64/arch/x86_64/kernel/kgdb-jmp.S	2005-12-26 14:01:58.320765488 +0530
@@ -0,0 +1,65 @@
+/*
+ * arch/x86_64/kernel/kgdb-jmp.S
+ *
+ * Save and restore system registers so that within a limited frame we
+ * may have a fault and "jump back" to a known safe location.
+ *
+ * Author: Tom Rini <[e-mail]>
+ *
+ * Cribbed from glibc, which carries the following:
+ * Copyright (C) 2001, 2003, 2004 Free Software Foundation, Inc.
+ * Copyright (C) 2005 by MontaVista Software.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program as licensed "as is" without any warranty of
+ * any kind, whether express or implied.
+ */
+
+#include <linux/linkage.h>
+
+#define JB_RBX		0
+#define JB_RBP		1
+#define JB_R12		2
+#define JB_R13		3
+#define JB_R14		4
+#define JB_R15		5
+#define JB_RSP		6
+#define JB_PC		7
+
+	.code64
+
+/* This must be called prior to kgdb_fault_longjmp and
+ * kgdb_fault_longjmp must not be called outside of the context of the
+ * last call to kgdb_fault_setjmp.
+ */
+ENTRY(kgdb_fault_setjmp)
+	/* Save registers. */
+	movq %rbx, (JB_RBX*8)(%rdi)
+	movq %rbp, (JB_RBP*8)(%rdi)
+	movq %r12, (JB_R12*8)(%rdi)
+	movq %r13, (JB_R13*8)(%rdi)
+	movq %r14, (JB_R14*8)(%rdi)
+	movq %r15, (JB_R15*8)(%rdi)
+	leaq 8(%rsp), %rdx	/* Save SP as it will be after we return. */
+	movq %rdx, (JB_RSP*8)(%rdi)
+	movq (%rsp), %rax	/* Save PC we are returning to now. */
+	movq %rax, (JB_PC*8)(%rdi)
+	/* Set return value for setjmp. */
+	mov $0,%eax
+	movq (JB_PC*8)(%rdi),%rdx
+	movq (JB_RSP*8)(%rdi),%rsp
+	jmpq *%rdx
+
+ENTRY(kgdb_fault_longjmp)
+	/* Restore registers. */
+	movq (JB_RBX*8)(%rdi),%rbx
+	movq (JB_RBP*8)(%rdi),%rbp
+	movq (JB_R12*8)(%rdi),%r12
+	movq (JB_R13*8)(%rdi),%r13
+	movq (JB_R14*8)(%rdi),%r14
+	movq (JB_R15*8)(%rdi),%r15
+	/* Set return value for setjmp. */
+	movq (JB_PC*8)(%rdi),%rdx
+	movq (JB_RSP*8)(%rdi),%rsp
+	mov $1,%eax
+	jmpq *%rdx
Index: linux-2.6.15-rc6-x86_64/arch/x86_64/kernel/kgdb.c
===================================================================
--- linux-2.6.15-rc6-x86_64.orig/arch/x86_64/kernel/kgdb.c	2005-12-26 12:14:53.973528792 +0530
+++ linux-2.6.15-rc6-x86_64/arch/x86_64/kernel/kgdb.c	2005-12-26 14:03:37.529683440 +0530
@@ -0,0 +1,474 @@
+/*
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ */
+
+/*
+ * Copyright (C) 2004 Amit S. Kale <[e-mail]>
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002 Andi Kleen, SuSE Labs
+ * Copyright (C) 2004 LinSysSoft Technologies Pvt. Ltd.
+ */
+/****************************************************************************
+ *  Contributor:     Lake Stevens Instrument Division$
+ *  Written by:      Glenn Engel $
+ *  Updated by:	     Amit Kale<[e-mail]>
+ *  Modified for 386 by Jim Kingdon, Cygnus Support.
+ *  Origianl kgdb, compatibility with 2.1.xx kernel by
+ *  David Grothe <[e-mail]>
+ *  Integrated into 2.2.5 kernel by Tigran Aivazian <[e-mail]>
+ *  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 <asm/ptrace.h>		/* for linux pt_regs struct */
+#include <linux/kgdb.h>
+#include <linux/init.h>
+#include <asm/apicdef.h>
+#include <asm/mach_apic.h>
+#include <asm/kdebug.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;
+
+extern atomic_t cpu_doing_single_step;
+
+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];
+#if 0				/* can't change these */
+	regs->rsp = gdb_regs[_RSP];
+	regs->ss = gdb_regs[_SS];
+	regs->fs = gdb_regs[_FS];
+	regs->gs = gdb_regs[_GS];
+#endif
+
+}				/* gdb_regs_to_regs */
+
+struct hw_breakpoint {
+	unsigned enabled;
+	unsigned type;
+	unsigned len;
+	unsigned long addr;
+} breakinfo[4] = { {
+enabled:0}, {
+enabled:0}, {
+enabled:0}, {
+enabled:0}};
+
+void kgdb_correct_hw_break(void)
+{
+	int breakno;
+	int correctit;
+	int breakbit;
+	unsigned long dr7;
+
+	asm volatile ("movq %%db7, %0\n":"=r" (dr7):);
+	do {
+		unsigned long addr0, addr1, addr2, addr3;
+		asm volatile ("movq %%db0, %0\n"
+			      "movq %%db1, %1\n"
+			      "movq %%db2, %2\n"
+			      "movq %%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 ("movq %0, %%dr0\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 1:
+				asm volatile ("movq %0, %%dr1\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 2:
+				asm volatile ("movq %0, %%dr2\n"::"r"
+					      (breakinfo[breakno].addr));
+				break;
+
+			case 3:
+				asm volatile ("movq %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 ("movq %0, %%db7\n"::"r" (dr7));
+	}
+}
+
+int kgdb_remove_hw_break(unsigned long addr)
+{
+	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 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 = 1;
+	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_disable_hw_debug(struct pt_regs *regs)
+{
+	/* Disable hardware debugging while we are in kgdb */
+	asm volatile ("movq %0,%%db7": /* no output */ :"r" (0UL));
+}
+
+void kgdb_post_master_code(struct pt_regs *regs, int e_vector, int err_code)
+{
+	/* Master processor is completely in the debugger */