DOCBOOKS := wanbook.xml z8530book.xml mcabook.xml videobook.xml \
kernel-hacking.xml kernel-locking.xml deviceiobook.xml \
procfs-guide.xml writing_usb_driver.xml networking.xml \
- kernel-api.xml filesystems.xml lsm.xml usb.xml \
+ kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \
gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \
genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml
--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
+
+<book id="kgdbOnLinux">
+ <bookinfo>
+ <title>Using kgdb and the kgdb Internals</title>
+
+ <authorgroup>
+ <author>
+ <firstname>Jason</firstname>
+ <surname>Wessel</surname>
+ <affiliation>
+ <address>
+ <email>jason.wessel@windriver.com</email>
+ </address>
+ </affiliation>
+ </author>
+ </authorgroup>
+
+ <authorgroup>
+ <author>
+ <firstname>Tom</firstname>
+ <surname>Rini</surname>
+ <affiliation>
+ <address>
+ <email>trini@kernel.crashing.org</email>
+ </address>
+ </affiliation>
+ </author>
+ </authorgroup>
+
+ <authorgroup>
+ <author>
+ <firstname>Amit S.</firstname>
+ <surname>Kale</surname>
+ <affiliation>
+ <address>
+ <email>amitkale@linsyssoft.com</email>
+ </address>
+ </affiliation>
+ </author>
+ </authorgroup>
+
+ <copyright>
+ <year>2008</year>
+ <holder>Wind River Systems, Inc.</holder>
+ </copyright>
+ <copyright>
+ <year>2004-2005</year>
+ <holder>MontaVista Software, Inc.</holder>
+ </copyright>
+ <copyright>
+ <year>2004</year>
+ <holder>Amit S. Kale</holder>
+ </copyright>
+
+ <legalnotice>
+ <para>
+ 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.
+ </para>
+
+ </legalnotice>
+ </bookinfo>
+
+<toc></toc>
+ <chapter id="Introduction">
+ <title>Introduction</title>
+ <para>
+ kgdb is a source level debugger for linux kernel. It is used along
+ with gdb to debug a linux kernel. The expectation is that gdb can
+ be used to "break in" to the kernel to inspect memory, variables
+ and look through a cal stack information similar to what an
+ application developer would use gdb for. It is possible to place
+ breakpoints in kernel code and perform some limited execution
+ stepping.
+ </para>
+ <para>
+ Two machines are required for using kgdb. One of these machines is a
+ development machine and the other is a test machine. The kernel
+ to be debugged runs on the test machine. The development machine
+ runs an instance of gdb against the vmlinux file which contains
+ the symbols (not boot image such as bzImage, zImage, uImage...).
+ In gdb the developer specifies the connection parameters and
+ connects to kgdb. Depending on which kgdb I/O modules exist in
+ the kernel for a given architecture, it may be possible to debug
+ the test machine's kernel with the development machine using a
+ rs232 or ethernet connection.
+ </para>
+ </chapter>
+ <chapter id="CompilingAKernel">
+ <title>Compiling a kernel</title>
+ <para>
+ To enable <symbol>CONFIG_KGDB</symbol>, look under the "Kernel debugging"
+ and then select "KGDB: kernel debugging with remote gdb".
+ </para>
+ <para>
+ Next you should choose one of more I/O drivers to interconnect debugging
+ host and debugged target. Early boot debugging requires a KGDB
+ I/O driver that supports early debugging and the driver must be
+ built into the kernel directly. Kgdb I/O driver configuration
+ takes place via kernel or module parameters, see following
+ chapter.
+ </para>
+ <para>
+ The kgdb test compile options are described in the kgdb test suite chapter.
+ </para>
+
+ </chapter>
+ <chapter id="EnableKGDB">
+ <title>Enable kgdb for debugging</title>
+ <para>
+ In order to use kgdb you must activate it by passing configuration
+ information to one of the kgdb I/O drivers. If you do not pass any
+ configuration information kgdb will not do anything at all. Kgdb
+ will only actively hook up to the kernel trap hooks if a kgdb I/O
+ driver is loaded and configured. If you unconfigure a kgdb I/O
+ driver, kgdb will unregister all the kernel hook points.
+ </para>
+ <para>
+ All drivers can be reconfigured at run time, if
+ <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol>
+ are enabled, by echo'ing a new config string to
+ <constant>/sys/module/<driver>/parameter/<option></constant>.
+ The driver can be unconfigured by passing an empty string. You cannot
+ change the configuration while the debugger is attached. Make sure
+ to detach the debugger with the <constant>detach</constant> command
+ prior to trying unconfigure a kgdb I/O driver.
+ </para>
+ <sect1 id="kgdbwait">
+ <title>Kernel parameter: kgdbwait</title>
+ <para>
+ The Kernel command line option <constant>kgdbwait</constant> makes
+ kgdb wait for a debugger connection during booting of a kernel. You
+ can only use this option you compiled a kgdb I/O driver into the
+ kernel and you specified the I/O driver configuration as a kernel
+ command line option. The kgdbwait parameter should always follow the
+ configuration parameter for the kgdb I/O driver in the kernel
+ command line else the I/O driver will not be configured prior to
+ asking the kernel to use it to wait.
+ </para>
+ <para>
+ The kernel will stop and wait as early as the I/O driver and
+ architecture will allow when you use this option. If you build the
+ kgdb I/O driver as a kernel module kgdbwait will not do anything.
+ </para>
+ </sect1>
+ <sect1 id="kgdboc">
+ <title>Kernel parameter: kgdboc</title>
+ <para>
+ The kgdboc driver was originally an abbreviation meant to stand for
+ "kgdb over console". Kgdboc is designed to work with a single
+ serial port. It was meant to cover the circumstance
+ where you wanted to use a serial console as your primary console as
+ well as using it to perform kernel debugging. Of course you can
+ also use kgdboc without assigning a console to the same port.
+ </para>
+ <sect2 id="UsingKgdboc">
+ <title>Using kgdboc</title>
+ <para>
+ You can configure kgdboc via sysfs or a module or kernel boot line
+ parameter depending on if you build with CONFIG_KGDBOC as a module
+ or built-in.
+ <orderedlist>
+ <listitem><para>From the module load or build-in</para>
+ <para><constant>kgdboc=<tty-device>,[baud]</constant></para>
+ <para>
+ The example here would be if your console port was typically ttyS0, you would use something like <constant>kgdboc=ttyS0,115200</constant> or on the ARM Versatile AB you would likely use <constant>kgdboc=ttyAMA0,115200</constant>
+ </para>
+ </listitem>
+ <listitem><para>From sysfs</para>
+ <para><constant>echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc</constant></para>
+ </listitem>
+ </orderedlist>
+ </para>
+ <para>
+ NOTE: Kgdboc does not support interrupting the target via the
+ gdb remote protocol. You must manually send a sysrq-g unless you
+ have a proxy that splits console output to a terminal problem and
+ has a separate port for the debugger to connect to that sends the
+ sysrq-g for you.
+ </para>
+ <para>When using kgdboc with no debugger proxy, you can end up
+ connecting the debugger for one of two entry points. If an
+ exception occurs after you have loaded kgdboc a message should print
+ on the console stating it is waiting for the debugger. In case you
+ disconnect your terminal program and then connect the debugger in
+ its place. If you want to interrupt the target system and forcibly
+ enter a debug session you have to issue a Sysrq sequence and then
+ type the letter <constant>g</constant>. Then you disconnect the
+ terminal session and connect gdb. Your options if you don't like
+ this are to hack gdb to send the sysrq-g for you as well as on the
+ initial connect, or to use a debugger proxy that allows an
+ unmodified gdb to do the debugging.
+ </para>
+ </sect2>
+ </sect1>
+ <sect1 id="kgdbcon">
+ <title>Kernel parameter: kgdbcon</title>
+ <para>
+ Kgdb supports using the gdb serial protocol to send console messages
+ to the debugger when the debugger is connected and running. There
+ are two ways to activate this feature.
+ <orderedlist>
+ <listitem><para>Activate with the kernel command line option:</para>
+ <para><constant>kgdbcon</constant></para>
+ </listitem>
+ <listitem><para>Use sysfs before configuring an io driver</para>
+ <para>
+ <constant>echo 1 > /sys/module/kgdb/parameters/kgdb_use_con</constant>
+ </para>
+ <para>
+ NOTE: If you do this after you configure the kgdb I/O driver, the
+ setting will not take effect until the next point the I/O is
+ reconfigured.
+ </para>
+ </listitem>
+ </orderedlist>
+ </para>
+ <para>
+ IMPORTANT NOTE: Using this option with kgdb over the console
+ (kgdboc) or kgdb over ethernet (kgdboe) is not supported.
+ </para>
+ </sect1>
+ </chapter>
+ <chapter id="ConnectingGDB">
+ <title>Connecting gdb</title>
+ <para>
+ If you are using kgdboc, you need to have used kgdbwait as a boot
+ argument, issued a sysrq-g, or the system you are going to debug
+ has already taken an exception and is waiting for the debugger to
+ attach before you can connect gdb.
+ </para>
+ <para>
+ If you are not using different kgdb I/O driver other than kgdboc,
+ you should be able to connect and the target will automatically
+ respond.
+ </para>
+ <para>
+ Example (using a serial port):
+ </para>
+ <programlisting>
+ % gdb ./vmlinux
+ (gdb) set remotebaud 115200
+ (gdb) target remote /dev/ttyS0
+ </programlisting>
+ <para>
+ Example (kgdb to a terminal server):
+ </para>
+ <programlisting>
+ % gdb ./vmlinux
+ (gdb) target remote udp:192.168.2.2:6443
+ </programlisting>
+ <para>
+ Example (kgdb over ethernet):
+ </para>
+ <programlisting>
+ % gdb ./vmlinux
+ (gdb) target remote udp:192.168.2.2:6443
+ </programlisting>
+ <para>
+ Once connected, you can debug a kernel the way you would debug an
+ application program.
+ </para>
+ <para>
+ If you are having problems connecting or something is going
+ seriously wrong while debugging, it will most often be the case
+ that you want to enable gdb to be verbose about its target
+ communications. You do this prior to issuing the <constant>target
+ remote</constant> command by typing in: <constant>set remote debug 1</constant>
+ </para>
+ </chapter>
+ <chapter id="KGDBTestSuite">
+ <title>kgdb Test Suite</title>
+ <para>
+ When kgdb is enabled in the kernel config you can also elect to
+ enable the config parameter KGDB_TESTS. Turning this on will
+ enable a special kgdb I/O module which is designed to test the
+ kgdb internal functions.
+ </para>
+ <para>
+ The kgdb tests are mainly intended for developers to test the kgdb
+ internals as well as a tool for developing a new kgdb architecture
+ specific implementation. These tests are not really for end users
+ of the Linux kernel. The primary source of documentation would be
+ to look in the drivers/misc/kgdbts.c file.
+ </para>
+ <para>
+ The kgdb test suite can also be configured at compile time to run
+ the core set of tests by setting the kernel config parameter
+ KGDB_TESTS_ON_BOOT. This particular option is aimed at automated
+ regression testing and does not require modifying the kernel boot
+ config arguments. If this is turned on, the kgdb test suite can
+ be disabled by specifying "kgdbts=" as a kernel boot argument.
+ </para>
+ </chapter>
+ <chapter id="CommonBackEndReq">
+ <title>KGDB Internals</title>
+ <sect1 id="kgdbArchitecture">
+ <title>Architecture Specifics</title>
+ <para>
+ Kgdb is organized into three basic components:
+ <orderedlist>
+ <listitem><para>kgdb core</para>
+ <para>
+ The kgdb core is found in kernel/kgdb.c. It contains:
+ <itemizedlist>
+ <listitem><para>All the logic to implement the gdb serial protocol</para></listitem>
+ <listitem><para>A generic OS exception handler which includes sync'ing the processors into a stopped state on an multi cpu system.</para></listitem>
+ <listitem><para>The API to talk to the kgdb I/O drivers</para></listitem>
+ <listitem><para>The API to make calls to the arch specific kgdb implementation</para></listitem>
+ <listitem><para>The logic to perform safe memory reads and writes to memory while using the debugger</para></listitem>
+ <listitem><para>A full implementation for software breakpoints unless overridden by the arch</para></listitem>
+ </itemizedlist>
+ </para>
+ </listitem>
+ <listitem><para>kgdb arch specific implementation</para>
+ <para>
+ This implementation is generally found in arch/*/kernel/kgdb.c.
+ As an example, arch/x86/kernel/kgdb.c contains the specifics to
+ implement HW breakpoint as well as the initialization to
+ dynamically register and unregister for the trap handlers on
+ this architecture. The arch specific portion implements:
+ <itemizedlist>
+ <listitem><para>contains an arch specific trap catcher which
+ invokes kgdb_handle_exception() to start kgdb about doing its
+ work</para></listitem>
+ <listitem><para>translation to and from gdb specific packet format to pt_regs</para></listitem>
+ <listitem><para>Registration and unregistration of architecture specific trap hooks</para></listitem>
+ <listitem><para>Any special exception handling and cleanup</para></listitem>
+ <listitem><para>NMI exception handling and cleanup</para></listitem>
+ <listitem><para>(optional)HW breakpoints</para></listitem>
+ </itemizedlist>
+ </para>
+ </listitem>
+ <listitem><para>kgdb I/O driver</para>
+ <para>
+ Each kgdb I/O driver has to provide an implemenation for the following:
+ <itemizedlist>
+ <listitem><para>configuration via builtin or module</para></listitem>
+ <listitem><para>dynamic configuration and kgdb hook registration calls</para></listitem>
+ <listitem><para>read and write character interface</para></listitem>
+ <listitem><para>A cleanup handler for unconfiguring from the kgdb core</para></listitem>
+ <listitem><para>(optional) Early debug methodology</para></listitem>
+ </itemizedlist>
+ Any given kgdb I/O driver has to operate very closely with the
+ hardware and must do it in such a way that does not enable
+ interrupts or change other parts of the system context without
+ completely restoring them. The kgdb core will repeatedly "poll"
+ a kgdb I/O driver for characters when it needs input. The I/O
+ driver is expected to return immediately if there is no data
+ available. Doing so allows for the future possibility to touch
+ watch dog hardware in such a way as to have a target system not
+ reset when these are enabled.
+ </para>
+ </listitem>
+ </orderedlist>
+ </para>
+ <para>
+ If you are intent on adding kgdb architecture specific support
+ for a new architecture, the architecture should define
+ <constant>HAVE_ARCH_KGDB</constant> in the architecture specific
+ Kconfig file. This will enable kgdb for the architecture, and
+ at that point you must create an architecture specific kgdb
+ implementation.
+ </para>
+ <para>
+ There are a few flags which must be set on every architecture in
+ their <asm/kgdb.h> file. These are:
+ <itemizedlist>
+ <listitem>
+ <para>
+ NUMREGBYTES: The size in bytes of all of the registers, so
+ that we can ensure they will all fit into a packet.
+ </para>
+ <para>
+ BUFMAX: The size in bytes of the buffer GDB will read into.
+ This must be larger than NUMREGBYTES.
+ </para>
+ <para>
+ CACHE_FLUSH_IS_SAFE: Set to 1 if it is always safe to call
+ flush_cache_range or flush_icache_range. On some architectures,
+ these functions may not be safe to call on SMP since we keep other
+ CPUs in a holding pattern.
+ </para>
+ </listitem>
+ </itemizedlist>
+ </para>
+ <para>
+ There are also the following functions for the common backend,
+ found in kernel/kgdb.c, that must be supplied by the
+ architecture-specific backend unless marked as (optional), in
+ which case a default function maybe used if the architecture
+ does not need to provide a specific implementation.
+ </para>
+!Iinclude/linux/kgdb.h
+ </sect1>
+ <sect1 id="kgdbocDesign">
+ <title>kgdboc internals</title>
+ <para>
+ The kgdboc driver is actually a very thin driver that relies on the
+ underlying low level to the hardware driver having "polling hooks"
+ which the to which the tty driver is attached. In the initial
+ implementation of kgdboc it the serial_core was changed to expose a
+ low level uart hook for doing polled mode reading and writing of a
+ single character while in an atomic context. When kgdb makes an I/O
+ request to the debugger, kgdboc invokes a call back in the serial
+ core which in turn uses the call back in the uart driver. It is
+ certainly possible to extend kgdboc to work with non-uart based
+ consoles in the future.
+ </para>
+ <para>
+ When using kgdboc with a uart, the uart driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting>
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = serial8250_get_poll_char,
+ .poll_put_char = serial8250_put_poll_char,
+#endif
+ </programlisting>
+ Any implementation specifics around creating a polling driver use the
+ <constant>#ifdef CONFIG_CONSOLE_POLL</constant>, as shown above.
+ Keep in mind that polling hooks have to be implemented in such a way
+ that they can be called from an atomic context and have to restore
+ the state of the uart chip on return such that the system can return
+ to normal when the debugger detaches. You need to be very careful
+ with any kind of lock you consider, because failing here is most
+ going to mean pressing the reset button.
+ </para>
+ </sect1>
+ </chapter>
+ <chapter id="credits">
+ <title>Credits</title>
+ <para>
+ The following people have contributed to this document:
+ <orderedlist>
+ <listitem><para>Amit Kale<email>amitkale@linsyssoft.com</email></para></listitem>
+ <listitem><para>Tom Rini<email>trini@kernel.crashing.org</email></para></listitem>
+ </orderedlist>
+ In March 2008 this document was completely rewritten by:
+ <itemizedlist>
+ <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem>
+ </itemizedlist>
+ </para>
+ </chapter>
+</book>
+
kstack=N [X86-32,X86-64] Print N words from the kernel stack
in oops dumps.
+ kgdboc= [HW] kgdb over consoles.
+ Requires a tty driver that supports console polling.
+ (only serial suported for now)
+ Format: <serial_device>[,baud]
+
l2cr= [PPC]
lapic [X86-32,APIC] Enable the local APIC even if BIOS
L: kexec@lists.infradead.org
S: Maintained
+KGDB
+P: Jason Wessel
+M: jason.wessel@windriver.com
+L: kgdb-bugreport@lists.sourceforge.net
+S: Maintained
+
KPROBES
P: Ananth N Mavinakayanahalli
M: ananth@in.ibm.com
select HAVE_KPROBES
select HAVE_KRETPROBES
select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
+ select HAVE_ARCH_KGDB
config GENERIC_LOCKBREAK
obj-$(CONFIG_ACPI_SRAT) += srat_32.o
obj-$(CONFIG_EFI) += efi.o efi_$(BITS).o efi_stub_$(BITS).o
obj-$(CONFIG_DOUBLEFAULT) += doublefault_32.o
+obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_VM86) += vm86_32.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
--- /dev/null
+/*
+ * 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@linsyssoft.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 MontaVista Software, Inc.
+ * Copyright (C) 2007-2008 Jason Wessel, Wind River Systems, Inc.
+ */
+/****************************************************************************
+ * Contributor: Lake Stevens Instrument Division$
+ * Written by: Glenn Engel $
+ * Updated by: Amit Kale<akale@veritas.com>
+ * Updated by: Tom Rini <trini@kernel.crashing.org>
+ * Updated by: Jason Wessel <jason.wessel@windriver.com>
+ * Modified for 386 by Jim Kingdon, Cygnus Support.
+ * Origianl kgdb, compatibility with 2.1.xx kernel by
+ * David Grothe <dave@gcom.com>
+ * Integrated into 2.2.5 kernel by Tigran Aivazian <tigran@sco.com>
+ * X86_64 changes from Andi Kleen's patch merged by Jim Houston
+ */
+#include <linux/spinlock.h>
+#include <linux/kdebug.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/kgdb.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/nmi.h>
+
+#include <asm/apicdef.h>
+#include <asm/system.h>
+
+#ifdef CONFIG_X86_32
+# include <mach_ipi.h>
+#else
+# include <asm/mach_apic.h>
+#endif
+
+/*
+ * Put the error code here just in case the user cares:
+ */
+static int gdb_x86errcode;
+
+/*
+ * Likewise, the vector number here (since GDB only gets the signal
+ * number through the usual means, and that's not very specific):
+ */
+static int gdb_x86vector = -1;
+
+/**
+ * pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs
+ * @gdb_regs: A pointer to hold the registers in the order GDB wants.
+ * @regs: The &struct pt_regs of the current process.
+ *
+ * Convert the pt_regs in @regs into the format for registers that
+ * GDB expects, stored in @gdb_regs.
+ */
+void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ gdb_regs[GDB_AX] = regs->ax;
+ gdb_regs[GDB_BX] = regs->bx;
+ gdb_regs[GDB_CX] = regs->cx;
+ gdb_regs[GDB_DX] = regs->dx;
+ gdb_regs[GDB_SI] = regs->si;
+ gdb_regs[GDB_DI] = regs->di;
+ gdb_regs[GDB_BP] = regs->bp;
+ gdb_regs[GDB_PS] = regs->flags;
+ gdb_regs[GDB_PC] = regs->ip;
+#ifdef CONFIG_X86_32
+ gdb_regs[GDB_DS] = regs->ds;
+ gdb_regs[GDB_ES] = regs->es;
+ gdb_regs[GDB_CS] = regs->cs;
+ gdb_regs[GDB_SS] = __KERNEL_DS;
+ gdb_regs[GDB_FS] = 0xFFFF;
+ gdb_regs[GDB_GS] = 0xFFFF;
+#else
+ gdb_regs[GDB_R8] = regs->r8;
+ gdb_regs[GDB_R9] = regs->r9;
+ gdb_regs[GDB_R10] = regs->r10;
+ gdb_regs[GDB_R11] = regs->r11;
+ gdb_regs[GDB_R12] = regs->r12;
+ gdb_regs[GDB_R13] = regs->r13;
+ gdb_regs[GDB_R14] = regs->r14;
+ gdb_regs[GDB_R15] = regs->r15;
+#endif
+ gdb_regs[GDB_SP] = regs->sp;
+}
+
+/**
+ * sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs
+ * @gdb_regs: A pointer to hold the registers in the order GDB wants.
+ * @p: The &struct task_struct of the desired process.
+ *
+ * Convert the register values of the sleeping process in @p to
+ * the format that GDB expects.
+ * This function is called when kgdb does not have access to the
+ * &struct pt_regs and therefore it should fill the gdb registers
+ * @gdb_regs with what has been saved in &struct thread_struct
+ * thread field during switch_to.
+ */
+void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
+{
+ gdb_regs[GDB_AX] = 0;
+ gdb_regs[GDB_BX] = 0;
+ gdb_regs[GDB_CX] = 0;
+ gdb_regs[GDB_DX] = 0;
+ gdb_regs[GDB_SI] = 0;
+ gdb_regs[GDB_DI] = 0;
+ gdb_regs[GDB_BP] = *(unsigned long *)p->thread.sp;
+#ifdef CONFIG_X86_32
+ gdb_regs[GDB_DS] = __KERNEL_DS;
+ gdb_regs[GDB_ES] = __KERNEL_DS;
+ gdb_regs[GDB_PS] = 0;
+ gdb_regs[GDB_CS] = __KERNEL_CS;
+ gdb_regs[GDB_PC] = p->thread.ip;
+ gdb_regs[GDB_SS] = __KERNEL_DS;
+ gdb_regs[GDB_FS] = 0xFFFF;
+ gdb_regs[GDB_GS] = 0xFFFF;
+#else
+ gdb_regs[GDB_PS] = *(unsigned long *)(p->thread.sp + 8);
+ gdb_regs[GDB_PC] = 0;
+ gdb_regs[GDB_R8] = 0;
+ gdb_regs[GDB_R9] = 0;
+ gdb_regs[GDB_R10] = 0;
+ gdb_regs[GDB_R11] = 0;
+ gdb_regs[GDB_R12] = 0;
+ gdb_regs[GDB_R13] = 0;
+ gdb_regs[GDB_R14] = 0;
+ gdb_regs[GDB_R15] = 0;
+#endif
+ gdb_regs[GDB_SP] = p->thread.sp;
+}
+
+/**
+ * gdb_regs_to_pt_regs - Convert GDB regs to ptrace regs.
+ * @gdb_regs: A pointer to hold the registers we've received from GDB.
+ * @regs: A pointer to a &struct pt_regs to hold these values in.
+ *
+ * Convert the GDB regs in @gdb_regs into the pt_regs, and store them
+ * in @regs.
+ */
+void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+{
+ regs->ax = gdb_regs[GDB_AX];
+ regs->bx = gdb_regs[GDB_BX];
+ regs->cx = gdb_regs[GDB_CX];
+ regs->dx = gdb_regs[GDB_DX];
+ regs->si = gdb_regs[GDB_SI];
+ regs->di = gdb_regs[GDB_DI];
+ regs->bp = gdb_regs[GDB_BP];
+ regs->flags = gdb_regs[GDB_PS];
+ regs->ip = gdb_regs[GDB_PC];
+#ifdef CONFIG_X86_32
+ regs->ds = gdb_regs[GDB_DS];
+ regs->es = gdb_regs[GDB_ES];
+ regs->cs = gdb_regs[GDB_CS];
+#else
+ regs->r8 = gdb_regs[GDB_R8];
+ regs->r9 = gdb_regs[GDB_R9];
+ regs->r10 = gdb_regs[GDB_R10];
+ regs->r11 = gdb_regs[GDB_R11];
+ regs->r12 = gdb_regs[GDB_R12];
+ regs->r13 = gdb_regs[GDB_R13];
+ regs->r14 = gdb_regs[GDB_R14];
+ regs->r15 = gdb_regs[GDB_R15];
+#endif
+}
+
+static struct hw_breakpoint {
+ unsigned enabled;
+ unsigned type;
+ unsigned len;
+ unsigned long addr;
+} breakinfo[4];
+
+static void kgdb_correct_hw_break(void)
+{
+ unsigned long dr7;
+ int correctit = 0;
+ int breakbit;
+ int breakno;
+
+ 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);
+ if (breakno >= 0 && breakno <= 3)
+ set_debugreg(breakinfo[breakno].addr, breakno);
+
+ } 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)
+{
+ unsigned type;
+ int i;
+
+ 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;
+}
+
+/**
+ * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
+ * @regs: Current &struct pt_regs.
+ *
+ * This function will be called if the particular architecture must
+ * disable hardware debugging while it is processing gdb packets or
+ * handling exception.
+ */
+void kgdb_disable_hw_debug(struct pt_regs *regs)
+{
+ /* Disable hardware debugging while we are in kgdb: */
+ set_debugreg(0UL, 7);
+}
+
+/**
+ * kgdb_post_primary_code - Save error vector/code numbers.
+ * @regs: Original pt_regs.
+ * @e_vector: Original error vector.
+ * @err_code: Original error code.
+ *
+ * This is needed on architectures which support SMP and KGDB.
+ * This function is called after all the slave cpus have been put
+ * to a know spin state and the primary CPU has control over KGDB.
+ */
+void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
+{
+ /* primary processor is completely in the debugger */
+ gdb_x86vector = e_vector;
+ gdb_x86errcode = err_code;
+}
+
+#ifdef CONFIG_SMP
+/**
+ * kgdb_roundup_cpus - Get other CPUs into a holding pattern
+ * @flags: Current IRQ state
+ *
+ * On SMP systems, we need to get the attention of the other CPUs
+ * and get them be in a known state. This should do what is needed
+ * to get the other CPUs to call kgdb_wait(). Note that on some arches,
+ * the NMI approach is not used for rounding up all the CPUs. For example,
+ * in case of MIPS, smp_call_function() is used to roundup CPUs. In
+ * this case, we have to make sure that interrupts are enabled before
+ * calling smp_call_function(). The argument to this function is
+ * the flags that will be used when restoring the interrupts. There is
+ * local_irq_save() call before kgdb_roundup_cpus().
+ *
+ * On non-SMP systems, this is not called.
+ */
+void kgdb_roundup_cpus(unsigned long flags)
+{
+ send_IPI_allbutself(APIC_DM_NMI);
+}
+#endif
+
+/**
+ * kgdb_arch_handle_exception - Handle architecture specific GDB packets.
+ * @vector: The error vector of the exception that happened.
+ * @signo: The signal number of the exception that happened.
+ * @err_code: The error code of the exception that happened.
+ * @remcom_in_buffer: The buffer of the packet we have read.
+ * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
+ * @regs: The &struct pt_regs of the current process.
+ *
+ * This function MUST handle the 'c' and 's' command packets,
+ * as well packets to set / remove a hardware breakpoint, if used.
+ * If there are additional packets which the hardware needs to handle,
+ * they are handled here. The code should return -1 if it wants to
+ * process more packets, and a %0 or %1 if it wants to exit from the
+ * kgdb callback.
+ */
+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;
+ unsigned long dr6;
+ char *ptr;
+ int newPC;
+
+ 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->ip = addr;
+ case 'D':
+ case 'k':
+ newPC = linux_regs->ip;
+
+ /* clear the trace bit */
+ linux_regs->flags &= ~TF_MASK;
+ atomic_set(&kgdb_cpu_doing_single_step, -1);
+
+ /* set the trace bit if we're stepping */
+ if (remcomInBuffer[0] == 's') {
+ linux_regs->flags |= TF_MASK;
+ kgdb_single_step = 1;
+ if (kgdb_contthread) {
+ atomic_set(&kgdb_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->flags |= 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 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 was_in_debug_nmi[NR_CPUS];
+
+static int __kgdb_notify(struct die_args *args, unsigned long cmd)
+{
+ struct pt_regs *regs = args->regs;
+
+ switch (cmd) {
+ case DIE_NMI:
+ if (atomic_read(&kgdb_active) != -1) {
+ /* KGDB CPU roundup */
+ kgdb_nmicallback(raw_smp_processor_id(), regs);
+ was_in_debug_nmi[raw_smp_processor_id()] = 1;
+ touch_nmi_watchdog();
+ return NOTIFY_STOP;
+ }
+ return NOTIFY_DONE;
+
+ case DIE_NMI_IPI:
+ if (atomic_read(&kgdb_active) != -1) {
+ /* KGDB CPU roundup */
+ kgdb_nmicallback(raw_smp_processor_id(), regs);
+ was_in_debug_nmi[raw_smp_processor_id()] = 1;
+ touch_nmi_watchdog();
+ }
+ return NOTIFY_DONE;
+
+ case DIE_NMIUNKNOWN:
+ if (was_in_debug_nmi[raw_smp_processor_id()]) {
+ was_in_debug_nmi[raw_smp_processor_id()] = 0;
+ return NOTIFY_STOP;
+ }
+ return NOTIFY_DONE;
+
+ case DIE_NMIWATCHDOG:
+ if (atomic_read(&kgdb_active) != -1) {
+ /* KGDB CPU roundup: */
+ kgdb_nmicallback(raw_smp_processor_id(), regs);
+ return NOTIFY_STOP;
+ }
+ /* Enter debugger: */
+ break;
+
+ case DIE_DEBUG:
+ if (atomic_read(&kgdb_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_handle_exception(args->trapnr, args->signr, args->err, regs))
+ return NOTIFY_DONE;
+
+ /* Must touch watchdog before return to normal operation */
+ touch_nmi_watchdog();
+ return NOTIFY_STOP;
+}
+
+static int
+kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
+{
+ unsigned long flags;
+ int ret;
+
+ local_irq_save(flags);
+ ret = __kgdb_notify(ptr, cmd);
+ local_irq_restore(flags);
+
+ return ret;
+}
+
+static struct notifier_block kgdb_notifier = {
+ .notifier_call = kgdb_notify,
+
+ /*
+ * Lowest-prio notifier priority, we want to be notified last:
+ */
+ .priority = -INT_MAX,
+};
+
+/**
+ * kgdb_arch_init - Perform any architecture specific initalization.
+ *
+ * This function will handle the initalization of any architecture
+ * specific callbacks.
+ */
+int kgdb_arch_init(void)
+{
+ return register_die_notifier(&kgdb_notifier);
+}
+
+/**
+ * kgdb_arch_exit - Perform any architecture specific uninitalization.
+ *
+ * This function will handle the uninitalization of any architecture
+ * specific callbacks, for dynamic registration and unregistration.
+ */
+void kgdb_arch_exit(void)
+{
+ unregister_die_notifier(&kgdb_notifier);
+}
+
+/**
+ *
+ * kgdb_skipexception - Bail out of KGDB when we've been triggered.
+ * @exception: Exception vector number
+ * @regs: Current &struct pt_regs.
+ *
+ * On some architectures we need to skip a breakpoint exception when
+ * it occurs after a breakpoint has been removed.
+ *
+ * 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->ip - 1)) {
+ regs->ip -= 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 = {
+ /* Breakpoint instruction: */
+ .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,
+};
#include <linux/bootmem.h>
#include <linux/bitops.h>
#include <linux/module.h>
+#include <linux/kgdb.h>
#include <asm/pda.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
load_TR_desc();
load_LDT(&init_mm.context);
+#ifdef CONFIG_KGDB
+ /*
+ * If the kgdb is connected no debug regs should be altered. This
+ * is only applicable when KGDB and a KGDB I/O module are built
+ * into the kernel and you are using early debugging with
+ * kgdbwait. KGDB will control the kernel HW breakpoint registers.
+ */
+ if (kgdb_connected && arch_kgdb_ops.correct_hw_break)
+ arch_kgdb_ops.correct_hw_break();
+ else {
+#endif
/*
* Clear all 6 debug registers:
*/
set_debugreg(0UL, 3);
set_debugreg(0UL, 6);
set_debugreg(0UL, 7);
+#ifdef CONFIG_KGDB
+ /* If the kgdb is connected no debug regs should be altered. */
+ }
+#endif
fpu_init();
static __kprobes void
unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
{
+ if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
+ return;
#ifdef CONFIG_MCA
/*
* Might actually be able to figure out what the guilty party
void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
{
- unsigned long flags = oops_begin();
+ unsigned long flags;
+ if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) ==
+ NOTIFY_STOP)
+ return;
+
+ flags = oops_begin();
/*
* We are in trouble anyway, lets at least try
* to get a message out.
static __kprobes void
unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
{
+ if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
+ return;
printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n",
reason);
printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n");
return NULL;
}
+#ifdef CONFIG_CONSOLE_POLL
+
+/**
+ * tty_find_polling_driver - find device of a polled tty
+ * @name: name string to match
+ * @line: pointer to resulting tty line nr
+ *
+ * This routine returns a tty driver structure, given a name
+ * and the condition that the tty driver is capable of polled
+ * operation.
+ */
+struct tty_driver *tty_find_polling_driver(char *name, int *line)
+{
+ struct tty_driver *p, *res = NULL;
+ int tty_line = 0;
+ char *str;
+
+ mutex_lock(&tty_mutex);
+ /* Search through the tty devices to look for a match */
+ list_for_each_entry(p, &tty_drivers, tty_drivers) {
+ str = name + strlen(p->name);
+ tty_line = simple_strtoul(str, &str, 10);
+ if (*str == ',')
+ str++;
+ if (*str == '\0')
+ str = 0;
+
+ if (tty_line >= 0 && tty_line <= p->num && p->poll_init &&
+ !p->poll_init(p, tty_line, str)) {
+
+ res = p;
+ *line = tty_line;
+ break;
+ }
+ }
+ mutex_unlock(&tty_mutex);
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(tty_find_polling_driver);
+#endif
+
/**
* tty_check_change - check for POSIX terminal changes
* @tty: tty to check
driver->write_proc = op->write_proc;
driver->tiocmget = op->tiocmget;
driver->tiocmset = op->tiocmset;
+#ifdef CONFIG_CONSOLE_POLL
+ driver->poll_init = op->poll_init;
+ driver->poll_get_char = op->poll_get_char;
+ driver->poll_put_char = op->poll_put_char;
+#endif
}
obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o
obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o
obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
+obj-$(CONFIG_KGDB_TESTS) += kgdbts.o
--- /dev/null
+/*
+ * kgdbts is a test suite for kgdb for the sole purpose of validating
+ * that key pieces of the kgdb internals are working properly such as
+ * HW/SW breakpoints, single stepping, and NMI.
+ *
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2008 Wind River Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+/* Information about the kgdb test suite.
+ * -------------------------------------
+ *
+ * The kgdb test suite is designed as a KGDB I/O module which
+ * simulates the communications that a debugger would have with kgdb.
+ * The tests are broken up in to a line by line and referenced here as
+ * a "get" which is kgdb requesting input and "put" which is kgdb
+ * sending a response.
+ *
+ * The kgdb suite can be invoked from the kernel command line
+ * arguments system or executed dynamically at run time. The test
+ * suite uses the variable "kgdbts" to obtain the information about
+ * which tests to run and to configure the verbosity level. The
+ * following are the various characters you can use with the kgdbts=
+ * line:
+ *
+ * When using the "kgdbts=" you only choose one of the following core
+ * test types:
+ * A = Run all the core tests silently
+ * V1 = Run all the core tests with minimal output
+ * V2 = Run all the core tests in debug mode
+ *
+ * You can also specify optional tests:
+ * N## = Go to sleep with interrupts of for ## seconds
+ * to test the HW NMI watchdog
+ * F## = Break at do_fork for ## iterations
+ * S## = Break at sys_open for ## iterations
+ *
+ * NOTE: that the do_fork and sys_open tests are mutually exclusive.
+ *
+ * To invoke the kgdb test suite from boot you use a kernel start
+ * argument as follows:
+ * kgdbts=V1 kgdbwait
+ * Or if you wanted to perform the NMI test for 6 seconds and do_fork
+ * test for 100 forks, you could use:
+ * kgdbts=V1N6F100 kgdbwait
+ *
+ * The test suite can also be invoked at run time with:
+ * echo kgdbts=V1N6F100 > /sys/module/kgdbts/parameters/kgdbts
+ * Or as another example:
+ * echo kgdbts=V2 > /sys/module/kgdbts/parameters/kgdbts
+ *
+ * When developing a new kgdb arch specific implementation or
+ * using these tests for the purpose of regression testing,
+ * several invocations are required.
+ *
+ * 1) Boot with the test suite enabled by using the kernel arguments
+ * "kgdbts=V1F100 kgdbwait"
+ * ## If kgdb arch specific implementation has NMI use
+ * "kgdbts=V1N6F100
+ *
+ * 2) After the system boot run the basic test.
+ * echo kgdbts=V1 > /sys/module/kgdbts/parameters/kgdbts
+ *
+ * 3) Run the concurrency tests. It is best to use n+1
+ * while loops where n is the number of cpus you have
+ * in your system. The example below uses only two
+ * loops.
+ *
+ * ## This tests break points on sys_open
+ * while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
+ * while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
+ * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
+ * fg # and hit control-c
+ * fg # and hit control-c
+ * ## This tests break points on do_fork
+ * while [ 1 ] ; do date > /dev/null ; done &
+ * while [ 1 ] ; do date > /dev/null ; done &
+ * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
+ * fg # and hit control-c
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/kgdb.h>
+#include <linux/ctype.h>
+#include <linux/uaccess.h>
+#include <linux/syscalls.h>
+#include <linux/nmi.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+
+#define v1printk(a...) do { \
+ if (verbose) \
+ printk(KERN_INFO a); \
+ } while (0)
+#define v2printk(a...) do { \
+ if (verbose > 1) \
+ printk(KERN_INFO a); \
+ touch_nmi_watchdog(); \
+ } while (0)
+#define eprintk(a...) do { \
+ printk(KERN_ERR a); \
+ WARN_ON(1); \
+ } while (0)
+#define MAX_CONFIG_LEN 40
+
+static const char hexchars[] = "0123456789abcdef";
+static struct kgdb_io kgdbts_io_ops;
+static char get_buf[BUFMAX];
+static int get_buf_cnt;
+static char put_buf[BUFMAX];
+static int put_buf_cnt;
+static char scratch_buf[BUFMAX];
+static int verbose;
+static int repeat_test;
+static int test_complete;
+static int send_ack;
+static int final_ack;
+static int hw_break_val;
+static int hw_break_val2;
+#if defined(CONFIG_ARM) || defined(CONFIG_MIPS)
+static int arch_needs_sstep_emulation = 1;
+#else
+static int arch_needs_sstep_emulation;
+#endif
+static unsigned long sstep_addr;
+static int sstep_state;
+
+/* Storage for the registers, in GDB format. */
+static unsigned long kgdbts_gdb_regs[(NUMREGBYTES +
+ sizeof(unsigned long) - 1) /
+ sizeof(unsigned long)];
+static struct pt_regs kgdbts_regs;
+
+/* -1 = init not run yet, 0 = unconfigured, 1 = configured. */
+static int configured = -1;
+
+#ifdef CONFIG_KGDB_TESTS_BOOT_STRING
+static char config[MAX_CONFIG_LEN] = CONFIG_KGDB_TESTS_BOOT_STRING;
+#else
+static char config[MAX_CONFIG_LEN];
+#endif
+static struct kparam_string kps = {
+ .string = config,
+ .maxlen = MAX_CONFIG_LEN,
+};
+
+static void fill_get_buf(char *buf);
+
+struct test_struct {
+ char *get;
+ char *put;
+ void (*get_handler)(char *);
+ int (*put_handler)(char *, char *);
+};
+
+struct test_state {
+ char *name;
+ struct test_struct *tst;
+ int idx;
+ int (*run_test) (int, int);
+ int (*validate_put) (char *);
+};
+
+static struct test_state ts;
+
+static int kgdbts_unreg_thread(void *ptr)
+{
+ /* Wait until the tests are complete and then ungresiter the I/O
+ * driver.
+ */
+ while (!final_ack)
+ msleep_interruptible(1500);
+
+ if (configured)
+ kgdb_unregister_io_module(&kgdbts_io_ops);
+ configured = 0;
+
+ return 0;
+}
+
+/* This is noinline such that it can be used for a single location to
+ * place a breakpoint
+ */
+static noinline void kgdbts_break_test(void)
+{
+ v2printk("kgdbts: breakpoint complete\n");
+}
+
+/* Lookup symbol info in the kernel */
+static unsigned long lookup_addr(char *arg)
+{
+ unsigned long addr = 0;
+
+ if (!strcmp(arg, "kgdbts_break_test"))
+ addr = (unsigned long)kgdbts_break_test;
+ else if (!strcmp(arg, "sys_open"))
+ addr = (unsigned long)sys_open;
+ else if (!strcmp(arg, "do_fork"))
+ addr = (unsigned long)do_fork;
+ else if (!strcmp(arg, "hw_break_val"))
+ addr = (unsigned long)&hw_break_val;
+ return addr;
+}
+
+static void break_helper(char *bp_type, char *arg, unsigned long vaddr)
+{
+ unsigned long addr;
+
+ if (arg)
+ addr = lookup_addr(arg);
+ else
+ addr = vaddr;
+
+ sprintf(scratch_buf, "%s,%lx,%i", bp_type, addr,
+ BREAK_INSTR_SIZE);
+ fill_get_buf(scratch_buf);
+}
+
+static void sw_break(char *arg)
+{
+ break_helper("Z0", arg, 0);
+}
+
+static void sw_rem_break(char *arg)
+{
+ break_helper("z0", arg, 0);
+}
+
+static void hw_break(char *arg)
+{
+ break_helper("Z1", arg, 0);
+}
+
+static void hw_rem_break(char *arg)
+{
+ break_helper("z1", arg, 0);
+}
+
+static void hw_write_break(char *arg)
+{
+ break_helper("Z2", arg, 0);
+}
+
+static void hw_rem_write_break(char *arg)
+{
+ break_helper("z2", arg, 0);
+}
+
+static void hw_access_break(char *arg)
+{
+ break_helper("Z4", arg, 0);
+}
+
+static void hw_rem_access_break(char *arg)
+{
+ break_helper("z4", arg, 0);
+}
+
+static void hw_break_val_access(void)
+{
+ hw_break_val2 = hw_break_val;
+}
+
+static void hw_break_val_write(void)
+{
+ hw_break_val++;
+}
+
+static int check_and_rewind_pc(char *put_str, char *arg)
+{
+ unsigned long addr = lookup_addr(arg);
+ int offset = 0;
+
+ kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
+ NUMREGBYTES);
+ gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
+ v2printk("Stopped at IP: %lx\n", instruction_pointer(&kgdbts_regs));
+#ifdef CONFIG_X86
+ /* On x86 a breakpoint stop requires it to be decremented */
+ if (addr + 1 == kgdbts_regs.ip)
+ offset = -1;
+#endif
+ if (strcmp(arg, "silent") &&
+ instruction_pointer(&kgdbts_regs) + offset != addr) {
+ eprintk("kgdbts: BP mismatch %lx expected %lx\n",
+ instruction_pointer(&kgdbts_regs) + offset, addr);
+ return 1;
+ }
+#ifdef CONFIG_X86
+ /* On x86 adjust the instruction pointer if needed */
+ kgdbts_regs.ip += offset;
+#endif
+ return 0;
+}
+
+static int check_single_step(char *put_str, char *arg)
+{
+ unsigned long addr = lookup_addr(arg);
+ /*
+ * From an arch indepent point of view the instruction pointer
+ * should be on a different instruction
+ */
+ kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
+ NUMREGBYTES);
+ gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
+ v2printk("Singlestep stopped at IP: %lx\n",
+ instruction_pointer(&kgdbts_regs));
+ if (instruction_pointer(&kgdbts_regs) == addr) {
+ eprintk("kgdbts: SingleStep failed at %lx\n",
+ instruction_pointer(&kgdbts_regs));
+ return 1;
+ }
+
+ return 0;
+}
+
+static void write_regs(char *arg)
+{
+ memset(scratch_buf, 0, sizeof(scratch_buf));
+ scratch_buf[0] = 'G';
+ pt_regs_to_gdb_regs(kgdbts_gdb_regs, &kgdbts_regs);
+ kgdb_mem2hex((char *)kgdbts_gdb_regs, &scratch_buf[1], NUMREGBYTES);
+ fill_get_buf(scratch_buf);
+}
+
+static void skip_back_repeat_test(char *arg)
+{
+ int go_back = simple_strtol(arg, NULL, 10);
+
+ repeat_test--;
+ if (repeat_test <= 0)
+ ts.idx++;
+ else
+ ts.idx -= go_back;
+ fill_get_buf(ts.tst[ts.idx].get);
+}
+
+static int got_break(char *put_str, char *arg)
+{
+ test_complete = 1;
+ if (!strncmp(put_str+1, arg, 2)) {
+ if (!strncmp(arg, "T0", 2))
+ test_complete = 2;
+ return 0;
+ }
+ return 1;
+}
+
+static void emul_sstep_get(char *arg)
+{
+ if (!arch_needs_sstep_emulation) {
+ fill_get_buf(arg);
+ return;
+ }
+ switch (sstep_state) {
+ case 0:
+ v2printk("Emulate single step\n");
+ /* Start by looking at the current PC */
+ fill_get_buf("g");
+ break;
+ case 1:
+ /* set breakpoint */
+ break_helper("Z0", 0, sstep_addr);
+ break;
+ case 2:
+ /* Continue */
+ fill_get_buf("c");
+ break;
+ case 3:
+ /* Clear breakpoint */
+ break_helper("z0", 0, sstep_addr);
+ break;
+ default:
+ eprintk("kgdbts: ERROR failed sstep get emulation\n");
+ }
+ sstep_state++;
+}
+
+static int emul_sstep_put(char *put_str, char *arg)
+{
+ if (!arch_needs_sstep_emulation) {
+ if (!strncmp(put_str+1, arg, 2))
+ return 0;
+ return 1;
+ }
+ switch (sstep_state) {
+ case 1:
+ /* validate the "g" packet to get the IP */
+ kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
+ NUMREGBYTES);
+ gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
+ v2printk("Stopped at IP: %lx\n",
+ instruction_pointer(&kgdbts_regs));
+ /* Want to stop at IP + break instruction size by default */
+ sstep_addr = instruction_pointer(&kgdbts_regs) +
+ BREAK_INSTR_SIZE;
+ break;
+ case 2:
+ if (strncmp(put_str, "$OK", 3)) {
+ eprintk("kgdbts: failed sstep break set\n");
+ return 1;
+ }
+ break;
+ case 3:
+ if (strncmp(put_str, "$T0", 3)) {
+ eprintk("kgdbts: failed continue sstep\n");
+ return 1;
+ }
+ break;
+ case 4:
+ if (strncmp(put_str, "$OK", 3)) {
+ eprintk("kgdbts: failed sstep break unset\n");
+ return 1;
+ }
+ /* Single step is complete so continue on! */
+ sstep_state = 0;
+ return 0;
+ default:
+ eprintk("kgdbts: ERROR failed sstep put emulation\n");
+ }
+
+ /* Continue on the same test line until emulation is complete */
+ ts.idx--;
+ return 0;
+}
+
+static int final_ack_set(char *put_str, char *arg)
+{
+ if (strncmp(put_str+1, arg, 2))
+ return 1;
+ final_ack = 1;
+ return 0;
+}
+/*
+ * Test to plant a breakpoint and detach, which should clear out the
+ * breakpoint and restore the original instruction.
+ */
+static struct test_struct plant_and_detach_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
+ { "D", "OK" }, /* Detach */
+ { "", "" },
+};
+
+/*
+ * Simple test to write in a software breakpoint, check for the
+ * correct stop location and detach.
+ */
+static struct test_struct sw_breakpoint_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "kgdbts_break_test", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs },
+ { "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
+ { "D", "OK" }, /* Detach */
+ { "D", "OK", 0, got_break }, /* If the test worked we made it here */
+ { "", "" },
+};
+
+/*
+ * Test a known bad memory read location to test the fault handler and
+ * read bytes 1-8 at the bad address
+ */
+static struct test_struct bad_read_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "m0,1", "E*" }, /* read 1 byte at address 1 */
+ { "m0,2", "E*" }, /* read 1 byte at address 2 */
+ { "m0,3", "E*" }, /* read 1 byte at address 3 */
+ { "m0,4", "E*" }, /* read 1 byte at address 4 */
+ { "m0,5", "E*" }, /* read 1 byte at address 5 */
+ { "m0,6", "E*" }, /* read 1 byte at address 6 */
+ { "m0,7", "E*" }, /* read 1 byte at address 7 */
+ { "m0,8", "E*" }, /* read 1 byte at address 8 */
+ { "D", "OK" }, /* Detach which removes all breakpoints and continues */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a breakpoint, remove it, single step, plant it
+ * again and detach.
+ */
+static struct test_struct singlestep_break_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "kgdbts_break_test", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs }, /* Write registers */
+ { "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
+ { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
+ { "g", "kgdbts_break_test", 0, check_single_step },
+ { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "kgdbts_break_test", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs }, /* Write registers */
+ { "D", "OK" }, /* Remove all breakpoints and continues */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a breakpoint at do_fork for what ever the number
+ * of iterations required by the variable repeat_test.
+ */
+static struct test_struct do_fork_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "do_fork", 0, check_and_rewind_pc }, /* check location */
+ { "write", "OK", write_regs }, /* Write registers */
+ { "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
+ { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
+ { "g", "do_fork", 0, check_single_step },
+ { "do_fork", "OK", sw_break, }, /* set sw breakpoint */
+ { "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
+ { "D", "OK", 0, final_ack_set }, /* detach and unregister I/O */
+ { "", "" },
+};
+
+/* Test for hitting a breakpoint at sys_open for what ever the number
+ * of iterations required by the variable repeat_test.
+ */
+static struct test_struct sys_open_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "sys_open", "OK", sw_break, }, /* set sw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "sys_open", 0, check_and_rewind_pc }, /* check location */
+ { "write", "OK", write_regs }, /* Write registers */
+ { "sys_open", "OK", sw_rem_break }, /*remove breakpoint */
+ { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
+ { "g", "sys_open", 0, check_single_step },
+ { "sys_open", "OK", sw_break, }, /* set sw breakpoint */
+ { "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
+ { "D", "OK", 0, final_ack_set }, /* detach and unregister I/O */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a simple hw breakpoint
+ */
+static struct test_struct hw_breakpoint_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "kgdbts_break_test", "OK", hw_break, }, /* set hw breakpoint */
+ { "c", "T0*", }, /* Continue */
+ { "g", "kgdbts_break_test", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs },
+ { "kgdbts_break_test", "OK", hw_rem_break }, /*remove breakpoint */
+ { "D", "OK" }, /* Detach */
+ { "D", "OK", 0, got_break }, /* If the test worked we made it here */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a hw write breakpoint
+ */
+static struct test_struct hw_write_break_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "hw_break_val", "OK", hw_write_break, }, /* set hw breakpoint */
+ { "c", "T0*", 0, got_break }, /* Continue */
+ { "g", "silent", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs },
+ { "hw_break_val", "OK", hw_rem_write_break }, /*remove breakpoint */
+ { "D", "OK" }, /* Detach */
+ { "D", "OK", 0, got_break }, /* If the test worked we made it here */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a hw access breakpoint
+ */
+static struct test_struct hw_access_break_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "hw_break_val", "OK", hw_access_break, }, /* set hw breakpoint */
+ { "c", "T0*", 0, got_break }, /* Continue */
+ { "g", "silent", 0, check_and_rewind_pc },
+ { "write", "OK", write_regs },
+ { "hw_break_val", "OK", hw_rem_access_break }, /*remove breakpoint */
+ { "D", "OK" }, /* Detach */
+ { "D", "OK", 0, got_break }, /* If the test worked we made it here */
+ { "", "" },
+};
+
+/*
+ * Test for hitting a hw access breakpoint
+ */
+static struct test_struct nmi_sleep_test[] = {
+ { "?", "S0*" }, /* Clear break points */
+ { "c", "T0*", 0, got_break }, /* Continue */
+ { "D", "OK" }, /* Detach */
+ { "D", "OK", 0, got_break }, /* If the test worked we made it here */
+ { "", "" },
+};
+
+static void fill_get_buf(char *buf)
+{
+ unsigned char checksum = 0;
+ int count = 0;
+ char ch;
+
+ strcpy(get_buf, "$");
+ strcat(get_buf, buf);
+ while ((ch = buf[count])) {
+ checksum += ch;
+ count++;
+ }
+ strcat(get_buf, "#");
+ get_buf[count + 2] = hexchars[checksum >> 4];
+ get_buf[count + 3] = hexchars[checksum & 0xf];
+ get_buf[count + 4] = '\0';
+ v2printk("get%i: %s\n", ts.idx, get_buf);
+}
+
+static int validate_simple_test(char *put_str)
+{
+ char *chk_str;
+
+ if (ts.tst[ts.idx].put_handler)
+ return ts.tst[ts.idx].put_handler(put_str,
+ ts.tst[ts.idx].put);
+
+ chk_str = ts.tst[ts.idx].put;
+ if (*put_str == '$')
+ put_str++;
+
+ while (*chk_str != '\0' && *put_str != '\0') {
+ /* If someone does a * to match the rest of the string, allow
+ * it, or stop if the recieved string is complete.
+ */
+ if (*put_str == '#' || *chk_str == '*')
+ return 0;
+ if (*put_str != *chk_str)
+ return 1;
+
+ chk_str++;
+ put_str++;
+ }
+ if (*chk_str == '\0' && (*put_str == '\0' || *put_str == '#'))
+ return 0;
+
+ return 1;
+}
+
+static int run_simple_test(int is_get_char, int chr)
+{
+ int ret = 0;
+ if (is_get_char) {
+ /* Send an ACK on the get if a prior put completed and set the
+ * send ack variable
+ */
+ if (send_ack) {
+ send_ack = 0;
+ return '+';
+ }
+ /* On the first get char, fill the transmit buffer and then
+ * take from the get_string.
+ */
+ if (get_buf_cnt == 0) {
+ if (ts.tst[ts.idx].get_handler)
+ ts.tst[ts.idx].get_handler(ts.tst[ts.idx].get);
+ else
+ fill_get_buf(ts.tst[ts.idx].get);
+ }
+
+ if (get_buf[get_buf_cnt] == '\0') {
+ eprintk("kgdbts: ERROR GET: EOB on '%s' at %i\n",
+ ts.name, ts.idx);
+ get_buf_cnt = 0;
+ fill_get_buf("D");
+ }
+ ret = get_buf[get_buf_cnt];
+ get_buf_cnt++;
+ return ret;
+ }
+
+ /* This callback is a put char which is when kgdb sends data to
+ * this I/O module.
+ */
+ if (ts.tst[ts.idx].get[0] == '\0' &&
+ ts.tst[ts.idx].put[0] == '\0') {
+ eprintk("kgdbts: ERROR: beyond end of test on"
+ " '%s' line %i\n", ts.name, ts.idx);
+ return 0;
+ }
+
+ if (put_buf_cnt >= BUFMAX) {
+ eprintk("kgdbts: ERROR: put buffer overflow on"
+ " '%s' line %i\n", ts.name, ts.idx);
+ put_buf_cnt = 0;
+ return 0;
+ }
+ /* Ignore everything until the first valid packet start '$' */
+ if (put_buf_cnt == 0 && chr != '$')
+ return 0;
+
+ put_buf[put_buf_cnt] = chr;
+ put_buf_cnt++;
+
+ /* End of packet == #XX so look for the '#' */
+ if (put_buf_cnt > 3 && put_buf[put_buf_cnt - 3] == '#') {
+ put_buf[put_buf_cnt] = '\0';
+ v2printk("put%i: %s\n", ts.idx, put_buf);
+ /* Trigger check here */
+ if (ts.validate_put && ts.validate_put(put_buf)) {
+ eprintk("kgdbts: ERROR PUT: end of test "
+ "buffer on '%s' line %i expected %s got %s\n",
+ ts.name, ts.idx, ts.tst[ts.idx].put, put_buf);
+ }
+ ts.idx++;
+ put_buf_cnt = 0;
+ get_buf_cnt = 0;
+ send_ack = 1;
+ }
+ return 0;
+}
+
+static void init_simple_test(void)
+{
+ memset(&ts, 0, sizeof(ts));
+ ts.run_test = run_simple_test;
+ ts.validate_put = validate_simple_test;
+}
+
+static void run_plant_and_detach_test(int is_early)
+{
+ char before[BREAK_INSTR_SIZE];
+ char after[BREAK_INSTR_SIZE];
+
+ probe_kernel_read(before, (char *)kgdbts_break_test,
+ BREAK_INSTR_SIZE);
+ init_simple_test();
+ ts.tst = plant_and_detach_test;
+ ts.name = "plant_and_detach_test";
+ /* Activate test with initial breakpoint */
+ if (!is_early)
+ kgdb_breakpoint();
+ probe_kernel_read(after, (char *)kgdbts_break_test,
+ BREAK_INSTR_SIZE);
+ if (memcmp(before, after, BREAK_INSTR_SIZE)) {
+ printk(KERN_CRIT "kgdbts: ERROR kgdb corrupted memory\n");
+ panic("kgdb memory corruption");
+ }
+
+ /* complete the detach test */
+ if (!is_early)
+ kgdbts_break_test();
+}
+
+static void run_breakpoint_test(int is_hw_breakpoint)
+{
+ test_complete = 0;
+ init_simple_test();
+ if (is_hw_breakpoint) {
+ ts.tst = hw_breakpoint_test;
+ ts.name = "hw_breakpoint_test";
+ } else {
+ ts.tst = sw_breakpoint_test;
+ ts.name = "sw_breakpoint_test";
+ }
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+ /* run code with the break point in it */
+ kgdbts_break_test();
+ kgdb_breakpoint();
+
+ if (test_complete)
+ return;
+
+ eprintk("kgdbts: ERROR %s test failed\n", ts.name);
+}
+
+static void run_hw_break_test(int is_write_test)
+{
+ test_complete = 0;
+ init_simple_test();
+ if (is_write_test) {
+ ts.tst = hw_write_break_test;
+ ts.name = "hw_write_break_test";
+ } else {
+ ts.tst = hw_access_break_test;
+ ts.name = "hw_access_break_test";
+ }
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+ hw_break_val_access();
+ if (is_write_test) {
+ if (test_complete == 2)
+ eprintk("kgdbts: ERROR %s broke on access\n",
+ ts.name);
+ hw_break_val_write();
+ }
+ kgdb_breakpoint();
+
+ if (test_complete == 1)
+ return;
+
+ eprintk("kgdbts: ERROR %s test failed\n", ts.name);
+}
+
+static void run_nmi_sleep_test(int nmi_sleep)
+{
+ unsigned long flags;
+
+ init_simple_test();
+ ts.tst = nmi_sleep_test;
+ ts.name = "nmi_sleep_test";
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+ local_irq_save(flags);
+ mdelay(nmi_sleep*1000);
+ touch_nmi_watchdog();
+ local_irq_restore(flags);
+ if (test_complete != 2)
+ eprintk("kgdbts: ERROR nmi_test did not hit nmi\n");
+ kgdb_breakpoint();
+ if (test_complete == 1)
+ return;
+
+ eprintk("kgdbts: ERROR %s test failed\n", ts.name);
+}
+
+static void run_bad_read_test(void)
+{
+ init_simple_test();
+ ts.tst = bad_read_test;
+ ts.name = "bad_read_test";
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+}
+
+static void run_do_fork_test(void)
+{
+ init_simple_test();
+ ts.tst = do_fork_test;
+ ts.name = "do_fork_test";
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+}
+
+static void run_sys_open_test(void)
+{
+ init_simple_test();
+ ts.tst = sys_open_test;
+ ts.name = "sys_open_test";
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+}
+
+static void run_singlestep_break_test(void)
+{
+ init_simple_test();
+ ts.tst = singlestep_break_test;
+ ts.name = "singlestep_breakpoint_test";
+ /* Activate test with initial breakpoint */
+ kgdb_breakpoint();
+ kgdbts_break_test();
+ kgdbts_break_test();
+}
+
+static void kgdbts_run_tests(void)
+{
+ char *ptr;
+ int fork_test = 0;
+ int sys_open_test = 0;
+ int nmi_sleep = 0;
+
+ ptr = strstr(config, "F");
+ if (ptr)
+ fork_test = simple_strtol(ptr+1, NULL, 10);
+ ptr = strstr(config, "S");
+ if (ptr)
+ sys_open_test = simple_strtol(ptr+1, NULL, 10);
+ ptr = strstr(config, "N");
+ if (ptr)
+ nmi_sleep = simple_strtol(ptr+1, NULL, 10);
+
+ /* required internal KGDB tests */
+ v1printk("kgdbts:RUN plant and detach test\n");
+ run_plant_and_detach_test(0);
+ v1printk("kgdbts:RUN sw breakpoint test\n");
+ run_breakpoint_test(0);
+ v1printk("kgdbts:RUN bad memory access test\n");
+ run_bad_read_test();
+ v1printk("kgdbts:RUN singlestep breakpoint test\n");
+ run_singlestep_break_test();
+
+ /* ===Optional tests=== */
+
+ /* All HW break point tests */
+ if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) {
+ v1printk("kgdbts:RUN hw breakpoint test\n");
+ run_breakpoint_test(1);
+ v1printk("kgdbts:RUN hw write breakpoint test\n");
+ run_hw_break_test(1);
+ v1printk("kgdbts:RUN access write breakpoint test\n");
+ run_hw_break_test(0);
+ }
+
+ if (nmi_sleep) {
+ v1printk("kgdbts:RUN NMI sleep %i seconds test\n", nmi_sleep);
+ run_nmi_sleep_test(nmi_sleep);
+ }
+
+ /* If the do_fork test is run it will be the last test that is
+ * executed because a kernel thread will be spawned at the very
+ * end to unregister the debug hooks.
+ */
+ if (fork_test) {
+ repeat_test = fork_test;
+ printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
+ repeat_test);
+ kthread_run(kgdbts_unreg_thread, 0, "kgdbts_unreg");
+ run_do_fork_test();
+ return;
+ }
+
+ /* If the sys_open test is run it will be the last test that is
+ * executed because a kernel thread will be spawned at the very
+ * end to unregister the debug hooks.
+ */
+ if (sys_open_test) {
+ repeat_test = sys_open_test;
+ printk(KERN_INFO "kgdbts:RUN sys_open for %i breakpoints\n",
+ repeat_test);
+ kthread_run(kgdbts_unreg_thread, 0, "kgdbts_unreg");
+ run_sys_open_test();
+ return;
+ }
+ /* Shutdown and unregister */
+ kgdb_unregister_io_module(&kgdbts_io_ops);
+ configured = 0;
+}
+
+static int kgdbts_option_setup(char *opt)
+{
+ if (strlen(opt) > MAX_CONFIG_LEN) {
+ printk(KERN_ERR "kgdbts: config string too long\n");
+ return -ENOSPC;
+ }
+ strcpy(config, opt);
+
+ verbose = 0;
+ if (strstr(config, "V1"))
+ verbose = 1;
+ if (strstr(config, "V2"))
+ verbose = 2;
+
+ return 0;
+}
+
+__setup("kgdbts=", kgdbts_option_setup);
+
+static int configure_kgdbts(void)
+{
+ int err = 0;
+
+ if (!strlen(config) || isspace(config[0]))
+ goto noconfig;
+ err = kgdbts_option_setup(config);
+ if (err)
+ goto noconfig;
+
+ final_ack = 0;
+ run_plant_and_detach_test(1);
+
+ err = kgdb_register_io_module(&kgdbts_io_ops);
+ if (err) {
+ configured = 0;
+ return err;
+ }
+ configured = 1;
+ kgdbts_run_tests();
+
+ return err;
+
+noconfig:
+ config[0] = 0;
+ configured = 0;
+
+ return err;
+}
+
+static int __init init_kgdbts(void)
+{
+ /* Already configured? */
+ if (configured == 1)
+ return 0;
+
+ return configure_kgdbts();
+}
+
+static void cleanup_kgdbts(void)
+{
+ if (configured == 1)
+ kgdb_unregister_io_module(&kgdbts_io_ops);
+}
+
+static int kgdbts_get_char(void)
+{
+ int val = 0;
+
+ if (ts.run_test)
+ val = ts.run_test(1, 0);
+
+ return val;
+}
+
+static void kgdbts_put_char(u8 chr)
+{
+ if (ts.run_test)
+ ts.run_test(0, chr);
+}
+
+static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
+{
+ int len = strlen(kmessage);
+
+ if (len >= MAX_CONFIG_LEN) {
+ printk(KERN_ERR "kgdbts: config string too long\n");
+ return -ENOSPC;
+ }
+
+ /* Only copy in the string if the init function has not run yet */
+ if (configured < 0) {
+ strcpy(config, kmessage);
+ return 0;
+ }
+
+ if (kgdb_connected) {
+ printk(KERN_ERR
+ "kgdbts: Cannot reconfigure while KGDB is connected.\n");
+
+ return -EBUSY;
+ }
+
+ strcpy(config, kmessage);
+ /* Chop out \n char as a result of echo */
+ if (config[len - 1] == '\n')
+ config[len - 1] = '\0';
+
+ if (configured == 1)
+ cleanup_kgdbts();
+
+ /* Go and configure with the new params. */
+ return configure_kgdbts();
+}
+
+static void kgdbts_pre_exp_handler(void)
+{
+ /* Increment the module count when the debugger is active */
+ if (!kgdb_connected)
+ try_module_get(THIS_MODULE);
+}
+
+static void kgdbts_post_exp_handler(void)
+{
+ /* decrement the module count when the debugger detaches */
+ if (!kgdb_connected)
+ module_put(THIS_MODULE);
+}
+
+static struct kgdb_io kgdbts_io_ops = {
+ .name = "kgdbts",
+ .read_char = kgdbts_get_char,
+ .write_char = kgdbts_put_char,
+ .pre_exception = kgdbts_pre_exp_handler,
+ .post_exception = kgdbts_post_exp_handler,
+};
+
+module_init(init_kgdbts);
+module_exit(cleanup_kgdbts);
+module_param_call(kgdbts, param_set_kgdbts_var, param_get_string, &kps, 0644);
+MODULE_PARM_DESC(kgdbts, "<A|V1|V2>[F#|S#][N#]");
+MODULE_DESCRIPTION("KGDB Test Suite");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Wind River Systems, Inc.");
+
}
}
+#ifdef CONFIG_CONSOLE_POLL
+/*
+ * Console polling routines for writing and reading from the uart while
+ * in an interrupt or debug context.
+ */
+
+static int serial8250_get_poll_char(struct uart_port *port)
+{
+ struct uart_8250_port *up = (struct uart_8250_port *)port;
+ unsigned char lsr = serial_inp(up, UART_LSR);
+
+ while (!(lsr & UART_LSR_DR))
+ lsr = serial_inp(up, UART_LSR);
+
+ return serial_inp(up, UART_RX);
+}
+
+
+static void serial8250_put_poll_char(struct uart_port *port,
+ unsigned char c)
+{
+ unsigned int ier;
+ struct uart_8250_port *up = (struct uart_8250_port *)port;
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = serial_in(up, UART_IER);
+ if (up->capabilities & UART_CAP_UUE)
+ serial_out(up, UART_IER, UART_IER_UUE);
+ else
+ serial_out(up, UART_IER, 0);
+
+ wait_for_xmitr(up, BOTH_EMPTY);
+ /*
+ * Send the character out.
+ * If a LF, also do CR...
+ */
+ serial_out(up, UART_TX, c);
+ if (c == 10) {
+ wait_for_xmitr(up, BOTH_EMPTY);
+ serial_out(up, UART_TX, 13);
+ }
+
+ /*
+ * Finally, wait for transmitter to become empty
+ * and restore the IER
+ */
+ wait_for_xmitr(up, BOTH_EMPTY);
+ serial_out(up, UART_IER, ier);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
static int serial8250_startup(struct uart_port *port)
{
struct uart_8250_port *up = (struct uart_8250_port *)port;
.request_port = serial8250_request_port,
.config_port = serial8250_config_port,
.verify_port = serial8250_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = serial8250_get_poll_char,
+ .poll_put_char = serial8250_put_poll_char,
+#endif
};
static struct uart_8250_port serial8250_ports[UART_NR];
config SERIAL_CORE_CONSOLE
bool
+config CONSOLE_POLL
+ bool
+
config SERIAL_68328
bool "68328 serial support"
depends on M68328 || M68EZ328 || M68VZ328
obj-$(CONFIG_SERIAL_NETX) += netx-serial.o
obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
+obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
spin_unlock_irqrestore(&uap->port.lock, flags);
}
+#ifdef CONFIG_CONSOLE_POLL
+static int pl010_get_poll_char(struct uart_port *port)
+{
+ struct uart_amba_port *uap = (struct uart_amba_port *)port;
+ unsigned int status;
+
+ do {
+ status = readw(uap->port.membase + UART01x_FR);
+ } while (status & UART01x_FR_RXFE);
+
+ return readw(uap->port.membase + UART01x_DR);
+}
+
+static void pl010_put_poll_char(struct uart_port *port,
+ unsigned char ch)
+{
+ struct uart_amba_port *uap = (struct uart_amba_port *)port;
+
+ while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)
+ barrier();
+
+ writew(ch, uap->port.membase + UART01x_DR);
+}
+
+#endif /* CONFIG_CONSOLE_POLL */
+
static int pl011_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = pl010_get_poll_char,
+ .poll_put_char = pl010_put_poll_char,
+#endif
};
static struct uart_amba_port *amba_ports[UART_NR];
--- /dev/null
+/*
+ * Based on the same principle as kgdboe using the NETPOLL api, this
+ * driver uses a console polling api to implement a gdb serial inteface
+ * which is multiplexed on a console port.
+ *
+ * Maintainer: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * 2007-2008 (c) Jason Wessel - Wind River Systems, Inc.
+ *
+ * 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/kernel.h>
+#include <linux/ctype.h>
+#include <linux/kgdb.h>
+#include <linux/tty.h>
+
+#define MAX_CONFIG_LEN 40
+
+static struct kgdb_io kgdboc_io_ops;
+
+/* -1 = init not run yet, 0 = unconfigured, 1 = configured. */
+static int configured = -1;
+
+static char config[MAX_CONFIG_LEN];
+static struct kparam_string kps = {
+ .string = config,
+ .maxlen = MAX_CONFIG_LEN,
+};
+
+static struct tty_driver *kgdb_tty_driver;
+static int kgdb_tty_line;
+
+static int kgdboc_option_setup(char *opt)
+{
+ if (strlen(opt) > MAX_CONFIG_LEN) {
+ printk(KERN_ERR "kgdboc: config string too long\n");
+ return -ENOSPC;
+ }
+ strcpy(config, opt);
+
+ return 0;
+}
+
+__setup("kgdboc=", kgdboc_option_setup);
+
+static int configure_kgdboc(void)
+{
+ struct tty_driver *p;
+ int tty_line = 0;
+ int err;
+
+ err = kgdboc_option_setup(config);
+ if (err || !strlen(config) || isspace(config[0]))
+ goto noconfig;
+
+ err = -ENODEV;
+
+ p = tty_find_polling_driver(config, &tty_line);
+ if (!p)
+ goto noconfig;
+
+ kgdb_tty_driver = p;
+ kgdb_tty_line = tty_line;
+
+ err = kgdb_register_io_module(&kgdboc_io_ops);
+ if (err)
+ goto noconfig;
+
+ configured = 1;
+
+ return 0;
+
+noconfig:
+ config[0] = 0;
+ configured = 0;
+
+ return err;
+}
+
+static int __init init_kgdboc(void)
+{
+ /* Already configured? */
+ if (configured == 1)
+ return 0;
+
+ return configure_kgdboc();
+}
+
+static void cleanup_kgdboc(void)
+{
+ if (configured == 1)
+ kgdb_unregister_io_module(&kgdboc_io_ops);
+}
+
+static int kgdboc_get_char(void)
+{
+ return kgdb_tty_driver->poll_get_char(kgdb_tty_driver, kgdb_tty_line);
+}
+
+static void kgdboc_put_char(u8 chr)
+{
+ kgdb_tty_driver->poll_put_char(kgdb_tty_driver, kgdb_tty_line, chr);
+}
+
+static int param_set_kgdboc_var(const char *kmessage, struct kernel_param *kp)
+{
+ int len = strlen(kmessage);
+
+ if (len >= MAX_CONFIG_LEN) {
+ printk(KERN_ERR "kgdboc: config string too long\n");
+ return -ENOSPC;
+ }
+
+ /* Only copy in the string if the init function has not run yet */
+ if (configured < 0) {
+ strcpy(config, kmessage);
+ return 0;
+ }
+
+ if (kgdb_connected) {
+ printk(KERN_ERR
+ "kgdboc: Cannot reconfigure while KGDB is connected.\n");
+
+ return -EBUSY;
+ }
+
+ strcpy(config, kmessage);
+ /* Chop out \n char as a result of echo */
+ if (config[len - 1] == '\n')
+ config[len - 1] = '\0';
+
+ if (configured == 1)
+ cleanup_kgdboc();
+
+ /* Go and configure with the new params. */
+ return configure_kgdboc();
+}
+
+static void kgdboc_pre_exp_handler(void)
+{
+ /* Increment the module count when the debugger is active */
+ if (!kgdb_connected)
+ try_module_get(THIS_MODULE);
+}
+
+static void kgdboc_post_exp_handler(void)
+{
+ /* decrement the module count when the debugger detaches */
+ if (!kgdb_connected)
+ module_put(THIS_MODULE);
+}
+
+static struct kgdb_io kgdboc_io_ops = {
+ .name = "kgdboc",
+ .read_char = kgdboc_get_char,
+ .write_char = kgdboc_put_char,
+ .pre_exception = kgdboc_pre_exp_handler,
+ .post_exception = kgdboc_post_exp_handler,
+};
+
+module_init(init_kgdboc);
+module_exit(cleanup_kgdboc);
+module_param_call(kgdboc, param_set_kgdboc_var, param_get_string, &kps, 0644);
+MODULE_PARM_DESC(kgdboc, "<serial_device>[,baud]");
+MODULE_DESCRIPTION("KGDB Console TTY Driver");
+MODULE_LICENSE("GPL");
}
#endif
-#ifdef CONFIG_SERIAL_CORE_CONSOLE
+#if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
/*
* uart_console_write - write a console message to a serial port
* @port: the port to write the message
* options. The format of the string is <baud><parity><bits><flow>,
* eg: 115200n8r
*/
-void __init
+void
uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow)
{
char *s = options;
if (*s)
*flow = *s;
}
+EXPORT_SYMBOL_GPL(uart_parse_options);
struct baud_rates {
unsigned int rate;
* @bits: number of data bits
* @flow: flow control character - 'r' (rts)
*/
-int __init
+int
uart_set_options(struct uart_port *port, struct console *co,
int baud, int parity, int bits, int flow)
{
port->mctrl |= TIOCM_DTR;
port->ops->set_termios(port, &termios, &dummy);
- co->cflag = termios.c_cflag;
+ /*
+ * Allow the setting of the UART parameters with a NULL console
+ * too:
+ */
+ if (co)
+ co->cflag = termios.c_cflag;
return 0;
}
+EXPORT_SYMBOL_GPL(uart_set_options);
#endif /* CONFIG_SERIAL_CORE_CONSOLE */
static void uart_change_pm(struct uart_state *state, int pm_state)
}
}
+#ifdef CONFIG_CONSOLE_POLL
+
+static int uart_poll_init(struct tty_driver *driver, int line, char *options)
+{
+ struct uart_driver *drv = driver->driver_state;
+ struct uart_state *state = drv->state + line;
+ struct uart_port *port;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int flow = 'n';
+
+ if (!state || !state->port)
+ return -1;
+
+ port = state->port;
+ if (!(port->ops->poll_get_char && port->ops->poll_put_char))
+ return -1;
+
+ if (options) {
+ uart_parse_options(options, &baud, &parity, &bits, &flow);
+ return uart_set_options(port, NULL, baud, parity, bits, flow);
+ }
+
+ return 0;
+}
+
+static int uart_poll_get_char(struct tty_driver *driver, int line)
+{
+ struct uart_driver *drv = driver->driver_state;
+ struct uart_state *state = drv->state + line;
+ struct uart_port *port;
+
+ if (!state || !state->port)
+ return -1;
+
+ port = state->port;
+ return port->ops->poll_get_char(port);
+}
+
+static void uart_poll_put_char(struct tty_driver *driver, int line, char ch)
+{
+ struct uart_driver *drv = driver->driver_state;
+ struct uart_state *state = drv->state + line;
+ struct uart_port *port;
+
+ if (!state || !state->port)
+ return;
+
+ port = state->port;
+ port->ops->poll_put_char(port, ch);
+}
+#endif
+
static const struct tty_operations uart_ops = {
.open = uart_open,
.close = uart_close,
#endif
.tiocmget = uart_tiocmget,
.tiocmset = uart_tiocmset,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_init = uart_poll_init,
+ .poll_get_char = uart_poll_get_char,
+ .poll_put_char = uart_poll_put_char,
+#endif
};
/**
DIE_CALL,
DIE_NMI_IPI,
DIE_PAGE_FAULT,
+ DIE_NMIUNKNOWN,
};
extern void printk_address(unsigned long address, int reliable);
--- /dev/null
+#ifndef _ASM_KGDB_H_
+#define _ASM_KGDB_H_
+
+/*
+ * Copyright (C) 2001-2004 Amit S. Kale
+ * Copyright (C) 2008 Wind River Systems, Inc.
+ */
+
+/*
+ * 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
+
+/*
+ * 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.
+ */
+#ifdef CONFIG_X86_32
+enum regnames {
+ GDB_AX, /* 0 */
+ GDB_CX, /* 1 */
+ GDB_DX, /* 2 */
+ GDB_BX, /* 3 */
+ GDB_SP, /* 4 */
+ GDB_BP, /* 5 */
+ GDB_SI, /* 6 */
+ GDB_DI, /* 7 */
+ GDB_PC, /* 8 also known as eip */
+ GDB_PS, /* 9 also known as eflags */
+ GDB_CS, /* 10 */
+ GDB_SS, /* 11 */
+ GDB_DS, /* 12 */
+ GDB_ES, /* 13 */
+ GDB_FS, /* 14 */
+ GDB_GS, /* 15 */
+};
+#else /* ! CONFIG_X86_32 */
+enum regnames {
+ GDB_AX, /* 0 */
+ GDB_DX, /* 1 */
+ GDB_CX, /* 2 */
+ GDB_BX, /* 3 */
+ GDB_SI, /* 4 */
+ GDB_DI, /* 5 */
+ GDB_BP, /* 6 */
+ GDB_SP, /* 7 */
+ GDB_R8, /* 8 */
+ GDB_R9, /* 9 */
+ GDB_R10, /* 10 */
+ GDB_R11, /* 11 */
+ GDB_R12, /* 12 */
+ GDB_R13, /* 13 */
+ GDB_R14, /* 14 */
+ GDB_R15, /* 15 */
+ GDB_PC, /* 16 */
+ GDB_PS, /* 17 */
+};
+#endif /* CONFIG_X86_32 */
+
+/*
+ * Number of bytes of registers:
+ */
+#ifdef CONFIG_X86_32
+# define NUMREGBYTES 64
+#else
+# define NUMREGBYTES ((GDB_PS+1)*8)
+#endif
+
+static inline void arch_kgdb_breakpoint(void)
+{
+ asm(" int $3");
+}
+#define BREAK_INSTR_SIZE 1
+#define CACHE_FLUSH_IS_SAFE 1
+
+#endif /* _ASM_KGDB_H_ */
/* used to install a new clocksource */
extern int clocksource_register(struct clocksource*);
extern void clocksource_unregister(struct clocksource*);
+extern void clocksource_touch_watchdog(void);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_resume(void);
--- /dev/null
+/*
+ * This provides the callbacks and functions that KGDB needs to share between
+ * the core, I/O and arch-specific portions.
+ *
+ * Author: Amit Kale <amitkale@linsyssoft.com> and
+ * Tom Rini <trini@kernel.crashing.org>
+ *
+ * 2001-2004 (c) Amit S. Kale and 2003-2005 (c) MontaVista Software, Inc.
+ * 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.
+ */
+#ifndef _KGDB_H_
+#define _KGDB_H_
+
+#include <linux/serial_8250.h>
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+#include <asm/atomic.h>
+#include <asm/kgdb.h>
+
+struct pt_regs;
+
+/**
+ * kgdb_skipexception - (optional) exit kgdb_handle_exception early
+ * @exception: Exception vector number
+ * @regs: Current &struct pt_regs.
+ *
+ * On some architectures it is required to skip a breakpoint
+ * exception when it occurs after a breakpoint has been removed.
+ * This can be implemented in the architecture specific portion of
+ * for kgdb.
+ */
+extern int kgdb_skipexception(int exception, struct pt_regs *regs);
+
+/**
+ * kgdb_post_primary_code - (optional) Save error vector/code numbers.
+ * @regs: Original pt_regs.
+ * @e_vector: Original error vector.
+ * @err_code: Original error code.
+ *
+ * This is usually needed on architectures which support SMP and
+ * KGDB. This function is called after all the secondary cpus have
+ * been put to a know spin state and the primary CPU has control over
+ * KGDB.
+ */
+extern void kgdb_post_primary_code(struct pt_regs *regs, int e_vector,
+ int err_code);
+
+/**
+ * kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
+ * @regs: Current &struct pt_regs.
+ *
+ * This function will be called if the particular architecture must
+ * disable hardware debugging while it is processing gdb packets or
+ * handling exception.
+ */
+extern void kgdb_disable_hw_debug(struct pt_regs *regs);
+
+struct tasklet_struct;
+struct task_struct;
+struct uart_port;
+
+/**
+ * kgdb_breakpoint - compiled in breakpoint
+ *
+ * This will be impelmented a static inline per architecture. This
+ * function is called by the kgdb core to execute an architecture
+ * specific trap to cause kgdb to enter the exception processing.
+ *
+ */
+void kgdb_breakpoint(void);
+
+extern int kgdb_connected;
+
+extern atomic_t kgdb_setting_breakpoint;
+extern atomic_t kgdb_cpu_doing_single_step;
+
+extern struct task_struct *kgdb_usethread;
+extern struct task_struct *kgdb_contthread;
+
+enum kgdb_bptype {
+ BP_BREAKPOINT = 0,
+ BP_HARDWARE_BREAKPOINT,
+ BP_WRITE_WATCHPOINT,
+ BP_READ_WATCHPOINT,
+ BP_ACCESS_WATCHPOINT
+};
+
+enum kgdb_bpstate {
+ BP_UNDEFINED = 0,
+ BP_REMOVED,
+ BP_SET,
+ BP_ACTIVE
+};
+
+struct kgdb_bkpt {
+ unsigned long bpt_addr;
+ unsigned char saved_instr[BREAK_INSTR_SIZE];
+ enum kgdb_bptype type;
+ enum kgdb_bpstate state;
+};
+
+#ifndef KGDB_MAX_BREAKPOINTS
+# define KGDB_MAX_BREAKPOINTS 1000
+#endif
+
+#define KGDB_HW_BREAKPOINT 1
+
+/*
+ * Functions each KGDB-supporting architecture must provide:
+ */
+
+/**
+ * kgdb_arch_init - Perform any architecture specific initalization.
+ *
+ * This function will handle the initalization of any architecture
+ * specific callbacks.
+ */
+extern int kgdb_arch_init(void);
+
+/**
+ * kgdb_arch_exit - Perform any architecture specific uninitalization.
+ *
+ * This function will handle the uninitalization of any architecture
+ * specific callbacks, for dynamic registration and unregistration.
+ */
+extern void kgdb_arch_exit(void);
+
+/**
+ * pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs
+ * @gdb_regs: A pointer to hold the registers in the order GDB wants.
+ * @regs: The &struct pt_regs of the current process.
+ *
+ * Convert the pt_regs in @regs into the format for registers that
+ * GDB expects, stored in @gdb_regs.
+ */
+extern void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs);
+
+/**
+ * sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs
+ * @gdb_regs: A pointer to hold the registers in the order GDB wants.
+ * @p: The &struct task_struct of the desired process.
+ *
+ * Convert the register values of the sleeping process in @p to
+ * the format that GDB expects.
+ * This function is called when kgdb does not have access to the
+ * &struct pt_regs and therefore it should fill the gdb registers
+ * @gdb_regs with what has been saved in &struct thread_struct
+ * thread field during switch_to.
+ */
+extern void
+sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p);
+
+/**
+ * gdb_regs_to_pt_regs - Convert GDB regs to ptrace regs.
+ * @gdb_regs: A pointer to hold the registers we've received from GDB.
+ * @regs: A pointer to a &struct pt_regs to hold these values in.
+ *
+ * Convert the GDB regs in @gdb_regs into the pt_regs, and store them
+ * in @regs.
+ */
+extern void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs);
+
+/**
+ * kgdb_arch_handle_exception - Handle architecture specific GDB packets.
+ * @vector: The error vector of the exception that happened.
+ * @signo: The signal number of the exception that happened.
+ * @err_code: The error code of the exception that happened.
+ * @remcom_in_buffer: The buffer of the packet we have read.
+ * @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
+ * @regs: The &struct pt_regs of the current process.
+ *
+ * This function MUST handle the 'c' and 's' command packets,
+ * as well packets to set / remove a hardware breakpoint, if used.
+ * If there are additional packets which the hardware needs to handle,
+ * they are handled here. The code should return -1 if it wants to
+ * process more packets, and a %0 or %1 if it wants to exit from the
+ * kgdb callback.
+ */
+extern int
+kgdb_arch_handle_exception(int vector, int signo, int err_code,
+ char *remcom_in_buffer,
+ char *remcom_out_buffer,
+ struct pt_regs *regs);
+
+/**
+ * kgdb_roundup_cpus - Get other CPUs into a holding pattern
+ * @flags: Current IRQ state
+ *
+ * On SMP systems, we need to get the attention of the other CPUs
+ * and get them be in a known state. This should do what is needed
+ * to get the other CPUs to call kgdb_wait(). Note that on some arches,
+ * the NMI approach is not used for rounding up all the CPUs. For example,
+ * in case of MIPS, smp_call_function() is used to roundup CPUs. In
+ * this case, we have to make sure that interrupts are enabled before
+ * calling smp_call_function(). The argument to this function is
+ * the flags that will be used when restoring the interrupts. There is
+ * local_irq_save() call before kgdb_roundup_cpus().
+ *
+ * On non-SMP systems, this is not called.
+ */
+extern void kgdb_roundup_cpus(unsigned long flags);
+
+/* Optional functions. */
+extern int kgdb_validate_break_address(unsigned long addr);
+extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr);
+extern int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle);
+
+/**
+ * struct kgdb_arch - Describe architecture specific values.
+ * @gdb_bpt_instr: The instruction to trigger a breakpoint.
+ * @flags: Flags for the breakpoint, currently just %KGDB_HW_BREAKPOINT.
+ * @set_breakpoint: Allow an architecture to specify how to set a software
+ * breakpoint.
+ * @remove_breakpoint: Allow an architecture to specify how to remove a
+ * software breakpoint.
+ * @set_hw_breakpoint: Allow an architecture to specify how to set a hardware
+ * breakpoint.
+ * @remove_hw_breakpoint: Allow an architecture to specify how to remove a
+ * hardware breakpoint.
+ * @remove_all_hw_break: Allow an architecture to specify how to remove all
+ * hardware breakpoints.
+ * @correct_hw_break: Allow an architecture to specify how to correct the
+ * hardware debug registers.
+ */
+struct kgdb_arch {
+ unsigned char gdb_bpt_instr[BREAK_INSTR_SIZE];
+ unsigned long flags;
+
+ int (*set_breakpoint)(unsigned long, char *);
+ int (*remove_breakpoint)(unsigned long, char *);
+ int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
+ int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
+ void (*remove_all_hw_break)(void);
+ void (*correct_hw_break)(void);
+};
+
+/**
+ * struct kgdb_io - Describe the interface for an I/O driver to talk with KGDB.
+ * @name: Name of the I/O driver.
+ * @read_char: Pointer to a function that will return one char.
+ * @write_char: Pointer to a function that will write one char.
+ * @flush: Pointer to a function that will flush any pending writes.
+ * @init: Pointer to a function that will initialize the device.
+ * @pre_exception: Pointer to a function that will do any prep work for
+ * the I/O driver.
+ * @post_exception: Pointer to a function that will do any cleanup work
+ * for the I/O driver.
+ */
+struct kgdb_io {
+ const char *name;
+ int (*read_char) (void);
+ void (*write_char) (u8);
+ void (*flush) (void);
+ int (*init) (void);
+ void (*pre_exception) (void);
+ void (*post_exception) (void);
+};
+
+extern struct kgdb_arch arch_kgdb_ops;
+
+extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
+extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
+
+extern int kgdb_hex2long(char **ptr, long *long_val);
+extern int kgdb_mem2hex(char *mem, char *buf, int count);
+extern int kgdb_hex2mem(char *buf, char *mem, int count);
+
+extern int kgdb_isremovedbreak(unsigned long addr);
+
+extern int
+kgdb_handle_exception(int ex_vector, int signo, int err_code,
+ struct pt_regs *regs);
+extern int kgdb_nmicallback(int cpu, void *regs);
+
+extern int kgdb_single_step;
+extern atomic_t kgdb_active;
+
+#endif /* _KGDB_H_ */
void (*config_port)(struct uart_port *, int);
int (*verify_port)(struct uart_port *, struct serial_struct *);
int (*ioctl)(struct uart_port *, unsigned int, unsigned long);
+#ifdef CONFIG_CONSOLE_POLL
+ void (*poll_put_char)(struct uart_port *, unsigned char);
+ int (*poll_get_char)(struct uart_port *);
+#endif
};
#define UART_CONFIG_TYPE (1 << 0)
#include <linux/cdev.h>
struct tty_struct;
+struct tty_driver;
struct tty_operations {
int (*open)(struct tty_struct * tty, struct file * filp);
int (*tiocmget)(struct tty_struct *tty, struct file *file);
int (*tiocmset)(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
+#ifdef CONFIG_CONSOLE_POLL
+ int (*poll_init)(struct tty_driver *driver, int line, char *options);
+ int (*poll_get_char)(struct tty_driver *driver, int line);
+ void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
+#endif
};
struct tty_driver {
int (*tiocmget)(struct tty_struct *tty, struct file *file);
int (*tiocmset)(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
+#ifdef CONFIG_CONSOLE_POLL
+ int (*poll_init)(struct tty_driver *driver, int line, char *options);
+ int (*poll_get_char)(struct tty_driver *driver, int line);
+ void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
+#endif
struct list_head tty_drivers;
};
void put_tty_driver(struct tty_driver *driver);
void tty_set_operations(struct tty_driver *driver,
const struct tty_operations *op);
+extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
/* tty driver magic number */
#define TTY_DRIVER_MAGIC 0x5402
ret; \
})
+/*
+ * probe_kernel_read(): safely attempt to read from a location
+ * @dst: pointer to the buffer that shall take the data
+ * @src: address to read from
+ * @size: size of the data chunk
+ *
+ * Safely read from address @src to the buffer at @dst. If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+extern long probe_kernel_read(void *dst, void *src, size_t size);
+
+/*
+ * probe_kernel_write(): safely attempt to write to a location
+ * @dst: address to write to
+ * @src: pointer to the data that shall be written
+ * @size: size of the data chunk
+ *
+ * Safely write to address @dst from the buffer at @src. If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+extern long probe_kernel_write(void *dst, void *src, size_t size);
+
#endif /* __LINUX_UACCESS_H__ */
obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
obj-$(CONFIG_KPROBES) += kprobes.o
+obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
obj-$(CONFIG_SECCOMP) += seccomp.o
--- /dev/null
+/*
+ * KGDB stub.
+ *
+ * Maintainer: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (C) 2000-2001 VERITAS Software Corporation.
+ * Copyright (C) 2002-2004 Timesys Corporation
+ * Copyright (C) 2003-2004 Amit S. Kale <amitkale@linsyssoft.com>
+ * Copyright (C) 2004 Pavel Machek <pavel@suse.cz>
+ * Copyright (C) 2004-2006 Tom Rini <trini@kernel.crashing.org>
+ * Copyright (C) 2004-2006 LinSysSoft Technologies Pvt. Ltd.
+ * Copyright (C) 2005-2008 Wind River Systems, Inc.
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ * Copyright (C) 2008 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * Contributors at various stages not listed above:
+ * Jason Wessel ( jason.wessel@windriver.com )
+ * George Anzinger <george@mvista.com>
+ * Anurekh Saxena (anurekh.saxena@timesys.com)
+ * Lake Stevens Instrument Division (Glenn Engel)
+ * Jim Kingdon, Cygnus Support.
+ *
+ * Original KGDB stub: David Grothe <dave@gcom.com>,
+ * Tigran Aivazian <tigran@sco.com>
+ *
+ * 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/pid_namespace.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/console.h>
+#include <linux/threads.h>
+#include <linux/uaccess.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ptrace.h>
+#include <linux/reboot.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/sysrq.h>
+#include <linux/init.h>
+#include <linux/kgdb.h>
+#include <linux/pid.h>
+#include <linux/smp.h>
+#include <linux/mm.h>
+
+#include <asm/cacheflush.h>
+#include <asm/byteorder.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+
+static int kgdb_break_asap;
+
+struct kgdb_state {
+ int ex_vector;
+ int signo;
+ int err_code;
+ int cpu;
+ int pass_exception;
+ long threadid;
+ long kgdb_usethreadid;
+ struct pt_regs *linux_regs;
+};
+
+static struct debuggerinfo_struct {
+ void *debuggerinfo;
+ struct task_struct *task;
+} kgdb_info[NR_CPUS];
+
+/**
+ * kgdb_connected - Is a host GDB connected to us?
+ */
+int kgdb_connected;
+EXPORT_SYMBOL_GPL(kgdb_connected);
+
+/* All the KGDB handlers are installed */
+static int kgdb_io_module_registered;
+
+/* Guard for recursive entry */
+static int exception_level;
+
+static struct kgdb_io *kgdb_io_ops;
+static DEFINE_SPINLOCK(kgdb_registration_lock);
+
+/* kgdb console driver is loaded */
+static int kgdb_con_registered;
+/* determine if kgdb console output should be used */
+static int kgdb_use_con;
+
+static int __init opt_kgdb_con(char *str)
+{
+ kgdb_use_con = 1;
+ return 0;
+}
+
+early_param("kgdbcon", opt_kgdb_con);
+
+module_param(kgdb_use_con, int, 0644);
+
+/*
+ * Holds information about breakpoints in a kernel. These breakpoints are
+ * added and removed by gdb.
+ */
+static struct kgdb_bkpt kgdb_break[KGDB_MAX_BREAKPOINTS] = {
+ [0 ... KGDB_MAX_BREAKPOINTS-1] = { .state = BP_UNDEFINED }
+};
+
+/*
+ * The CPU# of the active CPU, or -1 if none:
+ */
+atomic_t kgdb_active = ATOMIC_INIT(-1);
+
+/*
+ * We use NR_CPUs not PERCPU, in case kgdb is used to debug early
+ * bootup code (which might not have percpu set up yet):
+ */
+static atomic_t passive_cpu_wait[NR_CPUS];
+static atomic_t cpu_in_kgdb[NR_CPUS];
+atomic_t kgdb_setting_breakpoint;
+
+struct task_struct *kgdb_usethread;
+struct task_struct *kgdb_contthread;
+
+int kgdb_single_step;
+
+/* Our I/O buffers. */
+static char remcom_in_buffer[BUFMAX];
+static char remcom_out_buffer[BUFMAX];
+
+/* Storage for the registers, in GDB format. */
+static unsigned long gdb_regs[(NUMREGBYTES +
+ sizeof(unsigned long) - 1) /
+ sizeof(unsigned long)];
+
+/* to keep track of the CPU which is doing the single stepping*/
+atomic_t kgdb_cpu_doing_single_step = ATOMIC_INIT(-1);
+
+/*
+ * If you are debugging a problem where roundup (the collection of
+ * all other CPUs) is a problem [this should be extremely rare],
+ * then use the nokgdbroundup option to avoid roundup. In that case
+ * the other CPUs might interfere with your debugging context, so
+ * use this with care:
+ */
+int kgdb_do_roundup = 1;
+
+static int __init opt_nokgdbroundup(char *str)
+{
+ kgdb_do_roundup = 0;
+
+ return 0;
+}
+
+early_param("nokgdbroundup", opt_nokgdbroundup);
+
+/*
+ * Finally, some KGDB code :-)
+ */
+
+/*
+ * Weak aliases for breakpoint management,
+ * can be overriden by architectures when needed:
+ */
+int __weak kgdb_validate_break_address(unsigned long addr)
+{
+ char tmp_variable[BREAK_INSTR_SIZE];
+
+ return probe_kernel_read(tmp_variable, (char *)addr, BREAK_INSTR_SIZE);
+}
+
+int __weak kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
+{
+ int err;
+
+ err = probe_kernel_read(saved_instr, (char *)addr, BREAK_INSTR_SIZE);
+ if (err)
+ return err;
+
+ return probe_kernel_write((char *)addr, arch_kgdb_ops.gdb_bpt_instr,
+ BREAK_INSTR_SIZE);
+}
+
+int __weak kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
+{
+ return probe_kernel_write((char *)addr,
+ (char *)bundle, BREAK_INSTR_SIZE);
+}
+
+unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs)
+{
+ return instruction_pointer(regs);
+}
+
+int __weak kgdb_arch_init(void)
+{
+ return 0;
+}
+
+int __weak kgdb_skipexception(int exception, struct pt_regs *regs)
+{
+ return 0;
+}
+
+void __weak
+kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
+{
+ return;
+}
+
+/**
+ * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb.
+ * @regs: Current &struct pt_regs.
+ *
+ * This function will be called if the particular architecture must
+ * disable hardware debugging while it is processing gdb packets or
+ * handling exception.
+ */
+void __weak kgdb_disable_hw_debug(struct pt_regs *regs)
+{
+}
+
+/*
+ * GDB remote protocol parser:
+ */
+
+static const char hexchars[] = "0123456789abcdef";
+
+static int hex(char ch)
+{
+ if ((ch >= 'a') && (ch <= 'f'))
+ return ch - 'a' + 10;
+ if ((ch >= '0') && (ch <= '9'))
+ return ch - '0';
+ if ((ch >= 'A') && (ch <= 'F'))
+ return ch - 'A' + 10;
+ return -1;
+}
+
+/* scan for the sequence $<data>#<checksum> */
+static void get_packet(char *buffer)
+{
+ unsigned char checksum;
+ unsigned char xmitcsum;
+ int count;
+ char ch;
+
+ do {
+ /*
+ * Spin and wait around for the start character, ignore all
+ * other characters:
+ */
+ while ((ch = (kgdb_io_ops->read_char())) != '$')
+ /* nothing */;
+
+ kgdb_connected = 1;
+ checksum = 0;
+ xmitcsum = -1;
+
+ count = 0;
+
+ /*
+ * now, read until a # or end of buffer is found:
+ */
+ while (count < (BUFMAX - 1)) {
+ ch = kgdb_io_ops->read_char();
+ if (ch == '#')
+ break;
+ checksum = checksum + ch;
+ buffer[count] = ch;
+ count = count + 1;
+ }
+ buffer[count] = 0;
+
+ if (ch == '#') {
+ xmitcsum = hex(kgdb_io_ops->read_char()) << 4;
+ xmitcsum += hex(kgdb_io_ops->read_char());
+
+ if (checksum != xmitcsum)
+ /* failed checksum */
+ kgdb_io_ops->write_char('-');
+ else
+ /* successful transfer */
+ kgdb_io_ops->write_char('+');
+ if (kgdb_io_ops->flush)
+ kgdb_io_ops->flush();
+ }
+ } while (checksum != xmitcsum);
+}
+
+/*
+ * Send the packet in buffer.
+ * Check for gdb connection if asked for.
+ */
+static void put_packet(char *buffer)
+{
+ unsigned char checksum;
+ int count;
+ char ch;
+
+ /*
+ * $<packet info>#<checksum>.
+ */
+ while (1) {
+ kgdb_io_ops->write_char('$');
+ checksum = 0;
+ count = 0;
+
+ while ((ch = buffer[count])) {
+ kgdb_io_ops->write_char(ch);
+ checksum += ch;
+ count++;
+ }
+
+ kgdb_io_ops->write_char('#');
+ kgdb_io_ops->write_char(hexchars[checksum >> 4]);
+ kgdb_io_ops->write_char(hexchars[checksum & 0xf]);
+ if (kgdb_io_ops->flush)
+ kgdb_io_ops->flush();
+
+ /* Now see what we get in reply. */
+ ch = kgdb_io_ops->read_char();
+
+ if (ch == 3)
+ ch = kgdb_io_ops->read_char();
+
+ /* If we get an ACK, we are done. */
+ if (ch == '+')
+ return;
+
+ /*
+ * If we get the start of another packet, this means
+ * that GDB is attempting to reconnect. We will NAK
+ * the packet being sent, and stop trying to send this
+ * packet.
+ */
+ if (ch == '$') {
+ kgdb_io_ops->write_char('-');
+ if (kgdb_io_ops->flush)
+ kgdb_io_ops->flush();
+ return;
+ }
+ }
+}
+
+static char *pack_hex_byte(char *pkt, u8 byte)
+{
+ *pkt++ = hexchars[byte >> 4];
+ *pkt++ = hexchars[byte & 0xf];
+
+ return pkt;
+}
+
+/*
+ * Convert the memory pointed to by mem into hex, placing result in buf.
+ * Return a pointer to the last char put in buf (null). May return an error.
+ */
+int kgdb_mem2hex(char *mem, char *buf, int count)
+{
+ char *tmp;
+ int err;
+
+ /*
+ * We use the upper half of buf as an intermediate buffer for the
+ * raw memory copy. Hex conversion will work against this one.
+ */
+ tmp = buf + count;
+
+ err = probe_kernel_read(tmp, mem, count);
+ if (!err) {
+ while (count > 0) {
+ buf = pack_hex_byte(buf, *tmp);
+ tmp++;
+ count--;
+ }
+
+ *buf = 0;
+ }
+
+ return err;
+}
+
+/*
+ * Copy the binary array pointed to by buf into mem. Fix $, #, and
+ * 0x7d escaped with 0x7d. Return a pointer to the character after
+ * the last byte written.
+ */
+static int kgdb_ebin2mem(char *buf, char *mem, int count)
+{
+ int err = 0;
+ char c;
+
+ while (count-- > 0) {
+ c = *buf++;
+ if (c == 0x7d)
+ c = *buf++ ^ 0x20;
+
+ err = probe_kernel_write(mem, &c, 1);
+ if (err)
+ break;
+
+ mem++;
+ }
+
+ return err;
+}
+
+/*
+ * Convert the hex array pointed to by buf into binary to be placed in mem.
+ * Return a pointer to the character AFTER the last byte written.
+ * May return an error.
+ */
+int kgdb_hex2mem(char *buf, char *mem, int count)
+{
+ char *tmp_raw;
+ char *tmp_hex;
+
+ /*
+ * We use the upper half of buf as an intermediate buffer for the
+ * raw memory that is converted from hex.
+ */
+ tmp_raw = buf + count * 2;
+
+ tmp_hex = tmp_raw - 1;
+ while (tmp_hex >= buf) {
+ tmp_raw--;
+ *tmp_raw = hex(*tmp_hex--);
+ *tmp_raw |= hex(*tmp_hex--) << 4;
+ }
+
+ return probe_kernel_write(mem, tmp_raw, count);
+}
+
+/*
+ * While we find nice hex chars, build a long_val.
+ * Return number of chars processed.
+ */
+int kgdb_hex2long(char **ptr, long *long_val)
+{
+ int hex_val;
+ int num = 0;
+
+ *long_val = 0;
+
+ while (**ptr) {
+ hex_val = hex(**ptr);
+ if (hex_val < 0)
+ break;
+
+ *long_val = (*long_val << 4) | hex_val;
+ num++;
+ (*ptr)++;
+ }
+
+ return num;
+}
+
+/* Write memory due to an 'M' or 'X' packet. */
+static int write_mem_msg(int binary)
+{
+ char *ptr = &remcom_in_buffer[1];
+ unsigned long addr;
+ unsigned long length;
+ int err;
+
+ if (kgdb_hex2long(&ptr, &addr) > 0 && *(ptr++) == ',' &&
+ kgdb_hex2long(&ptr, &length) > 0 && *(ptr++) == ':') {
+ if (binary)
+ err = kgdb_ebin2mem(ptr, (char *)addr, length);
+ else
+ err = kgdb_hex2mem(ptr, (char *)addr, length);
+ if (err)
+ return err;
+ if (CACHE_FLUSH_IS_SAFE)
+ flush_icache_range(addr, addr + length + 1);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static void error_packet(char *pkt, int error)
+{
+ error = -error;
+ pkt[0] = 'E';
+ pkt[1] = hexchars[(error / 10)];
+ pkt[2] = hexchars[(error % 10)];
+ pkt[3] = '\0';
+}
+
+/*
+ * Thread ID accessors. We represent a flat TID space to GDB, where
+ * the per CPU idle threads (which under Linux all have PID 0) are
+ * remapped to negative TIDs.
+ */
+
+#define BUF_THREAD_ID_SIZE 16
+
+static char *pack_threadid(char *pkt, unsigned char *id)
+{
+ char *limit;
+
+ limit = pkt + BUF_THREAD_ID_SIZE;
+ while (pkt < limit)
+ pkt = pack_hex_byte(pkt, *id++);
+
+ return pkt;
+}
+
+static void int_to_threadref(unsigned char *id, int value)
+{
+ unsigned char *scan;
+ int i = 4;
+
+ scan = (unsigned char *)id;
+ while (i--)
+ *scan++ = 0;
+ *scan++ = (value >> 24) & 0xff;
+ *scan++ = (value >> 16) & 0xff;
+ *scan++ = (value >> 8) & 0xff;
+ *scan++ = (value & 0xff);
+}
+
+static struct task_struct *getthread(struct pt_regs *regs, int tid)
+{
+ /*
+ * Non-positive TIDs are remapped idle tasks:
+ */
+ if (tid <= 0)
+ return idle_task(-tid);
+
+ /*
+ * find_task_by_pid_ns() does not take the tasklist lock anymore
+ * but is nicely RCU locked - hence is a pretty resilient
+ * thing to use:
+ */
+ return find_task_by_pid_ns(tid, &init_pid_ns);
+}
+
+/*
+ * CPU debug state control:
+ */
+
+#ifdef CONFIG_SMP
+static void kgdb_wait(struct pt_regs *regs)
+{
+ unsigned long flags;
+ int cpu;
+
+ local_irq_save(flags);
+ cpu = raw_smp_processor_id();
+ kgdb_info[cpu].debuggerinfo = regs;
+ kgdb_info[cpu].task = current;
+ /*
+ * Make sure the above info reaches the primary CPU before
+ * our cpu_in_kgdb[] flag setting does:
+ */
+ smp_wmb();
+ atomic_set(&cpu_in_kgdb[cpu], 1);
+
+ /* Wait till primary CPU is done with debugging */
+ while (atomic_read(&passive_cpu_wait[cpu]))
+ cpu_relax();
+
+ kgdb_info[cpu].debuggerinfo = NULL;
+ kgdb_info[cpu].task = NULL;
+
+ /* fix up hardware debug registers on local cpu */
+ if (arch_kgdb_ops.correct_hw_break)
+ arch_kgdb_ops.correct_hw_break();
+
+ /* Signal the primary CPU that we are done: */
+ atomic_set(&cpu_in_kgdb[cpu], 0);
+ clocksource_touch_watchdog();
+ local_irq_restore(flags);
+}
+#endif
+
+/*
+ * Some architectures need cache flushes when we set/clear a
+ * breakpoint:
+ */
+static void kgdb_flush_swbreak_addr(unsigned long addr)
+{
+ if (!CACHE_FLUSH_IS_SAFE)
+ return;
+
+ if (current->mm && current->mm->mmap_cache) {
+ flush_cache_range(current->mm->mmap_cache,
+ addr, addr + BREAK_INSTR_SIZE);
+ }
+ /* Force flush instruction cache if it was outside the mm */
+ flush_icache_range(addr, addr + BREAK_INSTR_SIZE);
+}
+
+/*
+ * SW breakpoint management:
+ */
+static int kgdb_activate_sw_breakpoints(void)
+{
+ unsigned long addr;
+ int error = 0;
+ int i;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state != BP_SET)
+ continue;
+
+ addr = kgdb_break[i].bpt_addr;
+ error = kgdb_arch_set_breakpoint(addr,
+ kgdb_break[i].saved_instr);
+ if (error)
+ return error;
+
+ kgdb_flush_swbreak_addr(addr);
+ kgdb_break[i].state = BP_ACTIVE;
+ }
+ return 0;
+}
+
+static int kgdb_set_sw_break(unsigned long addr)
+{
+ int err = kgdb_validate_break_address(addr);
+ int breakno = -1;
+ int i;
+
+ if (err)
+ return err;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if ((kgdb_break[i].state == BP_SET) &&
+ (kgdb_break[i].bpt_addr == addr))
+ return -EEXIST;
+ }
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state == BP_REMOVED &&
+ kgdb_break[i].bpt_addr == addr) {
+ breakno = i;
+ break;
+ }
+ }
+
+ if (breakno == -1) {
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state == BP_UNDEFINED) {
+ breakno = i;
+ break;
+ }
+ }
+ }
+
+ if (breakno == -1)
+ return -E2BIG;
+
+ kgdb_break[breakno].state = BP_SET;
+ kgdb_break[breakno].type = BP_BREAKPOINT;
+ kgdb_break[breakno].bpt_addr = addr;
+
+ return 0;
+}
+
+static int kgdb_deactivate_sw_breakpoints(void)
+{
+ unsigned long addr;
+ int error = 0;
+ int i;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state != BP_ACTIVE)
+ continue;
+ addr = kgdb_break[i].bpt_addr;
+ error = kgdb_arch_remove_breakpoint(addr,
+ kgdb_break[i].saved_instr);
+ if (error)
+ return error;
+
+ kgdb_flush_swbreak_addr(addr);
+ kgdb_break[i].state = BP_SET;
+ }
+ return 0;
+}
+
+static int kgdb_remove_sw_break(unsigned long addr)
+{
+ int i;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if ((kgdb_break[i].state == BP_SET) &&
+ (kgdb_break[i].bpt_addr == addr)) {
+ kgdb_break[i].state = BP_REMOVED;
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+int kgdb_isremovedbreak(unsigned long addr)
+{
+ int i;
+
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if ((kgdb_break[i].state == BP_REMOVED) &&
+ (kgdb_break[i].bpt_addr == addr))
+ return 1;
+ }
+ return 0;
+}
+
+int remove_all_break(void)
+{
+ unsigned long addr;
+ int error;
+ int i;
+
+ /* Clear memory breakpoints. */
+ for (i = 0; i < KGDB_MAX_BREAKPOINTS; i++) {
+ if (kgdb_break[i].state != BP_ACTIVE)
+ goto setundefined;
+ addr = kgdb_break[i].bpt_addr;
+ error = kgdb_arch_remove_breakpoint(addr,
+ kgdb_break[i].saved_instr);
+ if (error)
+ printk(KERN_ERR "KGDB: breakpoint remove failed: %lx\n",
+ addr);
+setundefined:
+ kgdb_break[i].state = BP_UNDEFINED;
+ }
+
+ /* Clear hardware breakpoints. */
+ if (arch_kgdb_ops.remove_all_hw_break)
+ arch_kgdb_ops.remove_all_hw_break();
+
+ return 0;
+}
+
+/*
+ * Remap normal tasks to their real PID, idle tasks to -1 ... -NR_CPUs:
+ */
+static inline int shadow_pid(int realpid)
+{
+ if (realpid)
+ return realpid;
+
+ return -1-raw_smp_processor_id();
+}
+
+static char gdbmsgbuf[BUFMAX + 1];
+
+static void kgdb_msg_write(const char *s, int len)
+{
+ char *bufptr;
+ int wcount;
+ int i;
+
+ /* 'O'utput */
+ gdbmsgbuf[0] = 'O';
+
+ /* Fill and send buffers... */
+ while (len > 0) {
+ bufptr = gdbmsgbuf + 1;
+
+ /* Calculate how many this time */
+ if ((len << 1) > (BUFMAX - 2))
+ wcount = (BUFMAX - 2) >> 1;
+ else
+ wcount = len;
+
+ /* Pack in hex chars */
+ for (i = 0; i < wcount; i++)
+ bufptr = pack_hex_byte(bufptr, s[i]);
+ *bufptr = '\0';
+
+ /* Move up */
+ s += wcount;
+ len -= wcount;
+
+ /* Write packet */
+ put_packet(gdbmsgbuf);
+ }
+}
+
+/*
+ * Return true if there is a valid kgdb I/O module. Also if no
+ * debugger is attached a message can be printed to the console about
+ * waiting for the debugger to attach.
+ *
+ * The print_wait argument is only to be true when called from inside
+ * the core kgdb_handle_exception, because it will wait for the
+ * debugger to attach.
+ */
+static int kgdb_io_ready(int print_wait)
+{
+ if (!kgdb_io_ops)
+ return 0;
+ if (kgdb_connected)
+ return 1;
+ if (atomic_read(&kgdb_setting_breakpoint))
+ return 1;
+ if (print_wait)
+ printk(KERN_CRIT "KGDB: Waiting for remote debugger\n");
+ return 1;
+}
+
+/*
+ * All the functions that start with gdb_cmd are the various
+ * operations to implement the handlers for the gdbserial protocol
+ * where KGDB is communicating with an external debugger
+ */
+
+/* Handle the '?' status packets */
+static void gdb_cmd_status(struct kgdb_state *ks)
+{
+ /*
+ * We know that this packet is only sent
+ * during initial connect. So to be safe,
+ * we clear out our breakpoints now in case
+ * GDB is reconnecting.
+ */
+ remove_all_break();
+
+ remcom_out_buffer[0] = 'S';
+ pack_hex_byte(&remcom_out_buffer[1], ks->signo);
+}
+
+/* Handle the 'g' get registers request */
+static void gdb_cmd_getregs(struct kgdb_state *ks)
+{
+ struct task_struct *thread;
+ void *local_debuggerinfo;
+ int i;
+
+ thread = kgdb_usethread;
+ if (!thread) {
+ thread = kgdb_info[ks->cpu].task;
+ local_debuggerinfo = kgdb_info[ks->cpu].debuggerinfo;
+ } else {
+ local_debuggerinfo = NULL;
+ for (i = 0; i < NR_CPUS; i++) {
+ /*
+ * Try to find the task on some other
+ * or possibly this node if we do not
+ * find the matching task then we try
+ * to approximate the results.
+ */
+ if (thread == kgdb_info[i].task)
+ local_debuggerinfo = kgdb_info[i].debuggerinfo;
+ }
+ }
+
+ /*
+ * All threads that don't have debuggerinfo should be
+ * in __schedule() sleeping, since all other CPUs
+ * are in kgdb_wait, and thus have debuggerinfo.
+ */
+ if (local_debuggerinfo) {
+ pt_regs_to_gdb_regs(gdb_regs, local_debuggerinfo);
+ } else {
+ /*
+ * Pull stuff saved during switch_to; nothing
+ * else is accessible (or even particularly
+ * relevant).
+ *
+ * This should be enough for a stack trace.
+ */
+ sleeping_thread_to_gdb_regs(gdb_regs, thread);
+ }
+ kgdb_mem2hex((char *)gdb_regs, remcom_out_buffer, NUMREGBYTES);
+}
+
+/* Handle the 'G' set registers request */
+static void gdb_cmd_setregs(struct kgdb_state *ks)
+{
+ kgdb_hex2mem(&remcom_in_buffer[1], (char *)gdb_regs, NUMREGBYTES);
+
+ if (kgdb_usethread && kgdb_usethread != current) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ } else {
+ gdb_regs_to_pt_regs(gdb_regs, ks->linux_regs);
+ strcpy(remcom_out_buffer, "OK");
+ }
+}
+
+/* Handle the 'm' memory read bytes */
+static void gdb_cmd_memread(struct kgdb_state *ks)
+{
+ char *ptr = &remcom_in_buffer[1];
+ unsigned long length;
+ unsigned long addr;
+ int err;
+
+ if (kgdb_hex2long(&ptr, &addr) > 0 && *ptr++ == ',' &&
+ kgdb_hex2long(&ptr, &length) > 0) {
+ err = kgdb_mem2hex((char *)addr, remcom_out_buffer, length);
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ } else {
+ error_packet(remcom_out_buffer, -EINVAL);
+ }
+}
+
+/* Handle the 'M' memory write bytes */
+static void gdb_cmd_memwrite(struct kgdb_state *ks)
+{
+ int err = write_mem_msg(0);
+
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ else
+ strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'X' memory binary write bytes */
+static void gdb_cmd_binwrite(struct kgdb_state *ks)
+{
+ int err = write_mem_msg(1);
+
+ if (err)
+ error_packet(remcom_out_buffer, err);
+ else
+ strcpy(remcom_out_buffer, "OK");
+}
+
+/* Handle the 'D' or 'k', detach or kill packets */
+static void gdb_cmd_detachkill(struct kgdb_state *ks)
+{
+ int error;
+
+ /* The detach case */
+ if (remcom_in_buffer[0] == 'D') {
+ error = remove_all_break();
+ if (error < 0) {
+ error_packet(remcom_out_buffer, error);
+ } else {
+ strcpy(remcom_out_buffer, "OK");
+ kgdb_connected = 0;
+ }
+ put_packet(remcom_out_buffer);
+ } else {
+ /*
+ * Assume the kill case, with no exit code checking,
+ * trying to force detach the debugger:
+ */
+ remove_all_break();
+ kgdb_connected = 0;
+ }
+}
+
+/* Handle the 'R' reboot packets */
+static int gdb_cmd_reboot(struct kgdb_state *ks)
+{
+ /* For now, only honor R0 */
+ if (strcmp(remcom_in_buffer, "R0") == 0) {
+ printk(KERN_CRIT "Executing emergency reboot\n");
+ strcpy(remcom_out_buffer, "OK");
+ put_packet(remcom_out_buffer);
+
+ /*
+ * Execution should not return from
+ * machine_emergency_restart()
+ */
+ machine_emergency_restart();
+ kgdb_connected = 0;
+
+ return 1;
+ }
+ return 0;
+}
+
+/* Handle the 'q' query packets */
+static void gdb_cmd_query(struct kgdb_state *ks)
+{
+ struct task_struct *thread;
+ unsigned char thref[8];
+ char *ptr;
+ int i;
+
+ switch (remcom_in_buffer[1]) {
+ case 's':
+ case 'f':
+ if (memcmp(remcom_in_buffer + 2, "ThreadInfo", 10)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+
+ if (remcom_in_buffer[1] == 'f')
+ ks->threadid = 1;
+
+ remcom_out_buffer[0] = 'm';
+ ptr = remcom_out_buffer + 1;
+
+ for (i = 0; i < 17; ks->threadid++) {
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (thread) {
+ int_to_threadref(thref, ks->threadid);
+ pack_threadid(ptr, thref);
+ ptr += BUF_THREAD_ID_SIZE;
+ *(ptr++) = ',';
+ i++;
+ }
+ }
+ *(--ptr) = '\0';
+ break;
+
+ case 'C':
+ /* Current thread id */
+ strcpy(remcom_out_buffer, "QC");
+ ks->threadid = shadow_pid(current->pid);
+ int_to_threadref(thref, ks->threadid);
+ pack_threadid(remcom_out_buffer + 2, thref);
+ break;
+ case 'T':
+ if (memcmp(remcom_in_buffer + 1, "ThreadExtraInfo,", 16)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ ks->threadid = 0;
+ ptr = remcom_in_buffer + 17;
+ kgdb_hex2long(&ptr, &ks->threadid);
+ if (!getthread(ks->linux_regs, ks->threadid)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ if (ks->threadid > 0) {
+ kgdb_mem2hex(getthread(ks->linux_regs,
+ ks->threadid)->comm,
+ remcom_out_buffer, 16);
+ } else {
+ static char tmpstr[23 + BUF_THREAD_ID_SIZE];
+
+ sprintf(tmpstr, "Shadow task %d for pid 0",
+ (int)(-ks->threadid-1));
+ kgdb_mem2hex(tmpstr, remcom_out_buffer, strlen(tmpstr));
+ }
+ break;
+ }
+}
+
+/* Handle the 'H' task query packets */
+static void gdb_cmd_task(struct kgdb_state *ks)
+{
+ struct task_struct *thread;
+ char *ptr;
+
+ switch (remcom_in_buffer[1]) {
+ case 'g':
+ ptr = &remcom_in_buffer[2];
+ kgdb_hex2long(&ptr, &ks->threadid);
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (!thread && ks->threadid > 0) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ kgdb_usethread = thread;
+ ks->kgdb_usethreadid = ks->threadid;
+ strcpy(remcom_out_buffer, "OK");
+ break;
+ case 'c':
+ ptr = &remcom_in_buffer[2];
+ kgdb_hex2long(&ptr, &ks->threadid);
+ if (!ks->threadid) {
+ kgdb_contthread = NULL;
+ } else {
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (!thread && ks->threadid > 0) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ kgdb_contthread = thread;
+ }
+ strcpy(remcom_out_buffer, "OK");
+ break;
+ }
+}
+
+/* Handle the 'T' thread query packets */
+static void gdb_cmd_thread(struct kgdb_state *ks)
+{
+ char *ptr = &remcom_in_buffer[1];
+ struct task_struct *thread;
+
+ kgdb_hex2long(&ptr, &ks->threadid);
+ thread = getthread(ks->linux_regs, ks->threadid);
+ if (thread)
+ strcpy(remcom_out_buffer, "OK");
+ else
+ error_packet(remcom_out_buffer, -EINVAL);
+}
+
+/* Handle the 'z' or 'Z' breakpoint remove or set packets */
+static void gdb_cmd_break(struct kgdb_state *ks)
+{
+ /*
+ * Since GDB-5.3, it's been drafted that '0' is a software
+ * breakpoint, '1' is a hardware breakpoint, so let's do that.
+ */
+ char *bpt_type = &remcom_in_buffer[1];
+ char *ptr = &remcom_in_buffer[2];
+ unsigned long addr;
+ unsigned long length;
+ int error = 0;
+
+ if (arch_kgdb_ops.set_hw_breakpoint && *bpt_type >= '1') {
+ /* Unsupported */
+ if (*bpt_type > '4')
+ return;
+ } else {
+ if (*bpt_type != '0' && *bpt_type != '1')
+ /* Unsupported. */
+ return;
+ }
+
+ /*
+ * Test if this is a hardware breakpoint, and
+ * if we support it:
+ */
+ if (*bpt_type == '1' && !(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT))
+ /* Unsupported. */
+ return;
+
+ if (*(ptr++) != ',') {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ if (!kgdb_hex2long(&ptr, &addr)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+ if (*(ptr++) != ',' ||
+ !kgdb_hex2long(&ptr, &length)) {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return;
+ }
+
+ if (remcom_in_buffer[0] == 'Z' && *bpt_type == '0')
+ error = kgdb_set_sw_break(addr);
+ else if (remcom_in_buffer[0] == 'z' && *bpt_type == '0')
+ error = kgdb_remove_sw_break(addr);
+ else if (remcom_in_buffer[0] == 'Z')
+ error = arch_kgdb_ops.set_hw_breakpoint(addr,
+ (int)length, *bpt_type - '0');
+ else if (remcom_in_buffer[0] == 'z')
+ error = arch_kgdb_ops.remove_hw_breakpoint(addr,
+ (int) length, *bpt_type - '0');
+
+ if (error == 0)
+ strcpy(remcom_out_buffer, "OK");
+ else
+ error_packet(remcom_out_buffer, error);
+}
+
+/* Handle the 'C' signal / exception passing packets */
+static int gdb_cmd_exception_pass(struct kgdb_state *ks)
+{
+ /* C09 == pass exception
+ * C15 == detach kgdb, pass exception
+ */
+ if (remcom_in_buffer[1] == '0' && remcom_in_buffer[2] == '9') {
+
+ ks->pass_exception = 1;
+ remcom_in_buffer[0] = 'c';
+
+ } else if (remcom_in_buffer[1] == '1' && remcom_in_buffer[2] == '5') {
+
+ ks->pass_exception = 1;
+ remcom_in_buffer[0] = 'D';
+ remove_all_break();
+ kgdb_connected = 0;
+ return 1;
+
+ } else {
+ error_packet(remcom_out_buffer, -EINVAL);
+ return 0;
+ }
+
+ /* Indicate fall through */
+ return -1;
+}
+
+/*
+ * This function performs all gdbserial command procesing
+ */
+static int gdb_serial_stub(struct kgdb_state *ks)
+{
+ int error = 0;
+ int tmp;
+
+ /* Clear the out buffer. */
+ memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+ if (kgdb_connected) {
+ unsigned char thref[8];
+ char *ptr;
+
+ /* Reply to host that an exception has occurred */
+ ptr = remcom_out_buffer;
+ *ptr++ = 'T';
+ ptr = pack_hex_byte(ptr, ks->signo);
+ ptr += strlen(strcpy(ptr, "thread:"));
+ int_to_threadref(thref, shadow_pid(current->pid));
+ ptr = pack_threadid(ptr, thref);
+ *ptr++ = ';';
+ put_packet(remcom_out_buffer);
+ }
+
+ kgdb_usethread = kgdb_info[ks->cpu].task;
+ ks->kgdb_usethreadid = shadow_pid(kgdb_info[ks->cpu].task->pid);
+ ks->pass_exception = 0;
+
+ while (1) {
+ error = 0;
+
+ /* Clear the out buffer. */
+ memset(remcom_out_buffer, 0, sizeof(remcom_out_buffer));
+
+ get_packet(remcom_in_buffer);
+
+ switch (remcom_in_buffer[0]) {
+ case '?': /* gdbserial status */
+ gdb_cmd_status(ks);
+ break;
+ case 'g': /* return the value of the CPU registers */
+ gdb_cmd_getregs(ks);
+ break;
+ case 'G': /* set the value of the CPU registers - return OK */
+ gdb_cmd_setregs(ks);
+ break;
+ case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
+ gdb_cmd_memread(ks);
+ break;
+ case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+ gdb_cmd_memwrite(ks);
+ break;
+ case 'X': /* XAA..AA,LLLL: Write LLLL bytes at address AA..AA */
+ gdb_cmd_binwrite(ks);
+ break;
+ /* kill or detach. KGDB should treat this like a
+ * continue.
+ */
+ case 'D': /* Debugger detach */
+ case 'k': /* Debugger detach via kill */
+ gdb_cmd_detachkill(ks);
+ goto default_handle;
+ case 'R': /* Reboot */
+ if (gdb_cmd_reboot(ks))
+ goto default_handle;
+ break;
+ case 'q': /* query command */
+ gdb_cmd_query(ks);
+ break;
+ case 'H': /* task related */
+ gdb_cmd_task(ks);
+ break;
+ case 'T': /* Query thread status */
+ gdb_cmd_thread(ks);
+ break;
+ case 'z': /* Break point remove */
+ case 'Z': /* Break point set */
+ gdb_cmd_break(ks);
+ break;
+ case 'C': /* Exception passing */
+ tmp = gdb_cmd_exception_pass(ks);
+ if (tmp > 0)
+ goto default_handle;
+ if (tmp == 0)
+ break;
+ /* Fall through on tmp < 0 */
+ case 'c': /* Continue packet */
+ case 's': /* Single step packet */
+ if (kgdb_contthread && kgdb_contthread != current) {
+ /* Can't switch threads in kgdb */
+ error_packet(remcom_out_buffer, -EINVAL);
+ break;
+ }
+ kgdb_activate_sw_breakpoints();
+ /* Fall through to default processing */
+ default:
+default_handle:
+ error = kgdb_arch_handle_exception(ks->ex_vector,
+ ks->signo,
+ ks->err_code,
+ remcom_in_buffer,
+ remcom_out_buffer,
+ ks->linux_regs);
+ /*
+ * Leave cmd processing on error, detach,
+ * kill, continue, or single step.
+ */
+ if (error >= 0 || remcom_in_buffer[0] == 'D' ||
+ remcom_in_buffer[0] == 'k') {
+ error = 0;
+ goto kgdb_exit;
+ }
+
+ }
+
+ /* reply to the request */
+ put_packet(remcom_out_buffer);
+ }
+
+kgdb_exit:
+ if (ks->pass_exception)
+ error = 1;
+ return error;
+}
+
+static int kgdb_reenter_check(struct kgdb_state *ks)
+{
+ unsigned long addr;
+
+ if (atomic_read(&kgdb_active) != raw_smp_processor_id())
+ return 0;
+
+ /* Panic on recursive debugger calls: */
+ exception_level++;
+ addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
+ kgdb_deactivate_sw_breakpoints();
+
+ /*
+ * If the break point removed ok at the place exception
+ * occurred, try to recover and print a warning to the end
+ * user because the user planted a breakpoint in a place that
+ * KGDB needs in order to function.
+ */
+ if (kgdb_remove_sw_break(addr) == 0) {
+ exception_level = 0;
+ kgdb_skipexception(ks->ex_vector, ks->linux_regs);
+ kgdb_activate_sw_breakpoints();
+ printk(KERN_CRIT "KGDB: re-enter error: breakpoint removed %lx\n",
+ addr);
+ WARN_ON_ONCE(1);
+
+ return 1;
+ }
+ remove_all_break();
+ kgdb_skipexception(ks->ex_vector, ks->linux_regs);
+
+ if (exception_level > 1) {
+ dump_stack();
+ panic("Recursive entry to debugger");
+ }
+
+ printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
+ dump_stack();
+ panic("Recursive entry to debugger");
+
+ return 1;
+}
+
+/*
+ * kgdb_handle_exception() - main entry point from a kernel exception
+ *
+ * Locking hierarchy:
+ * interface locks, if any (begin_session)
+ * kgdb lock (kgdb_active)
+ */
+int
+kgdb_handle_exception(int evector, int signo, int ecode, struct pt_regs *regs)
+{
+ struct kgdb_state kgdb_var;
+ struct kgdb_state *ks = &kgdb_var;
+ unsigned long flags;
+ int error = 0;
+ int i, cpu;
+
+ ks->cpu = raw_smp_processor_id();
+ ks->ex_vector = evector;
+ ks->signo = signo;
+ ks->ex_vector = evector;
+ ks->err_code = ecode;
+ ks->kgdb_usethreadid = 0;
+ ks->linux_regs = regs;
+
+ if (kgdb_reenter_check(ks))
+ return 0; /* Ouch, double exception ! */
+
+acquirelock:
+ /*
+ * Interrupts will be restored by the 'trap return' code, except when
+ * single stepping.
+ */
+ local_irq_save(flags);
+
+ cpu = raw_smp_processor_id();
+
+ /*
+ * Acquire the kgdb_active lock:
+ */
+ while (atomic_cmpxchg(&kgdb_active, -1, cpu) != -1)
+ cpu_relax();
+
+ /*
+ * Do not start the debugger connection on this CPU if the last
+ * instance of the exception handler wanted to come into the
+ * debugger on a different CPU via a single step
+ */
+ if (atomic_read(&kgdb_cpu_doing_single_step) != -1 &&
+ atomic_read(&kgdb_cpu_doing_single_step) != cpu) {
+
+ atomic_set(&kgdb_active, -1);
+ clocksource_touch_watchdog();
+ local_irq_restore(flags);
+
+ goto acquirelock;
+ }
+
+ if (!kgdb_io_ready(1)) {
+ error = 1;
+ goto kgdb_restore; /* No I/O connection, so resume the system */
+ }
+
+ /*
+ * Don't enter if we have hit a removed breakpoint.
+ */
+ if (kgdb_skipexception(ks->ex_vector, ks->linux_regs))
+ goto kgdb_restore;
+
+ /* Call the I/O driver's pre_exception routine */
+ if (kgdb_io_ops->pre_exception)
+ kgdb_io_ops->pre_exception();
+
+ kgdb_info[ks->cpu].debuggerinfo = ks->linux_regs;
+ kgdb_info[ks->cpu].task = current;
+
+ kgdb_disable_hw_debug(ks->linux_regs);
+
+ /*
+ * Get the passive CPU lock which will hold all the non-primary
+ * CPU in a spin state while the debugger is active
+ */
+ if (!kgdb_single_step || !kgdb_contthread) {
+ for (i = 0; i < NR_CPUS; i++)
+ atomic_set(&passive_cpu_wait[i], 1);
+ }
+
+ /*
+ * spin_lock code is good enough as a barrier so we don't
+ * need one here:
+ */
+ atomic_set(&cpu_in_kgdb[ks->cpu], 1);
+
+#ifdef CONFIG_SMP
+ /* Signal the other CPUs to enter kgdb_wait() */
+ if ((!kgdb_single_step || !kgdb_contthread) && kgdb_do_roundup)
+ kgdb_roundup_cpus(flags);
+#endif
+
+ /*
+ * Wait for the other CPUs to be notified and be waiting for us:
+ */
+ for_each_online_cpu(i) {
+ while (!atomic_read(&cpu_in_kgdb[i]))
+ cpu_relax();
+ }
+
+ /*
+ * At this point the primary processor is completely
+ * in the debugger and all secondary CPUs are quiescent
+ */
+ kgdb_post_primary_code(ks->linux_regs, ks->ex_vector, ks->err_code);
+ kgdb_deactivate_sw_breakpoints();
+ kgdb_single_step = 0;
+ kgdb_contthread = NULL;
+ exception_level = 0;
+
+ /* Talk to debugger with gdbserial protocol */
+ error = gdb_serial_stub(ks);
+
+ /* Call the I/O driver's post_exception routine */
+ if (kgdb_io_ops->post_exception)
+ kgdb_io_ops->post_exception();
+
+ kgdb_info[ks->cpu].debuggerinfo = NULL;
+ kgdb_info[ks->cpu].task = NULL;
+ atomic_set(&cpu_in_kgdb[ks->cpu], 0);
+
+ if (!kgdb_single_step || !kgdb_contthread) {
+ for (i = NR_CPUS-1; i >= 0; i--)
+ atomic_set(&passive_cpu_wait[i], 0);
+ /*
+ * Wait till all the CPUs have quit
+ * from the debugger.
+ */
+ for_each_online_cpu(i) {
+ while (atomic_read(&cpu_in_kgdb[i]))
+ cpu_relax();
+ }
+ }
+
+kgdb_restore:
+ /* Free kgdb_active */
+ atomic_set(&kgdb_active, -1);
+ clocksource_touch_watchdog();
+ local_irq_restore(flags);
+
+ return error;
+}
+
+int kgdb_nmicallback(int cpu, void *regs)
+{
+#ifdef CONFIG_SMP
+ if (!atomic_read(&cpu_in_kgdb[cpu]) &&
+ atomic_read(&kgdb_active) != cpu &&
+ atomic_read(&cpu_in_kgdb[atomic_read(&kgdb_active)])) {
+ kgdb_wait((struct pt_regs *)regs);
+ return 0;
+ }
+#endif
+ return 1;
+}
+
+void kgdb_console_write(struct console *co, const char *s, unsigned count)
+{
+ unsigned long flags;
+
+ /* If we're debugging, or KGDB has not connected, don't try
+ * and print. */
+ if (!kgdb_connected || atomic_read(&kgdb_active) != -1)
+ return;
+
+ local_irq_save(flags);
+ kgdb_msg_write(s, count);
+ local_irq_restore(flags);
+}
+
+static struct console kgdbcons = {
+ .name = "kgdb",
+ .write = kgdb_console_write,
+ .flags = CON_PRINTBUFFER | CON_ENABLED,
+ .index = -1,
+};
+
+#ifdef CONFIG_MAGIC_SYSRQ
+static void sysrq_handle_gdb(int key, struct tty_struct *tty)
+{
+ if (!kgdb_io_ops) {
+ printk(KERN_CRIT "ERROR: No KGDB I/O module available\n");
+ return;
+ }
+ if (!kgdb_connected)
+ printk(KERN_CRIT "Entering KGDB\n");
+
+ kgdb_breakpoint();
+}
+
+static struct sysrq_key_op sysrq_gdb_op = {
+ .handler = sysrq_handle_gdb,
+ .help_msg = "Gdb",
+ .action_msg = "GDB",
+};
+#endif
+
+static void kgdb_register_callbacks(void)
+{
+ if (!kgdb_io_module_registered) {
+ kgdb_io_module_registered = 1;
+ kgdb_arch_init();
+#ifdef CONFIG_MAGIC_SYSRQ
+ register_sysrq_key('g', &sysrq_gdb_op);
+#endif
+ if (kgdb_use_con && !kgdb_con_registered) {
+ register_console(&kgdbcons);
+ kgdb_con_registered = 1;
+ }
+ }
+}
+
+static void kgdb_unregister_callbacks(void)
+{
+ /*
+ * When this routine is called KGDB should unregister from the
+ * panic handler and clean up, making sure it is not handling any
+ * break exceptions at the time.
+ */
+ if (kgdb_io_module_registered) {
+ kgdb_io_module_registered = 0;
+ kgdb_arch_exit();
+#ifdef CONFIG_MAGIC_SYSRQ
+ unregister_sysrq_key('g', &sysrq_gdb_op);
+#endif
+ if (kgdb_con_registered) {
+ unregister_console(&kgdbcons);
+ kgdb_con_registered = 0;
+ }
+ }
+}
+
+static void kgdb_initial_breakpoint(void)
+{
+ kgdb_break_asap = 0;
+
+ printk(KERN_CRIT "kgdb: Waiting for connection from remote gdb...\n");
+ kgdb_breakpoint();
+}
+
+/**
+ * kgdb_register_io_module - register KGDB IO module
+ * @new_kgdb_io_ops: the io ops vector
+ *
+ * Register it with the KGDB core.
+ */
+int kgdb_register_io_module(struct kgdb_io *new_kgdb_io_ops)
+{
+ int err;
+
+ spin_lock(&kgdb_registration_lock);
+
+ if (kgdb_io_ops) {
+ spin_unlock(&kgdb_registration_lock);
+
+ printk(KERN_ERR "kgdb: Another I/O driver is already "
+ "registered with KGDB.\n");
+ return -EBUSY;
+ }
+
+ if (new_kgdb_io_ops->init) {
+ err = new_kgdb_io_ops->init();
+ if (err) {
+ spin_unlock(&kgdb_registration_lock);
+ return err;
+ }
+ }
+
+ kgdb_io_ops = new_kgdb_io_ops;
+
+ spin_unlock(&kgdb_registration_lock);
+
+ printk(KERN_INFO "kgdb: Registered I/O driver %s.\n",
+ new_kgdb_io_ops->name);
+
+ /* Arm KGDB now. */
+ kgdb_register_callbacks();
+
+ if (kgdb_break_asap)
+ kgdb_initial_breakpoint();
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kgdb_register_io_module);
+
+/**
+ * kkgdb_unregister_io_module - unregister KGDB IO module
+ * @old_kgdb_io_ops: the io ops vector
+ *
+ * Unregister it with the KGDB core.
+ */
+void kgdb_unregister_io_module(struct kgdb_io *old_kgdb_io_ops)
+{
+ BUG_ON(kgdb_connected);
+
+ /*
+ * KGDB is no longer able to communicate out, so
+ * unregister our callbacks and reset state.
+ */
+ kgdb_unregister_callbacks();
+
+ spin_lock(&kgdb_registration_lock);
+
+ WARN_ON_ONCE(kgdb_io_ops != old_kgdb_io_ops);
+ kgdb_io_ops = NULL;
+
+ spin_unlock(&kgdb_registration_lock);
+
+ printk(KERN_INFO
+ "kgdb: Unregistered I/O driver %s, debugger disabled.\n",
+ old_kgdb_io_ops->name);
+}
+EXPORT_SYMBOL_GPL(kgdb_unregister_io_module);
+
+/**
+ * kgdb_breakpoint - generate breakpoint exception
+ *
+ * This function will generate a breakpoint exception. It is used at the
+ * beginning of a program to sync up with a debugger and can be used
+ * otherwise as a quick means to stop program execution and "break" into
+ * the debugger.
+ */
+void kgdb_breakpoint(void)
+{
+ atomic_set(&kgdb_setting_breakpoint, 1);
+ wmb(); /* Sync point before breakpoint */
+ arch_kgdb_breakpoint();
+ wmb(); /* Sync point after breakpoint */
+ atomic_set(&kgdb_setting_breakpoint, 0);
+}
+EXPORT_SYMBOL_GPL(kgdb_breakpoint);
+
+static int __init opt_kgdb_wait(char *str)
+{
+ kgdb_break_asap = 1;
+
+ if (kgdb_io_module_registered)
+ kgdb_initial_breakpoint();
+
+ return 0;
+}
+
+early_param("kgdbwait", opt_kgdb_wait);
}
/**
+ * clocksource_touch_watchdog - Update watchdog
+ *
+ * Update the watchdog after exception contexts such as kgdb so as not
+ * to incorrectly trip the watchdog.
+ *
+ */
+void clocksource_touch_watchdog(void)
+{
+ clocksource_resume_watchdog();
+}
+
+/**
* clocksource_get_next - Returns the selected clocksource
*
*/
See Documentation/debugging-via-ohci1394.txt for more information.
source "samples/Kconfig"
+
+source "lib/Kconfig.kgdb"
--- /dev/null
+
+menuconfig KGDB
+ bool "KGDB: kernel debugging with remote gdb"
+ select FRAME_POINTER
+ depends on HAVE_ARCH_KGDB
+ depends on DEBUG_KERNEL && EXPERIMENTAL
+ help
+ If you say Y here, it will be possible to remotely debug the
+ kernel using gdb. Documentation of kernel debugger is available
+ at http://kgdb.sourceforge.net as well as in DocBook form
+ in Documentation/DocBook/. If unsure, say N.
+
+config HAVE_ARCH_KGDB_SHADOW_INFO
+ bool
+
+config HAVE_ARCH_KGDB
+ bool
+
+config KGDB_SERIAL_CONSOLE
+ tristate "KGDB: use kgdb over the serial console"
+ depends on KGDB
+ select CONSOLE_POLL
+ select MAGIC_SYSRQ
+ default y
+ help
+ Share a serial console with kgdb. Sysrq-g must be used
+ to break in initially.
+
+config KGDB_TESTS
+ bool "KGDB: internal test suite"
+ depends on KGDB
+ default n
+ help
+ This is a kgdb I/O module specifically designed to test
+ kgdb's internal functions. This kgdb I/O module is
+ intended to for the development of new kgdb stubs
+ as well as regression testing the kgdb internals.
+ See the drivers/misc/kgdbts.c for the details about
+ the tests. The most basic of this I/O module is to boot
+ a kernel boot arguments "kgdbwait kgdbts=V1F100"
+
+config KGDB_TESTS_ON_BOOT
+ bool "KGDB: Run tests on boot"
+ depends on KGDB_TESTS
+ default n
+ help
+ Run the kgdb tests on boot up automatically without the need
+ to pass in a kernel parameter
+
+config KGDB_TESTS_BOOT_STRING
+ string "KGDB: which internal kgdb tests to run"
+ depends on KGDB_TESTS_ON_BOOT
+ default "V1F100"
+ help
+ This is the command string to send the kgdb test suite on
+ boot. See the drivers/misc/kgdbts.c for detailed
+ information about other strings you could use beyond the
+ default of V1F100.
vmalloc.o
obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \
- page_alloc.o page-writeback.o pdflush.o \
+ maccess.o page_alloc.o page-writeback.o pdflush.o \
readahead.o swap.o truncate.o vmscan.o \
prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \
page_isolation.o $(mmu-y)
--- /dev/null
+/*
+ * Access kernel memory without faulting.
+ */
+#include <linux/uaccess.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+
+/**
+ * probe_kernel_read(): safely attempt to read from a location
+ * @dst: pointer to the buffer that shall take the data
+ * @src: address to read from
+ * @size: size of the data chunk
+ *
+ * Safely read from address @src to the buffer at @dst. If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+long probe_kernel_read(void *dst, void *src, size_t size)
+{
+ long ret;
+ mm_segment_t old_fs = get_fs();
+
+ set_fs(KERNEL_DS);
+ pagefault_disable();
+ ret = __copy_from_user_inatomic(dst,
+ (__force const void __user *)src, size);
+ pagefault_enable();
+ set_fs(old_fs);
+
+ return ret ? -EFAULT : 0;
+}
+EXPORT_SYMBOL_GPL(probe_kernel_read);
+
+/**
+ * probe_kernel_write(): safely attempt to write to a location
+ * @dst: address to write to
+ * @src: pointer to the data that shall be written
+ * @size: size of the data chunk
+ *
+ * Safely write to address @dst from the buffer at @src. If a kernel fault
+ * happens, handle that and return -EFAULT.
+ */
+long probe_kernel_write(void *dst, void *src, size_t size)
+{
+ long ret;
+ mm_segment_t old_fs = get_fs();
+
+ set_fs(KERNEL_DS);
+ pagefault_disable();
+ ret = __copy_to_user_inatomic((__force void __user *)dst, src, size);
+ pagefault_enable();
+ set_fs(old_fs);
+
+ return ret ? -EFAULT : 0;
+}
+EXPORT_SYMBOL_GPL(probe_kernel_write);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff