add the 'goldfish' target, useful for experimenting with virtual phone hardware (includes the emulator)

SVN-Revision: 16459

1 files changed, 854 insertions, 0 deletions

diff --git a/target/linux/goldfish/patches-2.6.30/0129--ARM-goldfish-qemutrace-Kernel-instrumentation-fo.patch b/target/linux/goldfish/patches-2.6.30/0129--ARM-goldfish-qemutrace-Kernel-instrumentation-fo.patch
new file mode 100644
index 0000000..c8463ff
--- /dev/null
+++ b/target/linux/goldfish/patches-2.6.30/0129--ARM-goldfish-qemutrace-Kernel-instrumentation-fo.patch
@@ -0,0 +1,854 @@
+From fcd69dd4537320a25a294c82362cc7abe4fe773c Mon Sep 17 00:00:00 2001
+From: Ye Wen <ywen@google.com>
+Date: Fri, 14 Jul 2006 14:51:45 +0700
+Subject: [PATCH 129/134] [ARM] goldfish: qemutrace: Kernel instrumentation for tracing the events.
+
+Like fork, context switch, execve and exit.
+This code is to complement Jack's tracing facility.
+
+To turn tracing on:
+echo 1 > /sysfs/qemu_trace/state
+To turn tracing off: echo 0 > /sysfs/qemu_trace/state
+I also added java methods to Debug.java to turn tracing on and off.
+The kernel driver also supports adding dynamic symbols to the trace.
+To add a symbol 'foo' with hex address 'abcd1234' to the trace:
+echo 'abcd1234 foo' > /sysfs/qemu_trace/symbol
+
+Signed-off-by: Mike Chan <mike@android.com>
+
+[ARM] goldfish: qemutrace: Improved support for tracing thread and process names.
+
+Added a new pseudo file /sys/qemu_trace/process_name to allow user
+programs to add a trace record for a process name change.  Removed
+the tracing of thread and process names from the exit() system call
+because that was not sufficiently general.  Added tracing of thread
+names in set_task_comm() and daemonize().  Added tracing of the
+thread group id to fork() and clone().
+
+Signed-off-by: Jack Veenstra <veenstra@google.com>
+Signed-off-by: Mike Chan <mike@android.com>
+---
+ arch/arm/kernel/entry-armv.S              |    5 +
+ drivers/misc/Kconfig                      |    5 +
+ drivers/misc/Makefile                     |    1 +
+ drivers/misc/qemutrace/Makefile           |    2 +
+ drivers/misc/qemutrace/qemu_trace.c       |  386 +++++++++++++++++++++++++++++
+ drivers/misc/qemutrace/qemu_trace.h       |   22 ++
+ drivers/misc/qemutrace/qemu_trace_sysfs.c |  182 ++++++++++++++
+ fs/exec.c                                 |   14 +
+ kernel/exit.c                             |   14 +
+ kernel/fork.c                             |    8 +
+ kernel/sched.c                            |    9 +
+ mm/mmap.c                                 |   13 +
+ 12 files changed, 661 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/misc/qemutrace/Makefile
+ create mode 100644 drivers/misc/qemutrace/qemu_trace.c
+ create mode 100644 drivers/misc/qemutrace/qemu_trace.h
+ create mode 100644 drivers/misc/qemutrace/qemu_trace_sysfs.c
+
+--- a/arch/arm/kernel/entry-armv.S
++++ b/arch/arm/kernel/entry-armv.S
+@@ -733,6 +733,11 @@ ENTRY(__switch_to)
+ 	ldr	r0, =thread_notify_head
+ 	mov	r1, #THREAD_NOTIFY_SWITCH
+ 	bl	atomic_notifier_call_chain
++#ifdef CONFIG_QEMU_TRACE
++/*
++	mcr	p15, 0, r0, c15, c0, 0		@ signal context switch
++*/
++#endif
+ 	mov	r0, r5
+ 	ldmia	r4, {r4 - sl, fp, sp, pc}	@ Load all regs saved previously
+  UNWIND(.fnend		)
+--- a/drivers/misc/Kconfig
++++ b/drivers/misc/Kconfig
+@@ -233,6 +233,11 @@ config ISL29003
+ 	  This driver can also be built as a module.  If so, the module
+ 	  will be called isl29003.
+ 
++config QEMU_TRACE
++        tristate "Virtual Device for QEMU tracing"
++        ---help---
++          This is a virtual device for QEMU tracing.
++
+ source "drivers/misc/c2port/Kconfig"
+ source "drivers/misc/eeprom/Kconfig"
+ 
+--- a/drivers/misc/Makefile
++++ b/drivers/misc/Makefile
+@@ -20,4 +20,5 @@ obj-$(CONFIG_SGI_GRU)		+= sgi-gru/
+ obj-$(CONFIG_HP_ILO)		+= hpilo.o
+ obj-$(CONFIG_ISL29003)		+= isl29003.o
+ obj-$(CONFIG_C2PORT)		+= c2port/
++obj-$(CONFIG_QEMU_TRACE)	+= qemutrace/
+ obj-y				+= eeprom/
+--- /dev/null
++++ b/drivers/misc/qemutrace/Makefile
+@@ -0,0 +1,2 @@
++obj-$(CONFIG_QEMU_TRACE) := qemu_trace.o
++obj-$(CONFIG_QEMU_TRACE) += qemu_trace_sysfs.o
+--- /dev/null
++++ b/drivers/misc/qemutrace/qemu_trace.c
+@@ -0,0 +1,386 @@
++/* drivers/misc/qemutrace/qemu_trace.c
++ *
++ * Copyright (C) 2007-2008 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * 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.
++ *
++ */
++
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/spinlock.h>
++#include <linux/miscdevice.h>
++#include <linux/pci.h>
++#include <linux/proc_fs.h>
++#include <linux/platform_device.h>
++#include <linux/mm.h>
++#include <linux/sched.h>
++#include <asm/uaccess.h>
++#include <asm/io.h>
++#include <asm/sizes.h>
++#include "qemu_trace.h"
++
++/* trace device registers */
++#define TRACE_DEV_REG_SWITCH            0
++#define TRACE_DEV_REG_FORK              1
++#define TRACE_DEV_REG_EXECVE_PID        2
++#define TRACE_DEV_REG_EXECVE_VMSTART    3
++#define TRACE_DEV_REG_EXECVE_VMEND      4
++#define TRACE_DEV_REG_EXECVE_OFFSET     5
++#define TRACE_DEV_REG_EXECVE_EXEPATH    6
++#define TRACE_DEV_REG_EXIT              7
++#define TRACE_DEV_REG_CMDLINE           8
++#define TRACE_DEV_REG_CMDLINE_LEN       9
++#define TRACE_DEV_REG_MMAP_EXEPATH      10
++#define TRACE_DEV_REG_INIT_PID          11
++#define TRACE_DEV_REG_INIT_NAME         12
++#define TRACE_DEV_REG_CLONE             13
++#define TRACE_DEV_REG_UNMAP_START       14
++#define TRACE_DEV_REG_UNMAP_END         15
++#define TRACE_DEV_REG_NAME              16
++#define TRACE_DEV_REG_TGID              17
++#define TRACE_DEV_REG_DYN_SYM           50
++#define TRACE_DEV_REG_DYN_SYM_ADDR      51
++#define TRACE_DEV_REG_REMOVE_ADDR       52
++#define TRACE_DEV_REG_ENABLE            100
++
++static unsigned char __iomem *qt_base;
++static int init_called;
++
++/* PIDs that start before our device registered */
++#define MAX_INIT_PIDS   2048
++static int tb_next = 0;
++static int init_pids[MAX_INIT_PIDS];
++static DEFINE_SPINLOCK(qemu_trace_lock);
++
++void qemu_trace_start(void)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(1, qt_base + (TRACE_DEV_REG_ENABLE << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++
++void qemu_trace_stop(void)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(0, qt_base + (TRACE_DEV_REG_ENABLE << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++
++int qemu_trace_get_tracing(void)
++{
++	int val = 0;
++	if (qt_base != NULL)
++		val = readl(qt_base + (TRACE_DEV_REG_ENABLE << 2));
++	return val;
++}
++
++void qemu_trace_add_mapping(unsigned int addr, const char *symbol)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	/* Write the address first, then the symbol name. */
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(addr, qt_base + (TRACE_DEV_REG_DYN_SYM_ADDR << 2));
++	writel(symbol, qt_base + (TRACE_DEV_REG_DYN_SYM << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++
++void qemu_trace_remove_mapping(unsigned int addr)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(addr, qt_base + (TRACE_DEV_REG_REMOVE_ADDR << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++
++/* trace the context switch */
++void qemu_trace_cs(struct task_struct *next)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(task_pid_nr(next), qt_base);
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_cs);
++
++/* trace the execve */
++void qemu_trace_execve(int argc, char __user * __user *argv)
++{
++	unsigned long irq_flags;
++	char page[PAGE_SIZE];
++	char *ptr = page;
++
++	if (qt_base == NULL)
++		return;
++
++	while (argc-- > 0) {
++		char __user *str;
++		int len;
++		if (get_user(str, argv ++))
++			return;
++		len = strnlen_user(str, PAGE_SIZE);
++		if (len == 0)
++			return;
++		if (copy_from_user(ptr, str, len))
++			return;
++		ptr += len;
++	}
++
++	if (ptr > page) {
++		int len = ptr - page;
++		spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++		writel(len, qt_base + (TRACE_DEV_REG_CMDLINE_LEN << 2));
++		writel(page, qt_base + (TRACE_DEV_REG_CMDLINE << 2));
++		spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++	}
++}
++EXPORT_SYMBOL(qemu_trace_execve);
++
++/* trace the mmap */
++void qemu_trace_mmap(struct vm_area_struct *vma)
++{
++	unsigned long irq_flags;
++	char page[PAGE_SIZE];
++	char *p;
++
++	if (qt_base == NULL)
++		return;
++
++	if (vma->vm_file == NULL)
++		return;
++
++	p = d_path(&vma->vm_file->f_path, page, PAGE_SIZE);
++	if (IS_ERR(p))
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(vma->vm_start, qt_base + (TRACE_DEV_REG_EXECVE_VMSTART << 2));
++	writel(vma->vm_end, qt_base + (TRACE_DEV_REG_EXECVE_VMEND << 2));
++	writel(vma->vm_pgoff * PAGE_SIZE, qt_base + (TRACE_DEV_REG_EXECVE_OFFSET << 2));
++	writel(p, qt_base + (TRACE_DEV_REG_MMAP_EXEPATH << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_mmap);
++
++/* trace the munmap */
++void qemu_trace_munmap(unsigned long start, unsigned long end)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(start, qt_base + (TRACE_DEV_REG_UNMAP_START << 2));
++	writel(end, qt_base + (TRACE_DEV_REG_UNMAP_END << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_munmap);
++
++/* trace the fork */
++void qemu_trace_fork(struct task_struct *forked, unsigned long clone_flags)
++{
++	unsigned long irq_flags;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	if (qt_base == NULL) {
++		if (tb_next >= MAX_INIT_PIDS) {
++			if (!init_called)
++				printk(KERN_ERR
++				       "QEMU Trace: too many PIDs before "
++				       "device registered ignoring %d\n",
++				       forked->pid);
++		} else {
++			init_pids[tb_next] = task_pid_nr(forked);
++			tb_next++;
++		}
++	} else {
++		writel(task_tgid_nr(forked), qt_base + (TRACE_DEV_REG_TGID << 2));
++		if (clone_flags & CLONE_VM)
++			writel(task_pid_nr(forked), qt_base + (TRACE_DEV_REG_CLONE << 2));
++		else
++			writel(task_pid_nr(forked), qt_base + (TRACE_DEV_REG_FORK << 2));
++	}
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_fork);
++
++/* trace the exit */
++void qemu_trace_exit(int code)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(code, qt_base + (TRACE_DEV_REG_EXIT << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_exit);
++
++/* trace the thread name */
++void qemu_trace_thread_name(const char *name)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(name, qt_base + (TRACE_DEV_REG_NAME << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_thread_name);
++
++/* trace the process name */
++void qemu_trace_process_name(const char *name)
++{
++	unsigned long irq_flags;
++
++	if (qt_base == NULL)
++		return;
++
++	spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++	writel(name, qt_base + (TRACE_DEV_REG_NAME << 2));
++	spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++}
++EXPORT_SYMBOL(qemu_trace_process_name);
++
++static void qemu_trace_pid_exec(struct task_struct *tsk)
++{
++	unsigned long irq_flags;
++	char page[PAGE_SIZE];
++	struct mm_struct *mm = get_task_mm(tsk);
++	if (mm == NULL)
++		return;
++	down_read(&mm->mmap_sem);
++	{
++		struct vm_area_struct *vma = mm->mmap;
++		while (vma) {
++			if ((vma->vm_flags & VM_EXEC) && vma->vm_file) {
++				char *p;
++				p = d_path(&vma->vm_file->f_path, page, PAGE_SIZE);
++				if (!IS_ERR(p)) {
++					spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++					writel(vma->vm_start, qt_base + (TRACE_DEV_REG_EXECVE_VMSTART << 2));
++					writel(vma->vm_end, qt_base + (TRACE_DEV_REG_EXECVE_VMEND << 2));
++					writel(vma->vm_pgoff * PAGE_SIZE, qt_base + (TRACE_DEV_REG_EXECVE_OFFSET << 2));
++					writel(p, qt_base + (TRACE_DEV_REG_EXECVE_EXEPATH << 2));
++					spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++				}
++			}
++			vma = vma->vm_next;
++		}
++	}
++	up_read(&mm->mmap_sem);
++	mmput(mm);
++}
++
++static void qemu_trace_dump_init_threads(void)
++{
++	unsigned long irq_flags;
++	int i;
++
++	for (i = 0; i < tb_next; i++) {
++		struct task_struct *tsk;
++		struct pid *pid = find_get_pid(init_pids[i]);
++		if (pid == NULL)
++			continue;
++
++		if ((tsk = get_pid_task(pid, PIDTYPE_PID)) != NULL) {
++			/* first give the pid and name */
++			task_lock(tsk);
++			spin_lock_irqsave(&qemu_trace_lock, irq_flags);
++			writel(task_tgid_nr(tsk), qt_base + (TRACE_DEV_REG_TGID << 2));
++			writel(task_pid_nr(tsk), qt_base + (TRACE_DEV_REG_INIT_PID << 2));
++			writel(tsk->comm, qt_base + (TRACE_DEV_REG_INIT_NAME << 2));
++			spin_unlock_irqrestore(&qemu_trace_lock, irq_flags);
++			task_unlock(tsk);
++			/* check if the task has execs */
++			qemu_trace_pid_exec(tsk);
++		}
++	}
++}
++
++static int qemu_trace_probe(struct platform_device *pdev)
++{
++	struct resource *r;
++
++	/* not thread safe, but this should not happen */
++	if (qt_base != NULL) {
++		printk(KERN_ERR "QEMU TRACE Device: already mapped at %p\n", qt_base);
++		return -ENODEV;
++	}
++	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	if (r == NULL)
++		return -EINVAL;
++	qt_base = ioremap(r->start, PAGE_SIZE);
++	printk(KERN_INFO "QEMU TRACE Device: The mapped IO base is %p\n", qt_base);
++
++	qemu_trace_dump_init_threads();
++
++	return 0;
++}
++
++static int qemu_trace_remove(struct platform_device *pdev)
++{
++	iounmap(qt_base);
++	qt_base = NULL;
++	return 0;
++}
++
++static struct platform_driver qemu_trace = {
++	.probe = qemu_trace_probe,
++	.remove = qemu_trace_remove,
++	.driver = {
++		.name = "qemu_trace"
++	}
++};
++
++static int __init qemu_trace_dev_init(void)
++{
++	int ret;
++	ret = platform_driver_register(&qemu_trace);
++	init_called = 1;
++	return ret;
++}
++
++static void qemu_trace_dev_exit(void)
++{
++	platform_driver_unregister(&qemu_trace);
++}
++
++
++module_init(qemu_trace_dev_init);
++module_exit(qemu_trace_dev_exit);
++
++MODULE_AUTHOR("Ye Wen <ywen@google.com>");
++MODULE_LICENSE("GPL");
+--- /dev/null
++++ b/drivers/misc/qemutrace/qemu_trace.h
+@@ -0,0 +1,22 @@
++/* drivers/misc/qemutrace/qemu_trace.h
++ *
++ * Copyright (C) 2007-2008 Google, Inc.
++ *
++ * This software is licensed under the terms of the GNU General Public
++ *
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * 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.
++ *
++ */
++
++void qemu_trace_start(void);
++void qemu_trace_stop(void);
++int qemu_trace_get_tracing(void);
++void qemu_trace_add_mapping(unsigned int addr, const char *symbol);
++void qemu_trace_remove_mapping(unsigned int addr);
++void qemu_trace_process_name(const char *name);
+--- /dev/null
++++ b/drivers/misc/qemutrace/qemu_trace_sysfs.c
+@@ -0,0 +1,182 @@
++/* drivers/misc/qemu_sysfs.c
++ *
++ * Copyright (C) 2007-2008 Google, Inc.
++ * Author: Jack Veenstra
++ *
++ * This software is licensed under the terms of the GNU General Public
++ * License version 2, as published by the Free Software Foundation, and
++ * may be copied, distributed, and modified under those terms.
++ *
++ * 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.
++ *
++ */
++
++#include <linux/list.h>
++#include <linux/module.h>
++#include <linux/miscdevice.h>
++#include <linux/sysdev.h>
++#include <linux/fs.h>
++#include <linux/poll.h>
++#include <linux/interrupt.h>
++#include <linux/delay.h>
++#include <linux/clk.h>
++#include <linux/wait.h>
++#include "qemu_trace.h"
++
++MODULE_DESCRIPTION("Qemu Trace Driver");
++MODULE_LICENSE("GPL");
++MODULE_VERSION("1.0");
++
++static struct kobject *qemu_trace_kobj;
++
++static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, char * buf)
++{
++    int val = qemu_trace_get_tracing();
++    buf[0] = '0' + val;
++    buf[1] = '\n';
++    return 2;
++}
++
++static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, const char * buf, size_t n)
++{
++    if (n <= 0)
++	return -EINVAL;
++    if (buf[0] == '0')
++        qemu_trace_stop();
++    else if (buf[0] == '1')
++        qemu_trace_start();
++    else
++	return -EINVAL;
++    return n;
++}
++
++static ssize_t symbol_show(struct kobject *kobj, struct kobj_attribute *attr, char * buf)
++{
++    return 0;
++}
++
++// We are expecting a string of the form "addr symbol" where 'addr' is a hex address
++// (without the leading '0x') and symbol is a newline-terminated string.  This symbol
++// with its corresponding address will be added to the trace file.
++//
++// To remove the mapping for (addr, symbol) in the trace file, write just the
++// address.  As before, the address is in hex without the leading '0x'.  It can
++// be newline-terminated or zero-terminated.
++static ssize_t symbol_store(struct kobject *kobj, struct kobj_attribute *attr, const char * buf, size_t n)
++{
++    const char *cp;
++    unsigned int addr = 0;
++    int len;
++    char *sym;
++
++    if (n <= 0 || buf == NULL)
++	return -EINVAL;
++    for (cp = buf; *cp != ' '; ++cp) {
++        unsigned int digit;
++
++        if (*cp >= '0' && *cp <= '9')
++            digit = *cp - '0';
++        else if (*cp >= 'a' && *cp <= 'f')
++            digit = *cp - 'a' + 10;
++        else if (*cp == 0 || *cp == '\n') {
++            qemu_trace_remove_mapping(addr);
++            return n;
++        } else
++            return -EINVAL;
++        addr = (addr << 4) + digit;
++    }
++    // Move past the space
++    cp += 1;
++
++    // Copy the string to a new buffer so that we can replace the newline
++    // with '\0'.
++    len = strlen(cp);
++    sym = kzalloc(len + 1, GFP_KERNEL);
++    strcpy(sym, cp);
++    if (sym[len - 1] == '\n')
++        sym[len - 1] = 0;
++
++    qemu_trace_add_mapping(addr, sym);
++    kfree(sym);
++    return n;
++}
++
++static ssize_t process_name_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
++{
++    return 0;
++}
++
++/* This expects a string that is the process name.  If the string contains
++ * a trailing newline, that is removed in the emulator tracing code because
++ * it is simpler to do it there.
++ */
++static ssize_t process_name_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n)
++{
++    if (n <= 0 || buf == NULL)
++	return -EINVAL;
++
++    qemu_trace_process_name(buf);
++    return n;
++}
++
++
++#define qemu_trace_attr(_name) \
++static struct kobj_attribute _name##_attr = {	\
++	.attr	= {				\
++		.name = __stringify(_name),	\
++		.mode = 0666,			\
++	},					\
++	.show	= _name##_show,			\
++	.store	= _name##_store,		\
++}
++
++qemu_trace_attr(state);
++qemu_trace_attr(symbol);
++qemu_trace_attr(process_name);
++
++static struct attribute * qemu_trace_attrs[] = {
++	&state_attr.attr,
++	&symbol_attr.attr,
++	&process_name_attr.attr,
++	NULL,
++};
++
++static struct attribute_group qemu_trace_attr_group = {
++	.attrs = qemu_trace_attrs,
++};
++
++static int __init qemu_trace_init(void)
++{
++	int ret;
++
++	qemu_trace_kobj = kobject_create_and_add("qemu_trace", NULL);
++	if (qemu_trace_kobj == NULL) {
++		printk("qemu_trace_init: kobject_create_and_add failed\n");
++		ret = -ENOMEM;
++		return ret;
++	}
++	ret = sysfs_create_group(qemu_trace_kobj, &qemu_trace_attr_group);
++	if (ret) {
++		printk("qemu_trace_init: sysfs_create_group failed\n");
++		goto err;
++	}
++
++	return 0;
++
++err:
++	kobject_del(qemu_trace_kobj);
++	qemu_trace_kobj = NULL;
++	return ret;
++}
++
++static void  __exit qemu_trace_exit(void)
++{
++	sysfs_remove_group(qemu_trace_kobj, &qemu_trace_attr_group);
++	kobject_del(qemu_trace_kobj);
++}
++
++core_initcall(qemu_trace_init);
++module_exit(qemu_trace_exit);
+--- a/fs/exec.c
++++ b/fs/exec.c
+@@ -59,6 +59,9 @@
+ #include <asm/mmu_context.h>
+ #include <asm/tlb.h>
+ #include "internal.h"
++#ifdef CONFIG_QEMU_TRACE
++	void qemu_trace_thread_name(char *name);
++#endif
+ 
+ int core_uses_pid;
+ char core_pattern[CORENAME_MAX_SIZE] = "core";
+@@ -922,6 +925,9 @@ void set_task_comm(struct task_struct *t
+ 	task_lock(tsk);
+ 	strlcpy(tsk->comm, buf, sizeof(tsk->comm));
+ 	task_unlock(tsk);
++#ifdef CONFIG_QEMU_TRACE
++	qemu_trace_thread_name(buf);
++#endif
+ }
+ 
+ int flush_old_exec(struct linux_binprm * bprm)
+@@ -1245,6 +1251,10 @@ void free_bprm(struct linux_binprm *bprm
+ 	kfree(bprm);
+ }
+ 
++#ifdef CONFIG_QEMU_TRACE
++extern void qemu_trace_execve(int argc, char __user * __user * argv);
++#endif
++
+ /*
+  * sys_execve() executes a new program.
+  */
+@@ -1324,6 +1334,10 @@ int do_execve(char * filename,
+ 		goto out;
+ 
+ 	current->flags &= ~PF_KTHREAD;
++#ifdef CONFIG_QEMU_TRACE
++        qemu_trace_execve(bprm->argc, argv);
++#endif
++
+ 	retval = search_binary_handler(bprm,regs);
+ 	if (retval < 0)
+ 		goto out;
+--- a/kernel/exit.c
++++ b/kernel/exit.c
+@@ -60,6 +60,11 @@ DEFINE_TRACE(sched_process_free);
+ DEFINE_TRACE(sched_process_exit);
+ DEFINE_TRACE(sched_process_wait);
+ 
++#ifdef CONFIG_QEMU_TRACE
++void qemu_trace_thread_name(char *name);
++void qemu_trace_exit(int code);
++#endif
++
+ static void exit_mm(struct task_struct * tsk);
+ 
+ static void __unhash_process(struct task_struct *p)
+@@ -426,6 +431,9 @@ void daemonize(const char *name, ...)
+ 	va_start(args, name);
+ 	vsnprintf(current->comm, sizeof(current->comm), name, args);
+ 	va_end(args);
++#ifdef CONFIG_QEMU_TRACE
++	qemu_trace_thread_name(current->comm);
++#endif
+ 
+ 	/*
+ 	 * If we were started as result of loading a module, close all of the
+@@ -1012,6 +1020,12 @@ NORET_TYPE void do_exit(long code)
+ 	preempt_disable();
+ 	/* causes final put_task_struct in finish_task_switch(). */
+ 	tsk->state = TASK_DEAD;
++
++#ifdef CONFIG_QEMU_TRACE
++	/* Emit a trace record for the exit() call. */
++	qemu_trace_exit(code);
++#endif
++
+ 	schedule();
+ 	BUG();
+ 	/* Avoid "noreturn function does return".  */
+--- a/kernel/fork.c
++++ b/kernel/fork.c
+@@ -1333,6 +1333,10 @@ struct task_struct * __cpuinit fork_idle
+ 	return task;
+ }
+ 
++#ifdef CONFIG_QEMU_TRACE
++extern void qemu_trace_fork(struct task_struct *forked, unsigned long clone_flags);
++#endif
++
+ /*
+  *  Ok, this is the main fork-routine.
+  *
+@@ -1434,6 +1438,10 @@ long do_fork(unsigned long clone_flags,
+ 		tracehook_report_clone_complete(trace, regs,
+ 						clone_flags, nr, p);
+ 
++#ifdef CONFIG_QEMU_TRACE
++                qemu_trace_fork(p, clone_flags);
++#endif
++
+ 		if (clone_flags & CLONE_VFORK) {
+ 			freezer_do_not_count();
+ 			wait_for_completion(&vfork);
+--- a/kernel/sched.c
++++ b/kernel/sched.c
+@@ -2747,6 +2747,10 @@ asmlinkage void schedule_tail(struct tas
+ 		put_user(task_pid_vnr(current), current->set_child_tid);
+ }
+ 
++#ifdef CONFIG_QEMU_TRACE
++void qemu_trace_cs(struct task_struct *next);
++#endif
++
+ /*
+  * context_switch - switch to the new MM and the new
+  * thread's register state.
+@@ -2789,6 +2793,11 @@ context_switch(struct rq *rq, struct tas
+ 	spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
+ #endif
+ 
++#ifdef CONFIG_QEMU_TRACE
++	/* Emit a trace record for the context switch. */
++	qemu_trace_cs(next);
++#endif
++
+ 	/* Here we just switch the register state and the stack. */
+ 	switch_to(prev, next, prev);
+ 
+--- a/mm/mmap.c
++++ b/mm/mmap.c
+@@ -903,6 +903,11 @@ void vm_stat_account(struct mm_struct *m
+ }
+ #endif /* CONFIG_PROC_FS */
+ 
++#ifdef CONFIG_QEMU_TRACE
++extern void qemu_trace_mmap(struct vm_area_struct * vma);
++extern void qemu_trace_munmap(unsigned long start, unsigned long end);
++#endif
++
+ /*
+  * The caller must hold down_write(current->mm->mmap_sem).
+  */
+@@ -1209,6 +1214,10 @@ munmap_back:
+ 	pgoff = vma->vm_pgoff;
+ 	vm_flags = vma->vm_flags;
+ 
++#ifdef CONFIG_QEMU_TRACE
++        qemu_trace_mmap(vma);       
++#endif
++
+ 	if (vma_wants_writenotify(vma))
+ 		vma->vm_page_prot = vm_get_page_prot(vm_flags & ~VM_SHARED);
+ 
+@@ -1935,6 +1944,10 @@ int do_munmap(struct mm_struct *mm, unsi
+ 	 * Remove the vma's, and unmap the actual pages
+ 	 */
+ 	detach_vmas_to_be_unmapped(mm, vma, prev, end);
++
++#ifdef CONFIG_QEMU_TRACE
++	qemu_trace_munmap(start, end);
++#endif
+ 	unmap_region(mm, vma, prev, start, end);
+ 
+ 	/* Fix up all other VM information */