lttng: syscall instrumentation

x86-32 and x86-64 system call instrumentation, along with the
lttng-syscalls-generate-headers.sh script that generates the headers
from the system call list. See README for details.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/lttng/instrumentation/syscalls/README

+LTTng system call tracing
+
+1) lttng-syscall-extractor
+
+You need to build a kernel with CONFIG_FTRACE_SYSCALLS=y and
+CONFIG_KALLSYMS_ALL=y for extraction. Apply the linker patch to get your
+kernel to keep the system call metadata after boot.  Then build and load
+the LTTng syscall extractor module. The module will fail to load (this
+is expected). See the dmesg output for system call metadata.
+
+2) Generate system call TRACE_EVENT().
+
+Take the dmesg metadata and feed it to lttng-syscalls-generate-headers.sh, e.g.,
+from the instrumentation/syscalls directory. See the script header for
+usage example.
+
+After these are created, we just need to follow the new system call additions,
+no need to regenerate the whole thing, since system calls are only appended to.

drivers/staging/lttng/instrumentation/syscalls/headers/compat_syscalls_integers.h

+#ifdef CONFIG_X86_64
+#include "x86-32-syscalls-3.1.0-rc6_integers.h"
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/compat_syscalls_pointers.h

+#ifdef CONFIG_X86_64
+#include "x86-32-syscalls-3.1.0-rc6_pointers.h"
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/syscalls_integers.h

+#ifdef CONFIG_X86_64
+#include "x86-64-syscalls-3.0.4_integers.h"
+#endif
+
+#ifdef CONFIG_X86_32
+#include "x86-32-syscalls-3.1.0-rc6_integers.h"
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/syscalls_integers_override.h

+#define OVERRIDE_32_sys_mmap
+#define OVERRIDE_64_sys_mmap
+
+#ifndef CREATE_SYSCALL_TABLE
+
+SC_TRACE_EVENT(sys_mmap,
+	TP_PROTO(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long off),
+	TP_ARGS(addr, len, prot, flags, fd, off),
+	TP_STRUCT__entry(__field_hex(unsigned long, addr) __field(size_t, len) __field(int, prot) __field(int, flags) __field(int, fd) __field(off_t, offset)),
+	TP_fast_assign(tp_assign(addr, addr) tp_assign(len, len) tp_assign(prot, prot) tp_assign(flags, flags) tp_assign(fd, fd) tp_assign(offset, off)),
+	TP_printk()
+)
+
+#endif /* CREATE_SYSCALL_TABLE */

drivers/staging/lttng/instrumentation/syscalls/headers/syscalls_pointers.h

+#ifdef CONFIG_X86_64
+#include "x86-64-syscalls-3.0.4_pointers.h"
+#endif
+
+#ifdef CONFIG_X86_32
+#include "x86-32-syscalls-3.1.0-rc6_pointers.h"
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/syscalls_pointers_override.h

+/*
+ * This is a place-holder for override defines for system calls with
+ * pointers (all architectures).
+ */

drivers/staging/lttng/instrumentation/syscalls/headers/syscalls_unknown.h

+#if !defined(_TRACE_SYSCALLS_UNKNOWN_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SYSCALLS_UNKNOWN_H
+
+#include <linux/tracepoint.h>
+#include <linux/syscalls.h>
+
+#define UNKNOWN_SYSCALL_NRARGS	6
+
+TRACE_EVENT(sys_unknown,
+	TP_PROTO(unsigned int id, unsigned long *args),
+	TP_ARGS(id, args),
+	TP_STRUCT__entry(
+		__field(unsigned int, id)
+		__array(unsigned long, args, UNKNOWN_SYSCALL_NRARGS)
+	),
+	TP_fast_assign(
+		tp_assign(id, id)
+		tp_memcpy(args, args, UNKNOWN_SYSCALL_NRARGS * sizeof(*args))
+	),
+	TP_printk()
+)
+TRACE_EVENT(compat_sys_unknown,
+	TP_PROTO(unsigned int id, unsigned long *args),
+	TP_ARGS(id, args),
+	TP_STRUCT__entry(
+		__field(unsigned int, id)
+		__array(unsigned long, args, UNKNOWN_SYSCALL_NRARGS)
+	),
+	TP_fast_assign(
+		tp_assign(id, id)
+		tp_memcpy(args, args, UNKNOWN_SYSCALL_NRARGS * sizeof(*args))
+	),
+	TP_printk()
+)
+/* 
+ * This is going to hook on sys_exit in the kernel.
+ * We change the name so we don't clash with the sys_exit syscall entry
+ * event.
+ */
+TRACE_EVENT(exit_syscall,
+	TP_PROTO(struct pt_regs *regs, long ret),
+	TP_ARGS(regs, ret),
+	TP_STRUCT__entry(
+		__field(long, ret)
+	),
+	TP_fast_assign(
+		tp_assign(ret, ret)
+	),
+	TP_printk()
+)
+
+#endif /*  _TRACE_SYSCALLS_UNKNOWN_H */
+
+/* This part must be outside protection */
+#include "../../../probes/define_trace.h"

drivers/staging/lttng/instrumentation/syscalls/headers/x86-32-syscalls-3.1.0-rc6_integers_override.h

+#ifndef CONFIG_UID16
+
+#define OVERRIDE_32_sys_getuid16
+#define OVERRIDE_32_sys_getgid16
+#define OVERRIDE_32_sys_geteuid16
+#define OVERRIDE_32_sys_getegid16
+#define OVERRIDE_32_sys_setuid16
+#define OVERRIDE_32_sys_setgid16
+#define OVERRIDE_32_sys_setfsuid16
+#define OVERRIDE_32_sys_setfsgid16
+#define OVERRIDE_32_sys_setreuid16
+#define OVERRIDE_32_sys_setregid16
+#define OVERRIDE_32_sys_fchown16
+#define OVERRIDE_32_sys_setresuid16
+#define OVERRIDE_32_sys_setresgid16
+
+#define OVERRIDE_TABLE_32_sys_getuid16
+#define OVERRIDE_TABLE_32_sys_getgid16
+#define OVERRIDE_TABLE_32_sys_geteuid16
+#define OVERRIDE_TABLE_32_sys_getegid16
+#define OVERRIDE_TABLE_32_sys_setuid16
+#define OVERRIDE_TABLE_32_sys_setgid16
+#define OVERRIDE_TABLE_32_sys_setreuid16
+#define OVERRIDE_TABLE_32_sys_setregid16
+#define OVERRIDE_TABLE_32_sys_fchown16
+#define OVERRIDE_TABLE_32_sys_setfsuid16
+#define OVERRIDE_TABLE_32_sys_setfsgid16
+#define OVERRIDE_TABLE_32_sys_setresuid16
+#define OVERRIDE_TABLE_32_sys_setresgid16
+
+#endif
+
+#ifdef CREATE_SYSCALL_TABLE
+
+#define OVERRIDE_TABLE_32_sys_mmap
+TRACE_SYSCALL_TABLE(sys_mmap, sys_mmap, 90, 6)
+
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/x86-32-syscalls-3.1.0-rc6_pointers_override.h

+#ifndef CONFIG_UID16
+
+#define OVERRIDE_32_sys_getgroups16
+#define OVERRIDE_32_sys_setgroups16
+#define OVERRIDE_32_sys_lchown16
+#define OVERRIDE_32_sys_getresuid16
+#define OVERRIDE_32_sys_getresgid16
+#define OVERRIDE_32_sys_chown16
+
+#define OVERRIDE_TABLE_32_sys_getgroups16
+#define OVERRIDE_TABLE_32_sys_setgroups16
+#define OVERRIDE_TABLE_32_sys_lchown16
+#define OVERRIDE_TABLE_32_sys_getresuid16
+#define OVERRIDE_TABLE_32_sys_getresgid16
+#define OVERRIDE_TABLE_32_sys_chown16
+
+#endif

drivers/staging/lttng/instrumentation/syscalls/headers/x86-64-syscalls-3.0.4_integers_override.h

+/*
+ * this is a place-holder for x86_64 interger syscall definition override.
+ */

drivers/staging/lttng/instrumentation/syscalls/headers/x86-64-syscalls-3.0.4_pointers_override.h

+#ifndef CREATE_SYSCALL_TABLE
+
+#else	/* CREATE_SYSCALL_TABLE */
+
+#endif /* CREATE_SYSCALL_TABLE */

drivers/staging/lttng/instrumentation/syscalls/lttng-syscalls-extractor/Makefile

+obj-m += lttng-syscalls-extractor.o

drivers/staging/lttng/instrumentation/syscalls/lttng-syscalls-extractor/lttng-syscalls-extractor.c

+/*
+ * Copyright 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ * Copyright 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
+ *
+ * Dump syscall metadata to console.
+ *
+ * GPLv2 license.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/kallsyms.h>
+#include <linux/dcache.h>
+#include <linux/ftrace_event.h>
+#include <trace/syscall.h>
+
+#ifndef CONFIG_FTRACE_SYSCALLS
+#error "You need to set CONFIG_FTRACE_SYSCALLS=y"
+#endif
+
+#ifndef CONFIG_KALLSYMS_ALL
+#error "You need to set CONFIG_KALLSYMS_ALL=y"
+#endif
+
+static struct syscall_metadata **__start_syscalls_metadata;
+static struct syscall_metadata **__stop_syscalls_metadata;
+
+static __init
+struct syscall_metadata *find_syscall_meta(unsigned long syscall)
+{
+	struct syscall_metadata **iter;
+
+	for (iter = __start_syscalls_metadata;
+			iter < __stop_syscalls_metadata; iter++) {
+		if ((*iter)->syscall_nr == syscall)
+			return (*iter);
+	}
+	return NULL;
+}
+
+int init_module(void)
+{
+	struct syscall_metadata *meta;
+	int i;
+
+	__start_syscalls_metadata = (void *) kallsyms_lookup_name("__start_syscalls_metadata");
+	__stop_syscalls_metadata = (void *) kallsyms_lookup_name("__stop_syscalls_metadata");
+
+	for (i = 0; i < NR_syscalls; i++) {
+		int j;
+
+		meta = find_syscall_meta(i);
+		if (!meta)
+			continue;
+		printk("syscall %s nr %d nbargs %d ",
+			meta->name, meta->syscall_nr, meta->nb_args);
+		printk("types: (");
+		for (j = 0; j < meta->nb_args; j++) {
+			if (j > 0)
+				printk(", ");
+			printk("%s", meta->types[j]);
+		}
+		printk(") ");
+		printk("args: (");
+		for (j = 0; j < meta->nb_args; j++) {
+			if (j > 0)
+				printk(", ");
+			printk("%s", meta->args[j]);
+		}
+		printk(")\n");
+	}
+	printk("SUCCESS\n");
+
+	return -1;
+}
+
+void cleanup_module(void)
+{
+}  
+
+MODULE_LICENSE("GPL");

drivers/staging/lttng/instrumentation/syscalls/lttng-syscalls-generate-headers.sh

+#!/bin/sh
+
+# Generate system call probe description macros from syscall metadata dump file.
+# example usage:
+#
+# lttng-syscalls-generate-headers.sh integers 3.0.4 x86-64-syscalls-3.0.4 64
+# lttng-syscalls-generate-headers.sh pointers 3.0.4 x86-64-syscalls-3.0.4 64
+
+CLASS=$1
+INPUTDIR=$2
+INPUTFILE=$3
+BITNESS=$4
+INPUT=${INPUTDIR}/${INPUTFILE}
+SRCFILE=gen.tmp.0
+TMPFILE=gen.tmp.1
+HEADER=headers/${INPUTFILE}_${CLASS}.h
+
+cp ${INPUT} ${SRCFILE}
+
+#Cleanup
+perl -p -e 's/^\[.*\] //g' ${SRCFILE} > ${TMPFILE}
+mv ${TMPFILE} ${SRCFILE}
+
+perl -p -e 's/^syscall sys_([^ ]*)/syscall $1/g' ${SRCFILE} > ${TMPFILE}
+mv ${TMPFILE} ${SRCFILE}
+
+#Filter
+
+if [ "$CLASS" = integers ]; then
+	#select integers and no-args.
+	CLASSCAP=INTEGERS
+	grep -v "\\*\|cap_user_header_t" ${SRCFILE} > ${TMPFILE}
+	mv ${TMPFILE} ${SRCFILE}
+fi
+
+
+if [ "$CLASS" = pointers ]; then
+	#select system calls using pointers.
+	CLASSCAP=POINTERS
+	grep "\\*\|cap_#user_header_t" ${SRCFILE} > ${TMPFILE}
+	mv ${TMPFILE} ${SRCFILE}
+fi
+
+echo "/* THIS FILE IS AUTO-GENERATED. DO NOT EDIT */" > ${HEADER}
+
+echo \
+"#ifndef CREATE_SYSCALL_TABLE
+
+#if !defined(_TRACE_SYSCALLS_${CLASSCAP}_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SYSCALLS_${CLASSCAP}_H
+
+#include <linux/tracepoint.h>
+#include <linux/syscalls.h>
+#include \"${INPUTFILE}_${CLASS}_override.h\"
+#include \"syscalls_${CLASS}_override.h\"
+" >> ${HEADER}
+
+if [ "$CLASS" = integers ]; then
+
+NRARGS=0
+
+echo \
+'SC_DECLARE_EVENT_CLASS_NOARGS(syscalls_noargs,\n'\
+'	TP_STRUCT__entry(),\n'\
+'	TP_fast_assign(),\n'\
+'	TP_printk()\n'\
+')'\
+	>> ${HEADER}
+
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^)]*)\) '\
+'args: \(([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_DEFINE_EVENT_NOARGS(syscalls_noargs, sys_$1)\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+fi
+
+
+# types: 4
+# args   5
+
+NRARGS=1
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^)]*)\) '\
+'args: \(([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $5),\n'\
+'	TP_ARGS($5),\n'\
+'	TP_STRUCT__entry(__field($4, $5)),\n'\
+'	TP_fast_assign(tp_assign($4, $5, $5)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+# types: 4 5
+# args   6 7
+
+NRARGS=2
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^,]*), ([^)]*)\) '\
+'args: \(([^,]*), ([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $6, $5 $7),\n'\
+'	TP_ARGS($6, $7),\n'\
+'	TP_STRUCT__entry(__field($4, $6) __field($5, $7)),\n'\
+'	TP_fast_assign(tp_assign($4, $6, $6) tp_assign($5, $7, $7)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+# types: 4 5 6
+# args   7 8 9
+
+NRARGS=3
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^,]*), ([^,]*), ([^)]*)\) '\
+'args: \(([^,]*), ([^,]*), ([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $7, $5 $8, $6 $9),\n'\
+'	TP_ARGS($7, $8, $9),\n'\
+'	TP_STRUCT__entry(__field($4, $7) __field($5, $8) __field($6, $9)),\n'\
+'	TP_fast_assign(tp_assign($4, $7, $7) tp_assign($5, $8, $8) tp_assign($6, $9, $9)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+
+# types: 4 5  6  7
+# args   8 9 10 11
+
+NRARGS=4
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^,]*), ([^,]*), ([^,]*), ([^)]*)\) '\
+'args: \(([^,]*), ([^,]*), ([^,]*), ([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $8, $5 $9, $6 $10, $7 $11),\n'\
+'	TP_ARGS($8, $9, $10, $11),\n'\
+'	TP_STRUCT__entry(__field($4, $8) __field($5, $9) __field($6, $10) __field($7, $11)),\n'\
+'	TP_fast_assign(tp_assign($4, $8, $8) tp_assign($5, $9, $9) tp_assign($6, $10, $10) tp_assign($7, $11, $11)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+# types: 4  5  6  7  8
+# args   9 10 11 12 13
+
+NRARGS=5
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^)]*)\) '\
+'args: \(([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $9, $5 $10, $6 $11, $7 $12, $8 $13),\n'\
+'	TP_ARGS($9, $10, $11, $12, $13),\n'\
+'	TP_STRUCT__entry(__field($4, $9) __field($5, $10) __field($6, $11) __field($7, $12) __field($8, $13)),\n'\
+'	TP_fast_assign(tp_assign($4, $9, $9) tp_assign($5, $10, $10) tp_assign($6, $11, $11) tp_assign($7, $12, $12) tp_assign($8, $13, $13)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+
+# types: 4   5  6  7  8  9
+# args   10 11 12 13 14 15
+
+NRARGS=6
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) '\
+'types: \(([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^\)]*)\) '\
+'args: \(([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^,]*), ([^\)]*)\)/'\
+'#ifndef OVERRIDE_'"${BITNESS}"'_sys_$1\n'\
+'SC_TRACE_EVENT(sys_$1,\n'\
+'	TP_PROTO($4 $10, $5 $11, $6 $12, $7 $13, $8 $14, $9 $15),\n'\
+'	TP_ARGS($10, $11, $12, $13, $14, $15),\n'\
+'	TP_STRUCT__entry(__field($4, $10) __field($5, $11) __field($6, $12) __field($7, $13) __field($8, $14) __field($9, $15)),\n'\
+'	TP_fast_assign(tp_assign($4, $10, $10) tp_assign($5, $11, $11) tp_assign($6, $12, $12) tp_assign($7, $13, $13) tp_assign($8, $14, $14) tp_assign($9, $15, $15)),\n'\
+'	TP_printk()\n'\
+')\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+# Macro for tracing syscall table
+
+rm -f ${TMPFILE}
+for NRARGS in $(seq 0 6); do
+	grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} >> ${TMPFILE}
+done
+
+echo \
+"
+#endif /*  _TRACE_SYSCALLS_${CLASSCAP}_H */
+
+/* This part must be outside protection */
+#include \"../../../probes/define_trace.h\"
+
+#else /* CREATE_SYSCALL_TABLE */
+
+#include \"${INPUTFILE}_${CLASS}_override.h\"
+#include \"syscalls_${CLASS}_override.h\"
+" >> ${HEADER}
+
+NRARGS=0
+
+if [ "$CLASS" = integers ]; then
+#noargs
+grep "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) .*$/'\
+'#ifndef OVERRIDE_TABLE_'"${BITNESS}"'_sys_$1\n'\
+'TRACE_SYSCALL_TABLE\(syscalls_noargs, sys_$1, $2, $3\)\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+fi
+
+#others.
+grep -v "^syscall [^ ]* nr [^ ]* nbargs ${NRARGS} " ${SRCFILE} > ${TMPFILE}
+perl -p -e 's/^syscall ([^ ]*) nr ([^ ]*) nbargs ([^ ]*) .*$/'\
+'#ifndef OVERRIDE_TABLE_'"${BITNESS}"'_sys_$1\n'\
+'TRACE_SYSCALL_TABLE(sys_$1, sys_$1, $2, $3)\n'\
+'#endif/g'\
+	${TMPFILE} >> ${HEADER}
+
+echo -n \
+"
+#endif /* CREATE_SYSCALL_TABLE */
+" >> ${HEADER}
+
+#fields names: ...char * type with *name* or *file* or *path* or *root*
+# or *put_old* or *type*
+cp -f ${HEADER} ${TMPFILE}
+rm -f ${HEADER}
+perl -p -e 's/__field\(([^,)]*char \*), ([^\)]*)(name|file|path|root|put_old|type)([^\)]*)\)/__string_from_user($2$3$4, $2$3$4)/g'\
+	${TMPFILE} >> ${HEADER}
+cp -f ${HEADER} ${TMPFILE}
+rm -f ${HEADER}
+perl -p -e 's/tp_assign\(([^,)]*char \*), ([^,]*)(name|file|path|root|put_old|type)([^,]*), ([^\)]*)\)/tp_copy_string_from_user($2$3$4, $5)/g'\
+	${TMPFILE} >> ${HEADER}
+
+#prettify addresses heuristics.
+#field names with addr or ptr
+cp -f ${HEADER} ${TMPFILE}
+rm -f ${HEADER}
+perl -p -e 's/__field\(([^,)]*), ([^,)]*addr|[^,)]*ptr)([^),]*)\)/__field_hex($1, $2$3)/g'\
+	${TMPFILE} >> ${HEADER}
+
+#field types ending with '*'
+cp -f ${HEADER} ${TMPFILE}
+rm -f ${HEADER}
+perl -p -e 's/__field\(([^,)]*\*), ([^),]*)\)/__field_hex($1, $2)/g'\
+	${TMPFILE} >> ${HEADER}
+
+#strip the extra type information from tp_assign.
+cp -f ${HEADER} ${TMPFILE}
+rm -f ${HEADER}
+perl -p -e 's/tp_assign\(([^,)]*), ([^,]*), ([^\)]*)\)/tp_assign($2, $3)/g'\
+	${TMPFILE} >> ${HEADER}
+
+rm -f ${INPUTFILE}.tmp
+rm -f ${TMPFILE}
+rm -f ${SRCFILE}