1 files changed, 4971 insertions, 0 deletions

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
new file mode 100644
index 000000000000..47a3227e98b4
--- /dev/null
+++ b/tools/lib/traceevent/event-parse.c
@@ -0,0 +1,4971 @@
+/*
+ * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License (not later!)
+ *
+ * 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  The parts for function graph printing was taken and modified from the
+ *  Linux Kernel that were written by
+ *    - Copyright (C) 2009  Frederic Weisbecker,
+ *  Frederic Weisbecker gave his permission to relicense the code to
+ *  the Lesser General Public License.
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <errno.h>
+
+#include "event-parse.h"
+
+static const char *input_buf;
+static unsigned long long input_buf_ptr;
+static unsigned long long input_buf_siz;
+
+static int show_warning = 1;
+
+#define do_warning(fmt, ...)                            \
+        do {                                            \
+                if (show_warning)                       \
+                        warning(fmt, ##__VA_ARGS__);    \
+        } while (0)
+
+static void init_input_buf(const char *buf, unsigned long long size)
+{
+        input_buf = buf;
+        input_buf_siz = size;
+        input_buf_ptr = 0;
+}
+
+const char *pevent_get_input_buf(void)
+{
+        return input_buf;
+}
+
+unsigned long long pevent_get_input_buf_ptr(void)
+{
+        return input_buf_ptr;
+}
+
+struct event_handler {
+        struct event_handler            *next;
+        int                             id;
+        const char                      *sys_name;
+        const char                      *event_name;
+        pevent_event_handler_func       func;
+        void                            *context;
+};
+
+struct pevent_func_params {
+        struct pevent_func_params       *next;
+        enum pevent_func_arg_type       type;
+};
+
+struct pevent_function_handler {
+        struct pevent_function_handler  *next;
+        enum pevent_func_arg_type       ret_type;
+        char                            *name;
+        pevent_func_handler             func;
+        struct pevent_func_params       *params;
+        int                             nr_args;
+};
+
+static unsigned long long
+process_defined_func(struct trace_seq *s, void *data, int size,
+                     struct event_format *event, struct print_arg *arg);
+
+static void free_func_handle(struct pevent_function_handler *func);
+
+/**
+ * pevent_buffer_init - init buffer for parsing
+ * @buf: buffer to parse
+ * @size: the size of the buffer
+ *
+ * For use with pevent_read_token(), this initializes the internal
+ * buffer that pevent_read_token() will parse.
+ */
+void pevent_buffer_init(const char *buf, unsigned long long size)
+{
+        init_input_buf(buf, size);
+}
+
+void breakpoint(void)
+{
+        static int x;
+        x++;
+}
+
+struct print_arg *alloc_arg(void)
+{
+        struct print_arg *arg;
+
+        arg = malloc_or_die(sizeof(*arg));
+        if (!arg)
+                return NULL;
+        memset(arg, 0, sizeof(*arg));
+
+        return arg;
+}
+
+struct cmdline {
+        char *comm;
+        int pid;
+};
+
+static int cmdline_cmp(const void *a, const void *b)
+{
+        const struct cmdline *ca = a;
+        const struct cmdline *cb = b;
+
+        if (ca->pid < cb->pid)
+                return -1;
+        if (ca->pid > cb->pid)
+                return 1;
+
+        return 0;
+}
+
+struct cmdline_list {
+        struct cmdline_list     *next;
+        char                    *comm;
+        int                     pid;
+};
+
+static int cmdline_init(struct pevent *pevent)
+{
+        struct cmdline_list *cmdlist = pevent->cmdlist;
+        struct cmdline_list *item;
+        struct cmdline *cmdlines;
+        int i;
+
+        cmdlines = malloc_or_die(sizeof(*cmdlines) * pevent->cmdline_count);
+
+        i = 0;
+        while (cmdlist) {
+                cmdlines[i].pid = cmdlist->pid;
+                cmdlines[i].comm = cmdlist->comm;
+                i++;
+                item = cmdlist;
+                cmdlist = cmdlist->next;
+                free(item);
+        }
+
+        qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
+
+        pevent->cmdlines = cmdlines;
+        pevent->cmdlist = NULL;
+
+        return 0;
+}
+
+static char *find_cmdline(struct pevent *pevent, int pid)
+{
+        const struct cmdline *comm;
+        struct cmdline key;
+
+        if (!pid)
+                return "<idle>";
+
+        if (!pevent->cmdlines)
+                cmdline_init(pevent);
+
+        key.pid = pid;
+
+        comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
+                       sizeof(*pevent->cmdlines), cmdline_cmp);
+
+        if (comm)
+                return comm->comm;
+        return "<...>";
+}
+
+/**
+ * pevent_pid_is_registered - return if a pid has a cmdline registered
+ * @pevent: handle for the pevent
+ * @pid: The pid to check if it has a cmdline registered with.
+ *
+ * Returns 1 if the pid has a cmdline mapped to it
+ * 0 otherwise.
+ */
+int pevent_pid_is_registered(struct pevent *pevent, int pid)
+{
+        const struct cmdline *comm;
+        struct cmdline key;
+
+        if (!pid)
+                return 1;
+
+        if (!pevent->cmdlines)
+                cmdline_init(pevent);
+
+        key.pid = pid;
+
+        comm = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
+                       sizeof(*pevent->cmdlines), cmdline_cmp);
+
+        if (comm)
+                return 1;
+        return 0;
+}
+
+/*
+ * If the command lines have been converted to an array, then
+ * we must add this pid. This is much slower than when cmdlines
+ * are added before the array is initialized.
+ */
+static int add_new_comm(struct pevent *pevent, const char *comm, int pid)
+{
+        struct cmdline *cmdlines = pevent->cmdlines;
+        const struct cmdline *cmdline;
+        struct cmdline key;
+
+        if (!pid)
+                return 0;
+
+        /* avoid duplicates */
+        key.pid = pid;
+
+        cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
+                       sizeof(*pevent->cmdlines), cmdline_cmp);
+        if (cmdline) {
+                errno = EEXIST;
+                return -1;
+        }
+
+        cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
+        if (!cmdlines) {
+                errno = ENOMEM;
+                return -1;
+        }
+
+        cmdlines[pevent->cmdline_count].pid = pid;
+        cmdlines[pevent->cmdline_count].comm = strdup(comm);
+        if (!cmdlines[pevent->cmdline_count].comm)
+                die("malloc comm");
+                
+        if (cmdlines[pevent->cmdline_count].comm)
+                pevent->cmdline_count++;
+
+        qsort(cmdlines, pevent->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
+        pevent->cmdlines = cmdlines;
+
+        return 0;
+}
+
+/**
+ * pevent_register_comm - register a pid / comm mapping
+ * @pevent: handle for the pevent
+ * @comm: the command line to register
+ * @pid: the pid to map the command line to
+ *
+ * This adds a mapping to search for command line names with
+ * a given pid. The comm is duplicated.
+ */
+int pevent_register_comm(struct pevent *pevent, const char *comm, int pid)
+{
+        struct cmdline_list *item;
+
+        if (pevent->cmdlines)
+                return add_new_comm(pevent, comm, pid);
+
+        item = malloc_or_die(sizeof(*item));
+        item->comm = strdup(comm);
+        if (!item->comm)
+                die("malloc comm");
+        item->pid = pid;
+        item->next = pevent->cmdlist;
+
+        pevent->cmdlist = item;
+        pevent->cmdline_count++;
+
+        return 0;
+}
+
+struct func_map {
+        unsigned long long              addr;
+        char                            *func;
+        char                            *mod;
+};
+
+struct func_list {
+        struct func_list        *next;
+        unsigned long long      addr;
+        char                    *func;
+        char                    *mod;
+};
+
+static int func_cmp(const void *a, const void *b)
+{
+        const struct func_map *fa = a;
+        const struct func_map *fb = b;
+
+        if (fa->addr < fb->addr)
+                return -1;
+        if (fa->addr > fb->addr)
+                return 1;
+
+        return 0;
+}
+
+/*
+ * We are searching for a record in between, not an exact
+ * match.
+ */
+static int func_bcmp(const void *a, const void *b)
+{
+        const struct func_map *fa = a;
+        const struct func_map *fb = b;
+
+        if ((fa->addr == fb->addr) ||
+
+            (fa->addr > fb->addr &&
+             fa->addr < (fb+1)->addr))
+                return 0;
+
+        if (fa->addr < fb->addr)
+                return -1;
+
+        return 1;
+}
+
+static int func_map_init(struct pevent *pevent)
+{
+        struct func_list *funclist;
+        struct func_list *item;
+        struct func_map *func_map;
+        int i;
+
+        func_map = malloc_or_die(sizeof(*func_map) * (pevent->func_count + 1));
+        funclist = pevent->funclist;
+
+        i = 0;
+        while (funclist) {
+                func_map[i].func = funclist->func;
+                func_map[i].addr = funclist->addr;
+                func_map[i].mod = funclist->mod;
+                i++;
+                item = funclist;
+                funclist = funclist->next;
+                free(item);
+        }
+
+        qsort(func_map, pevent->func_count, sizeof(*func_map), func_cmp);
+
+        /*
+         * Add a special record at the end.
+         */
+        func_map[pevent->func_count].func = NULL;
+        func_map[pevent->func_count].addr = 0;
+        func_map[pevent->func_count].mod = NULL;
+
+        pevent->func_map = func_map;
+        pevent->funclist = NULL;
+
+        return 0;
+}
+
+static struct func_map *
+find_func(struct pevent *pevent, unsigned long long addr)
+{
+        struct func_map *func;
+        struct func_map key;
+
+        if (!pevent->func_map)
+                func_map_init(pevent);
+
+        key.addr = addr;
+
+        func = bsearch(&key, pevent->func_map, pevent->func_count,
+                       sizeof(*pevent->func_map), func_bcmp);
+
+        return func;
+}
+
+/**
+ * pevent_find_function - find a function by a given address
+ * @pevent: handle for the pevent
+ * @addr: the address to find the function with
+ *
+ * Returns a pointer to the function stored that has the given
+ * address. Note, the address does not have to be exact, it
+ * will select the function that would contain the address.
+ */
+const char *pevent_find_function(struct pevent *pevent, unsigned long long addr)
+{
+        struct func_map *map;
+
+        map = find_func(pevent, addr);
+        if (!map)
+                return NULL;
+
+        return map->func;
+}
+
+/**
+ * pevent_find_function_address - find a function address by a given address
+ * @pevent: handle for the pevent
+ * @addr: the address to find the function with
+ *
+ * Returns the address the function starts at. This can be used in
+ * conjunction with pevent_find_function to print both the function
+ * name and the function offset.
+ */
+unsigned long long
+pevent_find_function_address(struct pevent *pevent, unsigned long long addr)
+{
+        struct func_map *map;
+
+        map = find_func(pevent, addr);
+        if (!map)
+                return 0;
+
+        return map->addr;
+}
+
+/**
+ * pevent_register_function - register a function with a given address
+ * @pevent: handle for the pevent
+ * @function: the function name to register
+ * @addr: the address the function starts at
+ * @mod: the kernel module the function may be in (NULL for none)
+ *
+ * This registers a function name with an address and module.
+ * The @func passed in is duplicated.
+ */
+int pevent_register_function(struct pevent *pevent, char *func,
+                             unsigned long long addr, char *mod)
+{
+        struct func_list *item;
+
+        item = malloc_or_die(sizeof(*item));
+
+        item->next = pevent->funclist;
+        item->func = strdup(func);
+        if (mod)
+                item->mod = strdup(mod);
+        else
+                item->mod = NULL;
+        item->addr = addr;
+
+        pevent->funclist = item;
+
+        pevent->func_count++;
+
+        return 0;
+}
+
+/**
+ * pevent_print_funcs - print out the stored functions
+ * @pevent: handle for the pevent
+ *
+ * This prints out the stored functions.
+ */
+void pevent_print_funcs(struct pevent *pevent)
+{
+        int i;
+
+        if (!pevent->func_map)
+                func_map_init(pevent);
+
+        for (i = 0; i < (int)pevent->func_count; i++) {
+                printf("%016llx %s",
+                       pevent->func_map[i].addr,
+                       pevent->func_map[i].func);
+                if (pevent->func_map[i].mod)
+                        printf(" [%s]\n", pevent->func_map[i].mod);
+                else
+                        printf("\n");
+        }
+}
+
+struct printk_map {
+        unsigned long long              addr;
+        char                            *printk;
+};
+
+struct printk_list {
+        struct printk_list      *next;
+        unsigned long long      addr;
+        char                    *printk;
+};
+
+static int printk_cmp(const void *a, const void *b)
+{
+        const struct func_map *fa = a;
+        const struct func_map *fb = b;
+
+        if (fa->addr < fb->addr)
+                return -1;
+        if (fa->addr > fb->addr)
+                return 1;
+
+        return 0;
+}
+
+static void printk_map_init(struct pevent *pevent)
+{
+        struct printk_list *printklist;
+        struct printk_list *item;
+        struct printk_map *printk_map;
+        int i;
+
+        printk_map = malloc_or_die(sizeof(*printk_map) * (pevent->printk_count + 1));
+
+        printklist = pevent->printklist;
+
+        i = 0;
+        while (printklist) {
+                printk_map[i].printk = printklist->printk;
+                printk_map[i].addr = printklist->addr;
+                i++;
+                item = printklist;
+                printklist = printklist->next;
+                free(item);
+        }
+
+        qsort(printk_map, pevent->printk_count, sizeof(*printk_map), printk_cmp);
+
+        pevent->printk_map = printk_map;
+        pevent->printklist = NULL;
+}
+
+static struct printk_map *
+find_printk(struct pevent *pevent, unsigned long long addr)
+{
+        struct printk_map *printk;
+        struct printk_map key;
+
+        if (!pevent->printk_map)
+                printk_map_init(pevent);
+
+        key.addr = addr;
+
+        printk = bsearch(&key, pevent->printk_map, pevent->printk_count,
+                         sizeof(*pevent->printk_map), printk_cmp);
+
+        return printk;
+}
+
+/**
+ * pevent_register_print_string - register a string by its address
+ * @pevent: handle for the pevent
+ * @fmt: the string format to register
+ * @addr: the address the string was located at
+ *
+ * This registers a string by the address it was stored in the kernel.
+ * The @fmt passed in is duplicated.
+ */
+int pevent_register_print_string(struct pevent *pevent, char *fmt,
+                                 unsigned long long addr)
+{
+        struct printk_list *item;
+
+        item = malloc_or_die(sizeof(*item));
+
+        item->next = pevent->printklist;
+        pevent->printklist = item;
+        item->printk = strdup(fmt);
+        item->addr = addr;
+
+        pevent->printk_count++;
+
+        return 0;
+}
+
+/**
+ * pevent_print_printk - print out the stored strings
+ * @pevent: handle for the pevent
+ *
+ * This prints the string formats that were stored.
+ */
+void pevent_print_printk(struct pevent *pevent)
+{
+        int i;
+
+        if (!pevent->printk_map)
+                printk_map_init(pevent);
+
+        for (i = 0; i < (int)pevent->printk_count; i++) {
+                printf("%016llx %s\n",
+                       pevent->printk_map[i].addr,
+                       pevent->printk_map[i].printk);
+        }
+}
+
+static struct event_format *alloc_event(void)
+{
+        struct event_format *event;
+
+        event = malloc_or_die(sizeof(*event));
+        memset(event, 0, sizeof(*event));
+
+        return event;
+}
+
+static void add_event(struct pevent *pevent, struct event_format *event)
+{
+        int i;
+
+        if (!pevent->events)
+                pevent->events = malloc_or_die(sizeof(event));
+        else
+                pevent->events =
+                        realloc(pevent->events, sizeof(event) *
+                                (pevent->nr_events + 1));
+        if (!pevent->events)
+                die("Can not allocate events");
+
+        for (i = 0; i < pevent->nr_events; i++) {
+                if (pevent->events[i]->id > event->id)
+                        break;
+        }
+        if (i < pevent->nr_events)
+                memmove(&pevent->events[i + 1],
+                        &pevent->events[i],
+                        sizeof(event) * (pevent->nr_events - i));
+
+        pevent->events[i] = event;
+        pevent->nr_events++;
+
+        event->pevent = pevent;
+}
+
+static int event_item_type(enum event_type type)
+{
+        switch (type) {
+        case EVENT_ITEM ... EVENT_SQUOTE:
+                return 1;
+        case EVENT_ERROR ... EVENT_DELIM:
+        default:
+                return 0;
+        }
+}
+
+static void free_flag_sym(struct print_flag_sym *fsym)
+{
+        struct print_flag_sym *next;
+
+        while (fsym) {
+                next = fsym->next;
+                free(fsym->value);
+                free(fsym->str);
+                free(fsym);
+                fsym = next;
+        }
+}
+
+static void free_arg(struct print_arg *arg)
+{
+        struct print_arg *farg;
+
+        if (!arg)
+                return;
+
+        switch (arg->type) {
+        case PRINT_ATOM:
+                free(arg->atom.atom);
+                break;
+        case PRINT_FIELD:
+                free(arg->field.name);
+                break;
+        case PRINT_FLAGS:
+                free_arg(arg->flags.field);
+                free(arg->flags.delim);
+                free_flag_sym(arg->flags.flags);
+                break;
+        case PRINT_SYMBOL:
+                free_arg(arg->symbol.field);
+                free_flag_sym(arg->symbol.symbols);
+                break;
+        case PRINT_TYPE:
+                free(arg->typecast.type);
+                free_arg(arg->typecast.item);
+                break;
+        case PRINT_STRING:
+        case PRINT_BSTRING:
+                free(arg->string.string);
+                break;
+        case PRINT_DYNAMIC_ARRAY:
+                free(arg->dynarray.index);
+                break;
+        case PRINT_OP:
+                free(arg->op.op);
+                free_arg(arg->op.left);
+                free_arg(arg->op.right);
+                break;
+        case PRINT_FUNC:
+                while (arg->func.args) {
+                        farg = arg->func.args;
+                        arg->func.args = farg->next;
+                        free_arg(farg);
+                }
+                break;
+
+        case PRINT_NULL:
+        default:
+                break;
+        }
+
+        free(arg);
+}
+
+static enum event_type get_type(int ch)
+{
+        if (ch == '\n')
+                return EVENT_NEWLINE;
+        if (isspace(ch))
+                return EVENT_SPACE;
+        if (isalnum(ch) || ch == '_')
+                return EVENT_ITEM;
+        if (ch == '\'')
+                return EVENT_SQUOTE;
+        if (ch == '"')
+                return EVENT_DQUOTE;
+        if (!isprint(ch))
+                return EVENT_NONE;
+        if (ch == '(' || ch == ')' || ch == ',')
+                return EVENT_DELIM;
+
+        return EVENT_OP;
+}
+
+static int __read_char(void)
+{
+        if (input_buf_ptr >= input_buf_siz)
+                return -1;
+
+        return input_buf[input_buf_ptr++];
+}
+
+static int __peek_char(void)
+{
+        if (input_buf_ptr >= input_buf_siz)
+                return -1;
+
+        return input_buf[input_buf_ptr];
+}
+
+/**
+ * pevent_peek_char - peek at the next character that will be read
+ *
+ * Returns the next character read, or -1 if end of buffer.
+ */
+int pevent_peek_char(void)
+{
+        return __peek_char();
+}
+
+static enum event_type force_token(const char *str, char **tok);
+
+static enum event_type __read_token(char **tok)
+{
+        char buf[BUFSIZ];
+        int ch, last_ch, quote_ch, next_ch;
+        int i = 0;
+        int tok_size = 0;
+        enum event_type type;
+
+        *tok = NULL;
+
+
+        ch = __read_char();
+        if (ch < 0)
+                return EVENT_NONE;
+
+        type = get_type(ch);
+        if (type == EVENT_NONE)
+                return type;
+
+        buf[i++] = ch;
+
+        switch (type) {
+        case EVENT_NEWLINE:
+        case EVENT_DELIM:
+                *tok = malloc_or_die(2);
+                (*tok)[0] = ch;
+                (*tok)[1] = 0;
+                return type;
+
+        case EVENT_OP:
+                switch (ch) {
+                case '-':
+                        next_ch = __peek_char();
+                        if (next_ch == '>') {
+                                buf[i++] = __read_char();
+                                break;
+                        }
+                        /* fall through */
+                case '+':
+                case '|':
+                case '&':
+                case '>':
+                case '<':
+                        last_ch = ch;
+                        ch = __peek_char();
+                        if (ch != last_ch)
+                                goto test_equal;
+                        buf[i++] = __read_char();
+                        switch (last_ch) {
+                        case '>':
+                        case '<':
+                                goto test_equal;
+                        default:
+                                break;
+                        }
+                        break;
+                case '!':
+                case '=':
+                        goto test_equal;
+                default: /* what should we do instead? */
+                        break;
+                }
+                buf[i] = 0;
+                *tok = strdup(buf);
+                return type;
+
+ test_equal:
+                ch = __peek_char();
+                if (ch == '=')
+                        buf[i++] = __read_char();
+                goto out;
+
+        case EVENT_DQUOTE:
+        case EVENT_SQUOTE:
+                /* don't keep quotes */
+                i--;
+                quote_ch = ch;
+                last_ch = 0;
+ concat:
+                do {
+                        if (i == (BUFSIZ - 1)) {
+                                buf[i] = 0;
+                                if (*tok) {
+                                        *tok = realloc(*tok, tok_size + BUFSIZ);
+                                        if (!*tok)
+                                                return EVENT_NONE;
+                                        strcat(*tok, buf);
+                                } else
+                                        *tok = strdup(buf);
+
+                                if (!*tok)
+                                        return EVENT_NONE;
+                                tok_size += BUFSIZ;
+                                i = 0;
+                        }
+                        last_ch = ch;
+                        ch = __read_char();
+                        buf[i++] = ch;
+                        /* the '\' '\' will cancel itself */
+                        if (ch == '\\' && last_ch == '\\')
+                                last_ch = 0;
+                } while (ch != quote_ch || last_ch == '\\');
+                /* remove the last quote */
+                i--;
+
+                /*
+                 * For strings (double quotes) check the next token.
+                 * If it is another string, concatinate the two.
+                 */
+                if (type == EVENT_DQUOTE) {
+                        unsigned long long save_input_buf_ptr = input_buf_ptr;
+
+                        do {
+                                ch = __read_char();
+                        } while (isspace(ch));
+                        if (ch == '"')
+                                goto concat;
+                        input_buf_ptr = save_input_buf_ptr;
+                }
+
+                goto out;
+
+        case EVENT_ERROR ... EVENT_SPACE:
+        case EVENT_ITEM:
+        default:
+                break;
+        }
+
+        while (get_type(__peek_char()) == type) {
+                if (i == (BUFSIZ - 1)) {
+                        buf[i] = 0;
+                        if (*tok) {
+                                *tok = realloc(*tok, tok_size + BUFSIZ);
+                                if (!*tok)
+                                        return EVENT_NONE;
+                                strcat(*tok, buf);
+                        } else
+                                *tok = strdup(buf);
+
+                        if (!*tok)
+                                return EVENT_NONE;
+                        tok_size += BUFSIZ;
+                        i = 0;
+                }
+                ch = __read_char();
+                buf[i++] = ch;
+        }
+
+ out:
+        buf[i] = 0;
+        if (*tok) {
+                *tok = realloc(*tok, tok_size + i);
+                if (!*tok)
+                        return EVENT_NONE;
+                strcat(*tok, buf);
+        } else
+                *tok = strdup(buf);
+        if (!*tok)
+                return EVENT_NONE;
+
+        if (type == EVENT_ITEM) {
+                /*
+                 * Older versions of the kernel has a bug that
+                 * creates invalid symbols and will break the mac80211
+                 * parsing. This is a work around to that bug.
+                 *
+                 * See Linux kernel commit:
+                 *  811cb50baf63461ce0bdb234927046131fc7fa8b
+                 */
+                if (strcmp(*tok, "LOCAL_PR_FMT") == 0) {
+                        free(*tok);
+                        *tok = NULL;
+                        return force_token("\"\%s\" ", tok);
+                } else if (strcmp(*tok, "STA_PR_FMT") == 0) {
+                        free(*tok);
+                        *tok = NULL;
+                        return force_token("\" sta:%pM\" ", tok);
+                } else if (strcmp(*tok, "VIF_PR_FMT") == 0) {
+                        free(*tok);
+                        *tok = NULL;
+                        return force_token("\" vif:%p(%d)\" ", tok);
+                }
+        }
+
+        return type;
+}
+
+static enum event_type force_token(const char *str, char **tok)
+{
+        const char *save_input_buf;
+        unsigned long long save_input_buf_ptr;
+        unsigned long long save_input_buf_siz;
+        enum event_type type;
+        
+        /* save off the current input pointers */
+        save_input_buf = input_buf;
+        save_input_buf_ptr = input_buf_ptr;
+        save_input_buf_siz = input_buf_siz;
+
+        init_input_buf(str, strlen(str));
+
+        type = __read_token(tok);
+
+        /* reset back to original token */
+        input_buf = save_input_buf;
+        input_buf_ptr = save_input_buf_ptr;
+        input_buf_siz = save_input_buf_siz;
+
+        return type;
+}
+
+static void free_token(char *tok)
+{
+        if (tok)
+                free(tok);
+}
+
+static enum event_type read_token(char **tok)
+{
+        enum event_type type;
+
+        for (;;) {
+                type = __read_token(tok);
+                if (type != EVENT_SPACE)
+                        return type;
+
+                free_token(*tok);
+        }
+
+        /* not reached */
+        *tok = NULL;
+        return EVENT_NONE;
+}
+
+/**
+ * pevent_read_token - access to utilites to use the pevent parser
+ * @tok: The token to return
+ *
+ * This will parse tokens from the string given by
+ * pevent_init_data().
+ *
+ * Returns the token type.
+ */
+enum event_type pevent_read_token(char **tok)
+{
+        return read_token(tok);
+}
+
+/**
+ * pevent_free_token - free a token returned by pevent_read_token
+ * @token: the token to free
+ */
+void pevent_free_token(char *token)
+{
+        free_token(token);
+}
+
+/* no newline */
+static enum event_type read_token_item(char **tok)
+{
+        enum event_type type;
+
+        for (;;) {
+                type = __read_token(tok);
+                if (type != EVENT_SPACE && type != EVENT_NEWLINE)
+                        return type;
+                free_token(*tok);
+                *tok = NULL;
+        }
+
+        /* not reached */
+        *tok = NULL;
+        return EVENT_NONE;
+}
+
+static int test_type(enum event_type type, enum event_type expect)
+{
+        if (type != expect) {
+                do_warning("Error: expected type %d but read %d",
+                    expect, type);
+                return -1;
+        }
+        return 0;
+}
+
+static int test_type_token(enum event_type type, const char *token,
+                    enum event_type expect, const char *expect_tok)
+{
+        if (type != expect) {
+                do_warning("Error: expected type %d but read %d",
+                    expect, type);
+                return -1;
+        }
+
+        if (strcmp(token, expect_tok) != 0) {
+                do_warning("Error: expected '%s' but read '%s'",
+                    expect_tok, token);
+                return -1;
+        }
+        return 0;
+}
+
+static int __read_expect_type(enum event_type expect, char **tok, int newline_ok)
+{
+        enum event_type type;
+
+        if (newline_ok)
+                type = read_token(tok);
+        else
+                type = read_token_item(tok);
+        return test_type(type, expect);
+}
+
+static int read_expect_type(enum event_type expect, char **tok)
+{
+        return __read_expect_type(expect, tok, 1);
+}
+
+static int __read_expected(enum event_type expect, const char *str,
+                           int newline_ok)
+{
+        enum event_type type;
+        char *token;
+        int ret;
+
+        if (newline_ok)
+                type = read_token(&token);
+        else
+                type = read_token_item(&token);
+
+        ret = test_type_token(type, token, expect, str);
+
+        free_token(token);
+
+        return ret;
+}
+
+static int read_expected(enum event_type expect, const char *str)
+{
+        return __read_expected(expect, str, 1);
+}
+
+static int read_expected_item(enum event_type expect, const char *str)
+{
+        return __read_expected(expect, str, 0);
+}
+
+static char *event_read_name(void)
+{
+        char *token;
+
+        if (read_expected(EVENT_ITEM, "name") < 0)
+                return NULL;
+
+        if (read_expected(EVENT_OP, ":") < 0)
+                return NULL;
+
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto fail;
+
+        return token;
+
+ fail:
+        free_token(token);
+        return NULL;
+}
+
+static int event_read_id(void)
+{
+        char *token;
+        int id;
+
+        if (read_expected_item(EVENT_ITEM, "ID") < 0)
+                return -1;
+
+        if (read_expected(EVENT_OP, ":") < 0)
+                return -1;
+
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto fail;
+
+        id = strtoul(token, NULL, 0);
+        free_token(token);
+        return id;
+
+ fail:
+        free_token(token);
+        return -1;
+}
+
+static int field_is_string(struct format_field *field)
+{
+        if ((field->flags & FIELD_IS_ARRAY) &&
+            (strstr(field->type, "char") || strstr(field->type, "u8") ||
+             strstr(field->type, "s8")))
+                return 1;
+
+        return 0;
+}
+
+static int field_is_dynamic(struct format_field *field)
+{
+        if (strncmp(field->type, "__data_loc", 10) == 0)
+                return 1;
+
+        return 0;
+}
+
+static int field_is_long(struct format_field *field)
+{
+        /* includes long long */
+        if (strstr(field->type, "long"))
+                return 1;
+
+        return 0;
+}
+
+static int event_read_fields(struct event_format *event, struct format_field **fields)
+{
+        struct format_field *field = NULL;
+        enum event_type type;
+        char *token;
+        char *last_token;
+        int count = 0;
+
+        do {
+                type = read_token(&token);
+                if (type == EVENT_NEWLINE) {
+                        free_token(token);
+                        return count;
+                }
+
+                count++;
+
+                if (test_type_token(type, token, EVENT_ITEM, "field"))
+                        goto fail;
+                free_token(token);
+
+                type = read_token(&token);
+                /*
+                 * The ftrace fields may still use the "special" name.
+                 * Just ignore it.
+                 */
+                if (event->flags & EVENT_FL_ISFTRACE &&
+                    type == EVENT_ITEM && strcmp(token, "special") == 0) {
+                        free_token(token);
+                        type = read_token(&token);
+                }
+
+                if (test_type_token(type, token, EVENT_OP, ":") < 0)
+                        goto fail;
+
+                free_token(token);
+                if (read_expect_type(EVENT_ITEM, &token) < 0)
+                        goto fail;
+
+                last_token = token;
+
+                field = malloc_or_die(sizeof(*field));
+                memset(field, 0, sizeof(*field));
+                field->event = event;
+
+                /* read the rest of the type */
+                for (;;) {
+                        type = read_token(&token);
+                        if (type == EVENT_ITEM ||
+                            (type == EVENT_OP && strcmp(token, "*") == 0) ||
+                            /*
+                             * Some of the ftrace fields are broken and have
+                             * an illegal "." in them.
+                             */
+                            (event->flags & EVENT_FL_ISFTRACE &&
+                             type == EVENT_OP && strcmp(token, ".") == 0)) {
+
+                                if (strcmp(token, "*") == 0)
+                                        field->flags |= FIELD_IS_POINTER;
+
+                                if (field->type) {
+                                        field->type = realloc(field->type,
+                                                              strlen(field->type) +
+                                                              strlen(last_token) + 2);
+                                        strcat(field->type, " ");
+                                        strcat(field->type, last_token);
+                                        free(last_token);
+                                } else
+                                        field->type = last_token;
+                                last_token = token;
+                                continue;
+                        }
+
+                        break;
+                }
+
+                if (!field->type) {
+                        die("no type found");
+                        goto fail;
+                }
+                field->name = last_token;
+
+                if (test_type(type, EVENT_OP))
+                        goto fail;
+
+                if (strcmp(token, "[") == 0) {
+                        enum event_type last_type = type;
+                        char *brackets = token;
+                        int len;
+
+                        field->flags |= FIELD_IS_ARRAY;
+
+                        type = read_token(&token);
+
+                        if (type == EVENT_ITEM)
+                                field->arraylen = strtoul(token, NULL, 0);
+                        else
+                                field->arraylen = 0;
+
+                        while (strcmp(token, "]") != 0) {
+                                if (last_type == EVENT_ITEM &&
+                                    type == EVENT_ITEM)
+                                        len = 2;
+                                else
+                                        len = 1;
+                                last_type = type;
+
+                                brackets = realloc(brackets,
+                                                   strlen(brackets) +
+                                                   strlen(token) + len);
+                                if (len == 2)
+                                        strcat(brackets, " ");
+                                strcat(brackets, token);
+                                /* We only care about the last token */
+                                field->arraylen = strtoul(token, NULL, 0);
+                                free_token(token);
+                                type = read_token(&token);
+                                if (type == EVENT_NONE) {
+                                        die("failed to find token");
+                                        goto fail;
+                                }
+                        }
+
+                        free_token(token);
+
+                        brackets = realloc(brackets, strlen(brackets) + 2);
+                        strcat(brackets, "]");
+
+                        /* add brackets to type */
+
+                        type = read_token(&token);
+                        /*
+                         * If the next token is not an OP, then it is of
+                         * the format: type [] item;
+                         */
+                        if (type == EVENT_ITEM) {
+                                field->type = realloc(field->type,
+                                                      strlen(field->type) +
+                                                      strlen(field->name) +
+                                                      strlen(brackets) + 2);
+                                strcat(field->type, " ");
+                                strcat(field->type, field->name);
+                                free_token(field->name);
+                                strcat(field->type, brackets);
+                                field->name = token;
+                                type = read_token(&token);
+                        } else {
+                                field->type = realloc(field->type,
+                                                      strlen(field->type) +
+                                                      strlen(brackets) + 1);
+                                strcat(field->type, brackets);
+                        }
+                        free(brackets);
+                }
+
+                if (field_is_string(field))
+                        field->flags |= FIELD_IS_STRING;
+                if (field_is_dynamic(field))
+                        field->flags |= FIELD_IS_DYNAMIC;
+                if (field_is_long(field))
+                        field->flags |= FIELD_IS_LONG;
+
+                if (test_type_token(type, token,  EVENT_OP, ";"))
+                        goto fail;
+                free_token(token);
+
+                if (read_expected(EVENT_ITEM, "offset") < 0)
+                        goto fail_expect;
+
+                if (read_expected(EVENT_OP, ":") < 0)
+                        goto fail_expect;
+
+                if (read_expect_type(EVENT_ITEM, &token))
+                        goto fail;
+                field->offset = strtoul(token, NULL, 0);
+                free_token(token);
+
+                if (read_expected(EVENT_OP, ";") < 0)
+                        goto fail_expect;
+
+                if (read_expected(EVENT_ITEM, "size") < 0)
+                        goto fail_expect;
+
+                if (read_expected(EVENT_OP, ":") < 0)
+                        goto fail_expect;
+
+                if (read_expect_type(EVENT_ITEM, &token))
+                        goto fail;
+                field->size = strtoul(token, NULL, 0);
+                free_token(token);
+
+                if (read_expected(EVENT_OP, ";") < 0)
+                        goto fail_expect;
+
+                type = read_token(&token);
+                if (type != EVENT_NEWLINE) {
+                        /* newer versions of the kernel have a "signed" type */
+                        if (test_type_token(type, token, EVENT_ITEM, "signed"))
+                                goto fail;
+
+                        free_token(token);
+
+                        if (read_expected(EVENT_OP, ":") < 0)
+                                goto fail_expect;
+
+                        if (read_expect_type(EVENT_ITEM, &token))
+                                goto fail;
+
+                        /* add signed type */
+
+                        free_token(token);
+                        if (read_expected(EVENT_OP, ";") < 0)
+                                goto fail_expect;
+
+                        if (read_expect_type(EVENT_NEWLINE, &token))
+                                goto fail;
+                }
+
+                free_token(token);
+
+                if (field->flags & FIELD_IS_ARRAY) {
+                        if (field->arraylen)
+                                field->elementsize = field->size / field->arraylen;
+                        else if (field->flags & FIELD_IS_STRING)
+                                field->elementsize = 1;
+                        else
+                                field->elementsize = event->pevent->long_size;
+                } else
+                        field->elementsize = field->size;
+
+                *fields = field;
+                fields = &field->next;
+
+        } while (1);
+
+        return 0;
+
+fail:
+        free_token(token);
+fail_expect:
+        if (field)
+                free(field);
+        return -1;
+}
+
+static int event_read_format(struct event_format *event)
+{
+        char *token;
+        int ret;
+
+        if (read_expected_item(EVENT_ITEM, "format") < 0)
+                return -1;
+
+        if (read_expected(EVENT_OP, ":") < 0)
+                return -1;
+
+        if (read_expect_type(EVENT_NEWLINE, &token))
+                goto fail;
+        free_token(token);
+
+        ret = event_read_fields(event, &event->format.common_fields);
+        if (ret < 0)
+                return ret;
+        event->format.nr_common = ret;
+
+        ret = event_read_fields(event, &event->format.fields);
+        if (ret < 0)
+                return ret;
+        event->format.nr_fields = ret;
+
+        return 0;
+
+ fail:
+        free_token(token);
+        return -1;
+}
+
+static enum event_type
+process_arg_token(struct event_format *event, struct print_arg *arg,
+                  char **tok, enum event_type type);
+
+static enum event_type
+process_arg(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        enum event_type type;
+        char *token;
+
+        type = read_token(&token);
+        *tok = token;
+
+        return process_arg_token(event, arg, tok, type);
+}
+
+static enum event_type
+process_op(struct event_format *event, struct print_arg *arg, char **tok);
+
+static enum event_type
+process_cond(struct event_format *event, struct print_arg *top, char **tok)
+{
+        struct print_arg *arg, *left, *right;
+        enum event_type type;
+        char *token = NULL;
+
+        arg = alloc_arg();
+        left = alloc_arg();
+        right = alloc_arg();
+
+        arg->type = PRINT_OP;
+        arg->op.left = left;
+        arg->op.right = right;
+
+        *tok = NULL;
+        type = process_arg(event, left, &token);
+
+ again:
+        /* Handle other operations in the arguments */
+        if (type == EVENT_OP && strcmp(token, ":") != 0) {
+                type = process_op(event, left, &token);
+                goto again;
+        }
+
+        if (test_type_token(type, token, EVENT_OP, ":"))
+                goto out_free;
+
+        arg->op.op = token;
+
+        type = process_arg(event, right, &token);
+
+        top->op.right = arg;
+
+        *tok = token;
+        return type;
+
+out_free:
+        /* Top may point to itself */
+        top->op.right = NULL;
+        free_token(token);
+        free_arg(arg);
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_array(struct event_format *event, struct print_arg *top, char **tok)
+{
+        struct print_arg *arg;
+        enum event_type type;
+        char *token = NULL;
+
+        arg = alloc_arg();
+
+        *tok = NULL;
+        type = process_arg(event, arg, &token);
+        if (test_type_token(type, token, EVENT_OP, "]"))
+                goto out_free;
+
+        top->op.right = arg;
+
+        free_token(token);
+        type = read_token_item(&token);
+        *tok = token;
+
+        return type;
+
+out_free:
+        free_token(*tok);
+        *tok = NULL;
+        free_arg(arg);
+        return EVENT_ERROR;
+}
+
+static int get_op_prio(char *op)
+{
+        if (!op[1]) {
+                switch (op[0]) {
+                case '~':
+                case '!':
+                        return 4;
+                case '*':
+                case '/':
+                case '%':
+                        return 6;
+                case '+':
+                case '-':
+                        return 7;
+                        /* '>>' and '<<' are 8 */
+                case '<':
+                case '>':
+                        return 9;
+                        /* '==' and '!=' are 10 */
+                case '&':
+                        return 11;
+                case '^':
+                        return 12;
+                case '|':
+                        return 13;
+                case '?':
+                        return 16;
+                default:
+                        die("unknown op '%c'", op[0]);
+                        return -1;
+                }
+        } else {
+                if (strcmp(op, "++") == 0 ||
+                    strcmp(op, "--") == 0) {
+                        return 3;
+                } else if (strcmp(op, ">>") == 0 ||
+                           strcmp(op, "<<") == 0) {
+                        return 8;
+                } else if (strcmp(op, ">=") == 0 ||
+                           strcmp(op, "<=") == 0) {
+                        return 9;
+                } else if (strcmp(op, "==") == 0 ||
+                           strcmp(op, "!=") == 0) {
+                        return 10;
+                } else if (strcmp(op, "&&") == 0) {
+                        return 14;
+                } else if (strcmp(op, "||") == 0) {
+                        return 15;
+                } else {
+                        die("unknown op '%s'", op);
+                        return -1;
+                }
+        }
+}
+
+static void set_op_prio(struct print_arg *arg)
+{
+
+        /* single ops are the greatest */
+        if (!arg->op.left || arg->op.left->type == PRINT_NULL) {
+                arg->op.prio = 0;
+                return;
+        }
+
+        arg->op.prio = get_op_prio(arg->op.op);
+}
+
+/* Note, *tok does not get freed, but will most likely be saved */
+static enum event_type
+process_op(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct print_arg *left, *right = NULL;
+        enum event_type type;
+        char *token;
+
+        /* the op is passed in via tok */
+        token = *tok;
+
+        if (arg->type == PRINT_OP && !arg->op.left) {
+                /* handle single op */
+                if (token[1]) {
+                        die("bad op token %s", token);
+                        goto out_free;
+                }
+                switch (token[0]) {
+                case '~':
+                case '!':
+                case '+':
+                case '-':
+                        break;
+                default:
+                        do_warning("bad op token %s", token);
+                        goto out_free;
+
+                }
+
+                /* make an empty left */
+                left = alloc_arg();
+                left->type = PRINT_NULL;
+                arg->op.left = left;
+
+                right = alloc_arg();
+                arg->op.right = right;
+
+                /* do not free the token, it belongs to an op */
+                *tok = NULL;
+                type = process_arg(event, right, tok);
+
+        } else if (strcmp(token, "?") == 0) {
+
+                left = alloc_arg();
+                /* copy the top arg to the left */
+                *left = *arg;
+
+                arg->type = PRINT_OP;
+                arg->op.op = token;
+                arg->op.left = left;
+                arg->op.prio = 0;
+
+                type = process_cond(event, arg, tok);
+
+        } else if (strcmp(token, ">>") == 0 ||
+                   strcmp(token, "<<") == 0 ||
+                   strcmp(token, "&") == 0 ||
+                   strcmp(token, "|") == 0 ||
+                   strcmp(token, "&&") == 0 ||
+                   strcmp(token, "||") == 0 ||
+                   strcmp(token, "-") == 0 ||
+                   strcmp(token, "+") == 0 ||
+                   strcmp(token, "*") == 0 ||
+                   strcmp(token, "^") == 0 ||
+                   strcmp(token, "/") == 0 ||
+                   strcmp(token, "<") == 0 ||
+                   strcmp(token, ">") == 0 ||
+                   strcmp(token, "==") == 0 ||
+                   strcmp(token, "!=") == 0) {
+
+                left = alloc_arg();
+
+                /* copy the top arg to the left */
+                *left = *arg;
+
+                arg->type = PRINT_OP;
+                arg->op.op = token;
+                arg->op.left = left;
+
+                set_op_prio(arg);
+
+                type = read_token_item(&token);
+                *tok = token;
+
+                /* could just be a type pointer */
+                if ((strcmp(arg->op.op, "*") == 0) &&
+                    type == EVENT_DELIM && (strcmp(token, ")") == 0)) {
+                        if (left->type != PRINT_ATOM)
+                                die("bad pointer type");
+                        left->atom.atom = realloc(left->atom.atom,
+                                            strlen(left->atom.atom) + 3);
+                        strcat(left->atom.atom, " *");
+                        free(arg->op.op);
+                        *arg = *left;
+                        free(left);
+
+                        return type;
+                }
+
+                right = alloc_arg();
+                type = process_arg_token(event, right, tok, type);
+                arg->op.right = right;
+
+        } else if (strcmp(token, "[") == 0) {
+
+                left = alloc_arg();
+                *left = *arg;
+
+                arg->type = PRINT_OP;
+                arg->op.op = token;
+                arg->op.left = left;
+
+                arg->op.prio = 0;
+
+                type = process_array(event, arg, tok);
+
+        } else {
+                do_warning("unknown op '%s'", token);
+                event->flags |= EVENT_FL_FAILED;
+                /* the arg is now the left side */
+                goto out_free;
+        }
+
+        if (type == EVENT_OP && strcmp(*tok, ":") != 0) {
+                int prio;
+
+                /* higher prios need to be closer to the root */
+                prio = get_op_prio(*tok);
+
+                if (prio > arg->op.prio)
+                        return process_op(event, arg, tok);
+
+                return process_op(event, right, tok);
+        }
+
+        return type;
+
+ out_free:
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_entry(struct event_format *event __unused, struct print_arg *arg,
+              char **tok)
+{
+        enum event_type type;
+        char *field;
+        char *token;
+
+        if (read_expected(EVENT_OP, "->") < 0)
+                goto out_err;
+
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto out_free;
+        field = token;
+
+        arg->type = PRINT_FIELD;
+        arg->field.name = field;
+
+        type = read_token(&token);
+        *tok = token;
+
+        return type;
+
+ out_free:
+        free_token(token);
+ out_err:
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static char *arg_eval (struct print_arg *arg);
+
+static unsigned long long
+eval_type_str(unsigned long long val, const char *type, int pointer)
+{
+        int sign = 0;
+        char *ref;
+        int len;
+
+        len = strlen(type);
+
+        if (pointer) {
+
+                if (type[len-1] != '*') {
+                        do_warning("pointer expected with non pointer type");
+                        return val;
+                }
+
+                ref = malloc_or_die(len);
+                memcpy(ref, type, len);
+
+                /* chop off the " *" */
+                ref[len - 2] = 0;
+
+                val = eval_type_str(val, ref, 0);
+                free(ref);
+                return val;
+        }
+
+        /* check if this is a pointer */
+        if (type[len - 1] == '*')
+                return val;
+
+        /* Try to figure out the arg size*/
+        if (strncmp(type, "struct", 6) == 0)
+                /* all bets off */
+                return val;
+
+        if (strcmp(type, "u8") == 0)
+                return val & 0xff;
+
+        if (strcmp(type, "u16") == 0)
+                return val & 0xffff;
+
+        if (strcmp(type, "u32") == 0)
+                return val & 0xffffffff;
+
+        if (strcmp(type, "u64") == 0 ||
+            strcmp(type, "s64"))
+                return val;
+
+        if (strcmp(type, "s8") == 0)
+                return (unsigned long long)(char)val & 0xff;
+
+        if (strcmp(type, "s16") == 0)
+                return (unsigned long long)(short)val & 0xffff;
+
+        if (strcmp(type, "s32") == 0)
+                return (unsigned long long)(int)val & 0xffffffff;
+
+        if (strncmp(type, "unsigned ", 9) == 0) {
+                sign = 0;
+                type += 9;
+        }
+
+        if (strcmp(type, "char") == 0) {
+                if (sign)
+                        return (unsigned long long)(char)val & 0xff;
+                else
+                        return val & 0xff;
+        }
+
+        if (strcmp(type, "short") == 0) {
+                if (sign)
+                        return (unsigned long long)(short)val & 0xffff;
+                else
+                        return val & 0xffff;
+        }
+
+        if (strcmp(type, "int") == 0) {
+                if (sign)
+                        return (unsigned long long)(int)val & 0xffffffff;
+                else
+                        return val & 0xffffffff;
+        }
+
+        return val;
+}
+
+/*
+ * Try to figure out the type.
+ */
+static unsigned long long
+eval_type(unsigned long long val, struct print_arg *arg, int pointer)
+{
+        if (arg->type != PRINT_TYPE)
+                die("expected type argument");
+
+        return eval_type_str(val, arg->typecast.type, pointer);
+}
+
+static long long arg_num_eval(struct print_arg *arg)
+{
+        long long left, right;
+        long long val = 0;
+
+        switch (arg->type) {
+        case PRINT_ATOM:
+                val = strtoll(arg->atom.atom, NULL, 0);
+                break;
+        case PRINT_TYPE:
+                val = arg_num_eval(arg->typecast.item);
+                val = eval_type(val, arg, 0);
+                break;
+        case PRINT_OP:
+                switch (arg->op.op[0]) {
+                case '|':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+                        if (arg->op.op[1])
+                                val = left || right;
+                        else
+                                val = left | right;
+                        break;
+                case '&':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+                        if (arg->op.op[1])
+                                val = left && right;
+                        else
+                                val = left & right;
+                        break;
+                case '<':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+                        switch (arg->op.op[1]) {
+                        case 0:
+                                val = left < right;
+                                break;
+                        case '<':
+                                val = left << right;
+                                break;
+                        case '=':
+                                val = left <= right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '>':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+                        switch (arg->op.op[1]) {
+                        case 0:
+                                val = left > right;
+                                break;
+                        case '>':
+                                val = left >> right;
+                                break;
+                        case '=':
+                                val = left >= right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '=':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+
+                        if (arg->op.op[1] != '=')
+                                die("unknown op '%s'", arg->op.op);
+
+                        val = left == right;
+                        break;
+                case '!':
+                        left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+
+                        switch (arg->op.op[1]) {
+                        case '=':
+                                val = left != right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '-':
+                        /* check for negative */
+                        if (arg->op.left->type == PRINT_NULL)
+                                left = 0;
+                        else
+                                left = arg_num_eval(arg->op.left);
+                        right = arg_num_eval(arg->op.right);
+                        val = left - right;
+                        break;
+                default:
+                        die("unknown op '%s'", arg->op.op);
+                }
+                break;
+
+        case PRINT_NULL:
+        case PRINT_FIELD ... PRINT_SYMBOL:
+        case PRINT_STRING:
+        case PRINT_BSTRING:
+        default:
+                die("invalid eval type %d", arg->type);
+
+        }
+        return val;
+}
+
+static char *arg_eval (struct print_arg *arg)
+{
+        long long val;
+        static char buf[20];
+
+        switch (arg->type) {
+        case PRINT_ATOM:
+                return arg->atom.atom;
+        case PRINT_TYPE:
+                return arg_eval(arg->typecast.item);
+        case PRINT_OP:
+                val = arg_num_eval(arg);
+                sprintf(buf, "%lld", val);
+                return buf;
+
+        case PRINT_NULL:
+        case PRINT_FIELD ... PRINT_SYMBOL:
+        case PRINT_STRING:
+        case PRINT_BSTRING:
+        default:
+                die("invalid eval type %d", arg->type);
+                break;
+        }
+
+        return NULL;
+}
+
+static enum event_type
+process_fields(struct event_format *event, struct print_flag_sym **list, char **tok)
+{
+        enum event_type type;
+        struct print_arg *arg = NULL;
+        struct print_flag_sym *field;
+        char *token = *tok;
+        char *value;
+
+        do {
+                free_token(token);
+                type = read_token_item(&token);
+                if (test_type_token(type, token, EVENT_OP, "{"))
+                        break;
+
+                arg = alloc_arg();
+
+                free_token(token);
+                type = process_arg(event, arg, &token);
+                if (test_type_token(type, token, EVENT_DELIM, ","))
+                        goto out_free;
+
+                field = malloc_or_die(sizeof(*field));
+                memset(field, 0, sizeof(field));
+
+                value = arg_eval(arg);
+                field->value = strdup(value);
+
+                free_arg(arg);
+                arg = alloc_arg();
+
+                free_token(token);
+                type = process_arg(event, arg, &token);
+                if (test_type_token(type, token, EVENT_OP, "}"))
+                        goto out_free;
+
+                value = arg_eval(arg);
+                field->str = strdup(value);
+                free_arg(arg);
+                arg = NULL;
+
+                *list = field;
+                list = &field->next;
+
+                free_token(token);
+                type = read_token_item(&token);
+        } while (type == EVENT_DELIM && strcmp(token, ",") == 0);
+
+        *tok = token;
+        return type;
+
+out_free:
+        free_arg(arg);
+        free_token(token);
+        *tok = NULL;
+
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_flags(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct print_arg *field;
+        enum event_type type;
+        char *token;
+
+        memset(arg, 0, sizeof(*arg));
+        arg->type = PRINT_FLAGS;
+
+        field = alloc_arg();
+
+        type = process_arg(event, field, &token);
+
+        /* Handle operations in the first argument */
+        while (type == EVENT_OP)
+                type = process_op(event, field, &token);
+
+        if (test_type_token(type, token, EVENT_DELIM, ","))
+                goto out_free;
+        free_token(token);
+
+        arg->flags.field = field;
+
+        type = read_token_item(&token);
+        if (event_item_type(type)) {
+                arg->flags.delim = token;
+                type = read_token_item(&token);
+        }
+
+        if (test_type_token(type, token, EVENT_DELIM, ","))
+                goto out_free;
+
+        type = process_fields(event, &arg->flags.flags, &token);
+        if (test_type_token(type, token, EVENT_DELIM, ")"))
+                goto out_free;
+
+        free_token(token);
+        type = read_token_item(tok);
+        return type;
+
+ out_free:
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct print_arg *field;
+        enum event_type type;
+        char *token;
+
+        memset(arg, 0, sizeof(*arg));
+        arg->type = PRINT_SYMBOL;
+
+        field = alloc_arg();
+
+        type = process_arg(event, field, &token);
+        if (test_type_token(type, token, EVENT_DELIM, ","))
+                goto out_free;
+
+        arg->symbol.field = field;
+
+        type = process_fields(event, &arg->symbol.symbols, &token);
+        if (test_type_token(type, token, EVENT_DELIM, ")"))
+                goto out_free;
+
+        free_token(token);
+        type = read_token_item(tok);
+        return type;
+
+ out_free:
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_dynamic_array(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct format_field *field;
+        enum event_type type;
+        char *token;
+
+        memset(arg, 0, sizeof(*arg));
+        arg->type = PRINT_DYNAMIC_ARRAY;
+
+        /*
+         * The item within the parenthesis is another field that holds
+         * the index into where the array starts.
+         */
+        type = read_token(&token);
+        *tok = token;
+        if (type != EVENT_ITEM)
+                goto out_free;
+
+        /* Find the field */
+
+        field = pevent_find_field(event, token);
+        if (!field)
+                goto out_free;
+
+        arg->dynarray.field = field;
+        arg->dynarray.index = 0;
+
+        if (read_expected(EVENT_DELIM, ")") < 0)
+                goto out_free;
+
+        free_token(token);
+        type = read_token_item(&token);
+        *tok = token;
+        if (type != EVENT_OP || strcmp(token, "[") != 0)
+                return type;
+
+        free_token(token);
+        arg = alloc_arg();
+        type = process_arg(event, arg, &token);
+        if (type == EVENT_ERROR)
+                goto out_free;
+
+        if (!test_type_token(type, token, EVENT_OP, "]"))
+                goto out_free;
+
+        free_token(token);
+        type = read_token_item(tok);
+        return type;
+
+ out_free:
+        free(arg);
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_paren(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        struct print_arg *item_arg;
+        enum event_type type;
+        char *token;
+
+        type = process_arg(event, arg, &token);
+
+        if (type == EVENT_ERROR)
+                goto out_free;
+
+        if (type == EVENT_OP)
+                type = process_op(event, arg, &token);
+
+        if (type == EVENT_ERROR)
+                goto out_free;
+
+        if (test_type_token(type, token, EVENT_DELIM, ")"))
+                goto out_free;
+
+        free_token(token);
+        type = read_token_item(&token);
+
+        /*
+         * If the next token is an item or another open paren, then
+         * this was a typecast.
+         */
+        if (event_item_type(type) ||
+            (type == EVENT_DELIM && strcmp(token, "(") == 0)) {
+
+                /* make this a typecast and contine */
+
+                /* prevous must be an atom */
+                if (arg->type != PRINT_ATOM)
+                        die("previous needed to be PRINT_ATOM");
+
+                item_arg = alloc_arg();
+
+                arg->type = PRINT_TYPE;
+                arg->typecast.type = arg->atom.atom;
+                arg->typecast.item = item_arg;
+                type = process_arg_token(event, item_arg, &token, type);
+
+        }
+
+        *tok = token;
+        return type;
+
+ out_free:
+        free_token(token);
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+
+static enum event_type
+process_str(struct event_format *event __unused, struct print_arg *arg, char **tok)
+{
+        enum event_type type;
+        char *token;
+
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto out_free;
+
+        arg->type = PRINT_STRING;
+        arg->string.string = token;
+        arg->string.offset = -1;
+
+        if (read_expected(EVENT_DELIM, ")") < 0)
+                goto out_err;
+
+        type = read_token(&token);
+        *tok = token;
+
+        return type;
+
+ out_free:
+        free_token(token);
+ out_err:
+        *tok = NULL;
+        return EVENT_ERROR;
+}
+
+static struct pevent_function_handler *
+find_func_handler(struct pevent *pevent, char *func_name)
+{
+        struct pevent_function_handler *func;
+
+        for (func = pevent->func_handlers; func; func = func->next) {
+                if (strcmp(func->name, func_name) == 0)
+                        break;
+        }
+
+        return func;
+}
+
+static void remove_func_handler(struct pevent *pevent, char *func_name)
+{
+        struct pevent_function_handler *func;
+        struct pevent_function_handler **next;
+
+        next = &pevent->func_handlers;
+        while ((func = *next)) {
+                if (strcmp(func->name, func_name) == 0) {
+                        *next = func->next;
+                        free_func_handle(func);
+                        break;
+                }
+                next = &func->next;
+        }
+}
+
+static enum event_type
+process_func_handler(struct event_format *event, struct pevent_function_handler *func,
+                     struct print_arg *arg, char **tok)
+{
+        struct print_arg **next_arg;
+        struct print_arg *farg;
+        enum event_type type;
+        char *token;
+        char *test;
+        int i;
+
+        arg->type = PRINT_FUNC;
+        arg->func.func = func;
+
+        *tok = NULL;
+
+        next_arg = &(arg->func.args);
+        for (i = 0; i < func->nr_args; i++) {
+                farg = alloc_arg();
+                type = process_arg(event, farg, &token);
+                if (i < (func->nr_args - 1))
+                        test = ",";
+                else
+                        test = ")";
+
+                if (test_type_token(type, token, EVENT_DELIM, test)) {
+                        free_arg(farg);
+                        free_token(token);
+                        return EVENT_ERROR;
+                }
+
+                *next_arg = farg;
+                next_arg = &(farg->next);
+                free_token(token);
+        }
+
+        type = read_token(&token);
+        *tok = token;
+
+        return type;
+}
+
+static enum event_type
+process_function(struct event_format *event, struct print_arg *arg,
+                 char *token, char **tok)
+{
+        struct pevent_function_handler *func;
+
+        if (strcmp(token, "__print_flags") == 0) {
+                free_token(token);
+                return process_flags(event, arg, tok);
+        }
+        if (strcmp(token, "__print_symbolic") == 0) {
+                free_token(token);
+                return process_symbols(event, arg, tok);
+        }
+        if (strcmp(token, "__get_str") == 0) {
+                free_token(token);
+                return process_str(event, arg, tok);
+        }
+        if (strcmp(token, "__get_dynamic_array") == 0) {
+                free_token(token);
+                return process_dynamic_array(event, arg, tok);
+        }
+
+        func = find_func_handler(event->pevent, token);
+        if (func) {
+                free_token(token);
+                return process_func_handler(event, func, arg, tok);
+        }
+
+        do_warning("function %s not defined", token);
+        free_token(token);
+        return EVENT_ERROR;
+}
+
+static enum event_type
+process_arg_token(struct event_format *event, struct print_arg *arg,
+                  char **tok, enum event_type type)
+{
+        char *token;
+        char *atom;
+
+        token = *tok;
+
+        switch (type) {
+        case EVENT_ITEM:
+                if (strcmp(token, "REC") == 0) {
+                        free_token(token);
+                        type = process_entry(event, arg, &token);
+                        break;
+                }
+                atom = token;
+                /* test the next token */
+                type = read_token_item(&token);
+
+                /*
+                 * If the next token is a parenthesis, then this
+                 * is a function.
+                 */
+                if (type == EVENT_DELIM && strcmp(token, "(") == 0) {
+                        free_token(token);
+                        token = NULL;
+                        /* this will free atom. */
+                        type = process_function(event, arg, atom, &token);
+                        break;
+                }
+                /* atoms can be more than one token long */
+                while (type == EVENT_ITEM) {
+                        atom = realloc(atom, strlen(atom) + strlen(token) + 2);
+                        strcat(atom, " ");
+                        strcat(atom, token);
+                        free_token(token);
+                        type = read_token_item(&token);
+                }
+
+                arg->type = PRINT_ATOM;
+                arg->atom.atom = atom;
+                break;
+
+        case EVENT_DQUOTE:
+        case EVENT_SQUOTE:
+                arg->type = PRINT_ATOM;
+                arg->atom.atom = token;
+                type = read_token_item(&token);
+                break;
+        case EVENT_DELIM:
+                if (strcmp(token, "(") == 0) {
+                        free_token(token);
+                        type = process_paren(event, arg, &token);
+                        break;
+                }
+        case EVENT_OP:
+                /* handle single ops */
+                arg->type = PRINT_OP;
+                arg->op.op = token;
+                arg->op.left = NULL;
+                type = process_op(event, arg, &token);
+
+                /* On error, the op is freed */
+                if (type == EVENT_ERROR)
+                        arg->op.op = NULL;
+
+                /* return error type if errored */
+                break;
+
+        case EVENT_ERROR ... EVENT_NEWLINE:
+        default:
+                die("unexpected type %d", type);
+        }
+        *tok = token;
+
+        return type;
+}
+
+static int event_read_print_args(struct event_format *event, struct print_arg **list)
+{
+        enum event_type type = EVENT_ERROR;
+        struct print_arg *arg;
+        char *token;
+        int args = 0;
+
+        do {
+                if (type == EVENT_NEWLINE) {
+                        type = read_token_item(&token);
+                        continue;
+                }
+
+                arg = alloc_arg();
+
+                type = process_arg(event, arg, &token);
+
+                if (type == EVENT_ERROR) {
+                        free_token(token);
+                        free_arg(arg);
+                        return -1;
+                }
+
+                *list = arg;
+                args++;
+
+                if (type == EVENT_OP) {
+                        type = process_op(event, arg, &token);
+                        free_token(token);
+                        if (type == EVENT_ERROR) {
+                                *list = NULL;
+                                free_arg(arg);
+                                return -1;
+                        }
+                        list = &arg->next;
+                        continue;
+                }
+
+                if (type == EVENT_DELIM && strcmp(token, ",") == 0) {
+                        free_token(token);
+                        *list = arg;
+                        list = &arg->next;
+                        continue;
+                }
+                break;
+        } while (type != EVENT_NONE);
+
+        if (type != EVENT_NONE && type != EVENT_ERROR)
+                free_token(token);
+
+        return args;
+}
+
+static int event_read_print(struct event_format *event)
+{
+        enum event_type type;
+        char *token;
+        int ret;
+
+        if (read_expected_item(EVENT_ITEM, "print") < 0)
+                return -1;
+
+        if (read_expected(EVENT_ITEM, "fmt") < 0)
+                return -1;
+
+        if (read_expected(EVENT_OP, ":") < 0)
+                return -1;
+
+        if (read_expect_type(EVENT_DQUOTE, &token) < 0)
+                goto fail;
+
+ concat:
+        event->print_fmt.format = token;
+        event->print_fmt.args = NULL;
+
+        /* ok to have no arg */
+        type = read_token_item(&token);
+
+        if (type == EVENT_NONE)
+                return 0;
+
+        /* Handle concatenation of print lines */
+        if (type == EVENT_DQUOTE) {
+                char *cat;
+
+                cat = malloc_or_die(strlen(event->print_fmt.format) +
+                                    strlen(token) + 1);
+                strcpy(cat, event->print_fmt.format);
+                strcat(cat, token);
+                free_token(token);
+                free_token(event->print_fmt.format);
+                event->print_fmt.format = NULL;
+                token = cat;
+                goto concat;
+        }
+                             
+        if (test_type_token(type, token, EVENT_DELIM, ","))
+                goto fail;
+
+        free_token(token);
+
+        ret = event_read_print_args(event, &event->print_fmt.args);
+        if (ret < 0)
+                return -1;
+
+        return ret;
+
+ fail:
+        free_token(token);
+        return -1;
+}
+
+/**
+ * pevent_find_common_field - return a common field by event
+ * @event: handle for the event
+ * @name: the name of the common field to return
+ *
+ * Returns a common field from the event by the given @name.
+ * This only searchs the common fields and not all field.
+ */
+struct format_field *
+pevent_find_common_field(struct event_format *event, const char *name)
+{
+        struct format_field *format;
+
+        for (format = event->format.common_fields;
+             format; format = format->next) {
+                if (strcmp(format->name, name) == 0)
+                        break;
+        }
+
+        return format;
+}
+
+/**
+ * pevent_find_field - find a non-common field
+ * @event: handle for the event
+ * @name: the name of the non-common field
+ *
+ * Returns a non-common field by the given @name.
+ * This does not search common fields.
+ */
+struct format_field *
+pevent_find_field(struct event_format *event, const char *name)
+{
+        struct format_field *format;
+
+        for (format = event->format.fields;
+             format; format = format->next) {
+                if (strcmp(format->name, name) == 0)
+                        break;
+        }
+
+        return format;
+}
+
+/**
+ * pevent_find_any_field - find any field by name
+ * @event: handle for the event
+ * @name: the name of the field
+ *
+ * Returns a field by the given @name.
+ * This searchs the common field names first, then
+ * the non-common ones if a common one was not found.
+ */
+struct format_field *
+pevent_find_any_field(struct event_format *event, const char *name)
+{
+        struct format_field *format;
+
+        format = pevent_find_common_field(event, name);
+        if (format)
+                return format;
+        return pevent_find_field(event, name);
+}
+
+/**
+ * pevent_read_number - read a number from data
+ * @pevent: handle for the pevent
+ * @ptr: the raw data
+ * @size: the size of the data that holds the number
+ *
+ * Returns the number (converted to host) from the
+ * raw data.
+ */
+unsigned long long pevent_read_number(struct pevent *pevent,
+                                      const void *ptr, int size)
+{
+        switch (size) {
+        case 1:
+                return *(unsigned char *)ptr;
+        case 2:
+                return data2host2(pevent, ptr);
+        case 4:
+                return data2host4(pevent, ptr);
+        case 8:
+                return data2host8(pevent, ptr);
+        default:
+                /* BUG! */
+                return 0;
+        }
+}
+
+/**
+ * pevent_read_number_field - read a number from data
+ * @field: a handle to the field
+ * @data: the raw data to read
+ * @value: the value to place the number in
+ *
+ * Reads raw data according to a field offset and size,
+ * and translates it into @value.
+ *
+ * Returns 0 on success, -1 otherwise.
+ */
+int pevent_read_number_field(struct format_field *field, const void *data,
+                             unsigned long long *value)
+{
+        if (!field)
+                return -1;
+        switch (field->size) {
+        case 1:
+        case 2:
+        case 4:
+        case 8:
+                *value = pevent_read_number(field->event->pevent,
+                                            data + field->offset, field->size);
+                return 0;
+        default:
+                return -1;
+        }
+}
+
+static int get_common_info(struct pevent *pevent,
+                           const char *type, int *offset, int *size)
+{
+        struct event_format *event;
+        struct format_field *field;
+
+        /*
+         * All events should have the same common elements.
+         * Pick any event to find where the type is;
+         */
+        if (!pevent->events)
+                die("no event_list!");
+
+        event = pevent->events[0];
+        field = pevent_find_common_field(event, type);
+        if (!field)
+                die("field '%s' not found", type);
+
+        *offset = field->offset;
+        *size = field->size;
+
+        return 0;
+}
+
+static int __parse_common(struct pevent *pevent, void *data,
+                          int *size, int *offset, const char *name)
+{
+        int ret;
+
+        if (!*size) {
+                ret = get_common_info(pevent, name, offset, size);
+                if (ret < 0)
+                        return ret;
+        }
+        return pevent_read_number(pevent, data + *offset, *size);
+}
+
+static int trace_parse_common_type(struct pevent *pevent, void *data)
+{
+        return __parse_common(pevent, data,
+                              &pevent->type_size, &pevent->type_offset,
+                              "common_type");
+}
+
+static int parse_common_pid(struct pevent *pevent, void *data)
+{
+        return __parse_common(pevent, data,
+                              &pevent->pid_size, &pevent->pid_offset,
+                              "common_pid");
+}
+
+static int parse_common_pc(struct pevent *pevent, void *data)
+{
+        return __parse_common(pevent, data,
+                              &pevent->pc_size, &pevent->pc_offset,
+                              "common_preempt_count");
+}
+
+static int parse_common_flags(struct pevent *pevent, void *data)
+{
+        return __parse_common(pevent, data,
+                              &pevent->flags_size, &pevent->flags_offset,
+                              "common_flags");
+}
+
+static int parse_common_lock_depth(struct pevent *pevent, void *data)
+{
+        int ret;
+
+        ret = __parse_common(pevent, data,
+                             &pevent->ld_size, &pevent->ld_offset,
+                             "common_lock_depth");
+        if (ret < 0)
+                return -1;
+
+        return ret;
+}
+
+static int events_id_cmp(const void *a, const void *b);
+
+/**
+ * pevent_find_event - find an event by given id
+ * @pevent: a handle to the pevent
+ * @id: the id of the event
+ *
+ * Returns an event that has a given @id.
+ */
+struct event_format *pevent_find_event(struct pevent *pevent, int id)
+{
+        struct event_format **eventptr;
+        struct event_format key;
+        struct event_format *pkey = &key;
+
+        /* Check cache first */
+        if (pevent->last_event && pevent->last_event->id == id)
+                return pevent->last_event;
+
+        key.id = id;
+
+        eventptr = bsearch(&pkey, pevent->events, pevent->nr_events,
+                           sizeof(*pevent->events), events_id_cmp);
+
+        if (eventptr) {
+                pevent->last_event = *eventptr;
+                return *eventptr;
+        }
+
+        return NULL;
+}
+
+/**
+ * pevent_find_event_by_name - find an event by given name
+ * @pevent: a handle to the pevent
+ * @sys: the system name to search for
+ * @name: the name of the event to search for
+ *
+ * This returns an event with a given @name and under the system
+ * @sys. If @sys is NULL the first event with @name is returned.
+ */
+struct event_format *
+pevent_find_event_by_name(struct pevent *pevent,
+                          const char *sys, const char *name)
+{
+        struct event_format *event;
+        int i;
+
+        if (pevent->last_event &&
+            strcmp(pevent->last_event->name, name) == 0 &&
+            (!sys || strcmp(pevent->last_event->system, sys) == 0))
+                return pevent->last_event;
+
+        for (i = 0; i < pevent->nr_events; i++) {
+                event = pevent->events[i];
+                if (strcmp(event->name, name) == 0) {
+                        if (!sys)
+                                break;
+                        if (strcmp(event->system, sys) == 0)
+                                break;
+                }
+        }
+        if (i == pevent->nr_events)
+                event = NULL;
+
+        pevent->last_event = event;
+        return event;
+}
+
+static unsigned long long
+eval_num_arg(void *data, int size, struct event_format *event, struct print_arg *arg)
+{
+        struct pevent *pevent = event->pevent;
+        unsigned long long val = 0;
+        unsigned long long left, right;
+        struct print_arg *typearg = NULL;
+        struct print_arg *larg;
+        unsigned long offset;
+        unsigned int field_size;
+
+        switch (arg->type) {
+        case PRINT_NULL:
+                /* ?? */
+                return 0;
+        case PRINT_ATOM:
+                return strtoull(arg->atom.atom, NULL, 0);
+        case PRINT_FIELD:
+                if (!arg->field.field) {
+                        arg->field.field = pevent_find_any_field(event, arg->field.name);
+                        if (!arg->field.field)
+                                die("field %s not found", arg->field.name);
+                }
+                /* must be a number */
+                val = pevent_read_number(pevent, data + arg->field.field->offset,
+                                arg->field.field->size);
+                break;
+        case PRINT_FLAGS:
+        case PRINT_SYMBOL:
+                break;
+        case PRINT_TYPE:
+                val = eval_num_arg(data, size, event, arg->typecast.item);
+                return eval_type(val, arg, 0);
+        case PRINT_STRING:
+        case PRINT_BSTRING:
+                return 0;
+        case PRINT_FUNC: {
+                struct trace_seq s;
+                trace_seq_init(&s);
+                val = process_defined_func(&s, data, size, event, arg);
+                trace_seq_destroy(&s);
+                return val;
+        }
+        case PRINT_OP:
+                if (strcmp(arg->op.op, "[") == 0) {
+                        /*
+                         * Arrays are special, since we don't want
+                         * to read the arg as is.
+                         */
+                        right = eval_num_arg(data, size, event, arg->op.right);
+
+                        /* handle typecasts */
+                        larg = arg->op.left;
+                        while (larg->type == PRINT_TYPE) {
+                                if (!typearg)
+                                        typearg = larg;
+                                larg = larg->typecast.item;
+                        }
+
+                        /* Default to long size */
+                        field_size = pevent->long_size;
+
+                        switch (larg->type) {
+                        case PRINT_DYNAMIC_ARRAY:
+                                offset = pevent_read_number(pevent,
+                                                   data + larg->dynarray.field->offset,
+                                                   larg->dynarray.field->size);
+                                if (larg->dynarray.field->elementsize)
+                                        field_size = larg->dynarray.field->elementsize;
+                                /*
+                                 * The actual length of the dynamic array is stored
+                                 * in the top half of the field, and the offset
+                                 * is in the bottom half of the 32 bit field.
+                                 */
+                                offset &= 0xffff;
+                                offset += right;
+                                break;
+                        case PRINT_FIELD:
+                                if (!larg->field.field) {
+                                        larg->field.field =
+                                                pevent_find_any_field(event, larg->field.name);
+                                        if (!larg->field.field)
+                                                die("field %s not found", larg->field.name);
+                                }
+                                field_size = larg->field.field->elementsize;
+                                offset = larg->field.field->offset +
+                                        right * larg->field.field->elementsize;
+                                break;
+                        default:
+                                goto default_op; /* oops, all bets off */
+                        }
+                        val = pevent_read_number(pevent,
+                                                 data + offset, field_size);
+                        if (typearg)
+                                val = eval_type(val, typearg, 1);
+                        break;
+                } else if (strcmp(arg->op.op, "?") == 0) {
+                        left = eval_num_arg(data, size, event, arg->op.left);
+                        arg = arg->op.right;
+                        if (left)
+                                val = eval_num_arg(data, size, event, arg->op.left);
+                        else
+                                val = eval_num_arg(data, size, event, arg->op.right);
+                        break;
+                }
+ default_op:
+                left = eval_num_arg(data, size, event, arg->op.left);
+                right = eval_num_arg(data, size, event, arg->op.right);
+                switch (arg->op.op[0]) {
+                case '!':
+                        switch (arg->op.op[1]) {
+                        case 0:
+                                val = !right;
+                                break;
+                        case '=':
+                                val = left != right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '~':
+                        val = ~right;
+                        break;
+                case '|':
+                        if (arg->op.op[1])
+                                val = left || right;
+                        else
+                                val = left | right;
+                        break;
+                case '&':
+                        if (arg->op.op[1])
+                                val = left && right;
+                        else
+                                val = left & right;
+                        break;
+                case '<':
+                        switch (arg->op.op[1]) {
+                        case 0:
+                                val = left < right;
+                                break;
+                        case '<':
+                                val = left << right;
+                                break;
+                        case '=':
+                                val = left <= right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '>':
+                        switch (arg->op.op[1]) {
+                        case 0:
+                                val = left > right;
+                                break;
+                        case '>':
+                                val = left >> right;
+                                break;
+                        case '=':
+                                val = left >= right;
+                                break;
+                        default:
+                                die("unknown op '%s'", arg->op.op);
+                        }
+                        break;
+                case '=':
+                        if (arg->op.op[1] != '=')
+                                die("unknown op '%s'", arg->op.op);
+                        val = left == right;
+                        break;
+                case '-':
+                        val = left - right;
+                        break;
+                case '+':
+                        val = left + right;
+                        break;
+                default:
+                        die("unknown op '%s'", arg->op.op);
+                }
+                break;
+        default: /* not sure what to do there */
+                return 0;
+        }
+        return val;
+}
+
+struct flag {
+        const char *name;
+        unsigned long long value;
+};
+
+static const struct flag flags[] = {
+        { "HI_SOFTIRQ", 0 },
+        { "TIMER_SOFTIRQ", 1 },
+        { "NET_TX_SOFTIRQ", 2 },
+        { "NET_RX_SOFTIRQ", 3 },
+        { "BLOCK_SOFTIRQ", 4 },
+        { "BLOCK_IOPOLL_SOFTIRQ", 5 },
+        { "TASKLET_SOFTIRQ", 6 },
+        { "SCHED_SOFTIRQ", 7 },
+        { "HRTIMER_SOFTIRQ", 8 },
+        { "RCU_SOFTIRQ", 9 },
+
+        { "HRTIMER_NORESTART", 0 },
+        { "HRTIMER_RESTART", 1 },
+};
+
+static unsigned long long eval_flag(const char *flag)
+{
+        int i;
+
+        /*
+         * Some flags in the format files do not get converted.
+         * If the flag is not numeric, see if it is something that
+         * we already know about.
+         */
+        if (isdigit(flag[0]))
+                return strtoull(flag, NULL, 0);
+
+        for (i = 0; i < (int)(sizeof(flags)/sizeof(flags[0])); i++)
+                if (strcmp(flags[i].name, flag) == 0)
+                        return flags[i].value;
+
+        return 0;
+}
+
+static void print_str_to_seq(struct trace_seq *s, const char *format,
+                             int len_arg, const char *str)
+{
+        if (len_arg >= 0)
+                trace_seq_printf(s, format, len_arg, str);
+        else
+                trace_seq_printf(s, format, str);
+}
+
+static void print_str_arg(struct trace_seq *s, void *data, int size,
+                          struct event_format *event, const char *format,
+                          int len_arg, struct print_arg *arg)
+{
+        struct pevent *pevent = event->pevent;
+        struct print_flag_sym *flag;
+        unsigned long long val, fval;
+        unsigned long addr;
+        char *str;
+        int print;
+        int len;
+
+        switch (arg->type) {
+        case PRINT_NULL:
+                /* ?? */
+                return;
+        case PRINT_ATOM:
+                print_str_to_seq(s, format, len_arg, arg->atom.atom);
+                return;
+        case PRINT_FIELD:
+                if (!arg->field.field) {
+                        arg->field.field = pevent_find_any_field(event, arg->field.name);
+                        if (!arg->field.field)
+                                die("field %s not found", arg->field.name);
+                }
+                /* Zero sized fields, mean the rest of the data */
+                len = arg->field.field->size ? : size - arg->field.field->offset;
+
+                /*
+                 * Some events pass in pointers. If this is not an array
+                 * and the size is the same as long_size, assume that it
+                 * is a pointer.
+                 */
+                if (!(arg->field.field->flags & FIELD_IS_ARRAY) &&
+                    arg->field.field->size == pevent->long_size) {
+                        addr = *(unsigned long *)(data + arg->field.field->offset);
+                        trace_seq_printf(s, "%lx", addr);
+                        break;
+                }
+                str = malloc_or_die(len + 1);
+                memcpy(str, data + arg->field.field->offset, len);
+                str[len] = 0;
+                print_str_to_seq(s, format, len_arg, str);
+                free(str);
+                break;
+        case PRINT_FLAGS:
+                val = eval_num_arg(data, size, event, arg->flags.field);
+                print = 0;
+                for (flag = arg->flags.flags; flag; flag = flag->next) {
+                        fval = eval_flag(flag->value);
+                        if (!val && !fval) {
+                                print_str_to_seq(s, format, len_arg, flag->str);
+                                break;
+                        }
+                        if (fval && (val & fval) == fval) {
+                                if (print && arg->flags.delim)
+                                        trace_seq_puts(s, arg->flags.delim);
+                                print_str_to_seq(s, format, len_arg, flag->str);
+                                print = 1;
+                                val &= ~fval;
+                        }
+                }
+                break;
+        case PRINT_SYMBOL:
+                val = eval_num_arg(data, size, event, arg->symbol.field);
+                for (flag = arg->symbol.symbols; flag; flag = flag->next) {
+                        fval = eval_flag(flag->value);
+                        if (val == fval) {
+                                print_str_to_seq(s, format, len_arg, flag->str);
+                                break;
+                        }
+                }
+                break;
+
+        case PRINT_TYPE:
+                break;
+        case PRINT_STRING: {
+                int str_offset;
+
+                if (arg->string.offset == -1) {
+                        struct format_field *f;
+
+                        f = pevent_find_any_field(event, arg->string.string);
+                        arg->string.offset = f->offset;
+                }
+                str_offset = data2host4(pevent, data + arg->string.offset);
+                str_offset &= 0xffff;
+                print_str_to_seq(s, format, len_arg, ((char *)data) + str_offset);
+                break;
+        }
+        case PRINT_BSTRING:
+                trace_seq_printf(s, format, arg->string.string);
+                break;
+        case PRINT_OP:
+                /*
+                 * The only op for string should be ? :
+                 */
+                if (arg->op.op[0] != '?')
+                        return;
+                val = eval_num_arg(data, size, event, arg->op.left);
+                if (val)
+                        print_str_arg(s, data, size, event,
+                                      format, len_arg, arg->op.right->op.left);
+                else
+                        print_str_arg(s, data, size, event,
+                                      format, len_arg, arg->op.right->op.right);
+                break;
+        case PRINT_FUNC:
+                process_defined_func(s, data, size, event, arg);
+                break;
+        default:
+                /* well... */
+                break;
+        }
+}
+
+static unsigned long long
+process_defined_func(struct trace_seq *s, void *data, int size,
+                     struct event_format *event, struct print_arg *arg)
+{
+        struct pevent_function_handler *func_handle = arg->func.func;
+        struct pevent_func_params *param;
+        unsigned long long *args;
+        unsigned long long ret;
+        struct print_arg *farg;
+        struct trace_seq str;
+        struct save_str {
+                struct save_str *next;
+                char *str;
+        } *strings = NULL, *string;
+        int i;
+
+        if (!func_handle->nr_args) {
+                ret = (*func_handle->func)(s, NULL);
+                goto out;
+        }
+
+        farg = arg->func.args;
+        param = func_handle->params;
+
+        args = malloc_or_die(sizeof(*args) * func_handle->nr_args);
+        for (i = 0; i < func_handle->nr_args; i++) {
+                switch (param->type) {
+                case PEVENT_FUNC_ARG_INT:
+                case PEVENT_FUNC_ARG_LONG:
+                case PEVENT_FUNC_ARG_PTR:
+                        args[i] = eval_num_arg(data, size, event, farg);
+                        break;
+                case PEVENT_FUNC_ARG_STRING:
+                        trace_seq_init(&str);
+                        print_str_arg(&str, data, size, event, "%s", -1, farg);
+                        trace_seq_terminate(&str);
+                        string = malloc_or_die(sizeof(*string));
+                        string->next = strings;
+                        string->str = strdup(str.buffer);
+                        strings = string;
+                        trace_seq_destroy(&str);
+                        break;
+                default:
+                        /*
+                         * Something went totally wrong, this is not
+                         * an input error, something in this code broke.
+                         */
+                        die("Unexpected end of arguments\n");
+                        break;
+                }
+                farg = farg->next;
+        }
+
+        ret = (*func_handle->func)(s, args);
+        free(args);
+        while (strings) {
+                string = strings;
+                strings = string->next;
+                free(string->str);
+                free(string);
+        }
+
+ out:
+        /* TBD : handle return type here */
+        return ret;
+}
+
+static struct print_arg *make_bprint_args(char *fmt, void *data, int size, struct event_format *event)
+{
+        struct pevent *pevent = event->pevent;
+        struct format_field *field, *ip_field;
+        struct print_arg *args, *arg, **next;
+        unsigned long long ip, val;
+        char *ptr;
+        void *bptr;
+
+        field = pevent->bprint_buf_field;
+        ip_field = pevent->bprint_ip_field;
+
+        if (!field) {
+                field = pevent_find_field(event, "buf");
+                if (!field)
+                        die("can't find buffer field for binary printk");
+                ip_field = pevent_find_field(event, "ip");
+                if (!ip_field)
+                        die("can't find ip field for binary printk");
+                pevent->bprint_buf_field = field;
+                pevent->bprint_ip_field = ip_field;
+        }
+
+        ip = pevent_read_number(pevent, data + ip_field->offset, ip_field->size);
+
+        /*
+         * The first arg is the IP pointer.
+         */
+        args = alloc_arg();
+        arg = args;
+        arg->next = NULL;
+        next = &arg->next;
+
+        arg->type = PRINT_ATOM;
+        arg->atom.atom = malloc_or_die(32);
+        sprintf(arg->atom.atom, "%lld", ip);
+
+        /* skip the first "%pf : " */
+        for (ptr = fmt + 6, bptr = data + field->offset;
+             bptr < data + size && *ptr; ptr++) {
+                int ls = 0;
+
+                if (*ptr == '%') {
+ process_again:
+                        ptr++;
+                        switch (*ptr) {
+                        case '%':
+                                break;
+                        case 'l':
+                                ls++;
+                                goto process_again;
+                        case 'L':
+                                ls = 2;
+                                goto process_again;
+                        case '0' ... '9':
+                                goto process_again;
+                        case 'p':
+                                ls = 1;
+                                /* fall through */
+                        case 'd':
+                        case 'u':
+                        case 'x':
+                        case 'i':
+                                /* the pointers are always 4 bytes aligned */
+                                bptr = (void *)(((unsigned long)bptr + 3) &
+                                                ~3);
+                                switch (ls) {
+                                case 0:
+                                        ls = 4;
+                                        break;
+                                case 1:
+                                        ls = pevent->long_size;
+                                        break;
+                                case 2:
+                                        ls = 8;
+                                default:
+                                        break;
+                                }
+                                val = pevent_read_number(pevent, bptr, ls);
+                                bptr += ls;
+                                arg = alloc_arg();
+                                arg->next = NULL;
+                                arg->type = PRINT_ATOM;
+                                arg->atom.atom = malloc_or_die(32);
+                                sprintf(arg->atom.atom, "%lld", val);
+                                *next = arg;
+                                next = &arg->next;
+                                break;
+                        case 's':
+                                arg = alloc_arg();
+                                arg->next = NULL;
+                                arg->type = PRINT_BSTRING;
+                                arg->string.string = strdup(bptr);
+                                bptr += strlen(bptr) + 1;
+                                *next = arg;
+                                next = &arg->next;
+                        default:
+                                break;
+                        }
+                }
+        }
+
+        return args;
+}
+
+static void free_args(struct print_arg *args)
+{
+        struct print_arg *next;
+
+        while (args) {
+                next = args->next;
+
+                free_arg(args);
+                args = next;
+        }
+}
+
+static char *
+get_bprint_format(void *data, int size __unused, struct event_format *event)
+{
+        struct pevent *pevent = event->pevent;
+        unsigned long long addr;
+        struct format_field *field;
+        struct printk_map *printk;
+        char *format;
+        char *p;
+
+        field = pevent->bprint_fmt_field;
+
+        if (!field) {
+                field = pevent_find_field(event, "fmt");
+                if (!field)
+                        die("can't find format field for binary printk");
+                pevent->bprint_fmt_field = field;
+        }
+
+        addr = pevent_read_number(pevent, data + field->offset, field->size);
+
+        printk = find_printk(pevent, addr);
+        if (!printk) {
+                format = malloc_or_die(45);
+                sprintf(format, "%%pf : (NO FORMAT FOUND at %llx)\n",
+                        addr);
+                return format;
+        }
+
+        p = printk->printk;
+        /* Remove any quotes. */
+        if (*p == '"')
+                p++;
+        format = malloc_or_die(strlen(p) + 10);
+        sprintf(format, "%s : %s", "%pf", p);
+        /* remove ending quotes and new line since we will add one too */
+        p = format + strlen(format) - 1;
+        if (*p == '"')
+                *p = 0;
+
+        p -= 2;
+        if (strcmp(p, "\\n") == 0)
+                *p = 0;
+
+        return format;
+}
+
+static void print_mac_arg(struct trace_seq *s, int mac, void *data, int size,
+                          struct event_format *event, struct print_arg *arg)
+{
+        unsigned char *buf;
+        char *fmt = "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x";
+
+        if (arg->type == PRINT_FUNC) {
+                process_defined_func(s, data, size, event, arg);
+                return;
+        }
+
+        if (arg->type != PRINT_FIELD) {
+                trace_seq_printf(s, "ARG TYPE NOT FIELD BUT %d",
+                                 arg->type);
+                return;
+        }
+
+        if (mac == 'm')
+                fmt = "%.2x%.2x%.2x%.2x%.2x%.2x";
+        if (!arg->field.field) {
+                arg->field.field =
+                        pevent_find_any_field(event, arg->field.name);
+                if (!arg->field.field)
+                        die("field %s not found", arg->field.name);
+        }
+        if (arg->field.field->size != 6) {
+                trace_seq_printf(s, "INVALIDMAC");
+                return;
+        }
+        buf = data + arg->field.field->offset;
+        trace_seq_printf(s, fmt, buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+}
+
+static void print_event_fields(struct trace_seq *s, void *data, int size,
+                               struct event_format *event)
+{
+        struct format_field *field;
+        unsigned long long val;
+        unsigned int offset, len, i;
+
+        field = event->format.fields;
+        while (field) {
+                trace_seq_printf(s, " %s=", field->name);
+                if (field->flags & FIELD_IS_ARRAY) {
+                        offset = field->offset;
+                        len = field->size;
+                        if (field->flags & FIELD_IS_DYNAMIC) {
+                                val = pevent_read_number(event->pevent, data + offset, len);
+                                offset = val;
+                                len = offset >> 16;
+                                offset &= 0xffff;
+                        }
+                        if (field->flags & FIELD_IS_STRING) {
+                                trace_seq_printf(s, "%s", (char *)data + offset);
+                        } else {
+                                trace_seq_puts(s, "ARRAY[");
+                                for (i = 0; i < len; i++) {
+                                        if (i)
+                                                trace_seq_puts(s, ", ");
+                                        trace_seq_printf(s, "%02x",
+                                                         *((unsigned char *)data + offset + i));
+                                }
+                                trace_seq_putc(s, ']');
+                        }
+                } else {
+                        val = pevent_read_number(event->pevent, data + field->offset,
+                                                 field->size);
+                        if (field->flags & FIELD_IS_POINTER) {
+                                trace_seq_printf(s, "0x%llx", val);
+                        } else if (field->flags & FIELD_IS_SIGNED) {
+                                switch (field->size) {
+                                case 4:
+                                        /*
+                                         * If field is long then print it in hex.
+                                         * A long usually stores pointers.
+                                         */
+                                        if (field->flags & FIELD_IS_LONG)
+                                                trace_seq_printf(s, "0x%x", (int)val);
+                                        else
+                                                trace_seq_printf(s, "%d", (int)val);
+                                        break;
+                                case 2:
+                                        trace_seq_printf(s, "%2d", (short)val);
+                                        break;
+                                case 1:
+                                        trace_seq_printf(s, "%1d", (char)val);
+                                        break;
+                                default:
+                                        trace_seq_printf(s, "%lld", val);
+                                }
+                        } else {
+                                if (field->flags & FIELD_IS_LONG)
+                                        trace_seq_printf(s, "0x%llx", val);
+                                else
+                                        trace_seq_printf(s, "%llu", val);
+                        }
+                }
+                field = field->next;
+        }
+}
+
+static void pretty_print(struct trace_seq *s, void *data, int size, struct event_format *event)
+{
+        struct pevent *pevent = event->pevent;
+        struct print_fmt *print_fmt = &event->print_fmt;
+        struct print_arg *arg = print_fmt->args;
+        struct print_arg *args = NULL;
+        const char *ptr = print_fmt->format;
+        unsigned long long val;
+        struct func_map *func;
+        const char *saveptr;
+        char *bprint_fmt = NULL;
+        char format[32];
+        int show_func;
+        int len_as_arg;
+        int len_arg;
+        int len;
+        int ls;
+
+        if (event->flags & EVENT_FL_FAILED) {
+                trace_seq_printf(s, "[FAILED TO PARSE]");
+                print_event_fields(s, data, size, event);
+                return;
+        }
+
+        if (event->flags & EVENT_FL_ISBPRINT) {
+                bprint_fmt = get_bprint_format(data, size, event);
+                args = make_bprint_args(bprint_fmt, data, size, event);
+                arg = args;
+                ptr = bprint_fmt;
+        }
+
+        for (; *ptr; ptr++) {
+                ls = 0;
+                if (*ptr == '\\') {
+                        ptr++;
+                        switch (*ptr) {
+                        case 'n':
+                                trace_seq_putc(s, '\n');
+                                break;
+                        case 't':
+                                trace_seq_putc(s, '\t');
+                                break;
+                        case 'r':
+                                trace_seq_putc(s, '\r');
+                                break;
+                        case '\\':
+                                trace_seq_putc(s, '\\');
+                                break;
+                        default:
+                                trace_seq_putc(s, *ptr);
+                                break;
+                        }
+
+                } else if (*ptr == '%') {
+                        saveptr = ptr;
+                        show_func = 0;
+                        len_as_arg = 0;
+ cont_process:
+                        ptr++;
+                        switch (*ptr) {
+                        case '%':
+                                trace_seq_putc(s, '%');
+                                break;
+                        case '#':
+                                /* FIXME: need to handle properly */
+                                goto cont_process;
+                        case 'h':
+                                ls--;
+                                goto cont_process;
+                        case 'l':
+                                ls++;
+                                goto cont_process;
+                        case 'L':
+                                ls = 2;
+                                goto cont_process;
+                        case '*':
+                                /* The argument is the length. */
+                                if (!arg)
+                                        die("no argument match");
+                                len_arg = eval_num_arg(data, size, event, arg);
+                                len_as_arg = 1;
+                                arg = arg->next;
+                                goto cont_process;
+                        case '.':
+                        case 'z':
+                        case 'Z':
+                        case '0' ... '9':
+                                goto cont_process;
+                        case 'p':
+                                if (pevent->long_size == 4)
+                                        ls = 1;
+                                else
+                                        ls = 2;
+
+                                if (*(ptr+1) == 'F' ||
+                                    *(ptr+1) == 'f') {
+                                        ptr++;
+                                        show_func = *ptr;
+                                } else if (*(ptr+1) == 'M' || *(ptr+1) == 'm') {
+                                        print_mac_arg(s, *(ptr+1), data, size, event, arg);
+                                        ptr++;
+                                        break;
+                                }
+
+                                /* fall through */
+                        case 'd':
+                        case 'i':
+                        case 'x':
+                        case 'X':
+                        case 'u':
+                                if (!arg)
+                                        die("no argument match");
+
+                                len = ((unsigned long)ptr + 1) -
+                                        (unsigned long)saveptr;
+
+                                /* should never happen */
+                                if (len > 31)
+                                        die("bad format!");
+
+                                memcpy(format, saveptr, len);
+                                format[len] = 0;
+
+                                val = eval_num_arg(data, size, event, arg);
+                                arg = arg->next;
+
+                                if (show_func) {
+                                        func = find_func(pevent, val);
+                                        if (func) {
+                                                trace_seq_puts(s, func->func);
+                                                if (show_func == 'F')
+                                                        trace_seq_printf(s,
+                                                               "+0x%llx",
+                                                               val - func->addr);
+                                                break;
+                                        }
+                                }
+                                if (pevent->long_size == 8 && ls) {
+                                        char *p;
+
+                                        ls = 2;
+                                        /* make %l into %ll */
+                                        p = strchr(format, 'l');
+                                        if (p)
+                                                memmove(p, p+1, strlen(p)+1);
+                                        else if (strcmp(format, "%p") == 0)
+                                                strcpy(format, "0x%llx");
+                                }
+                                switch (ls) {
+                                case -2:
+                                        if (len_as_arg)
+                                                trace_seq_printf(s, format, len_arg, (char)val);
+                                        else
+                                                trace_seq_printf(s, format, (char)val);
+                                        break;
+                                case -1:
+                                        if (len_as_arg)
+                                                trace_seq_printf(s, format, len_arg, (short)val);
+                                        else
+                                                trace_seq_printf(s, format, (short)val);
+                                        break;
+                                case 0:
+                                        if (len_as_arg)
+                                                trace_seq_printf(s, format, len_arg, (int)val);
+                                        else
+                                                trace_seq_printf(s, format, (int)val);
+                                        break;
+                                case 1:
+                                        if (len_as_arg)
+                                                trace_seq_printf(s, format, len_arg, (long)val);
+                                        else
+                                                trace_seq_printf(s, format, (long)val);
+                                        break;
+                                case 2:
+                                        if (len_as_arg)
+                                                trace_seq_printf(s, format, len_arg,
+                                                                 (long long)val);
+                                        else
+                                                trace_seq_printf(s, format, (long long)val);
+                                        break;
+                                default:
+                                        die("bad count (%d)", ls);
+                                }
+                                break;
+                        case 's':
+                                if (!arg)
+                                        die("no matching argument");
+
+                                len = ((unsigned long)ptr + 1) -
+                                        (unsigned long)saveptr;
+
+                                /* should never happen */
+                                if (len > 31)
+                                        die("bad format!");
+
+                                memcpy(format, saveptr, len);
+                                format[len] = 0;
+                                if (!len_as_arg)
+                                        len_arg = -1;
+                                print_str_arg(s, data, size, event,
+                                              format, len_arg, arg);
+                                arg = arg->next;
+                                break;
+                        default:
+                                trace_seq_printf(s, ">%c<", *ptr);
+
+                        }
+                } else
+                        trace_seq_putc(s, *ptr);
+        }
+
+        if (args) {
+                free_args(args);
+                free(bprint_fmt);
+        }
+}
+
+/**
+ * pevent_data_lat_fmt - parse the data for the latency format
+ * @pevent: a handle to the pevent
+ * @s: the trace_seq to write to
+ * @data: the raw data to read from
+ * @size: currently unused.
+ *
+ * This parses out the Latency format (interrupts disabled,
+ * need rescheduling, in hard/soft interrupt, preempt count
+ * and lock depth) and places it into the trace_seq.
+ */
+void pevent_data_lat_fmt(struct pevent *pevent,
+                         struct trace_seq *s, struct record *record)
+{
+        static int check_lock_depth = 1;
+        static int lock_depth_exists;
+        unsigned int lat_flags;
+        unsigned int pc;
+        int lock_depth;
+        int hardirq;
+        int softirq;
+        void *data = record->data;
+
+        lat_flags = parse_common_flags(pevent, data);
+        pc = parse_common_pc(pevent, data);
+        /* lock_depth may not always exist */
+        if (check_lock_depth) {
+                struct format_field *field;
+                struct event_format *event;
+
+                check_lock_depth = 0;
+                event = pevent->events[0];
+                field = pevent_find_common_field(event, "common_lock_depth");
+                if (field)
+                        lock_depth_exists = 1;
+        }
+        if (lock_depth_exists)
+                lock_depth = parse_common_lock_depth(pevent, data);
+
+        hardirq = lat_flags & TRACE_FLAG_HARDIRQ;
+        softirq = lat_flags & TRACE_FLAG_SOFTIRQ;
+
+        trace_seq_printf(s, "%c%c%c",
+               (lat_flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
+               (lat_flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
+               'X' : '.',
+               (lat_flags & TRACE_FLAG_NEED_RESCHED) ?
+               'N' : '.',
+               (hardirq && softirq) ? 'H' :
+               hardirq ? 'h' : softirq ? 's' : '.');
+
+        if (pc)
+                trace_seq_printf(s, "%x", pc);
+        else
+                trace_seq_putc(s, '.');
+
+        if (lock_depth_exists) {
+                if (lock_depth < 0)
+                        trace_seq_putc(s, '.');
+                else
+                        trace_seq_printf(s, "%d", lock_depth);
+        }
+
+        trace_seq_terminate(s);
+}
+
+/**
+ * pevent_data_type - parse out the given event type
+ * @pevent: a handle to the pevent
+ * @rec: the record to read from
+ *
+ * This returns the event id from the @rec.
+ */
+int pevent_data_type(struct pevent *pevent, struct record *rec)
+{
+        return trace_parse_common_type(pevent, rec->data);
+}
+
+/**
+ * pevent_data_event_from_type - find the event by a given type
+ * @pevent: a handle to the pevent
+ * @type: the type of the event.
+ *
+ * This returns the event form a given @type;
+ */
+struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type)
+{
+        return pevent_find_event(pevent, type);
+}
+
+/**
+ * pevent_data_pid - parse the PID from raw data
+ * @pevent: a handle to the pevent
+ * @rec: the record to parse
+ *
+ * This returns the PID from a raw data.
+ */
+int pevent_data_pid(struct pevent *pevent, struct record *rec)
+{
+        return parse_common_pid(pevent, rec->data);
+}
+
+/**
+ * pevent_data_comm_from_pid - return the command line from PID
+ * @pevent: a handle to the pevent
+ * @pid: the PID of the task to search for
+ *
+ * This returns a pointer to the command line that has the given
+ * @pid.
+ */
+const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid)
+{
+        const char *comm;
+
+        comm = find_cmdline(pevent, pid);
+        return comm;
+}
+
+/**
+ * pevent_data_comm_from_pid - parse the data into the print format
+ * @s: the trace_seq to write to
+ * @event: the handle to the event
+ * @cpu: the cpu the event was recorded on
+ * @data: the raw data
+ * @size: the size of the raw data
+ * @nsecs: the timestamp of the event
+ *
+ * This parses the raw @data using the given @event information and
+ * writes the print format into the trace_seq.
+ */
+void pevent_event_info(struct trace_seq *s, struct event_format *event,
+                       struct record *record)
+{
+        int print_pretty = 1;
+
+        if (event->pevent->print_raw)
+                print_event_fields(s, record->data, record->size, event);
+        else {
+
+                if (event->handler)
+                        print_pretty = event->handler(s, record, event,
+                                                      event->context);
+
+                if (print_pretty)
+                        pretty_print(s, record->data, record->size, event);
+        }
+
+        trace_seq_terminate(s);
+}
+
+void pevent_print_event(struct pevent *pevent, struct trace_seq *s,
+                        struct record *record)
+{
+        static char *spaces = "                    "; /* 20 spaces */
+        struct event_format *event;
+        unsigned long secs;
+        unsigned long usecs;
+        const char *comm;
+        void *data = record->data;
+        int type;
+        int pid;
+        int len;
+
+        secs = record->ts / NSECS_PER_SEC;
+        usecs = record->ts - secs * NSECS_PER_SEC;
+        usecs = (usecs + 500) / NSECS_PER_USEC;
+
+        if (record->size < 0) {
+                do_warning("ug! negative record size %d", record->size);
+                return;
+        }
+
+        type = trace_parse_common_type(pevent, data);
+
+        event = pevent_find_event(pevent, type);
+        if (!event) {
+                do_warning("ug! no event found for type %d", type);
+                return;
+        }
+
+        pid = parse_common_pid(pevent, data);
+        comm = find_cmdline(pevent, pid);
+
+        if (pevent->latency_format) {
+                trace_seq_printf(s, "%8.8s-%-5d %3d",
+                       comm, pid, record->cpu);
+                pevent_data_lat_fmt(pevent, s, record);
+        } else
+                trace_seq_printf(s, "%16s-%-5d [%03d]", comm, pid, record->cpu);
+
+        trace_seq_printf(s, " %5lu.%06lu: %s: ", secs, usecs, event->name);
+
+        /* Space out the event names evenly. */
+        len = strlen(event->name);
+        if (len < 20)
+                trace_seq_printf(s, "%.*s", 20 - len, spaces);
+
+        pevent_event_info(s, event, record);
+}
+
+static int events_id_cmp(const void *a, const void *b)
+{
+        struct event_format * const * ea = a;
+        struct event_format * const * eb = b;
+
+        if ((*ea)->id < (*eb)->id)
+                return -1;
+
+        if ((*ea)->id > (*eb)->id)
+                return 1;
+
+        return 0;
+}
+
+static int events_name_cmp(const void *a, const void *b)
+{
+        struct event_format * const * ea = a;
+        struct event_format * const * eb = b;
+        int res;
+
+        res = strcmp((*ea)->name, (*eb)->name);
+        if (res)
+                return res;
+
+        res = strcmp((*ea)->system, (*eb)->system);
+        if (res)
+                return res;
+
+        return events_id_cmp(a, b);
+}
+
+static int events_system_cmp(const void *a, const void *b)
+{
+        struct event_format * const * ea = a;
+        struct event_format * const * eb = b;
+        int res;
+
+        res = strcmp((*ea)->system, (*eb)->system);
+        if (res)
+                return res;
+
+        res = strcmp((*ea)->name, (*eb)->name);
+        if (res)
+                return res;
+
+        return events_id_cmp(a, b);
+}
+
+struct event_format **pevent_list_events(struct pevent *pevent, enum event_sort_type sort_type)
+{
+        struct event_format **events;
+        int (*sort)(const void *a, const void *b);
+
+        events = pevent->sort_events;
+
+        if (events && pevent->last_type == sort_type)
+                return events;
+
+        if (!events) {
+                events = malloc(sizeof(*events) * (pevent->nr_events + 1));
+                if (!events)
+                        return NULL;
+
+                memcpy(events, pevent->events, sizeof(*events) * pevent->nr_events);
+                events[pevent->nr_events] = NULL;
+
+                pevent->sort_events = events;
+
+                /* the internal events are sorted by id */
+                if (sort_type == EVENT_SORT_ID) {
+                        pevent->last_type = sort_type;
+                        return events;
+                }
+        }
+
+        switch (sort_type) {
+        case EVENT_SORT_ID:
+                sort = events_id_cmp;
+                break;
+        case EVENT_SORT_NAME:
+                sort = events_name_cmp;
+                break;
+        case EVENT_SORT_SYSTEM:
+                sort = events_system_cmp;
+                break;
+        default:
+                return events;
+        }
+
+        qsort(events, pevent->nr_events, sizeof(*events), sort);
+        pevent->last_type = sort_type;
+
+        return events;
+}
+
+static struct format_field **
+get_event_fields(const char *type, const char *name,
+                 int count, struct format_field *list)
+{
+        struct format_field **fields;
+        struct format_field *field;
+        int i = 0;
+
+        fields = malloc_or_die(sizeof(*fields) * (count + 1));
+        for (field = list; field; field = field->next) {
+                fields[i++] = field;
+                if (i == count + 1) {
+                        do_warning("event %s has more %s fields than specified",
+                                name, type);
+                        i--;
+                        break;
+                }
+        }
+
+        if (i != count)
+                do_warning("event %s has less %s fields than specified",
+                        name, type);
+
+        fields[i] = NULL;
+
+        return fields;
+}
+
+/**
+ * pevent_event_common_fields - return a list of common fields for an event
+ * @event: the event to return the common fields of.
+ *
+ * Returns an allocated array of fields. The last item in the array is NULL.
+ * The array must be freed with free().
+ */
+struct format_field **pevent_event_common_fields(struct event_format *event)
+{
+        return get_event_fields("common", event->name,
+                                event->format.nr_common,
+                                event->format.common_fields);
+}
+
+/**
+ * pevent_event_fields - return a list of event specific fields for an event
+ * @event: the event to return the fields of.
+ *
+ * Returns an allocated array of fields. The last item in the array is NULL.
+ * The array must be freed with free().
+ */
+struct format_field **pevent_event_fields(struct event_format *event)
+{
+        return get_event_fields("event", event->name,
+                                event->format.nr_fields,
+                                event->format.fields);
+}
+
+static void print_fields(struct trace_seq *s, struct print_flag_sym *field)
+{
+        trace_seq_printf(s, "{ %s, %s }", field->value, field->str);
+        if (field->next) {
+                trace_seq_puts(s, ", ");
+                print_fields(s, field->next);
+        }
+}
+
+/* for debugging */
+static void print_args(struct print_arg *args)
+{
+        int print_paren = 1;
+        struct trace_seq s;
+
+        switch (args->type) {
+        case PRINT_NULL:
+                printf("null");
+                break;
+        case PRINT_ATOM:
+                printf("%s", args->atom.atom);
+                break;
+        case PRINT_FIELD:
+                printf("REC->%s", args->field.name);
+                break;
+        case PRINT_FLAGS:
+                printf("__print_flags(");
+                print_args(args->flags.field);
+                printf(", %s, ", args->flags.delim);
+                trace_seq_init(&s);
+                print_fields(&s, args->flags.flags);
+                trace_seq_do_printf(&s);
+                trace_seq_destroy(&s);
+                printf(")");
+                break;
+        case PRINT_SYMBOL:
+                printf("__print_symbolic(");
+                print_args(args->symbol.field);
+                printf(", ");
+                trace_seq_init(&s);
+                print_fields(&s, args->symbol.symbols);
+                trace_seq_do_printf(&s);
+                trace_seq_destroy(&s);
+                printf(")");
+                break;
+        case PRINT_STRING:
+        case PRINT_BSTRING:
+                printf("__get_str(%s)", args->string.string);
+                break;
+        case PRINT_TYPE:
+                printf("(%s)", args->typecast.type);
+                print_args(args->typecast.item);
+                break;
+        case PRINT_OP:
+                if (strcmp(args->op.op, ":") == 0)
+                        print_paren = 0;
+                if (print_paren)
+                        printf("(");
+                print_args(args->op.left);
+                printf(" %s ", args->op.op);
+                print_args(args->op.right);
+                if (print_paren)
+                        printf(")");
+                break;
+        default:
+                /* we should warn... */
+                return;
+        }
+        if (args->next) {
+                printf("\n");
+                print_args(args->next);
+        }
+}
+
+static void parse_header_field(const char *field,
+                               int *offset, int *size, int mandatory)
+{
+        unsigned long long save_input_buf_ptr;
+        unsigned long long save_input_buf_siz;
+        char *token;
+        int type;
+
+        save_input_buf_ptr = input_buf_ptr;
+        save_input_buf_siz = input_buf_siz;
+
+        if (read_expected(EVENT_ITEM, "field") < 0)
+                return;
+        if (read_expected(EVENT_OP, ":") < 0)
+                return;
+
+        /* type */
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto fail;
+        free_token(token);
+
+        /*
+         * If this is not a mandatory field, then test it first.
+         */
+        if (mandatory) {
+                if (read_expected(EVENT_ITEM, field) < 0)
+                        return;
+        } else {
+                if (read_expect_type(EVENT_ITEM, &token) < 0)
+                        goto fail;
+                if (strcmp(token, field) != 0)
+                        goto discard;
+                free_token(token);
+        }
+
+        if (read_expected(EVENT_OP, ";") < 0)
+                return;
+        if (read_expected(EVENT_ITEM, "offset") < 0)
+                return;
+        if (read_expected(EVENT_OP, ":") < 0)
+                return;
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto fail;
+        *offset = atoi(token);
+        free_token(token);
+        if (read_expected(EVENT_OP, ";") < 0)
+                return;
+        if (read_expected(EVENT_ITEM, "size") < 0)
+                return;
+        if (read_expected(EVENT_OP, ":") < 0)
+                return;
+        if (read_expect_type(EVENT_ITEM, &token) < 0)
+                goto fail;
+        *size = atoi(token);
+        free_token(token);
+        if (read_expected(EVENT_OP, ";") < 0)
+                return;
+        type = read_token(&token);
+        if (type != EVENT_NEWLINE) {
+                /* newer versions of the kernel have a "signed" type */
+                if (type != EVENT_ITEM)
+                        goto fail;
+
+                if (strcmp(token, "signed") != 0)
+                        goto fail;
+
+                free_token(token);
+
+                if (read_expected(EVENT_OP, ":") < 0)
+                        return;
+
+                if (read_expect_type(EVENT_ITEM, &token))
+                        goto fail;
+
+                free_token(token);
+                if (read_expected(EVENT_OP, ";") < 0)
+                        return;
+
+                if (read_expect_type(EVENT_NEWLINE, &token))
+                        goto fail;
+        }
+ fail:
+        free_token(token);
+        return;
+
+ discard:
+        input_buf_ptr = save_input_buf_ptr;
+        input_buf_siz = save_input_buf_siz;
+        *offset = 0;
+        *size = 0;
+        free_token(token);
+}
+
+/**
+ * pevent_parse_header_page - parse the data stored in the header page
+ * @pevent: the handle to the pevent
+ * @buf: the buffer storing the header page format string
+ * @size: the size of @buf
+ * @long_size: the long size to use if there is no header
+ *
+ * This parses the header page format for information on the
+ * ring buffer used. The @buf should be copied from
+ *
+ * /sys/kernel/debug/tracing/events/header_page
+ */
+int pevent_parse_header_page(struct pevent *pevent, char *buf, unsigned long size,
+                             int long_size)
+{
+        int ignore;
+
+        if (!size) {
+                /*
+                 * Old kernels did not have header page info.
+                 * Sorry but we just use what we find here in user space.
+                 */
+                pevent->header_page_ts_size = sizeof(long long);
+                pevent->header_page_size_size = long_size;
+                pevent->header_page_data_offset = sizeof(long long) + long_size;
+                pevent->old_format = 1;
+                return -1;
+        }
+        init_input_buf(buf, size);
+
+        parse_header_field("timestamp", &pevent->header_page_ts_offset,
+                           &pevent->header_page_ts_size, 1);
+        parse_header_field("commit", &pevent->header_page_size_offset,
+                           &pevent->header_page_size_size, 1);
+        parse_header_field("overwrite", &pevent->header_page_overwrite,
+                           &ignore, 0);
+        parse_header_field("data", &pevent->header_page_data_offset,
+                           &pevent->header_page_data_size, 1);
+
+        return 0;
+}
+
+static int event_matches(struct event_format *event,
+                         int id, const char *sys_name,
+                         const char *event_name)
+{
+        if (id >= 0 && id != event->id)
+                return 0;
+
+        if (event_name && (strcmp(event_name, event->name) != 0))
+                return 0;
+
+        if (sys_name && (strcmp(sys_name, event->system) != 0))
+                return 0;
+
+        return 1;
+}
+
+static void free_handler(struct event_handler *handle)
+{
+        free((void *)handle->sys_name);
+        free((void *)handle->event_name);
+        free(handle);
+}
+
+static int find_event_handle(struct pevent *pevent, struct event_format *event)
+{
+        struct event_handler *handle, **next;
+
+        for (next = &pevent->handlers; *next;
+             next = &(*next)->next) {
+                handle = *next;
+                if (event_matches(event, handle->id,
+                                  handle->sys_name,
+                                  handle->event_name))
+                        break;
+        }
+
+        if (!(*next))
+                return 0;
+
+        pr_stat("overriding event (%d) %s:%s with new print handler",
+                event->id, event->system, event->name);
+
+        event->handler = handle->func;
+        event->context = handle->context;
+
+        *next = handle->next;
+        free_handler(handle);
+
+        return 1;
+}
+
+/**
+ * pevent_parse_event - parse the event format
+ * @pevent: the handle to the pevent
+ * @buf: the buffer storing the event format string
+ * @size: the size of @buf
+ * @sys: the system the event belongs to
+ *
+ * This parses the event format and creates an event structure
+ * to quickly parse raw data for a given event.
+ *
+ * These files currently come from:
+ *
+ * /sys/kernel/debug/tracing/events/.../.../format
+ */
+int pevent_parse_event(struct pevent *pevent,
+                       const char *buf, unsigned long size,
+                       const char *sys)
+{
+        struct event_format *event;
+        int ret;
+
+        init_input_buf(buf, size);
+
+        event = alloc_event();
+        if (!event)
+                return -ENOMEM;
+
+        event->name = event_read_name();
+        if (!event->name) {
+                /* Bad event? */
+                free(event);
+                return -1;
+        }
+
+        if (strcmp(sys, "ftrace") == 0) {
+
+                event->flags |= EVENT_FL_ISFTRACE;
+
+                if (strcmp(event->name, "bprint") == 0)
+                        event->flags |= EVENT_FL_ISBPRINT;
+        }
+                
+        event->id = event_read_id();
+        if (event->id < 0)
+                die("failed to read event id");
+
+        event->system = strdup(sys);
+
+        /* Add pevent to event so that it can be referenced */
+        event->pevent = pevent;
+
+        ret = event_read_format(event);
+        if (ret < 0) {
+                do_warning("failed to read event format for %s", event->name);
+                goto event_failed;
+        }
+
+        /*
+         * If the event has an override, don't print warnings if the event
+         * print format fails to parse.
+         */
+        if (find_event_handle(pevent, event))
+                show_warning = 0;
+
+        ret = event_read_print(event);
+        if (ret < 0) {
+                do_warning("failed to read event print fmt for %s",
+                           event->name);
+                show_warning = 1;
+                goto event_failed;
+        }
+        show_warning = 1;
+
+        add_event(pevent, event);
+
+        if (!ret && (event->flags & EVENT_FL_ISFTRACE)) {
+                struct format_field *field;
+                struct print_arg *arg, **list;
+
+                /* old ftrace had no args */
+
+                list = &event->print_fmt.args;
+                for (field = event->format.fields; field; field = field->next) {
+                        arg = alloc_arg();
+                        *list = arg;
+                        list = &arg->next;
+                        arg->type = PRINT_FIELD;
+                        arg->field.name = strdup(field->name);
+                        arg->field.field = field;
+                }
+                return 0;
+        }
+
+#define PRINT_ARGS 0
+        if (PRINT_ARGS && event->print_fmt.args)
+                print_args(event->print_fmt.args);
+
+        return 0;
+
+ event_failed:
+        event->flags |= EVENT_FL_FAILED;
+        /* still add it even if it failed */
+        add_event(pevent, event);
+        return -1;
+}
+
+int get_field_val(struct trace_seq *s, struct format_field *field,
+                  const char *name, struct record *record,
+                  unsigned long long *val, int err)
+{
+        if (!field) {
+                if (err)
+                        trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
+                return -1;
+        }
+
+        if (pevent_read_number_field(field, record->data, val)) {
+                if (err)
+                        trace_seq_printf(s, " %s=INVALID", name);
+                return -1;
+        }
+
+        return 0;
+}
+
+/**
+ * pevent_get_field_raw - return the raw pointer into the data field
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @len: place to store the field length.
+ * @err: print default error if failed.
+ *
+ * Returns a pointer into record->data of the field and places
+ * the length of the field in @len.
+ *
+ * On failure, it returns NULL.
+ */
+void *pevent_get_field_raw(struct trace_seq *s, struct event_format *event,
+                           const char *name, struct record *record,
+                           int *len, int err)
+{
+        struct format_field *field;
+        void *data = record->data;
+        unsigned offset;
+        int dummy;
+
+        if (!event)
+                return NULL;
+
+        field = pevent_find_field(event, name);
+
+        if (!field) {
+                if (err)
+                        trace_seq_printf(s, "<CANT FIND FIELD %s>", name);
+                return NULL;
+        }
+
+        /* Allow @len to be NULL */
+        if (!len)
+                len = &dummy;
+
+        offset = field->offset;
+        if (field->flags & FIELD_IS_DYNAMIC) {
+                offset = pevent_read_number(event->pevent,
+                                            data + offset, field->size);
+                *len = offset >> 16;
+                offset &= 0xffff;
+        } else
+                *len = field->size;
+
+        return data + offset;
+}
+
+/**
+ * pevent_get_field_val - find a field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int pevent_get_field_val(struct trace_seq *s, struct event_format *event,
+                         const char *name, struct record *record,
+                         unsigned long long *val, int err)
+{
+        struct format_field *field;
+
+        if (!event)
+                return -1;
+
+        field = pevent_find_field(event, name);
+
+        return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * pevent_get_common_field_val - find a common field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int pevent_get_common_field_val(struct trace_seq *s, struct event_format *event,
+                                const char *name, struct record *record,
+                                unsigned long long *val, int err)
+{
+        struct format_field *field;
+
+        if (!event)
+                return -1;
+
+        field = pevent_find_common_field(event, name);
+
+        return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * pevent_get_any_field_val - find a any field and return its value
+ * @s: The seq to print to on error
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @val: place to store the value of the field.
+ * @err: print default error if failed.
+ *
+ * Returns 0 on success -1 on field not found.
+ */
+int pevent_get_any_field_val(struct trace_seq *s, struct event_format *event,
+                             const char *name, struct record *record,
+                             unsigned long long *val, int err)
+{
+        struct format_field *field;
+
+        if (!event)
+                return -1;
+
+        field = pevent_find_any_field(event, name);
+
+        return get_field_val(s, field, name, record, val, err);
+}
+
+/**
+ * pevent_print_num_field - print a field and a format
+ * @s: The seq to print to
+ * @fmt: The printf format to print the field with.
+ * @event: the event that the field is for
+ * @name: The name of the field
+ * @record: The record with the field name.
+ * @err: print default error if failed.
+ *
+ * Returns: 0 on success, -1 field not fould, or 1 if buffer is full.
+ */
+int pevent_print_num_field(struct trace_seq *s, const char *fmt,
+                           struct event_format *event, const char *name,
+                           struct record *record, int err)
+{
+        struct format_field *field = pevent_find_field(event, name);
+        unsigned long long val;
+
+        if (!field)
+                goto failed;
+
+        if (pevent_read_number_field(field, record->data, &val))
+                goto failed;
+
+        return trace_seq_printf(s, fmt, val);
+
+ failed:
+        if (err)
+                trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);
+        return -1;
+}
+
+static void free_func_handle(struct pevent_function_handler *func)
+{
+        struct pevent_func_params *params;
+
+        free(func->name);
+
+        while (func->params) {
+                params = func->params;
+                func->params = params->next;
+                free(params);
+        }
+
+        free(func);
+}
+
+/**
+ * pevent_register_print_function - register a helper function
+ * @pevent: the handle to the pevent
+ * @func: the function to process the helper function
+ * @name: the name of the helper function
+ * @parameters: A list of enum pevent_func_arg_type
+ *
+ * Some events may have helper functions in the print format arguments.
+ * This allows a plugin to dynmically create a way to process one
+ * of these functions.
+ *
+ * The @parameters is a variable list of pevent_func_arg_type enums that
+ * must end with PEVENT_FUNC_ARG_VOID.
+ */
+int pevent_register_print_function(struct pevent *pevent,
+                                   pevent_func_handler func,
+                                   enum pevent_func_arg_type ret_type,
+                                   char *name, ...)
+{
+        struct pevent_function_handler *func_handle;
+        struct pevent_func_params **next_param;
+        struct pevent_func_params *param;
+        enum pevent_func_arg_type type;
+        va_list ap;
+
+        func_handle = find_func_handler(pevent, name);
+        if (func_handle) {
+                /*
+                 * This is most like caused by the users own
+                 * plugins updating the function. This overrides the
+                 * system defaults.
+                 */
+                pr_stat("override of function helper '%s'", name);
+                remove_func_handler(pevent, name);
+        }
+
+        func_handle = malloc_or_die(sizeof(*func_handle));
+        memset(func_handle, 0, sizeof(*func_handle));
+
+        func_handle->ret_type = ret_type;
+        func_handle->name = strdup(name);
+        func_handle->func = func;
+        if (!func_handle->name)
+                die("Failed to allocate function name");
+
+        next_param = &(func_handle->params);
+        va_start(ap, name);
+        for (;;) {
+                type = va_arg(ap, enum pevent_func_arg_type);
+                if (type == PEVENT_FUNC_ARG_VOID)
+                        break;
+
+                if (type < 0 || type >= PEVENT_FUNC_ARG_MAX_TYPES) {
+                        warning("Invalid argument type %d", type);
+                        goto out_free;
+                }
+
+                param = malloc_or_die(sizeof(*param));
+                param->type = type;
+                param->next = NULL;
+
+                *next_param = param;
+                next_param = &(param->next);
+
+                func_handle->nr_args++;
+        }
+        va_end(ap);
+
+        func_handle->next = pevent->func_handlers;
+        pevent->func_handlers = func_handle;
+
+        return 0;
+ out_free:
+        va_end(ap);
+        free_func_handle(func_handle);
+        return -1;
+}
+
+/**
+ * pevent_register_event_handle - register a way to parse an event
+ * @pevent: the handle to the pevent
+ * @id: the id of the event to register
+ * @sys_name: the system name the event belongs to
+ * @event_name: the name of the event
+ * @func: the function to call to parse the event information
+ *
+ * This function allows a developer to override the parsing of
+ * a given event. If for some reason the default print format
+ * is not sufficient, this function will register a function
+ * for an event to be used to parse the data instead.
+ *
+ * If @id is >= 0, then it is used to find the event.
+ * else @sys_name and @event_name are used.
+ */
+int pevent_register_event_handler(struct pevent *pevent,
+                                  int id, char *sys_name, char *event_name,
+                                  pevent_event_handler_func func,
+                                  void *context)
+{
+        struct event_format *event;
+        struct event_handler *handle;
+
+        if (id >= 0) {
+                /* search by id */
+                event = pevent_find_event(pevent, id);
+                if (!event)
+                        goto not_found;
+                if (event_name && (strcmp(event_name, event->name) != 0))
+                        goto not_found;
+                if (sys_name && (strcmp(sys_name, event->system) != 0))
+                        goto not_found;
+        } else {
+                event = pevent_find_event_by_name(pevent, sys_name, event_name);
+                if (!event)
+                        goto not_found;
+        }
+
+        pr_stat("overriding event (%d) %s:%s with new print handler",
+                event->id, event->system, event->name);
+
+        event->handler = func;
+        event->context = context;
+        return 0;
+
+ not_found:
+        /* Save for later use. */
+        handle = malloc_or_die(sizeof(*handle));
+        memset(handle, 0, sizeof(handle));
+        handle->id = id;
+        if (event_name)
+                handle->event_name = strdup(event_name);
+        if (sys_name)
+                handle->sys_name = strdup(sys_name);
+
+        handle->func = func;
+        handle->next = pevent->handlers;
+        pevent->handlers = handle;
+        handle->context = context;
+
+        return -1;
+}
+
+/**
+ * pevent_alloc - create a pevent handle
+ */
+struct pevent *pevent_alloc(void)
+{
+        struct pevent *pevent;
+
+        pevent = malloc(sizeof(*pevent));
+        if (!pevent)
+                return NULL;
+        memset(pevent, 0, sizeof(*pevent));
+        pevent->ref_count = 1;
+
+        return pevent;
+}
+
+void pevent_ref(struct pevent *pevent)
+{
+        pevent->ref_count++;
+}
+
+static void free_format_fields(struct format_field *field)
+{
+        struct format_field *next;
+
+        while (field) {
+                next = field->next;
+                free(field->type);
+                free(field->name);
+                free(field);
+                field = next;
+        }
+}
+
+static void free_formats(struct format *format)
+{
+        free_format_fields(format->common_fields);
+        free_format_fields(format->fields);
+}
+
+static void free_event(struct event_format *event)
+{
+        free(event->name);
+        free(event->system);
+
+        free_formats(&event->format);
+
+        free(event->print_fmt.format);
+        free_args(event->print_fmt.args);
+
+        free(event);
+}
+
+/**
+ * pevent_free - free a pevent handle
+ * @pevent: the pevent handle to free
+ */
+void pevent_free(struct pevent *pevent)
+{
+        struct cmdline_list *cmdlist = pevent->cmdlist, *cmdnext;
+        struct func_list *funclist = pevent->funclist, *funcnext;
+        struct printk_list *printklist = pevent->printklist, *printknext;
+        struct pevent_function_handler *func_handler;
+        struct event_handler *handle;
+        int i;
+
+        pevent->ref_count--;
+        if (pevent->ref_count)
+                return;
+
+        if (pevent->cmdlines) {
+                for (i = 0; i < pevent->cmdline_count; i++)
+                        free(pevent->cmdlines[i].comm);
+                free(pevent->cmdlines);
+        }
+
+        while (cmdlist) {
+                cmdnext = cmdlist->next;
+                free(cmdlist->comm);
+                free(cmdlist);
+                cmdlist = cmdnext;
+        }
+
+        if (pevent->func_map) {
+                for (i = 0; i < pevent->func_count; i++) {
+                        free(pevent->func_map[i].func);
+                        free(pevent->func_map[i].mod);
+                }
+                free(pevent->func_map);
+        }
+
+        while (funclist) {
+                funcnext = funclist->next;
+                free(funclist->func);
+                free(funclist->mod);
+                free(funclist);
+                funclist = funcnext;
+        }
+
+        while (pevent->func_handlers) {
+                func_handler = pevent->func_handlers;
+                pevent->func_handlers = func_handler->next;
+                free_func_handle(func_handler);
+        }
+
+        if (pevent->printk_map) {
+                for (i = 0; i < pevent->printk_count; i++)
+                        free(pevent->printk_map[i].printk);
+                free(pevent->printk_map);
+        }
+
+        while (printklist) {
+                printknext = printklist->next;
+                free(printklist->printk);
+                free(printklist);
+                printklist = printknext;
+        }
+
+        for (i = 0; i < pevent->nr_events; i++)
+                free_event(pevent->events[i]);
+
+        while (pevent->handlers) {
+                handle = pevent->handlers;
+                pevent->handlers = handle->next;
+                free_handler(handle);
+        }
+
+        free(pevent->events);
+        free(pevent->sort_events);
+
+        free(pevent);
+}
+
+void pevent_unref(struct pevent *pevent)
+{
+        pevent_free(pevent);
+}