perf report: Only load text symbols from kallsyms, fix

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / Documentation / perf_counter / builtin-report.c

#include "util/util.h"

#include <libelf.h>
#include <gelf.h>
#include <elf.h>
#include <ctype.h>

#include "util/list.h"
#include "util/rbtree.h"

#include "perf.h"

#include "util/parse-options.h"
#include "util/parse-events.h"

#define SHOW_KERNEL     1
#define SHOW_USER       2
#define SHOW_HV         4

static char             const *input_name = "output.perf";
static int              input;
static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;

static int              dump_trace = 0;

static unsigned long    page_size;
static unsigned long    mmap_window = 32;

const char *perf_event_names[] = {
        [PERF_EVENT_MMAP]   = " PERF_EVENT_MMAP",
        [PERF_EVENT_MUNMAP] = " PERF_EVENT_MUNMAP",
        [PERF_EVENT_COMM]   = " PERF_EVENT_COMM",
};

struct ip_event {
        struct perf_event_header header;
        __u64 ip;
        __u32 pid, tid;
};
struct mmap_event {
        struct perf_event_header header;
        __u32 pid, tid;
        __u64 start;
        __u64 len;
        __u64 pgoff;
        char filename[PATH_MAX];
};
struct comm_event {
        struct perf_event_header header;
        __u32 pid,tid;
        char comm[16];
};

typedef union event_union {
        struct perf_event_header header;
        struct ip_event ip;
        struct mmap_event mmap;
        struct comm_event comm;
} event_t;

struct symbol {
        struct rb_node rb_node;
        uint64_t       start;
        uint64_t       end;
        char           name[0];
};

static struct symbol *symbol__new(uint64_t start, uint64_t len, const char *name)
{
        struct symbol *self = malloc(sizeof(*self) + strlen(name) + 1);

        if (self != NULL) {
                self->start = start;
                self->end   = start + len;
                strcpy(self->name, name);
        }

        return self;
}

static void symbol__delete(struct symbol *self)
{
        free(self);
}

static size_t symbol__fprintf(struct symbol *self, FILE *fp)
{
        return fprintf(fp, " %lx-%lx %s\n",
                       self->start, self->end, self->name);
}

struct dso {
        struct list_head node;
        struct rb_root   syms;
        char             name[0];
};

static struct dso *dso__new(const char *name)
{
        struct dso *self = malloc(sizeof(*self) + strlen(name) + 1);

        if (self != NULL) {
                strcpy(self->name, name);
                self->syms = RB_ROOT;
        }

        return self;
}

static void dso__delete_symbols(struct dso *self)
{
        struct symbol *pos;
        struct rb_node *next = rb_first(&self->syms);

        while (next) {
                pos = rb_entry(next, struct symbol, rb_node);
                next = rb_next(&pos->rb_node);
                symbol__delete(pos);
        }
}

static void dso__delete(struct dso *self)
{
        dso__delete_symbols(self);
        free(self);
}

static void dso__insert_symbol(struct dso *self, struct symbol *sym)
{
        struct rb_node **p = &self->syms.rb_node;
        struct rb_node *parent = NULL;
        const uint64_t ip = sym->start;
        struct symbol *s;

        while (*p != NULL) {
                parent = *p;
                s = rb_entry(parent, struct symbol, rb_node);
                if (ip < s->start)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }
        rb_link_node(&sym->rb_node, parent, p);
        rb_insert_color(&sym->rb_node, &self->syms);
}

static struct symbol *dso__find_symbol(struct dso *self, uint64_t ip)
{
        if (self == NULL)
                return NULL;

        struct rb_node *n = self->syms.rb_node;

        while (n) {
                struct symbol *s = rb_entry(n, struct symbol, rb_node);

                if (ip < s->start)
                        n = n->rb_left;
                else if (ip > s->end)
                        n = n->rb_right;
                else
                        return s;
        }

        return NULL;
}

/**
 * elf_symtab__for_each_symbol - iterate thru all the symbols
 *
 * @self: struct elf_symtab instance to iterate
 * @index: uint32_t index
 * @sym: GElf_Sym iterator
 */
#define elf_symtab__for_each_symbol(syms, nr_syms, index, sym) \
        for (index = 0, gelf_getsym(syms, index, &sym);\
             index < nr_syms; \
             index++, gelf_getsym(syms, index, &sym))

static inline uint8_t elf_sym__type(const GElf_Sym *sym)
{
        return GELF_ST_TYPE(sym->st_info);
}

static inline int elf_sym__is_function(const GElf_Sym *sym)
{
        return elf_sym__type(sym) == STT_FUNC &&
               sym->st_name != 0 &&
               sym->st_shndx != SHN_UNDEF;
}

static inline const char *elf_sym__name(const GElf_Sym *sym,
                                        const Elf_Data *symstrs)
{
        return symstrs->d_buf + sym->st_name;
}

static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
                                    GElf_Shdr *shp, const char *name,
                                    size_t *index)
{
        Elf_Scn *sec = NULL;
        size_t cnt = 1;

        while ((sec = elf_nextscn(elf, sec)) != NULL) {
                char *str;

                gelf_getshdr(sec, shp);
                str = elf_strptr(elf, ep->e_shstrndx, shp->sh_name);
                if (!strcmp(name, str)) {
                        if (index)
                                *index = cnt;
                        break;
                }
                ++cnt;
        }

        return sec;
}

static int dso__load(struct dso *self)
{
        int fd = open(self->name, O_RDONLY), err = -1;

        if (fd == -1)
                return -1;

        Elf *elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
        if (elf == NULL) {
                fprintf(stderr, "%s: cannot read %s ELF file.\n",
                        __func__, self->name);
                goto out_close;
        }

        GElf_Ehdr ehdr;
        if (gelf_getehdr(elf, &ehdr) == NULL) {
                fprintf(stderr, "%s: cannot get elf header.\n", __func__);
                goto out_elf_end;
        }

        GElf_Shdr shdr;
        Elf_Scn *sec = elf_section_by_name(elf, &ehdr, &shdr, ".symtab", NULL);
        if (sec == NULL)
                sec = elf_section_by_name(elf, &ehdr, &shdr, ".dynsym", NULL);

        if (sec == NULL)
                goto out_elf_end;

        Elf_Data *syms = elf_getdata(sec, NULL);
        if (syms == NULL)
                goto out_elf_end;

        sec = elf_getscn(elf, shdr.sh_link);
        if (sec == NULL)
                goto out_elf_end;

        Elf_Data *symstrs = elf_getdata(sec, NULL);
        if (symstrs == NULL)
                goto out_elf_end;

        const uint32_t nr_syms = shdr.sh_size / shdr.sh_entsize;

        GElf_Sym sym;
        uint32_t index;
        elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
                struct symbol *f;

                if (!elf_sym__is_function(&sym))
                        continue;

                sec = elf_getscn(elf, sym.st_shndx);
                if (!sec)
                        goto out_elf_end;

                gelf_getshdr(sec, &shdr);
                sym.st_value -= shdr.sh_addr - shdr.sh_offset;

                f = symbol__new(sym.st_value, sym.st_size,
                                elf_sym__name(&sym, symstrs));
                if (!f)
                        goto out_elf_end;

                dso__insert_symbol(self, f);
        }

        err = 0;
out_elf_end:
        elf_end(elf);
out_close:
        close(fd);
        return err;
}

static size_t dso__fprintf(struct dso *self, FILE *fp)
{
        size_t ret = fprintf(fp, "dso: %s\n", self->name);

        struct rb_node *nd;
        for (nd = rb_first(&self->syms); nd; nd = rb_next(nd)) {
                struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
                ret += symbol__fprintf(pos, fp);
        }

        return ret;
}

static LIST_HEAD(dsos);
static struct dso *kernel_dso;

static void dsos__add(struct dso *dso)
{
        list_add_tail(&dso->node, &dsos);
}

static struct dso *dsos__find(const char *name)
{
        struct dso *pos;

        list_for_each_entry(pos, &dsos, node)
                if (strcmp(pos->name, name) == 0)
                        return pos;
        return NULL;
}

static struct dso *dsos__findnew(const char *name)
{
        struct dso *dso = dsos__find(name);

        if (dso == NULL) {
                dso = dso__new(name);
                if (dso != NULL && dso__load(dso) < 0)
                        goto out_delete_dso;

                dsos__add(dso);
        }

        return dso;

out_delete_dso:
        dso__delete(dso);
        return NULL;
}

void dsos__fprintf(FILE *fp)
{
        struct dso *pos;

        list_for_each_entry(pos, &dsos, node)
                dso__fprintf(pos, fp);
}

static int hex(char ch)
{
        if ((ch >= '0') && (ch <= '9'))
                return ch - '0';
        if ((ch >= 'a') && (ch <= 'f'))
                return ch - 'a' + 10;
        if ((ch >= 'A') && (ch <= 'F'))
                return ch - 'A' + 10;
        return -1;
}

/*
 * While we find nice hex chars, build a long_val.
 * Return number of chars processed.
 */
int hex2long(char *ptr, unsigned long *long_val)
{
        const char *p = ptr;
        *long_val = 0;

        while (*p) {
                const int hex_val = hex(*p);

                if (hex_val < 0)
                        break;

                *long_val = (*long_val << 4) | hex_val;
                p++;
        }

        return p - ptr;
}

static int load_kallsyms(void)
{
        struct rb_node *nd, *prevnd;
        char *line = NULL;
        FILE *file;
        size_t n;

        kernel_dso = dso__new("[kernel]");
        if (kernel_dso == NULL)
                return -1;

        file = fopen("/proc/kallsyms", "r");
        if (file == NULL)
                goto out_delete_dso;

        while (!feof(file)) {
                unsigned long start;
                struct symbol *sym;
                int line_len, len;
                char symbol_type;

                line_len = getline(&line, &n, file);
                if (line_len < 0)
                        break;

                if (!line)
                        goto out_delete_dso;

                line[--line_len] = '\0'; /* \n */

                len = hex2long(line, &start);

                len++;
                if (len + 2 >= line_len)
                        continue;

                symbol_type = toupper(line[len]);
                /*
                 * We're interested only in code ('T'ext)
                 */
                if (symbol_type != 'T' && symbol_type != 'W')
                        continue;
                /*
                 * Well fix up the end later, when we have all sorted.
                 */
                sym = symbol__new(start, 0xdead, line + len + 2);

                if (sym == NULL)
                        goto out_delete_dso;

                dso__insert_symbol(kernel_dso, sym);
        }

        /*
         * Now that we have all sorted out, just set the ->end of all
         * symbols
         */
        prevnd = rb_first(&kernel_dso->syms);

        if (prevnd == NULL)
                goto out_delete_line;

        for (nd = rb_next(prevnd); nd; nd = rb_next(nd)) {
                struct symbol *prev = rb_entry(prevnd, struct symbol, rb_node),
                              *curr = rb_entry(nd, struct symbol, rb_node);

                prev->end = curr->start - 1;
                prevnd = nd;
        }

        dsos__add(kernel_dso);
        free(line);
        fclose(file);

        return 0;

out_delete_line:
        free(line);
out_delete_dso:
        dso__delete(kernel_dso);
        return -1;
}

struct map {
        struct list_head node;
        uint64_t         start;
        uint64_t         end;
        uint64_t         pgoff;
        struct dso       *dso;
};

static struct map *map__new(struct mmap_event *event)
{
        struct map *self = malloc(sizeof(*self));

        if (self != NULL) {
                self->start = event->start;
                self->end   = event->start + event->len;
                self->pgoff = event->pgoff;

                self->dso = dsos__findnew(event->filename);
                if (self->dso == NULL)
                        goto out_delete;
        }
        return self;
out_delete:
        free(self);
        return NULL;
}

static size_t map__fprintf(struct map *self, FILE *fp)
{
        return fprintf(fp, " %lx-%lx %lx %s\n",
                       self->start, self->end, self->pgoff, self->dso->name);
}

struct thread;

static const char *thread__name(struct thread *self, char *bf, size_t size);

struct symhist {
        struct rb_node   rb_node;
        struct dso       *dso;
        struct symbol    *sym;
        struct thread    *thread;
        uint64_t         ip;
        uint32_t         count;
        char             level;
};

static struct symhist *symhist__new(struct symbol *sym, uint64_t ip,
                                    struct thread *thread, struct dso *dso,
                                    char level)
{
        struct symhist *self = malloc(sizeof(*self));

        if (self != NULL) {
                self->sym    = sym;
                self->thread = thread;
                self->ip     = ip;
                self->dso    = dso;
                self->level  = level;
                self->count  = 1;
        }

        return self;
}

void symhist__delete(struct symhist *self)
{
        free(self);
}

static void symhist__inc(struct symhist *self)
{
        ++self->count;
}

static size_t
symhist__fprintf(struct symhist *self, uint64_t total_samples, FILE *fp)
{
        char bf[32];
        size_t ret;

        if (total_samples)
                ret = fprintf(fp, "%5.2f", (self->count * 100.0) / total_samples);
        else
                ret = fprintf(fp, "%12d", self->count);

        ret += fprintf(fp, "%14s [%c] %#018llx ",
                       thread__name(self->thread, bf, sizeof(bf)),
                       self->level, (unsigned long long)self->ip);

        if (self->level != '.')
                ret += fprintf(fp, "%s\n",
                               self->sym ? self->sym->name : "<unknown>");
        else
                ret += fprintf(fp, "%s: %s\n",
                               self->dso ? self->dso->name : "<unknown>",
                               self->sym ? self->sym->name : "<unknown>");
        return ret;
}

struct thread {
        struct rb_node   rb_node;
        struct list_head maps;
        struct rb_root   symhists;
        pid_t            pid;
        char             *comm;
};

static const char *thread__name(struct thread *self, char *bf, size_t size)
{
        if (self->comm)
                return self->comm;

        snprintf(bf, sizeof(bf), ":%u", self->pid);
        return bf;
}

static struct thread *thread__new(pid_t pid)
{
        struct thread *self = malloc(sizeof(*self));

        if (self != NULL) {
                self->pid = pid;
                self->comm = NULL;
                INIT_LIST_HEAD(&self->maps);
                self->symhists = RB_ROOT;
        }

        return self;
}

static int thread__symbol_incnew(struct thread *self, struct symbol *sym,
                                 uint64_t ip, struct dso *dso, char level)
{
        struct rb_node **p = &self->symhists.rb_node;
        struct rb_node *parent = NULL;
        struct symhist *sh;

        while (*p != NULL) {
                parent = *p;
                sh = rb_entry(parent, struct symhist, rb_node);

                if (sh->sym == sym || ip == sh->ip) {
                        symhist__inc(sh);
                        return 0;
                }

                /* Handle unresolved symbols too */
                const uint64_t start = !sh->sym ? sh->ip : sh->sym->start;

                if (ip < start)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }

        sh = symhist__new(sym, ip, self, dso, level);
        if (sh == NULL)
                return -ENOMEM;
        rb_link_node(&sh->rb_node, parent, p);
        rb_insert_color(&sh->rb_node, &self->symhists);
        return 0;
}

static int thread__set_comm(struct thread *self, const char *comm)
{
        self->comm = strdup(comm);
        return self->comm ? 0 : -ENOMEM;
}

size_t thread__maps_fprintf(struct thread *self, FILE *fp)
{
        struct map *pos;
        size_t ret = 0;

        list_for_each_entry(pos, &self->maps, node)
                ret += map__fprintf(pos, fp);

        return ret;
}

static size_t thread__fprintf(struct thread *self, FILE *fp)
{
        int ret = fprintf(fp, "thread: %d %s\n", self->pid, self->comm);
        struct rb_node *nd;

        for (nd = rb_first(&self->symhists); nd; nd = rb_next(nd)) {
                struct symhist *pos = rb_entry(nd, struct symhist, rb_node);
                ret += symhist__fprintf(pos, 0, fp);
        }

        return ret;
}

static struct rb_root threads = RB_ROOT;

static struct thread *threads__findnew(pid_t pid)
{
        struct rb_node **p = &threads.rb_node;
        struct rb_node *parent = NULL;
        struct thread *th;

        while (*p != NULL) {
                parent = *p;
                th = rb_entry(parent, struct thread, rb_node);

                if (th->pid == pid)
                        return th;

                if (pid < th->pid)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }

        th = thread__new(pid);
        if (th != NULL) {
                rb_link_node(&th->rb_node, parent, p);
                rb_insert_color(&th->rb_node, &threads);
        }
        return th;
}

static void thread__insert_map(struct thread *self, struct map *map)
{
        list_add_tail(&map->node, &self->maps);
}

static struct map *thread__find_map(struct thread *self, uint64_t ip)
{
        if (self == NULL)
                return NULL;

        struct map *pos;

        list_for_each_entry(pos, &self->maps, node)
                if (ip >= pos->start && ip <= pos->end)
                        return pos;

        return NULL;
}

void threads__fprintf(FILE *fp)
{
        struct rb_node *nd;
        for (nd = rb_first(&threads); nd; nd = rb_next(nd)) {
                struct thread *pos = rb_entry(nd, struct thread, rb_node);
                thread__fprintf(pos, fp);
        }
}

static struct rb_root global_symhists = RB_ROOT;

static void threads__insert_symhist(struct symhist *sh)
{
        struct rb_node **p = &global_symhists.rb_node;
        struct rb_node *parent = NULL;
        struct symhist *iter;

        while (*p != NULL) {
                parent = *p;
                iter = rb_entry(parent, struct symhist, rb_node);

                /* Reverse order */
                if (sh->count > iter->count)
                        p = &(*p)->rb_left;
                else
                        p = &(*p)->rb_right;
        }

        rb_link_node(&sh->rb_node, parent, p);
        rb_insert_color(&sh->rb_node, &global_symhists);
}

static void threads__sort_symhists(void)
{
        struct rb_node *nd;

        for (nd = rb_first(&threads); nd; nd = rb_next(nd)) {
                struct thread *thread = rb_entry(nd, struct thread, rb_node);
                struct rb_node *next = rb_first(&thread->symhists);

                while (next) {
                        struct symhist *n = rb_entry(next, struct symhist,
                                                     rb_node);
                        next = rb_next(&n->rb_node);
                        rb_erase(&n->rb_node, &thread->symhists);
                        threads__insert_symhist(n);
                }

        }
}

static size_t threads__symhists_fprintf(uint64_t total_samples, FILE *fp)
{
        struct rb_node *nd;
        size_t ret = 0;

        for (nd = rb_first(&global_symhists); nd; nd = rb_next(nd)) {
                struct symhist *pos = rb_entry(nd, struct symhist, rb_node);
                ret += symhist__fprintf(pos, total_samples, fp);
        }

        return ret;
}

static int __cmd_report(void)
{
        unsigned long offset = 0;
        unsigned long head = 0;
        struct stat stat;
        char *buf;
        event_t *event;
        int ret, rc = EXIT_FAILURE;
        uint32_t size;
        unsigned long total = 0, total_mmap = 0, total_comm = 0, total_unknown = 0;

        input = open(input_name, O_RDONLY);
        if (input < 0) {
                perror("failed to open file");
                exit(-1);
        }

        ret = fstat(input, &stat);
        if (ret < 0) {
                perror("failed to stat file");
                exit(-1);
        }

        if (!stat.st_size) {
                fprintf(stderr, "zero-sized file, nothing to do!\n");
                exit(0);
        }

        if (load_kallsyms() < 0) {
                perror("failed to open kallsyms");
                return EXIT_FAILURE;
        }

remap:
        buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
                           MAP_SHARED, input, offset);
        if (buf == MAP_FAILED) {
                perror("failed to mmap file");
                exit(-1);
        }

more:
        event = (event_t *)(buf + head);

        size = event->header.size;
        if (!size)
                size = 8;

        if (head + event->header.size >= page_size * mmap_window) {
                unsigned long shift = page_size * (head / page_size);
                int ret;

                ret = munmap(buf, page_size * mmap_window);
                assert(ret == 0);

                offset += shift;
                head -= shift;
                goto remap;
        }

        size = event->header.size;
        if (!size)
                goto broken_event;

        if (event->header.misc & PERF_EVENT_MISC_OVERFLOW) {
                char level;
                int show = 0;
                struct dso *dso = NULL;
                struct thread *thread = threads__findnew(event->ip.pid);
                uint64_t ip = event->ip.ip;

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT (IP, %d): %d: %p\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                event->header.misc,
                                event->ip.pid,
                                (void *)event->ip.ip);
                }

                if (thread == NULL) {
                        fprintf(stderr, "problem processing %d event, bailing out\n",
                                event->header.type);
                        goto done;
                }

                if (event->header.misc & PERF_EVENT_MISC_KERNEL) {
                        show = SHOW_KERNEL;
                        level = 'k';
                        dso = kernel_dso;
                } else if (event->header.misc & PERF_EVENT_MISC_USER) {
                        show = SHOW_USER;
                        level = '.';
                        struct map *map = thread__find_map(thread, ip);
                        if (map != NULL) {
                                dso = map->dso;
                                ip -= map->start + map->pgoff;
                        }
                } else {
                        show = SHOW_HV;
                        level = 'H';
                }

                if (show & show_mask) {
                        struct symbol *sym = dso__find_symbol(dso, ip);

                        if (thread__symbol_incnew(thread, sym, ip, dso, level)) {
                                fprintf(stderr, "problem incrementing symbol count, bailing out\n");
                                goto done;
                        }
                }
                total++;
        } else switch (event->header.type) {
        case PERF_EVENT_MMAP: {
                struct thread *thread = threads__findnew(event->mmap.pid);
                struct map *map = map__new(&event->mmap);

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT_MMAP: [%p(%p) @ %p]: %s\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                (void *)event->mmap.start,
                                (void *)event->mmap.len,
                                (void *)event->mmap.pgoff,
                                event->mmap.filename);
                }
                if (thread == NULL || map == NULL) {
                        fprintf(stderr, "problem processing PERF_EVENT_MMAP, bailing out\n");
                        goto done;
                }
                thread__insert_map(thread, map);
                total_mmap++;
                break;
        }
        case PERF_EVENT_COMM: {
                struct thread *thread = threads__findnew(event->comm.pid);

                if (dump_trace) {
                        fprintf(stderr, "%p [%p]: PERF_EVENT_COMM: %s:%d\n",
                                (void *)(offset + head),
                                (void *)(long)(event->header.size),
                                event->comm.comm, event->comm.pid);
                }
                if (thread == NULL ||
                    thread__set_comm(thread, event->comm.comm)) {
                        fprintf(stderr, "problem processing PERF_EVENT_COMM, bailing out\n");
                        goto done;
                }
                total_comm++;
                break;
        }
        default: {
broken_event:
                fprintf(stderr, "%p [%p]: skipping unknown header type: %d\n",
                        (void *)(offset + head),
                        (void *)(long)(event->header.size),
                        event->header.type);
                total_unknown++;

                /*
                 * assume we lost track of the stream, check alignment, and
                 * increment a single u64 in the hope to catch on again 'soon'.
                 */

                if (unlikely(head & 7))
                        head &= ~7ULL;

                size = 8;
        }
        }

        head += size;

        if (offset + head < stat.st_size)
                goto more;

        rc = EXIT_SUCCESS;
done:
        close(input);

        if (dump_trace) {
                fprintf(stderr, "      IP events: %10ld\n", total);
                fprintf(stderr, "    mmap events: %10ld\n", total_mmap);
                fprintf(stderr, "    comm events: %10ld\n", total_comm);
                fprintf(stderr, " unknown events: %10ld\n", total_unknown);

                return 0;
        }

        threads__sort_symhists();
        threads__symhists_fprintf(total, stdout);

        return rc;
}

static const char * const report_usage[] = {
        "perf report [<options>] <command>",
        NULL
};

static const struct option options[] = {
        OPT_STRING('i', "input", &input_name, "file",
                    "input file name"),
        OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
                    "dump raw trace in ASCII"),
        OPT_END()
};

int cmd_report(int argc, const char **argv, const char *prefix)
{
        elf_version(EV_CURRENT);

        page_size = getpagesize();

        parse_options(argc, argv, options, report_usage, 0);

        return __cmd_report();
}