LXR linux/tools/perf/util/syscalltbl.c

   1/*
   2 * System call table mapper
   3 *
   4 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 */
  15
  16#include "syscalltbl.h"
  17#include <stdlib.h>
  18
  19#ifdef HAVE_SYSCALL_TABLE
  20#include <linux/compiler.h>
  21#include <string.h>
  22#include "util.h"
  23
  24#if defined(__x86_64__)
  25#include <asm/syscalls_64.c>
  26const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
  27static const char **syscalltbl_native = syscalltbl_x86_64;
  28#endif
  29
  30struct syscall {
  31        int id;
  32        const char *name;
  33};
  34
  35static int syscallcmpname(const void *vkey, const void *ventry)
  36{
  37        const char *key = vkey;
  38        const struct syscall *entry = ventry;
  39
  40        return strcmp(key, entry->name);
  41}
  42
  43static int syscallcmp(const void *va, const void *vb)
  44{
  45        const struct syscall *a = va, *b = vb;
  46
  47        return strcmp(a->name, b->name);
  48}
  49
  50static int syscalltbl__init_native(struct syscalltbl *tbl)
  51{
  52        int nr_entries = 0, i, j;
  53        struct syscall *entries;
  54
  55        for (i = 0; i <= syscalltbl_native_max_id; ++i)
  56                if (syscalltbl_native[i])
  57                        ++nr_entries;
  58
  59        entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  60        if (tbl->syscalls.entries == NULL)
  61                return -1;
  62
  63        for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  64                if (syscalltbl_native[i]) {
  65                        entries[j].name = syscalltbl_native[i];
  66                        entries[j].id = i;
  67                        ++j;
  68                }
  69        }
  70
  71        qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  72        tbl->syscalls.nr_entries = nr_entries;
  73        return 0;
  74}
  75
  76struct syscalltbl *syscalltbl__new(void)
  77{
  78        struct syscalltbl *tbl = malloc(sizeof(*tbl));
  79        if (tbl) {
  80                if (syscalltbl__init_native(tbl)) {
  81                        free(tbl);
  82                        return NULL;
  83                }
  84        }
  85        return tbl;
  86}
  87
  88void syscalltbl__delete(struct syscalltbl *tbl)
  89{
  90        zfree(&tbl->syscalls.entries);
  91        free(tbl);
  92}
  93
  94const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
  95{
  96        return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
  97}
  98
  99int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 100{
 101        struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 102                                     tbl->syscalls.nr_entries, sizeof(*sc),
 103                                     syscallcmpname);
 104
 105        return sc ? sc->id : -1;
 106}
 107
 108#else /* HAVE_SYSCALL_TABLE */
 109
 110#include <libaudit.h>
 111
 112struct syscalltbl *syscalltbl__new(void)
 113{
 114        struct syscalltbl *tbl = malloc(sizeof(*tbl));
 115        if (tbl)
 116                tbl->audit_machine = audit_detect_machine();
 117        return tbl;
 118}
 119
 120void syscalltbl__delete(struct syscalltbl *tbl)
 121{
 122        free(tbl);
 123}
 124
 125const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 126{
 127        return audit_syscall_to_name(id, tbl->audit_machine);
 128}
 129
 130int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 131{
 132        return audit_name_to_syscall(name, tbl->audit_machine);
 133}
 134#endif /* HAVE_SYSCALL_TABLE */
 135