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>
  26 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
  27 static const char **syscalltbl_native = syscalltbl_x86_64;
  28 #endif
  29
  30 struct syscall {
  31         int id;
  32         const char *name;
  33 };
  34
  35 static 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
  43 static 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
  50 static 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
  76 struct 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
  88 void syscalltbl__delete(struct syscalltbl *tbl)
  89 {
  90         zfree(&tbl->syscalls.entries);
  91         free(tbl);
  92 }
  93
  94 const 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
  99 int 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
 112 struct 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
 120 void syscalltbl__delete(struct syscalltbl *tbl)
 121 {
 122         free(tbl);
 123 }
 124
 125 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 126 {
 127         return audit_syscall_to_name(id, tbl->audit_machine);
 128 }
 129
 130 int 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 */