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 #include <linux/compiler.h>
  19
  20 #ifdef HAVE_SYSCALL_TABLE
  21 #include <string.h>
  22 #include "string2.h"
  23 #include "util.h"
  24
  25 #if defined(__x86_64__)
  26 #include <asm/syscalls_64.c>
  27 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
  28 static const char **syscalltbl_native = syscalltbl_x86_64;
  29 #elif defined(__s390x__)
  30 #include <asm/syscalls_64.c>
  31 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
  32 static const char **syscalltbl_native = syscalltbl_s390_64;
  33 #endif
  34
  35 struct syscall {
  36         int id;
  37         const char *name;
  38 };
  39
  40 static int syscallcmpname(const void *vkey, const void *ventry)
  41 {
  42         const char *key = vkey;
  43         const struct syscall *entry = ventry;
  44
  45         return strcmp(key, entry->name);
  46 }
  47
  48 static int syscallcmp(const void *va, const void *vb)
  49 {
  50         const struct syscall *a = va, *b = vb;
  51
  52         return strcmp(a->name, b->name);
  53 }
  54
  55 static int syscalltbl__init_native(struct syscalltbl *tbl)
  56 {
  57         int nr_entries = 0, i, j;
  58         struct syscall *entries;
  59
  60         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  61                 if (syscalltbl_native[i])
  62                         ++nr_entries;
  63
  64         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  65         if (tbl->syscalls.entries == NULL)
  66                 return -1;
  67
  68         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  69                 if (syscalltbl_native[i]) {
  70                         entries[j].name = syscalltbl_native[i];
  71                         entries[j].id = i;
  72                         ++j;
  73                 }
  74         }
  75
  76         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  77         tbl->syscalls.nr_entries = nr_entries;
  78         return 0;
  79 }
  80
  81 struct syscalltbl *syscalltbl__new(void)
  82 {
  83         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  84         if (tbl) {
  85                 if (syscalltbl__init_native(tbl)) {
  86                         free(tbl);
  87                         return NULL;
  88                 }
  89         }
  90         return tbl;
  91 }
  92
  93 void syscalltbl__delete(struct syscalltbl *tbl)
  94 {
  95         zfree(&tbl->syscalls.entries);
  96         free(tbl);
  97 }
  98
  99 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 100 {
 101         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 102 }
 103
 104 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 105 {
 106         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 107                                      tbl->syscalls.nr_entries, sizeof(*sc),
 108                                      syscallcmpname);
 109
 110         return sc ? sc->id : -1;
 111 }
 112
 113 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 114 {
 115         int i;
 116         struct syscall *syscalls = tbl->syscalls.entries;
 117
 118         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 119                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 120                         *idx = i;
 121                         return syscalls[i].id;
 122                 }
 123         }
 124
 125         return -1;
 126 }
 127
 128 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 129 {
 130         *idx = -1;
 131         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 132 }
 133
 134 #else /* HAVE_SYSCALL_TABLE */
 135
 136 #include <libaudit.h>
 137
 138 struct syscalltbl *syscalltbl__new(void)
 139 {
 140         struct syscalltbl *tbl = malloc(sizeof(*tbl));
 141         if (tbl)
 142                 tbl->audit_machine = audit_detect_machine();
 143         return tbl;
 144 }
 145
 146 void syscalltbl__delete(struct syscalltbl *tbl)
 147 {
 148         free(tbl);
 149 }
 150
 151 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 152 {
 153         return audit_syscall_to_name(id, tbl->audit_machine);
 154 }
 155
 156 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 157 {
 158         return audit_name_to_syscall(name, tbl->audit_machine);
 159 }
 160
 161 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 162                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 163 {
 164         return -1;
 165 }
 166
 167 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 168 {
 169         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 170 }
 171 #endif /* HAVE_SYSCALL_TABLE */