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