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_SUPPORT
  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 #elif defined(__powerpc64__)
  34 #include <asm/syscalls_64.c>
  35 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
  36 static const char **syscalltbl_native = syscalltbl_powerpc_64;
  37 #elif defined(__powerpc__)
  38 #include <asm/syscalls_32.c>
  39 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
  40 static const char **syscalltbl_native = syscalltbl_powerpc_32;
  41 #elif defined(__aarch64__)
  42 #include <asm/syscalls.c>
  43 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
  44 static const char **syscalltbl_native = syscalltbl_arm64;
  45 #endif
  46
  47 struct syscall {
  48         int id;
  49         const char *name;
  50 };
  51
  52 static int syscallcmpname(const void *vkey, const void *ventry)
  53 {
  54         const char *key = vkey;
  55         const struct syscall *entry = ventry;
  56
  57         return strcmp(key, entry->name);
  58 }
  59
  60 static int syscallcmp(const void *va, const void *vb)
  61 {
  62         const struct syscall *a = va, *b = vb;
  63
  64         return strcmp(a->name, b->name);
  65 }
  66
  67 static int syscalltbl__init_native(struct syscalltbl *tbl)
  68 {
  69         int nr_entries = 0, i, j;
  70         struct syscall *entries;
  71
  72         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  73                 if (syscalltbl_native[i])
  74                         ++nr_entries;
  75
  76         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  77         if (tbl->syscalls.entries == NULL)
  78                 return -1;
  79
  80         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  81                 if (syscalltbl_native[i]) {
  82                         entries[j].name = syscalltbl_native[i];
  83                         entries[j].id = i;
  84                         ++j;
  85                 }
  86         }
  87
  88         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  89         tbl->syscalls.nr_entries = nr_entries;
  90         return 0;
  91 }
  92
  93 struct syscalltbl *syscalltbl__new(void)
  94 {
  95         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  96         if (tbl) {
  97                 if (syscalltbl__init_native(tbl)) {
  98                         free(tbl);
  99                         return NULL;
 100                 }
 101         }
 102         return tbl;
 103 }
 104
 105 void syscalltbl__delete(struct syscalltbl *tbl)
 106 {
 107         zfree(&tbl->syscalls.entries);
 108         free(tbl);
 109 }
 110
 111 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 112 {
 113         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 114 }
 115
 116 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 117 {
 118         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 119                                      tbl->syscalls.nr_entries, sizeof(*sc),
 120                                      syscallcmpname);
 121
 122         return sc ? sc->id : -1;
 123 }
 124
 125 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 126 {
 127         int i;
 128         struct syscall *syscalls = tbl->syscalls.entries;
 129
 130         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 131                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 132                         *idx = i;
 133                         return syscalls[i].id;
 134                 }
 135         }
 136
 137         return -1;
 138 }
 139
 140 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 141 {
 142         *idx = -1;
 143         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 144 }
 145
 146 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
 147
 148 #include <libaudit.h>
 149
 150 struct syscalltbl *syscalltbl__new(void)
 151 {
 152         struct syscalltbl *tbl = malloc(sizeof(*tbl));
 153         if (tbl)
 154                 tbl->audit_machine = audit_detect_machine();
 155         return tbl;
 156 }
 157
 158 void syscalltbl__delete(struct syscalltbl *tbl)
 159 {
 160         free(tbl);
 161 }
 162
 163 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 164 {
 165         return audit_syscall_to_name(id, tbl->audit_machine);
 166 }
 167
 168 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 169 {
 170         return audit_name_to_syscall(name, tbl->audit_machine);
 171 }
 172
 173 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 174                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 175 {
 176         return -1;
 177 }
 178
 179 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 180 {
 181         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 182 }
 183 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */