tools/perf/util/syscalltbl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * System call table mapper
   4  *
   5  * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
   6  */
   7
   8 #include "syscalltbl.h"
   9 #include <stdlib.h>
  10 #include <linux/compiler.h>
  11
  12 #ifdef HAVE_SYSCALL_TABLE_SUPPORT
  13 #include <string.h>
  14 #include "string2.h"
  15 #include "util.h"
  16
  17 #if defined(__x86_64__)
  18 #include <asm/syscalls_64.c>
  19 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
  20 static const char **syscalltbl_native = syscalltbl_x86_64;
  21 #elif defined(__s390x__)
  22 #include <asm/syscalls_64.c>
  23 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
  24 static const char **syscalltbl_native = syscalltbl_s390_64;
  25 #elif defined(__powerpc64__)
  26 #include <asm/syscalls_64.c>
  27 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
  28 static const char **syscalltbl_native = syscalltbl_powerpc_64;
  29 #elif defined(__powerpc__)
  30 #include <asm/syscalls_32.c>
  31 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
  32 static const char **syscalltbl_native = syscalltbl_powerpc_32;
  33 #elif defined(__aarch64__)
  34 #include <asm/syscalls.c>
  35 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
  36 static const char **syscalltbl_native = syscalltbl_arm64;
  37 #endif
  38
  39 struct syscall {
  40         int id;
  41         const char *name;
  42 };
  43
  44 static int syscallcmpname(const void *vkey, const void *ventry)
  45 {
  46         const char *key = vkey;
  47         const struct syscall *entry = ventry;
  48
  49         return strcmp(key, entry->name);
  50 }
  51
  52 static int syscallcmp(const void *va, const void *vb)
  53 {
  54         const struct syscall *a = va, *b = vb;
  55
  56         return strcmp(a->name, b->name);
  57 }
  58
  59 static int syscalltbl__init_native(struct syscalltbl *tbl)
  60 {
  61         int nr_entries = 0, i, j;
  62         struct syscall *entries;
  63
  64         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  65                 if (syscalltbl_native[i])
  66                         ++nr_entries;
  67
  68         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  69         if (tbl->syscalls.entries == NULL)
  70                 return -1;
  71
  72         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  73                 if (syscalltbl_native[i]) {
  74                         entries[j].name = syscalltbl_native[i];
  75                         entries[j].id = i;
  76                         ++j;
  77                 }
  78         }
  79
  80         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  81         tbl->syscalls.nr_entries = nr_entries;
  82         return 0;
  83 }
  84
  85 struct syscalltbl *syscalltbl__new(void)
  86 {
  87         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  88         if (tbl) {
  89                 if (syscalltbl__init_native(tbl)) {
  90                         free(tbl);
  91                         return NULL;
  92                 }
  93         }
  94         return tbl;
  95 }
  96
  97 void syscalltbl__delete(struct syscalltbl *tbl)
  98 {
  99         zfree(&tbl->syscalls.entries);
 100         free(tbl);
 101 }
 102
 103 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 104 {
 105         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 106 }
 107
 108 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 109 {
 110         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 111                                      tbl->syscalls.nr_entries, sizeof(*sc),
 112                                      syscallcmpname);
 113
 114         return sc ? sc->id : -1;
 115 }
 116
 117 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 118 {
 119         int i;
 120         struct syscall *syscalls = tbl->syscalls.entries;
 121
 122         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 123                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 124                         *idx = i;
 125                         return syscalls[i].id;
 126                 }
 127         }
 128
 129         return -1;
 130 }
 131
 132 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 133 {
 134         *idx = -1;
 135         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 136 }
 137
 138 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
 139
 140 #include <libaudit.h>
 141
 142 struct syscalltbl *syscalltbl__new(void)
 143 {
 144         struct syscalltbl *tbl = malloc(sizeof(*tbl));
 145         if (tbl)
 146                 tbl->audit_machine = audit_detect_machine();
 147         return tbl;
 148 }
 149
 150 void syscalltbl__delete(struct syscalltbl *tbl)
 151 {
 152         free(tbl);
 153 }
 154
 155 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 156 {
 157         return audit_syscall_to_name(id, tbl->audit_machine);
 158 }
 159
 160 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 161 {
 162         return audit_name_to_syscall(name, tbl->audit_machine);
 163 }
 164
 165 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 166                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 167 {
 168         return -1;
 169 }
 170
 171 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 172 {
 173         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 174 }
 175 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */