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 #include <linux/zalloc.h>
  12
  13 #ifdef HAVE_SYSCALL_TABLE_SUPPORT
  14 #include <string.h>
  15 #include "string2.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         tbl->syscalls.max_id     = syscalltbl_native_max_id;
  83         return 0;
  84 }
  85
  86 struct syscalltbl *syscalltbl__new(void)
  87 {
  88         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  89         if (tbl) {
  90                 if (syscalltbl__init_native(tbl)) {
  91                         free(tbl);
  92                         return NULL;
  93                 }
  94         }
  95         return tbl;
  96 }
  97
  98 void syscalltbl__delete(struct syscalltbl *tbl)
  99 {
 100         zfree(&tbl->syscalls.entries);
 101         free(tbl);
 102 }
 103
 104 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 105 {
 106         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 107 }
 108
 109 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 110 {
 111         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 112                                      tbl->syscalls.nr_entries, sizeof(*sc),
 113                                      syscallcmpname);
 114
 115         return sc ? sc->id : -1;
 116 }
 117
 118 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 119 {
 120         int i;
 121         struct syscall *syscalls = tbl->syscalls.entries;
 122
 123         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 124                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 125                         *idx = i;
 126                         return syscalls[i].id;
 127                 }
 128         }
 129
 130         return -1;
 131 }
 132
 133 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 134 {
 135         *idx = -1;
 136         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 137 }
 138
 139 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
 140
 141 #include <libaudit.h>
 142
 143 struct syscalltbl *syscalltbl__new(void)
 144 {
 145         struct syscalltbl *tbl = zalloc(sizeof(*tbl));
 146         if (tbl)
 147                 tbl->audit_machine = audit_detect_machine();
 148         return tbl;
 149 }
 150
 151 void syscalltbl__delete(struct syscalltbl *tbl)
 152 {
 153         free(tbl);
 154 }
 155
 156 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 157 {
 158         return audit_syscall_to_name(id, tbl->audit_machine);
 159 }
 160
 161 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 162 {
 163         return audit_name_to_syscall(name, tbl->audit_machine);
 164 }
 165
 166 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 167                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 168 {
 169         return -1;
 170 }
 171
 172 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 173 {
 174         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 175 }
 176 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */