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 #elif defined(__mips__)
  38 #include <asm/syscalls_n64.c>
  39 const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
  40 static const char **syscalltbl_native = syscalltbl_mips_n64;
  41 #endif
  42
  43 struct syscall {
  44         int id;
  45         const char *name;
  46 };
  47
  48 static int syscallcmpname(const void *vkey, const void *ventry)
  49 {
  50         const char *key = vkey;
  51         const struct syscall *entry = ventry;
  52
  53         return strcmp(key, entry->name);
  54 }
  55
  56 static int syscallcmp(const void *va, const void *vb)
  57 {
  58         const struct syscall *a = va, *b = vb;
  59
  60         return strcmp(a->name, b->name);
  61 }
  62
  63 static int syscalltbl__init_native(struct syscalltbl *tbl)
  64 {
  65         int nr_entries = 0, i, j;
  66         struct syscall *entries;
  67
  68         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  69                 if (syscalltbl_native[i])
  70                         ++nr_entries;
  71
  72         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  73         if (tbl->syscalls.entries == NULL)
  74                 return -1;
  75
  76         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  77                 if (syscalltbl_native[i]) {
  78                         entries[j].name = syscalltbl_native[i];
  79                         entries[j].id = i;
  80                         ++j;
  81                 }
  82         }
  83
  84         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  85         tbl->syscalls.nr_entries = nr_entries;
  86         tbl->syscalls.max_id     = syscalltbl_native_max_id;
  87         return 0;
  88 }
  89
  90 struct syscalltbl *syscalltbl__new(void)
  91 {
  92         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  93         if (tbl) {
  94                 if (syscalltbl__init_native(tbl)) {
  95                         free(tbl);
  96                         return NULL;
  97                 }
  98         }
  99         return tbl;
 100 }
 101
 102 void syscalltbl__delete(struct syscalltbl *tbl)
 103 {
 104         zfree(&tbl->syscalls.entries);
 105         free(tbl);
 106 }
 107
 108 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 109 {
 110         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 111 }
 112
 113 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 114 {
 115         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 116                                      tbl->syscalls.nr_entries, sizeof(*sc),
 117                                      syscallcmpname);
 118
 119         return sc ? sc->id : -1;
 120 }
 121
 122 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 123 {
 124         int i;
 125         struct syscall *syscalls = tbl->syscalls.entries;
 126
 127         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 128                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 129                         *idx = i;
 130                         return syscalls[i].id;
 131                 }
 132         }
 133
 134         return -1;
 135 }
 136
 137 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 138 {
 139         *idx = -1;
 140         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 141 }
 142
 143 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
 144
 145 #include <libaudit.h>
 146
 147 struct syscalltbl *syscalltbl__new(void)
 148 {
 149         struct syscalltbl *tbl = zalloc(sizeof(*tbl));
 150         if (tbl)
 151                 tbl->audit_machine = audit_detect_machine();
 152         return tbl;
 153 }
 154
 155 void syscalltbl__delete(struct syscalltbl *tbl)
 156 {
 157         free(tbl);
 158 }
 159
 160 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 161 {
 162         return audit_syscall_to_name(id, tbl->audit_machine);
 163 }
 164
 165 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 166 {
 167         return audit_name_to_syscall(name, tbl->audit_machine);
 168 }
 169
 170 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 171                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 172 {
 173         return -1;
 174 }
 175
 176 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 177 {
 178         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 179 }
 180 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */