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 #include <string.h>
  14 #include "string2.h"
  15
  16 #include <syscall_table.h>
  17 const int syscalltbl_native_max_id = SYSCALLTBL_MAX_ID;
  18 static const char *const *syscalltbl_native = syscalltbl;
  19
  20 struct syscall {
  21         int id;
  22         const char *name;
  23 };
  24
  25 static int syscallcmpname(const void *vkey, const void *ventry)
  26 {
  27         const char *key = vkey;
  28         const struct syscall *entry = ventry;
  29
  30         return strcmp(key, entry->name);
  31 }
  32
  33 static int syscallcmp(const void *va, const void *vb)
  34 {
  35         const struct syscall *a = va, *b = vb;
  36
  37         return strcmp(a->name, b->name);
  38 }
  39
  40 static int syscalltbl__init_native(struct syscalltbl *tbl)
  41 {
  42         int nr_entries = 0, i, j;
  43         struct syscall *entries;
  44
  45         for (i = 0; i <= syscalltbl_native_max_id; ++i)
  46                 if (syscalltbl_native[i])
  47                         ++nr_entries;
  48
  49         entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
  50         if (tbl->syscalls.entries == NULL)
  51                 return -1;
  52
  53         for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
  54                 if (syscalltbl_native[i]) {
  55                         entries[j].name = syscalltbl_native[i];
  56                         entries[j].id = i;
  57                         ++j;
  58                 }
  59         }
  60
  61         qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
  62         tbl->syscalls.nr_entries = nr_entries;
  63         tbl->syscalls.max_id     = syscalltbl_native_max_id;
  64         return 0;
  65 }
  66
  67 struct syscalltbl *syscalltbl__new(void)
  68 {
  69         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  70         if (tbl) {
  71                 if (syscalltbl__init_native(tbl)) {
  72                         free(tbl);
  73                         return NULL;
  74                 }
  75         }
  76         return tbl;
  77 }
  78
  79 void syscalltbl__delete(struct syscalltbl *tbl)
  80 {
  81         zfree(&tbl->syscalls.entries);
  82         free(tbl);
  83 }
  84
  85 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
  86 {
  87         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
  88 }
  89
  90 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
  91 {
  92         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
  93                                      tbl->syscalls.nr_entries, sizeof(*sc),
  94                                      syscallcmpname);
  95
  96         return sc ? sc->id : -1;
  97 }
  98
  99 int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
 100 {
 101         struct syscall *syscalls = tbl->syscalls.entries;
 102
 103         return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
 104 }
 105
 106 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 107 {
 108         int i;
 109         struct syscall *syscalls = tbl->syscalls.entries;
 110
 111         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 112                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 113                         *idx = i;
 114                         return syscalls[i].id;
 115                 }
 116         }
 117
 118         return -1;
 119 }
 120
 121 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 122 {
 123         *idx = -1;
 124         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 125 }