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 <[email protected]>
   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 #elif defined(__loongarch__)
  42 #include <asm/syscalls.c>
  43 const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
  44 static const char **syscalltbl_native = syscalltbl_loongarch;
  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         tbl->syscalls.max_id     = syscalltbl_native_max_id;
  91         return 0;
  92 }
  93
  94 struct syscalltbl *syscalltbl__new(void)
  95 {
  96         struct syscalltbl *tbl = malloc(sizeof(*tbl));
  97         if (tbl) {
  98                 if (syscalltbl__init_native(tbl)) {
  99                         free(tbl);
 100                         return NULL;
 101                 }
 102         }
 103         return tbl;
 104 }
 105
 106 void syscalltbl__delete(struct syscalltbl *tbl)
 107 {
 108         zfree(&tbl->syscalls.entries);
 109         free(tbl);
 110 }
 111
 112 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
 113 {
 114         return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
 115 }
 116
 117 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 118 {
 119         struct syscall *sc = bsearch(name, tbl->syscalls.entries,
 120                                      tbl->syscalls.nr_entries, sizeof(*sc),
 121                                      syscallcmpname);
 122
 123         return sc ? sc->id : -1;
 124 }
 125
 126 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 127 {
 128         int i;
 129         struct syscall *syscalls = tbl->syscalls.entries;
 130
 131         for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
 132                 if (strglobmatch(syscalls[i].name, syscall_glob)) {
 133                         *idx = i;
 134                         return syscalls[i].id;
 135                 }
 136         }
 137
 138         return -1;
 139 }
 140
 141 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 142 {
 143         *idx = -1;
 144         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 145 }
 146
 147 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
 148
 149 #include <libaudit.h>
 150
 151 struct syscalltbl *syscalltbl__new(void)
 152 {
 153         struct syscalltbl *tbl = zalloc(sizeof(*tbl));
 154         if (tbl)
 155                 tbl->audit_machine = audit_detect_machine();
 156         return tbl;
 157 }
 158
 159 void syscalltbl__delete(struct syscalltbl *tbl)
 160 {
 161         free(tbl);
 162 }
 163
 164 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
 165 {
 166         return audit_syscall_to_name(id, tbl->audit_machine);
 167 }
 168
 169 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
 170 {
 171         return audit_name_to_syscall(name, tbl->audit_machine);
 172 }
 173
 174 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
 175                                   const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
 176 {
 177         return -1;
 178 }
 179
 180 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
 181 {
 182         return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
 183 }
 184 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */